File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/arch/um/.gitignore b/arch/um/.gitignore
new file mode 100644
index 0000000..a73d3a1
--- /dev/null
+++ b/arch/um/.gitignore
@@ -0,0 +1,3 @@
+kernel/config.c
+kernel/config.tmp
+kernel/vmlinux.lds
diff --git a/arch/um/Kconfig.char b/arch/um/Kconfig.char
new file mode 100644
index 0000000..f10738d
--- /dev/null
+++ b/arch/um/Kconfig.char
@@ -0,0 +1,123 @@
+menu "UML Character Devices"
+
+config STDERR_CONSOLE
+ bool "stderr console"
+ default y
+ help
+ console driver which dumps all printk messages to stderr.
+
+config SSL
+ bool "Virtual serial line"
+ help
+ The User-Mode Linux environment allows you to create virtual serial
+ lines on the UML that are usually made to show up on the host as
+ ttys or ptys.
+
+ See <http://user-mode-linux.sourceforge.net/old/input.html> for more
+ information and command line examples of how to use this facility.
+
+ Unless you have a specific reason for disabling this, say Y.
+
+config NULL_CHAN
+ bool "null channel support"
+ help
+ This option enables support for attaching UML consoles and serial
+ lines to a device similar to /dev/null. Data written to it disappears
+ and there is never any data to be read.
+
+config PORT_CHAN
+ bool "port channel support"
+ help
+ This option enables support for attaching UML consoles and serial
+ lines to host portals. They may be accessed with 'telnet <host>
+ <port number>'. Any number of consoles and serial lines may be
+ attached to a single portal, although what UML device you get when
+ you telnet to that portal will be unpredictable.
+ It is safe to say 'Y' here.
+
+config PTY_CHAN
+ bool "pty channel support"
+ help
+ This option enables support for attaching UML consoles and serial
+ lines to host pseudo-terminals. Access to both traditional
+ pseudo-terminals (/dev/pty*) and pts pseudo-terminals are controlled
+ with this option. The assignment of UML devices to host devices
+ will be announced in the kernel message log.
+ It is safe to say 'Y' here.
+
+config TTY_CHAN
+ bool "tty channel support"
+ help
+ This option enables support for attaching UML consoles and serial
+ lines to host terminals. Access to both virtual consoles
+ (/dev/tty*) and the slave side of pseudo-terminals (/dev/ttyp* and
+ /dev/pts/*) are controlled by this option.
+ It is safe to say 'Y' here.
+
+config XTERM_CHAN
+ bool "xterm channel support"
+ help
+ This option enables support for attaching UML consoles and serial
+ lines to xterms. Each UML device so assigned will be brought up in
+ its own xterm.
+ It is safe to say 'Y' here.
+
+config NOCONFIG_CHAN
+ bool
+ default !(XTERM_CHAN && TTY_CHAN && PTY_CHAN && PORT_CHAN && NULL_CHAN)
+
+config CON_ZERO_CHAN
+ string "Default main console channel initialization"
+ default "fd:0,fd:1"
+ help
+ This is the string describing the channel to which the main console
+ will be attached by default. This value can be overridden from the
+ command line. The default value is "fd:0,fd:1", which attaches the
+ main console to stdin and stdout.
+ It is safe to leave this unchanged.
+
+config CON_CHAN
+ string "Default console channel initialization"
+ default "xterm"
+ help
+ This is the string describing the channel to which all consoles
+ except the main console will be attached by default. This value can
+ be overridden from the command line. The default value is "xterm",
+ which brings them up in xterms.
+ It is safe to leave this unchanged, although you may wish to change
+ this if you expect the UML that you build to be run in environments
+ which don't have X or xterm available.
+
+config SSL_CHAN
+ string "Default serial line channel initialization"
+ default "pty"
+ help
+ This is the string describing the channel to which the serial lines
+ will be attached by default. This value can be overridden from the
+ command line. The default value is "pty", which attaches them to
+ traditional pseudo-terminals.
+ It is safe to leave this unchanged, although you may wish to change
+ this if you expect the UML that you build to be run in environments
+ which don't have a set of /dev/pty* devices.
+
+config UML_SOUND
+ tristate "Sound support"
+ help
+ This option enables UML sound support. If enabled, it will pull in
+ soundcore and the UML hostaudio relay, which acts as a intermediary
+ between the host's dsp and mixer devices and the UML sound system.
+ It is safe to say 'Y' here.
+
+config SOUND
+ tristate
+ default UML_SOUND
+
+config SOUND_OSS_CORE
+ bool
+ default UML_SOUND
+
+config HOSTAUDIO
+ tristate
+ default UML_SOUND
+
+endmenu
diff --git a/arch/um/Kconfig.common b/arch/um/Kconfig.common
new file mode 100644
index 0000000..d195a87
--- /dev/null
+++ b/arch/um/Kconfig.common
@@ -0,0 +1,61 @@
+config UML
+ bool
+ default y
+ select HAVE_ARCH_AUDITSYSCALL
+ select HAVE_UID16
+ select HAVE_FUTEX_CMPXCHG if FUTEX
+ select GENERIC_IRQ_SHOW
+ select GENERIC_CPU_DEVICES
+ select GENERIC_IO
+ select GENERIC_CLOCKEVENTS
+ select TTY # Needed for line.c
+
+config MMU
+ bool
+ default y
+
+config NO_IOMEM
+ def_bool y
+
+config ISA
+ bool
+
+config SBUS
+ bool
+
+config PCI
+ bool
+
+config PCMCIA
+ bool
+
+# Yet to do!
+config TRACE_IRQFLAGS_SUPPORT
+ bool
+ default n
+
+config LOCKDEP_SUPPORT
+ bool
+ default y
+
+config STACKTRACE_SUPPORT
+ bool
+ default y
+ select STACKTRACE
+
+config GENERIC_CALIBRATE_DELAY
+ bool
+ default y
+
+config GENERIC_BUG
+ bool
+ default y
+ depends on BUG
+
+config HZ
+ int
+ default 100
+
+config SUBARCH
+ string
+ option env="SUBARCH"
diff --git a/arch/um/Kconfig.debug b/arch/um/Kconfig.debug
new file mode 100644
index 0000000..68205fd
--- /dev/null
+++ b/arch/um/Kconfig.debug
@@ -0,0 +1,40 @@
+menu "Kernel hacking"
+
+source "lib/Kconfig.debug"
+
+config GPROF
+ bool "Enable gprof support"
+ depends on DEBUG_INFO && FRAME_POINTER
+ help
+ This allows profiling of a User-Mode Linux kernel with the gprof
+ utility.
+
+ See <http://user-mode-linux.sourceforge.net/old/gprof.html> for more
+ details.
+
+ If you're involved in UML kernel development and want to use gprof,
+ say Y. If you're unsure, say N.
+
+config GCOV
+ bool "Enable gcov support"
+ depends on DEBUG_INFO
+ help
+ This option allows developers to retrieve coverage data from a UML
+ session.
+
+ See <http://user-mode-linux.sourceforge.net/old/gprof.html> for more
+ details.
+
+ If you're involved in UML kernel development and want to use gcov,
+ say Y. If you're unsure, say N.
+
+config EARLY_PRINTK
+ bool "Early printk"
+ default y
+ ---help---
+ Write kernel log output directly to stdout.
+
+ This is useful for kernel debugging when your machine crashes very
+ early before the console code is initialized.
+
+endmenu
diff --git a/arch/um/Kconfig.net b/arch/um/Kconfig.net
new file mode 100644
index 0000000..820a56f
--- /dev/null
+++ b/arch/um/Kconfig.net
@@ -0,0 +1,202 @@
+
+menu "UML Network Devices"
+ depends on NET
+
+# UML virtual driver
+config UML_NET
+ bool "Virtual network device"
+ help
+ While the User-Mode port cannot directly talk to any physical
+ hardware devices, this choice and the following transport options
+ provide one or more virtual network devices through which the UML
+ kernels can talk to each other, the host, and with the host's help,
+ machines on the outside world.
+
+ For more information, including explanations of the networking and
+ sample configurations, see
+ <http://user-mode-linux.sourceforge.net/old/networking.html>.
+
+ If you'd like to be able to enable networking in the User-Mode
+ linux environment, say Y; otherwise say N. Note that you must
+ enable at least one of the following transport options to actually
+ make use of UML networking.
+
+config UML_NET_ETHERTAP
+ bool "Ethertap transport"
+ depends on UML_NET
+ help
+ The Ethertap User-Mode Linux network transport allows a single
+ running UML to exchange packets with its host over one of the
+ host's Ethertap devices, such as /dev/tap0. Additional running
+ UMLs can use additional Ethertap devices, one per running UML.
+ While the UML believes it's on a (multi-device, broadcast) virtual
+ Ethernet network, it's in fact communicating over a point-to-point
+ link with the host.
+
+ To use this, your host kernel must have support for Ethertap
+ devices. Also, if your host kernel is 2.4.x, it must have
+ CONFIG_NETLINK_DEV configured as Y or M.
+
+ For more information, see
+ <http://user-mode-linux.sourceforge.net/old/networking.html> That site
+ has examples of the UML command line to use to enable Ethertap
+ networking.
+
+ If you'd like to set up an IP network with the host and/or the
+ outside world, say Y to this, the Daemon Transport and/or the
+ Slip Transport. You'll need at least one of them, but may choose
+ more than one without conflict. If you don't need UML networking,
+ say N.
+
+config UML_NET_TUNTAP
+ bool "TUN/TAP transport"
+ depends on UML_NET
+ help
+ The UML TUN/TAP network transport allows a UML instance to exchange
+ packets with the host over a TUN/TAP device. This option will only
+ work with a 2.4 host, unless you've applied the TUN/TAP patch to
+ your 2.2 host kernel.
+
+ To use this transport, your host kernel must have support for TUN/TAP
+ devices, either built-in or as a module.
+
+config UML_NET_SLIP
+ bool "SLIP transport"
+ depends on UML_NET
+ help
+ The slip User-Mode Linux network transport allows a running UML to
+ network with its host over a point-to-point link. Unlike Ethertap,
+ which can carry any Ethernet frame (and hence even non-IP packets),
+ the slip transport can only carry IP packets.
+
+ To use this, your host must support slip devices.
+
+ For more information, see
+ <http://user-mode-linux.sourceforge.net/old/networking.html>.
+ has examples of the UML command line to use to enable slip
+ networking, and details of a few quirks with it.
+
+ The Ethertap Transport is preferred over slip because of its
+ limitations. If you prefer slip, however, say Y here. Otherwise
+ choose the Multicast transport (to network multiple UMLs on
+ multiple hosts), Ethertap (to network with the host and the
+ outside world), and/or the Daemon transport (to network multiple
+ UMLs on a single host). You may choose more than one without
+ conflict. If you don't need UML networking, say N.
+
+config UML_NET_DAEMON
+ bool "Daemon transport"
+ depends on UML_NET
+ help
+ This User-Mode Linux network transport allows one or more running
+ UMLs on a single host to communicate with each other, but not to
+ the host.
+
+ To use this form of networking, you'll need to run the UML
+ networking daemon on the host.
+
+ For more information, see
+ <http://user-mode-linux.sourceforge.net/old/networking.html> That site
+ has examples of the UML command line to use to enable Daemon
+ networking.
+
+ If you'd like to set up a network with other UMLs on a single host,
+ say Y. If you need a network between UMLs on multiple physical
+ hosts, choose the Multicast Transport. To set up a network with
+ the host and/or other IP machines, say Y to the Ethertap or Slip
+ transports. You'll need at least one of them, but may choose
+ more than one without conflict. If you don't need UML networking,
+ say N.
+
+config UML_NET_VDE
+ bool "VDE transport"
+ depends on UML_NET
+ help
+ This User-Mode Linux network transport allows one or more running
+ UMLs on a single host to communicate with each other and also
+ with the rest of the world using Virtual Distributed Ethernet,
+ an improved fork of uml_switch.
+
+ You must have libvdeplug installed in order to build the vde
+ transport into UML.
+
+ To use this form of networking, you will need to run vde_switch
+ on the host.
+
+ For more information, see <http://wiki.virtualsquare.org/>
+ That site has a good overview of what VDE is and also examples
+ of the UML command line to use to enable VDE networking.
+
+ If you need UML networking with VDE,
+ say Y.
+
+config UML_NET_MCAST
+ bool "Multicast transport"
+ depends on UML_NET
+ help
+ This Multicast User-Mode Linux network transport allows multiple
+ UMLs (even ones running on different host machines!) to talk to
+ each other over a virtual ethernet network. However, it requires
+ at least one UML with one of the other transports to act as a
+ bridge if any of them need to be able to talk to their hosts or any
+ other IP machines.
+
+ To use this, your host kernel(s) must support IP Multicasting.
+
+ For more information, see
+ <http://user-mode-linux.sourceforge.net/old/networking.html> That site
+ has examples of the UML command line to use to enable Multicast
+ networking, and notes about the security of this approach.
+
+ If you need UMLs on multiple physical hosts to communicate as if
+ they shared an Ethernet network, say Y. If you need to communicate
+ with other IP machines, make sure you select one of the other
+ transports (possibly in addition to Multicast; they're not
+ exclusive). If you don't need to network UMLs say N to each of
+ the transports.
+
+config UML_NET_PCAP
+ bool "pcap transport"
+ depends on UML_NET
+ help
+ The pcap transport makes a pcap packet stream on the host look
+ like an ethernet device inside UML. This is useful for making
+ UML act as a network monitor for the host. You must have libcap
+ installed in order to build the pcap transport into UML.
+
+ For more information, see
+ <http://user-mode-linux.sourceforge.net/old/networking.html> That site
+ has examples of the UML command line to use to enable this option.
+
+ If you intend to use UML as a network monitor for the host, say
+ Y here. Otherwise, say N.
+
+config UML_NET_SLIRP
+ bool "SLiRP transport"
+ depends on UML_NET
+ help
+ The SLiRP User-Mode Linux network transport allows a running UML
+ to network by invoking a program that can handle SLIP encapsulated
+ packets. This is commonly (but not limited to) the application
+ known as SLiRP, a program that can re-socket IP packets back onto
+ the host on which it is run. Only IP packets are supported,
+ unlike other network transports that can handle all Ethernet
+ frames. In general, slirp allows the UML the same IP connectivity
+ to the outside world that the host user is permitted, and unlike
+ other transports, SLiRP works without the need of root level
+ privleges, setuid binaries, or SLIP devices on the host. This
+ also means not every type of connection is possible, but most
+ situations can be accommodated with carefully crafted slirp
+ commands that can be passed along as part of the network device's
+ setup string. The effect of this transport on the UML is similar
+ that of a host behind a firewall that masquerades all network
+ connections passing through it (but is less secure).
+
+ To use this you should first have slirp compiled somewhere
+ accessible on the host, and have read its documentation. If you
+ don't need UML networking, say N.
+
+ Startup example: "eth0=slirp,FE:FD:01:02:03:04,/usr/local/bin/slirp"
+
+endmenu
+
diff --git a/arch/um/Kconfig.rest b/arch/um/Kconfig.rest
new file mode 100644
index 0000000..567eb5f
--- /dev/null
+++ b/arch/um/Kconfig.rest
@@ -0,0 +1,21 @@
+source "init/Kconfig"
+
+source "kernel/Kconfig.freezer"
+
+source "arch/um/Kconfig.char"
+
+source "drivers/Kconfig"
+
+source "net/Kconfig"
+
+source "arch/um/Kconfig.net"
+
+source "fs/Kconfig"
+
+source "security/Kconfig"
+
+source "crypto/Kconfig"
+
+source "lib/Kconfig"
+
+source "arch/um/Kconfig.debug"
diff --git a/arch/um/Kconfig.um b/arch/um/Kconfig.um
new file mode 100644
index 0000000..28a9885
--- /dev/null
+++ b/arch/um/Kconfig.um
@@ -0,0 +1,106 @@
+config STATIC_LINK
+ bool "Force a static link"
+ default n
+ help
+ This option gives you the ability to force a static link of UML.
+ Normally, UML is linked as a shared binary. This is inconvenient for
+ use in a chroot jail. So, if you intend to run UML inside a chroot,
+ you probably want to say Y here.
+ Additionally, this option enables using higher memory spaces (up to
+ 2.75G) for UML.
+
+source "mm/Kconfig"
+
+config LD_SCRIPT_STATIC
+ bool
+ default y
+ depends on STATIC_LINK
+
+config LD_SCRIPT_DYN
+ bool
+ default y
+ depends on !LD_SCRIPT_STATIC
+
+source "fs/Kconfig.binfmt"
+
+config HOSTFS
+ tristate "Host filesystem"
+ help
+ While the User-Mode Linux port uses its own root file system for
+ booting and normal file access, this module lets the UML user
+ access files stored on the host. It does not require any
+ network connection between the Host and UML. An example use of
+ this might be:
+
+ mount none /tmp/fromhost -t hostfs -o /tmp/umlshare
+
+ where /tmp/fromhost is an empty directory inside UML and
+ /tmp/umlshare is a directory on the host with files the UML user
+ wishes to access.
+
+ For more information, see
+ <http://user-mode-linux.sourceforge.net/hostfs.html>.
+
+ If you'd like to be able to work with files stored on the host,
+ say Y or M here; otherwise say N.
+
+config MCONSOLE
+ bool "Management console"
+ depends on PROC_FS
+ default y
+ help
+ The user mode linux management console is a low-level interface to
+ the kernel, somewhat like the i386 SysRq interface. Since there is
+ a full-blown operating system running under every user mode linux
+ instance, there is much greater flexibility possible than with the
+ SysRq mechanism.
+
+ If you answer 'Y' to this option, to use this feature, you need the
+ mconsole client (called uml_mconsole) which is present in CVS in
+ 2.4.5-9um and later (path /tools/mconsole), and is also in the
+ distribution RPM package in 2.4.6 and later.
+
+ It is safe to say 'Y' here.
+
+config MAGIC_SYSRQ
+ bool "Magic SysRq key"
+ depends on MCONSOLE
+ help
+ If you say Y here, you will have some control over the system even
+ if the system crashes for example during kernel debugging (e.g., you
+ will be able to flush the buffer cache to disk, reboot the system
+ immediately or dump some status information). A key for each of the
+ possible requests is provided.
+
+ This is the feature normally accomplished by pressing a key
+ while holding SysRq (Alt+PrintScreen).
+
+ On UML, this is accomplished by sending a "sysrq" command with
+ mconsole, followed by the letter for the requested command.
+
+ The keys are documented in <file:Documentation/sysrq.txt>. Don't say Y
+ unless you really know what this hack does.
+
+config KERNEL_STACK_ORDER
+ int "Kernel stack size order"
+ default 1 if 64BIT
+ range 1 10 if 64BIT
+ default 0 if !64BIT
+ help
+ This option determines the size of UML kernel stacks. They will
+ be 1 << order pages. The default is OK unless you're running Valgrind
+ on UML, in which case, set this to 3.
+
+config MMAPPER
+ tristate "iomem emulation driver"
+ help
+ This driver allows a host file to be used as emulated IO memory inside
+ UML.
+
+config NO_DMA
+ def_bool y
+
+config PGTABLE_LEVELS
+ int
+ default 3 if 3_LEVEL_PGTABLES
+ default 2
diff --git a/arch/um/Makefile b/arch/um/Makefile
new file mode 100644
index 0000000..e3abe6f
--- /dev/null
+++ b/arch/um/Makefile
@@ -0,0 +1,168 @@
+#
+# This file is included by the global makefile so that you can add your own
+# architecture-specific flags and dependencies.
+#
+# Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+# Licensed under the GPL
+#
+
+# select defconfig based on actual architecture
+ifeq ($(SUBARCH),x86)
+ ifeq ($(shell uname -m),x86_64)
+ KBUILD_DEFCONFIG := x86_64_defconfig
+ else
+ KBUILD_DEFCONFIG := i386_defconfig
+ endif
+else
+ KBUILD_DEFCONFIG := $(SUBARCH)_defconfig
+endif
+
+ARCH_DIR := arch/um
+OS := $(shell uname -s)
+# We require bash because the vmlinux link and loader script cpp use bash
+# features.
+SHELL := /bin/bash
+
+filechk_gen_header = $<
+
+core-y += $(ARCH_DIR)/kernel/ \
+ $(ARCH_DIR)/drivers/ \
+ $(ARCH_DIR)/os-$(OS)/
+
+MODE_INCLUDE += -I$(srctree)/$(ARCH_DIR)/include/shared/skas
+
+HEADER_ARCH := $(SUBARCH)
+
+ifneq ($(filter $(SUBARCH),x86 x86_64 i386),)
+ HEADER_ARCH := x86
+endif
+
+ifdef CONFIG_64BIT
+ KBUILD_CFLAGS += -mcmodel=large
+endif
+
+HOST_DIR := arch/$(HEADER_ARCH)
+
+include $(ARCH_DIR)/Makefile-skas
+include $(HOST_DIR)/Makefile.um
+
+core-y += $(HOST_DIR)/um/
+
+SHARED_HEADERS := $(ARCH_DIR)/include/shared
+ARCH_INCLUDE := -I$(srctree)/$(SHARED_HEADERS)
+ARCH_INCLUDE += -I$(srctree)/$(HOST_DIR)/um/shared
+KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/um
+
+# -Dvmap=kernel_vmap prevents anything from referencing the libpcap.o symbol so
+# named - it's a common symbol in libpcap, so we get a binary which crashes.
+#
+# Same things for in6addr_loopback and mktime - found in libc. For these two we
+# only get link-time error, luckily.
+#
+# These apply to USER_CFLAGS to.
+
+KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ \
+ $(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap \
+ -Din6addr_loopback=kernel_in6addr_loopback \
+ -Din6addr_any=kernel_in6addr_any -Dstrrchr=kernel_strrchr
+
+KBUILD_AFLAGS += $(ARCH_INCLUDE)
+
+USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -I%,,$(KBUILD_CFLAGS))) \
+ $(ARCH_INCLUDE) $(MODE_INCLUDE) $(filter -I%,$(CFLAGS)) \
+ -D_FILE_OFFSET_BITS=64 -idirafter $(srctree)/include \
+ -idirafter $(obj)/include -D__KERNEL__ -D__UM_HOST__
+
+#This will adjust *FLAGS accordingly to the platform.
+include $(ARCH_DIR)/Makefile-os-$(OS)
+
+KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/include \
+ -I$(srctree)/$(HOST_DIR)/include/uapi \
+ -I$(HOST_DIR)/include/generated \
+ -I$(HOST_DIR)/include/generated/uapi
+
+# -Derrno=kernel_errno - This turns all kernel references to errno into
+# kernel_errno to separate them from the libc errno. This allows -fno-common
+# in KBUILD_CFLAGS. Otherwise, it would cause ld to complain about the two different
+# errnos.
+# These apply to kernelspace only.
+#
+# strip leading and trailing whitespace to make the USER_CFLAGS removal of these
+# defines more robust
+
+KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
+ -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
+KBUILD_CFLAGS += $(KERNEL_DEFINES)
+
+PHONY += linux
+
+all: linux
+
+linux: vmlinux
+ @echo ' LINK $@'
+ $(Q)ln -f $< $@
+
+define archhelp
+ echo '* linux - Binary kernel image (./linux) - for backward'
+ echo ' compatibility only, this creates a hard link to the'
+ echo ' real kernel binary, the "vmlinux" binary you'
+ echo ' find in the kernel root.'
+endef
+
+KBUILD_KCONFIG := $(HOST_DIR)/um/Kconfig
+
+archheaders:
+ $(Q)$(MAKE) KBUILD_SRC= ARCH=$(HEADER_ARCH) archheaders
+
+archprepare: include/generated/user_constants.h
+
+LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
+LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib
+
+CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
+ $(call cc-option, -fno-stack-protector,) \
+ $(call cc-option, -fno-stack-protector-all,)
+
+# Options used by linker script
+export LDS_START := $(START)
+export LDS_ELF_ARCH := $(ELF_ARCH)
+export LDS_ELF_FORMAT := $(ELF_FORMAT)
+
+# The wrappers will select whether using "malloc" or the kernel allocator.
+LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
+
+LD_FLAGS_CMDLINE = $(foreach opt,$(LDFLAGS),-Wl,$(opt))
+
+# Used by link-vmlinux.sh which has special support for um link
+export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)
+
+# When cleaning we don't include .config, so we don't include
+# TT or skas makefiles and don't clean skas_ptregs.h.
+CLEAN_FILES += linux x.i gmon.out
+
+archclean:
+ @find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
+ -o -name '*.gcov' \) -type f -print | xargs rm -f
+
+# Generated files
+
+$(HOST_DIR)/um/user-offsets.s: __headers FORCE
+ $(Q)$(MAKE) $(build)=$(HOST_DIR)/um $@
+
+define filechk_gen-asm-offsets
+ (set -e; \
+ echo "/*"; \
+ echo " * DO NOT MODIFY."; \
+ echo " *"; \
+ echo " * This file was generated by arch/$(ARCH)/Makefile"; \
+ echo " *"; \
+ echo " */"; \
+ echo ""; \
+ sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
+ echo ""; )
+endef
+
+include/generated/user_constants.h: $(HOST_DIR)/um/user-offsets.s
+ $(call filechk,gen-asm-offsets)
+
+export SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS DEV_NULL_PATH
diff --git a/arch/um/Makefile-os-Linux b/arch/um/Makefile-os-Linux
new file mode 100644
index 0000000..2c8a598
--- /dev/null
+++ b/arch/um/Makefile-os-Linux
@@ -0,0 +1,9 @@
+#
+# Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
+# Licensed under the GPL
+#
+
+# To get a definition of F_SETSIG
+USER_CFLAGS += -D_GNU_SOURCE -D_LARGEFILE64_SOURCE
+KBUILD_CFLAGS += -D_LARGEFILE64_SOURCE
+DEV_NULL_PATH = \"/dev/null\"
diff --git a/arch/um/Makefile-skas b/arch/um/Makefile-skas
new file mode 100644
index 0000000..ac35de5
--- /dev/null
+++ b/arch/um/Makefile-skas
@@ -0,0 +1,12 @@
+#
+# Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+# Licensed under the GPL
+#
+
+GPROF_OPT += -pg
+GCOV_OPT += -fprofile-arcs -ftest-coverage
+
+CFLAGS-$(CONFIG_GCOV) += $(GCOV_OPT)
+CFLAGS-$(CONFIG_GPROF) += $(GPROF_OPT)
+LINK-$(CONFIG_GCOV) += $(GCOV_OPT)
+LINK-$(CONFIG_GPROF) += $(GPROF_OPT)
diff --git a/arch/um/configs/i386_defconfig b/arch/um/configs/i386_defconfig
new file mode 100644
index 0000000..a12bf68
--- /dev/null
+++ b/arch/um/configs/i386_defconfig
@@ -0,0 +1,76 @@
+CONFIG_3_LEVEL_PGTABLES=y
+# CONFIG_COMPACTION is not set
+CONFIG_BINFMT_MISC=m
+CONFIG_HOSTFS=y
+CONFIG_MAGIC_SYSRQ=y
+CONFIG_KERNEL_STACK_ORDER=1
+CONFIG_SYSVIPC=y
+CONFIG_POSIX_MQUEUE=y
+CONFIG_NO_HZ=y
+CONFIG_HIGH_RES_TIMERS=y
+CONFIG_BSD_PROCESS_ACCT=y
+CONFIG_IKCONFIG=y
+CONFIG_IKCONFIG_PROC=y
+CONFIG_LOG_BUF_SHIFT=14
+CONFIG_CGROUPS=y
+CONFIG_CGROUP_FREEZER=y
+CONFIG_CGROUP_DEVICE=y
+CONFIG_CPUSETS=y
+CONFIG_CGROUP_CPUACCT=y
+CONFIG_RESOURCE_COUNTERS=y
+CONFIG_CGROUP_SCHED=y
+CONFIG_BLK_CGROUP=y
+# CONFIG_PID_NS is not set
+CONFIG_SYSFS_DEPRECATED=y
+CONFIG_CC_OPTIMIZE_FOR_SIZE=y
+CONFIG_SLAB=y
+CONFIG_MODULES=y
+CONFIG_MODULE_UNLOAD=y
+# CONFIG_BLK_DEV_BSG is not set
+CONFIG_IOSCHED_CFQ=m
+CONFIG_SSL=y
+CONFIG_NULL_CHAN=y
+CONFIG_PORT_CHAN=y
+CONFIG_PTY_CHAN=y
+CONFIG_TTY_CHAN=y
+CONFIG_XTERM_CHAN=y
+CONFIG_CON_CHAN="pts"
+CONFIG_SSL_CHAN="pts"
+CONFIG_UML_SOUND=m
+CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug"
+CONFIG_DEVTMPFS=y
+CONFIG_DEVTMPFS_MOUNT=y
+CONFIG_BLK_DEV_UBD=y
+CONFIG_BLK_DEV_LOOP=m
+CONFIG_BLK_DEV_NBD=m
+CONFIG_DUMMY=m
+CONFIG_TUN=m
+CONFIG_PPP=m
+CONFIG_SLIP=m
+CONFIG_LEGACY_PTY_COUNT=32
+# CONFIG_HW_RANDOM is not set
+CONFIG_UML_RANDOM=y
+CONFIG_NET=y
+CONFIG_PACKET=y
+CONFIG_UNIX=y
+CONFIG_INET=y
+# CONFIG_INET_LRO is not set
+# CONFIG_IPV6 is not set
+CONFIG_UML_NET=y
+CONFIG_UML_NET_ETHERTAP=y
+CONFIG_UML_NET_TUNTAP=y
+CONFIG_UML_NET_SLIP=y
+CONFIG_UML_NET_DAEMON=y
+CONFIG_UML_NET_MCAST=y
+CONFIG_UML_NET_SLIRP=y
+CONFIG_EXT4_FS=y
+CONFIG_REISERFS_FS=y
+CONFIG_QUOTA=y
+CONFIG_AUTOFS4_FS=m
+CONFIG_ISO9660_FS=m
+CONFIG_JOLIET=y
+CONFIG_PROC_KCORE=y
+CONFIG_TMPFS=y
+CONFIG_NLS=y
+CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_KERNEL=y
diff --git a/arch/um/configs/x86_64_defconfig b/arch/um/configs/x86_64_defconfig
new file mode 100644
index 0000000..3aab117
--- /dev/null
+++ b/arch/um/configs/x86_64_defconfig
@@ -0,0 +1,75 @@
+# CONFIG_COMPACTION is not set
+CONFIG_BINFMT_MISC=m
+CONFIG_HOSTFS=y
+CONFIG_MAGIC_SYSRQ=y
+CONFIG_SYSVIPC=y
+CONFIG_POSIX_MQUEUE=y
+CONFIG_NO_HZ=y
+CONFIG_HIGH_RES_TIMERS=y
+CONFIG_BSD_PROCESS_ACCT=y
+CONFIG_IKCONFIG=y
+CONFIG_IKCONFIG_PROC=y
+CONFIG_LOG_BUF_SHIFT=14
+CONFIG_CGROUPS=y
+CONFIG_CGROUP_FREEZER=y
+CONFIG_CGROUP_DEVICE=y
+CONFIG_CPUSETS=y
+CONFIG_CGROUP_CPUACCT=y
+CONFIG_RESOURCE_COUNTERS=y
+CONFIG_CGROUP_SCHED=y
+CONFIG_BLK_CGROUP=y
+# CONFIG_PID_NS is not set
+CONFIG_SYSFS_DEPRECATED=y
+CONFIG_CC_OPTIMIZE_FOR_SIZE=y
+CONFIG_SLAB=y
+CONFIG_MODULES=y
+CONFIG_MODULE_UNLOAD=y
+# CONFIG_BLK_DEV_BSG is not set
+CONFIG_IOSCHED_CFQ=m
+CONFIG_SSL=y
+CONFIG_NULL_CHAN=y
+CONFIG_PORT_CHAN=y
+CONFIG_PTY_CHAN=y
+CONFIG_TTY_CHAN=y
+CONFIG_XTERM_CHAN=y
+CONFIG_CON_CHAN="pts"
+CONFIG_SSL_CHAN="pts"
+CONFIG_UML_SOUND=m
+CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug"
+CONFIG_DEVTMPFS=y
+CONFIG_DEVTMPFS_MOUNT=y
+CONFIG_BLK_DEV_UBD=y
+CONFIG_BLK_DEV_LOOP=m
+CONFIG_BLK_DEV_NBD=m
+CONFIG_DUMMY=m
+CONFIG_TUN=m
+CONFIG_PPP=m
+CONFIG_SLIP=m
+CONFIG_LEGACY_PTY_COUNT=32
+# CONFIG_HW_RANDOM is not set
+CONFIG_UML_RANDOM=y
+CONFIG_NET=y
+CONFIG_PACKET=y
+CONFIG_UNIX=y
+CONFIG_INET=y
+# CONFIG_INET_LRO is not set
+# CONFIG_IPV6 is not set
+CONFIG_UML_NET=y
+CONFIG_UML_NET_ETHERTAP=y
+CONFIG_UML_NET_TUNTAP=y
+CONFIG_UML_NET_SLIP=y
+CONFIG_UML_NET_DAEMON=y
+CONFIG_UML_NET_MCAST=y
+CONFIG_UML_NET_SLIRP=y
+CONFIG_EXT4_FS=y
+CONFIG_REISERFS_FS=y
+CONFIG_QUOTA=y
+CONFIG_AUTOFS4_FS=m
+CONFIG_ISO9660_FS=m
+CONFIG_JOLIET=y
+CONFIG_PROC_KCORE=y
+CONFIG_TMPFS=y
+CONFIG_NLS=y
+CONFIG_DEBUG_INFO=y
+CONFIG_FRAME_WARN=1024
+CONFIG_DEBUG_KERNEL=y
diff --git a/arch/um/drivers/Makefile b/arch/um/drivers/Makefile
new file mode 100644
index 0000000..e7582e1
--- /dev/null
+++ b/arch/um/drivers/Makefile
@@ -0,0 +1,67 @@
+#
+# Copyright (C) 2000, 2002, 2003 Jeff Dike (jdike@karaya.com)
+# Licensed under the GPL
+#
+
+# pcap is broken in 2.5 because kbuild doesn't allow pcap.a to be linked
+# in to pcap.o
+
+slip-objs := slip_kern.o slip_user.o
+slirp-objs := slirp_kern.o slirp_user.o
+daemon-objs := daemon_kern.o daemon_user.o
+umcast-objs := umcast_kern.o umcast_user.o
+net-objs := net_kern.o net_user.o
+mconsole-objs := mconsole_kern.o mconsole_user.o
+hostaudio-objs := hostaudio_kern.o
+ubd-objs := ubd_kern.o ubd_user.o
+port-objs := port_kern.o port_user.o
+harddog-objs := harddog_kern.o harddog_user.o
+
+LDFLAGS_pcap.o := -r $(shell $(CC) $(KBUILD_CFLAGS) -print-file-name=libpcap.a)
+
+LDFLAGS_vde.o := -r $(shell $(CC) $(CFLAGS) -print-file-name=libvdeplug.a)
+
+targets := pcap_kern.o pcap_user.o vde_kern.o vde_user.o
+
+$(obj)/pcap.o: $(obj)/pcap_kern.o $(obj)/pcap_user.o
+ $(LD) -r -dp -o $@ $^ $(LDFLAGS) $(LDFLAGS_pcap.o)
+
+$(obj)/vde.o: $(obj)/vde_kern.o $(obj)/vde_user.o
+ $(LD) -r -dp -o $@ $^ $(LDFLAGS) $(LDFLAGS_vde.o)
+
+#XXX: The call below does not work because the flags are added before the
+# object name, so nothing from the library gets linked.
+#$(call if_changed,ld)
+
+# When the above is fixed, don't forget to add this too!
+#targets += $(obj)/pcap.o
+
+obj-y := stdio_console.o fd.o chan_kern.o chan_user.o line.o
+obj-$(CONFIG_SSL) += ssl.o
+obj-$(CONFIG_STDERR_CONSOLE) += stderr_console.o
+
+obj-$(CONFIG_UML_NET_SLIP) += slip.o slip_common.o
+obj-$(CONFIG_UML_NET_SLIRP) += slirp.o slip_common.o
+obj-$(CONFIG_UML_NET_DAEMON) += daemon.o
+obj-$(CONFIG_UML_NET_VDE) += vde.o
+obj-$(CONFIG_UML_NET_MCAST) += umcast.o
+obj-$(CONFIG_UML_NET_PCAP) += pcap.o
+obj-$(CONFIG_UML_NET) += net.o
+obj-$(CONFIG_MCONSOLE) += mconsole.o
+obj-$(CONFIG_MMAPPER) += mmapper_kern.o
+obj-$(CONFIG_BLK_DEV_UBD) += ubd.o
+obj-$(CONFIG_HOSTAUDIO) += hostaudio.o
+obj-$(CONFIG_NULL_CHAN) += null.o
+obj-$(CONFIG_PORT_CHAN) += port.o
+obj-$(CONFIG_PTY_CHAN) += pty.o
+obj-$(CONFIG_TTY_CHAN) += tty.o
+obj-$(CONFIG_XTERM_CHAN) += xterm.o xterm_kern.o
+obj-$(CONFIG_UML_WATCHDOG) += harddog.o
+obj-$(CONFIG_BLK_DEV_COW_COMMON) += cow_user.o
+obj-$(CONFIG_UML_RANDOM) += random.o
+
+# pcap_user.o must be added explicitly.
+USER_OBJS := fd.o null.o pty.o tty.o xterm.o slip_common.o pcap_user.o vde_user.o
+CFLAGS_null.o = -DDEV_NULL=$(DEV_NULL_PATH)
+
+include arch/um/scripts/Makefile.rules
diff --git a/arch/um/drivers/chan.h b/arch/um/drivers/chan.h
new file mode 100644
index 0000000..c512b03
--- /dev/null
+++ b/arch/um/drivers/chan.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2000, 2001 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __CHAN_KERN_H__
+#define __CHAN_KERN_H__
+
+#include <linux/tty.h>
+#include <linux/list.h>
+#include <linux/console.h>
+#include "chan_user.h"
+#include "line.h"
+
+struct chan {
+ struct list_head list;
+ struct list_head free_list;
+ struct line *line;
+ char *dev;
+ unsigned int primary:1;
+ unsigned int input:1;
+ unsigned int output:1;
+ unsigned int opened:1;
+ unsigned int enabled:1;
+ int fd;
+ const struct chan_ops *ops;
+ void *data;
+};
+
+extern void chan_interrupt(struct line *line, int irq);
+extern int parse_chan_pair(char *str, struct line *line, int device,
+ const struct chan_opts *opts, char **error_out);
+extern int write_chan(struct chan *chan, const char *buf, int len,
+ int write_irq);
+extern int console_write_chan(struct chan *chan, const char *buf,
+ int len);
+extern int console_open_chan(struct line *line, struct console *co);
+extern void deactivate_chan(struct chan *chan, int irq);
+extern void reactivate_chan(struct chan *chan, int irq);
+extern void chan_enable_winch(struct chan *chan, struct tty_port *port);
+extern int enable_chan(struct line *line);
+extern void close_chan(struct line *line);
+extern int chan_window_size(struct line *line,
+ unsigned short *rows_out,
+ unsigned short *cols_out);
+extern int chan_config_string(struct line *line, char *str, int size,
+ char **error_out);
+
+#endif
diff --git a/arch/um/drivers/chan_kern.c b/arch/um/drivers/chan_kern.c
new file mode 100644
index 0000000..acbe6c6
--- /dev/null
+++ b/arch/um/drivers/chan_kern.c
@@ -0,0 +1,581 @@
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include "chan.h"
+#include <os.h>
+#include <irq_kern.h>
+
+#ifdef CONFIG_NOCONFIG_CHAN
+static void *not_configged_init(char *str, int device,
+ const struct chan_opts *opts)
+{
+ printk(KERN_ERR "Using a channel type which is configured out of "
+ "UML\n");
+ return NULL;
+}
+
+static int not_configged_open(int input, int output, int primary, void *data,
+ char **dev_out)
+{
+ printk(KERN_ERR "Using a channel type which is configured out of "
+ "UML\n");
+ return -ENODEV;
+}
+
+static void not_configged_close(int fd, void *data)
+{
+ printk(KERN_ERR "Using a channel type which is configured out of "
+ "UML\n");
+}
+
+static int not_configged_read(int fd, char *c_out, void *data)
+{
+ printk(KERN_ERR "Using a channel type which is configured out of "
+ "UML\n");
+ return -EIO;
+}
+
+static int not_configged_write(int fd, const char *buf, int len, void *data)
+{
+ printk(KERN_ERR "Using a channel type which is configured out of "
+ "UML\n");
+ return -EIO;
+}
+
+static int not_configged_console_write(int fd, const char *buf, int len)
+{
+ printk(KERN_ERR "Using a channel type which is configured out of "
+ "UML\n");
+ return -EIO;
+}
+
+static int not_configged_window_size(int fd, void *data, unsigned short *rows,
+ unsigned short *cols)
+{
+ printk(KERN_ERR "Using a channel type which is configured out of "
+ "UML\n");
+ return -ENODEV;
+}
+
+static void not_configged_free(void *data)
+{
+ printk(KERN_ERR "Using a channel type which is configured out of "
+ "UML\n");
+}
+
+static const struct chan_ops not_configged_ops = {
+ .init = not_configged_init,
+ .open = not_configged_open,
+ .close = not_configged_close,
+ .read = not_configged_read,
+ .write = not_configged_write,
+ .console_write = not_configged_console_write,
+ .window_size = not_configged_window_size,
+ .free = not_configged_free,
+ .winch = 0,
+};
+#endif /* CONFIG_NOCONFIG_CHAN */
+
+static int open_one_chan(struct chan *chan)
+{
+ int fd, err;
+
+ if (chan->opened)
+ return 0;
+
+ if (chan->ops->open == NULL)
+ fd = 0;
+ else fd = (*chan->ops->open)(chan->input, chan->output, chan->primary,
+ chan->data, &chan->dev);
+ if (fd < 0)
+ return fd;
+
+ err = os_set_fd_block(fd, 0);
+ if (err) {
+ (*chan->ops->close)(fd, chan->data);
+ return err;
+ }
+
+ chan->fd = fd;
+
+ chan->opened = 1;
+ return 0;
+}
+
+static int open_chan(struct list_head *chans)
+{
+ struct list_head *ele;
+ struct chan *chan;
+ int ret, err = 0;
+
+ list_for_each(ele, chans) {
+ chan = list_entry(ele, struct chan, list);
+ ret = open_one_chan(chan);
+ if (chan->primary)
+ err = ret;
+ }
+ return err;
+}
+
+void chan_enable_winch(struct chan *chan, struct tty_port *port)
+{
+ if (chan && chan->primary && chan->ops->winch)
+ register_winch(chan->fd, port);
+}
+
+static void line_timer_cb(struct work_struct *work)
+{
+ struct line *line = container_of(work, struct line, task.work);
+
+ if (!line->throttled)
+ chan_interrupt(line, line->driver->read_irq);
+}
+
+int enable_chan(struct line *line)
+{
+ struct list_head *ele;
+ struct chan *chan;
+ int err;
+
+ INIT_DELAYED_WORK(&line->task, line_timer_cb);
+
+ list_for_each(ele, &line->chan_list) {
+ chan = list_entry(ele, struct chan, list);
+ err = open_one_chan(chan);
+ if (err) {
+ if (chan->primary)
+ goto out_close;
+
+ continue;
+ }
+
+ if (chan->enabled)
+ continue;
+ err = line_setup_irq(chan->fd, chan->input, chan->output, line,
+ chan);
+ if (err)
+ goto out_close;
+
+ chan->enabled = 1;
+ }
+
+ return 0;
+
+ out_close:
+ close_chan(line);
+ return err;
+}
+
+/* Items are added in IRQ context, when free_irq can't be called, and
+ * removed in process context, when it can.
+ * This handles interrupt sources which disappear, and which need to
+ * be permanently disabled. This is discovered in IRQ context, but
+ * the freeing of the IRQ must be done later.
+ */
+static DEFINE_SPINLOCK(irqs_to_free_lock);
+static LIST_HEAD(irqs_to_free);
+
+void free_irqs(void)
+{
+ struct chan *chan;
+ LIST_HEAD(list);
+ struct list_head *ele;
+ unsigned long flags;
+
+ spin_lock_irqsave(&irqs_to_free_lock, flags);
+ list_splice_init(&irqs_to_free, &list);
+ spin_unlock_irqrestore(&irqs_to_free_lock, flags);
+
+ list_for_each(ele, &list) {
+ chan = list_entry(ele, struct chan, free_list);
+
+ if (chan->input && chan->enabled)
+ um_free_irq(chan->line->driver->read_irq, chan);
+ if (chan->output && chan->enabled)
+ um_free_irq(chan->line->driver->write_irq, chan);
+ chan->enabled = 0;
+ }
+}
+
+static void close_one_chan(struct chan *chan, int delay_free_irq)
+{
+ unsigned long flags;
+
+ if (!chan->opened)
+ return;
+
+ if (delay_free_irq) {
+ spin_lock_irqsave(&irqs_to_free_lock, flags);
+ list_add(&chan->free_list, &irqs_to_free);
+ spin_unlock_irqrestore(&irqs_to_free_lock, flags);
+ }
+ else {
+ if (chan->input && chan->enabled)
+ um_free_irq(chan->line->driver->read_irq, chan);
+ if (chan->output && chan->enabled)
+ um_free_irq(chan->line->driver->write_irq, chan);
+ chan->enabled = 0;
+ }
+ if (chan->ops->close != NULL)
+ (*chan->ops->close)(chan->fd, chan->data);
+
+ chan->opened = 0;
+ chan->fd = -1;
+}
+
+void close_chan(struct line *line)
+{
+ struct chan *chan;
+
+ /* Close in reverse order as open in case more than one of them
+ * refers to the same device and they save and restore that device's
+ * state. Then, the first one opened will have the original state,
+ * so it must be the last closed.
+ */
+ list_for_each_entry_reverse(chan, &line->chan_list, list) {
+ close_one_chan(chan, 0);
+ }
+}
+
+void deactivate_chan(struct chan *chan, int irq)
+{
+ if (chan && chan->enabled)
+ deactivate_fd(chan->fd, irq);
+}
+
+void reactivate_chan(struct chan *chan, int irq)
+{
+ if (chan && chan->enabled)
+ reactivate_fd(chan->fd, irq);
+}
+
+int write_chan(struct chan *chan, const char *buf, int len,
+ int write_irq)
+{
+ int n, ret = 0;
+
+ if (len == 0 || !chan || !chan->ops->write)
+ return 0;
+
+ n = chan->ops->write(chan->fd, buf, len, chan->data);
+ if (chan->primary) {
+ ret = n;
+ if ((ret == -EAGAIN) || ((ret >= 0) && (ret < len)))
+ reactivate_fd(chan->fd, write_irq);
+ }
+ return ret;
+}
+
+int console_write_chan(struct chan *chan, const char *buf, int len)
+{
+ int n, ret = 0;
+
+ if (!chan || !chan->ops->console_write)
+ return 0;
+
+ n = chan->ops->console_write(chan->fd, buf, len);
+ if (chan->primary)
+ ret = n;
+ return ret;
+}
+
+int console_open_chan(struct line *line, struct console *co)
+{
+ int err;
+
+ err = open_chan(&line->chan_list);
+ if (err)
+ return err;
+
+ printk(KERN_INFO "Console initialized on /dev/%s%d\n", co->name,
+ co->index);
+ return 0;
+}
+
+int chan_window_size(struct line *line, unsigned short *rows_out,
+ unsigned short *cols_out)
+{
+ struct chan *chan;
+
+ chan = line->chan_in;
+ if (chan && chan->primary) {
+ if (chan->ops->window_size == NULL)
+ return 0;
+ return chan->ops->window_size(chan->fd, chan->data,
+ rows_out, cols_out);
+ }
+ chan = line->chan_out;
+ if (chan && chan->primary) {
+ if (chan->ops->window_size == NULL)
+ return 0;
+ return chan->ops->window_size(chan->fd, chan->data,
+ rows_out, cols_out);
+ }
+ return 0;
+}
+
+static void free_one_chan(struct chan *chan)
+{
+ list_del(&chan->list);
+
+ close_one_chan(chan, 0);
+
+ if (chan->ops->free != NULL)
+ (*chan->ops->free)(chan->data);
+
+ if (chan->primary && chan->output)
+ ignore_sigio_fd(chan->fd);
+ kfree(chan);
+}
+
+static void free_chan(struct list_head *chans)
+{
+ struct list_head *ele, *next;
+ struct chan *chan;
+
+ list_for_each_safe(ele, next, chans) {
+ chan = list_entry(ele, struct chan, list);
+ free_one_chan(chan);
+ }
+}
+
+static int one_chan_config_string(struct chan *chan, char *str, int size,
+ char **error_out)
+{
+ int n = 0;
+
+ if (chan == NULL) {
+ CONFIG_CHUNK(str, size, n, "none", 1);
+ return n;
+ }
+
+ CONFIG_CHUNK(str, size, n, chan->ops->type, 0);
+
+ if (chan->dev == NULL) {
+ CONFIG_CHUNK(str, size, n, "", 1);
+ return n;
+ }
+
+ CONFIG_CHUNK(str, size, n, ":", 0);
+ CONFIG_CHUNK(str, size, n, chan->dev, 0);
+
+ return n;
+}
+
+static int chan_pair_config_string(struct chan *in, struct chan *out,
+ char *str, int size, char **error_out)
+{
+ int n;
+
+ n = one_chan_config_string(in, str, size, error_out);
+ str += n;
+ size -= n;
+
+ if (in == out) {
+ CONFIG_CHUNK(str, size, n, "", 1);
+ return n;
+ }
+
+ CONFIG_CHUNK(str, size, n, ",", 1);
+ n = one_chan_config_string(out, str, size, error_out);
+ str += n;
+ size -= n;
+ CONFIG_CHUNK(str, size, n, "", 1);
+
+ return n;
+}
+
+int chan_config_string(struct line *line, char *str, int size,
+ char **error_out)
+{
+ struct chan *in = line->chan_in, *out = line->chan_out;
+
+ if (in && !in->primary)
+ in = NULL;
+ if (out && !out->primary)
+ out = NULL;
+
+ return chan_pair_config_string(in, out, str, size, error_out);
+}
+
+struct chan_type {
+ char *key;
+ const struct chan_ops *ops;
+};
+
+static const struct chan_type chan_table[] = {
+ { "fd", &fd_ops },
+
+#ifdef CONFIG_NULL_CHAN
+ { "null", &null_ops },
+#else
+ { "null", ¬_configged_ops },
+#endif
+
+#ifdef CONFIG_PORT_CHAN
+ { "port", &port_ops },
+#else
+ { "port", ¬_configged_ops },
+#endif
+
+#ifdef CONFIG_PTY_CHAN
+ { "pty", &pty_ops },
+ { "pts", &pts_ops },
+#else
+ { "pty", ¬_configged_ops },
+ { "pts", ¬_configged_ops },
+#endif
+
+#ifdef CONFIG_TTY_CHAN
+ { "tty", &tty_ops },
+#else
+ { "tty", ¬_configged_ops },
+#endif
+
+#ifdef CONFIG_XTERM_CHAN
+ { "xterm", &xterm_ops },
+#else
+ { "xterm", ¬_configged_ops },
+#endif
+};
+
+static struct chan *parse_chan(struct line *line, char *str, int device,
+ const struct chan_opts *opts, char **error_out)
+{
+ const struct chan_type *entry;
+ const struct chan_ops *ops;
+ struct chan *chan;
+ void *data;
+ int i;
+
+ ops = NULL;
+ data = NULL;
+ for(i = 0; i < ARRAY_SIZE(chan_table); i++) {
+ entry = &chan_table[i];
+ if (!strncmp(str, entry->key, strlen(entry->key))) {
+ ops = entry->ops;
+ str += strlen(entry->key);
+ break;
+ }
+ }
+ if (ops == NULL) {
+ *error_out = "No match for configured backends";
+ return NULL;
+ }
+
+ data = (*ops->init)(str, device, opts);
+ if (data == NULL) {
+ *error_out = "Configuration failed";
+ return NULL;
+ }
+
+ chan = kmalloc(sizeof(*chan), GFP_ATOMIC);
+ if (chan == NULL) {
+ *error_out = "Memory allocation failed";
+ return NULL;
+ }
+ *chan = ((struct chan) { .list = LIST_HEAD_INIT(chan->list),
+ .free_list =
+ LIST_HEAD_INIT(chan->free_list),
+ .line = line,
+ .primary = 1,
+ .input = 0,
+ .output = 0,
+ .opened = 0,
+ .enabled = 0,
+ .fd = -1,
+ .ops = ops,
+ .data = data });
+ return chan;
+}
+
+int parse_chan_pair(char *str, struct line *line, int device,
+ const struct chan_opts *opts, char **error_out)
+{
+ struct list_head *chans = &line->chan_list;
+ struct chan *new;
+ char *in, *out;
+
+ if (!list_empty(chans)) {
+ line->chan_in = line->chan_out = NULL;
+ free_chan(chans);
+ INIT_LIST_HEAD(chans);
+ }
+
+ if (!str)
+ return 0;
+
+ out = strchr(str, ',');
+ if (out != NULL) {
+ in = str;
+ *out = '\0';
+ out++;
+ new = parse_chan(line, in, device, opts, error_out);
+ if (new == NULL)
+ return -1;
+
+ new->input = 1;
+ list_add(&new->list, chans);
+ line->chan_in = new;
+
+ new = parse_chan(line, out, device, opts, error_out);
+ if (new == NULL)
+ return -1;
+
+ list_add(&new->list, chans);
+ new->output = 1;
+ line->chan_out = new;
+ }
+ else {
+ new = parse_chan(line, str, device, opts, error_out);
+ if (new == NULL)
+ return -1;
+
+ list_add(&new->list, chans);
+ new->input = 1;
+ new->output = 1;
+ line->chan_in = line->chan_out = new;
+ }
+ return 0;
+}
+
+void chan_interrupt(struct line *line, int irq)
+{
+ struct tty_port *port = &line->port;
+ struct chan *chan = line->chan_in;
+ int err;
+ char c;
+
+ if (!chan || !chan->ops->read)
+ goto out;
+
+ do {
+ if (!tty_buffer_request_room(port, 1)) {
+ schedule_delayed_work(&line->task, 1);
+ goto out;
+ }
+ err = chan->ops->read(chan->fd, &c, chan->data);
+ if (err > 0)
+ tty_insert_flip_char(port, c, TTY_NORMAL);
+ } while (err > 0);
+
+ if (err == 0)
+ reactivate_fd(chan->fd, irq);
+ if (err == -EIO) {
+ if (chan->primary) {
+ tty_port_tty_hangup(&line->port, false);
+ if (line->chan_out != chan)
+ close_one_chan(line->chan_out, 1);
+ }
+ close_one_chan(chan, 1);
+ if (chan->primary)
+ return;
+ }
+ out:
+ tty_flip_buffer_push(port);
+}
diff --git a/arch/um/drivers/chan_user.c b/arch/um/drivers/chan_user.c
new file mode 100644
index 0000000..3fd7c3e
--- /dev/null
+++ b/arch/um/drivers/chan_user.c
@@ -0,0 +1,301 @@
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
+ * Licensed under the GPL
+ */
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sched.h>
+#include <signal.h>
+#include <termios.h>
+#include <sys/ioctl.h>
+#include "chan_user.h"
+#include <os.h>
+#include <um_malloc.h>
+
+void generic_close(int fd, void *unused)
+{
+ close(fd);
+}
+
+int generic_read(int fd, char *c_out, void *unused)
+{
+ int n;
+
+ n = read(fd, c_out, sizeof(*c_out));
+ if (n > 0)
+ return n;
+ else if (errno == EAGAIN)
+ return 0;
+ else if (n == 0)
+ return -EIO;
+ return -errno;
+}
+
+/* XXX Trivial wrapper around write */
+
+int generic_write(int fd, const char *buf, int n, void *unused)
+{
+ int err;
+
+ err = write(fd, buf, n);
+ if (err > 0)
+ return err;
+ else if (errno == EAGAIN)
+ return 0;
+ else if (err == 0)
+ return -EIO;
+ return -errno;
+}
+
+int generic_window_size(int fd, void *unused, unsigned short *rows_out,
+ unsigned short *cols_out)
+{
+ struct winsize size;
+ int ret;
+
+ if (ioctl(fd, TIOCGWINSZ, &size) < 0)
+ return -errno;
+
+ ret = ((*rows_out != size.ws_row) || (*cols_out != size.ws_col));
+
+ *rows_out = size.ws_row;
+ *cols_out = size.ws_col;
+
+ return ret;
+}
+
+void generic_free(void *data)
+{
+ kfree(data);
+}
+
+int generic_console_write(int fd, const char *buf, int n)
+{
+ sigset_t old, no_sigio;
+ struct termios save, new;
+ int err;
+
+ if (isatty(fd)) {
+ sigemptyset(&no_sigio);
+ sigaddset(&no_sigio, SIGIO);
+ if (sigprocmask(SIG_BLOCK, &no_sigio, &old))
+ goto error;
+
+ CATCH_EINTR(err = tcgetattr(fd, &save));
+ if (err)
+ goto error;
+ new = save;
+ /*
+ * The terminal becomes a bit less raw, to handle \n also as
+ * "Carriage Return", not only as "New Line". Otherwise, the new
+ * line won't start at the first column.
+ */
+ new.c_oflag |= OPOST;
+ CATCH_EINTR(err = tcsetattr(fd, TCSAFLUSH, &new));
+ if (err)
+ goto error;
+ }
+ err = generic_write(fd, buf, n, NULL);
+ /*
+ * Restore raw mode, in any case; we *must* ignore any error apart
+ * EINTR, except for debug.
+ */
+ if (isatty(fd)) {
+ CATCH_EINTR(tcsetattr(fd, TCSAFLUSH, &save));
+ sigprocmask(SIG_SETMASK, &old, NULL);
+ }
+
+ return err;
+error:
+ return -errno;
+}
+
+/*
+ * UML SIGWINCH handling
+ *
+ * The point of this is to handle SIGWINCH on consoles which have host
+ * ttys and relay them inside UML to whatever might be running on the
+ * console and cares about the window size (since SIGWINCH notifies
+ * about terminal size changes).
+ *
+ * So, we have a separate thread for each host tty attached to a UML
+ * device (side-issue - I'm annoyed that one thread can't have
+ * multiple controlling ttys for the purpose of handling SIGWINCH, but
+ * I imagine there are other reasons that doesn't make any sense).
+ *
+ * SIGWINCH can't be received synchronously, so you have to set up to
+ * receive it as a signal. That being the case, if you are going to
+ * wait for it, it is convenient to sit in sigsuspend() and wait for
+ * the signal to bounce you out of it (see below for how we make sure
+ * to exit only on SIGWINCH).
+ */
+
+static void winch_handler(int sig)
+{
+}
+
+struct winch_data {
+ int pty_fd;
+ int pipe_fd;
+};
+
+static int winch_thread(void *arg)
+{
+ struct winch_data *data = arg;
+ sigset_t sigs;
+ int pty_fd, pipe_fd;
+ int count;
+ char c = 1;
+
+ pty_fd = data->pty_fd;
+ pipe_fd = data->pipe_fd;
+ count = write(pipe_fd, &c, sizeof(c));
+ if (count != sizeof(c))
+ printk(UM_KERN_ERR "winch_thread : failed to write "
+ "synchronization byte, err = %d\n", -count);
+
+ /*
+ * We are not using SIG_IGN on purpose, so don't fix it as I thought to
+ * do! If using SIG_IGN, the sigsuspend() call below would not stop on
+ * SIGWINCH.
+ */
+
+ signal(SIGWINCH, winch_handler);
+ sigfillset(&sigs);
+ /* Block all signals possible. */
+ if (sigprocmask(SIG_SETMASK, &sigs, NULL) < 0) {
+ printk(UM_KERN_ERR "winch_thread : sigprocmask failed, "
+ "errno = %d\n", errno);
+ exit(1);
+ }
+ /* In sigsuspend(), block anything else than SIGWINCH. */
+ sigdelset(&sigs, SIGWINCH);
+
+ if (setsid() < 0) {
+ printk(UM_KERN_ERR "winch_thread : setsid failed, errno = %d\n",
+ errno);
+ exit(1);
+ }
+
+ if (ioctl(pty_fd, TIOCSCTTY, 0) < 0) {
+ printk(UM_KERN_ERR "winch_thread : TIOCSCTTY failed on "
+ "fd %d err = %d\n", pty_fd, errno);
+ exit(1);
+ }
+
+ if (tcsetpgrp(pty_fd, os_getpid()) < 0) {
+ printk(UM_KERN_ERR "winch_thread : tcsetpgrp failed on "
+ "fd %d err = %d\n", pty_fd, errno);
+ exit(1);
+ }
+
+ /*
+ * These are synchronization calls between various UML threads on the
+ * host - since they are not different kernel threads, we cannot use
+ * kernel semaphores. We don't use SysV semaphores because they are
+ * persistent.
+ */
+ count = read(pipe_fd, &c, sizeof(c));
+ if (count != sizeof(c))
+ printk(UM_KERN_ERR "winch_thread : failed to read "
+ "synchronization byte, err = %d\n", errno);
+
+ while(1) {
+ /*
+ * This will be interrupted by SIGWINCH only, since
+ * other signals are blocked.
+ */
+ sigsuspend(&sigs);
+
+ count = write(pipe_fd, &c, sizeof(c));
+ if (count != sizeof(c))
+ printk(UM_KERN_ERR "winch_thread : write failed, "
+ "err = %d\n", errno);
+ }
+}
+
+static int winch_tramp(int fd, struct tty_port *port, int *fd_out,
+ unsigned long *stack_out)
+{
+ struct winch_data data;
+ int fds[2], n, err;
+ char c;
+
+ err = os_pipe(fds, 1, 1);
+ if (err < 0) {
+ printk(UM_KERN_ERR "winch_tramp : os_pipe failed, err = %d\n",
+ -err);
+ goto out;
+ }
+
+ data = ((struct winch_data) { .pty_fd = fd,
+ .pipe_fd = fds[1] } );
+ /*
+ * CLONE_FILES so this thread doesn't hold open files which are open
+ * now, but later closed in a different thread. This is a
+ * problem with /dev/net/tun, which if held open by this
+ * thread, prevents the TUN/TAP device from being reused.
+ */
+ err = run_helper_thread(winch_thread, &data, CLONE_FILES, stack_out);
+ if (err < 0) {
+ printk(UM_KERN_ERR "fork of winch_thread failed - errno = %d\n",
+ -err);
+ goto out_close;
+ }
+
+ *fd_out = fds[0];
+ n = read(fds[0], &c, sizeof(c));
+ if (n != sizeof(c)) {
+ printk(UM_KERN_ERR "winch_tramp : failed to read "
+ "synchronization byte\n");
+ printk(UM_KERN_ERR "read failed, err = %d\n", errno);
+ printk(UM_KERN_ERR "fd %d will not support SIGWINCH\n", fd);
+ err = -EINVAL;
+ goto out_close;
+ }
+
+ if (os_set_fd_block(*fd_out, 0)) {
+ printk(UM_KERN_ERR "winch_tramp: failed to set thread_fd "
+ "non-blocking.\n");
+ goto out_close;
+ }
+
+ return err;
+
+ out_close:
+ close(fds[1]);
+ close(fds[0]);
+ out:
+ return err;
+}
+
+void register_winch(int fd, struct tty_port *port)
+{
+ unsigned long stack;
+ int pid, thread, count, thread_fd = -1;
+ char c = 1;
+
+ if (!isatty(fd))
+ return;
+
+ pid = tcgetpgrp(fd);
+ if (is_skas_winch(pid, fd, port)) {
+ register_winch_irq(-1, fd, -1, port, 0);
+ return;
+ }
+
+ if (pid == -1) {
+ thread = winch_tramp(fd, port, &thread_fd, &stack);
+ if (thread < 0)
+ return;
+
+ register_winch_irq(thread_fd, fd, thread, port, stack);
+
+ count = write(thread_fd, &c, sizeof(c));
+ if (count != sizeof(c))
+ printk(UM_KERN_ERR "register_winch : failed to write "
+ "synchronization byte, err = %d\n", errno);
+ }
+}
diff --git a/arch/um/drivers/chan_user.h b/arch/um/drivers/chan_user.h
new file mode 100644
index 0000000..03f1b56
--- /dev/null
+++ b/arch/um/drivers/chan_user.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2000, 2001 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __CHAN_USER_H__
+#define __CHAN_USER_H__
+
+#include <init.h>
+
+struct chan_opts {
+ void (*const announce)(char *dev_name, int dev);
+ char *xterm_title;
+ const int raw;
+};
+
+struct chan_ops {
+ char *type;
+ void *(*init)(char *, int, const struct chan_opts *);
+ int (*open)(int, int, int, void *, char **);
+ void (*close)(int, void *);
+ int (*read)(int, char *, void *);
+ int (*write)(int, const char *, int, void *);
+ int (*console_write)(int, const char *, int);
+ int (*window_size)(int, void *, unsigned short *, unsigned short *);
+ void (*free)(void *);
+ int winch;
+};
+
+extern const struct chan_ops fd_ops, null_ops, port_ops, pts_ops, pty_ops,
+ tty_ops, xterm_ops;
+
+extern void generic_close(int fd, void *unused);
+extern int generic_read(int fd, char *c_out, void *unused);
+extern int generic_write(int fd, const char *buf, int n, void *unused);
+extern int generic_console_write(int fd, const char *buf, int n);
+extern int generic_window_size(int fd, void *unused, unsigned short *rows_out,
+ unsigned short *cols_out);
+extern void generic_free(void *data);
+
+struct tty_port;
+extern void register_winch(int fd, struct tty_port *port);
+extern void register_winch_irq(int fd, int tty_fd, int pid,
+ struct tty_port *port, unsigned long stack);
+
+#define __channel_help(fn, prefix) \
+__uml_help(fn, prefix "[0-9]*=<channel description>\n" \
+" Attach a console or serial line to a host channel. See\n" \
+" http://user-mode-linux.sourceforge.net/old/input.html for a complete\n" \
+" description of this switch.\n\n" \
+);
+
+#endif
diff --git a/arch/um/drivers/cow.h b/arch/um/drivers/cow.h
new file mode 100644
index 0000000..6673508
--- /dev/null
+++ b/arch/um/drivers/cow.h
@@ -0,0 +1,32 @@
+#ifndef __COW_H__
+#define __COW_H__
+
+#include <asm/types.h>
+
+extern int init_cow_file(int fd, char *cow_file, char *backing_file,
+ int sectorsize, int alignment, int *bitmap_offset_out,
+ unsigned long *bitmap_len_out, int *data_offset_out);
+
+extern int file_reader(__u64 offset, char *buf, int len, void *arg);
+extern int read_cow_header(int (*reader)(__u64, char *, int, void *),
+ void *arg, __u32 *version_out,
+ char **backing_file_out, time_t *mtime_out,
+ unsigned long long *size_out, int *sectorsize_out,
+ __u32 *align_out, int *bitmap_offset_out);
+
+extern int write_cow_header(char *cow_file, int fd, char *backing_file,
+ int sectorsize, int alignment,
+ unsigned long long *size);
+
+extern void cow_sizes(int version, __u64 size, int sectorsize, int align,
+ int bitmap_offset, unsigned long *bitmap_len_out,
+ int *data_offset_out);
+
+#endif
+
+/*
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/cow_sys.h b/arch/um/drivers/cow_sys.h
new file mode 100644
index 0000000..67cbee6
--- /dev/null
+++ b/arch/um/drivers/cow_sys.h
@@ -0,0 +1,40 @@
+#ifndef __COW_SYS_H__
+#define __COW_SYS_H__
+
+#include <kern_util.h>
+#include <os.h>
+#include <um_malloc.h>
+
+static inline void *cow_malloc(int size)
+{
+ return uml_kmalloc(size, UM_GFP_KERNEL);
+}
+
+static inline void cow_free(void *ptr)
+{
+ kfree(ptr);
+}
+
+#define cow_printf printk
+
+static inline char *cow_strdup(char *str)
+{
+ return uml_strdup(str);
+}
+
+static inline int cow_seek_file(int fd, __u64 offset)
+{
+ return os_seek_file(fd, offset);
+}
+
+static inline int cow_file_size(char *file, unsigned long long *size_out)
+{
+ return os_file_size(file, size_out);
+}
+
+static inline int cow_write_file(int fd, void *buf, int size)
+{
+ return os_write_file(fd, buf, size);
+}
+
+#endif
diff --git a/arch/um/drivers/cow_user.c b/arch/um/drivers/cow_user.c
new file mode 100644
index 0000000..0ee9cc6
--- /dev/null
+++ b/arch/um/drivers/cow_user.c
@@ -0,0 +1,443 @@
+/*
+ * Copyright (C) 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
+ * Licensed under the GPL
+ */
+
+/*
+ * _XOPEN_SOURCE is needed for pread, but we define _GNU_SOURCE, which defines
+ * that.
+ */
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <arpa/inet.h>
+#include <endian.h>
+#include "cow.h"
+#include "cow_sys.h"
+
+#define PATH_LEN_V1 256
+
+typedef __u32 time32_t;
+
+struct cow_header_v1 {
+ __s32 magic;
+ __s32 version;
+ char backing_file[PATH_LEN_V1];
+ time32_t mtime;
+ __u64 size;
+ __s32 sectorsize;
+} __attribute__((packed));
+
+/*
+ * Define PATH_LEN_V3 as the usual value of MAXPATHLEN, just hard-code it in
+ * case other systems have different values for MAXPATHLEN.
+ *
+ * The same must hold for V2 - we want file format compatibility, not anything
+ * else.
+ */
+#define PATH_LEN_V3 4096
+#define PATH_LEN_V2 PATH_LEN_V3
+
+struct cow_header_v2 {
+ __u32 magic;
+ __u32 version;
+ char backing_file[PATH_LEN_V2];
+ time32_t mtime;
+ __u64 size;
+ __s32 sectorsize;
+} __attribute__((packed));
+
+/*
+ * Changes from V2 -
+ * PATH_LEN_V3 as described above
+ * Explicitly specify field bit lengths for systems with different
+ * lengths for the usual C types. Not sure whether char or
+ * time_t should be changed, this can be changed later without
+ * breaking compatibility
+ * Add alignment field so that different alignments can be used for the
+ * bitmap and data
+ * Add cow_format field to allow for the possibility of different ways
+ * of specifying the COW blocks. For now, the only value is 0,
+ * for the traditional COW bitmap.
+ * Move the backing_file field to the end of the header. This allows
+ * for the possibility of expanding it into the padding required
+ * by the bitmap alignment.
+ * The bitmap and data portions of the file will be aligned as specified
+ * by the alignment field. This is to allow COW files to be
+ * put on devices with restrictions on access alignments, such as
+ * /dev/raw, with a 512 byte alignment restriction. This also
+ * allows the data to be more aligned more strictly than on
+ * sector boundaries. This is needed for ubd-mmap, which needs
+ * the data to be page aligned.
+ * Fixed (finally!) the rounding bug
+ */
+
+/*
+ * Until Dec2005, __attribute__((packed)) was left out from the below
+ * definition, leading on 64-bit systems to 4 bytes of padding after mtime, to
+ * align size to 8-byte alignment. This shifted all fields above (no padding
+ * was present on 32-bit, no other padding was added).
+ *
+ * However, this _can be detected_: it means that cow_format (always 0 until
+ * now) is shifted onto the first 4 bytes of backing_file, where it is otherwise
+ * impossible to find 4 zeros. -bb */
+
+struct cow_header_v3 {
+ __u32 magic;
+ __u32 version;
+ __u32 mtime;
+ __u64 size;
+ __u32 sectorsize;
+ __u32 alignment;
+ __u32 cow_format;
+ char backing_file[PATH_LEN_V3];
+} __attribute__((packed));
+
+/* This is the broken layout used by some 64-bit binaries. */
+struct cow_header_v3_broken {
+ __u32 magic;
+ __u32 version;
+ __s64 mtime;
+ __u64 size;
+ __u32 sectorsize;
+ __u32 alignment;
+ __u32 cow_format;
+ char backing_file[PATH_LEN_V3];
+};
+
+/* COW format definitions - for now, we have only the usual COW bitmap */
+#define COW_BITMAP 0
+
+union cow_header {
+ struct cow_header_v1 v1;
+ struct cow_header_v2 v2;
+ struct cow_header_v3 v3;
+ struct cow_header_v3_broken v3_b;
+};
+
+#define COW_MAGIC 0x4f4f4f4d /* MOOO */
+#define COW_VERSION 3
+
+#define DIV_ROUND(x, len) (((x) + (len) - 1) / (len))
+#define ROUND_UP(x, align) DIV_ROUND(x, align) * (align)
+
+void cow_sizes(int version, __u64 size, int sectorsize, int align,
+ int bitmap_offset, unsigned long *bitmap_len_out,
+ int *data_offset_out)
+{
+ if (version < 3) {
+ *bitmap_len_out = (size + sectorsize - 1) / (8 * sectorsize);
+
+ *data_offset_out = bitmap_offset + *bitmap_len_out;
+ *data_offset_out = (*data_offset_out + sectorsize - 1) /
+ sectorsize;
+ *data_offset_out *= sectorsize;
+ }
+ else {
+ *bitmap_len_out = DIV_ROUND(size, sectorsize);
+ *bitmap_len_out = DIV_ROUND(*bitmap_len_out, 8);
+
+ *data_offset_out = bitmap_offset + *bitmap_len_out;
+ *data_offset_out = ROUND_UP(*data_offset_out, align);
+ }
+}
+
+static int absolutize(char *to, int size, char *from)
+{
+ char save_cwd[256], *slash;
+ int remaining;
+
+ if (getcwd(save_cwd, sizeof(save_cwd)) == NULL) {
+ cow_printf("absolutize : unable to get cwd - errno = %d\n",
+ errno);
+ return -1;
+ }
+ slash = strrchr(from, '/');
+ if (slash != NULL) {
+ *slash = '\0';
+ if (chdir(from)) {
+ *slash = '/';
+ cow_printf("absolutize : Can't cd to '%s' - "
+ "errno = %d\n", from, errno);
+ return -1;
+ }
+ *slash = '/';
+ if (getcwd(to, size) == NULL) {
+ cow_printf("absolutize : unable to get cwd of '%s' - "
+ "errno = %d\n", from, errno);
+ return -1;
+ }
+ remaining = size - strlen(to);
+ if (strlen(slash) + 1 > remaining) {
+ cow_printf("absolutize : unable to fit '%s' into %d "
+ "chars\n", from, size);
+ return -1;
+ }
+ strcat(to, slash);
+ }
+ else {
+ if (strlen(save_cwd) + 1 + strlen(from) + 1 > size) {
+ cow_printf("absolutize : unable to fit '%s' into %d "
+ "chars\n", from, size);
+ return -1;
+ }
+ strcpy(to, save_cwd);
+ strcat(to, "/");
+ strcat(to, from);
+ }
+ if (chdir(save_cwd)) {
+ cow_printf("absolutize : Can't cd to '%s' - "
+ "errno = %d\n", save_cwd, errno);
+ return -1;
+ }
+ return 0;
+}
+
+int write_cow_header(char *cow_file, int fd, char *backing_file,
+ int sectorsize, int alignment, unsigned long long *size)
+{
+ struct cow_header_v3 *header;
+ unsigned long modtime;
+ int err;
+
+ err = cow_seek_file(fd, 0);
+ if (err < 0) {
+ cow_printf("write_cow_header - lseek failed, err = %d\n", -err);
+ goto out;
+ }
+
+ err = -ENOMEM;
+ header = cow_malloc(sizeof(*header));
+ if (header == NULL) {
+ cow_printf("write_cow_header - failed to allocate COW V3 "
+ "header\n");
+ goto out;
+ }
+ header->magic = htobe32(COW_MAGIC);
+ header->version = htobe32(COW_VERSION);
+
+ err = -EINVAL;
+ if (strlen(backing_file) > sizeof(header->backing_file) - 1) {
+ /* Below, %zd is for a size_t value */
+ cow_printf("Backing file name \"%s\" is too long - names are "
+ "limited to %zd characters\n", backing_file,
+ sizeof(header->backing_file) - 1);
+ goto out_free;
+ }
+
+ if (absolutize(header->backing_file, sizeof(header->backing_file),
+ backing_file))
+ goto out_free;
+
+ err = os_file_modtime(header->backing_file, &modtime);
+ if (err < 0) {
+ cow_printf("write_cow_header - backing file '%s' mtime "
+ "request failed, err = %d\n", header->backing_file,
+ -err);
+ goto out_free;
+ }
+
+ err = cow_file_size(header->backing_file, size);
+ if (err < 0) {
+ cow_printf("write_cow_header - couldn't get size of "
+ "backing file '%s', err = %d\n",
+ header->backing_file, -err);
+ goto out_free;
+ }
+
+ header->mtime = htobe32(modtime);
+ header->size = htobe64(*size);
+ header->sectorsize = htobe32(sectorsize);
+ header->alignment = htobe32(alignment);
+ header->cow_format = COW_BITMAP;
+
+ err = cow_write_file(fd, header, sizeof(*header));
+ if (err != sizeof(*header)) {
+ cow_printf("write_cow_header - write of header to "
+ "new COW file '%s' failed, err = %d\n", cow_file,
+ -err);
+ goto out_free;
+ }
+ err = 0;
+ out_free:
+ cow_free(header);
+ out:
+ return err;
+}
+
+int file_reader(__u64 offset, char *buf, int len, void *arg)
+{
+ int fd = *((int *) arg);
+
+ return pread(fd, buf, len, offset);
+}
+
+/* XXX Need to sanity-check the values read from the header */
+
+int read_cow_header(int (*reader)(__u64, char *, int, void *), void *arg,
+ __u32 *version_out, char **backing_file_out,
+ time_t *mtime_out, unsigned long long *size_out,
+ int *sectorsize_out, __u32 *align_out,
+ int *bitmap_offset_out)
+{
+ union cow_header *header;
+ char *file;
+ int err, n;
+ unsigned long version, magic;
+
+ header = cow_malloc(sizeof(*header));
+ if (header == NULL) {
+ cow_printf("read_cow_header - Failed to allocate header\n");
+ return -ENOMEM;
+ }
+ err = -EINVAL;
+ n = (*reader)(0, (char *) header, sizeof(*header), arg);
+ if (n < offsetof(typeof(header->v1), backing_file)) {
+ cow_printf("read_cow_header - short header\n");
+ goto out;
+ }
+
+ magic = header->v1.magic;
+ if (magic == COW_MAGIC)
+ version = header->v1.version;
+ else if (magic == be32toh(COW_MAGIC))
+ version = be32toh(header->v1.version);
+ /* No error printed because the non-COW case comes through here */
+ else goto out;
+
+ *version_out = version;
+
+ if (version == 1) {
+ if (n < sizeof(header->v1)) {
+ cow_printf("read_cow_header - failed to read V1 "
+ "header\n");
+ goto out;
+ }
+ *mtime_out = header->v1.mtime;
+ *size_out = header->v1.size;
+ *sectorsize_out = header->v1.sectorsize;
+ *bitmap_offset_out = sizeof(header->v1);
+ *align_out = *sectorsize_out;
+ file = header->v1.backing_file;
+ }
+ else if (version == 2) {
+ if (n < sizeof(header->v2)) {
+ cow_printf("read_cow_header - failed to read V2 "
+ "header\n");
+ goto out;
+ }
+ *mtime_out = be32toh(header->v2.mtime);
+ *size_out = be64toh(header->v2.size);
+ *sectorsize_out = be32toh(header->v2.sectorsize);
+ *bitmap_offset_out = sizeof(header->v2);
+ *align_out = *sectorsize_out;
+ file = header->v2.backing_file;
+ }
+ /* This is very subtle - see above at union cow_header definition */
+ else if (version == 3 && (*((int*)header->v3.backing_file) != 0)) {
+ if (n < sizeof(header->v3)) {
+ cow_printf("read_cow_header - failed to read V3 "
+ "header\n");
+ goto out;
+ }
+ *mtime_out = be32toh(header->v3.mtime);
+ *size_out = be64toh(header->v3.size);
+ *sectorsize_out = be32toh(header->v3.sectorsize);
+ *align_out = be32toh(header->v3.alignment);
+ if (*align_out == 0) {
+ cow_printf("read_cow_header - invalid COW header, "
+ "align == 0\n");
+ }
+ *bitmap_offset_out = ROUND_UP(sizeof(header->v3), *align_out);
+ file = header->v3.backing_file;
+ }
+ else if (version == 3) {
+ cow_printf("read_cow_header - broken V3 file with"
+ " 64-bit layout - recovering content.\n");
+
+ if (n < sizeof(header->v3_b)) {
+ cow_printf("read_cow_header - failed to read V3 "
+ "header\n");
+ goto out;
+ }
+
+ /*
+ * this was used until Dec2005 - 64bits are needed to represent
+ * 2038+. I.e. we can safely do this truncating cast.
+ *
+ * Additionally, we must use be32toh() instead of be64toh(), since
+ * the program used to use the former (tested - I got mtime
+ * mismatch "0 vs whatever").
+ *
+ * Ever heard about bug-to-bug-compatibility ? ;-) */
+ *mtime_out = (time32_t) be32toh(header->v3_b.mtime);
+
+ *size_out = be64toh(header->v3_b.size);
+ *sectorsize_out = be32toh(header->v3_b.sectorsize);
+ *align_out = be32toh(header->v3_b.alignment);
+ if (*align_out == 0) {
+ cow_printf("read_cow_header - invalid COW header, "
+ "align == 0\n");
+ }
+ *bitmap_offset_out = ROUND_UP(sizeof(header->v3_b), *align_out);
+ file = header->v3_b.backing_file;
+ }
+ else {
+ cow_printf("read_cow_header - invalid COW version\n");
+ goto out;
+ }
+ err = -ENOMEM;
+ *backing_file_out = cow_strdup(file);
+ if (*backing_file_out == NULL) {
+ cow_printf("read_cow_header - failed to allocate backing "
+ "file\n");
+ goto out;
+ }
+ err = 0;
+ out:
+ cow_free(header);
+ return err;
+}
+
+int init_cow_file(int fd, char *cow_file, char *backing_file, int sectorsize,
+ int alignment, int *bitmap_offset_out,
+ unsigned long *bitmap_len_out, int *data_offset_out)
+{
+ unsigned long long size, offset;
+ char zero = 0;
+ int err;
+
+ err = write_cow_header(cow_file, fd, backing_file, sectorsize,
+ alignment, &size);
+ if (err)
+ goto out;
+
+ *bitmap_offset_out = ROUND_UP(sizeof(struct cow_header_v3), alignment);
+ cow_sizes(COW_VERSION, size, sectorsize, alignment, *bitmap_offset_out,
+ bitmap_len_out, data_offset_out);
+
+ offset = *data_offset_out + size - sizeof(zero);
+ err = cow_seek_file(fd, offset);
+ if (err < 0) {
+ cow_printf("cow bitmap lseek failed : err = %d\n", -err);
+ goto out;
+ }
+
+ /*
+ * does not really matter how much we write it is just to set EOF
+ * this also sets the entire COW bitmap
+ * to zero without having to allocate it
+ */
+ err = cow_write_file(fd, &zero, sizeof(zero));
+ if (err != sizeof(zero)) {
+ cow_printf("Write of bitmap to new COW file '%s' failed, "
+ "err = %d\n", cow_file, -err);
+ if (err >= 0)
+ err = -EINVAL;
+ goto out;
+ }
+
+ return 0;
+ out:
+ return err;
+}
diff --git a/arch/um/drivers/daemon.h b/arch/um/drivers/daemon.h
new file mode 100644
index 0000000..c2dd195
--- /dev/null
+++ b/arch/um/drivers/daemon.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __DAEMON_H__
+#define __DAEMON_H__
+
+#include <net_user.h>
+
+#define SWITCH_VERSION 3
+
+struct daemon_data {
+ char *sock_type;
+ char *ctl_sock;
+ void *ctl_addr;
+ void *data_addr;
+ void *local_addr;
+ int fd;
+ int control;
+ void *dev;
+};
+
+extern const struct net_user_info daemon_user_info;
+
+extern int daemon_user_write(int fd, void *buf, int len,
+ struct daemon_data *pri);
+
+#endif
diff --git a/arch/um/drivers/daemon_kern.c b/arch/um/drivers/daemon_kern.c
new file mode 100644
index 0000000..7568cc2
--- /dev/null
+++ b/arch/um/drivers/daemon_kern.c
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
+ * James Leu (jleu@mindspring.net).
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Copyright (C) 2001 by various other people who didn't put their name here.
+ * Licensed under the GPL.
+ */
+
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <net_kern.h>
+#include "daemon.h"
+
+struct daemon_init {
+ char *sock_type;
+ char *ctl_sock;
+};
+
+static void daemon_init(struct net_device *dev, void *data)
+{
+ struct uml_net_private *pri;
+ struct daemon_data *dpri;
+ struct daemon_init *init = data;
+
+ pri = netdev_priv(dev);
+ dpri = (struct daemon_data *) pri->user;
+ dpri->sock_type = init->sock_type;
+ dpri->ctl_sock = init->ctl_sock;
+ dpri->fd = -1;
+ dpri->control = -1;
+ dpri->dev = dev;
+ /* We will free this pointer. If it contains crap we're burned. */
+ dpri->ctl_addr = NULL;
+ dpri->data_addr = NULL;
+ dpri->local_addr = NULL;
+
+ printk("daemon backend (uml_switch version %d) - %s:%s",
+ SWITCH_VERSION, dpri->sock_type, dpri->ctl_sock);
+ printk("\n");
+}
+
+static int daemon_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ return net_recvfrom(fd, skb_mac_header(skb),
+ skb->dev->mtu + ETH_HEADER_OTHER);
+}
+
+static int daemon_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ return daemon_user_write(fd, skb->data, skb->len,
+ (struct daemon_data *) &lp->user);
+}
+
+static const struct net_kern_info daemon_kern_info = {
+ .init = daemon_init,
+ .protocol = eth_protocol,
+ .read = daemon_read,
+ .write = daemon_write,
+};
+
+static int daemon_setup(char *str, char **mac_out, void *data)
+{
+ struct daemon_init *init = data;
+ char *remain;
+
+ *init = ((struct daemon_init)
+ { .sock_type = "unix",
+ .ctl_sock = "/tmp/uml.ctl" });
+
+ remain = split_if_spec(str, mac_out, &init->sock_type, &init->ctl_sock,
+ NULL);
+ if (remain != NULL)
+ printk(KERN_WARNING "daemon_setup : Ignoring data socket "
+ "specification\n");
+
+ return 1;
+}
+
+static struct transport daemon_transport = {
+ .list = LIST_HEAD_INIT(daemon_transport.list),
+ .name = "daemon",
+ .setup = daemon_setup,
+ .user = &daemon_user_info,
+ .kern = &daemon_kern_info,
+ .private_size = sizeof(struct daemon_data),
+ .setup_size = sizeof(struct daemon_init),
+};
+
+static int register_daemon(void)
+{
+ register_transport(&daemon_transport);
+ return 0;
+}
+
+late_initcall(register_daemon);
diff --git a/arch/um/drivers/daemon_user.c b/arch/um/drivers/daemon_user.c
new file mode 100644
index 0000000..8813c10
--- /dev/null
+++ b/arch/um/drivers/daemon_user.c
@@ -0,0 +1,193 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
+ * James Leu (jleu@mindspring.net).
+ * Copyright (C) 2001 by various other people who didn't put their name here.
+ * Licensed under the GPL.
+ */
+
+#include <stdint.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <sys/un.h>
+#include "daemon.h"
+#include <net_user.h>
+#include <os.h>
+#include <um_malloc.h>
+
+enum request_type { REQ_NEW_CONTROL };
+
+#define SWITCH_MAGIC 0xfeedface
+
+struct request_v3 {
+ uint32_t magic;
+ uint32_t version;
+ enum request_type type;
+ struct sockaddr_un sock;
+};
+
+static struct sockaddr_un *new_addr(void *name, int len)
+{
+ struct sockaddr_un *sun;
+
+ sun = uml_kmalloc(sizeof(struct sockaddr_un), UM_GFP_KERNEL);
+ if (sun == NULL) {
+ printk(UM_KERN_ERR "new_addr: allocation of sockaddr_un "
+ "failed\n");
+ return NULL;
+ }
+ sun->sun_family = AF_UNIX;
+ memcpy(sun->sun_path, name, len);
+ return sun;
+}
+
+static int connect_to_switch(struct daemon_data *pri)
+{
+ struct sockaddr_un *ctl_addr = pri->ctl_addr;
+ struct sockaddr_un *local_addr = pri->local_addr;
+ struct sockaddr_un *sun;
+ struct request_v3 req;
+ int fd, n, err;
+
+ pri->control = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (pri->control < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "daemon_open : control socket failed, "
+ "errno = %d\n", -err);
+ return err;
+ }
+
+ if (connect(pri->control, (struct sockaddr *) ctl_addr,
+ sizeof(*ctl_addr)) < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "daemon_open : control connect failed, "
+ "errno = %d\n", -err);
+ goto out;
+ }
+
+ fd = socket(AF_UNIX, SOCK_DGRAM, 0);
+ if (fd < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "daemon_open : data socket failed, "
+ "errno = %d\n", -err);
+ goto out;
+ }
+ if (bind(fd, (struct sockaddr *) local_addr, sizeof(*local_addr)) < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "daemon_open : data bind failed, "
+ "errno = %d\n", -err);
+ goto out_close;
+ }
+
+ sun = uml_kmalloc(sizeof(struct sockaddr_un), UM_GFP_KERNEL);
+ if (sun == NULL) {
+ printk(UM_KERN_ERR "new_addr: allocation of sockaddr_un "
+ "failed\n");
+ err = -ENOMEM;
+ goto out_close;
+ }
+
+ req.magic = SWITCH_MAGIC;
+ req.version = SWITCH_VERSION;
+ req.type = REQ_NEW_CONTROL;
+ req.sock = *local_addr;
+ n = write(pri->control, &req, sizeof(req));
+ if (n != sizeof(req)) {
+ printk(UM_KERN_ERR "daemon_open : control setup request "
+ "failed, err = %d\n", -errno);
+ err = -ENOTCONN;
+ goto out_free;
+ }
+
+ n = read(pri->control, sun, sizeof(*sun));
+ if (n != sizeof(*sun)) {
+ printk(UM_KERN_ERR "daemon_open : read of data socket failed, "
+ "err = %d\n", -errno);
+ err = -ENOTCONN;
+ goto out_free;
+ }
+
+ pri->data_addr = sun;
+ return fd;
+
+ out_free:
+ kfree(sun);
+ out_close:
+ close(fd);
+ out:
+ close(pri->control);
+ return err;
+}
+
+static int daemon_user_init(void *data, void *dev)
+{
+ struct daemon_data *pri = data;
+ struct timeval tv;
+ struct {
+ char zero;
+ int pid;
+ int usecs;
+ } name;
+
+ if (!strcmp(pri->sock_type, "unix"))
+ pri->ctl_addr = new_addr(pri->ctl_sock,
+ strlen(pri->ctl_sock) + 1);
+ name.zero = 0;
+ name.pid = os_getpid();
+ gettimeofday(&tv, NULL);
+ name.usecs = tv.tv_usec;
+ pri->local_addr = new_addr(&name, sizeof(name));
+ pri->dev = dev;
+ pri->fd = connect_to_switch(pri);
+ if (pri->fd < 0) {
+ kfree(pri->local_addr);
+ pri->local_addr = NULL;
+ return pri->fd;
+ }
+
+ return 0;
+}
+
+static int daemon_open(void *data)
+{
+ struct daemon_data *pri = data;
+ return pri->fd;
+}
+
+static void daemon_remove(void *data)
+{
+ struct daemon_data *pri = data;
+
+ close(pri->fd);
+ pri->fd = -1;
+ close(pri->control);
+ pri->control = -1;
+
+ kfree(pri->data_addr);
+ pri->data_addr = NULL;
+ kfree(pri->ctl_addr);
+ pri->ctl_addr = NULL;
+ kfree(pri->local_addr);
+ pri->local_addr = NULL;
+}
+
+int daemon_user_write(int fd, void *buf, int len, struct daemon_data *pri)
+{
+ struct sockaddr_un *data_addr = pri->data_addr;
+
+ return net_sendto(fd, buf, len, data_addr, sizeof(*data_addr));
+}
+
+const struct net_user_info daemon_user_info = {
+ .init = daemon_user_init,
+ .open = daemon_open,
+ .close = NULL,
+ .remove = daemon_remove,
+ .add_address = NULL,
+ .delete_address = NULL,
+ .mtu = ETH_MAX_PACKET,
+ .max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
+};
diff --git a/arch/um/drivers/fd.c b/arch/um/drivers/fd.c
new file mode 100644
index 0000000..a13a427
--- /dev/null
+++ b/arch/um/drivers/fd.c
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <termios.h>
+#include "chan_user.h"
+#include <os.h>
+#include <um_malloc.h>
+
+struct fd_chan {
+ int fd;
+ int raw;
+ struct termios tt;
+ char str[sizeof("1234567890\0")];
+};
+
+static void *fd_init(char *str, int device, const struct chan_opts *opts)
+{
+ struct fd_chan *data;
+ char *end;
+ int n;
+
+ if (*str != ':') {
+ printk(UM_KERN_ERR "fd_init : channel type 'fd' must specify a "
+ "file descriptor\n");
+ return NULL;
+ }
+ str++;
+ n = strtoul(str, &end, 0);
+ if ((*end != '\0') || (end == str)) {
+ printk(UM_KERN_ERR "fd_init : couldn't parse file descriptor "
+ "'%s'\n", str);
+ return NULL;
+ }
+
+ data = uml_kmalloc(sizeof(*data), UM_GFP_KERNEL);
+ if (data == NULL)
+ return NULL;
+
+ *data = ((struct fd_chan) { .fd = n,
+ .raw = opts->raw });
+ return data;
+}
+
+static int fd_open(int input, int output, int primary, void *d, char **dev_out)
+{
+ struct fd_chan *data = d;
+ int err;
+
+ if (data->raw && isatty(data->fd)) {
+ CATCH_EINTR(err = tcgetattr(data->fd, &data->tt));
+ if (err)
+ return err;
+
+ err = raw(data->fd);
+ if (err)
+ return err;
+ }
+ sprintf(data->str, "%d", data->fd);
+ *dev_out = data->str;
+ return data->fd;
+}
+
+static void fd_close(int fd, void *d)
+{
+ struct fd_chan *data = d;
+ int err;
+
+ if (!data->raw || !isatty(fd))
+ return;
+
+ CATCH_EINTR(err = tcsetattr(fd, TCSAFLUSH, &data->tt));
+ if (err)
+ printk(UM_KERN_ERR "Failed to restore terminal state - "
+ "errno = %d\n", -err);
+ data->raw = 0;
+}
+
+const struct chan_ops fd_ops = {
+ .type = "fd",
+ .init = fd_init,
+ .open = fd_open,
+ .close = fd_close,
+ .read = generic_read,
+ .write = generic_write,
+ .console_write = generic_console_write,
+ .window_size = generic_window_size,
+ .free = generic_free,
+ .winch = 1,
+};
diff --git a/arch/um/drivers/harddog_kern.c b/arch/um/drivers/harddog_kern.c
new file mode 100644
index 0000000..2d0266d
--- /dev/null
+++ b/arch/um/drivers/harddog_kern.c
@@ -0,0 +1,201 @@
+/* UML hardware watchdog, shamelessly stolen from:
+ *
+ * SoftDog 0.05: A Software Watchdog Device
+ *
+ * (c) Copyright 1996 Alan Cox <alan@redhat.com>, All Rights Reserved.
+ * http://www.redhat.com
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
+ * warranty for any of this software. This material is provided
+ * "AS-IS" and at no charge.
+ *
+ * (c) Copyright 1995 Alan Cox <alan@lxorguk.ukuu.org.uk>
+ *
+ * Software only watchdog driver. Unlike its big brother the WDT501P
+ * driver this won't always recover a failed machine.
+ *
+ * 03/96: Angelo Haritsis <ah@doc.ic.ac.uk> :
+ * Modularised.
+ * Added soft_margin; use upon insmod to change the timer delay.
+ * NB: uses same minor as wdt (WATCHDOG_MINOR); we could use separate
+ * minors.
+ *
+ * 19980911 Alan Cox
+ * Made SMP safe for 2.3.x
+ *
+ * 20011127 Joel Becker (jlbec@evilplan.org>
+ * Added soft_noboot; Allows testing the softdog trigger without
+ * requiring a recompile.
+ * Added WDIOC_GETTIMEOUT and WDIOC_SETTIMOUT.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/reboot.h>
+#include <linux/mutex.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <asm/uaccess.h>
+#include "mconsole.h"
+
+MODULE_LICENSE("GPL");
+
+static DEFINE_MUTEX(harddog_mutex);
+static DEFINE_SPINLOCK(lock);
+static int timer_alive;
+static int harddog_in_fd = -1;
+static int harddog_out_fd = -1;
+
+/*
+ * Allow only one person to hold it open
+ */
+
+extern int start_watchdog(int *in_fd_ret, int *out_fd_ret, char *sock);
+
+static int harddog_open(struct inode *inode, struct file *file)
+{
+ int err = -EBUSY;
+ char *sock = NULL;
+
+ mutex_lock(&harddog_mutex);
+ spin_lock(&lock);
+ if(timer_alive)
+ goto err;
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+ __module_get(THIS_MODULE);
+#endif
+
+#ifdef CONFIG_MCONSOLE
+ sock = mconsole_notify_socket();
+#endif
+ err = start_watchdog(&harddog_in_fd, &harddog_out_fd, sock);
+ if(err)
+ goto err;
+
+ timer_alive = 1;
+ spin_unlock(&lock);
+ mutex_unlock(&harddog_mutex);
+ return nonseekable_open(inode, file);
+err:
+ spin_unlock(&lock);
+ mutex_unlock(&harddog_mutex);
+ return err;
+}
+
+extern void stop_watchdog(int in_fd, int out_fd);
+
+static int harddog_release(struct inode *inode, struct file *file)
+{
+ /*
+ * Shut off the timer.
+ */
+
+ spin_lock(&lock);
+
+ stop_watchdog(harddog_in_fd, harddog_out_fd);
+ harddog_in_fd = -1;
+ harddog_out_fd = -1;
+
+ timer_alive=0;
+ spin_unlock(&lock);
+
+ return 0;
+}
+
+extern int ping_watchdog(int fd);
+
+static ssize_t harddog_write(struct file *file, const char __user *data, size_t len,
+ loff_t *ppos)
+{
+ /*
+ * Refresh the timer.
+ */
+ if(len)
+ return ping_watchdog(harddog_out_fd);
+ return 0;
+}
+
+static int harddog_ioctl_unlocked(struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ void __user *argp= (void __user *)arg;
+ static struct watchdog_info ident = {
+ WDIOC_SETTIMEOUT,
+ 0,
+ "UML Hardware Watchdog"
+ };
+ switch (cmd) {
+ default:
+ return -ENOTTY;
+ case WDIOC_GETSUPPORT:
+ if(copy_to_user(argp, &ident, sizeof(ident)))
+ return -EFAULT;
+ return 0;
+ case WDIOC_GETSTATUS:
+ case WDIOC_GETBOOTSTATUS:
+ return put_user(0,(int __user *)argp);
+ case WDIOC_KEEPALIVE:
+ return ping_watchdog(harddog_out_fd);
+ }
+}
+
+static long harddog_ioctl(struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ long ret;
+
+ mutex_lock(&harddog_mutex);
+ ret = harddog_ioctl_unlocked(file, cmd, arg);
+ mutex_unlock(&harddog_mutex);
+
+ return ret;
+}
+
+static const struct file_operations harddog_fops = {
+ .owner = THIS_MODULE,
+ .write = harddog_write,
+ .unlocked_ioctl = harddog_ioctl,
+ .open = harddog_open,
+ .release = harddog_release,
+ .llseek = no_llseek,
+};
+
+static struct miscdevice harddog_miscdev = {
+ .minor = WATCHDOG_MINOR,
+ .name = "watchdog",
+ .fops = &harddog_fops,
+};
+
+static char banner[] __initdata = KERN_INFO "UML Watchdog Timer\n";
+
+static int __init harddog_init(void)
+{
+ int ret;
+
+ ret = misc_register(&harddog_miscdev);
+
+ if (ret)
+ return ret;
+
+ printk(banner);
+
+ return 0;
+}
+
+static void __exit harddog_exit(void)
+{
+ misc_deregister(&harddog_miscdev);
+}
+
+module_init(harddog_init);
+module_exit(harddog_exit);
diff --git a/arch/um/drivers/harddog_user.c b/arch/um/drivers/harddog_user.c
new file mode 100644
index 0000000..3aa8b0d
--- /dev/null
+++ b/arch/um/drivers/harddog_user.c
@@ -0,0 +1,127 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <os.h>
+
+struct dog_data {
+ int stdin_fd;
+ int stdout_fd;
+ int close_me[2];
+};
+
+static void pre_exec(void *d)
+{
+ struct dog_data *data = d;
+
+ dup2(data->stdin_fd, 0);
+ dup2(data->stdout_fd, 1);
+ dup2(data->stdout_fd, 2);
+ close(data->stdin_fd);
+ close(data->stdout_fd);
+ close(data->close_me[0]);
+ close(data->close_me[1]);
+}
+
+int start_watchdog(int *in_fd_ret, int *out_fd_ret, char *sock)
+{
+ struct dog_data data;
+ int in_fds[2], out_fds[2], pid, n, err;
+ char pid_buf[sizeof("nnnnnnn\0")], c;
+ char *pid_args[] = { "/usr/bin/uml_watchdog", "-pid", pid_buf, NULL };
+ char *mconsole_args[] = { "/usr/bin/uml_watchdog", "-mconsole", NULL,
+ NULL };
+ char **args = NULL;
+
+ err = os_pipe(in_fds, 1, 0);
+ if (err < 0) {
+ printk("harddog_open - os_pipe failed, err = %d\n", -err);
+ goto out;
+ }
+
+ err = os_pipe(out_fds, 1, 0);
+ if (err < 0) {
+ printk("harddog_open - os_pipe failed, err = %d\n", -err);
+ goto out_close_in;
+ }
+
+ data.stdin_fd = out_fds[0];
+ data.stdout_fd = in_fds[1];
+ data.close_me[0] = out_fds[1];
+ data.close_me[1] = in_fds[0];
+
+ if (sock != NULL) {
+ mconsole_args[2] = sock;
+ args = mconsole_args;
+ }
+ else {
+ /* XXX The os_getpid() is not SMP correct */
+ sprintf(pid_buf, "%d", os_getpid());
+ args = pid_args;
+ }
+
+ pid = run_helper(pre_exec, &data, args);
+
+ close(out_fds[0]);
+ close(in_fds[1]);
+
+ if (pid < 0) {
+ err = -pid;
+ printk("harddog_open - run_helper failed, errno = %d\n", -err);
+ goto out_close_out;
+ }
+
+ n = read(in_fds[0], &c, sizeof(c));
+ if (n == 0) {
+ printk("harddog_open - EOF on watchdog pipe\n");
+ helper_wait(pid);
+ err = -EIO;
+ goto out_close_out;
+ }
+ else if (n < 0) {
+ printk("harddog_open - read of watchdog pipe failed, "
+ "err = %d\n", errno);
+ helper_wait(pid);
+ err = n;
+ goto out_close_out;
+ }
+ *in_fd_ret = in_fds[0];
+ *out_fd_ret = out_fds[1];
+ return 0;
+
+ out_close_in:
+ close(in_fds[0]);
+ close(in_fds[1]);
+ out_close_out:
+ close(out_fds[0]);
+ close(out_fds[1]);
+ out:
+ return err;
+}
+
+void stop_watchdog(int in_fd, int out_fd)
+{
+ close(in_fd);
+ close(out_fd);
+}
+
+int ping_watchdog(int fd)
+{
+ int n;
+ char c = '\n';
+
+ n = write(fd, &c, sizeof(c));
+ if (n != sizeof(c)) {
+ printk("ping_watchdog - write failed, ret = %d, err = %d\n",
+ n, errno);
+ if (n < 0)
+ return n;
+ return -EIO;
+ }
+ return 1;
+
+}
diff --git a/arch/um/drivers/hostaudio_kern.c b/arch/um/drivers/hostaudio_kern.c
new file mode 100644
index 0000000..f6b911c
--- /dev/null
+++ b/arch/um/drivers/hostaudio_kern.c
@@ -0,0 +1,358 @@
+/*
+ * Copyright (C) 2002 Steve Schmidtke
+ * Licensed under the GPL
+ */
+
+#include <linux/fs.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/sound.h>
+#include <linux/soundcard.h>
+#include <linux/mutex.h>
+#include <asm/uaccess.h>
+#include <init.h>
+#include <os.h>
+
+struct hostaudio_state {
+ int fd;
+};
+
+struct hostmixer_state {
+ int fd;
+};
+
+#define HOSTAUDIO_DEV_DSP "/dev/sound/dsp"
+#define HOSTAUDIO_DEV_MIXER "/dev/sound/mixer"
+
+/*
+ * Changed either at boot time or module load time. At boot, this is
+ * single-threaded; at module load, multiple modules would each have
+ * their own copy of these variables.
+ */
+static char *dsp = HOSTAUDIO_DEV_DSP;
+static char *mixer = HOSTAUDIO_DEV_MIXER;
+
+#define DSP_HELP \
+" This is used to specify the host dsp device to the hostaudio driver.\n" \
+" The default is \"" HOSTAUDIO_DEV_DSP "\".\n\n"
+
+#define MIXER_HELP \
+" This is used to specify the host mixer device to the hostaudio driver.\n"\
+" The default is \"" HOSTAUDIO_DEV_MIXER "\".\n\n"
+
+module_param(dsp, charp, 0644);
+MODULE_PARM_DESC(dsp, DSP_HELP);
+module_param(mixer, charp, 0644);
+MODULE_PARM_DESC(mixer, MIXER_HELP);
+
+#ifndef MODULE
+static int set_dsp(char *name, int *add)
+{
+ dsp = name;
+ return 0;
+}
+
+__uml_setup("dsp=", set_dsp, "dsp=<dsp device>\n" DSP_HELP);
+
+static int set_mixer(char *name, int *add)
+{
+ mixer = name;
+ return 0;
+}
+
+__uml_setup("mixer=", set_mixer, "mixer=<mixer device>\n" MIXER_HELP);
+#endif
+
+static DEFINE_MUTEX(hostaudio_mutex);
+
+/* /dev/dsp file operations */
+
+static ssize_t hostaudio_read(struct file *file, char __user *buffer,
+ size_t count, loff_t *ppos)
+{
+ struct hostaudio_state *state = file->private_data;
+ void *kbuf;
+ int err;
+
+#ifdef DEBUG
+ printk(KERN_DEBUG "hostaudio: read called, count = %d\n", count);
+#endif
+
+ kbuf = kmalloc(count, GFP_KERNEL);
+ if (kbuf == NULL)
+ return -ENOMEM;
+
+ err = os_read_file(state->fd, kbuf, count);
+ if (err < 0)
+ goto out;
+
+ if (copy_to_user(buffer, kbuf, err))
+ err = -EFAULT;
+
+out:
+ kfree(kbuf);
+ return err;
+}
+
+static ssize_t hostaudio_write(struct file *file, const char __user *buffer,
+ size_t count, loff_t *ppos)
+{
+ struct hostaudio_state *state = file->private_data;
+ void *kbuf;
+ int err;
+
+#ifdef DEBUG
+ printk(KERN_DEBUG "hostaudio: write called, count = %d\n", count);
+#endif
+
+ kbuf = kmalloc(count, GFP_KERNEL);
+ if (kbuf == NULL)
+ return -ENOMEM;
+
+ err = -EFAULT;
+ if (copy_from_user(kbuf, buffer, count))
+ goto out;
+
+ err = os_write_file(state->fd, kbuf, count);
+ if (err < 0)
+ goto out;
+ *ppos += err;
+
+ out:
+ kfree(kbuf);
+ return err;
+}
+
+static unsigned int hostaudio_poll(struct file *file,
+ struct poll_table_struct *wait)
+{
+ unsigned int mask = 0;
+
+#ifdef DEBUG
+ printk(KERN_DEBUG "hostaudio: poll called (unimplemented)\n");
+#endif
+
+ return mask;
+}
+
+static long hostaudio_ioctl(struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ struct hostaudio_state *state = file->private_data;
+ unsigned long data = 0;
+ int err;
+
+#ifdef DEBUG
+ printk(KERN_DEBUG "hostaudio: ioctl called, cmd = %u\n", cmd);
+#endif
+ switch(cmd){
+ case SNDCTL_DSP_SPEED:
+ case SNDCTL_DSP_STEREO:
+ case SNDCTL_DSP_GETBLKSIZE:
+ case SNDCTL_DSP_CHANNELS:
+ case SNDCTL_DSP_SUBDIVIDE:
+ case SNDCTL_DSP_SETFRAGMENT:
+ if (get_user(data, (int __user *) arg))
+ return -EFAULT;
+ break;
+ default:
+ break;
+ }
+
+ err = os_ioctl_generic(state->fd, cmd, (unsigned long) &data);
+
+ switch(cmd){
+ case SNDCTL_DSP_SPEED:
+ case SNDCTL_DSP_STEREO:
+ case SNDCTL_DSP_GETBLKSIZE:
+ case SNDCTL_DSP_CHANNELS:
+ case SNDCTL_DSP_SUBDIVIDE:
+ case SNDCTL_DSP_SETFRAGMENT:
+ if (put_user(data, (int __user *) arg))
+ return -EFAULT;
+ break;
+ default:
+ break;
+ }
+
+ return err;
+}
+
+static int hostaudio_open(struct inode *inode, struct file *file)
+{
+ struct hostaudio_state *state;
+ int r = 0, w = 0;
+ int ret;
+
+#ifdef DEBUG
+ kernel_param_lock(THIS_MODULE);
+ printk(KERN_DEBUG "hostaudio: open called (host: %s)\n", dsp);
+ kernel_param_unlock(THIS_MODULE);
+#endif
+
+ state = kmalloc(sizeof(struct hostaudio_state), GFP_KERNEL);
+ if (state == NULL)
+ return -ENOMEM;
+
+ if (file->f_mode & FMODE_READ)
+ r = 1;
+ if (file->f_mode & FMODE_WRITE)
+ w = 1;
+
+ kernel_param_lock(THIS_MODULE);
+ mutex_lock(&hostaudio_mutex);
+ ret = os_open_file(dsp, of_set_rw(OPENFLAGS(), r, w), 0);
+ mutex_unlock(&hostaudio_mutex);
+ kernel_param_unlock(THIS_MODULE);
+
+ if (ret < 0) {
+ kfree(state);
+ return ret;
+ }
+ state->fd = ret;
+ file->private_data = state;
+ return 0;
+}
+
+static int hostaudio_release(struct inode *inode, struct file *file)
+{
+ struct hostaudio_state *state = file->private_data;
+
+#ifdef DEBUG
+ printk(KERN_DEBUG "hostaudio: release called\n");
+#endif
+ os_close_file(state->fd);
+ kfree(state);
+
+ return 0;
+}
+
+/* /dev/mixer file operations */
+
+static long hostmixer_ioctl_mixdev(struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ struct hostmixer_state *state = file->private_data;
+
+#ifdef DEBUG
+ printk(KERN_DEBUG "hostmixer: ioctl called\n");
+#endif
+
+ return os_ioctl_generic(state->fd, cmd, arg);
+}
+
+static int hostmixer_open_mixdev(struct inode *inode, struct file *file)
+{
+ struct hostmixer_state *state;
+ int r = 0, w = 0;
+ int ret;
+
+#ifdef DEBUG
+ printk(KERN_DEBUG "hostmixer: open called (host: %s)\n", mixer);
+#endif
+
+ state = kmalloc(sizeof(struct hostmixer_state), GFP_KERNEL);
+ if (state == NULL)
+ return -ENOMEM;
+
+ if (file->f_mode & FMODE_READ)
+ r = 1;
+ if (file->f_mode & FMODE_WRITE)
+ w = 1;
+
+ kernel_param_lock(THIS_MODULE);
+ mutex_lock(&hostaudio_mutex);
+ ret = os_open_file(mixer, of_set_rw(OPENFLAGS(), r, w), 0);
+ mutex_unlock(&hostaudio_mutex);
+ kernel_param_unlock(THIS_MODULE);
+
+ if (ret < 0) {
+ kernel_param_lock(THIS_MODULE);
+ printk(KERN_ERR "hostaudio_open_mixdev failed to open '%s', "
+ "err = %d\n", dsp, -ret);
+ kernel_param_unlock(THIS_MODULE);
+ kfree(state);
+ return ret;
+ }
+
+ file->private_data = state;
+ return 0;
+}
+
+static int hostmixer_release(struct inode *inode, struct file *file)
+{
+ struct hostmixer_state *state = file->private_data;
+
+#ifdef DEBUG
+ printk(KERN_DEBUG "hostmixer: release called\n");
+#endif
+
+ os_close_file(state->fd);
+ kfree(state);
+
+ return 0;
+}
+
+/* kernel module operations */
+
+static const struct file_operations hostaudio_fops = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .read = hostaudio_read,
+ .write = hostaudio_write,
+ .poll = hostaudio_poll,
+ .unlocked_ioctl = hostaudio_ioctl,
+ .mmap = NULL,
+ .open = hostaudio_open,
+ .release = hostaudio_release,
+};
+
+static const struct file_operations hostmixer_fops = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .unlocked_ioctl = hostmixer_ioctl_mixdev,
+ .open = hostmixer_open_mixdev,
+ .release = hostmixer_release,
+};
+
+struct {
+ int dev_audio;
+ int dev_mixer;
+} module_data;
+
+MODULE_AUTHOR("Steve Schmidtke");
+MODULE_DESCRIPTION("UML Audio Relay");
+MODULE_LICENSE("GPL");
+
+static int __init hostaudio_init_module(void)
+{
+ kernel_param_lock(THIS_MODULE);
+ printk(KERN_INFO "UML Audio Relay (host dsp = %s, host mixer = %s)\n",
+ dsp, mixer);
+ kernel_param_unlock(THIS_MODULE);
+
+ module_data.dev_audio = register_sound_dsp(&hostaudio_fops, -1);
+ if (module_data.dev_audio < 0) {
+ printk(KERN_ERR "hostaudio: couldn't register DSP device!\n");
+ return -ENODEV;
+ }
+
+ module_data.dev_mixer = register_sound_mixer(&hostmixer_fops, -1);
+ if (module_data.dev_mixer < 0) {
+ printk(KERN_ERR "hostmixer: couldn't register mixer "
+ "device!\n");
+ unregister_sound_dsp(module_data.dev_audio);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static void __exit hostaudio_cleanup_module (void)
+{
+ unregister_sound_mixer(module_data.dev_mixer);
+ unregister_sound_dsp(module_data.dev_audio);
+}
+
+module_init(hostaudio_init_module);
+module_exit(hostaudio_cleanup_module);
diff --git a/arch/um/drivers/line.c b/arch/um/drivers/line.c
new file mode 100644
index 0000000..6208702
--- /dev/null
+++ b/arch/um/drivers/line.c
@@ -0,0 +1,768 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/irqreturn.h>
+#include <linux/kd.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include "chan.h"
+#include <irq_kern.h>
+#include <irq_user.h>
+#include <kern_util.h>
+#include <os.h>
+
+#define LINE_BUFSIZE 4096
+
+static irqreturn_t line_interrupt(int irq, void *data)
+{
+ struct chan *chan = data;
+ struct line *line = chan->line;
+
+ if (line)
+ chan_interrupt(line, irq);
+
+ return IRQ_HANDLED;
+}
+
+/*
+ * Returns the free space inside the ring buffer of this line.
+ *
+ * Should be called while holding line->lock (this does not modify data).
+ */
+static int write_room(struct line *line)
+{
+ int n;
+
+ if (line->buffer == NULL)
+ return LINE_BUFSIZE - 1;
+
+ /* This is for the case where the buffer is wrapped! */
+ n = line->head - line->tail;
+
+ if (n <= 0)
+ n += LINE_BUFSIZE; /* The other case */
+ return n - 1;
+}
+
+int line_write_room(struct tty_struct *tty)
+{
+ struct line *line = tty->driver_data;
+ unsigned long flags;
+ int room;
+
+ spin_lock_irqsave(&line->lock, flags);
+ room = write_room(line);
+ spin_unlock_irqrestore(&line->lock, flags);
+
+ return room;
+}
+
+int line_chars_in_buffer(struct tty_struct *tty)
+{
+ struct line *line = tty->driver_data;
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&line->lock, flags);
+ /* write_room subtracts 1 for the needed NULL, so we readd it.*/
+ ret = LINE_BUFSIZE - (write_room(line) + 1);
+ spin_unlock_irqrestore(&line->lock, flags);
+
+ return ret;
+}
+
+/*
+ * This copies the content of buf into the circular buffer associated with
+ * this line.
+ * The return value is the number of characters actually copied, i.e. the ones
+ * for which there was space: this function is not supposed to ever flush out
+ * the circular buffer.
+ *
+ * Must be called while holding line->lock!
+ */
+static int buffer_data(struct line *line, const char *buf, int len)
+{
+ int end, room;
+
+ if (line->buffer == NULL) {
+ line->buffer = kmalloc(LINE_BUFSIZE, GFP_ATOMIC);
+ if (line->buffer == NULL) {
+ printk(KERN_ERR "buffer_data - atomic allocation "
+ "failed\n");
+ return 0;
+ }
+ line->head = line->buffer;
+ line->tail = line->buffer;
+ }
+
+ room = write_room(line);
+ len = (len > room) ? room : len;
+
+ end = line->buffer + LINE_BUFSIZE - line->tail;
+
+ if (len < end) {
+ memcpy(line->tail, buf, len);
+ line->tail += len;
+ }
+ else {
+ /* The circular buffer is wrapping */
+ memcpy(line->tail, buf, end);
+ buf += end;
+ memcpy(line->buffer, buf, len - end);
+ line->tail = line->buffer + len - end;
+ }
+
+ return len;
+}
+
+/*
+ * Flushes the ring buffer to the output channels. That is, write_chan is
+ * called, passing it line->head as buffer, and an appropriate count.
+ *
+ * On exit, returns 1 when the buffer is empty,
+ * 0 when the buffer is not empty on exit,
+ * and -errno when an error occurred.
+ *
+ * Must be called while holding line->lock!*/
+static int flush_buffer(struct line *line)
+{
+ int n, count;
+
+ if ((line->buffer == NULL) || (line->head == line->tail))
+ return 1;
+
+ if (line->tail < line->head) {
+ /* line->buffer + LINE_BUFSIZE is the end of the buffer! */
+ count = line->buffer + LINE_BUFSIZE - line->head;
+
+ n = write_chan(line->chan_out, line->head, count,
+ line->driver->write_irq);
+ if (n < 0)
+ return n;
+ if (n == count) {
+ /*
+ * We have flushed from ->head to buffer end, now we
+ * must flush only from the beginning to ->tail.
+ */
+ line->head = line->buffer;
+ } else {
+ line->head += n;
+ return 0;
+ }
+ }
+
+ count = line->tail - line->head;
+ n = write_chan(line->chan_out, line->head, count,
+ line->driver->write_irq);
+
+ if (n < 0)
+ return n;
+
+ line->head += n;
+ return line->head == line->tail;
+}
+
+void line_flush_buffer(struct tty_struct *tty)
+{
+ struct line *line = tty->driver_data;
+ unsigned long flags;
+
+ spin_lock_irqsave(&line->lock, flags);
+ flush_buffer(line);
+ spin_unlock_irqrestore(&line->lock, flags);
+}
+
+/*
+ * We map both ->flush_chars and ->put_char (which go in pair) onto
+ * ->flush_buffer and ->write. Hope it's not that bad.
+ */
+void line_flush_chars(struct tty_struct *tty)
+{
+ line_flush_buffer(tty);
+}
+
+int line_put_char(struct tty_struct *tty, unsigned char ch)
+{
+ return line_write(tty, &ch, sizeof(ch));
+}
+
+int line_write(struct tty_struct *tty, const unsigned char *buf, int len)
+{
+ struct line *line = tty->driver_data;
+ unsigned long flags;
+ int n, ret = 0;
+
+ spin_lock_irqsave(&line->lock, flags);
+ if (line->head != line->tail)
+ ret = buffer_data(line, buf, len);
+ else {
+ n = write_chan(line->chan_out, buf, len,
+ line->driver->write_irq);
+ if (n < 0) {
+ ret = n;
+ goto out_up;
+ }
+
+ len -= n;
+ ret += n;
+ if (len > 0)
+ ret += buffer_data(line, buf + n, len);
+ }
+out_up:
+ spin_unlock_irqrestore(&line->lock, flags);
+ return ret;
+}
+
+void line_set_termios(struct tty_struct *tty, struct ktermios * old)
+{
+ /* nothing */
+}
+
+void line_throttle(struct tty_struct *tty)
+{
+ struct line *line = tty->driver_data;
+
+ deactivate_chan(line->chan_in, line->driver->read_irq);
+ line->throttled = 1;
+}
+
+void line_unthrottle(struct tty_struct *tty)
+{
+ struct line *line = tty->driver_data;
+
+ line->throttled = 0;
+ chan_interrupt(line, line->driver->read_irq);
+
+ /*
+ * Maybe there is enough stuff pending that calling the interrupt
+ * throttles us again. In this case, line->throttled will be 1
+ * again and we shouldn't turn the interrupt back on.
+ */
+ if (!line->throttled)
+ reactivate_chan(line->chan_in, line->driver->read_irq);
+}
+
+static irqreturn_t line_write_interrupt(int irq, void *data)
+{
+ struct chan *chan = data;
+ struct line *line = chan->line;
+ int err;
+
+ /*
+ * Interrupts are disabled here because genirq keep irqs disabled when
+ * calling the action handler.
+ */
+
+ spin_lock(&line->lock);
+ err = flush_buffer(line);
+ if (err == 0) {
+ spin_unlock(&line->lock);
+ return IRQ_NONE;
+ } else if (err < 0) {
+ line->head = line->buffer;
+ line->tail = line->buffer;
+ }
+ spin_unlock(&line->lock);
+
+ tty_port_tty_wakeup(&line->port);
+
+ return IRQ_HANDLED;
+}
+
+int line_setup_irq(int fd, int input, int output, struct line *line, void *data)
+{
+ const struct line_driver *driver = line->driver;
+ int err = 0;
+
+ if (input)
+ err = um_request_irq(driver->read_irq, fd, IRQ_READ,
+ line_interrupt, IRQF_SHARED,
+ driver->read_irq_name, data);
+ if (err)
+ return err;
+ if (output)
+ err = um_request_irq(driver->write_irq, fd, IRQ_WRITE,
+ line_write_interrupt, IRQF_SHARED,
+ driver->write_irq_name, data);
+ return err;
+}
+
+static int line_activate(struct tty_port *port, struct tty_struct *tty)
+{
+ int ret;
+ struct line *line = tty->driver_data;
+
+ ret = enable_chan(line);
+ if (ret)
+ return ret;
+
+ if (!line->sigio) {
+ chan_enable_winch(line->chan_out, port);
+ line->sigio = 1;
+ }
+
+ chan_window_size(line, &tty->winsize.ws_row,
+ &tty->winsize.ws_col);
+
+ return 0;
+}
+
+static void unregister_winch(struct tty_struct *tty);
+
+static void line_destruct(struct tty_port *port)
+{
+ struct tty_struct *tty = tty_port_tty_get(port);
+ struct line *line = tty->driver_data;
+
+ if (line->sigio) {
+ unregister_winch(tty);
+ line->sigio = 0;
+ }
+}
+
+static const struct tty_port_operations line_port_ops = {
+ .activate = line_activate,
+ .destruct = line_destruct,
+};
+
+int line_open(struct tty_struct *tty, struct file *filp)
+{
+ struct line *line = tty->driver_data;
+
+ return tty_port_open(&line->port, tty, filp);
+}
+
+int line_install(struct tty_driver *driver, struct tty_struct *tty,
+ struct line *line)
+{
+ int ret;
+
+ ret = tty_standard_install(driver, tty);
+ if (ret)
+ return ret;
+
+ tty->driver_data = line;
+
+ return 0;
+}
+
+void line_close(struct tty_struct *tty, struct file * filp)
+{
+ struct line *line = tty->driver_data;
+
+ tty_port_close(&line->port, tty, filp);
+}
+
+void line_hangup(struct tty_struct *tty)
+{
+ struct line *line = tty->driver_data;
+
+ tty_port_hangup(&line->port);
+}
+
+void close_lines(struct line *lines, int nlines)
+{
+ int i;
+
+ for(i = 0; i < nlines; i++)
+ close_chan(&lines[i]);
+}
+
+int setup_one_line(struct line *lines, int n, char *init,
+ const struct chan_opts *opts, char **error_out)
+{
+ struct line *line = &lines[n];
+ struct tty_driver *driver = line->driver->driver;
+ int err = -EINVAL;
+
+ if (line->port.count) {
+ *error_out = "Device is already open";
+ goto out;
+ }
+
+ if (!strcmp(init, "none")) {
+ if (line->valid) {
+ line->valid = 0;
+ kfree(line->init_str);
+ tty_unregister_device(driver, n);
+ parse_chan_pair(NULL, line, n, opts, error_out);
+ err = 0;
+ }
+ } else {
+ char *new = kstrdup(init, GFP_KERNEL);
+ if (!new) {
+ *error_out = "Failed to allocate memory";
+ return -ENOMEM;
+ }
+ if (line->valid) {
+ tty_unregister_device(driver, n);
+ kfree(line->init_str);
+ }
+ line->init_str = new;
+ line->valid = 1;
+ err = parse_chan_pair(new, line, n, opts, error_out);
+ if (!err) {
+ struct device *d = tty_port_register_device(&line->port,
+ driver, n, NULL);
+ if (IS_ERR(d)) {
+ *error_out = "Failed to register device";
+ err = PTR_ERR(d);
+ parse_chan_pair(NULL, line, n, opts, error_out);
+ }
+ }
+ if (err) {
+ line->init_str = NULL;
+ line->valid = 0;
+ kfree(new);
+ }
+ }
+out:
+ return err;
+}
+
+/*
+ * Common setup code for both startup command line and mconsole initialization.
+ * @lines contains the array (of size @num) to modify;
+ * @init is the setup string;
+ * @error_out is an error string in the case of failure;
+ */
+
+int line_setup(char **conf, unsigned int num, char **def,
+ char *init, char *name)
+{
+ char *error;
+
+ if (*init == '=') {
+ /*
+ * We said con=/ssl= instead of con#=, so we are configuring all
+ * consoles at once.
+ */
+ *def = init + 1;
+ } else {
+ char *end;
+ unsigned n = simple_strtoul(init, &end, 0);
+
+ if (*end != '=') {
+ error = "Couldn't parse device number";
+ goto out;
+ }
+ if (n >= num) {
+ error = "Device number out of range";
+ goto out;
+ }
+ conf[n] = end + 1;
+ }
+ return 0;
+
+out:
+ printk(KERN_ERR "Failed to set up %s with "
+ "configuration string \"%s\" : %s\n", name, init, error);
+ return -EINVAL;
+}
+
+int line_config(struct line *lines, unsigned int num, char *str,
+ const struct chan_opts *opts, char **error_out)
+{
+ char *end;
+ int n;
+
+ if (*str == '=') {
+ *error_out = "Can't configure all devices from mconsole";
+ return -EINVAL;
+ }
+
+ n = simple_strtoul(str, &end, 0);
+ if (*end++ != '=') {
+ *error_out = "Couldn't parse device number";
+ return -EINVAL;
+ }
+ if (n >= num) {
+ *error_out = "Device number out of range";
+ return -EINVAL;
+ }
+
+ return setup_one_line(lines, n, end, opts, error_out);
+}
+
+int line_get_config(char *name, struct line *lines, unsigned int num, char *str,
+ int size, char **error_out)
+{
+ struct line *line;
+ char *end;
+ int dev, n = 0;
+
+ dev = simple_strtoul(name, &end, 0);
+ if ((*end != '\0') || (end == name)) {
+ *error_out = "line_get_config failed to parse device number";
+ return 0;
+ }
+
+ if ((dev < 0) || (dev >= num)) {
+ *error_out = "device number out of range";
+ return 0;
+ }
+
+ line = &lines[dev];
+
+ if (!line->valid)
+ CONFIG_CHUNK(str, size, n, "none", 1);
+ else {
+ struct tty_struct *tty = tty_port_tty_get(&line->port);
+ if (tty == NULL) {
+ CONFIG_CHUNK(str, size, n, line->init_str, 1);
+ } else {
+ n = chan_config_string(line, str, size, error_out);
+ tty_kref_put(tty);
+ }
+ }
+
+ return n;
+}
+
+int line_id(char **str, int *start_out, int *end_out)
+{
+ char *end;
+ int n;
+
+ n = simple_strtoul(*str, &end, 0);
+ if ((*end != '\0') || (end == *str))
+ return -1;
+
+ *str = end;
+ *start_out = n;
+ *end_out = n;
+ return n;
+}
+
+int line_remove(struct line *lines, unsigned int num, int n, char **error_out)
+{
+ if (n >= num) {
+ *error_out = "Device number out of range";
+ return -EINVAL;
+ }
+ return setup_one_line(lines, n, "none", NULL, error_out);
+}
+
+int register_lines(struct line_driver *line_driver,
+ const struct tty_operations *ops,
+ struct line *lines, int nlines)
+{
+ struct tty_driver *driver = alloc_tty_driver(nlines);
+ int err;
+ int i;
+
+ if (!driver)
+ return -ENOMEM;
+
+ driver->driver_name = line_driver->name;
+ driver->name = line_driver->device_name;
+ driver->major = line_driver->major;
+ driver->minor_start = line_driver->minor_start;
+ driver->type = line_driver->type;
+ driver->subtype = line_driver->subtype;
+ driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
+ driver->init_termios = tty_std_termios;
+
+ for (i = 0; i < nlines; i++) {
+ tty_port_init(&lines[i].port);
+ lines[i].port.ops = &line_port_ops;
+ spin_lock_init(&lines[i].lock);
+ lines[i].driver = line_driver;
+ INIT_LIST_HEAD(&lines[i].chan_list);
+ }
+ tty_set_operations(driver, ops);
+
+ err = tty_register_driver(driver);
+ if (err) {
+ printk(KERN_ERR "register_lines : can't register %s driver\n",
+ line_driver->name);
+ put_tty_driver(driver);
+ for (i = 0; i < nlines; i++)
+ tty_port_destroy(&lines[i].port);
+ return err;
+ }
+
+ line_driver->driver = driver;
+ mconsole_register_dev(&line_driver->mc);
+ return 0;
+}
+
+static DEFINE_SPINLOCK(winch_handler_lock);
+static LIST_HEAD(winch_handlers);
+
+struct winch {
+ struct list_head list;
+ int fd;
+ int tty_fd;
+ int pid;
+ struct tty_port *port;
+ unsigned long stack;
+ struct work_struct work;
+};
+
+static void __free_winch(struct work_struct *work)
+{
+ struct winch *winch = container_of(work, struct winch, work);
+ um_free_irq(WINCH_IRQ, winch);
+
+ if (winch->pid != -1)
+ os_kill_process(winch->pid, 1);
+ if (winch->stack != 0)
+ free_stack(winch->stack, 0);
+ kfree(winch);
+}
+
+static void free_winch(struct winch *winch)
+{
+ int fd = winch->fd;
+ winch->fd = -1;
+ if (fd != -1)
+ os_close_file(fd);
+ list_del(&winch->list);
+ __free_winch(&winch->work);
+}
+
+static irqreturn_t winch_interrupt(int irq, void *data)
+{
+ struct winch *winch = data;
+ struct tty_struct *tty;
+ struct line *line;
+ int fd = winch->fd;
+ int err;
+ char c;
+ struct pid *pgrp;
+
+ if (fd != -1) {
+ err = generic_read(fd, &c, NULL);
+ if (err < 0) {
+ if (err != -EAGAIN) {
+ winch->fd = -1;
+ list_del(&winch->list);
+ os_close_file(fd);
+ printk(KERN_ERR "winch_interrupt : "
+ "read failed, errno = %d\n", -err);
+ printk(KERN_ERR "fd %d is losing SIGWINCH "
+ "support\n", winch->tty_fd);
+ INIT_WORK(&winch->work, __free_winch);
+ schedule_work(&winch->work);
+ return IRQ_HANDLED;
+ }
+ goto out;
+ }
+ }
+ tty = tty_port_tty_get(winch->port);
+ if (tty != NULL) {
+ line = tty->driver_data;
+ if (line != NULL) {
+ chan_window_size(line, &tty->winsize.ws_row,
+ &tty->winsize.ws_col);
+ pgrp = tty_get_pgrp(tty);
+ if (pgrp)
+ kill_pgrp(pgrp, SIGWINCH, 1);
+ put_pid(pgrp);
+ }
+ tty_kref_put(tty);
+ }
+ out:
+ if (winch->fd != -1)
+ reactivate_fd(winch->fd, WINCH_IRQ);
+ return IRQ_HANDLED;
+}
+
+void register_winch_irq(int fd, int tty_fd, int pid, struct tty_port *port,
+ unsigned long stack)
+{
+ struct winch *winch;
+
+ winch = kmalloc(sizeof(*winch), GFP_KERNEL);
+ if (winch == NULL) {
+ printk(KERN_ERR "register_winch_irq - kmalloc failed\n");
+ goto cleanup;
+ }
+
+ *winch = ((struct winch) { .list = LIST_HEAD_INIT(winch->list),
+ .fd = fd,
+ .tty_fd = tty_fd,
+ .pid = pid,
+ .port = port,
+ .stack = stack });
+
+ if (um_request_irq(WINCH_IRQ, fd, IRQ_READ, winch_interrupt,
+ IRQF_SHARED, "winch", winch) < 0) {
+ printk(KERN_ERR "register_winch_irq - failed to register "
+ "IRQ\n");
+ goto out_free;
+ }
+
+ spin_lock(&winch_handler_lock);
+ list_add(&winch->list, &winch_handlers);
+ spin_unlock(&winch_handler_lock);
+
+ return;
+
+ out_free:
+ kfree(winch);
+ cleanup:
+ os_kill_process(pid, 1);
+ os_close_file(fd);
+ if (stack != 0)
+ free_stack(stack, 0);
+}
+
+static void unregister_winch(struct tty_struct *tty)
+{
+ struct list_head *ele, *next;
+ struct winch *winch;
+ struct tty_struct *wtty;
+
+ spin_lock(&winch_handler_lock);
+
+ list_for_each_safe(ele, next, &winch_handlers) {
+ winch = list_entry(ele, struct winch, list);
+ wtty = tty_port_tty_get(winch->port);
+ if (wtty == tty) {
+ free_winch(winch);
+ break;
+ }
+ tty_kref_put(wtty);
+ }
+ spin_unlock(&winch_handler_lock);
+}
+
+static void winch_cleanup(void)
+{
+ struct list_head *ele, *next;
+ struct winch *winch;
+
+ spin_lock(&winch_handler_lock);
+
+ list_for_each_safe(ele, next, &winch_handlers) {
+ winch = list_entry(ele, struct winch, list);
+ free_winch(winch);
+ }
+
+ spin_unlock(&winch_handler_lock);
+}
+__uml_exitcall(winch_cleanup);
+
+char *add_xterm_umid(char *base)
+{
+ char *umid, *title;
+ int len;
+
+ umid = get_umid();
+ if (*umid == '\0')
+ return base;
+
+ len = strlen(base) + strlen(" ()") + strlen(umid) + 1;
+ title = kmalloc(len, GFP_KERNEL);
+ if (title == NULL) {
+ printk(KERN_ERR "Failed to allocate buffer for xterm title\n");
+ return base;
+ }
+
+ snprintf(title, len, "%s (%s)", base, umid);
+ return title;
+}
diff --git a/arch/um/drivers/line.h b/arch/um/drivers/line.h
new file mode 100644
index 0000000..138a145
--- /dev/null
+++ b/arch/um/drivers/line.h
@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __LINE_H__
+#define __LINE_H__
+
+#include <linux/list.h>
+#include <linux/workqueue.h>
+#include <linux/tty.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/mutex.h>
+#include "chan_user.h"
+#include "mconsole_kern.h"
+
+/* There's only two modifiable fields in this - .mc.list and .driver */
+struct line_driver {
+ const char *name;
+ const char *device_name;
+ const short major;
+ const short minor_start;
+ const short type;
+ const short subtype;
+ const int read_irq;
+ const char *read_irq_name;
+ const int write_irq;
+ const char *write_irq_name;
+ struct mc_device mc;
+ struct tty_driver *driver;
+};
+
+struct line {
+ struct tty_port port;
+ int valid;
+
+ char *init_str;
+ struct list_head chan_list;
+ struct chan *chan_in, *chan_out;
+
+ /*This lock is actually, mostly, local to*/
+ spinlock_t lock;
+ int throttled;
+ /* Yes, this is a real circular buffer.
+ * XXX: And this should become a struct kfifo!
+ *
+ * buffer points to a buffer allocated on demand, of length
+ * LINE_BUFSIZE, head to the start of the ring, tail to the end.*/
+ char *buffer;
+ char *head;
+ char *tail;
+
+ int sigio;
+ struct delayed_work task;
+ const struct line_driver *driver;
+};
+
+extern void line_close(struct tty_struct *tty, struct file * filp);
+extern int line_open(struct tty_struct *tty, struct file *filp);
+extern int line_install(struct tty_driver *driver, struct tty_struct *tty,
+ struct line *line);
+extern void line_cleanup(struct tty_struct *tty);
+extern void line_hangup(struct tty_struct *tty);
+extern int line_setup(char **conf, unsigned nlines, char **def,
+ char *init, char *name);
+extern int line_write(struct tty_struct *tty, const unsigned char *buf,
+ int len);
+extern int line_put_char(struct tty_struct *tty, unsigned char ch);
+extern void line_set_termios(struct tty_struct *tty, struct ktermios * old);
+extern int line_chars_in_buffer(struct tty_struct *tty);
+extern void line_flush_buffer(struct tty_struct *tty);
+extern void line_flush_chars(struct tty_struct *tty);
+extern int line_write_room(struct tty_struct *tty);
+extern void line_throttle(struct tty_struct *tty);
+extern void line_unthrottle(struct tty_struct *tty);
+
+extern char *add_xterm_umid(char *base);
+extern int line_setup_irq(int fd, int input, int output, struct line *line,
+ void *data);
+extern void line_close_chan(struct line *line);
+extern int register_lines(struct line_driver *line_driver,
+ const struct tty_operations *driver,
+ struct line *lines, int nlines);
+extern int setup_one_line(struct line *lines, int n, char *init,
+ const struct chan_opts *opts, char **error_out);
+extern void close_lines(struct line *lines, int nlines);
+
+extern int line_config(struct line *lines, unsigned int sizeof_lines,
+ char *str, const struct chan_opts *opts,
+ char **error_out);
+extern int line_id(char **str, int *start_out, int *end_out);
+extern int line_remove(struct line *lines, unsigned int sizeof_lines, int n,
+ char **error_out);
+extern int line_get_config(char *dev, struct line *lines,
+ unsigned int sizeof_lines, char *str,
+ int size, char **error_out);
+
+#endif
diff --git a/arch/um/drivers/mconsole.h b/arch/um/drivers/mconsole.h
new file mode 100644
index 0000000..44af737
--- /dev/null
+++ b/arch/um/drivers/mconsole.h
@@ -0,0 +1,98 @@
+/*
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org)
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __MCONSOLE_H__
+#define __MCONSOLE_H__
+
+#ifdef __UM_HOST__
+#include <stdint.h>
+#define u32 uint32_t
+#endif
+
+#include <sysdep/ptrace.h>
+
+#define MCONSOLE_MAGIC (0xcafebabe)
+#define MCONSOLE_MAX_DATA (512)
+#define MCONSOLE_VERSION 2
+
+struct mconsole_request {
+ u32 magic;
+ u32 version;
+ u32 len;
+ char data[MCONSOLE_MAX_DATA];
+};
+
+struct mconsole_reply {
+ u32 err;
+ u32 more;
+ u32 len;
+ char data[MCONSOLE_MAX_DATA];
+};
+
+struct mconsole_notify {
+ u32 magic;
+ u32 version;
+ enum { MCONSOLE_SOCKET, MCONSOLE_PANIC, MCONSOLE_HANG,
+ MCONSOLE_USER_NOTIFY } type;
+ u32 len;
+ char data[MCONSOLE_MAX_DATA];
+};
+
+struct mc_request;
+
+enum mc_context { MCONSOLE_INTR, MCONSOLE_PROC };
+
+struct mconsole_command
+{
+ char *command;
+ void (*handler)(struct mc_request *req);
+ enum mc_context context;
+};
+
+struct mc_request
+{
+ int len;
+ int as_interrupt;
+
+ int originating_fd;
+ unsigned int originlen;
+ unsigned char origin[128]; /* sockaddr_un */
+
+ struct mconsole_request request;
+ struct mconsole_command *cmd;
+ struct uml_pt_regs regs;
+};
+
+extern char mconsole_socket_name[];
+
+extern int mconsole_unlink_socket(void);
+extern int mconsole_reply_len(struct mc_request *req, const char *reply,
+ int len, int err, int more);
+extern int mconsole_reply(struct mc_request *req, const char *str, int err,
+ int more);
+
+extern void mconsole_version(struct mc_request *req);
+extern void mconsole_help(struct mc_request *req);
+extern void mconsole_halt(struct mc_request *req);
+extern void mconsole_reboot(struct mc_request *req);
+extern void mconsole_config(struct mc_request *req);
+extern void mconsole_remove(struct mc_request *req);
+extern void mconsole_sysrq(struct mc_request *req);
+extern void mconsole_cad(struct mc_request *req);
+extern void mconsole_stop(struct mc_request *req);
+extern void mconsole_go(struct mc_request *req);
+extern void mconsole_log(struct mc_request *req);
+extern void mconsole_proc(struct mc_request *req);
+extern void mconsole_stack(struct mc_request *req);
+
+extern int mconsole_get_request(int fd, struct mc_request *req);
+extern int mconsole_notify(char *sock_name, int type, const void *data,
+ int len);
+extern char *mconsole_notify_socket(void);
+extern void lock_notify(void);
+extern void unlock_notify(void);
+
+#endif
diff --git a/arch/um/drivers/mconsole_kern.c b/arch/um/drivers/mconsole_kern.c
new file mode 100644
index 0000000..e22e572
--- /dev/null
+++ b/arch/um/drivers/mconsole_kern.c
@@ -0,0 +1,858 @@
+/*
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org)
+ * Copyright (C) 2001 - 2008 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/console.h>
+#include <linux/ctype.h>
+#include <linux/string.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
+#include <linux/proc_fs.h>
+#include <linux/slab.h>
+#include <linux/syscalls.h>
+#include <linux/utsname.h>
+#include <linux/socket.h>
+#include <linux/un.h>
+#include <linux/workqueue.h>
+#include <linux/mutex.h>
+#include <linux/fs.h>
+#include <linux/mount.h>
+#include <linux/file.h>
+#include <asm/uaccess.h>
+#include <asm/switch_to.h>
+
+#include <init.h>
+#include <irq_kern.h>
+#include <irq_user.h>
+#include <kern_util.h>
+#include "mconsole.h"
+#include "mconsole_kern.h"
+#include <os.h>
+
+static int do_unlink_socket(struct notifier_block *notifier,
+ unsigned long what, void *data)
+{
+ return mconsole_unlink_socket();
+}
+
+
+static struct notifier_block reboot_notifier = {
+ .notifier_call = do_unlink_socket,
+ .priority = 0,
+};
+
+/* Safe without explicit locking for now. Tasklets provide their own
+ * locking, and the interrupt handler is safe because it can't interrupt
+ * itself and it can only happen on CPU 0.
+ */
+
+static LIST_HEAD(mc_requests);
+
+static void mc_work_proc(struct work_struct *unused)
+{
+ struct mconsole_entry *req;
+ unsigned long flags;
+
+ while (!list_empty(&mc_requests)) {
+ local_irq_save(flags);
+ req = list_entry(mc_requests.next, struct mconsole_entry, list);
+ list_del(&req->list);
+ local_irq_restore(flags);
+ req->request.cmd->handler(&req->request);
+ kfree(req);
+ }
+}
+
+static DECLARE_WORK(mconsole_work, mc_work_proc);
+
+static irqreturn_t mconsole_interrupt(int irq, void *dev_id)
+{
+ /* long to avoid size mismatch warnings from gcc */
+ long fd;
+ struct mconsole_entry *new;
+ static struct mc_request req; /* that's OK */
+
+ fd = (long) dev_id;
+ while (mconsole_get_request(fd, &req)) {
+ if (req.cmd->context == MCONSOLE_INTR)
+ (*req.cmd->handler)(&req);
+ else {
+ new = kmalloc(sizeof(*new), GFP_NOWAIT);
+ if (new == NULL)
+ mconsole_reply(&req, "Out of memory", 1, 0);
+ else {
+ new->request = req;
+ new->request.regs = get_irq_regs()->regs;
+ list_add(&new->list, &mc_requests);
+ }
+ }
+ }
+ if (!list_empty(&mc_requests))
+ schedule_work(&mconsole_work);
+ reactivate_fd(fd, MCONSOLE_IRQ);
+ return IRQ_HANDLED;
+}
+
+void mconsole_version(struct mc_request *req)
+{
+ char version[256];
+
+ sprintf(version, "%s %s %s %s %s", utsname()->sysname,
+ utsname()->nodename, utsname()->release, utsname()->version,
+ utsname()->machine);
+ mconsole_reply(req, version, 0, 0);
+}
+
+void mconsole_log(struct mc_request *req)
+{
+ int len;
+ char *ptr = req->request.data;
+
+ ptr += strlen("log ");
+
+ len = req->len - (ptr - req->request.data);
+ printk(KERN_WARNING "%.*s", len, ptr);
+ mconsole_reply(req, "", 0, 0);
+}
+
+void mconsole_proc(struct mc_request *req)
+{
+ struct vfsmount *mnt = task_active_pid_ns(current)->proc_mnt;
+ char *buf;
+ int len;
+ struct file *file;
+ int first_chunk = 1;
+ char *ptr = req->request.data;
+
+ ptr += strlen("proc");
+ ptr = skip_spaces(ptr);
+
+ file = file_open_root(mnt->mnt_root, mnt, ptr, O_RDONLY, 0);
+ if (IS_ERR(file)) {
+ mconsole_reply(req, "Failed to open file", 1, 0);
+ printk(KERN_ERR "open /proc/%s: %ld\n", ptr, PTR_ERR(file));
+ goto out;
+ }
+
+ buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ if (buf == NULL) {
+ mconsole_reply(req, "Failed to allocate buffer", 1, 0);
+ goto out_fput;
+ }
+
+ do {
+ loff_t pos = file->f_pos;
+ mm_segment_t old_fs = get_fs();
+ set_fs(KERNEL_DS);
+ len = vfs_read(file, buf, PAGE_SIZE - 1, &pos);
+ set_fs(old_fs);
+ file->f_pos = pos;
+ if (len < 0) {
+ mconsole_reply(req, "Read of file failed", 1, 0);
+ goto out_free;
+ }
+ /* Begin the file content on his own line. */
+ if (first_chunk) {
+ mconsole_reply(req, "\n", 0, 1);
+ first_chunk = 0;
+ }
+ buf[len] = '\0';
+ mconsole_reply(req, buf, 0, (len > 0));
+ } while (len > 0);
+ out_free:
+ kfree(buf);
+ out_fput:
+ fput(file);
+ out: ;
+}
+
+#define UML_MCONSOLE_HELPTEXT \
+"Commands: \n\
+ version - Get kernel version \n\
+ help - Print this message \n\
+ halt - Halt UML \n\
+ reboot - Reboot UML \n\
+ config <dev>=<config> - Add a new device to UML; \n\
+ same syntax as command line \n\
+ config <dev> - Query the configuration of a device \n\
+ remove <dev> - Remove a device from UML \n\
+ sysrq <letter> - Performs the SysRq action controlled by the letter \n\
+ cad - invoke the Ctrl-Alt-Del handler \n\
+ stop - pause the UML; it will do nothing until it receives a 'go' \n\
+ go - continue the UML after a 'stop' \n\
+ log <string> - make UML enter <string> into the kernel log\n\
+ proc <file> - returns the contents of the UML's /proc/<file>\n\
+ stack <pid> - returns the stack of the specified pid\n\
+"
+
+void mconsole_help(struct mc_request *req)
+{
+ mconsole_reply(req, UML_MCONSOLE_HELPTEXT, 0, 0);
+}
+
+void mconsole_halt(struct mc_request *req)
+{
+ mconsole_reply(req, "", 0, 0);
+ machine_halt();
+}
+
+void mconsole_reboot(struct mc_request *req)
+{
+ mconsole_reply(req, "", 0, 0);
+ machine_restart(NULL);
+}
+
+void mconsole_cad(struct mc_request *req)
+{
+ mconsole_reply(req, "", 0, 0);
+ ctrl_alt_del();
+}
+
+void mconsole_go(struct mc_request *req)
+{
+ mconsole_reply(req, "Not stopped", 1, 0);
+}
+
+void mconsole_stop(struct mc_request *req)
+{
+ deactivate_fd(req->originating_fd, MCONSOLE_IRQ);
+ os_set_fd_block(req->originating_fd, 1);
+ mconsole_reply(req, "stopped", 0, 0);
+ for (;;) {
+ if (!mconsole_get_request(req->originating_fd, req))
+ continue;
+ if (req->cmd->handler == mconsole_go)
+ break;
+ if (req->cmd->handler == mconsole_stop) {
+ mconsole_reply(req, "Already stopped", 1, 0);
+ continue;
+ }
+ if (req->cmd->handler == mconsole_sysrq) {
+ struct pt_regs *old_regs;
+ old_regs = set_irq_regs((struct pt_regs *)&req->regs);
+ mconsole_sysrq(req);
+ set_irq_regs(old_regs);
+ continue;
+ }
+ (*req->cmd->handler)(req);
+ }
+ os_set_fd_block(req->originating_fd, 0);
+ reactivate_fd(req->originating_fd, MCONSOLE_IRQ);
+ mconsole_reply(req, "", 0, 0);
+}
+
+static DEFINE_SPINLOCK(mc_devices_lock);
+static LIST_HEAD(mconsole_devices);
+
+void mconsole_register_dev(struct mc_device *new)
+{
+ spin_lock(&mc_devices_lock);
+ BUG_ON(!list_empty(&new->list));
+ list_add(&new->list, &mconsole_devices);
+ spin_unlock(&mc_devices_lock);
+}
+
+static struct mc_device *mconsole_find_dev(char *name)
+{
+ struct list_head *ele;
+ struct mc_device *dev;
+
+ list_for_each(ele, &mconsole_devices) {
+ dev = list_entry(ele, struct mc_device, list);
+ if (!strncmp(name, dev->name, strlen(dev->name)))
+ return dev;
+ }
+ return NULL;
+}
+
+#define UNPLUGGED_PER_PAGE \
+ ((PAGE_SIZE - sizeof(struct list_head)) / sizeof(unsigned long))
+
+struct unplugged_pages {
+ struct list_head list;
+ void *pages[UNPLUGGED_PER_PAGE];
+};
+
+static DEFINE_MUTEX(plug_mem_mutex);
+static unsigned long long unplugged_pages_count = 0;
+static LIST_HEAD(unplugged_pages);
+static int unplug_index = UNPLUGGED_PER_PAGE;
+
+static int mem_config(char *str, char **error_out)
+{
+ unsigned long long diff;
+ int err = -EINVAL, i, add;
+ char *ret;
+
+ if (str[0] != '=') {
+ *error_out = "Expected '=' after 'mem'";
+ goto out;
+ }
+
+ str++;
+ if (str[0] == '-')
+ add = 0;
+ else if (str[0] == '+') {
+ add = 1;
+ }
+ else {
+ *error_out = "Expected increment to start with '-' or '+'";
+ goto out;
+ }
+
+ str++;
+ diff = memparse(str, &ret);
+ if (*ret != '\0') {
+ *error_out = "Failed to parse memory increment";
+ goto out;
+ }
+
+ diff /= PAGE_SIZE;
+
+ mutex_lock(&plug_mem_mutex);
+ for (i = 0; i < diff; i++) {
+ struct unplugged_pages *unplugged;
+ void *addr;
+
+ if (add) {
+ if (list_empty(&unplugged_pages))
+ break;
+
+ unplugged = list_entry(unplugged_pages.next,
+ struct unplugged_pages, list);
+ if (unplug_index > 0)
+ addr = unplugged->pages[--unplug_index];
+ else {
+ list_del(&unplugged->list);
+ addr = unplugged;
+ unplug_index = UNPLUGGED_PER_PAGE;
+ }
+
+ free_page((unsigned long) addr);
+ unplugged_pages_count--;
+ }
+ else {
+ struct page *page;
+
+ page = alloc_page(GFP_ATOMIC);
+ if (page == NULL)
+ break;
+
+ unplugged = page_address(page);
+ if (unplug_index == UNPLUGGED_PER_PAGE) {
+ list_add(&unplugged->list, &unplugged_pages);
+ unplug_index = 0;
+ }
+ else {
+ struct list_head *entry = unplugged_pages.next;
+ addr = unplugged;
+
+ unplugged = list_entry(entry,
+ struct unplugged_pages,
+ list);
+ err = os_drop_memory(addr, PAGE_SIZE);
+ if (err) {
+ printk(KERN_ERR "Failed to release "
+ "memory - errno = %d\n", err);
+ *error_out = "Failed to release memory";
+ goto out_unlock;
+ }
+ unplugged->pages[unplug_index++] = addr;
+ }
+
+ unplugged_pages_count++;
+ }
+ }
+
+ err = 0;
+out_unlock:
+ mutex_unlock(&plug_mem_mutex);
+out:
+ return err;
+}
+
+static int mem_get_config(char *name, char *str, int size, char **error_out)
+{
+ char buf[sizeof("18446744073709551615")];
+ int len = 0;
+
+ sprintf(buf, "%ld", uml_physmem);
+ CONFIG_CHUNK(str, size, len, buf, 1);
+
+ return len;
+}
+
+static int mem_id(char **str, int *start_out, int *end_out)
+{
+ *start_out = 0;
+ *end_out = 0;
+
+ return 0;
+}
+
+static int mem_remove(int n, char **error_out)
+{
+ *error_out = "Memory doesn't support the remove operation";
+ return -EBUSY;
+}
+
+static struct mc_device mem_mc = {
+ .list = LIST_HEAD_INIT(mem_mc.list),
+ .name = "mem",
+ .config = mem_config,
+ .get_config = mem_get_config,
+ .id = mem_id,
+ .remove = mem_remove,
+};
+
+static int __init mem_mc_init(void)
+{
+ if (can_drop_memory())
+ mconsole_register_dev(&mem_mc);
+ else printk(KERN_ERR "Can't release memory to the host - memory "
+ "hotplug won't be supported\n");
+ return 0;
+}
+
+__initcall(mem_mc_init);
+
+#define CONFIG_BUF_SIZE 64
+
+static void mconsole_get_config(int (*get_config)(char *, char *, int,
+ char **),
+ struct mc_request *req, char *name)
+{
+ char default_buf[CONFIG_BUF_SIZE], *error, *buf;
+ int n, size;
+
+ if (get_config == NULL) {
+ mconsole_reply(req, "No get_config routine defined", 1, 0);
+ return;
+ }
+
+ error = NULL;
+ size = ARRAY_SIZE(default_buf);
+ buf = default_buf;
+
+ while (1) {
+ n = (*get_config)(name, buf, size, &error);
+ if (error != NULL) {
+ mconsole_reply(req, error, 1, 0);
+ goto out;
+ }
+
+ if (n <= size) {
+ mconsole_reply(req, buf, 0, 0);
+ goto out;
+ }
+
+ if (buf != default_buf)
+ kfree(buf);
+
+ size = n;
+ buf = kmalloc(size, GFP_KERNEL);
+ if (buf == NULL) {
+ mconsole_reply(req, "Failed to allocate buffer", 1, 0);
+ return;
+ }
+ }
+ out:
+ if (buf != default_buf)
+ kfree(buf);
+}
+
+void mconsole_config(struct mc_request *req)
+{
+ struct mc_device *dev;
+ char *ptr = req->request.data, *name, *error_string = "";
+ int err;
+
+ ptr += strlen("config");
+ ptr = skip_spaces(ptr);
+ dev = mconsole_find_dev(ptr);
+ if (dev == NULL) {
+ mconsole_reply(req, "Bad configuration option", 1, 0);
+ return;
+ }
+
+ name = &ptr[strlen(dev->name)];
+ ptr = name;
+ while ((*ptr != '=') && (*ptr != '\0'))
+ ptr++;
+
+ if (*ptr == '=') {
+ err = (*dev->config)(name, &error_string);
+ mconsole_reply(req, error_string, err, 0);
+ }
+ else mconsole_get_config(dev->get_config, req, name);
+}
+
+void mconsole_remove(struct mc_request *req)
+{
+ struct mc_device *dev;
+ char *ptr = req->request.data, *err_msg = "";
+ char error[256];
+ int err, start, end, n;
+
+ ptr += strlen("remove");
+ ptr = skip_spaces(ptr);
+ dev = mconsole_find_dev(ptr);
+ if (dev == NULL) {
+ mconsole_reply(req, "Bad remove option", 1, 0);
+ return;
+ }
+
+ ptr = &ptr[strlen(dev->name)];
+
+ err = 1;
+ n = (*dev->id)(&ptr, &start, &end);
+ if (n < 0) {
+ err_msg = "Couldn't parse device number";
+ goto out;
+ }
+ else if ((n < start) || (n > end)) {
+ sprintf(error, "Invalid device number - must be between "
+ "%d and %d", start, end);
+ err_msg = error;
+ goto out;
+ }
+
+ err_msg = NULL;
+ err = (*dev->remove)(n, &err_msg);
+ switch(err) {
+ case 0:
+ err_msg = "";
+ break;
+ case -ENODEV:
+ if (err_msg == NULL)
+ err_msg = "Device doesn't exist";
+ break;
+ case -EBUSY:
+ if (err_msg == NULL)
+ err_msg = "Device is currently open";
+ break;
+ default:
+ break;
+ }
+out:
+ mconsole_reply(req, err_msg, err, 0);
+}
+
+struct mconsole_output {
+ struct list_head list;
+ struct mc_request *req;
+};
+
+static DEFINE_SPINLOCK(client_lock);
+static LIST_HEAD(clients);
+static char console_buf[MCONSOLE_MAX_DATA];
+
+static void console_write(struct console *console, const char *string,
+ unsigned int len)
+{
+ struct list_head *ele;
+ int n;
+
+ if (list_empty(&clients))
+ return;
+
+ while (len > 0) {
+ n = min((size_t) len, ARRAY_SIZE(console_buf));
+ strncpy(console_buf, string, n);
+ string += n;
+ len -= n;
+
+ list_for_each(ele, &clients) {
+ struct mconsole_output *entry;
+
+ entry = list_entry(ele, struct mconsole_output, list);
+ mconsole_reply_len(entry->req, console_buf, n, 0, 1);
+ }
+ }
+}
+
+static struct console mc_console = { .name = "mc",
+ .write = console_write,
+ .flags = CON_ENABLED,
+ .index = -1 };
+
+static int mc_add_console(void)
+{
+ register_console(&mc_console);
+ return 0;
+}
+
+late_initcall(mc_add_console);
+
+static void with_console(struct mc_request *req, void (*proc)(void *),
+ void *arg)
+{
+ struct mconsole_output entry;
+ unsigned long flags;
+
+ entry.req = req;
+ spin_lock_irqsave(&client_lock, flags);
+ list_add(&entry.list, &clients);
+ spin_unlock_irqrestore(&client_lock, flags);
+
+ (*proc)(arg);
+
+ mconsole_reply_len(req, "", 0, 0, 0);
+
+ spin_lock_irqsave(&client_lock, flags);
+ list_del(&entry.list);
+ spin_unlock_irqrestore(&client_lock, flags);
+}
+
+#ifdef CONFIG_MAGIC_SYSRQ
+
+#include <linux/sysrq.h>
+
+static void sysrq_proc(void *arg)
+{
+ char *op = arg;
+ handle_sysrq(*op);
+}
+
+void mconsole_sysrq(struct mc_request *req)
+{
+ char *ptr = req->request.data;
+
+ ptr += strlen("sysrq");
+ ptr = skip_spaces(ptr);
+
+ /*
+ * With 'b', the system will shut down without a chance to reply,
+ * so in this case, we reply first.
+ */
+ if (*ptr == 'b')
+ mconsole_reply(req, "", 0, 0);
+
+ with_console(req, sysrq_proc, ptr);
+}
+#else
+void mconsole_sysrq(struct mc_request *req)
+{
+ mconsole_reply(req, "Sysrq not compiled in", 1, 0);
+}
+#endif
+
+static void stack_proc(void *arg)
+{
+ struct task_struct *task = arg;
+
+ show_stack(task, NULL);
+}
+
+/*
+ * Mconsole stack trace
+ * Added by Allan Graves, Jeff Dike
+ * Dumps a stacks registers to the linux console.
+ * Usage stack <pid>.
+ */
+void mconsole_stack(struct mc_request *req)
+{
+ char *ptr = req->request.data;
+ int pid_requested= -1;
+ struct task_struct *to = NULL;
+
+ /*
+ * Would be nice:
+ * 1) Send showregs output to mconsole.
+ * 2) Add a way to stack dump all pids.
+ */
+
+ ptr += strlen("stack");
+ ptr = skip_spaces(ptr);
+
+ /*
+ * Should really check for multiple pids or reject bad args here
+ */
+ /* What do the arguments in mconsole_reply mean? */
+ if (sscanf(ptr, "%d", &pid_requested) == 0) {
+ mconsole_reply(req, "Please specify a pid", 1, 0);
+ return;
+ }
+
+ to = find_task_by_pid_ns(pid_requested, &init_pid_ns);
+ if ((to == NULL) || (pid_requested == 0)) {
+ mconsole_reply(req, "Couldn't find that pid", 1, 0);
+ return;
+ }
+ with_console(req, stack_proc, to);
+}
+
+/*
+ * Changed by mconsole_setup, which is __setup, and called before SMP is
+ * active.
+ */
+static char *notify_socket = NULL;
+
+static int __init mconsole_init(void)
+{
+ /* long to avoid size mismatch warnings from gcc */
+ long sock;
+ int err;
+ char file[UNIX_PATH_MAX];
+
+ if (umid_file_name("mconsole", file, sizeof(file)))
+ return -1;
+ snprintf(mconsole_socket_name, sizeof(file), "%s", file);
+
+ sock = os_create_unix_socket(file, sizeof(file), 1);
+ if (sock < 0) {
+ printk(KERN_ERR "Failed to initialize management console\n");
+ return 1;
+ }
+ if (os_set_fd_block(sock, 0))
+ goto out;
+
+ register_reboot_notifier(&reboot_notifier);
+
+ err = um_request_irq(MCONSOLE_IRQ, sock, IRQ_READ, mconsole_interrupt,
+ IRQF_SHARED, "mconsole", (void *)sock);
+ if (err) {
+ printk(KERN_ERR "Failed to get IRQ for management console\n");
+ goto out;
+ }
+
+ if (notify_socket != NULL) {
+ notify_socket = kstrdup(notify_socket, GFP_KERNEL);
+ if (notify_socket != NULL)
+ mconsole_notify(notify_socket, MCONSOLE_SOCKET,
+ mconsole_socket_name,
+ strlen(mconsole_socket_name) + 1);
+ else printk(KERN_ERR "mconsole_setup failed to strdup "
+ "string\n");
+ }
+
+ printk(KERN_INFO "mconsole (version %d) initialized on %s\n",
+ MCONSOLE_VERSION, mconsole_socket_name);
+ return 0;
+
+ out:
+ os_close_file(sock);
+ return 1;
+}
+
+__initcall(mconsole_init);
+
+static ssize_t mconsole_proc_write(struct file *file,
+ const char __user *buffer, size_t count, loff_t *pos)
+{
+ char *buf;
+
+ buf = kmalloc(count + 1, GFP_KERNEL);
+ if (buf == NULL)
+ return -ENOMEM;
+
+ if (copy_from_user(buf, buffer, count)) {
+ count = -EFAULT;
+ goto out;
+ }
+
+ buf[count] = '\0';
+
+ mconsole_notify(notify_socket, MCONSOLE_USER_NOTIFY, buf, count);
+ out:
+ kfree(buf);
+ return count;
+}
+
+static const struct file_operations mconsole_proc_fops = {
+ .owner = THIS_MODULE,
+ .write = mconsole_proc_write,
+ .llseek = noop_llseek,
+};
+
+static int create_proc_mconsole(void)
+{
+ struct proc_dir_entry *ent;
+
+ if (notify_socket == NULL)
+ return 0;
+
+ ent = proc_create("mconsole", 0200, NULL, &mconsole_proc_fops);
+ if (ent == NULL) {
+ printk(KERN_INFO "create_proc_mconsole : proc_create failed\n");
+ return 0;
+ }
+ return 0;
+}
+
+static DEFINE_SPINLOCK(notify_spinlock);
+
+void lock_notify(void)
+{
+ spin_lock(¬ify_spinlock);
+}
+
+void unlock_notify(void)
+{
+ spin_unlock(¬ify_spinlock);
+}
+
+__initcall(create_proc_mconsole);
+
+#define NOTIFY "notify:"
+
+static int mconsole_setup(char *str)
+{
+ if (!strncmp(str, NOTIFY, strlen(NOTIFY))) {
+ str += strlen(NOTIFY);
+ notify_socket = str;
+ }
+ else printk(KERN_ERR "mconsole_setup : Unknown option - '%s'\n", str);
+ return 1;
+}
+
+__setup("mconsole=", mconsole_setup);
+
+__uml_help(mconsole_setup,
+"mconsole=notify:<socket>\n"
+" Requests that the mconsole driver send a message to the named Unix\n"
+" socket containing the name of the mconsole socket. This also serves\n"
+" to notify outside processes when UML has booted far enough to respond\n"
+" to mconsole requests.\n\n"
+);
+
+static int notify_panic(struct notifier_block *self, unsigned long unused1,
+ void *ptr)
+{
+ char *message = ptr;
+
+ if (notify_socket == NULL)
+ return 0;
+
+ mconsole_notify(notify_socket, MCONSOLE_PANIC, message,
+ strlen(message) + 1);
+ return 0;
+}
+
+static struct notifier_block panic_exit_notifier = {
+ .notifier_call = notify_panic,
+ .next = NULL,
+ .priority = 1
+};
+
+static int add_notifier(void)
+{
+ atomic_notifier_chain_register(&panic_notifier_list,
+ &panic_exit_notifier);
+ return 0;
+}
+
+__initcall(add_notifier);
+
+char *mconsole_notify_socket(void)
+{
+ return notify_socket;
+}
+
+EXPORT_SYMBOL(mconsole_notify_socket);
diff --git a/arch/um/drivers/mconsole_kern.h b/arch/um/drivers/mconsole_kern.h
new file mode 100644
index 0000000..7a0c6a1
--- /dev/null
+++ b/arch/um/drivers/mconsole_kern.h
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __MCONSOLE_KERN_H__
+#define __MCONSOLE_KERN_H__
+
+#include <linux/list.h>
+#include "mconsole.h"
+
+struct mconsole_entry {
+ struct list_head list;
+ struct mc_request request;
+};
+
+/* All these methods are called in process context. */
+struct mc_device {
+ struct list_head list;
+ char *name;
+ int (*config)(char *, char **);
+ int (*get_config)(char *, char *, int, char **);
+ int (*id)(char **, int *, int *);
+ int (*remove)(int, char **);
+};
+
+#define CONFIG_CHUNK(str, size, current, chunk, end) \
+do { \
+ current += strlen(chunk); \
+ if(current >= size) \
+ str = NULL; \
+ if(str != NULL){ \
+ strcpy(str, chunk); \
+ str += strlen(chunk); \
+ } \
+ if(end) \
+ current++; \
+} while(0)
+
+#ifdef CONFIG_MCONSOLE
+
+extern void mconsole_register_dev(struct mc_device *new);
+
+#else
+
+static inline void mconsole_register_dev(struct mc_device *new)
+{
+}
+
+#endif
+
+#endif
diff --git a/arch/um/drivers/mconsole_user.c b/arch/um/drivers/mconsole_user.c
new file mode 100644
index 0000000..9920982
--- /dev/null
+++ b/arch/um/drivers/mconsole_user.c
@@ -0,0 +1,219 @@
+/*
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org)
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/socket.h>
+#include <sys/uio.h>
+#include <sys/un.h>
+#include "mconsole.h"
+
+static struct mconsole_command commands[] = {
+ /*
+ * With uts namespaces, uts information becomes process-specific, so
+ * we need a process context. If we try handling this in interrupt
+ * context, we may hit an exiting process without a valid uts
+ * namespace.
+ */
+ { "version", mconsole_version, MCONSOLE_PROC },
+ { "halt", mconsole_halt, MCONSOLE_PROC },
+ { "reboot", mconsole_reboot, MCONSOLE_PROC },
+ { "config", mconsole_config, MCONSOLE_PROC },
+ { "remove", mconsole_remove, MCONSOLE_PROC },
+ { "sysrq", mconsole_sysrq, MCONSOLE_INTR },
+ { "help", mconsole_help, MCONSOLE_INTR },
+ { "cad", mconsole_cad, MCONSOLE_INTR },
+ { "stop", mconsole_stop, MCONSOLE_PROC },
+ { "go", mconsole_go, MCONSOLE_INTR },
+ { "log", mconsole_log, MCONSOLE_INTR },
+ { "proc", mconsole_proc, MCONSOLE_PROC },
+ { "stack", mconsole_stack, MCONSOLE_INTR },
+};
+
+/* Initialized in mconsole_init, which is an initcall */
+char mconsole_socket_name[256];
+
+static int mconsole_reply_v0(struct mc_request *req, char *reply)
+{
+ struct iovec iov;
+ struct msghdr msg;
+
+ iov.iov_base = reply;
+ iov.iov_len = strlen(reply);
+
+ msg.msg_name = &(req->origin);
+ msg.msg_namelen = req->originlen;
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_flags = 0;
+
+ return sendmsg(req->originating_fd, &msg, 0);
+}
+
+static struct mconsole_command *mconsole_parse(struct mc_request *req)
+{
+ struct mconsole_command *cmd;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(commands); i++) {
+ cmd = &commands[i];
+ if (!strncmp(req->request.data, cmd->command,
+ strlen(cmd->command))) {
+ return cmd;
+ }
+ }
+ return NULL;
+}
+
+#define MIN(a,b) ((a)<(b) ? (a):(b))
+
+#define STRINGX(x) #x
+#define STRING(x) STRINGX(x)
+
+int mconsole_get_request(int fd, struct mc_request *req)
+{
+ int len;
+
+ req->originlen = sizeof(req->origin);
+ req->len = recvfrom(fd, &req->request, sizeof(req->request), 0,
+ (struct sockaddr *) req->origin, &req->originlen);
+ if (req->len < 0)
+ return 0;
+
+ req->originating_fd = fd;
+
+ if (req->request.magic != MCONSOLE_MAGIC) {
+ /* Unversioned request */
+ len = MIN(sizeof(req->request.data) - 1,
+ strlen((char *) &req->request));
+ memmove(req->request.data, &req->request, len);
+ req->request.data[len] = '\0';
+
+ req->request.magic = MCONSOLE_MAGIC;
+ req->request.version = 0;
+ req->request.len = len;
+
+ mconsole_reply_v0(req, "ERR Version 0 mconsole clients are "
+ "not supported by this driver");
+ return 0;
+ }
+
+ if (req->request.len >= MCONSOLE_MAX_DATA) {
+ mconsole_reply(req, "Request too large", 1, 0);
+ return 0;
+ }
+ if (req->request.version != MCONSOLE_VERSION) {
+ mconsole_reply(req, "This driver only supports version "
+ STRING(MCONSOLE_VERSION) " clients", 1, 0);
+ }
+
+ req->request.data[req->request.len] = '\0';
+ req->cmd = mconsole_parse(req);
+ if (req->cmd == NULL) {
+ mconsole_reply(req, "Unknown command", 1, 0);
+ return 0;
+ }
+
+ return 1;
+}
+
+int mconsole_reply_len(struct mc_request *req, const char *str, int total,
+ int err, int more)
+{
+ /*
+ * XXX This is a stack consumption problem. It'd be nice to
+ * make it global and serialize access to it, but there are a
+ * ton of callers to this function.
+ */
+ struct mconsole_reply reply;
+ int len, n;
+
+ do {
+ reply.err = err;
+
+ /* err can only be true on the first packet */
+ err = 0;
+
+ len = MIN(total, MCONSOLE_MAX_DATA - 1);
+
+ if (len == total) reply.more = more;
+ else reply.more = 1;
+
+ memcpy(reply.data, str, len);
+ reply.data[len] = '\0';
+ total -= len;
+ str += len;
+ reply.len = len + 1;
+
+ len = sizeof(reply) + reply.len - sizeof(reply.data);
+
+ n = sendto(req->originating_fd, &reply, len, 0,
+ (struct sockaddr *) req->origin, req->originlen);
+
+ if (n < 0)
+ return -errno;
+ } while (total > 0);
+ return 0;
+}
+
+int mconsole_reply(struct mc_request *req, const char *str, int err, int more)
+{
+ return mconsole_reply_len(req, str, strlen(str), err, more);
+}
+
+
+int mconsole_unlink_socket(void)
+{
+ unlink(mconsole_socket_name);
+ return 0;
+}
+
+static int notify_sock = -1;
+
+int mconsole_notify(char *sock_name, int type, const void *data, int len)
+{
+ struct sockaddr_un target;
+ struct mconsole_notify packet;
+ int n, err = 0;
+
+ lock_notify();
+ if (notify_sock < 0) {
+ notify_sock = socket(PF_UNIX, SOCK_DGRAM, 0);
+ if (notify_sock < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "mconsole_notify - socket failed, "
+ "errno = %d\n", errno);
+ }
+ }
+ unlock_notify();
+
+ if (err)
+ return err;
+
+ target.sun_family = AF_UNIX;
+ strcpy(target.sun_path, sock_name);
+
+ packet.magic = MCONSOLE_MAGIC;
+ packet.version = MCONSOLE_VERSION;
+ packet.type = type;
+ len = (len > sizeof(packet.data)) ? sizeof(packet.data) : len;
+ packet.len = len;
+ memcpy(packet.data, data, len);
+
+ err = 0;
+ len = sizeof(packet) + packet.len - sizeof(packet.data);
+ n = sendto(notify_sock, &packet, len, 0, (struct sockaddr *) &target,
+ sizeof(target));
+ if (n < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "mconsole_notify - sendto failed, "
+ "errno = %d\n", errno);
+ }
+ return err;
+}
diff --git a/arch/um/drivers/mmapper_kern.c b/arch/um/drivers/mmapper_kern.c
new file mode 100644
index 0000000..62145c2
--- /dev/null
+++ b/arch/um/drivers/mmapper_kern.c
@@ -0,0 +1,134 @@
+/*
+ * arch/um/drivers/mmapper_kern.c
+ *
+ * BRIEF MODULE DESCRIPTION
+ *
+ * Copyright (C) 2000 RidgeRun, Inc.
+ * Author: RidgeRun, Inc.
+ * Greg Lonnon glonnon@ridgerun.com or info@ridgerun.com
+ *
+ */
+
+#include <linux/stddef.h>
+#include <linux/types.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/mm.h>
+
+#include <asm/uaccess.h>
+#include <mem_user.h>
+
+/* These are set in mmapper_init, which is called at boot time */
+static unsigned long mmapper_size;
+static unsigned long p_buf;
+static char *v_buf;
+
+static ssize_t mmapper_read(struct file *file, char __user *buf, size_t count,
+ loff_t *ppos)
+{
+ return simple_read_from_buffer(buf, count, ppos, v_buf, mmapper_size);
+}
+
+static ssize_t mmapper_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ if (*ppos > mmapper_size)
+ return -EINVAL;
+
+ return simple_write_to_buffer(v_buf, mmapper_size, ppos, buf, count);
+}
+
+static long mmapper_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ return -ENOIOCTLCMD;
+}
+
+static int mmapper_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ int ret = -EINVAL;
+ int size;
+
+ if (vma->vm_pgoff != 0)
+ goto out;
+
+ size = vma->vm_end - vma->vm_start;
+ if (size > mmapper_size)
+ return -EFAULT;
+
+ /*
+ * XXX A comment above remap_pfn_range says it should only be
+ * called when the mm semaphore is held
+ */
+ if (remap_pfn_range(vma, vma->vm_start, p_buf >> PAGE_SHIFT, size,
+ vma->vm_page_prot))
+ goto out;
+ ret = 0;
+out:
+ return ret;
+}
+
+static int mmapper_open(struct inode *inode, struct file *file)
+{
+ return 0;
+}
+
+static int mmapper_release(struct inode *inode, struct file *file)
+{
+ return 0;
+}
+
+static const struct file_operations mmapper_fops = {
+ .owner = THIS_MODULE,
+ .read = mmapper_read,
+ .write = mmapper_write,
+ .unlocked_ioctl = mmapper_ioctl,
+ .mmap = mmapper_mmap,
+ .open = mmapper_open,
+ .release = mmapper_release,
+ .llseek = default_llseek,
+};
+
+/*
+ * No locking needed - only used (and modified) by below initcall and exitcall.
+ */
+static struct miscdevice mmapper_dev = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "mmapper",
+ .fops = &mmapper_fops
+};
+
+static int __init mmapper_init(void)
+{
+ int err;
+
+ printk(KERN_INFO "Mapper v0.1\n");
+
+ v_buf = (char *) find_iomem("mmapper", &mmapper_size);
+ if (mmapper_size == 0) {
+ printk(KERN_ERR "mmapper_init - find_iomem failed\n");
+ return -ENODEV;
+ }
+ p_buf = __pa(v_buf);
+
+ err = misc_register(&mmapper_dev);
+ if (err) {
+ printk(KERN_ERR "mmapper - misc_register failed, err = %d\n",
+ err);
+ return err;
+ }
+ return 0;
+}
+
+static void mmapper_exit(void)
+{
+ misc_deregister(&mmapper_dev);
+}
+
+module_init(mmapper_init);
+module_exit(mmapper_exit);
+
+MODULE_AUTHOR("Greg Lonnon <glonnon@ridgerun.com>");
+MODULE_DESCRIPTION("DSPLinux simulator mmapper driver");
+MODULE_LICENSE("GPL");
diff --git a/arch/um/drivers/net_kern.c b/arch/um/drivers/net_kern.c
new file mode 100644
index 0000000..9ef669d
--- /dev/null
+++ b/arch/um/drivers/net_kern.c
@@ -0,0 +1,912 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
+ * James Leu (jleu@mindspring.net).
+ * Copyright (C) 2001 by various other people who didn't put their name here.
+ * Licensed under the GPL.
+ */
+
+#include <linux/bootmem.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/inetdevice.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/netdevice.h>
+#include <linux/platform_device.h>
+#include <linux/rtnetlink.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <init.h>
+#include <irq_kern.h>
+#include <irq_user.h>
+#include "mconsole_kern.h"
+#include <net_kern.h>
+#include <net_user.h>
+
+#define DRIVER_NAME "uml-netdev"
+
+static DEFINE_SPINLOCK(opened_lock);
+static LIST_HEAD(opened);
+
+/*
+ * The drop_skb is used when we can't allocate an skb. The
+ * packet is read into drop_skb in order to get the data off the
+ * connection to the host.
+ * It is reallocated whenever a maximum packet size is seen which is
+ * larger than any seen before. update_drop_skb is called from
+ * eth_configure when a new interface is added.
+ */
+static DEFINE_SPINLOCK(drop_lock);
+static struct sk_buff *drop_skb;
+static int drop_max;
+
+static int update_drop_skb(int max)
+{
+ struct sk_buff *new;
+ unsigned long flags;
+ int err = 0;
+
+ spin_lock_irqsave(&drop_lock, flags);
+
+ if (max <= drop_max)
+ goto out;
+
+ err = -ENOMEM;
+ new = dev_alloc_skb(max);
+ if (new == NULL)
+ goto out;
+
+ skb_put(new, max);
+
+ kfree_skb(drop_skb);
+ drop_skb = new;
+ drop_max = max;
+ err = 0;
+out:
+ spin_unlock_irqrestore(&drop_lock, flags);
+
+ return err;
+}
+
+static int uml_net_rx(struct net_device *dev)
+{
+ struct uml_net_private *lp = netdev_priv(dev);
+ int pkt_len;
+ struct sk_buff *skb;
+
+ /* If we can't allocate memory, try again next round. */
+ skb = dev_alloc_skb(lp->max_packet);
+ if (skb == NULL) {
+ drop_skb->dev = dev;
+ /* Read a packet into drop_skb and don't do anything with it. */
+ (*lp->read)(lp->fd, drop_skb, lp);
+ dev->stats.rx_dropped++;
+ return 0;
+ }
+
+ skb->dev = dev;
+ skb_put(skb, lp->max_packet);
+ skb_reset_mac_header(skb);
+ pkt_len = (*lp->read)(lp->fd, skb, lp);
+
+ if (pkt_len > 0) {
+ skb_trim(skb, pkt_len);
+ skb->protocol = (*lp->protocol)(skb);
+
+ dev->stats.rx_bytes += skb->len;
+ dev->stats.rx_packets++;
+ netif_rx(skb);
+ return pkt_len;
+ }
+
+ kfree_skb(skb);
+ return pkt_len;
+}
+
+static void uml_dev_close(struct work_struct *work)
+{
+ struct uml_net_private *lp =
+ container_of(work, struct uml_net_private, work);
+ dev_close(lp->dev);
+}
+
+static irqreturn_t uml_net_interrupt(int irq, void *dev_id)
+{
+ struct net_device *dev = dev_id;
+ struct uml_net_private *lp = netdev_priv(dev);
+ int err;
+
+ if (!netif_running(dev))
+ return IRQ_NONE;
+
+ spin_lock(&lp->lock);
+ while ((err = uml_net_rx(dev)) > 0) ;
+ if (err < 0) {
+ printk(KERN_ERR
+ "Device '%s' read returned %d, shutting it down\n",
+ dev->name, err);
+ /* dev_close can't be called in interrupt context, and takes
+ * again lp->lock.
+ * And dev_close() can be safely called multiple times on the
+ * same device, since it tests for (dev->flags & IFF_UP). So
+ * there's no harm in delaying the device shutdown.
+ * Furthermore, the workqueue will not re-enqueue an already
+ * enqueued work item. */
+ schedule_work(&lp->work);
+ goto out;
+ }
+ reactivate_fd(lp->fd, UM_ETH_IRQ);
+
+out:
+ spin_unlock(&lp->lock);
+ return IRQ_HANDLED;
+}
+
+static int uml_net_open(struct net_device *dev)
+{
+ struct uml_net_private *lp = netdev_priv(dev);
+ int err;
+
+ if (lp->fd >= 0) {
+ err = -ENXIO;
+ goto out;
+ }
+
+ lp->fd = (*lp->open)(&lp->user);
+ if (lp->fd < 0) {
+ err = lp->fd;
+ goto out;
+ }
+
+ err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
+ IRQF_SHARED, dev->name, dev);
+ if (err != 0) {
+ printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
+ err = -ENETUNREACH;
+ goto out_close;
+ }
+
+ lp->tl.data = (unsigned long) &lp->user;
+ netif_start_queue(dev);
+
+ /* clear buffer - it can happen that the host side of the interface
+ * is full when we get here. In this case, new data is never queued,
+ * SIGIOs never arrive, and the net never works.
+ */
+ while ((err = uml_net_rx(dev)) > 0) ;
+
+ spin_lock(&opened_lock);
+ list_add(&lp->list, &opened);
+ spin_unlock(&opened_lock);
+
+ return 0;
+out_close:
+ if (lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
+ lp->fd = -1;
+out:
+ return err;
+}
+
+static int uml_net_close(struct net_device *dev)
+{
+ struct uml_net_private *lp = netdev_priv(dev);
+
+ netif_stop_queue(dev);
+
+ um_free_irq(dev->irq, dev);
+ if (lp->close != NULL)
+ (*lp->close)(lp->fd, &lp->user);
+ lp->fd = -1;
+
+ spin_lock(&opened_lock);
+ list_del(&lp->list);
+ spin_unlock(&opened_lock);
+
+ return 0;
+}
+
+static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct uml_net_private *lp = netdev_priv(dev);
+ unsigned long flags;
+ int len;
+
+ netif_stop_queue(dev);
+
+ spin_lock_irqsave(&lp->lock, flags);
+
+ len = (*lp->write)(lp->fd, skb, lp);
+ skb_tx_timestamp(skb);
+
+ if (len == skb->len) {
+ dev->stats.tx_packets++;
+ dev->stats.tx_bytes += skb->len;
+ dev->trans_start = jiffies;
+ netif_start_queue(dev);
+
+ /* this is normally done in the interrupt when tx finishes */
+ netif_wake_queue(dev);
+ }
+ else if (len == 0) {
+ netif_start_queue(dev);
+ dev->stats.tx_dropped++;
+ }
+ else {
+ netif_start_queue(dev);
+ printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
+ }
+
+ spin_unlock_irqrestore(&lp->lock, flags);
+
+ dev_consume_skb_any(skb);
+
+ return NETDEV_TX_OK;
+}
+
+static void uml_net_set_multicast_list(struct net_device *dev)
+{
+ return;
+}
+
+static void uml_net_tx_timeout(struct net_device *dev)
+{
+ dev->trans_start = jiffies;
+ netif_wake_queue(dev);
+}
+
+static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
+{
+ dev->mtu = new_mtu;
+
+ return 0;
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void uml_net_poll_controller(struct net_device *dev)
+{
+ disable_irq(dev->irq);
+ uml_net_interrupt(dev->irq, dev);
+ enable_irq(dev->irq);
+}
+#endif
+
+static void uml_net_get_drvinfo(struct net_device *dev,
+ struct ethtool_drvinfo *info)
+{
+ strlcpy(info->driver, DRIVER_NAME, sizeof(info->driver));
+ strlcpy(info->version, "42", sizeof(info->version));
+}
+
+static const struct ethtool_ops uml_net_ethtool_ops = {
+ .get_drvinfo = uml_net_get_drvinfo,
+ .get_link = ethtool_op_get_link,
+ .get_ts_info = ethtool_op_get_ts_info,
+};
+
+static void uml_net_user_timer_expire(unsigned long _conn)
+{
+#ifdef undef
+ struct connection *conn = (struct connection *)_conn;
+
+ dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
+ do_connect(conn);
+#endif
+}
+
+static void setup_etheraddr(struct net_device *dev, char *str)
+{
+ unsigned char *addr = dev->dev_addr;
+ char *end;
+ int i;
+
+ if (str == NULL)
+ goto random;
+
+ for (i = 0; i < 6; i++) {
+ addr[i] = simple_strtoul(str, &end, 16);
+ if ((end == str) ||
+ ((*end != ':') && (*end != ',') && (*end != '\0'))) {
+ printk(KERN_ERR
+ "setup_etheraddr: failed to parse '%s' "
+ "as an ethernet address\n", str);
+ goto random;
+ }
+ str = end + 1;
+ }
+ if (is_multicast_ether_addr(addr)) {
+ printk(KERN_ERR
+ "Attempt to assign a multicast ethernet address to a "
+ "device disallowed\n");
+ goto random;
+ }
+ if (!is_valid_ether_addr(addr)) {
+ printk(KERN_ERR
+ "Attempt to assign an invalid ethernet address to a "
+ "device disallowed\n");
+ goto random;
+ }
+ if (!is_local_ether_addr(addr)) {
+ printk(KERN_WARNING
+ "Warning: Assigning a globally valid ethernet "
+ "address to a device\n");
+ printk(KERN_WARNING "You should set the 2nd rightmost bit in "
+ "the first byte of the MAC,\n");
+ printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n",
+ addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4],
+ addr[5]);
+ }
+ return;
+
+random:
+ printk(KERN_INFO
+ "Choosing a random ethernet address for device %s\n", dev->name);
+ eth_hw_addr_random(dev);
+}
+
+static DEFINE_SPINLOCK(devices_lock);
+static LIST_HEAD(devices);
+
+static struct platform_driver uml_net_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ },
+};
+
+static void net_device_release(struct device *dev)
+{
+ struct uml_net *device = dev_get_drvdata(dev);
+ struct net_device *netdev = device->dev;
+ struct uml_net_private *lp = netdev_priv(netdev);
+
+ if (lp->remove != NULL)
+ (*lp->remove)(&lp->user);
+ list_del(&device->list);
+ kfree(device);
+ free_netdev(netdev);
+}
+
+static const struct net_device_ops uml_netdev_ops = {
+ .ndo_open = uml_net_open,
+ .ndo_stop = uml_net_close,
+ .ndo_start_xmit = uml_net_start_xmit,
+ .ndo_set_rx_mode = uml_net_set_multicast_list,
+ .ndo_tx_timeout = uml_net_tx_timeout,
+ .ndo_set_mac_address = eth_mac_addr,
+ .ndo_change_mtu = uml_net_change_mtu,
+ .ndo_validate_addr = eth_validate_addr,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+ .ndo_poll_controller = uml_net_poll_controller,
+#endif
+};
+
+/*
+ * Ensures that platform_driver_register is called only once by
+ * eth_configure. Will be set in an initcall.
+ */
+static int driver_registered;
+
+static void eth_configure(int n, void *init, char *mac,
+ struct transport *transport, gfp_t gfp_mask)
+{
+ struct uml_net *device;
+ struct net_device *dev;
+ struct uml_net_private *lp;
+ int err, size;
+
+ size = transport->private_size + sizeof(struct uml_net_private);
+
+ device = kzalloc(sizeof(*device), gfp_mask);
+ if (device == NULL) {
+ printk(KERN_ERR "eth_configure failed to allocate struct "
+ "uml_net\n");
+ return;
+ }
+
+ dev = alloc_etherdev(size);
+ if (dev == NULL) {
+ printk(KERN_ERR "eth_configure: failed to allocate struct "
+ "net_device for eth%d\n", n);
+ goto out_free_device;
+ }
+
+ INIT_LIST_HEAD(&device->list);
+ device->index = n;
+
+ /* If this name ends up conflicting with an existing registered
+ * netdevice, that is OK, register_netdev{,ice}() will notice this
+ * and fail.
+ */
+ snprintf(dev->name, sizeof(dev->name), "eth%d", n);
+
+ setup_etheraddr(dev, mac);
+
+ printk(KERN_INFO "Netdevice %d (%pM) : ", n, dev->dev_addr);
+
+ lp = netdev_priv(dev);
+ /* This points to the transport private data. It's still clear, but we
+ * must memset it to 0 *now*. Let's help the drivers. */
+ memset(lp, 0, size);
+ INIT_WORK(&lp->work, uml_dev_close);
+
+ /* sysfs register */
+ if (!driver_registered) {
+ platform_driver_register(¨_net_driver);
+ driver_registered = 1;
+ }
+ device->pdev.id = n;
+ device->pdev.name = DRIVER_NAME;
+ device->pdev.dev.release = net_device_release;
+ dev_set_drvdata(&device->pdev.dev, device);
+ if (platform_device_register(&device->pdev))
+ goto out_free_netdev;
+ SET_NETDEV_DEV(dev,&device->pdev.dev);
+
+ device->dev = dev;
+
+ /*
+ * These just fill in a data structure, so there's no failure
+ * to be worried about.
+ */
+ (*transport->kern->init)(dev, init);
+
+ *lp = ((struct uml_net_private)
+ { .list = LIST_HEAD_INIT(lp->list),
+ .dev = dev,
+ .fd = -1,
+ .mac = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
+ .max_packet = transport->user->max_packet,
+ .protocol = transport->kern->protocol,
+ .open = transport->user->open,
+ .close = transport->user->close,
+ .remove = transport->user->remove,
+ .read = transport->kern->read,
+ .write = transport->kern->write,
+ .add_address = transport->user->add_address,
+ .delete_address = transport->user->delete_address });
+
+ init_timer(&lp->tl);
+ spin_lock_init(&lp->lock);
+ lp->tl.function = uml_net_user_timer_expire;
+ memcpy(lp->mac, dev->dev_addr, sizeof(lp->mac));
+
+ if ((transport->user->init != NULL) &&
+ ((*transport->user->init)(&lp->user, dev) != 0))
+ goto out_unregister;
+
+ dev->mtu = transport->user->mtu;
+ dev->netdev_ops = ¨_netdev_ops;
+ dev->ethtool_ops = ¨_net_ethtool_ops;
+ dev->watchdog_timeo = (HZ >> 1);
+ dev->irq = UM_ETH_IRQ;
+
+ err = update_drop_skb(lp->max_packet);
+ if (err)
+ goto out_undo_user_init;
+
+ rtnl_lock();
+ err = register_netdevice(dev);
+ rtnl_unlock();
+ if (err)
+ goto out_undo_user_init;
+
+ spin_lock(&devices_lock);
+ list_add(&device->list, &devices);
+ spin_unlock(&devices_lock);
+
+ return;
+
+out_undo_user_init:
+ if (transport->user->remove != NULL)
+ (*transport->user->remove)(&lp->user);
+out_unregister:
+ platform_device_unregister(&device->pdev);
+ return; /* platform_device_unregister frees dev and device */
+out_free_netdev:
+ free_netdev(dev);
+out_free_device:
+ kfree(device);
+}
+
+static struct uml_net *find_device(int n)
+{
+ struct uml_net *device;
+ struct list_head *ele;
+
+ spin_lock(&devices_lock);
+ list_for_each(ele, &devices) {
+ device = list_entry(ele, struct uml_net, list);
+ if (device->index == n)
+ goto out;
+ }
+ device = NULL;
+ out:
+ spin_unlock(&devices_lock);
+ return device;
+}
+
+static int eth_parse(char *str, int *index_out, char **str_out,
+ char **error_out)
+{
+ char *end;
+ int n, err = -EINVAL;
+
+ n = simple_strtoul(str, &end, 0);
+ if (end == str) {
+ *error_out = "Bad device number";
+ return err;
+ }
+
+ str = end;
+ if (*str != '=') {
+ *error_out = "Expected '=' after device number";
+ return err;
+ }
+
+ str++;
+ if (find_device(n)) {
+ *error_out = "Device already configured";
+ return err;
+ }
+
+ *index_out = n;
+ *str_out = str;
+ return 0;
+}
+
+struct eth_init {
+ struct list_head list;
+ char *init;
+ int index;
+};
+
+static DEFINE_SPINLOCK(transports_lock);
+static LIST_HEAD(transports);
+
+/* Filled in during early boot */
+static LIST_HEAD(eth_cmd_line);
+
+static int check_transport(struct transport *transport, char *eth, int n,
+ void **init_out, char **mac_out, gfp_t gfp_mask)
+{
+ int len;
+
+ len = strlen(transport->name);
+ if (strncmp(eth, transport->name, len))
+ return 0;
+
+ eth += len;
+ if (*eth == ',')
+ eth++;
+ else if (*eth != '\0')
+ return 0;
+
+ *init_out = kmalloc(transport->setup_size, gfp_mask);
+ if (*init_out == NULL)
+ return 1;
+
+ if (!transport->setup(eth, mac_out, *init_out)) {
+ kfree(*init_out);
+ *init_out = NULL;
+ }
+ return 1;
+}
+
+void register_transport(struct transport *new)
+{
+ struct list_head *ele, *next;
+ struct eth_init *eth;
+ void *init;
+ char *mac = NULL;
+ int match;
+
+ spin_lock(&transports_lock);
+ BUG_ON(!list_empty(&new->list));
+ list_add(&new->list, &transports);
+ spin_unlock(&transports_lock);
+
+ list_for_each_safe(ele, next, ð_cmd_line) {
+ eth = list_entry(ele, struct eth_init, list);
+ match = check_transport(new, eth->init, eth->index, &init,
+ &mac, GFP_KERNEL);
+ if (!match)
+ continue;
+ else if (init != NULL) {
+ eth_configure(eth->index, init, mac, new, GFP_KERNEL);
+ kfree(init);
+ }
+ list_del(ð->list);
+ }
+}
+
+static int eth_setup_common(char *str, int index)
+{
+ struct list_head *ele;
+ struct transport *transport;
+ void *init;
+ char *mac = NULL;
+ int found = 0;
+
+ spin_lock(&transports_lock);
+ list_for_each(ele, &transports) {
+ transport = list_entry(ele, struct transport, list);
+ if (!check_transport(transport, str, index, &init,
+ &mac, GFP_ATOMIC))
+ continue;
+ if (init != NULL) {
+ eth_configure(index, init, mac, transport, GFP_ATOMIC);
+ kfree(init);
+ }
+ found = 1;
+ break;
+ }
+
+ spin_unlock(&transports_lock);
+ return found;
+}
+
+static int __init eth_setup(char *str)
+{
+ struct eth_init *new;
+ char *error;
+ int n, err;
+
+ err = eth_parse(str, &n, &str, &error);
+ if (err) {
+ printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",
+ str, error);
+ return 1;
+ }
+
+ new = alloc_bootmem(sizeof(*new));
+
+ INIT_LIST_HEAD(&new->list);
+ new->index = n;
+ new->init = str;
+
+ list_add_tail(&new->list, ð_cmd_line);
+ return 1;
+}
+
+__setup("eth", eth_setup);
+__uml_help(eth_setup,
+"eth[0-9]+=<transport>,<options>\n"
+" Configure a network device.\n\n"
+);
+
+static int net_config(char *str, char **error_out)
+{
+ int n, err;
+
+ err = eth_parse(str, &n, &str, error_out);
+ if (err)
+ return err;
+
+ /* This string is broken up and the pieces used by the underlying
+ * driver. So, it is freed only if eth_setup_common fails.
+ */
+ str = kstrdup(str, GFP_KERNEL);
+ if (str == NULL) {
+ *error_out = "net_config failed to strdup string";
+ return -ENOMEM;
+ }
+ err = !eth_setup_common(str, n);
+ if (err)
+ kfree(str);
+ return err;
+}
+
+static int net_id(char **str, int *start_out, int *end_out)
+{
+ char *end;
+ int n;
+
+ n = simple_strtoul(*str, &end, 0);
+ if ((*end != '\0') || (end == *str))
+ return -1;
+
+ *start_out = n;
+ *end_out = n;
+ *str = end;
+ return n;
+}
+
+static int net_remove(int n, char **error_out)
+{
+ struct uml_net *device;
+ struct net_device *dev;
+ struct uml_net_private *lp;
+
+ device = find_device(n);
+ if (device == NULL)
+ return -ENODEV;
+
+ dev = device->dev;
+ lp = netdev_priv(dev);
+ if (lp->fd > 0)
+ return -EBUSY;
+ unregister_netdev(dev);
+ platform_device_unregister(&device->pdev);
+
+ return 0;
+}
+
+static struct mc_device net_mc = {
+ .list = LIST_HEAD_INIT(net_mc.list),
+ .name = "eth",
+ .config = net_config,
+ .get_config = NULL,
+ .id = net_id,
+ .remove = net_remove,
+};
+
+#ifdef CONFIG_INET
+static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
+ void *ptr)
+{
+ struct in_ifaddr *ifa = ptr;
+ struct net_device *dev = ifa->ifa_dev->dev;
+ struct uml_net_private *lp;
+ void (*proc)(unsigned char *, unsigned char *, void *);
+ unsigned char addr_buf[4], netmask_buf[4];
+
+ if (dev->netdev_ops->ndo_open != uml_net_open)
+ return NOTIFY_DONE;
+
+ lp = netdev_priv(dev);
+
+ proc = NULL;
+ switch (event) {
+ case NETDEV_UP:
+ proc = lp->add_address;
+ break;
+ case NETDEV_DOWN:
+ proc = lp->delete_address;
+ break;
+ }
+ if (proc != NULL) {
+ memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
+ memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
+ (*proc)(addr_buf, netmask_buf, &lp->user);
+ }
+ return NOTIFY_DONE;
+}
+
+/* uml_net_init shouldn't be called twice on two CPUs at the same time */
+static struct notifier_block uml_inetaddr_notifier = {
+ .notifier_call = uml_inetaddr_event,
+};
+
+static void inet_register(void)
+{
+ struct list_head *ele;
+ struct uml_net_private *lp;
+ struct in_device *ip;
+ struct in_ifaddr *in;
+
+ register_inetaddr_notifier(¨_inetaddr_notifier);
+
+ /* Devices may have been opened already, so the uml_inetaddr_notifier
+ * didn't get a chance to run for them. This fakes it so that
+ * addresses which have already been set up get handled properly.
+ */
+ spin_lock(&opened_lock);
+ list_for_each(ele, &opened) {
+ lp = list_entry(ele, struct uml_net_private, list);
+ ip = lp->dev->ip_ptr;
+ if (ip == NULL)
+ continue;
+ in = ip->ifa_list;
+ while (in != NULL) {
+ uml_inetaddr_event(NULL, NETDEV_UP, in);
+ in = in->ifa_next;
+ }
+ }
+ spin_unlock(&opened_lock);
+}
+#else
+static inline void inet_register(void)
+{
+}
+#endif
+
+static int uml_net_init(void)
+{
+ mconsole_register_dev(&net_mc);
+ inet_register();
+ return 0;
+}
+
+__initcall(uml_net_init);
+
+static void close_devices(void)
+{
+ struct list_head *ele;
+ struct uml_net_private *lp;
+
+ spin_lock(&opened_lock);
+ list_for_each(ele, &opened) {
+ lp = list_entry(ele, struct uml_net_private, list);
+ um_free_irq(lp->dev->irq, lp->dev);
+ if ((lp->close != NULL) && (lp->fd >= 0))
+ (*lp->close)(lp->fd, &lp->user);
+ if (lp->remove != NULL)
+ (*lp->remove)(&lp->user);
+ }
+ spin_unlock(&opened_lock);
+}
+
+__uml_exitcall(close_devices);
+
+void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
+ void *),
+ void *arg)
+{
+ struct net_device *dev = d;
+ struct in_device *ip = dev->ip_ptr;
+ struct in_ifaddr *in;
+ unsigned char address[4], netmask[4];
+
+ if (ip == NULL) return;
+ in = ip->ifa_list;
+ while (in != NULL) {
+ memcpy(address, &in->ifa_address, sizeof(address));
+ memcpy(netmask, &in->ifa_mask, sizeof(netmask));
+ (*cb)(address, netmask, arg);
+ in = in->ifa_next;
+ }
+}
+
+int dev_netmask(void *d, void *m)
+{
+ struct net_device *dev = d;
+ struct in_device *ip = dev->ip_ptr;
+ struct in_ifaddr *in;
+ __be32 *mask_out = m;
+
+ if (ip == NULL)
+ return 1;
+
+ in = ip->ifa_list;
+ if (in == NULL)
+ return 1;
+
+ *mask_out = in->ifa_mask;
+ return 0;
+}
+
+void *get_output_buffer(int *len_out)
+{
+ void *ret;
+
+ ret = (void *) __get_free_pages(GFP_KERNEL, 0);
+ if (ret) *len_out = PAGE_SIZE;
+ else *len_out = 0;
+ return ret;
+}
+
+void free_output_buffer(void *buffer)
+{
+ free_pages((unsigned long) buffer, 0);
+}
+
+int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
+ char **gate_addr)
+{
+ char *remain;
+
+ remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
+ if (remain != NULL) {
+ printk(KERN_ERR "tap_setup_common - Extra garbage on "
+ "specification : '%s'\n", remain);
+ return 1;
+ }
+
+ return 0;
+}
+
+unsigned short eth_protocol(struct sk_buff *skb)
+{
+ return eth_type_trans(skb, skb->dev);
+}
diff --git a/arch/um/drivers/net_user.c b/arch/um/drivers/net_user.c
new file mode 100644
index 0000000..e9f8445
--- /dev/null
+++ b/arch/um/drivers/net_user.c
@@ -0,0 +1,271 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <stdarg.h>
+#include <errno.h>
+#include <stddef.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include <net_user.h>
+#include <os.h>
+#include <um_malloc.h>
+
+int tap_open_common(void *dev, char *gate_addr)
+{
+ int tap_addr[4];
+
+ if (gate_addr == NULL)
+ return 0;
+ if (sscanf(gate_addr, "%d.%d.%d.%d", &tap_addr[0],
+ &tap_addr[1], &tap_addr[2], &tap_addr[3]) != 4) {
+ printk(UM_KERN_ERR "Invalid tap IP address - '%s'\n",
+ gate_addr);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+void tap_check_ips(char *gate_addr, unsigned char *eth_addr)
+{
+ int tap_addr[4];
+
+ if ((gate_addr != NULL) &&
+ (sscanf(gate_addr, "%d.%d.%d.%d", &tap_addr[0],
+ &tap_addr[1], &tap_addr[2], &tap_addr[3]) == 4) &&
+ (eth_addr[0] == tap_addr[0]) &&
+ (eth_addr[1] == tap_addr[1]) &&
+ (eth_addr[2] == tap_addr[2]) &&
+ (eth_addr[3] == tap_addr[3])) {
+ printk(UM_KERN_ERR "The tap IP address and the UML eth IP "
+ "address must be different\n");
+ }
+}
+
+/* Do reliable error handling as this fails frequently enough. */
+void read_output(int fd, char *output, int len)
+{
+ int remain, ret, expected;
+ char c;
+ char *str;
+
+ if (output == NULL) {
+ output = &c;
+ len = sizeof(c);
+ }
+
+ *output = '\0';
+ ret = read(fd, &remain, sizeof(remain));
+
+ if (ret != sizeof(remain)) {
+ if (ret < 0)
+ ret = -errno;
+ expected = sizeof(remain);
+ str = "length";
+ goto err;
+ }
+
+ while (remain != 0) {
+ expected = (remain < len) ? remain : len;
+ ret = read(fd, output, expected);
+ if (ret != expected) {
+ if (ret < 0)
+ ret = -errno;
+ str = "data";
+ goto err;
+ }
+ remain -= ret;
+ }
+
+ return;
+
+err:
+ if (ret < 0)
+ printk(UM_KERN_ERR "read_output - read of %s failed, "
+ "errno = %d\n", str, -ret);
+ else
+ printk(UM_KERN_ERR "read_output - read of %s failed, read only "
+ "%d of %d bytes\n", str, ret, expected);
+}
+
+int net_read(int fd, void *buf, int len)
+{
+ int n;
+
+ n = read(fd, buf, len);
+
+ if ((n < 0) && (errno == EAGAIN))
+ return 0;
+ else if (n == 0)
+ return -ENOTCONN;
+ return n;
+}
+
+int net_recvfrom(int fd, void *buf, int len)
+{
+ int n;
+
+ CATCH_EINTR(n = recvfrom(fd, buf, len, 0, NULL, NULL));
+ if (n < 0) {
+ if (errno == EAGAIN)
+ return 0;
+ return -errno;
+ }
+ else if (n == 0)
+ return -ENOTCONN;
+ return n;
+}
+
+int net_write(int fd, void *buf, int len)
+{
+ int n;
+
+ n = write(fd, buf, len);
+
+ if ((n < 0) && (errno == EAGAIN))
+ return 0;
+ else if (n == 0)
+ return -ENOTCONN;
+ return n;
+}
+
+int net_send(int fd, void *buf, int len)
+{
+ int n;
+
+ CATCH_EINTR(n = send(fd, buf, len, 0));
+ if (n < 0) {
+ if (errno == EAGAIN)
+ return 0;
+ return -errno;
+ }
+ else if (n == 0)
+ return -ENOTCONN;
+ return n;
+}
+
+int net_sendto(int fd, void *buf, int len, void *to, int sock_len)
+{
+ int n;
+
+ CATCH_EINTR(n = sendto(fd, buf, len, 0, (struct sockaddr *) to,
+ sock_len));
+ if (n < 0) {
+ if (errno == EAGAIN)
+ return 0;
+ return -errno;
+ }
+ else if (n == 0)
+ return -ENOTCONN;
+ return n;
+}
+
+struct change_pre_exec_data {
+ int close_me;
+ int stdout_fd;
+};
+
+static void change_pre_exec(void *arg)
+{
+ struct change_pre_exec_data *data = arg;
+
+ close(data->close_me);
+ dup2(data->stdout_fd, 1);
+}
+
+static int change_tramp(char **argv, char *output, int output_len)
+{
+ int pid, fds[2], err;
+ struct change_pre_exec_data pe_data;
+
+ err = os_pipe(fds, 1, 0);
+ if (err < 0) {
+ printk(UM_KERN_ERR "change_tramp - pipe failed, err = %d\n",
+ -err);
+ return err;
+ }
+ pe_data.close_me = fds[0];
+ pe_data.stdout_fd = fds[1];
+ pid = run_helper(change_pre_exec, &pe_data, argv);
+
+ if (pid > 0) /* Avoid hang as we won't get data in failure case. */
+ read_output(fds[0], output, output_len);
+
+ close(fds[0]);
+ close(fds[1]);
+
+ if (pid > 0)
+ helper_wait(pid);
+ return pid;
+}
+
+static void change(char *dev, char *what, unsigned char *addr,
+ unsigned char *netmask)
+{
+ char addr_buf[sizeof("255.255.255.255\0")];
+ char netmask_buf[sizeof("255.255.255.255\0")];
+ char version[sizeof("nnnnn\0")];
+ char *argv[] = { "uml_net", version, what, dev, addr_buf,
+ netmask_buf, NULL };
+ char *output;
+ int output_len, pid;
+
+ sprintf(version, "%d", UML_NET_VERSION);
+ sprintf(addr_buf, "%d.%d.%d.%d", addr[0], addr[1], addr[2], addr[3]);
+ sprintf(netmask_buf, "%d.%d.%d.%d", netmask[0], netmask[1],
+ netmask[2], netmask[3]);
+
+ output_len = UM_KERN_PAGE_SIZE;
+ output = uml_kmalloc(output_len, UM_GFP_KERNEL);
+ if (output == NULL)
+ printk(UM_KERN_ERR "change : failed to allocate output "
+ "buffer\n");
+
+ pid = change_tramp(argv, output, output_len);
+ if (pid < 0) {
+ kfree(output);
+ return;
+ }
+
+ if (output != NULL) {
+ printk("%s", output);
+ kfree(output);
+ }
+}
+
+void open_addr(unsigned char *addr, unsigned char *netmask, void *arg)
+{
+ change(arg, "add", addr, netmask);
+}
+
+void close_addr(unsigned char *addr, unsigned char *netmask, void *arg)
+{
+ change(arg, "del", addr, netmask);
+}
+
+char *split_if_spec(char *str, ...)
+{
+ char **arg, *end, *ret = NULL;
+ va_list ap;
+
+ va_start(ap, str);
+ while ((arg = va_arg(ap, char **)) != NULL) {
+ if (*str == '\0')
+ goto out;
+ end = strchr(str, ',');
+ if (end != str)
+ *arg = str;
+ if (end == NULL)
+ goto out;
+ *end++ = '\0';
+ str = end;
+ }
+ ret = str;
+out:
+ va_end(ap);
+ return ret;
+}
diff --git a/arch/um/drivers/null.c b/arch/um/drivers/null.c
new file mode 100644
index 0000000..1049574
--- /dev/null
+++ b/arch/um/drivers/null.c
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
+ * Licensed under the GPL
+ */
+
+#include <stddef.h>
+#include <errno.h>
+#include <fcntl.h>
+#include "chan_user.h"
+#include <os.h>
+
+/* This address is used only as a unique identifier */
+static int null_chan;
+
+static void *null_init(char *str, int device, const struct chan_opts *opts)
+{
+ return &null_chan;
+}
+
+static int null_open(int input, int output, int primary, void *d,
+ char **dev_out)
+{
+ int fd;
+
+ *dev_out = NULL;
+
+ fd = open(DEV_NULL, O_RDWR);
+ return (fd < 0) ? -errno : fd;
+}
+
+static int null_read(int fd, char *c_out, void *unused)
+{
+ return -ENODEV;
+}
+
+static void null_free(void *data)
+{
+}
+
+const struct chan_ops null_ops = {
+ .type = "null",
+ .init = null_init,
+ .open = null_open,
+ .close = generic_close,
+ .read = null_read,
+ .write = generic_write,
+ .console_write = generic_console_write,
+ .window_size = generic_window_size,
+ .free = null_free,
+ .winch = 0,
+};
diff --git a/arch/um/drivers/pcap_kern.c b/arch/um/drivers/pcap_kern.c
new file mode 100644
index 0000000..be0fb57
--- /dev/null
+++ b/arch/um/drivers/pcap_kern.c
@@ -0,0 +1,113 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL.
+ */
+
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <net_kern.h>
+#include "pcap_user.h"
+
+struct pcap_init {
+ char *host_if;
+ int promisc;
+ int optimize;
+ char *filter;
+};
+
+void pcap_init(struct net_device *dev, void *data)
+{
+ struct uml_net_private *pri;
+ struct pcap_data *ppri;
+ struct pcap_init *init = data;
+
+ pri = netdev_priv(dev);
+ ppri = (struct pcap_data *) pri->user;
+ ppri->host_if = init->host_if;
+ ppri->promisc = init->promisc;
+ ppri->optimize = init->optimize;
+ ppri->filter = init->filter;
+
+ printk("pcap backend, host interface %s\n", ppri->host_if);
+}
+
+static int pcap_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ return pcap_user_read(fd, skb_mac_header(skb),
+ skb->dev->mtu + ETH_HEADER_OTHER,
+ (struct pcap_data *) &lp->user);
+}
+
+static int pcap_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ return -EPERM;
+}
+
+static const struct net_kern_info pcap_kern_info = {
+ .init = pcap_init,
+ .protocol = eth_protocol,
+ .read = pcap_read,
+ .write = pcap_write,
+};
+
+int pcap_setup(char *str, char **mac_out, void *data)
+{
+ struct pcap_init *init = data;
+ char *remain, *host_if = NULL, *options[2] = { NULL, NULL };
+ int i;
+
+ *init = ((struct pcap_init)
+ { .host_if = "eth0",
+ .promisc = 1,
+ .optimize = 0,
+ .filter = NULL });
+
+ remain = split_if_spec(str, &host_if, &init->filter,
+ &options[0], &options[1], mac_out, NULL);
+ if (remain != NULL) {
+ printk(KERN_ERR "pcap_setup - Extra garbage on "
+ "specification : '%s'\n", remain);
+ return 0;
+ }
+
+ if (host_if != NULL)
+ init->host_if = host_if;
+
+ for (i = 0; i < ARRAY_SIZE(options); i++) {
+ if (options[i] == NULL)
+ continue;
+ if (!strcmp(options[i], "promisc"))
+ init->promisc = 1;
+ else if (!strcmp(options[i], "nopromisc"))
+ init->promisc = 0;
+ else if (!strcmp(options[i], "optimize"))
+ init->optimize = 1;
+ else if (!strcmp(options[i], "nooptimize"))
+ init->optimize = 0;
+ else {
+ printk(KERN_ERR "pcap_setup : bad option - '%s'\n",
+ options[i]);
+ return 0;
+ }
+ }
+
+ return 1;
+}
+
+static struct transport pcap_transport = {
+ .list = LIST_HEAD_INIT(pcap_transport.list),
+ .name = "pcap",
+ .setup = pcap_setup,
+ .user = &pcap_user_info,
+ .kern = &pcap_kern_info,
+ .private_size = sizeof(struct pcap_data),
+ .setup_size = sizeof(struct pcap_init),
+};
+
+static int register_pcap(void)
+{
+ register_transport(&pcap_transport);
+ return 0;
+}
+
+late_initcall(register_pcap);
diff --git a/arch/um/drivers/pcap_user.c b/arch/um/drivers/pcap_user.c
new file mode 100644
index 0000000..c07b9c7
--- /dev/null
+++ b/arch/um/drivers/pcap_user.c
@@ -0,0 +1,137 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL.
+ */
+
+#include <errno.h>
+#include <pcap.h>
+#include <string.h>
+#include <asm/types.h>
+#include <net_user.h>
+#include "pcap_user.h"
+#include <um_malloc.h>
+
+#define PCAP_FD(p) (*(int *)(p))
+
+static int pcap_user_init(void *data, void *dev)
+{
+ struct pcap_data *pri = data;
+ pcap_t *p;
+ char errors[PCAP_ERRBUF_SIZE];
+
+ p = pcap_open_live(pri->host_if, ETH_MAX_PACKET + ETH_HEADER_OTHER,
+ pri->promisc, 0, errors);
+ if (p == NULL) {
+ printk(UM_KERN_ERR "pcap_user_init : pcap_open_live failed - "
+ "'%s'\n", errors);
+ return -EINVAL;
+ }
+
+ pri->dev = dev;
+ pri->pcap = p;
+ return 0;
+}
+
+static int pcap_open(void *data)
+{
+ struct pcap_data *pri = data;
+ __u32 netmask;
+ int err;
+
+ if (pri->pcap == NULL)
+ return -ENODEV;
+
+ if (pri->filter != NULL) {
+ err = dev_netmask(pri->dev, &netmask);
+ if (err < 0) {
+ printk(UM_KERN_ERR "pcap_open : dev_netmask failed\n");
+ return -EIO;
+ }
+
+ pri->compiled = uml_kmalloc(sizeof(struct bpf_program),
+ UM_GFP_KERNEL);
+ if (pri->compiled == NULL) {
+ printk(UM_KERN_ERR "pcap_open : kmalloc failed\n");
+ return -ENOMEM;
+ }
+
+ err = pcap_compile(pri->pcap,
+ (struct bpf_program *) pri->compiled,
+ pri->filter, pri->optimize, netmask);
+ if (err < 0) {
+ printk(UM_KERN_ERR "pcap_open : pcap_compile failed - "
+ "'%s'\n", pcap_geterr(pri->pcap));
+ goto out;
+ }
+
+ err = pcap_setfilter(pri->pcap, pri->compiled);
+ if (err < 0) {
+ printk(UM_KERN_ERR "pcap_open : pcap_setfilter "
+ "failed - '%s'\n", pcap_geterr(pri->pcap));
+ goto out;
+ }
+ }
+
+ return PCAP_FD(pri->pcap);
+
+ out:
+ kfree(pri->compiled);
+ return -EIO;
+}
+
+static void pcap_remove(void *data)
+{
+ struct pcap_data *pri = data;
+
+ if (pri->compiled != NULL)
+ pcap_freecode(pri->compiled);
+
+ if (pri->pcap != NULL)
+ pcap_close(pri->pcap);
+}
+
+struct pcap_handler_data {
+ char *buffer;
+ int len;
+};
+
+static void handler(u_char *data, const struct pcap_pkthdr *header,
+ const u_char *packet)
+{
+ int len;
+
+ struct pcap_handler_data *hdata = (struct pcap_handler_data *) data;
+
+ len = hdata->len < header->caplen ? hdata->len : header->caplen;
+ memcpy(hdata->buffer, packet, len);
+ hdata->len = len;
+}
+
+int pcap_user_read(int fd, void *buffer, int len, struct pcap_data *pri)
+{
+ struct pcap_handler_data hdata = ((struct pcap_handler_data)
+ { .buffer = buffer,
+ .len = len });
+ int n;
+
+ n = pcap_dispatch(pri->pcap, 1, handler, (u_char *) &hdata);
+ if (n < 0) {
+ printk(UM_KERN_ERR "pcap_dispatch failed - %s\n",
+ pcap_geterr(pri->pcap));
+ return -EIO;
+ }
+ else if (n == 0)
+ return 0;
+ return hdata.len;
+}
+
+const struct net_user_info pcap_user_info = {
+ .init = pcap_user_init,
+ .open = pcap_open,
+ .close = NULL,
+ .remove = pcap_remove,
+ .add_address = NULL,
+ .delete_address = NULL,
+ .mtu = ETH_MAX_PACKET,
+ .max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
+};
diff --git a/arch/um/drivers/pcap_user.h b/arch/um/drivers/pcap_user.h
new file mode 100644
index 0000000..1ca7c76
--- /dev/null
+++ b/arch/um/drivers/pcap_user.h
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <net_user.h>
+
+struct pcap_data {
+ char *host_if;
+ int promisc;
+ int optimize;
+ char *filter;
+ void *compiled;
+ void *pcap;
+ void *dev;
+};
+
+extern const struct net_user_info pcap_user_info;
+
+extern int pcap_user_read(int fd, void *buf, int len, struct pcap_data *pri);
+
diff --git a/arch/um/drivers/port.h b/arch/um/drivers/port.h
new file mode 100644
index 0000000..372a80c
--- /dev/null
+++ b/arch/um/drivers/port.h
@@ -0,0 +1,20 @@
+/*
+ * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __PORT_H__
+#define __PORT_H__
+
+extern void *port_data(int port);
+extern int port_wait(void *data);
+extern void port_kern_close(void *d);
+extern int port_connection(int fd, int *socket_out, int *pid_out);
+extern int port_listen_fd(int port);
+extern void port_read(int fd, void *data);
+extern void port_kern_free(void *d);
+extern int port_rcv_fd(int fd);
+extern void port_remove_dev(void *d);
+
+#endif
+
diff --git a/arch/um/drivers/port_kern.c b/arch/um/drivers/port_kern.c
new file mode 100644
index 0000000..40ca5cc
--- /dev/null
+++ b/arch/um/drivers/port_kern.c
@@ -0,0 +1,304 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/completion.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+#include <asm/atomic.h>
+#include <init.h>
+#include <irq_kern.h>
+#include <os.h>
+#include "port.h"
+
+struct port_list {
+ struct list_head list;
+ atomic_t wait_count;
+ int has_connection;
+ struct completion done;
+ int port;
+ int fd;
+ spinlock_t lock;
+ struct list_head pending;
+ struct list_head connections;
+};
+
+struct port_dev {
+ struct port_list *port;
+ int helper_pid;
+ int telnetd_pid;
+};
+
+struct connection {
+ struct list_head list;
+ int fd;
+ int helper_pid;
+ int socket[2];
+ int telnetd_pid;
+ struct port_list *port;
+};
+
+static irqreturn_t pipe_interrupt(int irq, void *data)
+{
+ struct connection *conn = data;
+ int fd;
+
+ fd = os_rcv_fd(conn->socket[0], &conn->helper_pid);
+ if (fd < 0) {
+ if (fd == -EAGAIN)
+ return IRQ_NONE;
+
+ printk(KERN_ERR "pipe_interrupt : os_rcv_fd returned %d\n",
+ -fd);
+ os_close_file(conn->fd);
+ }
+
+ list_del(&conn->list);
+
+ conn->fd = fd;
+ list_add(&conn->list, &conn->port->connections);
+
+ complete(&conn->port->done);
+ return IRQ_HANDLED;
+}
+
+#define NO_WAITER_MSG \
+ "****\n" \
+ "There are currently no UML consoles waiting for port connections.\n" \
+ "Either disconnect from one to make it available or activate some more\n" \
+ "by enabling more consoles in the UML /etc/inittab.\n" \
+ "****\n"
+
+static int port_accept(struct port_list *port)
+{
+ struct connection *conn;
+ int fd, socket[2], pid;
+
+ fd = port_connection(port->fd, socket, &pid);
+ if (fd < 0) {
+ if (fd != -EAGAIN)
+ printk(KERN_ERR "port_accept : port_connection "
+ "returned %d\n", -fd);
+ goto out;
+ }
+
+ conn = kmalloc(sizeof(*conn), GFP_ATOMIC);
+ if (conn == NULL) {
+ printk(KERN_ERR "port_accept : failed to allocate "
+ "connection\n");
+ goto out_close;
+ }
+ *conn = ((struct connection)
+ { .list = LIST_HEAD_INIT(conn->list),
+ .fd = fd,
+ .socket = { socket[0], socket[1] },
+ .telnetd_pid = pid,
+ .port = port });
+
+ if (um_request_irq(TELNETD_IRQ, socket[0], IRQ_READ, pipe_interrupt,
+ IRQF_SHARED, "telnetd", conn)) {
+ printk(KERN_ERR "port_accept : failed to get IRQ for "
+ "telnetd\n");
+ goto out_free;
+ }
+
+ if (atomic_read(&port->wait_count) == 0) {
+ os_write_file(fd, NO_WAITER_MSG, sizeof(NO_WAITER_MSG));
+ printk(KERN_ERR "No one waiting for port\n");
+ }
+ list_add(&conn->list, &port->pending);
+ return 1;
+
+ out_free:
+ kfree(conn);
+ out_close:
+ os_close_file(fd);
+ os_kill_process(pid, 1);
+ out:
+ return 0;
+}
+
+static DEFINE_MUTEX(ports_mutex);
+static LIST_HEAD(ports);
+
+static void port_work_proc(struct work_struct *unused)
+{
+ struct port_list *port;
+ struct list_head *ele;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ list_for_each(ele, &ports) {
+ port = list_entry(ele, struct port_list, list);
+ if (!port->has_connection)
+ continue;
+
+ reactivate_fd(port->fd, ACCEPT_IRQ);
+ while (port_accept(port))
+ ;
+ port->has_connection = 0;
+ }
+ local_irq_restore(flags);
+}
+
+DECLARE_WORK(port_work, port_work_proc);
+
+static irqreturn_t port_interrupt(int irq, void *data)
+{
+ struct port_list *port = data;
+
+ port->has_connection = 1;
+ schedule_work(&port_work);
+ return IRQ_HANDLED;
+}
+
+void *port_data(int port_num)
+{
+ struct list_head *ele;
+ struct port_list *port;
+ struct port_dev *dev = NULL;
+ int fd;
+
+ mutex_lock(&ports_mutex);
+ list_for_each(ele, &ports) {
+ port = list_entry(ele, struct port_list, list);
+ if (port->port == port_num)
+ goto found;
+ }
+ port = kmalloc(sizeof(struct port_list), GFP_KERNEL);
+ if (port == NULL) {
+ printk(KERN_ERR "Allocation of port list failed\n");
+ goto out;
+ }
+
+ fd = port_listen_fd(port_num);
+ if (fd < 0) {
+ printk(KERN_ERR "binding to port %d failed, errno = %d\n",
+ port_num, -fd);
+ goto out_free;
+ }
+
+ if (um_request_irq(ACCEPT_IRQ, fd, IRQ_READ, port_interrupt,
+ IRQF_SHARED, "port", port)) {
+ printk(KERN_ERR "Failed to get IRQ for port %d\n", port_num);
+ goto out_close;
+ }
+
+ *port = ((struct port_list)
+ { .list = LIST_HEAD_INIT(port->list),
+ .wait_count = ATOMIC_INIT(0),
+ .has_connection = 0,
+ .port = port_num,
+ .fd = fd,
+ .pending = LIST_HEAD_INIT(port->pending),
+ .connections = LIST_HEAD_INIT(port->connections) });
+ spin_lock_init(&port->lock);
+ init_completion(&port->done);
+ list_add(&port->list, &ports);
+
+ found:
+ dev = kmalloc(sizeof(struct port_dev), GFP_KERNEL);
+ if (dev == NULL) {
+ printk(KERN_ERR "Allocation of port device entry failed\n");
+ goto out;
+ }
+
+ *dev = ((struct port_dev) { .port = port,
+ .helper_pid = -1,
+ .telnetd_pid = -1 });
+ goto out;
+
+ out_close:
+ os_close_file(fd);
+ out_free:
+ kfree(port);
+ out:
+ mutex_unlock(&ports_mutex);
+ return dev;
+}
+
+int port_wait(void *data)
+{
+ struct port_dev *dev = data;
+ struct connection *conn;
+ struct port_list *port = dev->port;
+ int fd;
+
+ atomic_inc(&port->wait_count);
+ while (1) {
+ fd = -ERESTARTSYS;
+ if (wait_for_completion_interruptible(&port->done))
+ goto out;
+
+ spin_lock(&port->lock);
+
+ conn = list_entry(port->connections.next, struct connection,
+ list);
+ list_del(&conn->list);
+ spin_unlock(&port->lock);
+
+ os_shutdown_socket(conn->socket[0], 1, 1);
+ os_close_file(conn->socket[0]);
+ os_shutdown_socket(conn->socket[1], 1, 1);
+ os_close_file(conn->socket[1]);
+
+ /* This is done here because freeing an IRQ can't be done
+ * within the IRQ handler. So, pipe_interrupt always ups
+ * the semaphore regardless of whether it got a successful
+ * connection. Then we loop here throwing out failed
+ * connections until a good one is found.
+ */
+ um_free_irq(TELNETD_IRQ, conn);
+
+ if (conn->fd >= 0)
+ break;
+ os_close_file(conn->fd);
+ kfree(conn);
+ }
+
+ fd = conn->fd;
+ dev->helper_pid = conn->helper_pid;
+ dev->telnetd_pid = conn->telnetd_pid;
+ kfree(conn);
+ out:
+ atomic_dec(&port->wait_count);
+ return fd;
+}
+
+void port_remove_dev(void *d)
+{
+ struct port_dev *dev = d;
+
+ if (dev->helper_pid != -1)
+ os_kill_process(dev->helper_pid, 0);
+ if (dev->telnetd_pid != -1)
+ os_kill_process(dev->telnetd_pid, 1);
+ dev->helper_pid = -1;
+ dev->telnetd_pid = -1;
+}
+
+void port_kern_free(void *d)
+{
+ struct port_dev *dev = d;
+
+ port_remove_dev(dev);
+ kfree(dev);
+}
+
+static void free_port(void)
+{
+ struct list_head *ele;
+ struct port_list *port;
+
+ list_for_each(ele, &ports) {
+ port = list_entry(ele, struct port_list, list);
+ free_irq_by_fd(port->fd);
+ os_close_file(port->fd);
+ }
+}
+
+__uml_exitcall(free_port);
diff --git a/arch/um/drivers/port_user.c b/arch/um/drivers/port_user.c
new file mode 100644
index 0000000..9a8e1b6
--- /dev/null
+++ b/arch/um/drivers/port_user.c
@@ -0,0 +1,201 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <termios.h>
+#include <unistd.h>
+#include <netinet/in.h>
+#include "chan_user.h"
+#include <os.h>
+#include "port.h"
+#include <um_malloc.h>
+
+struct port_chan {
+ int raw;
+ struct termios tt;
+ void *kernel_data;
+ char dev[sizeof("32768\0")];
+};
+
+static void *port_init(char *str, int device, const struct chan_opts *opts)
+{
+ struct port_chan *data;
+ void *kern_data;
+ char *end;
+ int port;
+
+ if (*str != ':') {
+ printk(UM_KERN_ERR "port_init : channel type 'port' must "
+ "specify a port number\n");
+ return NULL;
+ }
+ str++;
+ port = strtoul(str, &end, 0);
+ if ((*end != '\0') || (end == str)) {
+ printk(UM_KERN_ERR "port_init : couldn't parse port '%s'\n",
+ str);
+ return NULL;
+ }
+
+ kern_data = port_data(port);
+ if (kern_data == NULL)
+ return NULL;
+
+ data = uml_kmalloc(sizeof(*data), UM_GFP_KERNEL);
+ if (data == NULL)
+ goto err;
+
+ *data = ((struct port_chan) { .raw = opts->raw,
+ .kernel_data = kern_data });
+ sprintf(data->dev, "%d", port);
+
+ return data;
+ err:
+ port_kern_free(kern_data);
+ return NULL;
+}
+
+static void port_free(void *d)
+{
+ struct port_chan *data = d;
+
+ port_kern_free(data->kernel_data);
+ kfree(data);
+}
+
+static int port_open(int input, int output, int primary, void *d,
+ char **dev_out)
+{
+ struct port_chan *data = d;
+ int fd, err;
+
+ fd = port_wait(data->kernel_data);
+ if ((fd >= 0) && data->raw) {
+ CATCH_EINTR(err = tcgetattr(fd, &data->tt));
+ if (err)
+ return err;
+
+ err = raw(fd);
+ if (err)
+ return err;
+ }
+ *dev_out = data->dev;
+ return fd;
+}
+
+static void port_close(int fd, void *d)
+{
+ struct port_chan *data = d;
+
+ port_remove_dev(data->kernel_data);
+ os_close_file(fd);
+}
+
+const struct chan_ops port_ops = {
+ .type = "port",
+ .init = port_init,
+ .open = port_open,
+ .close = port_close,
+ .read = generic_read,
+ .write = generic_write,
+ .console_write = generic_console_write,
+ .window_size = generic_window_size,
+ .free = port_free,
+ .winch = 1,
+};
+
+int port_listen_fd(int port)
+{
+ struct sockaddr_in addr;
+ int fd, err, arg;
+
+ fd = socket(PF_INET, SOCK_STREAM, 0);
+ if (fd == -1)
+ return -errno;
+
+ arg = 1;
+ if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &arg, sizeof(arg)) < 0) {
+ err = -errno;
+ goto out;
+ }
+
+ addr.sin_family = AF_INET;
+ addr.sin_port = htons(port);
+ addr.sin_addr.s_addr = htonl(INADDR_ANY);
+ if (bind(fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
+ err = -errno;
+ goto out;
+ }
+
+ if (listen(fd, 1) < 0) {
+ err = -errno;
+ goto out;
+ }
+
+ err = os_set_fd_block(fd, 0);
+ if (err < 0)
+ goto out;
+
+ return fd;
+ out:
+ close(fd);
+ return err;
+}
+
+struct port_pre_exec_data {
+ int sock_fd;
+ int pipe_fd;
+};
+
+static void port_pre_exec(void *arg)
+{
+ struct port_pre_exec_data *data = arg;
+
+ dup2(data->sock_fd, 0);
+ dup2(data->sock_fd, 1);
+ dup2(data->sock_fd, 2);
+ close(data->sock_fd);
+ dup2(data->pipe_fd, 3);
+ shutdown(3, SHUT_RD);
+ close(data->pipe_fd);
+}
+
+int port_connection(int fd, int *socket, int *pid_out)
+{
+ int new, err;
+ char *argv[] = { "/usr/sbin/in.telnetd", "-L",
+ "/usr/lib/uml/port-helper", NULL };
+ struct port_pre_exec_data data;
+
+ new = accept(fd, NULL, 0);
+ if (new < 0)
+ return -errno;
+
+ err = os_pipe(socket, 0, 0);
+ if (err < 0)
+ goto out_close;
+
+ data = ((struct port_pre_exec_data)
+ { .sock_fd = new,
+ .pipe_fd = socket[1] });
+
+ err = run_helper(port_pre_exec, &data, argv);
+ if (err < 0)
+ goto out_shutdown;
+
+ *pid_out = err;
+ return new;
+
+ out_shutdown:
+ shutdown(socket[0], SHUT_RDWR);
+ close(socket[0]);
+ shutdown(socket[1], SHUT_RDWR);
+ close(socket[1]);
+ out_close:
+ close(new);
+ return err;
+}
diff --git a/arch/um/drivers/pty.c b/arch/um/drivers/pty.c
new file mode 100644
index 0000000..f1fcc2c
--- /dev/null
+++ b/arch/um/drivers/pty.c
@@ -0,0 +1,165 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <string.h>
+#include <termios.h>
+#include <sys/stat.h>
+#include "chan_user.h"
+#include <os.h>
+#include <um_malloc.h>
+
+struct pty_chan {
+ void (*announce)(char *dev_name, int dev);
+ int dev;
+ int raw;
+ struct termios tt;
+ char dev_name[sizeof("/dev/pts/0123456\0")];
+};
+
+static void *pty_chan_init(char *str, int device, const struct chan_opts *opts)
+{
+ struct pty_chan *data;
+
+ data = uml_kmalloc(sizeof(*data), UM_GFP_KERNEL);
+ if (data == NULL)
+ return NULL;
+
+ *data = ((struct pty_chan) { .announce = opts->announce,
+ .dev = device,
+ .raw = opts->raw });
+ return data;
+}
+
+static int pts_open(int input, int output, int primary, void *d,
+ char **dev_out)
+{
+ struct pty_chan *data = d;
+ char *dev;
+ int fd, err;
+
+ fd = get_pty();
+ if (fd < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "open_pts : Failed to open pts\n");
+ return err;
+ }
+
+ if (data->raw) {
+ CATCH_EINTR(err = tcgetattr(fd, &data->tt));
+ if (err)
+ goto out_close;
+
+ err = raw(fd);
+ if (err)
+ goto out_close;
+ }
+
+ dev = ptsname(fd);
+ sprintf(data->dev_name, "%s", dev);
+ *dev_out = data->dev_name;
+
+ if (data->announce)
+ (*data->announce)(dev, data->dev);
+
+ return fd;
+
+out_close:
+ close(fd);
+ return err;
+}
+
+static int getmaster(char *line)
+{
+ struct stat buf;
+ char *pty, *bank, *cp;
+ int master, err;
+
+ pty = &line[strlen("/dev/ptyp")];
+ for (bank = "pqrs"; *bank; bank++) {
+ line[strlen("/dev/pty")] = *bank;
+ *pty = '0';
+ /* Did we hit the end ? */
+ if ((stat(line, &buf) < 0) && (errno == ENOENT))
+ break;
+
+ for (cp = "0123456789abcdef"; *cp; cp++) {
+ *pty = *cp;
+ master = open(line, O_RDWR);
+ if (master >= 0) {
+ char *tp = &line[strlen("/dev/")];
+
+ /* verify slave side is usable */
+ *tp = 't';
+ err = access(line, R_OK | W_OK);
+ *tp = 'p';
+ if (!err)
+ return master;
+ close(master);
+ }
+ }
+ }
+
+ printk(UM_KERN_ERR "getmaster - no usable host pty devices\n");
+ return -ENOENT;
+}
+
+static int pty_open(int input, int output, int primary, void *d,
+ char **dev_out)
+{
+ struct pty_chan *data = d;
+ int fd, err;
+ char dev[sizeof("/dev/ptyxx\0")] = "/dev/ptyxx";
+
+ fd = getmaster(dev);
+ if (fd < 0)
+ return fd;
+
+ if (data->raw) {
+ err = raw(fd);
+ if (err) {
+ close(fd);
+ return err;
+ }
+ }
+
+ if (data->announce)
+ (*data->announce)(dev, data->dev);
+
+ sprintf(data->dev_name, "%s", dev);
+ *dev_out = data->dev_name;
+
+ return fd;
+}
+
+const struct chan_ops pty_ops = {
+ .type = "pty",
+ .init = pty_chan_init,
+ .open = pty_open,
+ .close = generic_close,
+ .read = generic_read,
+ .write = generic_write,
+ .console_write = generic_console_write,
+ .window_size = generic_window_size,
+ .free = generic_free,
+ .winch = 0,
+};
+
+const struct chan_ops pts_ops = {
+ .type = "pts",
+ .init = pty_chan_init,
+ .open = pts_open,
+ .close = generic_close,
+ .read = generic_read,
+ .write = generic_write,
+ .console_write = generic_console_write,
+ .window_size = generic_window_size,
+ .free = generic_free,
+ .winch = 0,
+};
diff --git a/arch/um/drivers/random.c b/arch/um/drivers/random.c
new file mode 100644
index 0000000..dd16c90
--- /dev/null
+++ b/arch/um/drivers/random.c
@@ -0,0 +1,167 @@
+/* Copyright (C) 2005 - 2008 Jeff Dike <jdike@{linux.intel,addtoit}.com> */
+
+/* Much of this ripped from drivers/char/hw_random.c, see there for other
+ * copyright.
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ */
+#include <linux/sched.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/interrupt.h>
+#include <linux/miscdevice.h>
+#include <linux/delay.h>
+#include <asm/uaccess.h>
+#include <irq_kern.h>
+#include <os.h>
+
+/*
+ * core module and version information
+ */
+#define RNG_VERSION "1.0.0"
+#define RNG_MODULE_NAME "hw_random"
+
+#define RNG_MISCDEV_MINOR 183 /* official */
+
+/* Changed at init time, in the non-modular case, and at module load
+ * time, in the module case. Presumably, the module subsystem
+ * protects against a module being loaded twice at the same time.
+ */
+static int random_fd = -1;
+static DECLARE_WAIT_QUEUE_HEAD(host_read_wait);
+
+static int rng_dev_open (struct inode *inode, struct file *filp)
+{
+ /* enforce read-only access to this chrdev */
+ if ((filp->f_mode & FMODE_READ) == 0)
+ return -EINVAL;
+ if ((filp->f_mode & FMODE_WRITE) != 0)
+ return -EINVAL;
+
+ return 0;
+}
+
+static atomic_t host_sleep_count = ATOMIC_INIT(0);
+
+static ssize_t rng_dev_read (struct file *filp, char __user *buf, size_t size,
+ loff_t *offp)
+{
+ u32 data;
+ int n, ret = 0, have_data;
+
+ while (size) {
+ n = os_read_file(random_fd, &data, sizeof(data));
+ if (n > 0) {
+ have_data = n;
+ while (have_data && size) {
+ if (put_user((u8) data, buf++)) {
+ ret = ret ? : -EFAULT;
+ break;
+ }
+ size--;
+ ret++;
+ have_data--;
+ data >>= 8;
+ }
+ }
+ else if (n == -EAGAIN) {
+ DECLARE_WAITQUEUE(wait, current);
+
+ if (filp->f_flags & O_NONBLOCK)
+ return ret ? : -EAGAIN;
+
+ atomic_inc(&host_sleep_count);
+ reactivate_fd(random_fd, RANDOM_IRQ);
+ add_sigio_fd(random_fd);
+
+ add_wait_queue(&host_read_wait, &wait);
+ set_task_state(current, TASK_INTERRUPTIBLE);
+
+ schedule();
+ remove_wait_queue(&host_read_wait, &wait);
+
+ if (atomic_dec_and_test(&host_sleep_count)) {
+ ignore_sigio_fd(random_fd);
+ deactivate_fd(random_fd, RANDOM_IRQ);
+ }
+ }
+ else
+ return n;
+
+ if (signal_pending (current))
+ return ret ? : -ERESTARTSYS;
+ }
+ return ret;
+}
+
+static const struct file_operations rng_chrdev_ops = {
+ .owner = THIS_MODULE,
+ .open = rng_dev_open,
+ .read = rng_dev_read,
+ .llseek = noop_llseek,
+};
+
+/* rng_init shouldn't be called more than once at boot time */
+static struct miscdevice rng_miscdev = {
+ RNG_MISCDEV_MINOR,
+ RNG_MODULE_NAME,
+ &rng_chrdev_ops,
+};
+
+static irqreturn_t random_interrupt(int irq, void *data)
+{
+ wake_up(&host_read_wait);
+
+ return IRQ_HANDLED;
+}
+
+/*
+ * rng_init - initialize RNG module
+ */
+static int __init rng_init (void)
+{
+ int err;
+
+ err = os_open_file("/dev/random", of_read(OPENFLAGS()), 0);
+ if (err < 0)
+ goto out;
+
+ random_fd = err;
+
+ err = um_request_irq(RANDOM_IRQ, random_fd, IRQ_READ, random_interrupt,
+ 0, "random", NULL);
+ if (err)
+ goto err_out_cleanup_hw;
+
+ sigio_broken(random_fd, 1);
+
+ err = misc_register (&rng_miscdev);
+ if (err) {
+ printk (KERN_ERR RNG_MODULE_NAME ": misc device register "
+ "failed\n");
+ goto err_out_cleanup_hw;
+ }
+out:
+ return err;
+
+err_out_cleanup_hw:
+ os_close_file(random_fd);
+ random_fd = -1;
+ goto out;
+}
+
+/*
+ * rng_cleanup - shutdown RNG module
+ */
+static void __exit rng_cleanup (void)
+{
+ os_close_file(random_fd);
+ misc_deregister (&rng_miscdev);
+}
+
+module_init (rng_init);
+module_exit (rng_cleanup);
+
+MODULE_DESCRIPTION("UML Host Random Number Generator (RNG) driver");
+MODULE_LICENSE("GPL");
diff --git a/arch/um/drivers/slip.h b/arch/um/drivers/slip.h
new file mode 100644
index 0000000..c64f8c6
--- /dev/null
+++ b/arch/um/drivers/slip.h
@@ -0,0 +1,20 @@
+#ifndef __UM_SLIP_H
+#define __UM_SLIP_H
+
+#include "slip_common.h"
+
+struct slip_data {
+ void *dev;
+ char name[sizeof("slnnnnn\0")];
+ char *addr;
+ char *gate_addr;
+ int slave;
+ struct slip_proto slip;
+};
+
+extern const struct net_user_info slip_user_info;
+
+extern int slip_user_read(int fd, void *buf, int len, struct slip_data *pri);
+extern int slip_user_write(int fd, void *buf, int len, struct slip_data *pri);
+
+#endif
diff --git a/arch/um/drivers/slip_common.c b/arch/um/drivers/slip_common.c
new file mode 100644
index 0000000..f597fa7
--- /dev/null
+++ b/arch/um/drivers/slip_common.c
@@ -0,0 +1,54 @@
+#include <string.h>
+#include "slip_common.h"
+#include <net_user.h>
+
+int slip_proto_read(int fd, void *buf, int len, struct slip_proto *slip)
+{
+ int i, n, size, start;
+
+ if(slip->more > 0){
+ i = 0;
+ while(i < slip->more){
+ size = slip_unesc(slip->ibuf[i++], slip->ibuf,
+ &slip->pos, &slip->esc);
+ if(size){
+ memcpy(buf, slip->ibuf, size);
+ memmove(slip->ibuf, &slip->ibuf[i],
+ slip->more - i);
+ slip->more = slip->more - i;
+ return size;
+ }
+ }
+ slip->more = 0;
+ }
+
+ n = net_read(fd, &slip->ibuf[slip->pos],
+ sizeof(slip->ibuf) - slip->pos);
+ if(n <= 0)
+ return n;
+
+ start = slip->pos;
+ for(i = 0; i < n; i++){
+ size = slip_unesc(slip->ibuf[start + i], slip->ibuf,&slip->pos,
+ &slip->esc);
+ if(size){
+ memcpy(buf, slip->ibuf, size);
+ memmove(slip->ibuf, &slip->ibuf[start+i+1],
+ n - (i + 1));
+ slip->more = n - (i + 1);
+ return size;
+ }
+ }
+ return 0;
+}
+
+int slip_proto_write(int fd, void *buf, int len, struct slip_proto *slip)
+{
+ int actual, n;
+
+ actual = slip_esc(buf, slip->obuf, len);
+ n = net_write(fd, slip->obuf, actual);
+ if(n < 0)
+ return n;
+ else return len;
+}
diff --git a/arch/um/drivers/slip_common.h b/arch/um/drivers/slip_common.h
new file mode 100644
index 0000000..d574e0a
--- /dev/null
+++ b/arch/um/drivers/slip_common.h
@@ -0,0 +1,105 @@
+#ifndef __UM_SLIP_COMMON_H
+#define __UM_SLIP_COMMON_H
+
+#define BUF_SIZE 1500
+ /* two bytes each for a (pathological) max packet of escaped chars + *
+ * terminating END char + initial END char */
+#define ENC_BUF_SIZE (2 * BUF_SIZE + 2)
+
+/* SLIP protocol characters. */
+#define SLIP_END 0300 /* indicates end of frame */
+#define SLIP_ESC 0333 /* indicates byte stuffing */
+#define SLIP_ESC_END 0334 /* ESC ESC_END means END 'data' */
+#define SLIP_ESC_ESC 0335 /* ESC ESC_ESC means ESC 'data' */
+
+static inline int slip_unesc(unsigned char c, unsigned char *buf, int *pos,
+ int *esc)
+{
+ int ret;
+
+ switch(c){
+ case SLIP_END:
+ *esc = 0;
+ ret=*pos;
+ *pos=0;
+ return(ret);
+ case SLIP_ESC:
+ *esc = 1;
+ return(0);
+ case SLIP_ESC_ESC:
+ if(*esc){
+ *esc = 0;
+ c = SLIP_ESC;
+ }
+ break;
+ case SLIP_ESC_END:
+ if(*esc){
+ *esc = 0;
+ c = SLIP_END;
+ }
+ break;
+ }
+ buf[(*pos)++] = c;
+ return(0);
+}
+
+static inline int slip_esc(unsigned char *s, unsigned char *d, int len)
+{
+ unsigned char *ptr = d;
+ unsigned char c;
+
+ /*
+ * Send an initial END character to flush out any
+ * data that may have accumulated in the receiver
+ * due to line noise.
+ */
+
+ *ptr++ = SLIP_END;
+
+ /*
+ * For each byte in the packet, send the appropriate
+ * character sequence, according to the SLIP protocol.
+ */
+
+ while (len-- > 0) {
+ switch(c = *s++) {
+ case SLIP_END:
+ *ptr++ = SLIP_ESC;
+ *ptr++ = SLIP_ESC_END;
+ break;
+ case SLIP_ESC:
+ *ptr++ = SLIP_ESC;
+ *ptr++ = SLIP_ESC_ESC;
+ break;
+ default:
+ *ptr++ = c;
+ break;
+ }
+ }
+ *ptr++ = SLIP_END;
+ return (ptr - d);
+}
+
+struct slip_proto {
+ unsigned char ibuf[ENC_BUF_SIZE];
+ unsigned char obuf[ENC_BUF_SIZE];
+ int more; /* more data: do not read fd until ibuf has been drained */
+ int pos;
+ int esc;
+};
+
+static inline void slip_proto_init(struct slip_proto * slip)
+{
+ memset(slip->ibuf, 0, sizeof(slip->ibuf));
+ memset(slip->obuf, 0, sizeof(slip->obuf));
+ slip->more = 0;
+ slip->pos = 0;
+ slip->esc = 0;
+}
+
+extern int slip_proto_read(int fd, void *buf, int len,
+ struct slip_proto *slip);
+extern int slip_proto_write(int fd, void *buf, int len,
+ struct slip_proto *slip);
+
+#endif
diff --git a/arch/um/drivers/slip_kern.c b/arch/um/drivers/slip_kern.c
new file mode 100644
index 0000000..ed5249f
--- /dev/null
+++ b/arch/um/drivers/slip_kern.c
@@ -0,0 +1,93 @@
+/*
+ * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL.
+ */
+
+#include <linux/if_arp.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <net_kern.h>
+#include "slip.h"
+
+struct slip_init {
+ char *gate_addr;
+};
+
+static void slip_init(struct net_device *dev, void *data)
+{
+ struct uml_net_private *private;
+ struct slip_data *spri;
+ struct slip_init *init = data;
+
+ private = netdev_priv(dev);
+ spri = (struct slip_data *) private->user;
+
+ memset(spri->name, 0, sizeof(spri->name));
+ spri->addr = NULL;
+ spri->gate_addr = init->gate_addr;
+ spri->slave = -1;
+ spri->dev = dev;
+
+ slip_proto_init(&spri->slip);
+
+ dev->hard_header_len = 0;
+ dev->header_ops = NULL;
+ dev->addr_len = 0;
+ dev->type = ARPHRD_SLIP;
+ dev->tx_queue_len = 256;
+ dev->flags = IFF_NOARP;
+ printk("SLIP backend - SLIP IP = %s\n", spri->gate_addr);
+}
+
+static unsigned short slip_protocol(struct sk_buff *skbuff)
+{
+ return htons(ETH_P_IP);
+}
+
+static int slip_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ return slip_user_read(fd, skb_mac_header(skb), skb->dev->mtu,
+ (struct slip_data *) &lp->user);
+}
+
+static int slip_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ return slip_user_write(fd, skb->data, skb->len,
+ (struct slip_data *) &lp->user);
+}
+
+static const struct net_kern_info slip_kern_info = {
+ .init = slip_init,
+ .protocol = slip_protocol,
+ .read = slip_read,
+ .write = slip_write,
+};
+
+static int slip_setup(char *str, char **mac_out, void *data)
+{
+ struct slip_init *init = data;
+
+ *init = ((struct slip_init) { .gate_addr = NULL });
+
+ if (str[0] != '\0')
+ init->gate_addr = str;
+ return 1;
+}
+
+static struct transport slip_transport = {
+ .list = LIST_HEAD_INIT(slip_transport.list),
+ .name = "slip",
+ .setup = slip_setup,
+ .user = &slip_user_info,
+ .kern = &slip_kern_info,
+ .private_size = sizeof(struct slip_data),
+ .setup_size = sizeof(struct slip_init),
+};
+
+static int register_slip(void)
+{
+ register_transport(&slip_transport);
+ return 0;
+}
+
+late_initcall(register_slip);
diff --git a/arch/um/drivers/slip_user.c b/arch/um/drivers/slip_user.c
new file mode 100644
index 0000000..0d6b66c
--- /dev/null
+++ b/arch/um/drivers/slip_user.c
@@ -0,0 +1,251 @@
+/*
+ * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <string.h>
+#include <sys/termios.h>
+#include <sys/wait.h>
+#include <net_user.h>
+#include <os.h>
+#include "slip.h"
+#include <um_malloc.h>
+
+static int slip_user_init(void *data, void *dev)
+{
+ struct slip_data *pri = data;
+
+ pri->dev = dev;
+ return 0;
+}
+
+static int set_up_tty(int fd)
+{
+ int i;
+ struct termios tios;
+
+ if (tcgetattr(fd, &tios) < 0) {
+ printk(UM_KERN_ERR "could not get initial terminal "
+ "attributes\n");
+ return -1;
+ }
+
+ tios.c_cflag = CS8 | CREAD | HUPCL | CLOCAL;
+ tios.c_iflag = IGNBRK | IGNPAR;
+ tios.c_oflag = 0;
+ tios.c_lflag = 0;
+ for (i = 0; i < NCCS; i++)
+ tios.c_cc[i] = 0;
+ tios.c_cc[VMIN] = 1;
+ tios.c_cc[VTIME] = 0;
+
+ cfsetospeed(&tios, B38400);
+ cfsetispeed(&tios, B38400);
+
+ if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
+ printk(UM_KERN_ERR "failed to set terminal attributes\n");
+ return -1;
+ }
+ return 0;
+}
+
+struct slip_pre_exec_data {
+ int stdin_fd;
+ int stdout_fd;
+ int close_me;
+};
+
+static void slip_pre_exec(void *arg)
+{
+ struct slip_pre_exec_data *data = arg;
+
+ if (data->stdin_fd >= 0)
+ dup2(data->stdin_fd, 0);
+ dup2(data->stdout_fd, 1);
+ if (data->close_me >= 0)
+ close(data->close_me);
+}
+
+static int slip_tramp(char **argv, int fd)
+{
+ struct slip_pre_exec_data pe_data;
+ char *output;
+ int pid, fds[2], err, output_len;
+
+ err = os_pipe(fds, 1, 0);
+ if (err < 0) {
+ printk(UM_KERN_ERR "slip_tramp : pipe failed, err = %d\n",
+ -err);
+ goto out;
+ }
+
+ err = 0;
+ pe_data.stdin_fd = fd;
+ pe_data.stdout_fd = fds[1];
+ pe_data.close_me = fds[0];
+ err = run_helper(slip_pre_exec, &pe_data, argv);
+ if (err < 0)
+ goto out_close;
+ pid = err;
+
+ output_len = UM_KERN_PAGE_SIZE;
+ output = uml_kmalloc(output_len, UM_GFP_KERNEL);
+ if (output == NULL) {
+ printk(UM_KERN_ERR "slip_tramp : failed to allocate output "
+ "buffer\n");
+ os_kill_process(pid, 1);
+ err = -ENOMEM;
+ goto out_close;
+ }
+
+ close(fds[1]);
+ read_output(fds[0], output, output_len);
+ printk("%s", output);
+
+ err = helper_wait(pid);
+ close(fds[0]);
+
+ kfree(output);
+ return err;
+
+out_close:
+ close(fds[0]);
+ close(fds[1]);
+out:
+ return err;
+}
+
+static int slip_open(void *data)
+{
+ struct slip_data *pri = data;
+ char version_buf[sizeof("nnnnn\0")];
+ char gate_buf[sizeof("nnn.nnn.nnn.nnn\0")];
+ char *argv[] = { "uml_net", version_buf, "slip", "up", gate_buf,
+ NULL };
+ int sfd, mfd, err;
+
+ err = get_pty();
+ if (err < 0) {
+ printk(UM_KERN_ERR "slip-open : Failed to open pty, err = %d\n",
+ -err);
+ goto out;
+ }
+ mfd = err;
+
+ err = open(ptsname(mfd), O_RDWR, 0);
+ if (err < 0) {
+ printk(UM_KERN_ERR "Couldn't open tty for slip line, "
+ "err = %d\n", -err);
+ goto out_close;
+ }
+ sfd = err;
+
+ if (set_up_tty(sfd))
+ goto out_close2;
+
+ pri->slave = sfd;
+ pri->slip.pos = 0;
+ pri->slip.esc = 0;
+ if (pri->gate_addr != NULL) {
+ sprintf(version_buf, "%d", UML_NET_VERSION);
+ strcpy(gate_buf, pri->gate_addr);
+
+ err = slip_tramp(argv, sfd);
+
+ if (err < 0) {
+ printk(UM_KERN_ERR "slip_tramp failed - err = %d\n",
+ -err);
+ goto out_close2;
+ }
+ err = os_get_ifname(pri->slave, pri->name);
+ if (err < 0) {
+ printk(UM_KERN_ERR "get_ifname failed, err = %d\n",
+ -err);
+ goto out_close2;
+ }
+ iter_addresses(pri->dev, open_addr, pri->name);
+ }
+ else {
+ err = os_set_slip(sfd);
+ if (err < 0) {
+ printk(UM_KERN_ERR "Failed to set slip discipline "
+ "encapsulation - err = %d\n", -err);
+ goto out_close2;
+ }
+ }
+ return mfd;
+out_close2:
+ close(sfd);
+out_close:
+ close(mfd);
+out:
+ return err;
+}
+
+static void slip_close(int fd, void *data)
+{
+ struct slip_data *pri = data;
+ char version_buf[sizeof("nnnnn\0")];
+ char *argv[] = { "uml_net", version_buf, "slip", "down", pri->name,
+ NULL };
+ int err;
+
+ if (pri->gate_addr != NULL)
+ iter_addresses(pri->dev, close_addr, pri->name);
+
+ sprintf(version_buf, "%d", UML_NET_VERSION);
+
+ err = slip_tramp(argv, pri->slave);
+
+ if (err != 0)
+ printk(UM_KERN_ERR "slip_tramp failed - errno = %d\n", -err);
+ close(fd);
+ close(pri->slave);
+ pri->slave = -1;
+}
+
+int slip_user_read(int fd, void *buf, int len, struct slip_data *pri)
+{
+ return slip_proto_read(fd, buf, len, &pri->slip);
+}
+
+int slip_user_write(int fd, void *buf, int len, struct slip_data *pri)
+{
+ return slip_proto_write(fd, buf, len, &pri->slip);
+}
+
+static void slip_add_addr(unsigned char *addr, unsigned char *netmask,
+ void *data)
+{
+ struct slip_data *pri = data;
+
+ if (pri->slave < 0)
+ return;
+ open_addr(addr, netmask, pri->name);
+}
+
+static void slip_del_addr(unsigned char *addr, unsigned char *netmask,
+ void *data)
+{
+ struct slip_data *pri = data;
+
+ if (pri->slave < 0)
+ return;
+ close_addr(addr, netmask, pri->name);
+}
+
+const struct net_user_info slip_user_info = {
+ .init = slip_user_init,
+ .open = slip_open,
+ .close = slip_close,
+ .remove = NULL,
+ .add_address = slip_add_addr,
+ .delete_address = slip_del_addr,
+ .mtu = BUF_SIZE,
+ .max_packet = BUF_SIZE,
+};
diff --git a/arch/um/drivers/slirp.h b/arch/um/drivers/slirp.h
new file mode 100644
index 0000000..89ccf83
--- /dev/null
+++ b/arch/um/drivers/slirp.h
@@ -0,0 +1,33 @@
+#ifndef __UM_SLIRP_H
+#define __UM_SLIRP_H
+
+#include "slip_common.h"
+
+#define SLIRP_MAX_ARGS 100
+/*
+ * XXX this next definition is here because I don't understand why this
+ * initializer doesn't work in slirp_kern.c:
+ *
+ * argv : { init->argv[ 0 ... SLIRP_MAX_ARGS-1 ] },
+ *
+ * or why I can't typecast like this:
+ *
+ * argv : (char* [SLIRP_MAX_ARGS])(init->argv),
+ */
+struct arg_list_dummy_wrapper { char *argv[SLIRP_MAX_ARGS]; };
+
+struct slirp_data {
+ void *dev;
+ struct arg_list_dummy_wrapper argw;
+ int pid;
+ int slave;
+ struct slip_proto slip;
+};
+
+extern const struct net_user_info slirp_user_info;
+
+extern int slirp_user_read(int fd, void *buf, int len, struct slirp_data *pri);
+extern int slirp_user_write(int fd, void *buf, int len,
+ struct slirp_data *pri);
+
+#endif
diff --git a/arch/um/drivers/slirp_kern.c b/arch/um/drivers/slirp_kern.c
new file mode 100644
index 0000000..4ef11ca
--- /dev/null
+++ b/arch/um/drivers/slirp_kern.c
@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL.
+ */
+
+#include <linux/if_arp.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <linux/string.h>
+#include <net_kern.h>
+#include <net_user.h>
+#include "slirp.h"
+
+struct slirp_init {
+ struct arg_list_dummy_wrapper argw; /* XXX should be simpler... */
+};
+
+void slirp_init(struct net_device *dev, void *data)
+{
+ struct uml_net_private *private;
+ struct slirp_data *spri;
+ struct slirp_init *init = data;
+ int i;
+
+ private = netdev_priv(dev);
+ spri = (struct slirp_data *) private->user;
+
+ spri->argw = init->argw;
+ spri->pid = -1;
+ spri->slave = -1;
+ spri->dev = dev;
+
+ slip_proto_init(&spri->slip);
+
+ dev->hard_header_len = 0;
+ dev->header_ops = NULL;
+ dev->addr_len = 0;
+ dev->type = ARPHRD_SLIP;
+ dev->tx_queue_len = 256;
+ dev->flags = IFF_NOARP;
+ printk("SLIRP backend - command line:");
+ for (i = 0; spri->argw.argv[i] != NULL; i++)
+ printk(" '%s'",spri->argw.argv[i]);
+ printk("\n");
+}
+
+static unsigned short slirp_protocol(struct sk_buff *skbuff)
+{
+ return htons(ETH_P_IP);
+}
+
+static int slirp_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ return slirp_user_read(fd, skb_mac_header(skb), skb->dev->mtu,
+ (struct slirp_data *) &lp->user);
+}
+
+static int slirp_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ return slirp_user_write(fd, skb->data, skb->len,
+ (struct slirp_data *) &lp->user);
+}
+
+const struct net_kern_info slirp_kern_info = {
+ .init = slirp_init,
+ .protocol = slirp_protocol,
+ .read = slirp_read,
+ .write = slirp_write,
+};
+
+static int slirp_setup(char *str, char **mac_out, void *data)
+{
+ struct slirp_init *init = data;
+ int i=0;
+
+ *init = ((struct slirp_init) { .argw = { { "slirp", NULL } } });
+
+ str = split_if_spec(str, mac_out, NULL);
+
+ if (str == NULL) /* no command line given after MAC addr */
+ return 1;
+
+ do {
+ if (i >= SLIRP_MAX_ARGS - 1) {
+ printk(KERN_WARNING "slirp_setup: truncating slirp "
+ "arguments\n");
+ break;
+ }
+ init->argw.argv[i++] = str;
+ while(*str && *str!=',') {
+ if (*str == '_')
+ *str=' ';
+ str++;
+ }
+ if (*str != ',')
+ break;
+ *str++ = '\0';
+ } while (1);
+
+ init->argw.argv[i] = NULL;
+ return 1;
+}
+
+static struct transport slirp_transport = {
+ .list = LIST_HEAD_INIT(slirp_transport.list),
+ .name = "slirp",
+ .setup = slirp_setup,
+ .user = &slirp_user_info,
+ .kern = &slirp_kern_info,
+ .private_size = sizeof(struct slirp_data),
+ .setup_size = sizeof(struct slirp_init),
+};
+
+static int register_slirp(void)
+{
+ register_transport(&slirp_transport);
+ return 0;
+}
+
+late_initcall(register_slirp);
diff --git a/arch/um/drivers/slirp_user.c b/arch/um/drivers/slirp_user.c
new file mode 100644
index 0000000..98b6a41
--- /dev/null
+++ b/arch/um/drivers/slirp_user.c
@@ -0,0 +1,125 @@
+/*
+ * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL.
+ */
+
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/wait.h>
+#include <net_user.h>
+#include <os.h>
+#include "slirp.h"
+
+static int slirp_user_init(void *data, void *dev)
+{
+ struct slirp_data *pri = data;
+
+ pri->dev = dev;
+ return 0;
+}
+
+struct slirp_pre_exec_data {
+ int stdin_fd;
+ int stdout_fd;
+};
+
+static void slirp_pre_exec(void *arg)
+{
+ struct slirp_pre_exec_data *data = arg;
+
+ if (data->stdin_fd != -1)
+ dup2(data->stdin_fd, 0);
+ if (data->stdout_fd != -1)
+ dup2(data->stdout_fd, 1);
+}
+
+static int slirp_tramp(char **argv, int fd)
+{
+ struct slirp_pre_exec_data pe_data;
+ int pid;
+
+ pe_data.stdin_fd = fd;
+ pe_data.stdout_fd = fd;
+ pid = run_helper(slirp_pre_exec, &pe_data, argv);
+
+ return pid;
+}
+
+static int slirp_open(void *data)
+{
+ struct slirp_data *pri = data;
+ int fds[2], pid, err;
+
+ err = os_pipe(fds, 1, 1);
+ if (err)
+ return err;
+
+ err = slirp_tramp(pri->argw.argv, fds[1]);
+ if (err < 0) {
+ printk(UM_KERN_ERR "slirp_tramp failed - errno = %d\n", -err);
+ goto out;
+ }
+ pid = err;
+
+ pri->slave = fds[1];
+ pri->slip.pos = 0;
+ pri->slip.esc = 0;
+ pri->pid = err;
+
+ return fds[0];
+out:
+ close(fds[0]);
+ close(fds[1]);
+ return err;
+}
+
+static void slirp_close(int fd, void *data)
+{
+ struct slirp_data *pri = data;
+ int err;
+
+ close(fd);
+ close(pri->slave);
+
+ pri->slave = -1;
+
+ if (pri->pid<1) {
+ printk(UM_KERN_ERR "slirp_close: no child process to shut "
+ "down\n");
+ return;
+ }
+
+#if 0
+ if (kill(pri->pid, SIGHUP)<0) {
+ printk(UM_KERN_ERR "slirp_close: sending hangup to %d failed "
+ "(%d)\n", pri->pid, errno);
+ }
+#endif
+ err = helper_wait(pri->pid);
+ if (err < 0)
+ return;
+
+ pri->pid = -1;
+}
+
+int slirp_user_read(int fd, void *buf, int len, struct slirp_data *pri)
+{
+ return slip_proto_read(fd, buf, len, &pri->slip);
+}
+
+int slirp_user_write(int fd, void *buf, int len, struct slirp_data *pri)
+{
+ return slip_proto_write(fd, buf, len, &pri->slip);
+}
+
+const struct net_user_info slirp_user_info = {
+ .init = slirp_user_init,
+ .open = slirp_open,
+ .close = slirp_close,
+ .remove = NULL,
+ .add_address = NULL,
+ .delete_address = NULL,
+ .mtu = BUF_SIZE,
+ .max_packet = BUF_SIZE,
+};
diff --git a/arch/um/drivers/ssl.c b/arch/um/drivers/ssl.c
new file mode 100644
index 0000000..b8d14fa
--- /dev/null
+++ b/arch/um/drivers/ssl.c
@@ -0,0 +1,199 @@
+/*
+ * Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/fs.h>
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/major.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <asm/termbits.h>
+#include <asm/irq.h>
+#include "ssl.h"
+#include "chan.h"
+#include <init.h>
+#include <irq_user.h>
+#include "mconsole_kern.h"
+
+static const int ssl_version = 1;
+
+#define NR_PORTS 64
+
+static void ssl_announce(char *dev_name, int dev)
+{
+ printk(KERN_INFO "Serial line %d assigned device '%s'\n", dev,
+ dev_name);
+}
+
+/* Almost const, except that xterm_title may be changed in an initcall */
+static struct chan_opts opts = {
+ .announce = ssl_announce,
+ .xterm_title = "Serial Line #%d",
+ .raw = 1,
+};
+
+static int ssl_config(char *str, char **error_out);
+static int ssl_get_config(char *dev, char *str, int size, char **error_out);
+static int ssl_remove(int n, char **error_out);
+
+
+/* Const, except for .mc.list */
+static struct line_driver driver = {
+ .name = "UML serial line",
+ .device_name = "ttyS",
+ .major = TTY_MAJOR,
+ .minor_start = 64,
+ .type = TTY_DRIVER_TYPE_SERIAL,
+ .subtype = 0,
+ .read_irq = SSL_IRQ,
+ .read_irq_name = "ssl",
+ .write_irq = SSL_WRITE_IRQ,
+ .write_irq_name = "ssl-write",
+ .mc = {
+ .list = LIST_HEAD_INIT(driver.mc.list),
+ .name = "ssl",
+ .config = ssl_config,
+ .get_config = ssl_get_config,
+ .id = line_id,
+ .remove = ssl_remove,
+ },
+};
+
+/* The array is initialized by line_init, at initcall time. The
+ * elements are locked individually as needed.
+ */
+static char *conf[NR_PORTS];
+static char *def_conf = CONFIG_SSL_CHAN;
+static struct line serial_lines[NR_PORTS];
+
+static int ssl_config(char *str, char **error_out)
+{
+ return line_config(serial_lines, ARRAY_SIZE(serial_lines), str, &opts,
+ error_out);
+}
+
+static int ssl_get_config(char *dev, char *str, int size, char **error_out)
+{
+ return line_get_config(dev, serial_lines, ARRAY_SIZE(serial_lines), str,
+ size, error_out);
+}
+
+static int ssl_remove(int n, char **error_out)
+{
+ return line_remove(serial_lines, ARRAY_SIZE(serial_lines), n,
+ error_out);
+}
+
+static int ssl_install(struct tty_driver *driver, struct tty_struct *tty)
+{
+ return line_install(driver, tty, &serial_lines[tty->index]);
+}
+
+static const struct tty_operations ssl_ops = {
+ .open = line_open,
+ .close = line_close,
+ .write = line_write,
+ .put_char = line_put_char,
+ .write_room = line_write_room,
+ .chars_in_buffer = line_chars_in_buffer,
+ .flush_buffer = line_flush_buffer,
+ .flush_chars = line_flush_chars,
+ .set_termios = line_set_termios,
+ .throttle = line_throttle,
+ .unthrottle = line_unthrottle,
+ .install = ssl_install,
+ .hangup = line_hangup,
+};
+
+/* Changed by ssl_init and referenced by ssl_exit, which are both serialized
+ * by being an initcall and exitcall, respectively.
+ */
+static int ssl_init_done = 0;
+
+static void ssl_console_write(struct console *c, const char *string,
+ unsigned len)
+{
+ struct line *line = &serial_lines[c->index];
+ unsigned long flags;
+
+ spin_lock_irqsave(&line->lock, flags);
+ console_write_chan(line->chan_out, string, len);
+ spin_unlock_irqrestore(&line->lock, flags);
+}
+
+static struct tty_driver *ssl_console_device(struct console *c, int *index)
+{
+ *index = c->index;
+ return driver.driver;
+}
+
+static int ssl_console_setup(struct console *co, char *options)
+{
+ struct line *line = &serial_lines[co->index];
+
+ return console_open_chan(line, co);
+}
+
+/* No locking for register_console call - relies on single-threaded initcalls */
+static struct console ssl_cons = {
+ .name = "ttyS",
+ .write = ssl_console_write,
+ .device = ssl_console_device,
+ .setup = ssl_console_setup,
+ .flags = CON_PRINTBUFFER|CON_ANYTIME,
+ .index = -1,
+};
+
+static int ssl_init(void)
+{
+ char *new_title;
+ int err;
+ int i;
+
+ printk(KERN_INFO "Initializing software serial port version %d\n",
+ ssl_version);
+
+ err = register_lines(&driver, &ssl_ops, serial_lines,
+ ARRAY_SIZE(serial_lines));
+ if (err)
+ return err;
+
+ new_title = add_xterm_umid(opts.xterm_title);
+ if (new_title != NULL)
+ opts.xterm_title = new_title;
+
+ for (i = 0; i < NR_PORTS; i++) {
+ char *error;
+ char *s = conf[i];
+ if (!s)
+ s = def_conf;
+ if (setup_one_line(serial_lines, i, s, &opts, &error))
+ printk(KERN_ERR "setup_one_line failed for "
+ "device %d : %s\n", i, error);
+ }
+
+ ssl_init_done = 1;
+ register_console(&ssl_cons);
+ return 0;
+}
+late_initcall(ssl_init);
+
+static void ssl_exit(void)
+{
+ if (!ssl_init_done)
+ return;
+ close_lines(serial_lines, ARRAY_SIZE(serial_lines));
+}
+__uml_exitcall(ssl_exit);
+
+static int ssl_chan_setup(char *str)
+{
+ line_setup(conf, NR_PORTS, &def_conf, str, "serial line");
+ return 1;
+}
+
+__setup("ssl", ssl_chan_setup);
+__channel_help(ssl_chan_setup, "ssl");
diff --git a/arch/um/drivers/ssl.h b/arch/um/drivers/ssl.h
new file mode 100644
index 0000000..314d177
--- /dev/null
+++ b/arch/um/drivers/ssl.h
@@ -0,0 +1,13 @@
+/*
+ * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __SSL_H__
+#define __SSL_H__
+
+extern int ssl_read(int fd, int line);
+extern void ssl_receive_char(int line, char ch);
+
+#endif
+
diff --git a/arch/um/drivers/stderr_console.c b/arch/um/drivers/stderr_console.c
new file mode 100644
index 0000000..d07a97f
--- /dev/null
+++ b/arch/um/drivers/stderr_console.c
@@ -0,0 +1,62 @@
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/console.h>
+
+#include "chan_user.h"
+
+/* ----------------------------------------------------------------------------- */
+/* trivial console driver -- simply dump everything to stderr */
+
+/*
+ * Don't register by default -- as this registers very early in the
+ * boot process it becomes the default console.
+ *
+ * Initialized at init time.
+ */
+static int use_stderr_console = 0;
+
+static void stderr_console_write(struct console *console, const char *string,
+ unsigned len)
+{
+ generic_write(2 /* stderr */, string, len, NULL);
+}
+
+static struct console stderr_console = {
+ .name = "stderr",
+ .write = stderr_console_write,
+ .flags = CON_PRINTBUFFER,
+};
+
+static int __init stderr_console_init(void)
+{
+ if (use_stderr_console)
+ register_console(&stderr_console);
+ return 0;
+}
+console_initcall(stderr_console_init);
+
+static int stderr_setup(char *str)
+{
+ if (!str)
+ return 0;
+ use_stderr_console = simple_strtoul(str,&str,0);
+ return 1;
+}
+__setup("stderr=", stderr_setup);
+
+/* The previous behavior of not unregistering led to /dev/console being
+ * impossible to open. My FC5 filesystem started having init die, and the
+ * system panicing because of this. Unregistering causes the real
+ * console to become the default console, and /dev/console can then be
+ * opened. Making this an initcall makes this happen late enough that
+ * there is no added value in dumping everything to stderr, and the
+ * normal console is good enough to show you all available output.
+ */
+static int __init unregister_stderr(void)
+{
+ unregister_console(&stderr_console);
+
+ return 0;
+}
+
+__initcall(unregister_stderr);
diff --git a/arch/um/drivers/stdio_console.c b/arch/um/drivers/stdio_console.c
new file mode 100644
index 0000000..7b361f3
--- /dev/null
+++ b/arch/um/drivers/stdio_console.c
@@ -0,0 +1,199 @@
+/*
+ * Copyright (C) 2000, 2001 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/posix_types.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/types.h>
+#include <linux/major.h>
+#include <linux/kdev_t.h>
+#include <linux/console.h>
+#include <linux/string.h>
+#include <linux/sched.h>
+#include <linux/list.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/hardirq.h>
+#include <asm/current.h>
+#include <asm/irq.h>
+#include "stdio_console.h"
+#include "chan.h"
+#include <irq_user.h>
+#include "mconsole_kern.h"
+#include <init.h>
+
+#define MAX_TTYS (16)
+
+static void stdio_announce(char *dev_name, int dev)
+{
+ printk(KERN_INFO "Virtual console %d assigned device '%s'\n", dev,
+ dev_name);
+}
+
+/* Almost const, except that xterm_title may be changed in an initcall */
+static struct chan_opts opts = {
+ .announce = stdio_announce,
+ .xterm_title = "Virtual Console #%d",
+ .raw = 1,
+};
+
+static int con_config(char *str, char **error_out);
+static int con_get_config(char *dev, char *str, int size, char **error_out);
+static int con_remove(int n, char **con_remove);
+
+
+/* Const, except for .mc.list */
+static struct line_driver driver = {
+ .name = "UML console",
+ .device_name = "tty",
+ .major = TTY_MAJOR,
+ .minor_start = 0,
+ .type = TTY_DRIVER_TYPE_CONSOLE,
+ .subtype = SYSTEM_TYPE_CONSOLE,
+ .read_irq = CONSOLE_IRQ,
+ .read_irq_name = "console",
+ .write_irq = CONSOLE_WRITE_IRQ,
+ .write_irq_name = "console-write",
+ .mc = {
+ .list = LIST_HEAD_INIT(driver.mc.list),
+ .name = "con",
+ .config = con_config,
+ .get_config = con_get_config,
+ .id = line_id,
+ .remove = con_remove,
+ },
+};
+
+/* The array is initialized by line_init, at initcall time. The
+ * elements are locked individually as needed.
+ */
+static char *vt_conf[MAX_TTYS];
+static char *def_conf;
+static struct line vts[MAX_TTYS];
+
+static int con_config(char *str, char **error_out)
+{
+ return line_config(vts, ARRAY_SIZE(vts), str, &opts, error_out);
+}
+
+static int con_get_config(char *dev, char *str, int size, char **error_out)
+{
+ return line_get_config(dev, vts, ARRAY_SIZE(vts), str, size, error_out);
+}
+
+static int con_remove(int n, char **error_out)
+{
+ return line_remove(vts, ARRAY_SIZE(vts), n, error_out);
+}
+
+/* Set in an initcall, checked in an exitcall */
+static int con_init_done = 0;
+
+static int con_install(struct tty_driver *driver, struct tty_struct *tty)
+{
+ return line_install(driver, tty, &vts[tty->index]);
+}
+
+static const struct tty_operations console_ops = {
+ .open = line_open,
+ .install = con_install,
+ .close = line_close,
+ .write = line_write,
+ .put_char = line_put_char,
+ .write_room = line_write_room,
+ .chars_in_buffer = line_chars_in_buffer,
+ .flush_buffer = line_flush_buffer,
+ .flush_chars = line_flush_chars,
+ .set_termios = line_set_termios,
+ .throttle = line_throttle,
+ .unthrottle = line_unthrottle,
+ .hangup = line_hangup,
+};
+
+static void uml_console_write(struct console *console, const char *string,
+ unsigned len)
+{
+ struct line *line = &vts[console->index];
+ unsigned long flags;
+
+ spin_lock_irqsave(&line->lock, flags);
+ console_write_chan(line->chan_out, string, len);
+ spin_unlock_irqrestore(&line->lock, flags);
+}
+
+static struct tty_driver *uml_console_device(struct console *c, int *index)
+{
+ *index = c->index;
+ return driver.driver;
+}
+
+static int uml_console_setup(struct console *co, char *options)
+{
+ struct line *line = &vts[co->index];
+
+ return console_open_chan(line, co);
+}
+
+/* No locking for register_console call - relies on single-threaded initcalls */
+static struct console stdiocons = {
+ .name = "tty",
+ .write = uml_console_write,
+ .device = uml_console_device,
+ .setup = uml_console_setup,
+ .flags = CON_PRINTBUFFER|CON_ANYTIME,
+ .index = -1,
+};
+
+static int stdio_init(void)
+{
+ char *new_title;
+ int err;
+ int i;
+
+ err = register_lines(&driver, &console_ops, vts,
+ ARRAY_SIZE(vts));
+ if (err)
+ return err;
+
+ printk(KERN_INFO "Initialized stdio console driver\n");
+
+ new_title = add_xterm_umid(opts.xterm_title);
+ if(new_title != NULL)
+ opts.xterm_title = new_title;
+
+ for (i = 0; i < MAX_TTYS; i++) {
+ char *error;
+ char *s = vt_conf[i];
+ if (!s)
+ s = def_conf;
+ if (!s)
+ s = i ? CONFIG_CON_CHAN : CONFIG_CON_ZERO_CHAN;
+ if (setup_one_line(vts, i, s, &opts, &error))
+ printk(KERN_ERR "setup_one_line failed for "
+ "device %d : %s\n", i, error);
+ }
+
+ con_init_done = 1;
+ register_console(&stdiocons);
+ return 0;
+}
+late_initcall(stdio_init);
+
+static void console_exit(void)
+{
+ if (!con_init_done)
+ return;
+ close_lines(vts, ARRAY_SIZE(vts));
+}
+__uml_exitcall(console_exit);
+
+static int console_chan_setup(char *str)
+{
+ line_setup(vt_conf, MAX_TTYS, &def_conf, str, "console");
+ return 1;
+}
+__setup("con", console_chan_setup);
+__channel_help(console_chan_setup, "con");
diff --git a/arch/um/drivers/stdio_console.h b/arch/um/drivers/stdio_console.h
new file mode 100644
index 0000000..6d8275f
--- /dev/null
+++ b/arch/um/drivers/stdio_console.h
@@ -0,0 +1,11 @@
+/*
+ * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __STDIO_CONSOLE_H
+#define __STDIO_CONSOLE_H
+
+extern void save_console_flags(void);
+#endif
+
diff --git a/arch/um/drivers/tty.c b/arch/um/drivers/tty.c
new file mode 100644
index 0000000..eaa201b
--- /dev/null
+++ b/arch/um/drivers/tty.c
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
+ * Licensed under the GPL
+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <termios.h>
+#include "chan_user.h"
+#include <os.h>
+#include <um_malloc.h>
+
+struct tty_chan {
+ char *dev;
+ int raw;
+ struct termios tt;
+};
+
+static void *tty_chan_init(char *str, int device, const struct chan_opts *opts)
+{
+ struct tty_chan *data;
+
+ if (*str != ':') {
+ printk(UM_KERN_ERR "tty_init : channel type 'tty' must specify "
+ "a device\n");
+ return NULL;
+ }
+ str++;
+
+ data = uml_kmalloc(sizeof(*data), UM_GFP_KERNEL);
+ if (data == NULL)
+ return NULL;
+ *data = ((struct tty_chan) { .dev = str,
+ .raw = opts->raw });
+
+ return data;
+}
+
+static int tty_open(int input, int output, int primary, void *d,
+ char **dev_out)
+{
+ struct tty_chan *data = d;
+ int fd, err, mode = 0;
+
+ if (input && output)
+ mode = O_RDWR;
+ else if (input)
+ mode = O_RDONLY;
+ else if (output)
+ mode = O_WRONLY;
+
+ fd = open(data->dev, mode);
+ if (fd < 0)
+ return -errno;
+
+ if (data->raw) {
+ CATCH_EINTR(err = tcgetattr(fd, &data->tt));
+ if (err)
+ return err;
+
+ err = raw(fd);
+ if (err)
+ return err;
+ }
+
+ *dev_out = data->dev;
+ return fd;
+}
+
+const struct chan_ops tty_ops = {
+ .type = "tty",
+ .init = tty_chan_init,
+ .open = tty_open,
+ .close = generic_close,
+ .read = generic_read,
+ .write = generic_write,
+ .console_write = generic_console_write,
+ .window_size = generic_window_size,
+ .free = generic_free,
+ .winch = 0,
+};
diff --git a/arch/um/drivers/ubd.h b/arch/um/drivers/ubd.h
new file mode 100644
index 0000000..3b48cd2
--- /dev/null
+++ b/arch/um/drivers/ubd.h
@@ -0,0 +1,15 @@
+/*
+ * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
+ * Copyright (C) 2001 RidgeRun, Inc (glonnon@ridgerun.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_UBD_USER_H
+#define __UM_UBD_USER_H
+
+extern int start_io_thread(unsigned long sp, int *fds_out);
+extern int io_thread(void *arg);
+extern int kernel_fd;
+
+#endif
+
diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
new file mode 100644
index 0000000..e8ab93c
--- /dev/null
+++ b/arch/um/drivers/ubd_kern.c
@@ -0,0 +1,1505 @@
+/*
+ * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+/* 2001-09-28...2002-04-17
+ * Partition stuff by James_McMechan@hotmail.com
+ * old style ubd by setting UBD_SHIFT to 0
+ * 2002-09-27...2002-10-18 massive tinkering for 2.5
+ * partitions have changed in 2.5
+ * 2003-01-29 more tinkering for 2.5.59-1
+ * This should now address the sysfs problems and has
+ * the symlink for devfs to allow for booting with
+ * the common /dev/ubd/discX/... names rather than
+ * only /dev/ubdN/discN this version also has lots of
+ * clean ups preparing for ubd-many.
+ * James McMechan
+ */
+
+#define UBD_SHIFT 4
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/ata.h>
+#include <linux/hdreg.h>
+#include <linux/cdrom.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/ctype.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/platform_device.h>
+#include <linux/scatterlist.h>
+#include <asm/tlbflush.h>
+#include <kern_util.h>
+#include "mconsole_kern.h"
+#include <init.h>
+#include <irq_kern.h>
+#include "ubd.h"
+#include <os.h>
+#include "cow.h"
+
+enum ubd_req { UBD_READ, UBD_WRITE, UBD_FLUSH };
+
+struct io_thread_req {
+ struct request *req;
+ enum ubd_req op;
+ int fds[2];
+ unsigned long offsets[2];
+ unsigned long long offset;
+ unsigned long length;
+ char *buffer;
+ int sectorsize;
+ unsigned long sector_mask;
+ unsigned long long cow_offset;
+ unsigned long bitmap_words[2];
+ int error;
+};
+
+static inline int ubd_test_bit(__u64 bit, unsigned char *data)
+{
+ __u64 n;
+ int bits, off;
+
+ bits = sizeof(data[0]) * 8;
+ n = bit / bits;
+ off = bit % bits;
+ return (data[n] & (1 << off)) != 0;
+}
+
+static inline void ubd_set_bit(__u64 bit, unsigned char *data)
+{
+ __u64 n;
+ int bits, off;
+
+ bits = sizeof(data[0]) * 8;
+ n = bit / bits;
+ off = bit % bits;
+ data[n] |= (1 << off);
+}
+/*End stuff from ubd_user.h*/
+
+#define DRIVER_NAME "uml-blkdev"
+
+static DEFINE_MUTEX(ubd_lock);
+static DEFINE_MUTEX(ubd_mutex); /* replaces BKL, might not be needed */
+
+static int ubd_open(struct block_device *bdev, fmode_t mode);
+static void ubd_release(struct gendisk *disk, fmode_t mode);
+static int ubd_ioctl(struct block_device *bdev, fmode_t mode,
+ unsigned int cmd, unsigned long arg);
+static int ubd_getgeo(struct block_device *bdev, struct hd_geometry *geo);
+
+#define MAX_DEV (16)
+
+static const struct block_device_operations ubd_blops = {
+ .owner = THIS_MODULE,
+ .open = ubd_open,
+ .release = ubd_release,
+ .ioctl = ubd_ioctl,
+ .getgeo = ubd_getgeo,
+};
+
+/* Protected by ubd_lock */
+static int fake_major = UBD_MAJOR;
+static struct gendisk *ubd_gendisk[MAX_DEV];
+static struct gendisk *fake_gendisk[MAX_DEV];
+
+#ifdef CONFIG_BLK_DEV_UBD_SYNC
+#define OPEN_FLAGS ((struct openflags) { .r = 1, .w = 1, .s = 1, .c = 0, \
+ .cl = 1 })
+#else
+#define OPEN_FLAGS ((struct openflags) { .r = 1, .w = 1, .s = 0, .c = 0, \
+ .cl = 1 })
+#endif
+static struct openflags global_openflags = OPEN_FLAGS;
+
+struct cow {
+ /* backing file name */
+ char *file;
+ /* backing file fd */
+ int fd;
+ unsigned long *bitmap;
+ unsigned long bitmap_len;
+ int bitmap_offset;
+ int data_offset;
+};
+
+#define MAX_SG 64
+
+struct ubd {
+ struct list_head restart;
+ /* name (and fd, below) of the file opened for writing, either the
+ * backing or the cow file. */
+ char *file;
+ int count;
+ int fd;
+ __u64 size;
+ struct openflags boot_openflags;
+ struct openflags openflags;
+ unsigned shared:1;
+ unsigned no_cow:1;
+ struct cow cow;
+ struct platform_device pdev;
+ struct request_queue *queue;
+ spinlock_t lock;
+ struct scatterlist sg[MAX_SG];
+ struct request *request;
+ int start_sg, end_sg;
+ sector_t rq_pos;
+};
+
+#define DEFAULT_COW { \
+ .file = NULL, \
+ .fd = -1, \
+ .bitmap = NULL, \
+ .bitmap_offset = 0, \
+ .data_offset = 0, \
+}
+
+#define DEFAULT_UBD { \
+ .file = NULL, \
+ .count = 0, \
+ .fd = -1, \
+ .size = -1, \
+ .boot_openflags = OPEN_FLAGS, \
+ .openflags = OPEN_FLAGS, \
+ .no_cow = 0, \
+ .shared = 0, \
+ .cow = DEFAULT_COW, \
+ .lock = __SPIN_LOCK_UNLOCKED(ubd_devs.lock), \
+ .request = NULL, \
+ .start_sg = 0, \
+ .end_sg = 0, \
+ .rq_pos = 0, \
+}
+
+/* Protected by ubd_lock */
+static struct ubd ubd_devs[MAX_DEV] = { [0 ... MAX_DEV - 1] = DEFAULT_UBD };
+
+/* Only changed by fake_ide_setup which is a setup */
+static int fake_ide = 0;
+static struct proc_dir_entry *proc_ide_root = NULL;
+static struct proc_dir_entry *proc_ide = NULL;
+
+static void make_proc_ide(void)
+{
+ proc_ide_root = proc_mkdir("ide", NULL);
+ proc_ide = proc_mkdir("ide0", proc_ide_root);
+}
+
+static int fake_ide_media_proc_show(struct seq_file *m, void *v)
+{
+ seq_puts(m, "disk\n");
+ return 0;
+}
+
+static int fake_ide_media_proc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, fake_ide_media_proc_show, NULL);
+}
+
+static const struct file_operations fake_ide_media_proc_fops = {
+ .owner = THIS_MODULE,
+ .open = fake_ide_media_proc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static void make_ide_entries(const char *dev_name)
+{
+ struct proc_dir_entry *dir, *ent;
+ char name[64];
+
+ if(proc_ide_root == NULL) make_proc_ide();
+
+ dir = proc_mkdir(dev_name, proc_ide);
+ if(!dir) return;
+
+ ent = proc_create("media", S_IRUGO, dir, &fake_ide_media_proc_fops);
+ if(!ent) return;
+ snprintf(name, sizeof(name), "ide0/%s", dev_name);
+ proc_symlink(dev_name, proc_ide_root, name);
+}
+
+static int fake_ide_setup(char *str)
+{
+ fake_ide = 1;
+ return 1;
+}
+
+__setup("fake_ide", fake_ide_setup);
+
+__uml_help(fake_ide_setup,
+"fake_ide\n"
+" Create ide0 entries that map onto ubd devices.\n\n"
+);
+
+static int parse_unit(char **ptr)
+{
+ char *str = *ptr, *end;
+ int n = -1;
+
+ if(isdigit(*str)) {
+ n = simple_strtoul(str, &end, 0);
+ if(end == str)
+ return -1;
+ *ptr = end;
+ }
+ else if (('a' <= *str) && (*str <= 'z')) {
+ n = *str - 'a';
+ str++;
+ *ptr = str;
+ }
+ return n;
+}
+
+/* If *index_out == -1 at exit, the passed option was a general one;
+ * otherwise, the str pointer is used (and owned) inside ubd_devs array, so it
+ * should not be freed on exit.
+ */
+static int ubd_setup_common(char *str, int *index_out, char **error_out)
+{
+ struct ubd *ubd_dev;
+ struct openflags flags = global_openflags;
+ char *backing_file;
+ int n, err = 0, i;
+
+ if(index_out) *index_out = -1;
+ n = *str;
+ if(n == '='){
+ char *end;
+ int major;
+
+ str++;
+ if(!strcmp(str, "sync")){
+ global_openflags = of_sync(global_openflags);
+ goto out1;
+ }
+
+ err = -EINVAL;
+ major = simple_strtoul(str, &end, 0);
+ if((*end != '\0') || (end == str)){
+ *error_out = "Didn't parse major number";
+ goto out1;
+ }
+
+ mutex_lock(&ubd_lock);
+ if (fake_major != UBD_MAJOR) {
+ *error_out = "Can't assign a fake major twice";
+ goto out1;
+ }
+
+ fake_major = major;
+
+ printk(KERN_INFO "Setting extra ubd major number to %d\n",
+ major);
+ err = 0;
+ out1:
+ mutex_unlock(&ubd_lock);
+ return err;
+ }
+
+ n = parse_unit(&str);
+ if(n < 0){
+ *error_out = "Couldn't parse device number";
+ return -EINVAL;
+ }
+ if(n >= MAX_DEV){
+ *error_out = "Device number out of range";
+ return 1;
+ }
+
+ err = -EBUSY;
+ mutex_lock(&ubd_lock);
+
+ ubd_dev = &ubd_devs[n];
+ if(ubd_dev->file != NULL){
+ *error_out = "Device is already configured";
+ goto out;
+ }
+
+ if (index_out)
+ *index_out = n;
+
+ err = -EINVAL;
+ for (i = 0; i < sizeof("rscd="); i++) {
+ switch (*str) {
+ case 'r':
+ flags.w = 0;
+ break;
+ case 's':
+ flags.s = 1;
+ break;
+ case 'd':
+ ubd_dev->no_cow = 1;
+ break;
+ case 'c':
+ ubd_dev->shared = 1;
+ break;
+ case '=':
+ str++;
+ goto break_loop;
+ default:
+ *error_out = "Expected '=' or flag letter "
+ "(r, s, c, or d)";
+ goto out;
+ }
+ str++;
+ }
+
+ if (*str == '=')
+ *error_out = "Too many flags specified";
+ else
+ *error_out = "Missing '='";
+ goto out;
+
+break_loop:
+ backing_file = strchr(str, ',');
+
+ if (backing_file == NULL)
+ backing_file = strchr(str, ':');
+
+ if(backing_file != NULL){
+ if(ubd_dev->no_cow){
+ *error_out = "Can't specify both 'd' and a cow file";
+ goto out;
+ }
+ else {
+ *backing_file = '\0';
+ backing_file++;
+ }
+ }
+ err = 0;
+ ubd_dev->file = str;
+ ubd_dev->cow.file = backing_file;
+ ubd_dev->boot_openflags = flags;
+out:
+ mutex_unlock(&ubd_lock);
+ return err;
+}
+
+static int ubd_setup(char *str)
+{
+ char *error;
+ int err;
+
+ err = ubd_setup_common(str, NULL, &error);
+ if(err)
+ printk(KERN_ERR "Failed to initialize device with \"%s\" : "
+ "%s\n", str, error);
+ return 1;
+}
+
+__setup("ubd", ubd_setup);
+__uml_help(ubd_setup,
+"ubd<n><flags>=<filename>[(:|,)<filename2>]\n"
+" This is used to associate a device with a file in the underlying\n"
+" filesystem. When specifying two filenames, the first one is the\n"
+" COW name and the second is the backing file name. As separator you can\n"
+" use either a ':' or a ',': the first one allows writing things like;\n"
+" ubd0=~/Uml/root_cow:~/Uml/root_backing_file\n"
+" while with a ',' the shell would not expand the 2nd '~'.\n"
+" When using only one filename, UML will detect whether to treat it like\n"
+" a COW file or a backing file. To override this detection, add the 'd'\n"
+" flag:\n"
+" ubd0d=BackingFile\n"
+" Usually, there is a filesystem in the file, but \n"
+" that's not required. Swap devices containing swap files can be\n"
+" specified like this. Also, a file which doesn't contain a\n"
+" filesystem can have its contents read in the virtual \n"
+" machine by running 'dd' on the device. <n> must be in the range\n"
+" 0 to 7. Appending an 'r' to the number will cause that device\n"
+" to be mounted read-only. For example ubd1r=./ext_fs. Appending\n"
+" an 's' will cause data to be written to disk on the host immediately.\n"
+" 'c' will cause the device to be treated as being shared between multiple\n"
+" UMLs and file locking will be turned off - this is appropriate for a\n"
+" cluster filesystem and inappropriate at almost all other times.\n\n"
+);
+
+static int udb_setup(char *str)
+{
+ printk("udb%s specified on command line is almost certainly a ubd -> "
+ "udb TYPO\n", str);
+ return 1;
+}
+
+__setup("udb", udb_setup);
+__uml_help(udb_setup,
+"udb\n"
+" This option is here solely to catch ubd -> udb typos, which can be\n"
+" to impossible to catch visually unless you specifically look for\n"
+" them. The only result of any option starting with 'udb' is an error\n"
+" in the boot output.\n\n"
+);
+
+static void do_ubd_request(struct request_queue * q);
+
+/* Only changed by ubd_init, which is an initcall. */
+static int thread_fd = -1;
+static LIST_HEAD(restart);
+
+/* XXX - move this inside ubd_intr. */
+/* Called without dev->lock held, and only in interrupt context. */
+static void ubd_handler(void)
+{
+ struct io_thread_req *req;
+ struct ubd *ubd;
+ struct list_head *list, *next_ele;
+ unsigned long flags;
+ int n;
+
+ while(1){
+ n = os_read_file(thread_fd, &req,
+ sizeof(struct io_thread_req *));
+ if(n != sizeof(req)){
+ if(n == -EAGAIN)
+ break;
+ printk(KERN_ERR "spurious interrupt in ubd_handler, "
+ "err = %d\n", -n);
+ return;
+ }
+
+ blk_end_request(req->req, 0, req->length);
+ kfree(req);
+ }
+ reactivate_fd(thread_fd, UBD_IRQ);
+
+ list_for_each_safe(list, next_ele, &restart){
+ ubd = container_of(list, struct ubd, restart);
+ list_del_init(&ubd->restart);
+ spin_lock_irqsave(&ubd->lock, flags);
+ do_ubd_request(ubd->queue);
+ spin_unlock_irqrestore(&ubd->lock, flags);
+ }
+}
+
+static irqreturn_t ubd_intr(int irq, void *dev)
+{
+ ubd_handler();
+ return IRQ_HANDLED;
+}
+
+/* Only changed by ubd_init, which is an initcall. */
+static int io_pid = -1;
+
+static void kill_io_thread(void)
+{
+ if(io_pid != -1)
+ os_kill_process(io_pid, 1);
+}
+
+__uml_exitcall(kill_io_thread);
+
+static inline int ubd_file_size(struct ubd *ubd_dev, __u64 *size_out)
+{
+ char *file;
+ int fd;
+ int err;
+
+ __u32 version;
+ __u32 align;
+ char *backing_file;
+ time_t mtime;
+ unsigned long long size;
+ int sector_size;
+ int bitmap_offset;
+
+ if (ubd_dev->file && ubd_dev->cow.file) {
+ file = ubd_dev->cow.file;
+
+ goto out;
+ }
+
+ fd = os_open_file(ubd_dev->file, of_read(OPENFLAGS()), 0);
+ if (fd < 0)
+ return fd;
+
+ err = read_cow_header(file_reader, &fd, &version, &backing_file, \
+ &mtime, &size, §or_size, &align, &bitmap_offset);
+ os_close_file(fd);
+
+ if(err == -EINVAL)
+ file = ubd_dev->file;
+ else
+ file = backing_file;
+
+out:
+ return os_file_size(file, size_out);
+}
+
+static int read_cow_bitmap(int fd, void *buf, int offset, int len)
+{
+ int err;
+
+ err = os_seek_file(fd, offset);
+ if (err < 0)
+ return err;
+
+ err = os_read_file(fd, buf, len);
+ if (err < 0)
+ return err;
+
+ return 0;
+}
+
+static int backing_file_mismatch(char *file, __u64 size, time_t mtime)
+{
+ unsigned long modtime;
+ unsigned long long actual;
+ int err;
+
+ err = os_file_modtime(file, &modtime);
+ if (err < 0) {
+ printk(KERN_ERR "Failed to get modification time of backing "
+ "file \"%s\", err = %d\n", file, -err);
+ return err;
+ }
+
+ err = os_file_size(file, &actual);
+ if (err < 0) {
+ printk(KERN_ERR "Failed to get size of backing file \"%s\", "
+ "err = %d\n", file, -err);
+ return err;
+ }
+
+ if (actual != size) {
+ /*__u64 can be a long on AMD64 and with %lu GCC complains; so
+ * the typecast.*/
+ printk(KERN_ERR "Size mismatch (%llu vs %llu) of COW header "
+ "vs backing file\n", (unsigned long long) size, actual);
+ return -EINVAL;
+ }
+ if (modtime != mtime) {
+ printk(KERN_ERR "mtime mismatch (%ld vs %ld) of COW header vs "
+ "backing file\n", mtime, modtime);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int path_requires_switch(char *from_cmdline, char *from_cow, char *cow)
+{
+ struct uml_stat buf1, buf2;
+ int err;
+
+ if (from_cmdline == NULL)
+ return 0;
+ if (!strcmp(from_cmdline, from_cow))
+ return 0;
+
+ err = os_stat_file(from_cmdline, &buf1);
+ if (err < 0) {
+ printk(KERN_ERR "Couldn't stat '%s', err = %d\n", from_cmdline,
+ -err);
+ return 0;
+ }
+ err = os_stat_file(from_cow, &buf2);
+ if (err < 0) {
+ printk(KERN_ERR "Couldn't stat '%s', err = %d\n", from_cow,
+ -err);
+ return 1;
+ }
+ if ((buf1.ust_dev == buf2.ust_dev) && (buf1.ust_ino == buf2.ust_ino))
+ return 0;
+
+ printk(KERN_ERR "Backing file mismatch - \"%s\" requested, "
+ "\"%s\" specified in COW header of \"%s\"\n",
+ from_cmdline, from_cow, cow);
+ return 1;
+}
+
+static int open_ubd_file(char *file, struct openflags *openflags, int shared,
+ char **backing_file_out, int *bitmap_offset_out,
+ unsigned long *bitmap_len_out, int *data_offset_out,
+ int *create_cow_out)
+{
+ time_t mtime;
+ unsigned long long size;
+ __u32 version, align;
+ char *backing_file;
+ int fd, err, sectorsize, asked_switch, mode = 0644;
+
+ fd = os_open_file(file, *openflags, mode);
+ if (fd < 0) {
+ if ((fd == -ENOENT) && (create_cow_out != NULL))
+ *create_cow_out = 1;
+ if (!openflags->w ||
+ ((fd != -EROFS) && (fd != -EACCES)))
+ return fd;
+ openflags->w = 0;
+ fd = os_open_file(file, *openflags, mode);
+ if (fd < 0)
+ return fd;
+ }
+
+ if (shared)
+ printk(KERN_INFO "Not locking \"%s\" on the host\n", file);
+ else {
+ err = os_lock_file(fd, openflags->w);
+ if (err < 0) {
+ printk(KERN_ERR "Failed to lock '%s', err = %d\n",
+ file, -err);
+ goto out_close;
+ }
+ }
+
+ /* Successful return case! */
+ if (backing_file_out == NULL)
+ return fd;
+
+ err = read_cow_header(file_reader, &fd, &version, &backing_file, &mtime,
+ &size, §orsize, &align, bitmap_offset_out);
+ if (err && (*backing_file_out != NULL)) {
+ printk(KERN_ERR "Failed to read COW header from COW file "
+ "\"%s\", errno = %d\n", file, -err);
+ goto out_close;
+ }
+ if (err)
+ return fd;
+
+ asked_switch = path_requires_switch(*backing_file_out, backing_file,
+ file);
+
+ /* Allow switching only if no mismatch. */
+ if (asked_switch && !backing_file_mismatch(*backing_file_out, size,
+ mtime)) {
+ printk(KERN_ERR "Switching backing file to '%s'\n",
+ *backing_file_out);
+ err = write_cow_header(file, fd, *backing_file_out,
+ sectorsize, align, &size);
+ if (err) {
+ printk(KERN_ERR "Switch failed, errno = %d\n", -err);
+ goto out_close;
+ }
+ } else {
+ *backing_file_out = backing_file;
+ err = backing_file_mismatch(*backing_file_out, size, mtime);
+ if (err)
+ goto out_close;
+ }
+
+ cow_sizes(version, size, sectorsize, align, *bitmap_offset_out,
+ bitmap_len_out, data_offset_out);
+
+ return fd;
+ out_close:
+ os_close_file(fd);
+ return err;
+}
+
+static int create_cow_file(char *cow_file, char *backing_file,
+ struct openflags flags,
+ int sectorsize, int alignment, int *bitmap_offset_out,
+ unsigned long *bitmap_len_out, int *data_offset_out)
+{
+ int err, fd;
+
+ flags.c = 1;
+ fd = open_ubd_file(cow_file, &flags, 0, NULL, NULL, NULL, NULL, NULL);
+ if (fd < 0) {
+ err = fd;
+ printk(KERN_ERR "Open of COW file '%s' failed, errno = %d\n",
+ cow_file, -err);
+ goto out;
+ }
+
+ err = init_cow_file(fd, cow_file, backing_file, sectorsize, alignment,
+ bitmap_offset_out, bitmap_len_out,
+ data_offset_out);
+ if (!err)
+ return fd;
+ os_close_file(fd);
+ out:
+ return err;
+}
+
+static void ubd_close_dev(struct ubd *ubd_dev)
+{
+ os_close_file(ubd_dev->fd);
+ if(ubd_dev->cow.file == NULL)
+ return;
+
+ os_close_file(ubd_dev->cow.fd);
+ vfree(ubd_dev->cow.bitmap);
+ ubd_dev->cow.bitmap = NULL;
+}
+
+static int ubd_open_dev(struct ubd *ubd_dev)
+{
+ struct openflags flags;
+ char **back_ptr;
+ int err, create_cow, *create_ptr;
+ int fd;
+
+ ubd_dev->openflags = ubd_dev->boot_openflags;
+ create_cow = 0;
+ create_ptr = (ubd_dev->cow.file != NULL) ? &create_cow : NULL;
+ back_ptr = ubd_dev->no_cow ? NULL : &ubd_dev->cow.file;
+
+ fd = open_ubd_file(ubd_dev->file, &ubd_dev->openflags, ubd_dev->shared,
+ back_ptr, &ubd_dev->cow.bitmap_offset,
+ &ubd_dev->cow.bitmap_len, &ubd_dev->cow.data_offset,
+ create_ptr);
+
+ if((fd == -ENOENT) && create_cow){
+ fd = create_cow_file(ubd_dev->file, ubd_dev->cow.file,
+ ubd_dev->openflags, 1 << 9, PAGE_SIZE,
+ &ubd_dev->cow.bitmap_offset,
+ &ubd_dev->cow.bitmap_len,
+ &ubd_dev->cow.data_offset);
+ if(fd >= 0){
+ printk(KERN_INFO "Creating \"%s\" as COW file for "
+ "\"%s\"\n", ubd_dev->file, ubd_dev->cow.file);
+ }
+ }
+
+ if(fd < 0){
+ printk("Failed to open '%s', errno = %d\n", ubd_dev->file,
+ -fd);
+ return fd;
+ }
+ ubd_dev->fd = fd;
+
+ if(ubd_dev->cow.file != NULL){
+ blk_queue_max_hw_sectors(ubd_dev->queue, 8 * sizeof(long));
+
+ err = -ENOMEM;
+ ubd_dev->cow.bitmap = vmalloc(ubd_dev->cow.bitmap_len);
+ if(ubd_dev->cow.bitmap == NULL){
+ printk(KERN_ERR "Failed to vmalloc COW bitmap\n");
+ goto error;
+ }
+ flush_tlb_kernel_vm();
+
+ err = read_cow_bitmap(ubd_dev->fd, ubd_dev->cow.bitmap,
+ ubd_dev->cow.bitmap_offset,
+ ubd_dev->cow.bitmap_len);
+ if(err < 0)
+ goto error;
+
+ flags = ubd_dev->openflags;
+ flags.w = 0;
+ err = open_ubd_file(ubd_dev->cow.file, &flags, ubd_dev->shared, NULL,
+ NULL, NULL, NULL, NULL);
+ if(err < 0) goto error;
+ ubd_dev->cow.fd = err;
+ }
+ return 0;
+ error:
+ os_close_file(ubd_dev->fd);
+ return err;
+}
+
+static void ubd_device_release(struct device *dev)
+{
+ struct ubd *ubd_dev = dev_get_drvdata(dev);
+
+ blk_cleanup_queue(ubd_dev->queue);
+ *ubd_dev = ((struct ubd) DEFAULT_UBD);
+}
+
+static int ubd_disk_register(int major, u64 size, int unit,
+ struct gendisk **disk_out)
+{
+ struct gendisk *disk;
+
+ disk = alloc_disk(1 << UBD_SHIFT);
+ if(disk == NULL)
+ return -ENOMEM;
+
+ disk->major = major;
+ disk->first_minor = unit << UBD_SHIFT;
+ disk->fops = &ubd_blops;
+ set_capacity(disk, size / 512);
+ if (major == UBD_MAJOR)
+ sprintf(disk->disk_name, "ubd%c", 'a' + unit);
+ else
+ sprintf(disk->disk_name, "ubd_fake%d", unit);
+
+ /* sysfs register (not for ide fake devices) */
+ if (major == UBD_MAJOR) {
+ ubd_devs[unit].pdev.id = unit;
+ ubd_devs[unit].pdev.name = DRIVER_NAME;
+ ubd_devs[unit].pdev.dev.release = ubd_device_release;
+ dev_set_drvdata(&ubd_devs[unit].pdev.dev, &ubd_devs[unit]);
+ platform_device_register(&ubd_devs[unit].pdev);
+ disk->driverfs_dev = &ubd_devs[unit].pdev.dev;
+ }
+
+ disk->private_data = &ubd_devs[unit];
+ disk->queue = ubd_devs[unit].queue;
+ add_disk(disk);
+
+ *disk_out = disk;
+ return 0;
+}
+
+#define ROUND_BLOCK(n) ((n + ((1 << 9) - 1)) & (-1 << 9))
+
+static int ubd_add(int n, char **error_out)
+{
+ struct ubd *ubd_dev = &ubd_devs[n];
+ int err = 0;
+
+ if(ubd_dev->file == NULL)
+ goto out;
+
+ err = ubd_file_size(ubd_dev, &ubd_dev->size);
+ if(err < 0){
+ *error_out = "Couldn't determine size of device's file";
+ goto out;
+ }
+
+ ubd_dev->size = ROUND_BLOCK(ubd_dev->size);
+
+ INIT_LIST_HEAD(&ubd_dev->restart);
+ sg_init_table(ubd_dev->sg, MAX_SG);
+
+ err = -ENOMEM;
+ ubd_dev->queue = blk_init_queue(do_ubd_request, &ubd_dev->lock);
+ if (ubd_dev->queue == NULL) {
+ *error_out = "Failed to initialize device queue";
+ goto out;
+ }
+ ubd_dev->queue->queuedata = ubd_dev;
+ blk_queue_flush(ubd_dev->queue, REQ_FLUSH);
+
+ blk_queue_max_segments(ubd_dev->queue, MAX_SG);
+ err = ubd_disk_register(UBD_MAJOR, ubd_dev->size, n, &ubd_gendisk[n]);
+ if(err){
+ *error_out = "Failed to register device";
+ goto out_cleanup;
+ }
+
+ if (fake_major != UBD_MAJOR)
+ ubd_disk_register(fake_major, ubd_dev->size, n,
+ &fake_gendisk[n]);
+
+ /*
+ * Perhaps this should also be under the "if (fake_major)" above
+ * using the fake_disk->disk_name
+ */
+ if (fake_ide)
+ make_ide_entries(ubd_gendisk[n]->disk_name);
+
+ err = 0;
+out:
+ return err;
+
+out_cleanup:
+ blk_cleanup_queue(ubd_dev->queue);
+ goto out;
+}
+
+static int ubd_config(char *str, char **error_out)
+{
+ int n, ret;
+
+ /* This string is possibly broken up and stored, so it's only
+ * freed if ubd_setup_common fails, or if only general options
+ * were set.
+ */
+ str = kstrdup(str, GFP_KERNEL);
+ if (str == NULL) {
+ *error_out = "Failed to allocate memory";
+ return -ENOMEM;
+ }
+
+ ret = ubd_setup_common(str, &n, error_out);
+ if (ret)
+ goto err_free;
+
+ if (n == -1) {
+ ret = 0;
+ goto err_free;
+ }
+
+ mutex_lock(&ubd_lock);
+ ret = ubd_add(n, error_out);
+ if (ret)
+ ubd_devs[n].file = NULL;
+ mutex_unlock(&ubd_lock);
+
+out:
+ return ret;
+
+err_free:
+ kfree(str);
+ goto out;
+}
+
+static int ubd_get_config(char *name, char *str, int size, char **error_out)
+{
+ struct ubd *ubd_dev;
+ int n, len = 0;
+
+ n = parse_unit(&name);
+ if((n >= MAX_DEV) || (n < 0)){
+ *error_out = "ubd_get_config : device number out of range";
+ return -1;
+ }
+
+ ubd_dev = &ubd_devs[n];
+ mutex_lock(&ubd_lock);
+
+ if(ubd_dev->file == NULL){
+ CONFIG_CHUNK(str, size, len, "", 1);
+ goto out;
+ }
+
+ CONFIG_CHUNK(str, size, len, ubd_dev->file, 0);
+
+ if(ubd_dev->cow.file != NULL){
+ CONFIG_CHUNK(str, size, len, ",", 0);
+ CONFIG_CHUNK(str, size, len, ubd_dev->cow.file, 1);
+ }
+ else CONFIG_CHUNK(str, size, len, "", 1);
+
+ out:
+ mutex_unlock(&ubd_lock);
+ return len;
+}
+
+static int ubd_id(char **str, int *start_out, int *end_out)
+{
+ int n;
+
+ n = parse_unit(str);
+ *start_out = 0;
+ *end_out = MAX_DEV - 1;
+ return n;
+}
+
+static int ubd_remove(int n, char **error_out)
+{
+ struct gendisk *disk = ubd_gendisk[n];
+ struct ubd *ubd_dev;
+ int err = -ENODEV;
+
+ mutex_lock(&ubd_lock);
+
+ ubd_dev = &ubd_devs[n];
+
+ if(ubd_dev->file == NULL)
+ goto out;
+
+ /* you cannot remove a open disk */
+ err = -EBUSY;
+ if(ubd_dev->count > 0)
+ goto out;
+
+ ubd_gendisk[n] = NULL;
+ if(disk != NULL){
+ del_gendisk(disk);
+ put_disk(disk);
+ }
+
+ if(fake_gendisk[n] != NULL){
+ del_gendisk(fake_gendisk[n]);
+ put_disk(fake_gendisk[n]);
+ fake_gendisk[n] = NULL;
+ }
+
+ err = 0;
+ platform_device_unregister(&ubd_dev->pdev);
+out:
+ mutex_unlock(&ubd_lock);
+ return err;
+}
+
+/* All these are called by mconsole in process context and without
+ * ubd-specific locks. The structure itself is const except for .list.
+ */
+static struct mc_device ubd_mc = {
+ .list = LIST_HEAD_INIT(ubd_mc.list),
+ .name = "ubd",
+ .config = ubd_config,
+ .get_config = ubd_get_config,
+ .id = ubd_id,
+ .remove = ubd_remove,
+};
+
+static int __init ubd_mc_init(void)
+{
+ mconsole_register_dev(&ubd_mc);
+ return 0;
+}
+
+__initcall(ubd_mc_init);
+
+static int __init ubd0_init(void)
+{
+ struct ubd *ubd_dev = &ubd_devs[0];
+
+ mutex_lock(&ubd_lock);
+ if(ubd_dev->file == NULL)
+ ubd_dev->file = "root_fs";
+ mutex_unlock(&ubd_lock);
+
+ return 0;
+}
+
+__initcall(ubd0_init);
+
+/* Used in ubd_init, which is an initcall */
+static struct platform_driver ubd_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ },
+};
+
+static int __init ubd_init(void)
+{
+ char *error;
+ int i, err;
+
+ if (register_blkdev(UBD_MAJOR, "ubd"))
+ return -1;
+
+ if (fake_major != UBD_MAJOR) {
+ char name[sizeof("ubd_nnn\0")];
+
+ snprintf(name, sizeof(name), "ubd_%d", fake_major);
+ if (register_blkdev(fake_major, "ubd"))
+ return -1;
+ }
+ platform_driver_register(&ubd_driver);
+ mutex_lock(&ubd_lock);
+ for (i = 0; i < MAX_DEV; i++){
+ err = ubd_add(i, &error);
+ if(err)
+ printk(KERN_ERR "Failed to initialize ubd device %d :"
+ "%s\n", i, error);
+ }
+ mutex_unlock(&ubd_lock);
+ return 0;
+}
+
+late_initcall(ubd_init);
+
+static int __init ubd_driver_init(void){
+ unsigned long stack;
+ int err;
+
+ /* Set by CONFIG_BLK_DEV_UBD_SYNC or ubd=sync.*/
+ if(global_openflags.s){
+ printk(KERN_INFO "ubd: Synchronous mode\n");
+ /* Letting ubd=sync be like using ubd#s= instead of ubd#= is
+ * enough. So use anyway the io thread. */
+ }
+ stack = alloc_stack(0, 0);
+ io_pid = start_io_thread(stack + PAGE_SIZE - sizeof(void *),
+ &thread_fd);
+ if(io_pid < 0){
+ printk(KERN_ERR
+ "ubd : Failed to start I/O thread (errno = %d) - "
+ "falling back to synchronous I/O\n", -io_pid);
+ io_pid = -1;
+ return 0;
+ }
+ err = um_request_irq(UBD_IRQ, thread_fd, IRQ_READ, ubd_intr,
+ 0, "ubd", ubd_devs);
+ if(err != 0)
+ printk(KERN_ERR "um_request_irq failed - errno = %d\n", -err);
+ return 0;
+}
+
+device_initcall(ubd_driver_init);
+
+static int ubd_open(struct block_device *bdev, fmode_t mode)
+{
+ struct gendisk *disk = bdev->bd_disk;
+ struct ubd *ubd_dev = disk->private_data;
+ int err = 0;
+
+ mutex_lock(&ubd_mutex);
+ if(ubd_dev->count == 0){
+ err = ubd_open_dev(ubd_dev);
+ if(err){
+ printk(KERN_ERR "%s: Can't open \"%s\": errno = %d\n",
+ disk->disk_name, ubd_dev->file, -err);
+ goto out;
+ }
+ }
+ ubd_dev->count++;
+ set_disk_ro(disk, !ubd_dev->openflags.w);
+
+ /* This should no more be needed. And it didn't work anyway to exclude
+ * read-write remounting of filesystems.*/
+ /*if((mode & FMODE_WRITE) && !ubd_dev->openflags.w){
+ if(--ubd_dev->count == 0) ubd_close_dev(ubd_dev);
+ err = -EROFS;
+ }*/
+out:
+ mutex_unlock(&ubd_mutex);
+ return err;
+}
+
+static void ubd_release(struct gendisk *disk, fmode_t mode)
+{
+ struct ubd *ubd_dev = disk->private_data;
+
+ mutex_lock(&ubd_mutex);
+ if(--ubd_dev->count == 0)
+ ubd_close_dev(ubd_dev);
+ mutex_unlock(&ubd_mutex);
+}
+
+static void cowify_bitmap(__u64 io_offset, int length, unsigned long *cow_mask,
+ __u64 *cow_offset, unsigned long *bitmap,
+ __u64 bitmap_offset, unsigned long *bitmap_words,
+ __u64 bitmap_len)
+{
+ __u64 sector = io_offset >> 9;
+ int i, update_bitmap = 0;
+
+ for(i = 0; i < length >> 9; i++){
+ if(cow_mask != NULL)
+ ubd_set_bit(i, (unsigned char *) cow_mask);
+ if(ubd_test_bit(sector + i, (unsigned char *) bitmap))
+ continue;
+
+ update_bitmap = 1;
+ ubd_set_bit(sector + i, (unsigned char *) bitmap);
+ }
+
+ if(!update_bitmap)
+ return;
+
+ *cow_offset = sector / (sizeof(unsigned long) * 8);
+
+ /* This takes care of the case where we're exactly at the end of the
+ * device, and *cow_offset + 1 is off the end. So, just back it up
+ * by one word. Thanks to Lynn Kerby for the fix and James McMechan
+ * for the original diagnosis.
+ */
+ if (*cow_offset == (DIV_ROUND_UP(bitmap_len,
+ sizeof(unsigned long)) - 1))
+ (*cow_offset)--;
+
+ bitmap_words[0] = bitmap[*cow_offset];
+ bitmap_words[1] = bitmap[*cow_offset + 1];
+
+ *cow_offset *= sizeof(unsigned long);
+ *cow_offset += bitmap_offset;
+}
+
+static void cowify_req(struct io_thread_req *req, unsigned long *bitmap,
+ __u64 bitmap_offset, __u64 bitmap_len)
+{
+ __u64 sector = req->offset >> 9;
+ int i;
+
+ if(req->length > (sizeof(req->sector_mask) * 8) << 9)
+ panic("Operation too long");
+
+ if(req->op == UBD_READ) {
+ for(i = 0; i < req->length >> 9; i++){
+ if(ubd_test_bit(sector + i, (unsigned char *) bitmap))
+ ubd_set_bit(i, (unsigned char *)
+ &req->sector_mask);
+ }
+ }
+ else cowify_bitmap(req->offset, req->length, &req->sector_mask,
+ &req->cow_offset, bitmap, bitmap_offset,
+ req->bitmap_words, bitmap_len);
+}
+
+/* Called with dev->lock held */
+static void prepare_request(struct request *req, struct io_thread_req *io_req,
+ unsigned long long offset, int page_offset,
+ int len, struct page *page)
+{
+ struct gendisk *disk = req->rq_disk;
+ struct ubd *ubd_dev = disk->private_data;
+
+ io_req->req = req;
+ io_req->fds[0] = (ubd_dev->cow.file != NULL) ? ubd_dev->cow.fd :
+ ubd_dev->fd;
+ io_req->fds[1] = ubd_dev->fd;
+ io_req->cow_offset = -1;
+ io_req->offset = offset;
+ io_req->length = len;
+ io_req->error = 0;
+ io_req->sector_mask = 0;
+
+ io_req->op = (rq_data_dir(req) == READ) ? UBD_READ : UBD_WRITE;
+ io_req->offsets[0] = 0;
+ io_req->offsets[1] = ubd_dev->cow.data_offset;
+ io_req->buffer = page_address(page) + page_offset;
+ io_req->sectorsize = 1 << 9;
+
+ if(ubd_dev->cow.file != NULL)
+ cowify_req(io_req, ubd_dev->cow.bitmap,
+ ubd_dev->cow.bitmap_offset, ubd_dev->cow.bitmap_len);
+
+}
+
+/* Called with dev->lock held */
+static void prepare_flush_request(struct request *req,
+ struct io_thread_req *io_req)
+{
+ struct gendisk *disk = req->rq_disk;
+ struct ubd *ubd_dev = disk->private_data;
+
+ io_req->req = req;
+ io_req->fds[0] = (ubd_dev->cow.file != NULL) ? ubd_dev->cow.fd :
+ ubd_dev->fd;
+ io_req->op = UBD_FLUSH;
+}
+
+static bool submit_request(struct io_thread_req *io_req, struct ubd *dev)
+{
+ int n = os_write_file(thread_fd, &io_req,
+ sizeof(io_req));
+ if (n != sizeof(io_req)) {
+ if (n != -EAGAIN)
+ printk("write to io thread failed, "
+ "errno = %d\n", -n);
+ else if (list_empty(&dev->restart))
+ list_add(&dev->restart, &restart);
+
+ kfree(io_req);
+ return false;
+ }
+ return true;
+}
+
+/* Called with dev->lock held */
+static void do_ubd_request(struct request_queue *q)
+{
+ struct io_thread_req *io_req;
+ struct request *req;
+
+ while(1){
+ struct ubd *dev = q->queuedata;
+ if(dev->request == NULL){
+ struct request *req = blk_fetch_request(q);
+ if(req == NULL)
+ return;
+
+ dev->request = req;
+ dev->rq_pos = blk_rq_pos(req);
+ dev->start_sg = 0;
+ dev->end_sg = blk_rq_map_sg(q, req, dev->sg);
+ }
+
+ req = dev->request;
+
+ if (req->cmd_flags & REQ_FLUSH) {
+ io_req = kmalloc(sizeof(struct io_thread_req),
+ GFP_ATOMIC);
+ if (io_req == NULL) {
+ if (list_empty(&dev->restart))
+ list_add(&dev->restart, &restart);
+ return;
+ }
+ prepare_flush_request(req, io_req);
+ if (submit_request(io_req, dev) == false)
+ return;
+ }
+
+ while(dev->start_sg < dev->end_sg){
+ struct scatterlist *sg = &dev->sg[dev->start_sg];
+
+ io_req = kmalloc(sizeof(struct io_thread_req),
+ GFP_ATOMIC);
+ if(io_req == NULL){
+ if(list_empty(&dev->restart))
+ list_add(&dev->restart, &restart);
+ return;
+ }
+ prepare_request(req, io_req,
+ (unsigned long long)dev->rq_pos << 9,
+ sg->offset, sg->length, sg_page(sg));
+
+ if (submit_request(io_req, dev) == false)
+ return;
+
+ dev->rq_pos += sg->length >> 9;
+ dev->start_sg++;
+ }
+ dev->end_sg = 0;
+ dev->request = NULL;
+ }
+}
+
+static int ubd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
+{
+ struct ubd *ubd_dev = bdev->bd_disk->private_data;
+
+ geo->heads = 128;
+ geo->sectors = 32;
+ geo->cylinders = ubd_dev->size / (128 * 32 * 512);
+ return 0;
+}
+
+static int ubd_ioctl(struct block_device *bdev, fmode_t mode,
+ unsigned int cmd, unsigned long arg)
+{
+ struct ubd *ubd_dev = bdev->bd_disk->private_data;
+ u16 ubd_id[ATA_ID_WORDS];
+
+ switch (cmd) {
+ struct cdrom_volctrl volume;
+ case HDIO_GET_IDENTITY:
+ memset(&ubd_id, 0, ATA_ID_WORDS * 2);
+ ubd_id[ATA_ID_CYLS] = ubd_dev->size / (128 * 32 * 512);
+ ubd_id[ATA_ID_HEADS] = 128;
+ ubd_id[ATA_ID_SECTORS] = 32;
+ if(copy_to_user((char __user *) arg, (char *) &ubd_id,
+ sizeof(ubd_id)))
+ return -EFAULT;
+ return 0;
+
+ case CDROMVOLREAD:
+ if(copy_from_user(&volume, (char __user *) arg, sizeof(volume)))
+ return -EFAULT;
+ volume.channel0 = 255;
+ volume.channel1 = 255;
+ volume.channel2 = 255;
+ volume.channel3 = 255;
+ if(copy_to_user((char __user *) arg, &volume, sizeof(volume)))
+ return -EFAULT;
+ return 0;
+ }
+ return -EINVAL;
+}
+
+static int update_bitmap(struct io_thread_req *req)
+{
+ int n;
+
+ if(req->cow_offset == -1)
+ return 0;
+
+ n = os_seek_file(req->fds[1], req->cow_offset);
+ if(n < 0){
+ printk("do_io - bitmap lseek failed : err = %d\n", -n);
+ return 1;
+ }
+
+ n = os_write_file(req->fds[1], &req->bitmap_words,
+ sizeof(req->bitmap_words));
+ if(n != sizeof(req->bitmap_words)){
+ printk("do_io - bitmap update failed, err = %d fd = %d\n", -n,
+ req->fds[1]);
+ return 1;
+ }
+
+ return 0;
+}
+
+static void do_io(struct io_thread_req *req)
+{
+ char *buf;
+ unsigned long len;
+ int n, nsectors, start, end, bit;
+ int err;
+ __u64 off;
+
+ if (req->op == UBD_FLUSH) {
+ /* fds[0] is always either the rw image or our cow file */
+ n = os_sync_file(req->fds[0]);
+ if (n != 0) {
+ printk("do_io - sync failed err = %d "
+ "fd = %d\n", -n, req->fds[0]);
+ req->error = 1;
+ }
+ return;
+ }
+
+ nsectors = req->length / req->sectorsize;
+ start = 0;
+ do {
+ bit = ubd_test_bit(start, (unsigned char *) &req->sector_mask);
+ end = start;
+ while((end < nsectors) &&
+ (ubd_test_bit(end, (unsigned char *)
+ &req->sector_mask) == bit))
+ end++;
+
+ off = req->offset + req->offsets[bit] +
+ start * req->sectorsize;
+ len = (end - start) * req->sectorsize;
+ buf = &req->buffer[start * req->sectorsize];
+
+ err = os_seek_file(req->fds[bit], off);
+ if(err < 0){
+ printk("do_io - lseek failed : err = %d\n", -err);
+ req->error = 1;
+ return;
+ }
+ if(req->op == UBD_READ){
+ n = 0;
+ do {
+ buf = &buf[n];
+ len -= n;
+ n = os_read_file(req->fds[bit], buf, len);
+ if (n < 0) {
+ printk("do_io - read failed, err = %d "
+ "fd = %d\n", -n, req->fds[bit]);
+ req->error = 1;
+ return;
+ }
+ } while((n < len) && (n != 0));
+ if (n < len) memset(&buf[n], 0, len - n);
+ } else {
+ n = os_write_file(req->fds[bit], buf, len);
+ if(n != len){
+ printk("do_io - write failed err = %d "
+ "fd = %d\n", -n, req->fds[bit]);
+ req->error = 1;
+ return;
+ }
+ }
+
+ start = end;
+ } while(start < nsectors);
+
+ req->error = update_bitmap(req);
+}
+
+/* Changed in start_io_thread, which is serialized by being called only
+ * from ubd_init, which is an initcall.
+ */
+int kernel_fd = -1;
+
+/* Only changed by the io thread. XXX: currently unused. */
+static int io_count = 0;
+
+int io_thread(void *arg)
+{
+ struct io_thread_req *req;
+ int n;
+
+ os_fix_helper_signals();
+
+ while(1){
+ n = os_read_file(kernel_fd, &req,
+ sizeof(struct io_thread_req *));
+ if(n != sizeof(struct io_thread_req *)){
+ if(n < 0)
+ printk("io_thread - read failed, fd = %d, "
+ "err = %d\n", kernel_fd, -n);
+ else {
+ printk("io_thread - short read, fd = %d, "
+ "length = %d\n", kernel_fd, n);
+ }
+ continue;
+ }
+ io_count++;
+ do_io(req);
+ n = os_write_file(kernel_fd, &req,
+ sizeof(struct io_thread_req *));
+ if(n != sizeof(struct io_thread_req *))
+ printk("io_thread - write failed, fd = %d, err = %d\n",
+ kernel_fd, -n);
+ }
+
+ return 0;
+}
diff --git a/arch/um/drivers/ubd_user.c b/arch/um/drivers/ubd_user.c
new file mode 100644
index 0000000..e376f9b
--- /dev/null
+++ b/arch/um/drivers/ubd_user.c
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Copyright (C) 2001 Ridgerun,Inc (glonnon@ridgerun.com)
+ * Licensed under the GPL
+ */
+
+#include <stddef.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sched.h>
+#include <signal.h>
+#include <string.h>
+#include <netinet/in.h>
+#include <sys/time.h>
+#include <sys/socket.h>
+#include <sys/mman.h>
+#include <sys/param.h>
+#include <endian.h>
+#include <byteswap.h>
+
+#include "ubd.h"
+#include <os.h>
+
+int start_io_thread(unsigned long sp, int *fd_out)
+{
+ int pid, fds[2], err;
+
+ err = os_pipe(fds, 1, 1);
+ if(err < 0){
+ printk("start_io_thread - os_pipe failed, err = %d\n", -err);
+ goto out;
+ }
+
+ kernel_fd = fds[0];
+ *fd_out = fds[1];
+
+ err = os_set_fd_block(*fd_out, 0);
+ if (err) {
+ printk("start_io_thread - failed to set nonblocking I/O.\n");
+ goto out_close;
+ }
+
+ pid = clone(io_thread, (void *) sp, CLONE_FILES | CLONE_VM, NULL);
+ if(pid < 0){
+ err = -errno;
+ printk("start_io_thread - clone failed : errno = %d\n", errno);
+ goto out_close;
+ }
+
+ return(pid);
+
+ out_close:
+ os_close_file(fds[0]);
+ os_close_file(fds[1]);
+ kernel_fd = -1;
+ *fd_out = -1;
+ out:
+ return err;
+}
diff --git a/arch/um/drivers/umcast.h b/arch/um/drivers/umcast.h
new file mode 100644
index 0000000..c190c64
--- /dev/null
+++ b/arch/um/drivers/umcast.h
@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __DRIVERS_UMCAST_H
+#define __DRIVERS_UMCAST_H
+
+#include <net_user.h>
+
+struct umcast_data {
+ char *addr;
+ unsigned short lport;
+ unsigned short rport;
+ void *listen_addr;
+ void *remote_addr;
+ int ttl;
+ int unicast;
+ void *dev;
+};
+
+extern const struct net_user_info umcast_user_info;
+
+extern int umcast_user_write(int fd, void *buf, int len,
+ struct umcast_data *pri);
+
+#endif
diff --git a/arch/um/drivers/umcast_kern.c b/arch/um/drivers/umcast_kern.c
new file mode 100644
index 0000000..f5ba6e3
--- /dev/null
+++ b/arch/um/drivers/umcast_kern.c
@@ -0,0 +1,188 @@
+/*
+ * user-mode-linux networking multicast transport
+ * Copyright (C) 2001 by Harald Welte <laforge@gnumonks.org>
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ *
+ * based on the existing uml-networking code, which is
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
+ * James Leu (jleu@mindspring.net).
+ * Copyright (C) 2001 by various other people who didn't put their name here.
+ *
+ * Licensed under the GPL.
+ */
+
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include "umcast.h"
+#include <net_kern.h>
+
+struct umcast_init {
+ char *addr;
+ int lport;
+ int rport;
+ int ttl;
+ bool unicast;
+};
+
+static void umcast_init(struct net_device *dev, void *data)
+{
+ struct uml_net_private *pri;
+ struct umcast_data *dpri;
+ struct umcast_init *init = data;
+
+ pri = netdev_priv(dev);
+ dpri = (struct umcast_data *) pri->user;
+ dpri->addr = init->addr;
+ dpri->lport = init->lport;
+ dpri->rport = init->rport;
+ dpri->unicast = init->unicast;
+ dpri->ttl = init->ttl;
+ dpri->dev = dev;
+
+ if (dpri->unicast) {
+ printk(KERN_INFO "ucast backend address: %s:%u listen port: "
+ "%u\n", dpri->addr, dpri->rport, dpri->lport);
+ } else {
+ printk(KERN_INFO "mcast backend multicast address: %s:%u, "
+ "TTL:%u\n", dpri->addr, dpri->lport, dpri->ttl);
+ }
+}
+
+static int umcast_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ return net_recvfrom(fd, skb_mac_header(skb),
+ skb->dev->mtu + ETH_HEADER_OTHER);
+}
+
+static int umcast_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ return umcast_user_write(fd, skb->data, skb->len,
+ (struct umcast_data *) &lp->user);
+}
+
+static const struct net_kern_info umcast_kern_info = {
+ .init = umcast_init,
+ .protocol = eth_protocol,
+ .read = umcast_read,
+ .write = umcast_write,
+};
+
+static int mcast_setup(char *str, char **mac_out, void *data)
+{
+ struct umcast_init *init = data;
+ char *port_str = NULL, *ttl_str = NULL, *remain;
+ char *last;
+
+ *init = ((struct umcast_init)
+ { .addr = "239.192.168.1",
+ .lport = 1102,
+ .ttl = 1 });
+
+ remain = split_if_spec(str, mac_out, &init->addr, &port_str, &ttl_str,
+ NULL);
+ if (remain != NULL) {
+ printk(KERN_ERR "mcast_setup - Extra garbage on "
+ "specification : '%s'\n", remain);
+ return 0;
+ }
+
+ if (port_str != NULL) {
+ init->lport = simple_strtoul(port_str, &last, 10);
+ if ((*last != '\0') || (last == port_str)) {
+ printk(KERN_ERR "mcast_setup - Bad port : '%s'\n",
+ port_str);
+ return 0;
+ }
+ }
+
+ if (ttl_str != NULL) {
+ init->ttl = simple_strtoul(ttl_str, &last, 10);
+ if ((*last != '\0') || (last == ttl_str)) {
+ printk(KERN_ERR "mcast_setup - Bad ttl : '%s'\n",
+ ttl_str);
+ return 0;
+ }
+ }
+
+ init->unicast = false;
+ init->rport = init->lport;
+
+ printk(KERN_INFO "Configured mcast device: %s:%u-%u\n", init->addr,
+ init->lport, init->ttl);
+
+ return 1;
+}
+
+static int ucast_setup(char *str, char **mac_out, void *data)
+{
+ struct umcast_init *init = data;
+ char *lport_str = NULL, *rport_str = NULL, *remain;
+ char *last;
+
+ *init = ((struct umcast_init)
+ { .addr = "",
+ .lport = 1102,
+ .rport = 1102 });
+
+ remain = split_if_spec(str, mac_out, &init->addr,
+ &lport_str, &rport_str, NULL);
+ if (remain != NULL) {
+ printk(KERN_ERR "ucast_setup - Extra garbage on "
+ "specification : '%s'\n", remain);
+ return 0;
+ }
+
+ if (lport_str != NULL) {
+ init->lport = simple_strtoul(lport_str, &last, 10);
+ if ((*last != '\0') || (last == lport_str)) {
+ printk(KERN_ERR "ucast_setup - Bad listen port : "
+ "'%s'\n", lport_str);
+ return 0;
+ }
+ }
+
+ if (rport_str != NULL) {
+ init->rport = simple_strtoul(rport_str, &last, 10);
+ if ((*last != '\0') || (last == rport_str)) {
+ printk(KERN_ERR "ucast_setup - Bad remote port : "
+ "'%s'\n", rport_str);
+ return 0;
+ }
+ }
+
+ init->unicast = true;
+
+ printk(KERN_INFO "Configured ucast device: :%u -> %s:%u\n",
+ init->lport, init->addr, init->rport);
+
+ return 1;
+}
+
+static struct transport mcast_transport = {
+ .list = LIST_HEAD_INIT(mcast_transport.list),
+ .name = "mcast",
+ .setup = mcast_setup,
+ .user = &umcast_user_info,
+ .kern = &umcast_kern_info,
+ .private_size = sizeof(struct umcast_data),
+ .setup_size = sizeof(struct umcast_init),
+};
+
+static struct transport ucast_transport = {
+ .list = LIST_HEAD_INIT(ucast_transport.list),
+ .name = "ucast",
+ .setup = ucast_setup,
+ .user = &umcast_user_info,
+ .kern = &umcast_kern_info,
+ .private_size = sizeof(struct umcast_data),
+ .setup_size = sizeof(struct umcast_init),
+};
+
+static int register_umcast(void)
+{
+ register_transport(&mcast_transport);
+ register_transport(&ucast_transport);
+ return 0;
+}
+
+late_initcall(register_umcast);
diff --git a/arch/um/drivers/umcast_user.c b/arch/um/drivers/umcast_user.c
new file mode 100644
index 0000000..6074184
--- /dev/null
+++ b/arch/um/drivers/umcast_user.c
@@ -0,0 +1,184 @@
+/*
+ * user-mode-linux networking multicast transport
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Copyright (C) 2001 by Harald Welte <laforge@gnumonks.org>
+ *
+ * based on the existing uml-networking code, which is
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
+ * James Leu (jleu@mindspring.net).
+ * Copyright (C) 2001 by various other people who didn't put their name here.
+ *
+ * Licensed under the GPL.
+ *
+ */
+
+#include <unistd.h>
+#include <errno.h>
+#include <netinet/in.h>
+#include "umcast.h"
+#include <net_user.h>
+#include <um_malloc.h>
+
+static struct sockaddr_in *new_addr(char *addr, unsigned short port)
+{
+ struct sockaddr_in *sin;
+
+ sin = uml_kmalloc(sizeof(struct sockaddr_in), UM_GFP_KERNEL);
+ if (sin == NULL) {
+ printk(UM_KERN_ERR "new_addr: allocation of sockaddr_in "
+ "failed\n");
+ return NULL;
+ }
+ sin->sin_family = AF_INET;
+ if (addr)
+ sin->sin_addr.s_addr = in_aton(addr);
+ else
+ sin->sin_addr.s_addr = INADDR_ANY;
+ sin->sin_port = htons(port);
+ return sin;
+}
+
+static int umcast_user_init(void *data, void *dev)
+{
+ struct umcast_data *pri = data;
+
+ pri->remote_addr = new_addr(pri->addr, pri->rport);
+ if (pri->unicast)
+ pri->listen_addr = new_addr(NULL, pri->lport);
+ else
+ pri->listen_addr = pri->remote_addr;
+ pri->dev = dev;
+ return 0;
+}
+
+static void umcast_remove(void *data)
+{
+ struct umcast_data *pri = data;
+
+ kfree(pri->listen_addr);
+ if (pri->unicast)
+ kfree(pri->remote_addr);
+ pri->listen_addr = pri->remote_addr = NULL;
+}
+
+static int umcast_open(void *data)
+{
+ struct umcast_data *pri = data;
+ struct sockaddr_in *lsin = pri->listen_addr;
+ struct sockaddr_in *rsin = pri->remote_addr;
+ struct ip_mreq mreq;
+ int fd, yes = 1, err = -EINVAL;
+
+
+ if ((!pri->unicast && lsin->sin_addr.s_addr == 0) ||
+ (rsin->sin_addr.s_addr == 0) ||
+ (lsin->sin_port == 0) || (rsin->sin_port == 0))
+ goto out;
+
+ fd = socket(AF_INET, SOCK_DGRAM, 0);
+
+ if (fd < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "umcast_open : data socket failed, "
+ "errno = %d\n", errno);
+ goto out;
+ }
+
+ if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "umcast_open: SO_REUSEADDR failed, "
+ "errno = %d\n", errno);
+ goto out_close;
+ }
+
+ if (!pri->unicast) {
+ /* set ttl according to config */
+ if (setsockopt(fd, SOL_IP, IP_MULTICAST_TTL, &pri->ttl,
+ sizeof(pri->ttl)) < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "umcast_open: IP_MULTICAST_TTL "
+ "failed, error = %d\n", errno);
+ goto out_close;
+ }
+
+ /* set LOOP, so data does get fed back to local sockets */
+ if (setsockopt(fd, SOL_IP, IP_MULTICAST_LOOP,
+ &yes, sizeof(yes)) < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "umcast_open: IP_MULTICAST_LOOP "
+ "failed, error = %d\n", errno);
+ goto out_close;
+ }
+ }
+
+ /* bind socket to the address */
+ if (bind(fd, (struct sockaddr *) lsin, sizeof(*lsin)) < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "umcast_open : data bind failed, "
+ "errno = %d\n", errno);
+ goto out_close;
+ }
+
+ if (!pri->unicast) {
+ /* subscribe to the multicast group */
+ mreq.imr_multiaddr.s_addr = lsin->sin_addr.s_addr;
+ mreq.imr_interface.s_addr = 0;
+ if (setsockopt(fd, SOL_IP, IP_ADD_MEMBERSHIP,
+ &mreq, sizeof(mreq)) < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "umcast_open: IP_ADD_MEMBERSHIP "
+ "failed, error = %d\n", errno);
+ printk(UM_KERN_ERR "There appears not to be a "
+ "multicast-capable network interface on the "
+ "host.\n");
+ printk(UM_KERN_ERR "eth0 should be configured in order "
+ "to use the multicast transport.\n");
+ goto out_close;
+ }
+ }
+
+ return fd;
+
+ out_close:
+ close(fd);
+ out:
+ return err;
+}
+
+static void umcast_close(int fd, void *data)
+{
+ struct umcast_data *pri = data;
+
+ if (!pri->unicast) {
+ struct ip_mreq mreq;
+ struct sockaddr_in *lsin = pri->listen_addr;
+
+ mreq.imr_multiaddr.s_addr = lsin->sin_addr.s_addr;
+ mreq.imr_interface.s_addr = 0;
+ if (setsockopt(fd, SOL_IP, IP_DROP_MEMBERSHIP,
+ &mreq, sizeof(mreq)) < 0) {
+ printk(UM_KERN_ERR "umcast_close: IP_DROP_MEMBERSHIP "
+ "failed, error = %d\n", errno);
+ }
+ }
+
+ close(fd);
+}
+
+int umcast_user_write(int fd, void *buf, int len, struct umcast_data *pri)
+{
+ struct sockaddr_in *data_addr = pri->remote_addr;
+
+ return net_sendto(fd, buf, len, data_addr, sizeof(*data_addr));
+}
+
+const struct net_user_info umcast_user_info = {
+ .init = umcast_user_init,
+ .open = umcast_open,
+ .close = umcast_close,
+ .remove = umcast_remove,
+ .add_address = NULL,
+ .delete_address = NULL,
+ .mtu = ETH_MAX_PACKET,
+ .max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
+};
diff --git a/arch/um/drivers/vde.h b/arch/um/drivers/vde.h
new file mode 100644
index 0000000..fc3a059
--- /dev/null
+++ b/arch/um/drivers/vde.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2007 Luca Bigliardi (shammash@artha.org).
+ * Licensed under the GPL.
+ */
+
+#ifndef __UM_VDE_H__
+#define __UM_VDE_H__
+
+struct vde_data {
+ char *vde_switch;
+ char *descr;
+ void *args;
+ void *conn;
+ void *dev;
+};
+
+struct vde_init {
+ char *vde_switch;
+ char *descr;
+ int port;
+ char *group;
+ int mode;
+};
+
+extern const struct net_user_info vde_user_info;
+
+extern void vde_init_libstuff(struct vde_data *vpri, struct vde_init *init);
+
+extern int vde_user_read(void *conn, void *buf, int len);
+extern int vde_user_write(void *conn, void *buf, int len);
+
+#endif
diff --git a/arch/um/drivers/vde_kern.c b/arch/um/drivers/vde_kern.c
new file mode 100644
index 0000000..6a365fa
--- /dev/null
+++ b/arch/um/drivers/vde_kern.c
@@ -0,0 +1,129 @@
+/*
+ * Copyright (C) 2007 Luca Bigliardi (shammash@artha.org).
+ * Licensed under the GPL.
+ *
+ * Transport usage:
+ * ethN=vde,<vde_switch>,<mac addr>,<port>,<group>,<mode>,<description>
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <net_kern.h>
+#include <net_user.h>
+#include "vde.h"
+
+static void vde_init(struct net_device *dev, void *data)
+{
+ struct vde_init *init = data;
+ struct uml_net_private *pri;
+ struct vde_data *vpri;
+
+ pri = netdev_priv(dev);
+ vpri = (struct vde_data *) pri->user;
+
+ vpri->vde_switch = init->vde_switch;
+ vpri->descr = init->descr ? init->descr : "UML vde_transport";
+ vpri->args = NULL;
+ vpri->conn = NULL;
+ vpri->dev = dev;
+
+ printk("vde backend - %s, ", vpri->vde_switch ?
+ vpri->vde_switch : "(default socket)");
+
+ vde_init_libstuff(vpri, init);
+
+ printk("\n");
+}
+
+static int vde_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ struct vde_data *pri = (struct vde_data *) &lp->user;
+
+ if (pri->conn != NULL)
+ return vde_user_read(pri->conn, skb_mac_header(skb),
+ skb->dev->mtu + ETH_HEADER_OTHER);
+
+ printk(KERN_ERR "vde_read - we have no VDECONN to read from");
+ return -EBADF;
+}
+
+static int vde_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ struct vde_data *pri = (struct vde_data *) &lp->user;
+
+ if (pri->conn != NULL)
+ return vde_user_write((void *)pri->conn, skb->data,
+ skb->len);
+
+ printk(KERN_ERR "vde_write - we have no VDECONN to write to");
+ return -EBADF;
+}
+
+static const struct net_kern_info vde_kern_info = {
+ .init = vde_init,
+ .protocol = eth_protocol,
+ .read = vde_read,
+ .write = vde_write,
+};
+
+static int vde_setup(char *str, char **mac_out, void *data)
+{
+ struct vde_init *init = data;
+ char *remain, *port_str = NULL, *mode_str = NULL, *last;
+
+ *init = ((struct vde_init)
+ { .vde_switch = NULL,
+ .descr = NULL,
+ .port = 0,
+ .group = NULL,
+ .mode = 0 });
+
+ remain = split_if_spec(str, &init->vde_switch, mac_out, &port_str,
+ &init->group, &mode_str, &init->descr, NULL);
+
+ if (remain != NULL)
+ printk(KERN_WARNING "vde_setup - Ignoring extra data :"
+ "'%s'\n", remain);
+
+ if (port_str != NULL) {
+ init->port = simple_strtoul(port_str, &last, 10);
+ if ((*last != '\0') || (last == port_str)) {
+ printk(KERN_ERR "vde_setup - Bad port : '%s'\n",
+ port_str);
+ return 0;
+ }
+ }
+
+ if (mode_str != NULL) {
+ init->mode = simple_strtoul(mode_str, &last, 8);
+ if ((*last != '\0') || (last == mode_str)) {
+ printk(KERN_ERR "vde_setup - Bad mode : '%s'\n",
+ mode_str);
+ return 0;
+ }
+ }
+
+ printk(KERN_INFO "Configured vde device: %s\n", init->vde_switch ?
+ init->vde_switch : "(default socket)");
+
+ return 1;
+}
+
+static struct transport vde_transport = {
+ .list = LIST_HEAD_INIT(vde_transport.list),
+ .name = "vde",
+ .setup = vde_setup,
+ .user = &vde_user_info,
+ .kern = &vde_kern_info,
+ .private_size = sizeof(struct vde_data),
+ .setup_size = sizeof(struct vde_init),
+};
+
+static int register_vde(void)
+{
+ register_transport(&vde_transport);
+ return 0;
+}
+
+late_initcall(register_vde);
diff --git a/arch/um/drivers/vde_user.c b/arch/um/drivers/vde_user.c
new file mode 100644
index 0000000..64cb630
--- /dev/null
+++ b/arch/um/drivers/vde_user.c
@@ -0,0 +1,125 @@
+/*
+ * Copyright (C) 2007 Luca Bigliardi (shammash@artha.org).
+ * Licensed under the GPL.
+ */
+
+#include <stddef.h>
+#include <errno.h>
+#include <libvdeplug.h>
+#include <net_user.h>
+#include <um_malloc.h>
+#include "vde.h"
+
+static int vde_user_init(void *data, void *dev)
+{
+ struct vde_data *pri = data;
+ VDECONN *conn = NULL;
+ int err = -EINVAL;
+
+ pri->dev = dev;
+
+ conn = vde_open(pri->vde_switch, pri->descr, pri->args);
+
+ if (conn == NULL) {
+ err = -errno;
+ printk(UM_KERN_ERR "vde_user_init: vde_open failed, "
+ "errno = %d\n", errno);
+ return err;
+ }
+
+ printk(UM_KERN_INFO "vde backend - connection opened\n");
+
+ pri->conn = conn;
+
+ return 0;
+}
+
+static int vde_user_open(void *data)
+{
+ struct vde_data *pri = data;
+
+ if (pri->conn != NULL)
+ return vde_datafd(pri->conn);
+
+ printk(UM_KERN_WARNING "vde_open - we have no VDECONN to open");
+ return -EINVAL;
+}
+
+static void vde_remove(void *data)
+{
+ struct vde_data *pri = data;
+
+ if (pri->conn != NULL) {
+ printk(UM_KERN_INFO "vde backend - closing connection\n");
+ vde_close(pri->conn);
+ pri->conn = NULL;
+ kfree(pri->args);
+ pri->args = NULL;
+ return;
+ }
+
+ printk(UM_KERN_WARNING "vde_remove - we have no VDECONN to remove");
+}
+
+const struct net_user_info vde_user_info = {
+ .init = vde_user_init,
+ .open = vde_user_open,
+ .close = NULL,
+ .remove = vde_remove,
+ .add_address = NULL,
+ .delete_address = NULL,
+ .mtu = ETH_MAX_PACKET,
+ .max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
+};
+
+void vde_init_libstuff(struct vde_data *vpri, struct vde_init *init)
+{
+ struct vde_open_args *args;
+
+ vpri->args = uml_kmalloc(sizeof(struct vde_open_args), UM_GFP_KERNEL);
+ if (vpri->args == NULL) {
+ printk(UM_KERN_ERR "vde_init_libstuff - vde_open_args "
+ "allocation failed");
+ return;
+ }
+
+ args = vpri->args;
+
+ args->port = init->port;
+ args->group = init->group;
+ args->mode = init->mode ? init->mode : 0700;
+
+ args->port ? printk("port %d", args->port) :
+ printk("undefined port");
+}
+
+int vde_user_read(void *conn, void *buf, int len)
+{
+ VDECONN *vconn = conn;
+ int rv;
+
+ if (vconn == NULL)
+ return 0;
+
+ rv = vde_recv(vconn, buf, len, 0);
+ if (rv < 0) {
+ if (errno == EAGAIN)
+ return 0;
+ return -errno;
+ }
+ else if (rv == 0)
+ return -ENOTCONN;
+
+ return rv;
+}
+
+int vde_user_write(void *conn, void *buf, int len)
+{
+ VDECONN *vconn = conn;
+
+ if (vconn == NULL)
+ return 0;
+
+ return vde_send(vconn, buf, len, 0);
+}
+
diff --git a/arch/um/drivers/xterm.c b/arch/um/drivers/xterm.c
new file mode 100644
index 0000000..20e30be
--- /dev/null
+++ b/arch/um/drivers/xterm.c
@@ -0,0 +1,223 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <termios.h>
+#include "chan_user.h"
+#include <os.h>
+#include <um_malloc.h>
+#include "xterm.h"
+
+struct xterm_chan {
+ int pid;
+ int helper_pid;
+ char *title;
+ int device;
+ int raw;
+ struct termios tt;
+};
+
+static void *xterm_init(char *str, int device, const struct chan_opts *opts)
+{
+ struct xterm_chan *data;
+
+ data = uml_kmalloc(sizeof(*data), UM_GFP_KERNEL);
+ if (data == NULL)
+ return NULL;
+ *data = ((struct xterm_chan) { .pid = -1,
+ .helper_pid = -1,
+ .device = device,
+ .title = opts->xterm_title,
+ .raw = opts->raw } );
+ return data;
+}
+
+/* Only changed by xterm_setup, which is a setup */
+static char *terminal_emulator = "xterm";
+static char *title_switch = "-T";
+static char *exec_switch = "-e";
+
+static int __init xterm_setup(char *line, int *add)
+{
+ *add = 0;
+ terminal_emulator = line;
+
+ line = strchr(line, ',');
+ if (line == NULL)
+ return 0;
+
+ *line++ = '\0';
+ if (*line)
+ title_switch = line;
+
+ line = strchr(line, ',');
+ if (line == NULL)
+ return 0;
+
+ *line++ = '\0';
+ if (*line)
+ exec_switch = line;
+
+ return 0;
+}
+
+__uml_setup("xterm=", xterm_setup,
+"xterm=<terminal emulator>,<title switch>,<exec switch>\n"
+" Specifies an alternate terminal emulator to use for the debugger,\n"
+" consoles, and serial lines when they are attached to the xterm channel.\n"
+" The values are the terminal emulator binary, the switch it uses to set\n"
+" its title, and the switch it uses to execute a subprocess,\n"
+" respectively. The title switch must have the form '<switch> title',\n"
+" not '<switch>=title'. Similarly, the exec switch must have the form\n"
+" '<switch> command arg1 arg2 ...'.\n"
+" The default values are 'xterm=xterm,-T,-e'. Values for gnome-terminal\n"
+" are 'xterm=gnome-terminal,-t,-x'.\n\n"
+);
+
+static int xterm_open(int input, int output, int primary, void *d,
+ char **dev_out)
+{
+ struct xterm_chan *data = d;
+ int pid, fd, new, err;
+ char title[256], file[] = "/tmp/xterm-pipeXXXXXX";
+ char *argv[] = { terminal_emulator, title_switch, title, exec_switch,
+ OS_LIB_PATH "/uml/port-helper", "-uml-socket",
+ file, NULL };
+
+ if (access(argv[4], X_OK) < 0)
+ argv[4] = "port-helper";
+
+ /*
+ * Check that DISPLAY is set, this doesn't guarantee the xterm
+ * will work but w/o it we can be pretty sure it won't.
+ */
+ if (getenv("DISPLAY") == NULL) {
+ printk(UM_KERN_ERR "xterm_open: $DISPLAY not set.\n");
+ return -ENODEV;
+ }
+
+ /*
+ * This business of getting a descriptor to a temp file,
+ * deleting the file and closing the descriptor is just to get
+ * a known-unused name for the Unix socket that we really
+ * want.
+ */
+ fd = mkstemp(file);
+ if (fd < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "xterm_open : mkstemp failed, errno = %d\n",
+ errno);
+ return err;
+ }
+
+ if (unlink(file)) {
+ err = -errno;
+ printk(UM_KERN_ERR "xterm_open : unlink failed, errno = %d\n",
+ errno);
+ close(fd);
+ return err;
+ }
+ close(fd);
+
+ fd = os_create_unix_socket(file, sizeof(file), 1);
+ if (fd < 0) {
+ printk(UM_KERN_ERR "xterm_open : create_unix_socket failed, "
+ "errno = %d\n", -fd);
+ return fd;
+ }
+
+ sprintf(title, data->title, data->device);
+ pid = run_helper(NULL, NULL, argv);
+ if (pid < 0) {
+ err = pid;
+ printk(UM_KERN_ERR "xterm_open : run_helper failed, "
+ "errno = %d\n", -err);
+ goto out_close1;
+ }
+
+ err = os_set_fd_block(fd, 0);
+ if (err < 0) {
+ printk(UM_KERN_ERR "xterm_open : failed to set descriptor "
+ "non-blocking, err = %d\n", -err);
+ goto out_kill;
+ }
+
+ new = xterm_fd(fd, &data->helper_pid);
+ if (new < 0) {
+ err = new;
+ printk(UM_KERN_ERR "xterm_open : os_rcv_fd failed, err = %d\n",
+ -err);
+ goto out_kill;
+ }
+
+ err = os_set_fd_block(new, 0);
+ if (err) {
+ printk(UM_KERN_ERR "xterm_open : failed to set xterm "
+ "descriptor non-blocking, err = %d\n", -err);
+ goto out_close2;
+ }
+
+ CATCH_EINTR(err = tcgetattr(new, &data->tt));
+ if (err) {
+ new = err;
+ goto out_close2;
+ }
+
+ if (data->raw) {
+ err = raw(new);
+ if (err) {
+ new = err;
+ goto out_close2;
+ }
+ }
+
+ unlink(file);
+ data->pid = pid;
+ *dev_out = NULL;
+
+ return new;
+
+ out_close2:
+ close(new);
+ out_kill:
+ os_kill_process(pid, 1);
+ out_close1:
+ close(fd);
+
+ return err;
+}
+
+static void xterm_close(int fd, void *d)
+{
+ struct xterm_chan *data = d;
+
+ if (data->pid != -1)
+ os_kill_process(data->pid, 1);
+ data->pid = -1;
+
+ if (data->helper_pid != -1)
+ os_kill_process(data->helper_pid, 0);
+ data->helper_pid = -1;
+
+ os_close_file(fd);
+}
+
+const struct chan_ops xterm_ops = {
+ .type = "xterm",
+ .init = xterm_init,
+ .open = xterm_open,
+ .close = xterm_close,
+ .read = generic_read,
+ .write = generic_write,
+ .console_write = generic_console_write,
+ .window_size = generic_window_size,
+ .free = generic_free,
+ .winch = 1,
+};
diff --git a/arch/um/drivers/xterm.h b/arch/um/drivers/xterm.h
new file mode 100644
index 0000000..56b9c4a
--- /dev/null
+++ b/arch/um/drivers/xterm.h
@@ -0,0 +1,12 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __XTERM_H__
+#define __XTERM_H__
+
+extern int xterm_fd(int socket, int *pid_out);
+
+#endif
+
diff --git a/arch/um/drivers/xterm_kern.c b/arch/um/drivers/xterm_kern.c
new file mode 100644
index 0000000..e8f9957
--- /dev/null
+++ b/arch/um/drivers/xterm_kern.c
@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/slab.h>
+#include <linux/completion.h>
+#include <linux/irqreturn.h>
+#include <asm/irq.h>
+#include <irq_kern.h>
+#include <os.h>
+
+struct xterm_wait {
+ struct completion ready;
+ int fd;
+ int pid;
+ int new_fd;
+};
+
+static irqreturn_t xterm_interrupt(int irq, void *data)
+{
+ struct xterm_wait *xterm = data;
+ int fd;
+
+ fd = os_rcv_fd(xterm->fd, &xterm->pid);
+ if (fd == -EAGAIN)
+ return IRQ_NONE;
+
+ xterm->new_fd = fd;
+ complete(&xterm->ready);
+
+ return IRQ_HANDLED;
+}
+
+int xterm_fd(int socket, int *pid_out)
+{
+ struct xterm_wait *data;
+ int err, ret;
+
+ data = kmalloc(sizeof(*data), GFP_KERNEL);
+ if (data == NULL) {
+ printk(KERN_ERR "xterm_fd : failed to allocate xterm_wait\n");
+ return -ENOMEM;
+ }
+
+ /* This is a locked semaphore... */
+ *data = ((struct xterm_wait) { .fd = socket,
+ .pid = -1,
+ .new_fd = -1 });
+ init_completion(&data->ready);
+
+ err = um_request_irq(XTERM_IRQ, socket, IRQ_READ, xterm_interrupt,
+ IRQF_SHARED, "xterm", data);
+ if (err) {
+ printk(KERN_ERR "xterm_fd : failed to get IRQ for xterm, "
+ "err = %d\n", err);
+ ret = err;
+ goto out;
+ }
+
+ /* ... so here we wait for an xterm interrupt.
+ *
+ * XXX Note, if the xterm doesn't work for some reason (eg. DISPLAY
+ * isn't set) this will hang... */
+ wait_for_completion(&data->ready);
+
+ um_free_irq(XTERM_IRQ, data);
+
+ ret = data->new_fd;
+ *pid_out = data->pid;
+ out:
+ kfree(data);
+
+ return ret;
+}
diff --git a/arch/um/include/asm/Kbuild b/arch/um/include/asm/Kbuild
new file mode 100644
index 0000000..904f3eb
--- /dev/null
+++ b/arch/um/include/asm/Kbuild
@@ -0,0 +1,29 @@
+generic-y += barrier.h
+generic-y += bug.h
+generic-y += clkdev.h
+generic-y += cputime.h
+generic-y += current.h
+generic-y += delay.h
+generic-y += device.h
+generic-y += emergency-restart.h
+generic-y += exec.h
+generic-y += ftrace.h
+generic-y += futex.h
+generic-y += hardirq.h
+generic-y += hw_irq.h
+generic-y += io.h
+generic-y += irq_regs.h
+generic-y += irq_work.h
+generic-y += kdebug.h
+generic-y += mcs_spinlock.h
+generic-y += mm-arch-hooks.h
+generic-y += mutex.h
+generic-y += param.h
+generic-y += pci.h
+generic-y += percpu.h
+generic-y += preempt.h
+generic-y += switch_to.h
+generic-y += topology.h
+generic-y += trace_clock.h
+generic-y += word-at-a-time.h
+generic-y += xor.h
diff --git a/arch/um/include/asm/a.out-core.h b/arch/um/include/asm/a.out-core.h
new file mode 100644
index 0000000..995643b
--- /dev/null
+++ b/arch/um/include/asm/a.out-core.h
@@ -0,0 +1,27 @@
+/* a.out coredump register dumper
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#ifndef __UM_A_OUT_CORE_H
+#define __UM_A_OUT_CORE_H
+
+#ifdef __KERNEL__
+
+#include <linux/user.h>
+
+/*
+ * fill in the user structure for an a.out core dump
+ */
+static inline void aout_dump_thread(struct pt_regs *regs, struct user *u)
+{
+}
+
+#endif /* __KERNEL__ */
+#endif /* __UM_A_OUT_CORE_H */
diff --git a/arch/um/include/asm/bugs.h b/arch/um/include/asm/bugs.h
new file mode 100644
index 0000000..6a72e24
--- /dev/null
+++ b/arch/um/include/asm/bugs.h
@@ -0,0 +1,6 @@
+#ifndef __UM_BUGS_H
+#define __UM_BUGS_H
+
+void check_bugs(void);
+
+#endif
diff --git a/arch/um/include/asm/cache.h b/arch/um/include/asm/cache.h
new file mode 100644
index 0000000..19e1bdd
--- /dev/null
+++ b/arch/um/include/asm/cache.h
@@ -0,0 +1,17 @@
+#ifndef __UM_CACHE_H
+#define __UM_CACHE_H
+
+
+#if defined(CONFIG_UML_X86) && !defined(CONFIG_64BIT)
+# define L1_CACHE_SHIFT (CONFIG_X86_L1_CACHE_SHIFT)
+#elif defined(CONFIG_UML_X86) /* 64-bit */
+# define L1_CACHE_SHIFT 6 /* Should be 7 on Intel */
+#else
+/* XXX: this was taken from x86, now it's completely random. Luckily only
+ * affects SMP padding. */
+# define L1_CACHE_SHIFT 5
+#endif
+
+#define L1_CACHE_BYTES (1 << L1_CACHE_SHIFT)
+
+#endif
diff --git a/arch/um/include/asm/common.lds.S b/arch/um/include/asm/common.lds.S
new file mode 100644
index 0000000..1330553
--- /dev/null
+++ b/arch/um/include/asm/common.lds.S
@@ -0,0 +1,107 @@
+#include <asm-generic/vmlinux.lds.h>
+
+ .fini : { *(.fini) } =0x9090
+ _etext = .;
+ PROVIDE (etext = .);
+
+ . = ALIGN(4096);
+ _sdata = .;
+ PROVIDE (sdata = .);
+
+ RODATA
+
+ .unprotected : { *(.unprotected) }
+ . = ALIGN(4096);
+ PROVIDE (_unprotected_end = .);
+
+ . = ALIGN(4096);
+ .note : { *(.note.*) }
+ EXCEPTION_TABLE(0)
+
+ BUG_TABLE
+
+ .uml.setup.init : {
+ __uml_setup_start = .;
+ *(.uml.setup.init)
+ __uml_setup_end = .;
+ }
+
+ .uml.help.init : {
+ __uml_help_start = .;
+ *(.uml.help.init)
+ __uml_help_end = .;
+ }
+
+ .uml.postsetup.init : {
+ __uml_postsetup_start = .;
+ *(.uml.postsetup.init)
+ __uml_postsetup_end = .;
+ }
+
+ .init.setup : {
+ INIT_SETUP(0)
+ }
+
+ PERCPU_SECTION(32)
+
+ .initcall.init : {
+ INIT_CALLS
+ }
+
+ .con_initcall.init : {
+ CON_INITCALL
+ }
+
+ .uml.initcall.init : {
+ __uml_initcall_start = .;
+ *(.uml.initcall.init)
+ __uml_initcall_end = .;
+ }
+
+ SECURITY_INIT
+
+ .exitcall : {
+ __exitcall_begin = .;
+ *(.exitcall.exit)
+ __exitcall_end = .;
+ }
+
+ .uml.exitcall : {
+ __uml_exitcall_begin = .;
+ *(.uml.exitcall.exit)
+ __uml_exitcall_end = .;
+ }
+
+ . = ALIGN(4);
+ .altinstructions : {
+ __alt_instructions = .;
+ *(.altinstructions)
+ __alt_instructions_end = .;
+ }
+ .altinstr_replacement : { *(.altinstr_replacement) }
+ /* .exit.text is discard at runtime, not link time, to deal with references
+ from .altinstructions and .eh_frame */
+ .exit.text : { EXIT_TEXT }
+ .exit.data : { *(.exit.data) }
+
+ .preinit_array : {
+ __preinit_array_start = .;
+ *(.preinit_array)
+ __preinit_array_end = .;
+ }
+ .init_array : {
+ __init_array_start = .;
+ *(.init_array)
+ __init_array_end = .;
+ }
+ .fini_array : {
+ __fini_array_start = .;
+ *(.fini_array)
+ __fini_array_end = .;
+ }
+
+ . = ALIGN(4096);
+ .init.ramfs : {
+ INIT_RAM_FS
+ }
+
diff --git a/arch/um/include/asm/dma.h b/arch/um/include/asm/dma.h
new file mode 100644
index 0000000..f88c586
--- /dev/null
+++ b/arch/um/include/asm/dma.h
@@ -0,0 +1,10 @@
+#ifndef __UM_DMA_H
+#define __UM_DMA_H
+
+#include <asm/io.h>
+
+extern unsigned long uml_physmem;
+
+#define MAX_DMA_ADDRESS (uml_physmem)
+
+#endif
diff --git a/arch/um/include/asm/fixmap.h b/arch/um/include/asm/fixmap.h
new file mode 100644
index 0000000..1761fd7
--- /dev/null
+++ b/arch/um/include/asm/fixmap.h
@@ -0,0 +1,56 @@
+#ifndef __UM_FIXMAP_H
+#define __UM_FIXMAP_H
+
+#include <asm/processor.h>
+#include <asm/kmap_types.h>
+#include <asm/archparam.h>
+#include <asm/page.h>
+#include <linux/threads.h>
+
+/*
+ * Here we define all the compile-time 'special' virtual
+ * addresses. The point is to have a constant address at
+ * compile time, but to set the physical address only
+ * in the boot process. We allocate these special addresses
+ * from the end of virtual memory (0xfffff000) backwards.
+ * Also this lets us do fail-safe vmalloc(), we
+ * can guarantee that these special addresses and
+ * vmalloc()-ed addresses never overlap.
+ *
+ * these 'compile-time allocated' memory buffers are
+ * fixed-size 4k pages. (or larger if used with an increment
+ * highger than 1) use fixmap_set(idx,phys) to associate
+ * physical memory with fixmap indices.
+ *
+ * TLB entries of such buffers will not be flushed across
+ * task switches.
+ */
+
+/*
+ * on UP currently we will have no trace of the fixmap mechanizm,
+ * no page table allocations, etc. This might change in the
+ * future, say framebuffers for the console driver(s) could be
+ * fix-mapped?
+ */
+enum fixed_addresses {
+ __end_of_fixed_addresses
+};
+
+extern void __set_fixmap (enum fixed_addresses idx,
+ unsigned long phys, pgprot_t flags);
+
+/*
+ * used by vmalloc.c.
+ *
+ * Leave one empty page between vmalloc'ed areas and
+ * the start of the fixmap, and leave one page empty
+ * at the top of mem..
+ */
+
+#define FIXADDR_TOP (TASK_SIZE - 2 * PAGE_SIZE)
+#define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
+#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
+
+#include <asm-generic/fixmap.h>
+
+#endif
diff --git a/arch/um/include/asm/irq.h b/arch/um/include/asm/irq.h
new file mode 100644
index 0000000..4a2037f
--- /dev/null
+++ b/arch/um/include/asm/irq.h
@@ -0,0 +1,23 @@
+#ifndef __UM_IRQ_H
+#define __UM_IRQ_H
+
+#define TIMER_IRQ 0
+#define UMN_IRQ 1
+#define CONSOLE_IRQ 2
+#define CONSOLE_WRITE_IRQ 3
+#define UBD_IRQ 4
+#define UM_ETH_IRQ 5
+#define SSL_IRQ 6
+#define SSL_WRITE_IRQ 7
+#define ACCEPT_IRQ 8
+#define MCONSOLE_IRQ 9
+#define WINCH_IRQ 10
+#define SIGIO_WRITE_IRQ 11
+#define TELNETD_IRQ 12
+#define XTERM_IRQ 13
+#define RANDOM_IRQ 14
+
+#define LAST_IRQ RANDOM_IRQ
+#define NR_IRQS (LAST_IRQ + 1)
+
+#endif
diff --git a/arch/um/include/asm/irqflags.h b/arch/um/include/asm/irqflags.h
new file mode 100644
index 0000000..c780d8a
--- /dev/null
+++ b/arch/um/include/asm/irqflags.h
@@ -0,0 +1,42 @@
+#ifndef __UM_IRQFLAGS_H
+#define __UM_IRQFLAGS_H
+
+extern int get_signals(void);
+extern int set_signals(int enable);
+extern void block_signals(void);
+extern void unblock_signals(void);
+
+static inline unsigned long arch_local_save_flags(void)
+{
+ return get_signals();
+}
+
+static inline void arch_local_irq_restore(unsigned long flags)
+{
+ set_signals(flags);
+}
+
+static inline void arch_local_irq_enable(void)
+{
+ unblock_signals();
+}
+
+static inline void arch_local_irq_disable(void)
+{
+ block_signals();
+}
+
+static inline unsigned long arch_local_irq_save(void)
+{
+ unsigned long flags;
+ flags = arch_local_save_flags();
+ arch_local_irq_disable();
+ return flags;
+}
+
+static inline bool arch_irqs_disabled(void)
+{
+ return arch_local_save_flags() == 0;
+}
+
+#endif
diff --git a/arch/um/include/asm/kmap_types.h b/arch/um/include/asm/kmap_types.h
new file mode 100644
index 0000000..2e0a6b1
--- /dev/null
+++ b/arch/um/include/asm/kmap_types.h
@@ -0,0 +1,13 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_KMAP_TYPES_H
+#define __UM_KMAP_TYPES_H
+
+/* No more #include "asm/arch/kmap_types.h" ! */
+
+#define KM_TYPE_NR 14
+
+#endif
diff --git a/arch/um/include/asm/kvm_para.h b/arch/um/include/asm/kvm_para.h
new file mode 100644
index 0000000..14fab8f
--- /dev/null
+++ b/arch/um/include/asm/kvm_para.h
@@ -0,0 +1 @@
+#include <asm-generic/kvm_para.h>
diff --git a/arch/um/include/asm/mmu.h b/arch/um/include/asm/mmu.h
new file mode 100644
index 0000000..da70544
--- /dev/null
+++ b/arch/um/include/asm/mmu.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __ARCH_UM_MMU_H
+#define __ARCH_UM_MMU_H
+
+#include <mm_id.h>
+#include <asm/mm_context.h>
+
+typedef struct mm_context {
+ struct mm_id id;
+ struct uml_arch_mm_context arch;
+ struct page *stub_pages[2];
+} mm_context_t;
+
+extern void __switch_mm(struct mm_id * mm_idp);
+
+/* Avoid tangled inclusion with asm/ldt.h */
+extern long init_new_ldt(struct mm_context *to_mm, struct mm_context *from_mm);
+extern void free_ldt(struct mm_context *mm);
+
+#endif
diff --git a/arch/um/include/asm/mmu_context.h b/arch/um/include/asm/mmu_context.h
new file mode 100644
index 0000000..941527e
--- /dev/null
+++ b/arch/um/include/asm/mmu_context.h
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_MMU_CONTEXT_H
+#define __UM_MMU_CONTEXT_H
+
+#include <linux/sched.h>
+#include <asm/mmu.h>
+
+extern void uml_setup_stubs(struct mm_struct *mm);
+/*
+ * Needed since we do not use the asm-generic/mm_hooks.h:
+ */
+static inline void arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
+{
+ uml_setup_stubs(mm);
+}
+extern void arch_exit_mmap(struct mm_struct *mm);
+static inline void arch_unmap(struct mm_struct *mm,
+ struct vm_area_struct *vma,
+ unsigned long start, unsigned long end)
+{
+}
+static inline void arch_bprm_mm_init(struct mm_struct *mm,
+ struct vm_area_struct *vma)
+{
+}
+/*
+ * end asm-generic/mm_hooks.h functions
+ */
+
+#define deactivate_mm(tsk,mm) do { } while (0)
+
+extern void force_flush_all(void);
+
+static inline void activate_mm(struct mm_struct *old, struct mm_struct *new)
+{
+ /*
+ * This is called by fs/exec.c and sys_unshare()
+ * when the new ->mm is used for the first time.
+ */
+ __switch_mm(&new->context.id);
+ down_write(&new->mmap_sem);
+ uml_setup_stubs(new);
+ up_write(&new->mmap_sem);
+}
+
+static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
+ struct task_struct *tsk)
+{
+ unsigned cpu = smp_processor_id();
+
+ if(prev != next){
+ cpumask_clear_cpu(cpu, mm_cpumask(prev));
+ cpumask_set_cpu(cpu, mm_cpumask(next));
+ if(next != &init_mm)
+ __switch_mm(&next->context.id);
+ }
+}
+
+static inline void enter_lazy_tlb(struct mm_struct *mm,
+ struct task_struct *tsk)
+{
+}
+
+extern int init_new_context(struct task_struct *task, struct mm_struct *mm);
+
+extern void destroy_context(struct mm_struct *mm);
+
+#endif
diff --git a/arch/um/include/asm/page.h b/arch/um/include/asm/page.h
new file mode 100644
index 0000000..71c5d13
--- /dev/null
+++ b/arch/um/include/asm/page.h
@@ -0,0 +1,127 @@
+/*
+ * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
+ * Copyright 2003 PathScale, Inc.
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_PAGE_H
+#define __UM_PAGE_H
+
+#include <linux/const.h>
+
+/* PAGE_SHIFT determines the page size */
+#define PAGE_SHIFT 12
+#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
+#define PAGE_MASK (~(PAGE_SIZE-1))
+
+#ifndef __ASSEMBLY__
+
+struct page;
+
+#include <linux/types.h>
+#include <asm/vm-flags.h>
+
+/*
+ * These are used to make use of C type-checking..
+ */
+
+#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
+#define copy_page(to,from) memcpy((void *)(to), (void *)(from), PAGE_SIZE)
+
+#define clear_user_page(page, vaddr, pg) clear_page(page)
+#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
+
+#if defined(CONFIG_3_LEVEL_PGTABLES) && !defined(CONFIG_64BIT)
+
+typedef struct { unsigned long pte_low, pte_high; } pte_t;
+typedef struct { unsigned long pmd; } pmd_t;
+typedef struct { unsigned long pgd; } pgd_t;
+#define pte_val(x) ((x).pte_low | ((unsigned long long) (x).pte_high << 32))
+
+#define pte_get_bits(pte, bits) ((pte).pte_low & (bits))
+#define pte_set_bits(pte, bits) ((pte).pte_low |= (bits))
+#define pte_clear_bits(pte, bits) ((pte).pte_low &= ~(bits))
+#define pte_copy(to, from) ({ (to).pte_high = (from).pte_high; \
+ smp_wmb(); \
+ (to).pte_low = (from).pte_low; })
+#define pte_is_zero(pte) (!((pte).pte_low & ~_PAGE_NEWPAGE) && !(pte).pte_high)
+#define pte_set_val(pte, phys, prot) \
+ ({ (pte).pte_high = (phys) >> 32; \
+ (pte).pte_low = (phys) | pgprot_val(prot); })
+
+#define pmd_val(x) ((x).pmd)
+#define __pmd(x) ((pmd_t) { (x) } )
+
+typedef unsigned long long pfn_t;
+typedef unsigned long long phys_t;
+
+#else
+
+typedef struct { unsigned long pte; } pte_t;
+typedef struct { unsigned long pgd; } pgd_t;
+
+#ifdef CONFIG_3_LEVEL_PGTABLES
+typedef struct { unsigned long pmd; } pmd_t;
+#define pmd_val(x) ((x).pmd)
+#define __pmd(x) ((pmd_t) { (x) } )
+#endif
+
+#define pte_val(x) ((x).pte)
+
+
+#define pte_get_bits(p, bits) ((p).pte & (bits))
+#define pte_set_bits(p, bits) ((p).pte |= (bits))
+#define pte_clear_bits(p, bits) ((p).pte &= ~(bits))
+#define pte_copy(to, from) ((to).pte = (from).pte)
+#define pte_is_zero(p) (!((p).pte & ~_PAGE_NEWPAGE))
+#define pte_set_val(p, phys, prot) (p).pte = (phys | pgprot_val(prot))
+
+typedef unsigned long pfn_t;
+typedef unsigned long phys_t;
+
+#endif
+
+typedef struct { unsigned long pgprot; } pgprot_t;
+
+typedef struct page *pgtable_t;
+
+#define pgd_val(x) ((x).pgd)
+#define pgprot_val(x) ((x).pgprot)
+
+#define __pte(x) ((pte_t) { (x) } )
+#define __pgd(x) ((pgd_t) { (x) } )
+#define __pgprot(x) ((pgprot_t) { (x) } )
+
+extern unsigned long uml_physmem;
+
+#define PAGE_OFFSET (uml_physmem)
+#define KERNELBASE PAGE_OFFSET
+
+#define __va_space (8*1024*1024)
+
+#include <mem.h>
+
+/* Cast to unsigned long before casting to void * to avoid a warning from
+ * mmap_kmem about cutting a long long down to a void *. Not sure that
+ * casting is the right thing, but 32-bit UML can't have 64-bit virtual
+ * addresses
+ */
+#define __pa(virt) to_phys((void *) (unsigned long) (virt))
+#define __va(phys) to_virt((unsigned long) (phys))
+
+#define phys_to_pfn(p) ((pfn_t) ((p) >> PAGE_SHIFT))
+#define pfn_to_phys(pfn) ((phys_t) ((pfn) << PAGE_SHIFT))
+
+#define pfn_valid(pfn) ((pfn) < max_mapnr)
+#define virt_addr_valid(v) pfn_valid(phys_to_pfn(__pa(v)))
+
+#include <asm-generic/memory_model.h>
+#include <asm-generic/getorder.h>
+
+#endif /* __ASSEMBLY__ */
+
+#ifdef CONFIG_X86_32
+#define __HAVE_ARCH_GATE_AREA 1
+#endif
+
+#endif /* __UM_PAGE_H */
diff --git a/arch/um/include/asm/pgalloc.h b/arch/um/include/asm/pgalloc.h
new file mode 100644
index 0000000..bf90b2a
--- /dev/null
+++ b/arch/um/include/asm/pgalloc.h
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Copyright 2003 PathScale, Inc.
+ * Derived from include/asm-i386/pgalloc.h and include/asm-i386/pgtable.h
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_PGALLOC_H
+#define __UM_PGALLOC_H
+
+#include <linux/mm.h>
+
+#define pmd_populate_kernel(mm, pmd, pte) \
+ set_pmd(pmd, __pmd(_PAGE_TABLE + (unsigned long) __pa(pte)))
+
+#define pmd_populate(mm, pmd, pte) \
+ set_pmd(pmd, __pmd(_PAGE_TABLE + \
+ ((unsigned long long)page_to_pfn(pte) << \
+ (unsigned long long) PAGE_SHIFT)))
+#define pmd_pgtable(pmd) pmd_page(pmd)
+
+/*
+ * Allocate and free page tables.
+ */
+extern pgd_t *pgd_alloc(struct mm_struct *);
+extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
+
+extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
+extern pgtable_t pte_alloc_one(struct mm_struct *, unsigned long);
+
+static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
+{
+ free_page((unsigned long) pte);
+}
+
+static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
+{
+ pgtable_page_dtor(pte);
+ __free_page(pte);
+}
+
+#define __pte_free_tlb(tlb,pte, address) \
+do { \
+ pgtable_page_dtor(pte); \
+ tlb_remove_page((tlb),(pte)); \
+} while (0)
+
+#ifdef CONFIG_3_LEVEL_PGTABLES
+
+static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
+{
+ free_page((unsigned long)pmd);
+}
+
+#define __pmd_free_tlb(tlb,x, address) tlb_remove_page((tlb),virt_to_page(x))
+#endif
+
+#define check_pgt_cache() do { } while (0)
+
+#endif
+
diff --git a/arch/um/include/asm/pgtable-2level.h b/arch/um/include/asm/pgtable-2level.h
new file mode 100644
index 0000000..cfbe597
--- /dev/null
+++ b/arch/um/include/asm/pgtable-2level.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Copyright 2003 PathScale, Inc.
+ * Derived from include/asm-i386/pgtable.h
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_PGTABLE_2LEVEL_H
+#define __UM_PGTABLE_2LEVEL_H
+
+#include <asm-generic/pgtable-nopmd.h>
+
+/* PGDIR_SHIFT determines what a third-level page table entry can map */
+
+#define PGDIR_SHIFT 22
+#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
+#define PGDIR_MASK (~(PGDIR_SIZE-1))
+
+/*
+ * entries per page directory level: the i386 is two-level, so
+ * we don't really have any PMD directory physically.
+ */
+#define PTRS_PER_PTE 1024
+#define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)
+#define PTRS_PER_PGD 1024
+#define FIRST_USER_ADDRESS 0UL
+
+#define pte_ERROR(e) \
+ printk("%s:%d: bad pte %p(%08lx).\n", __FILE__, __LINE__, &(e), \
+ pte_val(e))
+#define pgd_ERROR(e) \
+ printk("%s:%d: bad pgd %p(%08lx).\n", __FILE__, __LINE__, &(e), \
+ pgd_val(e))
+
+static inline int pgd_newpage(pgd_t pgd) { return 0; }
+static inline void pgd_mkuptodate(pgd_t pgd) { }
+
+#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
+
+#define pte_pfn(x) phys_to_pfn(pte_val(x))
+#define pfn_pte(pfn, prot) __pte(pfn_to_phys(pfn) | pgprot_val(prot))
+#define pfn_pmd(pfn, prot) __pmd(pfn_to_phys(pfn) | pgprot_val(prot))
+
+#endif
diff --git a/arch/um/include/asm/pgtable-3level.h b/arch/um/include/asm/pgtable-3level.h
new file mode 100644
index 0000000..2b4274e
--- /dev/null
+++ b/arch/um/include/asm/pgtable-3level.h
@@ -0,0 +1,116 @@
+/*
+ * Copyright 2003 PathScale Inc
+ * Derived from include/asm-i386/pgtable.h
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_PGTABLE_3LEVEL_H
+#define __UM_PGTABLE_3LEVEL_H
+
+#include <asm-generic/pgtable-nopud.h>
+
+/* PGDIR_SHIFT determines what a third-level page table entry can map */
+
+#ifdef CONFIG_64BIT
+#define PGDIR_SHIFT 30
+#else
+#define PGDIR_SHIFT 31
+#endif
+#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
+#define PGDIR_MASK (~(PGDIR_SIZE-1))
+
+/* PMD_SHIFT determines the size of the area a second-level page table can
+ * map
+ */
+
+#define PMD_SHIFT 21
+#define PMD_SIZE (1UL << PMD_SHIFT)
+#define PMD_MASK (~(PMD_SIZE-1))
+
+/*
+ * entries per page directory level
+ */
+
+#define PTRS_PER_PTE 512
+#ifdef CONFIG_64BIT
+#define PTRS_PER_PMD 512
+#define PTRS_PER_PGD 512
+#else
+#define PTRS_PER_PMD 1024
+#define PTRS_PER_PGD 1024
+#endif
+
+#define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)
+#define FIRST_USER_ADDRESS 0UL
+
+#define pte_ERROR(e) \
+ printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), \
+ pte_val(e))
+#define pmd_ERROR(e) \
+ printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
+ pmd_val(e))
+#define pgd_ERROR(e) \
+ printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
+ pgd_val(e))
+
+#define pud_none(x) (!(pud_val(x) & ~_PAGE_NEWPAGE))
+#define pud_bad(x) ((pud_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
+#define pud_present(x) (pud_val(x) & _PAGE_PRESENT)
+#define pud_populate(mm, pud, pmd) \
+ set_pud(pud, __pud(_PAGE_TABLE + __pa(pmd)))
+
+#ifdef CONFIG_64BIT
+#define set_pud(pudptr, pudval) set_64bit((u64 *) (pudptr), pud_val(pudval))
+#else
+#define set_pud(pudptr, pudval) (*(pudptr) = (pudval))
+#endif
+
+static inline int pgd_newpage(pgd_t pgd)
+{
+ return(pgd_val(pgd) & _PAGE_NEWPAGE);
+}
+
+static inline void pgd_mkuptodate(pgd_t pgd) { pgd_val(pgd) &= ~_PAGE_NEWPAGE; }
+
+#ifdef CONFIG_64BIT
+#define set_pmd(pmdptr, pmdval) set_64bit((u64 *) (pmdptr), pmd_val(pmdval))
+#else
+#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
+#endif
+
+struct mm_struct;
+extern pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address);
+
+static inline void pud_clear (pud_t *pud)
+{
+ set_pud(pud, __pud(_PAGE_NEWPAGE));
+}
+
+#define pud_page(pud) phys_to_page(pud_val(pud) & PAGE_MASK)
+#define pud_page_vaddr(pud) ((unsigned long) __va(pud_val(pud) & PAGE_MASK))
+
+/* Find an entry in the second-level page table.. */
+#define pmd_offset(pud, address) ((pmd_t *) pud_page_vaddr(*(pud)) + \
+ pmd_index(address))
+
+static inline unsigned long pte_pfn(pte_t pte)
+{
+ return phys_to_pfn(pte_val(pte));
+}
+
+static inline pte_t pfn_pte(pfn_t page_nr, pgprot_t pgprot)
+{
+ pte_t pte;
+ phys_t phys = pfn_to_phys(page_nr);
+
+ pte_set_val(pte, phys, pgprot);
+ return pte;
+}
+
+static inline pmd_t pfn_pmd(pfn_t page_nr, pgprot_t pgprot)
+{
+ return __pmd((page_nr << PAGE_SHIFT) | pgprot_val(pgprot));
+}
+
+#endif
+
diff --git a/arch/um/include/asm/pgtable.h b/arch/um/include/asm/pgtable.h
new file mode 100644
index 0000000..18eb992
--- /dev/null
+++ b/arch/um/include/asm/pgtable.h
@@ -0,0 +1,362 @@
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Copyright 2003 PathScale, Inc.
+ * Derived from include/asm-i386/pgtable.h
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_PGTABLE_H
+#define __UM_PGTABLE_H
+
+#include <asm/fixmap.h>
+
+#define _PAGE_PRESENT 0x001
+#define _PAGE_NEWPAGE 0x002
+#define _PAGE_NEWPROT 0x004
+#define _PAGE_RW 0x020
+#define _PAGE_USER 0x040
+#define _PAGE_ACCESSED 0x080
+#define _PAGE_DIRTY 0x100
+/* If _PAGE_PRESENT is clear, we use these: */
+#define _PAGE_PROTNONE 0x010 /* if the user mapped it with PROT_NONE;
+ pte_present gives true */
+
+#ifdef CONFIG_3_LEVEL_PGTABLES
+#include <asm/pgtable-3level.h>
+#else
+#include <asm/pgtable-2level.h>
+#endif
+
+extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
+
+/* zero page used for uninitialized stuff */
+extern unsigned long *empty_zero_page;
+
+#define pgtable_cache_init() do ; while (0)
+
+/* Just any arbitrary offset to the start of the vmalloc VM area: the
+ * current 8MB value just means that there will be a 8MB "hole" after the
+ * physical memory until the kernel virtual memory starts. That means that
+ * any out-of-bounds memory accesses will hopefully be caught.
+ * The vmalloc() routines leaves a hole of 4kB between each vmalloced
+ * area for the same reason. ;)
+ */
+
+extern unsigned long end_iomem;
+
+#define VMALLOC_OFFSET (__va_space)
+#define VMALLOC_START ((end_iomem + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
+#define PKMAP_BASE ((FIXADDR_START - LAST_PKMAP * PAGE_SIZE) & PMD_MASK)
+#define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE)
+#define MODULES_VADDR VMALLOC_START
+#define MODULES_END VMALLOC_END
+#define MODULES_LEN (MODULES_VADDR - MODULES_END)
+
+#define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY)
+#define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)
+#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
+#define __PAGE_KERNEL_EXEC \
+ (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
+#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
+#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED)
+#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
+#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
+#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
+#define PAGE_KERNEL_EXEC __pgprot(__PAGE_KERNEL_EXEC)
+
+/*
+ * The i386 can't do page protection for execute, and considers that the same
+ * are read.
+ * Also, write permissions imply read permissions. This is the closest we can
+ * get..
+ */
+#define __P000 PAGE_NONE
+#define __P001 PAGE_READONLY
+#define __P010 PAGE_COPY
+#define __P011 PAGE_COPY
+#define __P100 PAGE_READONLY
+#define __P101 PAGE_READONLY
+#define __P110 PAGE_COPY
+#define __P111 PAGE_COPY
+
+#define __S000 PAGE_NONE
+#define __S001 PAGE_READONLY
+#define __S010 PAGE_SHARED
+#define __S011 PAGE_SHARED
+#define __S100 PAGE_READONLY
+#define __S101 PAGE_READONLY
+#define __S110 PAGE_SHARED
+#define __S111 PAGE_SHARED
+
+/*
+ * ZERO_PAGE is a global shared page that is always zero: used
+ * for zero-mapped memory areas etc..
+ */
+#define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page)
+
+#define pte_clear(mm,addr,xp) pte_set_val(*(xp), (phys_t) 0, __pgprot(_PAGE_NEWPAGE))
+
+#define pmd_none(x) (!((unsigned long)pmd_val(x) & ~_PAGE_NEWPAGE))
+#define pmd_bad(x) ((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
+
+#define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
+#define pmd_clear(xp) do { pmd_val(*(xp)) = _PAGE_NEWPAGE; } while (0)
+
+#define pmd_newpage(x) (pmd_val(x) & _PAGE_NEWPAGE)
+#define pmd_mkuptodate(x) (pmd_val(x) &= ~_PAGE_NEWPAGE)
+
+#define pud_newpage(x) (pud_val(x) & _PAGE_NEWPAGE)
+#define pud_mkuptodate(x) (pud_val(x) &= ~_PAGE_NEWPAGE)
+
+#define pmd_page(pmd) phys_to_page(pmd_val(pmd) & PAGE_MASK)
+
+#define pte_page(x) pfn_to_page(pte_pfn(x))
+
+#define pte_present(x) pte_get_bits(x, (_PAGE_PRESENT | _PAGE_PROTNONE))
+
+/*
+ * =================================
+ * Flags checking section.
+ * =================================
+ */
+
+static inline int pte_none(pte_t pte)
+{
+ return pte_is_zero(pte);
+}
+
+/*
+ * The following only work if pte_present() is true.
+ * Undefined behaviour if not..
+ */
+static inline int pte_read(pte_t pte)
+{
+ return((pte_get_bits(pte, _PAGE_USER)) &&
+ !(pte_get_bits(pte, _PAGE_PROTNONE)));
+}
+
+static inline int pte_exec(pte_t pte){
+ return((pte_get_bits(pte, _PAGE_USER)) &&
+ !(pte_get_bits(pte, _PAGE_PROTNONE)));
+}
+
+static inline int pte_write(pte_t pte)
+{
+ return((pte_get_bits(pte, _PAGE_RW)) &&
+ !(pte_get_bits(pte, _PAGE_PROTNONE)));
+}
+
+static inline int pte_dirty(pte_t pte)
+{
+ return pte_get_bits(pte, _PAGE_DIRTY);
+}
+
+static inline int pte_young(pte_t pte)
+{
+ return pte_get_bits(pte, _PAGE_ACCESSED);
+}
+
+static inline int pte_newpage(pte_t pte)
+{
+ return pte_get_bits(pte, _PAGE_NEWPAGE);
+}
+
+static inline int pte_newprot(pte_t pte)
+{
+ return(pte_present(pte) && (pte_get_bits(pte, _PAGE_NEWPROT)));
+}
+
+static inline int pte_special(pte_t pte)
+{
+ return 0;
+}
+
+/*
+ * =================================
+ * Flags setting section.
+ * =================================
+ */
+
+static inline pte_t pte_mknewprot(pte_t pte)
+{
+ pte_set_bits(pte, _PAGE_NEWPROT);
+ return(pte);
+}
+
+static inline pte_t pte_mkclean(pte_t pte)
+{
+ pte_clear_bits(pte, _PAGE_DIRTY);
+ return(pte);
+}
+
+static inline pte_t pte_mkold(pte_t pte)
+{
+ pte_clear_bits(pte, _PAGE_ACCESSED);
+ return(pte);
+}
+
+static inline pte_t pte_wrprotect(pte_t pte)
+{
+ pte_clear_bits(pte, _PAGE_RW);
+ return(pte_mknewprot(pte));
+}
+
+static inline pte_t pte_mkread(pte_t pte)
+{
+ pte_set_bits(pte, _PAGE_USER);
+ return(pte_mknewprot(pte));
+}
+
+static inline pte_t pte_mkdirty(pte_t pte)
+{
+ pte_set_bits(pte, _PAGE_DIRTY);
+ return(pte);
+}
+
+static inline pte_t pte_mkyoung(pte_t pte)
+{
+ pte_set_bits(pte, _PAGE_ACCESSED);
+ return(pte);
+}
+
+static inline pte_t pte_mkwrite(pte_t pte)
+{
+ pte_set_bits(pte, _PAGE_RW);
+ return(pte_mknewprot(pte));
+}
+
+static inline pte_t pte_mkuptodate(pte_t pte)
+{
+ pte_clear_bits(pte, _PAGE_NEWPAGE);
+ if(pte_present(pte))
+ pte_clear_bits(pte, _PAGE_NEWPROT);
+ return(pte);
+}
+
+static inline pte_t pte_mknewpage(pte_t pte)
+{
+ pte_set_bits(pte, _PAGE_NEWPAGE);
+ return(pte);
+}
+
+static inline pte_t pte_mkspecial(pte_t pte)
+{
+ return(pte);
+}
+
+static inline void set_pte(pte_t *pteptr, pte_t pteval)
+{
+ pte_copy(*pteptr, pteval);
+
+ /* If it's a swap entry, it needs to be marked _PAGE_NEWPAGE so
+ * fix_range knows to unmap it. _PAGE_NEWPROT is specific to
+ * mapped pages.
+ */
+
+ *pteptr = pte_mknewpage(*pteptr);
+ if(pte_present(*pteptr)) *pteptr = pte_mknewprot(*pteptr);
+}
+#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
+
+#define __HAVE_ARCH_PTE_SAME
+static inline int pte_same(pte_t pte_a, pte_t pte_b)
+{
+ return !((pte_val(pte_a) ^ pte_val(pte_b)) & ~_PAGE_NEWPAGE);
+}
+
+/*
+ * Conversion functions: convert a page and protection to a page entry,
+ * and a page entry and page directory to the page they refer to.
+ */
+
+#define phys_to_page(phys) pfn_to_page(phys_to_pfn(phys))
+#define __virt_to_page(virt) phys_to_page(__pa(virt))
+#define page_to_phys(page) pfn_to_phys((pfn_t) page_to_pfn(page))
+#define virt_to_page(addr) __virt_to_page((const unsigned long) addr)
+
+#define mk_pte(page, pgprot) \
+ ({ pte_t pte; \
+ \
+ pte_set_val(pte, page_to_phys(page), (pgprot)); \
+ if (pte_present(pte)) \
+ pte_mknewprot(pte_mknewpage(pte)); \
+ pte;})
+
+static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
+{
+ pte_set_val(pte, (pte_val(pte) & _PAGE_CHG_MASK), newprot);
+ return pte;
+}
+
+/*
+ * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
+ *
+ * this macro returns the index of the entry in the pgd page which would
+ * control the given virtual address
+ */
+#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
+
+/*
+ * pgd_offset() returns a (pgd_t *)
+ * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
+ */
+#define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address))
+
+/*
+ * a shortcut which implies the use of the kernel's pgd, instead
+ * of a process's
+ */
+#define pgd_offset_k(address) pgd_offset(&init_mm, address)
+
+/*
+ * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
+ *
+ * this macro returns the index of the entry in the pmd page which would
+ * control the given virtual address
+ */
+#define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
+#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
+
+#define pmd_page_vaddr(pmd) \
+ ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
+
+/*
+ * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
+ *
+ * this macro returns the index of the entry in the pte page which would
+ * control the given virtual address
+ */
+#define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
+#define pte_offset_kernel(dir, address) \
+ ((pte_t *) pmd_page_vaddr(*(dir)) + pte_index(address))
+#define pte_offset_map(dir, address) \
+ ((pte_t *)page_address(pmd_page(*(dir))) + pte_index(address))
+#define pte_unmap(pte) do { } while (0)
+
+struct mm_struct;
+extern pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr);
+
+#define update_mmu_cache(vma,address,ptep) do ; while (0)
+
+/* Encode and de-code a swap entry */
+#define __swp_type(x) (((x).val >> 5) & 0x1f)
+#define __swp_offset(x) ((x).val >> 11)
+
+#define __swp_entry(type, offset) \
+ ((swp_entry_t) { ((type) << 5) | ((offset) << 11) })
+#define __pte_to_swp_entry(pte) \
+ ((swp_entry_t) { pte_val(pte_mkuptodate(pte)) })
+#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
+
+#define kern_addr_valid(addr) (1)
+
+#include <asm-generic/pgtable.h>
+
+/* Clear a kernel PTE and flush it from the TLB */
+#define kpte_clear_flush(ptep, vaddr) \
+do { \
+ pte_clear(&init_mm, (vaddr), (ptep)); \
+ __flush_tlb_one((vaddr)); \
+} while (0)
+
+#endif
diff --git a/arch/um/include/asm/processor-generic.h b/arch/um/include/asm/processor-generic.h
new file mode 100644
index 0000000..2d1e0dd
--- /dev/null
+++ b/arch/um/include/asm/processor-generic.h
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_PROCESSOR_GENERIC_H
+#define __UM_PROCESSOR_GENERIC_H
+
+struct pt_regs;
+
+struct task_struct;
+
+#include <asm/ptrace.h>
+#include <registers.h>
+#include <sysdep/archsetjmp.h>
+
+#include <linux/prefetch.h>
+
+struct mm_struct;
+
+struct thread_struct {
+ struct pt_regs regs;
+ struct pt_regs *segv_regs;
+ int singlestep_syscall;
+ void *fault_addr;
+ jmp_buf *fault_catcher;
+ struct task_struct *prev_sched;
+ struct arch_thread arch;
+ jmp_buf switch_buf;
+ struct {
+ int op;
+ union {
+ struct {
+ int pid;
+ } fork, exec;
+ struct {
+ int (*proc)(void *);
+ void *arg;
+ } thread;
+ struct {
+ void (*proc)(void *);
+ void *arg;
+ } cb;
+ } u;
+ } request;
+};
+
+#define INIT_THREAD \
+{ \
+ .regs = EMPTY_REGS, \
+ .fault_addr = NULL, \
+ .prev_sched = NULL, \
+ .arch = INIT_ARCH_THREAD, \
+ .request = { 0 } \
+}
+
+static inline void release_thread(struct task_struct *task)
+{
+}
+
+extern unsigned long thread_saved_pc(struct task_struct *t);
+
+static inline void mm_copy_segments(struct mm_struct *from_mm,
+ struct mm_struct *new_mm)
+{
+}
+
+#define init_stack (init_thread_union.stack)
+
+/*
+ * User space process size: 3GB (default).
+ */
+extern unsigned long task_size;
+
+#define TASK_SIZE (task_size)
+
+#undef STACK_TOP
+#undef STACK_TOP_MAX
+
+extern unsigned long stacksizelim;
+
+#define STACK_ROOM (stacksizelim)
+#define STACK_TOP (TASK_SIZE - 2 * PAGE_SIZE)
+#define STACK_TOP_MAX STACK_TOP
+
+/* This decides where the kernel will search for a free chunk of vm
+ * space during mmap's.
+ */
+#define TASK_UNMAPPED_BASE (0x40000000)
+
+extern void start_thread(struct pt_regs *regs, unsigned long entry,
+ unsigned long stack);
+
+struct cpuinfo_um {
+ unsigned long loops_per_jiffy;
+ int ipi_pipe[2];
+};
+
+extern struct cpuinfo_um boot_cpu_data;
+
+#define cpu_data (&boot_cpu_data)
+#define current_cpu_data boot_cpu_data
+
+#define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf)
+extern unsigned long get_wchan(struct task_struct *p);
+
+#endif
diff --git a/arch/um/include/asm/ptrace-generic.h b/arch/um/include/asm/ptrace-generic.h
new file mode 100644
index 0000000..5ab2062
--- /dev/null
+++ b/arch/um/include/asm/ptrace-generic.h
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_PTRACE_GENERIC_H
+#define __UM_PTRACE_GENERIC_H
+
+#ifndef __ASSEMBLY__
+
+#include <sysdep/ptrace.h>
+
+struct pt_regs {
+ struct uml_pt_regs regs;
+};
+
+#define arch_has_single_step() (1)
+
+#define EMPTY_REGS { .regs = EMPTY_UML_PT_REGS }
+
+#define PT_REGS_IP(r) UPT_IP(&(r)->regs)
+#define PT_REGS_SP(r) UPT_SP(&(r)->regs)
+
+#define PT_REGS_RESTART_SYSCALL(r) UPT_RESTART_SYSCALL(&(r)->regs)
+
+#define PT_REGS_SYSCALL_NR(r) UPT_SYSCALL_NR(&(r)->regs)
+
+#define instruction_pointer(regs) PT_REGS_IP(regs)
+
+#define PTRACE_OLDSETOPTIONS 21
+
+struct task_struct;
+
+extern long subarch_ptrace(struct task_struct *child, long request,
+ unsigned long addr, unsigned long data);
+extern unsigned long getreg(struct task_struct *child, int regno);
+extern int putreg(struct task_struct *child, int regno, unsigned long value);
+
+extern int arch_copy_tls(struct task_struct *new);
+extern void clear_flushed_tls(struct task_struct *task);
+extern int syscall_trace_enter(struct pt_regs *regs);
+extern void syscall_trace_leave(struct pt_regs *regs);
+
+#endif
+
+#endif
diff --git a/arch/um/include/asm/sections.h b/arch/um/include/asm/sections.h
new file mode 100644
index 0000000..cafcf68
--- /dev/null
+++ b/arch/um/include/asm/sections.h
@@ -0,0 +1,9 @@
+#ifndef __UM_SECTIONS_H
+#define __UM_SECTIONS_H
+
+#include <asm-generic/sections.h>
+
+extern char __binary_start[];
+extern char __syscall_stub_start[], __syscall_stub_end[];
+
+#endif
diff --git a/arch/um/include/asm/setup.h b/arch/um/include/asm/setup.h
new file mode 100644
index 0000000..99f0863
--- /dev/null
+++ b/arch/um/include/asm/setup.h
@@ -0,0 +1,10 @@
+#ifndef SETUP_H_INCLUDED
+#define SETUP_H_INCLUDED
+
+/* POSIX mandated with _POSIX_ARG_MAX that we can rely on 4096 chars in the
+ * command line, so this choice is ok.
+ */
+
+#define COMMAND_LINE_SIZE 4096
+
+#endif /* SETUP_H_INCLUDED */
diff --git a/arch/um/include/asm/smp.h b/arch/um/include/asm/smp.h
new file mode 100644
index 0000000..9c3be35
--- /dev/null
+++ b/arch/um/include/asm/smp.h
@@ -0,0 +1,6 @@
+#ifndef __UM_SMP_H
+#define __UM_SMP_H
+
+#define hard_smp_processor_id() 0
+
+#endif
diff --git a/arch/um/include/asm/stacktrace.h b/arch/um/include/asm/stacktrace.h
new file mode 100644
index 0000000..9a86432
--- /dev/null
+++ b/arch/um/include/asm/stacktrace.h
@@ -0,0 +1,42 @@
+#ifndef _ASM_UML_STACKTRACE_H
+#define _ASM_UML_STACKTRACE_H
+
+#include <linux/uaccess.h>
+#include <linux/ptrace.h>
+
+struct stack_frame {
+ struct stack_frame *next_frame;
+ unsigned long return_address;
+};
+
+struct stacktrace_ops {
+ void (*address)(void *data, unsigned long address, int reliable);
+};
+
+#ifdef CONFIG_FRAME_POINTER
+static inline unsigned long
+get_frame_pointer(struct task_struct *task, struct pt_regs *segv_regs)
+{
+ if (!task || task == current)
+ return segv_regs ? PT_REGS_BP(segv_regs) : current_bp();
+ return KSTK_EBP(task);
+}
+#else
+static inline unsigned long
+get_frame_pointer(struct task_struct *task, struct pt_regs *segv_regs)
+{
+ return 0;
+}
+#endif
+
+static inline unsigned long
+*get_stack_pointer(struct task_struct *task, struct pt_regs *segv_regs)
+{
+ if (!task || task == current)
+ return segv_regs ? (unsigned long *)PT_REGS_SP(segv_regs) : current_sp();
+ return (unsigned long *)KSTK_ESP(task);
+}
+
+void dump_trace(struct task_struct *tsk, const struct stacktrace_ops *ops, void *data);
+
+#endif /* _ASM_UML_STACKTRACE_H */
diff --git a/arch/um/include/asm/sysrq.h b/arch/um/include/asm/sysrq.h
new file mode 100644
index 0000000..c8d332b
--- /dev/null
+++ b/arch/um/include/asm/sysrq.h
@@ -0,0 +1,7 @@
+#ifndef __UM_SYSRQ_H
+#define __UM_SYSRQ_H
+
+struct task_struct;
+extern void show_trace(struct task_struct* task, unsigned long *stack);
+
+#endif
diff --git a/arch/um/include/asm/thread_info.h b/arch/um/include/asm/thread_info.h
new file mode 100644
index 0000000..53968aa
--- /dev/null
+++ b/arch/um/include/asm/thread_info.h
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_THREAD_INFO_H
+#define __UM_THREAD_INFO_H
+
+#ifndef __ASSEMBLY__
+
+#include <asm/types.h>
+#include <asm/page.h>
+#include <asm/segment.h>
+
+struct thread_info {
+ struct task_struct *task; /* main task structure */
+ unsigned long flags; /* low level flags */
+ __u32 cpu; /* current CPU */
+ int preempt_count; /* 0 => preemptable,
+ <0 => BUG */
+ mm_segment_t addr_limit; /* thread address space:
+ 0-0xBFFFFFFF for user
+ 0-0xFFFFFFFF for kernel */
+ struct thread_info *real_thread; /* Points to non-IRQ stack */
+};
+
+#define INIT_THREAD_INFO(tsk) \
+{ \
+ .task = &tsk, \
+ .flags = 0, \
+ .cpu = 0, \
+ .preempt_count = INIT_PREEMPT_COUNT, \
+ .addr_limit = KERNEL_DS, \
+ .real_thread = NULL, \
+}
+
+#define init_thread_info (init_thread_union.thread_info)
+#define init_stack (init_thread_union.stack)
+
+#define THREAD_SIZE ((1 << CONFIG_KERNEL_STACK_ORDER) * PAGE_SIZE)
+/* how to get the thread information struct from C */
+static inline struct thread_info *current_thread_info(void)
+{
+ struct thread_info *ti;
+ unsigned long mask = THREAD_SIZE - 1;
+ void *p;
+
+ asm volatile ("" : "=r" (p) : "0" (&ti));
+ ti = (struct thread_info *) (((unsigned long)p) & ~mask);
+ return ti;
+}
+
+#define THREAD_SIZE_ORDER CONFIG_KERNEL_STACK_ORDER
+
+#endif
+
+#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
+#define TIF_SIGPENDING 1 /* signal pending */
+#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
+#define TIF_RESTART_BLOCK 4
+#define TIF_MEMDIE 5 /* is terminating due to OOM killer */
+#define TIF_SYSCALL_AUDIT 6
+#define TIF_RESTORE_SIGMASK 7
+#define TIF_NOTIFY_RESUME 8
+
+#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
+#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
+#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
+#define _TIF_MEMDIE (1 << TIF_MEMDIE)
+#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
+
+#endif
diff --git a/arch/um/include/asm/timex.h b/arch/um/include/asm/timex.h
new file mode 100644
index 0000000..0f4ada0
--- /dev/null
+++ b/arch/um/include/asm/timex.h
@@ -0,0 +1,13 @@
+#ifndef __UM_TIMEX_H
+#define __UM_TIMEX_H
+
+typedef unsigned long cycles_t;
+
+static inline cycles_t get_cycles (void)
+{
+ return 0;
+}
+
+#define CLOCK_TICK_RATE (HZ)
+
+#endif
diff --git a/arch/um/include/asm/tlb.h b/arch/um/include/asm/tlb.h
new file mode 100644
index 0000000..16eb63f
--- /dev/null
+++ b/arch/um/include/asm/tlb.h
@@ -0,0 +1,134 @@
+#ifndef __UM_TLB_H
+#define __UM_TLB_H
+
+#include <linux/pagemap.h>
+#include <linux/swap.h>
+#include <asm/percpu.h>
+#include <asm/pgalloc.h>
+#include <asm/tlbflush.h>
+
+#define tlb_start_vma(tlb, vma) do { } while (0)
+#define tlb_end_vma(tlb, vma) do { } while (0)
+#define tlb_flush(tlb) flush_tlb_mm((tlb)->mm)
+
+/* struct mmu_gather is an opaque type used by the mm code for passing around
+ * any data needed by arch specific code for tlb_remove_page.
+ */
+struct mmu_gather {
+ struct mm_struct *mm;
+ unsigned int need_flush; /* Really unmapped some ptes? */
+ unsigned long start;
+ unsigned long end;
+ unsigned int fullmm; /* non-zero means full mm flush */
+};
+
+static inline void __tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep,
+ unsigned long address)
+{
+ if (tlb->start > address)
+ tlb->start = address;
+ if (tlb->end < address + PAGE_SIZE)
+ tlb->end = address + PAGE_SIZE;
+}
+
+static inline void init_tlb_gather(struct mmu_gather *tlb)
+{
+ tlb->need_flush = 0;
+
+ tlb->start = TASK_SIZE;
+ tlb->end = 0;
+
+ if (tlb->fullmm) {
+ tlb->start = 0;
+ tlb->end = TASK_SIZE;
+ }
+}
+
+static inline void
+tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, unsigned long start, unsigned long end)
+{
+ tlb->mm = mm;
+ tlb->start = start;
+ tlb->end = end;
+ tlb->fullmm = !(start | (end+1));
+
+ init_tlb_gather(tlb);
+}
+
+extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
+ unsigned long end);
+
+static inline void
+tlb_flush_mmu_tlbonly(struct mmu_gather *tlb)
+{
+ flush_tlb_mm_range(tlb->mm, tlb->start, tlb->end);
+}
+
+static inline void
+tlb_flush_mmu_free(struct mmu_gather *tlb)
+{
+ init_tlb_gather(tlb);
+}
+
+static inline void
+tlb_flush_mmu(struct mmu_gather *tlb)
+{
+ if (!tlb->need_flush)
+ return;
+
+ tlb_flush_mmu_tlbonly(tlb);
+ tlb_flush_mmu_free(tlb);
+}
+
+/* tlb_finish_mmu
+ * Called at the end of the shootdown operation to free up any resources
+ * that were required.
+ */
+static inline void
+tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
+{
+ tlb_flush_mmu(tlb);
+
+ /* keep the page table cache within bounds */
+ check_pgt_cache();
+}
+
+/* tlb_remove_page
+ * Must perform the equivalent to __free_pte(pte_get_and_clear(ptep)),
+ * while handling the additional races in SMP caused by other CPUs
+ * caching valid mappings in their TLBs.
+ */
+static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
+{
+ tlb->need_flush = 1;
+ free_page_and_swap_cache(page);
+ return 1; /* avoid calling tlb_flush_mmu */
+}
+
+static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
+{
+ __tlb_remove_page(tlb, page);
+}
+
+/**
+ * tlb_remove_tlb_entry - remember a pte unmapping for later tlb invalidation.
+ *
+ * Record the fact that pte's were really umapped in ->need_flush, so we can
+ * later optimise away the tlb invalidate. This helps when userspace is
+ * unmapping already-unmapped pages, which happens quite a lot.
+ */
+#define tlb_remove_tlb_entry(tlb, ptep, address) \
+ do { \
+ tlb->need_flush = 1; \
+ __tlb_remove_tlb_entry(tlb, ptep, address); \
+ } while (0)
+
+#define pte_free_tlb(tlb, ptep, addr) __pte_free_tlb(tlb, ptep, addr)
+
+#define pud_free_tlb(tlb, pudp, addr) __pud_free_tlb(tlb, pudp, addr)
+
+#define pmd_free_tlb(tlb, pmdp, addr) __pmd_free_tlb(tlb, pmdp, addr)
+
+#define tlb_migrate_finish(mm) do {} while (0)
+
+#endif
diff --git a/arch/um/include/asm/tlbflush.h b/arch/um/include/asm/tlbflush.h
new file mode 100644
index 0000000..614f2c0
--- /dev/null
+++ b/arch/um/include/asm/tlbflush.h
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_TLBFLUSH_H
+#define __UM_TLBFLUSH_H
+
+#include <linux/mm.h>
+
+/*
+ * TLB flushing:
+ *
+ * - flush_tlb() flushes the current mm struct TLBs
+ * - flush_tlb_all() flushes all processes TLBs
+ * - flush_tlb_mm(mm) flushes the specified mm context TLB's
+ * - flush_tlb_page(vma, vmaddr) flushes one page
+ * - flush_tlb_kernel_vm() flushes the kernel vm area
+ * - flush_tlb_range(vma, start, end) flushes a range of pages
+ */
+
+extern void flush_tlb_all(void);
+extern void flush_tlb_mm(struct mm_struct *mm);
+extern void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
+ unsigned long end);
+extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long address);
+extern void flush_tlb_kernel_vm(void);
+extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
+extern void __flush_tlb_one(unsigned long addr);
+
+#endif
diff --git a/arch/um/include/asm/uaccess.h b/arch/um/include/asm/uaccess.h
new file mode 100644
index 0000000..3705620
--- /dev/null
+++ b/arch/um/include/asm/uaccess.h
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Copyright (C) 2015 Richard Weinberger (richard@nod.at)
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_UACCESS_H
+#define __UM_UACCESS_H
+
+#include <asm/thread_info.h>
+#include <asm/elf.h>
+
+#define __under_task_size(addr, size) \
+ (((unsigned long) (addr) < TASK_SIZE) && \
+ (((unsigned long) (addr) + (size)) < TASK_SIZE))
+
+#define __access_ok_vsyscall(addr, size) \
+ (((unsigned long) (addr) >= FIXADDR_USER_START) && \
+ ((unsigned long) (addr) + (size) <= FIXADDR_USER_END) && \
+ ((unsigned long) (addr) + (size) >= (unsigned long)(addr)))
+
+#define __addr_range_nowrap(addr, size) \
+ ((unsigned long) (addr) <= ((unsigned long) (addr) + (size)))
+
+extern long __copy_from_user(void *to, const void __user *from, unsigned long n);
+extern long __copy_to_user(void __user *to, const void *from, unsigned long n);
+extern long __strncpy_from_user(char *dst, const char __user *src, long count);
+extern long __strnlen_user(const void __user *str, long len);
+extern unsigned long __clear_user(void __user *mem, unsigned long len);
+static inline int __access_ok(unsigned long addr, unsigned long size);
+
+/* Teach asm-generic/uaccess.h that we have C functions for these. */
+#define __access_ok __access_ok
+#define __clear_user __clear_user
+#define __copy_to_user __copy_to_user
+#define __copy_from_user __copy_from_user
+#define __strnlen_user __strnlen_user
+#define __strncpy_from_user __strncpy_from_user
+#define __copy_to_user_inatomic __copy_to_user
+#define __copy_from_user_inatomic __copy_from_user
+
+#include <asm-generic/uaccess.h>
+
+static inline int __access_ok(unsigned long addr, unsigned long size)
+{
+ return __addr_range_nowrap(addr, size) &&
+ (__under_task_size(addr, size) ||
+ __access_ok_vsyscall(addr, size) ||
+ segment_eq(get_fs(), KERNEL_DS));
+}
+
+#endif
diff --git a/arch/um/include/shared/aio.h b/arch/um/include/shared/aio.h
new file mode 100644
index 0000000..423bae9
--- /dev/null
+++ b/arch/um/include/shared/aio.h
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2004 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef AIO_H__
+#define AIO_H__
+
+enum aio_type { AIO_READ, AIO_WRITE, AIO_MMAP };
+
+struct aio_thread_reply {
+ void *data;
+ int err;
+};
+
+struct aio_context {
+ int reply_fd;
+ struct aio_context *next;
+};
+
+#define INIT_AIO_CONTEXT { .reply_fd = -1, \
+ .next = NULL }
+
+extern int submit_aio(enum aio_type type, int fd, char *buf, int len,
+ unsigned long long offset, int reply_fd,
+ struct aio_context *aio);
+
+#endif
diff --git a/arch/um/include/shared/arch.h b/arch/um/include/shared/arch.h
new file mode 100644
index 0000000..4f46abd
--- /dev/null
+++ b/arch/um/include/shared/arch.h
@@ -0,0 +1,15 @@
+/*
+ * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __ARCH_H__
+#define __ARCH_H__
+
+#include <sysdep/ptrace.h>
+
+extern void arch_check_bugs(void);
+extern int arch_fixup(unsigned long address, struct uml_pt_regs *regs);
+extern void arch_examine_signal(int sig, struct uml_pt_regs *regs);
+
+#endif
diff --git a/arch/um/include/shared/as-layout.h b/arch/um/include/shared/as-layout.h
new file mode 100644
index 0000000..ca1843e
--- /dev/null
+++ b/arch/um/include/shared/as-layout.h
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __START_H__
+#define __START_H__
+
+#include <generated/asm-offsets.h>
+
+/*
+ * Stolen from linux/const.h, which can't be directly included since
+ * this is used in userspace code, which has no access to the kernel
+ * headers. Changed to be suitable for adding casts to the start,
+ * rather than "UL" to the end.
+ */
+
+/* Some constant macros are used in both assembler and
+ * C code. Therefore we cannot annotate them always with
+ * 'UL' and other type specifiers unilaterally. We
+ * use the following macros to deal with this.
+ */
+
+#ifdef __ASSEMBLY__
+#define _UML_AC(X, Y) (Y)
+#else
+#define __UML_AC(X, Y) (X(Y))
+#define _UML_AC(X, Y) __UML_AC(X, Y)
+#endif
+
+#define STUB_START _UML_AC(, 0x100000)
+#define STUB_CODE _UML_AC((unsigned long), STUB_START)
+#define STUB_DATA _UML_AC((unsigned long), STUB_CODE + UM_KERN_PAGE_SIZE)
+#define STUB_END _UML_AC((unsigned long), STUB_DATA + UM_KERN_PAGE_SIZE)
+
+#ifndef __ASSEMBLY__
+
+#include <sysdep/ptrace.h>
+
+struct cpu_task {
+ int pid;
+ void *task;
+};
+
+extern struct cpu_task cpu_tasks[];
+
+extern unsigned long high_physmem;
+extern unsigned long uml_physmem;
+extern unsigned long uml_reserved;
+extern unsigned long end_vm;
+extern unsigned long start_vm;
+extern unsigned long long highmem;
+
+extern unsigned long brk_start;
+
+extern unsigned long host_task_size;
+
+extern int linux_main(int argc, char **argv);
+extern void uml_finishsetup(void);
+
+struct siginfo;
+extern void (*sig_info[])(int, struct siginfo *si, struct uml_pt_regs *);
+
+#endif
+
+#endif
diff --git a/arch/um/include/shared/common-offsets.h b/arch/um/include/shared/common-offsets.h
new file mode 100644
index 0000000..c923068
--- /dev/null
+++ b/arch/um/include/shared/common-offsets.h
@@ -0,0 +1,41 @@
+/* for use by sys-$SUBARCH/kernel-offsets.c */
+
+DEFINE(KERNEL_MADV_REMOVE, MADV_REMOVE);
+
+DEFINE(UM_KERN_PAGE_SIZE, PAGE_SIZE);
+DEFINE(UM_KERN_PAGE_MASK, PAGE_MASK);
+DEFINE(UM_KERN_PAGE_SHIFT, PAGE_SHIFT);
+DEFINE(UM_NSEC_PER_SEC, NSEC_PER_SEC);
+
+DEFINE(UM_ELF_CLASS, ELF_CLASS);
+DEFINE(UM_ELFCLASS32, ELFCLASS32);
+DEFINE(UM_ELFCLASS64, ELFCLASS64);
+
+DEFINE(UM_NR_CPUS, NR_CPUS);
+
+DEFINE(UM_GFP_KERNEL, GFP_KERNEL);
+DEFINE(UM_GFP_ATOMIC, GFP_ATOMIC);
+
+/* For crypto assembler code. */
+DEFINE(crypto_tfm_ctx_offset, offsetof(struct crypto_tfm, __crt_ctx));
+
+DEFINE(UM_THREAD_SIZE, THREAD_SIZE);
+
+DEFINE(UM_HZ, HZ);
+
+DEFINE(UM_USEC_PER_SEC, USEC_PER_SEC);
+DEFINE(UM_NSEC_PER_SEC, NSEC_PER_SEC);
+DEFINE(UM_NSEC_PER_USEC, NSEC_PER_USEC);
+
+#ifdef CONFIG_PRINTK
+DEFINE(UML_CONFIG_PRINTK, CONFIG_PRINTK);
+#endif
+#ifdef CONFIG_NO_HZ_COMMON
+DEFINE(UML_CONFIG_NO_HZ_COMMON, CONFIG_NO_HZ_COMMON);
+#endif
+#ifdef CONFIG_UML_X86
+DEFINE(UML_CONFIG_UML_X86, CONFIG_UML_X86);
+#endif
+#ifdef CONFIG_64BIT
+DEFINE(UML_CONFIG_64BIT, CONFIG_64BIT);
+#endif
diff --git a/arch/um/include/shared/elf_user.h b/arch/um/include/shared/elf_user.h
new file mode 100644
index 0000000..53516b6
--- /dev/null
+++ b/arch/um/include/shared/elf_user.h
@@ -0,0 +1,19 @@
+/*
+ * Copyright (C) 2004 Fujitsu Siemens Computers GmbH
+ * Author: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
+ * Licensed under the GPL
+ */
+
+#ifndef __ELF_USER_H__
+#define __ELF_USER_H__
+
+/* For compilation on a host that doesn't support AT_SYSINFO (Linux 2.4) */
+
+#ifndef AT_SYSINFO
+#define AT_SYSINFO 32
+#endif
+#ifndef AT_SYSINFO_EHDR
+#define AT_SYSINFO_EHDR 33
+#endif
+
+#endif
diff --git a/arch/um/include/shared/frame_kern.h b/arch/um/include/shared/frame_kern.h
new file mode 100644
index 0000000..a5cde5c
--- /dev/null
+++ b/arch/um/include/shared/frame_kern.h
@@ -0,0 +1,15 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __FRAME_KERN_H_
+#define __FRAME_KERN_H_
+
+extern int setup_signal_stack_sc(unsigned long stack_top, struct ksignal *ksig,
+ struct pt_regs *regs, sigset_t *mask);
+extern int setup_signal_stack_si(unsigned long stack_top, struct ksignal *ksig,
+ struct pt_regs *regs, sigset_t *mask);
+
+#endif
+
diff --git a/arch/um/include/shared/init.h b/arch/um/include/shared/init.h
new file mode 100644
index 0000000..233e259
--- /dev/null
+++ b/arch/um/include/shared/init.h
@@ -0,0 +1,131 @@
+#ifndef _LINUX_UML_INIT_H
+#define _LINUX_UML_INIT_H
+
+/* These macros are used to mark some functions or
+ * initialized data (doesn't apply to uninitialized data)
+ * as `initialization' functions. The kernel can take this
+ * as hint that the function is used only during the initialization
+ * phase and free up used memory resources after
+ *
+ * Usage:
+ * For functions:
+ *
+ * You should add __init immediately before the function name, like:
+ *
+ * static void __init initme(int x, int y)
+ * {
+ * extern int z; z = x * y;
+ * }
+ *
+ * If the function has a prototype somewhere, you can also add
+ * __init between closing brace of the prototype and semicolon:
+ *
+ * extern int initialize_foobar_device(int, int, int) __init;
+ *
+ * For initialized data:
+ * You should insert __initdata between the variable name and equal
+ * sign followed by value, e.g.:
+ *
+ * static int init_variable __initdata = 0;
+ * static const char linux_logo[] __initconst = { 0x32, 0x36, ... };
+ *
+ * Don't forget to initialize data not at file scope, i.e. within a function,
+ * as gcc otherwise puts the data into the bss section and not into the init
+ * section.
+ *
+ * Also note, that this data cannot be "const".
+ */
+
+#ifndef _LINUX_INIT_H
+typedef int (*initcall_t)(void);
+typedef void (*exitcall_t)(void);
+
+#include <linux/compiler.h>
+
+/* These are for everybody (although not all archs will actually
+ discard it in modules) */
+#define __init __section(.init.text)
+#define __initdata __section(.init.data)
+#define __exitdata __section(.exit.data)
+#define __exit_call __used __section(.exitcall.exit)
+
+#ifdef MODULE
+#define __exit __section(.exit.text)
+#else
+#define __exit __used __section(.exit.text)
+#endif
+
+#endif
+
+#ifndef MODULE
+struct uml_param {
+ const char *str;
+ int (*setup_func)(char *, int *);
+};
+
+extern initcall_t __uml_initcall_start, __uml_initcall_end;
+extern initcall_t __uml_postsetup_start, __uml_postsetup_end;
+extern const char *__uml_help_start, *__uml_help_end;
+#endif
+
+#define __uml_initcall(fn) \
+ static initcall_t __uml_initcall_##fn __uml_init_call = fn
+
+#define __uml_exitcall(fn) \
+ static exitcall_t __uml_exitcall_##fn __uml_exit_call = fn
+
+extern struct uml_param __uml_setup_start, __uml_setup_end;
+
+#define __uml_postsetup(fn) \
+ static initcall_t __uml_postsetup_##fn __uml_postsetup_call = fn
+
+#define __non_empty_string(dummyname,string) \
+ struct __uml_non_empty_string_struct_##dummyname \
+ { \
+ char _string[sizeof(string)-2]; \
+ }
+
+#ifndef MODULE
+#define __uml_setup(str, fn, help...) \
+ __non_empty_string(fn ##_setup, str); \
+ __uml_help(fn, help); \
+ static char __uml_setup_str_##fn[] __initdata = str; \
+ static struct uml_param __uml_setup_##fn __uml_init_setup = { __uml_setup_str_##fn, fn }
+#else
+#define __uml_setup(str, fn, help...) \
+
+#endif
+
+#define __uml_help(fn, help...) \
+ __non_empty_string(fn ##__help, help); \
+ static char __uml_help_str_##fn[] __initdata = help; \
+ static const char *__uml_help_##fn __uml_setup_help = __uml_help_str_##fn
+
+/*
+ * Mark functions and data as being only used at initialization
+ * or exit time.
+ */
+#define __uml_init_setup __used __section(.uml.setup.init)
+#define __uml_setup_help __used __section(.uml.help.init)
+#define __uml_init_call __used __section(.uml.initcall.init)
+#define __uml_postsetup_call __used __section(.uml.postsetup.init)
+#define __uml_exit_call __used __section(.uml.exitcall.exit)
+
+#ifdef __UM_HOST__
+
+#define __define_initcall(level,fn) \
+ static initcall_t __initcall_##fn __used \
+ __attribute__((__section__(".initcall" level ".init"))) = fn
+
+/* Userspace initcalls shouldn't depend on anything in the kernel, so we'll
+ * make them run first.
+ */
+#define __initcall(fn) __define_initcall("1", fn)
+
+#define __exitcall(fn) static exitcall_t __exitcall_##fn __exit_call = fn
+
+#define __init_call __used __section(.initcall.init)
+
+#endif
+
+#endif /* _LINUX_UML_INIT_H */
diff --git a/arch/um/include/shared/irq_kern.h b/arch/um/include/shared/irq_kern.h
new file mode 100644
index 0000000..e05bd66
--- /dev/null
+++ b/arch/um/include/shared/irq_kern.h
@@ -0,0 +1,18 @@
+/*
+ * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __IRQ_KERN_H__
+#define __IRQ_KERN_H__
+
+#include <linux/interrupt.h>
+#include <asm/ptrace.h>
+
+extern int um_request_irq(unsigned int irq, int fd, int type,
+ irq_handler_t handler,
+ unsigned long irqflags, const char * devname,
+ void *dev_id);
+void um_free_irq(unsigned int irq, void *dev);
+#endif
+
diff --git a/arch/um/include/shared/irq_user.h b/arch/um/include/shared/irq_user.h
new file mode 100644
index 0000000..df56330
--- /dev/null
+++ b/arch/um/include/shared/irq_user.h
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __IRQ_USER_H__
+#define __IRQ_USER_H__
+
+#include <sysdep/ptrace.h>
+
+struct irq_fd {
+ struct irq_fd *next;
+ void *id;
+ int fd;
+ int type;
+ int irq;
+ int events;
+ int current_events;
+};
+
+enum { IRQ_READ, IRQ_WRITE };
+
+struct siginfo;
+extern void sigio_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs);
+extern void free_irq_by_fd(int fd);
+extern void reactivate_fd(int fd, int irqnum);
+extern void deactivate_fd(int fd, int irqnum);
+extern int deactivate_all_fds(void);
+extern int activate_ipi(int fd, int pid);
+
+#endif
diff --git a/arch/um/include/shared/kern.h b/arch/um/include/shared/kern.h
new file mode 100644
index 0000000..6cd0124
--- /dev/null
+++ b/arch/um/include/shared/kern.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __KERN_H__
+#define __KERN_H__
+
+/* These are all user-mode things which are convenient to call directly
+ * from kernel code and for which writing a wrapper is too much of a pain.
+ * The regular include files can't be included because this file is included
+ * only into kernel code, and user-space includes conflict with kernel
+ * includes.
+ */
+
+extern int printf(const char *fmt, ...);
+extern void *sbrk(int increment);
+extern int pause(void);
+extern void exit(int);
+
+#endif
+
diff --git a/arch/um/include/shared/kern_util.h b/arch/um/include/shared/kern_util.h
new file mode 100644
index 0000000..35ab97e
--- /dev/null
+++ b/arch/um/include/shared/kern_util.h
@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __KERN_UTIL_H__
+#define __KERN_UTIL_H__
+
+#include <sysdep/ptrace.h>
+#include <sysdep/faultinfo.h>
+
+struct siginfo;
+
+extern int uml_exitcode;
+
+extern int ncpus;
+extern int kmalloc_ok;
+
+#define UML_ROUND_UP(addr) \
+ ((((unsigned long) addr) + PAGE_SIZE - 1) & PAGE_MASK)
+
+extern unsigned long alloc_stack(int order, int atomic);
+extern void free_stack(unsigned long stack, int order);
+
+struct pt_regs;
+extern void do_signal(struct pt_regs *regs);
+extern void interrupt_end(void);
+extern void relay_signal(int sig, struct siginfo *si, struct uml_pt_regs *regs);
+
+extern unsigned long segv(struct faultinfo fi, unsigned long ip,
+ int is_user, struct uml_pt_regs *regs);
+extern int handle_page_fault(unsigned long address, unsigned long ip,
+ int is_write, int is_user, int *code_out);
+
+extern unsigned int do_IRQ(int irq, struct uml_pt_regs *regs);
+extern int smp_sigio_handler(void);
+extern void initial_thread_cb(void (*proc)(void *), void *arg);
+extern int is_syscall(unsigned long addr);
+
+extern void timer_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs);
+
+extern int start_uml(void);
+extern void paging_init(void);
+
+extern void uml_cleanup(void);
+extern void do_uml_exitcalls(void);
+
+/*
+ * Are we disallowed to sleep? Used to choose between GFP_KERNEL and
+ * GFP_ATOMIC.
+ */
+extern int __cant_sleep(void);
+extern int get_current_pid(void);
+extern int copy_from_user_proc(void *to, void *from, int size);
+extern int cpu(void);
+extern char *uml_strdup(const char *string);
+
+extern unsigned long to_irq_stack(unsigned long *mask_out);
+extern unsigned long from_irq_stack(int nested);
+
+extern void syscall_trace(struct uml_pt_regs *regs, int entryexit);
+extern int singlestepping(void *t);
+
+extern void segv_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs);
+extern void bus_handler(int sig, struct siginfo *si, struct uml_pt_regs *regs);
+extern void winch(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs);
+extern void fatal_sigsegv(void) __attribute__ ((noreturn));
+
+
+#endif
diff --git a/arch/um/include/shared/longjmp.h b/arch/um/include/shared/longjmp.h
new file mode 100644
index 0000000..9bdddf4
--- /dev/null
+++ b/arch/um/include/shared/longjmp.h
@@ -0,0 +1,23 @@
+#ifndef __UML_LONGJMP_H
+#define __UML_LONGJMP_H
+
+#include <sysdep/archsetjmp.h>
+#include <os.h>
+
+extern int setjmp(jmp_buf);
+extern void longjmp(jmp_buf, int);
+
+#define UML_LONGJMP(buf, val) do { \
+ longjmp(*buf, val); \
+} while(0)
+
+#define UML_SETJMP(buf) ({ \
+ int n; \
+ volatile int enable; \
+ enable = get_signals(); \
+ n = setjmp(*buf); \
+ if(n != 0) \
+ set_signals(enable); \
+ n; })
+
+#endif
diff --git a/arch/um/include/shared/mem.h b/arch/um/include/shared/mem.h
new file mode 100644
index 0000000..5cd40e9
--- /dev/null
+++ b/arch/um/include/shared/mem.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __MEM_H__
+#define __MEM_H__
+
+extern int phys_mapping(unsigned long phys, unsigned long long *offset_out);
+
+extern unsigned long uml_physmem;
+static inline unsigned long to_phys(void *virt)
+{
+ return(((unsigned long) virt) - uml_physmem);
+}
+
+static inline void *to_virt(unsigned long phys)
+{
+ return((void *) uml_physmem + phys);
+}
+
+#endif
diff --git a/arch/um/include/shared/mem_user.h b/arch/um/include/shared/mem_user.h
new file mode 100644
index 0000000..cb84414
--- /dev/null
+++ b/arch/um/include/shared/mem_user.h
@@ -0,0 +1,62 @@
+/*
+ * arch/um/include/mem_user.h
+ *
+ * BRIEF MODULE DESCRIPTION
+ * user side memory interface for support IO memory inside user mode linux
+ *
+ * Copyright (C) 2001 RidgeRun, Inc.
+ * Author: RidgeRun, Inc.
+ * Greg Lonnon glonnon@ridgerun.com or info@ridgerun.com
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
+ * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef _MEM_USER_H
+#define _MEM_USER_H
+
+struct iomem_region {
+ struct iomem_region *next;
+ char *driver;
+ int fd;
+ int size;
+ unsigned long phys;
+ unsigned long virt;
+};
+
+extern struct iomem_region *iomem_regions;
+extern int iomem_size;
+
+#define ROUND_4M(n) ((((unsigned long) (n)) + (1 << 22)) & ~((1 << 22) - 1))
+
+extern int init_mem_user(void);
+extern void setup_memory(void *entry);
+extern unsigned long find_iomem(char *driver, unsigned long *len_out);
+extern void mem_total_pages(unsigned long physmem, unsigned long iomem,
+ unsigned long highmem);
+extern unsigned long get_vm(unsigned long len);
+extern void setup_physmem(unsigned long start, unsigned long usable,
+ unsigned long len, unsigned long long highmem);
+extern void add_iomem(char *name, int fd, unsigned long size);
+extern unsigned long phys_offset(unsigned long phys);
+extern void map_memory(unsigned long virt, unsigned long phys,
+ unsigned long len, int r, int w, int x);
+
+#endif
diff --git a/arch/um/include/shared/net_kern.h b/arch/um/include/shared/net_kern.h
new file mode 100644
index 0000000..012ac87
--- /dev/null
+++ b/arch/um/include/shared/net_kern.h
@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2002 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_NET_KERN_H
+#define __UM_NET_KERN_H
+
+#include <linux/netdevice.h>
+#include <linux/platform_device.h>
+#include <linux/skbuff.h>
+#include <linux/socket.h>
+#include <linux/list.h>
+#include <linux/workqueue.h>
+
+struct uml_net {
+ struct list_head list;
+ struct net_device *dev;
+ struct platform_device pdev;
+ int index;
+};
+
+struct uml_net_private {
+ struct list_head list;
+ spinlock_t lock;
+ struct net_device *dev;
+ struct timer_list tl;
+
+ struct work_struct work;
+ int fd;
+ unsigned char mac[ETH_ALEN];
+ int max_packet;
+ unsigned short (*protocol)(struct sk_buff *);
+ int (*open)(void *);
+ void (*close)(int, void *);
+ void (*remove)(void *);
+ int (*read)(int, struct sk_buff *skb, struct uml_net_private *);
+ int (*write)(int, struct sk_buff *skb, struct uml_net_private *);
+
+ void (*add_address)(unsigned char *, unsigned char *, void *);
+ void (*delete_address)(unsigned char *, unsigned char *, void *);
+ char user[0];
+};
+
+struct net_kern_info {
+ void (*init)(struct net_device *, void *);
+ unsigned short (*protocol)(struct sk_buff *);
+ int (*read)(int, struct sk_buff *skb, struct uml_net_private *);
+ int (*write)(int, struct sk_buff *skb, struct uml_net_private *);
+};
+
+struct transport {
+ struct list_head list;
+ const char *name;
+ int (* const setup)(char *, char **, void *);
+ const struct net_user_info *user;
+ const struct net_kern_info *kern;
+ const int private_size;
+ const int setup_size;
+};
+
+extern struct net_device *ether_init(int);
+extern unsigned short ether_protocol(struct sk_buff *);
+extern int tap_setup_common(char *str, char *type, char **dev_name,
+ char **mac_out, char **gate_addr);
+extern void register_transport(struct transport *new);
+extern unsigned short eth_protocol(struct sk_buff *skb);
+
+#endif
diff --git a/arch/um/include/shared/net_user.h b/arch/um/include/shared/net_user.h
new file mode 100644
index 0000000..3dabbe1
--- /dev/null
+++ b/arch/um/include/shared/net_user.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_NET_USER_H__
+#define __UM_NET_USER_H__
+
+#define ETH_ADDR_LEN (6)
+#define ETH_HEADER_ETHERTAP (16)
+#define ETH_HEADER_OTHER (26) /* 14 for ethernet + VLAN + MPLS for crazy people */
+#define ETH_MAX_PACKET (1500)
+
+#define UML_NET_VERSION (4)
+
+struct net_user_info {
+ int (*init)(void *, void *);
+ int (*open)(void *);
+ void (*close)(int, void *);
+ void (*remove)(void *);
+ void (*add_address)(unsigned char *, unsigned char *, void *);
+ void (*delete_address)(unsigned char *, unsigned char *, void *);
+ int max_packet;
+ int mtu;
+};
+
+extern void ether_user_init(void *data, void *dev);
+extern void iter_addresses(void *d, void (*cb)(unsigned char *,
+ unsigned char *, void *),
+ void *arg);
+
+extern void *get_output_buffer(int *len_out);
+extern void free_output_buffer(void *buffer);
+
+extern int tap_open_common(void *dev, char *gate_addr);
+extern void tap_check_ips(char *gate_addr, unsigned char *eth_addr);
+
+extern void read_output(int fd, char *output_out, int len);
+
+extern int net_read(int fd, void *buf, int len);
+extern int net_recvfrom(int fd, void *buf, int len);
+extern int net_write(int fd, void *buf, int len);
+extern int net_send(int fd, void *buf, int len);
+extern int net_sendto(int fd, void *buf, int len, void *to, int sock_len);
+
+extern void open_addr(unsigned char *addr, unsigned char *netmask, void *arg);
+extern void close_addr(unsigned char *addr, unsigned char *netmask, void *arg);
+
+extern char *split_if_spec(char *str, ...);
+
+extern int dev_netmask(void *d, void *m);
+
+#endif
diff --git a/arch/um/include/shared/os.h b/arch/um/include/shared/os.h
new file mode 100644
index 0000000..868e6c3
--- /dev/null
+++ b/arch/um/include/shared/os.h
@@ -0,0 +1,315 @@
+/*
+ * Copyright (C) 2015 Anton Ivanov (aivanov@{brocade.com,kot-begemot.co.uk})
+ * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __OS_H__
+#define __OS_H__
+
+#include <stdarg.h>
+#include <irq_user.h>
+#include <longjmp.h>
+#include <mm_id.h>
+
+#define CATCH_EINTR(expr) while ((errno = 0, ((expr) < 0)) && (errno == EINTR))
+
+#define OS_TYPE_FILE 1
+#define OS_TYPE_DIR 2
+#define OS_TYPE_SYMLINK 3
+#define OS_TYPE_CHARDEV 4
+#define OS_TYPE_BLOCKDEV 5
+#define OS_TYPE_FIFO 6
+#define OS_TYPE_SOCK 7
+
+/* os_access() flags */
+#define OS_ACC_F_OK 0 /* Test for existence. */
+#define OS_ACC_X_OK 1 /* Test for execute permission. */
+#define OS_ACC_W_OK 2 /* Test for write permission. */
+#define OS_ACC_R_OK 4 /* Test for read permission. */
+#define OS_ACC_RW_OK (OS_ACC_W_OK | OS_ACC_R_OK) /* Test for RW permission */
+
+#ifdef CONFIG_64BIT
+#define OS_LIB_PATH "/usr/lib64/"
+#else
+#define OS_LIB_PATH "/usr/lib/"
+#endif
+
+/*
+ * types taken from stat_file() in hostfs_user.c
+ * (if they are wrong here, they are wrong there...).
+ */
+struct uml_stat {
+ int ust_dev; /* device */
+ unsigned long long ust_ino; /* inode */
+ int ust_mode; /* protection */
+ int ust_nlink; /* number of hard links */
+ int ust_uid; /* user ID of owner */
+ int ust_gid; /* group ID of owner */
+ unsigned long long ust_size; /* total size, in bytes */
+ int ust_blksize; /* blocksize for filesystem I/O */
+ unsigned long long ust_blocks; /* number of blocks allocated */
+ unsigned long ust_atime; /* time of last access */
+ unsigned long ust_mtime; /* time of last modification */
+ unsigned long ust_ctime; /* time of last change */
+};
+
+struct openflags {
+ unsigned int r : 1;
+ unsigned int w : 1;
+ unsigned int s : 1; /* O_SYNC */
+ unsigned int c : 1; /* O_CREAT */
+ unsigned int t : 1; /* O_TRUNC */
+ unsigned int a : 1; /* O_APPEND */
+ unsigned int e : 1; /* O_EXCL */
+ unsigned int cl : 1; /* FD_CLOEXEC */
+};
+
+#define OPENFLAGS() ((struct openflags) { .r = 0, .w = 0, .s = 0, .c = 0, \
+ .t = 0, .a = 0, .e = 0, .cl = 0 })
+
+static inline struct openflags of_read(struct openflags flags)
+{
+ flags.r = 1;
+ return flags;
+}
+
+static inline struct openflags of_write(struct openflags flags)
+{
+ flags.w = 1;
+ return flags;
+}
+
+static inline struct openflags of_rdwr(struct openflags flags)
+{
+ return of_read(of_write(flags));
+}
+
+static inline struct openflags of_set_rw(struct openflags flags, int r, int w)
+{
+ flags.r = r;
+ flags.w = w;
+ return flags;
+}
+
+static inline struct openflags of_sync(struct openflags flags)
+{
+ flags.s = 1;
+ return flags;
+}
+
+static inline struct openflags of_create(struct openflags flags)
+{
+ flags.c = 1;
+ return flags;
+}
+
+static inline struct openflags of_trunc(struct openflags flags)
+{
+ flags.t = 1;
+ return flags;
+}
+
+static inline struct openflags of_append(struct openflags flags)
+{
+ flags.a = 1;
+ return flags;
+}
+
+static inline struct openflags of_excl(struct openflags flags)
+{
+ flags.e = 1;
+ return flags;
+}
+
+static inline struct openflags of_cloexec(struct openflags flags)
+{
+ flags.cl = 1;
+ return flags;
+}
+
+/* file.c */
+extern int os_stat_file(const char *file_name, struct uml_stat *buf);
+extern int os_stat_fd(const int fd, struct uml_stat *buf);
+extern int os_access(const char *file, int mode);
+extern int os_set_exec_close(int fd);
+extern int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg);
+extern int os_get_ifname(int fd, char *namebuf);
+extern int os_set_slip(int fd);
+extern int os_mode_fd(int fd, int mode);
+extern int os_fsync_file(int fd);
+
+extern int os_seek_file(int fd, unsigned long long offset);
+extern int os_open_file(const char *file, struct openflags flags, int mode);
+extern int os_read_file(int fd, void *buf, int len);
+extern int os_write_file(int fd, const void *buf, int count);
+extern int os_sync_file(int fd);
+extern int os_file_size(const char *file, unsigned long long *size_out);
+extern int os_file_modtime(const char *file, unsigned long *modtime);
+extern int os_pipe(int *fd, int stream, int close_on_exec);
+extern int os_set_fd_async(int fd);
+extern int os_clear_fd_async(int fd);
+extern int os_set_fd_block(int fd, int blocking);
+extern int os_accept_connection(int fd);
+extern int os_create_unix_socket(const char *file, int len, int close_on_exec);
+extern int os_shutdown_socket(int fd, int r, int w);
+extern void os_close_file(int fd);
+extern int os_rcv_fd(int fd, int *helper_pid_out);
+extern int create_unix_socket(char *file, int len, int close_on_exec);
+extern int os_connect_socket(const char *name);
+extern int os_file_type(char *file);
+extern int os_file_mode(const char *file, struct openflags *mode_out);
+extern int os_lock_file(int fd, int excl);
+extern void os_flush_stdout(void);
+extern int os_stat_filesystem(char *path, long *bsize_out,
+ long long *blocks_out, long long *bfree_out,
+ long long *bavail_out, long long *files_out,
+ long long *ffree_out, void *fsid_out,
+ int fsid_size, long *namelen_out,
+ long *spare_out);
+extern int os_change_dir(char *dir);
+extern int os_fchange_dir(int fd);
+extern unsigned os_major(unsigned long long dev);
+extern unsigned os_minor(unsigned long long dev);
+extern unsigned long long os_makedev(unsigned major, unsigned minor);
+
+/* start_up.c */
+extern void os_early_checks(void);
+extern void os_check_bugs(void);
+extern void check_host_supports_tls(int *supports_tls, int *tls_min);
+
+/* mem.c */
+extern int create_mem_file(unsigned long long len);
+
+/* process.c */
+extern unsigned long os_process_pc(int pid);
+extern int os_process_parent(int pid);
+extern void os_alarm_process(int pid);
+extern void os_stop_process(int pid);
+extern void os_kill_process(int pid, int reap_child);
+extern void os_kill_ptraced_process(int pid, int reap_child);
+
+extern int os_getpid(void);
+extern int os_getpgrp(void);
+
+extern void init_new_thread_signals(void);
+
+extern int os_map_memory(void *virt, int fd, unsigned long long off,
+ unsigned long len, int r, int w, int x);
+extern int os_protect_memory(void *addr, unsigned long len,
+ int r, int w, int x);
+extern int os_unmap_memory(void *addr, int len);
+extern int os_drop_memory(void *addr, int length);
+extern int can_drop_memory(void);
+extern void os_flush_stdout(void);
+extern int os_mincore(void *addr, unsigned long len);
+
+/* execvp.c */
+extern int execvp_noalloc(char *buf, const char *file, char *const argv[]);
+/* helper.c */
+extern int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv);
+extern int run_helper_thread(int (*proc)(void *), void *arg,
+ unsigned int flags, unsigned long *stack_out);
+extern int helper_wait(int pid);
+
+
+/* umid.c */
+extern int umid_file_name(char *name, char *buf, int len);
+extern int set_umid(char *name);
+extern char *get_umid(void);
+
+/* signal.c */
+extern void timer_set_signal_handler(void);
+extern void set_sigstack(void *sig_stack, int size);
+extern void remove_sigstack(void);
+extern void set_handler(int sig);
+extern int change_sig(int signal, int on);
+extern void block_signals(void);
+extern void unblock_signals(void);
+extern int get_signals(void);
+extern int set_signals(int enable);
+extern int os_is_signal_stack(void);
+extern void deliver_alarm(void);
+
+/* util.c */
+extern void stack_protections(unsigned long address);
+extern int raw(int fd);
+extern void setup_machinename(char *machine_out);
+extern void setup_hostinfo(char *buf, int len);
+extern void os_dump_core(void) __attribute__ ((noreturn));
+extern void um_early_printk(const char *s, unsigned int n);
+extern void os_fix_helper_signals(void);
+
+/* time.c */
+extern void os_idle_sleep(unsigned long long nsecs);
+extern int os_timer_create(void* timer);
+extern int os_timer_set_interval(void* timer, void* its);
+extern int os_timer_one_shot(int ticks);
+extern long long os_timer_disable(void);
+extern long os_timer_remain(void* timer);
+extern void uml_idle_timer(void);
+extern long long os_persistent_clock_emulation(void);
+extern long long os_nsecs(void);
+extern long long os_vnsecs(void);
+
+/* skas/mem.c */
+extern long run_syscall_stub(struct mm_id * mm_idp,
+ int syscall, unsigned long *args, long expected,
+ void **addr, int done);
+extern long syscall_stub_data(struct mm_id * mm_idp,
+ unsigned long *data, int data_count,
+ void **addr, void **stub_addr);
+extern int map(struct mm_id * mm_idp, unsigned long virt,
+ unsigned long len, int prot, int phys_fd,
+ unsigned long long offset, int done, void **data);
+extern int unmap(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
+ int done, void **data);
+extern int protect(struct mm_id * mm_idp, unsigned long addr,
+ unsigned long len, unsigned int prot, int done, void **data);
+
+/* skas/process.c */
+extern int is_skas_winch(int pid, int fd, void *data);
+extern int start_userspace(unsigned long stub_stack);
+extern int copy_context_skas0(unsigned long stack, int pid);
+extern void userspace(struct uml_pt_regs *regs);
+extern int map_stub_pages(int fd, unsigned long code, unsigned long data,
+ unsigned long stack);
+extern void new_thread(void *stack, jmp_buf *buf, void (*handler)(void));
+extern void switch_threads(jmp_buf *me, jmp_buf *you);
+extern int start_idle_thread(void *stack, jmp_buf *switch_buf);
+extern void initial_thread_cb_skas(void (*proc)(void *),
+ void *arg);
+extern void halt_skas(void);
+extern void reboot_skas(void);
+extern int get_syscall(struct uml_pt_regs *regs);
+
+/* irq.c */
+extern int os_waiting_for_events(struct irq_fd *active_fds);
+extern int os_create_pollfd(int fd, int events, void *tmp_pfd, int size_tmpfds);
+extern void os_free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg,
+ struct irq_fd *active_fds, struct irq_fd ***last_irq_ptr2);
+extern void os_free_irq_later(struct irq_fd *active_fds,
+ int irq, void *dev_id);
+extern int os_get_pollfd(int i);
+extern void os_set_pollfd(int i, int fd);
+extern void os_set_ioignore(void);
+
+/* sigio.c */
+extern int add_sigio_fd(int fd);
+extern int ignore_sigio_fd(int fd);
+extern void maybe_sigio_broken(int fd, int read);
+extern void sigio_broken(int fd, int read);
+
+/* sys-x86_64/prctl.c */
+extern int os_arch_prctl(int pid, int code, unsigned long *addr);
+
+/* tty.c */
+extern int get_pty(void);
+
+/* sys-$ARCH/task_size.c */
+extern unsigned long os_get_top_address(void);
+
+long syscall(long number, ...);
+
+#endif
diff --git a/arch/um/include/shared/ptrace_user.h b/arch/um/include/shared/ptrace_user.h
new file mode 100644
index 0000000..56b2f28
--- /dev/null
+++ b/arch/um/include/shared/ptrace_user.h
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __PTRACE_USER_H__
+#define __PTRACE_USER_H__
+
+#include <sys/ptrace.h>
+#include <sysdep/ptrace_user.h>
+
+extern int ptrace_getregs(long pid, unsigned long *regs_out);
+extern int ptrace_setregs(long pid, unsigned long *regs_in);
+
+/* syscall emulation path in ptrace */
+
+#ifndef PTRACE_SYSEMU
+#define PTRACE_SYSEMU 31
+#endif
+#ifndef PTRACE_SYSEMU_SINGLESTEP
+#define PTRACE_SYSEMU_SINGLESTEP 32
+#endif
+
+/* On architectures, that started to support PTRACE_O_TRACESYSGOOD
+ * in linux 2.4, there are two different definitions of
+ * PTRACE_SETOPTIONS: linux 2.4 uses 21 while linux 2.6 uses 0x4200.
+ * For binary compatibility, 2.6 also supports the old "21", named
+ * PTRACE_OLDSETOPTION. On these architectures, UML always must use
+ * "21", to ensure the kernel runs on 2.4 and 2.6 host without
+ * recompilation. So, we use PTRACE_OLDSETOPTIONS in UML.
+ * We also want to be able to build the kernel on 2.4, which doesn't
+ * have PTRACE_OLDSETOPTIONS. So, if it is missing, we declare
+ * PTRACE_OLDSETOPTIONS to be the same as PTRACE_SETOPTIONS.
+ *
+ * On architectures, that start to support PTRACE_O_TRACESYSGOOD on
+ * linux 2.6, PTRACE_OLDSETOPTIONS never is defined, and also isn't
+ * supported by the host kernel. In that case, our trick lets us use
+ * the new 0x4200 with the name PTRACE_OLDSETOPTIONS.
+ */
+#ifndef PTRACE_OLDSETOPTIONS
+#define PTRACE_OLDSETOPTIONS PTRACE_SETOPTIONS
+#endif
+
+void set_using_sysemu(int value);
+int get_using_sysemu(void);
+extern int sysemu_supported;
+
+#define SELECT_PTRACE_OPERATION(sysemu_mode, singlestep_mode) \
+ (((int[3][3] ) { \
+ { PTRACE_SYSCALL, PTRACE_SYSCALL, PTRACE_SINGLESTEP }, \
+ { PTRACE_SYSEMU, PTRACE_SYSEMU, PTRACE_SINGLESTEP }, \
+ { PTRACE_SYSEMU, PTRACE_SYSEMU_SINGLESTEP, \
+ PTRACE_SYSEMU_SINGLESTEP } }) \
+ [sysemu_mode][singlestep_mode])
+
+#endif
diff --git a/arch/um/include/shared/registers.h b/arch/um/include/shared/registers.h
new file mode 100644
index 0000000..f5b7635
--- /dev/null
+++ b/arch/um/include/shared/registers.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2004 PathScale, Inc
+ * Licensed under the GPL
+ */
+
+#ifndef __REGISTERS_H
+#define __REGISTERS_H
+
+#include <sysdep/ptrace.h>
+#include <sysdep/archsetjmp.h>
+
+extern int save_fp_registers(int pid, unsigned long *fp_regs);
+extern int restore_fp_registers(int pid, unsigned long *fp_regs);
+extern int save_fpx_registers(int pid, unsigned long *fp_regs);
+extern int restore_fpx_registers(int pid, unsigned long *fp_regs);
+extern int save_registers(int pid, struct uml_pt_regs *regs);
+extern int restore_registers(int pid, struct uml_pt_regs *regs);
+extern int init_registers(int pid);
+extern void get_safe_registers(unsigned long *regs, unsigned long *fp_regs);
+extern unsigned long get_thread_reg(int reg, jmp_buf *buf);
+extern int get_fp_registers(int pid, unsigned long *regs);
+extern int put_fp_registers(int pid, unsigned long *regs);
+
+#endif
diff --git a/arch/um/include/shared/sigio.h b/arch/um/include/shared/sigio.h
new file mode 100644
index 0000000..434f1a9
--- /dev/null
+++ b/arch/um/include/shared/sigio.h
@@ -0,0 +1,14 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __SIGIO_H__
+#define __SIGIO_H__
+
+extern int write_sigio_irq(int fd);
+extern int register_sigio_fd(int fd);
+extern void sigio_lock(void);
+extern void sigio_unlock(void);
+
+#endif
diff --git a/arch/um/include/shared/skas/mm_id.h b/arch/um/include/shared/skas/mm_id.h
new file mode 100644
index 0000000..48dd098
--- /dev/null
+++ b/arch/um/include/shared/skas/mm_id.h
@@ -0,0 +1,17 @@
+/*
+ * Copyright (C) 2005 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __MM_ID_H
+#define __MM_ID_H
+
+struct mm_id {
+ union {
+ int mm_fd;
+ int pid;
+ } u;
+ unsigned long stack;
+};
+
+#endif
diff --git a/arch/um/include/shared/skas/skas.h b/arch/um/include/shared/skas/skas.h
new file mode 100644
index 0000000..911f3c4
--- /dev/null
+++ b/arch/um/include/shared/skas/skas.h
@@ -0,0 +1,19 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __SKAS_H
+#define __SKAS_H
+
+#include <sysdep/ptrace.h>
+
+extern int userspace_pid[];
+
+extern int user_thread(unsigned long stack, int flags);
+extern void new_thread_handler(void);
+extern void handle_syscall(struct uml_pt_regs *regs);
+extern long execute_syscall_skas(void *r);
+extern unsigned long current_stub_stack(void);
+
+#endif
diff --git a/arch/um/include/shared/skas/stub-data.h b/arch/um/include/shared/skas/stub-data.h
new file mode 100644
index 0000000..a9deece
--- /dev/null
+++ b/arch/um/include/shared/skas/stub-data.h
@@ -0,0 +1,19 @@
+/*
+
+ * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
+ * Copyright (C) 2005 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __STUB_DATA_H
+#define __STUB_DATA_H
+
+#include <time.h>
+
+struct stub_data {
+ unsigned long offset;
+ int fd;
+ long err;
+};
+
+#endif
diff --git a/arch/um/include/shared/timer-internal.h b/arch/um/include/shared/timer-internal.h
new file mode 100644
index 0000000..03e6f21
--- /dev/null
+++ b/arch/um/include/shared/timer-internal.h
@@ -0,0 +1,13 @@
+/*
+ * Copyright (C) 2012 - 2014 Cisco Systems
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __TIMER_INTERNAL_H__
+#define __TIMER_INTERNAL_H__
+
+#define TIMER_MULTIPLIER 256
+#define TIMER_MIN_DELTA 500
+
+#endif
diff --git a/arch/um/include/shared/um_malloc.h b/arch/um/include/shared/um_malloc.h
new file mode 100644
index 0000000..6395fef
--- /dev/null
+++ b/arch/um/include/shared/um_malloc.h
@@ -0,0 +1,19 @@
+/*
+ * Copyright (C) 2005 Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_MALLOC_H__
+#define __UM_MALLOC_H__
+
+#include <generated/asm-offsets.h>
+
+extern void *uml_kmalloc(int size, int flags);
+extern void kfree(const void *ptr);
+
+extern void *vmalloc(unsigned long size);
+extern void vfree(void *ptr);
+
+#endif /* __UM_MALLOC_H__ */
+
+
diff --git a/arch/um/include/shared/user.h b/arch/um/include/shared/user.h
new file mode 100644
index 0000000..4cff19f
--- /dev/null
+++ b/arch/um/include/shared/user.h
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __USER_H__
+#define __USER_H__
+
+#include <generated/asm-offsets.h>
+
+/*
+ * The usual definition - copied here because the kernel provides its own,
+ * fancier, type-safe, definition. Using that one would require
+ * copying too much infrastructure for my taste, so userspace files
+ * get less checking than kernel files.
+ */
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
+
+/* This is to get size_t */
+#ifndef __UM_HOST__
+#include <linux/types.h>
+#else
+#include <stddef.h>
+#endif
+
+extern void panic(const char *fmt, ...)
+ __attribute__ ((format (printf, 1, 2)));
+
+/* Requires preincluding include/linux/kern_levels.h */
+#define UM_KERN_EMERG KERN_EMERG
+#define UM_KERN_ALERT KERN_ALERT
+#define UM_KERN_CRIT KERN_CRIT
+#define UM_KERN_ERR KERN_ERR
+#define UM_KERN_WARNING KERN_WARNING
+#define UM_KERN_NOTICE KERN_NOTICE
+#define UM_KERN_INFO KERN_INFO
+#define UM_KERN_DEBUG KERN_DEBUG
+#define UM_KERN_CONT KERN_CONT
+
+#ifdef UML_CONFIG_PRINTK
+extern int printk(const char *fmt, ...)
+ __attribute__ ((format (printf, 1, 2)));
+#else
+static inline int printk(const char *fmt, ...)
+{
+ return 0;
+}
+#endif
+
+extern int in_aton(char *str);
+extern size_t strlcpy(char *, const char *, size_t);
+extern size_t strlcat(char *, const char *, size_t);
+
+/* Copied from linux/compiler-gcc.h since we can't include it directly */
+#define barrier() __asm__ __volatile__("": : :"memory")
+
+#endif
diff --git a/arch/um/kernel/Makefile b/arch/um/kernel/Makefile
new file mode 100644
index 0000000..a6a5e42
--- /dev/null
+++ b/arch/um/kernel/Makefile
@@ -0,0 +1,50 @@
+#
+# Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux,intel}.com)
+# Licensed under the GPL
+#
+
+CPPFLAGS_vmlinux.lds := -DSTART=$(LDS_START) \
+ -DELF_ARCH=$(LDS_ELF_ARCH) \
+ -DELF_FORMAT=$(LDS_ELF_FORMAT) \
+ $(LDS_EXTRA)
+extra-y := vmlinux.lds
+clean-files :=
+
+obj-y = config.o exec.o exitcode.o irq.o ksyms.o mem.o \
+ physmem.o process.o ptrace.o reboot.o sigio.o \
+ signal.o syscall.o sysrq.o time.o tlb.o trap.o \
+ um_arch.o umid.o maccess.o kmsg_dump.o skas/
+
+obj-$(CONFIG_BLK_DEV_INITRD) += initrd.o
+obj-$(CONFIG_GPROF) += gprof_syms.o
+obj-$(CONFIG_GCOV) += gmon_syms.o
+obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
+obj-$(CONFIG_STACKTRACE) += stacktrace.o
+
+USER_OBJS := config.o
+
+include arch/um/scripts/Makefile.rules
+
+targets := config.c config.tmp
+
+# Be careful with the below Sed code - sed is pitfall-rich!
+# We use sed to lower build requirements, for "embedded" builders for instance.
+
+$(obj)/config.tmp: $(objtree)/.config FORCE
+ $(call if_changed,quote1)
+
+quiet_cmd_quote1 = QUOTE $@
+ cmd_quote1 = sed -e 's/"/\\"/g' -e 's/^/"/' -e 's/$$/\\n",/' \
+ $< > $@
+
+$(obj)/config.c: $(src)/config.c.in $(obj)/config.tmp FORCE
+ $(call if_changed,quote2)
+
+quiet_cmd_quote2 = QUOTE $@
+ cmd_quote2 = sed -e '/CONFIG/{' \
+ -e 's/"CONFIG"//' \
+ -e 'r $(obj)/config.tmp' \
+ -e 'a \' \
+ -e '""' \
+ -e '}' \
+ $< > $@
diff --git a/arch/um/kernel/asm-offsets.c b/arch/um/kernel/asm-offsets.c
new file mode 100644
index 0000000..1fb1223
--- /dev/null
+++ b/arch/um/kernel/asm-offsets.c
@@ -0,0 +1 @@
+#include <sysdep/kernel-offsets.h>
diff --git a/arch/um/kernel/config.c.in b/arch/um/kernel/config.c.in
new file mode 100644
index 0000000..972bf16
--- /dev/null
+++ b/arch/um/kernel/config.c.in
@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <init.h>
+
+static __initdata const char *config[] = {
+"CONFIG"
+};
+
+static int __init print_config(char *line, int *add)
+{
+ int i;
+ for (i = 0; i < sizeof(config)/sizeof(config[0]); i++)
+ printf("%s", config[i]);
+ exit(0);
+}
+
+__uml_setup("--showconfig", print_config,
+"--showconfig\n"
+" Prints the config file that this UML binary was generated from.\n\n"
+);
+
diff --git a/arch/um/kernel/dyn.lds.S b/arch/um/kernel/dyn.lds.S
new file mode 100644
index 0000000..adde088
--- /dev/null
+++ b/arch/um/kernel/dyn.lds.S
@@ -0,0 +1,168 @@
+#include <asm-generic/vmlinux.lds.h>
+#include <asm/page.h>
+
+OUTPUT_FORMAT(ELF_FORMAT)
+OUTPUT_ARCH(ELF_ARCH)
+ENTRY(_start)
+jiffies = jiffies_64;
+
+SECTIONS
+{
+ PROVIDE (__executable_start = START);
+ . = START + SIZEOF_HEADERS;
+ .interp : { *(.interp) }
+ __binary_start = .;
+ . = ALIGN(4096); /* Init code and data */
+ _text = .;
+ INIT_TEXT_SECTION(PAGE_SIZE)
+
+ . = ALIGN(PAGE_SIZE);
+
+ /* Read-only sections, merged into text segment: */
+ .hash : { *(.hash) }
+ .gnu.hash : { *(.gnu.hash) }
+ .dynsym : { *(.dynsym) }
+ .dynstr : { *(.dynstr) }
+ .gnu.version : { *(.gnu.version) }
+ .gnu.version_d : { *(.gnu.version_d) }
+ .gnu.version_r : { *(.gnu.version_r) }
+ .rel.init : { *(.rel.init) }
+ .rela.init : { *(.rela.init) }
+ .rel.text : { *(.rel.text .rel.text.* .rel.gnu.linkonce.t.*) }
+ .rela.text : { *(.rela.text .rela.text.* .rela.gnu.linkonce.t.*) }
+ .rel.fini : { *(.rel.fini) }
+ .rela.fini : { *(.rela.fini) }
+ .rel.rodata : { *(.rel.rodata .rel.rodata.* .rel.gnu.linkonce.r.*) }
+ .rela.rodata : { *(.rela.rodata .rela.rodata.* .rela.gnu.linkonce.r.*) }
+ .rel.data : { *(.rel.data .rel.data.* .rel.gnu.linkonce.d.*) }
+ .rela.data : { *(.rela.data .rela.data.* .rela.gnu.linkonce.d.*) }
+ .rel.tdata : { *(.rel.tdata .rel.tdata.* .rel.gnu.linkonce.td.*) }
+ .rela.tdata : { *(.rela.tdata .rela.tdata.* .rela.gnu.linkonce.td.*) }
+ .rel.tbss : { *(.rel.tbss .rel.tbss.* .rel.gnu.linkonce.tb.*) }
+ .rela.tbss : { *(.rela.tbss .rela.tbss.* .rela.gnu.linkonce.tb.*) }
+ .rel.ctors : { *(.rel.ctors) }
+ .rela.ctors : { *(.rela.ctors) }
+ .rel.dtors : { *(.rel.dtors) }
+ .rela.dtors : { *(.rela.dtors) }
+ .rel.got : { *(.rel.got) }
+ .rela.got : { *(.rela.got) }
+ .rel.bss : { *(.rel.bss .rel.bss.* .rel.gnu.linkonce.b.*) }
+ .rela.bss : { *(.rela.bss .rela.bss.* .rela.gnu.linkonce.b.*) }
+ .rel.plt : {
+ *(.rel.plt)
+ PROVIDE_HIDDEN(__rel_iplt_start = .);
+ *(.rel.iplt)
+ PROVIDE_HIDDEN(__rel_iplt_end = .);
+ }
+ .rela.plt : {
+ *(.rela.plt)
+ PROVIDE_HIDDEN(__rela_iplt_start = .);
+ *(.rela.iplt)
+ PROVIDE_HIDDEN(__rela_iplt_end = .);
+ }
+ .init : {
+ KEEP (*(.init))
+ } =0x90909090
+ .plt : { *(.plt) }
+ .text : {
+ _stext = .;
+ TEXT_TEXT
+ SCHED_TEXT
+ LOCK_TEXT
+ *(.fixup)
+ *(.stub .text.* .gnu.linkonce.t.*)
+ /* .gnu.warning sections are handled specially by elf32.em. */
+ *(.gnu.warning)
+
+ . = ALIGN(PAGE_SIZE);
+ } =0x90909090
+ . = ALIGN(PAGE_SIZE);
+ .syscall_stub : {
+ __syscall_stub_start = .;
+ *(.__syscall_stub*)
+ __syscall_stub_end = .;
+ }
+ .fini : {
+ KEEP (*(.fini))
+ } =0x90909090
+
+ .kstrtab : { *(.kstrtab) }
+
+ #include <asm/common.lds.S>
+
+ __init_begin = .;
+ init.data : { INIT_DATA }
+ __init_end = .;
+
+ /* Ensure the __preinit_array_start label is properly aligned. We
+ could instead move the label definition inside the section, but
+ the linker would then create the section even if it turns out to
+ be empty, which isn't pretty. */
+ . = ALIGN(32 / 8);
+ .preinit_array : { *(.preinit_array) }
+ .init_array : { *(.init_array) }
+ .fini_array : { *(.fini_array) }
+ .data : {
+ INIT_TASK_DATA(KERNEL_STACK_SIZE)
+ . = ALIGN(KERNEL_STACK_SIZE);
+ *(.data..init_irqstack)
+ DATA_DATA
+ *(.data.* .gnu.linkonce.d.*)
+ SORT(CONSTRUCTORS)
+ }
+ .data1 : { *(.data1) }
+ .tdata : { *(.tdata .tdata.* .gnu.linkonce.td.*) }
+ .tbss : { *(.tbss .tbss.* .gnu.linkonce.tb.*) *(.tcommon) }
+ .eh_frame : { KEEP (*(.eh_frame)) }
+ .gcc_except_table : { *(.gcc_except_table) }
+ .dynamic : { *(.dynamic) }
+ .ctors : {
+ /* gcc uses crtbegin.o to find the start of
+ the constructors, so we make sure it is
+ first. Because this is a wildcard, it
+ doesn't matter if the user does not
+ actually link against crtbegin.o; the
+ linker won't look for a file to match a
+ wildcard. The wildcard also means that it
+ doesn't matter which directory crtbegin.o
+ is in. */
+ KEEP (*crtbegin.o(.ctors))
+ /* We don't want to include the .ctor section from
+ from the crtend.o file until after the sorted ctors.
+ The .ctor section from the crtend file contains the
+ end of ctors marker and it must be last */
+ KEEP (*(EXCLUDE_FILE (*crtend.o ) .ctors))
+ KEEP (*(SORT(.ctors.*)))
+ KEEP (*(.ctors))
+ }
+ .dtors : {
+ KEEP (*crtbegin.o(.dtors))
+ KEEP (*(EXCLUDE_FILE (*crtend.o ) .dtors))
+ KEEP (*(SORT(.dtors.*)))
+ KEEP (*(.dtors))
+ }
+ .jcr : { KEEP (*(.jcr)) }
+ .got : { *(.got.plt) *(.got) }
+ _edata = .;
+ PROVIDE (edata = .);
+ .bss : {
+ __bss_start = .;
+ *(.dynbss)
+ *(.bss .bss.* .gnu.linkonce.b.*)
+ *(COMMON)
+ /* Align here to ensure that the .bss section occupies space up to
+ _end. Align after .bss to ensure correct alignment even if the
+ .bss section disappears because there are no input sections. */
+ . = ALIGN(32 / 8);
+ . = ALIGN(32 / 8);
+ }
+ __bss_stop = .;
+ _end = .;
+ PROVIDE (end = .);
+
+ STABS_DEBUG
+
+ DWARF_DEBUG
+
+ DISCARDS
+}
diff --git a/arch/um/kernel/early_printk.c b/arch/um/kernel/early_printk.c
new file mode 100644
index 0000000..4a0800b
--- /dev/null
+++ b/arch/um/kernel/early_printk.c
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2011 Richard Weinberger <richrd@nod.at>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/console.h>
+#include <linux/init.h>
+#include <os.h>
+
+static void early_console_write(struct console *con, const char *s, unsigned int n)
+{
+ um_early_printk(s, n);
+}
+
+static struct console early_console_dev = {
+ .name = "earlycon",
+ .write = early_console_write,
+ .flags = CON_BOOT,
+ .index = -1,
+};
+
+static int __init setup_early_printk(char *buf)
+{
+ if (!early_console) {
+ early_console = &early_console_dev;
+ register_console(&early_console_dev);
+ }
+ return 0;
+}
+
+early_param("earlyprintk", setup_early_printk);
diff --git a/arch/um/kernel/exec.c b/arch/um/kernel/exec.c
new file mode 100644
index 0000000..0d7103c
--- /dev/null
+++ b/arch/um/kernel/exec.c
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/stddef.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/ptrace.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <asm/current.h>
+#include <asm/processor.h>
+#include <asm/uaccess.h>
+#include <as-layout.h>
+#include <mem_user.h>
+#include <skas.h>
+#include <os.h>
+
+void flush_thread(void)
+{
+ void *data = NULL;
+ int ret;
+
+ arch_flush_thread(¤t->thread.arch);
+
+ ret = unmap(¤t->mm->context.id, 0, STUB_START, 0, &data);
+ ret = ret || unmap(¤t->mm->context.id, STUB_END,
+ host_task_size - STUB_END, 1, &data);
+ if (ret) {
+ printk(KERN_ERR "flush_thread - clearing address space failed, "
+ "err = %d\n", ret);
+ force_sig(SIGKILL, current);
+ }
+ get_safe_registers(current_pt_regs()->regs.gp,
+ current_pt_regs()->regs.fp);
+
+ __switch_mm(¤t->mm->context.id);
+}
+
+void start_thread(struct pt_regs *regs, unsigned long eip, unsigned long esp)
+{
+ PT_REGS_IP(regs) = eip;
+ PT_REGS_SP(regs) = esp;
+ current->ptrace &= ~PT_DTRACE;
+#ifdef SUBARCH_EXECVE1
+ SUBARCH_EXECVE1(regs->regs);
+#endif
+}
+EXPORT_SYMBOL(start_thread);
diff --git a/arch/um/kernel/exitcode.c b/arch/um/kernel/exitcode.c
new file mode 100644
index 0000000..41ebbfe
--- /dev/null
+++ b/arch/um/kernel/exitcode.c
@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/ctype.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/types.h>
+#include <asm/uaccess.h>
+
+/*
+ * If read and write race, the read will still atomically read a valid
+ * value.
+ */
+int uml_exitcode = 0;
+
+static int exitcode_proc_show(struct seq_file *m, void *v)
+{
+ int val;
+
+ /*
+ * Save uml_exitcode in a local so that we don't need to guarantee
+ * that sprintf accesses it atomically.
+ */
+ val = uml_exitcode;
+ seq_printf(m, "%d\n", val);
+ return 0;
+}
+
+static int exitcode_proc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, exitcode_proc_show, NULL);
+}
+
+static ssize_t exitcode_proc_write(struct file *file,
+ const char __user *buffer, size_t count, loff_t *pos)
+{
+ char *end, buf[sizeof("nnnnn\0")];
+ size_t size;
+ int tmp;
+
+ size = min(count, sizeof(buf));
+ if (copy_from_user(buf, buffer, size))
+ return -EFAULT;
+
+ tmp = simple_strtol(buf, &end, 0);
+ if ((*end != '\0') && !isspace(*end))
+ return -EINVAL;
+
+ uml_exitcode = tmp;
+ return count;
+}
+
+static const struct file_operations exitcode_proc_fops = {
+ .owner = THIS_MODULE,
+ .open = exitcode_proc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+ .write = exitcode_proc_write,
+};
+
+static int make_proc_exitcode(void)
+{
+ struct proc_dir_entry *ent;
+
+ ent = proc_create("exitcode", 0600, NULL, &exitcode_proc_fops);
+ if (ent == NULL) {
+ printk(KERN_WARNING "make_proc_exitcode : Failed to register "
+ "/proc/exitcode\n");
+ return 0;
+ }
+ return 0;
+}
+
+__initcall(make_proc_exitcode);
diff --git a/arch/um/kernel/gmon_syms.c b/arch/um/kernel/gmon_syms.c
new file mode 100644
index 0000000..1bf6126
--- /dev/null
+++ b/arch/um/kernel/gmon_syms.c
@@ -0,0 +1,9 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/module.h>
+
+extern void __bb_init_func(void *) __attribute__((weak));
+EXPORT_SYMBOL(__bb_init_func);
diff --git a/arch/um/kernel/gprof_syms.c b/arch/um/kernel/gprof_syms.c
new file mode 100644
index 0000000..74ddb44
--- /dev/null
+++ b/arch/um/kernel/gprof_syms.c
@@ -0,0 +1,9 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/module.h>
+
+extern void mcount(void);
+EXPORT_SYMBOL(mcount);
diff --git a/arch/um/kernel/initrd.c b/arch/um/kernel/initrd.c
new file mode 100644
index 0000000..55cead8
--- /dev/null
+++ b/arch/um/kernel/initrd.c
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/init.h>
+#include <linux/bootmem.h>
+#include <linux/initrd.h>
+#include <asm/types.h>
+#include <init.h>
+#include <os.h>
+
+/* Changed by uml_initrd_setup, which is a setup */
+static char *initrd __initdata = NULL;
+static int load_initrd(char *filename, void *buf, int size);
+
+static int __init read_initrd(void)
+{
+ void *area;
+ long long size;
+ int err;
+
+ if (initrd == NULL)
+ return 0;
+
+ err = os_file_size(initrd, &size);
+ if (err)
+ return 0;
+
+ /*
+ * This is necessary because alloc_bootmem craps out if you
+ * ask for no memory.
+ */
+ if (size == 0) {
+ printk(KERN_ERR "\"%s\" is a zero-size initrd\n", initrd);
+ return 0;
+ }
+
+ area = alloc_bootmem(size);
+ if (area == NULL)
+ return 0;
+
+ if (load_initrd(initrd, area, size) == -1)
+ return 0;
+
+ initrd_start = (unsigned long) area;
+ initrd_end = initrd_start + size;
+ return 0;
+}
+
+__uml_postsetup(read_initrd);
+
+static int __init uml_initrd_setup(char *line, int *add)
+{
+ initrd = line;
+ return 0;
+}
+
+__uml_setup("initrd=", uml_initrd_setup,
+"initrd=<initrd image>\n"
+" This is used to boot UML from an initrd image. The argument is the\n"
+" name of the file containing the image.\n\n"
+);
+
+static int load_initrd(char *filename, void *buf, int size)
+{
+ int fd, n;
+
+ fd = os_open_file(filename, of_read(OPENFLAGS()), 0);
+ if (fd < 0) {
+ printk(KERN_ERR "Opening '%s' failed - err = %d\n", filename,
+ -fd);
+ return -1;
+ }
+ n = os_read_file(fd, buf, size);
+ if (n != size) {
+ printk(KERN_ERR "Read of %d bytes from '%s' failed, "
+ "err = %d\n", size,
+ filename, -n);
+ return -1;
+ }
+
+ os_close_file(fd);
+ return 0;
+}
diff --git a/arch/um/kernel/irq.c b/arch/um/kernel/irq.c
new file mode 100644
index 0000000..23cb935
--- /dev/null
+++ b/arch/um/kernel/irq.c
@@ -0,0 +1,470 @@
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ * Derived (i.e. mostly copied) from arch/i386/kernel/irq.c:
+ * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
+ */
+
+#include <linux/cpumask.h>
+#include <linux/hardirq.h>
+#include <linux/interrupt.h>
+#include <linux/kernel_stat.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <as-layout.h>
+#include <kern_util.h>
+#include <os.h>
+
+/*
+ * This list is accessed under irq_lock, except in sigio_handler,
+ * where it is safe from being modified. IRQ handlers won't change it -
+ * if an IRQ source has vanished, it will be freed by free_irqs just
+ * before returning from sigio_handler. That will process a separate
+ * list of irqs to free, with its own locking, coming back here to
+ * remove list elements, taking the irq_lock to do so.
+ */
+static struct irq_fd *active_fds = NULL;
+static struct irq_fd **last_irq_ptr = &active_fds;
+
+extern void free_irqs(void);
+
+void sigio_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs)
+{
+ struct irq_fd *irq_fd;
+ int n;
+
+ while (1) {
+ n = os_waiting_for_events(active_fds);
+ if (n <= 0) {
+ if (n == -EINTR)
+ continue;
+ else break;
+ }
+
+ for (irq_fd = active_fds; irq_fd != NULL;
+ irq_fd = irq_fd->next) {
+ if (irq_fd->current_events != 0) {
+ irq_fd->current_events = 0;
+ do_IRQ(irq_fd->irq, regs);
+ }
+ }
+ }
+
+ free_irqs();
+}
+
+static DEFINE_SPINLOCK(irq_lock);
+
+static int activate_fd(int irq, int fd, int type, void *dev_id)
+{
+ struct pollfd *tmp_pfd;
+ struct irq_fd *new_fd, *irq_fd;
+ unsigned long flags;
+ int events, err, n;
+
+ err = os_set_fd_async(fd);
+ if (err < 0)
+ goto out;
+
+ err = -ENOMEM;
+ new_fd = kmalloc(sizeof(struct irq_fd), GFP_KERNEL);
+ if (new_fd == NULL)
+ goto out;
+
+ if (type == IRQ_READ)
+ events = UM_POLLIN | UM_POLLPRI;
+ else events = UM_POLLOUT;
+ *new_fd = ((struct irq_fd) { .next = NULL,
+ .id = dev_id,
+ .fd = fd,
+ .type = type,
+ .irq = irq,
+ .events = events,
+ .current_events = 0 } );
+
+ err = -EBUSY;
+ spin_lock_irqsave(&irq_lock, flags);
+ for (irq_fd = active_fds; irq_fd != NULL; irq_fd = irq_fd->next) {
+ if ((irq_fd->fd == fd) && (irq_fd->type == type)) {
+ printk(KERN_ERR "Registering fd %d twice\n", fd);
+ printk(KERN_ERR "Irqs : %d, %d\n", irq_fd->irq, irq);
+ printk(KERN_ERR "Ids : 0x%p, 0x%p\n", irq_fd->id,
+ dev_id);
+ goto out_unlock;
+ }
+ }
+
+ if (type == IRQ_WRITE)
+ fd = -1;
+
+ tmp_pfd = NULL;
+ n = 0;
+
+ while (1) {
+ n = os_create_pollfd(fd, events, tmp_pfd, n);
+ if (n == 0)
+ break;
+
+ /*
+ * n > 0
+ * It means we couldn't put new pollfd to current pollfds
+ * and tmp_fds is NULL or too small for new pollfds array.
+ * Needed size is equal to n as minimum.
+ *
+ * Here we have to drop the lock in order to call
+ * kmalloc, which might sleep.
+ * If something else came in and changed the pollfds array
+ * so we will not be able to put new pollfd struct to pollfds
+ * then we free the buffer tmp_fds and try again.
+ */
+ spin_unlock_irqrestore(&irq_lock, flags);
+ kfree(tmp_pfd);
+
+ tmp_pfd = kmalloc(n, GFP_KERNEL);
+ if (tmp_pfd == NULL)
+ goto out_kfree;
+
+ spin_lock_irqsave(&irq_lock, flags);
+ }
+
+ *last_irq_ptr = new_fd;
+ last_irq_ptr = &new_fd->next;
+
+ spin_unlock_irqrestore(&irq_lock, flags);
+
+ /*
+ * This calls activate_fd, so it has to be outside the critical
+ * section.
+ */
+ maybe_sigio_broken(fd, (type == IRQ_READ));
+
+ return 0;
+
+ out_unlock:
+ spin_unlock_irqrestore(&irq_lock, flags);
+ out_kfree:
+ kfree(new_fd);
+ out:
+ return err;
+}
+
+static void free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&irq_lock, flags);
+ os_free_irq_by_cb(test, arg, active_fds, &last_irq_ptr);
+ spin_unlock_irqrestore(&irq_lock, flags);
+}
+
+struct irq_and_dev {
+ int irq;
+ void *dev;
+};
+
+static int same_irq_and_dev(struct irq_fd *irq, void *d)
+{
+ struct irq_and_dev *data = d;
+
+ return ((irq->irq == data->irq) && (irq->id == data->dev));
+}
+
+static void free_irq_by_irq_and_dev(unsigned int irq, void *dev)
+{
+ struct irq_and_dev data = ((struct irq_and_dev) { .irq = irq,
+ .dev = dev });
+
+ free_irq_by_cb(same_irq_and_dev, &data);
+}
+
+static int same_fd(struct irq_fd *irq, void *fd)
+{
+ return (irq->fd == *((int *)fd));
+}
+
+void free_irq_by_fd(int fd)
+{
+ free_irq_by_cb(same_fd, &fd);
+}
+
+/* Must be called with irq_lock held */
+static struct irq_fd *find_irq_by_fd(int fd, int irqnum, int *index_out)
+{
+ struct irq_fd *irq;
+ int i = 0;
+ int fdi;
+
+ for (irq = active_fds; irq != NULL; irq = irq->next) {
+ if ((irq->fd == fd) && (irq->irq == irqnum))
+ break;
+ i++;
+ }
+ if (irq == NULL) {
+ printk(KERN_ERR "find_irq_by_fd doesn't have descriptor %d\n",
+ fd);
+ goto out;
+ }
+ fdi = os_get_pollfd(i);
+ if ((fdi != -1) && (fdi != fd)) {
+ printk(KERN_ERR "find_irq_by_fd - mismatch between active_fds "
+ "and pollfds, fd %d vs %d, need %d\n", irq->fd,
+ fdi, fd);
+ irq = NULL;
+ goto out;
+ }
+ *index_out = i;
+ out:
+ return irq;
+}
+
+void reactivate_fd(int fd, int irqnum)
+{
+ struct irq_fd *irq;
+ unsigned long flags;
+ int i;
+
+ spin_lock_irqsave(&irq_lock, flags);
+ irq = find_irq_by_fd(fd, irqnum, &i);
+ if (irq == NULL) {
+ spin_unlock_irqrestore(&irq_lock, flags);
+ return;
+ }
+ os_set_pollfd(i, irq->fd);
+ spin_unlock_irqrestore(&irq_lock, flags);
+
+ add_sigio_fd(fd);
+}
+
+void deactivate_fd(int fd, int irqnum)
+{
+ struct irq_fd *irq;
+ unsigned long flags;
+ int i;
+
+ spin_lock_irqsave(&irq_lock, flags);
+ irq = find_irq_by_fd(fd, irqnum, &i);
+ if (irq == NULL) {
+ spin_unlock_irqrestore(&irq_lock, flags);
+ return;
+ }
+
+ os_set_pollfd(i, -1);
+ spin_unlock_irqrestore(&irq_lock, flags);
+
+ ignore_sigio_fd(fd);
+}
+EXPORT_SYMBOL(deactivate_fd);
+
+/*
+ * Called just before shutdown in order to provide a clean exec
+ * environment in case the system is rebooting. No locking because
+ * that would cause a pointless shutdown hang if something hadn't
+ * released the lock.
+ */
+int deactivate_all_fds(void)
+{
+ struct irq_fd *irq;
+ int err;
+
+ for (irq = active_fds; irq != NULL; irq = irq->next) {
+ err = os_clear_fd_async(irq->fd);
+ if (err)
+ return err;
+ }
+ /* If there is a signal already queued, after unblocking ignore it */
+ os_set_ioignore();
+
+ return 0;
+}
+
+/*
+ * do_IRQ handles all normal device IRQs (the special
+ * SMP cross-CPU interrupts have their own specific
+ * handlers).
+ */
+unsigned int do_IRQ(int irq, struct uml_pt_regs *regs)
+{
+ struct pt_regs *old_regs = set_irq_regs((struct pt_regs *)regs);
+ irq_enter();
+ generic_handle_irq(irq);
+ irq_exit();
+ set_irq_regs(old_regs);
+ return 1;
+}
+
+void um_free_irq(unsigned int irq, void *dev)
+{
+ free_irq_by_irq_and_dev(irq, dev);
+ free_irq(irq, dev);
+}
+EXPORT_SYMBOL(um_free_irq);
+
+int um_request_irq(unsigned int irq, int fd, int type,
+ irq_handler_t handler,
+ unsigned long irqflags, const char * devname,
+ void *dev_id)
+{
+ int err;
+
+ if (fd != -1) {
+ err = activate_fd(irq, fd, type, dev_id);
+ if (err)
+ return err;
+ }
+
+ return request_irq(irq, handler, irqflags, devname, dev_id);
+}
+
+EXPORT_SYMBOL(um_request_irq);
+EXPORT_SYMBOL(reactivate_fd);
+
+/*
+ * irq_chip must define at least enable/disable and ack when
+ * the edge handler is used.
+ */
+static void dummy(struct irq_data *d)
+{
+}
+
+/* This is used for everything else than the timer. */
+static struct irq_chip normal_irq_type = {
+ .name = "SIGIO",
+ .irq_disable = dummy,
+ .irq_enable = dummy,
+ .irq_ack = dummy,
+ .irq_mask = dummy,
+ .irq_unmask = dummy,
+};
+
+static struct irq_chip SIGVTALRM_irq_type = {
+ .name = "SIGVTALRM",
+ .irq_disable = dummy,
+ .irq_enable = dummy,
+ .irq_ack = dummy,
+ .irq_mask = dummy,
+ .irq_unmask = dummy,
+};
+
+void __init init_IRQ(void)
+{
+ int i;
+
+ irq_set_chip_and_handler(TIMER_IRQ, &SIGVTALRM_irq_type, handle_edge_irq);
+
+ for (i = 1; i < NR_IRQS; i++)
+ irq_set_chip_and_handler(i, &normal_irq_type, handle_edge_irq);
+}
+
+/*
+ * IRQ stack entry and exit:
+ *
+ * Unlike i386, UML doesn't receive IRQs on the normal kernel stack
+ * and switch over to the IRQ stack after some preparation. We use
+ * sigaltstack to receive signals on a separate stack from the start.
+ * These two functions make sure the rest of the kernel won't be too
+ * upset by being on a different stack. The IRQ stack has a
+ * thread_info structure at the bottom so that current et al continue
+ * to work.
+ *
+ * to_irq_stack copies the current task's thread_info to the IRQ stack
+ * thread_info and sets the tasks's stack to point to the IRQ stack.
+ *
+ * from_irq_stack copies the thread_info struct back (flags may have
+ * been modified) and resets the task's stack pointer.
+ *
+ * Tricky bits -
+ *
+ * What happens when two signals race each other? UML doesn't block
+ * signals with sigprocmask, SA_DEFER, or sa_mask, so a second signal
+ * could arrive while a previous one is still setting up the
+ * thread_info.
+ *
+ * There are three cases -
+ * The first interrupt on the stack - sets up the thread_info and
+ * handles the interrupt
+ * A nested interrupt interrupting the copying of the thread_info -
+ * can't handle the interrupt, as the stack is in an unknown state
+ * A nested interrupt not interrupting the copying of the
+ * thread_info - doesn't do any setup, just handles the interrupt
+ *
+ * The first job is to figure out whether we interrupted stack setup.
+ * This is done by xchging the signal mask with thread_info->pending.
+ * If the value that comes back is zero, then there is no setup in
+ * progress, and the interrupt can be handled. If the value is
+ * non-zero, then there is stack setup in progress. In order to have
+ * the interrupt handled, we leave our signal in the mask, and it will
+ * be handled by the upper handler after it has set up the stack.
+ *
+ * Next is to figure out whether we are the outer handler or a nested
+ * one. As part of setting up the stack, thread_info->real_thread is
+ * set to non-NULL (and is reset to NULL on exit). This is the
+ * nesting indicator. If it is non-NULL, then the stack is already
+ * set up and the handler can run.
+ */
+
+static unsigned long pending_mask;
+
+unsigned long to_irq_stack(unsigned long *mask_out)
+{
+ struct thread_info *ti;
+ unsigned long mask, old;
+ int nested;
+
+ mask = xchg(&pending_mask, *mask_out);
+ if (mask != 0) {
+ /*
+ * If any interrupts come in at this point, we want to
+ * make sure that their bits aren't lost by our
+ * putting our bit in. So, this loop accumulates bits
+ * until xchg returns the same value that we put in.
+ * When that happens, there were no new interrupts,
+ * and pending_mask contains a bit for each interrupt
+ * that came in.
+ */
+ old = *mask_out;
+ do {
+ old |= mask;
+ mask = xchg(&pending_mask, old);
+ } while (mask != old);
+ return 1;
+ }
+
+ ti = current_thread_info();
+ nested = (ti->real_thread != NULL);
+ if (!nested) {
+ struct task_struct *task;
+ struct thread_info *tti;
+
+ task = cpu_tasks[ti->cpu].task;
+ tti = task_thread_info(task);
+
+ *ti = *tti;
+ ti->real_thread = tti;
+ task->stack = ti;
+ }
+
+ mask = xchg(&pending_mask, 0);
+ *mask_out |= mask | nested;
+ return 0;
+}
+
+unsigned long from_irq_stack(int nested)
+{
+ struct thread_info *ti, *to;
+ unsigned long mask;
+
+ ti = current_thread_info();
+
+ pending_mask = 1;
+
+ to = ti->real_thread;
+ current->stack = to;
+ ti->real_thread = NULL;
+ *to = *ti;
+
+ mask = xchg(&pending_mask, 0);
+ return mask & ~1;
+}
+
diff --git a/arch/um/kernel/kmsg_dump.c b/arch/um/kernel/kmsg_dump.c
new file mode 100644
index 0000000..407d492
--- /dev/null
+++ b/arch/um/kernel/kmsg_dump.c
@@ -0,0 +1,43 @@
+#include <linux/kmsg_dump.h>
+#include <linux/console.h>
+#include <shared/init.h>
+#include <shared/kern.h>
+#include <os.h>
+
+static void kmsg_dumper_stdout(struct kmsg_dumper *dumper,
+ enum kmsg_dump_reason reason)
+{
+ static char line[1024];
+
+ size_t len = 0;
+ bool con_available = false;
+
+ /* only dump kmsg when no console is available */
+ if (!console_trylock())
+ return;
+
+ if (console_drivers != NULL)
+ con_available = true;
+
+ console_unlock();
+
+ if (con_available == true)
+ return;
+
+ printf("kmsg_dump:\n");
+ while (kmsg_dump_get_line(dumper, true, line, sizeof(line), &len)) {
+ line[len] = '\0';
+ printf("%s", line);
+ }
+}
+
+static struct kmsg_dumper kmsg_dumper = {
+ .dump = kmsg_dumper_stdout
+};
+
+int __init kmsg_dumper_stdout_init(void)
+{
+ return kmsg_dump_register(&kmsg_dumper);
+}
+
+__uml_postsetup(kmsg_dumper_stdout_init);
diff --git a/arch/um/kernel/ksyms.c b/arch/um/kernel/ksyms.c
new file mode 100644
index 0000000..232b223
--- /dev/null
+++ b/arch/um/kernel/ksyms.c
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/module.h>
+#include <os.h>
+
+EXPORT_SYMBOL(set_signals);
+EXPORT_SYMBOL(get_signals);
+
+EXPORT_SYMBOL(os_stat_fd);
+EXPORT_SYMBOL(os_stat_file);
+EXPORT_SYMBOL(os_access);
+EXPORT_SYMBOL(os_set_exec_close);
+EXPORT_SYMBOL(os_getpid);
+EXPORT_SYMBOL(os_open_file);
+EXPORT_SYMBOL(os_read_file);
+EXPORT_SYMBOL(os_write_file);
+EXPORT_SYMBOL(os_seek_file);
+EXPORT_SYMBOL(os_lock_file);
+EXPORT_SYMBOL(os_ioctl_generic);
+EXPORT_SYMBOL(os_pipe);
+EXPORT_SYMBOL(os_file_type);
+EXPORT_SYMBOL(os_file_mode);
+EXPORT_SYMBOL(os_file_size);
+EXPORT_SYMBOL(os_flush_stdout);
+EXPORT_SYMBOL(os_close_file);
+EXPORT_SYMBOL(os_set_fd_async);
+EXPORT_SYMBOL(os_set_fd_block);
+EXPORT_SYMBOL(helper_wait);
+EXPORT_SYMBOL(os_shutdown_socket);
+EXPORT_SYMBOL(os_create_unix_socket);
+EXPORT_SYMBOL(os_connect_socket);
+EXPORT_SYMBOL(os_accept_connection);
+EXPORT_SYMBOL(os_rcv_fd);
+EXPORT_SYMBOL(run_helper);
+EXPORT_SYMBOL(os_major);
+EXPORT_SYMBOL(os_minor);
+EXPORT_SYMBOL(os_makedev);
+
+EXPORT_SYMBOL(add_sigio_fd);
+EXPORT_SYMBOL(ignore_sigio_fd);
+EXPORT_SYMBOL(sigio_broken);
+
+EXPORT_SYMBOL(syscall);
diff --git a/arch/um/kernel/maccess.c b/arch/um/kernel/maccess.c
new file mode 100644
index 0000000..1f3d5c4
--- /dev/null
+++ b/arch/um/kernel/maccess.c
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2013 Richard Weinberger <richrd@nod.at>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/uaccess.h>
+#include <linux/kernel.h>
+#include <os.h>
+
+long probe_kernel_read(void *dst, const void *src, size_t size)
+{
+ void *psrc = (void *)rounddown((unsigned long)src, PAGE_SIZE);
+
+ if ((unsigned long)src < PAGE_SIZE || size <= 0)
+ return -EFAULT;
+
+ if (os_mincore(psrc, size + src - psrc) <= 0)
+ return -EFAULT;
+
+ return __probe_kernel_read(dst, src, size);
+}
diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c
new file mode 100644
index 0000000..b2a2dff
--- /dev/null
+++ b/arch/um/kernel/mem.c
@@ -0,0 +1,240 @@
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/stddef.h>
+#include <linux/module.h>
+#include <linux/bootmem.h>
+#include <linux/highmem.h>
+#include <linux/mm.h>
+#include <linux/swap.h>
+#include <linux/slab.h>
+#include <asm/fixmap.h>
+#include <asm/page.h>
+#include <as-layout.h>
+#include <init.h>
+#include <kern.h>
+#include <kern_util.h>
+#include <mem_user.h>
+#include <os.h>
+
+/* allocated in paging_init, zeroed in mem_init, and unchanged thereafter */
+unsigned long *empty_zero_page = NULL;
+EXPORT_SYMBOL(empty_zero_page);
+/* allocated in paging_init and unchanged thereafter */
+static unsigned long *empty_bad_page = NULL;
+
+/*
+ * Initialized during boot, and readonly for initializing page tables
+ * afterwards
+ */
+pgd_t swapper_pg_dir[PTRS_PER_PGD];
+
+/* Initialized at boot time, and readonly after that */
+unsigned long long highmem;
+int kmalloc_ok = 0;
+
+/* Used during early boot */
+static unsigned long brk_end;
+
+void __init mem_init(void)
+{
+ /* clear the zero-page */
+ memset(empty_zero_page, 0, PAGE_SIZE);
+
+ /* Map in the area just after the brk now that kmalloc is about
+ * to be turned on.
+ */
+ brk_end = (unsigned long) UML_ROUND_UP(sbrk(0));
+ map_memory(brk_end, __pa(brk_end), uml_reserved - brk_end, 1, 1, 0);
+ free_bootmem(__pa(brk_end), uml_reserved - brk_end);
+ uml_reserved = brk_end;
+
+ /* this will put all low memory onto the freelists */
+ free_all_bootmem();
+ max_low_pfn = totalram_pages;
+ max_pfn = totalram_pages;
+ mem_init_print_info(NULL);
+ kmalloc_ok = 1;
+}
+
+/*
+ * Create a page table and place a pointer to it in a middle page
+ * directory entry.
+ */
+static void __init one_page_table_init(pmd_t *pmd)
+{
+ if (pmd_none(*pmd)) {
+ pte_t *pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
+ set_pmd(pmd, __pmd(_KERNPG_TABLE +
+ (unsigned long) __pa(pte)));
+ if (pte != pte_offset_kernel(pmd, 0))
+ BUG();
+ }
+}
+
+static void __init one_md_table_init(pud_t *pud)
+{
+#ifdef CONFIG_3_LEVEL_PGTABLES
+ pmd_t *pmd_table = (pmd_t *) alloc_bootmem_low_pages(PAGE_SIZE);
+ set_pud(pud, __pud(_KERNPG_TABLE + (unsigned long) __pa(pmd_table)));
+ if (pmd_table != pmd_offset(pud, 0))
+ BUG();
+#endif
+}
+
+static void __init fixrange_init(unsigned long start, unsigned long end,
+ pgd_t *pgd_base)
+{
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+ int i, j;
+ unsigned long vaddr;
+
+ vaddr = start;
+ i = pgd_index(vaddr);
+ j = pmd_index(vaddr);
+ pgd = pgd_base + i;
+
+ for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) {
+ pud = pud_offset(pgd, vaddr);
+ if (pud_none(*pud))
+ one_md_table_init(pud);
+ pmd = pmd_offset(pud, vaddr);
+ for (; (j < PTRS_PER_PMD) && (vaddr < end); pmd++, j++) {
+ one_page_table_init(pmd);
+ vaddr += PMD_SIZE;
+ }
+ j = 0;
+ }
+}
+
+static void __init fixaddr_user_init( void)
+{
+#ifdef CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA
+ long size = FIXADDR_USER_END - FIXADDR_USER_START;
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte;
+ phys_t p;
+ unsigned long v, vaddr = FIXADDR_USER_START;
+
+ if (!size)
+ return;
+
+ fixrange_init( FIXADDR_USER_START, FIXADDR_USER_END, swapper_pg_dir);
+ v = (unsigned long) alloc_bootmem_low_pages(size);
+ memcpy((void *) v , (void *) FIXADDR_USER_START, size);
+ p = __pa(v);
+ for ( ; size > 0; size -= PAGE_SIZE, vaddr += PAGE_SIZE,
+ p += PAGE_SIZE) {
+ pgd = swapper_pg_dir + pgd_index(vaddr);
+ pud = pud_offset(pgd, vaddr);
+ pmd = pmd_offset(pud, vaddr);
+ pte = pte_offset_kernel(pmd, vaddr);
+ pte_set_val(*pte, p, PAGE_READONLY);
+ }
+#endif
+}
+
+void __init paging_init(void)
+{
+ unsigned long zones_size[MAX_NR_ZONES], vaddr;
+ int i;
+
+ empty_zero_page = (unsigned long *) alloc_bootmem_low_pages(PAGE_SIZE);
+ empty_bad_page = (unsigned long *) alloc_bootmem_low_pages(PAGE_SIZE);
+ for (i = 0; i < ARRAY_SIZE(zones_size); i++)
+ zones_size[i] = 0;
+
+ zones_size[ZONE_NORMAL] = (end_iomem >> PAGE_SHIFT) -
+ (uml_physmem >> PAGE_SHIFT);
+ free_area_init(zones_size);
+
+ /*
+ * Fixed mappings, only the page table structure has to be
+ * created - mappings will be set by set_fixmap():
+ */
+ vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
+ fixrange_init(vaddr, FIXADDR_TOP, swapper_pg_dir);
+
+ fixaddr_user_init();
+}
+
+/*
+ * This can't do anything because nothing in the kernel image can be freed
+ * since it's not in kernel physical memory.
+ */
+
+void free_initmem(void)
+{
+}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+void free_initrd_mem(unsigned long start, unsigned long end)
+{
+ free_reserved_area((void *)start, (void *)end, -1, "initrd");
+}
+#endif
+
+/* Allocate and free page tables. */
+
+pgd_t *pgd_alloc(struct mm_struct *mm)
+{
+ pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL);
+
+ if (pgd) {
+ memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
+ memcpy(pgd + USER_PTRS_PER_PGD,
+ swapper_pg_dir + USER_PTRS_PER_PGD,
+ (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
+ }
+ return pgd;
+}
+
+void pgd_free(struct mm_struct *mm, pgd_t *pgd)
+{
+ free_page((unsigned long) pgd);
+}
+
+pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
+{
+ pte_t *pte;
+
+ pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO);
+ return pte;
+}
+
+pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
+{
+ struct page *pte;
+
+ pte = alloc_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO);
+ if (!pte)
+ return NULL;
+ if (!pgtable_page_ctor(pte)) {
+ __free_page(pte);
+ return NULL;
+ }
+ return pte;
+}
+
+#ifdef CONFIG_3_LEVEL_PGTABLES
+pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
+{
+ pmd_t *pmd = (pmd_t *) __get_free_page(GFP_KERNEL);
+
+ if (pmd)
+ memset(pmd, 0, PAGE_SIZE);
+
+ return pmd;
+}
+#endif
+
+void *uml_kmalloc(int size, int flags)
+{
+ return kmalloc(size, flags);
+}
diff --git a/arch/um/kernel/physmem.c b/arch/um/kernel/physmem.c
new file mode 100644
index 0000000..4c9861b
--- /dev/null
+++ b/arch/um/kernel/physmem.c
@@ -0,0 +1,224 @@
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/module.h>
+#include <linux/bootmem.h>
+#include <linux/mm.h>
+#include <linux/pfn.h>
+#include <asm/page.h>
+#include <asm/sections.h>
+#include <as-layout.h>
+#include <init.h>
+#include <kern.h>
+#include <mem_user.h>
+#include <os.h>
+
+static int physmem_fd = -1;
+
+/* Changed during early boot */
+unsigned long high_physmem;
+EXPORT_SYMBOL(high_physmem);
+
+extern unsigned long long physmem_size;
+
+void __init mem_total_pages(unsigned long physmem, unsigned long iomem,
+ unsigned long highmem)
+{
+ unsigned long phys_pages, highmem_pages;
+ unsigned long iomem_pages, total_pages;
+
+ phys_pages = physmem >> PAGE_SHIFT;
+ iomem_pages = iomem >> PAGE_SHIFT;
+ highmem_pages = highmem >> PAGE_SHIFT;
+
+ total_pages = phys_pages + iomem_pages + highmem_pages;
+
+ max_mapnr = total_pages;
+}
+
+void map_memory(unsigned long virt, unsigned long phys, unsigned long len,
+ int r, int w, int x)
+{
+ __u64 offset;
+ int fd, err;
+
+ fd = phys_mapping(phys, &offset);
+ err = os_map_memory((void *) virt, fd, offset, len, r, w, x);
+ if (err) {
+ if (err == -ENOMEM)
+ printk(KERN_ERR "try increasing the host's "
+ "/proc/sys/vm/max_map_count to <physical "
+ "memory size>/4096\n");
+ panic("map_memory(0x%lx, %d, 0x%llx, %ld, %d, %d, %d) failed, "
+ "err = %d\n", virt, fd, offset, len, r, w, x, err);
+ }
+}
+
+/**
+ * setup_physmem() - Setup physical memory for UML
+ * @start: Start address of the physical kernel memory,
+ * i.e start address of the executable image.
+ * @reserve_end: end address of the physical kernel memory.
+ * @len: Length of total physical memory that should be mapped/made
+ * available, in bytes.
+ * @highmem: Number of highmem bytes that should be mapped/made available.
+ *
+ * Creates an unlinked temporary file of size (len + highmem) and memory maps
+ * it on the last executable image address (uml_reserved).
+ *
+ * The offset is needed as the length of the total physical memory
+ * (len + highmem) includes the size of the memory used be the executable image,
+ * but the mapped-to address is the last address of the executable image
+ * (uml_reserved == end address of executable image).
+ *
+ * The memory mapped memory of the temporary file is used as backing memory
+ * of all user space processes/kernel tasks.
+ */
+void __init setup_physmem(unsigned long start, unsigned long reserve_end,
+ unsigned long len, unsigned long long highmem)
+{
+ unsigned long reserve = reserve_end - start;
+ unsigned long pfn = PFN_UP(__pa(reserve_end));
+ unsigned long delta = (len - reserve) >> PAGE_SHIFT;
+ unsigned long offset, bootmap_size;
+ long map_size;
+ int err;
+
+ offset = uml_reserved - uml_physmem;
+ map_size = len - offset;
+ if(map_size <= 0) {
+ printf("Too few physical memory! Needed=%d, given=%d\n",
+ offset, len);
+ exit(1);
+ }
+
+ physmem_fd = create_mem_file(len + highmem);
+
+ err = os_map_memory((void *) uml_reserved, physmem_fd, offset,
+ map_size, 1, 1, 1);
+ if (err < 0) {
+ printf("setup_physmem - mapping %ld bytes of memory at 0x%p "
+ "failed - errno = %d\n", map_size,
+ (void *) uml_reserved, err);
+ exit(1);
+ }
+
+ /*
+ * Special kludge - This page will be mapped in to userspace processes
+ * from physmem_fd, so it needs to be written out there.
+ */
+ os_seek_file(physmem_fd, __pa(__syscall_stub_start));
+ os_write_file(physmem_fd, __syscall_stub_start, PAGE_SIZE);
+ os_fsync_file(physmem_fd);
+
+ bootmap_size = init_bootmem(pfn, pfn + delta);
+ free_bootmem(__pa(reserve_end) + bootmap_size,
+ len - bootmap_size - reserve);
+}
+
+int phys_mapping(unsigned long phys, unsigned long long *offset_out)
+{
+ int fd = -1;
+
+ if (phys < physmem_size) {
+ fd = physmem_fd;
+ *offset_out = phys;
+ }
+ else if (phys < __pa(end_iomem)) {
+ struct iomem_region *region = iomem_regions;
+
+ while (region != NULL) {
+ if ((phys >= region->phys) &&
+ (phys < region->phys + region->size)) {
+ fd = region->fd;
+ *offset_out = phys - region->phys;
+ break;
+ }
+ region = region->next;
+ }
+ }
+ else if (phys < __pa(end_iomem) + highmem) {
+ fd = physmem_fd;
+ *offset_out = phys - iomem_size;
+ }
+
+ return fd;
+}
+
+static int __init uml_mem_setup(char *line, int *add)
+{
+ char *retptr;
+ physmem_size = memparse(line,&retptr);
+ return 0;
+}
+__uml_setup("mem=", uml_mem_setup,
+"mem=<Amount of desired ram>\n"
+" This controls how much \"physical\" memory the kernel allocates\n"
+" for the system. The size is specified as a number followed by\n"
+" one of 'k', 'K', 'm', 'M', which have the obvious meanings.\n"
+" This is not related to the amount of memory in the host. It can\n"
+" be more, and the excess, if it's ever used, will just be swapped out.\n"
+" Example: mem=64M\n\n"
+);
+
+extern int __init parse_iomem(char *str, int *add);
+
+__uml_setup("iomem=", parse_iomem,
+"iomem=<name>,<file>\n"
+" Configure <file> as an IO memory region named <name>.\n\n"
+);
+
+/*
+ * This list is constructed in parse_iomem and addresses filled in in
+ * setup_iomem, both of which run during early boot. Afterwards, it's
+ * unchanged.
+ */
+struct iomem_region *iomem_regions;
+
+/* Initialized in parse_iomem and unchanged thereafter */
+int iomem_size;
+
+unsigned long find_iomem(char *driver, unsigned long *len_out)
+{
+ struct iomem_region *region = iomem_regions;
+
+ while (region != NULL) {
+ if (!strcmp(region->driver, driver)) {
+ *len_out = region->size;
+ return region->virt;
+ }
+
+ region = region->next;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(find_iomem);
+
+static int setup_iomem(void)
+{
+ struct iomem_region *region = iomem_regions;
+ unsigned long iomem_start = high_physmem + PAGE_SIZE;
+ int err;
+
+ while (region != NULL) {
+ err = os_map_memory((void *) iomem_start, region->fd, 0,
+ region->size, 1, 1, 0);
+ if (err)
+ printk(KERN_ERR "Mapping iomem region for driver '%s' "
+ "failed, errno = %d\n", region->driver, -err);
+ else {
+ region->virt = iomem_start;
+ region->phys = __pa(region->virt);
+ }
+
+ iomem_start += region->size + PAGE_SIZE;
+ region = region->next;
+ }
+
+ return 0;
+}
+
+__initcall(setup_iomem);
diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
new file mode 100644
index 0000000..48af59a
--- /dev/null
+++ b/arch/um/kernel/process.c
@@ -0,0 +1,407 @@
+/*
+ * Copyright (C) 2015 Anton Ivanov (aivanov@{brocade.com,kot-begemot.co.uk})
+ * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Copyright 2003 PathScale, Inc.
+ * Licensed under the GPL
+ */
+
+#include <linux/stddef.h>
+#include <linux/err.h>
+#include <linux/hardirq.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/personality.h>
+#include <linux/proc_fs.h>
+#include <linux/ptrace.h>
+#include <linux/random.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+#include <linux/seq_file.h>
+#include <linux/tick.h>
+#include <linux/threads.h>
+#include <linux/tracehook.h>
+#include <asm/current.h>
+#include <asm/pgtable.h>
+#include <asm/mmu_context.h>
+#include <asm/uaccess.h>
+#include <as-layout.h>
+#include <kern_util.h>
+#include <os.h>
+#include <skas.h>
+#include <timer-internal.h>
+
+/*
+ * This is a per-cpu array. A processor only modifies its entry and it only
+ * cares about its entry, so it's OK if another processor is modifying its
+ * entry.
+ */
+struct cpu_task cpu_tasks[NR_CPUS] = { [0 ... NR_CPUS - 1] = { -1, NULL } };
+
+static inline int external_pid(void)
+{
+ /* FIXME: Need to look up userspace_pid by cpu */
+ return userspace_pid[0];
+}
+
+int pid_to_processor_id(int pid)
+{
+ int i;
+
+ for (i = 0; i < ncpus; i++) {
+ if (cpu_tasks[i].pid == pid)
+ return i;
+ }
+ return -1;
+}
+
+void free_stack(unsigned long stack, int order)
+{
+ free_pages(stack, order);
+}
+
+unsigned long alloc_stack(int order, int atomic)
+{
+ unsigned long page;
+ gfp_t flags = GFP_KERNEL;
+
+ if (atomic)
+ flags = GFP_ATOMIC;
+ page = __get_free_pages(flags, order);
+
+ return page;
+}
+
+static inline void set_current(struct task_struct *task)
+{
+ cpu_tasks[task_thread_info(task)->cpu] = ((struct cpu_task)
+ { external_pid(), task });
+}
+
+extern void arch_switch_to(struct task_struct *to);
+
+void *__switch_to(struct task_struct *from, struct task_struct *to)
+{
+ to->thread.prev_sched = from;
+ set_current(to);
+
+ switch_threads(&from->thread.switch_buf, &to->thread.switch_buf);
+ arch_switch_to(current);
+
+ return current->thread.prev_sched;
+}
+
+void interrupt_end(void)
+{
+ struct pt_regs *regs = ¤t->thread.regs;
+
+ if (need_resched())
+ schedule();
+ if (test_thread_flag(TIF_SIGPENDING))
+ do_signal(regs);
+ if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME))
+ tracehook_notify_resume(regs);
+}
+
+void exit_thread(void)
+{
+}
+
+int get_current_pid(void)
+{
+ return task_pid_nr(current);
+}
+
+/*
+ * This is called magically, by its address being stuffed in a jmp_buf
+ * and being longjmp-d to.
+ */
+void new_thread_handler(void)
+{
+ int (*fn)(void *), n;
+ void *arg;
+
+ if (current->thread.prev_sched != NULL)
+ schedule_tail(current->thread.prev_sched);
+ current->thread.prev_sched = NULL;
+
+ fn = current->thread.request.u.thread.proc;
+ arg = current->thread.request.u.thread.arg;
+
+ /*
+ * callback returns only if the kernel thread execs a process
+ */
+ n = fn(arg);
+ userspace(¤t->thread.regs.regs);
+}
+
+/* Called magically, see new_thread_handler above */
+void fork_handler(void)
+{
+ force_flush_all();
+
+ schedule_tail(current->thread.prev_sched);
+
+ /*
+ * XXX: if interrupt_end() calls schedule, this call to
+ * arch_switch_to isn't needed. We could want to apply this to
+ * improve performance. -bb
+ */
+ arch_switch_to(current);
+
+ current->thread.prev_sched = NULL;
+
+ userspace(¤t->thread.regs.regs);
+}
+
+int copy_thread(unsigned long clone_flags, unsigned long sp,
+ unsigned long arg, struct task_struct * p)
+{
+ void (*handler)(void);
+ int kthread = current->flags & PF_KTHREAD;
+ int ret = 0;
+
+ p->thread = (struct thread_struct) INIT_THREAD;
+
+ if (!kthread) {
+ memcpy(&p->thread.regs.regs, current_pt_regs(),
+ sizeof(p->thread.regs.regs));
+ PT_REGS_SET_SYSCALL_RETURN(&p->thread.regs, 0);
+ if (sp != 0)
+ REGS_SP(p->thread.regs.regs.gp) = sp;
+
+ handler = fork_handler;
+
+ arch_copy_thread(¤t->thread.arch, &p->thread.arch);
+ } else {
+ get_safe_registers(p->thread.regs.regs.gp, p->thread.regs.regs.fp);
+ p->thread.request.u.thread.proc = (int (*)(void *))sp;
+ p->thread.request.u.thread.arg = (void *)arg;
+ handler = new_thread_handler;
+ }
+
+ new_thread(task_stack_page(p), &p->thread.switch_buf, handler);
+
+ if (!kthread) {
+ clear_flushed_tls(p);
+
+ /*
+ * Set a new TLS for the child thread?
+ */
+ if (clone_flags & CLONE_SETTLS)
+ ret = arch_copy_tls(p);
+ }
+
+ return ret;
+}
+
+void initial_thread_cb(void (*proc)(void *), void *arg)
+{
+ int save_kmalloc_ok = kmalloc_ok;
+
+ kmalloc_ok = 0;
+ initial_thread_cb_skas(proc, arg);
+ kmalloc_ok = save_kmalloc_ok;
+}
+
+void arch_cpu_idle(void)
+{
+ cpu_tasks[current_thread_info()->cpu].pid = os_getpid();
+ os_idle_sleep(UM_NSEC_PER_SEC);
+ local_irq_enable();
+}
+
+int __cant_sleep(void) {
+ return in_atomic() || irqs_disabled() || in_interrupt();
+ /* Is in_interrupt() really needed? */
+}
+
+int user_context(unsigned long sp)
+{
+ unsigned long stack;
+
+ stack = sp & (PAGE_MASK << CONFIG_KERNEL_STACK_ORDER);
+ return stack != (unsigned long) current_thread_info();
+}
+
+extern exitcall_t __uml_exitcall_begin, __uml_exitcall_end;
+
+void do_uml_exitcalls(void)
+{
+ exitcall_t *call;
+
+ call = &__uml_exitcall_end;
+ while (--call >= &__uml_exitcall_begin)
+ (*call)();
+}
+
+char *uml_strdup(const char *string)
+{
+ return kstrdup(string, GFP_KERNEL);
+}
+EXPORT_SYMBOL(uml_strdup);
+
+int copy_to_user_proc(void __user *to, void *from, int size)
+{
+ return copy_to_user(to, from, size);
+}
+
+int copy_from_user_proc(void *to, void __user *from, int size)
+{
+ return copy_from_user(to, from, size);
+}
+
+int clear_user_proc(void __user *buf, int size)
+{
+ return clear_user(buf, size);
+}
+
+int strlen_user_proc(char __user *str)
+{
+ return strlen_user(str);
+}
+
+int cpu(void)
+{
+ return current_thread_info()->cpu;
+}
+
+static atomic_t using_sysemu = ATOMIC_INIT(0);
+int sysemu_supported;
+
+void set_using_sysemu(int value)
+{
+ if (value > sysemu_supported)
+ return;
+ atomic_set(&using_sysemu, value);
+}
+
+int get_using_sysemu(void)
+{
+ return atomic_read(&using_sysemu);
+}
+
+static int sysemu_proc_show(struct seq_file *m, void *v)
+{
+ seq_printf(m, "%d\n", get_using_sysemu());
+ return 0;
+}
+
+static int sysemu_proc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, sysemu_proc_show, NULL);
+}
+
+static ssize_t sysemu_proc_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *pos)
+{
+ char tmp[2];
+
+ if (copy_from_user(tmp, buf, 1))
+ return -EFAULT;
+
+ if (tmp[0] >= '0' && tmp[0] <= '2')
+ set_using_sysemu(tmp[0] - '0');
+ /* We use the first char, but pretend to write everything */
+ return count;
+}
+
+static const struct file_operations sysemu_proc_fops = {
+ .owner = THIS_MODULE,
+ .open = sysemu_proc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+ .write = sysemu_proc_write,
+};
+
+int __init make_proc_sysemu(void)
+{
+ struct proc_dir_entry *ent;
+ if (!sysemu_supported)
+ return 0;
+
+ ent = proc_create("sysemu", 0600, NULL, &sysemu_proc_fops);
+
+ if (ent == NULL)
+ {
+ printk(KERN_WARNING "Failed to register /proc/sysemu\n");
+ return 0;
+ }
+
+ return 0;
+}
+
+late_initcall(make_proc_sysemu);
+
+int singlestepping(void * t)
+{
+ struct task_struct *task = t ? t : current;
+
+ if (!(task->ptrace & PT_DTRACE))
+ return 0;
+
+ if (task->thread.singlestep_syscall)
+ return 1;
+
+ return 2;
+}
+
+/*
+ * Only x86 and x86_64 have an arch_align_stack().
+ * All other arches have "#define arch_align_stack(x) (x)"
+ * in their asm/exec.h
+ * As this is included in UML from asm-um/system-generic.h,
+ * we can use it to behave as the subarch does.
+ */
+#ifndef arch_align_stack
+unsigned long arch_align_stack(unsigned long sp)
+{
+ if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
+ sp -= get_random_int() % 8192;
+ return sp & ~0xf;
+}
+#endif
+
+unsigned long get_wchan(struct task_struct *p)
+{
+ unsigned long stack_page, sp, ip;
+ bool seen_sched = 0;
+
+ if ((p == NULL) || (p == current) || (p->state == TASK_RUNNING))
+ return 0;
+
+ stack_page = (unsigned long) task_stack_page(p);
+ /* Bail if the process has no kernel stack for some reason */
+ if (stack_page == 0)
+ return 0;
+
+ sp = p->thread.switch_buf->JB_SP;
+ /*
+ * Bail if the stack pointer is below the bottom of the kernel
+ * stack for some reason
+ */
+ if (sp < stack_page)
+ return 0;
+
+ while (sp < stack_page + THREAD_SIZE) {
+ ip = *((unsigned long *) sp);
+ if (in_sched_functions(ip))
+ /* Ignore everything until we're above the scheduler */
+ seen_sched = 1;
+ else if (kernel_text_address(ip) && seen_sched)
+ return ip;
+
+ sp += sizeof(unsigned long);
+ }
+
+ return 0;
+}
+
+int elf_core_copy_fpregs(struct task_struct *t, elf_fpregset_t *fpu)
+{
+ int cpu = current_thread_info()->cpu;
+
+ return save_fp_registers(userspace_pid[cpu], (unsigned long *) fpu);
+}
+
diff --git a/arch/um/kernel/ptrace.c b/arch/um/kernel/ptrace.c
new file mode 100644
index 0000000..6a826cb
--- /dev/null
+++ b/arch/um/kernel/ptrace.c
@@ -0,0 +1,166 @@
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/audit.h>
+#include <linux/ptrace.h>
+#include <linux/sched.h>
+#include <linux/tracehook.h>
+#include <asm/uaccess.h>
+#include <asm/ptrace-abi.h>
+
+void user_enable_single_step(struct task_struct *child)
+{
+ child->ptrace |= PT_DTRACE;
+ child->thread.singlestep_syscall = 0;
+
+#ifdef SUBARCH_SET_SINGLESTEPPING
+ SUBARCH_SET_SINGLESTEPPING(child, 1);
+#endif
+}
+
+void user_disable_single_step(struct task_struct *child)
+{
+ child->ptrace &= ~PT_DTRACE;
+ child->thread.singlestep_syscall = 0;
+
+#ifdef SUBARCH_SET_SINGLESTEPPING
+ SUBARCH_SET_SINGLESTEPPING(child, 0);
+#endif
+}
+
+/*
+ * Called by kernel/ptrace.c when detaching..
+ */
+void ptrace_disable(struct task_struct *child)
+{
+ user_disable_single_step(child);
+}
+
+extern int peek_user(struct task_struct * child, long addr, long data);
+extern int poke_user(struct task_struct * child, long addr, long data);
+
+long arch_ptrace(struct task_struct *child, long request,
+ unsigned long addr, unsigned long data)
+{
+ int i, ret;
+ unsigned long __user *p = (void __user *)data;
+ void __user *vp = p;
+
+ switch (request) {
+ /* read the word at location addr in the USER area. */
+ case PTRACE_PEEKUSR:
+ ret = peek_user(child, addr, data);
+ break;
+
+ /* write the word at location addr in the USER area */
+ case PTRACE_POKEUSR:
+ ret = poke_user(child, addr, data);
+ break;
+
+ case PTRACE_SYSEMU:
+ case PTRACE_SYSEMU_SINGLESTEP:
+ ret = -EIO;
+ break;
+
+#ifdef PTRACE_GETREGS
+ case PTRACE_GETREGS: { /* Get all gp regs from the child. */
+ if (!access_ok(VERIFY_WRITE, p, MAX_REG_OFFSET)) {
+ ret = -EIO;
+ break;
+ }
+ for ( i = 0; i < MAX_REG_OFFSET; i += sizeof(long) ) {
+ __put_user(getreg(child, i), p);
+ p++;
+ }
+ ret = 0;
+ break;
+ }
+#endif
+#ifdef PTRACE_SETREGS
+ case PTRACE_SETREGS: { /* Set all gp regs in the child. */
+ unsigned long tmp = 0;
+ if (!access_ok(VERIFY_READ, p, MAX_REG_OFFSET)) {
+ ret = -EIO;
+ break;
+ }
+ for ( i = 0; i < MAX_REG_OFFSET; i += sizeof(long) ) {
+ __get_user(tmp, p);
+ putreg(child, i, tmp);
+ p++;
+ }
+ ret = 0;
+ break;
+ }
+#endif
+ case PTRACE_GET_THREAD_AREA:
+ ret = ptrace_get_thread_area(child, addr, vp);
+ break;
+
+ case PTRACE_SET_THREAD_AREA:
+ ret = ptrace_set_thread_area(child, addr, vp);
+ break;
+
+ default:
+ ret = ptrace_request(child, request, addr, data);
+ if (ret == -EIO)
+ ret = subarch_ptrace(child, request, addr, data);
+ break;
+ }
+
+ return ret;
+}
+
+static void send_sigtrap(struct task_struct *tsk, struct uml_pt_regs *regs,
+ int error_code)
+{
+ struct siginfo info;
+
+ memset(&info, 0, sizeof(info));
+ info.si_signo = SIGTRAP;
+ info.si_code = TRAP_BRKPT;
+
+ /* User-mode eip? */
+ info.si_addr = UPT_IS_USER(regs) ? (void __user *) UPT_IP(regs) : NULL;
+
+ /* Send us the fake SIGTRAP */
+ force_sig_info(SIGTRAP, &info, tsk);
+}
+
+/*
+ * XXX Check PT_DTRACE vs TIF_SINGLESTEP for singlestepping check and
+ * PT_PTRACED vs TIF_SYSCALL_TRACE for syscall tracing check
+ */
+int syscall_trace_enter(struct pt_regs *regs)
+{
+ audit_syscall_entry(UPT_SYSCALL_NR(®s->regs),
+ UPT_SYSCALL_ARG1(®s->regs),
+ UPT_SYSCALL_ARG2(®s->regs),
+ UPT_SYSCALL_ARG3(®s->regs),
+ UPT_SYSCALL_ARG4(®s->regs));
+
+ if (!test_thread_flag(TIF_SYSCALL_TRACE))
+ return 0;
+
+ return tracehook_report_syscall_entry(regs);
+}
+
+void syscall_trace_leave(struct pt_regs *regs)
+{
+ int ptraced = current->ptrace;
+
+ audit_syscall_exit(regs);
+
+ /* Fake a debug trap */
+ if (ptraced & PT_DTRACE)
+ send_sigtrap(current, ®s->regs, 0);
+
+ if (!test_thread_flag(TIF_SYSCALL_TRACE))
+ return;
+
+ tracehook_report_syscall_exit(regs, 0);
+ /* force do_signal() --> is_syscall() */
+ if (ptraced & PT_PTRACED)
+ set_thread_flag(TIF_SIGPENDING);
+}
diff --git a/arch/um/kernel/reboot.c b/arch/um/kernel/reboot.c
new file mode 100644
index 0000000..9bdf67a
--- /dev/null
+++ b/arch/um/kernel/reboot.c
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/oom.h>
+#include <kern_util.h>
+#include <os.h>
+#include <skas.h>
+
+void (*pm_power_off)(void);
+
+static void kill_off_processes(void)
+{
+ struct task_struct *p;
+ int pid;
+
+ read_lock(&tasklist_lock);
+ for_each_process(p) {
+ struct task_struct *t;
+
+ t = find_lock_task_mm(p);
+ if (!t)
+ continue;
+ pid = t->mm->context.id.u.pid;
+ task_unlock(t);
+ os_kill_ptraced_process(pid, 1);
+ }
+ read_unlock(&tasklist_lock);
+}
+
+void uml_cleanup(void)
+{
+ kmalloc_ok = 0;
+ do_uml_exitcalls();
+ kill_off_processes();
+}
+
+void machine_restart(char * __unused)
+{
+ uml_cleanup();
+ reboot_skas();
+}
+
+void machine_power_off(void)
+{
+ uml_cleanup();
+ halt_skas();
+}
+
+void machine_halt(void)
+{
+ machine_power_off();
+}
diff --git a/arch/um/kernel/sigio.c b/arch/um/kernel/sigio.c
new file mode 100644
index 0000000..b5e0cbb
--- /dev/null
+++ b/arch/um/kernel/sigio.c
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/interrupt.h>
+#include <irq_kern.h>
+#include <os.h>
+#include <sigio.h>
+
+/* Protected by sigio_lock() called from write_sigio_workaround */
+static int sigio_irq_fd = -1;
+
+static irqreturn_t sigio_interrupt(int irq, void *data)
+{
+ char c;
+
+ os_read_file(sigio_irq_fd, &c, sizeof(c));
+ reactivate_fd(sigio_irq_fd, SIGIO_WRITE_IRQ);
+ return IRQ_HANDLED;
+}
+
+int write_sigio_irq(int fd)
+{
+ int err;
+
+ err = um_request_irq(SIGIO_WRITE_IRQ, fd, IRQ_READ, sigio_interrupt,
+ 0, "write sigio", NULL);
+ if (err) {
+ printk(KERN_ERR "write_sigio_irq : um_request_irq failed, "
+ "err = %d\n", err);
+ return -1;
+ }
+ sigio_irq_fd = fd;
+ return 0;
+}
+
+/* These are called from os-Linux/sigio.c to protect its pollfds arrays. */
+static DEFINE_SPINLOCK(sigio_spinlock);
+
+void sigio_lock(void)
+{
+ spin_lock(&sigio_spinlock);
+}
+
+void sigio_unlock(void)
+{
+ spin_unlock(&sigio_spinlock);
+}
diff --git a/arch/um/kernel/signal.c b/arch/um/kernel/signal.c
new file mode 100644
index 0000000..fc8be0e
--- /dev/null
+++ b/arch/um/kernel/signal.c
@@ -0,0 +1,113 @@
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/module.h>
+#include <linux/ptrace.h>
+#include <linux/sched.h>
+#include <asm/siginfo.h>
+#include <asm/signal.h>
+#include <asm/unistd.h>
+#include <frame_kern.h>
+#include <kern_util.h>
+
+EXPORT_SYMBOL(block_signals);
+EXPORT_SYMBOL(unblock_signals);
+
+/*
+ * OK, we're invoking a handler
+ */
+static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
+{
+ sigset_t *oldset = sigmask_to_save();
+ int singlestep = 0;
+ unsigned long sp;
+ int err;
+
+ if ((current->ptrace & PT_DTRACE) && (current->ptrace & PT_PTRACED))
+ singlestep = 1;
+
+ /* Did we come from a system call? */
+ if (PT_REGS_SYSCALL_NR(regs) >= 0) {
+ /* If so, check system call restarting.. */
+ switch (PT_REGS_SYSCALL_RET(regs)) {
+ case -ERESTART_RESTARTBLOCK:
+ case -ERESTARTNOHAND:
+ PT_REGS_SYSCALL_RET(regs) = -EINTR;
+ break;
+
+ case -ERESTARTSYS:
+ if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
+ PT_REGS_SYSCALL_RET(regs) = -EINTR;
+ break;
+ }
+ /* fallthrough */
+ case -ERESTARTNOINTR:
+ PT_REGS_RESTART_SYSCALL(regs);
+ PT_REGS_ORIG_SYSCALL(regs) = PT_REGS_SYSCALL_NR(regs);
+ break;
+ }
+ }
+
+ sp = PT_REGS_SP(regs);
+ if ((ksig->ka.sa.sa_flags & SA_ONSTACK) && (sas_ss_flags(sp) == 0))
+ sp = current->sas_ss_sp + current->sas_ss_size;
+
+#ifdef CONFIG_ARCH_HAS_SC_SIGNALS
+ if (!(ksig->ka.sa.sa_flags & SA_SIGINFO))
+ err = setup_signal_stack_sc(sp, ksig, regs, oldset);
+ else
+#endif
+ err = setup_signal_stack_si(sp, ksig, regs, oldset);
+
+ signal_setup_done(err, ksig, singlestep);
+}
+
+void do_signal(struct pt_regs *regs)
+{
+ struct ksignal ksig;
+ int handled_sig = 0;
+
+ if (get_signal(&ksig)) {
+ handled_sig = 1;
+ /* Whee! Actually deliver the signal. */
+ handle_signal(&ksig, regs);
+ }
+
+ /* Did we come from a system call? */
+ if (!handled_sig && (PT_REGS_SYSCALL_NR(regs) >= 0)) {
+ /* Restart the system call - no handlers present */
+ switch (PT_REGS_SYSCALL_RET(regs)) {
+ case -ERESTARTNOHAND:
+ case -ERESTARTSYS:
+ case -ERESTARTNOINTR:
+ PT_REGS_ORIG_SYSCALL(regs) = PT_REGS_SYSCALL_NR(regs);
+ PT_REGS_RESTART_SYSCALL(regs);
+ break;
+ case -ERESTART_RESTARTBLOCK:
+ PT_REGS_ORIG_SYSCALL(regs) = __NR_restart_syscall;
+ PT_REGS_RESTART_SYSCALL(regs);
+ break;
+ }
+ }
+
+ /*
+ * This closes a way to execute a system call on the host. If
+ * you set a breakpoint on a system call instruction and singlestep
+ * from it, the tracing thread used to PTRACE_SINGLESTEP the process
+ * rather than PTRACE_SYSCALL it, allowing the system call to execute
+ * on the host. The tracing thread will check this flag and
+ * PTRACE_SYSCALL if necessary.
+ */
+ if (current->ptrace & PT_DTRACE)
+ current->thread.singlestep_syscall =
+ is_syscall(PT_REGS_IP(¤t->thread.regs));
+
+ /*
+ * if there's no signal to deliver, we just put the saved sigmask
+ * back
+ */
+ if (!handled_sig)
+ restore_saved_sigmask();
+}
diff --git a/arch/um/kernel/skas/Makefile b/arch/um/kernel/skas/Makefile
new file mode 100644
index 0000000..0b76d88
--- /dev/null
+++ b/arch/um/kernel/skas/Makefile
@@ -0,0 +1,15 @@
+#
+# Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+# Licensed under the GPL
+#
+
+obj-y := clone.o mmu.o process.o syscall.o uaccess.o
+
+# clone.o is in the stub, so it can't be built with profiling
+# GCC hardened also auto-enables -fpic, but we need %ebx so it can't work ->
+# disable it
+
+CFLAGS_clone.o := $(CFLAGS_NO_HARDENING)
+UNPROFILE_OBJS := clone.o
+
+include arch/um/scripts/Makefile.rules
diff --git a/arch/um/kernel/skas/clone.c b/arch/um/kernel/skas/clone.c
new file mode 100644
index 0000000..0f25d41
--- /dev/null
+++ b/arch/um/kernel/skas/clone.c
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
+ * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <signal.h>
+#include <sched.h>
+#include <asm/unistd.h>
+#include <sys/time.h>
+#include <as-layout.h>
+#include <ptrace_user.h>
+#include <stub-data.h>
+#include <sysdep/stub.h>
+
+/*
+ * This is in a separate file because it needs to be compiled with any
+ * extraneous gcc flags (-pg, -fprofile-arcs, -ftest-coverage) disabled
+ *
+ * Use UM_KERN_PAGE_SIZE instead of PAGE_SIZE because that calls getpagesize
+ * on some systems.
+ */
+
+void __attribute__ ((__section__ (".__syscall_stub")))
+stub_clone_handler(void)
+{
+ struct stub_data *data = (struct stub_data *) STUB_DATA;
+ long err;
+
+ err = stub_syscall2(__NR_clone, CLONE_PARENT | CLONE_FILES | SIGCHLD,
+ STUB_DATA + UM_KERN_PAGE_SIZE / 2 - sizeof(void *));
+ if (err != 0)
+ goto out;
+
+ err = stub_syscall4(__NR_ptrace, PTRACE_TRACEME, 0, 0, 0);
+ if (err)
+ goto out;
+
+ remap_stack(data->fd, data->offset);
+ goto done;
+
+ out:
+ /*
+ * save current result.
+ * Parent: pid;
+ * child: retcode of mmap already saved and it jumps around this
+ * assignment
+ */
+ data->err = err;
+ done:
+ trap_myself();
+}
diff --git a/arch/um/kernel/skas/mmu.c b/arch/um/kernel/skas/mmu.c
new file mode 100644
index 0000000..9591a66
--- /dev/null
+++ b/arch/um/kernel/skas/mmu.c
@@ -0,0 +1,158 @@
+/*
+ * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <asm/pgalloc.h>
+#include <asm/pgtable.h>
+#include <asm/sections.h>
+#include <as-layout.h>
+#include <os.h>
+#include <skas.h>
+
+static int init_stub_pte(struct mm_struct *mm, unsigned long proc,
+ unsigned long kernel)
+{
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte;
+
+ pgd = pgd_offset(mm, proc);
+ pud = pud_alloc(mm, pgd, proc);
+ if (!pud)
+ goto out;
+
+ pmd = pmd_alloc(mm, pud, proc);
+ if (!pmd)
+ goto out_pmd;
+
+ pte = pte_alloc_map(mm, NULL, pmd, proc);
+ if (!pte)
+ goto out_pte;
+
+ *pte = mk_pte(virt_to_page(kernel), __pgprot(_PAGE_PRESENT));
+ *pte = pte_mkread(*pte);
+ return 0;
+
+ out_pte:
+ pmd_free(mm, pmd);
+ out_pmd:
+ pud_free(mm, pud);
+ out:
+ return -ENOMEM;
+}
+
+int init_new_context(struct task_struct *task, struct mm_struct *mm)
+{
+ struct mm_context *from_mm = NULL;
+ struct mm_context *to_mm = &mm->context;
+ unsigned long stack = 0;
+ int ret = -ENOMEM;
+
+ stack = get_zeroed_page(GFP_KERNEL);
+ if (stack == 0)
+ goto out;
+
+ to_mm->id.stack = stack;
+ if (current->mm != NULL && current->mm != &init_mm)
+ from_mm = ¤t->mm->context;
+
+ block_signals();
+ if (from_mm)
+ to_mm->id.u.pid = copy_context_skas0(stack,
+ from_mm->id.u.pid);
+ else to_mm->id.u.pid = start_userspace(stack);
+ unblock_signals();
+
+ if (to_mm->id.u.pid < 0) {
+ ret = to_mm->id.u.pid;
+ goto out_free;
+ }
+
+ ret = init_new_ldt(to_mm, from_mm);
+ if (ret < 0) {
+ printk(KERN_ERR "init_new_context_skas - init_ldt"
+ " failed, errno = %d\n", ret);
+ goto out_free;
+ }
+
+ return 0;
+
+ out_free:
+ if (to_mm->id.stack != 0)
+ free_page(to_mm->id.stack);
+ out:
+ return ret;
+}
+
+void uml_setup_stubs(struct mm_struct *mm)
+{
+ int err, ret;
+
+ ret = init_stub_pte(mm, STUB_CODE,
+ (unsigned long) __syscall_stub_start);
+ if (ret)
+ goto out;
+
+ ret = init_stub_pte(mm, STUB_DATA, mm->context.id.stack);
+ if (ret)
+ goto out;
+
+ mm->context.stub_pages[0] = virt_to_page(__syscall_stub_start);
+ mm->context.stub_pages[1] = virt_to_page(mm->context.id.stack);
+
+ /* dup_mmap already holds mmap_sem */
+ err = install_special_mapping(mm, STUB_START, STUB_END - STUB_START,
+ VM_READ | VM_MAYREAD | VM_EXEC |
+ VM_MAYEXEC | VM_DONTCOPY | VM_PFNMAP,
+ mm->context.stub_pages);
+ if (err) {
+ printk(KERN_ERR "install_special_mapping returned %d\n", err);
+ goto out;
+ }
+ return;
+
+out:
+ force_sigsegv(SIGSEGV, current);
+}
+
+void arch_exit_mmap(struct mm_struct *mm)
+{
+ pte_t *pte;
+
+ pte = virt_to_pte(mm, STUB_CODE);
+ if (pte != NULL)
+ pte_clear(mm, STUB_CODE, pte);
+
+ pte = virt_to_pte(mm, STUB_DATA);
+ if (pte == NULL)
+ return;
+
+ pte_clear(mm, STUB_DATA, pte);
+}
+
+void destroy_context(struct mm_struct *mm)
+{
+ struct mm_context *mmu = &mm->context;
+
+ /*
+ * If init_new_context wasn't called, this will be
+ * zero, resulting in a kill(0), which will result in the
+ * whole UML suddenly dying. Also, cover negative and
+ * 1 cases, since they shouldn't happen either.
+ */
+ if (mmu->id.u.pid < 2) {
+ printk(KERN_ERR "corrupt mm_context - pid = %d\n",
+ mmu->id.u.pid);
+ return;
+ }
+ os_kill_ptraced_process(mmu->id.u.pid, 1);
+
+ free_page(mmu->id.stack);
+ free_ldt(mmu);
+}
diff --git a/arch/um/kernel/skas/process.c b/arch/um/kernel/skas/process.c
new file mode 100644
index 0000000..527fa58
--- /dev/null
+++ b/arch/um/kernel/skas/process.c
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <as-layout.h>
+#include <kern.h>
+#include <os.h>
+#include <skas.h>
+
+extern void start_kernel(void);
+
+static int __init start_kernel_proc(void *unused)
+{
+ int pid;
+
+ block_signals();
+ pid = os_getpid();
+
+ cpu_tasks[0].pid = pid;
+ cpu_tasks[0].task = current;
+
+ start_kernel();
+ return 0;
+}
+
+extern int userspace_pid[];
+
+extern char cpu0_irqstack[];
+
+int __init start_uml(void)
+{
+ stack_protections((unsigned long) &cpu0_irqstack);
+ set_sigstack(cpu0_irqstack, THREAD_SIZE);
+
+ init_new_thread_signals();
+
+ init_task.thread.request.u.thread.proc = start_kernel_proc;
+ init_task.thread.request.u.thread.arg = NULL;
+ return start_idle_thread(task_stack_page(&init_task),
+ &init_task.thread.switch_buf);
+}
+
+unsigned long current_stub_stack(void)
+{
+ if (current->mm == NULL)
+ return 0;
+
+ return current->mm->context.id.stack;
+}
diff --git a/arch/um/kernel/skas/syscall.c b/arch/um/kernel/skas/syscall.c
new file mode 100644
index 0000000..1683b8e
--- /dev/null
+++ b/arch/um/kernel/skas/syscall.c
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/kernel.h>
+#include <linux/ptrace.h>
+#include <kern_util.h>
+#include <sysdep/ptrace.h>
+#include <sysdep/syscalls.h>
+#include <os.h>
+
+void handle_syscall(struct uml_pt_regs *r)
+{
+ struct pt_regs *regs = container_of(r, struct pt_regs, regs);
+ long result;
+ int syscall;
+
+ if (syscall_trace_enter(regs)) {
+ result = -ENOSYS;
+ goto out;
+ }
+
+ syscall = get_syscall(r);
+
+ if ((syscall > __NR_syscall_max) || syscall < 0)
+ result = -ENOSYS;
+ else
+ result = EXECUTE_SYSCALL(syscall, regs);
+
+out:
+ PT_REGS_SET_SYSCALL_RETURN(regs, result);
+
+ syscall_trace_leave(regs);
+}
diff --git a/arch/um/kernel/skas/uaccess.c b/arch/um/kernel/skas/uaccess.c
new file mode 100644
index 0000000..85ac8ad
--- /dev/null
+++ b/arch/um/kernel/skas/uaccess.c
@@ -0,0 +1,246 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/err.h>
+#include <linux/highmem.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <asm/current.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <kern_util.h>
+#include <os.h>
+
+pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr)
+{
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+
+ if (mm == NULL)
+ return NULL;
+
+ pgd = pgd_offset(mm, addr);
+ if (!pgd_present(*pgd))
+ return NULL;
+
+ pud = pud_offset(pgd, addr);
+ if (!pud_present(*pud))
+ return NULL;
+
+ pmd = pmd_offset(pud, addr);
+ if (!pmd_present(*pmd))
+ return NULL;
+
+ return pte_offset_kernel(pmd, addr);
+}
+
+static pte_t *maybe_map(unsigned long virt, int is_write)
+{
+ pte_t *pte = virt_to_pte(current->mm, virt);
+ int err, dummy_code;
+
+ if ((pte == NULL) || !pte_present(*pte) ||
+ (is_write && !pte_write(*pte))) {
+ err = handle_page_fault(virt, 0, is_write, 1, &dummy_code);
+ if (err)
+ return NULL;
+ pte = virt_to_pte(current->mm, virt);
+ }
+ if (!pte_present(*pte))
+ pte = NULL;
+
+ return pte;
+}
+
+static int do_op_one_page(unsigned long addr, int len, int is_write,
+ int (*op)(unsigned long addr, int len, void *arg), void *arg)
+{
+ jmp_buf buf;
+ struct page *page;
+ pte_t *pte;
+ int n, faulted;
+
+ pte = maybe_map(addr, is_write);
+ if (pte == NULL)
+ return -1;
+
+ page = pte_page(*pte);
+ addr = (unsigned long) kmap_atomic(page) +
+ (addr & ~PAGE_MASK);
+
+ current->thread.fault_catcher = &buf;
+
+ faulted = UML_SETJMP(&buf);
+ if (faulted == 0)
+ n = (*op)(addr, len, arg);
+ else
+ n = -1;
+
+ current->thread.fault_catcher = NULL;
+
+ kunmap_atomic((void *)addr);
+
+ return n;
+}
+
+static long buffer_op(unsigned long addr, int len, int is_write,
+ int (*op)(unsigned long, int, void *), void *arg)
+{
+ long size, remain, n;
+
+ size = min(PAGE_ALIGN(addr) - addr, (unsigned long) len);
+ remain = len;
+
+ n = do_op_one_page(addr, size, is_write, op, arg);
+ if (n != 0) {
+ remain = (n < 0 ? remain : 0);
+ goto out;
+ }
+
+ addr += size;
+ remain -= size;
+ if (remain == 0)
+ goto out;
+
+ while (addr < ((addr + remain) & PAGE_MASK)) {
+ n = do_op_one_page(addr, PAGE_SIZE, is_write, op, arg);
+ if (n != 0) {
+ remain = (n < 0 ? remain : 0);
+ goto out;
+ }
+
+ addr += PAGE_SIZE;
+ remain -= PAGE_SIZE;
+ }
+ if (remain == 0)
+ goto out;
+
+ n = do_op_one_page(addr, remain, is_write, op, arg);
+ if (n != 0) {
+ remain = (n < 0 ? remain : 0);
+ goto out;
+ }
+
+ return 0;
+ out:
+ return remain;
+}
+
+static int copy_chunk_from_user(unsigned long from, int len, void *arg)
+{
+ unsigned long *to_ptr = arg, to = *to_ptr;
+
+ memcpy((void *) to, (void *) from, len);
+ *to_ptr += len;
+ return 0;
+}
+
+long __copy_from_user(void *to, const void __user *from, unsigned long n)
+{
+ if (segment_eq(get_fs(), KERNEL_DS)) {
+ memcpy(to, (__force void*)from, n);
+ return 0;
+ }
+
+ return buffer_op((unsigned long) from, n, 0, copy_chunk_from_user, &to);
+}
+EXPORT_SYMBOL(__copy_from_user);
+
+static int copy_chunk_to_user(unsigned long to, int len, void *arg)
+{
+ unsigned long *from_ptr = arg, from = *from_ptr;
+
+ memcpy((void *) to, (void *) from, len);
+ *from_ptr += len;
+ return 0;
+}
+
+long __copy_to_user(void __user *to, const void *from, unsigned long n)
+{
+ if (segment_eq(get_fs(), KERNEL_DS)) {
+ memcpy((__force void *) to, from, n);
+ return 0;
+ }
+
+ return buffer_op((unsigned long) to, n, 1, copy_chunk_to_user, &from);
+}
+EXPORT_SYMBOL(__copy_to_user);
+
+static int strncpy_chunk_from_user(unsigned long from, int len, void *arg)
+{
+ char **to_ptr = arg, *to = *to_ptr;
+ int n;
+
+ strncpy(to, (void *) from, len);
+ n = strnlen(to, len);
+ *to_ptr += n;
+
+ if (n < len)
+ return 1;
+ return 0;
+}
+
+long __strncpy_from_user(char *dst, const char __user *src, long count)
+{
+ long n;
+ char *ptr = dst;
+
+ if (segment_eq(get_fs(), KERNEL_DS)) {
+ strncpy(dst, (__force void *) src, count);
+ return strnlen(dst, count);
+ }
+
+ n = buffer_op((unsigned long) src, count, 0, strncpy_chunk_from_user,
+ &ptr);
+ if (n != 0)
+ return -EFAULT;
+ return strnlen(dst, count);
+}
+EXPORT_SYMBOL(__strncpy_from_user);
+
+static int clear_chunk(unsigned long addr, int len, void *unused)
+{
+ memset((void *) addr, 0, len);
+ return 0;
+}
+
+unsigned long __clear_user(void __user *mem, unsigned long len)
+{
+ if (segment_eq(get_fs(), KERNEL_DS)) {
+ memset((__force void*)mem, 0, len);
+ return 0;
+ }
+
+ return buffer_op((unsigned long) mem, len, 1, clear_chunk, NULL);
+}
+EXPORT_SYMBOL(__clear_user);
+
+static int strnlen_chunk(unsigned long str, int len, void *arg)
+{
+ int *len_ptr = arg, n;
+
+ n = strnlen((void *) str, len);
+ *len_ptr += n;
+
+ if (n < len)
+ return 1;
+ return 0;
+}
+
+long __strnlen_user(const void __user *str, long len)
+{
+ int count = 0, n;
+
+ if (segment_eq(get_fs(), KERNEL_DS))
+ return strnlen((__force char*)str, len) + 1;
+
+ n = buffer_op((unsigned long) str, len, 0, strnlen_chunk, &count);
+ if (n == 0)
+ return count + 1;
+ return 0;
+}
+EXPORT_SYMBOL(__strnlen_user);
diff --git a/arch/um/kernel/stacktrace.c b/arch/um/kernel/stacktrace.c
new file mode 100644
index 0000000..ebe7bcf
--- /dev/null
+++ b/arch/um/kernel/stacktrace.c
@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Copyright (C) 2013 Richard Weinberger <richard@nod.at>
+ * Copyright (C) 2014 Google Inc., Author: Daniel Walter <dwalter@google.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kallsyms.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/stacktrace.h>
+#include <linux/module.h>
+#include <linux/uaccess.h>
+#include <asm/stacktrace.h>
+
+void dump_trace(struct task_struct *tsk,
+ const struct stacktrace_ops *ops,
+ void *data)
+{
+ int reliable = 0;
+ unsigned long *sp, bp, addr;
+ struct pt_regs *segv_regs = tsk->thread.segv_regs;
+ struct stack_frame *frame;
+
+ bp = get_frame_pointer(tsk, segv_regs);
+ sp = get_stack_pointer(tsk, segv_regs);
+
+ frame = (struct stack_frame *)bp;
+ while (((long) sp & (THREAD_SIZE-1)) != 0) {
+ addr = *sp;
+ if (__kernel_text_address(addr)) {
+ reliable = 0;
+ if ((unsigned long) sp == bp + sizeof(long)) {
+ frame = frame ? frame->next_frame : NULL;
+ bp = (unsigned long)frame;
+ reliable = 1;
+ }
+ ops->address(data, addr, reliable);
+ }
+ sp++;
+ }
+}
+
+static void save_addr(void *data, unsigned long address, int reliable)
+{
+ struct stack_trace *trace = data;
+
+ if (!reliable)
+ return;
+ if (trace->nr_entries >= trace->max_entries)
+ return;
+
+ trace->entries[trace->nr_entries++] = address;
+}
+
+static const struct stacktrace_ops dump_ops = {
+ .address = save_addr
+};
+
+static void __save_stack_trace(struct task_struct *tsk, struct stack_trace *trace)
+{
+ dump_trace(tsk, &dump_ops, trace);
+ if (trace->nr_entries < trace->max_entries)
+ trace->entries[trace->nr_entries++] = ULONG_MAX;
+}
+
+void save_stack_trace(struct stack_trace *trace)
+{
+ __save_stack_trace(current, trace);
+}
+EXPORT_SYMBOL_GPL(save_stack_trace);
+
+void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
+{
+ __save_stack_trace(tsk, trace);
+}
+EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
diff --git a/arch/um/kernel/syscall.c b/arch/um/kernel/syscall.c
new file mode 100644
index 0000000..c1d0ae0
--- /dev/null
+++ b/arch/um/kernel/syscall.c
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/utsname.h>
+#include <linux/syscalls.h>
+#include <asm/current.h>
+#include <asm/mman.h>
+#include <asm/uaccess.h>
+#include <asm/unistd.h>
+
+long old_mmap(unsigned long addr, unsigned long len,
+ unsigned long prot, unsigned long flags,
+ unsigned long fd, unsigned long offset)
+{
+ long err = -EINVAL;
+ if (offset & ~PAGE_MASK)
+ goto out;
+
+ err = sys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
+ out:
+ return err;
+}
diff --git a/arch/um/kernel/sysrq.c b/arch/um/kernel/sysrq.c
new file mode 100644
index 0000000..aa1b56f
--- /dev/null
+++ b/arch/um/kernel/sysrq.c
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Copyright (C) 2013 Richard Weinberger <richrd@nod.at>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kallsyms.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <asm/sysrq.h>
+#include <asm/stacktrace.h>
+#include <os.h>
+
+static void _print_addr(void *data, unsigned long address, int reliable)
+{
+ pr_info(" [<%08lx>]", address);
+ pr_cont(" %s", reliable ? "" : "? ");
+ print_symbol("%s", address);
+ pr_cont("\n");
+}
+
+static const struct stacktrace_ops stackops = {
+ .address = _print_addr
+};
+
+void show_stack(struct task_struct *task, unsigned long *stack)
+{
+ unsigned long *sp = stack;
+ struct pt_regs *segv_regs = current->thread.segv_regs;
+ int i;
+
+ if (!segv_regs && os_is_signal_stack()) {
+ pr_err("Received SIGSEGV in SIGSEGV handler,"
+ " aborting stack trace!\n");
+ return;
+ }
+
+ if (!stack)
+ sp = get_stack_pointer(task, segv_regs);
+
+ pr_info("Stack:\n");
+ stack = sp;
+ for (i = 0; i < 3 * STACKSLOTS_PER_LINE; i++) {
+ if (kstack_end(stack))
+ break;
+ if (i && ((i % STACKSLOTS_PER_LINE) == 0))
+ pr_cont("\n");
+ pr_cont(" %08lx", *stack++);
+ }
+ pr_cont("\n");
+
+ pr_info("Call Trace:\n");
+ dump_trace(current, &stackops, NULL);
+ pr_info("\n");
+}
diff --git a/arch/um/kernel/time.c b/arch/um/kernel/time.c
new file mode 100644
index 0000000..25c2366
--- /dev/null
+++ b/arch/um/kernel/time.c
@@ -0,0 +1,134 @@
+/*
+ * Copyright (C) 2015 Anton Ivanov (aivanov@{brocade.com,kot-begemot.co.uk})
+ * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
+ * Copyright (C) 2012-2014 Cisco Systems
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/clockchips.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/jiffies.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+#include <linux/threads.h>
+#include <asm/irq.h>
+#include <asm/param.h>
+#include <kern_util.h>
+#include <os.h>
+#include <timer-internal.h>
+
+void timer_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+ do_IRQ(TIMER_IRQ, regs);
+ local_irq_restore(flags);
+}
+
+static int itimer_shutdown(struct clock_event_device *evt)
+{
+ os_timer_disable();
+ return 0;
+}
+
+static int itimer_set_periodic(struct clock_event_device *evt)
+{
+ os_timer_set_interval(NULL, NULL);
+ return 0;
+}
+
+static int itimer_next_event(unsigned long delta,
+ struct clock_event_device *evt)
+{
+ return os_timer_one_shot(delta);
+}
+
+static int itimer_one_shot(struct clock_event_device *evt)
+{
+ os_timer_one_shot(1);
+ return 0;
+}
+
+static struct clock_event_device timer_clockevent = {
+ .name = "posix-timer",
+ .rating = 250,
+ .cpumask = cpu_all_mask,
+ .features = CLOCK_EVT_FEAT_PERIODIC |
+ CLOCK_EVT_FEAT_ONESHOT,
+ .set_state_shutdown = itimer_shutdown,
+ .set_state_periodic = itimer_set_periodic,
+ .set_state_oneshot = itimer_one_shot,
+ .set_next_event = itimer_next_event,
+ .shift = 0,
+ .max_delta_ns = 0xffffffff,
+ .min_delta_ns = TIMER_MIN_DELTA, //microsecond resolution should be enough for anyone, same as 640K RAM
+ .irq = 0,
+ .mult = 1,
+};
+
+static irqreturn_t um_timer(int irq, void *dev)
+{
+ if (get_current()->mm != NULL)
+ {
+ /* userspace - relay signal, results in correct userspace timers */
+ os_alarm_process(get_current()->mm->context.id.u.pid);
+ }
+
+ (*timer_clockevent.event_handler)(&timer_clockevent);
+
+ return IRQ_HANDLED;
+}
+
+static cycle_t timer_read(struct clocksource *cs)
+{
+ return os_nsecs() / TIMER_MULTIPLIER;
+}
+
+static struct clocksource timer_clocksource = {
+ .name = "timer",
+ .rating = 300,
+ .read = timer_read,
+ .mask = CLOCKSOURCE_MASK(64),
+ .flags = CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+static void __init timer_setup(void)
+{
+ int err;
+
+ err = request_irq(TIMER_IRQ, um_timer, IRQF_TIMER, "hr timer", NULL);
+ if (err != 0)
+ printk(KERN_ERR "register_timer : request_irq failed - "
+ "errno = %d\n", -err);
+
+ err = os_timer_create(NULL);
+ if (err != 0) {
+ printk(KERN_ERR "creation of timer failed - errno = %d\n", -err);
+ return;
+ }
+
+ err = clocksource_register_hz(&timer_clocksource, NSEC_PER_SEC/TIMER_MULTIPLIER);
+ if (err) {
+ printk(KERN_ERR "clocksource_register_hz returned %d\n", err);
+ return;
+ }
+ clockevents_register_device(&timer_clockevent);
+}
+
+void read_persistent_clock(struct timespec *ts)
+{
+ long long nsecs = os_persistent_clock_emulation();
+
+ set_normalized_timespec(ts, nsecs / NSEC_PER_SEC,
+ nsecs % NSEC_PER_SEC);
+}
+
+void __init time_init(void)
+{
+ timer_set_signal_handler();
+ late_time_init = timer_setup;
+}
diff --git a/arch/um/kernel/tlb.c b/arch/um/kernel/tlb.c
new file mode 100644
index 0000000..3777b82
--- /dev/null
+++ b/arch/um/kernel/tlb.c
@@ -0,0 +1,558 @@
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <asm/pgtable.h>
+#include <asm/tlbflush.h>
+#include <as-layout.h>
+#include <mem_user.h>
+#include <os.h>
+#include <skas.h>
+#include <kern_util.h>
+
+struct host_vm_change {
+ struct host_vm_op {
+ enum { NONE, MMAP, MUNMAP, MPROTECT } type;
+ union {
+ struct {
+ unsigned long addr;
+ unsigned long len;
+ unsigned int prot;
+ int fd;
+ __u64 offset;
+ } mmap;
+ struct {
+ unsigned long addr;
+ unsigned long len;
+ } munmap;
+ struct {
+ unsigned long addr;
+ unsigned long len;
+ unsigned int prot;
+ } mprotect;
+ } u;
+ } ops[1];
+ int index;
+ struct mm_id *id;
+ void *data;
+ int force;
+};
+
+#define INIT_HVC(mm, force) \
+ ((struct host_vm_change) \
+ { .ops = { { .type = NONE } }, \
+ .id = &mm->context.id, \
+ .data = NULL, \
+ .index = 0, \
+ .force = force })
+
+static void report_enomem(void)
+{
+ printk(KERN_ERR "UML ran out of memory on the host side! "
+ "This can happen due to a memory limitation or "
+ "vm.max_map_count has been reached.\n");
+}
+
+static int do_ops(struct host_vm_change *hvc, int end,
+ int finished)
+{
+ struct host_vm_op *op;
+ int i, ret = 0;
+
+ for (i = 0; i < end && !ret; i++) {
+ op = &hvc->ops[i];
+ switch (op->type) {
+ case MMAP:
+ ret = map(hvc->id, op->u.mmap.addr, op->u.mmap.len,
+ op->u.mmap.prot, op->u.mmap.fd,
+ op->u.mmap.offset, finished, &hvc->data);
+ break;
+ case MUNMAP:
+ ret = unmap(hvc->id, op->u.munmap.addr,
+ op->u.munmap.len, finished, &hvc->data);
+ break;
+ case MPROTECT:
+ ret = protect(hvc->id, op->u.mprotect.addr,
+ op->u.mprotect.len, op->u.mprotect.prot,
+ finished, &hvc->data);
+ break;
+ default:
+ printk(KERN_ERR "Unknown op type %d in do_ops\n",
+ op->type);
+ BUG();
+ break;
+ }
+ }
+
+ if (ret == -ENOMEM)
+ report_enomem();
+
+ return ret;
+}
+
+static int add_mmap(unsigned long virt, unsigned long phys, unsigned long len,
+ unsigned int prot, struct host_vm_change *hvc)
+{
+ __u64 offset;
+ struct host_vm_op *last;
+ int fd, ret = 0;
+
+ fd = phys_mapping(phys, &offset);
+ if (hvc->index != 0) {
+ last = &hvc->ops[hvc->index - 1];
+ if ((last->type == MMAP) &&
+ (last->u.mmap.addr + last->u.mmap.len == virt) &&
+ (last->u.mmap.prot == prot) && (last->u.mmap.fd == fd) &&
+ (last->u.mmap.offset + last->u.mmap.len == offset)) {
+ last->u.mmap.len += len;
+ return 0;
+ }
+ }
+
+ if (hvc->index == ARRAY_SIZE(hvc->ops)) {
+ ret = do_ops(hvc, ARRAY_SIZE(hvc->ops), 0);
+ hvc->index = 0;
+ }
+
+ hvc->ops[hvc->index++] = ((struct host_vm_op)
+ { .type = MMAP,
+ .u = { .mmap = { .addr = virt,
+ .len = len,
+ .prot = prot,
+ .fd = fd,
+ .offset = offset }
+ } });
+ return ret;
+}
+
+static int add_munmap(unsigned long addr, unsigned long len,
+ struct host_vm_change *hvc)
+{
+ struct host_vm_op *last;
+ int ret = 0;
+
+ if ((addr >= STUB_START) && (addr < STUB_END))
+ return -EINVAL;
+
+ if (hvc->index != 0) {
+ last = &hvc->ops[hvc->index - 1];
+ if ((last->type == MUNMAP) &&
+ (last->u.munmap.addr + last->u.mmap.len == addr)) {
+ last->u.munmap.len += len;
+ return 0;
+ }
+ }
+
+ if (hvc->index == ARRAY_SIZE(hvc->ops)) {
+ ret = do_ops(hvc, ARRAY_SIZE(hvc->ops), 0);
+ hvc->index = 0;
+ }
+
+ hvc->ops[hvc->index++] = ((struct host_vm_op)
+ { .type = MUNMAP,
+ .u = { .munmap = { .addr = addr,
+ .len = len } } });
+ return ret;
+}
+
+static int add_mprotect(unsigned long addr, unsigned long len,
+ unsigned int prot, struct host_vm_change *hvc)
+{
+ struct host_vm_op *last;
+ int ret = 0;
+
+ if (hvc->index != 0) {
+ last = &hvc->ops[hvc->index - 1];
+ if ((last->type == MPROTECT) &&
+ (last->u.mprotect.addr + last->u.mprotect.len == addr) &&
+ (last->u.mprotect.prot == prot)) {
+ last->u.mprotect.len += len;
+ return 0;
+ }
+ }
+
+ if (hvc->index == ARRAY_SIZE(hvc->ops)) {
+ ret = do_ops(hvc, ARRAY_SIZE(hvc->ops), 0);
+ hvc->index = 0;
+ }
+
+ hvc->ops[hvc->index++] = ((struct host_vm_op)
+ { .type = MPROTECT,
+ .u = { .mprotect = { .addr = addr,
+ .len = len,
+ .prot = prot } } });
+ return ret;
+}
+
+#define ADD_ROUND(n, inc) (((n) + (inc)) & ~((inc) - 1))
+
+static inline int update_pte_range(pmd_t *pmd, unsigned long addr,
+ unsigned long end,
+ struct host_vm_change *hvc)
+{
+ pte_t *pte;
+ int r, w, x, prot, ret = 0;
+
+ pte = pte_offset_kernel(pmd, addr);
+ do {
+ if ((addr >= STUB_START) && (addr < STUB_END))
+ continue;
+
+ r = pte_read(*pte);
+ w = pte_write(*pte);
+ x = pte_exec(*pte);
+ if (!pte_young(*pte)) {
+ r = 0;
+ w = 0;
+ } else if (!pte_dirty(*pte))
+ w = 0;
+
+ prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
+ (x ? UM_PROT_EXEC : 0));
+ if (hvc->force || pte_newpage(*pte)) {
+ if (pte_present(*pte))
+ ret = add_mmap(addr, pte_val(*pte) & PAGE_MASK,
+ PAGE_SIZE, prot, hvc);
+ else
+ ret = add_munmap(addr, PAGE_SIZE, hvc);
+ } else if (pte_newprot(*pte))
+ ret = add_mprotect(addr, PAGE_SIZE, prot, hvc);
+ *pte = pte_mkuptodate(*pte);
+ } while (pte++, addr += PAGE_SIZE, ((addr < end) && !ret));
+ return ret;
+}
+
+static inline int update_pmd_range(pud_t *pud, unsigned long addr,
+ unsigned long end,
+ struct host_vm_change *hvc)
+{
+ pmd_t *pmd;
+ unsigned long next;
+ int ret = 0;
+
+ pmd = pmd_offset(pud, addr);
+ do {
+ next = pmd_addr_end(addr, end);
+ if (!pmd_present(*pmd)) {
+ if (hvc->force || pmd_newpage(*pmd)) {
+ ret = add_munmap(addr, next - addr, hvc);
+ pmd_mkuptodate(*pmd);
+ }
+ }
+ else ret = update_pte_range(pmd, addr, next, hvc);
+ } while (pmd++, addr = next, ((addr < end) && !ret));
+ return ret;
+}
+
+static inline int update_pud_range(pgd_t *pgd, unsigned long addr,
+ unsigned long end,
+ struct host_vm_change *hvc)
+{
+ pud_t *pud;
+ unsigned long next;
+ int ret = 0;
+
+ pud = pud_offset(pgd, addr);
+ do {
+ next = pud_addr_end(addr, end);
+ if (!pud_present(*pud)) {
+ if (hvc->force || pud_newpage(*pud)) {
+ ret = add_munmap(addr, next - addr, hvc);
+ pud_mkuptodate(*pud);
+ }
+ }
+ else ret = update_pmd_range(pud, addr, next, hvc);
+ } while (pud++, addr = next, ((addr < end) && !ret));
+ return ret;
+}
+
+void fix_range_common(struct mm_struct *mm, unsigned long start_addr,
+ unsigned long end_addr, int force)
+{
+ pgd_t *pgd;
+ struct host_vm_change hvc;
+ unsigned long addr = start_addr, next;
+ int ret = 0;
+
+ hvc = INIT_HVC(mm, force);
+ pgd = pgd_offset(mm, addr);
+ do {
+ next = pgd_addr_end(addr, end_addr);
+ if (!pgd_present(*pgd)) {
+ if (force || pgd_newpage(*pgd)) {
+ ret = add_munmap(addr, next - addr, &hvc);
+ pgd_mkuptodate(*pgd);
+ }
+ }
+ else ret = update_pud_range(pgd, addr, next, &hvc);
+ } while (pgd++, addr = next, ((addr < end_addr) && !ret));
+
+ if (!ret)
+ ret = do_ops(&hvc, hvc.index, 1);
+
+ /* This is not an else because ret is modified above */
+ if (ret) {
+ printk(KERN_ERR "fix_range_common: failed, killing current "
+ "process: %d\n", task_tgid_vnr(current));
+ /* We are under mmap_sem, release it such that current can terminate */
+ up_write(¤t->mm->mmap_sem);
+ force_sig(SIGKILL, current);
+ do_signal(¤t->thread.regs);
+ }
+}
+
+static int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
+{
+ struct mm_struct *mm;
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte;
+ unsigned long addr, last;
+ int updated = 0, err;
+
+ mm = &init_mm;
+ for (addr = start; addr < end;) {
+ pgd = pgd_offset(mm, addr);
+ if (!pgd_present(*pgd)) {
+ last = ADD_ROUND(addr, PGDIR_SIZE);
+ if (last > end)
+ last = end;
+ if (pgd_newpage(*pgd)) {
+ updated = 1;
+ err = os_unmap_memory((void *) addr,
+ last - addr);
+ if (err < 0)
+ panic("munmap failed, errno = %d\n",
+ -err);
+ }
+ addr = last;
+ continue;
+ }
+
+ pud = pud_offset(pgd, addr);
+ if (!pud_present(*pud)) {
+ last = ADD_ROUND(addr, PUD_SIZE);
+ if (last > end)
+ last = end;
+ if (pud_newpage(*pud)) {
+ updated = 1;
+ err = os_unmap_memory((void *) addr,
+ last - addr);
+ if (err < 0)
+ panic("munmap failed, errno = %d\n",
+ -err);
+ }
+ addr = last;
+ continue;
+ }
+
+ pmd = pmd_offset(pud, addr);
+ if (!pmd_present(*pmd)) {
+ last = ADD_ROUND(addr, PMD_SIZE);
+ if (last > end)
+ last = end;
+ if (pmd_newpage(*pmd)) {
+ updated = 1;
+ err = os_unmap_memory((void *) addr,
+ last - addr);
+ if (err < 0)
+ panic("munmap failed, errno = %d\n",
+ -err);
+ }
+ addr = last;
+ continue;
+ }
+
+ pte = pte_offset_kernel(pmd, addr);
+ if (!pte_present(*pte) || pte_newpage(*pte)) {
+ updated = 1;
+ err = os_unmap_memory((void *) addr,
+ PAGE_SIZE);
+ if (err < 0)
+ panic("munmap failed, errno = %d\n",
+ -err);
+ if (pte_present(*pte))
+ map_memory(addr,
+ pte_val(*pte) & PAGE_MASK,
+ PAGE_SIZE, 1, 1, 1);
+ }
+ else if (pte_newprot(*pte)) {
+ updated = 1;
+ os_protect_memory((void *) addr, PAGE_SIZE, 1, 1, 1);
+ }
+ addr += PAGE_SIZE;
+ }
+ return updated;
+}
+
+void flush_tlb_page(struct vm_area_struct *vma, unsigned long address)
+{
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte;
+ struct mm_struct *mm = vma->vm_mm;
+ void *flush = NULL;
+ int r, w, x, prot, err = 0;
+ struct mm_id *mm_id;
+
+ address &= PAGE_MASK;
+ pgd = pgd_offset(mm, address);
+ if (!pgd_present(*pgd))
+ goto kill;
+
+ pud = pud_offset(pgd, address);
+ if (!pud_present(*pud))
+ goto kill;
+
+ pmd = pmd_offset(pud, address);
+ if (!pmd_present(*pmd))
+ goto kill;
+
+ pte = pte_offset_kernel(pmd, address);
+
+ r = pte_read(*pte);
+ w = pte_write(*pte);
+ x = pte_exec(*pte);
+ if (!pte_young(*pte)) {
+ r = 0;
+ w = 0;
+ } else if (!pte_dirty(*pte)) {
+ w = 0;
+ }
+
+ mm_id = &mm->context.id;
+ prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
+ (x ? UM_PROT_EXEC : 0));
+ if (pte_newpage(*pte)) {
+ if (pte_present(*pte)) {
+ unsigned long long offset;
+ int fd;
+
+ fd = phys_mapping(pte_val(*pte) & PAGE_MASK, &offset);
+ err = map(mm_id, address, PAGE_SIZE, prot, fd, offset,
+ 1, &flush);
+ }
+ else err = unmap(mm_id, address, PAGE_SIZE, 1, &flush);
+ }
+ else if (pte_newprot(*pte))
+ err = protect(mm_id, address, PAGE_SIZE, prot, 1, &flush);
+
+ if (err) {
+ if (err == -ENOMEM)
+ report_enomem();
+
+ goto kill;
+ }
+
+ *pte = pte_mkuptodate(*pte);
+
+ return;
+
+kill:
+ printk(KERN_ERR "Failed to flush page for address 0x%lx\n", address);
+ force_sig(SIGKILL, current);
+}
+
+pgd_t *pgd_offset_proc(struct mm_struct *mm, unsigned long address)
+{
+ return pgd_offset(mm, address);
+}
+
+pud_t *pud_offset_proc(pgd_t *pgd, unsigned long address)
+{
+ return pud_offset(pgd, address);
+}
+
+pmd_t *pmd_offset_proc(pud_t *pud, unsigned long address)
+{
+ return pmd_offset(pud, address);
+}
+
+pte_t *pte_offset_proc(pmd_t *pmd, unsigned long address)
+{
+ return pte_offset_kernel(pmd, address);
+}
+
+pte_t *addr_pte(struct task_struct *task, unsigned long addr)
+{
+ pgd_t *pgd = pgd_offset(task->mm, addr);
+ pud_t *pud = pud_offset(pgd, addr);
+ pmd_t *pmd = pmd_offset(pud, addr);
+
+ return pte_offset_map(pmd, addr);
+}
+
+void flush_tlb_all(void)
+{
+ flush_tlb_mm(current->mm);
+}
+
+void flush_tlb_kernel_range(unsigned long start, unsigned long end)
+{
+ flush_tlb_kernel_range_common(start, end);
+}
+
+void flush_tlb_kernel_vm(void)
+{
+ flush_tlb_kernel_range_common(start_vm, end_vm);
+}
+
+void __flush_tlb_one(unsigned long addr)
+{
+ flush_tlb_kernel_range_common(addr, addr + PAGE_SIZE);
+}
+
+static void fix_range(struct mm_struct *mm, unsigned long start_addr,
+ unsigned long end_addr, int force)
+{
+ fix_range_common(mm, start_addr, end_addr, force);
+}
+
+void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
+ unsigned long end)
+{
+ if (vma->vm_mm == NULL)
+ flush_tlb_kernel_range_common(start, end);
+ else fix_range(vma->vm_mm, start, end, 0);
+}
+EXPORT_SYMBOL(flush_tlb_range);
+
+void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
+ unsigned long end)
+{
+ /*
+ * Don't bother flushing if this address space is about to be
+ * destroyed.
+ */
+ if (atomic_read(&mm->mm_users) == 0)
+ return;
+
+ fix_range(mm, start, end, 0);
+}
+
+void flush_tlb_mm(struct mm_struct *mm)
+{
+ struct vm_area_struct *vma = mm->mmap;
+
+ while (vma != NULL) {
+ fix_range(mm, vma->vm_start, vma->vm_end, 0);
+ vma = vma->vm_next;
+ }
+}
+
+void force_flush_all(void)
+{
+ struct mm_struct *mm = current->mm;
+ struct vm_area_struct *vma = mm->mmap;
+
+ while (vma != NULL) {
+ fix_range(mm, vma->vm_start, vma->vm_end, 1);
+ vma = vma->vm_next;
+ }
+}
diff --git a/arch/um/kernel/trap.c b/arch/um/kernel/trap.c
new file mode 100644
index 0000000..98783dd
--- /dev/null
+++ b/arch/um/kernel/trap.c
@@ -0,0 +1,338 @@
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/hardirq.h>
+#include <linux/module.h>
+#include <linux/uaccess.h>
+#include <asm/current.h>
+#include <asm/pgtable.h>
+#include <asm/tlbflush.h>
+#include <arch.h>
+#include <as-layout.h>
+#include <kern_util.h>
+#include <os.h>
+#include <skas.h>
+
+/*
+ * Note this is constrained to return 0, -EFAULT, -EACCESS, -ENOMEM by
+ * segv().
+ */
+int handle_page_fault(unsigned long address, unsigned long ip,
+ int is_write, int is_user, int *code_out)
+{
+ struct mm_struct *mm = current->mm;
+ struct vm_area_struct *vma;
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte;
+ int err = -EFAULT;
+ unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
+
+ *code_out = SEGV_MAPERR;
+
+ /*
+ * If the fault was with pagefaults disabled, don't take the fault, just
+ * fail.
+ */
+ if (faulthandler_disabled())
+ goto out_nosemaphore;
+
+ if (is_user)
+ flags |= FAULT_FLAG_USER;
+retry:
+ down_read(&mm->mmap_sem);
+ vma = find_vma(mm, address);
+ if (!vma)
+ goto out;
+ else if (vma->vm_start <= address)
+ goto good_area;
+ else if (!(vma->vm_flags & VM_GROWSDOWN))
+ goto out;
+ else if (is_user && !ARCH_IS_STACKGROW(address))
+ goto out;
+ else if (expand_stack(vma, address))
+ goto out;
+
+good_area:
+ *code_out = SEGV_ACCERR;
+ if (is_write) {
+ if (!(vma->vm_flags & VM_WRITE))
+ goto out;
+ flags |= FAULT_FLAG_WRITE;
+ } else {
+ /* Don't require VM_READ|VM_EXEC for write faults! */
+ if (!(vma->vm_flags & (VM_READ | VM_EXEC)))
+ goto out;
+ }
+
+ do {
+ int fault;
+
+ fault = handle_mm_fault(mm, vma, address, flags);
+
+ if ((fault & VM_FAULT_RETRY) && fatal_signal_pending(current))
+ goto out_nosemaphore;
+
+ if (unlikely(fault & VM_FAULT_ERROR)) {
+ if (fault & VM_FAULT_OOM) {
+ goto out_of_memory;
+ } else if (fault & VM_FAULT_SIGSEGV) {
+ goto out;
+ } else if (fault & VM_FAULT_SIGBUS) {
+ err = -EACCES;
+ goto out;
+ }
+ BUG();
+ }
+ if (flags & FAULT_FLAG_ALLOW_RETRY) {
+ if (fault & VM_FAULT_MAJOR)
+ current->maj_flt++;
+ else
+ current->min_flt++;
+ if (fault & VM_FAULT_RETRY) {
+ flags &= ~FAULT_FLAG_ALLOW_RETRY;
+ flags |= FAULT_FLAG_TRIED;
+
+ goto retry;
+ }
+ }
+
+ pgd = pgd_offset(mm, address);
+ pud = pud_offset(pgd, address);
+ pmd = pmd_offset(pud, address);
+ pte = pte_offset_kernel(pmd, address);
+ } while (!pte_present(*pte));
+ err = 0;
+ /*
+ * The below warning was added in place of
+ * pte_mkyoung(); if (is_write) pte_mkdirty();
+ * If it's triggered, we'd see normally a hang here (a clean pte is
+ * marked read-only to emulate the dirty bit).
+ * However, the generic code can mark a PTE writable but clean on a
+ * concurrent read fault, triggering this harmlessly. So comment it out.
+ */
+#if 0
+ WARN_ON(!pte_young(*pte) || (is_write && !pte_dirty(*pte)));
+#endif
+ flush_tlb_page(vma, address);
+out:
+ up_read(&mm->mmap_sem);
+out_nosemaphore:
+ return err;
+
+out_of_memory:
+ /*
+ * We ran out of memory, call the OOM killer, and return the userspace
+ * (which will retry the fault, or kill us if we got oom-killed).
+ */
+ up_read(&mm->mmap_sem);
+ if (!is_user)
+ goto out_nosemaphore;
+ pagefault_out_of_memory();
+ return 0;
+}
+EXPORT_SYMBOL(handle_page_fault);
+
+static void show_segv_info(struct uml_pt_regs *regs)
+{
+ struct task_struct *tsk = current;
+ struct faultinfo *fi = UPT_FAULTINFO(regs);
+
+ if (!unhandled_signal(tsk, SIGSEGV))
+ return;
+
+ if (!printk_ratelimit())
+ return;
+
+ printk("%s%s[%d]: segfault at %lx ip %p sp %p error %x",
+ task_pid_nr(tsk) > 1 ? KERN_INFO : KERN_EMERG,
+ tsk->comm, task_pid_nr(tsk), FAULT_ADDRESS(*fi),
+ (void *)UPT_IP(regs), (void *)UPT_SP(regs),
+ fi->error_code);
+
+ print_vma_addr(KERN_CONT " in ", UPT_IP(regs));
+ printk(KERN_CONT "\n");
+}
+
+static void bad_segv(struct faultinfo fi, unsigned long ip)
+{
+ struct siginfo si;
+
+ si.si_signo = SIGSEGV;
+ si.si_code = SEGV_ACCERR;
+ si.si_addr = (void __user *) FAULT_ADDRESS(fi);
+ current->thread.arch.faultinfo = fi;
+ force_sig_info(SIGSEGV, &si, current);
+}
+
+void fatal_sigsegv(void)
+{
+ force_sigsegv(SIGSEGV, current);
+ do_signal(¤t->thread.regs);
+ /*
+ * This is to tell gcc that we're not returning - do_signal
+ * can, in general, return, but in this case, it's not, since
+ * we just got a fatal SIGSEGV queued.
+ */
+ os_dump_core();
+}
+
+void segv_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs)
+{
+ struct faultinfo * fi = UPT_FAULTINFO(regs);
+
+ if (UPT_IS_USER(regs) && !SEGV_IS_FIXABLE(fi)) {
+ show_segv_info(regs);
+ bad_segv(*fi, UPT_IP(regs));
+ return;
+ }
+ segv(*fi, UPT_IP(regs), UPT_IS_USER(regs), regs);
+}
+
+/*
+ * We give a *copy* of the faultinfo in the regs to segv.
+ * This must be done, since nesting SEGVs could overwrite
+ * the info in the regs. A pointer to the info then would
+ * give us bad data!
+ */
+unsigned long segv(struct faultinfo fi, unsigned long ip, int is_user,
+ struct uml_pt_regs *regs)
+{
+ struct siginfo si;
+ jmp_buf *catcher;
+ int err;
+ int is_write = FAULT_WRITE(fi);
+ unsigned long address = FAULT_ADDRESS(fi);
+
+ if (!is_user && regs)
+ current->thread.segv_regs = container_of(regs, struct pt_regs, regs);
+
+ if (!is_user && (address >= start_vm) && (address < end_vm)) {
+ flush_tlb_kernel_vm();
+ goto out;
+ }
+ else if (current->mm == NULL) {
+ show_regs(container_of(regs, struct pt_regs, regs));
+ panic("Segfault with no mm");
+ }
+ else if (!is_user && address > PAGE_SIZE && address < TASK_SIZE) {
+ show_regs(container_of(regs, struct pt_regs, regs));
+ panic("Kernel tried to access user memory at addr 0x%lx, ip 0x%lx",
+ address, ip);
+ }
+
+ if (SEGV_IS_FIXABLE(&fi))
+ err = handle_page_fault(address, ip, is_write, is_user,
+ &si.si_code);
+ else {
+ err = -EFAULT;
+ /*
+ * A thread accessed NULL, we get a fault, but CR2 is invalid.
+ * This code is used in __do_copy_from_user() of TT mode.
+ * XXX tt mode is gone, so maybe this isn't needed any more
+ */
+ address = 0;
+ }
+
+ catcher = current->thread.fault_catcher;
+ if (!err)
+ goto out;
+ else if (catcher != NULL) {
+ current->thread.fault_addr = (void *) address;
+ UML_LONGJMP(catcher, 1);
+ }
+ else if (current->thread.fault_addr != NULL)
+ panic("fault_addr set but no fault catcher");
+ else if (!is_user && arch_fixup(ip, regs))
+ goto out;
+
+ if (!is_user) {
+ show_regs(container_of(regs, struct pt_regs, regs));
+ panic("Kernel mode fault at addr 0x%lx, ip 0x%lx",
+ address, ip);
+ }
+
+ show_segv_info(regs);
+
+ if (err == -EACCES) {
+ si.si_signo = SIGBUS;
+ si.si_errno = 0;
+ si.si_code = BUS_ADRERR;
+ si.si_addr = (void __user *)address;
+ current->thread.arch.faultinfo = fi;
+ force_sig_info(SIGBUS, &si, current);
+ } else {
+ BUG_ON(err != -EFAULT);
+ si.si_signo = SIGSEGV;
+ si.si_addr = (void __user *) address;
+ current->thread.arch.faultinfo = fi;
+ force_sig_info(SIGSEGV, &si, current);
+ }
+
+out:
+ if (regs)
+ current->thread.segv_regs = NULL;
+
+ return 0;
+}
+
+void relay_signal(int sig, struct siginfo *si, struct uml_pt_regs *regs)
+{
+ struct faultinfo *fi;
+ struct siginfo clean_si;
+
+ if (!UPT_IS_USER(regs)) {
+ if (sig == SIGBUS)
+ printk(KERN_ERR "Bus error - the host /dev/shm or /tmp "
+ "mount likely just ran out of space\n");
+ panic("Kernel mode signal %d", sig);
+ }
+
+ arch_examine_signal(sig, regs);
+
+ memset(&clean_si, 0, sizeof(clean_si));
+ clean_si.si_signo = si->si_signo;
+ clean_si.si_errno = si->si_errno;
+ clean_si.si_code = si->si_code;
+ switch (sig) {
+ case SIGILL:
+ case SIGFPE:
+ case SIGSEGV:
+ case SIGBUS:
+ case SIGTRAP:
+ fi = UPT_FAULTINFO(regs);
+ clean_si.si_addr = (void __user *) FAULT_ADDRESS(*fi);
+ current->thread.arch.faultinfo = *fi;
+#ifdef __ARCH_SI_TRAPNO
+ clean_si.si_trapno = si->si_trapno;
+#endif
+ break;
+ default:
+ printk(KERN_ERR "Attempted to relay unknown signal %d (si_code = %d)\n",
+ sig, si->si_code);
+ }
+
+ force_sig_info(sig, &clean_si, current);
+}
+
+void bus_handler(int sig, struct siginfo *si, struct uml_pt_regs *regs)
+{
+ if (current->thread.fault_catcher != NULL)
+ UML_LONGJMP(current->thread.fault_catcher, 1);
+ else
+ relay_signal(sig, si, regs);
+}
+
+void winch(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs)
+{
+ do_IRQ(WINCH_IRQ, regs);
+}
+
+void trap_init(void)
+{
+}
diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c
new file mode 100644
index 0000000..16630e7
--- /dev/null
+++ b/arch/um/kernel/um_arch.c
@@ -0,0 +1,359 @@
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/seq_file.h>
+#include <linux/string.h>
+#include <linux/utsname.h>
+#include <linux/sched.h>
+#include <linux/kmsg_dump.h>
+#include <asm/pgtable.h>
+#include <asm/processor.h>
+#include <asm/sections.h>
+#include <asm/setup.h>
+#include <as-layout.h>
+#include <arch.h>
+#include <init.h>
+#include <kern.h>
+#include <kern_util.h>
+#include <mem_user.h>
+#include <os.h>
+
+#define DEFAULT_COMMAND_LINE "root=98:0"
+
+/* Changed in add_arg and setup_arch, which run before SMP is started */
+static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 };
+
+static void __init add_arg(char *arg)
+{
+ if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) {
+ printf("add_arg: Too many command line arguments!\n");
+ exit(1);
+ }
+ if (strlen(command_line) > 0)
+ strcat(command_line, " ");
+ strcat(command_line, arg);
+}
+
+/*
+ * These fields are initialized at boot time and not changed.
+ * XXX This structure is used only in the non-SMP case. Maybe this
+ * should be moved to smp.c.
+ */
+struct cpuinfo_um boot_cpu_data = {
+ .loops_per_jiffy = 0,
+ .ipi_pipe = { -1, -1 }
+};
+
+union thread_union cpu0_irqstack
+ __attribute__((__section__(".data..init_irqstack"))) =
+ { INIT_THREAD_INFO(init_task) };
+
+unsigned long thread_saved_pc(struct task_struct *task)
+{
+ /* FIXME: Need to look up userspace_pid by cpu */
+ return os_process_pc(userspace_pid[0]);
+}
+
+/* Changed in setup_arch, which is called in early boot */
+static char host_info[(__NEW_UTS_LEN + 1) * 5];
+
+static int show_cpuinfo(struct seq_file *m, void *v)
+{
+ int index = 0;
+
+ seq_printf(m, "processor\t: %d\n", index);
+ seq_printf(m, "vendor_id\t: User Mode Linux\n");
+ seq_printf(m, "model name\t: UML\n");
+ seq_printf(m, "mode\t\t: skas\n");
+ seq_printf(m, "host\t\t: %s\n", host_info);
+ seq_printf(m, "bogomips\t: %lu.%02lu\n\n",
+ loops_per_jiffy/(500000/HZ),
+ (loops_per_jiffy/(5000/HZ)) % 100);
+
+ return 0;
+}
+
+static void *c_start(struct seq_file *m, loff_t *pos)
+{
+ return *pos < NR_CPUS ? cpu_data + *pos : NULL;
+}
+
+static void *c_next(struct seq_file *m, void *v, loff_t *pos)
+{
+ ++*pos;
+ return c_start(m, pos);
+}
+
+static void c_stop(struct seq_file *m, void *v)
+{
+}
+
+const struct seq_operations cpuinfo_op = {
+ .start = c_start,
+ .next = c_next,
+ .stop = c_stop,
+ .show = show_cpuinfo,
+};
+
+/* Set in linux_main */
+unsigned long uml_physmem;
+EXPORT_SYMBOL(uml_physmem);
+
+unsigned long uml_reserved; /* Also modified in mem_init */
+unsigned long start_vm;
+unsigned long end_vm;
+
+/* Set in uml_ncpus_setup */
+int ncpus = 1;
+
+/* Set in early boot */
+static int have_root __initdata = 0;
+
+/* Set in uml_mem_setup and modified in linux_main */
+long long physmem_size = 32 * 1024 * 1024;
+
+static const char *usage_string =
+"User Mode Linux v%s\n"
+" available at http://user-mode-linux.sourceforge.net/\n\n";
+
+static int __init uml_version_setup(char *line, int *add)
+{
+ printf("%s\n", init_utsname()->release);
+ exit(0);
+
+ return 0;
+}
+
+__uml_setup("--version", uml_version_setup,
+"--version\n"
+" Prints the version number of the kernel.\n\n"
+);
+
+static int __init uml_root_setup(char *line, int *add)
+{
+ have_root = 1;
+ return 0;
+}
+
+__uml_setup("root=", uml_root_setup,
+"root=<file containing the root fs>\n"
+" This is actually used by the generic kernel in exactly the same\n"
+" way as in any other kernel. If you configure a number of block\n"
+" devices and want to boot off something other than ubd0, you \n"
+" would use something like:\n"
+" root=/dev/ubd5\n\n"
+);
+
+static int __init no_skas_debug_setup(char *line, int *add)
+{
+ printf("'debug' is not necessary to gdb UML in skas mode - run \n");
+ printf("'gdb linux'\n");
+
+ return 0;
+}
+
+__uml_setup("debug", no_skas_debug_setup,
+"debug\n"
+" this flag is not needed to run gdb on UML in skas mode\n\n"
+);
+
+static int __init Usage(char *line, int *add)
+{
+ const char **p;
+
+ printf(usage_string, init_utsname()->release);
+ p = &__uml_help_start;
+ while (p < &__uml_help_end) {
+ printf("%s", *p);
+ p++;
+ }
+ exit(0);
+ return 0;
+}
+
+__uml_setup("--help", Usage,
+"--help\n"
+" Prints this message.\n\n"
+);
+
+static void __init uml_checksetup(char *line, int *add)
+{
+ struct uml_param *p;
+
+ p = &__uml_setup_start;
+ while (p < &__uml_setup_end) {
+ size_t n;
+
+ n = strlen(p->str);
+ if (!strncmp(line, p->str, n) && p->setup_func(line + n, add))
+ return;
+ p++;
+ }
+}
+
+static void __init uml_postsetup(void)
+{
+ initcall_t *p;
+
+ p = &__uml_postsetup_start;
+ while (p < &__uml_postsetup_end) {
+ (*p)();
+ p++;
+ }
+ return;
+}
+
+static int panic_exit(struct notifier_block *self, unsigned long unused1,
+ void *unused2)
+{
+ kmsg_dump(KMSG_DUMP_PANIC);
+ bust_spinlocks(1);
+ bust_spinlocks(0);
+ uml_exitcode = 1;
+ os_dump_core();
+ return 0;
+}
+
+static struct notifier_block panic_exit_notifier = {
+ .notifier_call = panic_exit,
+ .next = NULL,
+ .priority = 0
+};
+
+void uml_finishsetup(void)
+{
+ atomic_notifier_chain_register(&panic_notifier_list,
+ &panic_exit_notifier);
+
+ uml_postsetup();
+
+ new_thread_handler();
+}
+
+/* Set during early boot */
+unsigned long task_size;
+EXPORT_SYMBOL(task_size);
+
+unsigned long host_task_size;
+
+unsigned long brk_start;
+unsigned long end_iomem;
+EXPORT_SYMBOL(end_iomem);
+
+#define MIN_VMALLOC (32 * 1024 * 1024)
+
+int __init linux_main(int argc, char **argv)
+{
+ unsigned long avail, diff;
+ unsigned long virtmem_size, max_physmem;
+ unsigned long stack;
+ unsigned int i;
+ int add;
+
+ for (i = 1; i < argc; i++) {
+ if ((i == 1) && (argv[i][0] == ' '))
+ continue;
+ add = 1;
+ uml_checksetup(argv[i], &add);
+ if (add)
+ add_arg(argv[i]);
+ }
+ if (have_root == 0)
+ add_arg(DEFAULT_COMMAND_LINE);
+
+ host_task_size = os_get_top_address();
+ /*
+ * TASK_SIZE needs to be PGDIR_SIZE aligned or else exit_mmap craps
+ * out
+ */
+ task_size = host_task_size & PGDIR_MASK;
+
+ /* OS sanity checks that need to happen before the kernel runs */
+ os_early_checks();
+
+ brk_start = (unsigned long) sbrk(0);
+
+ /*
+ * Increase physical memory size for exec-shield users
+ * so they actually get what they asked for. This should
+ * add zero for non-exec shield users
+ */
+
+ diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
+ if (diff > 1024 * 1024) {
+ printf("Adding %ld bytes to physical memory to account for "
+ "exec-shield gap\n", diff);
+ physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
+ }
+
+ uml_physmem = (unsigned long) __binary_start & PAGE_MASK;
+
+ /* Reserve up to 4M after the current brk */
+ uml_reserved = ROUND_4M(brk_start) + (1 << 22);
+
+ setup_machinename(init_utsname()->machine);
+
+ highmem = 0;
+ iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK;
+ max_physmem = TASK_SIZE - uml_physmem - iomem_size - MIN_VMALLOC;
+
+ /*
+ * Zones have to begin on a 1 << MAX_ORDER page boundary,
+ * so this makes sure that's true for highmem
+ */
+ max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1);
+ if (physmem_size + iomem_size > max_physmem) {
+ highmem = physmem_size + iomem_size - max_physmem;
+ physmem_size -= highmem;
+ }
+
+ high_physmem = uml_physmem + physmem_size;
+ end_iomem = high_physmem + iomem_size;
+ high_memory = (void *) end_iomem;
+
+ start_vm = VMALLOC_START;
+
+ setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem);
+ mem_total_pages(physmem_size, iomem_size, highmem);
+
+ virtmem_size = physmem_size;
+ stack = (unsigned long) argv;
+ stack &= ~(1024 * 1024 - 1);
+ avail = stack - start_vm;
+ if (physmem_size > avail)
+ virtmem_size = avail;
+ end_vm = start_vm + virtmem_size;
+
+ if (virtmem_size < physmem_size)
+ printf("Kernel virtual memory size shrunk to %lu bytes\n",
+ virtmem_size);
+
+ stack_protections((unsigned long) &init_thread_info);
+ os_flush_stdout();
+
+ return start_uml();
+}
+
+void __init setup_arch(char **cmdline_p)
+{
+ paging_init();
+ strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
+ *cmdline_p = command_line;
+ setup_hostinfo(host_info, sizeof host_info);
+}
+
+void __init check_bugs(void)
+{
+ arch_check_bugs();
+ os_check_bugs();
+}
+
+void apply_alternatives(struct alt_instr *start, struct alt_instr *end)
+{
+}
diff --git a/arch/um/kernel/umid.c b/arch/um/kernel/umid.c
new file mode 100644
index 0000000..f6cc3bd
--- /dev/null
+++ b/arch/um/kernel/umid.c
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <asm/errno.h>
+#include <init.h>
+#include <kern.h>
+#include <os.h>
+
+/* Changed by set_umid_arg */
+static int umid_inited = 0;
+
+static int __init set_umid_arg(char *name, int *add)
+{
+ int err;
+
+ if (umid_inited) {
+ printf("umid already set\n");
+ return 0;
+ }
+
+ *add = 0;
+ err = set_umid(name);
+ if (err == -EEXIST)
+ printf("umid '%s' already in use\n", name);
+ else if (!err)
+ umid_inited = 1;
+
+ return 0;
+}
+
+__uml_setup("umid=", set_umid_arg,
+"umid=<name>\n"
+" This is used to assign a unique identity to this UML machine and\n"
+" is used for naming the pid file and management console socket.\n\n"
+);
+
diff --git a/arch/um/kernel/uml.lds.S b/arch/um/kernel/uml.lds.S
new file mode 100644
index 0000000..6899195
--- /dev/null
+++ b/arch/um/kernel/uml.lds.S
@@ -0,0 +1,111 @@
+#include <asm-generic/vmlinux.lds.h>
+#include <asm/page.h>
+
+OUTPUT_FORMAT(ELF_FORMAT)
+OUTPUT_ARCH(ELF_ARCH)
+ENTRY(_start)
+jiffies = jiffies_64;
+
+SECTIONS
+{
+ /* This must contain the right address - not quite the default ELF one.*/
+ PROVIDE (__executable_start = START);
+ /* Static binaries stick stuff here, like the sigreturn trampoline,
+ * invisibly to objdump. So, just make __binary_start equal to the very
+ * beginning of the executable, and if there are unmapped pages after this,
+ * they are forever unusable.
+ */
+ __binary_start = START;
+
+ . = START + SIZEOF_HEADERS;
+
+ _text = .;
+ INIT_TEXT_SECTION(0)
+ . = ALIGN(PAGE_SIZE);
+
+ .text :
+ {
+ _stext = .;
+ TEXT_TEXT
+ SCHED_TEXT
+ LOCK_TEXT
+ *(.fixup)
+ /* .gnu.warning sections are handled specially by elf32.em. */
+ *(.gnu.warning)
+ *(.gnu.linkonce.t*)
+ }
+
+ . = ALIGN(PAGE_SIZE);
+ .syscall_stub : {
+ __syscall_stub_start = .;
+ *(.__syscall_stub*)
+ __syscall_stub_end = .;
+ }
+
+ /*
+ * These are needed even in a static link, even if they wind up being empty.
+ * Newer glibc needs these __rel{,a}_iplt_{start,end} symbols.
+ */
+ .rel.plt : {
+ *(.rel.plt)
+ PROVIDE_HIDDEN(__rel_iplt_start = .);
+ *(.rel.iplt)
+ PROVIDE_HIDDEN(__rel_iplt_end = .);
+ }
+ .rela.plt : {
+ *(.rela.plt)
+ PROVIDE_HIDDEN(__rela_iplt_start = .);
+ *(.rela.iplt)
+ PROVIDE_HIDDEN(__rela_iplt_end = .);
+ }
+
+ #include <asm/common.lds.S>
+
+ __init_begin = .;
+ init.data : { INIT_DATA }
+ __init_end = .;
+
+ .data :
+ {
+ INIT_TASK_DATA(KERNEL_STACK_SIZE)
+ . = ALIGN(KERNEL_STACK_SIZE);
+ *(.data..init_irqstack)
+ DATA_DATA
+ *(.gnu.linkonce.d*)
+ CONSTRUCTORS
+ }
+ .data1 : { *(.data1) }
+ .ctors :
+ {
+ *(.ctors)
+ }
+ .dtors :
+ {
+ *(.dtors)
+ }
+
+ .got : { *(.got.plt) *(.got) }
+ .dynamic : { *(.dynamic) }
+ .tdata : { *(.tdata .tdata.* .gnu.linkonce.td.*) }
+ .tbss : { *(.tbss .tbss.* .gnu.linkonce.tb.*) *(.tcommon) }
+ /* We want the small data sections together, so single-instruction offsets
+ can access them all, and initialized data all before uninitialized, so
+ we can shorten the on-disk segment size. */
+ .sdata : { *(.sdata) }
+ _edata = .;
+ PROVIDE (edata = .);
+ . = ALIGN(PAGE_SIZE);
+ __bss_start = .;
+ PROVIDE(_bss_start = .);
+ SBSS(0)
+ BSS(0)
+ __bss_stop = .;
+ _end = .;
+ PROVIDE (end = .);
+
+ STABS_DEBUG
+
+ DWARF_DEBUG
+
+ DISCARDS
+}
diff --git a/arch/um/kernel/vmlinux.lds.S b/arch/um/kernel/vmlinux.lds.S
new file mode 100644
index 0000000..16e49bf
--- /dev/null
+++ b/arch/um/kernel/vmlinux.lds.S
@@ -0,0 +1,8 @@
+
+KERNEL_STACK_SIZE = 4096 * (1 << CONFIG_KERNEL_STACK_ORDER);
+
+#ifdef CONFIG_LD_SCRIPT_STATIC
+#include "uml.lds.S"
+#else
+#include "dyn.lds.S"
+#endif
diff --git a/arch/um/os-Linux/Makefile b/arch/um/os-Linux/Makefile
new file mode 100644
index 0000000..08ff509
--- /dev/null
+++ b/arch/um/os-Linux/Makefile
@@ -0,0 +1,20 @@
+#
+# Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+# Licensed under the GPL
+#
+
+obj-y = aio.o execvp.o file.o helper.o irq.o main.o mem.o process.o \
+ registers.o sigio.o signal.o start_up.o time.o tty.o \
+ umid.o user_syms.o util.o drivers/ skas/
+
+obj-$(CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA) += elf_aux.o
+
+USER_OBJS := $(user-objs-y) aio.o elf_aux.o execvp.o file.o helper.o irq.o \
+ main.o mem.o process.o registers.o sigio.o signal.o start_up.o time.o \
+ tty.o umid.o util.o
+
+HAVE_AIO_ABI := $(shell [ -r /usr/include/linux/aio_abi.h ] && \
+ echo -DHAVE_AIO_ABI )
+CFLAGS_aio.o += $(HAVE_AIO_ABI)
+
+include arch/um/scripts/Makefile.rules
diff --git a/arch/um/os-Linux/aio.c b/arch/um/os-Linux/aio.c
new file mode 100644
index 0000000..014eb35
--- /dev/null
+++ b/arch/um/os-Linux/aio.c
@@ -0,0 +1,390 @@
+/*
+ * Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <unistd.h>
+#include <sched.h>
+#include <signal.h>
+#include <errno.h>
+#include <sys/time.h>
+#include <asm/unistd.h>
+#include <aio.h>
+#include <init.h>
+#include <kern_util.h>
+#include <os.h>
+
+struct aio_thread_req {
+ enum aio_type type;
+ int io_fd;
+ unsigned long long offset;
+ char *buf;
+ int len;
+ struct aio_context *aio;
+};
+
+#if defined(HAVE_AIO_ABI)
+#include <linux/aio_abi.h>
+
+/*
+ * If we have the headers, we are going to build with AIO enabled.
+ * If we don't have aio in libc, we define the necessary stubs here.
+ */
+
+#if !defined(HAVE_AIO_LIBC)
+
+static long io_setup(int n, aio_context_t *ctxp)
+{
+ return syscall(__NR_io_setup, n, ctxp);
+}
+
+static long io_submit(aio_context_t ctx, long nr, struct iocb **iocbpp)
+{
+ return syscall(__NR_io_submit, ctx, nr, iocbpp);
+}
+
+static long io_getevents(aio_context_t ctx_id, long min_nr, long nr,
+ struct io_event *events, struct timespec *timeout)
+{
+ return syscall(__NR_io_getevents, ctx_id, min_nr, nr, events, timeout);
+}
+
+#endif
+
+/*
+ * The AIO_MMAP cases force the mmapped page into memory here
+ * rather than in whatever place first touches the data. I used
+ * to do this by touching the page, but that's delicate because
+ * gcc is prone to optimizing that away. So, what's done here
+ * is we read from the descriptor from which the page was
+ * mapped. The caller is required to pass an offset which is
+ * inside the page that was mapped. Thus, when the read
+ * returns, we know that the page is in the page cache, and
+ * that it now backs the mmapped area.
+ */
+
+static int do_aio(aio_context_t ctx, enum aio_type type, int fd, char *buf,
+ int len, unsigned long long offset, struct aio_context *aio)
+{
+ struct iocb *iocbp = & ((struct iocb) {
+ .aio_data = (unsigned long) aio,
+ .aio_fildes = fd,
+ .aio_buf = (unsigned long) buf,
+ .aio_nbytes = len,
+ .aio_offset = offset
+ });
+ char c;
+
+ switch (type) {
+ case AIO_READ:
+ iocbp->aio_lio_opcode = IOCB_CMD_PREAD;
+ break;
+ case AIO_WRITE:
+ iocbp->aio_lio_opcode = IOCB_CMD_PWRITE;
+ break;
+ case AIO_MMAP:
+ iocbp->aio_lio_opcode = IOCB_CMD_PREAD;
+ iocbp->aio_buf = (unsigned long) &c;
+ iocbp->aio_nbytes = sizeof(c);
+ break;
+ default:
+ printk(UM_KERN_ERR "Bogus op in do_aio - %d\n", type);
+ return -EINVAL;
+ }
+
+ return (io_submit(ctx, 1, &iocbp) > 0) ? 0 : -errno;
+}
+
+/* Initialized in an initcall and unchanged thereafter */
+static aio_context_t ctx = 0;
+
+static int aio_thread(void *arg)
+{
+ struct aio_thread_reply reply;
+ struct io_event event;
+ int err, n, reply_fd;
+
+ os_fix_helper_signals();
+ while (1) {
+ n = io_getevents(ctx, 1, 1, &event, NULL);
+ if (n < 0) {
+ if (errno == EINTR)
+ continue;
+ printk(UM_KERN_ERR "aio_thread - io_getevents failed, "
+ "errno = %d\n", errno);
+ }
+ else {
+ reply = ((struct aio_thread_reply)
+ { .data = (void *) (long) event.data,
+ .err = event.res });
+ reply_fd = ((struct aio_context *) reply.data)->reply_fd;
+ err = write(reply_fd, &reply, sizeof(reply));
+ if (err != sizeof(reply))
+ printk(UM_KERN_ERR "aio_thread - write failed, "
+ "fd = %d, err = %d\n", reply_fd, errno);
+ }
+ }
+ return 0;
+}
+
+#endif
+
+static int do_not_aio(struct aio_thread_req *req)
+{
+ char c;
+ unsigned long long actual;
+ int n;
+
+ actual = lseek64(req->io_fd, req->offset, SEEK_SET);
+ if (actual != req->offset)
+ return -errno;
+
+ switch (req->type) {
+ case AIO_READ:
+ n = read(req->io_fd, req->buf, req->len);
+ break;
+ case AIO_WRITE:
+ n = write(req->io_fd, req->buf, req->len);
+ break;
+ case AIO_MMAP:
+ n = read(req->io_fd, &c, sizeof(c));
+ break;
+ default:
+ printk(UM_KERN_ERR "do_not_aio - bad request type : %d\n",
+ req->type);
+ return -EINVAL;
+ }
+
+ if (n < 0)
+ return -errno;
+ return 0;
+}
+
+/* These are initialized in initcalls and not changed */
+static int aio_req_fd_r = -1;
+static int aio_req_fd_w = -1;
+static int aio_pid = -1;
+static unsigned long aio_stack;
+
+static int not_aio_thread(void *arg)
+{
+ struct aio_thread_req req;
+ struct aio_thread_reply reply;
+ int err;
+
+ os_fix_helper_signals();
+ while (1) {
+ err = read(aio_req_fd_r, &req, sizeof(req));
+ if (err != sizeof(req)) {
+ if (err < 0)
+ printk(UM_KERN_ERR "not_aio_thread - "
+ "read failed, fd = %d, err = %d\n",
+ aio_req_fd_r,
+ errno);
+ else {
+ printk(UM_KERN_ERR "not_aio_thread - short "
+ "read, fd = %d, length = %d\n",
+ aio_req_fd_r, err);
+ }
+ continue;
+ }
+ err = do_not_aio(&req);
+ reply = ((struct aio_thread_reply) { .data = req.aio,
+ .err = err });
+ err = write(req.aio->reply_fd, &reply, sizeof(reply));
+ if (err != sizeof(reply))
+ printk(UM_KERN_ERR "not_aio_thread - write failed, "
+ "fd = %d, err = %d\n", req.aio->reply_fd, errno);
+ }
+
+ return 0;
+}
+
+static int init_aio_24(void)
+{
+ int fds[2], err;
+
+ err = os_pipe(fds, 1, 1);
+ if (err)
+ goto out;
+
+ aio_req_fd_w = fds[0];
+ aio_req_fd_r = fds[1];
+
+ err = os_set_fd_block(aio_req_fd_w, 0);
+ if (err)
+ goto out_close_pipe;
+
+ err = run_helper_thread(not_aio_thread, NULL,
+ CLONE_FILES | CLONE_VM, &aio_stack);
+ if (err < 0)
+ goto out_close_pipe;
+
+ aio_pid = err;
+ goto out;
+
+out_close_pipe:
+ close(fds[0]);
+ close(fds[1]);
+ aio_req_fd_w = -1;
+ aio_req_fd_r = -1;
+out:
+#ifndef HAVE_AIO_ABI
+ printk(UM_KERN_INFO "/usr/include/linux/aio_abi.h not present during "
+ "build\n");
+#endif
+ printk(UM_KERN_INFO "2.6 host AIO support not used - falling back to "
+ "I/O thread\n");
+ return 0;
+}
+
+#ifdef HAVE_AIO_ABI
+#define DEFAULT_24_AIO 0
+static int init_aio_26(void)
+{
+ int err;
+
+ if (io_setup(256, &ctx)) {
+ err = -errno;
+ printk(UM_KERN_ERR "aio_thread failed to initialize context, "
+ "err = %d\n", errno);
+ return err;
+ }
+
+ err = run_helper_thread(aio_thread, NULL,
+ CLONE_FILES | CLONE_VM, &aio_stack);
+ if (err < 0)
+ return err;
+
+ aio_pid = err;
+
+ printk(UM_KERN_INFO "Using 2.6 host AIO\n");
+ return 0;
+}
+
+static int submit_aio_26(enum aio_type type, int io_fd, char *buf, int len,
+ unsigned long long offset, struct aio_context *aio)
+{
+ struct aio_thread_reply reply;
+ int err;
+
+ err = do_aio(ctx, type, io_fd, buf, len, offset, aio);
+ if (err) {
+ reply = ((struct aio_thread_reply) { .data = aio,
+ .err = err });
+ err = write(aio->reply_fd, &reply, sizeof(reply));
+ if (err != sizeof(reply)) {
+ err = -errno;
+ printk(UM_KERN_ERR "submit_aio_26 - write failed, "
+ "fd = %d, err = %d\n", aio->reply_fd, -err);
+ }
+ else err = 0;
+ }
+
+ return err;
+}
+
+#else
+#define DEFAULT_24_AIO 1
+static int init_aio_26(void)
+{
+ return -ENOSYS;
+}
+
+static int submit_aio_26(enum aio_type type, int io_fd, char *buf, int len,
+ unsigned long long offset, struct aio_context *aio)
+{
+ return -ENOSYS;
+}
+#endif
+
+/* Initialized in an initcall and unchanged thereafter */
+static int aio_24 = DEFAULT_24_AIO;
+
+static int __init set_aio_24(char *name, int *add)
+{
+ aio_24 = 1;
+ return 0;
+}
+
+__uml_setup("aio=2.4", set_aio_24,
+"aio=2.4\n"
+" This is used to force UML to use 2.4-style AIO even when 2.6 AIO is\n"
+" available. 2.4 AIO is a single thread that handles one request at a\n"
+" time, synchronously. 2.6 AIO is a thread which uses the 2.6 AIO \n"
+" interface to handle an arbitrary number of pending requests. 2.6 AIO \n"
+" is not available in tt mode, on 2.4 hosts, or when UML is built with\n"
+" /usr/include/linux/aio_abi.h not available. Many distributions don't\n"
+" include aio_abi.h, so you will need to copy it from a kernel tree to\n"
+" your /usr/include/linux in order to build an AIO-capable UML\n\n"
+);
+
+static int init_aio(void)
+{
+ int err;
+
+ if (!aio_24) {
+ err = init_aio_26();
+ if (err && (errno == ENOSYS)) {
+ printk(UM_KERN_INFO "2.6 AIO not supported on the "
+ "host - reverting to 2.4 AIO\n");
+ aio_24 = 1;
+ }
+ else return err;
+ }
+
+ if (aio_24)
+ return init_aio_24();
+
+ return 0;
+}
+
+/*
+ * The reason for the __initcall/__uml_exitcall asymmetry is that init_aio
+ * needs to be called when the kernel is running because it calls run_helper,
+ * which needs get_free_page. exit_aio is a __uml_exitcall because the generic
+ * kernel does not run __exitcalls on shutdown, and can't because many of them
+ * break when called outside of module unloading.
+ */
+__initcall(init_aio);
+
+static void exit_aio(void)
+{
+ if (aio_pid != -1) {
+ os_kill_process(aio_pid, 1);
+ free_stack(aio_stack, 0);
+ }
+}
+
+__uml_exitcall(exit_aio);
+
+static int submit_aio_24(enum aio_type type, int io_fd, char *buf, int len,
+ unsigned long long offset, struct aio_context *aio)
+{
+ struct aio_thread_req req = { .type = type,
+ .io_fd = io_fd,
+ .offset = offset,
+ .buf = buf,
+ .len = len,
+ .aio = aio,
+ };
+ int err;
+
+ err = write(aio_req_fd_w, &req, sizeof(req));
+ if (err == sizeof(req))
+ err = 0;
+ else err = -errno;
+
+ return err;
+}
+
+int submit_aio(enum aio_type type, int io_fd, char *buf, int len,
+ unsigned long long offset, int reply_fd,
+ struct aio_context *aio)
+{
+ aio->reply_fd = reply_fd;
+ if (aio_24)
+ return submit_aio_24(type, io_fd, buf, len, offset, aio);
+ else
+ return submit_aio_26(type, io_fd, buf, len, offset, aio);
+}
diff --git a/arch/um/os-Linux/drivers/Makefile b/arch/um/os-Linux/drivers/Makefile
new file mode 100644
index 0000000..6c546dc
--- /dev/null
+++ b/arch/um/os-Linux/drivers/Makefile
@@ -0,0 +1,13 @@
+#
+# Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com)
+# Licensed under the GPL
+#
+
+ethertap-objs := ethertap_kern.o ethertap_user.o
+tuntap-objs := tuntap_kern.o tuntap_user.o
+
+obj-y =
+obj-$(CONFIG_UML_NET_ETHERTAP) += ethertap.o
+obj-$(CONFIG_UML_NET_TUNTAP) += tuntap.o
+
+include arch/um/scripts/Makefile.rules
diff --git a/arch/um/os-Linux/drivers/etap.h b/arch/um/os-Linux/drivers/etap.h
new file mode 100644
index 0000000..54183a6
--- /dev/null
+++ b/arch/um/os-Linux/drivers/etap.h
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __DRIVERS_ETAP_H
+#define __DRIVERS_ETAP_H
+
+#include <net_user.h>
+
+struct ethertap_data {
+ char *dev_name;
+ char *gate_addr;
+ int data_fd;
+ int control_fd;
+ void *dev;
+};
+
+extern const struct net_user_info ethertap_user_info;
+
+#endif
diff --git a/arch/um/os-Linux/drivers/ethertap_kern.c b/arch/um/os-Linux/drivers/ethertap_kern.c
new file mode 100644
index 0000000..f424600
--- /dev/null
+++ b/arch/um/os-Linux/drivers/ethertap_kern.c
@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
+ * James Leu (jleu@mindspring.net).
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Copyright (C) 2001 by various other people who didn't put their name here.
+ * Licensed under the GPL.
+ */
+
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include "etap.h"
+#include <net_kern.h>
+
+struct ethertap_init {
+ char *dev_name;
+ char *gate_addr;
+};
+
+static void etap_init(struct net_device *dev, void *data)
+{
+ struct uml_net_private *pri;
+ struct ethertap_data *epri;
+ struct ethertap_init *init = data;
+
+ pri = netdev_priv(dev);
+ epri = (struct ethertap_data *) pri->user;
+ epri->dev_name = init->dev_name;
+ epri->gate_addr = init->gate_addr;
+ epri->data_fd = -1;
+ epri->control_fd = -1;
+ epri->dev = dev;
+
+ printk(KERN_INFO "ethertap backend - %s", epri->dev_name);
+ if (epri->gate_addr != NULL)
+ printk(KERN_CONT ", IP = %s", epri->gate_addr);
+ printk(KERN_CONT "\n");
+}
+
+static int etap_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ int len;
+
+ len = net_recvfrom(fd, skb_mac_header(skb),
+ skb->dev->mtu + 2 + ETH_HEADER_ETHERTAP);
+ if (len <= 0)
+ return(len);
+
+ skb_pull(skb, 2);
+ len -= 2;
+ return len;
+}
+
+static int etap_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ skb_push(skb, 2);
+ return net_send(fd, skb->data, skb->len);
+}
+
+const struct net_kern_info ethertap_kern_info = {
+ .init = etap_init,
+ .protocol = eth_protocol,
+ .read = etap_read,
+ .write = etap_write,
+};
+
+int ethertap_setup(char *str, char **mac_out, void *data)
+{
+ struct ethertap_init *init = data;
+
+ *init = ((struct ethertap_init)
+ { .dev_name = NULL,
+ .gate_addr = NULL });
+ if (tap_setup_common(str, "ethertap", &init->dev_name, mac_out,
+ &init->gate_addr))
+ return 0;
+ if (init->dev_name == NULL) {
+ printk(KERN_ERR "ethertap_setup : Missing tap device name\n");
+ return 0;
+ }
+
+ return 1;
+}
+
+static struct transport ethertap_transport = {
+ .list = LIST_HEAD_INIT(ethertap_transport.list),
+ .name = "ethertap",
+ .setup = ethertap_setup,
+ .user = ðertap_user_info,
+ .kern = ðertap_kern_info,
+ .private_size = sizeof(struct ethertap_data),
+ .setup_size = sizeof(struct ethertap_init),
+};
+
+static int register_ethertap(void)
+{
+ register_transport(ðertap_transport);
+ return 0;
+}
+
+late_initcall(register_ethertap);
diff --git a/arch/um/os-Linux/drivers/ethertap_user.c b/arch/um/os-Linux/drivers/ethertap_user.c
new file mode 100644
index 0000000..6d49182
--- /dev/null
+++ b/arch/um/os-Linux/drivers/ethertap_user.c
@@ -0,0 +1,248 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
+ * James Leu (jleu@mindspring.net).
+ * Copyright (C) 2001 by various other people who didn't put their name here.
+ * Licensed under the GPL.
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include "etap.h"
+#include <os.h>
+#include <net_user.h>
+#include <um_malloc.h>
+
+#define MAX_PACKET ETH_MAX_PACKET
+
+static int etap_user_init(void *data, void *dev)
+{
+ struct ethertap_data *pri = data;
+
+ pri->dev = dev;
+ return 0;
+}
+
+struct addr_change {
+ enum { ADD_ADDR, DEL_ADDR } what;
+ unsigned char addr[4];
+ unsigned char netmask[4];
+};
+
+static void etap_change(int op, unsigned char *addr, unsigned char *netmask,
+ int fd)
+{
+ struct addr_change change;
+ char *output;
+ int n;
+
+ change.what = op;
+ memcpy(change.addr, addr, sizeof(change.addr));
+ memcpy(change.netmask, netmask, sizeof(change.netmask));
+ CATCH_EINTR(n = write(fd, &change, sizeof(change)));
+ if (n != sizeof(change)) {
+ printk(UM_KERN_ERR "etap_change - request failed, err = %d\n",
+ errno);
+ return;
+ }
+
+ output = uml_kmalloc(UM_KERN_PAGE_SIZE, UM_GFP_KERNEL);
+ if (output == NULL)
+ printk(UM_KERN_ERR "etap_change : Failed to allocate output "
+ "buffer\n");
+ read_output(fd, output, UM_KERN_PAGE_SIZE);
+ if (output != NULL) {
+ printk("%s", output);
+ kfree(output);
+ }
+}
+
+static void etap_open_addr(unsigned char *addr, unsigned char *netmask,
+ void *arg)
+{
+ etap_change(ADD_ADDR, addr, netmask, *((int *) arg));
+}
+
+static void etap_close_addr(unsigned char *addr, unsigned char *netmask,
+ void *arg)
+{
+ etap_change(DEL_ADDR, addr, netmask, *((int *) arg));
+}
+
+struct etap_pre_exec_data {
+ int control_remote;
+ int control_me;
+ int data_me;
+};
+
+static void etap_pre_exec(void *arg)
+{
+ struct etap_pre_exec_data *data = arg;
+
+ dup2(data->control_remote, 1);
+ close(data->data_me);
+ close(data->control_me);
+}
+
+static int etap_tramp(char *dev, char *gate, int control_me,
+ int control_remote, int data_me, int data_remote)
+{
+ struct etap_pre_exec_data pe_data;
+ int pid, err, n;
+ char version_buf[sizeof("nnnnn\0")];
+ char data_fd_buf[sizeof("nnnnnn\0")];
+ char gate_buf[sizeof("nnn.nnn.nnn.nnn\0")];
+ char *setup_args[] = { "uml_net", version_buf, "ethertap", dev,
+ data_fd_buf, gate_buf, NULL };
+ char *nosetup_args[] = { "uml_net", version_buf, "ethertap",
+ dev, data_fd_buf, NULL };
+ char **args, c;
+
+ sprintf(data_fd_buf, "%d", data_remote);
+ sprintf(version_buf, "%d", UML_NET_VERSION);
+ if (gate != NULL) {
+ strncpy(gate_buf, gate, 15);
+ args = setup_args;
+ }
+ else args = nosetup_args;
+
+ err = 0;
+ pe_data.control_remote = control_remote;
+ pe_data.control_me = control_me;
+ pe_data.data_me = data_me;
+ pid = run_helper(etap_pre_exec, &pe_data, args);
+
+ if (pid < 0)
+ err = pid;
+ close(data_remote);
+ close(control_remote);
+ CATCH_EINTR(n = read(control_me, &c, sizeof(c)));
+ if (n != sizeof(c)) {
+ err = -errno;
+ printk(UM_KERN_ERR "etap_tramp : read of status failed, "
+ "err = %d\n", -err);
+ return err;
+ }
+ if (c != 1) {
+ printk(UM_KERN_ERR "etap_tramp : uml_net failed\n");
+ err = helper_wait(pid);
+ }
+ return err;
+}
+
+static int etap_open(void *data)
+{
+ struct ethertap_data *pri = data;
+ char *output;
+ int data_fds[2], control_fds[2], err, output_len;
+
+ err = tap_open_common(pri->dev, pri->gate_addr);
+ if (err)
+ return err;
+
+ err = socketpair(AF_UNIX, SOCK_DGRAM, 0, data_fds);
+ if (err) {
+ err = -errno;
+ printk(UM_KERN_ERR "etap_open - data socketpair failed - "
+ "err = %d\n", errno);
+ return err;
+ }
+
+ err = socketpair(AF_UNIX, SOCK_STREAM, 0, control_fds);
+ if (err) {
+ err = -errno;
+ printk(UM_KERN_ERR "etap_open - control socketpair failed - "
+ "err = %d\n", errno);
+ goto out_close_data;
+ }
+
+ err = etap_tramp(pri->dev_name, pri->gate_addr, control_fds[0],
+ control_fds[1], data_fds[0], data_fds[1]);
+ output_len = UM_KERN_PAGE_SIZE;
+ output = uml_kmalloc(output_len, UM_GFP_KERNEL);
+ read_output(control_fds[0], output, output_len);
+
+ if (output == NULL)
+ printk(UM_KERN_ERR "etap_open : failed to allocate output "
+ "buffer\n");
+ else {
+ printk("%s", output);
+ kfree(output);
+ }
+
+ if (err < 0) {
+ printk(UM_KERN_ERR "etap_tramp failed - err = %d\n", -err);
+ goto out_close_control;
+ }
+
+ pri->data_fd = data_fds[0];
+ pri->control_fd = control_fds[0];
+ iter_addresses(pri->dev, etap_open_addr, &pri->control_fd);
+ return data_fds[0];
+
+out_close_control:
+ close(control_fds[0]);
+ close(control_fds[1]);
+out_close_data:
+ close(data_fds[0]);
+ close(data_fds[1]);
+ return err;
+}
+
+static void etap_close(int fd, void *data)
+{
+ struct ethertap_data *pri = data;
+
+ iter_addresses(pri->dev, etap_close_addr, &pri->control_fd);
+ close(fd);
+
+ if (shutdown(pri->data_fd, SHUT_RDWR) < 0)
+ printk(UM_KERN_ERR "etap_close - shutdown data socket failed, "
+ "errno = %d\n", errno);
+
+ if (shutdown(pri->control_fd, SHUT_RDWR) < 0)
+ printk(UM_KERN_ERR "etap_close - shutdown control socket "
+ "failed, errno = %d\n", errno);
+
+ close(pri->data_fd);
+ pri->data_fd = -1;
+ close(pri->control_fd);
+ pri->control_fd = -1;
+}
+
+static void etap_add_addr(unsigned char *addr, unsigned char *netmask,
+ void *data)
+{
+ struct ethertap_data *pri = data;
+
+ tap_check_ips(pri->gate_addr, addr);
+ if (pri->control_fd == -1)
+ return;
+ etap_open_addr(addr, netmask, &pri->control_fd);
+}
+
+static void etap_del_addr(unsigned char *addr, unsigned char *netmask,
+ void *data)
+{
+ struct ethertap_data *pri = data;
+
+ if (pri->control_fd == -1)
+ return;
+
+ etap_close_addr(addr, netmask, &pri->control_fd);
+}
+
+const struct net_user_info ethertap_user_info = {
+ .init = etap_user_init,
+ .open = etap_open,
+ .close = etap_close,
+ .remove = NULL,
+ .add_address = etap_add_addr,
+ .delete_address = etap_del_addr,
+ .mtu = ETH_MAX_PACKET,
+ .max_packet = ETH_MAX_PACKET + ETH_HEADER_ETHERTAP,
+};
diff --git a/arch/um/os-Linux/drivers/tuntap.h b/arch/um/os-Linux/drivers/tuntap.h
new file mode 100644
index 0000000..7367354
--- /dev/null
+++ b/arch/um/os-Linux/drivers/tuntap.h
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_TUNTAP_H
+#define __UM_TUNTAP_H
+
+#include <net_user.h>
+
+struct tuntap_data {
+ char *dev_name;
+ int fixed_config;
+ char *gate_addr;
+ int fd;
+ void *dev;
+};
+
+extern const struct net_user_info tuntap_user_info;
+
+#endif
diff --git a/arch/um/os-Linux/drivers/tuntap_kern.c b/arch/um/os-Linux/drivers/tuntap_kern.c
new file mode 100644
index 0000000..d9d56e5
--- /dev/null
+++ b/arch/um/os-Linux/drivers/tuntap_kern.c
@@ -0,0 +1,86 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/netdevice.h>
+#include <linux/init.h>
+#include <linux/skbuff.h>
+#include <asm/errno.h>
+#include <net_kern.h>
+#include "tuntap.h"
+
+struct tuntap_init {
+ char *dev_name;
+ char *gate_addr;
+};
+
+static void tuntap_init(struct net_device *dev, void *data)
+{
+ struct uml_net_private *pri;
+ struct tuntap_data *tpri;
+ struct tuntap_init *init = data;
+
+ pri = netdev_priv(dev);
+ tpri = (struct tuntap_data *) pri->user;
+ tpri->dev_name = init->dev_name;
+ tpri->fixed_config = (init->dev_name != NULL);
+ tpri->gate_addr = init->gate_addr;
+ tpri->fd = -1;
+ tpri->dev = dev;
+
+ printk(KERN_INFO "TUN/TAP backend - ");
+ if (tpri->gate_addr != NULL)
+ printk(KERN_CONT "IP = %s", tpri->gate_addr);
+ printk(KERN_CONT "\n");
+}
+
+static int tuntap_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ return net_read(fd, skb_mac_header(skb),
+ skb->dev->mtu + ETH_HEADER_OTHER);
+}
+
+static int tuntap_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ return net_write(fd, skb->data, skb->len);
+}
+
+const struct net_kern_info tuntap_kern_info = {
+ .init = tuntap_init,
+ .protocol = eth_protocol,
+ .read = tuntap_read,
+ .write = tuntap_write,
+};
+
+int tuntap_setup(char *str, char **mac_out, void *data)
+{
+ struct tuntap_init *init = data;
+
+ *init = ((struct tuntap_init)
+ { .dev_name = NULL,
+ .gate_addr = NULL });
+ if (tap_setup_common(str, "tuntap", &init->dev_name, mac_out,
+ &init->gate_addr))
+ return 0;
+
+ return 1;
+}
+
+static struct transport tuntap_transport = {
+ .list = LIST_HEAD_INIT(tuntap_transport.list),
+ .name = "tuntap",
+ .setup = tuntap_setup,
+ .user = &tuntap_user_info,
+ .kern = &tuntap_kern_info,
+ .private_size = sizeof(struct tuntap_data),
+ .setup_size = sizeof(struct tuntap_init),
+};
+
+static int register_tuntap(void)
+{
+ register_transport(&tuntap_transport);
+ return 0;
+}
+
+late_initcall(register_tuntap);
diff --git a/arch/um/os-Linux/drivers/tuntap_user.c b/arch/um/os-Linux/drivers/tuntap_user.c
new file mode 100644
index 0000000..c2e6e1d
--- /dev/null
+++ b/arch/um/os-Linux/drivers/tuntap_user.c
@@ -0,0 +1,215 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <linux/if_tun.h>
+#include <net/if.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include <sys/uio.h>
+#include <kern_util.h>
+#include <os.h>
+#include "tuntap.h"
+
+static int tuntap_user_init(void *data, void *dev)
+{
+ struct tuntap_data *pri = data;
+
+ pri->dev = dev;
+ return 0;
+}
+
+static void tuntap_add_addr(unsigned char *addr, unsigned char *netmask,
+ void *data)
+{
+ struct tuntap_data *pri = data;
+
+ tap_check_ips(pri->gate_addr, addr);
+ if ((pri->fd == -1) || pri->fixed_config)
+ return;
+ open_addr(addr, netmask, pri->dev_name);
+}
+
+static void tuntap_del_addr(unsigned char *addr, unsigned char *netmask,
+ void *data)
+{
+ struct tuntap_data *pri = data;
+
+ if ((pri->fd == -1) || pri->fixed_config)
+ return;
+ close_addr(addr, netmask, pri->dev_name);
+}
+
+struct tuntap_pre_exec_data {
+ int stdout_fd;
+ int close_me;
+};
+
+static void tuntap_pre_exec(void *arg)
+{
+ struct tuntap_pre_exec_data *data = arg;
+
+ dup2(data->stdout_fd, 1);
+ close(data->close_me);
+}
+
+static int tuntap_open_tramp(char *gate, int *fd_out, int me, int remote,
+ char *buffer, int buffer_len, int *used_out)
+{
+ struct tuntap_pre_exec_data data;
+ char version_buf[sizeof("nnnnn\0")];
+ char *argv[] = { "uml_net", version_buf, "tuntap", "up", gate,
+ NULL };
+ char buf[CMSG_SPACE(sizeof(*fd_out))];
+ struct msghdr msg;
+ struct cmsghdr *cmsg;
+ struct iovec iov;
+ int pid, n, err;
+
+ sprintf(version_buf, "%d", UML_NET_VERSION);
+
+ data.stdout_fd = remote;
+ data.close_me = me;
+
+ pid = run_helper(tuntap_pre_exec, &data, argv);
+
+ if (pid < 0)
+ return -pid;
+
+ close(remote);
+
+ msg.msg_name = NULL;
+ msg.msg_namelen = 0;
+ if (buffer != NULL) {
+ iov = ((struct iovec) { buffer, buffer_len });
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ }
+ else {
+ msg.msg_iov = NULL;
+ msg.msg_iovlen = 0;
+ }
+ msg.msg_control = buf;
+ msg.msg_controllen = sizeof(buf);
+ msg.msg_flags = 0;
+ n = recvmsg(me, &msg, 0);
+ *used_out = n;
+ if (n < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "tuntap_open_tramp : recvmsg failed - "
+ "errno = %d\n", errno);
+ return err;
+ }
+ helper_wait(pid);
+
+ cmsg = CMSG_FIRSTHDR(&msg);
+ if (cmsg == NULL) {
+ printk(UM_KERN_ERR "tuntap_open_tramp : didn't receive a "
+ "message\n");
+ return -EINVAL;
+ }
+ if ((cmsg->cmsg_level != SOL_SOCKET) ||
+ (cmsg->cmsg_type != SCM_RIGHTS)) {
+ printk(UM_KERN_ERR "tuntap_open_tramp : didn't receive a "
+ "descriptor\n");
+ return -EINVAL;
+ }
+ *fd_out = ((int *) CMSG_DATA(cmsg))[0];
+ os_set_exec_close(*fd_out);
+ return 0;
+}
+
+static int tuntap_open(void *data)
+{
+ struct ifreq ifr;
+ struct tuntap_data *pri = data;
+ char *output, *buffer;
+ int err, fds[2], len, used;
+
+ err = tap_open_common(pri->dev, pri->gate_addr);
+ if (err < 0)
+ return err;
+
+ if (pri->fixed_config) {
+ pri->fd = os_open_file("/dev/net/tun",
+ of_cloexec(of_rdwr(OPENFLAGS())), 0);
+ if (pri->fd < 0) {
+ printk(UM_KERN_ERR "Failed to open /dev/net/tun, "
+ "err = %d\n", -pri->fd);
+ return pri->fd;
+ }
+ memset(&ifr, 0, sizeof(ifr));
+ ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
+ strlcpy(ifr.ifr_name, pri->dev_name, sizeof(ifr.ifr_name));
+ if (ioctl(pri->fd, TUNSETIFF, &ifr) < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "TUNSETIFF failed, errno = %d\n",
+ errno);
+ close(pri->fd);
+ return err;
+ }
+ }
+ else {
+ err = socketpair(AF_UNIX, SOCK_DGRAM, 0, fds);
+ if (err) {
+ err = -errno;
+ printk(UM_KERN_ERR "tuntap_open : socketpair failed - "
+ "errno = %d\n", errno);
+ return err;
+ }
+
+ buffer = get_output_buffer(&len);
+ if (buffer != NULL)
+ len--;
+ used = 0;
+
+ err = tuntap_open_tramp(pri->gate_addr, &pri->fd, fds[0],
+ fds[1], buffer, len, &used);
+
+ output = buffer;
+ if (err < 0) {
+ printk("%s", output);
+ free_output_buffer(buffer);
+ printk(UM_KERN_ERR "tuntap_open_tramp failed - "
+ "err = %d\n", -err);
+ return err;
+ }
+
+ pri->dev_name = uml_strdup(buffer);
+ output += IFNAMSIZ;
+ printk("%s", output);
+ free_output_buffer(buffer);
+
+ close(fds[0]);
+ iter_addresses(pri->dev, open_addr, pri->dev_name);
+ }
+
+ return pri->fd;
+}
+
+static void tuntap_close(int fd, void *data)
+{
+ struct tuntap_data *pri = data;
+
+ if (!pri->fixed_config)
+ iter_addresses(pri->dev, close_addr, pri->dev_name);
+ close(fd);
+ pri->fd = -1;
+}
+
+const struct net_user_info tuntap_user_info = {
+ .init = tuntap_user_init,
+ .open = tuntap_open,
+ .close = tuntap_close,
+ .remove = NULL,
+ .add_address = tuntap_add_addr,
+ .delete_address = tuntap_del_addr,
+ .mtu = ETH_MAX_PACKET,
+ .max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
+};
diff --git a/arch/um/os-Linux/elf_aux.c b/arch/um/os-Linux/elf_aux.c
new file mode 100644
index 0000000..1a365dd
--- /dev/null
+++ b/arch/um/os-Linux/elf_aux.c
@@ -0,0 +1,73 @@
+/*
+ * arch/um/kernel/elf_aux.c
+ *
+ * Scan the Elf auxiliary vector provided by the host to extract
+ * information about vsyscall-page, etc.
+ *
+ * Copyright (C) 2004 Fujitsu Siemens Computers GmbH
+ * Author: Bodo Stroesser (bodo.stroesser@fujitsu-siemens.com)
+ */
+#include <elf.h>
+#include <stddef.h>
+#include <init.h>
+#include <elf_user.h>
+#include <mem_user.h>
+
+typedef Elf32_auxv_t elf_auxv_t;
+
+/* These are initialized very early in boot and never changed */
+char * elf_aux_platform;
+extern long elf_aux_hwcap;
+unsigned long vsyscall_ehdr;
+unsigned long vsyscall_end;
+unsigned long __kernel_vsyscall;
+
+__init void scan_elf_aux( char **envp)
+{
+ long page_size = 0;
+ elf_auxv_t * auxv;
+
+ while ( *envp++ != NULL) ;
+
+ for ( auxv = (elf_auxv_t *)envp; auxv->a_type != AT_NULL; auxv++) {
+ switch ( auxv->a_type ) {
+ case AT_SYSINFO:
+ __kernel_vsyscall = auxv->a_un.a_val;
+ /* See if the page is under TASK_SIZE */
+ if (__kernel_vsyscall < (unsigned long) envp)
+ __kernel_vsyscall = 0;
+ break;
+ case AT_SYSINFO_EHDR:
+ vsyscall_ehdr = auxv->a_un.a_val;
+ /* See if the page is under TASK_SIZE */
+ if (vsyscall_ehdr < (unsigned long) envp)
+ vsyscall_ehdr = 0;
+ break;
+ case AT_HWCAP:
+ elf_aux_hwcap = auxv->a_un.a_val;
+ break;
+ case AT_PLATFORM:
+ /* elf.h removed the pointer elements from
+ * a_un, so we have to use a_val, which is
+ * all that's left.
+ */
+ elf_aux_platform =
+ (char *) (long) auxv->a_un.a_val;
+ break;
+ case AT_PAGESZ:
+ page_size = auxv->a_un.a_val;
+ break;
+ }
+ }
+ if ( ! __kernel_vsyscall || ! vsyscall_ehdr ||
+ ! elf_aux_hwcap || ! elf_aux_platform ||
+ ! page_size || (vsyscall_ehdr % page_size) ) {
+ __kernel_vsyscall = 0;
+ vsyscall_ehdr = 0;
+ elf_aux_hwcap = 0;
+ elf_aux_platform = "i586";
+ }
+ else {
+ vsyscall_end = vsyscall_ehdr + page_size;
+ }
+}
diff --git a/arch/um/os-Linux/execvp.c b/arch/um/os-Linux/execvp.c
new file mode 100644
index 0000000..8fb25ca
--- /dev/null
+++ b/arch/um/os-Linux/execvp.c
@@ -0,0 +1,149 @@
+/* Copyright (C) 2006 by Paolo Giarrusso - modified from glibc' execvp.c.
+ Original copyright notice follows:
+
+ Copyright (C) 1991,92,1995-99,2002,2004 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+#include <unistd.h>
+
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <limits.h>
+
+#ifndef TEST
+#include <um_malloc.h>
+#else
+#include <stdio.h>
+#define um_kmalloc malloc
+#endif
+#include <os.h>
+
+/* Execute FILE, searching in the `PATH' environment variable if it contains
+ no slashes, with arguments ARGV and environment from `environ'. */
+int execvp_noalloc(char *buf, const char *file, char *const argv[])
+{
+ if (*file == '\0') {
+ return -ENOENT;
+ }
+
+ if (strchr (file, '/') != NULL) {
+ /* Don't search when it contains a slash. */
+ execv(file, argv);
+ } else {
+ int got_eacces;
+ size_t len, pathlen;
+ char *name, *p;
+ char *path = getenv("PATH");
+ if (path == NULL)
+ path = ":/bin:/usr/bin";
+
+ len = strlen(file) + 1;
+ pathlen = strlen(path);
+ /* Copy the file name at the top. */
+ name = memcpy(buf + pathlen + 1, file, len);
+ /* And add the slash. */
+ *--name = '/';
+
+ got_eacces = 0;
+ p = path;
+ do {
+ char *startp;
+
+ path = p;
+ //Let's avoid this GNU extension.
+ //p = strchrnul (path, ':');
+ p = strchr(path, ':');
+ if (!p)
+ p = strchr(path, '\0');
+
+ if (p == path)
+ /* Two adjacent colons, or a colon at the beginning or the end
+ of `PATH' means to search the current directory. */
+ startp = name + 1;
+ else
+ startp = memcpy(name - (p - path), path, p - path);
+
+ /* Try to execute this name. If it works, execv will not return. */
+ execv(startp, argv);
+
+ /*
+ if (errno == ENOEXEC) {
+ }
+ */
+
+ switch (errno) {
+ case EACCES:
+ /* Record the we got a `Permission denied' error. If we end
+ up finding no executable we can use, we want to diagnose
+ that we did find one but were denied access. */
+ got_eacces = 1;
+ case ENOENT:
+ case ESTALE:
+ case ENOTDIR:
+ /* Those errors indicate the file is missing or not executable
+ by us, in which case we want to just try the next path
+ directory. */
+ case ENODEV:
+ case ETIMEDOUT:
+ /* Some strange filesystems like AFS return even
+ stranger error numbers. They cannot reasonably mean
+ anything else so ignore those, too. */
+ case ENOEXEC:
+ /* We won't go searching for the shell
+ * if it is not executable - the Linux
+ * kernel already handles this enough,
+ * for us. */
+ break;
+
+ default:
+ /* Some other error means we found an executable file, but
+ something went wrong executing it; return the error to our
+ caller. */
+ return -errno;
+ }
+ } while (*p++ != '\0');
+
+ /* We tried every element and none of them worked. */
+ if (got_eacces)
+ /* At least one failure was due to permissions, so report that
+ error. */
+ return -EACCES;
+ }
+
+ /* Return the error from the last attempt (probably ENOENT). */
+ return -errno;
+}
+#ifdef TEST
+int main(int argc, char**argv)
+{
+ char buf[PATH_MAX];
+ int ret;
+ argc--;
+ if (!argc) {
+ fprintf(stderr, "Not enough arguments\n");
+ return 1;
+ }
+ argv++;
+ if (ret = execvp_noalloc(buf, argv[0], argv)) {
+ errno = -ret;
+ perror("execvp_noalloc");
+ }
+ return 0;
+}
+#endif
diff --git a/arch/um/os-Linux/file.c b/arch/um/os-Linux/file.c
new file mode 100644
index 0000000..26e0164
--- /dev/null
+++ b/arch/um/os-Linux/file.c
@@ -0,0 +1,592 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <sys/ioctl.h>
+#include <sys/mount.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/un.h>
+#include <sys/types.h>
+#include <os.h>
+
+static void copy_stat(struct uml_stat *dst, const struct stat64 *src)
+{
+ *dst = ((struct uml_stat) {
+ .ust_dev = src->st_dev, /* device */
+ .ust_ino = src->st_ino, /* inode */
+ .ust_mode = src->st_mode, /* protection */
+ .ust_nlink = src->st_nlink, /* number of hard links */
+ .ust_uid = src->st_uid, /* user ID of owner */
+ .ust_gid = src->st_gid, /* group ID of owner */
+ .ust_size = src->st_size, /* total size, in bytes */
+ .ust_blksize = src->st_blksize, /* blocksize for filesys I/O */
+ .ust_blocks = src->st_blocks, /* number of blocks allocated */
+ .ust_atime = src->st_atime, /* time of last access */
+ .ust_mtime = src->st_mtime, /* time of last modification */
+ .ust_ctime = src->st_ctime, /* time of last change */
+ });
+}
+
+int os_stat_fd(const int fd, struct uml_stat *ubuf)
+{
+ struct stat64 sbuf;
+ int err;
+
+ CATCH_EINTR(err = fstat64(fd, &sbuf));
+ if (err < 0)
+ return -errno;
+
+ if (ubuf != NULL)
+ copy_stat(ubuf, &sbuf);
+ return err;
+}
+
+int os_stat_file(const char *file_name, struct uml_stat *ubuf)
+{
+ struct stat64 sbuf;
+ int err;
+
+ CATCH_EINTR(err = stat64(file_name, &sbuf));
+ if (err < 0)
+ return -errno;
+
+ if (ubuf != NULL)
+ copy_stat(ubuf, &sbuf);
+ return err;
+}
+
+int os_access(const char *file, int mode)
+{
+ int amode, err;
+
+ amode = (mode & OS_ACC_R_OK ? R_OK : 0) |
+ (mode & OS_ACC_W_OK ? W_OK : 0) |
+ (mode & OS_ACC_X_OK ? X_OK : 0) |
+ (mode & OS_ACC_F_OK ? F_OK : 0);
+
+ err = access(file, amode);
+ if (err < 0)
+ return -errno;
+
+ return 0;
+}
+
+/* FIXME? required only by hostaudio (because it passes ioctls verbatim) */
+int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg)
+{
+ int err;
+
+ err = ioctl(fd, cmd, arg);
+ if (err < 0)
+ return -errno;
+
+ return err;
+}
+
+/* FIXME: ensure namebuf in os_get_if_name is big enough */
+int os_get_ifname(int fd, char* namebuf)
+{
+ if (ioctl(fd, SIOCGIFNAME, namebuf) < 0)
+ return -errno;
+
+ return 0;
+}
+
+int os_set_slip(int fd)
+{
+ int disc, sencap;
+
+ disc = N_SLIP;
+ if (ioctl(fd, TIOCSETD, &disc) < 0)
+ return -errno;
+
+ sencap = 0;
+ if (ioctl(fd, SIOCSIFENCAP, &sencap) < 0)
+ return -errno;
+
+ return 0;
+}
+
+int os_mode_fd(int fd, int mode)
+{
+ int err;
+
+ CATCH_EINTR(err = fchmod(fd, mode));
+ if (err < 0)
+ return -errno;
+
+ return 0;
+}
+
+int os_file_type(char *file)
+{
+ struct uml_stat buf;
+ int err;
+
+ err = os_stat_file(file, &buf);
+ if (err < 0)
+ return err;
+
+ if (S_ISDIR(buf.ust_mode))
+ return OS_TYPE_DIR;
+ else if (S_ISLNK(buf.ust_mode))
+ return OS_TYPE_SYMLINK;
+ else if (S_ISCHR(buf.ust_mode))
+ return OS_TYPE_CHARDEV;
+ else if (S_ISBLK(buf.ust_mode))
+ return OS_TYPE_BLOCKDEV;
+ else if (S_ISFIFO(buf.ust_mode))
+ return OS_TYPE_FIFO;
+ else if (S_ISSOCK(buf.ust_mode))
+ return OS_TYPE_SOCK;
+ else return OS_TYPE_FILE;
+}
+
+int os_file_mode(const char *file, struct openflags *mode_out)
+{
+ int err;
+
+ *mode_out = OPENFLAGS();
+
+ err = access(file, W_OK);
+ if (err && (errno != EACCES))
+ return -errno;
+ else if (!err)
+ *mode_out = of_write(*mode_out);
+
+ err = access(file, R_OK);
+ if (err && (errno != EACCES))
+ return -errno;
+ else if (!err)
+ *mode_out = of_read(*mode_out);
+
+ return err;
+}
+
+int os_open_file(const char *file, struct openflags flags, int mode)
+{
+ int fd, err, f = 0;
+
+ if (flags.r && flags.w)
+ f = O_RDWR;
+ else if (flags.r)
+ f = O_RDONLY;
+ else if (flags.w)
+ f = O_WRONLY;
+ else f = 0;
+
+ if (flags.s)
+ f |= O_SYNC;
+ if (flags.c)
+ f |= O_CREAT;
+ if (flags.t)
+ f |= O_TRUNC;
+ if (flags.e)
+ f |= O_EXCL;
+ if (flags.a)
+ f |= O_APPEND;
+
+ fd = open64(file, f, mode);
+ if (fd < 0)
+ return -errno;
+
+ if (flags.cl && fcntl(fd, F_SETFD, 1)) {
+ err = -errno;
+ close(fd);
+ return err;
+ }
+
+ return fd;
+}
+
+int os_connect_socket(const char *name)
+{
+ struct sockaddr_un sock;
+ int fd, err;
+
+ sock.sun_family = AF_UNIX;
+ snprintf(sock.sun_path, sizeof(sock.sun_path), "%s", name);
+
+ fd = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (fd < 0) {
+ err = -errno;
+ goto out;
+ }
+
+ err = connect(fd, (struct sockaddr *) &sock, sizeof(sock));
+ if (err) {
+ err = -errno;
+ goto out_close;
+ }
+
+ return fd;
+
+out_close:
+ close(fd);
+out:
+ return err;
+}
+
+void os_close_file(int fd)
+{
+ close(fd);
+}
+int os_fsync_file(int fd)
+{
+ if (fsync(fd) < 0)
+ return -errno;
+ return 0;
+}
+
+int os_seek_file(int fd, unsigned long long offset)
+{
+ unsigned long long actual;
+
+ actual = lseek64(fd, offset, SEEK_SET);
+ if (actual != offset)
+ return -errno;
+ return 0;
+}
+
+int os_read_file(int fd, void *buf, int len)
+{
+ int n = read(fd, buf, len);
+
+ if (n < 0)
+ return -errno;
+ return n;
+}
+
+int os_write_file(int fd, const void *buf, int len)
+{
+ int n = write(fd, (void *) buf, len);
+
+ if (n < 0)
+ return -errno;
+ return n;
+}
+
+int os_sync_file(int fd)
+{
+ int n = fsync(fd);
+
+ if (n < 0)
+ return -errno;
+ return n;
+}
+
+int os_file_size(const char *file, unsigned long long *size_out)
+{
+ struct uml_stat buf;
+ int err;
+
+ err = os_stat_file(file, &buf);
+ if (err < 0) {
+ printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file,
+ -err);
+ return err;
+ }
+
+ if (S_ISBLK(buf.ust_mode)) {
+ int fd;
+ long blocks;
+
+ fd = open(file, O_RDONLY, 0);
+ if (fd < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "Couldn't open \"%s\", "
+ "errno = %d\n", file, errno);
+ return err;
+ }
+ if (ioctl(fd, BLKGETSIZE, &blocks) < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "Couldn't get the block size of "
+ "\"%s\", errno = %d\n", file, errno);
+ close(fd);
+ return err;
+ }
+ *size_out = ((long long) blocks) * 512;
+ close(fd);
+ }
+ else *size_out = buf.ust_size;
+
+ return 0;
+}
+
+int os_file_modtime(const char *file, unsigned long *modtime)
+{
+ struct uml_stat buf;
+ int err;
+
+ err = os_stat_file(file, &buf);
+ if (err < 0) {
+ printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file,
+ -err);
+ return err;
+ }
+
+ *modtime = buf.ust_mtime;
+ return 0;
+}
+
+int os_set_exec_close(int fd)
+{
+ int err;
+
+ CATCH_EINTR(err = fcntl(fd, F_SETFD, FD_CLOEXEC));
+
+ if (err < 0)
+ return -errno;
+ return err;
+}
+
+int os_pipe(int *fds, int stream, int close_on_exec)
+{
+ int err, type = stream ? SOCK_STREAM : SOCK_DGRAM;
+
+ err = socketpair(AF_UNIX, type, 0, fds);
+ if (err < 0)
+ return -errno;
+
+ if (!close_on_exec)
+ return 0;
+
+ err = os_set_exec_close(fds[0]);
+ if (err < 0)
+ goto error;
+
+ err = os_set_exec_close(fds[1]);
+ if (err < 0)
+ goto error;
+
+ return 0;
+
+ error:
+ printk(UM_KERN_ERR "os_pipe : Setting FD_CLOEXEC failed, err = %d\n",
+ -err);
+ close(fds[1]);
+ close(fds[0]);
+ return err;
+}
+
+int os_set_fd_async(int fd)
+{
+ int err, flags;
+
+ flags = fcntl(fd, F_GETFL);
+ if (flags < 0)
+ return -errno;
+
+ flags |= O_ASYNC | O_NONBLOCK;
+ if (fcntl(fd, F_SETFL, flags) < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "os_set_fd_async : failed to set O_ASYNC "
+ "and O_NONBLOCK on fd # %d, errno = %d\n", fd, errno);
+ return err;
+ }
+
+ if ((fcntl(fd, F_SETSIG, SIGIO) < 0) ||
+ (fcntl(fd, F_SETOWN, os_getpid()) < 0)) {
+ err = -errno;
+ printk(UM_KERN_ERR "os_set_fd_async : Failed to fcntl F_SETOWN "
+ "(or F_SETSIG) fd %d, errno = %d\n", fd, errno);
+ return err;
+ }
+
+ return 0;
+}
+
+int os_clear_fd_async(int fd)
+{
+ int flags;
+
+ flags = fcntl(fd, F_GETFL);
+ if (flags < 0)
+ return -errno;
+
+ flags &= ~(O_ASYNC | O_NONBLOCK);
+ if (fcntl(fd, F_SETFL, flags) < 0)
+ return -errno;
+ return 0;
+}
+
+int os_set_fd_block(int fd, int blocking)
+{
+ int flags;
+
+ flags = fcntl(fd, F_GETFL);
+ if (flags < 0)
+ return -errno;
+
+ if (blocking)
+ flags &= ~O_NONBLOCK;
+ else
+ flags |= O_NONBLOCK;
+
+ if (fcntl(fd, F_SETFL, flags) < 0)
+ return -errno;
+
+ return 0;
+}
+
+int os_accept_connection(int fd)
+{
+ int new;
+
+ new = accept(fd, NULL, 0);
+ if (new < 0)
+ return -errno;
+ return new;
+}
+
+#ifndef SHUT_RD
+#define SHUT_RD 0
+#endif
+
+#ifndef SHUT_WR
+#define SHUT_WR 1
+#endif
+
+#ifndef SHUT_RDWR
+#define SHUT_RDWR 2
+#endif
+
+int os_shutdown_socket(int fd, int r, int w)
+{
+ int what, err;
+
+ if (r && w)
+ what = SHUT_RDWR;
+ else if (r)
+ what = SHUT_RD;
+ else if (w)
+ what = SHUT_WR;
+ else
+ return -EINVAL;
+
+ err = shutdown(fd, what);
+ if (err < 0)
+ return -errno;
+ return 0;
+}
+
+int os_rcv_fd(int fd, int *helper_pid_out)
+{
+ int new, n;
+ char buf[CMSG_SPACE(sizeof(new))];
+ struct msghdr msg;
+ struct cmsghdr *cmsg;
+ struct iovec iov;
+
+ msg.msg_name = NULL;
+ msg.msg_namelen = 0;
+ iov = ((struct iovec) { .iov_base = helper_pid_out,
+ .iov_len = sizeof(*helper_pid_out) });
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = buf;
+ msg.msg_controllen = sizeof(buf);
+ msg.msg_flags = 0;
+
+ n = recvmsg(fd, &msg, 0);
+ if (n < 0)
+ return -errno;
+ else if (n != iov.iov_len)
+ *helper_pid_out = -1;
+
+ cmsg = CMSG_FIRSTHDR(&msg);
+ if (cmsg == NULL) {
+ printk(UM_KERN_ERR "rcv_fd didn't receive anything, "
+ "error = %d\n", errno);
+ return -1;
+ }
+ if ((cmsg->cmsg_level != SOL_SOCKET) ||
+ (cmsg->cmsg_type != SCM_RIGHTS)) {
+ printk(UM_KERN_ERR "rcv_fd didn't receive a descriptor\n");
+ return -1;
+ }
+
+ new = ((int *) CMSG_DATA(cmsg))[0];
+ return new;
+}
+
+int os_create_unix_socket(const char *file, int len, int close_on_exec)
+{
+ struct sockaddr_un addr;
+ int sock, err;
+
+ sock = socket(PF_UNIX, SOCK_DGRAM, 0);
+ if (sock < 0)
+ return -errno;
+
+ if (close_on_exec) {
+ err = os_set_exec_close(sock);
+ if (err < 0)
+ printk(UM_KERN_ERR "create_unix_socket : "
+ "close_on_exec failed, err = %d", -err);
+ }
+
+ addr.sun_family = AF_UNIX;
+
+ snprintf(addr.sun_path, len, "%s", file);
+
+ err = bind(sock, (struct sockaddr *) &addr, sizeof(addr));
+ if (err < 0)
+ return -errno;
+
+ return sock;
+}
+
+void os_flush_stdout(void)
+{
+ fflush(stdout);
+}
+
+int os_lock_file(int fd, int excl)
+{
+ int type = excl ? F_WRLCK : F_RDLCK;
+ struct flock lock = ((struct flock) { .l_type = type,
+ .l_whence = SEEK_SET,
+ .l_start = 0,
+ .l_len = 0 } );
+ int err, save;
+
+ err = fcntl(fd, F_SETLK, &lock);
+ if (!err)
+ goto out;
+
+ save = -errno;
+ err = fcntl(fd, F_GETLK, &lock);
+ if (err) {
+ err = -errno;
+ goto out;
+ }
+
+ printk(UM_KERN_ERR "F_SETLK failed, file already locked by pid %d\n",
+ lock.l_pid);
+ err = save;
+ out:
+ return err;
+}
+
+unsigned os_major(unsigned long long dev)
+{
+ return major(dev);
+}
+
+unsigned os_minor(unsigned long long dev)
+{
+ return minor(dev);
+}
+
+unsigned long long os_makedev(unsigned major, unsigned minor)
+{
+ return makedev(major, minor);
+}
diff --git a/arch/um/os-Linux/helper.c b/arch/um/os-Linux/helper.c
new file mode 100644
index 0000000..3f02d42
--- /dev/null
+++ b/arch/um/os-Linux/helper.c
@@ -0,0 +1,164 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sched.h>
+#include <linux/limits.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include <kern_util.h>
+#include <os.h>
+#include <um_malloc.h>
+
+struct helper_data {
+ void (*pre_exec)(void*);
+ void *pre_data;
+ char **argv;
+ int fd;
+ char *buf;
+};
+
+static int helper_child(void *arg)
+{
+ struct helper_data *data = arg;
+ char **argv = data->argv;
+ int err, ret;
+
+ if (data->pre_exec != NULL)
+ (*data->pre_exec)(data->pre_data);
+ err = execvp_noalloc(data->buf, argv[0], argv);
+
+ /* If the exec succeeds, we don't get here */
+ CATCH_EINTR(ret = write(data->fd, &err, sizeof(err)));
+
+ return 0;
+}
+
+/* Returns either the pid of the child process we run or -E* on failure. */
+int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv)
+{
+ struct helper_data data;
+ unsigned long stack, sp;
+ int pid, fds[2], ret, n;
+
+ stack = alloc_stack(0, __cant_sleep());
+ if (stack == 0)
+ return -ENOMEM;
+
+ ret = socketpair(AF_UNIX, SOCK_STREAM, 0, fds);
+ if (ret < 0) {
+ ret = -errno;
+ printk(UM_KERN_ERR "run_helper : pipe failed, errno = %d\n",
+ errno);
+ goto out_free;
+ }
+
+ ret = os_set_exec_close(fds[1]);
+ if (ret < 0) {
+ printk(UM_KERN_ERR "run_helper : setting FD_CLOEXEC failed, "
+ "ret = %d\n", -ret);
+ goto out_close;
+ }
+
+ sp = stack + UM_KERN_PAGE_SIZE - sizeof(void *);
+ data.pre_exec = pre_exec;
+ data.pre_data = pre_data;
+ data.argv = argv;
+ data.fd = fds[1];
+ data.buf = __cant_sleep() ? uml_kmalloc(PATH_MAX, UM_GFP_ATOMIC) :
+ uml_kmalloc(PATH_MAX, UM_GFP_KERNEL);
+ pid = clone(helper_child, (void *) sp, CLONE_VM, &data);
+ if (pid < 0) {
+ ret = -errno;
+ printk(UM_KERN_ERR "run_helper : clone failed, errno = %d\n",
+ errno);
+ goto out_free2;
+ }
+
+ close(fds[1]);
+ fds[1] = -1;
+
+ /*
+ * Read the errno value from the child, if the exec failed, or get 0 if
+ * the exec succeeded because the pipe fd was set as close-on-exec.
+ */
+ n = read(fds[0], &ret, sizeof(ret));
+ if (n == 0) {
+ ret = pid;
+ } else {
+ if (n < 0) {
+ n = -errno;
+ printk(UM_KERN_ERR "run_helper : read on pipe failed, "
+ "ret = %d\n", -n);
+ ret = n;
+ }
+ CATCH_EINTR(waitpid(pid, NULL, __WALL));
+ }
+
+out_free2:
+ kfree(data.buf);
+out_close:
+ if (fds[1] != -1)
+ close(fds[1]);
+ close(fds[0]);
+out_free:
+ free_stack(stack, 0);
+ return ret;
+}
+
+int run_helper_thread(int (*proc)(void *), void *arg, unsigned int flags,
+ unsigned long *stack_out)
+{
+ unsigned long stack, sp;
+ int pid, status, err;
+
+ stack = alloc_stack(0, __cant_sleep());
+ if (stack == 0)
+ return -ENOMEM;
+
+ sp = stack + UM_KERN_PAGE_SIZE - sizeof(void *);
+ pid = clone(proc, (void *) sp, flags, arg);
+ if (pid < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "run_helper_thread : clone failed, "
+ "errno = %d\n", errno);
+ return err;
+ }
+ if (stack_out == NULL) {
+ CATCH_EINTR(pid = waitpid(pid, &status, __WALL));
+ if (pid < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "run_helper_thread - wait failed, "
+ "errno = %d\n", errno);
+ pid = err;
+ }
+ if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0))
+ printk(UM_KERN_ERR "run_helper_thread - thread "
+ "returned status 0x%x\n", status);
+ free_stack(stack, 0);
+ } else
+ *stack_out = stack;
+ return pid;
+}
+
+int helper_wait(int pid)
+{
+ int ret, status;
+ int wflags = __WALL;
+
+ CATCH_EINTR(ret = waitpid(pid, &status, wflags));
+ if (ret < 0) {
+ printk(UM_KERN_ERR "helper_wait : waitpid process %d failed, "
+ "errno = %d\n", pid, errno);
+ return -errno;
+ } else if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
+ printk(UM_KERN_ERR "helper_wait : process %d exited with "
+ "status 0x%x\n", pid, status);
+ return -ECHILD;
+ } else
+ return 0;
+}
diff --git a/arch/um/os-Linux/irq.c b/arch/um/os-Linux/irq.c
new file mode 100644
index 0000000..b9afb74
--- /dev/null
+++ b/arch/um/os-Linux/irq.c
@@ -0,0 +1,135 @@
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <stdlib.h>
+#include <errno.h>
+#include <poll.h>
+#include <signal.h>
+#include <string.h>
+#include <irq_user.h>
+#include <os.h>
+#include <um_malloc.h>
+
+/*
+ * Locked by irq_lock in arch/um/kernel/irq.c. Changed by os_create_pollfd
+ * and os_free_irq_by_cb, which are called under irq_lock.
+ */
+static struct pollfd *pollfds = NULL;
+static int pollfds_num = 0;
+static int pollfds_size = 0;
+
+int os_waiting_for_events(struct irq_fd *active_fds)
+{
+ struct irq_fd *irq_fd;
+ int i, n, err;
+
+ n = poll(pollfds, pollfds_num, 0);
+ if (n < 0) {
+ err = -errno;
+ if (errno != EINTR)
+ printk(UM_KERN_ERR "os_waiting_for_events:"
+ " poll returned %d, errno = %d\n", n, errno);
+ return err;
+ }
+
+ if (n == 0)
+ return 0;
+
+ irq_fd = active_fds;
+
+ for (i = 0; i < pollfds_num; i++) {
+ if (pollfds[i].revents != 0) {
+ irq_fd->current_events = pollfds[i].revents;
+ pollfds[i].fd = -1;
+ }
+ irq_fd = irq_fd->next;
+ }
+ return n;
+}
+
+int os_create_pollfd(int fd, int events, void *tmp_pfd, int size_tmpfds)
+{
+ if (pollfds_num == pollfds_size) {
+ if (size_tmpfds <= pollfds_size * sizeof(pollfds[0])) {
+ /* return min size needed for new pollfds area */
+ return (pollfds_size + 1) * sizeof(pollfds[0]);
+ }
+
+ if (pollfds != NULL) {
+ memcpy(tmp_pfd, pollfds,
+ sizeof(pollfds[0]) * pollfds_size);
+ /* remove old pollfds */
+ kfree(pollfds);
+ }
+ pollfds = tmp_pfd;
+ pollfds_size++;
+ } else
+ kfree(tmp_pfd); /* remove not used tmp_pfd */
+
+ pollfds[pollfds_num] = ((struct pollfd) { .fd = fd,
+ .events = events,
+ .revents = 0 });
+ pollfds_num++;
+
+ return 0;
+}
+
+void os_free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg,
+ struct irq_fd *active_fds, struct irq_fd ***last_irq_ptr2)
+{
+ struct irq_fd **prev;
+ int i = 0;
+
+ prev = &active_fds;
+ while (*prev != NULL) {
+ if ((*test)(*prev, arg)) {
+ struct irq_fd *old_fd = *prev;
+ if ((pollfds[i].fd != -1) &&
+ (pollfds[i].fd != (*prev)->fd)) {
+ printk(UM_KERN_ERR "os_free_irq_by_cb - "
+ "mismatch between active_fds and "
+ "pollfds, fd %d vs %d\n",
+ (*prev)->fd, pollfds[i].fd);
+ goto out;
+ }
+
+ pollfds_num--;
+
+ /*
+ * This moves the *whole* array after pollfds[i]
+ * (though it doesn't spot as such)!
+ */
+ memmove(&pollfds[i], &pollfds[i + 1],
+ (pollfds_num - i) * sizeof(pollfds[0]));
+ if (*last_irq_ptr2 == &old_fd->next)
+ *last_irq_ptr2 = prev;
+
+ *prev = (*prev)->next;
+ if (old_fd->type == IRQ_WRITE)
+ ignore_sigio_fd(old_fd->fd);
+ kfree(old_fd);
+ continue;
+ }
+ prev = &(*prev)->next;
+ i++;
+ }
+ out:
+ return;
+}
+
+int os_get_pollfd(int i)
+{
+ return pollfds[i].fd;
+}
+
+void os_set_pollfd(int i, int fd)
+{
+ pollfds[i].fd = fd;
+}
+
+void os_set_ioignore(void)
+{
+ signal(SIGIO, SIG_IGN);
+}
diff --git a/arch/um/os-Linux/main.c b/arch/um/os-Linux/main.c
new file mode 100644
index 0000000..9d499de
--- /dev/null
+++ b/arch/um/os-Linux/main.c
@@ -0,0 +1,267 @@
+/*
+ * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <signal.h>
+#include <string.h>
+#include <sys/resource.h>
+#include <as-layout.h>
+#include <init.h>
+#include <kern_util.h>
+#include <os.h>
+#include <um_malloc.h>
+
+#define PGD_BOUND (4 * 1024 * 1024)
+#define STACKSIZE (8 * 1024 * 1024)
+#define THREAD_NAME_LEN (256)
+
+long elf_aux_hwcap;
+
+static void set_stklim(void)
+{
+ struct rlimit lim;
+
+ if (getrlimit(RLIMIT_STACK, &lim) < 0) {
+ perror("getrlimit");
+ exit(1);
+ }
+ if ((lim.rlim_cur == RLIM_INFINITY) || (lim.rlim_cur > STACKSIZE)) {
+ lim.rlim_cur = STACKSIZE;
+ if (setrlimit(RLIMIT_STACK, &lim) < 0) {
+ perror("setrlimit");
+ exit(1);
+ }
+ }
+}
+
+static __init void do_uml_initcalls(void)
+{
+ initcall_t *call;
+
+ call = &__uml_initcall_start;
+ while (call < &__uml_initcall_end) {
+ (*call)();
+ call++;
+ }
+}
+
+static void last_ditch_exit(int sig)
+{
+ uml_cleanup();
+ exit(1);
+}
+
+static void install_fatal_handler(int sig)
+{
+ struct sigaction action;
+
+ /* All signals are enabled in this handler ... */
+ sigemptyset(&action.sa_mask);
+
+ /*
+ * ... including the signal being handled, plus we want the
+ * handler reset to the default behavior, so that if an exit
+ * handler is hanging for some reason, the UML will just die
+ * after this signal is sent a second time.
+ */
+ action.sa_flags = SA_RESETHAND | SA_NODEFER;
+ action.sa_restorer = NULL;
+ action.sa_handler = last_ditch_exit;
+ if (sigaction(sig, &action, NULL) < 0) {
+ printf("failed to install handler for signal %d - errno = %d\n",
+ sig, errno);
+ exit(1);
+ }
+}
+
+#define UML_LIB_PATH ":" OS_LIB_PATH "/uml"
+
+static void setup_env_path(void)
+{
+ char *new_path = NULL;
+ char *old_path = NULL;
+ int path_len = 0;
+
+ old_path = getenv("PATH");
+ /*
+ * if no PATH variable is set or it has an empty value
+ * just use the default + /usr/lib/uml
+ */
+ if (!old_path || (path_len = strlen(old_path)) == 0) {
+ if (putenv("PATH=:/bin:/usr/bin/" UML_LIB_PATH))
+ perror("couldn't putenv");
+ return;
+ }
+
+ /* append /usr/lib/uml to the existing path */
+ path_len += strlen("PATH=" UML_LIB_PATH) + 1;
+ new_path = malloc(path_len);
+ if (!new_path) {
+ perror("couldn't malloc to set a new PATH");
+ return;
+ }
+ snprintf(new_path, path_len, "PATH=%s" UML_LIB_PATH, old_path);
+ if (putenv(new_path)) {
+ perror("couldn't putenv to set a new PATH");
+ free(new_path);
+ }
+}
+
+extern void scan_elf_aux( char **envp);
+
+int __init main(int argc, char **argv, char **envp)
+{
+ char **new_argv;
+ int ret, i, err;
+
+ set_stklim();
+
+ setup_env_path();
+
+ setsid();
+
+ new_argv = malloc((argc + 1) * sizeof(char *));
+ if (new_argv == NULL) {
+ perror("Mallocing argv");
+ exit(1);
+ }
+ for (i = 0; i < argc; i++) {
+ new_argv[i] = strdup(argv[i]);
+ if (new_argv[i] == NULL) {
+ perror("Mallocing an arg");
+ exit(1);
+ }
+ }
+ new_argv[argc] = NULL;
+
+ /*
+ * Allow these signals to bring down a UML if all other
+ * methods of control fail.
+ */
+ install_fatal_handler(SIGINT);
+ install_fatal_handler(SIGTERM);
+
+#ifdef CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA
+ scan_elf_aux(envp);
+#endif
+
+ do_uml_initcalls();
+ change_sig(SIGPIPE, 0);
+ ret = linux_main(argc, argv);
+
+ /*
+ * Disable SIGPROF - I have no idea why libc doesn't do this or turn
+ * off the profiling time, but UML dies with a SIGPROF just before
+ * exiting when profiling is active.
+ */
+ change_sig(SIGPROF, 0);
+
+ /*
+ * This signal stuff used to be in the reboot case. However,
+ * sometimes a timer signal can come in when we're halting (reproducably
+ * when writing out gcov information, presumably because that takes
+ * some time) and cause a segfault.
+ */
+
+ /* stop timers and set timer signal to be ignored */
+ os_timer_disable();
+
+ /* disable SIGIO for the fds and set SIGIO to be ignored */
+ err = deactivate_all_fds();
+ if (err)
+ printf("deactivate_all_fds failed, errno = %d\n", -err);
+
+ /*
+ * Let any pending signals fire now. This ensures
+ * that they won't be delivered after the exec, when
+ * they are definitely not expected.
+ */
+ unblock_signals();
+
+ /* Reboot */
+ if (ret) {
+ printf("\n");
+ execvp(new_argv[0], new_argv);
+ perror("Failed to exec kernel");
+ ret = 1;
+ }
+ printf("\n");
+ return uml_exitcode;
+}
+
+extern void *__real_malloc(int);
+
+void *__wrap_malloc(int size)
+{
+ void *ret;
+
+ if (!kmalloc_ok)
+ return __real_malloc(size);
+ else if (size <= UM_KERN_PAGE_SIZE)
+ /* finding contiguous pages can be hard*/
+ ret = uml_kmalloc(size, UM_GFP_KERNEL);
+ else ret = vmalloc(size);
+
+ /*
+ * glibc people insist that if malloc fails, errno should be
+ * set by malloc as well. So we do.
+ */
+ if (ret == NULL)
+ errno = ENOMEM;
+
+ return ret;
+}
+
+void *__wrap_calloc(int n, int size)
+{
+ void *ptr = __wrap_malloc(n * size);
+
+ if (ptr == NULL)
+ return NULL;
+ memset(ptr, 0, n * size);
+ return ptr;
+}
+
+extern void __real_free(void *);
+
+extern unsigned long high_physmem;
+
+void __wrap_free(void *ptr)
+{
+ unsigned long addr = (unsigned long) ptr;
+
+ /*
+ * We need to know how the allocation happened, so it can be correctly
+ * freed. This is done by seeing what region of memory the pointer is
+ * in -
+ * physical memory - kmalloc/kfree
+ * kernel virtual memory - vmalloc/vfree
+ * anywhere else - malloc/free
+ * If kmalloc is not yet possible, then either high_physmem and/or
+ * end_vm are still 0 (as at startup), in which case we call free, or
+ * we have set them, but anyway addr has not been allocated from those
+ * areas. So, in both cases __real_free is called.
+ *
+ * CAN_KMALLOC is checked because it would be bad to free a buffer
+ * with kmalloc/vmalloc after they have been turned off during
+ * shutdown.
+ * XXX: However, we sometimes shutdown CAN_KMALLOC temporarily, so
+ * there is a possibility for memory leaks.
+ */
+
+ if ((addr >= uml_physmem) && (addr < high_physmem)) {
+ if (kmalloc_ok)
+ kfree(ptr);
+ }
+ else if ((addr >= start_vm) && (addr < end_vm)) {
+ if (kmalloc_ok)
+ vfree(ptr);
+ }
+ else __real_free(ptr);
+}
diff --git a/arch/um/os-Linux/mem.c b/arch/um/os-Linux/mem.c
new file mode 100644
index 0000000..897e9ad
--- /dev/null
+++ b/arch/um/os-Linux/mem.c
@@ -0,0 +1,205 @@
+/*
+ * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <sys/vfs.h>
+#include <linux/magic.h>
+#include <init.h>
+#include <os.h>
+
+/* Set by make_tempfile() during early boot. */
+static char *tempdir = NULL;
+
+/* Check if dir is on tmpfs. Return 0 if yes, -1 if no or error. */
+static int __init check_tmpfs(const char *dir)
+{
+ struct statfs st;
+
+ printf("Checking if %s is on tmpfs...", dir);
+ if (statfs(dir, &st) < 0) {
+ printf("%s\n", strerror(errno));
+ } else if (st.f_type != TMPFS_MAGIC) {
+ printf("no\n");
+ } else {
+ printf("OK\n");
+ return 0;
+ }
+ return -1;
+}
+
+/*
+ * Choose the tempdir to use. We want something on tmpfs so that our memory is
+ * not subject to the host's vm.dirty_ratio. If a tempdir is specified in the
+ * environment, we use that even if it's not on tmpfs, but we warn the user.
+ * Otherwise, we try common tmpfs locations, and if no tmpfs directory is found
+ * then we fall back to /tmp.
+ */
+static char * __init choose_tempdir(void)
+{
+ static const char * const vars[] = {
+ "TMPDIR",
+ "TMP",
+ "TEMP",
+ NULL
+ };
+ static const char fallback_dir[] = "/tmp";
+ static const char * const tmpfs_dirs[] = {
+ "/dev/shm",
+ fallback_dir,
+ NULL
+ };
+ int i;
+ const char *dir;
+
+ printf("Checking environment variables for a tempdir...");
+ for (i = 0; vars[i]; i++) {
+ dir = getenv(vars[i]);
+ if ((dir != NULL) && (*dir != '\0')) {
+ printf("%s\n", dir);
+ if (check_tmpfs(dir) >= 0)
+ goto done;
+ else
+ goto warn;
+ }
+ }
+ printf("none found\n");
+
+ for (i = 0; tmpfs_dirs[i]; i++) {
+ dir = tmpfs_dirs[i];
+ if (check_tmpfs(dir) >= 0)
+ goto done;
+ }
+
+ dir = fallback_dir;
+warn:
+ printf("Warning: tempdir %s is not on tmpfs\n", dir);
+done:
+ /* Make a copy since getenv results may not remain valid forever. */
+ return strdup(dir);
+}
+
+/*
+ * Create an unlinked tempfile in a suitable tempdir. template must be the
+ * basename part of the template with a leading '/'.
+ */
+static int __init make_tempfile(const char *template)
+{
+ char *tempname;
+ int fd;
+
+ if (tempdir == NULL) {
+ tempdir = choose_tempdir();
+ if (tempdir == NULL) {
+ fprintf(stderr, "Failed to choose tempdir: %s\n",
+ strerror(errno));
+ return -1;
+ }
+ }
+
+ tempname = malloc(strlen(tempdir) + strlen(template) + 1);
+ if (tempname == NULL)
+ return -1;
+
+ strcpy(tempname, tempdir);
+ strcat(tempname, template);
+ fd = mkstemp(tempname);
+ if (fd < 0) {
+ fprintf(stderr, "open - cannot create %s: %s\n", tempname,
+ strerror(errno));
+ goto out;
+ }
+ if (unlink(tempname) < 0) {
+ perror("unlink");
+ goto close;
+ }
+ free(tempname);
+ return fd;
+close:
+ close(fd);
+out:
+ free(tempname);
+ return -1;
+}
+
+#define TEMPNAME_TEMPLATE "/vm_file-XXXXXX"
+
+static int __init create_tmp_file(unsigned long long len)
+{
+ int fd, err;
+ char zero;
+
+ fd = make_tempfile(TEMPNAME_TEMPLATE);
+ if (fd < 0)
+ exit(1);
+
+ err = fchmod(fd, 0777);
+ if (err < 0) {
+ perror("fchmod");
+ exit(1);
+ }
+
+ /*
+ * Seek to len - 1 because writing a character there will
+ * increase the file size by one byte, to the desired length.
+ */
+ if (lseek64(fd, len - 1, SEEK_SET) < 0) {
+ perror("lseek64");
+ exit(1);
+ }
+
+ zero = 0;
+
+ err = write(fd, &zero, 1);
+ if (err != 1) {
+ perror("write");
+ exit(1);
+ }
+
+ return fd;
+}
+
+int __init create_mem_file(unsigned long long len)
+{
+ int err, fd;
+
+ fd = create_tmp_file(len);
+
+ err = os_set_exec_close(fd);
+ if (err < 0) {
+ errno = -err;
+ perror("exec_close");
+ }
+ return fd;
+}
+
+void __init check_tmpexec(void)
+{
+ void *addr;
+ int err, fd = create_tmp_file(UM_KERN_PAGE_SIZE);
+
+ addr = mmap(NULL, UM_KERN_PAGE_SIZE,
+ PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE, fd, 0);
+ printf("Checking PROT_EXEC mmap in %s...", tempdir);
+ if (addr == MAP_FAILED) {
+ err = errno;
+ printf("%s\n", strerror(err));
+ close(fd);
+ if (err == EPERM)
+ printf("%s must be not mounted noexec\n", tempdir);
+ exit(1);
+ }
+ printf("OK\n");
+ munmap(addr, UM_KERN_PAGE_SIZE);
+
+ close(fd);
+}
diff --git a/arch/um/os-Linux/process.c b/arch/um/os-Linux/process.c
new file mode 100644
index 0000000..b3e0d40
--- /dev/null
+++ b/arch/um/os-Linux/process.c
@@ -0,0 +1,287 @@
+/*
+ * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <signal.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <sys/ptrace.h>
+#include <sys/wait.h>
+#include <asm/unistd.h>
+#include <init.h>
+#include <longjmp.h>
+#include <os.h>
+
+#define ARBITRARY_ADDR -1
+#define FAILURE_PID -1
+
+#define STAT_PATH_LEN sizeof("/proc/#######/stat\0")
+#define COMM_SCANF "%*[^)])"
+
+unsigned long os_process_pc(int pid)
+{
+ char proc_stat[STAT_PATH_LEN], buf[256];
+ unsigned long pc = ARBITRARY_ADDR;
+ int fd, err;
+
+ sprintf(proc_stat, "/proc/%d/stat", pid);
+ fd = open(proc_stat, O_RDONLY, 0);
+ if (fd < 0) {
+ printk(UM_KERN_ERR "os_process_pc - couldn't open '%s', "
+ "errno = %d\n", proc_stat, errno);
+ goto out;
+ }
+ CATCH_EINTR(err = read(fd, buf, sizeof(buf)));
+ if (err < 0) {
+ printk(UM_KERN_ERR "os_process_pc - couldn't read '%s', "
+ "err = %d\n", proc_stat, errno);
+ goto out_close;
+ }
+ os_close_file(fd);
+ pc = ARBITRARY_ADDR;
+ if (sscanf(buf, "%*d " COMM_SCANF " %*c %*d %*d %*d %*d %*d %*d %*d "
+ "%*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d "
+ "%*d %*d %*d %*d %*d %lu", &pc) != 1)
+ printk(UM_KERN_ERR "os_process_pc - couldn't find pc in '%s'\n",
+ buf);
+ out_close:
+ close(fd);
+ out:
+ return pc;
+}
+
+int os_process_parent(int pid)
+{
+ char stat[STAT_PATH_LEN];
+ char data[256];
+ int parent = FAILURE_PID, n, fd;
+
+ if (pid == -1)
+ return parent;
+
+ snprintf(stat, sizeof(stat), "/proc/%d/stat", pid);
+ fd = open(stat, O_RDONLY, 0);
+ if (fd < 0) {
+ printk(UM_KERN_ERR "Couldn't open '%s', errno = %d\n", stat,
+ errno);
+ return parent;
+ }
+
+ CATCH_EINTR(n = read(fd, data, sizeof(data)));
+ close(fd);
+
+ if (n < 0) {
+ printk(UM_KERN_ERR "Couldn't read '%s', errno = %d\n", stat,
+ errno);
+ return parent;
+ }
+
+ parent = FAILURE_PID;
+ n = sscanf(data, "%*d " COMM_SCANF " %*c %d", &parent);
+ if (n != 1)
+ printk(UM_KERN_ERR "Failed to scan '%s'\n", data);
+
+ return parent;
+}
+
+void os_alarm_process(int pid)
+{
+ kill(pid, SIGALRM);
+}
+
+void os_stop_process(int pid)
+{
+ kill(pid, SIGSTOP);
+}
+
+void os_kill_process(int pid, int reap_child)
+{
+ kill(pid, SIGKILL);
+ if (reap_child)
+ CATCH_EINTR(waitpid(pid, NULL, __WALL));
+}
+
+/* Kill off a ptraced child by all means available. kill it normally first,
+ * then PTRACE_KILL it, then PTRACE_CONT it in case it's in a run state from
+ * which it can't exit directly.
+ */
+
+void os_kill_ptraced_process(int pid, int reap_child)
+{
+ kill(pid, SIGKILL);
+ ptrace(PTRACE_KILL, pid);
+ ptrace(PTRACE_CONT, pid);
+ if (reap_child)
+ CATCH_EINTR(waitpid(pid, NULL, __WALL));
+}
+
+/* Don't use the glibc version, which caches the result in TLS. It misses some
+ * syscalls, and also breaks with clone(), which does not unshare the TLS.
+ */
+
+int os_getpid(void)
+{
+ return syscall(__NR_getpid);
+}
+
+int os_getpgrp(void)
+{
+ return getpgrp();
+}
+
+int os_map_memory(void *virt, int fd, unsigned long long off, unsigned long len,
+ int r, int w, int x)
+{
+ void *loc;
+ int prot;
+
+ prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
+ (x ? PROT_EXEC : 0);
+
+ loc = mmap64((void *) virt, len, prot, MAP_SHARED | MAP_FIXED,
+ fd, off);
+ if (loc == MAP_FAILED)
+ return -errno;
+ return 0;
+}
+
+int os_protect_memory(void *addr, unsigned long len, int r, int w, int x)
+{
+ int prot = ((r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
+ (x ? PROT_EXEC : 0));
+
+ if (mprotect(addr, len, prot) < 0)
+ return -errno;
+
+ return 0;
+}
+
+int os_unmap_memory(void *addr, int len)
+{
+ int err;
+
+ err = munmap(addr, len);
+ if (err < 0)
+ return -errno;
+ return 0;
+}
+
+#ifndef MADV_REMOVE
+#define MADV_REMOVE KERNEL_MADV_REMOVE
+#endif
+
+int os_drop_memory(void *addr, int length)
+{
+ int err;
+
+ err = madvise(addr, length, MADV_REMOVE);
+ if (err < 0)
+ err = -errno;
+ return err;
+}
+
+int __init can_drop_memory(void)
+{
+ void *addr;
+ int fd, ok = 0;
+
+ printk(UM_KERN_INFO "Checking host MADV_REMOVE support...");
+ fd = create_mem_file(UM_KERN_PAGE_SIZE);
+ if (fd < 0) {
+ printk(UM_KERN_ERR "Creating test memory file failed, "
+ "err = %d\n", -fd);
+ goto out;
+ }
+
+ addr = mmap64(NULL, UM_KERN_PAGE_SIZE, PROT_READ | PROT_WRITE,
+ MAP_SHARED, fd, 0);
+ if (addr == MAP_FAILED) {
+ printk(UM_KERN_ERR "Mapping test memory file failed, "
+ "err = %d\n", -errno);
+ goto out_close;
+ }
+
+ if (madvise(addr, UM_KERN_PAGE_SIZE, MADV_REMOVE) != 0) {
+ printk(UM_KERN_ERR "MADV_REMOVE failed, err = %d\n", -errno);
+ goto out_unmap;
+ }
+
+ printk(UM_KERN_CONT "OK\n");
+ ok = 1;
+
+out_unmap:
+ munmap(addr, UM_KERN_PAGE_SIZE);
+out_close:
+ close(fd);
+out:
+ return ok;
+}
+
+static int os_page_mincore(void *addr)
+{
+ char vec[2];
+ int ret;
+
+ ret = mincore(addr, UM_KERN_PAGE_SIZE, vec);
+ if (ret < 0) {
+ if (errno == ENOMEM || errno == EINVAL)
+ return 0;
+ else
+ return -errno;
+ }
+
+ return vec[0] & 1;
+}
+
+int os_mincore(void *addr, unsigned long len)
+{
+ char *vec;
+ int ret, i;
+
+ if (len <= UM_KERN_PAGE_SIZE)
+ return os_page_mincore(addr);
+
+ vec = calloc(1, (len + UM_KERN_PAGE_SIZE - 1) / UM_KERN_PAGE_SIZE);
+ if (!vec)
+ return -ENOMEM;
+
+ ret = mincore(addr, UM_KERN_PAGE_SIZE, vec);
+ if (ret < 0) {
+ if (errno == ENOMEM || errno == EINVAL)
+ ret = 0;
+ else
+ ret = -errno;
+
+ goto out;
+ }
+
+ for (i = 0; i < ((len + UM_KERN_PAGE_SIZE - 1) / UM_KERN_PAGE_SIZE); i++) {
+ if (!(vec[i] & 1)) {
+ ret = 0;
+ goto out;
+ }
+ }
+
+ ret = 1;
+out:
+ free(vec);
+ return ret;
+}
+
+void init_new_thread_signals(void)
+{
+ set_handler(SIGSEGV);
+ set_handler(SIGTRAP);
+ set_handler(SIGFPE);
+ set_handler(SIGILL);
+ set_handler(SIGBUS);
+ signal(SIGHUP, SIG_IGN);
+ set_handler(SIGIO);
+ signal(SIGWINCH, SIG_IGN);
+}
diff --git a/arch/um/os-Linux/registers.c b/arch/um/os-Linux/registers.c
new file mode 100644
index 0000000..2ff8d4f
--- /dev/null
+++ b/arch/um/os-Linux/registers.c
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2004 PathScale, Inc
+ * Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <errno.h>
+#include <string.h>
+#include <sys/ptrace.h>
+#include <sysdep/ptrace.h>
+#include <sysdep/ptrace_user.h>
+#include <registers.h>
+
+int save_registers(int pid, struct uml_pt_regs *regs)
+{
+ int err;
+
+ err = ptrace(PTRACE_GETREGS, pid, 0, regs->gp);
+ if (err < 0)
+ return -errno;
+ return 0;
+}
+
+int restore_registers(int pid, struct uml_pt_regs *regs)
+{
+ int err;
+
+ err = ptrace(PTRACE_SETREGS, pid, 0, regs->gp);
+ if (err < 0)
+ return -errno;
+ return 0;
+}
+
+/* This is set once at boot time and not changed thereafter */
+
+static unsigned long exec_regs[MAX_REG_NR];
+static unsigned long exec_fp_regs[FP_SIZE];
+
+int init_registers(int pid)
+{
+ int err;
+
+ err = ptrace(PTRACE_GETREGS, pid, 0, exec_regs);
+ if (err < 0)
+ return -errno;
+
+ arch_init_registers(pid);
+ get_fp_registers(pid, exec_fp_regs);
+ return 0;
+}
+
+void get_safe_registers(unsigned long *regs, unsigned long *fp_regs)
+{
+ memcpy(regs, exec_regs, sizeof(exec_regs));
+
+ if (fp_regs)
+ memcpy(fp_regs, exec_fp_regs, sizeof(exec_fp_regs));
+}
diff --git a/arch/um/os-Linux/sigio.c b/arch/um/os-Linux/sigio.c
new file mode 100644
index 0000000..46e762f
--- /dev/null
+++ b/arch/um/os-Linux/sigio.c
@@ -0,0 +1,546 @@
+/*
+ * Copyright (C) 2002 - 2008 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <poll.h>
+#include <pty.h>
+#include <sched.h>
+#include <signal.h>
+#include <string.h>
+#include <kern_util.h>
+#include <init.h>
+#include <os.h>
+#include <sigio.h>
+#include <um_malloc.h>
+
+/*
+ * Protected by sigio_lock(), also used by sigio_cleanup, which is an
+ * exitcall.
+ */
+static int write_sigio_pid = -1;
+static unsigned long write_sigio_stack;
+
+/*
+ * These arrays are initialized before the sigio thread is started, and
+ * the descriptors closed after it is killed. So, it can't see them change.
+ * On the UML side, they are changed under the sigio_lock.
+ */
+#define SIGIO_FDS_INIT {-1, -1}
+
+static int write_sigio_fds[2] = SIGIO_FDS_INIT;
+static int sigio_private[2] = SIGIO_FDS_INIT;
+
+struct pollfds {
+ struct pollfd *poll;
+ int size;
+ int used;
+};
+
+/*
+ * Protected by sigio_lock(). Used by the sigio thread, but the UML thread
+ * synchronizes with it.
+ */
+static struct pollfds current_poll;
+static struct pollfds next_poll;
+static struct pollfds all_sigio_fds;
+
+static int write_sigio_thread(void *unused)
+{
+ struct pollfds *fds, tmp;
+ struct pollfd *p;
+ int i, n, respond_fd;
+ char c;
+
+ os_fix_helper_signals();
+ fds = ¤t_poll;
+ while (1) {
+ n = poll(fds->poll, fds->used, -1);
+ if (n < 0) {
+ if (errno == EINTR)
+ continue;
+ printk(UM_KERN_ERR "write_sigio_thread : poll returned "
+ "%d, errno = %d\n", n, errno);
+ }
+ for (i = 0; i < fds->used; i++) {
+ p = &fds->poll[i];
+ if (p->revents == 0)
+ continue;
+ if (p->fd == sigio_private[1]) {
+ CATCH_EINTR(n = read(sigio_private[1], &c,
+ sizeof(c)));
+ if (n != sizeof(c))
+ printk(UM_KERN_ERR
+ "write_sigio_thread : "
+ "read on socket failed, "
+ "err = %d\n", errno);
+ tmp = current_poll;
+ current_poll = next_poll;
+ next_poll = tmp;
+ respond_fd = sigio_private[1];
+ }
+ else {
+ respond_fd = write_sigio_fds[1];
+ fds->used--;
+ memmove(&fds->poll[i], &fds->poll[i + 1],
+ (fds->used - i) * sizeof(*fds->poll));
+ }
+
+ CATCH_EINTR(n = write(respond_fd, &c, sizeof(c)));
+ if (n != sizeof(c))
+ printk(UM_KERN_ERR "write_sigio_thread : "
+ "write on socket failed, err = %d\n",
+ errno);
+ }
+ }
+
+ return 0;
+}
+
+static int need_poll(struct pollfds *polls, int n)
+{
+ struct pollfd *new;
+
+ if (n <= polls->size)
+ return 0;
+
+ new = uml_kmalloc(n * sizeof(struct pollfd), UM_GFP_ATOMIC);
+ if (new == NULL) {
+ printk(UM_KERN_ERR "need_poll : failed to allocate new "
+ "pollfds\n");
+ return -ENOMEM;
+ }
+
+ memcpy(new, polls->poll, polls->used * sizeof(struct pollfd));
+ kfree(polls->poll);
+
+ polls->poll = new;
+ polls->size = n;
+ return 0;
+}
+
+/*
+ * Must be called with sigio_lock held, because it's needed by the marked
+ * critical section.
+ */
+static void update_thread(void)
+{
+ unsigned long flags;
+ int n;
+ char c;
+
+ flags = set_signals(0);
+ CATCH_EINTR(n = write(sigio_private[0], &c, sizeof(c)));
+ if (n != sizeof(c)) {
+ printk(UM_KERN_ERR "update_thread : write failed, err = %d\n",
+ errno);
+ goto fail;
+ }
+
+ CATCH_EINTR(n = read(sigio_private[0], &c, sizeof(c)));
+ if (n != sizeof(c)) {
+ printk(UM_KERN_ERR "update_thread : read failed, err = %d\n",
+ errno);
+ goto fail;
+ }
+
+ set_signals(flags);
+ return;
+ fail:
+ /* Critical section start */
+ if (write_sigio_pid != -1) {
+ os_kill_process(write_sigio_pid, 1);
+ free_stack(write_sigio_stack, 0);
+ }
+ write_sigio_pid = -1;
+ close(sigio_private[0]);
+ close(sigio_private[1]);
+ close(write_sigio_fds[0]);
+ close(write_sigio_fds[1]);
+ /* Critical section end */
+ set_signals(flags);
+}
+
+int add_sigio_fd(int fd)
+{
+ struct pollfd *p;
+ int err = 0, i, n;
+
+ sigio_lock();
+ for (i = 0; i < all_sigio_fds.used; i++) {
+ if (all_sigio_fds.poll[i].fd == fd)
+ break;
+ }
+ if (i == all_sigio_fds.used)
+ goto out;
+
+ p = &all_sigio_fds.poll[i];
+
+ for (i = 0; i < current_poll.used; i++) {
+ if (current_poll.poll[i].fd == fd)
+ goto out;
+ }
+
+ n = current_poll.used;
+ err = need_poll(&next_poll, n + 1);
+ if (err)
+ goto out;
+
+ memcpy(next_poll.poll, current_poll.poll,
+ current_poll.used * sizeof(struct pollfd));
+ next_poll.poll[n] = *p;
+ next_poll.used = n + 1;
+ update_thread();
+ out:
+ sigio_unlock();
+ return err;
+}
+
+int ignore_sigio_fd(int fd)
+{
+ struct pollfd *p;
+ int err = 0, i, n = 0;
+
+ /*
+ * This is called from exitcalls elsewhere in UML - if
+ * sigio_cleanup has already run, then update_thread will hang
+ * or fail because the thread is no longer running.
+ */
+ if (write_sigio_pid == -1)
+ return -EIO;
+
+ sigio_lock();
+ for (i = 0; i < current_poll.used; i++) {
+ if (current_poll.poll[i].fd == fd)
+ break;
+ }
+ if (i == current_poll.used)
+ goto out;
+
+ err = need_poll(&next_poll, current_poll.used - 1);
+ if (err)
+ goto out;
+
+ for (i = 0; i < current_poll.used; i++) {
+ p = ¤t_poll.poll[i];
+ if (p->fd != fd)
+ next_poll.poll[n++] = *p;
+ }
+ next_poll.used = current_poll.used - 1;
+
+ update_thread();
+ out:
+ sigio_unlock();
+ return err;
+}
+
+static struct pollfd *setup_initial_poll(int fd)
+{
+ struct pollfd *p;
+
+ p = uml_kmalloc(sizeof(struct pollfd), UM_GFP_KERNEL);
+ if (p == NULL) {
+ printk(UM_KERN_ERR "setup_initial_poll : failed to allocate "
+ "poll\n");
+ return NULL;
+ }
+ *p = ((struct pollfd) { .fd = fd,
+ .events = POLLIN,
+ .revents = 0 });
+ return p;
+}
+
+static void write_sigio_workaround(void)
+{
+ struct pollfd *p;
+ int err;
+ int l_write_sigio_fds[2];
+ int l_sigio_private[2];
+ int l_write_sigio_pid;
+
+ /* We call this *tons* of times - and most ones we must just fail. */
+ sigio_lock();
+ l_write_sigio_pid = write_sigio_pid;
+ sigio_unlock();
+
+ if (l_write_sigio_pid != -1)
+ return;
+
+ err = os_pipe(l_write_sigio_fds, 1, 1);
+ if (err < 0) {
+ printk(UM_KERN_ERR "write_sigio_workaround - os_pipe 1 failed, "
+ "err = %d\n", -err);
+ return;
+ }
+ err = os_pipe(l_sigio_private, 1, 1);
+ if (err < 0) {
+ printk(UM_KERN_ERR "write_sigio_workaround - os_pipe 2 failed, "
+ "err = %d\n", -err);
+ goto out_close1;
+ }
+
+ p = setup_initial_poll(l_sigio_private[1]);
+ if (!p)
+ goto out_close2;
+
+ sigio_lock();
+
+ /*
+ * Did we race? Don't try to optimize this, please, it's not so likely
+ * to happen, and no more than once at the boot.
+ */
+ if (write_sigio_pid != -1)
+ goto out_free;
+
+ current_poll = ((struct pollfds) { .poll = p,
+ .used = 1,
+ .size = 1 });
+
+ if (write_sigio_irq(l_write_sigio_fds[0]))
+ goto out_clear_poll;
+
+ memcpy(write_sigio_fds, l_write_sigio_fds, sizeof(l_write_sigio_fds));
+ memcpy(sigio_private, l_sigio_private, sizeof(l_sigio_private));
+
+ write_sigio_pid = run_helper_thread(write_sigio_thread, NULL,
+ CLONE_FILES | CLONE_VM,
+ &write_sigio_stack);
+
+ if (write_sigio_pid < 0)
+ goto out_clear;
+
+ sigio_unlock();
+ return;
+
+out_clear:
+ write_sigio_pid = -1;
+ write_sigio_fds[0] = -1;
+ write_sigio_fds[1] = -1;
+ sigio_private[0] = -1;
+ sigio_private[1] = -1;
+out_clear_poll:
+ current_poll = ((struct pollfds) { .poll = NULL,
+ .size = 0,
+ .used = 0 });
+out_free:
+ sigio_unlock();
+ kfree(p);
+out_close2:
+ close(l_sigio_private[0]);
+ close(l_sigio_private[1]);
+out_close1:
+ close(l_write_sigio_fds[0]);
+ close(l_write_sigio_fds[1]);
+}
+
+void sigio_broken(int fd, int read)
+{
+ int err;
+
+ write_sigio_workaround();
+
+ sigio_lock();
+ err = need_poll(&all_sigio_fds, all_sigio_fds.used + 1);
+ if (err) {
+ printk(UM_KERN_ERR "maybe_sigio_broken - failed to add pollfd "
+ "for descriptor %d\n", fd);
+ goto out;
+ }
+
+ all_sigio_fds.poll[all_sigio_fds.used++] =
+ ((struct pollfd) { .fd = fd,
+ .events = read ? POLLIN : POLLOUT,
+ .revents = 0 });
+out:
+ sigio_unlock();
+}
+
+/* Changed during early boot */
+static int pty_output_sigio;
+static int pty_close_sigio;
+
+void maybe_sigio_broken(int fd, int read)
+{
+ if (!isatty(fd))
+ return;
+
+ if ((read || pty_output_sigio) && (!read || pty_close_sigio))
+ return;
+
+ sigio_broken(fd, read);
+}
+
+static void sigio_cleanup(void)
+{
+ if (write_sigio_pid == -1)
+ return;
+
+ os_kill_process(write_sigio_pid, 1);
+ free_stack(write_sigio_stack, 0);
+ write_sigio_pid = -1;
+}
+
+__uml_exitcall(sigio_cleanup);
+
+/* Used as a flag during SIGIO testing early in boot */
+static int got_sigio;
+
+static void __init handler(int sig)
+{
+ got_sigio = 1;
+}
+
+struct openpty_arg {
+ int master;
+ int slave;
+ int err;
+};
+
+static void openpty_cb(void *arg)
+{
+ struct openpty_arg *info = arg;
+
+ info->err = 0;
+ if (openpty(&info->master, &info->slave, NULL, NULL, NULL))
+ info->err = -errno;
+}
+
+static int async_pty(int master, int slave)
+{
+ int flags;
+
+ flags = fcntl(master, F_GETFL);
+ if (flags < 0)
+ return -errno;
+
+ if ((fcntl(master, F_SETFL, flags | O_NONBLOCK | O_ASYNC) < 0) ||
+ (fcntl(master, F_SETOWN, os_getpid()) < 0))
+ return -errno;
+
+ if ((fcntl(slave, F_SETFL, flags | O_NONBLOCK) < 0))
+ return -errno;
+
+ return 0;
+}
+
+static void __init check_one_sigio(void (*proc)(int, int))
+{
+ struct sigaction old, new;
+ struct openpty_arg pty = { .master = -1, .slave = -1 };
+ int master, slave, err;
+
+ initial_thread_cb(openpty_cb, &pty);
+ if (pty.err) {
+ printk(UM_KERN_ERR "check_one_sigio failed, errno = %d\n",
+ -pty.err);
+ return;
+ }
+
+ master = pty.master;
+ slave = pty.slave;
+
+ if ((master == -1) || (slave == -1)) {
+ printk(UM_KERN_ERR "check_one_sigio failed to allocate a "
+ "pty\n");
+ return;
+ }
+
+ /* Not now, but complain so we now where we failed. */
+ err = raw(master);
+ if (err < 0) {
+ printk(UM_KERN_ERR "check_one_sigio : raw failed, errno = %d\n",
+ -err);
+ return;
+ }
+
+ err = async_pty(master, slave);
+ if (err < 0) {
+ printk(UM_KERN_ERR "check_one_sigio : sigio_async failed, "
+ "err = %d\n", -err);
+ return;
+ }
+
+ if (sigaction(SIGIO, NULL, &old) < 0) {
+ printk(UM_KERN_ERR "check_one_sigio : sigaction 1 failed, "
+ "errno = %d\n", errno);
+ return;
+ }
+
+ new = old;
+ new.sa_handler = handler;
+ if (sigaction(SIGIO, &new, NULL) < 0) {
+ printk(UM_KERN_ERR "check_one_sigio : sigaction 2 failed, "
+ "errno = %d\n", errno);
+ return;
+ }
+
+ got_sigio = 0;
+ (*proc)(master, slave);
+
+ close(master);
+ close(slave);
+
+ if (sigaction(SIGIO, &old, NULL) < 0)
+ printk(UM_KERN_ERR "check_one_sigio : sigaction 3 failed, "
+ "errno = %d\n", errno);
+}
+
+static void tty_output(int master, int slave)
+{
+ int n;
+ char buf[512];
+
+ printk(UM_KERN_INFO "Checking that host ptys support output SIGIO...");
+
+ memset(buf, 0, sizeof(buf));
+
+ while (write(master, buf, sizeof(buf)) > 0) ;
+ if (errno != EAGAIN)
+ printk(UM_KERN_ERR "tty_output : write failed, errno = %d\n",
+ errno);
+ while (((n = read(slave, buf, sizeof(buf))) > 0) &&
+ !({ barrier(); got_sigio; }))
+ ;
+
+ if (got_sigio) {
+ printk(UM_KERN_CONT "Yes\n");
+ pty_output_sigio = 1;
+ } else if (n == -EAGAIN)
+ printk(UM_KERN_CONT "No, enabling workaround\n");
+ else
+ printk(UM_KERN_CONT "tty_output : read failed, err = %d\n", n);
+}
+
+static void tty_close(int master, int slave)
+{
+ printk(UM_KERN_INFO "Checking that host ptys support SIGIO on "
+ "close...");
+
+ close(slave);
+ if (got_sigio) {
+ printk(UM_KERN_CONT "Yes\n");
+ pty_close_sigio = 1;
+ } else
+ printk(UM_KERN_CONT "No, enabling workaround\n");
+}
+
+static void __init check_sigio(void)
+{
+ if ((access("/dev/ptmx", R_OK) < 0) &&
+ (access("/dev/ptyp0", R_OK) < 0)) {
+ printk(UM_KERN_WARNING "No pseudo-terminals available - "
+ "skipping pty SIGIO check\n");
+ return;
+ }
+ check_one_sigio(tty_output);
+ check_one_sigio(tty_close);
+}
+
+/* Here because it only does the SIGIO testing for now */
+void __init os_check_bugs(void)
+{
+ check_sigio();
+}
diff --git a/arch/um/os-Linux/signal.c b/arch/um/os-Linux/signal.c
new file mode 100644
index 0000000..c211153
--- /dev/null
+++ b/arch/um/os-Linux/signal.c
@@ -0,0 +1,319 @@
+/*
+ * Copyright (C) 2015 Anton Ivanov (aivanov@{brocade.com,kot-begemot.co.uk})
+ * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
+ * Copyright (C) 2004 PathScale, Inc
+ * Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <stdlib.h>
+#include <stdarg.h>
+#include <errno.h>
+#include <signal.h>
+#include <strings.h>
+#include <as-layout.h>
+#include <kern_util.h>
+#include <os.h>
+#include <sysdep/mcontext.h>
+
+void (*sig_info[NSIG])(int, struct siginfo *, struct uml_pt_regs *) = {
+ [SIGTRAP] = relay_signal,
+ [SIGFPE] = relay_signal,
+ [SIGILL] = relay_signal,
+ [SIGWINCH] = winch,
+ [SIGBUS] = bus_handler,
+ [SIGSEGV] = segv_handler,
+ [SIGIO] = sigio_handler,
+ [SIGALRM] = timer_handler
+};
+
+static void sig_handler_common(int sig, struct siginfo *si, mcontext_t *mc)
+{
+ struct uml_pt_regs r;
+ int save_errno = errno;
+
+ r.is_user = 0;
+ if (sig == SIGSEGV) {
+ /* For segfaults, we want the data from the sigcontext. */
+ get_regs_from_mc(&r, mc);
+ GET_FAULTINFO_FROM_MC(r.faultinfo, mc);
+ }
+
+ /* enable signals if sig isn't IRQ signal */
+ if ((sig != SIGIO) && (sig != SIGWINCH) && (sig != SIGALRM))
+ unblock_signals();
+
+ (*sig_info[sig])(sig, si, &r);
+
+ errno = save_errno;
+}
+
+/*
+ * These are the asynchronous signals. SIGPROF is excluded because we want to
+ * be able to profile all of UML, not just the non-critical sections. If
+ * profiling is not thread-safe, then that is not my problem. We can disable
+ * profiling when SMP is enabled in that case.
+ */
+#define SIGIO_BIT 0
+#define SIGIO_MASK (1 << SIGIO_BIT)
+
+#define SIGALRM_BIT 1
+#define SIGALRM_MASK (1 << SIGALRM_BIT)
+
+static int signals_enabled;
+static unsigned int signals_pending;
+
+void sig_handler(int sig, struct siginfo *si, mcontext_t *mc)
+{
+ int enabled;
+
+ enabled = signals_enabled;
+ if (!enabled && (sig == SIGIO)) {
+ signals_pending |= SIGIO_MASK;
+ return;
+ }
+
+ block_signals();
+
+ sig_handler_common(sig, si, mc);
+
+ set_signals(enabled);
+}
+
+static void timer_real_alarm_handler(mcontext_t *mc)
+{
+ struct uml_pt_regs regs;
+
+ if (mc != NULL)
+ get_regs_from_mc(®s, mc);
+ timer_handler(SIGALRM, NULL, ®s);
+}
+
+void timer_alarm_handler(int sig, struct siginfo *unused_si, mcontext_t *mc)
+{
+ int enabled;
+
+ enabled = signals_enabled;
+ if (!signals_enabled) {
+ signals_pending |= SIGALRM_MASK;
+ return;
+ }
+
+ block_signals();
+
+ timer_real_alarm_handler(mc);
+ set_signals(enabled);
+}
+
+void deliver_alarm(void) {
+ timer_alarm_handler(SIGALRM, NULL, NULL);
+}
+
+void timer_set_signal_handler(void)
+{
+ set_handler(SIGALRM);
+}
+
+void set_sigstack(void *sig_stack, int size)
+{
+ stack_t stack = {
+ .ss_flags = 0,
+ .ss_sp = sig_stack,
+ .ss_size = size - sizeof(void *)
+ };
+
+ if (sigaltstack(&stack, NULL) != 0)
+ panic("enabling signal stack failed, errno = %d\n", errno);
+}
+
+static void (*handlers[_NSIG])(int sig, struct siginfo *si, mcontext_t *mc) = {
+ [SIGSEGV] = sig_handler,
+ [SIGBUS] = sig_handler,
+ [SIGILL] = sig_handler,
+ [SIGFPE] = sig_handler,
+ [SIGTRAP] = sig_handler,
+
+ [SIGIO] = sig_handler,
+ [SIGWINCH] = sig_handler,
+ [SIGALRM] = timer_alarm_handler
+};
+
+static void hard_handler(int sig, siginfo_t *si, void *p)
+{
+ struct ucontext *uc = p;
+ mcontext_t *mc = &uc->uc_mcontext;
+ unsigned long pending = 1UL << sig;
+
+ do {
+ int nested, bail;
+
+ /*
+ * pending comes back with one bit set for each
+ * interrupt that arrived while setting up the stack,
+ * plus a bit for this interrupt, plus the zero bit is
+ * set if this is a nested interrupt.
+ * If bail is true, then we interrupted another
+ * handler setting up the stack. In this case, we
+ * have to return, and the upper handler will deal
+ * with this interrupt.
+ */
+ bail = to_irq_stack(&pending);
+ if (bail)
+ return;
+
+ nested = pending & 1;
+ pending &= ~1;
+
+ while ((sig = ffs(pending)) != 0){
+ sig--;
+ pending &= ~(1 << sig);
+ (*handlers[sig])(sig, (struct siginfo *)si, mc);
+ }
+
+ /*
+ * Again, pending comes back with a mask of signals
+ * that arrived while tearing down the stack. If this
+ * is non-zero, we just go back, set up the stack
+ * again, and handle the new interrupts.
+ */
+ if (!nested)
+ pending = from_irq_stack(nested);
+ } while (pending);
+}
+
+void set_handler(int sig)
+{
+ struct sigaction action;
+ int flags = SA_SIGINFO | SA_ONSTACK;
+ sigset_t sig_mask;
+
+ action.sa_sigaction = hard_handler;
+
+ /* block irq ones */
+ sigemptyset(&action.sa_mask);
+ sigaddset(&action.sa_mask, SIGIO);
+ sigaddset(&action.sa_mask, SIGWINCH);
+ sigaddset(&action.sa_mask, SIGALRM);
+
+ if (sig == SIGSEGV)
+ flags |= SA_NODEFER;
+
+ if (sigismember(&action.sa_mask, sig))
+ flags |= SA_RESTART; /* if it's an irq signal */
+
+ action.sa_flags = flags;
+ action.sa_restorer = NULL;
+ if (sigaction(sig, &action, NULL) < 0)
+ panic("sigaction failed - errno = %d\n", errno);
+
+ sigemptyset(&sig_mask);
+ sigaddset(&sig_mask, sig);
+ if (sigprocmask(SIG_UNBLOCK, &sig_mask, NULL) < 0)
+ panic("sigprocmask failed - errno = %d\n", errno);
+}
+
+int change_sig(int signal, int on)
+{
+ sigset_t sigset;
+
+ sigemptyset(&sigset);
+ sigaddset(&sigset, signal);
+ if (sigprocmask(on ? SIG_UNBLOCK : SIG_BLOCK, &sigset, NULL) < 0)
+ return -errno;
+
+ return 0;
+}
+
+void block_signals(void)
+{
+ signals_enabled = 0;
+ /*
+ * This must return with signals disabled, so this barrier
+ * ensures that writes are flushed out before the return.
+ * This might matter if gcc figures out how to inline this and
+ * decides to shuffle this code into the caller.
+ */
+ barrier();
+}
+
+void unblock_signals(void)
+{
+ int save_pending;
+
+ if (signals_enabled == 1)
+ return;
+
+ /*
+ * We loop because the IRQ handler returns with interrupts off. So,
+ * interrupts may have arrived and we need to re-enable them and
+ * recheck signals_pending.
+ */
+ while (1) {
+ /*
+ * Save and reset save_pending after enabling signals. This
+ * way, signals_pending won't be changed while we're reading it.
+ */
+ signals_enabled = 1;
+
+ /*
+ * Setting signals_enabled and reading signals_pending must
+ * happen in this order.
+ */
+ barrier();
+
+ save_pending = signals_pending;
+ if (save_pending == 0)
+ return;
+
+ signals_pending = 0;
+
+ /*
+ * We have pending interrupts, so disable signals, as the
+ * handlers expect them off when they are called. They will
+ * be enabled again above.
+ */
+
+ signals_enabled = 0;
+
+ /*
+ * Deal with SIGIO first because the alarm handler might
+ * schedule, leaving the pending SIGIO stranded until we come
+ * back here.
+ *
+ * SIGIO's handler doesn't use siginfo or mcontext,
+ * so they can be NULL.
+ */
+ if (save_pending & SIGIO_MASK)
+ sig_handler_common(SIGIO, NULL, NULL);
+
+ if (save_pending & SIGALRM_MASK)
+ timer_real_alarm_handler(NULL);
+ }
+}
+
+int get_signals(void)
+{
+ return signals_enabled;
+}
+
+int set_signals(int enable)
+{
+ int ret;
+ if (signals_enabled == enable)
+ return enable;
+
+ ret = signals_enabled;
+ if (enable)
+ unblock_signals();
+ else block_signals();
+
+ return ret;
+}
+
+int os_is_signal_stack(void)
+{
+ stack_t ss;
+ sigaltstack(NULL, &ss);
+
+ return ss.ss_flags & SS_ONSTACK;
+}
diff --git a/arch/um/os-Linux/skas/Makefile b/arch/um/os-Linux/skas/Makefile
new file mode 100644
index 0000000..d2ea340
--- /dev/null
+++ b/arch/um/os-Linux/skas/Makefile
@@ -0,0 +1,10 @@
+#
+# Copyright (C) 2002 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
+# Licensed under the GPL
+#
+
+obj-y := mem.o process.o
+
+USER_OBJS := $(obj-y)
+
+include arch/um/scripts/Makefile.rules
diff --git a/arch/um/os-Linux/skas/mem.c b/arch/um/os-Linux/skas/mem.c
new file mode 100644
index 0000000..35015e3
--- /dev/null
+++ b/arch/um/os-Linux/skas/mem.c
@@ -0,0 +1,207 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <stddef.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <init.h>
+#include <as-layout.h>
+#include <mm_id.h>
+#include <os.h>
+#include <ptrace_user.h>
+#include <registers.h>
+#include <skas.h>
+#include <sysdep/ptrace.h>
+#include <sysdep/stub.h>
+
+extern char batch_syscall_stub[], __syscall_stub_start[];
+
+extern void wait_stub_done(int pid);
+
+static inline unsigned long *check_init_stack(struct mm_id * mm_idp,
+ unsigned long *stack)
+{
+ if (stack == NULL) {
+ stack = (unsigned long *) mm_idp->stack + 2;
+ *stack = 0;
+ }
+ return stack;
+}
+
+static unsigned long syscall_regs[MAX_REG_NR];
+
+static int __init init_syscall_regs(void)
+{
+ get_safe_registers(syscall_regs, NULL);
+ syscall_regs[REGS_IP_INDEX] = STUB_CODE +
+ ((unsigned long) batch_syscall_stub -
+ (unsigned long) __syscall_stub_start);
+ return 0;
+}
+
+__initcall(init_syscall_regs);
+
+static inline long do_syscall_stub(struct mm_id * mm_idp, void **addr)
+{
+ int n, i;
+ long ret, offset;
+ unsigned long * data;
+ unsigned long * syscall;
+ int err, pid = mm_idp->u.pid;
+
+ n = ptrace_setregs(pid, syscall_regs);
+ if (n < 0) {
+ printk(UM_KERN_ERR "Registers - \n");
+ for (i = 0; i < MAX_REG_NR; i++)
+ printk(UM_KERN_ERR "\t%d\t0x%lx\n", i, syscall_regs[i]);
+ panic("do_syscall_stub : PTRACE_SETREGS failed, errno = %d\n",
+ -n);
+ }
+
+ err = ptrace(PTRACE_CONT, pid, 0, 0);
+ if (err)
+ panic("Failed to continue stub, pid = %d, errno = %d\n", pid,
+ errno);
+
+ wait_stub_done(pid);
+
+ /*
+ * When the stub stops, we find the following values on the
+ * beginning of the stack:
+ * (long )return_value
+ * (long )offset to failed sycall-data (0, if no error)
+ */
+ ret = *((unsigned long *) mm_idp->stack);
+ offset = *((unsigned long *) mm_idp->stack + 1);
+ if (offset) {
+ data = (unsigned long *)(mm_idp->stack + offset - STUB_DATA);
+ printk(UM_KERN_ERR "do_syscall_stub : ret = %ld, offset = %ld, "
+ "data = %p\n", ret, offset, data);
+ syscall = (unsigned long *)((unsigned long)data + data[0]);
+ printk(UM_KERN_ERR "do_syscall_stub: syscall %ld failed, "
+ "return value = 0x%lx, expected return value = 0x%lx\n",
+ syscall[0], ret, syscall[7]);
+ printk(UM_KERN_ERR " syscall parameters: "
+ "0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
+ syscall[1], syscall[2], syscall[3],
+ syscall[4], syscall[5], syscall[6]);
+ for (n = 1; n < data[0]/sizeof(long); n++) {
+ if (n == 1)
+ printk(UM_KERN_ERR " additional syscall "
+ "data:");
+ if (n % 4 == 1)
+ printk("\n" UM_KERN_ERR " ");
+ printk(" 0x%lx", data[n]);
+ }
+ if (n > 1)
+ printk("\n");
+ }
+ else ret = 0;
+
+ *addr = check_init_stack(mm_idp, NULL);
+
+ return ret;
+}
+
+long run_syscall_stub(struct mm_id * mm_idp, int syscall,
+ unsigned long *args, long expected, void **addr,
+ int done)
+{
+ unsigned long *stack = check_init_stack(mm_idp, *addr);
+
+ *stack += sizeof(long);
+ stack += *stack / sizeof(long);
+
+ *stack++ = syscall;
+ *stack++ = args[0];
+ *stack++ = args[1];
+ *stack++ = args[2];
+ *stack++ = args[3];
+ *stack++ = args[4];
+ *stack++ = args[5];
+ *stack++ = expected;
+ *stack = 0;
+
+ if (!done && ((((unsigned long) stack) & ~UM_KERN_PAGE_MASK) <
+ UM_KERN_PAGE_SIZE - 10 * sizeof(long))) {
+ *addr = stack;
+ return 0;
+ }
+
+ return do_syscall_stub(mm_idp, addr);
+}
+
+long syscall_stub_data(struct mm_id * mm_idp,
+ unsigned long *data, int data_count,
+ void **addr, void **stub_addr)
+{
+ unsigned long *stack;
+ int ret = 0;
+
+ /*
+ * If *addr still is uninitialized, it *must* contain NULL.
+ * Thus in this case do_syscall_stub correctly won't be called.
+ */
+ if ((((unsigned long) *addr) & ~UM_KERN_PAGE_MASK) >=
+ UM_KERN_PAGE_SIZE - (10 + data_count) * sizeof(long)) {
+ ret = do_syscall_stub(mm_idp, addr);
+ /* in case of error, don't overwrite data on stack */
+ if (ret)
+ return ret;
+ }
+
+ stack = check_init_stack(mm_idp, *addr);
+ *addr = stack;
+
+ *stack = data_count * sizeof(long);
+
+ memcpy(stack + 1, data, data_count * sizeof(long));
+
+ *stub_addr = (void *)(((unsigned long)(stack + 1) &
+ ~UM_KERN_PAGE_MASK) + STUB_DATA);
+
+ return 0;
+}
+
+int map(struct mm_id * mm_idp, unsigned long virt, unsigned long len, int prot,
+ int phys_fd, unsigned long long offset, int done, void **data)
+{
+ int ret;
+ unsigned long args[] = { virt, len, prot,
+ MAP_SHARED | MAP_FIXED, phys_fd,
+ MMAP_OFFSET(offset) };
+
+ ret = run_syscall_stub(mm_idp, STUB_MMAP_NR, args, virt,
+ data, done);
+
+ return ret;
+}
+
+int unmap(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
+ int done, void **data)
+{
+ int ret;
+ unsigned long args[] = { (unsigned long) addr, len, 0, 0, 0,
+ 0 };
+
+ ret = run_syscall_stub(mm_idp, __NR_munmap, args, 0,
+ data, done);
+
+ return ret;
+}
+
+int protect(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
+ unsigned int prot, int done, void **data)
+{
+ int ret;
+ unsigned long args[] = { addr, len, prot, 0, 0, 0 };
+
+ ret = run_syscall_stub(mm_idp, __NR_mprotect, args, 0,
+ data, done);
+
+ return ret;
+}
diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c
new file mode 100644
index 0000000..b856c66
--- /dev/null
+++ b/arch/um/os-Linux/skas/process.c
@@ -0,0 +1,623 @@
+/*
+ * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
+ * Copyright (C) 2002- 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <sched.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/wait.h>
+#include <asm/unistd.h>
+#include <as-layout.h>
+#include <init.h>
+#include <kern_util.h>
+#include <mem.h>
+#include <os.h>
+#include <ptrace_user.h>
+#include <registers.h>
+#include <skas.h>
+#include <sysdep/stub.h>
+
+int is_skas_winch(int pid, int fd, void *data)
+{
+ return pid == getpgrp();
+}
+
+static int ptrace_dump_regs(int pid)
+{
+ unsigned long regs[MAX_REG_NR];
+ int i;
+
+ if (ptrace(PTRACE_GETREGS, pid, 0, regs) < 0)
+ return -errno;
+
+ printk(UM_KERN_ERR "Stub registers -\n");
+ for (i = 0; i < ARRAY_SIZE(regs); i++)
+ printk(UM_KERN_ERR "\t%d - %lx\n", i, regs[i]);
+
+ return 0;
+}
+
+/*
+ * Signals that are OK to receive in the stub - we'll just continue it.
+ * SIGWINCH will happen when UML is inside a detached screen.
+ */
+#define STUB_SIG_MASK ((1 << SIGALRM) | (1 << SIGWINCH))
+
+/* Signals that the stub will finish with - anything else is an error */
+#define STUB_DONE_MASK (1 << SIGTRAP)
+
+void wait_stub_done(int pid)
+{
+ int n, status, err;
+
+ while (1) {
+ CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED | __WALL));
+ if ((n < 0) || !WIFSTOPPED(status))
+ goto bad_wait;
+
+ if (((1 << WSTOPSIG(status)) & STUB_SIG_MASK) == 0)
+ break;
+
+ err = ptrace(PTRACE_CONT, pid, 0, 0);
+ if (err) {
+ printk(UM_KERN_ERR "wait_stub_done : continue failed, "
+ "errno = %d\n", errno);
+ fatal_sigsegv();
+ }
+ }
+
+ if (((1 << WSTOPSIG(status)) & STUB_DONE_MASK) != 0)
+ return;
+
+bad_wait:
+ err = ptrace_dump_regs(pid);
+ if (err)
+ printk(UM_KERN_ERR "Failed to get registers from stub, "
+ "errno = %d\n", -err);
+ printk(UM_KERN_ERR "wait_stub_done : failed to wait for SIGTRAP, "
+ "pid = %d, n = %d, errno = %d, status = 0x%x\n", pid, n, errno,
+ status);
+ fatal_sigsegv();
+}
+
+extern unsigned long current_stub_stack(void);
+
+static void get_skas_faultinfo(int pid, struct faultinfo *fi)
+{
+ int err;
+ unsigned long fpregs[FP_SIZE];
+
+ err = get_fp_registers(pid, fpregs);
+ if (err < 0) {
+ printk(UM_KERN_ERR "save_fp_registers returned %d\n",
+ err);
+ fatal_sigsegv();
+ }
+ err = ptrace(PTRACE_CONT, pid, 0, SIGSEGV);
+ if (err) {
+ printk(UM_KERN_ERR "Failed to continue stub, pid = %d, "
+ "errno = %d\n", pid, errno);
+ fatal_sigsegv();
+ }
+ wait_stub_done(pid);
+
+ /*
+ * faultinfo is prepared by the stub-segv-handler at start of
+ * the stub stack page. We just have to copy it.
+ */
+ memcpy(fi, (void *)current_stub_stack(), sizeof(*fi));
+
+ err = put_fp_registers(pid, fpregs);
+ if (err < 0) {
+ printk(UM_KERN_ERR "put_fp_registers returned %d\n",
+ err);
+ fatal_sigsegv();
+ }
+}
+
+static void handle_segv(int pid, struct uml_pt_regs * regs)
+{
+ get_skas_faultinfo(pid, ®s->faultinfo);
+ segv(regs->faultinfo, 0, 1, NULL);
+}
+
+/*
+ * To use the same value of using_sysemu as the caller, ask it that value
+ * (in local_using_sysemu
+ */
+static void handle_trap(int pid, struct uml_pt_regs *regs,
+ int local_using_sysemu)
+{
+ int err, status;
+
+ if ((UPT_IP(regs) >= STUB_START) && (UPT_IP(regs) < STUB_END))
+ fatal_sigsegv();
+
+ if (!local_using_sysemu)
+ {
+ err = ptrace(PTRACE_POKEUSER, pid, PT_SYSCALL_NR_OFFSET,
+ __NR_getpid);
+ if (err < 0) {
+ printk(UM_KERN_ERR "handle_trap - nullifying syscall "
+ "failed, errno = %d\n", errno);
+ fatal_sigsegv();
+ }
+
+ err = ptrace(PTRACE_SYSCALL, pid, 0, 0);
+ if (err < 0) {
+ printk(UM_KERN_ERR "handle_trap - continuing to end of "
+ "syscall failed, errno = %d\n", errno);
+ fatal_sigsegv();
+ }
+
+ CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED | __WALL));
+ if ((err < 0) || !WIFSTOPPED(status) ||
+ (WSTOPSIG(status) != SIGTRAP + 0x80)) {
+ err = ptrace_dump_regs(pid);
+ if (err)
+ printk(UM_KERN_ERR "Failed to get registers "
+ "from process, errno = %d\n", -err);
+ printk(UM_KERN_ERR "handle_trap - failed to wait at "
+ "end of syscall, errno = %d, status = %d\n",
+ errno, status);
+ fatal_sigsegv();
+ }
+ }
+
+ handle_syscall(regs);
+}
+
+int get_syscall(struct uml_pt_regs *regs)
+{
+ UPT_SYSCALL_NR(regs) = PT_SYSCALL_NR(regs->gp);
+
+ return UPT_SYSCALL_NR(regs);
+}
+
+extern char __syscall_stub_start[];
+
+static int userspace_tramp(void *stack)
+{
+ void *addr;
+ int fd;
+ unsigned long long offset;
+
+ ptrace(PTRACE_TRACEME, 0, 0, 0);
+
+ signal(SIGTERM, SIG_DFL);
+ signal(SIGWINCH, SIG_IGN);
+
+ /*
+ * This has a pte, but it can't be mapped in with the usual
+ * tlb_flush mechanism because this is part of that mechanism
+ */
+ fd = phys_mapping(to_phys(__syscall_stub_start), &offset);
+ addr = mmap64((void *) STUB_CODE, UM_KERN_PAGE_SIZE,
+ PROT_EXEC, MAP_FIXED | MAP_PRIVATE, fd, offset);
+ if (addr == MAP_FAILED) {
+ printk(UM_KERN_ERR "mapping mmap stub at 0x%lx failed, "
+ "errno = %d\n", STUB_CODE, errno);
+ exit(1);
+ }
+
+ if (stack != NULL) {
+ fd = phys_mapping(to_phys(stack), &offset);
+ addr = mmap((void *) STUB_DATA,
+ UM_KERN_PAGE_SIZE, PROT_READ | PROT_WRITE,
+ MAP_FIXED | MAP_SHARED, fd, offset);
+ if (addr == MAP_FAILED) {
+ printk(UM_KERN_ERR "mapping segfault stack "
+ "at 0x%lx failed, errno = %d\n",
+ STUB_DATA, errno);
+ exit(1);
+ }
+ }
+ if (stack != NULL) {
+ struct sigaction sa;
+
+ unsigned long v = STUB_CODE +
+ (unsigned long) stub_segv_handler -
+ (unsigned long) __syscall_stub_start;
+
+ set_sigstack((void *) STUB_DATA, UM_KERN_PAGE_SIZE);
+ sigemptyset(&sa.sa_mask);
+ sa.sa_flags = SA_ONSTACK | SA_NODEFER | SA_SIGINFO;
+ sa.sa_sigaction = (void *) v;
+ sa.sa_restorer = NULL;
+ if (sigaction(SIGSEGV, &sa, NULL) < 0) {
+ printk(UM_KERN_ERR "userspace_tramp - setting SIGSEGV "
+ "handler failed - errno = %d\n", errno);
+ exit(1);
+ }
+ }
+
+ kill(os_getpid(), SIGSTOP);
+ return 0;
+}
+
+/* Each element set once, and only accessed by a single processor anyway */
+#undef NR_CPUS
+#define NR_CPUS 1
+int userspace_pid[NR_CPUS];
+
+int start_userspace(unsigned long stub_stack)
+{
+ void *stack;
+ unsigned long sp;
+ int pid, status, n, flags, err;
+
+ stack = mmap(NULL, UM_KERN_PAGE_SIZE,
+ PROT_READ | PROT_WRITE | PROT_EXEC,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ if (stack == MAP_FAILED) {
+ err = -errno;
+ printk(UM_KERN_ERR "start_userspace : mmap failed, "
+ "errno = %d\n", errno);
+ return err;
+ }
+
+ sp = (unsigned long) stack + UM_KERN_PAGE_SIZE - sizeof(void *);
+
+ flags = CLONE_FILES | SIGCHLD;
+
+ pid = clone(userspace_tramp, (void *) sp, flags, (void *) stub_stack);
+ if (pid < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "start_userspace : clone failed, "
+ "errno = %d\n", errno);
+ return err;
+ }
+
+ do {
+ CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED | __WALL));
+ if (n < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "start_userspace : wait failed, "
+ "errno = %d\n", errno);
+ goto out_kill;
+ }
+ } while (WIFSTOPPED(status) && (WSTOPSIG(status) == SIGALRM));
+
+ if (!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGSTOP)) {
+ err = -EINVAL;
+ printk(UM_KERN_ERR "start_userspace : expected SIGSTOP, got "
+ "status = %d\n", status);
+ goto out_kill;
+ }
+
+ if (ptrace(PTRACE_OLDSETOPTIONS, pid, NULL,
+ (void *) PTRACE_O_TRACESYSGOOD) < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "start_userspace : PTRACE_OLDSETOPTIONS "
+ "failed, errno = %d\n", errno);
+ goto out_kill;
+ }
+
+ if (munmap(stack, UM_KERN_PAGE_SIZE) < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "start_userspace : munmap failed, "
+ "errno = %d\n", errno);
+ goto out_kill;
+ }
+
+ return pid;
+
+ out_kill:
+ os_kill_ptraced_process(pid, 1);
+ return err;
+}
+
+void userspace(struct uml_pt_regs *regs)
+{
+ int err, status, op, pid = userspace_pid[0];
+ /* To prevent races if using_sysemu changes under us.*/
+ int local_using_sysemu;
+ siginfo_t si;
+
+ /* Handle any immediate reschedules or signals */
+ interrupt_end();
+
+ while (1) {
+
+ /*
+ * This can legitimately fail if the process loads a
+ * bogus value into a segment register. It will
+ * segfault and PTRACE_GETREGS will read that value
+ * out of the process. However, PTRACE_SETREGS will
+ * fail. In this case, there is nothing to do but
+ * just kill the process.
+ */
+ if (ptrace(PTRACE_SETREGS, pid, 0, regs->gp))
+ fatal_sigsegv();
+
+ if (put_fp_registers(pid, regs->fp))
+ fatal_sigsegv();
+
+ /* Now we set local_using_sysemu to be used for one loop */
+ local_using_sysemu = get_using_sysemu();
+
+ op = SELECT_PTRACE_OPERATION(local_using_sysemu,
+ singlestepping(NULL));
+
+ if (ptrace(op, pid, 0, 0)) {
+ printk(UM_KERN_ERR "userspace - ptrace continue "
+ "failed, op = %d, errno = %d\n", op, errno);
+ fatal_sigsegv();
+ }
+
+ CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED | __WALL));
+ if (err < 0) {
+ printk(UM_KERN_ERR "userspace - wait failed, "
+ "errno = %d\n", errno);
+ fatal_sigsegv();
+ }
+
+ regs->is_user = 1;
+ if (ptrace(PTRACE_GETREGS, pid, 0, regs->gp)) {
+ printk(UM_KERN_ERR "userspace - PTRACE_GETREGS failed, "
+ "errno = %d\n", errno);
+ fatal_sigsegv();
+ }
+
+ if (get_fp_registers(pid, regs->fp)) {
+ printk(UM_KERN_ERR "userspace - get_fp_registers failed, "
+ "errno = %d\n", errno);
+ fatal_sigsegv();
+ }
+
+ UPT_SYSCALL_NR(regs) = -1; /* Assume: It's not a syscall */
+
+ if (WIFSTOPPED(status)) {
+ int sig = WSTOPSIG(status);
+
+ ptrace(PTRACE_GETSIGINFO, pid, 0, (struct siginfo *)&si);
+
+ switch (sig) {
+ case SIGSEGV:
+ if (PTRACE_FULL_FAULTINFO) {
+ get_skas_faultinfo(pid,
+ ®s->faultinfo);
+ (*sig_info[SIGSEGV])(SIGSEGV, (struct siginfo *)&si,
+ regs);
+ }
+ else handle_segv(pid, regs);
+ break;
+ case SIGTRAP + 0x80:
+ handle_trap(pid, regs, local_using_sysemu);
+ break;
+ case SIGTRAP:
+ relay_signal(SIGTRAP, (struct siginfo *)&si, regs);
+ break;
+ case SIGALRM:
+ break;
+ case SIGIO:
+ case SIGILL:
+ case SIGBUS:
+ case SIGFPE:
+ case SIGWINCH:
+ block_signals();
+ (*sig_info[sig])(sig, (struct siginfo *)&si, regs);
+ unblock_signals();
+ break;
+ default:
+ printk(UM_KERN_ERR "userspace - child stopped "
+ "with signal %d\n", sig);
+ fatal_sigsegv();
+ }
+ pid = userspace_pid[0];
+ interrupt_end();
+
+ /* Avoid -ERESTARTSYS handling in host */
+ if (PT_SYSCALL_NR_OFFSET != PT_SYSCALL_RET_OFFSET)
+ PT_SYSCALL_NR(regs->gp) = -1;
+ }
+ }
+}
+
+static unsigned long thread_regs[MAX_REG_NR];
+static unsigned long thread_fp_regs[FP_SIZE];
+
+static int __init init_thread_regs(void)
+{
+ get_safe_registers(thread_regs, thread_fp_regs);
+ /* Set parent's instruction pointer to start of clone-stub */
+ thread_regs[REGS_IP_INDEX] = STUB_CODE +
+ (unsigned long) stub_clone_handler -
+ (unsigned long) __syscall_stub_start;
+ thread_regs[REGS_SP_INDEX] = STUB_DATA + UM_KERN_PAGE_SIZE -
+ sizeof(void *);
+#ifdef __SIGNAL_FRAMESIZE
+ thread_regs[REGS_SP_INDEX] -= __SIGNAL_FRAMESIZE;
+#endif
+ return 0;
+}
+
+__initcall(init_thread_regs);
+
+int copy_context_skas0(unsigned long new_stack, int pid)
+{
+ int err;
+ unsigned long current_stack = current_stub_stack();
+ struct stub_data *data = (struct stub_data *) current_stack;
+ struct stub_data *child_data = (struct stub_data *) new_stack;
+ unsigned long long new_offset;
+ int new_fd = phys_mapping(to_phys((void *)new_stack), &new_offset);
+
+ /*
+ * prepare offset and fd of child's stack as argument for parent's
+ * and child's mmap2 calls
+ */
+ *data = ((struct stub_data) {
+ .offset = MMAP_OFFSET(new_offset),
+ .fd = new_fd
+ });
+
+ err = ptrace_setregs(pid, thread_regs);
+ if (err < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "copy_context_skas0 : PTRACE_SETREGS "
+ "failed, pid = %d, errno = %d\n", pid, -err);
+ return err;
+ }
+
+ err = put_fp_registers(pid, thread_fp_regs);
+ if (err < 0) {
+ printk(UM_KERN_ERR "copy_context_skas0 : put_fp_registers "
+ "failed, pid = %d, err = %d\n", pid, err);
+ return err;
+ }
+
+ /* set a well known return code for detection of child write failure */
+ child_data->err = 12345678;
+
+ /*
+ * Wait, until parent has finished its work: read child's pid from
+ * parent's stack, and check, if bad result.
+ */
+ err = ptrace(PTRACE_CONT, pid, 0, 0);
+ if (err) {
+ err = -errno;
+ printk(UM_KERN_ERR "Failed to continue new process, pid = %d, "
+ "errno = %d\n", pid, errno);
+ return err;
+ }
+
+ wait_stub_done(pid);
+
+ pid = data->err;
+ if (pid < 0) {
+ printk(UM_KERN_ERR "copy_context_skas0 - stub-parent reports "
+ "error %d\n", -pid);
+ return pid;
+ }
+
+ /*
+ * Wait, until child has finished too: read child's result from
+ * child's stack and check it.
+ */
+ wait_stub_done(pid);
+ if (child_data->err != STUB_DATA) {
+ printk(UM_KERN_ERR "copy_context_skas0 - stub-child reports "
+ "error %ld\n", child_data->err);
+ err = child_data->err;
+ goto out_kill;
+ }
+
+ if (ptrace(PTRACE_OLDSETOPTIONS, pid, NULL,
+ (void *)PTRACE_O_TRACESYSGOOD) < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "copy_context_skas0 : PTRACE_OLDSETOPTIONS "
+ "failed, errno = %d\n", errno);
+ goto out_kill;
+ }
+
+ return pid;
+
+ out_kill:
+ os_kill_ptraced_process(pid, 1);
+ return err;
+}
+
+void new_thread(void *stack, jmp_buf *buf, void (*handler)(void))
+{
+ (*buf)[0].JB_IP = (unsigned long) handler;
+ (*buf)[0].JB_SP = (unsigned long) stack + UM_THREAD_SIZE -
+ sizeof(void *);
+}
+
+#define INIT_JMP_NEW_THREAD 0
+#define INIT_JMP_CALLBACK 1
+#define INIT_JMP_HALT 2
+#define INIT_JMP_REBOOT 3
+
+void switch_threads(jmp_buf *me, jmp_buf *you)
+{
+ if (UML_SETJMP(me) == 0)
+ UML_LONGJMP(you, 1);
+}
+
+static jmp_buf initial_jmpbuf;
+
+/* XXX Make these percpu */
+static void (*cb_proc)(void *arg);
+static void *cb_arg;
+static jmp_buf *cb_back;
+
+int start_idle_thread(void *stack, jmp_buf *switch_buf)
+{
+ int n;
+
+ set_handler(SIGWINCH);
+
+ /*
+ * Can't use UML_SETJMP or UML_LONGJMP here because they save
+ * and restore signals, with the possible side-effect of
+ * trying to handle any signals which came when they were
+ * blocked, which can't be done on this stack.
+ * Signals must be blocked when jumping back here and restored
+ * after returning to the jumper.
+ */
+ n = setjmp(initial_jmpbuf);
+ switch (n) {
+ case INIT_JMP_NEW_THREAD:
+ (*switch_buf)[0].JB_IP = (unsigned long) uml_finishsetup;
+ (*switch_buf)[0].JB_SP = (unsigned long) stack +
+ UM_THREAD_SIZE - sizeof(void *);
+ break;
+ case INIT_JMP_CALLBACK:
+ (*cb_proc)(cb_arg);
+ longjmp(*cb_back, 1);
+ break;
+ case INIT_JMP_HALT:
+ kmalloc_ok = 0;
+ return 0;
+ case INIT_JMP_REBOOT:
+ kmalloc_ok = 0;
+ return 1;
+ default:
+ printk(UM_KERN_ERR "Bad sigsetjmp return in "
+ "start_idle_thread - %d\n", n);
+ fatal_sigsegv();
+ }
+ longjmp(*switch_buf, 1);
+}
+
+void initial_thread_cb_skas(void (*proc)(void *), void *arg)
+{
+ jmp_buf here;
+
+ cb_proc = proc;
+ cb_arg = arg;
+ cb_back = &here;
+
+ block_signals();
+ if (UML_SETJMP(&here) == 0)
+ UML_LONGJMP(&initial_jmpbuf, INIT_JMP_CALLBACK);
+ unblock_signals();
+
+ cb_proc = NULL;
+ cb_arg = NULL;
+ cb_back = NULL;
+}
+
+void halt_skas(void)
+{
+ block_signals();
+ UML_LONGJMP(&initial_jmpbuf, INIT_JMP_HALT);
+}
+
+void reboot_skas(void)
+{
+ block_signals();
+ UML_LONGJMP(&initial_jmpbuf, INIT_JMP_REBOOT);
+}
+
+void __switch_mm(struct mm_id *mm_idp)
+{
+ userspace_pid[0] = mm_idp->u.pid;
+}
diff --git a/arch/um/os-Linux/start_up.c b/arch/um/os-Linux/start_up.c
new file mode 100644
index 0000000..22a358e
--- /dev/null
+++ b/arch/um/os-Linux/start_up.c
@@ -0,0 +1,390 @@
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sched.h>
+#include <signal.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <asm/unistd.h>
+#include <init.h>
+#include <os.h>
+#include <mem_user.h>
+#include <ptrace_user.h>
+#include <registers.h>
+#include <skas.h>
+
+static void ptrace_child(void)
+{
+ int ret;
+ /* Calling os_getpid because some libcs cached getpid incorrectly */
+ int pid = os_getpid(), ppid = getppid();
+ int sc_result;
+
+ if (change_sig(SIGWINCH, 0) < 0 ||
+ ptrace(PTRACE_TRACEME, 0, 0, 0) < 0) {
+ perror("ptrace");
+ kill(pid, SIGKILL);
+ }
+ kill(pid, SIGSTOP);
+
+ /*
+ * This syscall will be intercepted by the parent. Don't call more than
+ * once, please.
+ */
+ sc_result = os_getpid();
+
+ if (sc_result == pid)
+ /* Nothing modified by the parent, we are running normally. */
+ ret = 1;
+ else if (sc_result == ppid)
+ /*
+ * Expected in check_ptrace and check_sysemu when they succeed
+ * in modifying the stack frame
+ */
+ ret = 0;
+ else
+ /* Serious trouble! This could be caused by a bug in host 2.6
+ * SKAS3/2.6 patch before release -V6, together with a bug in
+ * the UML code itself.
+ */
+ ret = 2;
+
+ exit(ret);
+}
+
+static void fatal_perror(const char *str)
+{
+ perror(str);
+ exit(1);
+}
+
+static void fatal(char *fmt, ...)
+{
+ va_list list;
+
+ va_start(list, fmt);
+ vfprintf(stderr, fmt, list);
+ va_end(list);
+
+ exit(1);
+}
+
+static void non_fatal(char *fmt, ...)
+{
+ va_list list;
+
+ va_start(list, fmt);
+ vfprintf(stderr, fmt, list);
+ va_end(list);
+}
+
+static int start_ptraced_child(void)
+{
+ int pid, n, status;
+
+ fflush(stdout);
+
+ pid = fork();
+ if (pid == 0)
+ ptrace_child();
+ else if (pid < 0)
+ fatal_perror("start_ptraced_child : fork failed");
+
+ CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
+ if (n < 0)
+ fatal_perror("check_ptrace : waitpid failed");
+ if (!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGSTOP))
+ fatal("check_ptrace : expected SIGSTOP, got status = %d",
+ status);
+
+ return pid;
+}
+
+/* When testing for SYSEMU support, if it is one of the broken versions, we
+ * must just avoid using sysemu, not panic, but only if SYSEMU features are
+ * broken.
+ * So only for SYSEMU features we test mustpanic, while normal host features
+ * must work anyway!
+ */
+static int stop_ptraced_child(int pid, int exitcode, int mustexit)
+{
+ int status, n, ret = 0;
+
+ if (ptrace(PTRACE_CONT, pid, 0, 0) < 0) {
+ perror("stop_ptraced_child : ptrace failed");
+ return -1;
+ }
+ CATCH_EINTR(n = waitpid(pid, &status, 0));
+ if (!WIFEXITED(status) || (WEXITSTATUS(status) != exitcode)) {
+ int exit_with = WEXITSTATUS(status);
+ if (exit_with == 2)
+ non_fatal("check_ptrace : child exited with status 2. "
+ "\nDisabling SYSEMU support.\n");
+ non_fatal("check_ptrace : child exited with exitcode %d, while "
+ "expecting %d; status 0x%x\n", exit_with,
+ exitcode, status);
+ if (mustexit)
+ exit(1);
+ ret = -1;
+ }
+
+ return ret;
+}
+
+/* Changed only during early boot */
+static int force_sysemu_disabled = 0;
+
+static int __init nosysemu_cmd_param(char *str, int* add)
+{
+ force_sysemu_disabled = 1;
+ return 0;
+}
+
+__uml_setup("nosysemu", nosysemu_cmd_param,
+"nosysemu\n"
+" Turns off syscall emulation patch for ptrace (SYSEMU) on.\n"
+" SYSEMU is a performance-patch introduced by Laurent Vivier. It changes\n"
+" behaviour of ptrace() and helps reducing host context switch rate.\n"
+" To make it working, you need a kernel patch for your host, too.\n"
+" See http://perso.wanadoo.fr/laurent.vivier/UML/ for further \n"
+" information.\n\n");
+
+static void __init check_sysemu(void)
+{
+ unsigned long regs[MAX_REG_NR];
+ int pid, n, status, count=0;
+
+ non_fatal("Checking syscall emulation patch for ptrace...");
+ sysemu_supported = 0;
+ pid = start_ptraced_child();
+
+ if (ptrace(PTRACE_SYSEMU, pid, 0, 0) < 0)
+ goto fail;
+
+ CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
+ if (n < 0)
+ fatal_perror("check_sysemu : wait failed");
+ if (!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGTRAP))
+ fatal("check_sysemu : expected SIGTRAP, got status = %d\n",
+ status);
+
+ if (ptrace(PTRACE_GETREGS, pid, 0, regs) < 0)
+ fatal_perror("check_sysemu : PTRACE_GETREGS failed");
+ if (PT_SYSCALL_NR(regs) != __NR_getpid) {
+ non_fatal("check_sysemu got system call number %d, "
+ "expected %d...", PT_SYSCALL_NR(regs), __NR_getpid);
+ goto fail;
+ }
+
+ n = ptrace(PTRACE_POKEUSER, pid, PT_SYSCALL_RET_OFFSET, os_getpid());
+ if (n < 0) {
+ non_fatal("check_sysemu : failed to modify system call "
+ "return");
+ goto fail;
+ }
+
+ if (stop_ptraced_child(pid, 0, 0) < 0)
+ goto fail_stopped;
+
+ sysemu_supported = 1;
+ non_fatal("OK\n");
+ set_using_sysemu(!force_sysemu_disabled);
+
+ non_fatal("Checking advanced syscall emulation patch for ptrace...");
+ pid = start_ptraced_child();
+
+ if ((ptrace(PTRACE_OLDSETOPTIONS, pid, 0,
+ (void *) PTRACE_O_TRACESYSGOOD) < 0))
+ fatal_perror("check_sysemu: PTRACE_OLDSETOPTIONS failed");
+
+ while (1) {
+ count++;
+ if (ptrace(PTRACE_SYSEMU_SINGLESTEP, pid, 0, 0) < 0)
+ goto fail;
+ CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
+ if (n < 0)
+ fatal_perror("check_sysemu: wait failed");
+
+ if (WIFSTOPPED(status) &&
+ (WSTOPSIG(status) == (SIGTRAP|0x80))) {
+ if (!count) {
+ non_fatal("check_sysemu: SYSEMU_SINGLESTEP "
+ "doesn't singlestep");
+ goto fail;
+ }
+ n = ptrace(PTRACE_POKEUSER, pid, PT_SYSCALL_RET_OFFSET,
+ os_getpid());
+ if (n < 0)
+ fatal_perror("check_sysemu : failed to modify "
+ "system call return");
+ break;
+ }
+ else if (WIFSTOPPED(status) && (WSTOPSIG(status) == SIGTRAP))
+ count++;
+ else {
+ non_fatal("check_sysemu: expected SIGTRAP or "
+ "(SIGTRAP | 0x80), got status = %d\n",
+ status);
+ goto fail;
+ }
+ }
+ if (stop_ptraced_child(pid, 0, 0) < 0)
+ goto fail_stopped;
+
+ sysemu_supported = 2;
+ non_fatal("OK\n");
+
+ if (!force_sysemu_disabled)
+ set_using_sysemu(sysemu_supported);
+ return;
+
+fail:
+ stop_ptraced_child(pid, 1, 0);
+fail_stopped:
+ non_fatal("missing\n");
+}
+
+static void __init check_ptrace(void)
+{
+ int pid, syscall, n, status;
+
+ non_fatal("Checking that ptrace can change system call numbers...");
+ pid = start_ptraced_child();
+
+ if ((ptrace(PTRACE_OLDSETOPTIONS, pid, 0,
+ (void *) PTRACE_O_TRACESYSGOOD) < 0))
+ fatal_perror("check_ptrace: PTRACE_OLDSETOPTIONS failed");
+
+ while (1) {
+ if (ptrace(PTRACE_SYSCALL, pid, 0, 0) < 0)
+ fatal_perror("check_ptrace : ptrace failed");
+
+ CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
+ if (n < 0)
+ fatal_perror("check_ptrace : wait failed");
+
+ if (!WIFSTOPPED(status) ||
+ (WSTOPSIG(status) != (SIGTRAP | 0x80)))
+ fatal("check_ptrace : expected (SIGTRAP|0x80), "
+ "got status = %d", status);
+
+ syscall = ptrace(PTRACE_PEEKUSER, pid, PT_SYSCALL_NR_OFFSET,
+ 0);
+ if (syscall == __NR_getpid) {
+ n = ptrace(PTRACE_POKEUSER, pid, PT_SYSCALL_NR_OFFSET,
+ __NR_getppid);
+ if (n < 0)
+ fatal_perror("check_ptrace : failed to modify "
+ "system call");
+ break;
+ }
+ }
+ stop_ptraced_child(pid, 0, 1);
+ non_fatal("OK\n");
+ check_sysemu();
+}
+
+extern void check_tmpexec(void);
+
+static void __init check_coredump_limit(void)
+{
+ struct rlimit lim;
+ int err = getrlimit(RLIMIT_CORE, &lim);
+
+ if (err) {
+ perror("Getting core dump limit");
+ return;
+ }
+
+ printf("Core dump limits :\n\tsoft - ");
+ if (lim.rlim_cur == RLIM_INFINITY)
+ printf("NONE\n");
+ else printf("%lu\n", lim.rlim_cur);
+
+ printf("\thard - ");
+ if (lim.rlim_max == RLIM_INFINITY)
+ printf("NONE\n");
+ else printf("%lu\n", lim.rlim_max);
+}
+
+void __init os_early_checks(void)
+{
+ int pid;
+
+ /* Print out the core dump limits early */
+ check_coredump_limit();
+
+ check_ptrace();
+
+ /* Need to check this early because mmapping happens before the
+ * kernel is running.
+ */
+ check_tmpexec();
+
+ pid = start_ptraced_child();
+ if (init_registers(pid))
+ fatal("Failed to initialize default registers");
+ stop_ptraced_child(pid, 1, 1);
+}
+
+int __init parse_iomem(char *str, int *add)
+{
+ struct iomem_region *new;
+ struct stat64 buf;
+ char *file, *driver;
+ int fd, size;
+
+ driver = str;
+ file = strchr(str,',');
+ if (file == NULL) {
+ fprintf(stderr, "parse_iomem : failed to parse iomem\n");
+ goto out;
+ }
+ *file = '\0';
+ file++;
+ fd = open(file, O_RDWR, 0);
+ if (fd < 0) {
+ perror("parse_iomem - Couldn't open io file");
+ goto out;
+ }
+
+ if (fstat64(fd, &buf) < 0) {
+ perror("parse_iomem - cannot stat_fd file");
+ goto out_close;
+ }
+
+ new = malloc(sizeof(*new));
+ if (new == NULL) {
+ perror("Couldn't allocate iomem_region struct");
+ goto out_close;
+ }
+
+ size = (buf.st_size + UM_KERN_PAGE_SIZE) & ~(UM_KERN_PAGE_SIZE - 1);
+
+ *new = ((struct iomem_region) { .next = iomem_regions,
+ .driver = driver,
+ .fd = fd,
+ .size = size,
+ .phys = 0,
+ .virt = 0 });
+ iomem_regions = new;
+ iomem_size += new->size + UM_KERN_PAGE_SIZE;
+
+ return 0;
+ out_close:
+ close(fd);
+ out:
+ return 1;
+}
diff --git a/arch/um/os-Linux/time.c b/arch/um/os-Linux/time.c
new file mode 100644
index 0000000..0e39b99
--- /dev/null
+++ b/arch/um/os-Linux/time.c
@@ -0,0 +1,189 @@
+/*
+ * Copyright (C) 2015 Anton Ivanov (aivanov@{brocade.com,kot-begemot.co.uk})
+ * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
+ * Copyright (C) 2012-2014 Cisco Systems
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <stddef.h>
+#include <errno.h>
+#include <signal.h>
+#include <time.h>
+#include <sys/time.h>
+#include <kern_util.h>
+#include <os.h>
+#include <string.h>
+#include <timer-internal.h>
+
+static timer_t event_high_res_timer = 0;
+
+static inline long long timeval_to_ns(const struct timeval *tv)
+{
+ return ((long long) tv->tv_sec * UM_NSEC_PER_SEC) +
+ tv->tv_usec * UM_NSEC_PER_USEC;
+}
+
+static inline long long timespec_to_ns(const struct timespec *ts)
+{
+ return ((long long) ts->tv_sec * UM_NSEC_PER_SEC) +
+ ts->tv_nsec;
+}
+
+long long os_persistent_clock_emulation (void) {
+ struct timespec realtime_tp;
+
+ clock_gettime(CLOCK_REALTIME, &realtime_tp);
+ return timespec_to_ns(&realtime_tp);
+}
+
+/**
+ * os_timer_create() - create an new posix (interval) timer
+ */
+int os_timer_create(void* timer) {
+
+ timer_t* t = timer;
+
+ if(t == NULL) {
+ t = &event_high_res_timer;
+ }
+
+ if (timer_create(
+ CLOCK_MONOTONIC,
+ NULL,
+ t) == -1) {
+ return -1;
+ }
+ return 0;
+}
+
+int os_timer_set_interval(void* timer, void* i)
+{
+ struct itimerspec its;
+ unsigned long long nsec;
+ timer_t* t = timer;
+ struct itimerspec* its_in = i;
+
+ if(t == NULL) {
+ t = &event_high_res_timer;
+ }
+
+ nsec = UM_NSEC_PER_SEC / UM_HZ;
+
+ if(its_in != NULL) {
+ its.it_value.tv_sec = its_in->it_value.tv_sec;
+ its.it_value.tv_nsec = its_in->it_value.tv_nsec;
+ } else {
+ its.it_value.tv_sec = 0;
+ its.it_value.tv_nsec = nsec;
+ }
+
+ its.it_interval.tv_sec = 0;
+ its.it_interval.tv_nsec = nsec;
+
+ if(timer_settime(*t, 0, &its, NULL) == -1) {
+ return -errno;
+ }
+
+ return 0;
+}
+
+/**
+ * os_timer_remain() - returns the remaining nano seconds of the given interval
+ * timer
+ * Because this is the remaining time of an interval timer, which correspondends
+ * to HZ, this value can never be bigger than one second. Just
+ * the nanosecond part of the timer is returned.
+ * The returned time is relative to the start time of the interval timer.
+ * Return an negative value in an error case.
+ */
+long os_timer_remain(void* timer)
+{
+ struct itimerspec its;
+ timer_t* t = timer;
+
+ if(t == NULL) {
+ t = &event_high_res_timer;
+ }
+
+ if(timer_gettime(t, &its) == -1) {
+ return -errno;
+ }
+
+ return its.it_value.tv_nsec;
+}
+
+int os_timer_one_shot(int ticks)
+{
+ struct itimerspec its;
+ unsigned long long nsec;
+ unsigned long sec;
+
+ nsec = (ticks + 1);
+ sec = nsec / UM_NSEC_PER_SEC;
+ nsec = nsec % UM_NSEC_PER_SEC;
+
+ its.it_value.tv_sec = nsec / UM_NSEC_PER_SEC;
+ its.it_value.tv_nsec = nsec;
+
+ its.it_interval.tv_sec = 0;
+ its.it_interval.tv_nsec = 0; // we cheat here
+
+ timer_settime(event_high_res_timer, 0, &its, NULL);
+ return 0;
+}
+
+/**
+ * os_timer_disable() - disable the posix (interval) timer
+ * Returns the remaining interval timer time in nanoseconds
+ */
+long long os_timer_disable(void)
+{
+ struct itimerspec its;
+
+ memset(&its, 0, sizeof(struct itimerspec));
+ timer_settime(event_high_res_timer, 0, &its, &its);
+
+ return its.it_value.tv_sec * UM_NSEC_PER_SEC + its.it_value.tv_nsec;
+}
+
+long long os_vnsecs(void)
+{
+ struct timespec ts;
+
+ clock_gettime(CLOCK_PROCESS_CPUTIME_ID,&ts);
+ return timespec_to_ns(&ts);
+}
+
+long long os_nsecs(void)
+{
+ struct timespec ts;
+
+ clock_gettime(CLOCK_MONOTONIC,&ts);
+ return timespec_to_ns(&ts);
+}
+
+/**
+ * os_idle_sleep() - sleep for a given time of nsecs
+ * @nsecs: nanoseconds to sleep
+ */
+void os_idle_sleep(unsigned long long nsecs)
+{
+ struct timespec ts;
+
+ if (nsecs <= 0) {
+ return;
+ }
+
+ ts = ((struct timespec) {
+ .tv_sec = nsecs / UM_NSEC_PER_SEC,
+ .tv_nsec = nsecs % UM_NSEC_PER_SEC
+ });
+
+ /*
+ * Relay the signal if clock_nanosleep is interrupted.
+ */
+ if (clock_nanosleep(CLOCK_MONOTONIC, 0, &ts, NULL)) {
+ deliver_alarm();
+ }
+}
diff --git a/arch/um/os-Linux/tty.c b/arch/um/os-Linux/tty.c
new file mode 100644
index 0000000..721d8af
--- /dev/null
+++ b/arch/um/os-Linux/tty.c
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <kern_util.h>
+#include <os.h>
+
+struct grantpt_info {
+ int fd;
+ int res;
+ int err;
+};
+
+static void grantpt_cb(void *arg)
+{
+ struct grantpt_info *info = arg;
+
+ info->res = grantpt(info->fd);
+ info->err = errno;
+}
+
+int get_pty(void)
+{
+ struct grantpt_info info;
+ int fd, err;
+
+ fd = open("/dev/ptmx", O_RDWR);
+ if (fd < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "get_pty : Couldn't open /dev/ptmx - "
+ "err = %d\n", errno);
+ return err;
+ }
+
+ info.fd = fd;
+ initial_thread_cb(grantpt_cb, &info);
+
+ if (info.res < 0) {
+ err = -info.err;
+ printk(UM_KERN_ERR "get_pty : Couldn't grant pty - "
+ "errno = %d\n", -info.err);
+ goto out;
+ }
+
+ if (unlockpt(fd) < 0) {
+ err = -errno;
+ printk(UM_KERN_ERR "get_pty : Couldn't unlock pty - "
+ "errno = %d\n", errno);
+ goto out;
+ }
+ return fd;
+out:
+ close(fd);
+ return err;
+}
diff --git a/arch/um/os-Linux/umid.c b/arch/um/os-Linux/umid.c
new file mode 100644
index 0000000..c1dc892
--- /dev/null
+++ b/arch/um/os-Linux/umid.c
@@ -0,0 +1,394 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <init.h>
+#include <os.h>
+
+#define UML_DIR "~/.uml/"
+
+#define UMID_LEN 64
+
+/* Changed by set_umid, which is run early in boot */
+static char umid[UMID_LEN] = { 0 };
+
+/* Changed by set_uml_dir and make_uml_dir, which are run early in boot */
+static char *uml_dir = UML_DIR;
+
+static int __init make_uml_dir(void)
+{
+ char dir[512] = { '\0' };
+ int len, err;
+
+ if (*uml_dir == '~') {
+ char *home = getenv("HOME");
+
+ err = -ENOENT;
+ if (home == NULL) {
+ printk(UM_KERN_ERR "make_uml_dir : no value in "
+ "environment for $HOME\n");
+ goto err;
+ }
+ strlcpy(dir, home, sizeof(dir));
+ uml_dir++;
+ }
+ strlcat(dir, uml_dir, sizeof(dir));
+ len = strlen(dir);
+ if (len > 0 && dir[len - 1] != '/')
+ strlcat(dir, "/", sizeof(dir));
+
+ err = -ENOMEM;
+ uml_dir = malloc(strlen(dir) + 1);
+ if (uml_dir == NULL) {
+ printf("make_uml_dir : malloc failed, errno = %d\n", errno);
+ goto err;
+ }
+ strcpy(uml_dir, dir);
+
+ if ((mkdir(uml_dir, 0777) < 0) && (errno != EEXIST)) {
+ printf("Failed to mkdir '%s': %s\n", uml_dir, strerror(errno));
+ err = -errno;
+ goto err_free;
+ }
+ return 0;
+
+err_free:
+ free(uml_dir);
+err:
+ uml_dir = NULL;
+ return err;
+}
+
+/*
+ * Unlinks the files contained in @dir and then removes @dir.
+ * Doesn't handle directory trees, so it's not like rm -rf, but almost such. We
+ * ignore ENOENT errors for anything (they happen, strangely enough - possibly
+ * due to races between multiple dying UML threads).
+ */
+static int remove_files_and_dir(char *dir)
+{
+ DIR *directory;
+ struct dirent *ent;
+ int len;
+ char file[256];
+ int ret;
+
+ directory = opendir(dir);
+ if (directory == NULL) {
+ if (errno != ENOENT)
+ return -errno;
+ else
+ return 0;
+ }
+
+ while ((ent = readdir(directory)) != NULL) {
+ if (!strcmp(ent->d_name, ".") || !strcmp(ent->d_name, ".."))
+ continue;
+ len = strlen(dir) + sizeof("/") + strlen(ent->d_name) + 1;
+ if (len > sizeof(file)) {
+ ret = -E2BIG;
+ goto out;
+ }
+
+ sprintf(file, "%s/%s", dir, ent->d_name);
+ if (unlink(file) < 0 && errno != ENOENT) {
+ ret = -errno;
+ goto out;
+ }
+ }
+
+ if (rmdir(dir) < 0 && errno != ENOENT) {
+ ret = -errno;
+ goto out;
+ }
+
+ ret = 0;
+out:
+ closedir(directory);
+ return ret;
+}
+
+/*
+ * This says that there isn't already a user of the specified directory even if
+ * there are errors during the checking. This is because if these errors
+ * happen, the directory is unusable by the pre-existing UML, so we might as
+ * well take it over. This could happen either by
+ * the existing UML somehow corrupting its umid directory
+ * something other than UML sticking stuff in the directory
+ * this boot racing with a shutdown of the other UML
+ * In any of these cases, the directory isn't useful for anything else.
+ *
+ * Boolean return: 1 if in use, 0 otherwise.
+ */
+static inline int is_umdir_used(char *dir)
+{
+ char file[strlen(uml_dir) + UMID_LEN + sizeof("/pid\0")];
+ char pid[sizeof("nnnnn\0")], *end;
+ int dead, fd, p, n, err;
+
+ n = snprintf(file, sizeof(file), "%s/pid", dir);
+ if (n >= sizeof(file)) {
+ printk(UM_KERN_ERR "is_umdir_used - pid filename too long\n");
+ err = -E2BIG;
+ goto out;
+ }
+
+ dead = 0;
+ fd = open(file, O_RDONLY);
+ if (fd < 0) {
+ fd = -errno;
+ if (fd != -ENOENT) {
+ printk(UM_KERN_ERR "is_umdir_used : couldn't open pid "
+ "file '%s', err = %d\n", file, -fd);
+ }
+ goto out;
+ }
+
+ err = 0;
+ n = read(fd, pid, sizeof(pid));
+ if (n < 0) {
+ printk(UM_KERN_ERR "is_umdir_used : couldn't read pid file "
+ "'%s', err = %d\n", file, errno);
+ goto out_close;
+ } else if (n == 0) {
+ printk(UM_KERN_ERR "is_umdir_used : couldn't read pid file "
+ "'%s', 0-byte read\n", file);
+ goto out_close;
+ }
+
+ p = strtoul(pid, &end, 0);
+ if (end == pid) {
+ printk(UM_KERN_ERR "is_umdir_used : couldn't parse pid file "
+ "'%s', errno = %d\n", file, errno);
+ goto out_close;
+ }
+
+ if ((kill(p, 0) == 0) || (errno != ESRCH)) {
+ printk(UM_KERN_ERR "umid \"%s\" is already in use by pid %d\n",
+ umid, p);
+ return 1;
+ }
+
+out_close:
+ close(fd);
+out:
+ return 0;
+}
+
+/*
+ * Try to remove the directory @dir unless it's in use.
+ * Precondition: @dir exists.
+ * Returns 0 for success, < 0 for failure in removal or if the directory is in
+ * use.
+ */
+static int umdir_take_if_dead(char *dir)
+{
+ int ret;
+ if (is_umdir_used(dir))
+ return -EEXIST;
+
+ ret = remove_files_and_dir(dir);
+ if (ret) {
+ printk(UM_KERN_ERR "is_umdir_used - remove_files_and_dir "
+ "failed with err = %d\n", ret);
+ }
+ return ret;
+}
+
+static void __init create_pid_file(void)
+{
+ char file[strlen(uml_dir) + UMID_LEN + sizeof("/pid\0")];
+ char pid[sizeof("nnnnn\0")];
+ int fd, n;
+
+ if (umid_file_name("pid", file, sizeof(file)))
+ return;
+
+ fd = open(file, O_RDWR | O_CREAT | O_EXCL, 0644);
+ if (fd < 0) {
+ printk(UM_KERN_ERR "Open of machine pid file \"%s\" failed: "
+ "%s\n", file, strerror(errno));
+ return;
+ }
+
+ snprintf(pid, sizeof(pid), "%d\n", getpid());
+ n = write(fd, pid, strlen(pid));
+ if (n != strlen(pid))
+ printk(UM_KERN_ERR "Write of pid file failed - err = %d\n",
+ errno);
+
+ close(fd);
+}
+
+int __init set_umid(char *name)
+{
+ if (strlen(name) > UMID_LEN - 1)
+ return -E2BIG;
+
+ strlcpy(umid, name, sizeof(umid));
+
+ return 0;
+}
+
+/* Changed in make_umid, which is called during early boot */
+static int umid_setup = 0;
+
+static int __init make_umid(void)
+{
+ int fd, err;
+ char tmp[256];
+
+ if (umid_setup)
+ return 0;
+
+ make_uml_dir();
+
+ if (*umid == '\0') {
+ strlcpy(tmp, uml_dir, sizeof(tmp));
+ strlcat(tmp, "XXXXXX", sizeof(tmp));
+ fd = mkstemp(tmp);
+ if (fd < 0) {
+ printk(UM_KERN_ERR "make_umid - mkstemp(%s) failed: "
+ "%s\n", tmp, strerror(errno));
+ err = -errno;
+ goto err;
+ }
+
+ close(fd);
+
+ set_umid(&tmp[strlen(uml_dir)]);
+
+ /*
+ * There's a nice tiny little race between this unlink and
+ * the mkdir below. It'd be nice if there were a mkstemp
+ * for directories.
+ */
+ if (unlink(tmp)) {
+ err = -errno;
+ goto err;
+ }
+ }
+
+ snprintf(tmp, sizeof(tmp), "%s%s", uml_dir, umid);
+ err = mkdir(tmp, 0777);
+ if (err < 0) {
+ err = -errno;
+ if (err != -EEXIST)
+ goto err;
+
+ if (umdir_take_if_dead(tmp) < 0)
+ goto err;
+
+ err = mkdir(tmp, 0777);
+ }
+ if (err) {
+ err = -errno;
+ printk(UM_KERN_ERR "Failed to create '%s' - err = %d\n", umid,
+ errno);
+ goto err;
+ }
+
+ umid_setup = 1;
+
+ create_pid_file();
+
+ err = 0;
+ err:
+ return err;
+}
+
+static int __init make_umid_init(void)
+{
+ if (!make_umid())
+ return 0;
+
+ /*
+ * If initializing with the given umid failed, then try again with
+ * a random one.
+ */
+ printk(UM_KERN_ERR "Failed to initialize umid \"%s\", trying with a "
+ "random umid\n", umid);
+ *umid = '\0';
+ make_umid();
+
+ return 0;
+}
+
+__initcall(make_umid_init);
+
+int __init umid_file_name(char *name, char *buf, int len)
+{
+ int n, err;
+
+ err = make_umid();
+ if (err)
+ return err;
+
+ n = snprintf(buf, len, "%s%s/%s", uml_dir, umid, name);
+ if (n >= len) {
+ printk(UM_KERN_ERR "umid_file_name : buffer too short\n");
+ return -E2BIG;
+ }
+
+ return 0;
+}
+
+char *get_umid(void)
+{
+ return umid;
+}
+
+static int __init set_uml_dir(char *name, int *add)
+{
+ if (*name == '\0') {
+ printf("uml_dir can't be an empty string\n");
+ return 0;
+ }
+
+ if (name[strlen(name) - 1] == '/') {
+ uml_dir = name;
+ return 0;
+ }
+
+ uml_dir = malloc(strlen(name) + 2);
+ if (uml_dir == NULL) {
+ printf("Failed to malloc uml_dir - error = %d\n", errno);
+
+ /*
+ * Return 0 here because do_initcalls doesn't look at
+ * the return value.
+ */
+ return 0;
+ }
+ sprintf(uml_dir, "%s/", name);
+
+ return 0;
+}
+
+__uml_setup("uml_dir=", set_uml_dir,
+"uml_dir=<directory>\n"
+" The location to place the pid and umid files.\n\n"
+);
+
+static void remove_umid_dir(void)
+{
+ char dir[strlen(uml_dir) + UMID_LEN + 1], err;
+
+ sprintf(dir, "%s%s", uml_dir, umid);
+ err = remove_files_and_dir(dir);
+ if (err)
+ printf("remove_umid_dir - remove_files_and_dir failed with "
+ "err = %d\n", err);
+}
+
+__uml_exitcall(remove_umid_dir);
diff --git a/arch/um/os-Linux/user_syms.c b/arch/um/os-Linux/user_syms.c
new file mode 100644
index 0000000..db4a034
--- /dev/null
+++ b/arch/um/os-Linux/user_syms.c
@@ -0,0 +1,120 @@
+#include <linux/types.h>
+#include <linux/module.h>
+
+/* Some of this are builtin function (some are not but could in the future),
+ * so I *must* declare good prototypes for them and then EXPORT them.
+ * The kernel code uses the macro defined by include/linux/string.h,
+ * so I undef macros; the userspace code does not include that and I
+ * add an EXPORT for the glibc one.
+ */
+
+#undef strlen
+#undef strstr
+#undef memcpy
+#undef memset
+
+extern size_t strlen(const char *);
+extern void *memmove(void *, const void *, size_t);
+extern void *memset(void *, int, size_t);
+extern int printf(const char *, ...);
+
+/* If it's not defined, the export is included in lib/string.c.*/
+#ifdef __HAVE_ARCH_STRSTR
+EXPORT_SYMBOL(strstr);
+#endif
+
+#ifndef __x86_64__
+extern void *memcpy(void *, const void *, size_t);
+EXPORT_SYMBOL(memcpy);
+#endif
+
+EXPORT_SYMBOL(memmove);
+EXPORT_SYMBOL(memset);
+EXPORT_SYMBOL(printf);
+
+/* Here, instead, I can provide a fake prototype. Yes, someone cares: genksyms.
+ * However, the modules will use the CRC defined *here*, no matter if it is
+ * good; so the versions of these symbols will always match
+ */
+#define EXPORT_SYMBOL_PROTO(sym) \
+ int sym(void); \
+ EXPORT_SYMBOL(sym);
+
+extern void readdir64(void) __attribute__((weak));
+EXPORT_SYMBOL(readdir64);
+extern void truncate64(void) __attribute__((weak));
+EXPORT_SYMBOL(truncate64);
+
+#ifdef CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA
+EXPORT_SYMBOL(vsyscall_ehdr);
+EXPORT_SYMBOL(vsyscall_end);
+#endif
+
+EXPORT_SYMBOL_PROTO(__errno_location);
+
+EXPORT_SYMBOL_PROTO(access);
+EXPORT_SYMBOL_PROTO(open);
+EXPORT_SYMBOL_PROTO(open64);
+EXPORT_SYMBOL_PROTO(close);
+EXPORT_SYMBOL_PROTO(read);
+EXPORT_SYMBOL_PROTO(write);
+EXPORT_SYMBOL_PROTO(dup2);
+EXPORT_SYMBOL_PROTO(__xstat);
+EXPORT_SYMBOL_PROTO(__lxstat);
+EXPORT_SYMBOL_PROTO(__lxstat64);
+EXPORT_SYMBOL_PROTO(__fxstat64);
+EXPORT_SYMBOL_PROTO(lseek);
+EXPORT_SYMBOL_PROTO(lseek64);
+EXPORT_SYMBOL_PROTO(chown);
+EXPORT_SYMBOL_PROTO(fchown);
+EXPORT_SYMBOL_PROTO(truncate);
+EXPORT_SYMBOL_PROTO(ftruncate64);
+EXPORT_SYMBOL_PROTO(utime);
+EXPORT_SYMBOL_PROTO(utimes);
+EXPORT_SYMBOL_PROTO(futimes);
+EXPORT_SYMBOL_PROTO(chmod);
+EXPORT_SYMBOL_PROTO(fchmod);
+EXPORT_SYMBOL_PROTO(rename);
+EXPORT_SYMBOL_PROTO(__xmknod);
+
+EXPORT_SYMBOL_PROTO(symlink);
+EXPORT_SYMBOL_PROTO(link);
+EXPORT_SYMBOL_PROTO(unlink);
+EXPORT_SYMBOL_PROTO(readlink);
+
+EXPORT_SYMBOL_PROTO(mkdir);
+EXPORT_SYMBOL_PROTO(rmdir);
+EXPORT_SYMBOL_PROTO(opendir);
+EXPORT_SYMBOL_PROTO(readdir);
+EXPORT_SYMBOL_PROTO(closedir);
+EXPORT_SYMBOL_PROTO(seekdir);
+EXPORT_SYMBOL_PROTO(telldir);
+
+EXPORT_SYMBOL_PROTO(ioctl);
+
+EXPORT_SYMBOL_PROTO(pread64);
+EXPORT_SYMBOL_PROTO(pwrite64);
+
+EXPORT_SYMBOL_PROTO(statfs);
+EXPORT_SYMBOL_PROTO(statfs64);
+
+EXPORT_SYMBOL_PROTO(getuid);
+
+EXPORT_SYMBOL_PROTO(fsync);
+EXPORT_SYMBOL_PROTO(fdatasync);
+
+EXPORT_SYMBOL_PROTO(lstat64);
+EXPORT_SYMBOL_PROTO(fstat64);
+EXPORT_SYMBOL_PROTO(mknod);
+
+/* Export symbols used by GCC for the stack protector. */
+extern void __stack_smash_handler(void *) __attribute__((weak));
+EXPORT_SYMBOL(__stack_smash_handler);
+
+extern long __guard __attribute__((weak));
+EXPORT_SYMBOL(__guard);
+
+#ifdef _FORTIFY_SOURCE
+extern int __sprintf_chk(char *str, int flag, size_t strlen, const char *format);
+EXPORT_SYMBOL(__sprintf_chk);
+#endif
diff --git a/arch/um/os-Linux/util.c b/arch/um/os-Linux/util.c
new file mode 100644
index 0000000..faee55e
--- /dev/null
+++ b/arch/um/os-Linux/util.c
@@ -0,0 +1,154 @@
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <signal.h>
+#include <string.h>
+#include <termios.h>
+#include <wait.h>
+#include <sys/mman.h>
+#include <sys/utsname.h>
+#include <os.h>
+
+void stack_protections(unsigned long address)
+{
+ if (mprotect((void *) address, UM_THREAD_SIZE,
+ PROT_READ | PROT_WRITE | PROT_EXEC) < 0)
+ panic("protecting stack failed, errno = %d", errno);
+}
+
+int raw(int fd)
+{
+ struct termios tt;
+ int err;
+
+ CATCH_EINTR(err = tcgetattr(fd, &tt));
+ if (err < 0)
+ return -errno;
+
+ cfmakeraw(&tt);
+
+ CATCH_EINTR(err = tcsetattr(fd, TCSADRAIN, &tt));
+ if (err < 0)
+ return -errno;
+
+ /*
+ * XXX tcsetattr could have applied only some changes
+ * (and cfmakeraw() is a set of changes)
+ */
+ return 0;
+}
+
+void setup_machinename(char *machine_out)
+{
+ struct utsname host;
+
+ uname(&host);
+#ifdef UML_CONFIG_UML_X86
+# ifndef UML_CONFIG_64BIT
+ if (!strcmp(host.machine, "x86_64")) {
+ strcpy(machine_out, "i686");
+ return;
+ }
+# else
+ if (!strcmp(host.machine, "i686")) {
+ strcpy(machine_out, "x86_64");
+ return;
+ }
+# endif
+#endif
+ strcpy(machine_out, host.machine);
+}
+
+void setup_hostinfo(char *buf, int len)
+{
+ struct utsname host;
+
+ uname(&host);
+ snprintf(buf, len, "%s %s %s %s %s", host.sysname, host.nodename,
+ host.release, host.version, host.machine);
+}
+
+/*
+ * We cannot use glibc's abort(). It makes use of tgkill() which
+ * has no effect within UML's kernel threads.
+ * After that glibc would execute an invalid instruction to kill
+ * the calling process and UML crashes with SIGSEGV.
+ */
+static inline void __attribute__ ((noreturn)) uml_abort(void)
+{
+ sigset_t sig;
+
+ fflush(NULL);
+
+ if (!sigemptyset(&sig) && !sigaddset(&sig, SIGABRT))
+ sigprocmask(SIG_UNBLOCK, &sig, 0);
+
+ for (;;)
+ if (kill(getpid(), SIGABRT) < 0)
+ exit(127);
+}
+
+/*
+ * UML helper threads must not handle SIGWINCH/INT/TERM
+ */
+void os_fix_helper_signals(void)
+{
+ signal(SIGWINCH, SIG_IGN);
+ signal(SIGINT, SIG_DFL);
+ signal(SIGTERM, SIG_DFL);
+}
+
+void os_dump_core(void)
+{
+ int pid;
+
+ signal(SIGSEGV, SIG_DFL);
+
+ /*
+ * We are about to SIGTERM this entire process group to ensure that
+ * nothing is around to run after the kernel exits. The
+ * kernel wants to abort, not die through SIGTERM, so we
+ * ignore it here.
+ */
+
+ signal(SIGTERM, SIG_IGN);
+ kill(0, SIGTERM);
+ /*
+ * Most of the other processes associated with this UML are
+ * likely sTopped, so give them a SIGCONT so they see the
+ * SIGTERM.
+ */
+ kill(0, SIGCONT);
+
+ /*
+ * Now, having sent signals to everyone but us, make sure they
+ * die by ptrace. Processes can survive what's been done to
+ * them so far - the mechanism I understand is receiving a
+ * SIGSEGV and segfaulting immediately upon return. There is
+ * always a SIGSEGV pending, and (I'm guessing) signals are
+ * processed in numeric order so the SIGTERM (signal 15 vs
+ * SIGSEGV being signal 11) is never handled.
+ *
+ * Run a waitpid loop until we get some kind of error.
+ * Hopefully, it's ECHILD, but there's not a lot we can do if
+ * it's something else. Tell os_kill_ptraced_process not to
+ * wait for the child to report its death because there's
+ * nothing reasonable to do if that fails.
+ */
+
+ while ((pid = waitpid(-1, NULL, WNOHANG | __WALL)) > 0)
+ os_kill_ptraced_process(pid, 0);
+
+ uml_abort();
+}
+
+void um_early_printk(const char *s, unsigned int n)
+{
+ printf("%.*s", n, s);
+}
diff --git a/arch/um/scripts/Makefile.rules b/arch/um/scripts/Makefile.rules
new file mode 100644
index 0000000..15889df
--- /dev/null
+++ b/arch/um/scripts/Makefile.rules
@@ -0,0 +1,26 @@
+# ===========================================================================
+# arch/um: Generic definitions
+# ===========================================================================
+
+USER_SINGLE_OBJS := \
+ $(foreach f,$(patsubst %.o,%,$(obj-y) $(obj-m)),$($(f)-objs))
+USER_OBJS += $(filter %_user.o,$(obj-y) $(obj-m) $(USER_SINGLE_OBJS))
+USER_OBJS := $(foreach file,$(USER_OBJS),$(obj)/$(file))
+
+$(USER_OBJS:.o=.%): \
+ c_flags = -Wp,-MD,$(depfile) $(USER_CFLAGS) -include $(srctree)/include/linux/kern_levels.h -include user.h $(CFLAGS_$(basetarget).o)
+
+# These are like USER_OBJS but filter USER_CFLAGS through unprofile instead of
+# using it directly.
+UNPROFILE_OBJS := $(foreach file,$(UNPROFILE_OBJS),$(obj)/$(file))
+
+$(UNPROFILE_OBJS:.o=.%): \
+ c_flags = -Wp,-MD,$(depfile) $(call unprofile,$(USER_CFLAGS)) $(CFLAGS_$(basetarget).o)
+
+$(USER_OBJS) $(UNPROFILE_OBJS): \
+ CHECKFLAGS := $(patsubst $(NOSTDINC_FLAGS),,$(CHECKFLAGS))
+
+# The stubs can't try to call mcount or update basic block data
+define unprofile
+ $(patsubst -pg,,$(patsubst -fprofile-arcs -ftest-coverage,,$(1)))
+endef