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/mips/kernel/linux32.c b/arch/mips/kernel/linux32.c
new file mode 100644
index 0000000..0b29646
--- /dev/null
+++ b/arch/mips/kernel/linux32.c
@@ -0,0 +1,167 @@
+/*
+ * Conversion between 32-bit and 64-bit native system calls.
+ *
+ * Copyright (C) 2000 Silicon Graphics, Inc.
+ * Written by Ulf Carlsson (ulfc@engr.sgi.com)
+ */
+#include <linux/compiler.h>
+#include <linux/mm.h>
+#include <linux/errno.h>
+#include <linux/file.h>
+#include <linux/highuid.h>
+#include <linux/resource.h>
+#include <linux/highmem.h>
+#include <linux/time.h>
+#include <linux/times.h>
+#include <linux/poll.h>
+#include <linux/skbuff.h>
+#include <linux/filter.h>
+#include <linux/shm.h>
+#include <linux/sem.h>
+#include <linux/msg.h>
+#include <linux/icmpv6.h>
+#include <linux/syscalls.h>
+#include <linux/sysctl.h>
+#include <linux/utime.h>
+#include <linux/utsname.h>
+#include <linux/personality.h>
+#include <linux/dnotify.h>
+#include <linux/module.h>
+#include <linux/binfmts.h>
+#include <linux/security.h>
+#include <linux/compat.h>
+#include <linux/vfs.h>
+#include <linux/ipc.h>
+#include <linux/slab.h>
+
+#include <net/sock.h>
+#include <net/scm.h>
+
+#include <asm/compat-signal.h>
+#include <asm/sim.h>
+#include <asm/uaccess.h>
+#include <asm/mmu_context.h>
+#include <asm/mman.h>
+
+/* Use this to get at 32-bit user passed pointers. */
+/* A() macro should be used for places where you e.g.
+ have some internal variable u32 and just want to get
+ rid of a compiler warning. AA() has to be used in
+ places where you want to convert a function argument
+ to 32bit pointer or when you e.g. access pt_regs
+ structure and want to consider 32bit registers only.
+ */
+#define A(__x) ((unsigned long)(__x))
+#define AA(__x) ((unsigned long)((int)__x))
+
+#ifdef __MIPSEB__
+#define merge_64(r1, r2) ((((r1) & 0xffffffffUL) << 32) + ((r2) & 0xffffffffUL))
+#endif
+#ifdef __MIPSEL__
+#define merge_64(r1, r2) ((((r2) & 0xffffffffUL) << 32) + ((r1) & 0xffffffffUL))
+#endif
+
+SYSCALL_DEFINE6(32_mmap2, unsigned long, addr, unsigned long, len,
+ unsigned long, prot, unsigned long, flags, unsigned long, fd,
+ unsigned long, pgoff)
+{
+ unsigned long error;
+
+ error = -EINVAL;
+ if (pgoff & (~PAGE_MASK >> 12))
+ goto out;
+ error = sys_mmap_pgoff(addr, len, prot, flags, fd,
+ pgoff >> (PAGE_SHIFT-12));
+out:
+ return error;
+}
+
+#define RLIM_INFINITY32 0x7fffffff
+#define RESOURCE32(x) ((x > RLIM_INFINITY32) ? RLIM_INFINITY32 : x)
+
+struct rlimit32 {
+ int rlim_cur;
+ int rlim_max;
+};
+
+SYSCALL_DEFINE4(32_truncate64, const char __user *, path,
+ unsigned long, __dummy, unsigned long, a2, unsigned long, a3)
+{
+ return sys_truncate(path, merge_64(a2, a3));
+}
+
+SYSCALL_DEFINE4(32_ftruncate64, unsigned long, fd, unsigned long, __dummy,
+ unsigned long, a2, unsigned long, a3)
+{
+ return sys_ftruncate(fd, merge_64(a2, a3));
+}
+
+SYSCALL_DEFINE5(32_llseek, unsigned int, fd, unsigned int, offset_high,
+ unsigned int, offset_low, loff_t __user *, result,
+ unsigned int, origin)
+{
+ return sys_llseek(fd, offset_high, offset_low, result, origin);
+}
+
+/* From the Single Unix Spec: pread & pwrite act like lseek to pos + op +
+ lseek back to original location. They fail just like lseek does on
+ non-seekable files. */
+
+SYSCALL_DEFINE6(32_pread, unsigned long, fd, char __user *, buf, size_t, count,
+ unsigned long, unused, unsigned long, a4, unsigned long, a5)
+{
+ return sys_pread64(fd, buf, count, merge_64(a4, a5));
+}
+
+SYSCALL_DEFINE6(32_pwrite, unsigned int, fd, const char __user *, buf,
+ size_t, count, u32, unused, u64, a4, u64, a5)
+{
+ return sys_pwrite64(fd, buf, count, merge_64(a4, a5));
+}
+
+SYSCALL_DEFINE1(32_personality, unsigned long, personality)
+{
+ unsigned int p = personality & 0xffffffff;
+ int ret;
+
+ if (personality(current->personality) == PER_LINUX32 &&
+ personality(p) == PER_LINUX)
+ p = (p & ~PER_MASK) | PER_LINUX32;
+ ret = sys_personality(p);
+ if (ret != -1 && personality(ret) == PER_LINUX32)
+ ret = (ret & ~PER_MASK) | PER_LINUX;
+ return ret;
+}
+
+asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3,
+ size_t count)
+{
+ return sys_readahead(fd, merge_64(a2, a3), count);
+}
+
+asmlinkage long sys32_sync_file_range(int fd, int __pad,
+ unsigned long a2, unsigned long a3,
+ unsigned long a4, unsigned long a5,
+ int flags)
+{
+ return sys_sync_file_range(fd,
+ merge_64(a2, a3), merge_64(a4, a5),
+ flags);
+}
+
+asmlinkage long sys32_fadvise64_64(int fd, int __pad,
+ unsigned long a2, unsigned long a3,
+ unsigned long a4, unsigned long a5,
+ int flags)
+{
+ return sys_fadvise64_64(fd,
+ merge_64(a2, a3), merge_64(a4, a5),
+ flags);
+}
+
+asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2,
+ unsigned offset_a3, unsigned len_a4, unsigned len_a5)
+{
+ return sys_fallocate(fd, mode, merge_64(offset_a2, offset_a3),
+ merge_64(len_a4, len_a5));
+}