| /* vi: set sw=4 ts=4: */ |
| /* |
| Copyright 2006, Bernhard Fischer |
| |
| Licensed under the GPL v2 or later, see the file LICENSE in this tarball. |
| */ |
| #ifndef __PLATFORM_H |
| #define __PLATFORM_H 1 |
| |
| /* Convenience macros to test the version of gcc. */ |
| #undef __GNUC_PREREQ |
| #if defined __GNUC__ && defined __GNUC_MINOR__ |
| # define __GNUC_PREREQ(maj, min) \ |
| ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min)) |
| #else |
| # define __GNUC_PREREQ(maj, min) 0 |
| #endif |
| |
| /* __restrict is known in EGCS 1.2 and above. */ |
| #if !__GNUC_PREREQ(2,92) |
| # ifndef __restrict |
| # define __restrict /* Ignore */ |
| # endif |
| #endif |
| |
| /* Define macros for some gcc attributes. This permits us to use the |
| macros freely, and know that they will come into play for the |
| version of gcc in which they are supported. */ |
| |
| #if !__GNUC_PREREQ(2,7) |
| # ifndef __attribute__ |
| # define __attribute__(x) |
| # endif |
| #endif |
| |
| #undef inline |
| #if defined(__STDC_VERSION__) && __STDC_VERSION__ > 199901L |
| /* it's a keyword */ |
| #else |
| # if __GNUC_PREREQ(2,7) |
| # define inline __inline__ |
| # else |
| # define inline |
| # endif |
| #endif |
| |
| #ifndef __const |
| # define __const const |
| #endif |
| |
| #define ATTRIBUTE_UNUSED __attribute__ ((__unused__)) |
| #define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__)) |
| #define ATTRIBUTE_PACKED __attribute__ ((__packed__)) |
| #define ATTRIBUTE_ALIGNED(m) __attribute__ ((__aligned__(m))) |
| /* __NO_INLINE__: some gcc's do not honor inlining! :( */ |
| #if __GNUC_PREREQ(3,0) && !defined(__NO_INLINE__) |
| # define ALWAYS_INLINE __attribute__ ((always_inline)) inline |
| /* I've seen a toolchain where I needed __noinline__ instead of noinline */ |
| # define NOINLINE __attribute__((__noinline__)) |
| # if !ENABLE_WERROR |
| # define ATTRIBUTE_DEPRECATED __attribute__ ((__deprecated__)) |
| # define ATTRIBUTE_UNUSED_RESULT __attribute__ ((warn_unused_result)) |
| # else |
| # define ATTRIBUTE_DEPRECATED /* n/a */ |
| # define ATTRIBUTE_UNUSED_RESULT /* n/a */ |
| # endif |
| #else |
| # define ALWAYS_INLINE inline /* n/a */ |
| # define NOINLINE /* n/a */ |
| # define ATTRIBUTE_DEPRECATED /* n/a */ |
| # define ATTRIBUTE_UNUSED_RESULT /* n/a */ |
| #endif |
| |
| /* -fwhole-program makes all symbols local. The attribute externally_visible |
| forces a symbol global. */ |
| #if __GNUC_PREREQ(4,1) |
| # define EXTERNALLY_VISIBLE __attribute__(( visibility("default") )) |
| //__attribute__ ((__externally_visible__)) |
| #else |
| # define EXTERNALLY_VISIBLE |
| #endif /* GNUC >= 4.1 */ |
| |
| /* We use __extension__ in some places to suppress -pedantic warnings |
| about GCC extensions. This feature didn't work properly before |
| gcc 2.8. */ |
| #if !__GNUC_PREREQ(2,8) |
| # ifndef __extension__ |
| # define __extension__ |
| # endif |
| #endif |
| |
| /* gcc-2.95 had no va_copy but only __va_copy. */ |
| #if !__GNUC_PREREQ(3,0) |
| # include <stdarg.h> |
| # if !defined va_copy && defined __va_copy |
| # define va_copy(d,s) __va_copy((d),(s)) |
| # endif |
| #endif |
| |
| /* FAST_FUNC is a qualifier which (possibly) makes function call faster |
| * and/or smaller by using modified ABI. It is usually only needed |
| * on non-static, busybox internal functions. Recent versions of gcc |
| * optimize statics automatically. FAST_FUNC on static is required |
| * only if you need to match a function pointer's type */ |
| #if __GNUC_PREREQ(3,0) && defined(i386) /* || defined(__x86_64__)? */ |
| /* stdcall makes callee to pop arguments from stack, not caller */ |
| # define FAST_FUNC __attribute__((regparm(3),stdcall)) |
| /* #elif ... - add your favorite arch today! */ |
| #else |
| # define FAST_FUNC |
| #endif |
| |
| /* ---- Endian Detection ------------------------------------ */ |
| |
| #if (defined __digital__ && defined __unix__) |
| # include <sex.h> |
| # define __BIG_ENDIAN__ (BYTE_ORDER == BIG_ENDIAN) |
| # define __BYTE_ORDER BYTE_ORDER |
| #elif !defined __APPLE__ |
| # include <byteswap.h> |
| # include <endian.h> |
| #endif |
| |
| #ifdef __BIG_ENDIAN__ |
| # define BB_BIG_ENDIAN 1 |
| # define BB_LITTLE_ENDIAN 0 |
| #elif __BYTE_ORDER == __BIG_ENDIAN |
| # define BB_BIG_ENDIAN 1 |
| # define BB_LITTLE_ENDIAN 0 |
| #else |
| # define BB_BIG_ENDIAN 0 |
| # define BB_LITTLE_ENDIAN 1 |
| #endif |
| |
| #if BB_BIG_ENDIAN |
| #define SWAP_BE16(x) (x) |
| #define SWAP_BE32(x) (x) |
| #define SWAP_BE64(x) (x) |
| #define SWAP_LE16(x) bswap_16(x) |
| #define SWAP_LE32(x) bswap_32(x) |
| #define SWAP_LE64(x) bswap_64(x) |
| #else |
| #define SWAP_BE16(x) bswap_16(x) |
| #define SWAP_BE32(x) bswap_32(x) |
| #define SWAP_BE64(x) bswap_64(x) |
| #define SWAP_LE16(x) (x) |
| #define SWAP_LE32(x) (x) |
| #define SWAP_LE64(x) (x) |
| #endif |
| |
| /* ---- Unaligned access ------------------------------------ */ |
| |
| /* parameter is supposed to be an uint32_t* ptr */ |
| #if defined(i386) || defined(__x86_64__) |
| #define get_unaligned_u32p(u32p) (*(u32p)) |
| /* #elif ... - add your favorite arch today! */ |
| #else |
| /* performs reasonably well (gcc usually inlines memcpy here) */ |
| #define get_unaligned_u32p(u32p) ({ uint32_t __t; memcpy(&__t, (u32p), 4); __t; }) |
| #endif |
| |
| /* ---- Networking ------------------------------------------ */ |
| |
| #ifndef __APPLE__ |
| # include <arpa/inet.h> |
| # ifndef __socklen_t_defined |
| typedef int socklen_t; |
| # endif |
| #else |
| # include <netinet/in.h> |
| #endif |
| |
| /* ---- Compiler dependent settings ------------------------- */ |
| |
| #if (defined __digital__ && defined __unix__) || defined __APPLE__ |
| # undef HAVE_MNTENT_H |
| # undef HAVE_SYS_STATFS_H |
| #else |
| # define HAVE_MNTENT_H 1 |
| # define HAVE_SYS_STATFS_H 1 |
| #endif /* ___digital__ && __unix__ */ |
| |
| /* linux/loop.h relies on __u64. Make sure we have that as a proper type |
| * until userspace is widely fixed. */ |
| #if (defined __INTEL_COMPILER && !defined __GNUC__) || \ |
| (defined __GNUC__ && defined __STRICT_ANSI__) |
| __extension__ typedef __signed__ long long __s64; |
| __extension__ typedef unsigned long long __u64; |
| #endif |
| |
| /*----- Kernel versioning ------------------------------------*/ |
| |
| #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c)) |
| |
| /* ---- Miscellaneous --------------------------------------- */ |
| |
| #if defined(__GNU_LIBRARY__) && __GNU_LIBRARY__ < 5 && \ |
| !defined(__dietlibc__) && \ |
| !defined(_NEWLIB_VERSION) && \ |
| !(defined __digital__ && defined __unix__) |
| # error "Sorry, this libc version is not supported :(" |
| #endif |
| |
| /* Don't perpetuate e2fsck crap into the headers. Clean up e2fsck instead. */ |
| |
| #if defined __GLIBC__ || defined __UCLIBC__ \ |
| || defined __dietlibc__ || defined _NEWLIB_VERSION |
| #include <features.h> |
| #define HAVE_FEATURES_H |
| #include <stdint.h> |
| #define HAVE_STDINT_H |
| #elif !defined __APPLE__ |
| /* Largest integral types. */ |
| #if __BIG_ENDIAN__ |
| typedef long intmax_t; |
| typedef unsigned long uintmax_t; |
| #else |
| __extension__ |
| typedef long long intmax_t; |
| __extension__ |
| typedef unsigned long long uintmax_t; |
| #endif |
| #endif |
| |
| /* Size-saving "small" ints (arch-dependent) */ |
| #if defined(i386) || defined(__x86_64__) || defined(__mips__) || defined(__cris__) |
| /* add other arches which benefit from this... */ |
| typedef signed char smallint; |
| typedef unsigned char smalluint; |
| #else |
| /* for arches where byte accesses generate larger code: */ |
| typedef int smallint; |
| typedef unsigned smalluint; |
| #endif |
| |
| /* ISO C Standard: 7.16 Boolean type and values <stdbool.h> */ |
| #if (defined __digital__ && defined __unix__) |
| /* old system without (proper) C99 support */ |
| #define bool smalluint |
| #else |
| /* modern system, so use it */ |
| #include <stdbool.h> |
| #endif |
| |
| /* Try to defeat gcc's alignment of "char message[]"-like data */ |
| #if 1 /* if needed: !defined(arch1) && !defined(arch2) */ |
| #define ALIGN1 __attribute__((aligned(1))) |
| #define ALIGN2 __attribute__((aligned(2))) |
| #else |
| /* Arches which MUST have 2 or 4 byte alignment for everything are here */ |
| #define ALIGN1 |
| #define ALIGN2 |
| #endif |
| |
| |
| /* uclibc does not implement daemon() for no-mmu systems. |
| * For 0.9.29 and svn, __ARCH_USE_MMU__ indicates no-mmu reliably. |
| * For earlier versions there is no reliable way to check if we are building |
| * for a mmu-less system. |
| */ |
| #if ENABLE_NOMMU || \ |
| (defined __UCLIBC__ && __UCLIBC_MAJOR__ >= 0 && __UCLIBC_MINOR__ >= 9 && \ |
| __UCLIBC_SUBLEVEL__ > 28 && !defined __ARCH_USE_MMU__) |
| #define BB_MMU 0 |
| #define USE_FOR_NOMMU(...) __VA_ARGS__ |
| #define USE_FOR_MMU(...) |
| #else |
| #define BB_MMU 1 |
| #define USE_FOR_NOMMU(...) |
| #define USE_FOR_MMU(...) __VA_ARGS__ |
| #endif |
| |
| /* Platforms that haven't got dprintf need to implement fdprintf() in |
| * libbb. This would require a platform.c. It's not going to be cleaned |
| * out of the tree, so stop saying it should be. */ |
| #if !defined(__dietlibc__) |
| /* Needed for: glibc */ |
| /* Not needed for: dietlibc */ |
| /* Others: ?? (add as needed) */ |
| #define fdprintf dprintf |
| #endif |
| |
| #if defined(__dietlibc__) |
| static ALWAYS_INLINE char* strchrnul(const char *s, char c) |
| { |
| while (*s && *s != c) ++s; |
| return (char*)s; |
| } |
| #endif |
| |
| /* Don't use lchown with glibc older than 2.1.x ... uClibc lacks it */ |
| #if (defined __GLIBC__ && __GLIBC__ <= 2 && __GLIBC_MINOR__ < 1) || \ |
| defined __UC_LIBC__ |
| # define lchown chown |
| #endif |
| |
| #if (defined __digital__ && defined __unix__) |
| #include <standards.h> |
| #define HAVE_STANDARDS_H |
| #include <inttypes.h> |
| #define HAVE_INTTYPES_H |
| #define PRIu32 "u" |
| |
| /* use legacy setpgrp(pid_t,pid_t) for now. move to platform.c */ |
| #define bb_setpgrp() do { pid_t __me = getpid(); setpgrp(__me,__me); } while (0) |
| |
| #if !defined ADJ_OFFSET_SINGLESHOT && defined MOD_CLKA && defined MOD_OFFSET |
| #define ADJ_OFFSET_SINGLESHOT (MOD_CLKA | MOD_OFFSET) |
| #endif |
| #if !defined ADJ_FREQUENCY && defined MOD_FREQUENCY |
| #define ADJ_FREQUENCY MOD_FREQUENCY |
| #endif |
| #if !defined ADJ_TIMECONST && defined MOD_TIMECONST |
| #define ADJ_TIMECONST MOD_TIMECONST |
| #endif |
| #if !defined ADJ_TICK && defined MOD_CLKB |
| #define ADJ_TICK MOD_CLKB |
| #endif |
| |
| #else |
| #define bb_setpgrp() setpgrp() |
| #endif |
| |
| #if defined(__linux__) |
| #include <sys/mount.h> |
| /* Make sure we have all the new mount flags we actually try to use. */ |
| #ifndef MS_BIND |
| #define MS_BIND (1<<12) |
| #endif |
| #ifndef MS_MOVE |
| #define MS_MOVE (1<<13) |
| #endif |
| #ifndef MS_RECURSIVE |
| #define MS_RECURSIVE (1<<14) |
| #endif |
| #ifndef MS_SILENT |
| #define MS_SILENT (1<<15) |
| #endif |
| |
| /* The shared subtree stuff, which went in around 2.6.15. */ |
| #ifndef MS_UNBINDABLE |
| #define MS_UNBINDABLE (1<<17) |
| #endif |
| #ifndef MS_PRIVATE |
| #define MS_PRIVATE (1<<18) |
| #endif |
| #ifndef MS_SLAVE |
| #define MS_SLAVE (1<<19) |
| #endif |
| #ifndef MS_SHARED |
| #define MS_SHARED (1<<20) |
| #endif |
| |
| |
| #if !defined(BLKSSZGET) |
| #define BLKSSZGET _IO(0x12, 104) |
| #endif |
| #if !defined(BLKGETSIZE64) |
| #define BLKGETSIZE64 _IOR(0x12,114,size_t) |
| #endif |
| #endif |
| |
| #endif /* platform.h */ |