/* vi: set sw=4 ts=4: */ /* * Copyright 2006, Bernhard Reutner-Fischer * * Licensed under GPLv2 or later, see file LICENSE in this source tree. */ #ifndef BB_PLATFORM_H #define BB_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 # endif #endif #if !__GNUC_PREREQ(2,7) # ifndef __attribute__ # define __attribute__(x) # endif #endif #if !__GNUC_PREREQ(5,0) # define deprecated(msg) deprecated #endif #undef inline #if defined(__STDC_VERSION__) && __STDC_VERSION__ > 199901L /* it's a keyword */ #elif __GNUC_PREREQ(2,7) # define inline __inline__ #else # define inline #endif #ifndef __const # define __const const #endif #define UNUSED_PARAM __attribute__ ((__unused__)) #define NORETURN __attribute__ ((__noreturn__)) #if __GNUC_PREREQ(4,5) # define bb_unreachable(altcode) __builtin_unreachable() #else # define bb_unreachable(altcode) altcode #endif /* "The malloc attribute is used to tell the compiler that a function * may be treated as if any non-NULL pointer it returns cannot alias * any other pointer valid when the function returns. This will often * improve optimization. Standard functions with this property include * malloc and calloc. realloc-like functions have this property as long * as the old pointer is never referred to (including comparing it * to the new pointer) after the function returns a non-NULL value." */ #define RETURNS_MALLOC __attribute__ ((malloc)) #define PACKED __attribute__ ((__packed__)) #define 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 DEPRECATED __attribute__ ((__deprecated__)) # define UNUSED_PARAM_RESULT __attribute__ ((warn_unused_result)) # else # define DEPRECATED # define UNUSED_PARAM_RESULT # endif #else # define ALWAYS_INLINE inline # define NOINLINE # define DEPRECATED # define UNUSED_PARAM_RESULT #endif /* used by unit test machinery to run registration functions before calling main() */ #define INIT_FUNC __attribute__ ((constructor)) /* -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 /* At 4.4 gcc become much more anal about this, need to use "aliased" types */ #if __GNUC_PREREQ(4,4) # define FIX_ALIASING __attribute__((__may_alias__)) #else # define FIX_ALIASING #endif /* 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 /* 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. * FAST_FUNC may not work well with -flto so allow user to disable this. * (-DFAST_FUNC= ) */ #ifndef FAST_FUNC # if __GNUC_PREREQ(3,0) && defined(i386) /* 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 #endif /* Make all declarations hidden (-fvisibility flag only affects definitions) */ /* (don't include system headers after this until corresponding pop!) */ #if __GNUC_PREREQ(4,1) && !defined(__CYGWIN__) # define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN _Pragma("GCC visibility push(hidden)") # define POP_SAVED_FUNCTION_VISIBILITY _Pragma("GCC visibility pop") #else # define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN # define POP_SAVED_FUNCTION_VISIBILITY #endif /* gcc-2.95 had no va_copy but only __va_copy. */ #if !__GNUC_PREREQ(3,0) # include # if !defined va_copy && defined __va_copy # define va_copy(d,s) __va_copy((d),(s)) # endif #endif /* ---- Endian Detection ------------------------------------ */ #include #if defined(__digital__) && defined(__unix__) # include #elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) \ || defined(__APPLE__) # include /* rlimit */ # include # define bswap_64 __bswap64 # define bswap_32 __bswap32 # define bswap_16 __bswap16 #else # include # include #endif #if defined(__BYTE_ORDER) && __BYTE_ORDER == __BIG_ENDIAN # define BB_BIG_ENDIAN 1 # define BB_LITTLE_ENDIAN 0 #elif defined(__BYTE_ORDER) && __BYTE_ORDER == __LITTLE_ENDIAN # define BB_BIG_ENDIAN 0 # define BB_LITTLE_ENDIAN 1 #elif defined(_BYTE_ORDER) && _BYTE_ORDER == _BIG_ENDIAN # define BB_BIG_ENDIAN 1 # define BB_LITTLE_ENDIAN 0 #elif defined(_BYTE_ORDER) && _BYTE_ORDER == _LITTLE_ENDIAN # define BB_BIG_ENDIAN 0 # define BB_LITTLE_ENDIAN 1 #elif defined(BYTE_ORDER) && BYTE_ORDER == BIG_ENDIAN # define BB_BIG_ENDIAN 1 # define BB_LITTLE_ENDIAN 0 #elif defined(BYTE_ORDER) && BYTE_ORDER == LITTLE_ENDIAN # define BB_BIG_ENDIAN 0 # define BB_LITTLE_ENDIAN 1 #elif defined(__386__) # define BB_BIG_ENDIAN 0 # define BB_LITTLE_ENDIAN 1 #else # error "Can't determine endianness" #endif #if ULONG_MAX > 0xffffffff # define bb_bswap_64(x) bswap_64(x) #endif /* SWAP_LEnn means "convert CPU<->little_endian by swapping bytes" */ #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) bb_bswap_64(x) # define IF_BIG_ENDIAN(...) __VA_ARGS__ # define IF_LITTLE_ENDIAN(...) #else # define SWAP_BE16(x) bswap_16(x) # define SWAP_BE32(x) bswap_32(x) # define SWAP_BE64(x) bb_bswap_64(x) # define SWAP_LE16(x) (x) # define SWAP_LE32(x) (x) # define SWAP_LE64(x) (x) # define IF_BIG_ENDIAN(...) # define IF_LITTLE_ENDIAN(...) __VA_ARGS__ #endif /* ---- Unaligned access ------------------------------------ */ #include typedef int bb__aliased_int FIX_ALIASING; typedef long bb__aliased_long FIX_ALIASING; typedef uint16_t bb__aliased_uint16_t FIX_ALIASING; typedef uint32_t bb__aliased_uint32_t FIX_ALIASING; typedef uint64_t bb__aliased_uint64_t FIX_ALIASING; /* NB: unaligned parameter should be a pointer, aligned one - * a lvalue. This makes it more likely to not swap them by mistake */ #if defined(i386) || defined(__x86_64__) || defined(__powerpc__) # define BB_UNALIGNED_MEMACCESS_OK 1 # define move_from_unaligned_int(v, intp) ((v) = *(bb__aliased_int*)(intp)) # define move_from_unaligned_long(v, longp) ((v) = *(bb__aliased_long*)(longp)) # define move_from_unaligned16(v, u16p) ((v) = *(bb__aliased_uint16_t*)(u16p)) # define move_from_unaligned32(v, u32p) ((v) = *(bb__aliased_uint32_t*)(u32p)) # define move_to_unaligned16(u16p, v) (*(bb__aliased_uint16_t*)(u16p) = (v)) # define move_to_unaligned32(u32p, v) (*(bb__aliased_uint32_t*)(u32p) = (v)) # define move_to_unaligned64(u64p, v) (*(bb__aliased_uint64_t*)(u64p) = (v)) /* #elif ... - add your favorite arch today! */ #else # define BB_UNALIGNED_MEMACCESS_OK 0 /* performs reasonably well (gcc usually inlines memcpy here) */ # define move_from_unaligned_int(v, intp) (memcpy(&(v), (intp), sizeof(int))) # define move_from_unaligned_long(v, longp) (memcpy(&(v), (longp), sizeof(long))) # define move_from_unaligned16(v, u16p) (memcpy(&(v), (u16p), 2)) # define move_from_unaligned32(v, u32p) (memcpy(&(v), (u32p), 4)) # define move_to_unaligned16(u16p, v) do { \ uint16_t __t = (v); \ memcpy((u16p), &__t, 2); \ } while (0) # define move_to_unaligned32(u32p, v) do { \ uint32_t __t = (v); \ memcpy((u32p), &__t, 4); \ } while (0) # define move_to_unaligned64(u64p, v) do { \ uint64_t __t = (v); \ memcpy((u64p), &__t, 8); \ } while (0) #endif /* Unaligned, fixed-endian accessors */ #define get_unaligned_le32(buf) ({ uint32_t v; move_from_unaligned32(v, buf); SWAP_LE32(v); }) #define get_unaligned_be32(buf) ({ uint32_t v; move_from_unaligned32(v, buf); SWAP_BE32(v); }) #define put_unaligned_le32(val, buf) move_to_unaligned32(buf, SWAP_LE32(val)) #define put_unaligned_be32(val, buf) move_to_unaligned32(buf, SWAP_BE32(val)) /* unxz needs an aligned fixed-endian accessor. * (however, the compiler does not realize it's aligned, the cast is still necessary) */ #define get_le32(u32p) ({ uint32_t v = *(bb__aliased_uint32_t*)(u32p); SWAP_LE32(v); }) /* ---- 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 */ #if (defined __digital__ && defined __unix__) /* old system without (proper) C99 support */ # define bool smalluint #else /* modern system, so use it */ # include #endif /*----- Kernel versioning ------------------------------------*/ #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c)) #ifdef __UCLIBC__ # define UCLIBC_VERSION KERNEL_VERSION(__UCLIBC_MAJOR__, __UCLIBC_MINOR__, __UCLIBC_SUBLEVEL__) #else # define UCLIBC_VERSION 0 #endif /* ---- Miscellaneous --------------------------------------- */ #if defined __GLIBC__ \ || defined __UCLIBC__ \ || defined __dietlibc__ \ || defined __BIONIC__ \ || defined _NEWLIB_VERSION # include #endif /* Define bb_setpgrp */ #if (defined(__digital__) && defined(__unix__)) || defined(__FreeBSD__) /* 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) #else # define bb_setpgrp() setpgrp() #endif /* fdprintf is more readable, we used it before dprintf was standardized */ #include #define fdprintf dprintf /* Useful for defeating gcc's alignment of "char message[]"-like data */ #if !defined(__s390__) /* on s390[x], non-word-aligned data accesses require larger code */ # define ALIGN1 __attribute__((aligned(1))) # define ALIGN2 __attribute__((aligned(2))) # define ALIGN4 __attribute__((aligned(4))) #else /* Arches which MUST have 2 or 4 byte alignment for everything are here */ # define ALIGN1 # define ALIGN2 # define ALIGN4 #endif #define ALIGN8 __attribute__((aligned(8))) #define ALIGN_PTR __attribute__((aligned(sizeof(void*)))) /* * 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_VERSION > KERNEL_VERSION(0, 9, 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 #if defined(__digital__) && defined(__unix__) # include # include # define PRIu32 "u" # 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 #endif #if defined(__CYGWIN__) # define MAXSYMLINKS SYMLOOP_MAX #endif #if defined(ANDROID) || defined(__ANDROID__) # define BB_ADDITIONAL_PATH ":/system/sbin:/system/bin:/system/xbin" # define SYS_ioprio_set __NR_ioprio_set # define SYS_ioprio_get __NR_ioprio_get #endif /* ---- Who misses what? ------------------------------------ */ /* Assume all these functions and header files exist by default. * Platforms where it is not true will #undef them below. */ #define HAVE_CLEARENV 1 #define HAVE_FDATASYNC 1 #define HAVE_DPRINTF 1 #define HAVE_MEMRCHR 1 #define HAVE_MKDTEMP 1 #define HAVE_TTYNAME_R 1 #define HAVE_PTSNAME_R 1 #define HAVE_SETBIT 1 #define HAVE_SIGHANDLER_T 1 #define HAVE_STPCPY 1 #define HAVE_STPNCPY 1 #define HAVE_MEMPCPY 1 #define HAVE_STRCASESTR 1 #define HAVE_STRCHRNUL 1 #define HAVE_STRSEP 1 #define HAVE_STRSIGNAL 1 #define HAVE_STRVERSCMP 1 #define HAVE_VASPRINTF 1 #define HAVE_USLEEP 1 #define HAVE_UNLOCKED_STDIO 1 #define HAVE_UNLOCKED_LINE_OPS 1 #define HAVE_GETLINE 1 #define HAVE_XTABS 1 #define HAVE_MNTENT_H 1 #define HAVE_NET_ETHERNET_H 1 #define HAVE_SYS_STATFS_H 1 #define HAVE_PRINTF_PERCENTM 1 #if defined(__UCLIBC__) # if UCLIBC_VERSION < KERNEL_VERSION(0, 9, 32) # undef HAVE_STRVERSCMP # endif # if UCLIBC_VERSION >= KERNEL_VERSION(0, 9, 30) # ifndef __UCLIBC_SUSV3_LEGACY__ # undef HAVE_USLEEP # endif # endif #endif #if defined(__WATCOMC__) # undef HAVE_DPRINTF # undef HAVE_GETLINE # undef HAVE_MEMRCHR # undef HAVE_MKDTEMP # undef HAVE_SETBIT # undef HAVE_STPCPY # undef HAVE_STPNCPY # undef HAVE_STRCASESTR # undef HAVE_STRCHRNUL # undef HAVE_STRSEP # undef HAVE_STRSIGNAL # undef HAVE_STRVERSCMP # undef HAVE_VASPRINTF # undef HAVE_UNLOCKED_STDIO # undef HAVE_UNLOCKED_LINE_OPS # undef HAVE_NET_ETHERNET_H #endif #if defined(__CYGWIN__) # undef HAVE_CLEARENV # undef HAVE_FDPRINTF # undef HAVE_MEMRCHR # undef HAVE_PTSNAME_R # undef HAVE_STRVERSCMP # undef HAVE_UNLOCKED_LINE_OPS #endif /* These BSD-derived OSes share many similarities */ #if (defined __digital__ && defined __unix__) \ || defined __APPLE__ \ || defined __OpenBSD__ || defined __NetBSD__ # undef HAVE_CLEARENV # undef HAVE_FDATASYNC # undef HAVE_GETLINE # undef HAVE_MNTENT_H # undef HAVE_PTSNAME_R # undef HAVE_SYS_STATFS_H # undef HAVE_SIGHANDLER_T # undef HAVE_STRVERSCMP # undef HAVE_XTABS # undef HAVE_DPRINTF # undef HAVE_UNLOCKED_STDIO # undef HAVE_UNLOCKED_LINE_OPS # undef HAVE_PRINTF_PERCENTM #endif #if defined(__dietlibc__) # undef HAVE_STRCHRNUL #endif #if defined(__APPLE__) # undef HAVE_STRCHRNUL #endif #if defined(__FreeBSD__) /* users say mempcpy is not present in FreeBSD 9.x */ # undef HAVE_MEMPCPY # undef HAVE_CLEARENV # undef HAVE_FDATASYNC # undef HAVE_MNTENT_H # undef HAVE_PTSNAME_R # undef HAVE_SYS_STATFS_H # undef HAVE_SIGHANDLER_T # undef HAVE_STRVERSCMP # undef HAVE_XTABS # undef HAVE_UNLOCKED_LINE_OPS # undef HAVE_PRINTF_PERCENTM # include # if __FreeBSD_version < 1000029 # undef HAVE_STRCHRNUL /* FreeBSD added strchrnul() between 1000028 and 1000029 */ # endif #endif #if defined(__NetBSD__) # define HAVE_GETLINE 1 /* Recent NetBSD versions have getline() */ #endif #if defined(__digital__) && defined(__unix__) # undef HAVE_STPCPY # undef HAVE_STPNCPY #endif #if defined(ANDROID) || defined(__ANDROID__) # if __ANDROID_API__ < 8 /* ANDROID < 8 has no [f]dprintf at all */ # undef HAVE_DPRINTF # elif __ANDROID_API__ < 21 /* ANDROID < 21 has fdprintf */ # define dprintf fdprintf # else /* ANDROID >= 21 has standard dprintf */ # endif # if __ANDROID_API__ < 21 # undef HAVE_TTYNAME_R # undef HAVE_GETLINE # undef HAVE_STPCPY # undef HAVE_STPNCPY # endif # undef HAVE_MEMPCPY # undef HAVE_STRCHRNUL # undef HAVE_STRVERSCMP # undef HAVE_UNLOCKED_LINE_OPS # undef HAVE_NET_ETHERNET_H # undef HAVE_PRINTF_PERCENTM #endif /* * Now, define prototypes for all the functions defined in platform.c * These must come after all the HAVE_* macros are defined (or not) */ #ifndef HAVE_DPRINTF extern int dprintf(int fd, const char *format, ...); #endif #ifndef HAVE_MEMRCHR extern void *memrchr(const void *s, int c, size_t n) FAST_FUNC; #endif #ifndef HAVE_MKDTEMP extern char *mkdtemp(char *template) FAST_FUNC; #endif #ifndef HAVE_TTYNAME_R #define ttyname_r bb_ttyname_r extern int ttyname_r(int fd, char *buf, size_t buflen); #endif #ifndef HAVE_SETBIT # define setbit(a, b) ((a)[(b) >> 3] |= 1 << ((b) & 7)) # define clrbit(a, b) ((a)[(b) >> 3] &= ~(1 << ((b) & 7))) #endif #ifndef HAVE_SIGHANDLER_T typedef void (*sighandler_t)(int); #endif #ifndef HAVE_STPCPY extern char *stpcpy(char *p, const char *to_add) FAST_FUNC; #endif #ifndef HAVE_STPNCPY extern char *stpncpy(char *p, const char *to_add, size_t n) FAST_FUNC; #endif #ifndef HAVE_MEMPCPY #include /* In case we are wrong about !HAVE_MEMPCPY, and toolchain _does_ have * mempcpy(), avoid colliding with it: */ #define mempcpy bb__mempcpy static ALWAYS_INLINE void *mempcpy(void *dest, const void *src, size_t len) { return memcpy(dest, src, len) + len; } #endif #ifndef HAVE_STRCASESTR extern char *strcasestr(const char *s, const char *pattern) FAST_FUNC; #endif #ifndef HAVE_STRCHRNUL extern char *strchrnul(const char *s, int c) FAST_FUNC; #endif #ifndef HAVE_STRSEP extern char *strsep(char **stringp, const char *delim) FAST_FUNC; #endif #ifndef HAVE_STRSIGNAL /* Not exactly the same: instead of "Stopped" it shows "STOP" etc */ # define strsignal(sig) get_signame(sig) #endif #ifndef HAVE_USLEEP extern int usleep(unsigned) FAST_FUNC; #endif #ifndef HAVE_VASPRINTF extern int vasprintf(char **string_ptr, const char *format, va_list p) FAST_FUNC; #endif #ifndef HAVE_GETLINE # include /* for FILE */ # include /* size_t */ extern ssize_t getline(char **lineptr, size_t *n, FILE *stream) FAST_FUNC; #endif #endif