1/* vi: set sw=4 ts=4: */ 2/* 3 Copyright 2006, Bernhard Reutner-Fischer 4 5 Licensed under the GPL v2 or later, see the file LICENSE in this tarball. 6*/ 7#ifndef BB_PLATFORM_H 8#define BB_PLATFORM_H 1 9 10/* Assume all these functions exist by default. Platforms where it is not 11 * true will #undef them below. 12 */ 13#define HAVE_FDPRINTF 1 14#define HAVE_MEMRCHR 1 15#define HAVE_MKDTEMP 1 16#define HAVE_SETBIT 1 17#define HAVE_STRCASESTR 1 18#define HAVE_STRCHRNUL 1 19#define HAVE_STRSEP 1 20#define HAVE_STRSIGNAL 1 21#define HAVE_VASPRINTF 1 22 23/* Convenience macros to test the version of gcc. */ 24#undef __GNUC_PREREQ 25#if defined __GNUC__ && defined __GNUC_MINOR__ 26# define __GNUC_PREREQ(maj, min) \ 27 ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min)) 28#else 29# define __GNUC_PREREQ(maj, min) 0 30#endif 31 32/* __restrict is known in EGCS 1.2 and above. */ 33#if !__GNUC_PREREQ(2,92) 34# ifndef __restrict 35# define __restrict 36# endif 37#endif 38 39/* Define macros for some gcc attributes. This permits us to use the 40 macros freely, and know that they will come into play for the 41 version of gcc in which they are supported. */ 42 43#if !__GNUC_PREREQ(2,7) 44# ifndef __attribute__ 45# define __attribute__(x) 46# endif 47#endif 48 49#undef inline 50#if defined(__STDC_VERSION__) && __STDC_VERSION__ > 199901L 51/* it's a keyword */ 52#elif __GNUC_PREREQ(2,7) 53# define inline __inline__ 54#else 55# define inline 56#endif 57 58#ifndef __const 59# define __const const 60#endif 61 62#define UNUSED_PARAM __attribute__ ((__unused__)) 63#define NORETURN __attribute__ ((__noreturn__)) 64/* "The malloc attribute is used to tell the compiler that a function 65 * may be treated as if any non-NULL pointer it returns cannot alias 66 * any other pointer valid when the function returns. This will often 67 * improve optimization. Standard functions with this property include 68 * malloc and calloc. realloc-like functions have this property as long 69 * as the old pointer is never referred to (including comparing it 70 * to the new pointer) after the function returns a non-NULL value." 71 */ 72#define RETURNS_MALLOC __attribute__ ((malloc)) 73#define PACKED __attribute__ ((__packed__)) 74#define ALIGNED(m) __attribute__ ((__aligned__(m))) 75 76/* __NO_INLINE__: some gcc's do not honor inlining! :( */ 77#if __GNUC_PREREQ(3,0) && !defined(__NO_INLINE__) 78# define ALWAYS_INLINE __attribute__ ((always_inline)) inline 79/* I've seen a toolchain where I needed __noinline__ instead of noinline */ 80# define NOINLINE __attribute__((__noinline__)) 81# if !ENABLE_WERROR 82# define DEPRECATED __attribute__ ((__deprecated__)) 83# define UNUSED_PARAM_RESULT __attribute__ ((warn_unused_result)) 84# else 85# define DEPRECATED 86# define UNUSED_PARAM_RESULT 87# endif 88#else 89# define ALWAYS_INLINE inline 90# define NOINLINE 91# define DEPRECATED 92# define UNUSED_PARAM_RESULT 93#endif 94 95/* -fwhole-program makes all symbols local. The attribute externally_visible 96 forces a symbol global. */ 97#if __GNUC_PREREQ(4,1) 98# define EXTERNALLY_VISIBLE __attribute__(( visibility("default") )) 99//__attribute__ ((__externally_visible__)) 100#else 101# define EXTERNALLY_VISIBLE 102#endif 103 104/* At 4.4 gcc become much more anal about this, need to use "aliased" types */ 105#if __GNUC_PREREQ(4,4) 106# define FIX_ALIASING __attribute__((__may_alias__)) 107#else 108# define FIX_ALIASING 109#endif 110 111/* We use __extension__ in some places to suppress -pedantic warnings 112 about GCC extensions. This feature didn't work properly before 113 gcc 2.8. */ 114#if !__GNUC_PREREQ(2,8) 115# ifndef __extension__ 116# define __extension__ 117# endif 118#endif 119 120/* gcc-2.95 had no va_copy but only __va_copy. */ 121#if !__GNUC_PREREQ(3,0) 122# include <stdarg.h> 123# if !defined va_copy && defined __va_copy 124# define va_copy(d,s) __va_copy((d),(s)) 125# endif 126#endif 127 128/* FAST_FUNC is a qualifier which (possibly) makes function call faster 129 * and/or smaller by using modified ABI. It is usually only needed 130 * on non-static, busybox internal functions. Recent versions of gcc 131 * optimize statics automatically. FAST_FUNC on static is required 132 * only if you need to match a function pointer's type */ 133#if __GNUC_PREREQ(3,0) && defined(i386) /* || defined(__x86_64__)? */ 134/* stdcall makes callee to pop arguments from stack, not caller */ 135# define FAST_FUNC __attribute__((regparm(3),stdcall)) 136/* #elif ... - add your favorite arch today! */ 137#else 138# define FAST_FUNC 139#endif 140 141/* Make all declarations hidden (-fvisibility flag only affects definitions) */ 142/* (don't include system headers after this until corresponding pop!) */ 143#if __GNUC_PREREQ(4,1) 144# define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN _Pragma("GCC visibility push(hidden)") 145# define POP_SAVED_FUNCTION_VISIBILITY _Pragma("GCC visibility pop") 146#else 147# define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN 148# define POP_SAVED_FUNCTION_VISIBILITY 149#endif 150 151/* ---- Endian Detection ------------------------------------ */ 152 153#if defined(__digital__) && defined(__unix__) 154# include <sex.h> 155# define __BIG_ENDIAN__ (BYTE_ORDER == BIG_ENDIAN) 156# define __BYTE_ORDER BYTE_ORDER 157#elif defined __FreeBSD__ 158# include <sys/resource.h> /* rlimit */ 159# include <machine/endian.h> 160# define bswap_64 __bswap64 161# define bswap_32 __bswap32 162# define bswap_16 __bswap16 163# define __BIG_ENDIAN__ (_BYTE_ORDER == _BIG_ENDIAN) 164#elif !defined __APPLE__ 165# include <byteswap.h> 166# include <endian.h> 167#endif 168 169#if defined(__BIG_ENDIAN__) && __BIG_ENDIAN__ 170# define BB_BIG_ENDIAN 1 171# define BB_LITTLE_ENDIAN 0 172#elif defined(__BYTE_ORDER) && __BYTE_ORDER == __BIG_ENDIAN 173# define BB_BIG_ENDIAN 1 174# define BB_LITTLE_ENDIAN 0 175#elif (defined(__BYTE_ORDER) && __BYTE_ORDER == __LITTLE_ENDIAN) || defined(__386__) 176# define BB_BIG_ENDIAN 0 177# define BB_LITTLE_ENDIAN 1 178#else 179# error "Can't determine endianness" 180#endif 181 182/* SWAP_LEnn means "convert CPU<->little_endian by swapping bytes" */ 183#if BB_BIG_ENDIAN 184# define SWAP_BE16(x) (x) 185# define SWAP_BE32(x) (x) 186# define SWAP_BE64(x) (x) 187# define SWAP_LE16(x) bswap_16(x) 188# define SWAP_LE32(x) bswap_32(x) 189# define SWAP_LE64(x) bswap_64(x) 190#else 191# define SWAP_BE16(x) bswap_16(x) 192# define SWAP_BE32(x) bswap_32(x) 193# define SWAP_BE64(x) bswap_64(x) 194# define SWAP_LE16(x) (x) 195# define SWAP_LE32(x) (x) 196# define SWAP_LE64(x) (x) 197#endif 198 199/* ---- Unaligned access ------------------------------------ */ 200 201/* NB: unaligned parameter should be a pointer, aligned one - 202 * a lvalue. This makes it more likely to not swap them by mistake 203 */ 204#if defined(i386) || defined(__x86_64__) || defined(__powerpc__) 205# include <stdint.h> 206typedef int bb__aliased_int FIX_ALIASING; 207typedef uint16_t bb__aliased_uint16_t FIX_ALIASING; 208typedef uint32_t bb__aliased_uint32_t FIX_ALIASING; 209# define move_from_unaligned_int(v, intp) ((v) = *(bb__aliased_int*)(intp)) 210# define move_from_unaligned16(v, u16p) ((v) = *(bb__aliased_uint16_t*)(u16p)) 211# define move_from_unaligned32(v, u32p) ((v) = *(bb__aliased_uint32_t*)(u32p)) 212# define move_to_unaligned16(u16p, v) (*(bb__aliased_uint16_t*)(u16p) = (v)) 213# define move_to_unaligned32(u32p, v) (*(bb__aliased_uint32_t*)(u32p) = (v)) 214/* #elif ... - add your favorite arch today! */ 215#else 216/* performs reasonably well (gcc usually inlines memcpy here) */ 217# define move_from_unaligned_int(v, intp) (memcpy(&(v), (intp), sizeof(int))) 218# define move_from_unaligned16(v, u16p) (memcpy(&(v), (u16p), 2)) 219# define move_from_unaligned32(v, u32p) (memcpy(&(v), (u32p), 4)) 220# define move_to_unaligned16(u16p, v) do { \ 221 uint16_t __t = (v); \ 222 memcpy((u16p), &__t, 4); \ 223} while (0) 224# define move_to_unaligned32(u32p, v) do { \ 225 uint32_t __t = (v); \ 226 memcpy((u32p), &__t, 4); \ 227} while (0) 228#endif 229 230/* ---- Compiler dependent settings ------------------------- */ 231 232#if (defined __digital__ && defined __unix__) \ 233 || defined __APPLE__ || defined __FreeBSD__ 234# undef HAVE_MNTENT_H 235# undef HAVE_SYS_STATFS_H 236#else 237# define HAVE_MNTENT_H 1 238# define HAVE_SYS_STATFS_H 1 239#endif 240 241/*----- Kernel versioning ------------------------------------*/ 242 243#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c)) 244 245/* ---- Miscellaneous --------------------------------------- */ 246 247#if defined(__GNU_LIBRARY__) && __GNU_LIBRARY__ < 5 && \ 248 !defined(__dietlibc__) && \ 249 !defined(_NEWLIB_VERSION) && \ 250 !(defined __digital__ && defined __unix__) 251# error "Sorry, this libc version is not supported :(" 252#endif 253 254/* Don't perpetuate e2fsck crap into the headers. Clean up e2fsck instead. */ 255 256#if defined __GLIBC__ || defined __UCLIBC__ \ 257 || defined __dietlibc__ || defined _NEWLIB_VERSION 258# include <features.h> 259#endif 260 261/* Size-saving "small" ints (arch-dependent) */ 262#if defined(i386) || defined(__x86_64__) || defined(__mips__) || defined(__cris__) 263/* add other arches which benefit from this... */ 264typedef signed char smallint; 265typedef unsigned char smalluint; 266#else 267/* for arches where byte accesses generate larger code: */ 268typedef int smallint; 269typedef unsigned smalluint; 270#endif 271 272/* ISO C Standard: 7.16 Boolean type and values <stdbool.h> */ 273#if (defined __digital__ && defined __unix__) 274/* old system without (proper) C99 support */ 275# define bool smalluint 276#else 277/* modern system, so use it */ 278# include <stdbool.h> 279#endif 280 281/* Try to defeat gcc's alignment of "char message[]"-like data */ 282#if 1 /* if needed: !defined(arch1) && !defined(arch2) */ 283# define ALIGN1 __attribute__((aligned(1))) 284# define ALIGN2 __attribute__((aligned(2))) 285# define ALIGN4 __attribute__((aligned(4))) 286#else 287/* Arches which MUST have 2 or 4 byte alignment for everything are here */ 288# define ALIGN1 289# define ALIGN2 290# define ALIGN4 291#endif 292 293 294/* uclibc does not implement daemon() for no-mmu systems. 295 * For 0.9.29 and svn, __ARCH_USE_MMU__ indicates no-mmu reliably. 296 * For earlier versions there is no reliable way to check if we are building 297 * for a mmu-less system. 298 */ 299#if ENABLE_NOMMU || \ 300 (defined __UCLIBC__ && __UCLIBC_MAJOR__ >= 0 && __UCLIBC_MINOR__ >= 9 && \ 301 __UCLIBC_SUBLEVEL__ > 28 && !defined __ARCH_USE_MMU__) 302# define BB_MMU 0 303# define USE_FOR_NOMMU(...) __VA_ARGS__ 304# define USE_FOR_MMU(...) 305#else 306# define BB_MMU 1 307# define USE_FOR_NOMMU(...) 308# define USE_FOR_MMU(...) __VA_ARGS__ 309#endif 310 311/* Don't use lchown with glibc older than 2.1.x */ 312#if defined(__GLIBC__) && __GLIBC__ <= 2 && __GLIBC_MINOR__ < 1 313# define lchown chown 314#endif 315 316#if defined(__digital__) && defined(__unix__) 317 318# include <standards.h> 319# include <inttypes.h> 320# define PRIu32 "u" 321/* use legacy setpgrp(pid_t,pid_t) for now. move to platform.c */ 322# define bb_setpgrp() do { pid_t __me = getpid(); setpgrp(__me, __me); } while (0) 323# if !defined ADJ_OFFSET_SINGLESHOT && defined MOD_CLKA && defined MOD_OFFSET 324# define ADJ_OFFSET_SINGLESHOT (MOD_CLKA | MOD_OFFSET) 325# endif 326# if !defined ADJ_FREQUENCY && defined MOD_FREQUENCY 327# define ADJ_FREQUENCY MOD_FREQUENCY 328# endif 329# if !defined ADJ_TIMECONST && defined MOD_TIMECONST 330# define ADJ_TIMECONST MOD_TIMECONST 331# endif 332# if !defined ADJ_TICK && defined MOD_CLKB 333# define ADJ_TICK MOD_CLKB 334# endif 335 336#else 337 338# define bb_setpgrp() setpgrp() 339 340#endif 341 342#if defined(__GLIBC__) 343# define fdprintf dprintf 344#endif 345 346#if defined(__dietlibc__) 347# undef HAVE_STRCHRNUL 348#endif 349 350#if defined(__WATCOMC__) 351# undef HAVE_FDPRINTF 352# undef HAVE_MEMRCHR 353# undef HAVE_MKDTEMP 354# undef HAVE_SETBIT 355# undef HAVE_STRCASESTR 356# undef HAVE_STRCHRNUL 357# undef HAVE_STRSEP 358# undef HAVE_STRSIGNAL 359# undef HAVE_VASPRINTF 360#endif 361 362#if defined(__FreeBSD__) 363# undef HAVE_STRCHRNUL 364#endif 365 366/* 367 * Now, define prototypes for all the functions defined in platform.c 368 * These must come after all the HAVE_* macros are defined (or not) 369 */ 370 371#ifndef HAVE_FDPRINTF 372extern int fdprintf(int fd, const char *format, ...); 373#endif 374 375#ifndef HAVE_MEMRCHR 376extern void *memrchr(const void *s, int c, size_t n) FAST_FUNC; 377#endif 378 379#ifndef HAVE_MKDTEMP 380extern char *mkdtemp(char *template) FAST_FUNC; 381#endif 382 383#ifndef HAVE_SETBIT 384# define setbit(a, b) ((a)[(b) >> 3] |= 1 << ((b) & 7)) 385# define clrbit(a, b) ((a)[(b) >> 3] &= ~(1 << ((b) & 7))) 386#endif 387 388#ifndef HAVE_STRCASESTR 389extern char *strcasestr(const char *s, const char *pattern) FAST_FUNC; 390#endif 391 392#ifndef HAVE_STRCHRNUL 393extern char *strchrnul(const char *s, int c) FAST_FUNC; 394#endif 395 396#ifndef HAVE_STRSEP 397extern char *strsep(char **stringp, const char *delim) FAST_FUNC; 398#endif 399 400#ifndef HAVE_STRSIGNAL 401/* Not exactly the same: instead of "Stopped" it shows "STOP" etc */ 402# define strsignal(sig) get_signame(sig) 403#endif 404 405#ifndef HAVE_VASPRINTF 406extern int vasprintf(char **string_ptr, const char *format, va_list p) FAST_FUNC; 407#endif 408 409#endif 410