1 /* vi: set sw=4 ts=4: */
3 * Copyright 2006, Bernhard Reutner-Fischer
5 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
8 #define BB_PLATFORM_H 1
10 /* Assume all these functions exist by default. Platforms where it is not
11 * true will #undef them below.
13 #define HAVE_FDPRINTF 1
14 #define HAVE_MEMRCHR 1
15 #define HAVE_MKDTEMP 1
17 #define HAVE_SIGHANDLER_T 1
18 #define HAVE_STRCASESTR 1
19 #define HAVE_STRCHRNUL 1
21 #define HAVE_STRSIGNAL 1
22 #define HAVE_VASPRINTF 1
24 /* Convenience macros to test the version of gcc. */
26 #if defined __GNUC__ && defined __GNUC_MINOR__
27 # define __GNUC_PREREQ(maj, min) \
28 ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
30 # define __GNUC_PREREQ(maj, min) 0
33 /* __restrict is known in EGCS 1.2 and above. */
34 #if !__GNUC_PREREQ(2,92)
40 /* Define macros for some gcc attributes. This permits us to use the
41 macros freely, and know that they will come into play for the
42 version of gcc in which they are supported. */
44 #if !__GNUC_PREREQ(2,7)
45 # ifndef __attribute__
46 # define __attribute__(x)
51 #if defined(__STDC_VERSION__) && __STDC_VERSION__ > 199901L
53 #elif __GNUC_PREREQ(2,7)
54 # define inline __inline__
60 # define __const const
63 #define UNUSED_PARAM __attribute__ ((__unused__))
64 #define NORETURN __attribute__ ((__noreturn__))
65 /* "The malloc attribute is used to tell the compiler that a function
66 * may be treated as if any non-NULL pointer it returns cannot alias
67 * any other pointer valid when the function returns. This will often
68 * improve optimization. Standard functions with this property include
69 * malloc and calloc. realloc-like functions have this property as long
70 * as the old pointer is never referred to (including comparing it
71 * to the new pointer) after the function returns a non-NULL value."
73 #define RETURNS_MALLOC __attribute__ ((malloc))
74 #define PACKED __attribute__ ((__packed__))
75 #define ALIGNED(m) __attribute__ ((__aligned__(m)))
77 /* __NO_INLINE__: some gcc's do not honor inlining! :( */
78 #if __GNUC_PREREQ(3,0) && !defined(__NO_INLINE__)
79 # define ALWAYS_INLINE __attribute__ ((always_inline)) inline
80 /* I've seen a toolchain where I needed __noinline__ instead of noinline */
81 # define NOINLINE __attribute__((__noinline__))
83 # define DEPRECATED __attribute__ ((__deprecated__))
84 # define UNUSED_PARAM_RESULT __attribute__ ((warn_unused_result))
87 # define UNUSED_PARAM_RESULT
90 # define ALWAYS_INLINE inline
93 # define UNUSED_PARAM_RESULT
96 /* -fwhole-program makes all symbols local. The attribute externally_visible
97 forces a symbol global. */
98 #if __GNUC_PREREQ(4,1)
99 # define EXTERNALLY_VISIBLE __attribute__(( visibility("default") ))
100 //__attribute__ ((__externally_visible__))
102 # define EXTERNALLY_VISIBLE
105 /* At 4.4 gcc become much more anal about this, need to use "aliased" types */
106 #if __GNUC_PREREQ(4,4)
107 # define FIX_ALIASING __attribute__((__may_alias__))
109 # define FIX_ALIASING
112 /* We use __extension__ in some places to suppress -pedantic warnings
113 about GCC extensions. This feature didn't work properly before
115 #if !__GNUC_PREREQ(2,8)
116 # ifndef __extension__
117 # define __extension__
121 /* gcc-2.95 had no va_copy but only __va_copy. */
122 #if !__GNUC_PREREQ(3,0)
124 # if !defined va_copy && defined __va_copy
125 # define va_copy(d,s) __va_copy((d),(s))
129 /* FAST_FUNC is a qualifier which (possibly) makes function call faster
130 * and/or smaller by using modified ABI. It is usually only needed
131 * on non-static, busybox internal functions. Recent versions of gcc
132 * optimize statics automatically. FAST_FUNC on static is required
133 * only if you need to match a function pointer's type */
134 #if __GNUC_PREREQ(3,0) && defined(i386) /* || defined(__x86_64__)? */
135 /* stdcall makes callee to pop arguments from stack, not caller */
136 # define FAST_FUNC __attribute__((regparm(3),stdcall))
137 /* #elif ... - add your favorite arch today! */
142 /* Make all declarations hidden (-fvisibility flag only affects definitions) */
143 /* (don't include system headers after this until corresponding pop!) */
144 #if __GNUC_PREREQ(4,1)
145 # define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN _Pragma("GCC visibility push(hidden)")
146 # define POP_SAVED_FUNCTION_VISIBILITY _Pragma("GCC visibility pop")
148 # define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
149 # define POP_SAVED_FUNCTION_VISIBILITY
152 /* ---- Endian Detection ------------------------------------ */
155 #if defined(__digital__) && defined(__unix__)
157 #elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) \
158 || defined(__APPLE__)
159 # include <sys/resource.h> /* rlimit */
160 # include <machine/endian.h>
161 # define bswap_64 __bswap64
162 # define bswap_32 __bswap32
163 # define bswap_16 __bswap16
165 # include <byteswap.h>
169 #if defined(__BYTE_ORDER) && __BYTE_ORDER == __BIG_ENDIAN
170 # define BB_BIG_ENDIAN 1
171 # define BB_LITTLE_ENDIAN 0
172 #elif defined(__BYTE_ORDER) && __BYTE_ORDER == __LITTLE_ENDIAN
173 # define BB_BIG_ENDIAN 0
174 # define BB_LITTLE_ENDIAN 1
175 #elif defined(_BYTE_ORDER) && _BYTE_ORDER == _BIG_ENDIAN
176 # define BB_BIG_ENDIAN 1
177 # define BB_LITTLE_ENDIAN 0
178 #elif defined(_BYTE_ORDER) && _BYTE_ORDER == _LITTLE_ENDIAN
179 # define BB_BIG_ENDIAN 0
180 # define BB_LITTLE_ENDIAN 1
181 #elif defined(BYTE_ORDER) && BYTE_ORDER == BIG_ENDIAN
182 # define BB_BIG_ENDIAN 1
183 # define BB_LITTLE_ENDIAN 0
184 #elif defined(BYTE_ORDER) && BYTE_ORDER == LITTLE_ENDIAN
185 # define BB_BIG_ENDIAN 0
186 # define BB_LITTLE_ENDIAN 1
187 #elif defined(__386__)
188 # define BB_BIG_ENDIAN 0
189 # define BB_LITTLE_ENDIAN 1
191 # error "Can't determine endianness"
194 #if ULONG_MAX > 0xffffffff
195 # define bb_bswap_64(x) bswap_64(x)
198 /* SWAP_LEnn means "convert CPU<->little_endian by swapping bytes" */
200 # define SWAP_BE16(x) (x)
201 # define SWAP_BE32(x) (x)
202 # define SWAP_BE64(x) (x)
203 # define SWAP_LE16(x) bswap_16(x)
204 # define SWAP_LE32(x) bswap_32(x)
205 # define SWAP_LE64(x) bb_bswap_64(x)
206 # define IF_BIG_ENDIAN(...) __VA_ARGS__
207 # define IF_LITTLE_ENDIAN(...)
209 # define SWAP_BE16(x) bswap_16(x)
210 # define SWAP_BE32(x) bswap_32(x)
211 # define SWAP_BE64(x) bb_bswap_64(x)
212 # define SWAP_LE16(x) (x)
213 # define SWAP_LE32(x) (x)
214 # define SWAP_LE64(x) (x)
215 # define IF_BIG_ENDIAN(...)
216 # define IF_LITTLE_ENDIAN(...) __VA_ARGS__
219 /* ---- Unaligned access ------------------------------------ */
221 /* NB: unaligned parameter should be a pointer, aligned one -
222 * a lvalue. This makes it more likely to not swap them by mistake
224 #if defined(i386) || defined(__x86_64__) || defined(__powerpc__)
226 typedef int bb__aliased_int FIX_ALIASING;
227 typedef uint16_t bb__aliased_uint16_t FIX_ALIASING;
228 typedef uint32_t bb__aliased_uint32_t FIX_ALIASING;
229 # define move_from_unaligned_int(v, intp) ((v) = *(bb__aliased_int*)(intp))
230 # define move_from_unaligned16(v, u16p) ((v) = *(bb__aliased_uint16_t*)(u16p))
231 # define move_from_unaligned32(v, u32p) ((v) = *(bb__aliased_uint32_t*)(u32p))
232 # define move_to_unaligned16(u16p, v) (*(bb__aliased_uint16_t*)(u16p) = (v))
233 # define move_to_unaligned32(u32p, v) (*(bb__aliased_uint32_t*)(u32p) = (v))
234 /* #elif ... - add your favorite arch today! */
236 /* performs reasonably well (gcc usually inlines memcpy here) */
237 # define move_from_unaligned_int(v, intp) (memcpy(&(v), (intp), sizeof(int)))
238 # define move_from_unaligned16(v, u16p) (memcpy(&(v), (u16p), 2))
239 # define move_from_unaligned32(v, u32p) (memcpy(&(v), (u32p), 4))
240 # define move_to_unaligned16(u16p, v) do { \
241 uint16_t __t = (v); \
242 memcpy((u16p), &__t, 4); \
244 # define move_to_unaligned32(u32p, v) do { \
245 uint32_t __t = (v); \
246 memcpy((u32p), &__t, 4); \
250 /* ---- Compiler dependent settings ------------------------- */
252 #if (defined __digital__ && defined __unix__) \
253 || defined __APPLE__ \
254 || defined __FreeBSD__ || defined __OpenBSD__ || defined __NetBSD__
255 # undef HAVE_MNTENT_H
256 # undef HAVE_SYS_STATFS_H
257 # undef HAVE_SIGHANDLER_T
259 # define HAVE_MNTENT_H 1
260 # define HAVE_SYS_STATFS_H 1
263 /*----- Kernel versioning ------------------------------------*/
265 #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
267 /* ---- Miscellaneous --------------------------------------- */
269 #if defined __GLIBC__ || defined __UCLIBC__ \
270 || defined __dietlibc__ || defined _NEWLIB_VERSION
271 # include <features.h>
274 /* Size-saving "small" ints (arch-dependent) */
275 #if defined(i386) || defined(__x86_64__) || defined(__mips__) || defined(__cris__)
276 /* add other arches which benefit from this... */
277 typedef signed char smallint;
278 typedef unsigned char smalluint;
280 /* for arches where byte accesses generate larger code: */
281 typedef int smallint;
282 typedef unsigned smalluint;
285 /* ISO C Standard: 7.16 Boolean type and values <stdbool.h> */
286 #if (defined __digital__ && defined __unix__)
287 /* old system without (proper) C99 support */
288 # define bool smalluint
290 /* modern system, so use it */
291 # include <stdbool.h>
294 /* Try to defeat gcc's alignment of "char message[]"-like data */
295 #if 1 /* if needed: !defined(arch1) && !defined(arch2) */
296 # define ALIGN1 __attribute__((aligned(1)))
297 # define ALIGN2 __attribute__((aligned(2)))
298 # define ALIGN4 __attribute__((aligned(4)))
300 /* Arches which MUST have 2 or 4 byte alignment for everything are here */
307 /* uclibc does not implement daemon() for no-mmu systems.
308 * For 0.9.29 and svn, __ARCH_USE_MMU__ indicates no-mmu reliably.
309 * For earlier versions there is no reliable way to check if we are building
310 * for a mmu-less system.
312 #if ENABLE_NOMMU || \
313 (defined __UCLIBC__ && __UCLIBC_MAJOR__ >= 0 && __UCLIBC_MINOR__ >= 9 && \
314 __UCLIBC_SUBLEVEL__ > 28 && !defined __ARCH_USE_MMU__)
316 # define USE_FOR_NOMMU(...) __VA_ARGS__
317 # define USE_FOR_MMU(...)
320 # define USE_FOR_NOMMU(...)
321 # define USE_FOR_MMU(...) __VA_ARGS__
324 /* Don't use lchown with glibc older than 2.1.x */
325 #if defined(__GLIBC__) && __GLIBC__ <= 2 && __GLIBC_MINOR__ < 1
326 # define lchown chown
329 #if defined(__digital__) && defined(__unix__)
331 # include <standards.h>
332 # include <inttypes.h>
334 /* use legacy setpgrp(pid_t,pid_t) for now. move to platform.c */
335 # define bb_setpgrp() do { pid_t __me = getpid(); setpgrp(__me, __me); } while (0)
336 # if !defined ADJ_OFFSET_SINGLESHOT && defined MOD_CLKA && defined MOD_OFFSET
337 # define ADJ_OFFSET_SINGLESHOT (MOD_CLKA | MOD_OFFSET)
339 # if !defined ADJ_FREQUENCY && defined MOD_FREQUENCY
340 # define ADJ_FREQUENCY MOD_FREQUENCY
342 # if !defined ADJ_TIMECONST && defined MOD_TIMECONST
343 # define ADJ_TIMECONST MOD_TIMECONST
345 # if !defined ADJ_TICK && defined MOD_CLKB
346 # define ADJ_TICK MOD_CLKB
351 # define bb_setpgrp() setpgrp()
355 #if defined(__GLIBC__)
356 # define fdprintf dprintf
359 #if defined(__dietlibc__)
360 # undef HAVE_STRCHRNUL
363 #if defined(__WATCOMC__)
364 # undef HAVE_FDPRINTF
368 # undef HAVE_STRCASESTR
369 # undef HAVE_STRCHRNUL
371 # undef HAVE_STRSIGNAL
372 # undef HAVE_VASPRINTF
375 #if defined(__FreeBSD__)
376 # undef HAVE_STRCHRNUL
380 * Now, define prototypes for all the functions defined in platform.c
381 * These must come after all the HAVE_* macros are defined (or not)
384 #ifndef HAVE_FDPRINTF
385 extern int fdprintf(int fd, const char *format, ...);
389 extern void *memrchr(const void *s, int c, size_t n) FAST_FUNC;
393 extern char *mkdtemp(char *template) FAST_FUNC;
397 # define setbit(a, b) ((a)[(b) >> 3] |= 1 << ((b) & 7))
398 # define clrbit(a, b) ((a)[(b) >> 3] &= ~(1 << ((b) & 7)))
401 #ifndef HAVE_SIGHANDLER_T
402 typedef void (*sighandler_t)(int);
405 #ifndef HAVE_STRCASESTR
406 extern char *strcasestr(const char *s, const char *pattern) FAST_FUNC;
409 #ifndef HAVE_STRCHRNUL
410 extern char *strchrnul(const char *s, int c) FAST_FUNC;
414 extern char *strsep(char **stringp, const char *delim) FAST_FUNC;
417 #ifndef HAVE_STRSIGNAL
418 /* Not exactly the same: instead of "Stopped" it shows "STOP" etc */
419 # define strsignal(sig) get_signame(sig)
422 #ifndef HAVE_VASPRINTF
423 extern int vasprintf(char **string_ptr, const char *format, va_list p) FAST_FUNC;