Contents of /trunk/mkinitrd-magellan/busybox/include/platform.h
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Wed Aug 18 21:56:57 2010 UTC (14 years, 1 month ago) by niro
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Wed Aug 18 21:56:57 2010 UTC (14 years, 1 month ago) by niro
File MIME type: text/plain
File size: 12379 byte(s)
-updated to busybox-1.17.1
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> |
206 | typedef int bb__aliased_int FIX_ALIASING; |
207 | typedef uint16_t bb__aliased_uint16_t FIX_ALIASING; |
208 | typedef 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... */ |
264 | typedef signed char smallint; |
265 | typedef unsigned char smalluint; |
266 | #else |
267 | /* for arches where byte accesses generate larger code: */ |
268 | typedef int smallint; |
269 | typedef 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 |
372 | extern int fdprintf(int fd, const char *format, ...); |
373 | #endif |
374 | |
375 | #ifndef HAVE_MEMRCHR |
376 | extern void *memrchr(const void *s, int c, size_t n) FAST_FUNC; |
377 | #endif |
378 | |
379 | #ifndef HAVE_MKDTEMP |
380 | extern 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 |
389 | extern char *strcasestr(const char *s, const char *pattern) FAST_FUNC; |
390 | #endif |
391 | |
392 | #ifndef HAVE_STRCHRNUL |
393 | extern char *strchrnul(const char *s, int c) FAST_FUNC; |
394 | #endif |
395 | |
396 | #ifndef HAVE_STRSEP |
397 | extern 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 |
406 | extern int vasprintf(char **string_ptr, const char *format, va_list p) FAST_FUNC; |
407 | #endif |
408 | |
409 | #endif |