Annotation of /trunk/mkinitrd-magellan/busybox/include/platform.h
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Wed Aug 18 21:56:57 2010 UTC (13 years, 9 months ago) by niro
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Wed Aug 18 21:56:57 2010 UTC (13 years, 9 months ago) by niro
File MIME type: text/plain
File size: 12379 byte(s)
-updated to busybox-1.17.1
1 | niro | 532 | /* vi: set sw=4 ts=4: */ |
2 | /* | ||
3 | niro | 816 | Copyright 2006, Bernhard Reutner-Fischer |
4 | niro | 532 | |
5 | Licensed under the GPL v2 or later, see the file LICENSE in this tarball. | ||
6 | */ | ||
7 | niro | 984 | #ifndef BB_PLATFORM_H |
8 | #define BB_PLATFORM_H 1 | ||
9 | niro | 532 | |
10 | niro | 984 | /* 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 | niro | 1123 | #define HAVE_STRSEP 1 |
20 | niro | 984 | #define HAVE_STRSIGNAL 1 |
21 | #define HAVE_VASPRINTF 1 | ||
22 | |||
23 | niro | 532 | /* 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 | niro | 816 | #if !__GNUC_PREREQ(2,92) |
34 | niro | 532 | # ifndef __restrict |
35 | niro | 984 | # define __restrict |
36 | niro | 532 | # 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 | niro | 816 | #if !__GNUC_PREREQ(2,7) |
44 | niro | 532 | # 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 | niro | 984 | #elif __GNUC_PREREQ(2,7) |
53 | # define inline __inline__ | ||
54 | niro | 532 | #else |
55 | niro | 984 | # define inline |
56 | niro | 532 | #endif |
57 | |||
58 | #ifndef __const | ||
59 | # define __const const | ||
60 | #endif | ||
61 | |||
62 | niro | 816 | #define UNUSED_PARAM __attribute__ ((__unused__)) |
63 | #define NORETURN __attribute__ ((__noreturn__)) | ||
64 | niro | 984 | /* "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 | niro | 816 | #define PACKED __attribute__ ((__packed__)) |
74 | #define ALIGNED(m) __attribute__ ((__aligned__(m))) | ||
75 | niro | 984 | |
76 | niro | 816 | /* __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 | niro | 532 | # else |
85 | niro | 984 | # define DEPRECATED |
86 | # define UNUSED_PARAM_RESULT | ||
87 | niro | 532 | # endif |
88 | niro | 816 | #else |
89 | niro | 984 | # define ALWAYS_INLINE inline |
90 | # define NOINLINE | ||
91 | # define DEPRECATED | ||
92 | # define UNUSED_PARAM_RESULT | ||
93 | niro | 816 | #endif |
94 | niro | 532 | |
95 | /* -fwhole-program makes all symbols local. The attribute externally_visible | ||
96 | forces a symbol global. */ | ||
97 | niro | 816 | #if __GNUC_PREREQ(4,1) |
98 | # define EXTERNALLY_VISIBLE __attribute__(( visibility("default") )) | ||
99 | //__attribute__ ((__externally_visible__)) | ||
100 | #else | ||
101 | # define EXTERNALLY_VISIBLE | ||
102 | niro | 984 | #endif |
103 | niro | 532 | |
104 | niro | 1123 | /* 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 | niro | 532 | /* 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 | niro | 816 | #if !__GNUC_PREREQ(2,8) |
115 | niro | 532 | # ifndef __extension__ |
116 | # define __extension__ | ||
117 | # endif | ||
118 | #endif | ||
119 | |||
120 | /* gcc-2.95 had no va_copy but only __va_copy. */ | ||
121 | niro | 816 | #if !__GNUC_PREREQ(3,0) |
122 | niro | 532 | # 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 | niro | 816 | /* 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 | niro | 984 | /* 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 | niro | 532 | /* ---- Endian Detection ------------------------------------ */ |
152 | |||
153 | niro | 984 | #if defined(__digital__) && defined(__unix__) |
154 | niro | 532 | # include <sex.h> |
155 | # define __BIG_ENDIAN__ (BYTE_ORDER == BIG_ENDIAN) | ||
156 | # define __BYTE_ORDER BYTE_ORDER | ||
157 | niro | 984 | #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 | niro | 532 | #elif !defined __APPLE__ |
165 | # include <byteswap.h> | ||
166 | # include <endian.h> | ||
167 | #endif | ||
168 | |||
169 | niro | 984 | #if defined(__BIG_ENDIAN__) && __BIG_ENDIAN__ |
170 | niro | 532 | # define BB_BIG_ENDIAN 1 |
171 | # define BB_LITTLE_ENDIAN 0 | ||
172 | niro | 1123 | #elif defined(__BYTE_ORDER) && __BYTE_ORDER == __BIG_ENDIAN |
173 | niro | 532 | # define BB_BIG_ENDIAN 1 |
174 | # define BB_LITTLE_ENDIAN 0 | ||
175 | niro | 1123 | #elif (defined(__BYTE_ORDER) && __BYTE_ORDER == __LITTLE_ENDIAN) || defined(__386__) |
176 | niro | 532 | # define BB_BIG_ENDIAN 0 |
177 | # define BB_LITTLE_ENDIAN 1 | ||
178 | niro | 984 | #else |
179 | # error "Can't determine endianness" | ||
180 | niro | 532 | #endif |
181 | |||
182 | niro | 816 | /* SWAP_LEnn means "convert CPU<->little_endian by swapping bytes" */ |
183 | niro | 532 | #if BB_BIG_ENDIAN |
184 | niro | 984 | # 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 | niro | 532 | #else |
191 | niro | 984 | # 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 | niro | 532 | #endif |
198 | |||
199 | niro | 816 | /* ---- Unaligned access ------------------------------------ */ |
200 | |||
201 | niro | 984 | /* 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 | niro | 1123 | #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 | niro | 816 | /* #elif ... - add your favorite arch today! */ |
215 | #else | ||
216 | /* performs reasonably well (gcc usually inlines memcpy here) */ | ||
217 | niro | 984 | # 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 | niro | 1123 | # define move_to_unaligned16(u16p, v) do { \ |
221 | uint16_t __t = (v); \ | ||
222 | memcpy((u16p), &__t, 4); \ | ||
223 | } while (0) | ||
224 | niro | 984 | # define move_to_unaligned32(u32p, v) do { \ |
225 | uint32_t __t = (v); \ | ||
226 | memcpy((u32p), &__t, 4); \ | ||
227 | } while (0) | ||
228 | niro | 816 | #endif |
229 | |||
230 | /* ---- Compiler dependent settings ------------------------- */ | ||
231 | niro | 532 | |
232 | niro | 984 | #if (defined __digital__ && defined __unix__) \ |
233 | || defined __APPLE__ || defined __FreeBSD__ | ||
234 | niro | 532 | # undef HAVE_MNTENT_H |
235 | niro | 816 | # undef HAVE_SYS_STATFS_H |
236 | niro | 532 | #else |
237 | # define HAVE_MNTENT_H 1 | ||
238 | niro | 816 | # define HAVE_SYS_STATFS_H 1 |
239 | #endif | ||
240 | |||
241 | niro | 532 | /*----- Kernel versioning ------------------------------------*/ |
242 | niro | 816 | |
243 | niro | 532 | #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c)) |
244 | |||
245 | niro | 816 | /* ---- Miscellaneous --------------------------------------- */ |
246 | niro | 532 | |
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 | niro | 816 | /* Don't perpetuate e2fsck crap into the headers. Clean up e2fsck instead. */ |
255 | niro | 532 | |
256 | #if defined __GLIBC__ || defined __UCLIBC__ \ | ||
257 | niro | 984 | || defined __dietlibc__ || defined _NEWLIB_VERSION |
258 | # include <features.h> | ||
259 | niro | 532 | #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 | niro | 816 | /* 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 | niro | 984 | # define bool smalluint |
276 | niro | 816 | #else |
277 | /* modern system, so use it */ | ||
278 | niro | 984 | # include <stdbool.h> |
279 | niro | 816 | #endif |
280 | |||
281 | /* Try to defeat gcc's alignment of "char message[]"-like data */ | ||
282 | #if 1 /* if needed: !defined(arch1) && !defined(arch2) */ | ||
283 | niro | 984 | # define ALIGN1 __attribute__((aligned(1))) |
284 | # define ALIGN2 __attribute__((aligned(2))) | ||
285 | niro | 988 | # define ALIGN4 __attribute__((aligned(4))) |
286 | niro | 816 | #else |
287 | /* Arches which MUST have 2 or 4 byte alignment for everything are here */ | ||
288 | niro | 984 | # define ALIGN1 |
289 | # define ALIGN2 | ||
290 | niro | 988 | # define ALIGN4 |
291 | niro | 816 | #endif |
292 | |||
293 | |||
294 | niro | 532 | /* 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 | niro | 816 | * for a mmu-less system. |
298 | niro | 532 | */ |
299 | niro | 816 | #if ENABLE_NOMMU || \ |
300 | (defined __UCLIBC__ && __UCLIBC_MAJOR__ >= 0 && __UCLIBC_MINOR__ >= 9 && \ | ||
301 | __UCLIBC_SUBLEVEL__ > 28 && !defined __ARCH_USE_MMU__) | ||
302 | niro | 984 | # define BB_MMU 0 |
303 | # define USE_FOR_NOMMU(...) __VA_ARGS__ | ||
304 | # define USE_FOR_MMU(...) | ||
305 | niro | 816 | #else |
306 | niro | 984 | # define BB_MMU 1 |
307 | # define USE_FOR_NOMMU(...) | ||
308 | # define USE_FOR_MMU(...) __VA_ARGS__ | ||
309 | niro | 532 | #endif |
310 | |||
311 | niro | 984 | /* Don't use lchown with glibc older than 2.1.x */ |
312 | #if defined(__GLIBC__) && __GLIBC__ <= 2 && __GLIBC_MINOR__ < 1 | ||
313 | niro | 532 | # define lchown chown |
314 | #endif | ||
315 | |||
316 | niro | 984 | #if defined(__digital__) && defined(__unix__) |
317 | niro | 532 | |
318 | niro | 984 | # include <standards.h> |
319 | # include <inttypes.h> | ||
320 | # define PRIu32 "u" | ||
321 | niro | 816 | /* use legacy setpgrp(pid_t,pid_t) for now. move to platform.c */ |
322 | niro | 984 | # 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 | niro | 532 | |
336 | niro | 984 | #else |
337 | |||
338 | # define bb_setpgrp() setpgrp() | ||
339 | |||
340 | niro | 532 | #endif |
341 | niro | 984 | |
342 | #if defined(__GLIBC__) | ||
343 | # define fdprintf dprintf | ||
344 | niro | 532 | #endif |
345 | niro | 984 | |
346 | #if defined(__dietlibc__) | ||
347 | # undef HAVE_STRCHRNUL | ||
348 | niro | 532 | #endif |
349 | niro | 984 | |
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 | niro | 1123 | # undef HAVE_STRSEP |
358 | niro | 984 | # undef HAVE_STRSIGNAL |
359 | # undef HAVE_VASPRINTF | ||
360 | niro | 532 | #endif |
361 | |||
362 | niro | 984 | #if defined(__FreeBSD__) |
363 | # undef HAVE_STRCHRNUL | ||
364 | niro | 532 | #endif |
365 | |||
366 | niro | 984 | /* |
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 | niro | 532 | #endif |
374 | niro | 984 | |
375 | #ifndef HAVE_MEMRCHR | ||
376 | extern void *memrchr(const void *s, int c, size_t n) FAST_FUNC; | ||
377 | niro | 532 | #endif |
378 | niro | 984 | |
379 | #ifndef HAVE_MKDTEMP | ||
380 | extern char *mkdtemp(char *template) FAST_FUNC; | ||
381 | niro | 532 | #endif |
382 | niro | 984 | |
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 | niro | 532 | #endif |
387 | |||
388 | niro | 984 | #ifndef HAVE_STRCASESTR |
389 | extern char *strcasestr(const char *s, const char *pattern) FAST_FUNC; | ||
390 | niro | 532 | #endif |
391 | niro | 984 | |
392 | #ifndef HAVE_STRCHRNUL | ||
393 | extern char *strchrnul(const char *s, int c) FAST_FUNC; | ||
394 | niro | 532 | #endif |
395 | niro | 984 | |
396 | niro | 1123 | #ifndef HAVE_STRSEP |
397 | extern char *strsep(char **stringp, const char *delim) FAST_FUNC; | ||
398 | #endif | ||
399 | |||
400 | niro | 984 | #ifndef HAVE_STRSIGNAL |
401 | /* Not exactly the same: instead of "Stopped" it shows "STOP" etc */ | ||
402 | # define strsignal(sig) get_signame(sig) | ||
403 | niro | 532 | #endif |
404 | niro | 984 | |
405 | #ifndef HAVE_VASPRINTF | ||
406 | extern int vasprintf(char **string_ptr, const char *format, va_list p) FAST_FUNC; | ||
407 | niro | 532 | #endif |
408 | |||
409 | #endif |