Contents of /tags/mkinitrd-6_1_3/busybox/include/platform.h
Parent Directory | Revision Log
Revision 846 -
(show annotations)
(download)
Mon May 4 18:51:23 2009 UTC (15 years, 4 months ago) by niro
File MIME type: text/plain
File size: 10321 byte(s)
Mon May 4 18:51:23 2009 UTC (15 years, 4 months ago) by niro
File MIME type: text/plain
File size: 10321 byte(s)
tagged 'mkinitrd-6_1_3'
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 __PLATFORM_H |
8 | #define __PLATFORM_H 1 |
9 | |
10 | /* Convenience macros to test the version of gcc. */ |
11 | #undef __GNUC_PREREQ |
12 | #if defined __GNUC__ && defined __GNUC_MINOR__ |
13 | # define __GNUC_PREREQ(maj, min) \ |
14 | ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min)) |
15 | #else |
16 | # define __GNUC_PREREQ(maj, min) 0 |
17 | #endif |
18 | |
19 | /* __restrict is known in EGCS 1.2 and above. */ |
20 | #if !__GNUC_PREREQ(2,92) |
21 | # ifndef __restrict |
22 | # define __restrict /* Ignore */ |
23 | # endif |
24 | #endif |
25 | |
26 | /* Define macros for some gcc attributes. This permits us to use the |
27 | macros freely, and know that they will come into play for the |
28 | version of gcc in which they are supported. */ |
29 | |
30 | #if !__GNUC_PREREQ(2,7) |
31 | # ifndef __attribute__ |
32 | # define __attribute__(x) |
33 | # endif |
34 | #endif |
35 | |
36 | #undef inline |
37 | #if defined(__STDC_VERSION__) && __STDC_VERSION__ > 199901L |
38 | /* it's a keyword */ |
39 | #else |
40 | # if __GNUC_PREREQ(2,7) |
41 | # define inline __inline__ |
42 | # else |
43 | # define inline |
44 | # endif |
45 | #endif |
46 | |
47 | #ifndef __const |
48 | # define __const const |
49 | #endif |
50 | |
51 | #define UNUSED_PARAM __attribute__ ((__unused__)) |
52 | #define NORETURN __attribute__ ((__noreturn__)) |
53 | #define PACKED __attribute__ ((__packed__)) |
54 | #define ALIGNED(m) __attribute__ ((__aligned__(m))) |
55 | /* __NO_INLINE__: some gcc's do not honor inlining! :( */ |
56 | #if __GNUC_PREREQ(3,0) && !defined(__NO_INLINE__) |
57 | # define ALWAYS_INLINE __attribute__ ((always_inline)) inline |
58 | /* I've seen a toolchain where I needed __noinline__ instead of noinline */ |
59 | # define NOINLINE __attribute__((__noinline__)) |
60 | # if !ENABLE_WERROR |
61 | # define DEPRECATED __attribute__ ((__deprecated__)) |
62 | # define UNUSED_PARAM_RESULT __attribute__ ((warn_unused_result)) |
63 | # else |
64 | # define DEPRECATED /* n/a */ |
65 | # define UNUSED_PARAM_RESULT /* n/a */ |
66 | # endif |
67 | #else |
68 | # define ALWAYS_INLINE inline /* n/a */ |
69 | # define NOINLINE /* n/a */ |
70 | # define DEPRECATED /* n/a */ |
71 | # define UNUSED_PARAM_RESULT /* n/a */ |
72 | #endif |
73 | |
74 | /* -fwhole-program makes all symbols local. The attribute externally_visible |
75 | forces a symbol global. */ |
76 | #if __GNUC_PREREQ(4,1) |
77 | # define EXTERNALLY_VISIBLE __attribute__(( visibility("default") )) |
78 | //__attribute__ ((__externally_visible__)) |
79 | #else |
80 | # define EXTERNALLY_VISIBLE |
81 | #endif /* GNUC >= 4.1 */ |
82 | |
83 | /* We use __extension__ in some places to suppress -pedantic warnings |
84 | about GCC extensions. This feature didn't work properly before |
85 | gcc 2.8. */ |
86 | #if !__GNUC_PREREQ(2,8) |
87 | # ifndef __extension__ |
88 | # define __extension__ |
89 | # endif |
90 | #endif |
91 | |
92 | /* gcc-2.95 had no va_copy but only __va_copy. */ |
93 | #if !__GNUC_PREREQ(3,0) |
94 | # include <stdarg.h> |
95 | # if !defined va_copy && defined __va_copy |
96 | # define va_copy(d,s) __va_copy((d),(s)) |
97 | # endif |
98 | #endif |
99 | |
100 | /* FAST_FUNC is a qualifier which (possibly) makes function call faster |
101 | * and/or smaller by using modified ABI. It is usually only needed |
102 | * on non-static, busybox internal functions. Recent versions of gcc |
103 | * optimize statics automatically. FAST_FUNC on static is required |
104 | * only if you need to match a function pointer's type */ |
105 | #if __GNUC_PREREQ(3,0) && defined(i386) /* || defined(__x86_64__)? */ |
106 | /* stdcall makes callee to pop arguments from stack, not caller */ |
107 | # define FAST_FUNC __attribute__((regparm(3),stdcall)) |
108 | /* #elif ... - add your favorite arch today! */ |
109 | #else |
110 | # define FAST_FUNC |
111 | #endif |
112 | |
113 | /* ---- Endian Detection ------------------------------------ */ |
114 | |
115 | #if (defined __digital__ && defined __unix__) |
116 | # include <sex.h> |
117 | # define __BIG_ENDIAN__ (BYTE_ORDER == BIG_ENDIAN) |
118 | # define __BYTE_ORDER BYTE_ORDER |
119 | #elif !defined __APPLE__ |
120 | # include <byteswap.h> |
121 | # include <endian.h> |
122 | #endif |
123 | |
124 | #ifdef __BIG_ENDIAN__ |
125 | # define BB_BIG_ENDIAN 1 |
126 | # define BB_LITTLE_ENDIAN 0 |
127 | #elif __BYTE_ORDER == __BIG_ENDIAN |
128 | # define BB_BIG_ENDIAN 1 |
129 | # define BB_LITTLE_ENDIAN 0 |
130 | #else |
131 | # define BB_BIG_ENDIAN 0 |
132 | # define BB_LITTLE_ENDIAN 1 |
133 | #endif |
134 | |
135 | /* SWAP_LEnn means "convert CPU<->little_endian by swapping bytes" */ |
136 | #if BB_BIG_ENDIAN |
137 | #define SWAP_BE16(x) (x) |
138 | #define SWAP_BE32(x) (x) |
139 | #define SWAP_BE64(x) (x) |
140 | #define SWAP_LE16(x) bswap_16(x) |
141 | #define SWAP_LE32(x) bswap_32(x) |
142 | #define SWAP_LE64(x) bswap_64(x) |
143 | #else |
144 | #define SWAP_BE16(x) bswap_16(x) |
145 | #define SWAP_BE32(x) bswap_32(x) |
146 | #define SWAP_BE64(x) bswap_64(x) |
147 | #define SWAP_LE16(x) (x) |
148 | #define SWAP_LE32(x) (x) |
149 | #define SWAP_LE64(x) (x) |
150 | #endif |
151 | |
152 | /* ---- Unaligned access ------------------------------------ */ |
153 | |
154 | /* parameter is supposed to be an uint32_t* ptr */ |
155 | #if defined(i386) || defined(__x86_64__) |
156 | #define get_unaligned_u32p(u32p) (*(u32p)) |
157 | /* #elif ... - add your favorite arch today! */ |
158 | #else |
159 | /* performs reasonably well (gcc usually inlines memcpy here) */ |
160 | #define get_unaligned_u32p(u32p) ({ uint32_t __t; memcpy(&__t, (u32p), 4); __t; }) |
161 | #endif |
162 | |
163 | /* ---- Networking ------------------------------------------ */ |
164 | |
165 | #ifndef __APPLE__ |
166 | # include <arpa/inet.h> |
167 | # ifndef __socklen_t_defined |
168 | typedef int socklen_t; |
169 | # endif |
170 | #else |
171 | # include <netinet/in.h> |
172 | #endif |
173 | |
174 | /* ---- Compiler dependent settings ------------------------- */ |
175 | |
176 | #if (defined __digital__ && defined __unix__) || defined __APPLE__ |
177 | # undef HAVE_MNTENT_H |
178 | # undef HAVE_SYS_STATFS_H |
179 | #else |
180 | # define HAVE_MNTENT_H 1 |
181 | # define HAVE_SYS_STATFS_H 1 |
182 | #endif /* ___digital__ && __unix__ */ |
183 | |
184 | /* linux/loop.h relies on __u64. Make sure we have that as a proper type |
185 | * until userspace is widely fixed. */ |
186 | #if (defined __INTEL_COMPILER && !defined __GNUC__) || \ |
187 | (defined __GNUC__ && defined __STRICT_ANSI__) |
188 | __extension__ typedef __signed__ long long __s64; |
189 | __extension__ typedef unsigned long long __u64; |
190 | #endif |
191 | |
192 | /*----- Kernel versioning ------------------------------------*/ |
193 | |
194 | #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c)) |
195 | |
196 | /* ---- Miscellaneous --------------------------------------- */ |
197 | |
198 | #if defined(__GNU_LIBRARY__) && __GNU_LIBRARY__ < 5 && \ |
199 | !defined(__dietlibc__) && \ |
200 | !defined(_NEWLIB_VERSION) && \ |
201 | !(defined __digital__ && defined __unix__) |
202 | # error "Sorry, this libc version is not supported :(" |
203 | #endif |
204 | |
205 | /* Don't perpetuate e2fsck crap into the headers. Clean up e2fsck instead. */ |
206 | |
207 | #if defined __GLIBC__ || defined __UCLIBC__ \ |
208 | || defined __dietlibc__ || defined _NEWLIB_VERSION |
209 | #include <features.h> |
210 | #define HAVE_FEATURES_H |
211 | #include <stdint.h> |
212 | #define HAVE_STDINT_H |
213 | #elif !defined __APPLE__ |
214 | /* Largest integral types. */ |
215 | #if __BIG_ENDIAN__ |
216 | typedef long intmax_t; |
217 | typedef unsigned long uintmax_t; |
218 | #else |
219 | __extension__ |
220 | typedef long long intmax_t; |
221 | __extension__ |
222 | typedef unsigned long long uintmax_t; |
223 | #endif |
224 | #endif |
225 | |
226 | /* Size-saving "small" ints (arch-dependent) */ |
227 | #if defined(i386) || defined(__x86_64__) || defined(__mips__) || defined(__cris__) |
228 | /* add other arches which benefit from this... */ |
229 | typedef signed char smallint; |
230 | typedef unsigned char smalluint; |
231 | #else |
232 | /* for arches where byte accesses generate larger code: */ |
233 | typedef int smallint; |
234 | typedef unsigned smalluint; |
235 | #endif |
236 | |
237 | /* ISO C Standard: 7.16 Boolean type and values <stdbool.h> */ |
238 | #if (defined __digital__ && defined __unix__) |
239 | /* old system without (proper) C99 support */ |
240 | #define bool smalluint |
241 | #else |
242 | /* modern system, so use it */ |
243 | #include <stdbool.h> |
244 | #endif |
245 | |
246 | /* Try to defeat gcc's alignment of "char message[]"-like data */ |
247 | #if 1 /* if needed: !defined(arch1) && !defined(arch2) */ |
248 | #define ALIGN1 __attribute__((aligned(1))) |
249 | #define ALIGN2 __attribute__((aligned(2))) |
250 | #else |
251 | /* Arches which MUST have 2 or 4 byte alignment for everything are here */ |
252 | #define ALIGN1 |
253 | #define ALIGN2 |
254 | #endif |
255 | |
256 | |
257 | /* uclibc does not implement daemon() for no-mmu systems. |
258 | * For 0.9.29 and svn, __ARCH_USE_MMU__ indicates no-mmu reliably. |
259 | * For earlier versions there is no reliable way to check if we are building |
260 | * for a mmu-less system. |
261 | */ |
262 | #if ENABLE_NOMMU || \ |
263 | (defined __UCLIBC__ && __UCLIBC_MAJOR__ >= 0 && __UCLIBC_MINOR__ >= 9 && \ |
264 | __UCLIBC_SUBLEVEL__ > 28 && !defined __ARCH_USE_MMU__) |
265 | #define BB_MMU 0 |
266 | #define USE_FOR_NOMMU(...) __VA_ARGS__ |
267 | #define USE_FOR_MMU(...) |
268 | #else |
269 | #define BB_MMU 1 |
270 | #define USE_FOR_NOMMU(...) |
271 | #define USE_FOR_MMU(...) __VA_ARGS__ |
272 | #endif |
273 | |
274 | /* Platforms that haven't got dprintf need to implement fdprintf() in |
275 | * libbb. This would require a platform.c. It's not going to be cleaned |
276 | * out of the tree, so stop saying it should be. */ |
277 | #if !defined(__dietlibc__) |
278 | /* Needed for: glibc */ |
279 | /* Not needed for: dietlibc */ |
280 | /* Others: ?? (add as needed) */ |
281 | #define fdprintf dprintf |
282 | #endif |
283 | |
284 | #if defined(__dietlibc__) |
285 | static ALWAYS_INLINE char* strchrnul(const char *s, char c) |
286 | { |
287 | while (*s && *s != c) ++s; |
288 | return (char*)s; |
289 | } |
290 | #endif |
291 | |
292 | /* Don't use lchown with glibc older than 2.1.x ... uClibc lacks it */ |
293 | #if (defined __GLIBC__ && __GLIBC__ <= 2 && __GLIBC_MINOR__ < 1) || \ |
294 | defined __UC_LIBC__ |
295 | # define lchown chown |
296 | #endif |
297 | |
298 | #if (defined __digital__ && defined __unix__) |
299 | #include <standards.h> |
300 | #define HAVE_STANDARDS_H |
301 | #include <inttypes.h> |
302 | #define HAVE_INTTYPES_H |
303 | #define PRIu32 "u" |
304 | |
305 | /* use legacy setpgrp(pid_t,pid_t) for now. move to platform.c */ |
306 | #define bb_setpgrp() do { pid_t __me = getpid(); setpgrp(__me,__me); } while (0) |
307 | |
308 | #if !defined ADJ_OFFSET_SINGLESHOT && defined MOD_CLKA && defined MOD_OFFSET |
309 | #define ADJ_OFFSET_SINGLESHOT (MOD_CLKA | MOD_OFFSET) |
310 | #endif |
311 | #if !defined ADJ_FREQUENCY && defined MOD_FREQUENCY |
312 | #define ADJ_FREQUENCY MOD_FREQUENCY |
313 | #endif |
314 | #if !defined ADJ_TIMECONST && defined MOD_TIMECONST |
315 | #define ADJ_TIMECONST MOD_TIMECONST |
316 | #endif |
317 | #if !defined ADJ_TICK && defined MOD_CLKB |
318 | #define ADJ_TICK MOD_CLKB |
319 | #endif |
320 | |
321 | #else |
322 | #define bb_setpgrp() setpgrp() |
323 | #endif |
324 | |
325 | #if defined(__linux__) |
326 | #include <sys/mount.h> |
327 | /* Make sure we have all the new mount flags we actually try to use. */ |
328 | #ifndef MS_BIND |
329 | #define MS_BIND (1<<12) |
330 | #endif |
331 | #ifndef MS_MOVE |
332 | #define MS_MOVE (1<<13) |
333 | #endif |
334 | #ifndef MS_RECURSIVE |
335 | #define MS_RECURSIVE (1<<14) |
336 | #endif |
337 | #ifndef MS_SILENT |
338 | #define MS_SILENT (1<<15) |
339 | #endif |
340 | |
341 | /* The shared subtree stuff, which went in around 2.6.15. */ |
342 | #ifndef MS_UNBINDABLE |
343 | #define MS_UNBINDABLE (1<<17) |
344 | #endif |
345 | #ifndef MS_PRIVATE |
346 | #define MS_PRIVATE (1<<18) |
347 | #endif |
348 | #ifndef MS_SLAVE |
349 | #define MS_SLAVE (1<<19) |
350 | #endif |
351 | #ifndef MS_SHARED |
352 | #define MS_SHARED (1<<20) |
353 | #endif |
354 | #ifndef MS_RELATIME |
355 | #define MS_RELATIME (1 << 21) |
356 | #endif |
357 | |
358 | #if !defined(BLKSSZGET) |
359 | #define BLKSSZGET _IO(0x12, 104) |
360 | #endif |
361 | #if !defined(BLKGETSIZE64) |
362 | #define BLKGETSIZE64 _IOR(0x12,114,size_t) |
363 | #endif |
364 | #endif |
365 | |
366 | #endif /* platform.h */ |