1 /* vi: set sw=4 ts=4: */
3 Copyright 2006, Bernhard Reutner-Fischer
5 Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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_STRCASESTR 1
18 #define HAVE_STRCHRNUL 1
19 #define HAVE_STRSIGNAL 1
20 #define HAVE_VASPRINTF 1
22 /* Convenience macros to test the version of gcc. */
24 #if defined __GNUC__ && defined __GNUC_MINOR__
25 # define __GNUC_PREREQ(maj, min) \
26 ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
28 # define __GNUC_PREREQ(maj, min) 0
31 /* __restrict is known in EGCS 1.2 and above. */
32 #if !__GNUC_PREREQ(2,92)
38 /* Define macros for some gcc attributes. This permits us to use the
39 macros freely, and know that they will come into play for the
40 version of gcc in which they are supported. */
42 #if !__GNUC_PREREQ(2,7)
43 # ifndef __attribute__
44 # define __attribute__(x)
49 #if defined(__STDC_VERSION__) && __STDC_VERSION__ > 199901L
51 #elif __GNUC_PREREQ(2,7)
52 # define inline __inline__
58 # define __const const
61 #define UNUSED_PARAM __attribute__ ((__unused__))
62 #define NORETURN __attribute__ ((__noreturn__))
63 /* "The malloc attribute is used to tell the compiler that a function
64 * may be treated as if any non-NULL pointer it returns cannot alias
65 * any other pointer valid when the function returns. This will often
66 * improve optimization. Standard functions with this property include
67 * malloc and calloc. realloc-like functions have this property as long
68 * as the old pointer is never referred to (including comparing it
69 * to the new pointer) after the function returns a non-NULL value."
71 #define RETURNS_MALLOC __attribute__ ((malloc))
72 #define PACKED __attribute__ ((__packed__))
73 #define ALIGNED(m) __attribute__ ((__aligned__(m)))
75 /* __NO_INLINE__: some gcc's do not honor inlining! :( */
76 #if __GNUC_PREREQ(3,0) && !defined(__NO_INLINE__)
77 # define ALWAYS_INLINE __attribute__ ((always_inline)) inline
78 /* I've seen a toolchain where I needed __noinline__ instead of noinline */
79 # define NOINLINE __attribute__((__noinline__))
81 # define DEPRECATED __attribute__ ((__deprecated__))
82 # define UNUSED_PARAM_RESULT __attribute__ ((warn_unused_result))
85 # define UNUSED_PARAM_RESULT
88 # define ALWAYS_INLINE inline
91 # define UNUSED_PARAM_RESULT
94 /* -fwhole-program makes all symbols local. The attribute externally_visible
95 forces a symbol global. */
96 #if __GNUC_PREREQ(4,1)
97 # define EXTERNALLY_VISIBLE __attribute__(( visibility("default") ))
98 //__attribute__ ((__externally_visible__))
100 # define EXTERNALLY_VISIBLE
103 /* At 4.4 gcc become much more anal about this, need to use "aliased" types */
104 #if __GNUC_PREREQ(4,4)
105 # define FIX_ALIASING __attribute__((__may_alias__))
107 # define FIX_ALIASING
110 /* We use __extension__ in some places to suppress -pedantic warnings
111 about GCC extensions. This feature didn't work properly before
113 #if !__GNUC_PREREQ(2,8)
114 # ifndef __extension__
115 # define __extension__
119 /* gcc-2.95 had no va_copy but only __va_copy. */
120 #if !__GNUC_PREREQ(3,0)
122 # if !defined va_copy && defined __va_copy
123 # define va_copy(d,s) __va_copy((d),(s))
127 /* FAST_FUNC is a qualifier which (possibly) makes function call faster
128 * and/or smaller by using modified ABI. It is usually only needed
129 * on non-static, busybox internal functions. Recent versions of gcc
130 * optimize statics automatically. FAST_FUNC on static is required
131 * only if you need to match a function pointer's type */
132 #if __GNUC_PREREQ(3,0) && defined(i386) /* || defined(__x86_64__)? */
133 /* stdcall makes callee to pop arguments from stack, not caller */
134 # define FAST_FUNC __attribute__((regparm(3),stdcall))
135 /* #elif ... - add your favorite arch today! */
140 /* Make all declarations hidden (-fvisibility flag only affects definitions) */
141 /* (don't include system headers after this until corresponding pop!) */
142 #if __GNUC_PREREQ(4,1)
143 # define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN _Pragma("GCC visibility push(hidden)")
144 # define POP_SAVED_FUNCTION_VISIBILITY _Pragma("GCC visibility pop")
146 # define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
147 # define POP_SAVED_FUNCTION_VISIBILITY
150 /* ---- Endian Detection ------------------------------------ */
152 #if defined(__digital__) && defined(__unix__)
154 # define __BIG_ENDIAN__ (BYTE_ORDER == BIG_ENDIAN)
155 # define __BYTE_ORDER BYTE_ORDER
156 #elif defined __FreeBSD__
157 # include <sys/resource.h> /* rlimit */
158 # include <machine/endian.h>
159 # define bswap_64 __bswap64
160 # define bswap_32 __bswap32
161 # define bswap_16 __bswap16
162 # define __BIG_ENDIAN__ (_BYTE_ORDER == _BIG_ENDIAN)
163 #elif !defined __APPLE__
164 # include <byteswap.h>
168 #if defined(__BIG_ENDIAN__) && __BIG_ENDIAN__
169 # define BB_BIG_ENDIAN 1
170 # define BB_LITTLE_ENDIAN 0
171 #elif __BYTE_ORDER == __BIG_ENDIAN
172 # define BB_BIG_ENDIAN 1
173 # define BB_LITTLE_ENDIAN 0
174 #elif __BYTE_ORDER == __LITTLE_ENDIAN
175 # define BB_BIG_ENDIAN 0
176 # define BB_LITTLE_ENDIAN 1
178 # error "Can't determine endianness"
181 /* SWAP_LEnn means "convert CPU<->little_endian by swapping bytes" */
183 # define SWAP_BE16(x) (x)
184 # define SWAP_BE32(x) (x)
185 # define SWAP_BE64(x) (x)
186 # define SWAP_LE16(x) bswap_16(x)
187 # define SWAP_LE32(x) bswap_32(x)
188 # define SWAP_LE64(x) bswap_64(x)
190 # define SWAP_BE16(x) bswap_16(x)
191 # define SWAP_BE32(x) bswap_32(x)
192 # define SWAP_BE64(x) bswap_64(x)
193 # define SWAP_LE16(x) (x)
194 # define SWAP_LE32(x) (x)
195 # define SWAP_LE64(x) (x)
198 /* ---- Unaligned access ------------------------------------ */
200 /* NB: unaligned parameter should be a pointer, aligned one -
201 * a lvalue. This makes it more likely to not swap them by mistake
203 #if defined(i386) || defined(__x86_64__) || defined(__powerpc__)
205 typedef int bb__aliased_int FIX_ALIASING;
206 typedef uint16_t bb__aliased_uint16_t FIX_ALIASING;
207 typedef uint32_t bb__aliased_uint32_t FIX_ALIASING;
208 # define move_from_unaligned_int(v, intp) ((v) = *(bb__aliased_int*)(intp))
209 # define move_from_unaligned16(v, u16p) ((v) = *(bb__aliased_uint16_t*)(u16p))
210 # define move_from_unaligned32(v, u32p) ((v) = *(bb__aliased_uint32_t*)(u32p))
211 # define move_to_unaligned16(u16p, v) (*(bb__aliased_uint16_t*)(u16p) = (v))
212 # define move_to_unaligned32(u32p, v) (*(bb__aliased_uint32_t*)(u32p) = (v))
213 /* #elif ... - add your favorite arch today! */
215 /* performs reasonably well (gcc usually inlines memcpy here) */
216 # define move_from_unaligned_int(v, intp) (memcpy(&(v), (intp), sizeof(int)))
217 # define move_from_unaligned16(v, u16p) (memcpy(&(v), (u16p), 2))
218 # define move_from_unaligned32(v, u32p) (memcpy(&(v), (u32p), 4))
219 # define move_to_unaligned16(u16p, v) do { \
220 uint16_t __t = (v); \
221 memcpy((u16p), &__t, 4); \
223 # define move_to_unaligned32(u32p, v) do { \
224 uint32_t __t = (v); \
225 memcpy((u32p), &__t, 4); \
229 /* ---- Compiler dependent settings ------------------------- */
231 #if (defined __digital__ && defined __unix__) \
232 || defined __APPLE__ || defined __FreeBSD__
233 # undef HAVE_MNTENT_H
234 # undef HAVE_SYS_STATFS_H
236 # define HAVE_MNTENT_H 1
237 # define HAVE_SYS_STATFS_H 1
240 /*----- Kernel versioning ------------------------------------*/
242 #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
244 /* ---- Miscellaneous --------------------------------------- */
246 #if defined(__GNU_LIBRARY__) && __GNU_LIBRARY__ < 5 && \
247 !defined(__dietlibc__) && \
248 !defined(_NEWLIB_VERSION) && \
249 !(defined __digital__ && defined __unix__)
250 # error "Sorry, this libc version is not supported :("
253 /* Don't perpetuate e2fsck crap into the headers. Clean up e2fsck instead. */
255 #if defined __GLIBC__ || defined __UCLIBC__ \
256 || defined __dietlibc__ || defined _NEWLIB_VERSION
257 # include <features.h>
260 /* Size-saving "small" ints (arch-dependent) */
261 #if defined(i386) || defined(__x86_64__) || defined(__mips__) || defined(__cris__)
262 /* add other arches which benefit from this... */
263 typedef signed char smallint;
264 typedef unsigned char smalluint;
266 /* for arches where byte accesses generate larger code: */
267 typedef int smallint;
268 typedef unsigned smalluint;
271 /* ISO C Standard: 7.16 Boolean type and values <stdbool.h> */
272 #if (defined __digital__ && defined __unix__)
273 /* old system without (proper) C99 support */
274 # define bool smalluint
276 /* modern system, so use it */
277 # include <stdbool.h>
280 /* Try to defeat gcc's alignment of "char message[]"-like data */
281 #if 1 /* if needed: !defined(arch1) && !defined(arch2) */
282 # define ALIGN1 __attribute__((aligned(1)))
283 # define ALIGN2 __attribute__((aligned(2)))
285 /* Arches which MUST have 2 or 4 byte alignment for everything are here */
291 /* uclibc does not implement daemon() for no-mmu systems.
292 * For 0.9.29 and svn, __ARCH_USE_MMU__ indicates no-mmu reliably.
293 * For earlier versions there is no reliable way to check if we are building
294 * for a mmu-less system.
296 #if ENABLE_NOMMU || \
297 (defined __UCLIBC__ && __UCLIBC_MAJOR__ >= 0 && __UCLIBC_MINOR__ >= 9 && \
298 __UCLIBC_SUBLEVEL__ > 28 && !defined __ARCH_USE_MMU__)
300 # define USE_FOR_NOMMU(...) __VA_ARGS__
301 # define USE_FOR_MMU(...)
304 # define USE_FOR_NOMMU(...)
305 # define USE_FOR_MMU(...) __VA_ARGS__
308 /* Don't use lchown with glibc older than 2.1.x */
309 #if defined(__GLIBC__) && __GLIBC__ <= 2 && __GLIBC_MINOR__ < 1
310 # define lchown chown
313 #if defined(__digital__) && defined(__unix__)
315 # include <standards.h>
316 # include <inttypes.h>
318 /* use legacy setpgrp(pid_t,pid_t) for now. move to platform.c */
319 # define bb_setpgrp() do { pid_t __me = getpid(); setpgrp(__me, __me); } while (0)
320 # if !defined ADJ_OFFSET_SINGLESHOT && defined MOD_CLKA && defined MOD_OFFSET
321 # define ADJ_OFFSET_SINGLESHOT (MOD_CLKA | MOD_OFFSET)
323 # if !defined ADJ_FREQUENCY && defined MOD_FREQUENCY
324 # define ADJ_FREQUENCY MOD_FREQUENCY
326 # if !defined ADJ_TIMECONST && defined MOD_TIMECONST
327 # define ADJ_TIMECONST MOD_TIMECONST
329 # if !defined ADJ_TICK && defined MOD_CLKB
330 # define ADJ_TICK MOD_CLKB
335 # define bb_setpgrp() setpgrp()
339 #if defined(__GLIBC__)
340 # define fdprintf dprintf
343 #if defined(__dietlibc__)
344 # undef HAVE_STRCHRNUL
347 #if defined(__WATCOMC__)
348 # undef HAVE_FDPRINTF
352 # undef HAVE_STRCASESTR
353 # undef HAVE_STRCHRNUL
354 # undef HAVE_STRSIGNAL
355 # undef HAVE_VASPRINTF
358 #if defined(__FreeBSD__)
359 # undef HAVE_STRCHRNUL
363 * Now, define prototypes for all the functions defined in platform.c
364 * These must come after all the HAVE_* macros are defined (or not)
367 #ifndef HAVE_FDPRINTF
368 extern int fdprintf(int fd, const char *format, ...);
372 extern void *memrchr(const void *s, int c, size_t n) FAST_FUNC;
376 extern char *mkdtemp(char *template) FAST_FUNC;
380 # define setbit(a, b) ((a)[(b) >> 3] |= 1 << ((b) & 7))
381 # define clrbit(a, b) ((a)[(b) >> 3] &= ~(1 << ((b) & 7)))
384 #ifndef HAVE_STRCASESTR
385 extern char *strcasestr(const char *s, const char *pattern) FAST_FUNC;
388 #ifndef HAVE_STRCHRNUL
389 extern char *strchrnul(const char *s, int c) FAST_FUNC;
392 #ifndef HAVE_STRSIGNAL
393 /* Not exactly the same: instead of "Stopped" it shows "STOP" etc */
394 # define strsignal(sig) get_signame(sig)
397 #ifndef HAVE_VASPRINTF
398 extern int vasprintf(char **string_ptr, const char *format, va_list p) FAST_FUNC;