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_STRCHRNUL 1
15 #define HAVE_VASPRINTF 1
17 /* Convenience macros to test the version of gcc. */
19 #if defined __GNUC__ && defined __GNUC_MINOR__
20 # define __GNUC_PREREQ(maj, min) \
21 ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
23 # define __GNUC_PREREQ(maj, min) 0
26 /* __restrict is known in EGCS 1.2 and above. */
27 #if !__GNUC_PREREQ(2,92)
33 /* Define macros for some gcc attributes. This permits us to use the
34 macros freely, and know that they will come into play for the
35 version of gcc in which they are supported. */
37 #if !__GNUC_PREREQ(2,7)
38 # ifndef __attribute__
39 # define __attribute__(x)
44 #if defined(__STDC_VERSION__) && __STDC_VERSION__ > 199901L
46 #elif __GNUC_PREREQ(2,7)
47 # define inline __inline__
53 # define __const const
56 #define UNUSED_PARAM __attribute__ ((__unused__))
57 #define NORETURN __attribute__ ((__noreturn__))
58 #define PACKED __attribute__ ((__packed__))
59 #define ALIGNED(m) __attribute__ ((__aligned__(m)))
61 /* __NO_INLINE__: some gcc's do not honor inlining! :( */
62 #if __GNUC_PREREQ(3,0) && !defined(__NO_INLINE__)
63 # define ALWAYS_INLINE __attribute__ ((always_inline)) inline
64 /* I've seen a toolchain where I needed __noinline__ instead of noinline */
65 # define NOINLINE __attribute__((__noinline__))
67 # define DEPRECATED __attribute__ ((__deprecated__))
68 # define UNUSED_PARAM_RESULT __attribute__ ((warn_unused_result))
71 # define UNUSED_PARAM_RESULT
74 # define ALWAYS_INLINE inline
77 # define UNUSED_PARAM_RESULT
80 /* -fwhole-program makes all symbols local. The attribute externally_visible
81 forces a symbol global. */
82 #if __GNUC_PREREQ(4,1)
83 # define EXTERNALLY_VISIBLE __attribute__(( visibility("default") ))
84 //__attribute__ ((__externally_visible__))
86 # define EXTERNALLY_VISIBLE
89 /* We use __extension__ in some places to suppress -pedantic warnings
90 about GCC extensions. This feature didn't work properly before
92 #if !__GNUC_PREREQ(2,8)
93 # ifndef __extension__
94 # define __extension__
98 /* gcc-2.95 had no va_copy but only __va_copy. */
99 #if !__GNUC_PREREQ(3,0)
101 # if !defined va_copy && defined __va_copy
102 # define va_copy(d,s) __va_copy((d),(s))
106 /* FAST_FUNC is a qualifier which (possibly) makes function call faster
107 * and/or smaller by using modified ABI. It is usually only needed
108 * on non-static, busybox internal functions. Recent versions of gcc
109 * optimize statics automatically. FAST_FUNC on static is required
110 * only if you need to match a function pointer's type */
111 #if __GNUC_PREREQ(3,0) && defined(i386) /* || defined(__x86_64__)? */
112 /* stdcall makes callee to pop arguments from stack, not caller */
113 # define FAST_FUNC __attribute__((regparm(3),stdcall))
114 /* #elif ... - add your favorite arch today! */
119 /* Make all declarations hidden (-fvisibility flag only affects definitions) */
120 /* (don't include system headers after this until corresponding pop!) */
121 #if __GNUC_PREREQ(4,1)
122 # define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN _Pragma("GCC visibility push(hidden)")
123 # define POP_SAVED_FUNCTION_VISIBILITY _Pragma("GCC visibility pop")
125 # define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
126 # define POP_SAVED_FUNCTION_VISIBILITY
129 /* ---- Endian Detection ------------------------------------ */
131 #if defined(__digital__) && defined(__unix__)
133 # define __BIG_ENDIAN__ (BYTE_ORDER == BIG_ENDIAN)
134 # define __BYTE_ORDER BYTE_ORDER
135 #elif defined __FreeBSD__
136 # include <sys/resource.h> /* rlimit */
137 # include <machine/endian.h>
138 # define bswap_64 __bswap64
139 # define bswap_32 __bswap32
140 # define bswap_16 __bswap16
141 # define __BIG_ENDIAN__ (_BYTE_ORDER == _BIG_ENDIAN)
142 #elif !defined __APPLE__
143 # include <byteswap.h>
147 #if defined(__BIG_ENDIAN__) && __BIG_ENDIAN__
148 # define BB_BIG_ENDIAN 1
149 # define BB_LITTLE_ENDIAN 0
150 #elif __BYTE_ORDER == __BIG_ENDIAN
151 # define BB_BIG_ENDIAN 1
152 # define BB_LITTLE_ENDIAN 0
153 #elif __BYTE_ORDER == __LITTLE_ENDIAN
154 # define BB_BIG_ENDIAN 0
155 # define BB_LITTLE_ENDIAN 1
157 # error "Can't determine endianness"
160 /* SWAP_LEnn means "convert CPU<->little_endian by swapping bytes" */
162 # define SWAP_BE16(x) (x)
163 # define SWAP_BE32(x) (x)
164 # define SWAP_BE64(x) (x)
165 # define SWAP_LE16(x) bswap_16(x)
166 # define SWAP_LE32(x) bswap_32(x)
167 # define SWAP_LE64(x) bswap_64(x)
169 # define SWAP_BE16(x) bswap_16(x)
170 # define SWAP_BE32(x) bswap_32(x)
171 # define SWAP_BE64(x) bswap_64(x)
172 # define SWAP_LE16(x) (x)
173 # define SWAP_LE32(x) (x)
174 # define SWAP_LE64(x) (x)
177 /* ---- Unaligned access ------------------------------------ */
179 /* NB: unaligned parameter should be a pointer, aligned one -
180 * a lvalue. This makes it more likely to not swap them by mistake
182 #if defined(i386) || defined(__x86_64__)
183 # define move_from_unaligned16(v, u16p) ((v) = *(uint16_t*)(u16p))
184 # define move_from_unaligned32(v, u32p) ((v) = *(uint32_t*)(u32p))
185 # define move_to_unaligned32(u32p, v) (*(uint32_t*)(u32p) = (v))
186 /* #elif ... - add your favorite arch today! */
188 /* performs reasonably well (gcc usually inlines memcpy here) */
189 # define move_from_unaligned16(v, u16p) (memcpy(&(v), (u16p), 2))
190 # define move_from_unaligned32(v, u32p) (memcpy(&(v), (u32p), 4))
191 # define move_to_unaligned32(u32p, v) do { \
192 uint32_t __t = (v); \
193 memcpy((u32p), &__t, 4); \
197 /* ---- Networking ------------------------------------------ */
200 # include <arpa/inet.h>
201 # if !defined(__socklen_t_defined) && !defined(_SOCKLEN_T_DECLARED)
202 typedef int socklen_t;
205 # include <netinet/in.h>
208 /* ---- Compiler dependent settings ------------------------- */
210 #if (defined __digital__ && defined __unix__) \
211 || defined __APPLE__ || defined __FreeBSD__
212 # undef HAVE_MNTENT_H
213 # undef HAVE_SYS_STATFS_H
215 # define HAVE_MNTENT_H 1
216 # define HAVE_SYS_STATFS_H 1
219 /*----- Kernel versioning ------------------------------------*/
221 #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
223 /* ---- Miscellaneous --------------------------------------- */
225 #if defined(__GNU_LIBRARY__) && __GNU_LIBRARY__ < 5 && \
226 !defined(__dietlibc__) && \
227 !defined(_NEWLIB_VERSION) && \
228 !(defined __digital__ && defined __unix__)
229 # error "Sorry, this libc version is not supported :("
232 /* Don't perpetuate e2fsck crap into the headers. Clean up e2fsck instead. */
234 #if defined __GLIBC__ || defined __UCLIBC__ \
235 || defined __dietlibc__ || defined _NEWLIB_VERSION
236 # include <features.h>
237 # define HAVE_FEATURES_H
239 # define HAVE_STDINT_H
240 #elif !defined __APPLE__
241 /* Largest integral types. */
244 typedef long intmax_t;
245 typedef unsigned long uintmax_t;
248 typedef long long intmax_t;
250 typedef unsigned long long uintmax_t;
254 /* Size-saving "small" ints (arch-dependent) */
255 #if defined(i386) || defined(__x86_64__) || defined(__mips__) || defined(__cris__)
256 /* add other arches which benefit from this... */
257 typedef signed char smallint;
258 typedef unsigned char smalluint;
260 /* for arches where byte accesses generate larger code: */
261 typedef int smallint;
262 typedef unsigned smalluint;
265 /* ISO C Standard: 7.16 Boolean type and values <stdbool.h> */
266 #if (defined __digital__ && defined __unix__)
267 /* old system without (proper) C99 support */
268 # define bool smalluint
270 /* modern system, so use it */
271 # include <stdbool.h>
274 /* Try to defeat gcc's alignment of "char message[]"-like data */
275 #if 1 /* if needed: !defined(arch1) && !defined(arch2) */
276 # define ALIGN1 __attribute__((aligned(1)))
277 # define ALIGN2 __attribute__((aligned(2)))
279 /* Arches which MUST have 2 or 4 byte alignment for everything are here */
285 /* uclibc does not implement daemon() for no-mmu systems.
286 * For 0.9.29 and svn, __ARCH_USE_MMU__ indicates no-mmu reliably.
287 * For earlier versions there is no reliable way to check if we are building
288 * for a mmu-less system.
290 #if ENABLE_NOMMU || \
291 (defined __UCLIBC__ && __UCLIBC_MAJOR__ >= 0 && __UCLIBC_MINOR__ >= 9 && \
292 __UCLIBC_SUBLEVEL__ > 28 && !defined __ARCH_USE_MMU__)
294 # define USE_FOR_NOMMU(...) __VA_ARGS__
295 # define USE_FOR_MMU(...)
298 # define USE_FOR_NOMMU(...)
299 # define USE_FOR_MMU(...) __VA_ARGS__
302 /* Don't use lchown with glibc older than 2.1.x */
303 #if defined(__GLIBC__) && __GLIBC__ <= 2 && __GLIBC_MINOR__ < 1
304 # define lchown chown
307 #if defined(__digital__) && defined(__unix__)
309 # include <standards.h>
310 # include <inttypes.h>
312 /* use legacy setpgrp(pid_t,pid_t) for now. move to platform.c */
313 # define bb_setpgrp() do { pid_t __me = getpid(); setpgrp(__me,__me); } while (0)
314 # if !defined ADJ_OFFSET_SINGLESHOT && defined MOD_CLKA && defined MOD_OFFSET
315 # define ADJ_OFFSET_SINGLESHOT (MOD_CLKA | MOD_OFFSET)
317 # if !defined ADJ_FREQUENCY && defined MOD_FREQUENCY
318 # define ADJ_FREQUENCY MOD_FREQUENCY
320 # if !defined ADJ_TIMECONST && defined MOD_TIMECONST
321 # define ADJ_TIMECONST MOD_TIMECONST
323 # if !defined ADJ_TICK && defined MOD_CLKB
324 # define ADJ_TICK MOD_CLKB
329 # define bb_setpgrp() setpgrp()
333 #if defined(__GLIBC__)
334 # define fdprintf dprintf
337 #if defined(__dietlibc__)
338 #undef HAVE_STRCHRNUL
341 #if defined(__WATCOMC__)
343 #undef HAVE_STRCHRNUL
344 #undef HAVE_VASPRINTF
347 #if defined(__FreeBSD__)
348 #undef HAVE_STRCHRNUL
352 * Now, define prototypes for all the functions defined in platform.c
353 * These must come after all the HAVE_* macros are defined (or not)
356 #ifndef HAVE_STRCHRNUL
357 extern char *strchrnul(const char *s, int c) FAST_FUNC;
360 #ifndef HAVE_VASPRINTF
361 extern int vasprintf(char **string_ptr, const char *format, va_list p) FAST_FUNC;
364 #ifndef HAVE_FDPRINTF
365 extern int fdprintf(int fd, const char *format, ...);