source: branches/3.2/mindi-busybox/include/platform.h @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 5 years ago
  • Update mindi-busybox to 1.21.1
File size: 14.5 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Copyright 2006, Bernhard Reutner-Fischer
4 *
5 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
6 */
7#ifndef BB_PLATFORM_H
8#define BB_PLATFORM_H 1
9
10
11/* Convenience macros to test the version of gcc. */
12#undef __GNUC_PREREQ
13#if defined __GNUC__ && defined __GNUC_MINOR__
14# define __GNUC_PREREQ(maj, min) \
15        ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
16#else
17# define __GNUC_PREREQ(maj, min) 0
18#endif
19
20/* __restrict is known in EGCS 1.2 and above. */
21#if !__GNUC_PREREQ(2,92)
22# ifndef __restrict
23#  define __restrict
24# endif
25#endif
26
27#if !__GNUC_PREREQ(2,7)
28# ifndef __attribute__
29#  define __attribute__(x)
30# endif
31#endif
32
33#undef inline
34#if defined(__STDC_VERSION__) && __STDC_VERSION__ > 199901L
35/* it's a keyword */
36#elif __GNUC_PREREQ(2,7)
37# define inline __inline__
38#else
39# define inline
40#endif
41
42#ifndef __const
43# define __const const
44#endif
45
46#define UNUSED_PARAM __attribute__ ((__unused__))
47#define NORETURN __attribute__ ((__noreturn__))
48/* "The malloc attribute is used to tell the compiler that a function
49 * may be treated as if any non-NULL pointer it returns cannot alias
50 * any other pointer valid when the function returns. This will often
51 * improve optimization. Standard functions with this property include
52 * malloc and calloc. realloc-like functions have this property as long
53 * as the old pointer is never referred to (including comparing it
54 * to the new pointer) after the function returns a non-NULL value."
55 */
56#define RETURNS_MALLOC __attribute__ ((malloc))
57#define PACKED __attribute__ ((__packed__))
58#define ALIGNED(m) __attribute__ ((__aligned__(m)))
59
60/* __NO_INLINE__: some gcc's do not honor inlining! :( */
61#if __GNUC_PREREQ(3,0) && !defined(__NO_INLINE__)
62# define ALWAYS_INLINE __attribute__ ((always_inline)) inline
63/* I've seen a toolchain where I needed __noinline__ instead of noinline */
64# define NOINLINE      __attribute__((__noinline__))
65# if !ENABLE_WERROR
66#  define DEPRECATED __attribute__ ((__deprecated__))
67#  define UNUSED_PARAM_RESULT __attribute__ ((warn_unused_result))
68# else
69#  define DEPRECATED
70#  define UNUSED_PARAM_RESULT
71# endif
72#else
73# define ALWAYS_INLINE inline
74# define NOINLINE
75# define DEPRECATED
76# define UNUSED_PARAM_RESULT
77#endif
78
79/* -fwhole-program makes all symbols local. The attribute externally_visible
80 * forces a symbol global.  */
81#if __GNUC_PREREQ(4,1)
82# define EXTERNALLY_VISIBLE __attribute__(( visibility("default") ))
83//__attribute__ ((__externally_visible__))
84#else
85# define EXTERNALLY_VISIBLE
86#endif
87
88/* At 4.4 gcc become much more anal about this, need to use "aliased" types */
89#if __GNUC_PREREQ(4,4)
90# define FIX_ALIASING __attribute__((__may_alias__))
91#else
92# define FIX_ALIASING
93#endif
94
95/* We use __extension__ in some places to suppress -pedantic warnings
96 * about GCC extensions.  This feature didn't work properly before
97 * gcc 2.8.  */
98#if !__GNUC_PREREQ(2,8)
99# ifndef __extension__
100#  define __extension__
101# endif
102#endif
103
104/* FAST_FUNC is a qualifier which (possibly) makes function call faster
105 * and/or smaller by using modified ABI. It is usually only needed
106 * on non-static, busybox internal functions. Recent versions of gcc
107 * optimize statics automatically. FAST_FUNC on static is required
108 * only if you need to match a function pointer's type */
109#if __GNUC_PREREQ(3,0) && defined(i386) /* || defined(__x86_64__)? */
110/* stdcall makes callee to pop arguments from stack, not caller */
111# define FAST_FUNC __attribute__((regparm(3),stdcall))
112/* #elif ... - add your favorite arch today! */
113#else
114# define FAST_FUNC
115#endif
116
117/* Make all declarations hidden (-fvisibility flag only affects definitions) */
118/* (don't include system headers after this until corresponding pop!) */
119#if __GNUC_PREREQ(4,1) && !defined(__CYGWIN__)
120# define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN _Pragma("GCC visibility push(hidden)")
121# define POP_SAVED_FUNCTION_VISIBILITY              _Pragma("GCC visibility pop")
122#else
123# define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
124# define POP_SAVED_FUNCTION_VISIBILITY
125#endif
126
127/* gcc-2.95 had no va_copy but only __va_copy. */
128#if !__GNUC_PREREQ(3,0)
129# include <stdarg.h>
130# if !defined va_copy && defined __va_copy
131#  define va_copy(d,s) __va_copy((d),(s))
132# endif
133#endif
134
135
136/* ---- Endian Detection ------------------------------------ */
137
138#include <limits.h>
139#if defined(__digital__) && defined(__unix__)
140# include <sex.h>
141#elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) \
142   || defined(__APPLE__)
143# include <sys/resource.h>  /* rlimit */
144# include <machine/endian.h>
145# define bswap_64 __bswap64
146# define bswap_32 __bswap32
147# define bswap_16 __bswap16
148#else
149# include <byteswap.h>
150# include <endian.h>
151#endif
152
153#if defined(__BYTE_ORDER) && __BYTE_ORDER == __BIG_ENDIAN
154# define BB_BIG_ENDIAN 1
155# define BB_LITTLE_ENDIAN 0
156#elif defined(__BYTE_ORDER) && __BYTE_ORDER == __LITTLE_ENDIAN
157# define BB_BIG_ENDIAN 0
158# define BB_LITTLE_ENDIAN 1
159#elif defined(_BYTE_ORDER) && _BYTE_ORDER == _BIG_ENDIAN
160# define BB_BIG_ENDIAN 1
161# define BB_LITTLE_ENDIAN 0
162#elif defined(_BYTE_ORDER) && _BYTE_ORDER == _LITTLE_ENDIAN
163# define BB_BIG_ENDIAN 0
164# define BB_LITTLE_ENDIAN 1
165#elif defined(BYTE_ORDER) && BYTE_ORDER == BIG_ENDIAN
166# define BB_BIG_ENDIAN 1
167# define BB_LITTLE_ENDIAN 0
168#elif defined(BYTE_ORDER) && BYTE_ORDER == LITTLE_ENDIAN
169# define BB_BIG_ENDIAN 0
170# define BB_LITTLE_ENDIAN 1
171#elif defined(__386__)
172# define BB_BIG_ENDIAN 0
173# define BB_LITTLE_ENDIAN 1
174#else
175# error "Can't determine endianness"
176#endif
177
178#if ULONG_MAX > 0xffffffff
179# define bb_bswap_64(x) bswap_64(x)
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) bb_bswap_64(x)
190# define IF_BIG_ENDIAN(...) __VA_ARGS__
191# define IF_LITTLE_ENDIAN(...)
192#else
193# define SWAP_BE16(x) bswap_16(x)
194# define SWAP_BE32(x) bswap_32(x)
195# define SWAP_BE64(x) bb_bswap_64(x)
196# define SWAP_LE16(x) (x)
197# define SWAP_LE32(x) (x)
198# define SWAP_LE64(x) (x)
199# define IF_BIG_ENDIAN(...)
200# define IF_LITTLE_ENDIAN(...) __VA_ARGS__
201#endif
202
203
204/* ---- Unaligned access ------------------------------------ */
205
206#include <stdint.h>
207typedef int      bb__aliased_int      FIX_ALIASING;
208typedef long     bb__aliased_long     FIX_ALIASING;
209typedef uint16_t bb__aliased_uint16_t FIX_ALIASING;
210typedef uint32_t bb__aliased_uint32_t FIX_ALIASING;
211
212/* NB: unaligned parameter should be a pointer, aligned one -
213 * a lvalue. This makes it more likely to not swap them by mistake
214 */
215#if defined(i386) || defined(__x86_64__) || defined(__powerpc__)
216# define move_from_unaligned_int(v, intp)  ((v) = *(bb__aliased_int*)(intp))
217# define move_from_unaligned_long(v, longp) ((v) = *(bb__aliased_long*)(longp))
218# define move_from_unaligned16(v, u16p) ((v) = *(bb__aliased_uint16_t*)(u16p))
219# define move_from_unaligned32(v, u32p) ((v) = *(bb__aliased_uint32_t*)(u32p))
220# define move_to_unaligned16(u16p, v)   (*(bb__aliased_uint16_t*)(u16p) = (v))
221# define move_to_unaligned32(u32p, v)   (*(bb__aliased_uint32_t*)(u32p) = (v))
222/* #elif ... - add your favorite arch today! */
223#else
224/* performs reasonably well (gcc usually inlines memcpy here) */
225# define move_from_unaligned_int(v, intp) (memcpy(&(v), (intp), sizeof(int)))
226# define move_from_unaligned_long(v, longp) (memcpy(&(v), (longp), sizeof(long)))
227# define move_from_unaligned16(v, u16p) (memcpy(&(v), (u16p), 2))
228# define move_from_unaligned32(v, u32p) (memcpy(&(v), (u32p), 4))
229# define move_to_unaligned16(u16p, v) do { \
230    uint16_t __t = (v); \
231    memcpy((u16p), &__t, 2); \
232} while (0)
233# define move_to_unaligned32(u32p, v) do { \
234    uint32_t __t = (v); \
235    memcpy((u32p), &__t, 4); \
236} while (0)
237#endif
238
239
240/* ---- Size-saving "small" ints (arch-dependent) ----------- */
241
242#if defined(i386) || defined(__x86_64__) || defined(__mips__) || defined(__cris__)
243/* add other arches which benefit from this... */
244typedef signed char smallint;
245typedef unsigned char smalluint;
246#else
247/* for arches where byte accesses generate larger code: */
248typedef int smallint;
249typedef unsigned smalluint;
250#endif
251
252/* ISO C Standard:  7.16  Boolean type and values  <stdbool.h> */
253#if (defined __digital__ && defined __unix__)
254/* old system without (proper) C99 support */
255# define bool smalluint
256#else
257/* modern system, so use it */
258# include <stdbool.h>
259#endif
260
261
262/*----- Kernel versioning ------------------------------------*/
263
264#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
265
266
267/* ---- Miscellaneous --------------------------------------- */
268
269#if defined __GLIBC__ \
270 || defined __UCLIBC__ \
271 || defined __dietlibc__ \
272 || defined __BIONIC__ \
273 || defined _NEWLIB_VERSION
274# include <features.h>
275#endif
276
277/* Define bb_setpgrp */
278#if defined(__digital__) && defined(__unix__)
279/* use legacy setpgrp(pid_t, pid_t) for now.  move to platform.c */
280# define bb_setpgrp() do { pid_t __me = getpid(); setpgrp(__me, __me); } while (0)
281#else
282# define bb_setpgrp() setpgrp()
283#endif
284
285/* fdprintf is more readable, we used it before dprintf was standardized */
286#include <unistd.h>
287#define fdprintf dprintf
288
289/* Useful for defeating gcc's alignment of "char message[]"-like data */
290#if !defined(__s390__)
291    /* on s390[x], non-word-aligned data accesses require larger code */
292# define ALIGN1 __attribute__((aligned(1)))
293# define ALIGN2 __attribute__((aligned(2)))
294# define ALIGN4 __attribute__((aligned(4)))
295#else
296/* Arches which MUST have 2 or 4 byte alignment for everything are here */
297# define ALIGN1
298# define ALIGN2
299# define ALIGN4
300#endif
301
302/*
303 * For 0.9.29 and svn, __ARCH_USE_MMU__ indicates no-mmu reliably.
304 * For earlier versions there is no reliable way to check if we are building
305 * for a mmu-less system.
306 */
307#if ENABLE_NOMMU || \
308    (defined __UCLIBC__ && __UCLIBC_MAJOR__ >= 0 && __UCLIBC_MINOR__ >= 9 && \
309    __UCLIBC_SUBLEVEL__ > 28 && !defined __ARCH_USE_MMU__)
310# define BB_MMU 0
311# define USE_FOR_NOMMU(...) __VA_ARGS__
312# define USE_FOR_MMU(...)
313#else
314# define BB_MMU 1
315# define USE_FOR_NOMMU(...)
316# define USE_FOR_MMU(...) __VA_ARGS__
317#endif
318
319#if defined(__digital__) && defined(__unix__)
320# include <standards.h>
321# include <inttypes.h>
322# define PRIu32 "u"
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#endif
336
337#if defined(__CYGWIN__)
338# define MAXSYMLINKS SYMLOOP_MAX
339#endif
340
341#if defined(ANDROID) || defined(__ANDROID__)
342# define BB_ADDITIONAL_PATH ":/system/sbin:/system/bin:/system/xbin"
343# define SYS_ioprio_set __NR_ioprio_set
344# define SYS_ioprio_get __NR_ioprio_get
345#endif
346
347
348/* ---- Who misses what? ------------------------------------ */
349
350/* Assume all these functions and header files exist by default.
351 * Platforms where it is not true will #undef them below.
352 */
353#define HAVE_CLEARENV 1
354#define HAVE_FDATASYNC 1
355#define HAVE_DPRINTF 1
356#define HAVE_MEMRCHR 1
357#define HAVE_MKDTEMP 1
358#define HAVE_PTSNAME_R 1
359#define HAVE_SETBIT 1
360#define HAVE_SIGHANDLER_T 1
361#define HAVE_STPCPY 1
362#define HAVE_STRCASESTR 1
363#define HAVE_STRCHRNUL 1
364#define HAVE_STRSEP 1
365#define HAVE_STRSIGNAL 1
366#define HAVE_STRVERSCMP 1
367#define HAVE_VASPRINTF 1
368#define HAVE_UNLOCKED_STDIO 1
369#define HAVE_UNLOCKED_LINE_OPS 1
370#define HAVE_GETLINE 1
371#define HAVE_XTABS 1
372#define HAVE_MNTENT_H 1
373#define HAVE_NET_ETHERNET_H 1
374#define HAVE_SYS_STATFS_H 1
375
376#if defined(__UCLIBC_MAJOR__)
377# if __UCLIBC_MAJOR__ == 0 \
378  && (   __UCLIBC_MINOR__ < 9 \
379     || (__UCLIBC_MINOR__ == 9 && __UCLIBC_SUBLEVEL__ < 32) \
380     )
381#  undef HAVE_STRVERSCMP
382# endif
383#endif
384
385#if defined(__dietlibc__)
386# undef HAVE_STRCHRNUL
387#endif
388
389#if defined(__WATCOMC__)
390# undef HAVE_DPRINTF
391# undef HAVE_GETLINE
392# undef HAVE_MEMRCHR
393# undef HAVE_MKDTEMP
394# undef HAVE_SETBIT
395# undef HAVE_STPCPY
396# undef HAVE_STRCASESTR
397# undef HAVE_STRCHRNUL
398# undef HAVE_STRSEP
399# undef HAVE_STRSIGNAL
400# undef HAVE_STRVERSCMP
401# undef HAVE_VASPRINTF
402# undef HAVE_UNLOCKED_STDIO
403# undef HAVE_UNLOCKED_LINE_OPS
404# undef HAVE_NET_ETHERNET_H
405#endif
406
407#if defined(__CYGWIN__)
408# undef HAVE_CLEARENV
409# undef HAVE_FDPRINTF
410# undef HAVE_MEMRCHR
411# undef HAVE_PTSNAME_R
412# undef HAVE_STRVERSCMP
413# undef HAVE_UNLOCKED_LINE_OPS
414#endif
415
416/* These BSD-derived OSes share many similarities */
417#if (defined __digital__ && defined __unix__) \
418 || defined __APPLE__ \
419 || defined __FreeBSD__ || defined __OpenBSD__ || defined __NetBSD__
420# undef HAVE_CLEARENV
421# undef HAVE_FDATASYNC
422# undef HAVE_GETLINE
423# undef HAVE_MNTENT_H
424# undef HAVE_PTSNAME_R
425# undef HAVE_SYS_STATFS_H
426# undef HAVE_SIGHANDLER_T
427# undef HAVE_STRVERSCMP
428# undef HAVE_XTABS
429# undef HAVE_DPRINTF
430# undef HAVE_UNLOCKED_STDIO
431# undef HAVE_UNLOCKED_LINE_OPS
432#endif
433
434#if defined(__FreeBSD__)
435# undef HAVE_STRCHRNUL
436#endif
437
438#if defined(__NetBSD__)
439# define HAVE_GETLINE 1  /* Recent NetBSD versions have getline() */
440#endif
441
442#if defined(__digital__) && defined(__unix__)
443# undef HAVE_STPCPY
444#endif
445
446#if defined(ANDROID) || defined(__ANDROID__)
447# undef HAVE_DPRINTF
448# undef HAVE_GETLINE
449# undef HAVE_STPCPY
450# undef HAVE_STRCHRNUL
451# undef HAVE_STRVERSCMP
452# undef HAVE_UNLOCKED_LINE_OPS
453# undef HAVE_NET_ETHERNET_H
454#endif
455
456/*
457 * Now, define prototypes for all the functions defined in platform.c
458 * These must come after all the HAVE_* macros are defined (or not)
459 */
460
461#ifndef HAVE_DPRINTF
462extern int dprintf(int fd, const char *format, ...);
463#endif
464
465#ifndef HAVE_MEMRCHR
466extern void *memrchr(const void *s, int c, size_t n) FAST_FUNC;
467#endif
468
469#ifndef HAVE_MKDTEMP
470extern char *mkdtemp(char *template) FAST_FUNC;
471#endif
472
473#ifndef HAVE_SETBIT
474# define setbit(a, b)  ((a)[(b) >> 3] |= 1 << ((b) & 7))
475# define clrbit(a, b)  ((a)[(b) >> 3] &= ~(1 << ((b) & 7)))
476#endif
477
478#ifndef HAVE_SIGHANDLER_T
479typedef void (*sighandler_t)(int);
480#endif
481
482#ifndef HAVE_STPCPY
483extern char *stpcpy(char *p, const char *to_add) FAST_FUNC;
484#endif
485
486#ifndef HAVE_STRCASESTR
487extern char *strcasestr(const char *s, const char *pattern) FAST_FUNC;
488#endif
489
490#ifndef HAVE_STRCHRNUL
491extern char *strchrnul(const char *s, int c) FAST_FUNC;
492#endif
493
494#ifndef HAVE_STRSEP
495extern char *strsep(char **stringp, const char *delim) FAST_FUNC;
496#endif
497
498#ifndef HAVE_STRSIGNAL
499/* Not exactly the same: instead of "Stopped" it shows "STOP" etc */
500# define strsignal(sig) get_signame(sig)
501#endif
502
503#ifndef HAVE_VASPRINTF
504extern int vasprintf(char **string_ptr, const char *format, va_list p) FAST_FUNC;
505#endif
506
507#ifndef HAVE_GETLINE
508# include <stdio.h> /* for FILE */
509# include <sys/types.h> /* size_t */
510extern ssize_t getline(char **lineptr, size_t *n, FILE *stream) FAST_FUNC;
511#endif
512
513#endif
Note: See TracBrowser for help on using the repository browser.