aboutsummaryrefslogtreecommitdiff
path: root/include/platform.h
blob: bd11ad69af83f6fd8608d3d5a91a6093a7501e63 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
/* vi: set sw=4 ts=4: */
/*
 * Copyright 2006, Bernhard Reutner-Fischer
 *
 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 */
#ifndef BB_PLATFORM_H
#define BB_PLATFORM_H 1


/* Convenience macros to test the version of gcc. */
#undef __GNUC_PREREQ
#if defined __GNUC__ && defined __GNUC_MINOR__
# define __GNUC_PREREQ(maj, min) \
		((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
#else
# define __GNUC_PREREQ(maj, min) 0
#endif

/* __restrict is known in EGCS 1.2 and above. */
#if !__GNUC_PREREQ(2,92)
# ifndef __restrict
#  define __restrict
# endif
#endif

#if !__GNUC_PREREQ(2,7)
# ifndef __attribute__
#  define __attribute__(x)
# endif
#endif

#undef inline
#if defined(__STDC_VERSION__) && __STDC_VERSION__ > 199901L
/* it's a keyword */
#elif __GNUC_PREREQ(2,7)
# define inline __inline__
#else
# define inline
#endif

#ifndef __const
# define __const const
#endif

#define UNUSED_PARAM __attribute__ ((__unused__))
#define NORETURN __attribute__ ((__noreturn__))
/* "The malloc attribute is used to tell the compiler that a function
 * may be treated as if any non-NULL pointer it returns cannot alias
 * any other pointer valid when the function returns. This will often
 * improve optimization. Standard functions with this property include
 * malloc and calloc. realloc-like functions have this property as long
 * as the old pointer is never referred to (including comparing it
 * to the new pointer) after the function returns a non-NULL value."
 */
#define RETURNS_MALLOC __attribute__ ((malloc))
#define PACKED __attribute__ ((__packed__))
#define ALIGNED(m) __attribute__ ((__aligned__(m)))

/* __NO_INLINE__: some gcc's do not honor inlining! :( */
#if __GNUC_PREREQ(3,0) && !defined(__NO_INLINE__)
# define ALWAYS_INLINE __attribute__ ((always_inline)) inline
/* I've seen a toolchain where I needed __noinline__ instead of noinline */
# define NOINLINE      __attribute__((__noinline__))
# if !ENABLE_WERROR
#  define DEPRECATED __attribute__ ((__deprecated__))
#  define UNUSED_PARAM_RESULT __attribute__ ((warn_unused_result))
# else
#  define DEPRECATED
#  define UNUSED_PARAM_RESULT
# endif
#else
# define ALWAYS_INLINE inline
# define NOINLINE
# define DEPRECATED
# define UNUSED_PARAM_RESULT
#endif

/* -fwhole-program makes all symbols local. The attribute externally_visible
 * forces a symbol global.  */
#if __GNUC_PREREQ(4,1)
# define EXTERNALLY_VISIBLE __attribute__(( visibility("default") ))
//__attribute__ ((__externally_visible__))
#else
# define EXTERNALLY_VISIBLE
#endif

/* At 4.4 gcc become much more anal about this, need to use "aliased" types */
#if __GNUC_PREREQ(4,4)
# define FIX_ALIASING __attribute__((__may_alias__))
#else
# define FIX_ALIASING
#endif

/* We use __extension__ in some places to suppress -pedantic warnings
 * about GCC extensions.  This feature didn't work properly before
 * gcc 2.8.  */
#if !__GNUC_PREREQ(2,8)
# ifndef __extension__
#  define __extension__
# endif
#endif

/* FAST_FUNC is a qualifier which (possibly) makes function call faster
 * and/or smaller by using modified ABI. It is usually only needed
 * on non-static, busybox internal functions. Recent versions of gcc
 * optimize statics automatically. FAST_FUNC on static is required
 * only if you need to match a function pointer's type */
#if __GNUC_PREREQ(3,0) && defined(i386) /* || defined(__x86_64__)? */
/* stdcall makes callee to pop arguments from stack, not caller */
# define FAST_FUNC __attribute__((regparm(3),stdcall))
/* #elif ... - add your favorite arch today! */
#else
# define FAST_FUNC
#endif

/* Make all declarations hidden (-fvisibility flag only affects definitions) */
/* (don't include system headers after this until corresponding pop!) */
#if __GNUC_PREREQ(4,1) && !defined(__CYGWIN__)
# define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN _Pragma("GCC visibility push(hidden)")
# define POP_SAVED_FUNCTION_VISIBILITY              _Pragma("GCC visibility pop")
#else
# define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
# define POP_SAVED_FUNCTION_VISIBILITY
#endif

/* gcc-2.95 had no va_copy but only __va_copy. */
#if !__GNUC_PREREQ(3,0)
# include <stdarg.h>
# if !defined va_copy && defined __va_copy
#  define va_copy(d,s) __va_copy((d),(s))
# endif
#endif


/* ---- Endian Detection ------------------------------------ */

#include <limits.h>
#if defined(__digital__) && defined(__unix__)
# include <sex.h>
#elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) \
   || defined(__APPLE__)
# include <sys/resource.h>  /* rlimit */
# include <machine/endian.h>
# define bswap_64 __bswap64
# define bswap_32 __bswap32
# define bswap_16 __bswap16
#else
# include <byteswap.h>
# include <endian.h>
#endif

#if defined(__BYTE_ORDER) && __BYTE_ORDER == __BIG_ENDIAN
# define BB_BIG_ENDIAN 1
# define BB_LITTLE_ENDIAN 0
#elif defined(__BYTE_ORDER) && __BYTE_ORDER == __LITTLE_ENDIAN
# define BB_BIG_ENDIAN 0
# define BB_LITTLE_ENDIAN 1
#elif defined(_BYTE_ORDER) && _BYTE_ORDER == _BIG_ENDIAN
# define BB_BIG_ENDIAN 1
# define BB_LITTLE_ENDIAN 0
#elif defined(_BYTE_ORDER) && _BYTE_ORDER == _LITTLE_ENDIAN
# define BB_BIG_ENDIAN 0
# define BB_LITTLE_ENDIAN 1
#elif defined(BYTE_ORDER) && BYTE_ORDER == BIG_ENDIAN
# define BB_BIG_ENDIAN 1
# define BB_LITTLE_ENDIAN 0
#elif defined(BYTE_ORDER) && BYTE_ORDER == LITTLE_ENDIAN
# define BB_BIG_ENDIAN 0
# define BB_LITTLE_ENDIAN 1
#elif defined(__386__)
# define BB_BIG_ENDIAN 0
# define BB_LITTLE_ENDIAN 1
#else
# error "Can't determine endianness"
#endif

#if ULONG_MAX > 0xffffffff
# define bb_bswap_64(x) bswap_64(x)
#endif

/* SWAP_LEnn means "convert CPU<->little_endian by swapping bytes" */
#if BB_BIG_ENDIAN
# define SWAP_BE16(x) (x)
# define SWAP_BE32(x) (x)
# define SWAP_BE64(x) (x)
# define SWAP_LE16(x) bswap_16(x)
# define SWAP_LE32(x) bswap_32(x)
# define SWAP_LE64(x) bb_bswap_64(x)
# define IF_BIG_ENDIAN(...) __VA_ARGS__
# define IF_LITTLE_ENDIAN(...)
#else
# define SWAP_BE16(x) bswap_16(x)
# define SWAP_BE32(x) bswap_32(x)
# define SWAP_BE64(x) bb_bswap_64(x)
# define SWAP_LE16(x) (x)
# define SWAP_LE32(x) (x)
# define SWAP_LE64(x) (x)
# define IF_BIG_ENDIAN(...)
# define IF_LITTLE_ENDIAN(...) __VA_ARGS__
#endif


/* ---- Unaligned access ------------------------------------ */

#include <stdint.h>
typedef int      bb__aliased_int      FIX_ALIASING;
typedef long     bb__aliased_long     FIX_ALIASING;
typedef uint16_t bb__aliased_uint16_t FIX_ALIASING;
typedef uint32_t bb__aliased_uint32_t FIX_ALIASING;
typedef uint64_t bb__aliased_uint64_t FIX_ALIASING;

/* NB: unaligned parameter should be a pointer, aligned one -
 * a lvalue. This makes it more likely to not swap them by mistake
 */
#if defined(i386) || defined(__x86_64__) || defined(__powerpc__)
# define move_from_unaligned_int(v, intp)  ((v) = *(bb__aliased_int*)(intp))
# define move_from_unaligned_long(v, longp) ((v) = *(bb__aliased_long*)(longp))
# define move_from_unaligned16(v, u16p) ((v) = *(bb__aliased_uint16_t*)(u16p))
# define move_from_unaligned32(v, u32p) ((v) = *(bb__aliased_uint32_t*)(u32p))
# define move_to_unaligned16(u16p, v)   (*(bb__aliased_uint16_t*)(u16p) = (v))
# define move_to_unaligned32(u32p, v)   (*(bb__aliased_uint32_t*)(u32p) = (v))
/* #elif ... - add your favorite arch today! */
#else
/* performs reasonably well (gcc usually inlines memcpy here) */
# define move_from_unaligned_int(v, intp) (memcpy(&(v), (intp), sizeof(int)))
# define move_from_unaligned_long(v, longp) (memcpy(&(v), (longp), sizeof(long)))
# define move_from_unaligned16(v, u16p) (memcpy(&(v), (u16p), 2))
# define move_from_unaligned32(v, u32p) (memcpy(&(v), (u32p), 4))
# define move_to_unaligned16(u16p, v) do { \
	uint16_t __t = (v); \
	memcpy((u16p), &__t, 2); \
} while (0)
# define move_to_unaligned32(u32p, v) do { \
	uint32_t __t = (v); \
	memcpy((u32p), &__t, 4); \
} while (0)
#endif


/* ---- Size-saving "small" ints (arch-dependent) ----------- */

#if defined(i386) || defined(__x86_64__) || defined(__mips__) || defined(__cris__)
/* add other arches which benefit from this... */
typedef signed char smallint;
typedef unsigned char smalluint;
#else
/* for arches where byte accesses generate larger code: */
typedef int smallint;
typedef unsigned smalluint;
#endif

/* ISO C Standard:  7.16  Boolean type and values  <stdbool.h> */
#if (defined __digital__ && defined __unix__)
/* old system without (proper) C99 support */
# define bool smalluint
#else
/* modern system, so use it */
# include <stdbool.h>
#endif


/*----- Kernel versioning ------------------------------------*/

#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))

#ifdef __UCLIBC__
# define UCLIBC_VERSION KERNEL_VERSION(__UCLIBC_MAJOR__, __UCLIBC_MINOR__, __UCLIBC_SUBLEVEL__)
#else
# define UCLIBC_VERSION 0
#endif


/* ---- Miscellaneous --------------------------------------- */

#if defined __GLIBC__ \
 || defined __UCLIBC__ \
 || defined __dietlibc__ \
 || defined __BIONIC__ \
 || defined _NEWLIB_VERSION
# include <features.h>
#endif

/* Define bb_setpgrp */
#if defined(__digital__) && defined(__unix__)
/* use legacy setpgrp(pid_t, pid_t) for now.  move to platform.c */
# define bb_setpgrp() do { pid_t __me = getpid(); setpgrp(__me, __me); } while (0)
#else
# define bb_setpgrp() setpgrp()
#endif

/* fdprintf is more readable, we used it before dprintf was standardized */
#include <unistd.h>
#define fdprintf dprintf

/* Useful for defeating gcc's alignment of "char message[]"-like data */
#if !defined(__s390__)
    /* on s390[x], non-word-aligned data accesses require larger code */
# define ALIGN1 __attribute__((aligned(1)))
# define ALIGN2 __attribute__((aligned(2)))
# define ALIGN4 __attribute__((aligned(4)))
#else
/* Arches which MUST have 2 or 4 byte alignment for everything are here */
# define ALIGN1
# define ALIGN2
# define ALIGN4
#endif

/*
 * For 0.9.29 and svn, __ARCH_USE_MMU__ indicates no-mmu reliably.
 * For earlier versions there is no reliable way to check if we are building
 * for a mmu-less system.
 */
#if ENABLE_NOMMU || \
    (defined __UCLIBC__ && \
     UCLIBC_VERSION > KERNEL_VERSION(0, 9, 28) && \
     !defined __ARCH_USE_MMU__)
# define BB_MMU 0
# define USE_FOR_NOMMU(...) __VA_ARGS__
# define USE_FOR_MMU(...)
#else
# define BB_MMU 1
# define USE_FOR_NOMMU(...)
# define USE_FOR_MMU(...) __VA_ARGS__
#endif

#if defined(__digital__) && defined(__unix__)
# include <standards.h>
# include <inttypes.h>
# define PRIu32 "u"
# if !defined ADJ_OFFSET_SINGLESHOT && defined MOD_CLKA && defined MOD_OFFSET
#  define ADJ_OFFSET_SINGLESHOT (MOD_CLKA | MOD_OFFSET)
# endif
# if !defined ADJ_FREQUENCY && defined MOD_FREQUENCY
#  define ADJ_FREQUENCY MOD_FREQUENCY
# endif
# if !defined ADJ_TIMECONST && defined MOD_TIMECONST
#  define ADJ_TIMECONST MOD_TIMECONST
# endif
# if !defined ADJ_TICK && defined MOD_CLKB
#  define ADJ_TICK MOD_CLKB
# endif
#endif

#if defined(__CYGWIN__)
# define MAXSYMLINKS SYMLOOP_MAX
#endif

#if defined(ANDROID) || defined(__ANDROID__)
# define BB_ADDITIONAL_PATH ":/system/sbin:/system/bin:/system/xbin"
# define SYS_ioprio_set __NR_ioprio_set
# define SYS_ioprio_get __NR_ioprio_get
#endif


/* ---- Who misses what? ------------------------------------ */

/* Assume all these functions and header files exist by default.
 * Platforms where it is not true will #undef them below.
 */
#define HAVE_CLEARENV 1
#define HAVE_FDATASYNC 1
#define HAVE_DPRINTF 1
#define HAVE_MEMRCHR 1
#define HAVE_MKDTEMP 1
#define HAVE_PTSNAME_R 1
#define HAVE_SETBIT 1
#define HAVE_SIGHANDLER_T 1
#define HAVE_STPCPY 1
#define HAVE_STRCASESTR 1
#define HAVE_STRCHRNUL 1
#define HAVE_STRSEP 1
#define HAVE_STRSIGNAL 1
#define HAVE_STRVERSCMP 1
#define HAVE_VASPRINTF 1
#define HAVE_UNLOCKED_STDIO 1
#define HAVE_UNLOCKED_LINE_OPS 1
#define HAVE_GETLINE 1
#define HAVE_XTABS 1
#define HAVE_MNTENT_H 1
#define HAVE_NET_ETHERNET_H 1
#define HAVE_SYS_STATFS_H 1

#if defined(__UCLIBC__) && UCLIBC_VERSION < KERNEL_VERSION(0, 9, 32)
# undef HAVE_STRVERSCMP
#endif

#if defined(__WATCOMC__)
# undef HAVE_DPRINTF
# undef HAVE_GETLINE
# undef HAVE_MEMRCHR
# undef HAVE_MKDTEMP
# undef HAVE_SETBIT
# undef HAVE_STPCPY
# undef HAVE_STRCASESTR
# undef HAVE_STRCHRNUL
# undef HAVE_STRSEP
# undef HAVE_STRSIGNAL
# undef HAVE_STRVERSCMP
# undef HAVE_VASPRINTF
# undef HAVE_UNLOCKED_STDIO
# undef HAVE_UNLOCKED_LINE_OPS
# undef HAVE_NET_ETHERNET_H
#endif

#if defined(__CYGWIN__)
# undef HAVE_CLEARENV
# undef HAVE_FDPRINTF
# undef HAVE_MEMRCHR
# undef HAVE_PTSNAME_R
# undef HAVE_STRVERSCMP
# undef HAVE_UNLOCKED_LINE_OPS
#endif

/* These BSD-derived OSes share many similarities */
#if (defined __digital__ && defined __unix__) \
 || defined __APPLE__ \
 || defined __OpenBSD__ || defined __NetBSD__
# undef HAVE_CLEARENV
# undef HAVE_FDATASYNC
# undef HAVE_GETLINE
# undef HAVE_MNTENT_H
# undef HAVE_PTSNAME_R
# undef HAVE_SYS_STATFS_H
# undef HAVE_SIGHANDLER_T
# undef HAVE_STRVERSCMP
# undef HAVE_XTABS
# undef HAVE_DPRINTF
# undef HAVE_UNLOCKED_STDIO
# undef HAVE_UNLOCKED_LINE_OPS
#endif

#if defined(__dietlibc__)
# undef HAVE_STRCHRNUL
#endif

#if defined(__APPLE__)
# undef HAVE_STRCHRNUL
#endif

#if defined(__FreeBSD__)
# undef HAVE_CLEARENV
# undef HAVE_FDATASYNC
# undef HAVE_MNTENT_H
# undef HAVE_PTSNAME_R
# undef HAVE_SYS_STATFS_H
# undef HAVE_SIGHANDLER_T
# undef HAVE_STRVERSCMP
# undef HAVE_XTABS
# undef HAVE_UNLOCKED_LINE_OPS
# include <osreldate.h>
# if __FreeBSD_version < 1000029
#  undef HAVE_STRCHRNUL /* FreeBSD added strchrnul() between 1000028 and 1000029 */
# endif
#endif

#if defined(__NetBSD__)
# define HAVE_GETLINE 1  /* Recent NetBSD versions have getline() */
#endif

#if defined(__digital__) && defined(__unix__)
# undef HAVE_STPCPY
#endif

#if defined(ANDROID) || defined(__ANDROID__)
# undef HAVE_DPRINTF
# undef HAVE_GETLINE
# undef HAVE_STPCPY
# undef HAVE_STRCHRNUL
# undef HAVE_STRVERSCMP
# undef HAVE_UNLOCKED_LINE_OPS
# undef HAVE_NET_ETHERNET_H
#endif

/*
 * Now, define prototypes for all the functions defined in platform.c
 * These must come after all the HAVE_* macros are defined (or not)
 */

#ifndef HAVE_DPRINTF
extern int dprintf(int fd, const char *format, ...);
#endif

#ifndef HAVE_MEMRCHR
extern void *memrchr(const void *s, int c, size_t n) FAST_FUNC;
#endif

#ifndef HAVE_MKDTEMP
extern char *mkdtemp(char *template) FAST_FUNC;
#endif

#ifndef HAVE_SETBIT
# define setbit(a, b)  ((a)[(b) >> 3] |= 1 << ((b) & 7))
# define clrbit(a, b)  ((a)[(b) >> 3] &= ~(1 << ((b) & 7)))
#endif

#ifndef HAVE_SIGHANDLER_T
typedef void (*sighandler_t)(int);
#endif

#ifndef HAVE_STPCPY
extern char *stpcpy(char *p, const char *to_add) FAST_FUNC;
#endif

#ifndef HAVE_STRCASESTR
extern char *strcasestr(const char *s, const char *pattern) FAST_FUNC;
#endif

#ifndef HAVE_STRCHRNUL
extern char *strchrnul(const char *s, int c) FAST_FUNC;
#endif

#ifndef HAVE_STRSEP
extern char *strsep(char **stringp, const char *delim) FAST_FUNC;
#endif

#ifndef HAVE_STRSIGNAL
/* Not exactly the same: instead of "Stopped" it shows "STOP" etc */
# define strsignal(sig) get_signame(sig)
#endif

#ifndef HAVE_VASPRINTF
extern int vasprintf(char **string_ptr, const char *format, va_list p) FAST_FUNC;
#endif

#ifndef HAVE_GETLINE
# include <stdio.h> /* for FILE */
# include <sys/types.h> /* size_t */
extern ssize_t getline(char **lineptr, size_t *n, FILE *stream) FAST_FUNC;
#endif

#endif