source: branches/3.0/mindi-busybox/include/platform.h @ 3085

Last change on this file since 3085 was 3085, checked in by bruno, 5 years ago
  • Patches to render this mindi-busybox version compatible with RHEL3 at least, potentially all older Linux 2.4 based distros.
File size: 12.5 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/* Assume all these functions exist by default.  Platforms where it is not
11 * true will #undef them below.
12 */
13#define HAVE_FDPRINTF 1
14#define HAVE_MEMRCHR 1
15#define HAVE_MKDTEMP 1
16#define HAVE_SETBIT 1
17#define HAVE_STRCASESTR 1
18#define HAVE_STRCHRNUL 1
19#define HAVE_STRSEP 1
20#define HAVE_STRSIGNAL 1
21#define HAVE_VASPRINTF 1
22
23/* Convenience macros to test the version of gcc. */
24#undef __GNUC_PREREQ
25#if defined __GNUC__ && defined __GNUC_MINOR__
26# define __GNUC_PREREQ(maj, min) \
27        ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
28#else
29# define __GNUC_PREREQ(maj, min) 0
30#endif
31
32/* __restrict is known in EGCS 1.2 and above. */
33#if !__GNUC_PREREQ(2,92)
34# ifndef __restrict
35#  define __restrict
36# endif
37#endif
38
39/* Define macros for some gcc attributes.  This permits us to use the
40   macros freely, and know that they will come into play for the
41   version of gcc in which they are supported.  */
42
43#if !__GNUC_PREREQ(2,7)
44# ifndef __attribute__
45#  define __attribute__(x)
46# endif
47#endif
48
49#undef inline
50#if defined(__STDC_VERSION__) && __STDC_VERSION__ > 199901L
51/* it's a keyword */
52#elif __GNUC_PREREQ(2,7)
53# define inline __inline__
54#else
55# define inline
56#endif
57
58#ifndef __const
59# define __const const
60#endif
61
62#define UNUSED_PARAM __attribute__ ((__unused__))
63#define NORETURN __attribute__ ((__noreturn__))
64/* "The malloc attribute is used to tell the compiler that a function
65 * may be treated as if any non-NULL pointer it returns cannot alias
66 * any other pointer valid when the function returns. This will often
67 * improve optimization. Standard functions with this property include
68 * malloc and calloc. realloc-like functions have this property as long
69 * as the old pointer is never referred to (including comparing it
70 * to the new pointer) after the function returns a non-NULL value."
71 */
72#define RETURNS_MALLOC __attribute__ ((malloc))
73#define PACKED __attribute__ ((__packed__))
74#define ALIGNED(m) __attribute__ ((__aligned__(m)))
75
76/* __NO_INLINE__: some gcc's do not honor inlining! :( */
77#if __GNUC_PREREQ(3,0) && !defined(__NO_INLINE__)
78# define ALWAYS_INLINE __attribute__ ((always_inline)) inline
79/* I've seen a toolchain where I needed __noinline__ instead of noinline */
80# define NOINLINE      __attribute__((__noinline__))
81# if !ENABLE_WERROR
82#  define DEPRECATED __attribute__ ((__deprecated__))
83#  define UNUSED_PARAM_RESULT __attribute__ ((warn_unused_result))
84# else
85#  define DEPRECATED
86#  define UNUSED_PARAM_RESULT
87# endif
88#else
89# define ALWAYS_INLINE inline
90# define NOINLINE
91# define DEPRECATED
92# define UNUSED_PARAM_RESULT
93#endif
94
95/* -fwhole-program makes all symbols local. The attribute externally_visible
96   forces a symbol global.  */
97#if __GNUC_PREREQ(4,1)
98# define EXTERNALLY_VISIBLE __attribute__(( visibility("default") ))
99//__attribute__ ((__externally_visible__))
100#else
101# define EXTERNALLY_VISIBLE
102#endif
103
104/* At 4.4 gcc become much more anal about this, need to use "aliased" types */
105#if __GNUC_PREREQ(4,4)
106# define FIX_ALIASING __attribute__((__may_alias__))
107#else
108# define FIX_ALIASING
109#endif
110
111/* We use __extension__ in some places to suppress -pedantic warnings
112   about GCC extensions.  This feature didn't work properly before
113   gcc 2.8.  */
114#if !__GNUC_PREREQ(2,8)
115# ifndef __extension__
116#  define __extension__
117# endif
118#endif
119
120/* gcc-2.95 had no va_copy but only __va_copy. */
121#if !__GNUC_PREREQ(3,0)
122# include <stdarg.h>
123# if !defined va_copy && defined __va_copy
124#  define va_copy(d,s) __va_copy((d),(s))
125# endif
126#endif
127
128/* FAST_FUNC is a qualifier which (possibly) makes function call faster
129 * and/or smaller by using modified ABI. It is usually only needed
130 * on non-static, busybox internal functions. Recent versions of gcc
131 * optimize statics automatically. FAST_FUNC on static is required
132 * only if you need to match a function pointer's type */
133#if __GNUC_PREREQ(3,0) && defined(i386) /* || defined(__x86_64__)? */
134/* stdcall makes callee to pop arguments from stack, not caller */
135# define FAST_FUNC __attribute__((regparm(3),stdcall))
136/* #elif ... - add your favorite arch today! */
137#else
138# define FAST_FUNC
139#endif
140
141/* Make all declarations hidden (-fvisibility flag only affects definitions) */
142/* (don't include system headers after this until corresponding pop!) */
143#if __GNUC_PREREQ(4,1)
144# define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN _Pragma("GCC visibility push(hidden)")
145# define POP_SAVED_FUNCTION_VISIBILITY              _Pragma("GCC visibility pop")
146#else
147# define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
148# define POP_SAVED_FUNCTION_VISIBILITY
149#endif
150
151/* ---- Endian Detection ------------------------------------ */
152
153#include <limits.h>
154#if defined(__digital__) && defined(__unix__)
155# include <sex.h>
156#elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) \
157   || defined(__APPLE__)
158# include <sys/resource.h>  /* rlimit */
159# include <machine/endian.h>
160# define bswap_64 __bswap64
161# define bswap_32 __bswap32
162# define bswap_16 __bswap16
163#else
164# include <byteswap.h>
165# include <endian.h>
166#endif
167
168#if defined(__BYTE_ORDER) && __BYTE_ORDER == __BIG_ENDIAN
169# define BB_BIG_ENDIAN 1
170# define BB_LITTLE_ENDIAN 0
171#elif defined(__BYTE_ORDER) && __BYTE_ORDER == __LITTLE_ENDIAN
172# define BB_BIG_ENDIAN 0
173# define BB_LITTLE_ENDIAN 1
174#elif defined(_BYTE_ORDER) && _BYTE_ORDER == _BIG_ENDIAN
175# define BB_BIG_ENDIAN 1
176# define BB_LITTLE_ENDIAN 0
177#elif defined(_BYTE_ORDER) && _BYTE_ORDER == _LITTLE_ENDIAN
178# define BB_BIG_ENDIAN 0
179# define BB_LITTLE_ENDIAN 1
180#elif defined(BYTE_ORDER) && BYTE_ORDER == BIG_ENDIAN
181# define BB_BIG_ENDIAN 1
182# define BB_LITTLE_ENDIAN 0
183#elif defined(BYTE_ORDER) && BYTE_ORDER == LITTLE_ENDIAN
184# define BB_BIG_ENDIAN 0
185# define BB_LITTLE_ENDIAN 1
186#elif defined(__386__)
187# define BB_BIG_ENDIAN 0
188# define BB_LITTLE_ENDIAN 1
189#else
190# error "Can't determine endianness"
191#endif
192
193#if ULONG_MAX > 0xffffffff
194# define bb_bswap_64(x) bswap_64(x)
195#endif
196
197/* SWAP_LEnn means "convert CPU<->little_endian by swapping bytes" */
198#if BB_BIG_ENDIAN
199# define SWAP_BE16(x) (x)
200# define SWAP_BE32(x) (x)
201# define SWAP_BE64(x) (x)
202# define SWAP_LE16(x) bswap_16(x)
203# define SWAP_LE32(x) bswap_32(x)
204# define SWAP_LE64(x) bb_bswap_64(x)
205# define IF_BIG_ENDIAN(...) __VA_ARGS__
206# define IF_LITTLE_ENDIAN(...)
207#else
208# define SWAP_BE16(x) bswap_16(x)
209# define SWAP_BE32(x) bswap_32(x)
210# define SWAP_BE64(x) bb_bswap_64(x)
211# define SWAP_LE16(x) (x)
212# define SWAP_LE32(x) (x)
213# define SWAP_LE64(x) (x)
214# define IF_BIG_ENDIAN(...)
215# define IF_LITTLE_ENDIAN(...) __VA_ARGS__
216#endif
217
218/* ---- Unaligned access ------------------------------------ */
219
220/* NB: unaligned parameter should be a pointer, aligned one -
221 * a lvalue. This makes it more likely to not swap them by mistake
222 */
223#if defined(i386) || defined(__x86_64__) || defined(__powerpc__)
224# include <stdint.h>
225typedef int      bb__aliased_int      FIX_ALIASING;
226typedef uint16_t bb__aliased_uint16_t FIX_ALIASING;
227typedef uint32_t bb__aliased_uint32_t FIX_ALIASING;
228# define move_from_unaligned_int(v, intp) ((v) = *(bb__aliased_int*)(intp))
229# define move_from_unaligned16(v, u16p) ((v) = *(bb__aliased_uint16_t*)(u16p))
230# define move_from_unaligned32(v, u32p) ((v) = *(bb__aliased_uint32_t*)(u32p))
231# define move_to_unaligned16(u16p, v)   (*(bb__aliased_uint16_t*)(u16p) = (v))
232# define move_to_unaligned32(u32p, v)   (*(bb__aliased_uint32_t*)(u32p) = (v))
233/* #elif ... - add your favorite arch today! */
234#else
235/* performs reasonably well (gcc usually inlines memcpy here) */
236# define move_from_unaligned_int(v, intp) (memcpy(&(v), (intp), sizeof(int)))
237# define move_from_unaligned16(v, u16p) (memcpy(&(v), (u16p), 2))
238# define move_from_unaligned32(v, u32p) (memcpy(&(v), (u32p), 4))
239# define move_to_unaligned16(u16p, v) do { \
240    uint16_t __t = (v); \
241    memcpy((u16p), &__t, 4); \
242} while (0)
243# define move_to_unaligned32(u32p, v) do { \
244    uint32_t __t = (v); \
245    memcpy((u32p), &__t, 4); \
246} while (0)
247#endif
248
249/* ---- Compiler dependent settings ------------------------- */
250
251#if (defined __digital__ && defined __unix__) \
252 || defined __APPLE__ \
253 || defined __FreeBSD__ || defined __OpenBSD__ || defined __NetBSD__
254# undef HAVE_MNTENT_H
255# undef HAVE_SYS_STATFS_H
256#else
257# define HAVE_MNTENT_H 1
258/*  Patch bco to compile this busybox on rhel3  */
259#include <linux/version.h>
260#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
261# define HAVE_SYS_STATFS_H 1
262#endif
263#endif
264
265/*----- Kernel versioning ------------------------------------*/
266
267#ifndef KERNEL_VERSION
268#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
269#endif
270
271/* ---- Miscellaneous --------------------------------------- */
272
273#if defined __GLIBC__ || defined __UCLIBC__ \
274 || defined __dietlibc__ || defined _NEWLIB_VERSION
275# include <features.h>
276#endif
277
278/* Size-saving "small" ints (arch-dependent) */
279#if defined(i386) || defined(__x86_64__) || defined(__mips__) || defined(__cris__)
280/* add other arches which benefit from this... */
281typedef signed char smallint;
282typedef unsigned char smalluint;
283#else
284/* for arches where byte accesses generate larger code: */
285typedef int smallint;
286typedef unsigned smalluint;
287#endif
288
289/* ISO C Standard:  7.16  Boolean type and values  <stdbool.h> */
290#if (defined __digital__ && defined __unix__)
291/* old system without (proper) C99 support */
292# define bool smalluint
293#else
294/* modern system, so use it */
295# include <stdbool.h>
296#endif
297
298/* Try to defeat gcc's alignment of "char message[]"-like data */
299#if 1 /* if needed: !defined(arch1) && !defined(arch2) */
300# define ALIGN1 __attribute__((aligned(1)))
301# define ALIGN2 __attribute__((aligned(2)))
302# define ALIGN4 __attribute__((aligned(4)))
303#else
304/* Arches which MUST have 2 or 4 byte alignment for everything are here */
305# define ALIGN1
306# define ALIGN2
307# define ALIGN4
308#endif
309
310
311/* uclibc does not implement daemon() for no-mmu systems.
312 * For 0.9.29 and svn, __ARCH_USE_MMU__ indicates no-mmu reliably.
313 * For earlier versions there is no reliable way to check if we are building
314 * for a mmu-less system.
315 */
316#if ENABLE_NOMMU || \
317    (defined __UCLIBC__ && __UCLIBC_MAJOR__ >= 0 && __UCLIBC_MINOR__ >= 9 && \
318    __UCLIBC_SUBLEVEL__ > 28 && !defined __ARCH_USE_MMU__)
319# define BB_MMU 0
320# define USE_FOR_NOMMU(...) __VA_ARGS__
321# define USE_FOR_MMU(...)
322#else
323# define BB_MMU 1
324# define USE_FOR_NOMMU(...)
325# define USE_FOR_MMU(...) __VA_ARGS__
326#endif
327
328/* Don't use lchown with glibc older than 2.1.x */
329#if defined(__GLIBC__) && __GLIBC__ <= 2 && __GLIBC_MINOR__ < 1
330# define lchown chown
331#endif
332
333#if defined(__digital__) && defined(__unix__)
334
335# include <standards.h>
336# include <inttypes.h>
337# define PRIu32 "u"
338/* use legacy setpgrp(pid_t,pid_t) for now.  move to platform.c */
339# define bb_setpgrp() do { pid_t __me = getpid(); setpgrp(__me, __me); } while (0)
340# if !defined ADJ_OFFSET_SINGLESHOT && defined MOD_CLKA && defined MOD_OFFSET
341#  define ADJ_OFFSET_SINGLESHOT (MOD_CLKA | MOD_OFFSET)
342# endif
343# if !defined ADJ_FREQUENCY && defined MOD_FREQUENCY
344#  define ADJ_FREQUENCY MOD_FREQUENCY
345# endif
346# if !defined ADJ_TIMECONST && defined MOD_TIMECONST
347#  define ADJ_TIMECONST MOD_TIMECONST
348# endif
349# if !defined ADJ_TICK && defined MOD_CLKB
350#  define ADJ_TICK MOD_CLKB
351# endif
352
353#else
354
355# define bb_setpgrp() setpgrp()
356
357#endif
358
359#if defined(__GLIBC__)
360# define fdprintf dprintf
361#endif
362
363#if defined(__dietlibc__)
364# undef HAVE_STRCHRNUL
365#endif
366
367#if defined(__WATCOMC__)
368# undef HAVE_FDPRINTF
369# undef HAVE_MEMRCHR
370# undef HAVE_MKDTEMP
371# undef HAVE_SETBIT
372# undef HAVE_STRCASESTR
373# undef HAVE_STRCHRNUL
374# undef HAVE_STRSEP
375# undef HAVE_STRSIGNAL
376# undef HAVE_VASPRINTF
377#endif
378
379#if defined(__FreeBSD__)
380# undef HAVE_STRCHRNUL
381#endif
382
383/*
384 * Now, define prototypes for all the functions defined in platform.c
385 * These must come after all the HAVE_* macros are defined (or not)
386 */
387
388#ifndef HAVE_FDPRINTF
389extern int fdprintf(int fd, const char *format, ...);
390#endif
391
392#ifndef HAVE_MEMRCHR
393extern void *memrchr(const void *s, int c, size_t n) FAST_FUNC;
394#endif
395
396#ifndef HAVE_MKDTEMP
397extern char *mkdtemp(char *template) FAST_FUNC;
398#endif
399
400#ifndef HAVE_SETBIT
401# define setbit(a, b)  ((a)[(b) >> 3] |= 1 << ((b) & 7))
402# define clrbit(a, b)  ((a)[(b) >> 3] &= ~(1 << ((b) & 7)))
403#endif
404
405#ifndef HAVE_STRCASESTR
406extern char *strcasestr(const char *s, const char *pattern) FAST_FUNC;
407#endif
408
409#ifndef HAVE_STRCHRNUL
410extern char *strchrnul(const char *s, int c) FAST_FUNC;
411#endif
412
413#ifndef HAVE_STRSEP
414extern char *strsep(char **stringp, const char *delim) FAST_FUNC;
415#endif
416
417#ifndef HAVE_STRSIGNAL
418/* Not exactly the same: instead of "Stopped" it shows "STOP" etc */
419# define strsignal(sig) get_signame(sig)
420#endif
421
422#ifndef HAVE_VASPRINTF
423extern int vasprintf(char **string_ptr, const char *format, va_list p) FAST_FUNC;
424#endif
425
426#endif
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