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    Contents of /trunk/mkinitrd-magellan/busybox/include/platform.h

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    Revision 816 - (show annotations) (download)
    Fri Apr 24 18:33:46 2009 UTC (15 years, 1 month ago) by niro
    File MIME type: text/plain
    File size: 10321 byte(s) 
    -updated to busybox-1.13.4
    1 /* vi: set sw=4 ts=4: */
    2 /*
    3 Copyright 2006, Bernhard Reutner-Fischer
    4
    5 Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
    6 */
    7 #ifndef __PLATFORM_H
    8 #define __PLATFORM_H 1
    9
    10 /* Convenience macros to test the version of gcc. */
    11 #undef __GNUC_PREREQ
    12 #if defined __GNUC__ && defined __GNUC_MINOR__
    13 # define __GNUC_PREREQ(maj, min) \
    14 ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
    15 #else
    16 # define __GNUC_PREREQ(maj, min) 0
    17 #endif
    18
    19 /* __restrict is known in EGCS 1.2 and above. */
    20 #if !__GNUC_PREREQ(2,92)
    21 # ifndef __restrict
    22 # define __restrict /* Ignore */
    23 # endif
    24 #endif
    25
    26 /* Define macros for some gcc attributes. This permits us to use the
    27 macros freely, and know that they will come into play for the
    28 version of gcc in which they are supported. */
    29
    30 #if !__GNUC_PREREQ(2,7)
    31 # ifndef __attribute__
    32 # define __attribute__(x)
    33 # endif
    34 #endif
    35
    36 #undef inline
    37 #if defined(__STDC_VERSION__) && __STDC_VERSION__ > 199901L
    38 /* it's a keyword */
    39 #else
    40 # if __GNUC_PREREQ(2,7)
    41 # define inline __inline__
    42 # else
    43 # define inline
    44 # endif
    45 #endif
    46
    47 #ifndef __const
    48 # define __const const
    49 #endif
    50
    51 #define UNUSED_PARAM __attribute__ ((__unused__))
    52 #define NORETURN __attribute__ ((__noreturn__))
    53 #define PACKED __attribute__ ((__packed__))
    54 #define ALIGNED(m) __attribute__ ((__aligned__(m)))
    55 /* __NO_INLINE__: some gcc's do not honor inlining! :( */
    56 #if __GNUC_PREREQ(3,0) && !defined(__NO_INLINE__)
    57 # define ALWAYS_INLINE __attribute__ ((always_inline)) inline
    58 /* I've seen a toolchain where I needed __noinline__ instead of noinline */
    59 # define NOINLINE __attribute__((__noinline__))
    60 # if !ENABLE_WERROR
    61 # define DEPRECATED __attribute__ ((__deprecated__))
    62 # define UNUSED_PARAM_RESULT __attribute__ ((warn_unused_result))
    63 # else
    64 # define DEPRECATED /* n/a */
    65 # define UNUSED_PARAM_RESULT /* n/a */
    66 # endif
    67 #else
    68 # define ALWAYS_INLINE inline /* n/a */
    69 # define NOINLINE /* n/a */
    70 # define DEPRECATED /* n/a */
    71 # define UNUSED_PARAM_RESULT /* n/a */
    72 #endif
    73
    74 /* -fwhole-program makes all symbols local. The attribute externally_visible
    75 forces a symbol global. */
    76 #if __GNUC_PREREQ(4,1)
    77 # define EXTERNALLY_VISIBLE __attribute__(( visibility("default") ))
    78 //__attribute__ ((__externally_visible__))
    79 #else
    80 # define EXTERNALLY_VISIBLE
    81 #endif /* GNUC >= 4.1 */
    82
    83 /* We use __extension__ in some places to suppress -pedantic warnings
    84 about GCC extensions. This feature didn't work properly before
    85 gcc 2.8. */
    86 #if !__GNUC_PREREQ(2,8)
    87 # ifndef __extension__
    88 # define __extension__
    89 # endif
    90 #endif
    91
    92 /* gcc-2.95 had no va_copy but only __va_copy. */
    93 #if !__GNUC_PREREQ(3,0)
    94 # include <stdarg.h>
    95 # if !defined va_copy && defined __va_copy
    96 # define va_copy(d,s) __va_copy((d),(s))
    97 # endif
    98 #endif
    99
    100 /* FAST_FUNC is a qualifier which (possibly) makes function call faster
    101 * and/or smaller by using modified ABI. It is usually only needed
    102 * on non-static, busybox internal functions. Recent versions of gcc
    103 * optimize statics automatically. FAST_FUNC on static is required
    104 * only if you need to match a function pointer's type */
    105 #if __GNUC_PREREQ(3,0) && defined(i386) /* || defined(__x86_64__)? */
    106 /* stdcall makes callee to pop arguments from stack, not caller */
    107 # define FAST_FUNC __attribute__((regparm(3),stdcall))
    108 /* #elif ... - add your favorite arch today! */
    109 #else
    110 # define FAST_FUNC
    111 #endif
    112
    113 /* ---- Endian Detection ------------------------------------ */
    114
    115 #if (defined __digital__ && defined __unix__)
    116 # include <sex.h>
    117 # define __BIG_ENDIAN__ (BYTE_ORDER == BIG_ENDIAN)
    118 # define __BYTE_ORDER BYTE_ORDER
    119 #elif !defined __APPLE__
    120 # include <byteswap.h>
    121 # include <endian.h>
    122 #endif
    123
    124 #ifdef __BIG_ENDIAN__
    125 # define BB_BIG_ENDIAN 1
    126 # define BB_LITTLE_ENDIAN 0
    127 #elif __BYTE_ORDER == __BIG_ENDIAN
    128 # define BB_BIG_ENDIAN 1
    129 # define BB_LITTLE_ENDIAN 0
    130 #else
    131 # define BB_BIG_ENDIAN 0
    132 # define BB_LITTLE_ENDIAN 1
    133 #endif
    134
    135 /* SWAP_LEnn means "convert CPU<->little_endian by swapping bytes" */
    136 #if BB_BIG_ENDIAN
    137 #define SWAP_BE16(x) (x)
    138 #define SWAP_BE32(x) (x)
    139 #define SWAP_BE64(x) (x)
    140 #define SWAP_LE16(x) bswap_16(x)
    141 #define SWAP_LE32(x) bswap_32(x)
    142 #define SWAP_LE64(x) bswap_64(x)
    143 #else
    144 #define SWAP_BE16(x) bswap_16(x)
    145 #define SWAP_BE32(x) bswap_32(x)
    146 #define SWAP_BE64(x) bswap_64(x)
    147 #define SWAP_LE16(x) (x)
    148 #define SWAP_LE32(x) (x)
    149 #define SWAP_LE64(x) (x)
    150 #endif
    151
    152 /* ---- Unaligned access ------------------------------------ */
    153
    154 /* parameter is supposed to be an uint32_t* ptr */
    155 #if defined(i386) || defined(__x86_64__)
    156 #define get_unaligned_u32p(u32p) (*(u32p))
    157 /* #elif ... - add your favorite arch today! */
    158 #else
    159 /* performs reasonably well (gcc usually inlines memcpy here) */
    160 #define get_unaligned_u32p(u32p) ({ uint32_t __t; memcpy(&__t, (u32p), 4); __t; })
    161 #endif
    162
    163 /* ---- Networking ------------------------------------------ */
    164
    165 #ifndef __APPLE__
    166 # include <arpa/inet.h>
    167 # ifndef __socklen_t_defined
    168 typedef int socklen_t;
    169 # endif
    170 #else
    171 # include <netinet/in.h>
    172 #endif
    173
    174 /* ---- Compiler dependent settings ------------------------- */
    175
    176 #if (defined __digital__ && defined __unix__) || defined __APPLE__
    177 # undef HAVE_MNTENT_H
    178 # undef HAVE_SYS_STATFS_H
    179 #else
    180 # define HAVE_MNTENT_H 1
    181 # define HAVE_SYS_STATFS_H 1
    182 #endif /* ___digital__ && __unix__ */
    183
    184 /* linux/loop.h relies on __u64. Make sure we have that as a proper type
    185 * until userspace is widely fixed. */
    186 #if (defined __INTEL_COMPILER && !defined __GNUC__) || \
    187 (defined __GNUC__ && defined __STRICT_ANSI__)
    188 __extension__ typedef __signed__ long long __s64;
    189 __extension__ typedef unsigned long long __u64;
    190 #endif
    191
    192 /*----- Kernel versioning ------------------------------------*/
    193
    194 #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
    195
    196 /* ---- Miscellaneous --------------------------------------- */
    197
    198 #if defined(__GNU_LIBRARY__) && __GNU_LIBRARY__ < 5 && \
    199 !defined(__dietlibc__) && \
    200 !defined(_NEWLIB_VERSION) && \
    201 !(defined __digital__ && defined __unix__)
    202 # error "Sorry, this libc version is not supported :("
    203 #endif
    204
    205 /* Don't perpetuate e2fsck crap into the headers. Clean up e2fsck instead. */
    206
    207 #if defined __GLIBC__ || defined __UCLIBC__ \
    208 || defined __dietlibc__ || defined _NEWLIB_VERSION
    209 #include <features.h>
    210 #define HAVE_FEATURES_H
    211 #include <stdint.h>
    212 #define HAVE_STDINT_H
    213 #elif !defined __APPLE__
    214 /* Largest integral types. */
    215 #if __BIG_ENDIAN__
    216 typedef long intmax_t;
    217 typedef unsigned long uintmax_t;
    218 #else
    219 __extension__
    220 typedef long long intmax_t;
    221 __extension__
    222 typedef unsigned long long uintmax_t;
    223 #endif
    224 #endif
    225
    226 /* Size-saving "small" ints (arch-dependent) */
    227 #if defined(i386) || defined(__x86_64__) || defined(__mips__) || defined(__cris__)
    228 /* add other arches which benefit from this... */
    229 typedef signed char smallint;
    230 typedef unsigned char smalluint;
    231 #else
    232 /* for arches where byte accesses generate larger code: */
    233 typedef int smallint;
    234 typedef unsigned smalluint;
    235 #endif
    236
    237 /* ISO C Standard: 7.16 Boolean type and values <stdbool.h> */
    238 #if (defined __digital__ && defined __unix__)
    239 /* old system without (proper) C99 support */
    240 #define bool smalluint
    241 #else
    242 /* modern system, so use it */
    243 #include <stdbool.h>
    244 #endif
    245
    246 /* Try to defeat gcc's alignment of "char message[]"-like data */
    247 #if 1 /* if needed: !defined(arch1) && !defined(arch2) */
    248 #define ALIGN1 __attribute__((aligned(1)))
    249 #define ALIGN2 __attribute__((aligned(2)))
    250 #else
    251 /* Arches which MUST have 2 or 4 byte alignment for everything are here */
    252 #define ALIGN1
    253 #define ALIGN2
    254 #endif
    255
    256
    257 /* uclibc does not implement daemon() for no-mmu systems.
    258 * For 0.9.29 and svn, __ARCH_USE_MMU__ indicates no-mmu reliably.
    259 * For earlier versions there is no reliable way to check if we are building
    260 * for a mmu-less system.
    261 */
    262 #if ENABLE_NOMMU || \
    263 (defined __UCLIBC__ && __UCLIBC_MAJOR__ >= 0 && __UCLIBC_MINOR__ >= 9 && \
    264 __UCLIBC_SUBLEVEL__ > 28 && !defined __ARCH_USE_MMU__)
    265 #define BB_MMU 0
    266 #define USE_FOR_NOMMU(...) __VA_ARGS__
    267 #define USE_FOR_MMU(...)
    268 #else
    269 #define BB_MMU 1
    270 #define USE_FOR_NOMMU(...)
    271 #define USE_FOR_MMU(...) __VA_ARGS__
    272 #endif
    273
    274 /* Platforms that haven't got dprintf need to implement fdprintf() in
    275 * libbb. This would require a platform.c. It's not going to be cleaned
    276 * out of the tree, so stop saying it should be. */
    277 #if !defined(__dietlibc__)
    278 /* Needed for: glibc */
    279 /* Not needed for: dietlibc */
    280 /* Others: ?? (add as needed) */
    281 #define fdprintf dprintf
    282 #endif
    283
    284 #if defined(__dietlibc__)
    285 static ALWAYS_INLINE char* strchrnul(const char *s, char c)
    286 {
    287 while (*s && *s != c) ++s;
    288 return (char*)s;
    289 }
    290 #endif
    291
    292 /* Don't use lchown with glibc older than 2.1.x ... uClibc lacks it */
    293 #if (defined __GLIBC__ && __GLIBC__ <= 2 && __GLIBC_MINOR__ < 1) || \
    294 defined __UC_LIBC__
    295 # define lchown chown
    296 #endif
    297
    298 #if (defined __digital__ && defined __unix__)
    299 #include <standards.h>
    300 #define HAVE_STANDARDS_H
    301 #include <inttypes.h>
    302 #define HAVE_INTTYPES_H
    303 #define PRIu32 "u"
    304
    305 /* use legacy setpgrp(pid_t,pid_t) for now. move to platform.c */
    306 #define bb_setpgrp() do { pid_t __me = getpid(); setpgrp(__me,__me); } while (0)
    307
    308 #if !defined ADJ_OFFSET_SINGLESHOT && defined MOD_CLKA && defined MOD_OFFSET
    309 #define ADJ_OFFSET_SINGLESHOT (MOD_CLKA | MOD_OFFSET)
    310 #endif
    311 #if !defined ADJ_FREQUENCY && defined MOD_FREQUENCY
    312 #define ADJ_FREQUENCY MOD_FREQUENCY
    313 #endif
    314 #if !defined ADJ_TIMECONST && defined MOD_TIMECONST
    315 #define ADJ_TIMECONST MOD_TIMECONST
    316 #endif
    317 #if !defined ADJ_TICK && defined MOD_CLKB
    318 #define ADJ_TICK MOD_CLKB
    319 #endif
    320
    321 #else
    322 #define bb_setpgrp() setpgrp()
    323 #endif
    324
    325 #if defined(__linux__)
    326 #include <sys/mount.h>
    327 /* Make sure we have all the new mount flags we actually try to use. */
    328 #ifndef MS_BIND
    329 #define MS_BIND (1<<12)
    330 #endif
    331 #ifndef MS_MOVE
    332 #define MS_MOVE (1<<13)
    333 #endif
    334 #ifndef MS_RECURSIVE
    335 #define MS_RECURSIVE (1<<14)
    336 #endif
    337 #ifndef MS_SILENT
    338 #define MS_SILENT (1<<15)
    339 #endif
    340
    341 /* The shared subtree stuff, which went in around 2.6.15. */
    342 #ifndef MS_UNBINDABLE
    343 #define MS_UNBINDABLE (1<<17)
    344 #endif
    345 #ifndef MS_PRIVATE
    346 #define MS_PRIVATE (1<<18)
    347 #endif
    348 #ifndef MS_SLAVE
    349 #define MS_SLAVE (1<<19)
    350 #endif
    351 #ifndef MS_SHARED
    352 #define MS_SHARED (1<<20)
    353 #endif
    354 #ifndef MS_RELATIME
    355 #define MS_RELATIME (1 << 21)
    356 #endif
    357
    358 #if !defined(BLKSSZGET)
    359 #define BLKSSZGET _IO(0x12, 104)
    360 #endif
    361 #if !defined(BLKGETSIZE64)
    362 #define BLKGETSIZE64 _IOR(0x12,114,size_t)
    363 #endif
    364 #endif
    365
    366 #endif /* platform.h */