release/src/router/busybox/include/platform.h

   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 BB_PLATFORM_H
   8 #define BB_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
  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 /* Make all declarations hidden (-fvisibility flag only affects definitions) */
 114 /* (don't include system headers after this until corresponding pop!) */
 115 #if __GNUC_PREREQ(4,1)
 116 # define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN _Pragma("GCC visibility push(hidden)")
 117 # define POP_SAVED_FUNCTION_VISIBILITY              _Pragma("GCC visibility pop")
 118 #else
 119 # define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
 120 # define POP_SAVED_FUNCTION_VISIBILITY
 121 #endif
 122
 123 /* ---- Endian Detection ------------------------------------ */
 124
 125 #if (defined __digital__ && defined __unix__)
 126 # include <sex.h>
 127 # define __BIG_ENDIAN__ (BYTE_ORDER == BIG_ENDIAN)
 128 # define __BYTE_ORDER BYTE_ORDER
 129 #elif !defined __APPLE__
 130 # include <byteswap.h>
 131 # include <endian.h>
 132 #endif
 133
 134 #ifdef __BIG_ENDIAN__
 135 # define BB_BIG_ENDIAN 1
 136 # define BB_LITTLE_ENDIAN 0
 137 #elif __BYTE_ORDER == __BIG_ENDIAN
 138 # define BB_BIG_ENDIAN 1
 139 # define BB_LITTLE_ENDIAN 0
 140 #else
 141 # define BB_BIG_ENDIAN 0
 142 # define BB_LITTLE_ENDIAN 1
 143 #endif
 144
 145 /* SWAP_LEnn means "convert CPU<->little_endian by swapping bytes" */
 146 #if BB_BIG_ENDIAN
 147 #define SWAP_BE16(x) (x)
 148 #define SWAP_BE32(x) (x)
 149 #define SWAP_BE64(x) (x)
 150 #define SWAP_LE16(x) bswap_16(x)
 151 #define SWAP_LE32(x) bswap_32(x)
 152 #define SWAP_LE64(x) bswap_64(x)
 153 #else
 154 #define SWAP_BE16(x) bswap_16(x)
 155 #define SWAP_BE32(x) bswap_32(x)
 156 #define SWAP_BE64(x) bswap_64(x)
 157 #define SWAP_LE16(x) (x)
 158 #define SWAP_LE32(x) (x)
 159 #define SWAP_LE64(x) (x)
 160 #endif
 161
 162 /* ---- Unaligned access ------------------------------------ */
 163
 164 /* NB: unaligned parameter should be a pointer, aligned one -
 165  * a lvalue. This makes it more likely to not swap them by mistake
 166  */
 167 #if defined(i386) || defined(__x86_64__)
 168 #define move_from_unaligned16(v, u16p) ((v) = *(uint16_t*)(u16p))
 169 #define move_from_unaligned32(v, u32p) ((v) = *(uint32_t*)(u32p))
 170 #define move_to_unaligned32(u32p, v)   (*(uint32_t*)(u32p) = (v))
 171 /* #elif ... - add your favorite arch today! */
 172 #else
 173 /* performs reasonably well (gcc usually inlines memcpy here) */
 174 #define move_from_unaligned16(v, u16p) (memcpy(&(v), (u16p), 2))
 175 #define move_from_unaligned32(v, u32p) (memcpy(&(v), (u32p), 4))
 176 #define move_to_unaligned32(u32p, v)   (memcpy((u32p), &(v), 4))
 177 #endif
 178
 179 /* ---- Networking ------------------------------------------ */
 180
 181 #ifndef __APPLE__
 182 # include <arpa/inet.h>
 183 # ifndef __socklen_t_defined
 184 typedef int socklen_t;
 185 # endif
 186 #else
 187 # include <netinet/in.h>
 188 #endif
 189
 190 /* ---- Compiler dependent settings ------------------------- */
 191
 192 #if (defined __digital__ && defined __unix__) || defined __APPLE__
 193 # undef HAVE_MNTENT_H
 194 # undef HAVE_SYS_STATFS_H
 195 #else
 196 # define HAVE_MNTENT_H 1
 197 # define HAVE_SYS_STATFS_H 1
 198 #endif /* ___digital__ && __unix__ */
 199
 200 /* linux/loop.h relies on __u64. Make sure we have that as a proper type
 201  * until userspace is widely fixed.  */
 202 #if (defined __INTEL_COMPILER && !defined __GNUC__) || \
 203         (defined __GNUC__ && defined __STRICT_ANSI__)
 204 __extension__ typedef long long __s64;
 205 __extension__ typedef unsigned long long __u64;
 206 #endif
 207
 208 /*----- Kernel versioning ------------------------------------*/
 209
 210 #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
 211
 212 /* ---- Miscellaneous --------------------------------------- */
 213
 214 #if defined(__GNU_LIBRARY__) && __GNU_LIBRARY__ < 5 && \
 215         !defined(__dietlibc__) && \
 216         !defined(_NEWLIB_VERSION) && \
 217         !(defined __digital__ && defined __unix__)
 218 # error "Sorry, this libc version is not supported :("
 219 #endif
 220
 221 /* Don't perpetuate e2fsck crap into the headers.  Clean up e2fsck instead. */
 222
 223 #if defined __GLIBC__ || defined __UCLIBC__ \
 224         || defined __dietlibc__ || defined _NEWLIB_VERSION
 225 #include <features.h>
 226 #define HAVE_FEATURES_H
 227 #include <stdint.h>
 228 #define HAVE_STDINT_H
 229 #elif !defined __APPLE__
 230 /* Largest integral types.  */
 231 #if __BIG_ENDIAN__
 232 typedef long                intmax_t;
 233 typedef unsigned long       uintmax_t;
 234 #else
 235 __extension__
 236 typedef long long           intmax_t;
 237 __extension__
 238 typedef unsigned long long  uintmax_t;
 239 #endif
 240 #endif
 241
 242 /* Size-saving "small" ints (arch-dependent) */
 243 #if defined(i386) || defined(__x86_64__) || defined(__mips__) || defined(__cris__)
 244 /* add other arches which benefit from this... */
 245 typedef signed char smallint;
 246 typedef unsigned char smalluint;
 247 #else
 248 /* for arches where byte accesses generate larger code: */
 249 typedef int smallint;
 250 typedef unsigned smalluint;
 251 #endif
 252
 253 /* ISO C Standard:  7.16  Boolean type and values  <stdbool.h> */
 254 #if (defined __digital__ && defined __unix__)
 255 /* old system without (proper) C99 support */
 256 #define bool smalluint
 257 #else
 258 /* modern system, so use it */
 259 #include <stdbool.h>
 260 #endif
 261
 262 /* Try to defeat gcc's alignment of "char message[]"-like data */
 263 #if 1 /* if needed: !defined(arch1) && !defined(arch2) */
 264 #define ALIGN1 __attribute__((aligned(1)))
 265 #define ALIGN2 __attribute__((aligned(2)))
 266 #else
 267 /* Arches which MUST have 2 or 4 byte alignment for everything are here */
 268 #define ALIGN1
 269 #define ALIGN2
 270 #endif
 271
 272
 273 /* uclibc does not implement daemon() for no-mmu systems.
 274  * For 0.9.29 and svn, __ARCH_USE_MMU__ indicates no-mmu reliably.
 275  * For earlier versions there is no reliable way to check if we are building
 276  * for a mmu-less system.
 277  */
 278 #if ENABLE_NOMMU || \
 279     (defined __UCLIBC__ && __UCLIBC_MAJOR__ >= 0 && __UCLIBC_MINOR__ >= 9 && \
 280     __UCLIBC_SUBLEVEL__ > 28 && !defined __ARCH_USE_MMU__)
 281 #define BB_MMU 0
 282 #define USE_FOR_NOMMU(...) __VA_ARGS__
 283 #define USE_FOR_MMU(...)
 284 #else
 285 #define BB_MMU 1
 286 #define USE_FOR_NOMMU(...)
 287 #define USE_FOR_MMU(...) __VA_ARGS__
 288 #endif
 289
 290 /* Platforms that haven't got dprintf need to implement fdprintf() in
 291  * libbb.  This would require a platform.c.  It's not going to be cleaned
 292  * out of the tree, so stop saying it should be. */
 293 #if !defined(__dietlibc__)
 294 /* Needed for: glibc */
 295 /* Not needed for: dietlibc */
 296 /* Others: ?? (add as needed) */
 297 #define fdprintf dprintf
 298 #endif
 299
 300 #if defined(__dietlibc__)
 301 static ALWAYS_INLINE char* strchrnul(const char *s, char c)
 302 {
 303         while (*s && *s != c) ++s;
 304         return (char*)s;
 305 }
 306 #endif
 307
 308 /* Don't use lchown with glibc older than 2.1.x ... uClibc lacks it */
 309 #if (defined __GLIBC__ && __GLIBC__ <= 2 && __GLIBC_MINOR__ < 1) || \
 310     defined __UC_LIBC__
 311 # define lchown chown
 312 #endif
 313
 314 #if (defined __digital__ && defined __unix__)
 315
 316 # include <standards.h>
 317 # define HAVE_STANDARDS_H
 318 # include <inttypes.h>
 319 # define HAVE_INTTYPES_H
 320 # define PRIu32 "u"
 321 /* use legacy setpgrp(pid_t,pid_t) for now.  move to platform.c */
 322 # define bb_setpgrp() do { pid_t __me = getpid(); setpgrp(__me,__me); } while (0)
 323
 324 # if !defined ADJ_OFFSET_SINGLESHOT && defined MOD_CLKA && defined MOD_OFFSET
 325 #  define ADJ_OFFSET_SINGLESHOT (MOD_CLKA | MOD_OFFSET)
 326 # endif
 327 # if !defined ADJ_FREQUENCY && defined MOD_FREQUENCY
 328 #  define ADJ_FREQUENCY MOD_FREQUENCY
 329 # endif
 330 # if !defined ADJ_TIMECONST && defined MOD_TIMECONST
 331 #  define ADJ_TIMECONST MOD_TIMECONST
 332 # endif
 333 # if !defined ADJ_TICK && defined MOD_CLKB
 334 #  define ADJ_TICK MOD_CLKB
 335 # endif
 336
 337 #else /* !__digital__ */
 338
 339 # define bb_setpgrp() setpgrp()
 340
 341 #endif
 342
 343 #if defined(__linux__)
 344 #include <sys/mount.h>
 345 /* Make sure we have all the new mount flags we actually try to use. */
 346 #ifndef MS_BIND
 347 #define MS_BIND        (1<<12)
 348 #endif
 349 #ifndef MS_MOVE
 350 #define MS_MOVE        (1<<13)
 351 #endif
 352 #ifndef MS_RECURSIVE
 353 #define MS_RECURSIVE   (1<<14)
 354 #endif
 355 #ifndef MS_SILENT
 356 #define MS_SILENT      (1<<15)
 357 #endif
 358
 359 /* The shared subtree stuff, which went in around 2.6.15. */
 360 #ifndef MS_UNBINDABLE
 361 #define MS_UNBINDABLE  (1<<17)
 362 #endif
 363 #ifndef MS_PRIVATE
 364 #define MS_PRIVATE     (1<<18)
 365 #endif
 366 #ifndef MS_SLAVE
 367 #define MS_SLAVE       (1<<19)
 368 #endif
 369 #ifndef MS_SHARED
 370 #define MS_SHARED      (1<<20)
 371 #endif
 372 #ifndef MS_RELATIME
 373 #define MS_RELATIME   (1 << 21)
 374 #endif
 375
 376 #if !defined(BLKSSZGET)
 377 #define BLKSSZGET _IO(0x12, 104)
 378 #endif
 379 #if !defined(BLKGETSIZE64)
 380 #define BLKGETSIZE64 _IOR(0x12,114,size_t)
 381 #endif
 382 #endif
 383
 384 #endif