ndk/platforms/android-21/arch-x86_64/usr/include/sys/endian.h

   1 /*      $OpenBSD: endian.h,v 1.17 2006/01/06 18:53:05 millert Exp $     */
   2
   3 /*-
   4  * Copyright (c) 1997 Niklas Hallqvist.  All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 /*
  28  * Generic definitions for little- and big-endian systems.  Other endianesses
  29  * has to be dealt with in the specific machine/endian.h file for that port.
  30  *
  31  * This file is meant to be included from a little- or big-endian port's
  32  * machine/endian.h after setting _BYTE_ORDER to either 1234 for little endian
  33  * or 4321 for big..
  34  */
  35
  36 #ifndef _SYS_ENDIAN_H_
  37 #define _SYS_ENDIAN_H_
  38
  39 #include <sys/cdefs.h>
  40 #include <machine/endian.h>
  41
  42 #include <stdint.h>
  43
  44 #define _LITTLE_ENDIAN  1234
  45 #define _BIG_ENDIAN     4321
  46 #define _PDP_ENDIAN     3412
  47
  48 #if __BSD_VISIBLE
  49 #define LITTLE_ENDIAN   _LITTLE_ENDIAN
  50 #define BIG_ENDIAN      _BIG_ENDIAN
  51 #define PDP_ENDIAN      _PDP_ENDIAN
  52 #define BYTE_ORDER      _BYTE_ORDER
  53 #endif
  54
  55 #ifdef __GNUC__
  56
  57 #define __swap16gen(x) __statement({                                    \
  58         __uint16_t __swap16gen_x = (x);                                 \
  59                                                                         \
  60         (__uint16_t)((__swap16gen_x & 0xff) << 8 |                      \
  61             (__swap16gen_x & 0xff00) >> 8);                             \
  62 })
  63
  64 #define __swap32gen(x) __statement({                                    \
  65         __uint32_t __swap32gen_x = (x);                                 \
  66                                                                         \
  67         (__uint32_t)((__swap32gen_x & 0xff) << 24 |                     \
  68             (__swap32gen_x & 0xff00) << 8 |                             \
  69             (__swap32gen_x & 0xff0000) >> 8 |                           \
  70             (__swap32gen_x & 0xff000000) >> 24);                        \
  71 })
  72
  73 #define __swap64gen(x) __statement({                                    \
  74         __uint64_t __swap64gen_x = (x);                                 \
  75                                                                         \
  76         (__uint64_t)((__swap64gen_x & 0xff) << 56 |                     \
  77             (__swap64gen_x & 0xff00ULL) << 40 |                         \
  78             (__swap64gen_x & 0xff0000ULL) << 24 |                       \
  79             (__swap64gen_x & 0xff000000ULL) << 8 |                      \
  80             (__swap64gen_x & 0xff00000000ULL) >> 8 |                    \
  81             (__swap64gen_x & 0xff0000000000ULL) >> 24 |                 \
  82             (__swap64gen_x & 0xff000000000000ULL) >> 40 |               \
  83             (__swap64gen_x & 0xff00000000000000ULL) >> 56);             \
  84 })
  85
  86 #else /* __GNUC__ */
  87
  88 /* Note that these macros evaluate their arguments several times.  */
  89 #define __swap16gen(x)                                                  \
  90     (__uint16_t)(((__uint16_t)(x) & 0xff) << 8 | ((__uint16_t)(x) & 0xff00) >> 8)
  91
  92 #define __swap32gen(x)                                                  \
  93     (__uint32_t)(((__uint32_t)(x) & 0xff) << 24 |                       \
  94     ((__uint32_t)(x) & 0xff00) << 8 | ((__uint32_t)(x) & 0xff0000) >> 8 |\
  95     ((__uint32_t)(x) & 0xff000000) >> 24)
  96
  97 #define __swap64gen(x)                                                  \
  98         (__uint64_t)((((__uint64_t)(x) & 0xff) << 56) |                 \
  99             ((__uint64_t)(x) & 0xff00ULL) << 40 |                       \
 100             ((__uint64_t)(x) & 0xff0000ULL) << 24 |                     \
 101             ((__uint64_t)(x) & 0xff000000ULL) << 8 |                    \
 102             ((__uint64_t)(x) & 0xff00000000ULL) >> 8 |                  \
 103             ((__uint64_t)(x) & 0xff0000000000ULL) >> 24 |               \
 104             ((__uint64_t)(x) & 0xff000000000000ULL) >> 40 |             \
 105             ((__uint64_t)(x) & 0xff00000000000000ULL) >> 56)
 106
 107 #endif /* __GNUC__ */
 108
 109 /*
 110  * Define MD_SWAP if you provide swap{16,32}md functions/macros that are
 111  * optimized for your architecture,  These will be used for swap{16,32}
 112  * unless the argument is a constant and we are using GCC, where we can
 113  * take advantage of the CSE phase much better by using the generic version.
 114  */
 115 #ifdef MD_SWAP
 116 #if __GNUC__
 117
 118 #define __swap16(x) __statement({                                       \
 119         __uint16_t __swap16_x = (x);                                    \
 120                                                                         \
 121         __builtin_constant_p(x) ? __swap16gen(__swap16_x) :             \
 122             __swap16md(__swap16_x);                                     \
 123 })
 124
 125 #define __swap32(x) __statement({                                       \
 126         __uint32_t __swap32_x = (x);                                    \
 127                                                                         \
 128         __builtin_constant_p(x) ? __swap32gen(__swap32_x) :             \
 129             __swap32md(__swap32_x);                                     \
 130 })
 131
 132 #define __swap64(x) __statement({                                       \
 133         __uint64_t __swap64_x = (x);                                    \
 134                                                                         \
 135         __builtin_constant_p(x) ? __swap64gen(__swap64_x) :             \
 136             __swap64md(__swap64_x);                                     \
 137 })
 138
 139 #endif /* __GNUC__  */
 140
 141 #else /* MD_SWAP */
 142 #define __swap16 __swap16gen
 143 #define __swap32 __swap32gen
 144 #define __swap64 __swap64gen
 145 #endif /* MD_SWAP */
 146
 147 #define __swap16_multi(v, n) do {                                               \
 148         __size_t __swap16_multi_n = (n);                                \
 149         __uint16_t *__swap16_multi_v = (v);                             \
 150                                                                         \
 151         while (__swap16_multi_n) {                                      \
 152                 *__swap16_multi_v = swap16(*__swap16_multi_v);          \
 153                 __swap16_multi_v++;                                     \
 154                 __swap16_multi_n--;                                     \
 155         }                                                               \
 156 } while (0)
 157
 158 #if __BSD_VISIBLE
 159 #define swap16 __swap16
 160 #define swap32 __swap32
 161 #define swap64 __swap64
 162 #define swap16_multi __swap16_multi
 163 #endif /* __BSD_VISIBLE */
 164
 165 #if _BYTE_ORDER == _LITTLE_ENDIAN
 166
 167 /* Can be overridden by machine/endian.h before inclusion of this file.  */
 168 #ifndef _QUAD_HIGHWORD
 169 #define _QUAD_HIGHWORD 1
 170 #endif
 171 #ifndef _QUAD_LOWWORD
 172 #define _QUAD_LOWWORD 0
 173 #endif
 174
 175 #if __BSD_VISIBLE
 176 #define htobe16 __swap16
 177 #define htobe32 __swap32
 178 #define htobe64 __swap64
 179 #define betoh16 __swap16
 180 #define betoh32 __swap32
 181 #define betoh64 __swap64
 182
 183 #define htole16(x) (x)
 184 #define htole32(x) (x)
 185 #define htole64(x) (x)
 186 #define letoh16(x) (x)
 187 #define letoh32(x) (x)
 188 #define letoh64(x) (x)
 189 #endif /* __BSD_VISIBLE */
 190
 191 /* glibc compatibility. */
 192 __BEGIN_DECLS
 193 uint32_t htonl(uint32_t) __pure2;
 194 uint16_t htons(uint16_t) __pure2;
 195 uint32_t ntohl(uint32_t) __pure2;
 196 uint16_t ntohs(uint16_t) __pure2;
 197 __END_DECLS
 198
 199 #define htonl(x) __swap32(x)
 200 #define htons(x) __swap16(x)
 201 #define ntohl(x) __swap32(x)
 202 #define ntohs(x) __swap16(x)
 203
 204 /* Bionic additions */
 205 #define htonq(x) __swap64(x)
 206 #define ntohq(x) __swap64(x)
 207
 208 #define __LITTLE_ENDIAN_BITFIELD
 209
 210 #endif /* _BYTE_ORDER */
 211
 212 #if _BYTE_ORDER == _BIG_ENDIAN
 213
 214 /* Can be overridden by machine/endian.h before inclusion of this file.  */
 215 #ifndef _QUAD_HIGHWORD
 216 #define _QUAD_HIGHWORD 0
 217 #endif
 218 #ifndef _QUAD_LOWWORD
 219 #define _QUAD_LOWWORD 1
 220 #endif
 221
 222 #if __BSD_VISIBLE
 223 #define htole16 __swap16
 224 #define htole32 __swap32
 225 #define htole64 __swap64
 226 #define letoh16 __swap16
 227 #define letoh32 __swap32
 228 #define letoh64 __swap64
 229
 230 #define htobe16(x) (x)
 231 #define htobe32(x) (x)
 232 #define htobe64(x) (x)
 233 #define betoh16(x) (x)
 234 #define betoh32(x) (x)
 235 #define betoh64(x) (x)
 236 #endif /* __BSD_VISIBLE */
 237
 238 #define htons(x) (x)
 239 #define htonl(x) (x)
 240 #define ntohs(x) (x)
 241 #define ntohl(x) (x)
 242
 243 /* Bionic additions */
 244 #define ntohq(x) (x)
 245 #define htonq(x) (x)
 246
 247 #define __BIG_ENDIAN_BITFIELD
 248
 249 #endif /* _BYTE_ORDER */
 250
 251 #if __BSD_VISIBLE
 252 #define NTOHL(x) (x) = ntohl((u_int32_t)(x))
 253 #define NTOHS(x) (x) = ntohs((u_int16_t)(x))
 254 #define HTONL(x) (x) = htonl((u_int32_t)(x))
 255 #define HTONS(x) (x) = htons((u_int16_t)(x))
 256 #endif
 257
 258
 259 #define  __BYTE_ORDER       _BYTE_ORDER
 260 #ifndef  __LITTLE_ENDIAN
 261 #define  __LITTLE_ENDIAN    _LITTLE_ENDIAN
 262 #endif
 263 #ifndef  __BIG_ENDIAN
 264 #define  __BIG_ENDIAN       _BIG_ENDIAN
 265 #endif
 266
 267
 268 #ifdef __BSD_VISIBLE
 269 /*
 270  * glibc-compatible beXXtoh/leXXtoh synonyms for htobeXX/htoleXX.
 271  * The BSDs export both sets of names, bionic historically only
 272  * exported the ones above (or on the rhs here), and glibc only
 273  * exports these names (on the lhs).
 274  */
 275 #define be16toh(x) htobe16(x)
 276 #define be32toh(x) htobe32(x)
 277 #define be64toh(x) htobe64(x)
 278 #define le16toh(x) htole16(x)
 279 #define le32toh(x) htole32(x)
 280 #define le64toh(x) htole64(x)
 281 #endif
 282
 283 #endif /* _SYS_ENDIAN_H_ */