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/_types.h> 41 42#define _LITTLE_ENDIAN 1234 43#define _BIG_ENDIAN 4321 44#define _PDP_ENDIAN 3412 45 46#if __BSD_VISIBLE 47#define LITTLE_ENDIAN _LITTLE_ENDIAN 48#define BIG_ENDIAN _BIG_ENDIAN 49#define PDP_ENDIAN _PDP_ENDIAN 50#define BYTE_ORDER _BYTE_ORDER 51#endif 52 53#ifdef __GNUC__ 54 55#define __swap16gen(x) __statement({ \ 56 __uint16_t __swap16gen_x = (x); \ 57 \ 58 (__uint16_t)((__swap16gen_x & 0xff) << 8 | \ 59 (__swap16gen_x & 0xff00) >> 8); \ 60}) 61 62#define __swap32gen(x) __statement({ \ 63 __uint32_t __swap32gen_x = (x); \ 64 \ 65 (__uint32_t)((__swap32gen_x & 0xff) << 24 | \ 66 (__swap32gen_x & 0xff00) << 8 | \ 67 (__swap32gen_x & 0xff0000) >> 8 | \ 68 (__swap32gen_x & 0xff000000) >> 24); \ 69}) 70 71#define __swap64gen(x) __statement({ \ 72 __uint64_t __swap64gen_x = (x); \ 73 \ 74 (__uint64_t)((__swap64gen_x & 0xff) << 56 | \ 75 (__swap64gen_x & 0xff00ULL) << 40 | \ 76 (__swap64gen_x & 0xff0000ULL) << 24 | \ 77 (__swap64gen_x & 0xff000000ULL) << 8 | \ 78 (__swap64gen_x & 0xff00000000ULL) >> 8 | \ 79 (__swap64gen_x & 0xff0000000000ULL) >> 24 | \ 80 (__swap64gen_x & 0xff000000000000ULL) >> 40 | \ 81 (__swap64gen_x & 0xff00000000000000ULL) >> 56); \ 82}) 83 84#else /* __GNUC__ */ 85 86/* Note that these macros evaluate their arguments several times. */ 87#define __swap16gen(x) \ 88 (__uint16_t)(((__uint16_t)(x) & 0xff) << 8 | ((__uint16_t)(x) & 0xff00) >> 8) 89 90#define __swap32gen(x) \ 91 (__uint32_t)(((__uint32_t)(x) & 0xff) << 24 | \ 92 ((__uint32_t)(x) & 0xff00) << 8 | ((__uint32_t)(x) & 0xff0000) >> 8 |\ 93 ((__uint32_t)(x) & 0xff000000) >> 24) 94 95#define __swap64gen(x) \ 96 (__uint64_t)((((__uint64_t)(x) & 0xff) << 56) | \ 97 ((__uint64_t)(x) & 0xff00ULL) << 40 | \ 98 ((__uint64_t)(x) & 0xff0000ULL) << 24 | \ 99 ((__uint64_t)(x) & 0xff000000ULL) << 8 | \ 100 ((__uint64_t)(x) & 0xff00000000ULL) >> 8 | \ 101 ((__uint64_t)(x) & 0xff0000000000ULL) >> 24 | \ 102 ((__uint64_t)(x) & 0xff000000000000ULL) >> 40 | \ 103 ((__uint64_t)(x) & 0xff00000000000000ULL) >> 56) 104 105#endif /* __GNUC__ */ 106 107/* 108 * Define MD_SWAP if you provide swap{16,32}md functions/macros that are 109 * optimized for your architecture, These will be used for swap{16,32} 110 * unless the argument is a constant and we are using GCC, where we can 111 * take advantage of the CSE phase much better by using the generic version. 112 */ 113#ifdef MD_SWAP 114#if __GNUC__ 115 116#define __swap16(x) __statement({ \ 117 __uint16_t __swap16_x = (x); \ 118 \ 119 __builtin_constant_p(x) ? __swap16gen(__swap16_x) : \ 120 __swap16md(__swap16_x); \ 121}) 122 123#define __swap32(x) __statement({ \ 124 __uint32_t __swap32_x = (x); \ 125 \ 126 __builtin_constant_p(x) ? __swap32gen(__swap32_x) : \ 127 __swap32md(__swap32_x); \ 128}) 129 130#define __swap64(x) __statement({ \ 131 __uint64_t __swap64_x = (x); \ 132 \ 133 __builtin_constant_p(x) ? __swap64gen(__swap64_x) : \ 134 __swap64md(__swap64_x); \ 135}) 136 137#endif /* __GNUC__ */ 138 139#else /* MD_SWAP */ 140#define __swap16 __swap16gen 141#define __swap32 __swap32gen 142#define __swap64 __swap64gen 143#endif /* MD_SWAP */ 144 145#define __swap16_multi(v, n) do { \ 146 __size_t __swap16_multi_n = (n); \ 147 __uint16_t *__swap16_multi_v = (v); \ 148 \ 149 while (__swap16_multi_n) { \ 150 *__swap16_multi_v = swap16(*__swap16_multi_v); \ 151 __swap16_multi_v++; \ 152 __swap16_multi_n--; \ 153 } \ 154} while (0) 155 156#if __BSD_VISIBLE 157#define swap16 __swap16 158#define swap32 __swap32 159#define swap64 __swap64 160#define swap16_multi __swap16_multi 161 162__BEGIN_DECLS 163__uint64_t htobe64(__uint64_t); 164__uint32_t htobe32(__uint32_t); 165__uint16_t htobe16(__uint16_t); 166__uint64_t betoh64(__uint64_t); 167__uint32_t betoh32(__uint32_t); 168__uint16_t betoh16(__uint16_t); 169 170__uint64_t htole64(__uint64_t); 171__uint32_t htole32(__uint32_t); 172__uint16_t htole16(__uint16_t); 173__uint64_t letoh64(__uint64_t); 174__uint32_t letoh32(__uint32_t); 175__uint16_t letoh16(__uint16_t); 176__END_DECLS 177#endif /* __BSD_VISIBLE */ 178 179#if _BYTE_ORDER == _LITTLE_ENDIAN 180 181/* Can be overridden by machine/endian.h before inclusion of this file. */ 182#ifndef _QUAD_HIGHWORD 183#define _QUAD_HIGHWORD 1 184#endif 185#ifndef _QUAD_LOWWORD 186#define _QUAD_LOWWORD 0 187#endif 188 189#if __BSD_VISIBLE 190#define htobe16 __swap16 191#define htobe32 __swap32 192#define htobe64 __swap64 193#define betoh16 __swap16 194#define betoh32 __swap32 195#define betoh64 __swap64 196 197#define htole16(x) (x) 198#define htole32(x) (x) 199#define htole64(x) (x) 200#define letoh16(x) (x) 201#define letoh32(x) (x) 202#define letoh64(x) (x) 203#endif /* __BSD_VISIBLE */ 204 205#define htons(x) __swap16(x) 206#define htonl(x) __swap32(x) 207#define ntohs(x) __swap16(x) 208#define ntohl(x) __swap32(x) 209 210/* Bionic additions */ 211#define ntohq(x) __swap64(x) 212#define htonq(x) __swap64(x) 213 214#define __LITTLE_ENDIAN_BITFIELD 215 216#endif /* _BYTE_ORDER */ 217 218#if _BYTE_ORDER == _BIG_ENDIAN 219 220/* Can be overridden by machine/endian.h before inclusion of this file. */ 221#ifndef _QUAD_HIGHWORD 222#define _QUAD_HIGHWORD 0 223#endif 224#ifndef _QUAD_LOWWORD 225#define _QUAD_LOWWORD 1 226#endif 227 228#if __BSD_VISIBLE 229#define htole16 __swap16 230#define htole32 __swap32 231#define htole64 __swap64 232#define letoh16 __swap16 233#define letoh32 __swap32 234#define letoh64 __swap64 235 236#define htobe16(x) (x) 237#define htobe32(x) (x) 238#define htobe64(x) (x) 239#define betoh16(x) (x) 240#define betoh32(x) (x) 241#define betoh64(x) (x) 242#endif /* __BSD_VISIBLE */ 243 244#define htons(x) (x) 245#define htonl(x) (x) 246#define ntohs(x) (x) 247#define ntohl(x) (x) 248 249/* Bionic additions */ 250#define ntohq(x) (x) 251#define htonq(x) (x) 252 253#define __BIG_ENDIAN_BITFIELD 254 255#endif /* _BYTE_ORDER */ 256 257#if __BSD_VISIBLE 258#define NTOHL(x) (x) = ntohl((u_int32_t)(x)) 259#define NTOHS(x) (x) = ntohs((u_int16_t)(x)) 260#define HTONL(x) (x) = htonl((u_int32_t)(x)) 261#define HTONS(x) (x) = htons((u_int16_t)(x)) 262#endif 263 264 265#define __BYTE_ORDER _BYTE_ORDER 266#ifndef __LITTLE_ENDIAN 267#define __LITTLE_ENDIAN _LITTLE_ENDIAN 268#endif 269#ifndef __BIG_ENDIAN 270#define __BIG_ENDIAN _BIG_ENDIAN 271#endif 272 273#endif /* _SYS_ENDIAN_H_ */ 274