1 /* $OpenBSD: endian.h,v 1.17 2011/03/12 04:03:04 guenther 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 #ifndef _MACHINE_ENDIAN_H_ 28 #define _MACHINE_ENDIAN_H_ 29 30 #ifdef __GNUC__ 31 32 #define __swap32md(x) __statement({ \ 33 uint32_t __swap32md_x = (x); \ 34 \ 35 __asm ("bswap %0" : "+r" (__swap32md_x)); \ 36 __swap32md_x; \ 37 }) 38 39 #define __swap64md(x) __statement({ \ 40 uint64_t __swap64md_x = (x); \ 41 \ 42 (uint64_t)__swap32md(__swap64md_x >> 32) | \ 43 (uint64_t)__swap32md(__swap64md_x & 0xffffffff) << 32; \ 44 }) 45 #define __swap16md(x) __statement({ \ 46 uint16_t __swap16md_x = (x); \ 47 \ 48 __asm ("rorw $8, %w0" : "+r" (__swap16md_x)); \ 49 __swap16md_x; \ 50 }) 51 52 /* Tell sys/endian.h we have MD variants of the swap macros. */ 53 #define MD_SWAP 54 55 #endif /* __GNUC__ */ 56 57 #define _BYTE_ORDER _LITTLE_ENDIAN 58 #include <sys/types.h> 59 #include <sys/endian.h> 60 61 #endif /* _MACHINE_ENDIAN_H_ */ 62