1 /* $OpenBSD: endian.h,v 1.3 2005/12/13 00:35:23 millert Exp $ */ 2 3 /* 4 * Copyright (C) 2010 The Android Open Source Project 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * * Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * * Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in 14 * the documentation and/or other materials provided with the 15 * distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 20 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 21 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 23 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 24 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 25 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 27 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #ifndef _ARM_ENDIAN_H_ 32 #define _ARM_ENDIAN_H_ 33 34 #ifdef __GNUC__ 35 36 /* According to RealView Assembler User's Guide, REV and REV16 are available 37 * in Thumb code and 16-bit instructions when used in Thumb-2 code. 38 * 39 * REV Rd, Rm 40 * Rd and Rm must both be Lo registers. 41 * 42 * REV16 Rd, Rm 43 * Rd and Rm must both be Lo registers. 44 * 45 * The +l constraint takes care of this without constraining us in ARM mode. 46 */ 47 #define __swap16md(x) ({ \ 48 register u_int16_t _x = (x); \ 49 __asm__ __volatile__("rev16 %0, %0" : "+l" (_x)); \ 50 _x; \ 51 }) 52 53 #define __swap32md(x) ({ \ 54 register u_int32_t _x = (x); \ 55 __asm__ __volatile__("rev %0, %0" : "+l" (_x)); \ 56 _x; \ 57 }) 58 59 #define __swap64md(x) ({ \ 60 u_int64_t _swap64md_x = (x); \ 61 (u_int64_t) __swap32md(_swap64md_x >> 32) | \ 62 (u_int64_t) __swap32md(_swap64md_x & 0xffffffff) << 32; \ 63 }) 64 65 /* Tell sys/endian.h we have MD variants of the swap macros. */ 66 #define MD_SWAP 67 68 #endif /* __GNUC__ */ 69 70 #if defined(__ARMEB__) 71 #define _BYTE_ORDER _BIG_ENDIAN 72 #else 73 #define _BYTE_ORDER _LITTLE_ENDIAN 74 #endif 75 #define __STRICT_ALIGNMENT 76 #include <sys/types.h> 77 #include <sys/endian.h> 78 79 #endif /* !_ARM_ENDIAN_H_ */ 80