1 /* $OpenBSD: endian.h,v 1.3 2005/12/13 00:35:23 millert Exp $ */
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 */
31 #ifndef _ARM_ENDIAN_H_
32 #define _ARM_ENDIAN_H_
34 #ifdef __GNUC__
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 })
53 #define __swap32md(x) ({ \
54 register u_int32_t _x = (x); \
55 __asm__ __volatile__("rev %0, %0" : "+l" (_x)); \
56 _x; \
57 })
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 })
65 /* Tell sys/endian.h we have MD variants of the swap macros. */
66 #define MD_SWAP
68 #endif /* __GNUC__ */
70 #define _BYTE_ORDER _LITTLE_ENDIAN
71 #define __STRICT_ALIGNMENT
72 #include <sys/types.h>
73 #include <sys/endian.h>
75 #endif /* !_ARM_ENDIAN_H_ */