ndk/android-ndk-r4/linux/platforms/android-5/arch-x86/usr/include/endian.h

   1 /*      $OpenBSD: endian.h,v 1.14 2005/12/13 00:35:23 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 #ifndef _I386_ENDIAN_H_
  28 #define _I386_ENDIAN_H_
  29
  30 #ifdef __GNUC__
  31
  32 #if defined(_KERNEL) && !defined(I386_CPU)
  33 #define __swap32md(x) ({                                                \
  34         u_int32_t __swap32md_x = (x);                                   \
  35                                                                         \
  36         __asm ("bswap %1" : "+r" (__swap32md_x));                       \
  37         __swap32md_x;                                                   \
  38 })
  39 #else
  40 #define __swap32md(x) ({                                                \
  41         u_int32_t __swap32md_x = (x);                                   \
  42                                                                         \
  43         __asm ("rorw $8, %w1; rorl $16, %1; rorw $8, %w1" :             \
  44             "+r" (__swap32md_x));                                       \
  45         __swap32md_x;                                                   \
  46 })
  47 #endif  /* _KERNEL && !I386_CPU */
  48
  49 #define __swap64md(x) ({                                                \
  50         u_int64_t __swap64md_x = (x);                                   \
  51                                                                         \
  52         (u_int64_t)__swap32md(__swap64md_x >> 32) |                     \
  53             (u_int64_t)__swap32md(__swap64md_x & 0xffffffff) << 32;     \
  54 })
  55 #define __swap16md(x) ({                                                \
  56         u_int16_t __swap16md_x = (x);                                   \
  57                                                                         \
  58         __asm ("rorw $8, %w1" : "+r" (__swap16md_x));                   \
  59         __swap16md_x;                                                   \
  60 })
  61
  62 /* Tell sys/endian.h we have MD variants of the swap macros.  */
  63 #define MD_SWAP
  64
  65 #endif  /* __GNUC__ */
  66
  67 #define _BYTE_ORDER _LITTLE_ENDIAN
  68 #include <sys/endian.h>
  69
  70 #endif /* _I386_ENDIAN_H_ */