ndk/platforms/android-19/arch-arm/usr/include/machine/endian.h

   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 /*
  37  * REV and REV16 weren't available on ARM5 or ARM4.
  38  * We don't include <machine/cpu-features.h> because it pollutes the
  39  * namespace with macros like PLD.
  40  */
  41 #if !defined __ARM_ARCH_5__ && !defined __ARM_ARCH_5T__ && \
  42     !defined __ARM_ARCH_5TE__ && !defined __ARM_ARCH_5TEJ__ && \
  43     !defined __ARM_ARCH_4T__ && !defined __ARM_ARCH_4__
  44
  45 /* According to RealView Assembler User's Guide, REV and REV16 are available
  46  * in Thumb code and 16-bit instructions when used in Thumb-2 code.
  47  *
  48  * REV Rd, Rm
  49  *   Rd and Rm must both be Lo registers.
  50  *
  51  * REV16 Rd, Rm
  52  *   Rd and Rm must both be Lo registers.
  53  *
  54  * The +l constraint takes care of this without constraining us in ARM mode.
  55  */
  56 #define __swap16md(x) ({                                        \
  57     register u_int16_t _x = (x);                                \
  58     __asm volatile ("rev16 %0, %0" : "+l" (_x));                \
  59     _x;                                                         \
  60 })
  61
  62 #define __swap32md(x) ({                                        \
  63     register u_int32_t _x = (x);                                \
  64     __asm volatile ("rev %0, %0" : "+l" (_x));                  \
  65     _x;                                                         \
  66 })
  67
  68 #define __swap64md(x) ({                                        \
  69     u_int64_t _swap64md_x = (x);                                \
  70     (u_int64_t) __swap32md(_swap64md_x >> 32) |                 \
  71         (u_int64_t) __swap32md(_swap64md_x & 0xffffffff) << 32; \
  72 })
  73
  74 /* Tell sys/endian.h we have MD variants of the swap macros.  */
  75 #define MD_SWAP
  76
  77 #endif  /* __ARM_ARCH__ */
  78 #endif  /* __GNUC__ */
  79
  80 #if defined(__ARMEB__)
  81 #define _BYTE_ORDER _BIG_ENDIAN
  82 #else
  83 #define _BYTE_ORDER _LITTLE_ENDIAN
  84 #endif
  85 #define __STRICT_ALIGNMENT
  86 #include <sys/types.h>
  87 #include <sys/endian.h>
  88
  89 #endif  /* !_ARM_ENDIAN_H_ */