1 /*
   2  * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef OS_CPU_BSD_X86_VM_BYTES_BSD_X86_INLINE_HPP
  26 #define OS_CPU_BSD_X86_VM_BYTES_BSD_X86_INLINE_HPP
  27 
  28 #ifndef _ALLBSD_SOURCE
  29 #include <byteswap.h>
  30 #endif
  31 
  32 #ifdef __APPLE__
  33 #include <libkern/OSByteOrder.h>
  34 #endif
  35 
  36 #if defined(AMD64)
  37 #  if defined(__APPLE__)
  38 #    define bswap_16(x) OSSwapInt16(x)
  39 #    define bswap_32(x) OSSwapInt32(x)
  40 #    define bswap_64(x) OSSwapInt64(x)
  41 #  elif defined(__OpenBSD__)
  42 #    define bswap_16(x) swap16(x)
  43 #    define bswap_32(x) swap32(x)
  44 #    define bswap_64(x) swap64(x)
  45 #  elif defined(__NetBSD__)
  46 #    define bswap_16(x) bswap16(x)
  47 #    define bswap_32(x) bswap32(x)
  48 #    define bswap_64(x) bswap64(x)
  49 #  else
  50 #    define bswap_16(x) __bswap16(x)
  51 #    define bswap_32(x) __bswap32(x)
  52 #    define bswap_64(x) __bswap64(x)
  53 #  endif
  54 #endif
  55 
  56 // Efficient swapping of data bytes from Java byte
  57 // ordering to native byte ordering and vice versa.
  58 inline u2   Bytes::swap_u2(u2 x) {
  59 #ifdef AMD64
  60   return bswap_16(x);
  61 #else
  62   u2 ret;
  63   __asm__ __volatile__ (
  64     "movw %0, %%ax;"
  65     "xchg %%al, %%ah;"
  66     "movw %%ax, %0"
  67     :"=r" (ret)      // output : register 0 => ret
  68     :"0"  (x)        // input  : x => register 0
  69     :"ax", "0"       // clobbered registers
  70   );
  71   return ret;
  72 #endif // AMD64
  73 }
  74 
  75 inline u4   Bytes::swap_u4(u4 x) {
  76 #ifdef AMD64
  77   return bswap_32(x);
  78 #else
  79   u4 ret;
  80   __asm__ __volatile__ (
  81     "bswap %0"
  82     :"=r" (ret)      // output : register 0 => ret
  83     :"0"  (x)        // input  : x => register 0
  84     :"0"             // clobbered register
  85   );
  86   return ret;
  87 #endif // AMD64
  88 }
  89 
  90 #ifdef AMD64
  91 inline u8 Bytes::swap_u8(u8 x) {
  92 #ifdef SPARC_WORKS
  93   // workaround for SunStudio12 CR6615391
  94   __asm__ __volatile__ (
  95     "bswapq %0"
  96     :"=r" (x)        // output : register 0 => x
  97     :"0"  (x)        // input  : x => register 0
  98     :"0"             // clobbered register
  99   );
 100   return x;
 101 #else
 102   return bswap_64(x);
 103 #endif
 104 }
 105 #else
 106 // Helper function for swap_u8
 107 inline u8   Bytes::swap_u8_base(u4 x, u4 y) {
 108   return (((u8)swap_u4(x))<<32) | swap_u4(y);
 109 }
 110 
 111 inline u8 Bytes::swap_u8(u8 x) {
 112   return swap_u8_base(*(u4*)&x, *(((u4*)&x)+1));
 113 }
 114 #endif // !AMD64
 115 
 116 #endif // OS_CPU_BSD_X86_VM_BYTES_BSD_X86_INLINE_HPP