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3960
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1 /*
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2 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef OS_CPU_BSD_X86_VM_BYTES_BSD_X86_INLINE_HPP
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26 #define OS_CPU_BSD_X86_VM_BYTES_BSD_X86_INLINE_HPP
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27
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28 #ifndef _ALLBSD_SOURCE
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29 #include <byteswap.h>
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30 #endif
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31
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32 #ifdef __APPLE__
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33 #include <libkern/OSByteOrder.h>
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34 #endif
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35
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36 #if defined(AMD64)
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37 # if defined(__APPLE__)
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38 # define bswap_16(x) OSSwapInt16(x)
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39 # define bswap_32(x) OSSwapInt32(x)
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40 # define bswap_64(x) OSSwapInt64(x)
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41 # elif defined(__OpenBSD__)
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42 # define bswap_16(x) swap16(x)
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43 # define bswap_32(x) swap32(x)
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44 # define bswap_64(x) swap64(x)
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45 # elif defined(__NetBSD__)
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46 # define bswap_16(x) bswap16(x)
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47 # define bswap_32(x) bswap32(x)
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48 # define bswap_64(x) bswap64(x)
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49 # else
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50 # define bswap_16(x) __bswap16(x)
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51 # define bswap_32(x) __bswap32(x)
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52 # define bswap_64(x) __bswap64(x)
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53 # endif
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54 #endif
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55
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56 // Efficient swapping of data bytes from Java byte
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57 // ordering to native byte ordering and vice versa.
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58 inline u2 Bytes::swap_u2(u2 x) {
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59 #ifdef AMD64
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60 return bswap_16(x);
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61 #else
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62 u2 ret;
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63 __asm__ __volatile__ (
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64 "movw %0, %%ax;"
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65 "xchg %%al, %%ah;"
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66 "movw %%ax, %0"
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67 :"=r" (ret) // output : register 0 => ret
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68 :"0" (x) // input : x => register 0
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69 :"ax", "0" // clobbered registers
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70 );
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71 return ret;
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72 #endif // AMD64
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73 }
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74
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75 inline u4 Bytes::swap_u4(u4 x) {
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76 #ifdef AMD64
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77 return bswap_32(x);
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78 #else
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79 u4 ret;
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80 __asm__ __volatile__ (
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81 "bswap %0"
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82 :"=r" (ret) // output : register 0 => ret
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83 :"0" (x) // input : x => register 0
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84 :"0" // clobbered register
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85 );
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86 return ret;
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87 #endif // AMD64
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88 }
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89
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90 #ifdef AMD64
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91 inline u8 Bytes::swap_u8(u8 x) {
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92 #ifdef SPARC_WORKS
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93 // workaround for SunStudio12 CR6615391
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94 __asm__ __volatile__ (
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95 "bswapq %0"
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96 :"=r" (x) // output : register 0 => x
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97 :"0" (x) // input : x => register 0
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98 :"0" // clobbered register
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99 );
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100 return x;
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101 #else
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102 return bswap_64(x);
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103 #endif
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104 }
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105 #else
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106 // Helper function for swap_u8
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107 inline u8 Bytes::swap_u8_base(u4 x, u4 y) {
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108 return (((u8)swap_u4(x))<<32) | swap_u4(y);
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109 }
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110
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111 inline u8 Bytes::swap_u8(u8 x) {
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112 return swap_u8_base(*(u4*)&x, *(((u4*)&x)+1));
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113 }
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114 #endif // !AMD64
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115
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116 #endif // OS_CPU_BSD_X86_VM_BYTES_BSD_X86_INLINE_HPP
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