1 /* 2 * Copyright (c) 1998, 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_SOLARIS_X86_VM_BYTES_SOLARIS_X86_INLINE_HPP 26 #define OS_CPU_SOLARIS_X86_VM_BYTES_SOLARIS_X86_INLINE_HPP 27 28 // For Sun Studio - implementation is in solaris_i486.il. 29 // For gcc - implementation is just below. 30 extern "C" u2 _raw_swap_u2(u2 x); 31 extern "C" u4 _raw_swap_u4(u4 x); 32 #ifdef AMD64 33 extern "C" u8 _raw_swap_u8(u8 x); 34 #else 35 extern "C" u8 _raw_swap_u8(u4 x, u4 y); 36 #endif // AMD64 37 38 // Efficient swapping of data bytes from Java byte 39 // ordering to native byte ordering and vice versa. 40 inline u2 Bytes::swap_u2(u2 x) { 41 return _raw_swap_u2(x); 42 } 43 44 inline u4 Bytes::swap_u4(u4 x) { 45 return _raw_swap_u4(x); 46 } 47 48 inline u8 Bytes::swap_u8(u8 x) { 49 #ifdef AMD64 50 return _raw_swap_u8(x); 51 #else 52 return swap_u8_base(*(u4*)&x, *(((u4*)&x)+1)); 53 #endif // AMD64 54 55 } 56 57 #ifndef AMD64 58 // Helper function for swap_u8 59 inline u8 Bytes::swap_u8_base(u4 x, u4 y) { 60 return _raw_swap_u8(x, y); 61 } 62 #endif // !AMD64 63 64 65 #ifdef _GNU_SOURCE 66 67 extern "C" { 68 #ifdef AMD64 69 inline u2 _raw_swap_u2(u2 x) { 70 register unsigned short int __dest; 71 __asm__ ("rorw $8, %w0": "=r" (__dest): "0" (x): "cc"); 72 return __dest; 73 } 74 inline u4 _raw_swap_u4(u4 x) { 75 register unsigned int __dest; 76 __asm__ ("bswap %0" : "=r" (__dest) : "0" (x)); 77 return __dest; 78 } 79 inline u8 _raw_swap_u8(u8 x) { 80 register unsigned long __dest; 81 __asm__ ("bswap %q0" : "=r" (__dest) : "0" (x)); 82 return __dest; 83 } 84 #else 85 inline u2 _raw_swap_u2(u2 x) { 86 u2 ret; 87 __asm__ __volatile__ ( 88 "movw %0, %%ax;" 89 "xchg %%al, %%ah;" 90 "movw %%ax, %0" 91 :"=r" (ret) // output : register 0 => ret 92 :"0" (x) // input : x => register 0 93 :"ax", "0" // clobbered registers 94 ); 95 return ret; 96 } 97 98 inline u4 _raw_swap_u4(u4 x) { 99 u4 ret; 100 __asm__ __volatile__ ( 101 "bswap %0" 102 :"=r" (ret) // output : register 0 => ret 103 :"0" (x) // input : x => register 0 104 :"0" // clobbered register 105 ); 106 return ret; 107 } 108 109 inline u8 _raw_swap_u8(u4 x, u4 y) { 110 return (((u8)_raw_swap_u4(x))<<32) | _raw_swap_u4(y); 111 } 112 #endif // AMD64 113 } 114 #endif //_GNU_SOURCE 115 116 #endif // OS_CPU_SOLARIS_X86_VM_BYTES_SOLARIS_X86_INLINE_HPP