1 /* 2 * Copyright (c) 1999, 2019, 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_BYTES_BSD_X86_INLINE_HPP 26 #define OS_CPU_BSD_X86_BYTES_BSD_X86_INLINE_HPP 27 28 #ifdef __APPLE__ 29 #include <libkern/OSByteOrder.h> 30 #endif 31 32 #if defined(AMD64) 33 # if defined(__APPLE__) 34 # define bswap_16(x) OSSwapInt16(x) 35 # define bswap_32(x) OSSwapInt32(x) 36 # define bswap_64(x) OSSwapInt64(x) 37 # elif defined(__OpenBSD__) 38 # define bswap_16(x) swap16(x) 39 # define bswap_32(x) swap32(x) 40 # define bswap_64(x) swap64(x) 41 # elif defined(__NetBSD__) 42 # define bswap_16(x) bswap16(x) 43 # define bswap_32(x) bswap32(x) 44 # define bswap_64(x) bswap64(x) 45 # else 46 # define bswap_16(x) __bswap16(x) 47 # define bswap_32(x) __bswap32(x) 48 # define bswap_64(x) __bswap64(x) 49 # endif 50 #endif 51 52 // Efficient swapping of data bytes from Java byte 53 // ordering to native byte ordering and vice versa. 54 inline u2 Bytes::swap_u2(u2 x) { 55 #ifdef AMD64 56 return bswap_16(x); 57 #else 58 u2 ret; 59 __asm__ __volatile__ ( 60 "movw %0, %%ax;" 61 "xchg %%al, %%ah;" 62 "movw %%ax, %0" 63 :"=r" (ret) // output : register 0 => ret 64 :"0" (x) // input : x => register 0 65 :"ax", "0" // clobbered registers 66 ); 67 return ret; 68 #endif // AMD64 69 } 70 71 inline u4 Bytes::swap_u4(u4 x) { 72 #ifdef AMD64 73 return bswap_32(x); 74 #else 75 u4 ret; 76 __asm__ __volatile__ ( 77 "bswap %0" 78 :"=r" (ret) // output : register 0 => ret 79 :"0" (x) // input : x => register 0 80 :"0" // clobbered register 81 ); 82 return ret; 83 #endif // AMD64 84 } 85 86 #ifdef AMD64 87 inline u8 Bytes::swap_u8(u8 x) { 88 #ifdef SPARC_WORKS 89 // workaround for SunStudio12 CR6615391 90 __asm__ __volatile__ ( 91 "bswapq %0" 92 :"=r" (x) // output : register 0 => x 93 :"0" (x) // input : x => register 0 94 :"0" // clobbered register 95 ); 96 return x; 97 #else 98 return bswap_64(x); 99 #endif 100 } 101 #else 102 // Helper function for swap_u8 103 inline u8 Bytes::swap_u8_base(u4 x, u4 y) { 104 return (((u8)swap_u4(x))<<32) | swap_u4(y); 105 } 106 107 inline u8 Bytes::swap_u8(u8 x) { 108 return swap_u8_base(*(u4*)&x, *(((u4*)&x)+1)); 109 } 110 #endif // !AMD64 111 112 #endif // OS_CPU_BSD_X86_BYTES_BSD_X86_INLINE_HPP