1 /*
2 * Copyright (c) 1999, 2020, 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_HPP
26 #define OS_CPU_BSD_X86_BYTES_BSD_X86_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.
swap_u2(u2 x)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
swap_u4(u4 x)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
swap_u8(u8 x)87 inline u8 Bytes::swap_u8(u8 x) {
88 return bswap_64(x);
89 }
90 #else
91 // Helper function for swap_u8
swap_u8_base(u4 x,u4 y)92 inline u8 Bytes::swap_u8_base(u4 x, u4 y) {
93 return (((u8)swap_u4(x))<<32) | swap_u4(y);
94 }
95
swap_u8(u8 x)96 inline u8 Bytes::swap_u8(u8 x) {
97 return swap_u8_base(*(u4*)&x, *(((u4*)&x)+1));
98 }
99 #endif // !AMD64
100
101 #endif // OS_CPU_BSD_X86_BYTES_BSD_X86_HPP
102