1 /*
2 * IDI,NTNU
3 *
4 * CDDL HEADER START
5 *
6 * The contents of this file are subject to the terms of the
7 * Common Development and Distribution License (the "License").
8 * You may not use this file except in compliance with the License.
9 *
10 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
11 * or http://opensource.org/licenses/CDDL-1.0.
12 * See the License for the specific language governing permissions
13 * and limitations under the License.
14 *
15 * When distributing Covered Code, include this CDDL HEADER in each
16 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
17 * If applicable, add the following below this CDDL HEADER, with the
18 * fields enclosed by brackets "[]" replaced with your own identifying
19 * information: Portions Copyright [yyyy] [name of copyright owner]
20 *
21 * CDDL HEADER END
22 *
23 * Copyright (C) 2009, 2010, Jorn Amundsen <jorn.amundsen@ntnu.no>
24 *
25 * C header file to determine compile machine byte order. Take care when cross
26 * compiling.
27 *
28 * $Id: byteorder.h 517 2013-02-17 20:34:39Z joern $
29 */
30 /*
31 * Portions copyright (c) 2013, Saso Kiselkov, All rights reserved
32 */
33
34 #if !defined(BYTEORDER_INCLUDED)
35
36 #if defined(__linux)
37 #include <endian.h>
38 #else
39 #include <sys/param.h>
40 #endif
41
42 #if defined(__BYTE_ORDER)
43 #if (__BYTE_ORDER == __BIG_ENDIAN)
44 #define MACHINE_IS_BIG_ENDIAN
45 #elif (__BYTE_ORDER == __LITTLE_ENDIAN)
46 #define MACHINE_IS_LITTLE_ENDIAN
47 #endif
48 #elif defined(BYTE_ORDER)
49 #if (BYTE_ORDER == BIG_ENDIAN)
50 #define MACHINE_IS_BIG_ENDIAN
51 #elif (BYTE_ORDER == LITTLE_ENDIAN)
52 #define MACHINE_IS_LITTLE_ENDIAN
53 #endif
54 #endif /* __BYTE_ORDER || BYTE_ORDER */
55
56 #if !defined(MACHINE_IS_BIG_ENDIAN) && !defined(MACHINE_IS_LITTLE_ENDIAN)
57 #if defined(_BIG_ENDIAN) || defined(_MIPSEB)
58 #define MACHINE_IS_BIG_ENDIAN
59 #endif
60 #if defined(_LITTLE_ENDIAN) || defined(_MIPSEL)
61 #define MACHINE_IS_LITTLE_ENDIAN
62 #endif
63 #endif /* !MACHINE_IS_BIG_ENDIAN && !MACHINE_IS_LITTLE_ENDIAN */
64
65 #if !defined(MACHINE_IS_BIG_ENDIAN) && !defined(MACHINE_IS_LITTLE_ENDIAN)
66 #error unknown machine byte sex
67 #endif
68
69 #define BYTEORDER_INCLUDED
70
71 #if defined(MACHINE_IS_BIG_ENDIAN)
72 /*
73 * Byte swapping macros for big endian architectures and compilers,
74 * add as appropriate for other architectures and/or compilers.
75 *
76 * ld_swap64(src,dst) : uint64_t dst = *(src)
77 * st_swap64(src,dst) : *(dst) = uint64_t src
78 */
79
80 #if defined(__PPC__) || defined(_ARCH_PPC)
81
82 #if defined(__64BIT__)
83 #if defined(_ARCH_PWR7)
84 #define aix_ld_swap64(s64, d64)\
85 __asm__("ldbrx %0,0,%1" : "=r"(d64) : "r"(s64))
86 #define aix_st_swap64(s64, d64)\
87 __asm__ volatile("stdbrx %1,0,%0" : : "r"(d64), "r"(s64))
88 #else
89 #define aix_ld_swap64(s64, d64) \
90 { \
91 uint64_t *s4, h; \
92 \
93 __asm__("addi %0,%3,4;lwbrx %1,0,%3;lwbrx %2,0,%0;rldimi %1,%2,32,0"\
94 : "+r"(s4), "=r"(d64), "=r"(h) : "b"(s64)); \
95 }
96
97 #define aix_st_swap64(s64, d64) \
98 { \
99 uint64_t *s4, h; \
100 h = (s64) >> 32; \
101 __asm__ volatile("addi %0,%3,4;stwbrx %1,0,%3;stwbrx %2,0,%0" \
102 : "+r"(s4) : "r"(s64), "r"(h), "b"(d64)); \
103 }
104 #endif /* 64BIT && PWR7 */
105 #else
106 #define aix_ld_swap64(s64, d64) \
107 { \
108 uint32_t *s4, h, l; \
109 __asm__("addi %0,%3,4;lwbrx %1,0,%3;lwbrx %2,0,%0" \
110 : "+r"(s4), "=r"(l), "=r"(h) : "b"(s64)); \
111 d64 = ((uint64_t)h<<32) | l; \
112 }
113
114 #define aix_st_swap64(s64, d64) \
115 { \
116 uint32_t *s4, h, l; \
117 l = (s64) & 0xfffffffful, h = (s64) >> 32; \
118 __asm__ volatile("addi %0,%3,4;stwbrx %1,0,%3;stwbrx %2,0,%0" \
119 : "+r"(s4) : "r"(l), "r"(h), "b"(d64)); \
120 }
121 #endif /* __64BIT__ */
122 #define aix_ld_swap32(s32, d32)\
123 __asm__("lwbrx %0,0,%1" : "=r"(d32) : "r"(s32))
124 #define aix_st_swap32(s32, d32)\
125 __asm__ volatile("stwbrx %1,0,%0" : : "r"(d32), "r"(s32))
126 #define ld_swap32(s, d) aix_ld_swap32(s, d)
127 #define st_swap32(s, d) aix_st_swap32(s, d)
128 #define ld_swap64(s, d) aix_ld_swap64(s, d)
129 #define st_swap64(s, d) aix_st_swap64(s, d)
130 #endif /* __PPC__ || _ARCH_PPC */
131
132 #if defined(__sparc)
133 #if !defined(__arch64__) && !defined(__sparcv8) && defined(__sparcv9)
134 #define __arch64__
135 #endif
136 #if defined(__GNUC__) || (defined(__SUNPRO_C) && __SUNPRO_C > 0x590)
137 /* need Sun Studio C 5.10 and above for GNU inline assembly */
138 #if defined(__arch64__)
139 #define sparc_ld_swap64(s64, d64) \
140 __asm__("ldxa [%1]0x88,%0" : "=r"(d64) : "r"(s64))
141 #define sparc_st_swap64(s64, d64) \
142 __asm__ volatile("stxa %0,[%1]0x88" : : "r"(s64), "r"(d64))
143 #define st_swap64(s, d) sparc_st_swap64(s, d)
144 #else
145 #define sparc_ld_swap64(s64, d64) \
146 { \
147 uint32_t *s4, h, l; \
148 __asm__("add %3,4,%0\n\tlda [%3]0x88,%1\n\tlda [%0]0x88,%2" \
149 : "+r"(s4), "=r"(l), "=r"(h) : "r"(s64)); \
150 d64 = ((uint64_t)h<<32) | l; \
151 }
152 #define sparc_st_swap64(s64, d64) \
153 { \
154 uint32_t *s4, h, l; \
155 l = (s64) & 0xfffffffful, h = (s64) >> 32; \
156 __asm__ volatile("add %3,4,%0\n\tsta %1,[%3]0x88\n\tsta %2,[%0]0x88"\
157 : "+r"(s4) : "r"(l), "r"(h), "r"(d64)); \
158 }
159 #endif /* sparc64 */
160 #define sparc_ld_swap32(s32, d32)\
161 __asm__("lda [%1]0x88,%0" : "=r"(d32) : "r"(s32))
162 #define sparc_st_swap32(s32, d32)\
163 __asm__ volatile("sta %0,[%1]0x88" : : "r"(s32), "r"(d32))
164 #define ld_swap32(s, d) sparc_ld_swap32(s, d)
165 #define st_swap32(s, d) sparc_st_swap32(s, d)
166 #define ld_swap64(s, d) sparc_ld_swap64(s, d)
167 #define st_swap64(s, d) sparc_st_swap64(s, d)
168 #endif /* GCC || Sun Studio C > 5.9 */
169 #endif /* sparc */
170
171 /* GCC fallback */
172 #if ((__GNUC__ >= 4) || defined(__PGIC__)) && !defined(ld_swap32)
173 #define ld_swap32(s, d) (d = __builtin_bswap32(*(s)))
174 #define st_swap32(s, d) (*(d) = __builtin_bswap32(s))
175 #endif /* GCC4/PGIC && !swap32 */
176 #if ((__GNUC__ >= 4) || defined(__PGIC__)) && !defined(ld_swap64)
177 #define ld_swap64(s, d) (d = __builtin_bswap64(*(s)))
178 #define st_swap64(s, d) (*(d) = __builtin_bswap64(s))
179 #endif /* GCC4/PGIC && !swap64 */
180
181 /* generic fallback */
182 #if !defined(ld_swap32)
183 #define ld_swap32(s, d) \
184 (d = (*(s) >> 24) | (*(s) >> 8 & 0xff00) | \
185 (*(s) << 8 & 0xff0000) | (*(s) << 24))
186 #define st_swap32(s, d) \
187 (*(d) = ((s) >> 24) | ((s) >> 8 & 0xff00) | \
188 ((s) << 8 & 0xff0000) | ((s) << 24))
189 #endif
190 #if !defined(ld_swap64)
191 #define ld_swap64(s, d) \
192 (d = (*(s) >> 56) | (*(s) >> 40 & 0xff00) | \
193 (*(s) >> 24 & 0xff0000) | (*(s) >> 8 & 0xff000000) | \
194 (*(s) & 0xff000000) << 8 | (*(s) & 0xff0000) << 24 | \
195 (*(s) & 0xff00) << 40 | *(s) << 56)
196 #define st_swap64(s, d) \
197 (*(d) = ((s) >> 56) | ((s) >> 40 & 0xff00) | \
198 ((s) >> 24 & 0xff0000) | ((s) >> 8 & 0xff000000) | \
199 ((s) & 0xff000000) << 8 | ((s) & 0xff0000) << 24 | \
200 ((s) & 0xff00) << 40 | (s) << 56)
201 #endif
202
203 #endif /* MACHINE_IS_BIG_ENDIAN */
204
205
206 #if defined(MACHINE_IS_LITTLE_ENDIAN)
207 /* replace swaps with simple assignments on little endian systems */
208 #undef ld_swap32
209 #undef st_swap32
210 #define ld_swap32(s, d) (d = *(s))
211 #define st_swap32(s, d) (*(d) = s)
212 #undef ld_swap64
213 #undef st_swap64
214 #define ld_swap64(s, d) (d = *(s))
215 #define st_swap64(s, d) (*(d) = s)
216 #endif /* MACHINE_IS_LITTLE_ENDIAN */
217
218 #endif /* BYTEORDER_INCLUDED */