1 /* $NetBSD: atomic_op_asm.h,v 1.6 2021/07/29 10:29:05 skrll Exp $ */ 2 3 /*- 4 * Copyright (c) 2014 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Matt Thomas of 3am Software Foundry. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef _ATOMIC_OP_ASM_H_ 33 #define _ATOMIC_OP_ASM_H_ 34 35 #include <machine/asm.h> 36 37 #define ATOMIC_OP8(OP, INSN) \ 38 ENTRY_NP(_atomic_##OP##_8) ;\ 39 mov x4, x0 ;\ 40 1: ldxrb w0, [x4] /* load old value */ ;\ 41 INSN w2, w0, w1 /* calculate new value */ ;\ 42 stxrb w3, w2, [x4] /* try to store */ ;\ 43 cbnz w3, 1b /* succeed? no, try again */ ;\ 44 ret /* return old value */ ;\ 45 END(_atomic_##OP##_8) 46 47 #define SYNC_FETCH_OP8(OP, INSN) \ 48 ENTRY_NP(__sync_fetch_and_##OP##_1) ;\ 49 mov x4, x0 ;\ 50 dmb ish ;\ 51 1: ldxrb w0, [x4] /* load old value */ ;\ 52 INSN w2, w0, w1 /* calculate new value */ ;\ 53 stxrb w3, w2, [x4] /* try to store */ ;\ 54 cbnz w3, 1b /* succeed? no, try again */ ;\ 55 dmb ish ;\ 56 ret /* return old value */ ;\ 57 END(__sync_fetch_and_##OP##_1) 58 59 #define ATOMIC_OP8_NV(OP, INSN) \ 60 ENTRY_NP(_atomic_##OP##_8_nv) ;\ 61 mov x4, x0 /* need x0 for return value */ ;\ 62 1: ldxrb w0, [x4] /* load old value */ ;\ 63 INSN w0, w0, w1 /* calc new (return) value */ ;\ 64 stxrb w3, w0, [x4] /* try to store */ ;\ 65 cbnz w3, 1b /* succeed? no, try again */ ;\ 66 ret /* return new value */ ;\ 67 END(_atomic_##OP##_8_nv) 68 69 #define SYNC_OP8_FETCH(OP, INSN) \ 70 ENTRY_NP(__sync_##OP##_and_fetch_1) ;\ 71 mov x4, x0 /* need x0 for return value */ ;\ 72 dmb ish ;\ 73 1: ldxrb w0, [x4] /* load old value */ ;\ 74 INSN w0, w0, w1 /* calc new (return) value */ ;\ 75 stxrb w3, w0, [x4] /* try to store */ ;\ 76 cbnz w3, 1b /* succeed? no, try again */ ;\ 77 dmb ish ;\ 78 ret /* return new value */ ;\ 79 END(__sync_##OP##_and_fetch_1) 80 81 #define ATOMIC_OP16(OP, INSN) \ 82 ENTRY_NP(_atomic_##OP##_16) ;\ 83 mov x4, x0 ;\ 84 1: ldxrh w0, [x4] /* load old value */ ;\ 85 INSN w2, w0, w1 /* calculate new value */ ;\ 86 stxrh w3, w2, [x4] /* try to store */ ;\ 87 cbnz w3, 1b /* succeed? no, try again */ ;\ 88 ret /* return old value */ ;\ 89 END(_atomic_##OP##_16) 90 91 #define SYNC_FETCH_OP16(OP, INSN) \ 92 ENTRY_NP(__sync_fetch_and_##OP##_2) ;\ 93 mov x4, x0 ;\ 94 dmb ish ;\ 95 1: ldxrh w0, [x4] /* load old value */ ;\ 96 INSN w2, w0, w1 /* calculate new value */ ;\ 97 stxrh w3, w2, [x4] /* try to store */ ;\ 98 cbnz w3, 1b /* succeed? no, try again */ ;\ 99 dmb ish ;\ 100 ret /* return old value */ ;\ 101 END(__sync_fetch_and_##OP##_2) 102 103 #define ATOMIC_OP16_NV(OP, INSN) \ 104 ENTRY_NP(_atomic_##OP##_16_nv) ;\ 105 mov x4, x0 /* need x0 for return value */ ;\ 106 1: ldxrh w0, [x4] /* load old value */ ;\ 107 INSN w0, w0, w1 /* calc new (return) value */ ;\ 108 stxrh w3, w0, [x4] /* try to store */ ;\ 109 cbnz w3, 1b /* succeed? no, try again */ ;\ 110 ret /* return new value */ ;\ 111 END(_atomic_##OP##_16_nv) 112 113 #define SYNC_OP16_FETCH(OP, INSN) \ 114 ENTRY_NP(__sync__##OP##_and_fetch_2) ;\ 115 mov x4, x0 /* need x0 for return value */ ;\ 116 dmb ish ;\ 117 1: ldxrh w0, [x4] /* load old value */ ;\ 118 INSN w0, w0, w1 /* calc new (return) value */ ;\ 119 stxrh w3, w0, [x4] /* try to store */ ;\ 120 cbnz w3, 1b /* succeed? no, try again */ ;\ 121 dmb ish ;\ 122 ret /* return new value */ ;\ 123 END(__sync__##OP##_and_fetch_2) 124 125 #define ATOMIC_OP32(OP, INSN) \ 126 ENTRY_NP(_atomic_##OP##_32) ;\ 127 mov x4, x0 ;\ 128 1: ldxr w0, [x4] /* load old value */ ;\ 129 INSN w2, w0, w1 /* calculate new value */ ;\ 130 stxr w3, w2, [x4] /* try to store */ ;\ 131 cbnz w3, 1b /* succeed? no, try again */ ;\ 132 ret /* return old value */ ;\ 133 END(_atomic_##OP##_32) 134 135 #define SYNC_FETCH_OP32(OP, INSN) \ 136 ENTRY_NP(__sync_fetch_and_##OP##_4) ;\ 137 mov x4, x0 ;\ 138 dmb ish ;\ 139 1: ldxr w0, [x4] /* load old value */ ;\ 140 INSN w2, w0, w1 /* calculate new value */ ;\ 141 stxr w3, w2, [x4] /* try to store */ ;\ 142 cbnz w3, 1b /* succeed? no, try again */ ;\ 143 dmb ish ;\ 144 ret /* return old value */ ;\ 145 END(__sync_fetch_and_##OP##_4) 146 147 #define ATOMIC_OP32_NV(OP, INSN) \ 148 ENTRY_NP(_atomic_##OP##_32_nv) ;\ 149 mov x4, x0 /* need x0 for return value */ ;\ 150 1: ldxr w0, [x4] /* load old value */ ;\ 151 INSN w0, w0, w1 /* calc new (return) value */ ;\ 152 stxr w3, w0, [x4] /* try to store */ ;\ 153 cbnz w3, 1b /* succeed? no, try again? */ ;\ 154 ret /* return new value */ ;\ 155 END(_atomic_##OP##_32_nv) 156 157 #define SYNC_OP32_FETCH(OP, INSN) \ 158 ENTRY_NP(__sync__##OP##_and_fetch_4) ;\ 159 mov x4, x0 /* need x0 for return value */ ;\ 160 dmb ish ;\ 161 1: ldxr w0, [x4] /* load old value */ ;\ 162 INSN w0, w0, w1 /* calc new (return) value */ ;\ 163 stxr w3, w0, [x4] /* try to store */ ;\ 164 cbnz w3, 1b /* succeed? no, try again? */ ;\ 165 dmb ish ;\ 166 ret /* return new value */ ;\ 167 END(__sync__##OP##_and_fetch_4) 168 169 #define ATOMIC_OP64(OP, INSN) \ 170 ENTRY_NP(_atomic_##OP##_64) ;\ 171 mov x4, x0 ;\ 172 1: ldxr x0, [x4] /* load old value */ ;\ 173 INSN x2, x0, x1 /* calculate new value */ ;\ 174 stxr w3, x2, [x4] /* try to store */ ;\ 175 cbnz w3, 1b /* succeed? no, try again */ ;\ 176 ret /* return old value */ ;\ 177 END(_atomic_##OP##_64) 178 179 #define SYNC_FETCH_OP64(OP, INSN) \ 180 ENTRY_NP(__sync_fetch_and_##OP##_8) ;\ 181 mov x4, x0 ;\ 182 dmb ish ;\ 183 1: ldxr x0, [x4] /* load old value */ ;\ 184 INSN x2, x0, x1 /* calculate new value */ ;\ 185 stxr w3, x2, [x4] /* try to store */ ;\ 186 cbnz w3, 1b /* succeed? no, try again */ ;\ 187 dmb ish ;\ 188 ret /* return old value */ ;\ 189 END(__sync_fetch_and_##OP##_8) 190 191 #define ATOMIC_OP64_NV(OP, INSN) \ 192 ENTRY_NP(_atomic_##OP##_64_nv) ;\ 193 mov x4, x0 /* need x0 for return value */ ;\ 194 1: ldxr x0, [x4] /* load old value */ ;\ 195 INSN x0, x0, x1 /* calc new (return) value */ ;\ 196 stxr w3, x0, [x4] /* try to store */ ;\ 197 cbnz w3, 1b /* succeed? no, try again? */ ;\ 198 ret /* return new value */ ;\ 199 END(_atomic_##OP##_64_nv) 200 201 #define SYNC_OP64_FETCH(OP, INSN) \ 202 ENTRY_NP(__sync_##OP##_and_fetch_8) ;\ 203 mov x4, x0 /* need x0 for return value */ ;\ 204 dmb ish ;\ 205 1: ldxr x0, [x4] /* load old value */ ;\ 206 INSN x0, x0, x1 /* calc new (return) value */ ;\ 207 stxr w3, x0, [x4] /* try to store */ ;\ 208 cbnz w3, 1b /* succeed? no, try again? */ ;\ 209 dmb ish ;\ 210 ret /* return new value */ ;\ 211 END(__sync_##OP##_and_fetch_8) 212 213 #if defined(_KERNEL) 214 215 #define ATOMIC_OP_ALIAS(a,s) STRONG_ALIAS(a,s) 216 217 #else /* _KERNEL */ 218 219 #define ATOMIC_OP_ALIAS(a,s) WEAK_ALIAS(a,s) 220 221 #endif /* _KERNEL */ 222 223 #endif /* _ATOMIC_OP_ASM_H_ */ 224
Indexes created Sat Sep 20 22:09:52 GMT 2025