atomic_op_asm.h revision 1.2
1 /* $NetBSD: atomic_op_asm.h,v 1.2 2019/02/06 05:33:14 ryo 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 dmb st ;\ 45 ret /* return old value */ ;\ 46 END(_atomic_##OP##_8) 47 48 #define ATOMIC_OP8_NV(OP, INSN) \ 49 ENTRY_NP(_atomic_##OP##_8_nv) ;\ 50 mov x4, x0 /* need r0 for return value */ ;\ 51 1: ldxrb w0, [x4] /* load old value */ ;\ 52 INSN w2, w0, w1 /* calc new (return) value */ ;\ 53 stxrb w3, w2, [x4] /* try to store */ ;\ 54 cbnz w3, 1b /* succeed? no, try again */ ;\ 55 dmb st ;\ 56 ret /* return new value */ ;\ 57 END(_atomic_##OP##_8_nv) 58 59 #define ATOMIC_OP16(OP, INSN) \ 60 ENTRY_NP(_atomic_##OP##_16) ;\ 61 mov x4, x0 ;\ 62 1: ldxrh w0, [x4] /* load old value */ ;\ 63 INSN w2, w0, w1 /* calculate new value */ ;\ 64 stxrh w3, w2, [x4] /* try to store */ ;\ 65 cbnz w3, 1b /* succeed? no, try again */ ;\ 66 dmb st ;\ 67 ret /* return old value */ ;\ 68 END(_atomic_##OP##_16) 69 70 #define ATOMIC_OP16_NV(OP, INSN) \ 71 ENTRY_NP(_atomic_##OP##_16_nv) ;\ 72 mov x4, x0 /* need r0 for return value */ ;\ 73 1: ldxrh w0, [x4] /* load old value */ ;\ 74 INSN w2, w0, w1 /* calc new (return) value */ ;\ 75 stxrh w3, w2, [x4] /* try to store */ ;\ 76 cbnz w3, 1b /* succeed? no, try again */ ;\ 77 dmb st ;\ 78 ret /* return new value */ ;\ 79 END(_atomic_##OP##_16_nv) 80 81 #define ATOMIC_OP32(OP, INSN) \ 82 ENTRY_NP(_atomic_##OP##_32) ;\ 83 mov x4, x0 ;\ 84 1: ldxr w0, [x4] /* load old value */ ;\ 85 INSN w2, w0, w1 /* calculate new value */ ;\ 86 stxr w3, w2, [x4] /* try to store */ ;\ 87 cbnz w3, 1b /* succeed? no, try again */ ;\ 88 dmb st ;\ 89 ret /* return old value */ ;\ 90 END(_atomic_##OP##_32) 91 92 #define ATOMIC_OP32_NV(OP, INSN) \ 93 ENTRY_NP(_atomic_##OP##_32_nv) ;\ 94 mov x4, x0 /* need r0 for return value */ ;\ 95 1: ldxr w0, [x4] /* load old value */ ;\ 96 INSN w0, w0, w1 /* calc new (return) value */ ;\ 97 stxr w3, w0, [x4] /* try to store */ ;\ 98 cbnz w3, 1b /* succeed? no, try again? */ ;\ 99 dmb sy ;\ 100 ret /* return new value */ ;\ 101 END(_atomic_##OP##_32_nv) 102 103 #define ATOMIC_OP64(OP, INSN) \ 104 ENTRY_NP(_atomic_##OP##_64) ;\ 105 mov x4, x0 ;\ 106 1: ldxr x0, [x4] /* load old value */ ;\ 107 INSN x2, x0, x1 /* calculate new value */ ;\ 108 stxr w3, x2, [x4] /* try to store */ ;\ 109 cbnz w3, 1b /* succeed? no, try again */ ;\ 110 dmb st ;\ 111 ret /* return old value */ ;\ 112 END(_atomic_##OP##_64) 113 114 #define ATOMIC_OP64_NV(OP, INSN) \ 115 ENTRY_NP(_atomic_##OP##_64_nv) ;\ 116 mov x4, x0 /* need r0 for return value */ ;\ 117 1: ldxr x0, [x4] /* load old value */ ;\ 118 INSN x0, x0, x1 /* calc new (return) value */ ;\ 119 stxr w3, x0, [x4] /* try to store */ ;\ 120 cbnz w3, 1b /* succeed? no, try again? */ ;\ 121 dmb sy ;\ 122 ret /* return new value */ ;\ 123 END(_atomic_##OP##_64_nv) 124 125 #if defined(_KERNEL) 126 127 #define ATOMIC_OP_ALIAS(a,s) STRONG_ALIAS(a,s) 128 129 #else /* _KERNEL */ 130 131 #define ATOMIC_OP_ALIAS(a,s) WEAK_ALIAS(a,s) 132 133 #endif /* _KERNEL */ 134 135 #endif /* _ATOMIC_OP_ASM_H_ */ 136
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