1/* $NetBSD: atomic_cas.S,v 1.13 2015/07/10 20:16:01 mlelstv Exp $ */ 2 3/*- 4 * Copyright (c) 2007, 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe. 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#include "atomic_op_asm.h" 33 34 .text 35 36ENTRY(_atomic_cas_32) 37 movl 4(%sp), %a0 38 movl 8(%sp), %d0 39 movl 12(%sp), %d1 40 casl %d0, %d1, (%a0) 41 /* %d0 now contains the old value */ 42 movl %d0, %a0 /* pointers return also in %a0 */ 43 rts 44END(_atomic_cas_32) 45 46ATOMIC_OP_ALIAS(atomic_cas_32,_atomic_cas_32) 47ATOMIC_OP_ALIAS(atomic_cas_uint,_atomic_cas_32) 48STRONG_ALIAS(_atomic_cas_uint,_atomic_cas_32) 49ATOMIC_OP_ALIAS(atomic_cas_ulong,_atomic_cas_32) 50STRONG_ALIAS(_atomic_cas_ulong,_atomic_cas_32) 51ATOMIC_OP_ALIAS(atomic_cas_ptr,_atomic_cas_32) 52STRONG_ALIAS(_atomic_cas_ptr,_atomic_cas_32) 53CRT_ALIAS(__sync_val_compare_and_swap_4,_atomic_cas_32) 54 55ATOMIC_OP_ALIAS(atomic_cas_32_ni,_atomic_cas_32) 56STRONG_ALIAS(_atomic_cas_32_ni,_atomic_cas_32) 57ATOMIC_OP_ALIAS(atomic_cas_uint_ni,_atomic_cas_32) 58STRONG_ALIAS(_atomic_cas_uint_ni,_atomic_cas_32) 59ATOMIC_OP_ALIAS(atomic_cas_ulong_ni,_atomic_cas_32) 60STRONG_ALIAS(_atomic_cas_ulong_ni,_atomic_cas_32) 61ATOMIC_OP_ALIAS(atomic_cas_ptr_ni,_atomic_cas_32) 62STRONG_ALIAS(_atomic_cas_ptr_ni,_atomic_cas_32) 63 64ENTRY(__sync_bool_compare_and_swap_4) 65 movl 4(%sp), %a0 66 movl 8(%sp), %d0 67 movl 12(%sp), %d1 68 casl %d0, %d1, (%a0) 69 beqs 1f 70 clrl %d0 /* return false */ 71 rts 721: movql #1, %d0 /* return success */ 73 rts 74END(__sync_bool_compare_and_swap_4) 75 76ENTRY(_atomic_cas_16) 77 movl 4(%sp), %a0 78 movw 8+2(%sp), %d0 /* lower word */ 79 movw 12+2(%sp), %d1 /* lower word */ 80 casw %d0, %d1, (%a0) 81 /* %d0 now contains the old value */ 82 rts 83END(_atomic_cas_16) 84 85ATOMIC_OP_ALIAS(atomic_cas_16,_atomic_cas_16) 86CRT_ALIAS(__sync_val_compare_and_swap_2,_atomic_cas_16) 87 88ENTRY(__sync_bool_compare_and_swap_2) 89 movl 4(%sp), %a0 90 movw 8+2(%sp), %d0 /* lower word */ 91 movw 12+2(%sp), %d1 /* lower word */ 92 casw %d0, %d1, (%a0) 93 /* %d0 now contains the old value */ 94 beqs 1f 95 clrl %d0 /* return failure */ 96 rts 971: movql #1, %d0 /* return success */ 98 rts 99END(__sync_bool_compare_and_swap_2) 100 101ENTRY(_atomic_cas_8) 102 movl 4(%sp), %a0 103 movb 8+3(%sp), %d0 /* lower byte */ 104 movb 12+3(%sp), %d1 /* lower byte */ 105 casb %d0, %d1, (%a0) 106 /* %d0 now contains the old value */ 107 rts 108END(_atomic_cas_8) 109 110ATOMIC_OP_ALIAS(atomic_cas_8,_atomic_cas_8) 111CRT_ALIAS(__sync_val_compare_and_swap_1,_atomic_cas_8) 112 113 114ENTRY(__sync_bool_compare_and_swap_1) 115 movl 4(%sp), %a0 116 movb 8+3(%sp), %d0 /* lower byte */ 117 movb 12+3(%sp), %d1 /* lower byte */ 118 casb %d0, %d1, (%a0) 119 /* %d0 now contains the old value */ 120 beqs 1f 121 clrl %d0 /* return failure */ 122 rts 1231: movql #1, %d0 /* return success */ 124 rts 125END(__sync_bool_compare_and_swap_1) 126 127