1/* $NetBSD: atomic_cas.S,v 1.10 2014/02/22 17:08:30 martin 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), %d3 67 movl %d3, %d2 68 movl 12(%sp), %d1 69 casl %d3, %d1, (%a0) 70 /* %d3 now contains the old value */ 71 beq 1f 72 clrl %d0 /* return false */ 73 rts 741: movl #1, %d0 /* return success */ 75 rts 76END(__sync_bool_compare_and_swap_4) 77 78ENTRY(_atomic_cas_16) 79 movl 4(%sp), %a0 80 movw 8(%sp), %d0 81 movw 10(%sp), %d1 82 casw %d0, %d1, (%a0) 83 /* %d0 now contains the old value */ 84 rts 85END(_atomic_cas_16) 86 87ATOMIC_OP_ALIAS(atomic_cas_16,_atomic_cas_16) 88CRT_ALIAS(__sync_val_compare_and_swap_2,_atomic_cas_16) 89 90ENTRY(__sync_bool_compare_and_swap_2) 91 movl 4(%sp), %a0 92 movw 8(%sp), %d3 93 movw %d3, %d2 94 movw 10(%sp), %d1 95 casw %d3, %d1, (%a0) 96 /* %d3 now contains the old value */ 97 beq 1f 98 clrl %d0 /* return failure */ 99 rts 1001: movl #1, %d0 /* return success */ 101 rts 102END(__sync_bool_compare_and_swap_2) 103 104ENTRY(_atomic_cas_8) 105 movl 4(%sp), %a0 106 movb 8(%sp), %d0 107 movb 9(%sp), %d1 108 casb %d0, %d1, (%a0) 109 /* %d0 now contains the old value */ 110 rts 111END(_atomic_cas_8) 112 113ATOMIC_OP_ALIAS(atomic_cas_8,_atomic_cas_8) 114CRT_ALIAS(__sync_val_compare_and_swap_1,_atomic_cas_8) 115 116 117ENTRY(__sync_bool_compare_and_swap_1) 118 movl 4(%sp), %a0 119 movb 8(%sp), %d3 120 movb %d3, %d2 121 movb 9(%sp), %d1 122 casb %d3, %d1, (%a0) 123 /* %d3 now contains the old value */ 124 beq 1f 125 clrl %d0 /* return failure */ 126 rts 1271: movl #1, %d0 /* return success */ 128 rts 129END(__sync_bool_compare_and_swap_1) 130 131