1/* $NetBSD: atomic_swap.S,v 1.10 2022/04/06 22:47:56 riastradh Exp $ */ 2 3/*- 4 * Copyright (c) 2007 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_swap_32) 37 movl 4(%sp), %a0 381: movl (%a0), %d0 39 movl 8(%sp), %d1 40 casl %d0, %d1, (%a0) 41 bne 1b 42 /* %d0 now contains the old value */ 43 movl %d0, %a0 /* pointers return also in %a0 */ 44 rts 45END(_atomic_swap_32) 46ATOMIC_OP_ALIAS(atomic_swap_32,_atomic_swap_32) 47ATOMIC_OP_ALIAS(atomic_swap_uint,_atomic_swap_32) 48STRONG_ALIAS(_atomic_swap_uint,_atomic_swap_32) 49ATOMIC_OP_ALIAS(atomic_swap_ulong,_atomic_swap_32) 50STRONG_ALIAS(_atomic_swap_ulong,_atomic_swap_32) 51ATOMIC_OP_ALIAS(atomic_swap_ptr,_atomic_swap_32) 52STRONG_ALIAS(_atomic_swap_ptr,_atomic_swap_32) 53CRT_ALIAS(__sync_lock_test_and_set_4,_atomic_swap_32) 54CRT_ALIAS(__atomic_exchange_4,_atomic_swap_32) 55 56 57ENTRY(_atomic_swap_16) 58 movl 4(%sp), %a0 591: movw (%a0), %d0 60 movw 8(%sp), %d1 61 casw %d0, %d1, (%a0) 62 bne 1b 63 /* %d0 now contains the old value */ 64 rts 65END(_atomic_swap_16) 66ATOMIC_OP_ALIAS(atomic_swap_16,_atomic_swap_16) 67CRT_ALIAS(__sync_lock_test_and_set_2,_atomic_swap_16) 68CRT_ALIAS(__atomic_exchange_2,_atomic_swap_16) 69 70ENTRY(_atomic_swap_8) 71 movl 4(%sp), %a0 721: movb (%a0), %d0 73 movb 8(%sp), %d1 74 casb %d0, %d1, (%a0) 75 bne 1b 76 /* %d0 now contains the old value */ 77 rts 78END(_atomic_swap_8) 79ATOMIC_OP_ALIAS(atomic_swap_8,_atomic_swap_8) 80CRT_ALIAS(__sync_lock_test_and_set_1,_atomic_swap_8) 81CRT_ALIAS(__atomic_exchange_1,_atomic_swap_8) 82