1*8e8c0784Sskrll/* $NetBSD: atomic_swap_16.S,v 1.7 2021/07/28 07:32:20 skrll Exp $ */ 2918e319dSmatt 3918e319dSmatt/*- 4918e319dSmatt * Copyright (c) 2013 The NetBSD Foundation, Inc. 5918e319dSmatt * All rights reserved. 6918e319dSmatt * 7918e319dSmatt * This code is derived from software contributed to The NetBSD Foundation 8918e319dSmatt * by Matt Thomas of 3am Software Foundry. 9918e319dSmatt * 10918e319dSmatt * Redistribution and use in source and binary forms, with or without 11918e319dSmatt * modification, are permitted provided that the following conditions 12918e319dSmatt * are met: 13918e319dSmatt * 1. Redistributions of source code must retain the above copyright 14918e319dSmatt * notice, this list of conditions and the following disclaimer. 15918e319dSmatt * 2. Redistributions in binary form must reproduce the above copyright 16918e319dSmatt * notice, this list of conditions and the following disclaimer in the 17918e319dSmatt * documentation and/or other materials provided with the distribution. 18918e319dSmatt * 19918e319dSmatt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20918e319dSmatt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21918e319dSmatt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22918e319dSmatt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23918e319dSmatt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24918e319dSmatt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25918e319dSmatt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26918e319dSmatt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27918e319dSmatt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28918e319dSmatt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29918e319dSmatt * POSSIBILITY OF SUCH DAMAGE. 30918e319dSmatt */ 31918e319dSmatt 32918e319dSmatt#include "atomic_op_asm.h" 33918e319dSmatt 345e911a38Sskrll#if defined(_ARM_ARCH_6) 355e911a38Sskrll 36*8e8c0784SskrllENTRY_NP(__sync_lock_test_and_set_2) 37*8e8c0784Sskrll DMB 38*8e8c0784Sskrll /* FALLTHROUGH */ 39*8e8c0784Sskrll 40918e319dSmattENTRY_NP(_atomic_swap_16) 41918e319dSmatt mov ip, r0 42918e319dSmatt1: 43918e319dSmatt ldrexh r0, [ip] 44918e319dSmatt strexh r3, r1, [ip] 45918e319dSmatt cmp r3, #0 46918e319dSmatt bne 1b 47918e319dSmatt RET 48918e319dSmattEND(_atomic_swap_16) 49*8e8c0784SskrllEND(__sync_lock_test_and_set_2) 50918e319dSmatt 51918e319dSmattATOMIC_OP_ALIAS(atomic_swap_16,_atomic_swap_16) 52918e319dSmattATOMIC_OP_ALIAS(atomic_swap_short,_atomic_swap_16) 53918e319dSmattATOMIC_OP_ALIAS(atomic_swap_ushort,_atomic_swap_16) 54bd7dee05SjoergCRT_ALIAS(__atomic_exchange_2,_atomic_swap_16) 55918e319dSmattSTRONG_ALIAS(_atomic_swap_short,_atomic_swap_16) 56918e319dSmattSTRONG_ALIAS(_atomic_swap_ushort,_atomic_swap_16) 57918e319dSmatt 58*8e8c0784Sskrll 59b4bb7421Sjustin#if (!defined(_KERNEL) || !defined(_RUMPKERNEL)) && !defined(_STANDALONE) 60918e319dSmattENTRY_NP(__sync_lock_release_2) 61918e319dSmatt mov r1, #0 62*8e8c0784Sskrll DMB 63918e319dSmatt strh r1, [r0] 64918e319dSmatt RET 65918e319dSmattEND(__sync_lock_release_2) 66ab7ecd2cSmatt#endif 67918e319dSmatt#endif /* _ARM_ARCH_6 */ 68