1/* $NetBSD: atomic_swap_16.S,v 1.7 2021/07/28 07:32:20 skrll Exp $ */ 2 3/*- 4 * Copyright (c) 2013 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#include "atomic_op_asm.h" 33 34#if defined(_ARM_ARCH_6) 35 36ENTRY_NP(__sync_lock_test_and_set_2) 37 DMB 38 /* FALLTHROUGH */ 39 40ENTRY_NP(_atomic_swap_16) 41 mov ip, r0 421: 43 ldrexh r0, [ip] 44 strexh r3, r1, [ip] 45 cmp r3, #0 46 bne 1b 47 RET 48END(_atomic_swap_16) 49END(__sync_lock_test_and_set_2) 50 51ATOMIC_OP_ALIAS(atomic_swap_16,_atomic_swap_16) 52ATOMIC_OP_ALIAS(atomic_swap_short,_atomic_swap_16) 53ATOMIC_OP_ALIAS(atomic_swap_ushort,_atomic_swap_16) 54CRT_ALIAS(__atomic_exchange_2,_atomic_swap_16) 55STRONG_ALIAS(_atomic_swap_short,_atomic_swap_16) 56STRONG_ALIAS(_atomic_swap_ushort,_atomic_swap_16) 57 58 59#if (!defined(_KERNEL) || !defined(_RUMPKERNEL)) && !defined(_STANDALONE) 60ENTRY_NP(__sync_lock_release_2) 61 mov r1, #0 62 DMB 63 strh r1, [r0] 64 RET 65END(__sync_lock_release_2) 66#endif 67#endif /* _ARM_ARCH_6 */ 68