1*5298fab7Sandvar/* $NetBSD: atomic_swap_64.S,v 1.15 2021/08/01 21:58:56 andvar Exp $ */ 2b9b9bd89Smatt/*- 36e8da97cSmatt * Copyright (c) 2012 The NetBSD Foundation, Inc. 4b9b9bd89Smatt * All rights reserved. 5b9b9bd89Smatt * 6b9b9bd89Smatt * This code is derived from software contributed to The NetBSD Foundation 76e8da97cSmatt * by Matt Thomas. 8b9b9bd89Smatt * 9b9b9bd89Smatt * Redistribution and use in source and binary forms, with or without 10b9b9bd89Smatt * modification, are permitted provided that the following conditions 11b9b9bd89Smatt * are met: 12b9b9bd89Smatt * 1. Redistributions of source code must retain the above copyright 13b9b9bd89Smatt * notice, this list of conditions and the following disclaimer. 14b9b9bd89Smatt * 2. Redistributions in binary form must reproduce the above copyright 15b9b9bd89Smatt * notice, this list of conditions and the following disclaimer in the 16b9b9bd89Smatt * documentation and/or other materials provided with the distribution. 17b9b9bd89Smatt * 18b9b9bd89Smatt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 19b9b9bd89Smatt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20b9b9bd89Smatt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21b9b9bd89Smatt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 22b9b9bd89Smatt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23b9b9bd89Smatt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24b9b9bd89Smatt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25b9b9bd89Smatt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26b9b9bd89Smatt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27b9b9bd89Smatt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28b9b9bd89Smatt * POSSIBILITY OF SUCH DAMAGE. 29b9b9bd89Smatt */ 30b9b9bd89Smatt 31b9b9bd89Smatt#include "atomic_op_asm.h" 32b9b9bd89Smatt 338e8c0784SskrllENTRY_NP(__sync_lock_test_and_set_8) 348e8c0784Sskrll DMB 358e8c0784Sskrll /* FALLTHROUGH */ 368e8c0784Sskrll 37b9b9bd89SmattENTRY_NP(_atomic_swap_64) 387eb7e9aaSmatt push {r3, r4} /* save temporary */ 39d6502094Smatt mov ip, r0 /* return value will be in r0 */ 40b9b9bd89Smatt#ifndef __ARM_EABI__ 41*5298fab7Sandvar mov r3, r2 /* r2 will be overwritten by r1 */ 42b9b9bd89Smatt mov r2, r1 /* and r1 will be overwritten by ldrexd */ 43b9b9bd89Smatt#endif 445ce8d6dfSjoerg1: ldrexd r0, r1, [ip] /* load old value */ 455ce8d6dfSjoerg strexd r4, r2, r3, [ip] /* store new value */ 46d6502094Smatt cmp r4, #0 /* succeed? */ 47b9b9bd89Smatt bne 1b /* no, try again */ 487eb7e9aaSmatt pop {r3, r4} /* restore temporary */ 49b9b9bd89Smatt RET 50b9b9bd89SmattEND(_atomic_swap_64) 518e8c0784SskrllEND(__sync_lock_test_and_set_8) 528e8c0784Sskrll 538e8c0784Sskrll 54b9b9bd89SmattATOMIC_OP_ALIAS(atomic_swap_64,_atomic_swap_64) 55bd7dee05SjoergCRT_ALIAS(__atomic_exchange_8,_atomic_swap_64) 56918e319dSmatt 57b4bb7421Sjustin#if (!defined(_KERNEL) || !defined(_RUMPKERNEL)) && !defined(_STANDALONE) 58918e319dSmattENTRY_NP(__sync_lock_release_8) 59918e319dSmatt mov r2, #0 60918e319dSmatt mov r3, #0 618e8c0784Sskrll 628e8c0784Sskrll DMB 635ce8d6dfSjoerg strd r2, r3, [r0] 64918e319dSmatt RET 65918e319dSmattEND(__sync_lock_release_8) 66ab7ecd2cSmatt#endif 67