1/* $NetBSD: atomic_add_64.S,v 1.14 2021/07/28 07:32:20 skrll Exp $ */ 2/*- 3 * Copyright (c) 2012 The NetBSD Foundation, Inc. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to The NetBSD Foundation 7 * by Matt Thomas <matt@3am-software.com> 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31#include "atomic_op_asm.h" 32 33#if defined(_ARM_ARCH_6) 34 35ENTRY_NP(_atomic_add_64_nv) 36 push {r3, r4} /* save temporary */ 37 mov ip, r0 /* need r0 for return value */ 38#ifndef __ARM_EABI__ 39 mov r3, r2 40 mov r2, r1 41#endif 421: ldrexd r0, r1, [ip] /* load old value */ 43 adds LO, LO, NLO /* calculate new value lo */ 44 adcs HI, HI, NHI /* calculate new value hi */ 45 strexd r4, r0, r1, [ip] /* try to store */ 46 cmp r4, #0 /* succeed? */ 47 bne 1b /* no, try again? */ 48 pop {r3, r4} /* restore temporary */ 49 RET /* return new value */ 50END(_atomic_add_64_nv) 51 52STRONG_ALIAS(_atomic_add_64,_atomic_add_64_nv) 53ATOMIC_OP_ALIAS(atomic_add_64_nv,_atomic_add_64_nv) 54ATOMIC_OP_ALIAS(atomic_add_64,_atomic_add_64) 55 56ENTRY_NP(__sync_add_and_fetch_8) 57 push {r4, lr} 58 DMB 59 bl _atomic_add_64_nv 60 DMB 61 pop {r4, pc} 62END(__sync_add_and_fetch_8) 63 64#endif /* _ARM_ARCH_6 */ 65