11.5Sskrll/* $NetBSD: atomic_sub_64.S,v 1.5 2021/07/28 07:32:20 skrll Exp $ */ 21.1Smatt 31.1Smatt/*- 41.1Smatt * Copyright (c) 2013 The NetBSD Foundation, Inc. 51.1Smatt * All rights reserved. 61.1Smatt * 71.1Smatt * This code is derived from software contributed to The NetBSD Foundation 81.1Smatt * by Matt Thomas <matt@3am-software.com> 91.1Smatt * 101.1Smatt * Redistribution and use in source and binary forms, with or without 111.1Smatt * modification, are permitted provided that the following conditions 121.1Smatt * are met: 131.1Smatt * 1. Redistributions of source code must retain the above copyright 141.1Smatt * notice, this list of conditions and the following disclaimer. 151.1Smatt * 2. Redistributions in binary form must reproduce the above copyright 161.1Smatt * notice, this list of conditions and the following disclaimer in the 171.1Smatt * documentation and/or other materials provided with the distribution. 181.1Smatt * 191.1Smatt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 201.1Smatt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 211.1Smatt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 221.1Smatt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 231.1Smatt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 241.1Smatt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 251.1Smatt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 261.1Smatt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 271.1Smatt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 281.1Smatt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 291.1Smatt * POSSIBILITY OF SUCH DAMAGE. 301.1Smatt */ 311.1Smatt 321.1Smatt#include "atomic_op_asm.h" 331.1Smatt 341.4Sskrll#if defined(_ARM_ARCH_6) 351.1Smatt 361.1SmattENTRY_NP(_atomic_sub_64_nv) 371.3Sskrll push {r3, r4} /* save temporary */ 381.1Smatt mov ip, r0 /* need r0 for return value */ 391.1Smatt#ifndef __ARM_EABI__ 401.1Smatt mov r3, r2 411.1Smatt mov r2, r1 421.1Smatt#endif 431.1Smatt1: ldrexd r0, [ip] /* load old value */ 441.1Smatt subs LO, LO, NLO /* calculate new value lo */ 451.1Smatt sbcs HI, HI, NHI /* calculate new value hi */ 461.1Smatt strexd r4, r0, [ip] /* try to store */ 471.1Smatt cmp r4, #0 /* succeed? */ 481.1Smatt bne 1b /* no, try again? */ 491.3Sskrll pop {r3, r4} /* restore temporary */ 501.1Smatt RET /* return new value */ 511.1SmattEND(_atomic_sub_64_nv) 521.1Smatt 531.1SmattSTRONG_ALIAS(_atomic_sub_64,_atomic_sub_64_nv) 541.1SmattATOMIC_OP_ALIAS(atomic_sub_64_nv,_atomic_sub_64_nv) 551.1SmattATOMIC_OP_ALIAS(atomic_sub_64,_atomic_sub_64) 561.5Sskrll 571.5SskrllENTRY_NP(__sync_sub_and_fetch_8) 581.5Sskrll push {r4, lr} 591.5Sskrll DMB 601.5Sskrll bl _atomic_sub_64_nv 611.5Sskrll DMB 621.5Sskrll pop {r4, pc} 631.5SskrllEND(__sync_sub_and_fetch_8) 641.5Sskrll 651.1Smatt 661.1Smatt#endif /* _ARM_ARCH_6 */ 67