/* $NetBSD: sync_fetch_and_and_8.S,v 1.5.18.1 2021/08/11 17:05:42 martin Exp $ */ /*- * Copyright (c) 2013 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Matt Thomas <matt@3am-software.com> * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include "atomic_op_asm.h" #if defined(_ARM_ARCH_6) ENTRY_NP(__sync_fetch_and_and_8) push {r4-r7} mov ip, r0 #ifndef __ARM__EABI__ mov r3, r2 mov r2, r1 #endif DMB 1: ldrexd r0, r1, [ip] /* load old value */ ands r4, r0, r2 /* calculate new value */ ands r5, r1, r3 /* calculate new value */ strexd r6, r4, r5, [ip] /* try to store */ cmp r6, #0 /* succeed? */ bne 1b /* no, try again */ DMB pop {r4-r7} RET /* return old value */ END(__sync_fetch_and_and_8) CRT_ALIAS(atomic_fetch_and_8,____sync_fetch_and_and_8) #endif /* _ARM_ARCH_6 */ |