1/* $NetBSD: atomic_or_64.S,v 1.2 2012/09/13 00:36:12 matt 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#ifdef _ARM_ARCH_6 34 35ENTRY_NP(_atomic_or_64) 36 str r4, [sp, #-4]! /* save temporary */ 37#ifndef __ARM_EABI__ 38 mov r3, r2 39 mov r2, r1 40#endif 41 mov r4, r0 /* need r0 for return value */ 421: ldrexd r0, [r4] /* load old value (to be returned) */ 43 orr r2, r0, r2 /* calculate new value */ 44 orr r3, r1, r3 /* calculate new value */ 45 strexd ip, r2, [r4] /* try to store */ 46 cmp ip, #0 /* succeed? */ 47 bne 1b /* no, try again */ 48#ifdef _ARM_ARCH_7 49 dmb 50#else 51 mcr p15, 0, ip, c7, c10, 5 /* data memory barrier */ 52#endif 53 ldr r4, [sp], #4 /* restore temporary */ 54 RET /* return old value */ 55 END(_atomic_or_64) 56ATOMIC_OP_ALIAS(atomic_or_64,_atomic_or_64) 57 58ENTRY_NP(_atomic_or_64_nv) 59 str r4, [sp, #-4]! /* save temporary */ 60#ifndef __ARM_EABI__ 61 mov r3, r2 62 mov r2, r1 63#endif 64 mov r4, r0 /* need r0 for return value */ 651: ldrexd r0, [r4] /* load old value */ 66 orr r0, r0, r2 /* calculate new value (return value) */ 67 orr r1, r1, r3 /* calculate new value (return value) */ 68 strexd ip, r0, [r4] /* try to store */ 69 cmp ip, #0 /* succeed? */ 70 bne 1b /* no, try again? */ 71#ifdef _ARM_ARCH_7 72 dmb 73#else 74 mcr p15, 0, ip, c7, c10, 5 /* data memory barrier */ 75#endif 76 ldr r4, [sp], #4 /* restore temporary */ 77 RET /* return new value */ 78 END(_atomic_or_64_nv) 79ATOMIC_OP_ALIAS(atomic_or_64_nv,_atomic_or_64_nv) 80 81#endif /* _ARM_ARCH_6 */ 82