1/* $NetBSD: atomic_nand_64.S,v 1.3 2014/03/04 16:15:28 matt Exp $ */ 2/*- 3 * Copyright (c) 2013 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_nand_64_nv) 36 push {r3,r4} /* save temporary */ 37#ifndef __ARM_EABI__ 38 mov r3, r2 39 mov r2, r1 40#endif 41 mov ip, r0 /* need r0 for return value */ 421: ldrexd r0, r1, [ip] /* load old value */ 43 mvns r0, r0 /* complement old value */ 44 mvns r1, r1 /* complement old value */ 45 ands r0, r0, r2 /* calculate new value */ 46 ands r1, r1, r3 /* calculate new value */ 47 strexd r4, r0, r1, [ip] /* try to store */ 48 cmp r4, #0 /* succeed? */ 49 bne 1b /* no, try again? */ 50#ifdef _ARM_ARCH_7 51 dmb 52#else 53 mcr p15, 0, r4, c7, c10, 5 /* data memory barrier */ 54#endif 55 pop {r3,r4} /* restore temporary */ 56 RET /* return new value */ 57END(_atomic_nand_64_nv) 58 59STRONG_ALIAS(_atomic_nand_64,_atomic_nand_64_nv) 60ATOMIC_OP_ALIAS(atomic_nand_64_nv,_atomic_nand_64_nv) 61ATOMIC_OP_ALIAS(atomic_nand_64,_atomic_nand_64_nv) 62CRT_ALIAS(__sync_nand_and_fetch_8,_atomic_nand_64_nv) 63 64#endif /* _ARM_ARCH_6 */ 65