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/* $NetBSD: atomic_add_64.S,v 1.11 2014/03/04 16:15:28 matt Exp $ */
/*-
* Copyright (c) 2012 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"
#ifdef _ARM_ARCH_6
ENTRY_NP(_atomic_add_64_nv)
push {r3,r4} /* save temporary */
mov ip, r0 /* need r0 for return value */
#ifndef __ARM_EABI__
mov r3, r2
mov r2, r1
#endif
1: ldrexd r0, r1, [ip] /* load old value */
adds LO, LO, NLO /* calculate new value lo */
adcs HI, HI, NHI /* calculate new value hi */
strexd r4, r0, r1, [ip] /* try to store */
cmp r4, #0 /* succeed? */
bne 1b /* no, try again? */
#ifdef _ARM_ARCH_7
dmb
#else
mcr p15, 0, r4, c7, c10, 5 /* data memory barrier */
#endif
pop {r3,r4} /* restore temporary */
RET /* return new value */
END(_atomic_add_64_nv)
STRONG_ALIAS(_atomic_add_64,_atomic_add_64_nv)
ATOMIC_OP_ALIAS(atomic_add_64_nv,_atomic_add_64_nv)
ATOMIC_OP_ALIAS(atomic_add_64,_atomic_add_64)
CRT_ALIAS(__sync_add_and_fetch_8,_atomic_add_64_nv)
#endif /* _ARM_ARCH_6 */
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