61 lines
2.3 KiB
ArmAsm
61 lines
2.3 KiB
ArmAsm
/* $NetBSD: atomic_swap_64.S,v 1.7 2013/11/30 21:09:11 joerg Exp $ */
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/*-
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* Copyright (c) 2012 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Matt Thomas.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "atomic_op_asm.h"
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ENTRY_NP(_atomic_swap_64)
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push {r3,r4} /* save temporary */
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mov ip, r0 /* return value will be in r0 */
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#ifndef __ARM_EABI__
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mov r3, r2 /* r2 will be overwriten by r1 */
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mov r2, r1 /* and r1 will be overwritten by ldrexd */
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#endif
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1: ldrexd r0, r1, [ip] /* load old value */
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strexd r4, r2, r3, [ip] /* store new value */
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cmp r4, #0 /* succeed? */
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bne 1b /* no, try again */
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#ifdef _ARM_ARCH_7
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dmb
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#else
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mcr p15, 0, r4, c7, c10, 5 /* data memory barrier */
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#endif
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pop {r3,r4} /* restore temporary */
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RET
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END(_atomic_swap_64)
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ATOMIC_OP_ALIAS(atomic_swap_64,_atomic_swap_64)
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STRONG_ALIAS(__sync_lock_test_and_set_8,_atomic_swap_64)
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ENTRY_NP(__sync_lock_release_8)
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mov r2, #0
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mov r3, #0
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strd r2, r3, [r0]
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RET
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END(__sync_lock_release_8)
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