minix/common/lib/libc/arch/alpha/atomic/atomic_cas.S

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/* $NetBSD: atomic_cas.S,v 1.5 2008/05/25 15:56:11 chs Exp $ */
/*-
* Copyright (c) 2007, 2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe.
*
* 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"
.text
LEAF(_atomic_cas_32, 3)
1: mov a2, t2
ldl_l v0, 0(a0)
cmpeq v0, a1, t1
beq t1, 2f
stl_c t2, 0(a0)
beq t2, 3f
2: RET
3: br 1b
END(_atomic_cas_32)
ATOMIC_OP_ALIAS(atomic_cas_32,_atomic_cas_32)
ATOMIC_OP_ALIAS(atomic_cas_uint,_atomic_cas_32)
STRONG_ALIAS(_atomic_cas_uint,_atomic_cas_32)
ATOMIC_OP_ALIAS(atomic_cas_32_ni,_atomic_cas_32)
STRONG_ALIAS(_atomic_cas_32_ni,_atomic_cas_32)
ATOMIC_OP_ALIAS(atomic_cas_uint_ni,_atomic_cas_32)
STRONG_ALIAS(_atomic_cas_uint_ni,_atomic_cas_32)
LEAF(_atomic_cas_64, 3)
1: mov a2, t2
ldq_l v0, 0(a0)
cmpeq v0, a1, t1
beq t1, 2f
stq_c t2, 0(a0)
beq t2, 3f
2: RET
3: br 1b
END(_atomic_cas_64)
ATOMIC_OP_ALIAS(atomic_cas_64,_atomic_cas_64)
ATOMIC_OP_ALIAS(atomic_cas_ulong,_atomic_cas_64)
STRONG_ALIAS(_atomic_cas_ulong,_atomic_cas_64)
ATOMIC_OP_ALIAS(atomic_cas_ptr,_atomic_cas_64)
STRONG_ALIAS(_atomic_cas_ptr,_atomic_cas_64)
ATOMIC_OP_ALIAS(atomic_cas_64_ni,_atomic_cas_64)
STRONG_ALIAS(_atomic_cas_64_ni,_atomic_cas_64)
ATOMIC_OP_ALIAS(atomic_cas_ulong_ni,_atomic_cas_64)
STRONG_ALIAS(_atomic_cas_ulong_ni,_atomic_cas_64)
ATOMIC_OP_ALIAS(atomic_cas_ptr_ni,_atomic_cas_64)
STRONG_ALIAS(_atomic_cas_ptr_ni,_atomic_cas_64)