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/* $NetBSD: atomic_swap.S,v 1.9 2014/06/28 20:18:55 joerg Exp $ */
/*-
* Copyright (c) 2007 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
ENTRY(_atomic_swap_32)
movl 4(%sp), %a0
1: movl (%a0), %d0
movl 8(%sp), %d1
casl %d0, %d1, (%a0)
bne 1b
/* %d0 now contains the old value */
movl %d0, %a0 /* pointers return also in %a0 */
rts
END(_atomic_swap_32)
ATOMIC_OP_ALIAS(atomic_swap_32,_atomic_swap_32)
ATOMIC_OP_ALIAS(atomic_swap_uint,_atomic_swap_32)
STRONG_ALIAS(_atomic_swap_uint,_atomic_swap_32)
ATOMIC_OP_ALIAS(atomic_swap_ulong,_atomic_swap_32)
STRONG_ALIAS(_atomic_swap_ulong,_atomic_swap_32)
ATOMIC_OP_ALIAS(atomic_swap_ptr,_atomic_swap_32)
STRONG_ALIAS(_atomic_swap_ptr,_atomic_swap_32)
CRT_ALIAS(__sync_lock_test_and_set_4,_atomic_swap_32)
CRT_ALIAS(__atomic_exchange_4,_atomic_swap_32)
ENTRY(_atomic_swap_16)
movl 4(%sp), %a0
1: movw (%a0), %d0
movw 8(%sp), %d1
casw %d0, %d1, (%a0)
bne 1b
/* %d0 now contains the old value */
rts
END(_atomic_swap_16)
ATOMIC_OP_ALIAS(atomic_swap_16,_atomic_swap_16)
CRT_ALIAS(__sync_lock_test_and_set_2,_atomic_swap_16)
CRT_ALIAS(__atomic_exchange_2,_atomic_swap_16)
ENTRY(_atomic_swap_8)
movl 4(%sp), %a0
1: movb (%a0), %d0
movb 8(%sp), %d1
casb %d0, %d1, (%a0)
bne 1b
/* %d0 now contains the old value */
rts
END(_atomic_swap_8)
ATOMIC_OP_ALIAS(atomic_swap_8,_atomic_swap_8)
CRT_ALIAS(__sync_lock_test_and_set_1,_atomic_swap_8)
CRT_ALIAS(__atomic_exchange_1,_atomic_swap_8)
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