1/*	$NetBSD: atomic_swap.S,v 1.2 2009/12/14 00:39:00 matt Exp $	*/
2
3/*-
4 * Copyright (c) 2008 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30#include <machine/asm.h>
31#include "atomic_op_asm.h"
32
33RCSID("$NetBSD: atomic_swap.S,v 1.2 2009/12/14 00:39:00 matt Exp $")
34
35	.text
36	.set	noat
37	.set	noreorder
38	.set	nomacro
39
40LEAF(_atomic_swap_32)
411:	INT_LL		v0, 0(a0)
42	 nop
43	move		t0, a1
44	INT_SC		t0, 0(a0)
45	beq		t0, zero, 1b
46 	 nop
472:
48	j		ra
49	 nop
50END(_atomic_swap_32)
51ATOMIC_OP_ALIAS(atomic_swap_32, _atomic_swap_32)
52
53#if !defined(__mips_o32)
54LEAF(_atomic_swap_64)
551:	REG_LL		v0, 0(a0)
56	 nop
57	move		t0, a1
58	REG_SC		t0, 0(a0)
59	beq		t0, zero, 1b
60 	 nop
612:
62	j		ra
63	 nop
64END(_atomic_swap_64)
65ATOMIC_OP_ALIAS(atomic_swap_64, _atomic_swap_64)
66#endif
67
68#ifdef _LP64
69STRONG_ALIAS(_atomic_swap_ptr,		_atomic_swap_64)
70STRONG_ALIAS(_atomic_swap_ulong,	_atomic_swap_64)
71#else
72STRONG_ALIAS(_atomic_swap_ptr,		_atomic_swap_32)
73STRONG_ALIAS(_atomic_swap_ulong,	_atomic_swap_32)
74#endif
75STRONG_ALIAS(_atomic_swap_uint,		_atomic_swap_32)
76
77ATOMIC_OP_ALIAS(atomic_swap_ptr,	_atomic_swap_ptr)
78ATOMIC_OP_ALIAS(atomic_swap_uint,	_atomic_swap_uint)
79ATOMIC_OP_ALIAS(atomic_swap_ulong,	_atomic_swap_ulong)
80