1/*	$NetBSD: atomic_swap.S,v 1.6 2008/05/25 15:56:12 chs Exp $	*/
2
3/*-
4 * Copyright (c) 2007 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jason R. Thorpe.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include "atomic_op_asm.h"
33
34	.text
35
36ENTRY(_atomic_swap_32)
37	ld	[%o0], %o2
381:	mov	%o1, %o3
39	cas	[%o0], %o2, %o3
40	cmp	%o2, %o3
41	bne,a,pn %icc, 1b
42	 mov	%o3, %o2
43	retl
44	 mov	%o3, %o0
45ATOMIC_OP_ALIAS(atomic_swap_32,_atomic_swap_32)
46ATOMIC_OP_ALIAS(atomic_swap_uint,_atomic_swap_32)
47STRONG_ALIAS(_atomic_swap_uint,_atomic_swap_32)
48
49ENTRY(_atomic_swap_64)
50	ldx	[%o0], %o2
511:	mov	%o1, %o3
52	casx	[%o0], %o2, %o3
53	cmp	%o2, %o3
54	bne,a,pn %xcc, 1b
55	 mov	%o3, %o2
56	retl
57	 mov	%o3, %o0
58ATOMIC_OP_ALIAS(atomic_swap_64,_atomic_swap_64)
59
60ATOMIC_OP_ALIAS_SIZE(atomic_swap_ulong,_atomic_swap)
61STRONG_ALIAS_SIZE(_atomic_swap_ulong,_atomic_swap)
62ATOMIC_OP_ALIAS_SIZE(atomic_swap_ptr,_atomic_swap)
63STRONG_ALIAS_SIZE(_atomic_swap_ptr,_atomic_swap)
64