1/*	$NetBSD: atomic_dec.S,v 1.3 2008/04/28 20:22:51 martin 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
36LEAF(_atomic_dec_32, 1)
371:	ldl_l	t1, 0(a0)
38	subl	t1, 1, t2
39	stl_c	t2, 0(a0)
40	beq	t2, 2f
41	RET
422:	br	1b
43	END(_atomic_dec_32)
44ATOMIC_OP_ALIAS(atomic_dec_32,_atomic_dec_32)
45ATOMIC_OP_ALIAS(atomic_dec_uint,_atomic_dec_32)
46STRONG_ALIAS(_atomic_dec_uint,_atomic_dec_32)
47
48LEAF(_atomic_dec_32_nv, 1)
491:	ldl_l	t1, 0(a0)
50	subl	t1, 1, t2
51	mov	t2, v0
52	stl_c	t2, 0(a0)
53	beq	t2, 2f
54	RET
552:	br	1b
56	END(_atomic_dec_32_nv)
57ATOMIC_OP_ALIAS(atomic_dec_32_nv,_atomic_dec_32_nv)
58ATOMIC_OP_ALIAS(atomic_dec_uint_nv,_atomic_dec_32_nv)
59STRONG_ALIAS(_atomic_dec_uint_nv,_atomic_dec_32_nv)
60
61LEAF(_atomic_dec_64, 1)
621:	ldq_l	t1, 0(a0)
63	subq	t1, 1, t2
64	stq_c	t2, 0(a0)
65	beq	t2, 2f
66	RET
672:	br	1b
68	END(_atomic_dec_64)
69ATOMIC_OP_ALIAS(atomic_dec_64,_atomic_dec_64)
70ATOMIC_OP_ALIAS(atomic_dec_ulong,_atomic_dec_64)
71STRONG_ALIAS(_atomic_dec_ulong,_atomic_dec_64)
72ATOMIC_OP_ALIAS(atomic_dec_ptr,_atomic_dec_64)
73STRONG_ALIAS(_atomic_dec_ptr,_atomic_dec_64)
74
75LEAF(_atomic_dec_64_nv, 1)
761:	ldq_l	t1, 0(a0)
77	subq	t1, 1, t2
78	mov	t2, v0
79	stq_c	t2, 0(a0)
80	beq	t2, 2f
81	RET
822:	br	1b
83	END(_atomic_dec_64_nv)
84ATOMIC_OP_ALIAS(atomic_dec_64_nv,_atomic_dec_64_nv)
85ATOMIC_OP_ALIAS(atomic_dec_ulong_nv,_atomic_dec_64_nv)
86STRONG_ALIAS(_atomic_dec_ulong_nv,_atomic_dec_64_nv)
87ATOMIC_OP_ALIAS(atomic_dec_ptr_nv,_atomic_dec_64_nv)
88STRONG_ALIAS(_atomic_dec_ptr_nv,_atomic_dec_64_nv)
89