1/*	$NetBSD: atomic_dec_32.S,v 1.1 2014/09/03 19:34:25 matt Exp $	*/
2
3/*-
4 * Copyright (c) 2014 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Matt Thomas of 3am Software Foundry.
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
34ENTRY_NP(_atomic_dec_32)
351:	l.lwa	r11, 0(r3)		/* load old value */
36	l.addi	r5, r11, -1		/* calculate new value */
37	l.swa	0(r3), r5		/* try to store */
38	l.bnf	1b			/*   succeed? no, try again */
39	l.nop				/* -- delay slot -- */
40	l.jr	lr			/* return old value */
41	l.nop
42END(_atomic_dec_32)
43
44ATOMIC_OP_ALIAS(atomic_dec_32,_atomic_dec_32)
45ATOMIC_OP_ALIAS(atomic_dec_uint,_atomic_dec_32)
46ATOMIC_OP_ALIAS(atomic_dec_ulong,_atomic_dec_32)
47ATOMIC_OP_ALIAS(atomic_dec_ptr,_atomic_dec_32)
48STRONG_ALIAS(_atomic_dec_uint,_atomic_dec_32)
49STRONG_ALIAS(_atomic_dec_ulong,_atomic_dec_32)
50STRONG_ALIAS(_atomic_dec_ptr,_atomic_dec_32)
51
52ENTRY_NP(_atomic_dec_32_nv)
531:	l.lwa	r5, 0(r3)		/* load old value */
54	l.addi	r11, r5, -1		/* calculate new value */
55	l.swa	0(r3), r11		/* try to store */
56	l.bnf	1b			/*   succeed? no, try again */
57	l.nop				/* -- delay slot -- */
58	l.jr	lr			/* return old value */
59	l.nop
60END(_atomic_dec_32_nv)
61
62ATOMIC_OP_ALIAS(atomic_dec_32_nv,_atomic_dec_32_nv)
63ATOMIC_OP_ALIAS(atomic_dec_uint_nv,_atomic_dec_32_nv)
64ATOMIC_OP_ALIAS(atomic_dec_ulong_nv,_atomic_dec_32_nv)
65ATOMIC_OP_ALIAS(atomic_dec_ptr_nv,_atomic_dec_32_nv)
66STRONG_ALIAS(_atomic_dec_uint_nv,_atomic_dec_32_nv)
67STRONG_ALIAS(_atomic_dec_ulong_nv,_atomic_dec_32_nv)
68STRONG_ALIAS(_atomic_dec_ptr_nv,_atomic_dec_32_nv)
69