1/*	$NetBSD: atomic_inc_32.S,v 1.2 2008/08/16 07:12:39 matt Exp $	*/
2/*-
3 * Copyright (c) 2008 The NetBSD Foundation, Inc.
4 * All rights reserved.
5 *
6 * This code is derived from software contributed to The NetBSD Foundation
7 * by Matt Thomas <matt@3am-software.com>
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
20 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
21 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include "atomic_op_asm.h"
32
33#ifdef _ARM_ARCH_6
34
35ENTRY_NP(_atomic_inc_32)
36	mov	r2, r0			/* need r0 for return value */
371:	ldrex	r0, [r2]		/* load old value (return value) */
38	add	r1, r0, #1		/* calculate new value */
39	strex	r3, r1, [r2]		/* try to store */
40	cmp	r3, #0			/*   succeed? */
41	bne	1b			/*     no, try again? */
42	RET				/* return new value */
43	END(_atomic_inc_32)
44ATOMIC_OP_ALIAS(atomic_inc_32,_atomic_inc_32)
45ATOMIC_OP_ALIAS(atomic_inc_uint,_atomic_inc_32)
46ATOMIC_OP_ALIAS(atomic_inc_ulong,_atomic_inc_32)
47ATOMIC_OP_ALIAS(atomic_inc_ptr,_atomic_inc_32)
48STRONG_ALIAS(_atomic_inc_uint,_atomic_inc_32)
49STRONG_ALIAS(_atomic_inc_ulong,_atomic_inc_32)
50STRONG_ALIAS(_atomic_inc_ptr,_atomic_inc_32)
51
52ENTRY_NP(_atomic_inc_32_nv)
53	mov	r2, r0			/* need r0 for return value */
541:	ldrex	r0, [r2]		/* load old value */
55	add	r0, r0, #1		/* calculate new value (return value) */
56	strex	r1, r0, [r2]		/* try to store */
57	cmp	r1, #0			/*   succeed? */
58	bne	1b			/*     no, try again? */
59	RET				/* return new value */
60	END(_atomic_inc_32_nv)
61ATOMIC_OP_ALIAS(atomic_inc_32_nv,_atomic_inc_32_nv)
62ATOMIC_OP_ALIAS(atomic_inc_uint_nv,_atomic_inc_32_nv)
63ATOMIC_OP_ALIAS(atomic_inc_ulong_nv,_atomic_inc_32_nv)
64ATOMIC_OP_ALIAS(atomic_inc_ptr_nv,_atomic_inc_32_nv)
65STRONG_ALIAS(_atomic_inc_uint_nv,_atomic_inc_32_nv)
66STRONG_ALIAS(_atomic_inc_ulong_nv,_atomic_inc_32_nv)
67STRONG_ALIAS(_atomic_inc_ptr_nv,_atomic_inc_32_nv)
68
69#endif /* _ARCH_ARM_6 */
70