1/*	$NetBSD: atomic_xor_32.S,v 1.5 2021/07/28 07:32:20 skrll 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#if defined(_ARM_ARCH_6)
34
35ENTRY_NP(_atomic_xor_32)
36	mov	ip, r0
371:	ldrex	r0, [ip]		/* load old value (to be returned) */
38	eors	r3, r0, r1		/* calculate new value */
39	strex	r2, r3, [ip]		/* try to store */
40	cmp	r2, #0			/*   succeed? */
41	bne	1b			/*     no, try again */
42	RET				/* return old value */
43END(_atomic_xor_32)
44
45ATOMIC_OP_ALIAS(atomic_xor_32,_atomic_xor_32)
46ATOMIC_OP_ALIAS(atomic_xor_uint,_atomic_xor_32)
47ATOMIC_OP_ALIAS(atomic_xor_ulong,_atomic_xor_32)
48CRT_ALIAS(__atomic_fetch_xor_4,_atomic_xor_32)
49STRONG_ALIAS(_atomic_xor_uint,_atomic_xor_32)
50STRONG_ALIAS(_atomic_xor_ulong,_atomic_xor_32)
51
52ENTRY_NP(__sync_fetch_and_xor_4)
53	push	{r4, lr}
54	DMB
55	bl	_atomic_xor_32
56	DMB
57	pop	{r4, pc}
58END(__sync_fetch_and_xor_4)
59
60ENTRY_NP(_atomic_xor_32_nv)
61	mov	ip, r0			/* need r0 for return value */
621:	ldrex	r0, [ip]		/* load old value */
63	eors	r0, r0, r1		/* calculate new value (return value) */
64	strex	r2, r0, [ip]		/* try to store */
65	cmp	r2, #0			/*   succeed? */
66	bne	1b			/*     no, try again? */
67	RET				/* return new value */
68END(_atomic_xor_32_nv)
69
70ATOMIC_OP_ALIAS(atomic_xor_32_nv,_atomic_xor_32_nv)
71ATOMIC_OP_ALIAS(atomic_xor_uint_nv,_atomic_xor_32_nv)
72ATOMIC_OP_ALIAS(atomic_xor_ulong_nv,_atomic_xor_32_nv)
73STRONG_ALIAS(_atomic_xor_uint_nv,_atomic_xor_32_nv)
74STRONG_ALIAS(_atomic_xor_ulong_nv,_atomic_xor_32_nv)
75
76ENTRY_NP(__sync_xor_and_fetch_4)
77	push	{r4, lr}
78	DMB
79	bl	_atomic_xor_32_nv
80	DMB
81	pop	{r4, pc}
82END(__sync_xor_and_fetch_4)
83
84
85#endif /* _ARM_ARCH_6 */
86