1/*	$NetBSD: atomic_nand_8.S,v 1.5 2021/07/28 07:32:20 skrll Exp $	*/
2
3/*-
4 * Copyright (c) 2013 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 <matt@3am-software.com>
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#if defined(_ARM_ARCH_6)
35
36ENTRY_NP(_atomic_nand_8)
37	mov	ip, r0
381:	ldrexb	r0, [ip]		/* load old value (to be returned) */
39	ands	r3, r0, r1		/* calculate new value step 1 */
40	mvns	r3, r3			/* ... complement for new value */
41	strexb	r2, r3, [ip]		/* try to store */
42	cmp	r2, #0			/*   succeed? */
43	bne	1b			/*     no, try again */
44	RET				/* return old value */
45END(_atomic_nand_8)
46
47ATOMIC_OP_ALIAS(atomic_nand_8,_atomic_nand_8)
48ATOMIC_OP_ALIAS(atomic_nand_uchar,_atomic_nand_8)
49STRONG_ALIAS(_atomic_nand_uchar,_atomic_nand_8)
50
51ENTRY_NP(__sync_fetch_and_nand_1)
52	push	{r4, lr}
53	DMB
54	bl	_atomic_nand_8
55	DMB
56	pop	{r4, pc}
57END(__sync_fetch_and_nand_1)
58
59
60ENTRY_NP(_atomic_nand_8_nv)
61	mov	ip, r0			/* need r0 for return value */
621:	ldrexb	r0, [ip]		/* load old value */
63	ands	r0, r0, r1		/* calculate new value step 1*/
64	mvns	r0, r0			/* ... complement for new value */
65	strexb	r2, r0, [ip]		/* try to store */
66	cmp	r2, #0			/*   succeed? */
67	bne	1b			/*     no, try again? */
68	RET				/* return new value */
69END(_atomic_nand_8_nv)
70
71ATOMIC_OP_ALIAS(atomic_nand_8_nv,_atomic_nand_8_nv)
72ATOMIC_OP_ALIAS(atomic_nand_uchar_nv,_atomic_nand_8_nv)
73STRONG_ALIAS(_atomic_nand_uchar_nv,_atomic_nand_8_nv)
74
75ENTRY_NP(__sync_nand_and_fetch_1)
76	push	{r4, lr}
77	DMB
78	bl	_atomic_nand_8_nv
79	DMB
80	pop	{r4, pc}
81END(__sync_nand_and_fetch_1)
82
83
84#endif /* _ARM_ARCH_6 */
85