1/*	$NetBSD: sync_fetch_and_nand_8.S,v 1.2 2013/11/30 21:09:11 joerg 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#ifdef _ARM_ARCH_6
35
36ENTRY_NP(__sync_fetch_and_nand_8)
37	push	{r4-r7}
38	mov	ip, r0
39#ifndef __ARM__EABI__
40	mov	r3, r2
41	mov	r2, r1
42#endif
431:	ldrexd	r0, r1, [ip]		/* load old value */
44	mvns	r4, r0			/* complement old value */
45	mvns	r5, r0			/* complement old value */
46	ands	r4, r4, r2		/* calculate new value */
47	ands	r5, r5, r3		/* calculate new value */
48	strexd	r6, r4, r5, [ip]	/* try to store */
49	cmp	r6, #0			/*   succeed? */
50	bne	1b			/*     no, try again */
51#ifdef _ARM_ARCH_7
52	dmb
53#else
54	mcr	p15, 0, r2, c7, c10, 5	/* data memory barrier */
55#endif
56	pop	{r4-r7}
57	RET				/* return old value */
58END(__sync_fetch_and_nand_8)
59
60#endif /* _ARM_ARCH_6 */
61