1/*	$NetBSD: atomic_add_64.S,v 1.14 2021/07/28 07:32:20 skrll Exp $	*/
2/*-
3 * Copyright (c) 2012 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_add_64_nv)
36	push	{r3, r4}		/* save temporary */
37	mov	ip, r0			/* need r0 for return value */
38#ifndef __ARM_EABI__
39	mov	r3, r2
40	mov	r2, r1
41#endif
421:	ldrexd	r0, r1, [ip]		/* load old value */
43	adds	LO, LO, NLO		/* calculate new value lo */
44	adcs	HI, HI, NHI		/* calculate new value hi */
45	strexd	r4, r0, r1, [ip]	/* try to store */
46	cmp	r4, #0			/*   succeed? */
47	bne	1b			/*     no, try again? */
48	pop	{r3, r4}		/* restore temporary */
49	RET				/* return new value */
50END(_atomic_add_64_nv)
51
52STRONG_ALIAS(_atomic_add_64,_atomic_add_64_nv)
53ATOMIC_OP_ALIAS(atomic_add_64_nv,_atomic_add_64_nv)
54ATOMIC_OP_ALIAS(atomic_add_64,_atomic_add_64)
55
56ENTRY_NP(__sync_add_and_fetch_8)
57	push	{r4, lr}
58	DMB
59	bl	_atomic_add_64_nv
60	DMB
61	pop	{r4, pc}
62END(__sync_add_and_fetch_8)
63
64#endif /* _ARM_ARCH_6 */
65