1/*
2 * Copyright (c) 2015 ARM Ltd
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. The name of the company may not be used to endorse or promote
14 *    products derived from this software without specific prior written
15 *    permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
22 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
23 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
24 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
25 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
26 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29	.thumb
30	.syntax unified
31	.global __aeabi_memmove
32	.type	__aeabi_memmove, %function
33	ASM_ALIAS __aeabi_memmove4 __aeabi_memmove
34	ASM_ALIAS __aeabi_memmove8 __aeabi_memmove
35__aeabi_memmove:
36	cmp	r0, r1
37	push	{r4}
38	bls	3f
39	adds	r3, r1, r2
40	cmp	r0, r3
41	bcs	3f
42	adds	r1, r0, r2
43	cbz	r2, 2f
44	subs	r2, r3, r2
451:
46	ldrb	r4, [r3, #-1]!
47	cmp	r2, r3
48	strb	r4, [r1, #-1]!
49	bne	1b
502:
51	pop	{r4}
52	bx	lr
533:
54	cmp	r2, #0
55	beq	2b
56	add	r2, r2, r1
57	subs	r3, r0, #1
584:
59	ldrb	r4, [r1], #1
60	cmp	r2, r1
61	strb	r4, [r3, #1]!
62	bne	4b
63	pop	{r4}
64	bx	lr
65	.size __aeabi_memmove, . - __aeabi_memmove
66