source: trunk/libs/newlib/src/newlib/libc/machine/arm/aeabi_memmove-thumb2.S @ 444

Last change on this file since 444 was 444, checked in by satin@…, 6 years ago

add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc

File size: 2.0 KB
Line 
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
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