source: trunk/libs/newlib/src/newlib/libc/machine/arm/aeabi_memset-thumb.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: 2.7 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_memset
32        .type   __aeabi_memset, %function
33        ASM_ALIAS __aeabi_memset4 __aeabi_memset
34        ASM_ALIAS __aeabi_memset8 __aeabi_memset
35__aeabi_memset:
36        push    {r4, r5, r6, lr}
37        lsls    r3, r0, #30
38        beq     10f
39        subs    r4, r1, #1
40        cmp     r1, #0
41        beq     9f
42        lsls    r5, r2, #24
43        lsrs    r5, r5, #24
44        movs    r3, r0
45        movs    r6, #3
46        b       2f
471:
48        subs    r1, r4, #1
49        cmp     r4, #0
50        beq     9f
51        movs    r4, r1
522:
53        adds    r3, r3, #1
54        subs    r1, r3, #1
55        strb    r5, [r1]
56        tst     r3, r6
57        bne     1b
583:
59        cmp     r4, #3
60        bls     7f
61        movs    r5, #255
62        ands    r5, r2
63        lsls    r1, r5, #8
64        orrs    r5, r1
65        lsls    r1, r5, #16
66        orrs    r5, r1
67        cmp     r4, #15
68        bls     5f
69        movs    r6, r4
70        subs    r6, r6, #16
71        lsrs    r6, r6, #4
72        adds    r6, r6, #1
73        lsls    r6, r6, #4
74        movs    r1, r3
75        adds    r3, r3, r6
764:
77        str     r5, [r1]
78        str     r5, [r1, #4]
79        str     r5, [r1, #8]
80        str     r5, [r1, #12]
81        adds    r1, r1, #16
82        cmp     r3, r1
83        bne     4b
84        movs    r1, #15
85        ands    r4, r1
86        cmp     r4, #3
87        bls     7f
885:
89        subs    r6, r4, #4
90        lsrs    r6, r6, #2
91        adds    r6, r6, #1
92        lsls    r6, r6, #2
93        movs    r1, r3
94        adds    r3, r3, r6
956:
96        stmia   r1!, {r5}
97        cmp     r3, r1
98        bne     6b
99        movs    r1, #3
100        ands    r4, r1
1017:
102        cmp     r4, #0
103        beq     9f
104        lsls    r2, r2, #24
105        lsrs    r2, r2, #24
106        adds    r4, r3, r4
1078:
108        strb    r2, [r3]
109        adds    r3, r3, #1
110        cmp     r4, r3
111        bne     8b
1129:
113        pop     {r4, r5, r6}
114        pop     {r1}
115        bx      r1
11610:
117        movs    r3, r0
118        movs    r4, r1
119        b       3b
120        .size __aeabi_memset, . - __aeabi_memset
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