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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | /* $Id: memset.S,v 1.1 2000/04/14 16:49:01 mjd Exp $ |
3 | * | |
4 | * "memset" implementation of SuperH | |
5 | * | |
6 | * Copyright (C) 1999 Niibe Yutaka | |
7 | * | |
8 | */ | |
9 | ||
10 | /* | |
11 | * void *memset(void *s, int c, size_t n); | |
12 | */ | |
13 | ||
14 | #include <linux/linkage.h> | |
15 | ||
16 | ENTRY(memset) | |
17 | tst r6,r6 | |
18 | bt/s 5f ! if n=0, do nothing | |
19 | add r6,r4 | |
20 | mov #12,r0 | |
21 | cmp/gt r6,r0 | |
22 | bt/s 4f ! if it's too small, set a byte at once | |
23 | mov r4,r0 | |
24 | and #3,r0 | |
25 | cmp/eq #0,r0 | |
26 | bt/s 2f ! It's aligned | |
27 | sub r0,r6 | |
28 | 1: | |
29 | dt r0 | |
30 | bf/s 1b | |
31 | mov.b r5,@-r4 | |
32 | 2: ! make VVVV | |
e7be853d | 33 | extu.b r5,r5 |
1da177e4 LT |
34 | swap.b r5,r0 ! V0 |
35 | or r0,r5 ! VV | |
36 | swap.w r5,r0 ! VV00 | |
37 | or r0,r5 ! VVVV | |
38 | ! | |
39 | mov r6,r0 | |
40 | shlr2 r0 | |
41 | shlr r0 ! r0 = r6 >> 3 | |
42 | 3: | |
43 | dt r0 | |
44 | mov.l r5,@-r4 ! set 8-byte at once | |
45 | bf/s 3b | |
46 | mov.l r5,@-r4 | |
47 | ! | |
48 | mov #7,r0 | |
49 | and r0,r6 | |
50 | tst r6,r6 | |
51 | bt 5f | |
52 | ! fill bytes | |
53 | 4: | |
54 | dt r6 | |
55 | bf/s 4b | |
56 | mov.b r5,@-r4 | |
57 | 5: | |
58 | rts | |
59 | mov r4,r0 |