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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | /* $Id: strlen.S,v 1.2 2001/06/29 14:07:15 gniibe Exp $ |
3 | * | |
4 | * "strlen" implementation of SuperH | |
5 | * | |
6 | * Copyright (C) 1999 Kaz Kojima | |
7 | * | |
8 | */ | |
9 | ||
10 | /* size_t strlen (const char *s) */ | |
11 | ||
12 | #include <linux/linkage.h> | |
13 | ENTRY(strlen) | |
14 | mov r4,r0 | |
15 | and #3,r0 | |
16 | tst r0,r0 | |
17 | bt/s 1f | |
18 | mov #0,r2 | |
19 | ||
20 | add #-1,r0 | |
21 | shll2 r0 | |
22 | shll r0 | |
23 | braf r0 | |
24 | nop | |
25 | ||
26 | mov.b @r4+,r1 | |
27 | tst r1,r1 | |
28 | bt 8f | |
29 | add #1,r2 | |
30 | ||
31 | mov.b @r4+,r1 | |
32 | tst r1,r1 | |
33 | bt 8f | |
34 | add #1,r2 | |
35 | ||
36 | mov.b @r4+,r1 | |
37 | tst r1,r1 | |
38 | bt 8f | |
a5c43003 | 39 | add #1,r2 |
1da177e4 LT |
40 | |
41 | 1: | |
42 | mov #0,r3 | |
43 | 2: | |
44 | mov.l @r4+,r1 | |
45 | cmp/str r3,r1 | |
46 | bf/s 2b | |
47 | add #4,r2 | |
48 | ||
49 | add #-4,r2 | |
50 | #ifndef __LITTLE_ENDIAN__ | |
51 | swap.b r1,r1 | |
52 | swap.w r1,r1 | |
53 | swap.b r1,r1 | |
54 | #endif | |
55 | extu.b r1,r0 | |
56 | tst r0,r0 | |
57 | bt/s 8f | |
58 | shlr8 r1 | |
59 | add #1,r2 | |
60 | extu.b r1,r0 | |
61 | tst r0,r0 | |
62 | bt/s 8f | |
63 | shlr8 r1 | |
64 | add #1,r2 | |
65 | extu.b r1,r0 | |
66 | tst r0,r0 | |
67 | bt 8f | |
68 | add #1,r2 | |
69 | 8: | |
70 | rts | |
71 | mov r2,r0 |