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2b8cac81 CM |
1 | /* |
2 | * Based on arch/arm/lib/strchr.S | |
3 | * | |
4 | * Copyright (C) 1995-2000 Russell King | |
5 | * Copyright (C) 2013 ARM Ltd. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include <linux/linkage.h> | |
21 | #include <asm/assembler.h> | |
22 | ||
23 | /* | |
24 | * Find the first occurrence of a character in a string. | |
25 | * | |
26 | * Parameters: | |
27 | * x0 - str | |
28 | * x1 - c | |
29 | * Returns: | |
30 | * x0 - address of first occurrence of 'c' or 0 | |
31 | */ | |
32 | ENTRY(strchr) | |
33 | and w1, w1, #0xff | |
34 | 1: ldrb w2, [x0], #1 | |
35 | cmp w2, w1 | |
36 | ccmp w2, wzr, #4, ne | |
37 | b.ne 1b | |
38 | sub x0, x0, #1 | |
39 | cmp w2, w1 | |
40 | csel x0, x0, xzr, eq | |
41 | ret | |
42 | ENDPROC(strchr) |