projects / mirror_ubuntu-zesty-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 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) |