| Catalin Marinas | 2b8cac8 | 2013-03-21 16:23:43 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Based on arch/arm/lib/strrchr.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 last occurrence of a character in a string. |
| 25 | * |
| 26 | * Parameters: |
| 27 | * x0 - str |
| 28 | * x1 - c |
| 29 | * Returns: |
| 30 | * x0 - address of last occurrence of 'c' or 0 |
| 31 | */ |
| 32 | ENTRY(strrchr) |
| 33 | mov x3, #0 |
| 34 | and w1, w1, #0xff |
| 35 | 1: ldrb w2, [x0], #1 |
| 36 | cbz w2, 2f |
| 37 | cmp w2, w1 |
| 38 | b.ne 1b |
| 39 | sub x3, x0, #1 |
| 40 | b 1b |
| 41 | 2: mov x0, x3 |
| 42 | ret |
| 43 | ENDPROC(strrchr) |