| /* |
| * Based on arch/arm/lib/memchr.S |
| * |
| * Copyright (C) 1995-2000 Russell King |
| * Copyright (C) 2013 ARM Ltd. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include <linux/linkage.h> |
| #include <asm/assembler.h> |
| |
| /* |
| * Find a character in an area of memory. |
| * |
| * Parameters: |
| * x0 - buf |
| * x1 - c |
| * x2 - n |
| * Returns: |
| * x0 - address of first occurrence of 'c' or 0 |
| */ |
| WEAK(memchr) |
| and w1, w1, #0xff |
| 1: subs x2, x2, #1 |
| b.mi 2f |
| ldrb w3, [x0], #1 |
| cmp w3, w1 |
| b.ne 1b |
| sub x0, x0, #1 |
| ret |
| 2: mov x0, #0 |
| ret |
| ENDPIPROC(memchr) |