| /* | |
| * 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 | |
| */ | |
| ENTRY(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) |