| Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame^] | 1 | /* |
| 2 | * Based on arch/arm/lib/memchr.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 a character in an area of memory. |
| 25 | * |
| 26 | * Parameters: |
| 27 | * x0 - buf |
| 28 | * x1 - c |
| 29 | * x2 - n |
| 30 | * Returns: |
| 31 | * x0 - address of first occurrence of 'c' or 0 |
| 32 | */ |
| 33 | ENTRY(memchr) |
| 34 | and w1, w1, #0xff |
| 35 | 1: subs x2, x2, #1 |
| 36 | b.mi 2f |
| 37 | ldrb w3, [x0], #1 |
| 38 | cmp w3, w1 |
| 39 | b.ne 1b |
| 40 | sub x0, x0, #1 |
| 41 | ret |
| 42 | 2: mov x0, #0 |
| 43 | ret |
| 44 | ENDPIPROC(memchr) |