| /* SPDX-License-Identifier: GPL-2.0-only */ | |
| /* | |
| * Based on arch/arm/lib/strchr.S | |
| * | |
| * Copyright (C) 1995-2000 Russell King | |
| * Copyright (C) 2013 ARM Ltd. | |
| */ | |
| #include <linux/linkage.h> | |
| #include <asm/assembler.h> | |
| /* | |
| * Find the first occurrence of a character in a string. | |
| * | |
| * Parameters: | |
| * x0 - str | |
| * x1 - c | |
| * Returns: | |
| * x0 - address of first occurrence of 'c' or 0 | |
| */ | |
| SYM_FUNC_START_WEAK(strchr) | |
| and w1, w1, #0xff | |
| 1: ldrb w2, [x0], #1 | |
| cmp w2, w1 | |
| ccmp w2, wzr, #4, ne | |
| b.ne 1b | |
| sub x0, x0, #1 | |
| cmp w2, w1 | |
| csel x0, x0, xzr, eq | |
| ret | |
| SYM_FUNC_END(strchr) | |
| EXPORT_SYMBOL_NOKASAN(strchr) |