1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Based on arch/arm/lib/strchr.S
4 *
5 * Copyright (C) 1995-2000 Russell King
6 * Copyright (C) 2013 ARM Ltd.
7 */
8
9 #include <linux/linkage.h>
10 #include <asm/assembler.h>
11
12 /*
13 * Find the first occurrence of a character in
14 *
15 * Parameters:
16 * x0 - str
17 * x1 - c
18 * Returns:
19 * x0 - address of first occurrence of 'c
20 */
21 SYM_FUNC_START(__pi_strchr)
22 and w1, w1, #0xff
23 1: ldrb w2, [x0], #1
24 cmp w2, w1
25 ccmp w2, wzr, #4, ne
26 b.ne 1b
27 sub x0, x0, #1
28 cmp w2, w1
29 csel x0, x0, xzr, eq
30 ret
31 SYM_FUNC_END(__pi_strchr)
32
33 SYM_FUNC_ALIAS_WEAK(strchr, __pi_strchr)
34 EXPORT_SYMBOL_NOKASAN(strchr)
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