1/*
2 * Based on arch/arm/lib/strchr.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
21/*
22 * Find the first occurrence of a character in a string.
23 *
24 * Parameters:
25 *	x0 - str
26 *	x1 - c
27 * Returns:
28 *	x0 - address of first occurrence of 'c' or 0
29 */
30ENTRY(strchr)
31	and	w1, w1, #0xff
321:	ldrb	w2, [x0], #1
33	cmp	w2, w1
34	ccmp	w2, wzr, #4, ne
35	b.ne	1b
36	sub	x0, x0, #1
37	cmp	w2, w1
38	csel	x0, x0, xzr, eq
39	ret
40ENDPROC(strchr)
41