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| /*
| * Based on arch/arm/lib/strchr.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 the first occurrence of a character in a string.
| *
| * Parameters:
| * x0 - str
| * x1 - c
| * Returns:
| * x0 - address of first occurrence of 'c' or 0
| */
| 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
| ENDPROC(strchr)
|
|
