forked from Minki/linux
45 lines
1.0 KiB
ArmAsm
45 lines
1.0 KiB
ArmAsm
|
/*
|
||
|
|
* Based on arch/arm/lib/memchr.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 a character in an area of memory.
|
||
|
|
*
|
||
|
|
* Parameters:
|
||
|
|
* x0 - buf
|
||
|
|
* x1 - c
|
||
|
|
* x2 - n
|
||
|
|
* Returns:
|
||
|
|
* x0 - address of first occurrence of 'c' or 0
|
||
|
|
*/
|
||
|
|
ENTRY(memchr)
|
||
|
|
and w1, w1, #0xff
|
||
|
|
1: subs x2, x2, #1
|
||
|
|
b.mi 2f
|
||
|
|
ldrb w3, [x0], #1
|
||
|
|
cmp w3, w1
|
||
|
|
b.ne 1b
|
||
|
|
sub x0, x0, #1
|
||
|
|
ret
|
||
|
|
2: mov x0, #0
|
||
|
|
ret
|
||
|
|
ENDPROC(memchr)
|