/* SPDX-License-Identifier: GPL-2.0-only */ | |
/* | |
* Based on arch/arm/lib/memchr.S | |
* | |
* Copyright (C) 1995-2000 Russell King | |
* Copyright (C) 2013 ARM Ltd. | |
*/ | |
#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 | |
*/ | |
SYM_FUNC_START_WEAK_PI(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 | |
SYM_FUNC_END_PI(memchr) | |
EXPORT_SYMBOL_NOKASAN(memchr) |