tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Based on arch/arm/lib/memchr.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 a character in an area of memory.
14 *
15 * Parameters:
16 * x0 - buf
17 * x1 - c
18 * x2 - n
19 * Returns:
20 * x0 - address of first occurrence of 'c' or 0
21 */
22WEAK(memchr)
23 and w1, w1, #0xff
241: subs x2, x2, #1
25 b.mi 2f
26 ldrb w3, [x0], #1
27 cmp w3, w1
28 b.ne 1b
29 sub x0, x0, #1
30 ret
312: mov x0, #0
32 ret
33ENDPIPROC(memchr)
34EXPORT_SYMBOL_NOKASAN(memchr)