memchr.s

来自「这是一个SIGMA方案的PMP播放器的UCLINUX程序,可播放DVD,VCD,」· S 代码 · 共 26 行

/*
 *  linux/arch/arm/lib/memchr.S
 *
 *  Copyright (C) 1995-2000 Russell King
 *
 * 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.
 *
 *  ASM optimised string functions
 */
#include <linux/linkage.h>
#include <asm/assembler.h>

	.text
	.align	5
ENTRY(memchr)
1:	ldrb	r3, [r0], #1
	teq	r3, r1
	beq	2f
	subs	r2, r2, #1
	bpl	1b
2:	movne	r0, #0
	subeq	r0, r0, #1
	RETINSTR(mov,pc,lr)