[thirdparty/linux.git] / arch / arm64 / lib / memchr.S

/* 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
 */
WEAK(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
ENDPIPROC(memchr)
EXPORT_SYMBOL_NOKASAN(memchr)
Commit	Line	Data
caab277b	1	/* SPDX-License-Identifier: GPL-2.0-only */
4a899227 CM	2	/*
	3	* Based on arch/arm/lib/memchr.S
	4	*
	5	* Copyright (C) 1995-2000 Russell King
	6	* Copyright (C) 2013 ARM Ltd.
4a899227 CM	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	*/
19a2ca0f	22	WEAK(memchr)
4a899227 CM	23	and w1, w1, #0xff
	24	1: 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
	31	2: mov x0, #0
	32	ret
20791846	33	ENDPIPROC(memchr)
ac0e8c72	34	EXPORT_SYMBOL_NOKASAN(memchr)