[mirror_ubuntu-jammy-kernel.git] / arch / arm64 / lib / strrchr.S

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

#include <linux/linkage.h>
#include <asm/assembler.h>

/*
 * Find the last occurrence of a character in a string.
 *
 * Parameters:
 *	x0 - str
 *	x1 - c
 * Returns:
 *	x0 - address of last occurrence of 'c' or 0
 */
WEAK(strrchr)
	mov	x3, #0
	and	w1, w1, #0xff
1:	ldrb	w2, [x0], #1
	cbz	w2, 2f
	cmp	w2, w1
	b.ne	1b
	sub	x3, x0, #1
	b	1b
2:	mov	x0, x3
	ret
ENDPIPROC(strrchr)
EXPORT_SYMBOL_NOKASAN(strrchr)
Commit	Line	Data
caab277b	1	/* SPDX-License-Identifier: GPL-2.0-only */
2b8cac81 CM	2	/*
	3	* Based on arch/arm/lib/strrchr.S
	4	*
	5	* Copyright (C) 1995-2000 Russell King
	6	* Copyright (C) 2013 ARM Ltd.
2b8cac81 CM	7	*/
	8
	9	#include <linux/linkage.h>
	10	#include <asm/assembler.h>
	11
	12	/*
	13	* Find the last occurrence of a character in a string.
	14	*
	15	* Parameters:
	16	* x0 - str
	17	* x1 - c
	18	* Returns:
	19	* x0 - address of last occurrence of 'c' or 0
	20	*/
19a2ca0f	21	WEAK(strrchr)
2b8cac81 CM	22	mov x3, #0
	23	and w1, w1, #0xff
	24	1: ldrb w2, [x0], #1
	25	cbz w2, 2f
	26	cmp w2, w1
	27	b.ne 1b
	28	sub x3, x0, #1
	29	b 1b
	30	2: mov x0, x3
	31	ret
fdfb69a7	32	ENDPIPROC(strrchr)
ac0e8c72	33	EXPORT_SYMBOL_NOKASAN(strrchr)