[mirror_ubuntu-focal-kernel.git] / arch / sh / lib64 / strlen.S

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Simplistic strlen() implementation for SHmedia.
 *
 * Copyright (C) 2003  Paul Mundt <lethal@linux-sh.org>
 */

	.section .text..SHmedia32,"ax"
	.globl	strlen
	.type	strlen,@function

	.balign 16
strlen:
	ptabs	r18, tr4

	/*
	 * Note: We could easily deal with the NULL case here with a simple
	 * sanity check, though it seems that the behavior we want is to fault
	 * in the event that r2 == NULL, so we don't bother.
	 */
/*	beqi    r2, 0, tr4 */	! Sanity check

	movi	-1, r0
	pta/l	loop, tr0
loop:
	ld.b	r2, 0, r1
	addi	r2, 1, r2
	addi	r0, 1, r0
	bnei/l	r1, 0, tr0

	or	r0, r63, r2
	blink	tr4, r63

	.size	strlen,.-strlen
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
4466b20c PM	2	/*
	3	* Simplistic strlen() implementation for SHmedia.
	4	*
	5	* Copyright (C) 2003 Paul Mundt <lethal@linux-sh.org>
	6	*/
	7
	8	.section .text..SHmedia32,"ax"
	9	.globl strlen
	10	.type strlen,@function
	11
	12	.balign 16
	13	strlen:
	14	ptabs r18, tr4
	15
	16	/*
	17	* Note: We could easily deal with the NULL case here with a simple
	18	* sanity check, though it seems that the behavior we want is to fault
	19	* in the event that r2 == NULL, so we don't bother.
	20	*/
	21	/* beqi r2, 0, tr4 */ ! Sanity check
	22
	23	movi -1, r0
	24	pta/l loop, tr0
	25	loop:
	26	ld.b r2, 0, r1
	27	addi r2, 1, r2
	28	addi r0, 1, r0
	29	bnei/l r1, 0, tr0
	30
	31	or r0, r63, r2
	32	blink tr4, r63
	33
	34	.size strlen,.-strlen