1/*
 2 *  linux/arch/arm/lib/strnlen_user.S
 3 *
 4 *  Copyright (C) 1995-2000 Russell King
 5 *
 6 * This program is free software; you can redistribute it and/or modify
 7 * it under the terms of the GNU General Public License version 2 as
 8 * published by the Free Software Foundation.
 9 */
10#include <linux/linkage.h>
11#include <asm/assembler.h>
12#include <asm/errno.h>
13
14	.text
15	.align	5
16
17/* Prototype: unsigned long __strnlen_user(const char *str, long n)
18 * Purpose  : get length of a string in user memory
19 * Params   : str - address of string in user memory
20 * Returns  : length of string *including terminator*
21 *	      or zero on exception, or n + 1 if too long
22 */
23ENTRY(__strnlen_user)
24	mov	r2, r0
251:
26	ldrusr	r3, r0, 1
27	teq	r3, #0
28	beq	2f
29	subs	r1, r1, #1
30	bne	1b
31	add	r0, r0, #1
322:	sub	r0, r0, r2
33	mov	pc, lr
34ENDPROC(__strnlen_user)
35
36	.pushsection .fixup,"ax"
37	.align	0
389001:	mov	r0, #0
39	mov	pc, lr
40	.popsection