1/*
2 * linux/arch/unicore32/lib/strnlen_user.S
3 *
4 * Code specific to PKUnity SoC and UniCore ISA
5 *
6 * Copyright (C) 2001-2010 GUAN Xue-tao
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12#include <linux/linkage.h>
13#include <asm/assembler.h>
14#include <asm/errno.h>
15
16	.text
17	.align	5
18
19/* Prototype: unsigned long __strnlen_user(const char *str, long n)
20 * Purpose  : get length of a string in user memory
21 * Params   : str - address of string in user memory
22 * Returns  : length of string *including terminator*
23 *	      or zero on exception, or n + 1 if too long
24 */
25ENTRY(__strnlen_user)
26	mov	r2, r0
271:
28	ldrusr	r3, r0, 1
29	cxor.a	r3, #0
30	beq	2f
31	sub.a	r1, r1, #1
32	bne	1b
33	add	r0, r0, #1
342:	sub	r0, r0, r2
35	mov	pc, lr
36ENDPROC(__strnlen_user)
37
38	.pushsection .fixup,"ax"
39	.align	0
409001:	mov	r0, #0
41	mov	pc, lr
42	.popsection
43