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/*

 *  linux/arch/arm/lib/strnlen_user.S

 *

 *  Copyright (C) 1995-2000 Russell King

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */

#include 

#include 

#include 

        .text

        .align  5

/* Prototype: unsigned long __arch_strnlen_user(const char *str, long n)

 * Purpose  : get length of a string in user memory

 * Params   : str - address of string in user memory

 * Returns  : length of string *including terminator*

 *            or zero on exception, or n + 1 if too long

 */

ENTRY(__arch_strnlen_user)

        save_lr

        mov     r2, r0

1:

USER(   ldrbt   r3, [r0], #1)

        teq     r3, #0

        beq     2f

        subs    r1, r1, #1

        bne     1b

        add     r0, r0, #1

2:      sub     r0, r0, r2

        restore_pc

        .section .fixup,"ax"

        .align  0

9001:   mov     r0, #0

        restore_pc

        .previous