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

        .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