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/*

 *  linux/arch/arm/lib/strncpy_from_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

/*

 * Copy a string from user space to kernel space.

 *  r0 = dst, r1 = src, r2 = byte length

 * returns the number of characters copied (strlen of copied string),

 *  -EFAULT on exception, or "len" if we fill the whole buffer

 */

ENTRY(__arch_strncpy_from_user)

        save_lr

        mov     ip, r1

1:      subs    r2, r2, #1

USER(   ldrplbt r3, [r1], #1)

        bmi     2f

        strb    r3, [r0], #1

        teq     r3, #0

        bne     1b

        sub     r1, r1, #1      @ take NUL character out of count

2:      sub     r0, r1, ip

        restore_pc

        .section .fixup,"ax"

        .align  0

9001:   mov     r3, #0

        strb    r3, [r0, #0]    @ null terminate

        mov     r0, #-EFAULT

        restore_pc

        .previous