Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * Copy to/from userspace with optional address space checking.

 *

 * Copyright 2004-2006 Atmel Corporation

 *

 * 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 

#include 

        .text

        .align  1

        .global strnlen_user

        .type   strnlen_user, "function"

strnlen_user:

        branch_if_kernel r8, __strnlen_user

        sub     r8, r11, 1

        add     r8, r12

        retcs   0

        brmi    adjust_length   /* do a closer inspection */

        .global __strnlen_user

        .type   __strnlen_user, "function"

__strnlen_user:

        mov     r10, r12

10:     ld.ub   r8, r12++

        cp.w    r8, 0

        breq    2f

        sub     r11, 1

        brne    10b

        sub     r12, -1

2:      sub     r12, r10

        retal   r12

        .type   adjust_length, "function"

adjust_length:

        cp.w    r12, 0          /* addr must always be < TASK_SIZE */

        retmi   0

        pushm   lr

        lddpc   lr, _task_size

        sub     r11, lr, r12

        mov     r9, r11

        rcall   __strnlen_user

        cp.w    r12, r9

        brgt    1f

        popm    pc

1:      popm    pc, r12=0

        .align  2

_task_size:

        .long   TASK_SIZE

        .section .fixup, "ax"

        .align  1

19:     retal   0

        .section __ex_table, "a"

        .align  2

        .long   10b, 19b