Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

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

 *

 *  Author:     Nicolas Pitre

 *  Created:    Sep 29, 2005

 *  Copyright:  MontaVista Software, Inc.

 *

 *  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 

/*

 * Prototype:

 *

 *      size_t __copy_from_user(void *to, const void *from, size_t n)

 *

 * Purpose:

 *

 *      copy a block to kernel memory from user memory

 *

 * Params:

 *

 *      to = kernel memory

 *      from = user memory

 *      n = number of bytes to copy

 *

 * Return value:

 *

 *      Number of bytes NOT copied.

 */

        .macro ldr1w ptr reg abort

100:    ldrt \reg, [\ptr], #4

        .section __ex_table, "a"

        .long 100b, \abort

        .previous

        .endm

        .macro ldr4w ptr reg1 reg2 reg3 reg4 abort

        ldr1w \ptr, \reg1, \abort

        ldr1w \ptr, \reg2, \abort

        ldr1w \ptr, \reg3, \abort

        ldr1w \ptr, \reg4, \abort

        .endm

        .macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort

        ldr4w \ptr, \reg1, \reg2, \reg3, \reg4, \abort

        ldr4w \ptr, \reg5, \reg6, \reg7, \reg8, \abort

        .endm

        .macro ldr1b ptr reg cond=al abort

100:    ldr\cond\()bt \reg, [\ptr], #1

        .section __ex_table, "a"

        .long 100b, \abort

        .previous

        .endm

        .macro str1w ptr reg abort

        str \reg, [\ptr], #4

        .endm

        .macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort

        stmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8}

        .endm

        .macro str1b ptr reg cond=al abort

        str\cond\()b \reg, [\ptr], #1

        .endm

        .macro enter reg1 reg2

        mov     r3, #0

        stmdb   sp!, {r0, r2, r3, \reg1, \reg2}

        .endm

        .macro exit reg1 reg2

        add     sp, sp, #8

        ldmfd   sp!, {r0, \reg1, \reg2}

        .endm

        .text

ENTRY(__copy_from_user)

#include "copy_template.S"

        .section .fixup,"ax"

        .align 0

        copy_abort_preamble

        ldmfd   sp!, {r1, r2}

        sub     r3, r0, r1

        rsb     r1, r3, r2

        str     r1, [sp]

        bl      __memzero

        ldr     r0, [sp], #4

        copy_abort_end

        .previous