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

/*
 * 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