swh:1:snp:32555a3fd8878f019c2ebd6c964bc1edcaeff337
Tip revision: 8e4921515c1a379539607eb443d51c30f4f7f338 authored by Linus Torvalds on 08 February 2009, 20:37:20 UTC
Linux 2.6.29-rc4
Linux 2.6.29-rc4
Tip revision: 8e49215
copy_to_user.S
/*
* linux/arch/arm/lib/copy_to_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_to_user(void *to, const void *from, size_t n)
*
* Purpose:
*
* copy a block to user memory from kernel memory
*
* Params:
*
* to = user memory
* from = kernel memory
* n = number of bytes to copy
*
* Return value:
*
* Number of bytes NOT copied.
*/
.macro ldr1w ptr reg abort
ldr \reg, [\ptr], #4
.endm
.macro ldr4w ptr reg1 reg2 reg3 reg4 abort
ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4}
.endm
.macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8}
.endm
.macro ldr1b ptr reg cond=al abort
ldr\cond\()b \reg, [\ptr], #1
.endm
.macro str1w ptr reg abort
100: strt \reg, [\ptr], #4
.section __ex_table, "a"
.long 100b, \abort
.previous
.endm
.macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
str1w \ptr, \reg1, \abort
str1w \ptr, \reg2, \abort
str1w \ptr, \reg3, \abort
str1w \ptr, \reg4, \abort
str1w \ptr, \reg5, \abort
str1w \ptr, \reg6, \abort
str1w \ptr, \reg7, \abort
str1w \ptr, \reg8, \abort
.endm
.macro str1b ptr reg cond=al abort
100: str\cond\()bt \reg, [\ptr], #1
.section __ex_table, "a"
.long 100b, \abort
.previous
.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_to_user)
#include "copy_template.S"
ENDPROC(__copy_to_user)
.section .fixup,"ax"
.align 0
copy_abort_preamble
ldmfd sp!, {r1, r2, r3}
sub r0, r0, r1
rsb r0, r0, r2
copy_abort_end
.previous