97 lines
1.8 KiB
ArmAsm
97 lines
1.8 KiB
ArmAsm
/*
|
|
* linux/arch/unicore32/lib/copy_to_user.S
|
|
*
|
|
* Code specific to PKUnity SoC and UniCore ISA
|
|
*
|
|
* Copyright (C) 2001-2010 GUAN Xue-tao
|
|
*
|
|
* 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
|
|
ldw.w \reg, [\ptr]+, #4
|
|
.endm
|
|
|
|
.macro ldr4w ptr reg1 reg2 reg3 reg4 abort
|
|
ldm.w (\reg1, \reg2, \reg3, \reg4), [\ptr]+
|
|
.endm
|
|
|
|
.macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
|
|
ldm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+
|
|
.endm
|
|
|
|
.macro ldr1b ptr reg cond=al abort
|
|
notcond \cond, .+8
|
|
ldb.w \reg, [\ptr]+, #1
|
|
.endm
|
|
|
|
.macro str1w ptr reg abort
|
|
strusr \reg, \ptr, 4, abort=\abort
|
|
.endm
|
|
|
|
.macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
|
|
100: stm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+
|
|
|
|
.pushsection __ex_table, "a"
|
|
.long 100b, \abort
|
|
.popsection
|
|
.endm
|
|
|
|
.macro str1b ptr reg cond=al abort
|
|
strusr \reg, \ptr, 1, \cond, abort=\abort
|
|
.endm
|
|
|
|
.macro enter
|
|
mov r3, #0
|
|
stm.w (r0, r2, r3), [sp-]
|
|
.endm
|
|
|
|
.macro exit
|
|
add sp, sp, #8
|
|
ldm.w (r0), [sp]+
|
|
mov pc, lr
|
|
.endm
|
|
|
|
.text
|
|
|
|
WEAK(__copy_to_user)
|
|
|
|
#include "copy_template.S"
|
|
|
|
ENDPROC(__copy_to_user)
|
|
|
|
.pushsection .fixup,"ax"
|
|
.align 0
|
|
copy_abort_preamble
|
|
ldm.w (r1, r2, r3), [sp]+
|
|
sub r0, r0, r1
|
|
rsub r0, r0, r2
|
|
copy_abort_end
|
|
.popsection
|
|
|