84 lines
1.9 KiB
ArmAsm
84 lines
1.9 KiB
ArmAsm
/*
|
|
* Copyright (C) 2012 ARM Ltd.
|
|
*
|
|
* 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.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
|
|
#include <asm/alternative.h>
|
|
#include <asm/assembler.h>
|
|
#include <asm/cache.h>
|
|
#include <asm/cpufeature.h>
|
|
#include <asm/sysreg.h>
|
|
|
|
/*
|
|
* Copy to user space from a kernel buffer (alignment handled by the hardware)
|
|
*
|
|
* Parameters:
|
|
* x0 - to
|
|
* x1 - from
|
|
* x2 - n
|
|
* Returns:
|
|
* x0 - bytes not copied
|
|
*/
|
|
.macro ldrb1 ptr, regB, val
|
|
ldrb \ptr, [\regB], \val
|
|
.endm
|
|
|
|
.macro strb1 ptr, regB, val
|
|
USER(9998f, strb \ptr, [\regB], \val)
|
|
.endm
|
|
|
|
.macro ldrh1 ptr, regB, val
|
|
ldrh \ptr, [\regB], \val
|
|
.endm
|
|
|
|
.macro strh1 ptr, regB, val
|
|
USER(9998f, strh \ptr, [\regB], \val)
|
|
.endm
|
|
|
|
.macro ldr1 ptr, regB, val
|
|
ldr \ptr, [\regB], \val
|
|
.endm
|
|
|
|
.macro str1 ptr, regB, val
|
|
USER(9998f, str \ptr, [\regB], \val)
|
|
.endm
|
|
|
|
.macro ldp1 ptr, regB, regC, val
|
|
ldp \ptr, \regB, [\regC], \val
|
|
.endm
|
|
|
|
.macro stp1 ptr, regB, regC, val
|
|
USER(9998f, stp \ptr, \regB, [\regC], \val)
|
|
.endm
|
|
|
|
end .req x5
|
|
ENTRY(__copy_to_user)
|
|
ALTERNATIVE("nop", __stringify(SET_PSTATE_PAN(0)), ARM64_HAS_PAN, \
|
|
CONFIG_ARM64_PAN)
|
|
add end, x0, x2
|
|
#include "copy_template.S"
|
|
ALTERNATIVE("nop", __stringify(SET_PSTATE_PAN(1)), ARM64_HAS_PAN, \
|
|
CONFIG_ARM64_PAN)
|
|
mov x0, #0
|
|
ret
|
|
ENDPROC(__copy_to_user)
|
|
|
|
.section .fixup,"ax"
|
|
.align 2
|
|
9998: sub x0, end, dst // bytes not copied
|
|
ret
|
|
.previous
|