kernel_optimize_test/arch/arm64/lib/copy_to_user.S
Catalin Marinas ada66f1837 arm64: Reorder the macro arguments in the copy routines
The current argument order is obviously buggy (memcpy.S):

	macro strb1 ptr, regB, val
	strb \ptr, [\regB], \val
	endm

However, it cancels out as the calling sites in copy_template.S pass the
address as the regB argument.

Mechanically reorder the arguments to match the instruction mnemonics.
There is no difference in objdump before and after this patch.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20200429183702.28445-1-catalin.marinas@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
2020-04-29 21:50:01 +01:00

68 lines
1.2 KiB
ArmAsm

/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2012 ARM Ltd.
*/
#include <linux/linkage.h>
#include <asm/asm-uaccess.h>
#include <asm/assembler.h>
#include <asm/cache.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 reg, ptr, val
ldrb \reg, [\ptr], \val
.endm
.macro strb1 reg, ptr, val
uao_user_alternative 9998f, strb, sttrb, \reg, \ptr, \val
.endm
.macro ldrh1 reg, ptr, val
ldrh \reg, [\ptr], \val
.endm
.macro strh1 reg, ptr, val
uao_user_alternative 9998f, strh, sttrh, \reg, \ptr, \val
.endm
.macro ldr1 reg, ptr, val
ldr \reg, [\ptr], \val
.endm
.macro str1 reg, ptr, val
uao_user_alternative 9998f, str, sttr, \reg, \ptr, \val
.endm
.macro ldp1 reg1, reg2, ptr, val
ldp \reg1, \reg2, [\ptr], \val
.endm
.macro stp1 reg1, reg2, ptr, val
uao_stp 9998f, \reg1, \reg2, \ptr, \val
.endm
end .req x5
SYM_FUNC_START(__arch_copy_to_user)
add end, x0, x2
#include "copy_template.S"
mov x0, #0
ret
SYM_FUNC_END(__arch_copy_to_user)
EXPORT_SYMBOL(__arch_copy_to_user)
.section .fixup,"ax"
.align 2
9998: sub x0, end, dst // bytes not copied
ret
.previous