forked from Minki/linux
56c08ec516
For a while now it's been possible to use EXPORT_SYMBOL() in assembly files, which allows us to place exports immediately after assembly functions, as we do for C functions. As a step towards removing arm64ksyms.c, let's move the uaccess exports to the assembly files the functions are defined in. As we have to include <asm/assembler.h>, the existing includes are fixed to follow the usual ordering conventions. There should be no functional change as a result of this patch. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
82 lines
1.8 KiB
ArmAsm
82 lines
1.8 KiB
ArmAsm
/*
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* Copyright (C) 2012 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/linkage.h>
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#include <asm/asm-uaccess.h>
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#include <asm/assembler.h>
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#include <asm/cache.h>
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/*
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* Copy from user space to a kernel buffer (alignment handled by the hardware)
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*
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* Parameters:
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* x0 - to
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* x1 - from
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* x2 - n
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* Returns:
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* x0 - bytes not copied
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*/
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.macro ldrb1 ptr, regB, val
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uao_user_alternative 9998f, ldrb, ldtrb, \ptr, \regB, \val
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.endm
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.macro strb1 ptr, regB, val
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strb \ptr, [\regB], \val
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.endm
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.macro ldrh1 ptr, regB, val
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uao_user_alternative 9998f, ldrh, ldtrh, \ptr, \regB, \val
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.endm
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.macro strh1 ptr, regB, val
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strh \ptr, [\regB], \val
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.endm
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.macro ldr1 ptr, regB, val
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uao_user_alternative 9998f, ldr, ldtr, \ptr, \regB, \val
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.endm
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.macro str1 ptr, regB, val
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str \ptr, [\regB], \val
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.endm
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.macro ldp1 ptr, regB, regC, val
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uao_ldp 9998f, \ptr, \regB, \regC, \val
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.endm
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.macro stp1 ptr, regB, regC, val
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stp \ptr, \regB, [\regC], \val
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.endm
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end .req x5
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ENTRY(__arch_copy_from_user)
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uaccess_enable_not_uao x3, x4, x5
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add end, x0, x2
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#include "copy_template.S"
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uaccess_disable_not_uao x3, x4
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mov x0, #0 // Nothing to copy
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ret
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ENDPROC(__arch_copy_from_user)
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EXPORT_SYMBOL(__arch_copy_from_user)
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.section .fixup,"ax"
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.align 2
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9998: sub x0, end, dst // bytes not copied
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ret
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.previous
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