74 lines
1.5 KiB
ArmAsm
74 lines
1.5 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2013 ARM Ltd.
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* Copyright (C) 2013 Linaro.
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*
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* This code is based on glibc cortex strings work originally authored by Linaro
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* be found @
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*
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* http://bazaar.launchpad.net/~linaro-toolchain-dev/cortex-strings/trunk/
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* files/head:/src/aarch64/
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*/
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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#include <asm/cache.h>
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#include <asm/asm-uaccess.h>
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/*
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* Copy a buffer from src to dest (alignment handled by the hardware)
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*
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* Parameters:
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* x0 - dest
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* x1 - src
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* x2 - n
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* Returns:
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* x0 - dest
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*/
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.macro ldrb1 reg, ptr, val
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KERNEL_ME_SAFE(9997f, ldrb \reg, [\ptr], \val)
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.endm
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.macro strb1 reg, ptr, val
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strb \reg, [\ptr], \val
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.endm
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.macro ldrh1 reg, ptr, val
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KERNEL_ME_SAFE(9997f, ldrh \reg, [\ptr], \val)
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.endm
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.macro strh1 reg, ptr, val
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strh \reg, [\ptr], \val
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.endm
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.macro ldr1 reg, ptr, val
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KERNEL_ME_SAFE(9997f, ldr \reg, [\ptr], \val)
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.endm
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.macro str1 reg, ptr, val
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str \reg, [\ptr], \val
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.endm
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.macro ldp1 reg1, reg2, ptr, val
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KERNEL_ME_SAFE(9997f, ldp \reg1, \reg2, [\ptr], \val)
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.endm
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.macro stp1 reg1, reg2, ptr, val
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stp \reg1, \reg2, [\ptr], \val
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.endm
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end .req x5
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SYM_FUNC_START(__memcpy_mc)
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add end, x0, x2
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#include "copy_template.S"
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mov x0, #0 // Nothing to copy
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ret
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// Exception fixups
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9997: sub x0, end, dst // bytes not copied
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ret
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SYM_FUNC_END(__memcpy_mc)
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EXPORT_SYMBOL(__memcpy_mc)
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SYM_FUNC_ALIAS_WEAK(memcpy_mc, __memcpy_mc)
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EXPORT_SYMBOL(memcpy_mc)
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