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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/unicore32/lib/copy_from_user.S
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/*

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 * linux/arch/unicore32/lib/copy_from_user.S

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 *

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 * Code specific to PKUnity SoC and UniCore ISA

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 *

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 * Copyright (C) 2001-2010 GUAN Xue-tao

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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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#include <linux/linkage.h>

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#include <asm/assembler.h>

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/*

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 * Prototype:

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 *

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 *	size_t __copy_from_user(void *to, const void *from, size_t n)

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 *

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 * Purpose:

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 *

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 *	copy a block to kernel memory from user memory

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 *

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 * Params:

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 *

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 *	to = kernel memory

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 *	from = user memory

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 *	n = number of bytes to copy

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 *

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 * Return value:

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 *

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 *	Number of bytes NOT copied.

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 */

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	.macro ldr1w ptr reg abort

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	ldrusr	\reg, \ptr, 4, abort=\abort

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	.endm

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	.macro ldr4w ptr reg1 reg2 reg3 reg4 abort

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100:	ldm.w	(\reg1, \reg2, \reg3, \reg4), [\ptr]+

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	.pushsection __ex_table, "a"

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	.align	3

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	.long 100b, \abort

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	.popsection

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	.endm

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	.macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort

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100:	ldm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+

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	.pushsection __ex_table, "a"

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	.align	3

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	.long 100b, \abort

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	.popsection

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	.endm

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	.macro ldr1b ptr reg cond=al abort

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	ldrusr	\reg, \ptr, 1, \cond, abort=\abort

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	.endm

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	.macro str1w ptr reg abort

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	stw.w \reg, [\ptr]+, #4

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	.endm

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	.macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort

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	stm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+

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	.endm

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	.macro str1b ptr reg cond=al abort

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	.ifnc	\cond, al

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	b\cond	201f

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	b	202f

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	.endif

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201:	stb.w \reg, [\ptr]+, #1

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202:

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	.endm

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	.macro enter

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	mov	r3, #0

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	stm.w	(r0, r2, r3), [sp-]

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	.endm

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	.macro exit

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	add	sp, sp, #8

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	ldm.w	(r0), [sp]+

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	mov	pc, lr

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	.endm

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	.text

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ENTRY(__copy_from_user)

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#include "copy_template.S"

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ENDPROC(__copy_from_user)

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	.pushsection .fixup,"ax"

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	.align 0

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	copy_abort_preamble

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	ldm.w	(r1, r2), [sp]+

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	sub	r3, r0, r1

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	rsub	r2, r3, r2

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	stw	r2, [sp]

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	mov	r1, #0

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	b.l	memset

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	ldw.w	r0, [sp]+, #4

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	copy_abort_end

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	.popsection

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