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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/sparc/lib/copy_in_user.S
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/* copy_in_user.S: Copy from userspace to userspace.

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 *

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 * Copyright (C) 1999, 2000, 2004 David S. Miller ([email protected])

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 */

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#include <linux/linkage.h>

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#include <asm/asi.h>

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#define XCC xcc

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#define EX(x,y)			\

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98:	x,y;			\

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	.section __ex_table,"a";\

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	.align 4;		\

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	.word 98b, __retl_one;	\

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	.text;			\

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	.align 4;

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	.register	%g2,#scratch

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	.register	%g3,#scratch

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	.text

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	.align	32

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	/* Don't try to get too fancy here, just nice and

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	 * simple.  This is predominantly used for well aligned

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	 * small copies in the compat layer.  It is also used

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	 * to copy register windows around during thread cloning.

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	 */

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ENTRY(___copy_in_user)	/* %o0=dst, %o1=src, %o2=len */

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	cmp		%o2, 0

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	be,pn		%XCC, 85f

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	 or		%o0, %o1, %o3

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	cmp		%o2, 16

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	bleu,a,pn	%XCC, 80f

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	 or		%o3, %o2, %o3

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	/* 16 < len <= 64 */

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	andcc		%o3, 0x7, %g0

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	bne,pn		%XCC, 90f

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	 nop

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	andn		%o2, 0x7, %o4

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	and		%o2, 0x7, %o2

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1:	subcc		%o4, 0x8, %o4

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	EX(ldxa [%o1] %asi, %o5)

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	EX(stxa %o5, [%o0] %asi)

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	add		%o1, 0x8, %o1

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	bgu,pt		%XCC, 1b

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	 add		%o0, 0x8, %o0

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	andcc		%o2, 0x4, %g0

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	be,pt		%XCC, 1f

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	 nop

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	sub		%o2, 0x4, %o2

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	EX(lduwa [%o1] %asi, %o5)

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	EX(stwa %o5, [%o0] %asi)

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	add		%o1, 0x4, %o1

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	add		%o0, 0x4, %o0

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1:	cmp		%o2, 0

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	be,pt		%XCC, 85f

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	 nop

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	ba,pt		%xcc, 90f

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	 nop

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80:	/* 0 < len <= 16 */

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	andcc		%o3, 0x3, %g0

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	bne,pn		%XCC, 90f

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	 nop

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82:

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	subcc		%o2, 4, %o2

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	EX(lduwa [%o1] %asi, %g1)

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	EX(stwa %g1, [%o0] %asi)

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	add		%o1, 4, %o1

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	bgu,pt		%XCC, 82b

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	 add		%o0, 4, %o0

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85:	retl

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	 clr		%o0

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	.align	32

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90:

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	subcc		%o2, 1, %o2

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	EX(lduba [%o1] %asi, %g1)

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	EX(stba %g1, [%o0] %asi)

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	add		%o1, 1, %o1

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	bgu,pt		%XCC, 90b

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	 add		%o0, 1, %o0

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	retl

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	 clr		%o0

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ENDPROC(___copy_in_user)

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