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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/sparc/lib/GENmemcpy.S
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/* GENmemcpy.S: Generic sparc64 memcpy.

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 *

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 * Copyright (C) 2007 David S. Miller ([email protected])

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 */

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#ifdef __KERNEL__

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#define GLOBAL_SPARE	%g7

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#else

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#define GLOBAL_SPARE	%g5

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#endif

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#ifndef EX_LD

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#define EX_LD(x)	x

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#endif

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#ifndef EX_ST

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#define EX_ST(x)	x

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#endif

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#ifndef EX_RETVAL

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#define EX_RETVAL(x)	x

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#endif

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#ifndef LOAD

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#define LOAD(type,addr,dest)	type [addr], dest

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#endif

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#ifndef STORE

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#define STORE(type,src,addr)	type src, [addr]

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#endif

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#ifndef FUNC_NAME

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#define FUNC_NAME	GENmemcpy

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#endif

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#ifndef PREAMBLE

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#define PREAMBLE

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#endif

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#ifndef XCC

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#define XCC xcc

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#endif

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	.register	%g2,#scratch

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	.register	%g3,#scratch

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	.text

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	.align		64

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	.globl	FUNC_NAME

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	.type	FUNC_NAME,#function

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FUNC_NAME:	/* %o0=dst, %o1=src, %o2=len */

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	srlx		%o2, 31, %g2

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	cmp		%g2, 0

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	tne		%XCC, 5

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	PREAMBLE

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	mov		%o0, GLOBAL_SPARE

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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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	blu,a,pn	%XCC, 80f

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	 or		%o3, %o2, %o3

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	xor		%o0, %o1, %o4

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	andcc		%o4, 0x7, %g0

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	bne,a,pn	%XCC, 90f

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	 sub		%o0, %o1, %o3

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	and		%o0, 0x7, %o4

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	sub		%o4, 0x8, %o4

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	sub		%g0, %o4, %o4

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	sub		%o2, %o4, %o2

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1:	subcc		%o4, 1, %o4

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	EX_LD(LOAD(ldub, %o1, %g1))

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	EX_ST(STORE(stb, %g1, %o0))

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	add		%o1, 1, %o1

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	bne,pt		%XCC, 1b

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	add		%o0, 1, %o0

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	andn		%o2, 0x7, %g1

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	sub		%o2, %g1, %o2

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1:	subcc		%g1, 0x8, %g1

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	EX_LD(LOAD(ldx, %o1, %g2))

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	EX_ST(STORE(stx, %g2, %o0))

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	add		%o1, 0x8, %o1

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	bne,pt		%XCC, 1b

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	 add		%o0, 0x8, %o0

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	brz,pt		%o2, 85f

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	 sub		%o0, %o1, %o3

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	ba,a,pt		%XCC, 90f

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	.align		64

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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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	 sub		%o0, %o1, %o3

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1:

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	subcc		%o2, 4, %o2

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	EX_LD(LOAD(lduw, %o1, %g1))

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	EX_ST(STORE(stw, %g1, %o1 + %o3))

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	bgu,pt		%XCC, 1b

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	 add		%o1, 4, %o1

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85:	retl

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	 mov		EX_RETVAL(GLOBAL_SPARE), %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_LD(LOAD(ldub, %o1, %g1))

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	EX_ST(STORE(stb, %g1, %o1 + %o3))

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	bgu,pt		%XCC, 90b

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	 add		%o1, 1, %o1

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	retl

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	 mov		EX_RETVAL(GLOBAL_SPARE), %o0

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	.size		FUNC_NAME, .-FUNC_NAME

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