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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/h8300/lib/memcpy.S
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;;; memcpy.S

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#include <asm/linkage.h>

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#if defined(__H8300H__) 

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	.h8300h

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#endif

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#if defined(__H8300S__) 

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	.h8300s

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#endif

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	.text

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.global SYMBOL_NAME(memcpy)

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;;; void *memcpy(void *to, void *from, size_t n)

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SYMBOL_NAME_LABEL(memcpy)

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	mov.l	er2,er2

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	bne	1f

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	rts	

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1:	

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	;; address check

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	bld	#0,r0l

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	bxor	#0,r1l

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	bcs	4f

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	mov.l	er4,@-sp

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	mov.l	er0,@-sp

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	btst	#0,r0l

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	beq	1f

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	;; (aligned even) odd address

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	mov.b	@er1,r3l

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	mov.b	r3l,@er0

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	adds	#1,er1

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	adds	#1,er0

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	dec.l	#1,er2

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	beq	3f

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1:	

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	;; n < sizeof(unsigned long) check

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	sub.l	er4,er4

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	adds	#4,er4		; loop count check value

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	cmp.l	er4,er2

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	blo	2f

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	;; unsigned long copy

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1:	

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	mov.l	@er1,er3

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	mov.l	er3,@er0

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	adds	#4,er0

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	adds	#4,er1

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	subs	#4,er2

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	cmp.l	er4,er2

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	bcc	1b	

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	;; rest

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2:	

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	mov.l	er2,er2

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	beq	3f

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1:	

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	mov.b	@er1,r3l

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	mov.b	r3l,@er0

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	adds	#1,er1

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	adds	#1,er0

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	dec.l	#1,er2

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	bne	1b

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3:

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	mov.l	@sp+,er0

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	mov.l	@sp+,er4

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	rts

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	;; odd <- even / even <- odd

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4:	

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	mov.l	er4,er3

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	mov.l	er2,er4

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	mov.l	er5,er2

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	mov.l	er1,er5

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	mov.l	er6,er1

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	mov.l	er0,er6

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1:

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	eepmov.w

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	mov.w	r4,r4

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	bne	1b

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	dec.w	#1,e4

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	bpl	1b

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	mov.l	er1,er6

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	mov.l	er2,er5

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	mov.l	er3,er4

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	rts

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