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WebSVN – planix.SVN – Blame – /os/branches/feature-vt/sys/src/libc/mips/strcpy.s – Rev 2

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Rev Author Line No. Line
2 - 1 
TEXT	strcpy(SB), $0
2 
 
3 
	MOVW	s2+4(FP),R2		/* R2 is from pointer */
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	MOVW	R1, R3			/* R3 is to pointer */
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/*
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 * align 'from' pointer
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 */
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l1:
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	AND	$3, R2, R5
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	ADDU	$1, R2
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	BEQ	R5, l2
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	MOVB	-1(R2), R5
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	ADDU	$1, R3
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	MOVB	R5, -1(R3)
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	BNE	R5, l1
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	RET
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/*
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 * test if 'to' is also alligned
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 */
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l2:
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	AND	$3,R3, R5
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	BEQ	R5, l4
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/*
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 * copy 4 at a time, 'to' not aligned
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 */
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l3:
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	MOVW	-1(R2), R4
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	ADD	$4, R2
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	ADD	$4, R3
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	SRL	$24,R4, R5
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	MOVB	R5, -4(R3)
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	BEQ	R5, out
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	SRL	$16,R4, R5
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	AND	$0xff, R5
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	MOVB	R5, -3(R3)
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	BEQ	R5, out
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	SRL	$8,R4, R5
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	AND	$0xff, R5
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	MOVB	R5, -2(R3)
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	BEQ	R5, out
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	AND	$0xff,R4, R5
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	MOVB	R5, -1(R3)
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	BNE	R5, l3
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out:
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	RET
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/*
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 * word at a time both aligned
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 */
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l4:
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	MOVW	$0xff000000, R7
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	MOVW	$0x00ff0000, R8
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l5:
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	ADDU	$4, R3
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	MOVW	-1(R2), R4	/* fetch */
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	ADDU	$4, R2
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	AND	R7,R4, R5	/* is it byte 0 */
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	AND	R8,R4, R6	/* is it byte 1 */
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	BEQ	R5, b0
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	AND	$0xff00,R4, R5	/* is it byte 2 */
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	BEQ	R6, b1
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	AND	$0xff,R4, R6	/* is it byte 3 */
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	BEQ	R5, b2
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	MOVW	R4, -4(R3)	/* store */
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	BNE	R6, l5
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	JMP	out
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b0:
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	MOVB	$0, -4(R3)
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	JMP	out
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b1:
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	SRL	$24, R4
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	MOVB	R4, -4(R3)
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	MOVB	$0, -3(R3)
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	JMP	out
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b2:
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	SRL	$24,R4, R5
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	MOVB	R5, -4(R3)
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	SRL	$16, R4
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	MOVB	R4, -3(R3)
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	MOVB	$0, -2(R3)
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	JMP	out