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/*
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 *	R4000 user level lock code
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 */
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#define	LL(base, rt)	WORD	$((060<<26)|((base)<<21)|((rt)<<16))
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#define	SC(base, rt)	WORD	$((070<<26)|((base)<<21)|((rt)<<16))
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#define	NOOP		WORD	$0x27
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#ifdef oldstyle
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TEXT	xadd(SB), $0
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	MOVW	R1, R2		/* address of counter */
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loop:	MOVW	n+4(FP), R3	/* increment */
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	LL(2, 1)
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	NOOP
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	ADD	R1,R3,R3
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	SC(2, 3)
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	NOOP
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	BEQ	R3,loop
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	RET
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#endif
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TEXT	_xinc(SB), $0
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	MOVW	R1, R2		/* address of counter */
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loop:	MOVW	$1, R3
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	LL(2, 1)
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	NOOP
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	ADD	R1,R3,R3
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	SC(2, 3)
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	NOOP
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	BEQ	R3,loop
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	RET
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TEXT	_xdec(SB), $0
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	MOVW	R1, R2		/* address of counter */
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loop1:	MOVW	$-1, R3
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	LL(2, 1)
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	NOOP
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	ADD	R1,R3,R3
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	MOVW	R3, R1
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	SC(2, 3)
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	NOOP
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	BEQ	R3,loop1
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	RET