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