#define	CLREX		WORD	$0xf57ff01f#define	LDREX(a,r)	WORD	$(0xe<<28|0x01900f9f | (a)<<16 | (r)<<12)/* `The order of operands is from left to right in dataflow order' - asm man */#define	STREX(v,a,r)	WORD	$(0xe<<28|0x01800f90 | (a)<<16 | (r)<<12 | (v)<<0) /* * int cas(ulong *p, ulong ov, ulong nv); */ TEXT	cas+0(SB),0,$0		/* r0 holds p */TEXT	casp+0(SB),0,$0		/* r0 holds p */	MOVW	ov+4(FP), R1	MOVW	nv+8(FP), R2spincas:	LDREX(0,3)	/*	LDREX	0(R0),R3	*/	CMP.S	R3, R1	BNE	fail	STREX(2,0,4)	/*	STREX	0(R0),R2,R4	*/	CMP.S	$0, R4	BNE	spincas	MOVW	$1, R0	RETfail:	CLREX	MOVW	$0, R0	RET TEXT _xinc(SB), $0	/* void	_xinc(long *); */TEXT ainc(SB), $0	/* long ainc(long *); */spinainc:	LDREX(0,3)	/*	LDREX	0(R0),R3	*/	ADD	$1,R3	STREX(3,0,4)	/*	STREX	0(R0),R3,R4	*/	CMP.S	$0, R4	BNE	spinainc	MOVW	R3, R0	RET TEXT _xdec(SB), $0	/* long _xdec(long *); */TEXT adec(SB), $0	/* long adec(long *); */spinadec:	LDREX(0,3)	/*	LDREX	0(R0),R3	*/	SUB	$1,R3	STREX(3,0,4)	/*	STREX	0(R0),R3,R4	*/	CMP.S	$0, R4	BNE	spinadec	MOVW	R3, R0	RET TEXT loadlinked(SB), $0	/* long loadlinked(long *); */	LDREX(0,0)	/*	LDREX	0(R0),R0	*/	RET TEXT storecond(SB), $0	/* int storecond(long *, long); */	MOVW	ov+4(FP), R3	STREX(3,0,0)	/*	STREX	0(R0),R3,R0	*/	RSB	$1, R0	RET