vstatus.s

来自「操作系统SunOS 4.1.3版本的源码」· S 代码 · 共 49 行

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|        .asciz  "@(#)Vstatus.s 1.1 92/07/30 Copyr 1986 Sun Micro"
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        .text

|       Copyright (c) 1986 by Sun Microsystems, Inc.

#include "fpcrtdefs.h"

VECTORED(status)

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ENTER(_fpstatus_)
	movel	sp@(4),a0	| Get address of long argument.
	movel	a0@,d0		| Get long argument.
	jmp	Vstatus

ENTER(getquotient)		| Get remainder quotient.
	JBSR(Vstatus, a0)
	movel	d0,sp@-
	JBSR(Vstatus, a0)
	movel	sp@+,d0
	swap	d0
	andw	#0x7f,d0
	btst	#23,d0
	beqs	1f
	negw	d0
1:
	extl	d0		| Old quotient.
	rts

ENTER(setquotient)		| Set remainder quotient.
	tstl	d0
	bpls	1f
	negb	d0
	bset	#7,d0
	bras	2f
1:
	bclr	#7,d0
2:
	andl	#0xff,d0	| Clear other bits.
	swap	d0
	movel	d0,sp@-
	JBSR(Vstatus, a0)
	andl	#0xff00ffff,d0	| Clear quotient.
	orl	sp@+,d0		| Insert new quotient.
	JBSR(Vstatus, a0)
	rts