xref: /src/sys/arch/m68k/fpsp/x_unimp.sa

*	MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP
*	M68000 Hi-Performance Microprocessor Division
*	M68040 Software Package 
*
*	M68040 Software Package Copyright (c) 1993, 1994 Motorola Inc.
*	All rights reserved.
*
*	THE SOFTWARE is provided on an "AS IS" basis and without warranty.
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*	MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED,
*	INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
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*	regard to the SOFTWARE (INCLUDING ANY MODIFIED VERSIONS THEREOF)
*	and any accompanying written materials. 
*
*	To the maximum extent permitted by applicable law,
*	IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER
*	(INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS
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*	OTHER PECUNIARY LOSS) ARISING OF THE USE OR INABILITY TO USE THE
*	SOFTWARE.  Motorola assumes no responsibility for the maintenance
*	and support of the SOFTWARE.  
*
*	You are hereby granted a copyright license to use, modify, and
*	distribute the SOFTWARE so long as this entire notice is retained
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*
*	x_unimp.sa 3.3 7/1/91
*
*	fpsp_unimp --- FPSP handler for unimplemented instruction	
*	exception.
*
* Invoked when the user program encounters a floating-point
* op-code that hardware does not support.  Trap vector# 11
* (See table 8-1 MC68030 User's Manual).
*
* 
* Note: An fsave for an unimplemented inst. will create a short
* fsave stack.
*
*  Input: 1. Six word stack frame for unimplemented inst, four word
*            for illegal
*            (See table 8-7 MC68030 User's Manual).
*         2. Unimp (short) fsave state frame created here by fsave
*            instruction.
*

X_UNIMP	IDNT    2,1 Motorola 040 Floating Point Software Package

	section	8

	include fpsp.h

	xref	get_op
	xref	do_func
	xref	sto_res
	xref	gen_except
	xref	fpsp_fmt_error

	xdef	fpsp_unimp
	xdef	uni_2
fpsp_unimp:
	link		a6,#-LOCAL_SIZE
	fsave		-(a7)
uni_2:
	movem.l		d0-d1/a0-a1,USER_DA(a6)
	fmovem.x	fp0-fp3,USER_FP0(a6)
	fmovem.l	fpcr/fpsr/fpiar,USER_FPCR(a6)
	move.b		(a7),d0		;test for valid version num
	andi.b		#$f0,d0		;test for $4x
	cmpi.b		#VER_4,d0	;must be $4x or exit
	bne.l		fpsp_fmt_error
*
*	Temporary D25B Fix
*	The following lines are used to ensure that the FPSR
*	exception byte and condition codes are clear before proceeding
*
	move.l		USER_FPSR(a6),d0
	and.l		#$FF00FF,d0	;clear all but accrued exceptions
	move.l		d0,USER_FPSR(a6)
	fmove.l		#0,FPSR ;clear all user bits
	fmove.l		#0,FPCR	;clear all user exceptions for FPSP

	clr.b		UFLG_TMP(a6)	;clr flag for unsupp data

	bsr.l		get_op		;go get operand(s)
	clr.b		STORE_FLG(a6)
	bsr.l		do_func		;do the function
	fsave		-(a7)		;capture possible exc state
	tst.b		STORE_FLG(a6)
	bne.b		no_store	;if STORE_FLG is set, no store
	bsr.l		sto_res		;store the result in user space
no_store:
	bra.l		gen_except	;post any exceptions and return

	end