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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/m68k/fpsp040/x_unimp.S
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|	x_unimp.sa 3.3 7/1/91

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|

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|	fpsp_unimp --- FPSP handler for unimplemented instruction

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|	exception.

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|

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| Invoked when the user program encounters a floating-point

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| op-code that hardware does not support.  Trap vector# 11

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| (See table 8-1 MC68030 User's Manual).

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|

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|

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| Note: An fsave for an unimplemented inst. will create a short

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| fsave stack.

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|

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|  Input: 1. Six word stack frame for unimplemented inst, four word

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|            for illegal

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|            (See table 8-7 MC68030 User's Manual).

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|         2. Unimp (short) fsave state frame created here by fsave

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|            instruction.

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|

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|

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|		Copyright (C) Motorola, Inc. 1990

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|			All Rights Reserved

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|

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|       For details on the license for this file, please see the

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|       file, README, in this same directory.

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X_UNIMP:	|idnt    2,1 | Motorola 040 Floating Point Software Package

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	|section	8

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#include "fpsp.h"

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	|xref	get_op

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	|xref	do_func

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	|xref	sto_res

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	|xref	gen_except

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	|xref	fpsp_fmt_error

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	.global	fpsp_unimp

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	.global	uni_2

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fpsp_unimp:

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	link		%a6,#-LOCAL_SIZE

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	fsave		-(%a7)

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uni_2:

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	moveml		%d0-%d1/%a0-%a1,USER_DA(%a6)

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	fmovemx	%fp0-%fp3,USER_FP0(%a6)

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	fmoveml	%fpcr/%fpsr/%fpiar,USER_FPCR(%a6)

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	moveb		(%a7),%d0		|test for valid version num

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	andib		#0xf0,%d0		|test for $4x

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	cmpib		#VER_4,%d0	|must be $4x or exit

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	bnel		fpsp_fmt_error

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|

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|	Temporary D25B Fix

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|	The following lines are used to ensure that the FPSR

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|	exception byte and condition codes are clear before proceeding

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|

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	movel		USER_FPSR(%a6),%d0

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	andl		#0xFF00FF,%d0	|clear all but accrued exceptions

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	movel		%d0,USER_FPSR(%a6)

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	fmovel		#0,%FPSR |clear all user bits

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	fmovel		#0,%FPCR	|clear all user exceptions for FPSP

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	clrb		UFLG_TMP(%a6)	|clr flag for unsupp data

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	bsrl		get_op		|go get operand(s)

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	clrb		STORE_FLG(%a6)

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	bsrl		do_func		|do the function

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	fsave		-(%a7)		|capture possible exc state

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	tstb		STORE_FLG(%a6)

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	bnes		no_store	|if STORE_FLG is set, no store

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	bsrl		sto_res		|store the result in user space

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no_store:

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	bral		gen_except	|post any exceptions and return

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	|end

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