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

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|

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|	fpsp_unsupp --- FPSP handler for unsupported data type exception

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|

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| Trap vector #55	(See table 8-1 Mc68030 User's manual).

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| Invoked when the user program encounters a data format (packed) that

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| hardware does not support or a data type (denormalized numbers or un-

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| normalized numbers).

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| Normalizes denorms and unnorms, unpacks packed numbers then stores

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| them back into the machine to let the 040 finish the operation.

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|

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| Unsupp calls two routines:

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|	1. get_op -  gets the operand(s)

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|	2. res_func - restore the function back into the 040 or

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|			if fmove.p fpm,<ea> then pack source (fpm)

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|			and store in users memory <ea>.

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|

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|  Input: Long fsave stack frame

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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_UNSUPP:	|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	res_func

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	|xref	gen_except

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	|xref	fpsp_fmt_error

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	.global	fpsp_unsupp

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fpsp_unsupp:

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|

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	link		%a6,#-LOCAL_SIZE

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	fsave		-(%a7)

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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),VER_TMP(%a6) |save version number

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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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	fmovel		#0,%FPSR		|clear all user status bits

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	fmovel		#0,%FPCR		|clear all user control bits

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|

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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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|	except in the case of fmove, which leaves the cc's intact.

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|

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unsupp_con:

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	movel		USER_FPSR(%a6),%d1

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	btst		#5,CMDREG1B(%a6)	|looking for fmove out

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	bne		fmove_con

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	andl		#0xFF00FF,%d1	|clear all but aexcs and qbyte

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	bras		end_fix

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fmove_con:

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	andl		#0x0FFF40FF,%d1	|clear all but cc's, snan bit, aexcs, and qbyte

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end_fix:

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	movel		%d1,USER_FPSR(%a6)

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	st		UFLG_TMP(%a6)	|set flag for unsupp data

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	bsrl		get_op		|everything okay, go get operand(s)

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	bsrl		res_func	|fix up stack frame so can restore it

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	clrl		-(%a7)

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	moveb		VER_TMP(%a6),(%a7) |move idle fmt word to top of stack

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	bral		gen_except

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|

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	|end

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