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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/m68k/fpsp040/sto_res.S
10818 views
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|	sto_res.sa 3.1 12/10/90

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|

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|	Takes the result and puts it in where the user expects it.

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|	Library functions return result in fp0.	If fp0 is not the

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|	users destination register then fp0 is moved to the

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|	correct floating-point destination register.  fp0 and fp1

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|	are then restored to the original contents.

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|

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|	Input:	result in fp0,fp1

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|

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|		d2 & a0 should be kept unmodified

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|

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|	Output:	moves the result to the true destination reg or mem

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|

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|	Modifies: destination floating point register

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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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STO_RES:	|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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	.global	sto_cos

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sto_cos:

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	bfextu		CMDREG1B(%a6){#13:#3},%d0	|extract cos destination

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	cmpib		#3,%d0		|check for fp0/fp1 cases

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	bles		c_fp0123

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	fmovemx	%fp1-%fp1,-(%a7)

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	moveql		#7,%d1

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	subl		%d0,%d1		|d1 = 7- (dest. reg. no.)

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	clrl		%d0

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	bsetl		%d1,%d0		|d0 is dynamic register mask

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	fmovemx	(%a7)+,%d0

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	rts

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c_fp0123:

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	cmpib		#0,%d0

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	beqs		c_is_fp0

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	cmpib		#1,%d0

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	beqs		c_is_fp1

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	cmpib		#2,%d0

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	beqs		c_is_fp2

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c_is_fp3:

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	fmovemx	%fp1-%fp1,USER_FP3(%a6)

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	rts

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c_is_fp2:

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	fmovemx	%fp1-%fp1,USER_FP2(%a6)

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	rts

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c_is_fp1:

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	fmovemx	%fp1-%fp1,USER_FP1(%a6)

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	rts

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c_is_fp0:

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	fmovemx	%fp1-%fp1,USER_FP0(%a6)

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	rts

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	.global	sto_res

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sto_res:

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	bfextu		CMDREG1B(%a6){#6:#3},%d0	|extract destination register

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	cmpib		#3,%d0		|check for fp0/fp1 cases

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	bles		fp0123

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	fmovemx	%fp0-%fp0,-(%a7)

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	moveql		#7,%d1

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	subl		%d0,%d1		|d1 = 7- (dest. reg. no.)

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	clrl		%d0

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	bsetl		%d1,%d0		|d0 is dynamic register mask

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	fmovemx	(%a7)+,%d0

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	rts

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fp0123:

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	cmpib		#0,%d0

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	beqs		is_fp0

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	cmpib		#1,%d0

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	beqs		is_fp1

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	cmpib		#2,%d0

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	beqs		is_fp2

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is_fp3:

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	fmovemx	%fp0-%fp0,USER_FP3(%a6)

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	rts

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is_fp2:

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	fmovemx	%fp0-%fp0,USER_FP2(%a6)

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	rts

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is_fp1:

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	fmovemx	%fp0-%fp0,USER_FP1(%a6)

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	rts

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is_fp0:

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

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	rts

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	|end

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