xref: /netbsd/sys/arch/m68k/fpsp/x_unsupp.sa (revision 6550d01e)
1*	$NetBSD: x_unsupp.sa,v 1.2 1994/10/26 07:50:33 cgd Exp $
2
3*	MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP
4*	M68000 Hi-Performance Microprocessor Division
5*	M68040 Software Package
6*
7*	M68040 Software Package Copyright (c) 1993, 1994 Motorola Inc.
8*	All rights reserved.
9*
10*	THE SOFTWARE is provided on an "AS IS" basis and without warranty.
11*	To the maximum extent permitted by applicable law,
12*	MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED,
13*	INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
14*	PARTICULAR PURPOSE and any warranty against infringement with
15*	regard to the SOFTWARE (INCLUDING ANY MODIFIED VERSIONS THEREOF)
16*	and any accompanying written materials.
17*
18*	To the maximum extent permitted by applicable law,
19*	IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER
20*	(INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS
21*	PROFITS, BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR
22*	OTHER PECUNIARY LOSS) ARISING OF THE USE OR INABILITY TO USE THE
23*	SOFTWARE.  Motorola assumes no responsibility for the maintenance
24*	and support of the SOFTWARE.
25*
26*	You are hereby granted a copyright license to use, modify, and
27*	distribute the SOFTWARE so long as this entire notice is retained
28*	without alteration in any modified and/or redistributed versions,
29*	and that such modified versions are clearly identified as such.
30*	No licenses are granted by implication, estoppel or otherwise
31*	under any patents or trademarks of Motorola, Inc.
32
33*
34*	x_unsupp.sa 3.3 7/1/91
35*
36*	fpsp_unsupp --- FPSP handler for unsupported data type exception
37*
38* Trap vector #55	(See table 8-1 Mc68030 User's manual).
39* Invoked when the user program encounters a data format (packed) that
40* hardware does not support or a data type (denormalized numbers or un-
41* normalized numbers).
42* Normalizes denorms and unnorms, unpacks packed numbers then stores
43* them back into the machine to let the 040 finish the operation.
44*
45* Unsupp calls two routines:
46* 	1. get_op -  gets the operand(s)
47* 	2. res_func - restore the function back into the 040 or
48* 			if fmove.p fpm,<ea> then pack source (fpm)
49* 			and store in users memory <ea>.
50*
51*  Input: Long fsave stack frame
52*
53
54X_UNSUPP	IDNT    2,1 Motorola 040 Floating Point Software Package
55
56	section	8
57
58	include	fpsp.h
59
60	xref	get_op
61	xref	res_func
62	xref	gen_except
63	xref	fpsp_fmt_error
64
65	xdef	fpsp_unsupp
66fpsp_unsupp:
67*
68	link		a6,#-LOCAL_SIZE
69	fsave		-(a7)
70	movem.l		d0-d1/a0-a1,USER_DA(a6)
71	fmovem.x	fp0-fp3,USER_FP0(a6)
72	fmovem.l	fpcr/fpsr/fpiar,USER_FPCR(a6)
73
74
75	move.b		(a7),VER_TMP(a6) ;save version number
76	move.b		(a7),d0		;test for valid version num
77	andi.b		#$f0,d0		;test for $4x
78	cmpi.b		#VER_4,d0	;must be $4x or exit
79	bne.l		fpsp_fmt_error
80
81	fmove.l		#0,FPSR		;clear all user status bits
82	fmove.l		#0,FPCR		;clear all user control bits
83*
84*	The following lines are used to ensure that the FPSR
85*	exception byte and condition codes are clear before proceeding,
86*	except in the case of fmove, which leaves the cc's intact.
87*
88unsupp_con:
89	move.l		USER_FPSR(a6),d1
90	btst		#5,CMDREG1B(a6)	;looking for fmove out
91	bne		fmove_con
92	and.l		#$FF00FF,d1	;clear all but aexcs and qbyte
93	bra.b		end_fix
94fmove_con:
95	and.l		#$0FFF40FF,d1	;clear all but cc's, snan bit, aexcs, and qbyte
96end_fix:
97	move.l		d1,USER_FPSR(a6)
98
99	st		UFLG_TMP(a6)	;set flag for unsupp data
100
101	bsr.l		get_op		;everything okay, go get operand(s)
102	bsr.l		res_func	;fix up stack frame so can restore it
103	clr.l		-(a7)
104	move.b		VER_TMP(a6),(a7) ;move idle fmt word to top of stack
105	bra.l		gen_except
106*
107	end
108