patch-1.3.94 linux/arch/m68k/fpsp040/x_unsupp.S

• Lines: 84
• Date: Sat Feb 24 22:58:45 1996
• Orig file: v1.3.93/linux/arch/m68k/fpsp040/x_unsupp.S
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.93/linux/arch/m68k/fpsp040/x_unsupp.S linux/arch/m68k/fpsp040/x_unsupp.S
@@ -0,0 +1,83 @@
+|
+|	x_unsupp.sa 3.3 7/1/91
+|
+|	fpsp_unsupp --- FPSP handler for unsupported data type exception
+|
+| Trap vector #55	(See table 8-1 Mc68030 User's manual).	
+| Invoked when the user program encounters a data format (packed) that
+| hardware does not support or a data type (denormalized numbers or un-
+| normalized numbers).
+| Normalizes denorms and unnorms, unpacks packed numbers then stores 
+| them back into the machine to let the 040 finish the operation.  
+|
+| Unsupp calls two routines:
+| 	1. get_op -  gets the operand(s)
+| 	2. res_func - restore the function back into the 040 or
+| 			if fmove.p fpm,<ea> then pack source (fpm)
+| 			and store in users memory <ea>.
+|
+|  Input: Long fsave stack frame
+|
+|
+
+|		Copyright (C) Motorola, Inc. 1990
+|			All Rights Reserved
+|
+|	THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA 
+|	The copyright notice above does not evidence any  
+|	actual or intended publication of such source code.
+
+X_UNSUPP:	|idnt    2,1 | Motorola 040 Floating Point Software Package
+
+	|section	8
+
+	.include "fpsp.h"
+
+	|xref	get_op
+	|xref	res_func
+	|xref	gen_except
+	|xref	fpsp_fmt_error
+
+	.global	fpsp_unsupp
+fpsp_unsupp:
+|
+	link		%a6,#-LOCAL_SIZE
+	fsave		-(%a7)
+	moveml		%d0-%d1/%a0-%a1,USER_DA(%a6)
+	fmovemx	%fp0-%fp3,USER_FP0(%a6)
+	fmoveml	%fpcr/%fpsr/%fpiar,USER_FPCR(%a6)
+
+
+	moveb		(%a7),VER_TMP(%a6) |save version number
+	moveb		(%a7),%d0		|test for valid version num
+	andib		#0xf0,%d0		|test for $4x
+	cmpib		#VER_4,%d0	|must be $4x or exit
+	bnel		fpsp_fmt_error
+
+	fmovel		#0,%FPSR		|clear all user status bits
+	fmovel		#0,%FPCR		|clear all user control bits
+|
+|	The following lines are used to ensure that the FPSR
+|	exception byte and condition codes are clear before proceeding,
+|	except in the case of fmove, which leaves the cc's intact.
+|
+unsupp_con:
+	movel		USER_FPSR(%a6),%d1
+	btst		#5,CMDREG1B(%a6)	|looking for fmove out
+	bne		fmove_con
+	andl		#0xFF00FF,%d1	|clear all but aexcs and qbyte
+	bras		end_fix
+fmove_con:
+	andl		#0x0FFF40FF,%d1	|clear all but cc's, snan bit, aexcs, and qbyte
+end_fix:
+	movel		%d1,USER_FPSR(%a6)
+
+	st		UFLG_TMP(%a6)	|set flag for unsupp data
+
+	bsrl		get_op		|everything okay, go get operand(s)
+	bsrl		res_func	|fix up stack frame so can restore it
+	clrl		-(%a7)
+	moveb		VER_TMP(%a6),(%a7) |move idle fmt word to top of stack
+	bral		gen_except
+|
+	|end