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

• Lines: 78
• Date: Sat Feb 24 22:58:45 1996
• Orig file: v1.3.93/linux/arch/m68k/fpsp040/x_unimp.S
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.93/linux/arch/m68k/fpsp040/x_unimp.S linux/arch/m68k/fpsp040/x_unimp.S
@@ -0,0 +1,77 @@
+|
+|	x_unimp.sa 3.3 7/1/91
+|
+|	fpsp_unimp --- FPSP handler for unimplemented instruction	
+|	exception.
+|
+| Invoked when the user program encounters a floating-point
+| op-code that hardware does not support.  Trap vector# 11
+| (See table 8-1 MC68030 User's Manual).
+|
+| 
+| Note: An fsave for an unimplemented inst. will create a short
+| fsave stack.
+|
+|  Input: 1. Six word stack frame for unimplemented inst, four word
+|            for illegal
+|            (See table 8-7 MC68030 User's Manual).
+|         2. Unimp (short) fsave state frame created here by fsave
+|            instruction.
+|
+|
+|		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+|	THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA 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_UNIMP:	|idnt    2,1 | Motorola 040 Floating Point Software Package
+
+	|section	8
+
+	.include "fpsp.h"
+
+	|xref	get_op
+	|xref	do_func
+	|xref	sto_res
+	|xref	gen_except
+	|xref	fpsp_fmt_error
+
+	.global	fpsp_unimp
+	.global	uni_2
+fpsp_unimp:
+	link		%a6,#-LOCAL_SIZE
+	fsave		-(%a7)
+uni_2:
+	moveml		%d0-%d1/%a0-%a1,USER_DA(%a6)
+	fmovemx	%fp0-%fp3,USER_FP0(%a6)
+	fmoveml	%fpcr/%fpsr/%fpiar,USER_FPCR(%a6)
+	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
+|
+|	Temporary D25B Fix
+|	The following lines are used to ensure that the FPSR
+|	exception byte and condition codes are clear before proceeding
+|
+	movel		USER_FPSR(%a6),%d0
+	andl		#0xFF00FF,%d0	|clear all but accrued exceptions
+	movel		%d0,USER_FPSR(%a6)
+	fmovel		#0,%FPSR |clear all user bits
+	fmovel		#0,%FPCR	|clear all user exceptions for FPSP
+
+	clrb		UFLG_TMP(%a6)	|clr flag for unsupp data
+
+	bsrl		get_op		|go get operand(s)
+	clrb		STORE_FLG(%a6)
+	bsrl		do_func		|do the function
+	fsave		-(%a7)		|capture possible exc state
+	tstb		STORE_FLG(%a6)
+	bnes		no_store	|if STORE_FLG is set, no store
+	bsrl		sto_res		|store the result in user space
+no_store:
+	bral		gen_except	|post any exceptions and return
+
+	|end