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//
// $Id$
//
// 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// THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA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.defs"
|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
|
