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+|
+| 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
+|
+| For details on the license for this file, please see the
+| file, README, in this same directory.
+
+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