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| x_unimp.sa 3.3 7/1/91
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| fpsp_unimp --- FPSP handler for unimplemented instruction
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| exception.
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| Invoked when the user program encounters a floating-point
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| op-code that hardware does not support. Trap vector# 11
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| (See table 8-1 MC68030 User's Manual).
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| Note: An fsave for an unimplemented inst. will create a short
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| fsave stack.
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| Input: 1. Six word stack frame for unimplemented inst, four word
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| for illegal
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| (See table 8-7 MC68030 User's Manual).
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| 2. Unimp (short) fsave state frame created here by fsave
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| instruction.
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| Copyright (C) Motorola, Inc. 1990
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| All Rights Reserved
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|
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| For details on the license for this file, please see the
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| file, README, in this same directory.
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|
X_UNIMP: |idnt 2,1 | Motorola 040 Floating Point Software Package
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|section 8
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#include "fpsp.h"
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|xref get_op
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|xref do_func
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|xref sto_res
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|xref gen_except
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|xref fpsp_fmt_error
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.global fpsp_unimp
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.global uni_2
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fpsp_unimp:
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link %a6,#-LOCAL_SIZE
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fsave -(%a7)
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uni_2:
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moveml %d0-%d1/%a0-%a1,USER_DA(%a6)
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fmovemx %fp0-%fp3,USER_FP0(%a6)
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fmoveml %fpcr/%fpsr/%fpiar,USER_FPCR(%a6)
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moveb (%a7),%d0 |test for valid version num
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andib #0xf0,%d0 |test for $4x
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cmpib #VER_4,%d0 |must be $4x or exit
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bnel fpsp_fmt_error
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| Temporary D25B Fix
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| The following lines are used to ensure that the FPSR
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| exception byte and condition codes are clear before proceeding
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movel USER_FPSR(%a6),%d0
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andl #0xFF00FF,%d0 |clear all but accrued exceptions
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movel %d0,USER_FPSR(%a6)
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fmovel #0,%FPSR |clear all user bits
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fmovel #0,%FPCR |clear all user exceptions for FPSP
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clrb UFLG_TMP(%a6) |clr flag for unsupp data
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bsrl get_op |go get operand(s)
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clrb STORE_FLG(%a6)
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bsrl do_func |do the function
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fsave -(%a7) |capture possible exc state
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tstb STORE_FLG(%a6)
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bnes no_store |if STORE_FLG is set, no store
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bsrl sto_res |store the result in user space
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no_store:
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bral gen_except |post any exceptions and return
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|end
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