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82 lines
2.2 KiB
82 lines
2.2 KiB
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| x_unsupp.sa 3.3 7/1/91 |
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| fpsp_unsupp --- FPSP handler for unsupported data type exception |
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| Trap vector #55 (See table 8-1 Mc68030 User's manual). |
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| Invoked when the user program encounters a data format (packed) that |
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| hardware does not support or a data type (denormalized numbers or un- |
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| normalized numbers). |
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| Normalizes denorms and unnorms, unpacks packed numbers then stores |
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| them back into the machine to let the 040 finish the operation. |
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| Unsupp calls two routines: |
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| 1. get_op - gets the operand(s) |
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| 2. res_func - restore the function back into the 040 or |
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| if fmove.p fpm,<ea> then pack source (fpm) |
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| and store in users memory <ea>. |
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| Input: Long fsave stack frame |
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| Copyright (C) Motorola, Inc. 1990 |
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| All Rights Reserved |
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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_UNSUPP: |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 res_func |
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|xref gen_except |
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|xref fpsp_fmt_error |
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.global fpsp_unsupp |
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fpsp_unsupp: |
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link %a6,#-LOCAL_SIZE |
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fsave -(%a7) |
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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),VER_TMP(%a6) |save version number |
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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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fmovel #0,%FPSR |clear all user status bits |
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fmovel #0,%FPCR |clear all user control bits |
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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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| except in the case of fmove, which leaves the cc's intact. |
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unsupp_con: |
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movel USER_FPSR(%a6),%d1 |
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btst #5,CMDREG1B(%a6) |looking for fmove out |
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bne fmove_con |
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andl #0xFF00FF,%d1 |clear all but aexcs and qbyte |
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bras end_fix |
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fmove_con: |
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andl #0x0FFF40FF,%d1 |clear all but cc's, snan bit, aexcs, and qbyte |
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end_fix: |
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movel %d1,USER_FPSR(%a6) |
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st UFLG_TMP(%a6) |set flag for unsupp data |
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bsrl get_op |everything okay, go get operand(s) |
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bsrl res_func |fix up stack frame so can restore it |
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clrl -(%a7) |
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moveb VER_TMP(%a6),(%a7) |move idle fmt word to top of stack |
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bral gen_except |
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|end
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