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703 | serge | 1 | ;***************************************************************************** |
2 | ;* |
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3 | ;* Open Watcom Project |
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4 | ;* |
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5 | ;* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved. |
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6 | ;* |
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7 | ;* ======================================================================== |
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8 | ;* |
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9 | ;* This file contains Original Code and/or Modifications of Original |
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10 | ;* Code as defined in and that are subject to the Sybase Open Watcom |
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11 | ;* Public License version 1.0 (the 'License'). You may not use this file |
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12 | ;* except in compliance with the License. BY USING THIS FILE YOU AGREE TO |
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13 | ;* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is |
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14 | ;* provided with the Original Code and Modifications, and is also |
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15 | ;* available at www.sybase.com/developer/opensource. |
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16 | ;* |
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17 | ;* The Original Code and all software distributed under the License are |
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18 | ;* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
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19 | ;* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM |
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20 | ;* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF |
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21 | ;* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR |
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22 | ;* NON-INFRINGEMENT. Please see the License for the specific language |
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23 | ;* governing rights and limitations under the License. |
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24 | ;* |
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25 | ;* ======================================================================== |
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26 | ;* |
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27 | ;* Description: Connect/disconnect 80x87 interrupt handler. |
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28 | ;* |
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29 | ;***************************************************************************** |
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30 | |||
31 | |||
32 | .8087 |
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33 | .386p |
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34 | |||
35 | include struct.inc |
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36 | include mdef.inc |
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37 | |||
38 | xref __FPE2Handler_ |
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39 | |||
40 | modstart fpe387 |
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41 | |||
42 | datasegment |
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43 | |||
44 | Save87 dd 0 |
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45 | enddata |
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46 | |||
47 | |||
48 | xdefp "C",__Init_FPE_handler |
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49 | defp __Init_FPE_handler |
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50 | _guess ; guess initialization required |
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51 | cmp dword ptr Save87,0 ; - quit if already initialized |
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52 | _quif ne ; - ... |
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53 | _admit ; admit: already initialized |
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54 | ret ; - return |
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55 | _endguess ; endguess |
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56 | push EAX ; save registers |
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57 | push EBX ; ... |
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58 | push ECX ; ... |
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59 | |||
60 | mov EAX, 68 |
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61 | mov EBX, 15 |
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62 | lea ECX, __FPE2Handler_ |
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63 | int 40h ; set new #FPE handler |
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64 | mov Save87, EAX ; save old handler |
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65 | |||
66 | pop ECX ; ... |
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67 | pop EBX ; ... |
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68 | pop EAX ; ... |
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69 | ret ; return |
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70 | endproc __Init_FPE_handler |
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71 | |||
72 | |||
73 | xdefp "C",__Fini_FPE_handler |
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74 | defp __Fini_FPE_handler |
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75 | cmp dword ptr Save87,0 ; if not initialized |
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76 | _if e ; - then |
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77 | ret ; - return |
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78 | _endif ; endif |
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79 | push EAX ; save registers |
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80 | push EBX ; ... |
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81 | push EDX ; ... |
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82 | sub ESP,4 ; allocate space for control word |
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83 | fstcw word ptr [ESP] ; get control word |
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84 | fwait ; ... |
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85 | mov byte ptr [ESP],7Fh ; disable exception interrupts |
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86 | fldcw word ptr [ESP] ; ... |
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87 | fwait ; ... |
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88 | add ESP,4 ; remove temporary |
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89 | |||
90 | mov EAX, 68 |
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91 | mov EBX, 15 |
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92 | mov ECX, dword ptr Save87 |
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93 | int 40h ; set new #FPE handler |
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94 | |||
95 | pop EDX ; ... |
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96 | pop EBX ; ... |
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97 | pop EAX ; ... |
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98 | ret |
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99 | endproc __Fini_FPE_handler |
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100 | |||
101 | endmod |
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102 | end |