1 | ; File name : DosCritical.asm
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2 | ; Project name : Assembly Library
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3 | ; Created date : 1.9.2010
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4 | ; Last update : 2.9.2010
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5 | ; Author : Tomi Tilli
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6 | ; Description : DOS Critical Error Handler (24h) replacements.
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7 |
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8 | ; DOS Critical Error Handler return values
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9 | struc CRITICAL_ERROR_ACTION
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10 | .ignoreErrorAndContinueProcessingRequest resb 1
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11 | .retryOperation resb 1
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12 | .terminateProgramAsThoughInt21hAH4ChCalled resb 1
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13 | .failSystemCallInProgress resb 1
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14 | endstruc
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15 |
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16 |
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17 | ; Section containing code
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18 | SECTION .text
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19 |
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20 | ;--------------------------------------------------------------------
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21 | ; DosCritical_InstallNewHandlerFromCSDX
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22 | ; Parameters:
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23 | ; CS:DX: New Critical Error Handler
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24 | ; Returns:
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25 | ; Nothing
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26 | ; Corrupts registers:
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27 | ; AX
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28 | ;--------------------------------------------------------------------
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29 | ALIGN JUMP_ALIGN
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30 | DosCritical_InstallNewHandlerFromCSDX:
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31 | push ds
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32 |
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33 | push cs
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34 | pop ds
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35 | mov ax, (SET_INTERRUPT_VECTOR<<8) | DOS_CRITICAL_ERROR_HANDLER_24h
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36 | int DOS_INTERRUPT_21h
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37 |
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38 | pop ds
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39 | ret
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40 |
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41 |
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42 | ;--------------------------------------------------------------------
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43 | ; DosCritical_RestoreDosHandler
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44 | ; Parameters:
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45 | ; Nothing
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46 | ; Returns:
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47 | ; Nothing
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48 | ; Corrupts registers:
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49 | ; Nothing
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50 | ;--------------------------------------------------------------------
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51 | ALIGN JUMP_ALIGN
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52 | DosCritical_RestoreDosHandler:
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53 | push ds
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54 | push dx
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55 | push ax
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56 |
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57 | lds dx, [cs:PSP.fpInt24hCriticalError]
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58 | mov ax, (SET_INTERRUPT_VECTOR<<8) | DOS_CRITICAL_ERROR_HANDLER_24h
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59 | int DOS_INTERRUPT_21h
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60 |
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61 | pop ax
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62 | pop dx
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63 | pop ds
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64 | ret
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65 |
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66 |
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67 | ;--------------------------------------------------------------------
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68 | ; DosCritical_HandlerToIgnoreAllErrors
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69 | ; Parameters:
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70 | ; Nothing
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71 | ; Returns:
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72 | ; AL: CRITICAL_ERROR_ACTION
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73 | ; Corrupts registers:
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74 | ; Nothing
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75 | ;--------------------------------------------------------------------
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76 | ALIGN JUMP_ALIGN
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77 | DosCritical_HandlerToIgnoreAllErrors:
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78 | mov al, CRITICAL_ERROR_ACTION.ignoreErrorAndContinueProcessingRequest
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79 | iret
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