| [41] | 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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