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