1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
|
/*++
Copyright (c) 1992 Microsoft Corporation
Module Name:
reflect.c
Abstract:
This module contains extensions having to do with event and exception
reflection.
Author:
Dave Hastings (daveh) 20-Apr-1992
Revision History:
Neil Sandlin (NeilSa) 15-Jan-1996 Merged with vdmexts
--*/
#include <precomp.h>
#pragma hdrstop
VOID
er(
CMD_ARGLIST
)
/*++
Routine Description:
This routine toggles the exception reflection bit in the vdmtib, and
reports the current state
Arguments:
None.
Return Value:
None.
--*/
{
BOOL Status;
PVOID Address;
ULONG Flags;
CMD_INIT();
if ( fWinDbg ) {
(*Print)("This command is not supported under WinDbg\n");
} else {
Address = (PVOID) (FIXED_NTVDMSTATE_LINEAR + GetIntelBase());
//
// Read the current value of the flags
//
Status = READMEM(
Address,
&Flags,
sizeof(ULONG)
);
if (!Status) {
(ULONG)Address = (*GetExpression)("ntvdm!InitialVdmTibFlags");
Status = READMEM(
(PVOID)Address,
&Flags,
sizeof(ULONG)
);
if (!Status) {
GetLastError();
(*Print)("Could not get InitialTibflags\n");
return;
}
}
//
// Toggle exception bit
//
Flags ^= VDM_BREAK_EXCEPTIONS;
Status = WRITEMEM(
Address,
&Flags,
sizeof(ULONG)
);
if (!Status) {
GetLastError();
(*Print)("Could not get set Flags\n");
return;
}
//
// Tell user what will happen with exceptions
//
if (Flags & VDM_BREAK_EXCEPTIONS) {
(*Print)("GP Fault exceptions will be reflected to the debugger\n");
} else {
(*Print)("GP Fault exceptions will be reflected to the application\n");
}
}
}
VOID
dr(
CMD_ARGLIST
)
/*++
Routine Description:
This routine toggles the debug reflection bit in the vdmtib, and
reports the current state
Arguments:
None.
Return Value:
None.
--*/
{
BOOL Status;
PVOID Address;
ULONG Flags;
CMD_INIT();
if ( fWinDbg ) {
(*Print)("This command is not supported under WinDbg\n");
} else {
Address = (PVOID) (FIXED_NTVDMSTATE_LINEAR + GetIntelBase());
//
// Read the current value of the flags
//
Status = READMEM(
Address,
&Flags,
sizeof(ULONG)
);
if (!Status) {
(ULONG)Address = (*GetExpression)("ntvdm!InitialVdmTibFlags");
Status = READMEM(
(PVOID)Address,
&Flags,
sizeof(ULONG)
);
if (!Status) {
GetLastError();
(*Print)("Could not get InitialTibflags\n");
return;
}
}
//
// Toggle exception bit
//
Flags ^= VDM_BREAK_DEBUGGER;
Status = WRITEMEM(
Address,
&Flags,
sizeof(ULONG)
);
if (!Status) {
GetLastError();
(*Print)("Could not get set Flags\n");
return;
}
//
// Tell user what will happen with exceptions
//
if (!(Flags & VDM_BREAK_DEBUGGER)) {
(*Print)("Debug faults will be reflected to the application\n");
} else {
(*Print)("Debug faults will be reflected to the debugger\n");
}
}
}
|
