blob: 5cfd3cf2c68f514f6a0e8c2048a96a86a3fd59f3 (
plain) (
blame)
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
|
/*++
Copyright (c) 1994 Microsoft Corporation
Module Name:
miscops.c
Abstract:
This module implements the code to emulate miscellaneous opcodes.
Author:
David N. Cutler (davec) 22-Sep-1994
Environment:
Kernel mode only.
Revision History:
--*/
#include "nthal.h"
#include "emulate.h"
VOID
XmBoundOp (
PRXM_CONTEXT P
)
/*++
Routine Description:
This function emulates a bound opcode.
Arguments:
P - Supplies a pointer to an emulator context structure.
Return Value:
None.
--*/
{
union {
LONG Long;
SHORT Word;
} LowerBound;
union {
LONG Long;
SHORT Word;
} UpperBound;
ULONG Offset;
//
// Get lower and upper bounds and check index against index value.
//
Offset = P->SrcValue.Long;
XmSetSourceValue(P, XmGetOffsetAddress(P, Offset));
LowerBound.Long = P->SrcValue.Long;
XmSetSourceValue(P, XmGetOffsetAddress(P, Offset + P->DataType + 1));
UpperBound.Long = P->SrcValue.Long;
if (P->DataType == LONG_DATA) {
if (((LONG)(*P->DstLong) < LowerBound.Long) ||
((LONG)(*P->DstLong) > (UpperBound.Long + (LONG)(P->DataType + 1)))) {
longjmp(&P->JumpBuffer[0], XM_INDEX_OUT_OF_BOUNDS);
}
} else {
if (((SHORT)(*P->DstWord) < LowerBound.Word) ||
((SHORT)(*P->DstWord) > (UpperBound.Word + (SHORT)(P->DataType + 1)))) {
longjmp(&P->JumpBuffer[0], XM_INDEX_OUT_OF_BOUNDS);
}
}
return;
}
VOID
XmBswapOp (
PRXM_CONTEXT P
)
/*++
Routine Description:
This function emulates a bswap opcode.
Arguments:
P - Supplies a pointer to an emulator context structure.
Return Value:
None.
--*/
{
ULONG Result;
//
// Swap bytes and set result value.
//
Result = (P->SrcValue.Long << 24) | ((P->SrcValue.Long & 0xff00) << 8) |
(P->SrcValue.Long >> 24) | ((P->SrcValue.Long >> 8) & 0xff00);
XmStoreResult(P, Result);
return;
}
VOID
XmIllOp (
PRXM_CONTEXT P
)
/*++
Routine Description:
This function emulates an illegal opcode.
Arguments:
P - Supplies a pointer to an emulator context structure.
Return Value:
None.
--*/
{
//
// Raise an illegal opcode exception.
//
longjmp(&P->JumpBuffer[0], XM_ILLEGAL_INSTRUCTION_OPCODE);
return;
}
VOID
XmNopOp (
PRXM_CONTEXT P
)
/*++
Routine Description:
This function emulates a nop opcode.
Arguments:
P - Supplies a pointer to an emulator context structure.
Return Value:
None.
--*/
{
return;
}
|
