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
|
/*
Copyright (C) 2012 Jeroen Frijters
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
Jeroen Frijters
jeroen@frijters.net
*/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using IKVM.Reflection;
namespace Ildasm
{
partial class Disassembler
{
struct ExportDirectoryTable
{
internal uint Flags;
internal uint DateTimeStamp;
internal ushort MajorVersion;
internal ushort MinorVersion;
internal uint NameRVA;
internal uint OrdinalBase;
internal uint AddressTableEntries;
internal uint NumberOfNamePointers;
internal uint ExportAddressTableRVA;
internal uint NamePointerRVA;
internal uint OrdinalTableRVA;
internal void Read(BinaryReader br)
{
Flags = br.ReadUInt32();
DateTimeStamp = br.ReadUInt32();
MajorVersion = br.ReadUInt16();
MinorVersion = br.ReadUInt16();
NameRVA = br.ReadUInt32();
OrdinalBase = br.ReadUInt32();
AddressTableEntries = br.ReadUInt32();
NumberOfNamePointers = br.ReadUInt32();
ExportAddressTableRVA = br.ReadUInt32();
NamePointerRVA = br.ReadUInt32();
OrdinalTableRVA = br.ReadUInt32();
}
}
struct ExportedMethod
{
internal int ordinal;
internal string name;
}
static Dictionary<int, List<ExportedMethod>> GetExportedMethods(Module module)
{
int rva;
int length;
module.__GetDataDirectoryEntry(0, out rva, out length);
if (rva == 0 || length < 40)
{
return new Dictionary<int, List<ExportedMethod>>();
}
ExportDirectoryTable edt = new ExportDirectoryTable();
byte[] buf = new byte[512];
module.__ReadDataFromRVA(rva, buf, 0, 40);
edt.Read(new BinaryReader(new MemoryStream(buf)));
var methods = new Dictionary<int, List<ExportedMethod>>();
for (int i = 0; i < edt.NumberOfNamePointers; i++)
{
module.__ReadDataFromRVA((int)edt.OrdinalTableRVA + i * 2, buf, 0, 2);
int ordinal = BitConverter.ToInt16(buf, 0) + (int)edt.OrdinalBase;
string name = null;
if (edt.NamePointerRVA != 0)
{
module.__ReadDataFromRVA((int)edt.NamePointerRVA + i * 4, buf, 0, 4);
module.__ReadDataFromRVA(BitConverter.ToInt32(buf, 0), buf, 0, buf.Length);
int len = 0;
while (buf[len] != 0) len++;
name = Encoding.ASCII.GetString(buf, 0, len);
}
int token = GetTokenFromExportOrdinal(module, edt, ordinal);
if (token == -1)
{
continue;
}
List<ExportedMethod> list;
if (!methods.TryGetValue(token, out list))
{
list = new List<ExportedMethod>();
methods.Add(token, list);
}
ExportedMethod method;
method.name = name;
method.ordinal = ordinal;
list.Add(method);
}
return methods;
}
static int GetTokenFromExportOrdinal(Module module, ExportDirectoryTable edt, int ordinal)
{
PortableExecutableKinds peKind;
ImageFileMachine machine;
module.GetPEKind(out peKind, out machine);
byte[] buf = new byte[16];
module.__ReadDataFromRVA((int)edt.ExportAddressTableRVA + (int)(ordinal - edt.OrdinalBase) * 4, buf, 0, 4);
int exportRVA = BitConverter.ToInt32(buf, 0);
if (machine == ImageFileMachine.ARM)
{
// mask out the instruction set selection flag
exportRVA &= ~1;
}
module.__ReadDataFromRVA(exportRVA, buf, 0, 16);
int offset;
if (machine == ImageFileMachine.I386 && buf[0] == 0xFF && buf[1] == 0x25)
{
// for x86 the code here is:
// FF 25 00 40 40 00 jmp dword ptr ds:[00404000h]
offset = 2;
}
else if (machine == ImageFileMachine.AMD64 && buf[0] == 0x48 && buf[1] == 0xA1)
{
// for x64 the code here is:
// 48 A1 00 40 40 00 00 00 00 00 mov rax,qword ptr [0000000000404000h]
// FF E0 jmp rax
offset = 2;
}
else if (machine == ImageFileMachine.ARM && buf[0] == 0xDF && buf[1] == 0xF8 && buf[2] == 0x08 && buf[3] == 0xC0)
{
// for arm the code here is:
// F8DF C008 ldr r12,0040145C
// F8DC C000 ldr r12,[r12]
// 4760 bx r12
// DEFE __debugbreak
// here is the RVA
offset = 12;
}
else
{
return -1;
}
int vtableRVA = BitConverter.ToInt32(buf, offset) - (int)module.__ImageBase;
module.__ReadDataFromRVA(vtableRVA, buf, 0, 4);
return BitConverter.ToInt32(buf, 0);
}
}
}
|
