This repository has been archived by the owner on Feb 8, 2018. It is now read-only.
/
BfdDisassembler.cs
211 lines (173 loc) · 4.93 KB
/
BfdDisassembler.cs
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
201
202
203
204
205
206
207
208
209
210
211
using System;
using System.IO;
using System.Text;
using System.Collections;
using System.Runtime.InteropServices;
using Mono.Debugger;
using Mono.Debugger.Backends;
namespace Mono.Debugger.Backends
{
internal class BfdDisassembler : Disassembler, IDisposable
{
IntPtr dis;
IntPtr info;
TargetMemoryAccess memory;
SymbolTableManager symtab_manager;
[DllImport("monodebuggerserver")]
extern static int bfd_glue_disassemble_insn (IntPtr dis, IntPtr info, long address);
[DllImport("monodebuggerserver")]
extern static void bfd_glue_setup_disassembler (IntPtr info, ReadMemoryHandler read_memory_cb, OutputHandler output_cb, PrintAddressHandler print_address_cb);
[DllImport("monodebuggerserver")]
extern static void bfd_glue_free_disassembler (IntPtr info);
ReadMemoryHandler read_handler;
OutputHandler output_handler;
PrintAddressHandler print_handler;
internal BfdDisassembler (SymbolTableManager symtab_manager,
TargetMemoryAccess memory, IntPtr dis, IntPtr info)
{
this.dis = dis;
this.info = info;
this.memory = memory;
this.symtab_manager = symtab_manager;
read_handler = new ReadMemoryHandler (read_memory_func);
output_handler = new OutputHandler (output_func);
print_handler = new PrintAddressHandler (print_address_func);
bfd_glue_setup_disassembler (info, read_handler, output_handler,
print_handler);
}
private delegate int ReadMemoryHandler (long address, IntPtr data, int size);
private delegate void OutputHandler (string output);
private delegate void PrintAddressHandler (long address);
int read_memory_func (long address, IntPtr data, int size)
{
try {
TargetAddress location = new TargetAddress (
memory.AddressDomain, address);
byte[] buffer = memory.ReadBuffer (location, size);
Marshal.Copy (buffer, 0, data, size);
} catch (Exception e) {
memory_exception = e;
return 1;
}
return 0;
}
StringBuilder sb;
Exception memory_exception;
Method current_method;
void output_func (string output)
{
if (sb != null)
sb.Append (output);
}
void output_func (long address)
{
output_func (String.Format ("0x{0:x}", address));
}
void print_address_func (long address)
{
TargetAddress maddress = new TargetAddress (
memory.AddressDomain, address);
if (current_method != null) {
try {
MethodSource method = current_method.GetTrampoline (
memory, maddress);
if (method != null) {
output_func (method.Name);
return;
}
} catch (TargetException) {
}
}
Symbol name = symtab_manager.SimpleLookup (maddress, false);
if (name == null)
output_func (address);
else
output_func (String.Format ("0x{0:x}:{1}", address, name.ToString ()));
}
public override int GetInstructionSize (TargetAddress location)
{
memory_exception = null;
try {
int count = bfd_glue_disassemble_insn (dis, info, location.Address);
if (memory_exception != null)
throw memory_exception;
return count;
} finally {
memory_exception = null;
}
}
public override AssemblerMethod DisassembleMethod (Method method)
{
lock (this) {
ArrayList list = new ArrayList ();
TargetAddress current = method.StartAddress;
while (current < method.EndAddress) {
AssemblerLine line = DisassembleInstruction (method, current);
if (line == null)
break;
current += line.InstructionSize;
list.Add (line);
}
AssemblerLine[] lines = new AssemblerLine [list.Count];
list.CopyTo (lines, 0);
return new AssemblerMethod (method, lines);
}
}
public override AssemblerLine DisassembleInstruction (Method method,
TargetAddress address)
{
lock (this) {
memory_exception = null;
sb = new StringBuilder ();
address = new TargetAddress (
memory.AddressDomain, address.Address);
string insn;
int insn_size;
try {
current_method = method;
insn_size = bfd_glue_disassemble_insn (dis, info, address.Address);
if (memory_exception != null)
return null;
insn = sb.ToString ();
} finally {
sb = null;
memory_exception = null;
current_method = null;
}
Symbol label = null;
label = symtab_manager.SimpleLookup (address, true);
string label_name = null;
if (label != null)
label_name = label.ToString ();
return new AssemblerLine (
label_name, address, (byte) insn_size, insn);
}
}
//
// IDisposable
//
private bool disposed = false;
protected virtual void Dispose (bool disposing)
{
// Check to see if Dispose has already been called.
if (!this.disposed) {
this.disposed = true;
// Release unmanaged resources
lock (this) {
bfd_glue_free_disassembler (info);
info = IntPtr.Zero;
}
}
}
public void Dispose ()
{
Dispose (true);
// Take yourself off the Finalization queue
GC.SuppressFinalize (this);
}
~BfdDisassembler ()
{
Dispose (false);
}
}
}