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
|
/*
Copyright (C) 2006 - 2015 Evan Teran
evan.teran@gmail.com
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "Breakpoint.h"
#include "Configuration.h"
#include "IDebugger.h"
#include "IProcess.h"
#include "edb.h"
namespace DebuggerCorePlugin {
namespace {
const std::vector<quint8> BreakpointInstructionARM_LE = {0xf0, 0x01, 0xf0, 0xe7}; // udf #0x10
const std::vector<quint8> BreakpointInstructionThumb_LE = {0x01, 0xde}; // udf #1
// We have to sometimes use a 32-bit Thumb-2 breakpoint. For explanation how to
// correctly use it see GDB's thumb_get_next_pcs_raw function and comments
// around arm_linux_thumb2_le_breakpoint array.
const std::vector<quint8> BreakpointInstructionThumb2_LE = {0xf0, 0xf7, 0x00, 0xa0}; // udf.w #0
// This one generates SIGILL both in ARM32 and Thumb mode. In ARM23 mode it's decoded as UDF 0xDDE0, while
// in Thumb it's a sequence `1: UDF 0xF0; B 1b`, which does stop the process even if it lands in the
// middle (on the second half-word), although the signal still occurs at the first half-word.
const std::vector<quint8> BreakpointInstructionUniversalThumbARM_LE = {0xf0, 0xde, 0xfd, 0xe7};
const std::vector<quint8> BreakpointInstructionThumbBKPT_LE = {0x00, 0xbe}; // bkpt #0
const std::vector<quint8> BreakpointInstructionARM32BKPT_LE = {0x70, 0x00, 0x20, 0xe1}; // bkpt #0
}
//------------------------------------------------------------------------------
// Name: Breakpoint
// Desc: constructor
//------------------------------------------------------------------------------
Breakpoint::Breakpoint(edb::address_t address)
: address_(address), type_(edb::v1::config().default_breakpoint_type) {
if (!enable()) {
throw BreakpointCreationError();
}
}
auto Breakpoint::supportedTypes() -> std::vector<BreakpointType> {
std::vector<BreakpointType> types = {
BreakpointType{Type{TypeId::Automatic}, QObject::tr("Automatic")},
BreakpointType{Type{TypeId::ARM32}, QObject::tr("Always ARM32 UDF")},
BreakpointType{Type{TypeId::Thumb2Byte}, QObject::tr("Always Thumb UDF")},
BreakpointType{Type{TypeId::Thumb4Byte}, QObject::tr("Always Thumb2 UDF.W")},
BreakpointType{Type{TypeId::UniversalThumbARM32}, QObject::tr("Universal ARM/Thumb UDF(+B .-2)")},
BreakpointType{Type{TypeId::ARM32BKPT}, QObject::tr("ARM32 BKPT (may be slow)")},
BreakpointType{Type{TypeId::ThumbBKPT}, QObject::tr("Thumb BKPT (may be slow)")},
};
return types;
}
void Breakpoint::setType(TypeId type) {
disable();
type_ = type;
if (!enable()) {
throw BreakpointCreationError();
}
}
void Breakpoint::setType(IBreakpoint::TypeId type) {
disable();
if (Type{type} >= TypeId::TYPE_COUNT)
throw BreakpointCreationError();
setType(type);
}
//------------------------------------------------------------------------------
// Name: ~Breakpoint
// Desc:
//------------------------------------------------------------------------------
Breakpoint::~Breakpoint() {
disable();
}
//------------------------------------------------------------------------------
// Name: enable
// Desc:
//------------------------------------------------------------------------------
bool Breakpoint::enable() {
if (!enabled()) {
if (IProcess *process = edb::v1::debugger_core->process()) {
std::vector<quint8> prev(4);
prev.resize(process->readBytes(address(), &prev[0], prev.size()));
if (prev.size()) {
originalBytes_ = prev;
const std::vector<quint8> *bpBytes = nullptr;
switch (TypeId{type_}) {
case TypeId::Automatic:
if (edb::v1::debugger_core->cpuMode() == IDebugger::CpuMode::Thumb) {
bpBytes = &BreakpointInstructionThumb_LE;
} else {
bpBytes = &BreakpointInstructionARM_LE;
}
break;
case TypeId::ARM32:
bpBytes = &BreakpointInstructionARM_LE;
break;
case TypeId::Thumb2Byte:
bpBytes = &BreakpointInstructionThumb_LE;
break;
case TypeId::Thumb4Byte:
bpBytes = &BreakpointInstructionThumb2_LE;
break;
case TypeId::UniversalThumbARM32:
bpBytes = &BreakpointInstructionUniversalThumbARM_LE;
break;
case TypeId::ARM32BKPT:
bpBytes = &BreakpointInstructionARM32BKPT_LE;
break;
case TypeId::ThumbBKPT:
bpBytes = &BreakpointInstructionThumbBKPT_LE;
break;
}
assert(bpBytes);
assert(originalBytes_.size() >= bpBytes->size());
originalBytes_.resize(bpBytes->size());
// FIXME: we don't check whether this breakpoint will overlap any of the existing breakpoints
if (process->writeBytes(address(), bpBytes->data(), bpBytes->size())) {
enabled_ = true;
return true;
}
}
}
}
return false;
}
//------------------------------------------------------------------------------
// Name: disable
// Desc:
//------------------------------------------------------------------------------
bool Breakpoint::disable() {
if (enabled()) {
if (IProcess *process = edb::v1::debugger_core->process()) {
if (process->writeBytes(address(), &originalBytes_[0], originalBytes_.size())) {
enabled_ = false;
return true;
}
}
}
return false;
}
//------------------------------------------------------------------------------
// Name: hit
// Desc:
//------------------------------------------------------------------------------
void Breakpoint::hit() {
++hitCount_;
}
//------------------------------------------------------------------------------
// Name: setOneTime
// Desc:
//------------------------------------------------------------------------------
void Breakpoint::setOneTime(bool value) {
oneTime_ = value;
}
//------------------------------------------------------------------------------
// Name: setInternal
// Desc:
//------------------------------------------------------------------------------
void Breakpoint::setInternal(bool value) {
internal_ = value;
}
std::vector<size_t> Breakpoint::possibleRewindSizes() {
return {0}; // Even BKPT stops before the instruction, let alone UDF
}
}
|
