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
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
|
//===-- UnwindMacOSXFrameBackchain.cpp --------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "lldb/Symbol/Function.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Symbol/Symbol.h"
#include "lldb/Target/ExecutionContext.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/Thread.h"
#include "lldb/Utility/ArchSpec.h"
#include "RegisterContextMacOSXFrameBackchain.h"
using namespace lldb;
using namespace lldb_private;
UnwindMacOSXFrameBackchain::UnwindMacOSXFrameBackchain(Thread &thread)
: Unwind(thread), m_cursors() {}
uint32_t UnwindMacOSXFrameBackchain::DoGetFrameCount() {
if (m_cursors.empty()) {
ExecutionContext exe_ctx(m_thread.shared_from_this());
Target *target = exe_ctx.GetTargetPtr();
if (target) {
const ArchSpec &target_arch = target->GetArchitecture();
// Frame zero should always be supplied by the thread...
exe_ctx.SetFrameSP(m_thread.GetStackFrameAtIndex(0));
if (target_arch.GetAddressByteSize() == 8)
GetStackFrameData_x86_64(exe_ctx);
else
GetStackFrameData_i386(exe_ctx);
}
}
return m_cursors.size();
}
bool UnwindMacOSXFrameBackchain::DoGetFrameInfoAtIndex(uint32_t idx,
addr_t &cfa,
addr_t &pc) {
const uint32_t frame_count = GetFrameCount();
if (idx < frame_count) {
if (m_cursors[idx].pc == LLDB_INVALID_ADDRESS)
return false;
if (m_cursors[idx].fp == LLDB_INVALID_ADDRESS)
return false;
pc = m_cursors[idx].pc;
cfa = m_cursors[idx].fp;
return true;
}
return false;
}
lldb::RegisterContextSP
UnwindMacOSXFrameBackchain::DoCreateRegisterContextForFrame(StackFrame *frame) {
lldb::RegisterContextSP reg_ctx_sp;
uint32_t concrete_idx = frame->GetConcreteFrameIndex();
const uint32_t frame_count = GetFrameCount();
if (concrete_idx < frame_count)
reg_ctx_sp.reset(new RegisterContextMacOSXFrameBackchain(
m_thread, concrete_idx, m_cursors[concrete_idx]));
return reg_ctx_sp;
}
size_t UnwindMacOSXFrameBackchain::GetStackFrameData_i386(
const ExecutionContext &exe_ctx) {
m_cursors.clear();
StackFrame *first_frame = exe_ctx.GetFramePtr();
Process *process = exe_ctx.GetProcessPtr();
if (process == NULL)
return 0;
struct Frame_i386 {
uint32_t fp;
uint32_t pc;
};
RegisterContext *reg_ctx = m_thread.GetRegisterContext().get();
assert(reg_ctx);
Cursor cursor;
cursor.pc = reg_ctx->GetPC(LLDB_INVALID_ADDRESS);
cursor.fp = reg_ctx->GetFP(0);
Frame_i386 frame = {static_cast<uint32_t>(cursor.fp),
static_cast<uint32_t>(cursor.pc)};
m_cursors.push_back(cursor);
const size_t k_frame_size = sizeof(frame);
Status error;
while (frame.fp != 0 && frame.pc != 0 && ((frame.fp & 7) == 0)) {
// Read both the FP and PC (8 bytes)
if (process->ReadMemory(frame.fp, &frame.fp, k_frame_size, error) !=
k_frame_size)
break;
if (frame.pc >= 0x1000) {
cursor.pc = frame.pc;
cursor.fp = frame.fp;
m_cursors.push_back(cursor);
}
}
if (!m_cursors.empty()) {
lldb::addr_t first_frame_pc = m_cursors.front().pc;
if (first_frame_pc != LLDB_INVALID_ADDRESS) {
const uint32_t resolve_scope =
eSymbolContextModule | eSymbolContextCompUnit |
eSymbolContextFunction | eSymbolContextSymbol;
SymbolContext first_frame_sc(
first_frame->GetSymbolContext(resolve_scope));
const AddressRange *addr_range_ptr = NULL;
AddressRange range;
if (first_frame_sc.function)
addr_range_ptr = &first_frame_sc.function->GetAddressRange();
else if (first_frame_sc.symbol) {
range.GetBaseAddress() = first_frame_sc.symbol->GetAddress();
range.SetByteSize(first_frame_sc.symbol->GetByteSize());
addr_range_ptr = ⦥
}
if (addr_range_ptr) {
if (first_frame->GetFrameCodeAddress() ==
addr_range_ptr->GetBaseAddress()) {
// We are at the first instruction, so we can recover the
// previous PC by dereferencing the SP
lldb::addr_t first_frame_sp = reg_ctx->GetSP(0);
// Read the real second frame return address into frame.pc
if (first_frame_sp &&
process->ReadMemory(first_frame_sp, &frame.pc, sizeof(frame.pc),
error) == sizeof(frame.pc)) {
cursor.fp = m_cursors.front().fp;
cursor.pc = frame.pc; // Set the new second frame PC
// Insert the second frame
m_cursors.insert(m_cursors.begin() + 1, cursor);
m_cursors.front().fp = first_frame_sp;
}
}
}
}
}
// uint32_t i=0;
// printf(" PC FP\n");
// printf(" ------------------ ------------------ \n");
// for (i=0; i<m_cursors.size(); ++i)
// {
// printf("[%3u] 0x%16.16" PRIx64 " 0x%16.16" PRIx64 "\n", i,
// m_cursors[i].pc, m_cursors[i].fp);
// }
return m_cursors.size();
}
size_t UnwindMacOSXFrameBackchain::GetStackFrameData_x86_64(
const ExecutionContext &exe_ctx) {
m_cursors.clear();
Process *process = exe_ctx.GetProcessPtr();
if (process == NULL)
return 0;
StackFrame *first_frame = exe_ctx.GetFramePtr();
struct Frame_x86_64 {
uint64_t fp;
uint64_t pc;
};
RegisterContext *reg_ctx = m_thread.GetRegisterContext().get();
assert(reg_ctx);
Cursor cursor;
cursor.pc = reg_ctx->GetPC(LLDB_INVALID_ADDRESS);
cursor.fp = reg_ctx->GetFP(0);
Frame_x86_64 frame = {cursor.fp, cursor.pc};
m_cursors.push_back(cursor);
Status error;
const size_t k_frame_size = sizeof(frame);
while (frame.fp != 0 && frame.pc != 0 && ((frame.fp & 7) == 0)) {
// Read both the FP and PC (16 bytes)
if (process->ReadMemory(frame.fp, &frame.fp, k_frame_size, error) !=
k_frame_size)
break;
if (frame.pc >= 0x1000) {
cursor.pc = frame.pc;
cursor.fp = frame.fp;
m_cursors.push_back(cursor);
}
}
if (!m_cursors.empty()) {
lldb::addr_t first_frame_pc = m_cursors.front().pc;
if (first_frame_pc != LLDB_INVALID_ADDRESS) {
const uint32_t resolve_scope =
eSymbolContextModule | eSymbolContextCompUnit |
eSymbolContextFunction | eSymbolContextSymbol;
SymbolContext first_frame_sc(
first_frame->GetSymbolContext(resolve_scope));
const AddressRange *addr_range_ptr = NULL;
AddressRange range;
if (first_frame_sc.function)
addr_range_ptr = &first_frame_sc.function->GetAddressRange();
else if (first_frame_sc.symbol) {
range.GetBaseAddress() = first_frame_sc.symbol->GetAddress();
range.SetByteSize(first_frame_sc.symbol->GetByteSize());
addr_range_ptr = ⦥
}
if (addr_range_ptr) {
if (first_frame->GetFrameCodeAddress() ==
addr_range_ptr->GetBaseAddress()) {
// We are at the first instruction, so we can recover the
// previous PC by dereferencing the SP
lldb::addr_t first_frame_sp = reg_ctx->GetSP(0);
// Read the real second frame return address into frame.pc
if (process->ReadMemory(first_frame_sp, &frame.pc, sizeof(frame.pc),
error) == sizeof(frame.pc)) {
cursor.fp = m_cursors.front().fp;
cursor.pc = frame.pc; // Set the new second frame PC
// Insert the second frame
m_cursors.insert(m_cursors.begin() + 1, cursor);
m_cursors.front().fp = first_frame_sp;
}
}
}
}
}
return m_cursors.size();
}
|
