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
|
// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <map>
#include <optional>
#include "common/bit_field.h"
#include "common/common_types.h"
#include "common/logging/log.h"
#include "core/arm/arm_interface.h"
#include "core/core.h"
#include "core/loader/loader.h"
#include "core/memory.h"
namespace Core {
namespace {
constexpr u64 ELF_DYNAMIC_TAG_NULL = 0;
constexpr u64 ELF_DYNAMIC_TAG_STRTAB = 5;
constexpr u64 ELF_DYNAMIC_TAG_SYMTAB = 6;
constexpr u64 ELF_DYNAMIC_TAG_SYMENT = 11;
enum class ELFSymbolType : u8 {
None = 0,
Object = 1,
Function = 2,
Section = 3,
File = 4,
Common = 5,
TLS = 6,
};
enum class ELFSymbolBinding : u8 {
Local = 0,
Global = 1,
Weak = 2,
};
enum class ELFSymbolVisibility : u8 {
Default = 0,
Internal = 1,
Hidden = 2,
Protected = 3,
};
struct ELFSymbol {
u32 name_index;
union {
u8 info;
BitField<0, 4, ELFSymbolType> type;
BitField<4, 4, ELFSymbolBinding> binding;
};
ELFSymbolVisibility visibility;
u16 sh_index;
u64 value;
u64 size;
};
static_assert(sizeof(ELFSymbol) == 0x18, "ELFSymbol has incorrect size.");
using Symbols = std::vector<std::pair<ELFSymbol, std::string>>;
Symbols GetSymbols(VAddr text_offset) {
const auto mod_offset = text_offset + Memory::Read32(text_offset + 4);
if (mod_offset < text_offset || (mod_offset & 0b11) != 0 ||
Memory::Read32(mod_offset) != Common::MakeMagic('M', 'O', 'D', '0')) {
return {};
}
const auto dynamic_offset = Memory::Read32(mod_offset + 0x4) + mod_offset;
VAddr string_table_offset{};
VAddr symbol_table_offset{};
u64 symbol_entry_size{};
VAddr dynamic_index = dynamic_offset;
while (true) {
const auto tag = Memory::Read64(dynamic_index);
const auto value = Memory::Read64(dynamic_index + 0x8);
dynamic_index += 0x10;
if (tag == ELF_DYNAMIC_TAG_NULL) {
break;
}
if (tag == ELF_DYNAMIC_TAG_STRTAB) {
string_table_offset = value;
} else if (tag == ELF_DYNAMIC_TAG_SYMTAB) {
symbol_table_offset = value;
} else if (tag == ELF_DYNAMIC_TAG_SYMENT) {
symbol_entry_size = value;
}
}
if (string_table_offset == 0 || symbol_table_offset == 0 || symbol_entry_size == 0) {
return {};
}
const auto string_table_address = text_offset + string_table_offset;
const auto symbol_table_address = text_offset + symbol_table_offset;
Symbols out;
VAddr symbol_index = symbol_table_address;
while (symbol_index < string_table_address) {
ELFSymbol symbol{};
Memory::ReadBlock(symbol_index, &symbol, sizeof(ELFSymbol));
VAddr string_offset = string_table_address + symbol.name_index;
std::string name;
for (u8 c = Memory::Read8(string_offset); c != 0; c = Memory::Read8(++string_offset)) {
name += static_cast<char>(c);
}
symbol_index += symbol_entry_size;
out.push_back({symbol, name});
}
return out;
}
std::optional<std::string> GetSymbolName(const Symbols& symbols, VAddr func_address) {
const auto iter =
std::find_if(symbols.begin(), symbols.end(), [func_address](const auto& pair) {
const auto& [symbol, name] = pair;
const auto end_address = symbol.value + symbol.size;
return func_address >= symbol.value && func_address < end_address;
});
if (iter == symbols.end()) {
return std::nullopt;
}
return iter->second;
}
} // Anonymous namespace
constexpr u64 SEGMENT_BASE = 0x7100000000ull;
std::vector<ARM_Interface::BacktraceEntry> ARM_Interface::GetBacktrace() const {
std::vector<BacktraceEntry> out;
auto fp = GetReg(29);
auto lr = GetReg(30);
while (true) {
out.push_back({"", 0, lr, 0});
if (!fp) {
break;
}
lr = Memory::Read64(fp + 8) - 4;
fp = Memory::Read64(fp);
}
std::map<VAddr, std::string> modules;
auto& loader{system.GetAppLoader()};
if (loader.ReadNSOModules(modules) != Loader::ResultStatus::Success) {
return {};
}
std::map<std::string, Symbols> symbols;
for (const auto& module : modules) {
symbols.insert_or_assign(module.second, GetSymbols(module.first));
}
for (auto& entry : out) {
VAddr base = 0;
for (auto iter = modules.rbegin(); iter != modules.rend(); ++iter) {
const auto& module{*iter};
if (entry.original_address >= module.first) {
entry.module = module.second;
base = module.first;
break;
}
}
entry.offset = entry.original_address - base;
entry.address = SEGMENT_BASE + entry.offset;
if (entry.module.empty())
entry.module = "unknown";
const auto symbol_set = symbols.find(entry.module);
if (symbol_set != symbols.end()) {
const auto symbol = GetSymbolName(symbol_set->second, entry.offset);
if (symbol.has_value()) {
// TODO(DarkLordZach): Add demangling of symbol names.
entry.name = *symbol;
}
}
}
return out;
}
void ARM_Interface::LogBacktrace() const {
const VAddr sp = GetReg(13);
const VAddr pc = GetPC();
LOG_ERROR(Core_ARM, "Backtrace, sp={:016X}, pc={:016X}", sp, pc);
LOG_ERROR(Core_ARM, "{:20}{:20}{:20}{:20}{}", "Module Name", "Address", "Original Address",
"Offset", "Symbol");
LOG_ERROR(Core_ARM, "");
const auto backtrace = GetBacktrace();
for (const auto& entry : backtrace) {
LOG_ERROR(Core_ARM, "{:20}{:016X} {:016X} {:016X} {}", entry.module, entry.address,
entry.original_address, entry.offset, entry.name);
}
}
} // namespace Core
|
