suyu/src/core/arm/arm_interface.cpp
Lioncash 1c340c6efa CMakeLists: Specify -Wextra on linux builds
Allows reporting more cases where logic errors may exist, such as
implicit fallthrough cases, etc.

We currently ignore unused parameters, since we currently have many
cases where this is intentional (virtual interfaces).

While we're at it, we can also tidy up any existing code that causes
warnings. This also uncovered a few bugs as well.
2020-04-15 21:33:46 -04:00

213 lines
5.9 KiB
C++

// 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, Memory::Memory& memory) {
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 u64 tag = memory.Read64(dynamic_index);
const u64 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 = pair.first;
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& memory = system.Memory();
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, memory));
}
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