arm_interface: Expand backtrace generation
Returns results as a vector of entries for further processing. Logs addresses, offsets, and mangled name.
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@ -2,26 +2,202 @@
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <map>
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#include <optional>
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#include "common/bit_field.h"
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#include "common/common_types.h"
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#include "common/logging/log.h"
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#include "core/arm/arm_interface.h"
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#include "core/core.h"
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#include "core/memory.h"
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namespace Core {
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void ARM_Interface::LogBacktrace() const {
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VAddr fp = GetReg(29);
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VAddr lr = GetReg(30);
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const VAddr sp = GetReg(13);
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const VAddr pc = GetPC();
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LOG_ERROR(Core_ARM, "Backtrace, sp={:016X}, pc={:016X}", sp, pc);
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namespace {
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constexpr u64 ELF_DYNAMIC_TAG_NULL = 0;
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constexpr u64 ELF_DYNAMIC_TAG_STRTAB = 5;
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constexpr u64 ELF_DYNAMIC_TAG_SYMTAB = 6;
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constexpr u64 ELF_DYNAMIC_TAG_SYMENT = 11;
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enum class ELFSymbolType : u8 {
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None = 0,
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Object = 1,
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Function = 2,
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Section = 3,
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File = 4,
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Common = 5,
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TLS = 6,
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};
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enum class ELFSymbolBinding : u8 {
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Local = 0,
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Global = 1,
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Weak = 2,
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};
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enum class ELFSymbolVisibility : u8 {
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Default = 0,
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Internal = 1,
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Hidden = 2,
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Protected = 3,
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};
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struct ELFSymbol {
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u32 name_index;
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union {
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u8 info;
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BitField<0, 4, ELFSymbolType> type;
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BitField<4, 4, ELFSymbolBinding> binding;
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};
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ELFSymbolVisibility visibility;
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u16 sh_index;
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u64 value;
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u64 size;
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};
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static_assert(sizeof(ELFSymbol) == 0x18, "ELFSymbol has incorrect size.");
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using Symbols = std::vector<std::pair<ELFSymbol, std::string>>;
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Symbols GetSymbols(VAddr text_offset) {
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const auto mod_offset = text_offset + Memory::Read32(text_offset + 4);
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if (mod_offset < text_offset || (mod_offset & 0b11) != 0 ||
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Memory::Read32(mod_offset) != Common::MakeMagic('M', 'O', 'D', '0')) {
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return {};
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}
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const auto dynamic_offset = Memory::Read32(mod_offset + 0x4) + mod_offset;
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VAddr string_table_offset{};
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VAddr symbol_table_offset{};
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u64 symbol_entry_size{};
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VAddr dynamic_index = dynamic_offset;
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while (true) {
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LOG_ERROR(Core_ARM, "{:016X}", lr);
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const auto tag = Memory::Read64(dynamic_index);
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const auto value = Memory::Read64(dynamic_index + 0x8);
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dynamic_index += 0x10;
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if (tag == ELF_DYNAMIC_TAG_NULL)
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break;
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if (tag == ELF_DYNAMIC_TAG_STRTAB)
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string_table_offset = value;
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else if (tag == ELF_DYNAMIC_TAG_SYMTAB)
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symbol_table_offset = value;
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else if (tag == ELF_DYNAMIC_TAG_SYMENT)
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symbol_entry_size = value;
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}
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if (string_table_offset == 0 || symbol_table_offset == 0 || symbol_entry_size == 0) {
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return {};
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}
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const auto string_table_address = text_offset + string_table_offset;
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const auto symbol_table_address = text_offset + symbol_table_offset;
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Symbols out;
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VAddr symbol_index = symbol_table_address;
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while (symbol_index < string_table_address) {
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ELFSymbol symbol{};
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Memory::ReadBlock(symbol_index, &symbol, sizeof(ELFSymbol));
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VAddr string_offset = string_table_address + symbol.name_index;
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std::string name;
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for (u8 c = Memory::Read8(string_offset); c != 0; c = Memory::Read8(++string_offset)) {
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name += static_cast<char>(c);
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}
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symbol_index += symbol_entry_size;
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out.push_back({symbol, name});
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}
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return out;
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}
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std::optional<std::string> GetSymbolName(const Symbols& symbols, VAddr func_address) {
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const auto iter =
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std::find_if(symbols.begin(), symbols.end(), [func_address](const auto& pair) {
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const auto& [symbol, name] = pair;
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const auto end_address = symbol.value + symbol.size;
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return func_address >= symbol.value && func_address < end_address;
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});
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if (iter == symbols.end())
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return std::nullopt;
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return iter->second;
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}
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} // Anonymous namespace
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constexpr u64 SEGMENT_BASE = 0x7100000000ull;
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std::vector<ARM_Interface::BacktraceEntry> ARM_Interface::GetBacktrace() const {
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std::vector<BacktraceEntry> out;
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auto fp = GetReg(29);
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auto lr = GetReg(30);
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while (true) {
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out.push_back({"", 0, lr, 0});
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if (!fp) {
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break;
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}
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lr = Memory::Read64(fp + 8) - 4;
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fp = Memory::Read64(fp);
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}
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const auto& modules{System::GetInstance().GetRegisteredNSOModules()};
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std::map<std::string, Symbols> symbols;
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for (const auto& module : modules) {
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symbols.insert_or_assign(module.second, GetSymbols(module.first));
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}
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for (auto& entry : out) {
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VAddr base = 0;
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for (const auto& module : modules) {
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if (entry.original_address >= module.first) {
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entry.module = module.second;
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base = module.first;
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break;
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}
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}
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entry.offset = entry.original_address - base;
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entry.address = SEGMENT_BASE + entry.offset;
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if (entry.module.empty())
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entry.module = "unknown";
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const auto symbol_set = symbols.find(entry.module);
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if (symbol_set != symbols.end()) {
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const auto symbol = GetSymbolName(symbol_set->second, entry.offset);
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if (symbol.has_value()) {
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// TODO(DarkLordZach): Add demangling of symbol names.
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entry.name = *symbol;
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}
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}
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}
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return out;
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}
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void ARM_Interface::LogBacktrace() const {
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const VAddr sp = GetReg(13);
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const VAddr pc = GetPC();
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LOG_ERROR(Core_ARM, "Backtrace, sp={:016X}, pc={:016X}", sp, pc);
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LOG_ERROR(Core_ARM, "{:20}{:20}{:20}{:20}{}", "Module Name", "Address", "Original Address",
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"Offset", "Symbol");
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LOG_ERROR(Core_ARM, "{}", std::string(100, '-'));
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const auto backtrace = GetBacktrace();
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for (const auto& entry : backtrace) {
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LOG_ERROR(Core_ARM, "{:20}{:016X} {:016X} {:016X} {}", entry.module, entry.address,
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entry.original_address, entry.offset, entry.name);
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}
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}
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} // namespace Core
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@ -5,6 +5,7 @@
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#pragma once
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#include <array>
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#include <vector>
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#include "common/common_types.h"
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namespace Common {
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@ -152,6 +153,16 @@ public:
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/// Prepare core for thread reschedule (if needed to correctly handle state)
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virtual void PrepareReschedule() = 0;
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struct BacktraceEntry {
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std::string module;
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u64 address;
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u64 original_address;
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u64 offset;
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std::string name;
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};
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std::vector<BacktraceEntry> GetBacktrace() const;
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/// fp (= r29) points to the last frame record.
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/// Note that this is the frame record for the *previous* frame, not the current one.
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/// Note we need to subtract 4 from our last read to get the proper address
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