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// Copyright 2022 yuzu Emulator Project
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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 "common/bit_field.h"
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#include "common/common_funcs.h"
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#include "core/arm/symbols.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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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 ELF64Symbol {
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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(ELF64Symbol) == 0x18, "ELF64Symbol has incorrect size.");
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struct ELF32Symbol {
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u32 name_index;
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u32 value;
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u32 size;
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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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};
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static_assert(sizeof(ELF32Symbol) == 0x10, "ELF32Symbol has incorrect size.");
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} // Anonymous namespace
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namespace Symbols {
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template <typename Word, typename ELFSymbol, typename ByteReader>
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static Symbols GetSymbols(ByteReader ReadBytes) {
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const auto Read8{[&](u64 index) {
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u8 ret;
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ReadBytes(&ret, index, sizeof(u8));
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return ret;
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}};
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const auto Read32{[&](u64 index) {
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u32 ret;
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ReadBytes(&ret, index, sizeof(u32));
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return ret;
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}};
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const auto ReadWord{[&](u64 index) {
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Word ret;
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ReadBytes(&ret, index, sizeof(Word));
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return ret;
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}};
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const u32 mod_offset = Read32(4);
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if (Read32(mod_offset) != Common::MakeMagic('M', 'O', 'D', '0')) {
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return {};
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}
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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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const auto dynamic_offset = Read32(mod_offset + 0x4) + mod_offset;
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VAddr dynamic_index = dynamic_offset;
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while (true) {
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const Word tag = ReadWord(dynamic_index);
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const Word value = ReadWord(dynamic_index + sizeof(Word));
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dynamic_index += 2 * sizeof(Word);
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if (tag == ELF_DYNAMIC_TAG_NULL) {
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break;
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}
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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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}
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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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Symbols out;
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VAddr symbol_index = symbol_table_offset;
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while (symbol_index < string_table_offset) {
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ELFSymbol symbol{};
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ReadBytes(&symbol, symbol_index, sizeof(ELFSymbol));
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VAddr string_offset = string_table_offset + symbol.name_index;
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std::string name;
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for (u8 c = Read8(string_offset); c != 0; c = 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[name] = std::make_pair(symbol.value, symbol.size);
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}
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return out;
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}
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Symbols GetSymbols(VAddr base, Core::Memory::Memory& memory, bool is_64) {
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const auto ReadBytes{
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[&](void* ptr, size_t offset, size_t size) { memory.ReadBlock(base + offset, ptr, size); }};
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if (is_64) {
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return GetSymbols<u64, ELF64Symbol>(ReadBytes);
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} else {
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return GetSymbols<u32, ELF32Symbol>(ReadBytes);
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}
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}
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Symbols GetSymbols(std::span<const u8> data, bool is_64) {
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const auto ReadBytes{[&](void* ptr, size_t offset, size_t size) {
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std::memcpy(ptr, data.data() + offset, size);
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}};
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if (is_64) {
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return GetSymbols<u64, ELF64Symbol>(ReadBytes);
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} else {
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return GetSymbols<u32, ELF32Symbol>(ReadBytes);
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}
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}
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std::optional<std::string> GetSymbolName(const Symbols& symbols, VAddr addr) {
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const auto iter = std::find_if(symbols.cbegin(), symbols.cend(), [addr](const auto& pair) {
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const auto& [name, sym_info] = pair;
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const auto& [start_address, size] = sym_info;
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const auto end_address = start_address + size;
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return addr >= start_address && addr < end_address;
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});
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if (iter == symbols.cend()) {
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return std::nullopt;
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}
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return iter->first;
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}
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} // namespace Symbols
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} // namespace Core
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@ -0,0 +1,27 @@
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// Copyright 2022 yuzu Emulator Project
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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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#pragma once
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#include <map>
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#include <optional>
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#include <span>
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#include <string>
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#include <utility>
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#include "common/common_types.h"
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namespace Core::Memory {
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class Memory;
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} // namespace Core::Memory
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namespace Core::Symbols {
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using Symbols = std::map<std::string, std::pair<VAddr, std::size_t>, std::less<>>;
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Symbols GetSymbols(VAddr base, Core::Memory::Memory& memory, bool is_64 = true);
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Symbols GetSymbols(std::span<const u8> data, bool is_64 = true);
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std::optional<std::string> GetSymbolName(const Symbols& symbols, VAddr addr);
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} // namespace Core::Symbols
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