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// Copyright 2022 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include "common/bit_field.h"
#include "common/common_funcs.h"
#include "core/arm/symbols.h"
#include "core/core.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 ELF64Symbol {
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(ELF64Symbol) == 0x18, "ELF64Symbol has incorrect size.");
struct ELF32Symbol {
u32 name_index;
u32 value;
u32 size;
union {
u8 info;
BitField<0, 4, ELFSymbolType> type;
BitField<4, 4, ELFSymbolBinding> binding;
};
ELFSymbolVisibility visibility;
u16 sh_index;
};
static_assert(sizeof(ELF32Symbol) == 0x10, "ELF32Symbol has incorrect size.");
} // Anonymous namespace
namespace Symbols {
template <typename Word, typename ELFSymbol, typename ByteReader>
static Symbols GetSymbols(ByteReader ReadBytes) {
const auto Read8{[&](u64 index) {
u8 ret;
ReadBytes(&ret, index, sizeof(u8));
return ret;
}};
const auto Read32{[&](u64 index) {
u32 ret;
ReadBytes(&ret, index, sizeof(u32));
return ret;
}};
const auto ReadWord{[&](u64 index) {
Word ret;
ReadBytes(&ret, index, sizeof(Word));
return ret;
}};
const u32 mod_offset = Read32(4);
if (Read32(mod_offset) != Common::MakeMagic('M', 'O', 'D', '0')) {
return {};
}
VAddr string_table_offset{};
VAddr symbol_table_offset{};
u64 symbol_entry_size{};
const auto dynamic_offset = Read32(mod_offset + 0x4) + mod_offset;
VAddr dynamic_index = dynamic_offset;
while (true) {
const Word tag = ReadWord(dynamic_index);
const Word value = ReadWord(dynamic_index + sizeof(Word));
dynamic_index += 2 * sizeof(Word);
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 {};
}
Symbols out;
VAddr symbol_index = symbol_table_offset;
while (symbol_index < string_table_offset) {
ELFSymbol symbol{};
ReadBytes(&symbol, symbol_index, sizeof(ELFSymbol));
VAddr string_offset = string_table_offset + symbol.name_index;
std::string name;
for (u8 c = Read8(string_offset); c != 0; c = Read8(++string_offset)) {
name += static_cast<char>(c);
}
symbol_index += symbol_entry_size;
out[name] = std::make_pair(symbol.value, symbol.size);
}
return out;
}
Symbols GetSymbols(VAddr base, Core::Memory::Memory& memory, bool is_64) {
const auto ReadBytes{
[&](void* ptr, size_t offset, size_t size) { memory.ReadBlock(base + offset, ptr, size); }};
if (is_64) {
return GetSymbols<u64, ELF64Symbol>(ReadBytes);
} else {
return GetSymbols<u32, ELF32Symbol>(ReadBytes);
}
}
Symbols GetSymbols(std::span<const u8> data, bool is_64) {
const auto ReadBytes{[&](void* ptr, size_t offset, size_t size) {
std::memcpy(ptr, data.data() + offset, size);
}};
if (is_64) {
return GetSymbols<u64, ELF64Symbol>(ReadBytes);
} else {
return GetSymbols<u32, ELF32Symbol>(ReadBytes);
}
}
std::optional<std::string> GetSymbolName(const Symbols& symbols, VAddr addr) {
const auto iter = std::find_if(symbols.cbegin(), symbols.cend(), [addr](const auto& pair) {
const auto& [name, sym_info] = pair;
const auto& [start_address, size] = sym_info;
const auto end_address = start_address + size;
return addr >= start_address && addr < end_address;
});
if (iter == symbols.cend()) {
return std::nullopt;
}
return iter->first;
}
} // namespace Symbols
} // namespace Core
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