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Diffstat (limited to 'src/core/arm/symbols.cpp')
-rw-r--r-- | src/core/arm/symbols.cpp | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/src/core/arm/symbols.cpp b/src/core/arm/symbols.cpp new file mode 100644 index 000000000..0259c7ea2 --- /dev/null +++ b/src/core/arm/symbols.cpp @@ -0,0 +1,130 @@ +// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project +// SPDX-License-Identifier: GPL-2.0-or-later + +#include "common/bit_field.h" +#include "common/common_funcs.h" +#include "common/elf.h" +#include "core/arm/symbols.h" +#include "core/core.h" +#include "core/memory.h" + +using namespace Common::ELF; + +namespace Core { +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 == ElfDtNull) { + break; + } + + if (tag == ElfDtStrtab) { + string_table_offset = value; + } else if (tag == ElfDtSymtab) { + symbol_table_offset = value; + } else if (tag == ElfDtSyment) { + 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.st_name; + 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.st_value, symbol.st_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, Elf64_Sym>(ReadBytes); + } else { + return GetSymbols<u32, Elf32_Sym>(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, Elf64_Sym>(ReadBytes); + } else { + return GetSymbols<u32, Elf32_Sym>(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 |