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authorLiam <byteslice@airmail.cc>2022-04-09 05:53:42 +0200
committerLiam <byteslice@airmail.cc>2022-04-09 08:16:34 +0200
commitb29242862bb650bd3c0d3dbad0466a30d2d015e5 (patch)
tree265f95f179b17d38ee58925667ccc724948be708 /src/core/arm/symbols.cpp
parentMerge pull request #8138 from german77/data-no-race (diff)
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Diffstat (limited to 'src/core/arm/symbols.cpp')
-rw-r--r--src/core/arm/symbols.cpp190
1 files changed, 190 insertions, 0 deletions
diff --git a/src/core/arm/symbols.cpp b/src/core/arm/symbols.cpp
new file mode 100644
index 000000000..26c44f0c7
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+++ b/src/core/arm/symbols.cpp
@@ -0,0 +1,190 @@
+// 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