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Diffstat (limited to 'src/core/file_sys/cheat_engine.cpp')
| -rw-r--r-- | src/core/file_sys/cheat_engine.cpp | 487 |
1 files changed, 487 insertions, 0 deletions
diff --git a/src/core/file_sys/cheat_engine.cpp b/src/core/file_sys/cheat_engine.cpp new file mode 100644 index 000000000..e4383d8c1 --- /dev/null +++ b/src/core/file_sys/cheat_engine.cpp @@ -0,0 +1,487 @@ +// Copyright 2018 yuzu emulator team +// Licensed under GPLv2 or any later version +// Refer to the license.txt file included. + +#include <locale> +#include "common/hex_util.h" +#include "common/microprofile.h" +#include "common/swap.h" +#include "core/core.h" +#include "core/core_timing.h" +#include "core/core_timing_util.h" +#include "core/file_sys/cheat_engine.h" +#include "core/hle/kernel/process.h" +#include "core/hle/service/hid/controllers/controller_base.h" +#include "core/hle/service/hid/controllers/npad.h" +#include "core/hle/service/hid/hid.h" +#include "core/hle/service/sm/sm.h" + +namespace FileSys { + +constexpr u64 CHEAT_ENGINE_TICKS = CoreTiming::BASE_CLOCK_RATE / 60; +constexpr u32 KEYPAD_BITMASK = 0x3FFFFFF; + +u64 Cheat::Address() const { + u64 out; + std::memcpy(&out, raw.data(), sizeof(u64)); + return Common::swap64(out) & 0xFFFFFFFFFF; +} + +u64 Cheat::ValueWidth(u64 offset) const { + return Value(offset, width); +} + +u64 Cheat::Value(u64 offset, u64 width) const { + u64 out; + std::memcpy(&out, raw.data() + offset, sizeof(u64)); + out = Common::swap64(out); + if (width == 8) + return out; + return out & ((1ull << (width * CHAR_BIT)) - 1); +} + +u32 Cheat::KeypadValue() const { + u32 out; + std::memcpy(&out, raw.data(), sizeof(u32)); + return Common::swap32(out) & 0x0FFFFFFF; +} + +void CheatList::SetMemoryParameters(VAddr main_begin, VAddr heap_begin, VAddr main_end, + VAddr heap_end, MemoryWriter writer, MemoryReader reader) { + this->main_region_begin = main_begin; + this->main_region_end = main_end; + this->heap_region_begin = heap_begin; + this->heap_region_end = heap_end; + this->writer = writer; + this->reader = reader; +} + +MICROPROFILE_DEFINE(Cheat_Engine, "Add-Ons", "Cheat Engine", MP_RGB(70, 200, 70)); + +void CheatList::Execute() { + MICROPROFILE_SCOPE(Cheat_Engine); + + std::fill(scratch.begin(), scratch.end(), 0); + in_standard = false; + for (std::size_t i = 0; i < master_list.size(); ++i) { + LOG_DEBUG(Common_Filesystem, "Executing block #{:08X} ({})", i, master_list[i].first); + current_block = i; + ExecuteBlock(master_list[i].second); + } + + in_standard = true; + for (std::size_t i = 0; i < standard_list.size(); ++i) { + LOG_DEBUG(Common_Filesystem, "Executing block #{:08X} ({})", i, standard_list[i].first); + current_block = i; + ExecuteBlock(standard_list[i].second); + } +} + +CheatList::CheatList(ProgramSegment master, ProgramSegment standard) + : master_list(master), standard_list(standard) {} + +bool CheatList::EvaluateConditional(const Cheat& cheat) const { + using ComparisonFunction = bool (*)(u64, u64); + constexpr ComparisonFunction comparison_functions[] = { + [](u64 a, u64 b) { return a > b; }, [](u64 a, u64 b) { return a >= b; }, + [](u64 a, u64 b) { return a < b; }, [](u64 a, u64 b) { return a <= b; }, + [](u64 a, u64 b) { return a == b; }, [](u64 a, u64 b) { return a != b; }, + }; + + if (cheat.type == CodeType::ConditionalInput) { + const auto applet_resource = Core::System::GetInstance() + .ServiceManager() + .GetService<Service::HID::Hid>("hid") + ->GetAppletResource(); + if (applet_resource == nullptr) { + LOG_WARNING( + Common_Filesystem, + "Attempted to evaluate input conditional, but applet resource is not initialized!"); + return false; + } + + const auto press_state = + applet_resource + ->GetController<Service::HID::Controller_NPad>(Service::HID::HidController::NPad) + .GetPressState(); + return ((press_state & cheat.KeypadValue()) & KEYPAD_BITMASK) != 0; + } + + ASSERT(cheat.type == CodeType::Conditional); + + const auto offset = + cheat.memory_type == MemoryType::MainNSO ? main_region_begin : heap_region_begin; + ASSERT(static_cast<u8>(cheat.comparison_op.Value()) < 6); + const auto* function = comparison_functions[static_cast<u8>(cheat.comparison_op.Value())]; + const auto addr = cheat.Address() + offset; + + return function(reader(cheat.width, SanitizeAddress(addr)), cheat.ValueWidth(8)); +} + +void CheatList::ProcessBlockPairs(const Block& block) { + block_pairs.clear(); + + u64 scope = 0; + std::map<u64, u64> pairs; + + for (std::size_t i = 0; i < block.size(); ++i) { + const auto& cheat = block[i]; + + switch (cheat.type) { + case CodeType::Conditional: + case CodeType::ConditionalInput: + pairs.insert_or_assign(scope, i); + ++scope; + break; + case CodeType::EndConditional: { + --scope; + const auto idx = pairs.at(scope); + block_pairs.insert_or_assign(idx, i); + break; + } + case CodeType::Loop: { + if (cheat.end_of_loop) { + --scope; + const auto idx = pairs.at(scope); + block_pairs.insert_or_assign(idx, i); + } else { + pairs.insert_or_assign(scope, i); + ++scope; + } + break; + } + } + } +} + +void CheatList::WriteImmediate(const Cheat& cheat) { + const auto offset = + cheat.memory_type == MemoryType::MainNSO ? main_region_begin : heap_region_begin; + auto& register_3 = scratch.at(cheat.register_3); + + const auto addr = cheat.Address() + offset + register_3; + LOG_DEBUG(Common_Filesystem, "writing value={:016X} to addr={:016X}", addr, + cheat.Value(8, cheat.width)); + writer(cheat.width, SanitizeAddress(addr), cheat.ValueWidth(8)); +} + +void CheatList::BeginConditional(const Cheat& cheat) { + if (!EvaluateConditional(cheat)) { + const auto iter = block_pairs.find(current_index); + ASSERT(iter != block_pairs.end()); + current_index = iter->second - 1; + } +} + +void CheatList::EndConditional(const Cheat& cheat) { + LOG_DEBUG(Common_Filesystem, "Ending conditional block."); +} + +void CheatList::Loop(const Cheat& cheat) { + if (cheat.end_of_loop.Value()) + ASSERT(!cheat.end_of_loop.Value()); + + auto& register_3 = scratch.at(cheat.register_3); + const auto iter = block_pairs.find(current_index); + ASSERT(iter != block_pairs.end()); + ASSERT(iter->first < iter->second); + + for (int i = cheat.Value(4, 4); i >= 0; --i) { + register_3 = i; + for (std::size_t c = iter->first + 1; c < iter->second; ++c) { + current_index = c; + ExecuteSingleCheat( + (in_standard ? standard_list : master_list)[current_block].second[c]); + } + } + + current_index = iter->second; +} + +void CheatList::LoadImmediate(const Cheat& cheat) { + auto& register_3 = scratch.at(cheat.register_3); + + LOG_DEBUG(Common_Filesystem, "setting register={:01X} equal to value={:016X}", cheat.register_3, + cheat.Value(4, 8)); + register_3 = cheat.Value(4, 8); +} + +void CheatList::LoadIndexed(const Cheat& cheat) { + const auto offset = + cheat.memory_type == MemoryType::MainNSO ? main_region_begin : heap_region_begin; + auto& register_3 = scratch.at(cheat.register_3); + + const auto addr = (cheat.load_from_register.Value() ? register_3 : offset) + cheat.Address(); + LOG_DEBUG(Common_Filesystem, "writing indexed value to register={:01X}, addr={:016X}", + cheat.register_3, addr); + register_3 = reader(cheat.width, SanitizeAddress(addr)); +} + +void CheatList::StoreIndexed(const Cheat& cheat) { + auto& register_3 = scratch.at(cheat.register_3); + + const auto addr = + register_3 + (cheat.add_additional_register.Value() ? scratch.at(cheat.register_6) : 0); + LOG_DEBUG(Common_Filesystem, "writing value={:016X} to addr={:016X}", + cheat.Value(4, cheat.width), addr); + writer(cheat.width, SanitizeAddress(addr), cheat.ValueWidth(4)); +} + +void CheatList::RegisterArithmetic(const Cheat& cheat) { + using ArithmeticFunction = u64 (*)(u64, u64); + constexpr ArithmeticFunction arithmetic_functions[] = { + [](u64 a, u64 b) { return a + b; }, [](u64 a, u64 b) { return a - b; }, + [](u64 a, u64 b) { return a * b; }, [](u64 a, u64 b) { return a << b; }, + [](u64 a, u64 b) { return a >> b; }, + }; + + using ArithmeticOverflowCheck = bool (*)(u64, u64); + constexpr ArithmeticOverflowCheck arithmetic_overflow_checks[] = { + [](u64 a, u64 b) { return a > (std::numeric_limits<u64>::max() - b); }, // a + b + [](u64 a, u64 b) { return a > (std::numeric_limits<u64>::max() + b); }, // a - b + [](u64 a, u64 b) { return a > (std::numeric_limits<u64>::max() / b); }, // a * b + [](u64 a, u64 b) { return b >= 64 || (a & ~((1ull << (64 - b)) - 1)) != 0; }, // a << b + [](u64 a, u64 b) { return b >= 64 || (a & ((1ull << b) - 1)) != 0; }, // a >> b + }; + + static_assert(sizeof(arithmetic_functions) == sizeof(arithmetic_overflow_checks), + "Missing or have extra arithmetic overflow checks compared to functions!"); + + auto& register_3 = scratch.at(cheat.register_3); + + ASSERT(static_cast<u8>(cheat.arithmetic_op.Value()) < 5); + const auto* function = arithmetic_functions[static_cast<u8>(cheat.arithmetic_op.Value())]; + const auto* overflow_function = + arithmetic_overflow_checks[static_cast<u8>(cheat.arithmetic_op.Value())]; + LOG_DEBUG(Common_Filesystem, "performing arithmetic with register={:01X}, value={:016X}", + cheat.register_3, cheat.ValueWidth(4)); + + if (overflow_function(register_3, cheat.ValueWidth(4))) { + LOG_WARNING(Common_Filesystem, + "overflow will occur when performing arithmetic operation={:02X} with operands " + "a={:016X}, b={:016X}!", + static_cast<u8>(cheat.arithmetic_op.Value()), register_3, cheat.ValueWidth(4)); + } + + register_3 = function(register_3, cheat.ValueWidth(4)); +} + +void CheatList::BeginConditionalInput(const Cheat& cheat) { + if (!EvaluateConditional(cheat)) { + const auto iter = block_pairs.find(current_index); + ASSERT(iter != block_pairs.end()); + current_index = iter->second - 1; + } +} + +VAddr CheatList::SanitizeAddress(VAddr in) const { + if ((in < main_region_begin || in >= main_region_end) && + (in < heap_region_begin || in >= heap_region_end)) { + LOG_ERROR(Common_Filesystem, + "Cheat attempting to access memory at invalid address={:016X}, if this persists, " + "the cheat may be incorrect. However, this may be normal early in execution if " + "the game has not properly set up yet.", + in); + return 0; ///< Invalid addresses will hard crash + } + + return in; +} + +void CheatList::ExecuteSingleCheat(const Cheat& cheat) { + using CheatOperationFunction = void (CheatList::*)(const Cheat&); + constexpr CheatOperationFunction cheat_operation_functions[] = { + &CheatList::WriteImmediate, &CheatList::BeginConditional, + &CheatList::EndConditional, &CheatList::Loop, + &CheatList::LoadImmediate, &CheatList::LoadIndexed, + &CheatList::StoreIndexed, &CheatList::RegisterArithmetic, + &CheatList::BeginConditionalInput, + }; + + const auto index = static_cast<u8>(cheat.type.Value()); + ASSERT(index < sizeof(cheat_operation_functions)); + const auto op = cheat_operation_functions[index]; + (this->*op)(cheat); +} + +void CheatList::ExecuteBlock(const Block& block) { + encountered_loops.clear(); + + ProcessBlockPairs(block); + for (std::size_t i = 0; i < block.size(); ++i) { + current_index = i; + ExecuteSingleCheat(block[i]); + i = current_index; + } +} + +CheatParser::~CheatParser() = default; + +CheatList CheatParser::MakeCheatList(CheatList::ProgramSegment master, + CheatList::ProgramSegment standard) const { + return {master, standard}; +} + +TextCheatParser::~TextCheatParser() = default; + +CheatList TextCheatParser::Parse(const std::vector<u8>& data) const { + std::stringstream ss; + ss.write(reinterpret_cast<const char*>(data.data()), data.size()); + + std::vector<std::string> lines; + std::string stream_line; + while (std::getline(ss, stream_line)) { + // Remove a trailing \r + if (!stream_line.empty() && stream_line.back() == '\r') + stream_line.pop_back(); + lines.push_back(std::move(stream_line)); + } + + CheatList::ProgramSegment master_list; + CheatList::ProgramSegment standard_list; + + for (std::size_t i = 0; i < lines.size(); ++i) { + auto line = lines[i]; + + if (!line.empty() && (line[0] == '[' || line[0] == '{')) { + const auto master = line[0] == '{'; + const auto begin = master ? line.find('{') : line.find('['); + const auto end = master ? line.find_last_of('}') : line.find_last_of(']'); + + ASSERT(begin != std::string::npos && end != std::string::npos); + + const std::string patch_name{line.begin() + begin + 1, line.begin() + end}; + CheatList::Block block{}; + + while (i < lines.size() - 1) { + line = lines[++i]; + if (!line.empty() && (line[0] == '[' || line[0] == '{')) { + --i; + break; + } + + if (line.size() < 8) + continue; + + Cheat out{}; + out.raw = ParseSingleLineCheat(line); + block.push_back(out); + } + + (master ? master_list : standard_list).emplace_back(patch_name, block); + } + } + + return MakeCheatList(master_list, standard_list); +} + +std::array<u8, 16> TextCheatParser::ParseSingleLineCheat(const std::string& line) const { + std::array<u8, 16> out{}; + + if (line.size() < 8) + return out; + + const auto word1 = Common::HexStringToArray<sizeof(u32)>(std::string_view{line.data(), 8}); + std::memcpy(out.data(), word1.data(), sizeof(u32)); + + if (line.size() < 17 || line[8] != ' ') + return out; + + const auto word2 = Common::HexStringToArray<sizeof(u32)>(std::string_view{line.data() + 9, 8}); + std::memcpy(out.data() + sizeof(u32), word2.data(), sizeof(u32)); + + if (line.size() < 26 || line[17] != ' ') { + // Perform shifting in case value is truncated early. + const auto type = static_cast<CodeType>((out[0] & 0xF0) >> 4); + if (type == CodeType::Loop || type == CodeType::LoadImmediate || + type == CodeType::StoreIndexed || type == CodeType::RegisterArithmetic) { + std::memcpy(out.data() + 8, out.data() + 4, sizeof(u32)); + std::memset(out.data() + 4, 0, sizeof(u32)); + } + + return out; + } + + const auto word3 = Common::HexStringToArray<sizeof(u32)>(std::string_view{line.data() + 18, 8}); + std::memcpy(out.data() + 2 * sizeof(u32), word3.data(), sizeof(u32)); + + if (line.size() < 35 || line[26] != ' ') { + // Perform shifting in case value is truncated early. + const auto type = static_cast<CodeType>((out[0] & 0xF0) >> 4); + if (type == CodeType::WriteImmediate || type == CodeType::Conditional) { + std::memcpy(out.data() + 12, out.data() + 8, sizeof(u32)); + std::memset(out.data() + 8, 0, sizeof(u32)); + } + + return out; + } + + const auto word4 = Common::HexStringToArray<sizeof(u32)>(std::string_view{line.data() + 27, 8}); + std::memcpy(out.data() + 3 * sizeof(u32), word4.data(), sizeof(u32)); + + return out; +} + +u64 MemoryReadImpl(u8 width, VAddr addr) { + switch (width) { + case 1: + return Memory::Read8(addr); + case 2: + return Memory::Read16(addr); + case 4: + return Memory::Read32(addr); + case 8: + return Memory::Read64(addr); + default: + UNREACHABLE(); + return 0; + } +} + +void MemoryWriteImpl(u8 width, VAddr addr, u64 value) { + switch (width) { + case 1: + Memory::Write8(addr, static_cast<u8>(value)); + break; + case 2: + Memory::Write16(addr, static_cast<u16>(value)); + break; + case 4: + Memory::Write32(addr, static_cast<u32>(value)); + break; + case 8: + Memory::Write64(addr, value); + break; + default: + UNREACHABLE(); + } +} + +CheatEngine::CheatEngine(std::vector<CheatList> cheats, const std::string& build_id) + : cheats(std::move(cheats)) { + event = CoreTiming::RegisterEvent( + "CheatEngine::FrameCallback::" + build_id, + [this](u64 userdata, s64 cycles_late) { FrameCallback(userdata, cycles_late); }); + CoreTiming::ScheduleEvent(CHEAT_ENGINE_TICKS, event); + + const auto& vm_manager = Core::System::GetInstance().CurrentProcess()->VMManager(); + for (auto& list : this->cheats) { + list.SetMemoryParameters( + vm_manager.GetMainCodeRegionBaseAddress(), vm_manager.GetHeapRegionBaseAddress(), + vm_manager.GetMainCodeRegionEndAddress(), vm_manager.GetHeapRegionEndAddress(), + &MemoryWriteImpl, &MemoryReadImpl); + } +} + +CheatEngine::~CheatEngine() { + CoreTiming::UnscheduleEvent(event, 0); +} + +void CheatEngine::FrameCallback(u64 userdata, int cycles_late) { + for (auto& list : cheats) + list.Execute(); + + CoreTiming::ScheduleEvent(CHEAT_ENGINE_TICKS - cycles_late, event); +} + +} // namespace FileSys |