mirror of
https://github.com/momo5502/emulator.git
synced 2026-01-10 16:16:16 +00:00
706 lines
22 KiB
C++
706 lines
22 KiB
C++
#include "std_include.hpp"
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#include "windows_emulator.hpp"
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#include "cpu_context.hpp"
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#include <unicorn_x86_64_emulator.hpp>
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#if MOMO_ENABLE_RUST_CODE
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#include <icicle_x86_64_emulator.hpp>
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#endif
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#include <utils/io.hpp>
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#include <utils/finally.hpp>
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#include <utils/lazy_object.hpp>
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#include "exception_dispatch.hpp"
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#include "apiset/apiset.hpp"
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#include "network/static_socket_factory.hpp"
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constexpr auto MAX_INSTRUCTIONS_PER_TIME_SLICE = 100000;
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namespace
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{
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void adjust_working_directory(application_settings& app_settings)
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{
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if (!app_settings.working_directory.empty())
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{
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// Do nothing
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}
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#ifdef OS_WINDOWS
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else if (app_settings.application.is_relative())
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{
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app_settings.working_directory = std::filesystem::current_path();
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}
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#endif
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else
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{
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app_settings.working_directory = app_settings.application.parent();
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}
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}
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void adjust_application(application_settings& app_settings)
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{
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if (app_settings.application.is_relative())
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{
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app_settings.application = app_settings.working_directory / app_settings.application;
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}
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}
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void fixup_application_settings(application_settings& app_settings)
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{
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adjust_working_directory(app_settings);
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adjust_application(app_settings);
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}
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void perform_context_switch_work(windows_emulator& win_emu)
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{
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auto& devices = win_emu.process.devices;
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// Crappy mechanism to prevent mutation while iterating.
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const auto was_blocked = devices.block_mutation(true);
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const auto _ = utils::finally([&] { devices.block_mutation(was_blocked); });
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for (auto& dev : devices | std::views::values)
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{
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dev.work(win_emu);
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}
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}
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emulator_thread* get_thread_by_id(process_context64& process, const uint32_t id)
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{
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for (auto& t : process.threads | std::views::values)
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{
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if (t.id == id)
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{
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return &t;
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}
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}
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return nullptr;
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}
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void dispatch_next_apc(windows_emulator& win_emu, emulator_thread& thread)
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{
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assert(&win_emu.current_thread() == &thread);
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auto& emu = win_emu.emu();
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auto& apcs = thread.pending_apcs;
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if (apcs.empty())
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{
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return;
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}
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win_emu.log.print(color::dark_gray, "Dispatching APC...\n");
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const auto next_apx = apcs.front();
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apcs.erase(apcs.begin());
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struct
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{
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CONTEXT64 context{};
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CONTEXT_EX context_ex{};
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KCONTINUE_ARGUMENT continue_argument{};
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} stack_layout;
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static_assert(offsetof(decltype(stack_layout), continue_argument) == 0x4F0);
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stack_layout.context.P1Home = next_apx.apc_argument1;
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stack_layout.context.P2Home = next_apx.apc_argument2;
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stack_layout.context.P3Home = next_apx.apc_argument3;
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stack_layout.context.P4Home = next_apx.apc_routine;
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stack_layout.continue_argument.ContinueFlags |= KCONTINUE_FLAG_TEST_ALERT;
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auto& ctx = stack_layout.context;
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ctx.ContextFlags = CONTEXT64_ALL;
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cpu_context::save(emu, ctx);
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const auto initial_sp = emu.reg(x86_register::rsp);
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const auto new_sp = align_down(initial_sp - sizeof(stack_layout), 0x100);
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emu.write_memory(new_sp, stack_layout);
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emu.reg(x86_register::rsp, new_sp);
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emu.reg(x86_register::rip, win_emu.process.ki_user_apc_dispatcher);
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}
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bool switch_to_thread(windows_emulator& win_emu, emulator_thread& thread, const bool force = false)
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{
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if (thread.is_terminated())
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{
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return false;
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}
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auto& emu = win_emu.emu();
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auto& context = win_emu.process;
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const auto is_ready = thread.is_thread_ready(context, win_emu.clock());
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const auto can_dispatch_apcs = thread.apc_alertable && !thread.pending_apcs.empty();
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if (!is_ready && !force && !can_dispatch_apcs)
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{
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return false;
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}
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auto* active_thread = context.active_thread;
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if (active_thread != &thread)
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{
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if (active_thread)
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{
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win_emu.log.print(color::dark_gray, "Performing thread switch: %X -> %X\n", active_thread->id,
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thread.id);
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active_thread->save(emu);
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}
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context.active_thread = &thread;
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thread.restore(emu);
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}
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thread.setup_if_necessary(emu, context);
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if (can_dispatch_apcs)
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{
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thread.mark_as_ready(STATUS_USER_APC);
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dispatch_next_apc(win_emu, thread);
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}
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thread.apc_alertable = false;
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return true;
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}
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bool switch_to_thread(windows_emulator& win_emu, const handle thread_handle)
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{
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auto* thread = win_emu.process.threads.get(thread_handle);
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if (!thread)
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{
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throw std::runtime_error("Bad thread handle");
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}
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return switch_to_thread(win_emu, *thread);
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}
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bool switch_to_next_thread(windows_emulator& win_emu)
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{
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perform_context_switch_work(win_emu);
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auto& context = win_emu.process;
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bool next_thread = false;
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for (auto& t : context.threads | std::views::values)
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{
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if (next_thread)
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{
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if (switch_to_thread(win_emu, t))
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{
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return true;
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}
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continue;
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}
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if (&t == context.active_thread)
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{
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next_thread = true;
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}
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}
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for (auto& t : context.threads | std::views::values)
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{
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if (switch_to_thread(win_emu, t))
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{
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return true;
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}
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}
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return false;
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}
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struct instruction_tick_clock : utils::tick_clock
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{
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const uint64_t* instructions_{};
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instruction_tick_clock(const uint64_t& instructions, const system_time_point system_start = {},
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const steady_time_point steady_start = {})
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: tick_clock(1000, system_start, steady_start),
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instructions_(&instructions)
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{
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}
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uint64_t ticks() override
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{
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return *this->instructions_;
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}
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};
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std::unique_ptr<utils::clock> get_clock(emulator_interfaces& interfaces, const uint64_t& instructions,
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const bool use_relative_time)
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{
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if (interfaces.clock)
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{
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return std::move(interfaces.clock);
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}
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if (use_relative_time)
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{
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return std::make_unique<instruction_tick_clock>(instructions);
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}
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return std::make_unique<utils::clock>();
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}
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std::unique_ptr<network::socket_factory> get_socket_factory(emulator_interfaces& interfaces)
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{
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if (interfaces.socket_factory)
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{
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return std::move(interfaces.socket_factory);
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}
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#ifdef OS_EMSCRIPTEN
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return network::create_static_socket_factory();
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#else
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return std::make_unique<network::socket_factory>();
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#endif
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}
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}
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std::unique_ptr<x86_64_emulator> create_default_x86_64_emulator()
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{
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#if MOMO_ENABLE_RUST_CODE
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const auto* env = getenv("EMULATOR_ICICLE");
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if (env && (env == "1"sv || env == "true"sv))
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{
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return icicle::create_x86_64_emulator();
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}
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#endif
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return unicorn::create_x86_64_emulator();
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}
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windows_emulator::windows_emulator(application_settings app_settings, const emulator_settings& settings,
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emulator_callbacks callbacks, emulator_interfaces interfaces,
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std::unique_ptr<x86_64_emulator> emu)
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: windows_emulator(settings, std::move(callbacks), std::move(interfaces), std::move(emu))
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{
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fixup_application_settings(app_settings);
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this->setup_process(app_settings);
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}
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windows_emulator::windows_emulator(const emulator_settings& settings, emulator_callbacks callbacks,
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emulator_interfaces interfaces, std::unique_ptr<x86_64_emulator> emu)
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: emu_(std::move(emu)),
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clock_(get_clock(interfaces, this->executed_instructions_, settings.use_relative_time)),
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socket_factory_(get_socket_factory(interfaces)),
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emulation_root{settings.emulation_root.empty() ? settings.emulation_root : absolute(settings.emulation_root)},
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callbacks(std::move(callbacks)),
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file_sys(emulation_root.empty() ? emulation_root : emulation_root / "filesys"),
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memory(*this->emu_),
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registry(emulation_root.empty() ? settings.registry_directory : emulation_root / "registry"),
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mod_manager(memory, file_sys, this->callbacks),
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process(*this->emu_, memory, *this->clock_, this->callbacks),
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modules_(settings.modules),
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ignored_functions_(settings.ignored_functions)
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{
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#ifndef OS_WINDOWS
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if (this->emulation_root.empty())
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{
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throw std::runtime_error("Emulation root directory can not be empty!");
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}
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#endif
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for (const auto& mapping : settings.path_mappings)
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{
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this->file_sys.map(mapping.first, mapping.second);
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}
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for (const auto& mapping : settings.port_mappings)
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{
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this->map_port(mapping.first, mapping.second);
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}
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this->verbose_calls = settings.verbose_calls;
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this->silent_until_main_ = settings.silent_until_main && !settings.disable_logging;
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this->use_relative_time_ = settings.use_relative_time;
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this->log.disable_output(settings.disable_logging || this->silent_until_main_);
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this->setup_hooks();
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}
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windows_emulator::~windows_emulator() = default;
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void windows_emulator::setup_process(const application_settings& app_settings)
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{
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const auto& emu = this->emu();
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auto& context = this->process;
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this->mod_manager.map_main_modules(app_settings.application, R"(C:\Windows\System32\ntdll.dll)",
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R"(C:\Windows\System32\win32u.dll)", this->log);
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const auto* executable = this->mod_manager.executable;
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const auto* ntdll = this->mod_manager.ntdll;
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const auto* win32u = this->mod_manager.win32u;
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const auto apiset_data = apiset::obtain(this->emulation_root);
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this->process.setup(this->emu(), this->memory, app_settings, *executable, *ntdll, apiset_data);
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const auto ntdll_data = emu.read_memory(ntdll->image_base, static_cast<size_t>(ntdll->size_of_image));
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const auto win32u_data = emu.read_memory(win32u->image_base, static_cast<size_t>(win32u->size_of_image));
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this->dispatcher.setup(ntdll->exports, ntdll_data, win32u->exports, win32u_data);
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const auto main_thread_id =
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context.create_thread(this->memory, this->mod_manager.executable->entry_point, 0, 0, false);
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switch_to_thread(*this, main_thread_id);
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}
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void windows_emulator::yield_thread(const bool alertable)
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{
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this->switch_thread_ = true;
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this->current_thread().apc_alertable = alertable;
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this->emu().stop();
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}
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void windows_emulator::perform_thread_switch()
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{
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this->switch_thread_ = false;
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while (!switch_to_next_thread(*this))
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{
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if (this->use_relative_time_)
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{
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this->executed_instructions_ += MAX_INSTRUCTIONS_PER_TIME_SLICE;
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}
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else
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{
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std::this_thread::sleep_for(1ms);
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}
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}
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}
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bool windows_emulator::activate_thread(const uint32_t id)
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{
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auto* thread = get_thread_by_id(this->process, id);
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if (!thread)
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{
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return false;
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}
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return switch_to_thread(*this, *thread, true);
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}
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void windows_emulator::on_instruction_execution(const uint64_t address)
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{
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auto& thread = this->current_thread();
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++this->executed_instructions_;
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const auto thread_insts = ++thread.executed_instructions;
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if (thread_insts % MAX_INSTRUCTIONS_PER_TIME_SLICE == 0)
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{
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this->yield_thread();
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}
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this->process.previous_ip = this->process.current_ip;
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this->process.current_ip = this->emu().read_instruction_pointer();
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const auto is_main_exe = this->mod_manager.executable->is_within(address);
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const auto is_previous_main_exe = this->mod_manager.executable->is_within(this->process.previous_ip);
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const auto binary = utils::make_lazy([&] {
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if (is_main_exe)
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{
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return this->mod_manager.executable;
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}
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return this->mod_manager.find_by_address(address); //
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});
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const auto previous_binary = utils::make_lazy([&] {
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if (is_previous_main_exe)
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{
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return this->mod_manager.executable;
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}
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return this->mod_manager.find_by_address(this->process.previous_ip); //
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});
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const auto is_in_interesting_module = [&] {
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if (this->modules_.empty())
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{
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return false;
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}
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return (binary && this->modules_.contains(binary->name)) ||
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(previous_binary && this->modules_.contains(previous_binary->name));
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};
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const auto is_interesting_call = is_previous_main_exe //
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|| is_main_exe //
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|| is_in_interesting_module();
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if (this->silent_until_main_ && is_main_exe)
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{
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this->silent_until_main_ = false;
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this->log.disable_output(false);
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}
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if (!this->verbose && !this->verbose_calls && !is_interesting_call)
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{
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return;
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}
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if (binary)
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{
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const auto export_entry = binary->address_names.find(address);
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if (export_entry != binary->address_names.end() && !this->ignored_functions_.contains(export_entry->second))
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{
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const auto rsp = this->emu().read_stack_pointer();
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uint64_t return_address{};
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this->emu().try_read_memory(rsp, &return_address, sizeof(return_address));
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const auto* mod_name = this->mod_manager.find_name(return_address);
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log.print(is_interesting_call ? color::yellow : color::dark_gray,
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"Executing function: %s - %s (0x%" PRIx64 ") via (0x%" PRIx64 ") %s\n", binary->name.c_str(),
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export_entry->second.c_str(), address, return_address, mod_name);
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}
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else if (address == binary->entry_point)
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{
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log.print(is_interesting_call ? color::yellow : color::gray, "Executing entry point: %s (0x%" PRIx64 ")\n",
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binary->name.c_str(), address);
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}
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}
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if (!this->verbose)
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{
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return;
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}
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auto& emu = this->emu();
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// TODO: Remove or cleanup
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log.print(color::gray,
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"Inst: %16" PRIx64 " - RAX: %16" PRIx64 " - RBX: %16" PRIx64 " - RCX: %16" PRIx64 " - RDX: %16" PRIx64
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" - R8: %16" PRIx64 " - R9: %16" PRIx64 " - RDI: %16" PRIx64 " - RSI: %16" PRIx64 " - %s\n",
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address, emu.reg(x86_register::rax), emu.reg(x86_register::rbx), emu.reg(x86_register::rcx),
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emu.reg(x86_register::rdx), emu.reg(x86_register::r8), emu.reg(x86_register::r9),
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emu.reg(x86_register::rdi), emu.reg(x86_register::rsi), binary ? binary->name.c_str() : "<N/A>");
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}
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void windows_emulator::setup_hooks()
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{
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this->emu().hook_instruction(x86_hookable_instructions::syscall, [&] {
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this->dispatcher.dispatch(*this);
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return instruction_hook_continuation::skip_instruction;
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});
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this->emu().hook_instruction(x86_hookable_instructions::rdtsc, [&] {
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const auto ticks = this->clock_->timestamp_counter();
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this->emu().reg(x86_register::rax, ticks & 0xFFFFFFFF);
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this->emu().reg(x86_register::rdx, (ticks >> 32) & 0xFFFFFFFF);
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return instruction_hook_continuation::skip_instruction;
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});
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this->emu().hook_instruction(x86_hookable_instructions::invalid, [&] {
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const auto ip = this->emu().read_instruction_pointer();
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this->log.print(color::gray, "Invalid instruction at: 0x%" PRIx64 " (via 0x%" PRIx64 ")\n", ip,
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this->process.previous_ip);
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return instruction_hook_continuation::skip_instruction;
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});
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this->emu().hook_interrupt([&](const int interrupt) {
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const auto rip = this->emu().read_instruction_pointer();
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|
|
switch (interrupt)
|
|
{
|
|
case 0:
|
|
dispatch_integer_division_by_zero(this->emu(), this->process);
|
|
return;
|
|
case 1:
|
|
this->log.print(color::pink, "Singlestep: 0x%" PRIx64 "\n", rip);
|
|
dispatch_single_step(this->emu(), this->process);
|
|
return;
|
|
case 3:
|
|
this->log.print(color::pink, "Breakpoint: 0x%" PRIx64 "\n", rip);
|
|
dispatch_breakpoint(this->emu(), this->process);
|
|
return;
|
|
case 6:
|
|
dispatch_illegal_instruction_violation(this->emu(), this->process);
|
|
return;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
this->log.print(color::gray, "Interrupt: %i 0x%" PRIx64 "\n", interrupt, rip);
|
|
|
|
if (this->fuzzing || true) // TODO: Fix
|
|
{
|
|
this->process.exception_ip = rip;
|
|
this->emu().stop();
|
|
}
|
|
});
|
|
|
|
this->emu().hook_memory_violation([&](const uint64_t address, const size_t size, const memory_operation operation,
|
|
const memory_violation_type type) {
|
|
const auto permission = get_permission_string(operation);
|
|
const auto ip = this->emu().read_instruction_pointer();
|
|
const char* name = this->mod_manager.find_name(ip);
|
|
|
|
if (type == memory_violation_type::protection)
|
|
{
|
|
this->log.print(color::gray, "Protection violation: 0x%" PRIx64 " (%zX) - %s at 0x%" PRIx64 " (%s)\n",
|
|
address, size, permission.c_str(), ip, name);
|
|
}
|
|
else if (type == memory_violation_type::unmapped)
|
|
{
|
|
this->log.print(color::gray, "Mapping violation: 0x%" PRIx64 " (%zX) - %s at 0x%" PRIx64 " (%s)\n", address,
|
|
size, permission.c_str(), ip, name);
|
|
}
|
|
|
|
if (this->fuzzing)
|
|
{
|
|
this->process.exception_ip = ip;
|
|
this->emu().stop();
|
|
return memory_violation_continuation::stop;
|
|
}
|
|
|
|
dispatch_access_violation(this->emu(), this->process, address, operation);
|
|
return memory_violation_continuation::resume;
|
|
});
|
|
|
|
this->emu().hook_memory_execution([&](const uint64_t address) {
|
|
this->on_instruction_execution(address); //
|
|
});
|
|
}
|
|
|
|
void windows_emulator::start(size_t count)
|
|
{
|
|
const auto use_count = count > 0;
|
|
const auto start_instructions = this->executed_instructions_;
|
|
const auto target_instructions = start_instructions + count;
|
|
|
|
while (true)
|
|
{
|
|
if (this->switch_thread_ || !this->current_thread().is_thread_ready(this->process, this->clock()))
|
|
{
|
|
this->perform_thread_switch();
|
|
}
|
|
|
|
this->emu().start(count);
|
|
|
|
if (!this->switch_thread_ && !this->emu().has_violation())
|
|
{
|
|
break;
|
|
}
|
|
|
|
if (use_count)
|
|
{
|
|
const auto current_instructions = this->executed_instructions_;
|
|
|
|
if (current_instructions >= target_instructions)
|
|
{
|
|
break;
|
|
}
|
|
|
|
count = static_cast<size_t>(target_instructions - current_instructions);
|
|
}
|
|
}
|
|
}
|
|
|
|
void windows_emulator::serialize(utils::buffer_serializer& buffer) const
|
|
{
|
|
buffer.write(this->executed_instructions_);
|
|
buffer.write(this->switch_thread_);
|
|
buffer.write(this->use_relative_time_);
|
|
this->emu().serialize_state(buffer, false);
|
|
this->memory.serialize_memory_state(buffer, false);
|
|
this->mod_manager.serialize(buffer);
|
|
this->process.serialize(buffer);
|
|
this->dispatcher.serialize(buffer);
|
|
}
|
|
|
|
void windows_emulator::deserialize(utils::buffer_deserializer& buffer)
|
|
{
|
|
buffer.register_factory<memory_manager_wrapper>([this] {
|
|
return memory_manager_wrapper{this->memory}; //
|
|
});
|
|
|
|
buffer.register_factory<module_manager_wrapper>([this] {
|
|
return module_manager_wrapper{this->mod_manager}; //
|
|
});
|
|
|
|
buffer.register_factory<x64_emulator_wrapper>([this] {
|
|
return x64_emulator_wrapper{this->emu()}; //
|
|
});
|
|
|
|
buffer.register_factory<windows_emulator_wrapper>([this] {
|
|
return windows_emulator_wrapper{*this}; //
|
|
});
|
|
|
|
buffer.register_factory<clock_wrapper>([this] {
|
|
return clock_wrapper{this->clock()}; //
|
|
});
|
|
|
|
buffer.register_factory<socket_factory_wrapper>([this] {
|
|
return socket_factory_wrapper{this->socket_factory()}; //
|
|
});
|
|
|
|
buffer.read(this->executed_instructions_);
|
|
buffer.read(this->switch_thread_);
|
|
|
|
const auto old_relative_time = this->use_relative_time_;
|
|
buffer.read(this->use_relative_time_);
|
|
|
|
if (old_relative_time != this->use_relative_time_)
|
|
{
|
|
throw std::runtime_error("Can not deserialize emulator with different time dimensions");
|
|
}
|
|
|
|
this->memory.unmap_all_memory();
|
|
|
|
this->emu().deserialize_state(buffer, false);
|
|
this->memory.deserialize_memory_state(buffer, false);
|
|
this->mod_manager.deserialize(buffer);
|
|
this->process.deserialize(buffer);
|
|
this->dispatcher.deserialize(buffer);
|
|
}
|
|
|
|
// NOLINTNEXTLINE(readability-convert-member-functions-to-static)
|
|
void windows_emulator::save_snapshot()
|
|
{
|
|
throw std::runtime_error("Not supported");
|
|
/*utils::buffer_serializer serializer{};
|
|
this->emu().serialize_state(serializer, true);
|
|
this->memory.serialize_memory_state(serializer, true);
|
|
this->mod_manager.serialize(serializer);
|
|
this->process.serialize(serializer);
|
|
|
|
this->process_snapshot_ = serializer.move_buffer();
|
|
|
|
// TODO: Make process copyable
|
|
// this->process_snapshot_ = this->process;*/
|
|
}
|
|
|
|
// NOLINTNEXTLINE(readability-convert-member-functions-to-static)
|
|
void windows_emulator::restore_snapshot()
|
|
{
|
|
throw std::runtime_error("Not supported");
|
|
/*if (this->process_snapshot_.empty())
|
|
{
|
|
assert(false);
|
|
return;
|
|
}
|
|
|
|
utils::buffer_deserializer deserializer{this->process_snapshot_};
|
|
this->emu().deserialize_state(deserializer, true);
|
|
this->memory.deserialize_memory_state(deserializer, true);
|
|
this->mod_manager.deserialize(deserializer);
|
|
this->process.deserialize(deserializer);
|
|
// this->process = *this->process_snapshot_;*/
|
|
}
|