Function BTCpuThreadInit

Source/Windows/WOW64/Module.cpp:597–632

void BTCpuProcessTerm(HANDLE Handle, BOOL After, ULONG Status) {}

void BTCpuThreadInit() {
  static constexpr size_t DefaultWow64CS {4};
  std::scoped_lock Lock(ThreadCreationMutex);
  FEX::Windows::InitCRTThread();
  auto* Thread = CTX->CreateThread(0, 0);

  // Default segment setup.
  auto Frame = Thread->CurrentFrame;
  auto NewSegments = new FEXCore::Core::CPUState::gdt_segment[32]();

  // Setup initial code-segment GDT
  auto& GDT = NewSegments[DefaultWow64CS];
  FEXCore::Core::CPUState::SetGDTBase(&GDT, 0);
  FEXCore::Core::CPUState::SetGDTLimit(&GDT, 0xF'FFFFU);
  GDT.L = 0; // L = Long Mode = 32-bit
  GDT.D = 1; // D = Default Operand Size = 32-bit

  Frame->State.segment_arrays[FEXCore::Core::CPUState::SEGMENT_ARRAY_INDEX_GDT] = &NewSegments[0];
  // TODO: LDTs are currently unsupported, mirror them to GDT.
  Frame->State.segment_arrays[FEXCore::Core::CPUState::SEGMENT_ARRAY_INDEX_LDT] = &NewSegments[0];

  Frame->State.cs_idx = DefaultWow64CS << 3;
  Frame->State.cs_cached = FEXCore::Core::CPUState::CalculateGDTBase(GDT);

  FEX::Windows::CallRetStack::InitializeThread(Thread);

  auto TLS = GetTLS();
  TLS.ThreadState() = Thread;
  TLS.ControlWord().fetch_or(ControlBits::WOW_CPU_AREA_DIRTY, std::memory_order::relaxed);

  auto ThreadTID = GetCurrentThreadId();
  Threads.emplace(ThreadTID, Thread);
  if (StatAllocHandler) {
    Thread->ThreadStats = StatAllocHandler->AllocateSlot(ThreadTID);
  }
}

void BTCpuThreadTerm(HANDLE Thread, LONG ExitCode) {
  if (!FEX::Windows::ValidateHandleAccess(Thread, THREAD_TERMINATE)) {