protect_control_stack_guard_page(int protect_p, struct thread *thread);
extern void
protect_control_stack_return_guard_page(int protect_p, struct thread *thread);
extern void
protect_control_stack_guard_page(int protect_p, struct thread *thread);
extern void
protect_control_stack_return_guard_page(int protect_p, struct thread *thread);
extern void