code: def is_syscall_addr(self, addr):
          
          if self.kernel_base is None or addr < self.kernel_base:
              return False
  
          addr -= self.kernel_base
  
          if addr % self.syscall_addr_alignment != 0:
              return False
  
          addr //= self.syscall_addr_alignment
          return addr <= self.unknown_syscall_number
docs: Return whether or not the given address corresponds to a syscall implementation.