code: def SYSCALL(cpu):
          
          cpu.RCX = cpu.RIP
          cpu.R11 = cpu.RFLAGS
          raise Syscall()
docs: Calls to interrupt procedure.
  
          The INT n instruction generates a call to the interrupt or exception handler specified
          with the destination operand. The INT n instruction is the general mnemonic for executing
          a software-generated call to an interrupt handler. The INTO instruction is a special
          mnemonic for calling overflow exception (#OF), interrupt vector number 4. The overflow
          interrupt checks the OF flag in the EFLAGS register and calls the overflow interrupt handler
          if the OF flag is set to 1.
  
          :param cpu: current CPU.