On Alpha systems, unwinds the call stack. On Integrity server
    systems, do not use this service; use $GOTO_UNWIND_64 instead.

    Format

      SYS$GOTO_UNWIND  target_invo ,target_pc ,[new_r0] ,[new_r1]

    C Prototype

      int sys$goto_unwind  (void *target_invo, void *(*(target_pc)),

                           unsigned __int64 *new_r0, unsigned

                           __int64 *new_r1);