On Alpha and Integrity server systems, unwinds the call stack.

    Format

      SYS$GOTO_UNWIND  target_invo ,target_pc ,[NewRetVal] ,

                       [NewRetVal2]

    C Prototype

      int sys$goto_unwind_64  (void *target_invo_64, void

                              *(*(target_pc_64)), unsigned_int64

                              *new_retval, unsigned_int64

                              *newretval2);