ILGINS (II) 3/15/72 ILGINS (II)





ILGINS (II)                  3/15/72                  ILGINS (II)





NAME            ilgins  --  catch illegal instruction trap



SYNOPSIS        sys ilgins; arg  / ilgins = 33.



DESCRIPTION     ilgins allows a program to catch illegal instruc-

                tion traps.  If arg is zero, the normal instruc-

                tion trap handling is done: the process is termi-

                nated and a core image is produced.  If arg is a

                location within the program, control is passed to

                arg when the trap occurs.



                This call is used to implement the floating point

                simulator, which catches and interprets 11/45

                floating point instructions.



                To return after catching the ilgins trap, execute

                the rti instruction.



SEE ALSO        PDP-11 manual



DIAGNOSTICS     --



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