Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!uunet!husc6!cmcl2!nrl-cmf!ukma!psuvm.bitnet!cunyvm!unknown From: rrk@byuvax.bitnet Newsgroups: comp.os.vms Subject: Debugging /NOTRACE/NODEBUG images Message-ID: <34rrk@byuvax.bitnet> Date: Wed, 25-Nov-87 12:07:33 EST Article-I.D.: byuvax.34rrk Posted: Wed Nov 25 12:07:33 1987 Date-Received: Sun, 29-Nov-87 13:48:01 EST Lines: 22 I have found it useful in getting "inside information" on VMS and other programs that are insufficiently documented: Be sure to copy the executable to another area. This only works correctly on images which have been linked /NOTRACEBACK. It puts in a transfer address for the debugger (left out by the linker when an image is linked /NOTRACEBACK) and sets the debug bit so that the image activator activates the debugger. The parameter is the file name of the executable. $ patch/abs 'p1' e/word 2 e \+4 dep .+4 = \ e .-8 dep .+4 = \ dep .-4 = 7ffedf68 e 20 dep . = \ or 1 update