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From: jth@linus.UUCP (Joseph T. Healey)
Newsgroups: net.unix-wizards
Subject: Process Execution with Non-Standard Entry Points
Message-ID: <122@linus.UUCP>
Date: Mon, 13-Jan-86 13:32:54 EST
Article-I.D.: linus.122
Posted: Mon Jan 13 13:32:54 1986
Date-Received: Wed, 15-Jan-86 08:11:56 EST
Distribution: net
Organization: The MITRE Corporation, Bedford, MA
Lines: 24

I am interested in taking a "snapshot" of a running process, stopping execution,
and the resuming execution at the instruction after the stop. I have success-
fully copied the state of the text, data and stack segments and constructed a 
new a.out header specifying a new entry point (a_entry).

The program calls a function apon receiving a SIGINT signal and sets the
new (desired) entry point from the saved PC on the stack, however when I try
to run the new program it always segmentation faults. I can specify any 
function address in the program as the entry point and the program can be 
successfully run.

I am assuming the since I am trying to start at the saved PC instruction that
it should be on a correct instruction address. Does anyone have any ideas
about how I can start the execution of a program at an instuction other
than a function address?? Any insight at all would be appreciated.



						Joseph T. Healey
						Technical Staff
						Mitre Corp.
						617-271-8369
						linus!jth@MITRE-BEDFORD