Re: A86:ret

To: assembly-86@lists.ticalc.org
Subject: Re: A86:ret
From: Brock <rbw3@dana.ucc.nau.edu>
Date: Wed, 20 Oct 1999 00:58:23 -0700 (MST)
In-reply-to: <043401bf19fc$0bda92b0$1cb51881@unm.edu>
Reply-To: assembly-86@lists.ticalc.org



Hmm... figuring out if a program will end or not... almost like the
Turning termination problem, eh? If you figure out a way to succesfully
figure out whether or not any given routine will terminate, please feel
free to tell me :)

--Brock

On Tue, 19 Oct 1999, David Phillips wrote:

> 
> Just like writing a "perfect" dissassembler would be impossible without
> running the code or incredible AI (as smart as a human), there would be no
> way to tell.  Have to run it and see if it crashes.  A program doesn't have
> to end with a physical ret, either -- it just has to return to the OS.  Like
> a <jp _clrLCD> would be the same as <call _clrLCD \ ret> but be a byte
> shorter.  Run it in VTI and see if it crashes.
> 
> What kind of people would do that, anyway?
> 
> > I learned the hardway that things don't work if you don't put a "ret" at
> the
> > end of a program, but does anyone know if there are any programs that can
> > tell me if an asm program doesn't have an ret? (I know a few people who do
> > this to existing programs to turn them into viruses.)
> 
> 
> 
>

References:

Re: A86:ret

From: "David Phillips" <david@acz.org>