Re: Emulating i486 on i386 (was: TSCs are a no-no on i386)

[Jan-Benedict Glaw <jbglaw@lug-owl.de>]

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On Thu, 2003-07-31 16:12:26 +0100, Jamie Lokier <jamie@shareable.org>
wrote in message <20030731151226.GG6410@mail.jlokier.co.uk>:
> Alan Cox wrote:
> > On Iau, 2003-07-31 at 12:38, Jan-Benedict Glaw wrote:
> > > See? It's loaded at the "ls" call, but it seems to be not loaded for
> > > apt-get.
> > 
> > Remember you need to overload signal setting functions like sigaction.
> > My guess is apt decided to disable your signal and you didnt stop it
> 
> An application might install its own SIGILL handler to emulate or trap
> _other_ instructions.  To do it properly, you have to chain the handlers.
> 
> Not sure how to do this, when you get to the stage of two LD_PRELOAD
> libraries each wanting to overload sigaction.

That's not (yet) my problem and I think it's not impossible to hook
them. _But_ before, I need to get called at all _before_ libstdc++5's
_init(). For now, I haven't managed to do that...

My hack^H^H^H^Hsources are at
http://www.lug-owl.de/~jbglaw/software/catch_sigill/ .

MfG, JBG

-- 
   Jan-Benedict Glaw       jbglaw@lug-owl.de    . +49-172-7608481
   "Eine Freie Meinung in  einem Freien Kopf    | Gegen Zensur | Gegen Krieg
    fuer einen Freien Staat voll Freier Bürger" | im Internet! |   im Irak!
      ret = do_actions((curr | FREE_SPEECH) & ~(IRAQ_WAR_2 | DRM | TCPA));

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