Re: HEADS UP: converting the i386 to the new frame unwinding stuff

[Andrew Cagney <ac131313@redhat.com>]

> Folks,
> 
> I've been working on making the i386 target use the new frame
> unwinding stuff.  I'm at a stage where I'm seeing no regressions on
> i386-unknown-freebsd4.7.  So I'd like to check my work in, in the not
> too distant future.  However, this is probably going to cause some
> fallout amongst the other targets.
> 
> As far as I can see *BSD, GNU/Linux, GNU/Hurd, the various System
> V-derived systems (including Solaris 2.x), Netware, DJGPP, Cygwin, and
> the various embedded targets should be fine.
> 
> My changes will break the various Sequent Symmetry targets, and I'll
> probably leave them broken (which they probably already are).
> 
> I'll see whether I can fix LynxOS before actually committing the
> patch.
> 
> However, Interix will need some serious work.  The frame methods it
> redefines will have to be replaced by *_frame_pc_unwind and
> *_frame_id_unwind functions.  Should I leave that to you Joel, or
> would you like me to write some initial versions and leave the
> necessary testing and bug-fixing to you?

Mark,

Per several recent discussions, can you create a branch and commit it to 
that.  That way I can look at it now (regardless of your intended commit 
schedule)?

I've started writing up the doco and in doing it, I suspect I may have 
found an `off by one' error with the unwinder cache.  Having a second 
implementation using the current code should help sort this out.

Andrew

(1) The best way of explaining the problem is to document how things work.