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Date: Tue, 7 Jan 2003 22:32:45 -0500
From: Daniel Jacobowitz <dan@debian.org>
To: Linus Torvalds <torvalds@transmeta.com>
Cc: Richard Henderson <rth@twiddle.net>, Zack Weinberg <zack@codesourcery.com>,
       Jamie Lokier <lk@tantalophile.demon.co.uk>,
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Subject: Re: [PATCH] Set TIF_IRET in more places
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On Tue, Jan 07, 2003 at 06:33:48PM -0800, Linus Torvalds wrote:
> 
> On Tue, 7 Jan 2003, Richard Henderson wrote:
> > > We're open to better ideas ...
> > 
> > Something like having dwarf2 unwind information for the
> > vsyscall page on the page as well?
> 
> What would the unwind info look like? The current BK kernel will put the 
> signal return into the vsyscall page, so gdb could pick up the info from 
> there. But I have no idea what the unwind info looks like, or how to tell 
> gdb about it.

Right now you can't, since GDB won't use the unwind info anyway; but
Richard is probably talking about MD_FALLBACK_FRAME_STATE_FOR, which is
used for exception handling unwinding instead of debugging unwinding.

Someday soon I hope to have GDB properly using this info, too.

-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer
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