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Re: [RFA] Find and read symbol files after attach (linux)

On Tue, Jan 08, 2002 at 09:58:06AM -0800, Michael Snyder wrote:
> Daniel Jacobowitz wrote:
> > 
> > On Mon, Jan 07, 2002 at 04:40:00PM -0800, Michael Snyder wrote:
> > > [oops, hit send too soon...]
> > > This change allows GDB to find and read the symbol files (including
> > > all shared libraries) on Linux when you attach to an anonymous PID.
> > > It should work for all Linuxen, but for now I've only added it to the
> > > and nm-linux.h files in config/i386.  Please feel free to
> > > add it to your targets.
> > 
> > [without actually looking at it...]
> > 
> > (A) Is there any reason not to do it for all Linuxen in
> > config/nm-linux.h?
> Probably can.  I was being conservative.

I'd prefer you to do this, then.  I believe it will work.

> > (B) Why do we need /proc to do this?  We should be able to use the
> > information in the link map - which we already access in solib-svr4.h -
> > to get all of this.
> There may be another method of doing it -- I just used the
> method I know (copied from Solaris).  We need to discover
> the mapped memory regions so you can find the "debug_base".
> But this isn't one of my strong areas, so you may well know
> a better way to do the same thing.

Well, Mark's comment is completely correct.  Eventually I remembered
that this works by looking up data at _DYNAMIC, which means we need the
executable first :)

I believe that we should be able to find the rest of what we need by
the shared library code, without the mappings file, though.  I also
thought that this would just 'work'.  Have you tried with the code to
find the executable but without the code to find shared libraries? 
What happens?

Daniel Jacobowitz                           Carnegie Mellon University
MontaVista Software                         Debian GNU/Linux Developer

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