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Re: [PATCH] Fix PPC scan_prologue for code generated with -mno-update

From: Daniel Jacobowitz <drow at false dot org>
To: Mark Kettenis <mark dot kettenis at xs4all dot nl>
Cc: fnf at specifix dot com, gdb-patches at sources dot redhat dot com
Date: Fri, 16 Feb 2007 07:00:24 -0500
Subject: Re: [PATCH] Fix PPC scan_prologue for code generated with -mno-update
References: <200702151807.06227.fnf@specifix.com> <200702160822.l1G8MYL8026770@brahms.sibelius.xs4all.nl>

On Fri, Feb 16, 2007 at 09:22:34AM +0100, Mark Kettenis wrote:
> Looks reasonable to me.  However there's one thing I don't understand.
> Presuming you're using DWARF2 debug info, why does improving the
> prologue scanner make such a big difference?

Because we still haven't hooked up the DWARF2 unwinder for PowerPC;
I believe this is because of the (now long-ago fixed) botch on CFI
register numbering for lr.  The last message I recall is:

  http://sourceware.org/ml/gdb-patches/2006-05/msg00341.html

I think all that we need is a way to check the recorded LR column
and adjust register numbering based on that.

-- 
Daniel Jacobowitz
CodeSourcery

References:
- [PATCH] Fix PPC scan_prologue for code generated with -mno-update
  - From: Fred Fish
- Re: [PATCH] Fix PPC scan_prologue for code generated with -mno-update
  - From: Mark Kettenis

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