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To: rth@twiddle.net
Cc: Andrew Cagney <ac131313@redhat.com>, gdb@sources.redhat.com
Subject: Re: [RFA] fix dwarf2 unwind of pc
References: <20030601013551.GA12120@redhat.com> <3ED96961.2030401@redhat.com> <20030601042745.GA12157@redhat.com>
From: Mark Kettenis <kettenis@chello.nl>
Date: Sun, 01 Jun 2003 09:44:00 -0000
In-Reply-To: Richard Henderson's message of "Sat, 31 May 2003 21:27:45 -0700"
Message-ID: <86k7c6cet9.fsf@elgar.kettenis.dyndns.org>
X-SW-Source: 2003-06/txt/msg00005.txt.bz2

Richard Henderson <rth@redhat.com> writes:

> On Sat, May 31, 2003 at 10:48:01PM -0400, Andrew Cagney wrote:
> > The loss of control is likely from a dud return address (used for 
> > setting the return breakpoint) being computed when the the code is first 
> > stepped into dummy().
> 
> Indeed, a problem with the new dwarf2 unwinder.  Neither of the
> targets Mark tested have the return address in a register.  Ok?
> 
> r~
> 
> 	* dwarf2-frame.c (dwarf2_frame_cache): Handle retaddr_column
> 	not overlapping PC_REGNUM.

Ah, GCC is trying to be economical here.  From reading the DWARF
standard I would have expected the compiler to have emitted CFA
instructions that actually put something in the return address column.
Anyway, this shouldn't hurt.

Approved.

Mark