From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gdb-patches-return-32385-listarch-gdb-patches=sources.redhat.com@sources.redhat.com>
Received: (qmail 22612 invoked by alias); 18 Apr 2004 16:33:33 -0000
Mailing-List: contact gdb-patches-help@sources.redhat.com; run by ezmlm
Precedence: bulk
List-Subscribe: <mailto:gdb-patches-subscribe@sources.redhat.com>
List-Archive: <http://sources.redhat.com/ml/gdb-patches/>
List-Post: <mailto:gdb-patches@sources.redhat.com>
List-Help: <mailto:gdb-patches-help@sources.redhat.com>, <http://sources.redhat.com/ml/#faqs>
Sender: gdb-patches-owner@sources.redhat.com
Received: (qmail 22604 invoked from network); 18 Apr 2004 16:33:32 -0000
Received: from unknown (HELO aragorn.inter.net.il) (192.114.186.23)
  by sources.redhat.com with SMTP; 18 Apr 2004 16:33:32 -0000
Received: from zaretski (pns03-205-119.inter.net.il [80.230.205.119])
	by aragorn.inter.net.il (MOS 3.4.5-GR)
	with ESMTP id CSC83627;
	Sun, 18 Apr 2004 19:32:57 +0300 (IDT)
Date: Sun, 18 Apr 2004 16:33:00 -0000
From: "Eli Zaretskii" <eliz@gnu.org>
To: Brian Ford <ford@vss.fsi.com>
Message-Id: <3405-Sun18Apr2004192849+0300-eliz@gnu.org>
CC: jimb@redhat.com, gdb-patches@sources.redhat.com
In-reply-to: <Pine.GSO.4.58.0404051646530.21204@thing1-200> (message from
	Brian Ford on Mon, 5 Apr 2004 16:57:46 -0500 (CDT))
Subject: Re: [PATCH] i386_stab_reg_to_regnum (4 <-> 5, ebp <-> esp)
Reply-to: Eli Zaretskii <eliz@gnu.org>
References: <8011-Fri02Apr2004094123+0300-eliz@gnu.org>  <Pine.GSO.4.58.0404021000390.21204@thing1-200> <2719-Fri02Apr2004213907+0300-eliz@gnu.org>  <Pine.GSO.4.58.0404021648050.21204@thing1-200> <6654-Sat03Apr2004110513+0300-eliz@gnu.org>  <vt2brm647f3.fsf@zenia.home> <Pine.GSO.4.58.0404051646530.21204@thing1-200>
X-SW-Source: 2004-04/txt/msg00400.txt.bz2

> Date: Mon, 5 Apr 2004 16:57:46 -0500 (CDT)
> From: Brian Ford <ford@vss.fsi.com>
> 
> > So the only way to get those register numbers to appear at all is to
> > get a variable allocated to them.  You'll never get a variable
> > allocated to %esp.  And you'll never get a varable allocated to %ebp
> > unless you compile with -fomit-frame-pointer.  So, if I compile the
> > attached program with GCC 3.3 passing -O -fomit-frame-pointer, 'n'
> > gets allocated to %ebp.
> 
> FWIW, this does show the problem clearly on Cygwin.
> 
> ford@fordpc ~
> $ gcc -g -O -fomit-frame-pointer frameless.c -o frameless_stab.exe
> 
> ford@fordpc ~
> $ gdb frameless_stab.exe
> [...]
> (gdb) info address n
> Symbol "n" is a variable in register esp.
> (gdb) p n
> $1 = 2289692

I see a similar bug in frameless.c compiled with the DJGPP port of GCC
using -gstabs+.  So indeed the bug uncovered by Brian exists in DJGPP
as well, and the patch for stabs register renumbering will fix it for
DJGPP.  Thanks!