From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gdb-return-38593-listarch-gdb=sources.redhat.com@sourceware.org>
Received: (qmail 26213 invoked by alias); 31 Jan 2011 18:53:25 -0000
Received: (qmail 26205 invoked by uid 22791); 31 Jan 2011 18:53:24 -0000
X-SWARE-Spam-Status: No, hits=-4.8 required=5.0	tests=AWL,BAYES_00,RCVD_IN_DNSWL_HI,T_RP_MATCHES_RCVD
X-Spam-Check-By: sourceware.org
Received: from smtp-outbound-1.vmware.com (HELO smtp-outbound-1.vmware.com) (65.115.85.69)    by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Mon, 31 Jan 2011 18:53:18 +0000
Received: from mailhost4.vmware.com (mailhost4.vmware.com [10.16.67.124])	by smtp-outbound-1.vmware.com (Postfix) with ESMTP id EEC131305E;	Mon, 31 Jan 2011 10:53:14 -0800 (PST)
Received: from msnyder-server.eng.vmware.com (promd-2s-dhcp138.eng.vmware.com [10.20.124.138])	by mailhost4.vmware.com (Postfix) with ESMTP id E51B3C9FA6;	Mon, 31 Jan 2011 10:53:14 -0800 (PST)
Message-ID: <4D47051A.4080609@vmware.com>
Date: Mon, 31 Jan 2011 18:53:00 -0000
From: Michael Snyder <msnyder@vmware.com>
User-Agent: Thunderbird 2.0.0.24 (X11/20101201)
MIME-Version: 1.0
To: paawan oza <paawan1982@yahoo.com>
CC: "gdb@sourceware.org" <gdb@sourceware.org>
Subject: Re: arm reversible execution query
References: <442684.38194.qm@web112512.mail.gq1.yahoo.com> <4D309B17.7020400@vmware.com> <610357.40561.qm@web112518.mail.gq1.yahoo.com>
In-Reply-To: <610357.40561.qm@web112518.mail.gq1.yahoo.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
X-IsSubscribed: yes
Mailing-List: contact gdb-help@sourceware.org; run by ezmlm
Precedence: bulk
List-Id: <gdb.sourceware.org>
List-Subscribe: <mailto:gdb-subscribe@sourceware.org>
List-Archive: <http://sourceware.org/ml/gdb/>
List-Post: <mailto:gdb@sourceware.org>
List-Help: <mailto:gdb-help@sourceware.org>, <http://sourceware.org/ml/#faqs>
Sender: gdb-owner@sourceware.org
X-SW-Source: 2011-01/txt/msg00117.txt.bz2

paawan oza wrote:
> 
> Hi all,
> 
> I have been wroking on arm-reversible implementation and doing arm insn part. 
> I am done with framework, and supporting 30-40% on insns till now.
> when I simply test on arm board, 
> I find that,
> 
> all the memory and registers are replayed correctly and recording is happening.
> but,
> do I need to save Program counter explicitly ?
> doesnt gdb reversible framework take care of changing pc when I apply 
> reverse-stepi/nexti command ?
> 
> as i386-tdep.c, does not seem to be saving PC explicitly.
> 
> please clarify.


i386-tdep.c does save the PC ($eip), at the end of function 
i386_process_record.

If you don't save the PC, how can you do a reverse jump?