From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gdb-patches-return-70638-listarch-gdb-patches=sources.redhat.com@sourceware.org>
Received: (qmail 28050 invoked by alias); 2 Mar 2010 21:58:57 -0000
Received: (qmail 28034 invoked by uid 22791); 2 Mar 2010 21:58:56 -0000
X-SWARE-Spam-Status: No, hits=-1.8 required=5.0 	tests=AWL,BAYES_00,SARE_MSGID_LONG40
X-Spam-Check-By: sourceware.org
Received: from fg-out-1718.google.com (HELO fg-out-1718.google.com) (72.14.220.157)     by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Tue, 02 Mar 2010 21:58:52 +0000
Received: by fg-out-1718.google.com with SMTP id 19so266293fgg.12         for <gdb-patches@sourceware.org>; Tue, 02 Mar 2010 13:58:50 -0800 (PST)
MIME-Version: 1.0
Received: by 10.87.48.11 with SMTP id a11mr225944fgk.36.1267567130103; Tue, 02  	Mar 2010 13:58:50 -0800 (PST)
In-Reply-To: <20100302215235.GA3894@caradoc.them.org>
References: <20100301170152.GA20106@intel.com> 	 <20100302135502.GB16596@caradoc.them.org> 	 <6dc9ffc81003020608s10b76867kc04404a57df45df1@mail.gmail.com> 	 <20100302150446.GB20342@caradoc.them.org> <838waa4nj1.fsf@gnu.org> 	 <6dc9ffc81003021101yf91df69nddd08a824f777641@mail.gmail.com> 	 <83y6ia30nc.fsf@gnu.org> 	 <6dc9ffc81003021306s7cf79ef5n1069d8dcc994a3c6@mail.gmail.com> 	 <83vdde2y6g.fsf@gnu.org> <20100302215235.GA3894@caradoc.them.org>
Date: Tue, 02 Mar 2010 21:58:00 -0000
Message-ID: <6dc9ffc81003021358m7db842bcrdac32563a3b46192@mail.gmail.com>
Subject: Re: PATCH: Support x86 pseudo registers
From: "H.J. Lu" <hjl.tools@gmail.com>
To: Eli Zaretskii <eliz@gnu.org>, "H.J. Lu" <hjl.tools@gmail.com>, gdb-patches@sourceware.org
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
X-IsSubscribed: yes
Mailing-List: contact gdb-patches-help@sourceware.org; run by ezmlm
Precedence: bulk
List-Id: <gdb-patches.sourceware.org>
List-Subscribe: <mailto:gdb-patches-subscribe@sourceware.org>
List-Archive: <http://sourceware.org/ml/gdb-patches/>
List-Post: <mailto:gdb-patches@sourceware.org>
List-Help: <mailto:gdb-patches-help@sourceware.org>, <http://sourceware.org/ml/#faqs>
Sender: gdb-patches-owner@sourceware.org
X-SW-Source: 2010-03/txt/msg00083.txt.bz2

On Tue, Mar 2, 2010 at 1:52 PM, Daniel Jacobowitz <dan@codesourcery.com> wr=
ote:
> On Tue, Mar 02, 2010 at 11:47:35PM +0200, Eli Zaretskii wrote:
>> Who can help out here? =A0I can help with wording, if someone tells the
>> story.
>
> Presumably H. J. knows why he wrote the patch?
>
> I presume it lets us say $ah or $ax in addition to $eax, and lets $eax
> work on 64-bit systems where we really have $rax.
>

Exactly. I can do

(top-gdb) disass
Dump of assembler code for function main:
   0x000000000044ce70 <+0>:	sub    $0x28,%rsp
   0x000000000044ce74 <+4>:	movq   $0x0,(%rsp)
   0x000000000044ce7c <+12>:	mov    %edi,(%rsp)
=3D> 0x000000000044ce7f <+15>:	mov    %rsp,%rdi
   0x000000000044ce82 <+18>:	movq   $0x0,0x10(%rsp)
   0x000000000044ce8b <+27>:	mov    %rsi,0x8(%rsp)
   0x000000000044ce90 <+32>:	movq   $0x6a6ed0,0x18(%rsp)
   0x000000000044ce99 <+41>:	callq  0x44ceb0 <gdb_main>
   0x000000000044ce9e <+46>:	add    $0x28,%rsp
   0x000000000044cea2 <+50>:	retq
End of assembler dump.
(top-gdb) p/x $edi
$1 =3D 0x1
(top-gdb) p/x $rdi
$2 =3D 0x1
(top-gdb)


--=20
H.J.