From owner-freebsd-questions@FreeBSD.ORG  Fri Aug  8 08:30:47 2008
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 8CE64106566C
	for <freebsd-questions@freebsd.org>;
	Fri,  8 Aug 2008 08:30:47 +0000 (UTC) (envelope-from ml@netfence.it)
Received: from parrot.aev.net (parrot.aev.net [212.31.247.179])
	by mx1.freebsd.org (Postfix) with ESMTP id E01448FC18
	for <freebsd-questions@freebsd.org>;
	Fri,  8 Aug 2008 08:30:46 +0000 (UTC) (envelope-from ml@netfence.it)
Received: from soth.ventu (adsl-ull-34-20.51-151.net24.it [151.51.20.34])
	(authenticated bits=128)
	by parrot.aev.net (8.14.2/8.14.2) with ESMTP id m788Uamo085339
	(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=FAIL)
	for <freebsd-questions@freebsd.org>;
	Fri, 8 Aug 2008 10:30:42 +0200 (CEST) (envelope-from ml@netfence.it)
Received: from alamar.ventu (alamar.ventu [10.1.2.18])
	by soth.ventu (8.14.2/8.14.2) with ESMTP id m788Vdgd014786;
	Fri, 8 Aug 2008 10:31:40 +0200 (CEST) (envelope-from ml@netfence.it)
Message-ID: <489C042B.4070703@netfence.it>
Date: Fri, 08 Aug 2008 10:30:35 +0200
From: Andrea Venturoli <ml@netfence.it>
User-Agent: Thunderbird 2.0.0.16 (X11/20080727)
MIME-Version: 1.0
To: Chuck Swiger <cswiger@mac.com>
References: <26ddd1750808071055i2b9976b3i4f347407d94a0813@mail.gmail.com>
	<489B3909.6080702@FreeBSD.org> <489B4D7F.1040406@netfence.it>
	<A4B69B80-CE6A-4511-920B-8D50D9917195@mac.com>
In-Reply-To: <A4B69B80-CE6A-4511-920B-8D50D9917195@mac.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
X-Scanned-By: MIMEDefang 2.64 on 212.31.247.179
Cc: FreeBSD Questions <freebsd-questions@freebsd.org>
Subject: Re: Mixing 64 and 32-bit code
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 08 Aug 2008 08:30:47 -0000

Chuck Swiger ha scritto:

> The simplest answer is that it won't work-- the syscall interface and 
> function argument/return-value sizes are going to be different between 
> 32-bit and 64-bit code.

I was quite sure of this :-(



> [1]: You can look up how thunking between Win16 and Win32 code worked here:
> 
>   http://en.wikipedia.org/wiki/Thunk#Thunk_as_compatibility_mapping
 >
 > ...but the same idea could be applied to generic 32-bit & 64-bit ELF 
code.

This is just what I was wondering about, whether it extisted or not.




> (It's really an evil thing to try to do, however.)

Yes, I know.
In my case, unfortunately, all I have is a 32-bit object, as closed 
source as it could be and I don't think we have any hope in getting the 
vendor to provide a 64-bit version (although they do for Linux).



  bye & Thanks
	av.