DMARC-Filter: OpenDMARC Filter v1.4.2 delorie.com 4ALIjRHU4175820
Authentication-Results: delorie.com; dmarc=pass (p=none dis=none) header.from=cygwin.com
Authentication-Results: delorie.com; spf=pass smtp.mailfrom=cygwin.com
DKIM-Filter: OpenDKIM Filter v2.11.0 delorie.com 4ALIjRHU4175820
Authentication-Results: delorie.com;
	dkim=pass (1024-bit key, unprotected) header.d=cygwin.com header.i=@cygwin.com header.a=rsa-sha256 header.s=default header.b=lS6O8120
X-Recipient: archive-cygwin AT delorie DOT com
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 785943857820
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cygwin.com;
	s=default; t=1732214726;
	bh=430dV0PYhYvRH9UhxfQsDcRZKosOhb1eYr+/3F9IQcI=;
	h=Date:To:Subject:References:In-Reply-To:List-Id:List-Unsubscribe:
	 List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To:Cc:
	 From;
	b=lS6O81201CMV8r0dylLapOusCWADLSwfgxa6Cw1eCPAyTvZ2QoQPawULTPzxOxtAH
	 nPrCn6yXtKBifNixcujIbikfK7UBTIhYfi/mjxHZ6Ebh+mYKZLg9lVAnKo9w1q9gQ7
	 gjC70XYABJUYSED/XUdLzLAkLRCILkT0V2meaYAU=
X-Original-To: cygwin AT cygwin DOT com
Delivered-To: cygwin AT cygwin DOT com
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org C7CF33857C7A
Date: Thu, 21 Nov 2024 19:44:55 +0100
To: cygwin AT cygwin DOT com
Subject: Re: include tag in uname -s for ARM64 hosts
Message-ID: <Zz9_p3T0BljtSUfb@calimero.vinschen.de>
Mail-Followup-To: cygwin AT cygwin DOT com
References: <833327a2-3a62-ed26-e4ba-5302bcdb8000 AT jdrake DOT com>
 <Zz8HHI9R5rT_iUvU AT calimero DOT vinschen DOT de>
 <cfc333ca-9b60-6af2-cfea-553b42ea8a08 AT jdrake DOT com>
MIME-Version: 1.0
Content-Disposition: inline
In-Reply-To: <cfc333ca-9b60-6af2-cfea-553b42ea8a08@jdrake.com>
X-BeenThere: cygwin AT cygwin DOT com
X-Mailman-Version: 2.1.30
Precedence: list
List-Id: General Cygwin discussions and problem reports <cygwin.cygwin.com>
List-Unsubscribe: <https://cygwin.com/mailman/options/cygwin>,
 <mailto:cygwin-request AT cygwin DOT com?subject=unsubscribe>
List-Archive: <https://cygwin.com/pipermail/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-request AT cygwin DOT com?subject=help>
List-Subscribe: <https://cygwin.com/mailman/listinfo/cygwin>,
 <mailto:cygwin-request AT cygwin DOT com?subject=subscribe>
From: Corinna Vinschen via Cygwin <cygwin AT cygwin DOT com>
Reply-To: cygwin AT cygwin DOT com
Cc: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Errors-To: cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com
Sender: "Cygwin" <cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com>

On Nov 21 10:15, Jeremy Drake via Cygwin wrote:
> On Thu, 21 Nov 2024, Corinna Vinschen via Cygwin wrote:
> 
> > > i686	x86_64	-WOW64-x64 (or omit arch to match existing?)
> >
> > Just -WOW64
> >
> > For backward compat and it's a sole representative of an intel-intel
> > emulation anyway.  I think we may safely ignore "WOW"
> >
> > > i686	ARM64	-WOW64-ARM64
> >
> > Just -ARM64
> >
> > The suffix already indicates an emulator, the target CPU is in the
> > machine field.
> >
> > > ARM	ARM64	-WOW64-ARM64
> >
> > Apart from not supporting 32 bit targets anymore (the tiny address space
> > is simply not feasible anymore) just -ARM64.  Again, the target CPU is
> > in the machine field.
> 
> 
> Interesting.  So basically disregard the wincap.is_wow64 (which is gone
> anyway in supported versions), and only look at the host arch, appending a
> tag only when it's different from Cygwin's own arch, with the special case
> that x64 is called "WOW64"?  (Maybe the special case should be if the host
> is x64 AND Cygwin is i686, otherwise use x64, just in case MS does
> something useful like adding ARM64 emulation to x86_64)

I bet, they won't.  There's no reason to.  These emulators are meant
to enable old, paid applications to run on a new system.

Now consider that 99.9% of Windows apps are x86{_64} and 0.01% of apps
are ARM64.  Of these 0.01%, 100% are available as x86{_64} app anyway.

IMHO:

  if (IsWow64Process2 (GetCurrentProcess (), &emulated, &hosted))
      && emulated != IMAGE_FILE_MACHINE_UNKNOWN)
    if (hosted == IMAGE_FILE_MACHINE_AMD64)
      strcat (sysname, "-WOW64");
    else if (hosted == IMAGE_FILE_MACHINE_ARM64)
      strcat (sysname, "-ARM64");
    else
      stract (sysname, "-WTF");
    }

And the target machine is in the machine field, so the info should
be sufficient to identify the emulation environment.


Corinna

-- 
Problem reports:      https://cygwin.com/problems.html
FAQ:                  https://cygwin.com/faq/
Documentation:        https://cygwin.com/docs.html
Unsubscribe info:     https://cygwin.com/ml/#unsubscribe-simple