From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([2001:4830:134:3::10]:32870)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <rth7680@gmail.com>) id 1Ymr9A-0006Fh-9K
	for qemu-devel@nongnu.org; Mon, 27 Apr 2015 18:05:00 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <rth7680@gmail.com>) id 1Ymr95-000601-A4
	for qemu-devel@nongnu.org; Mon, 27 Apr 2015 18:05:00 -0400
Received: from mail-vn0-x22a.google.com ([2607:f8b0:400c:c0f::22a]:37933)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <rth7680@gmail.com>) id 1Ymr95-0005zv-6Q
	for qemu-devel@nongnu.org; Mon, 27 Apr 2015 18:04:55 -0400
Received: by vnbf1 with SMTP id f1so13939523vnb.5
	for <qemu-devel@nongnu.org>; Mon, 27 Apr 2015 15:04:54 -0700 (PDT)
Sender: Richard Henderson <rth7680@gmail.com>
Message-ID: <553EB281.20805@twiddle.net>
Date: Mon, 27 Apr 2015 15:04:49 -0700
From: Richard Henderson <rth@twiddle.net>
MIME-Version: 1.0
References: <54DD17BC.5040006@sunrus.com.cn> <54DD180B.3080004@sunrus.com.cn>
	<54DE8DCA.6030302@sunrus.com.cn>
	<CAFEAcA-FwO_k=eAk5WGJb+vs62_sXAU=q9uEmXGYry75VAtw3w@mail.gmail.com>
	<54DEBC3E.4000805@sunrus.com.cn> <54DEC303.6030502@ezchip.com>
	<CAFEAcA-VH7ptD5gGps0rH27dL1LHs0L1HiOFW=WRrD59oAzGqw@mail.gmail.com>
	<54DF6F90.60406@sunrus.com.cn> <54E1669F.9090402@sunrus.com.cn>
	<54E28B87.4020002@ezchip.com>
	<BLU436-SMTP138E2906AB68D60084D04FAB9E90@phx.gbl>
In-Reply-To: <BLU436-SMTP138E2906AB68D60084D04FAB9E90@phx.gbl>
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit
Subject: Re: [Qemu-devel] [Consult] About SPRs information
List-Id: <qemu-devel.nongnu.org>
List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.nongnu.org/archive/html/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: Chen Gang <xili_gchen_5257@hotmail.com>, Chris Metcalf <cmetcalf@ezchip.com>, Peter Maydell <peter.maydell@linaro.org>
Cc: "walt@tilera.com" <walt@tilera.com>, Riku Voipio <riku.voipio@iki.fi>, qemu-devel <qemu-devel@nongnu.org>

On 04/27/2015 02:12 PM, Chen Gang wrote:
> Now, I am blocked at SPRs: "mtspr SPR_CMPEXCH_VALUE %r12", and trying to
> solve it.

SPR_CMPEXCH_VALUE should be present in your cpu structure, should be a TCGv
like all of your other registers, and this expands to a simple move.

You will probably need to dispatch on the SPR number.  Some of these will be
normal moves to special register slots.  Some of these may require a function
call in order to handle the side effects.


r~