Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752171AbaJFXtF (ORCPT ); Mon, 6 Oct 2014 19:49:05 -0400 Received: from mail-bn1bon0096.outbound.protection.outlook.com ([157.56.111.96]:38944 "EHLO na01-bn1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751131AbaJFXtE (ORCPT ); Mon, 6 Oct 2014 19:49:04 -0400 Message-ID: <54332A64.5020605@caviumnetworks.com> Date: Mon, 6 Oct 2014 16:48:52 -0700 From: David Daney User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130625 Thunderbird/17.0.7 MIME-Version: 1.0 To: Andy Lutomirski CC: Rich Felker , David Daney , , , , David Daney Subject: Re: [PATCH resend] MIPS: Allow FPU emulator to use non-stack area. References: <1412627010-4311-1-git-send-email-ddaney.cavm@gmail.com> <20141006205459.GZ23797@brightrain.aerifal.cx> <5433071B.4050606@caviumnetworks.com> <20141006213101.GA23797@brightrain.aerifal.cx> <54330D79.80102@caviumnetworks.com> <20141006215813.GB23797@brightrain.aerifal.cx> <543327E7.4020608@amacapital.net> In-Reply-To: <543327E7.4020608@amacapital.net> Content-Type: text/plain; charset="windows-1252"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [64.2.3.195] X-ClientProxiedBy: BN1PR07CA0041.namprd07.prod.outlook.com (10.255.193.16) To DM2PR07MB590.namprd07.prod.outlook.com (10.141.176.140) X-Microsoft-Antispam: UriScan:; X-Microsoft-Antispam: BCL:0;PCL:0;RULEID:;SRVR:DM2PR07MB590; X-Forefront-PRVS: 03569407CC X-Forefront-Antispam-Report: SFV:NSPM;SFS:(10009020)(6009001)(479174003)(377454003)(189002)(199003)(24454002)(51704005)(66066001)(53416004)(20776003)(42186005)(54356999)(23746002)(87266999)(85852003)(65806001)(50986999)(110136001)(65956001)(65816999)(92566001)(122386002)(76176999)(21056001)(50466002)(46102003)(99136001)(92726001)(87976001)(31966008)(83506001)(69596002)(97736003)(101416001)(33656002)(102836001)(93886004)(80316001)(4396001)(85306004)(95666004)(36756003)(47776003)(76482002)(80022003)(120916001)(106356001)(105586002)(77096002)(99396003)(10300001)(107046002)(40100002)(81156004);DIR:OUT;SFP:1101;SCL:1;SRVR:DM2PR07MB590;H:dl.caveonetworks.com;FPR:;MLV:sfv;PTR:InfoNoRecords;MX:1;A:1;LANG:en; X-OriginatorOrg: caviumnetworks.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10/06/2014 04:38 PM, Andy Lutomirski wrote: > On 10/06/2014 02:58 PM, Rich Felker wrote: >> On Mon, Oct 06, 2014 at 02:45:29PM -0700, David Daney wrote: [...] >> This is a huge ill-designed mess. > > Amen. > > Can the kernel not just emulate the instructions directly? In theory it could, but since there can be implementation defined instructions, there is no way to achieve full instruction set coverage for all possible machines. > Can it single-step through them in place? No. If it could, we wouldn't be having this informative discussion. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/