Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754253Ab0ARP7N (ORCPT ); Mon, 18 Jan 2010 10:59:13 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754112Ab0ARP7M (ORCPT ); Mon, 18 Jan 2010 10:59:12 -0500 Received: from mx1.redhat.com ([209.132.183.28]:42284 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754075Ab0ARP7M (ORCPT ); Mon, 18 Jan 2010 10:59:12 -0500 Message-ID: <4B548521.7000704@redhat.com> Date: Mon, 18 Jan 2010 10:58:25 -0500 From: Masami Hiramatsu User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.5) Gecko/20091209 Fedora/3.0-3.fc11 Thunderbird/3.0 MIME-Version: 1.0 To: Jim Keniston CC: Peter Zijlstra , Srikar Dronamraju , Ingo Molnar , Arnaldo Carvalho de Melo , Ananth N Mavinakayanahalli , utrace-devel , Frederic Weisbecker , Maneesh Soni , Mark Wielaard , LKML Subject: Re: [RFC] [PATCH 1/7] User Space Breakpoint Assistance Layer (UBP) References: <20100116184833.2s0zihwbggkgccsk@imap.linux.ibm.com> In-Reply-To: <20100116184833.2s0zihwbggkgccsk@imap.linux.ibm.com> X-Enigmail-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1086 Lines: 29 Jim Keniston wrote: > Not really. For #3 (boosting), you need to know everything for #2, > plus be able to compute the length of each instruction -- which we can > now do for x86. To emulate an instruction (#4), you need to replicate > what it does, side-effects and all. The x86 instruction set seems to > be adding new floating-point instructions all the time, and I bet even > Masami doesn't know what they all do, but so far, they all seem to > adhere to the instruction-length rules encoded in Masami's instruction > decoder. Actually, current x86 decoder doesn't support FP(x87) instructions.(even it already supported AVX) But I think it's not so hard to add it. Thank you, -- Masami Hiramatsu Software Engineer Hitachi Computer Products (America), Inc. Software Solutions Division e-mail: mhiramat@redhat.com -- 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/