From owner-freebsd-hackers@FreeBSD.ORG Sun Jun 10 17:37:15 2012 Return-Path: Delivered-To: freebsd-hackers@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id F167A1065672 for ; Sun, 10 Jun 2012 17:37:15 +0000 (UTC) (envelope-from avg@FreeBSD.org) Received: from citadel.icyb.net.ua (citadel.icyb.net.ua [212.40.38.140]) by mx1.freebsd.org (Postfix) with ESMTP id 455BD8FC0A for ; Sun, 10 Jun 2012 17:37:14 +0000 (UTC) Received: from porto.starpoint.kiev.ua (porto-e.starpoint.kiev.ua [212.40.38.100]) by citadel.icyb.net.ua (8.8.8p3/ICyb-2.3exp) with ESMTP id UAA20362; Sun, 10 Jun 2012 20:37:13 +0300 (EEST) (envelope-from avg@FreeBSD.org) Received: from localhost ([127.0.0.1]) by porto.starpoint.kiev.ua with esmtp (Exim 4.34 (FreeBSD)) id 1Sdm4e-000044-M9; Sun, 10 Jun 2012 20:37:12 +0300 Message-ID: <4FD4DB47.3030006@FreeBSD.org> Date: Sun, 10 Jun 2012 20:37:11 +0300 From: Andriy Gapon User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:12.0) Gecko/20120503 Thunderbird/12.0.1 MIME-Version: 1.0 To: Fabian Keil References: <4FD490D5.1070207@FreeBSD.org> <20120610152721.3b627896@fabiankeil.de> <4FD4CD8B.1080803@FreeBSD.org> In-Reply-To: <4FD4CD8B.1080803@FreeBSD.org> X-Enigmail-Version: 1.5pre Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: freebsd-hackers@FreeBSD.org Subject: Re: decoding of multi-byte nops in dtrace X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 10 Jun 2012 17:37:16 -0000 on 10/06/2012 19:38 Andriy Gapon said the following: > From a quick look at them they all seem to really never return. Either they are > noreturn type such panic, or functions that always call the functions of the > first type, or functions with endless loops in them such as top level functions > of many system threads. Not entirely true :-) random_nehemiah_read() has a via-specific instruction that dtrace doesn't understand: xstore-rng / 0x0f 0xa7 0xc0. -- Andriy Gapon