From owner-svn-src-all@FreeBSD.ORG Thu Oct 13 21:07:16 2011 Return-Path: Delivered-To: svn-src-all@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 0356C106564A; Thu, 13 Oct 2011 21:07:16 +0000 (UTC) (envelope-from jhb@freebsd.org) Received: from cyrus.watson.org (cyrus.watson.org [65.122.17.42]) by mx1.freebsd.org (Postfix) with ESMTP id CC2DF8FC15; Thu, 13 Oct 2011 21:07:15 +0000 (UTC) Received: from bigwig.baldwin.cx (66.111.2.69.static.nyinternet.net [66.111.2.69]) by cyrus.watson.org (Postfix) with ESMTPSA id 81D3346B3C; Thu, 13 Oct 2011 17:07:15 -0400 (EDT) Received: from jhbbsd.localnet (unknown [209.249.190.124]) by bigwig.baldwin.cx (Postfix) with ESMTPSA id 0D9548A02E; Thu, 13 Oct 2011 17:07:15 -0400 (EDT) From: John Baldwin To: Marcel Moolenaar Date: Thu, 13 Oct 2011 17:07:14 -0400 User-Agent: KMail/1.13.5 (FreeBSD/8.2-CBSD-20110617; KDE/4.5.5; amd64; ; ) References: <201110131620.p9DGKAM2022926@svn.freebsd.org> <20111013190943.GM1511@deviant.kiev.zoral.com.ua> In-Reply-To: MIME-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Message-Id: <201110131707.14466.jhb@freebsd.org> X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.2.6 (bigwig.baldwin.cx); Thu, 13 Oct 2011 17:07:15 -0400 (EDT) Cc: Kostik Belousov , svn-src-head@freebsd.org, svn-src-all@freebsd.org, Marcel Moolenaar , src-committers@freebsd.org Subject: Re: svn commit: r226343 - head/sys/vm X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 13 Oct 2011 21:07:16 -0000 On Thursday, October 13, 2011 4:13:10 pm Marcel Moolenaar wrote: > > On Oct 13, 2011, at 12:09 PM, Kostik Belousov wrote: > > > On Thu, Oct 13, 2011 at 11:30:12AM -0700, Marcel Moolenaar wrote: > >> > >> On Oct 13, 2011, at 11:20 AM, Kostik Belousov wrote: > >> > >>> The two commits removed NX support for .data/.bss for 32bit binaries > >>> Thon amd64. is is too unfortunate. Can we claim that only old > >>> Thbinaries need this hack ? > >> > >> I don't know. When did our ABI for i386 change to have NX by default? > > I think it changed de-facto when NX appears to be supported by hardware. > > In other words, PF_R->PF_X was always considered a coincident, and not > > a promise. > > That's really besides the point. ABI changes are made deliberately > and ABIs must be well-documented for anyone to adhere to it. You > can't post hoc wave your hand and say that at some unspecified time > in the past the ABI changed: at what precise time does "supported > by hardware mean" and how does that tie to a major FreeBSD version? > > Point in case: the JDK 1.4.x still works on FreeBSD 9.x (i386), so > the ABI really hasn't changed at all in that respect. I think if you booted a FreeBSD 9.x i386 PAE kernel you'd find that the jdk did not work. That will be true for any i386 PAE kernel back to when PG_NX support was introduced. -- John Baldwin