Date: Thu, 13 Oct 2011 17:07:14 -0400 From: John Baldwin <jhb@freebsd.org> To: Marcel Moolenaar <marcel@xcllnt.net> Cc: Kostik Belousov <kostikbel@gmail.com>, svn-src-head@freebsd.org, svn-src-all@freebsd.org, Marcel Moolenaar <marcel@freebsd.org>, src-committers@freebsd.org Subject: Re: svn commit: r226343 - head/sys/vm Message-ID: <201110131707.14466.jhb@freebsd.org> In-Reply-To: <D6F3D623-23A5-4147-A439-746AD670DE14@xcllnt.net> References: <201110131620.p9DGKAM2022926@svn.freebsd.org> <20111013190943.GM1511@deviant.kiev.zoral.com.ua> <D6F3D623-23A5-4147-A439-746AD670DE14@xcllnt.net>
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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
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