From owner-freebsd-current@FreeBSD.ORG Wed Jan 10 15:53:34 2007 Return-Path: X-Original-To: freebsd-current@freebsd.org Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 2974216A40F for ; Wed, 10 Jan 2007 15:53:34 +0000 (UTC) (envelope-from tijl@ulyssis.org) Received: from nibbel.kulnet.kuleuven.ac.be (nibbel.kulnet.kuleuven.ac.be [134.58.240.41]) by mx1.freebsd.org (Postfix) with ESMTP id B615E13C441 for ; Wed, 10 Jan 2007 15:53:33 +0000 (UTC) (envelope-from tijl@ulyssis.org) Received: from localhost (localhost [127.0.0.1]) by nibbel.kulnet.kuleuven.ac.be (Postfix) with ESMTP id D05B14D7D1; Wed, 10 Jan 2007 16:53:32 +0100 (CET) Received: from smtp02.kuleuven.be (lepidus.kulnet.kuleuven.ac.be [134.58.240.72]) by nibbel.kulnet.kuleuven.ac.be (Postfix) with ESMTP id 390C64D7CF; Wed, 10 Jan 2007 16:53:32 +0100 (CET) Received: from kalimero.kotnet.org (kalimero.kotnet.org [10.4.16.222]) by smtp02.kuleuven.be (Postfix) with ESMTP id AD6D42CAADA; Wed, 10 Jan 2007 16:53:28 +0100 (CET) Received: from kalimero.kotnet.org (kalimero.kotnet.org [127.0.0.1]) by kalimero.kotnet.org (8.13.8/8.13.8) with ESMTP id l0AFrQUN041531; Wed, 10 Jan 2007 16:53:26 +0100 (CET) (envelope-from tijl@ulyssis.org) From: Tijl Coosemans To: freebsd-current@freebsd.org Date: Wed, 10 Jan 2007 16:53:21 +0100 User-Agent: KMail/1.9.5 References: <20070108165157.GA94941@stud.fit.vutbr.cz> <200701101151.51662.tijl@ulyssis.org> <20070110132101.k8zzn281ic8w04ks@webmail.leidinger.net> In-Reply-To: <20070110132101.k8zzn281ic8w04ks@webmail.leidinger.net> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200701101653.25773.tijl@ulyssis.org> X-Virus-Scanned: by KULeuven Antivirus Cluster Cc: Boris Samorodov , Alexander Leidinger , Divacky Roman Subject: Re: broken linuxulator in -current as of Jan 8 17:51:45 CET X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Jan 2007 15:53:34 -0000 On Wednesday 10 January 2007 13:21, Alexander Leidinger wrote: > Quoting Tijl Coosemans >> On Wednesday 10 January 2007 07:53, Alexander Leidinger wrote: >>> That's not possible. The way the linuxulator works is: >>> - the linker in userland calls open("/foo/bar") >>> - kernel looks for "/compat/linux/foo/bar" >>> * it is there -> return it >>> * it is not there -> look for "/foo/bar" >>> + if it is there -> return it >>> + if it is not there -> return error >>> - the userland get's something which may be linux or FreeBSD stuff >>> - the linker read()s this >>> - the linker sees a wrong ELF ABI and bails out >> >> That means the linker tries to open /usr/lib/librt.so.1 instead of >> /lib/librt.so.1 which doesn't exist under /compat/linux. So I added a >> symlink there. >> >> ln -s ../../lib/librt-2.3.6.so /compat/linux/usr/lib/librt.so.1 >> >> And now everything works. >> >> % ldd /compat/linux/bin/ls >> /compat/linux/bin/ls: >> librt.so.1 => /lib/obsolete/linuxthreads/librt.so.1 (0x4807c000) >> >> I think this is an easier solution than changing the runtime linker. > > Does it still work with 2.6.16 (can't test ATM)? If yes: I agree, it > is more easy and we can change this in the linux base port very fast Yes, it works with 2.6.16. Here's what I think is happening: ls is linked against librt.so.1 with /lib and /usr/lib as runtime search paths and thus: - linker calls open("/lib/librt.so.1") - kernel returns "/compat/linux/lib/librt.so.1" - linker reads and sees it requires kernel ABI 2.4.20 * when osrelease=2.6.16, this is ok, all done * when osrelease=2.4.2 + linker calls open("/usr/lib/librt.so.1") + kernel returns "/compat/linux/usr/lib/librt.so.1" (symlink) (previously kernel returned FreeBSD "/usr/lib/librt.so.1" here, which caused linker error) + linker reads and sees it requires kernel ABI 2.4.20, not ok + linker calls open("/lib/obsolete/linuxthreads/librt.so.1") + kernel returns "/compat/linux/lib/obsolete/linuxthreads/librt.so.1" + linker reads and sees it requires kernel ABI 2.2.5, ok, all done