From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 20387 invoked by alias); 2 Oct 2014 07:47:48 -0000 Mailing-List: contact ecos-bugs-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Post: List-Help: , Sender: ecos-bugs-owner@sourceware.org Received: (qmail 20367 invoked by uid 89); 2 Oct 2014 07:47:47 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-2.2 required=5.0 tests=AWL,BAYES_00 autolearn=ham version=3.3.2 X-HELO: mail.ecoscentric.com Received: from albus.ecoscentric.com (HELO mail.ecoscentric.com) (212.13.207.200) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with (AES256-GCM-SHA384 encrypted) ESMTPS; Thu, 02 Oct 2014 07:47:45 +0000 Received: from localhost (localhost [127.0.0.1]) by mail.ecoscentric.com (Postfix) with ESMTP id 90973A8953B for ; Thu, 2 Oct 2014 08:47:42 +0100 (BST) Received: from mail.ecoscentric.com ([127.0.0.1]) by localhost (albus.ecoscentric.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id M1mIkaRytloe; Thu, 2 Oct 2014 08:47:42 +0100 (BST) From: bugzilla-daemon@bugs.ecos.sourceware.org To: ecos-bugs@ecos.sourceware.org Subject: [Bug 1002013] New: [PATCH] gcc 4.7 breaks the synth Date: Thu, 02 Oct 2014 07:47:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: eCos X-Bugzilla-Component: HAL X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: wry@ecoscentric.com X-Bugzilla-Status: NEW X-Bugzilla-Priority: low X-Bugzilla-Assigned-To: unassigned@bugs.ecos.sourceware.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter cc flagtypes.name Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: http://bugs.ecos.sourceware.org/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2014/txt/msg00258.txt.bz2 Please do not reply to this email, use the link below. http://bugs.ecos.sourceware.org/show_bug.cgi?id=1002013 Bug ID: 1002013 Summary: [PATCH] gcc 4.7 breaks the synth Product: eCos Version: CVS Target: linux (Linux synthetic target) Architecture/Host HostOS: Linux OS: Status: NEW Severity: normal Priority: low Component: HAL Assignee: unassigned@bugs.ecos.sourceware.org Reporter: wry@ecoscentric.com CC: ecos-bugs@ecos.sourceware.org Flags: Patch_or_Contribution+ Created attachment 2541 --> http://bugs.ecos.sourceware.org/attachment.cgi?id=2541&action=edit Patch that fixes the synth HAL (Have discussed with jifl.) Perhaps foolhardily, I upgraded my desktop from Ubuntu 12.04 to 14.04. Long story short: * Ubuntu 14.04 ships with gcc 4.8 out of the box. * On an image for the synthetic target compiled with 4.8, __CTOR_LIST__ == __CTOR_END__. * In other words, none of our static constructors run, leaving a badly broken universe. (Simple example: The kernel test thread1 (amongst others) crashes with a segfault when it attempts to resume a thread.) * Compiling the same test code with gcc 4.6 on the same system works just fine. On further investigation, the relevant change was made in gcc 4.7, which was to rename the .ctors section of the ELF image to .init_array (and to present its members in the opposite order). Patch attached; tested with both gcc 4.6 and 4.8. This looks for both .ctors and .init_array sections and iterates through them both; it's very similar to the code in the ARM HAL which incurred this issue on the change to EABI. But I think that autodetecting on the synth is a better answer than a CDL option to switch between the two (cf. EABI); it is not exactly a resource-constrained target so the extra code size is harmless. I suspect the i386 HAL will require a similar patch, but I do not have access to a suitable test rig at the present time. -- You are receiving this mail because: You are on the CC list for the bug.