From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 21975 invoked by alias); 16 Mar 2012 13:23:29 -0000 Received: (qmail 21958 invoked by uid 22791); 16 Mar 2012 13:23:27 -0000 X-SWARE-Spam-Status: No, hits=-6.9 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_HI X-Spam-Check-By: sourceware.org Received: from smtp2-v.fe.bosch.de (HELO smtp2-v.fe.bosch.de) (139.15.237.6) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Fri, 16 Mar 2012 13:23:14 +0000 Received: from vsmta14.fe.internet.bosch.com (unknown [10.4.98.30]) by imta24.fe.bosch.de (Postfix) with ESMTP id C96F7B0021D; Fri, 16 Mar 2012 14:23:12 +0100 (CET) Received: from localhost (vsgw2.fe.internet.bosch.com [10.4.98.13]) by vsmta14.fe.internet.bosch.com (Postfix) with SMTP id A4A671B40B6E; Fri, 16 Mar 2012 14:23:12 +0100 (CET) Received: from SI-MBX06.de.bosch.com ([10.3.153.49]) by fe-hub01.de.bosch.com ([10.3.153.37]) with mapi; Fri, 16 Mar 2012 14:22:57 +0100 From: "EXTERNAL Waechtler Peter (Fa. TCP, CM-AI/PJ-CF31)" To: "gcc-patches@gcc.gnu.org" CC: "libstdc++@gcc.gnu.org" , "pbrook@codesourcery.com" Date: Fri, 16 Mar 2012 13:23:00 -0000 Subject: [PATCH] eh_personality.cc: unwinding on ARM Message-ID: <274124B9C6907D4B8CE985903EAA19E91B2D361D38@SI-MBX06.de.bosch.com> Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Mailing-List: contact gcc-patches-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-patches-owner@gcc.gnu.org X-SW-Source: 2012-03/txt/msg01160.txt.bz2 Hi, I noticed a bug in the __ARM_EABI_UNWINDER__ case that shows up as a loop in backtrace(): =3D=3D=3D=3D=3D=3D=3D Backtrace: =3D=3D=3D=3D=3D=3D=3D=3D=3D /lib/libc.so.6[0x4c8c11cc] /lib/libc.so.6[0x4c8c62a8] /lib/libc.so.6(cfree+0x38)[0x4c8c63a8] ./bt(_Z6nqueenPiii+0xf0)[0xa8e0] ./bt(_Z6nqueenPiii+0xf0)[0xa8e0] ./bt(_Z6nqueenPiii+0xf0)[0xa8e0] ./bt(_Z6nqueenPiii+0xf0)[0xa8e0] [.. and so on] while a proper callstack (with demangled names and libunwind) looks like: =3D=3D=3D=3D=3D=3D backtrace (libunwind): ./bt( libunwind_backtrace +0x30)[0xb4a4] ./bt( eh_stack_unwind +0xe0)[0xb3c0] ./bt[0xc704] /lib/libc.so.6( __default_rt_sa_restorer_v2 +0x0)[0x4c883770] /lib/libc.so.6( gsignal +0x40)[0x4c88241c] /lib/libc.so.6( abort +0x1c0)[0x4c88680c] /lib/libc.so.6[0x4c8b726c] /lib/libc.so.6[0x4c8c11cc] /lib/libc.so.6[0x4c8c62a8] /lib/libc.so.6( cfree +0x38)[0x4c8c63a8] ./bt( nqueen(int*, int, int) +0xf0)[0xa8e0] ./bt( main +0x230)[0xac6c] /lib/libc.so.6( __libc_start_main +0x120)[0x4c86d104] ./bt[0xa510] The CodeSourcery toolchain contains a "fix" like the following, please consider for adding it. Best regards Peter W=E4chtler --- eh_personality.cc.orig 2012-02-28 16:35:20.000000000 +0100 +++ eh_personality.cc 2012-02-28 18:12:03.000000000 +0100 @@ -387,6 +386,9 @@ switch (state & _US_ACTION_MASK) { case _US_VIRTUAL_UNWIND_FRAME: + if (state & _US_FORCE_UNWIND) + CONTINUE_UNWINDING; + actions =3D _UA_SEARCH_PHASE; break;