From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 82254C43460 for ; Fri, 14 May 2021 19:56:42 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 2590E61285 for ; Fri, 14 May 2021 19:56:42 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2590E61285 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=bugs.launchpad.net Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:53204 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lhdvN-0001Cv-AP for qemu-devel@archiver.kernel.org; Fri, 14 May 2021 15:56:41 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:34928) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lhduk-0000Xz-Uw for qemu-devel@nongnu.org; Fri, 14 May 2021 15:56:04 -0400 Received: from indium.canonical.com ([91.189.90.7]:49298) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1lhdug-0005RH-Rn for qemu-devel@nongnu.org; Fri, 14 May 2021 15:56:02 -0400 Received: from loganberry.canonical.com ([91.189.90.37]) by indium.canonical.com with esmtp (Exim 4.93 #5 (Debian)) id 1lhdue-0006mc-IU for ; Fri, 14 May 2021 19:55:56 +0000 Received: from loganberry.canonical.com (localhost [127.0.0.1]) by loganberry.canonical.com (Postfix) with ESMTP id 209092E81D0 for ; Fri, 14 May 2021 19:55:53 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Fri, 14 May 2021 19:50:27 -0000 From: Bruno Haible <1705118@bugs.launchpad.net> To: qemu-devel@nongnu.org X-Launchpad-Notification-Type: bug X-Launchpad-Bug: product=qemu; status=New; importance=Undecided; assignee=None; X-Launchpad-Bug-Tags: linux-user X-Launchpad-Bug-Information-Type: Public X-Launchpad-Bug-Private: no X-Launchpad-Bug-Security-Vulnerability: no X-Launchpad-Bug-Commenters: bruno-clisp pmaydell th-huth X-Launchpad-Bug-Reporter: Bruno Haible (bruno-clisp) X-Launchpad-Bug-Modifier: Bruno Haible (bruno-clisp) References: <150041005567.6544.17518405784140614257.malonedeb@gac.canonical.com> Message-Id: <162102182757.7659.15808595341048282766.malone@gac.canonical.com> Subject: [Bug 1705118] Re: qemu user mode: rt signals not implemented for sparc guests X-Launchpad-Message-Rationale: Subscriber (QEMU) @qemu-devel-ml X-Launchpad-Message-For: qemu-devel-ml Precedence: bulk X-Generated-By: Launchpad (canonical.com); Revision="5321c3f40fa4d4b847f4e47fb766e7b95ed5036c"; Instance="production" X-Launchpad-Hash: 0ca0577ae20503a3aab348bfc1f8016d7b759022 Received-SPF: none client-ip=91.189.90.7; envelope-from=bounces@canonical.com; helo=indium.canonical.com X-Spam_score_int: -65 X-Spam_score: -6.6 X-Spam_bar: ------ X-Spam_report: (-6.6 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.248, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Bug 1705118 <1705118@bugs.launchpad.net> Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" The situation in version 6.0.0 is the same as in version 2.11.0: The cases ppc, ppc64, ppc64le, s390x are fixed, but the sparc64 executable still crashes. ** Changed in: qemu Status: Incomplete =3D> New -- = You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1705118 Title: qemu user mode: rt signals not implemented for sparc guests Status in QEMU: New Bug description: The documentation says that qemu in user mode supports POSIX signal handling. Catching SIGSEGV according to POSIX, however, does not work on ppc, ppc64, ppc64le, s390x, sparc64. It does work, however, on aarch64, alpha, arm, hppa, m68k, mips, mips64, sh4. How to reproduce: The attached program runs fine (exits with code 0) on - real hardware Linux/PowerPC64 (in 32-bit and 64-bit mode), - real hardware Linux/PowerPC64LE, - qemu-system-s390x emulated Linux/s390x, - real hardware Linux/SPARC64. $ gcc -O -Wall testsigsegv.c; ./a.out; echo $? 0 For ppc: $ powerpc-linux-gnu-gcc-5 -O -Wall -static testsigsegv.c -o testsigsegv-p= pc $ ~/inst-qemu/2.9.0/bin/qemu-ppc testsigsegv-ppc $ echo $? 3 For ppc64: $ powerpc64-linux-gnu-gcc-5 -O -Wall -static testsigsegv.c -o testsigsegv= -ppc64 $ ~/inst-qemu/2.9.0/bin/qemu-ppc64 testsigsegv-ppc64 $ echo $? 3 For ppc64le: $ powerpc64le-linux-gnu-gcc-5 -O -Wall -static testsigsegv.c -o testsigse= gv-ppc64le $ ~/inst-qemu/2.9.0/bin/qemu-ppc64le testsigsegv-ppc64le $ echo $? 3 For s390x: $ s390x-linux-gnu-gcc-5 -O -Wall -static testsigsegv.c -o testsigsegv-s39= 0x $ ~/inst-qemu/2.9.0/bin/qemu-s390x testsigsegv-s390x $ echo $? 3 $ s390x-linux-gnu-gcc-5 -O -Wall -static testsigsegv.c -DAVOID_LINUX_S390= X_COMPAT -o testsigsegv-s390x-a $ ~/inst-qemu/2.9.0/bin/qemu-s390x testsigsegv-s390x-a $ echo $? 0 So, the test fails here because the Linux/s390x kernel omits the least significant 12 bits of the fault address in the 'si_addr' field. But qemu-s390x is not compatible with the Linux/s390x behaviour: it puts the complete fault address in the 'si_addr' field. For sparc64: $ sparc64-linux-gnu-gcc-5 -O -Wall -static testsigsegv.c -o testsigsegv-s= parc64 $ ~/inst-qemu/2.9.0/bin/qemu-sparc64 testsigsegv-sparc64 Segmentation fault (core dumped) To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1705118/+subscriptions