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Tue, 22 Jun 2021 04:26:37 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Tue, 22 Jun 2021 04:17:50 -0000 From: Launchpad Bug Tracker <1737444@bugs.launchpad.net> To: qemu-devel@nongnu.org X-Launchpad-Notification-Type: bug X-Launchpad-Bug: product=qemu; status=Expired; importance=Undecided; assignee=None; X-Launchpad-Bug-Tags: linux-user sh4 X-Launchpad-Bug-Information-Type: Public X-Launchpad-Bug-Private: no X-Launchpad-Bug-Security-Vulnerability: no X-Launchpad-Bug-Commenters: glaubitz janitor th-huth X-Launchpad-Bug-Reporter: John Paul Adrian Glaubitz (glaubitz) X-Launchpad-Bug-Modifier: Launchpad Janitor (janitor) References: <151294713207.10703.11276532235992679828.malonedeb@wampee.canonical.com> Message-Id: <162433547116.20423.3929417050134872635.malone@loganberry.canonical.com> Subject: [Bug 1737444] Re: gccgo setcontext conftest crashes qemu-sh4 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="3619498b5524a71696f3dd612f4d11bd63449bb1"; Instance="production" X-Launchpad-Hash: 90e775a99d2fb84c214f42788bec29fda3a6a2a2 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=0.25, 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 1737444 <1737444@bugs.launchpad.net> Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" [Expired for QEMU because there has been no activity for 60 days.] ** Changed in: qemu Status: Incomplete =3D> Expired -- = You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1737444 Title: gccgo setcontext conftest crashes qemu-sh4 Status in QEMU: Expired Bug description: While testing gccgo on sh4 to add SH platform definitions to libgo, I discovered that the following conftest program which is part of the libgo configure script crashes on qemu-sh4: (sid-sh4-sbuild)root@z6:/# cat setcontext.c #include = = = = #include = = = = #include = = = = #include = = = = __thread int tls; static char stack[10 * 1024 * 1024]; static ucontext_t c; /* Called via makecontext/setcontext. */ static void cfn (void) { exit (tls); } /* Called via pthread_create. */ static void * tfn (void *dummy) { /* The thread should still see this value after calling setcontext. */ tls =3D 0; setcontext (&c); /* The call to setcontext should not return. */ abort (); } int main () { pthread_t tid; /* The thread should not see this value. */ tls =3D 1; if (getcontext (&c) < 0) abort (); c.uc_stack.ss_sp =3D stack; #ifdef MAKECONTEXT_STACK_TOP = = = = c.uc_stack.ss_sp +=3D sizeof stack; #endif = = = = c.uc_stack.ss_flags =3D 0; c.uc_stack.ss_size =3D sizeof stack; c.uc_link =3D NULL; makecontext (&c, cfn, 0); if (pthread_create (&tid, NULL, tfn, NULL) !=3D 0) abort (); if (pthread_join (tid, NULL) !=3D 0) abort (); /* The thread should have called exit. */ abort (); } (sid-sh4-sbuild)root@z6:/# gcc -o setcontext -lpthread setcontext.c (sid-sh4-sbuild)root@z6:/# ./setcontext = Unhandled trap: 0x180 pc=3D0x7f69235e sr=3D0x00000000 pr=3D0x00400710 fpscr=3D0x00080000 spc=3D0x00000000 ssr=3D0x00000000 gbr=3D0x7f658478 vbr=3D0x00000000 sgr=3D0x00000000 dbr=3D0x00000000 delayed_pc=3D0x7f692320 fpul=3D0x000000= 00 r0=3D0x00e11158 r1=3D0x00000000 r2=3D0x00000001 r3=3D0x7ffff2e0 r4=3D0x00e11068 r5=3D0x7ffff314 r6=3D0x7ffff31c r7=3D0x00000000 r8=3D0x004007b0 r9=3D0x00000000 r10=3D0x00000000 r11=3D0x00000000 r12=3D0x7f79ac54 r13=3D0x00000000 r14=3D0x7ffff288 r15=3D0x7ffff288 r16=3D0x00000000 r17=3D0x00000000 r18=3D0x00000000 r19=3D0x00000000 r20=3D0x00000000 r21=3D0x00000000 r22=3D0x00000000 r23=3D0x00000000 (sid-sh4-sbuild)root@z6:/# The same code works fine on my Renesas SH7785LCR evaluation board: root@tirpitz:~> uname -a Linux tirpitz 3.16.7-ckt7 #8 PREEMPT Fri Oct 21 18:47:41 CEST 2016 sh4a G= NU/Linux root@tirpitz:~> gcc -o setcontext setcontext.c -lpthread root@tirpitz:~> ./setcontext = root@tirpitz:~> echo $? 0 root@tirpitz:~> Due to this bug, it is not possible to compile gcc-7 with the Go frontend enabled on qemu-sh4. 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