From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-383184-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 1525 invoked by alias); 10 Feb 2012 23:32:16 -0000
Received: (qmail 1514 invoked by uid 22791); 10 Feb 2012 23:32:15 -0000
X-SWARE-Spam-Status: No, hits=-2.9 required=5.0	tests=ALL_TRUSTED,AWL,BAYES_00
X-Spam-Check-By: sourceware.org
Received: from localhost (HELO gcc.gnu.org) (127.0.0.1)    by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Fri, 10 Feb 2012 23:32:02 +0000
From: "ian at airs dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/52205] New: SPARC Solaris 2.11 unwind through signal handler fails with -fnon-call-exceptions
Date: Fri, 10 Feb 2012 23:32:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: ian at airs dot com
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Changed-Fields:
Message-ID: <bug-52205-4@http.gcc.gnu.org/bugzilla/>
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
Content-Type: text/plain; charset="UTF-8"
MIME-Version: 1.0
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
X-SW-Source: 2012-02/txt/msg01118.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52205

             Bug #: 52205
           Summary: SPARC Solaris 2.11 unwind through signal handler fails
                    with -fnon-call-exceptions
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: ian@airs.com
                CC: ro@gcc.gnu.org


Compile this C++ program with -fnon-call-exceptions:

#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

void
die(const char* msg)
{
  perror(msg);
  exit(EXIT_FAILURE);
}

void
handler(int signo, siginfo_t* info, void *context)
{
  printf("in handler signal %d\n", signo);
  throw signo;
}

int
main(int, const char**)
{
  struct sigaction act;
  memset(&act, 0, sizeof act);
  act.sa_sigaction = handler;
  sigfillset(&act.sa_mask);
  act.sa_flags = SA_SIGINFO;
  if (sigaction(SIGSEGV, &act, NULL) != 0)
    die("sigaction");

  try
    {
      *reinterpret_cast<char*>(0) = 1;
    }
  catch (int signo)
    {
      printf("caught signal %d\n", signo);
      exit(EXIT_SUCCESS);
    }

  printf("did not catch\n");
  exit(EXIT_FAILURE);
}

When this program is run, it should print something like

in handler signal 11
caught signal 11

This works fine on GNU/Linux and on x86 and x86_64 Solaris 2.11.  When run on
SPARC Solaris 2.11, however, it prints

in handler signal 11
Segmentation Fault

I see this in both 32-bit and 64-bit mode.  If I tweak
libgcc/config/sparc/sol2-unwind.h so that sparc_is_sighandler sets *nframes to
3 rather than 2, then the test passes (I only tried this in 32-bit mode, not in
64-bit mode).  The cuh_pattern test in sparc_is_sighandler does not match, so
presumably it needs to be adjusted for Solaris 2.11.  However, I'm not sure how
to properly and safely correct it.