[Bug target/62231] New: Exception handling broken on powerpc-e500v2-linux-gnuspe

[Bug target/62231] New: Exception handling broken on powerpc-e500v2-linux-gnuspe

[manfred.rudigier at omicron dot at]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62231

            Bug ID: 62231
           Summary: Exception handling broken on
                    powerpc-e500v2-linux-gnuspe
           Product: gcc
           Version: 4.8.3
            Status: UNCONFIRMED
          Severity: critical
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: manfred.rudigier at omicron dot at

Problem:
--------

The GCC exception handling mechanism for powerpc-e500v2-linux-gnuspe seems to
be broken. Every programs abort as soon as the first exception is thrown. I can
confirm that the exception handling works on at least 4.6.3 and 4.7.4, however
on 4.8.3 it does not.

Example program to reproduce the problem:
-----------------------------------------

#include <exception>
#include <stdio.h>

void doThrow()
{
    printf("Throwing now\n");
    throw std::exception();
}

int main(int argc, char **argv)
{
    try {
        doThrow();
    } catch (std::exception& e) {
        printf("Caught exception\n");
    }
    return 0;
}


GDB output:
-----------

Program received signal SIGABRT, Aborted.
0x0fc0c858 in raise () from /lib/libc.so.6
(gdb) bt
#0  0x0fc0c858 in raise () from /lib/libc.so.6
#1  0x0fc117c4 in abort () from /lib/libc.so.6
#2  0x0fd78250 in ?? () from /lib/libgcc_s.so.1
#3  0x0fd78960 in _Unwind_RaiseException () from /lib/libgcc_s.so.1
#4  0x0ff33e0c in __cxa_throw () from /lib/libstdc++.so.6
#5  0x100007dc in doThrow() ()
#6  0x10000800 in main ()
(gdb) 

GCC version:
------------

The compiler has been compiled with crosstool-ng:

./powerpc-e500v2-linux-gnuspe-gcc -v
Using built-in specs.
COLLECT_GCC=./powerpc-e500v2-linux-gnuspe-gcc
COLLECT_LTO_WRAPPER=/opt/x-tools/tron/4.8.3/powerpc-e500v2-linux-gnuspe/bin/../libexec/gcc/powerpc-e500v2-linux-gnuspe/4.8.3/lto-wrapper
Target: powerpc-e500v2-linux-gnuspe
Configured with: /home/manrud00/crosstool-ng/.build/src/gcc-4.8.3/configure
--build=i686-build_pc-linux-gnu --host=i686-build_pc-linux-gnu
--target=powerpc-e500v2-linux-gnuspe
--prefix=/home/manrud00/x-tools/powerpc-e500v2-linux-gnuspe
--with-sysroot=/home/manrud00/x-tools/powerpc-e500v2-linux-gnuspe/powerpc-e500v2-linux-gnuspe/sysroot
--enable-languages=c,c++ --with-cpu=8548 --with-tune=8548
--with-pkgversion='crosstool-NG hg+default-99029fac116b'
--disable-sjlj-exceptions --enable-__cxa_atexit --disable-libmudflap
--disable-libgomp --disable-libssp --disable-libquadmath
--disable-libquadmath-support
--with-gmp=/home/manrud00/crosstool-ng/.build/powerpc-e500v2-linux-gnuspe/buildtools
--with-mpfr=/home/manrud00/crosstool-ng/.build/powerpc-e500v2-linux-gnuspe/buildtools
--with-mpc=/home/manrud00/crosstool-ng/.build/powerpc-e500v2-linux-gnuspe/buildtools
--with-isl=/home/manrud00/crosstool-ng/.build/powerpc-e500v2-linux-gnuspe/buildtools
--with-cloog=/home/manrud00/crosstool-ng/.build/powerpc-e500v2-linux-gnuspe/buildtools
--with-libelf=/home/manrud00/crosstool-ng/.build/powerpc-e500v2-linux-gnuspe/buildtools
--with-host-libstdcxx='-static-libgcc -Wl,-Bstatic,-lstdc++,-Bdynamic -lm'
--enable-threads=posix --disable-nls --disable-multilib
--with-local-prefix=/home/manrud00/x-tools/powerpc-e500v2-linux-gnuspe/powerpc-e500v2-linux-gnuspe/sysroot
--enable-c99 --enable-long-long --enable-e500_double --with-long-double-128
Thread model: posix
gcc version 4.8.3

[Bug target/62231] Exception handling broken on powerpc-e500v2-linux-gnuspe

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62231

Arseny Solokha <asolokha at gmx dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |asolokha at gmx dot com

--- Comment #1 from Arseny Solokha <asolokha at gmx dot com> ---
Cannot reproduce this with neither 4.9.2 nor 5.0 (20141123) for
powerpc-e500v2-linux-gnuspe.

[Bug target/62231] Exception handling broken on powerpc-e500v2-linux-gnuspe

[manfred.rudigier at omicron dot at]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62231

--- Comment #3 from manfred.rudigier at omicron dot at ---
I was probably to enthusiastic, the problem is still there, even in GCC 4.9.2.
In order to reproduce the bug, you either have to use a root file system which
was also built with GCC 4.8.3 or 4.9.2, or you just link the example program
statically (which is probably the easier thing).

The problem does not seem to be in the generated binary of the compiler, but in
one of the used libs (probably libgcc_s.so). So when I link statically with the
"-static" option, I got this stacktrace in gdb:

Program received signal SIGABRT, Aborted.
0x1003d28c in raise ()
(gdb) bt
#0  0x1003d28c in raise ()
#1  0x10018e1c in abort ()
#2  0x100100bc in uw_init_context_1 ()
#3  0x10010cdc in _Unwind_RaiseException ()
#4  0x10001db4 in __cxa_throw ()
    at
/home/manrud00/crosstool-ng/.build/src/gcc-4.9.2/libstdc++-v3/libsupc++/eh_throw.cc:82
#5  0x10000c94 in doThrow() () at exception.cpp:14
#6  0x10000cb8 in main () at exception.cpp:21

[Bug target/62231] [4.8/4.9 regression] Exception handling broken on powerpc-e500v2-linux-gnuspe

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62231

Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-11-28
                 CC|                            |ebotcazou at gcc dot gnu.org
   Target Milestone|---                         |4.8.4
            Summary|Exception handling broken   |[4.8/4.9 regression]
                   |on                          |Exception handling broken
                   |powerpc-e500v2-linux-gnuspe |on
                   |                            |powerpc-e500v2-linux-gnuspe
     Ever confirmed|0                           |1
           Severity|critical                    |normal

--- Comment #4 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
It's a known issue:
  https://gcc.gnu.org/ml/gcc-patches/2014-09/msg02625.html
and
  https://gcc.gnu.org/ml/gcc-patches/2014-10/msg02605.html
have the complete fix I think.

[Bug target/62231] [4.8/4.9 regression] Exception handling broken on powerpc-e500v2-linux-gnuspe

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62231

--- Comment #5 from Arseny Solokha <asolokha at gmx dot com> ---
(In reply to manfred.rudigier from comment #3)
> In order to reproduce the bug, you either have to use a root file
> system which was also built with GCC 4.8.3 or 4.9.2, or you just link the
> example program statically (which is probably the easier thing).

My root file system was built w/ 4.10.0 snapshot back in March when it hadn't
yet diverged significantly from 4.9, so it's hardly a requirement. I'll try
however to link the test case statically in Monday.

[Bug target/62231] [4.8/4.9 regression] Exception handling broken on powerpc-e500v2-linux-gnuspe

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62231

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P4

[Bug target/62231] [4.8/4.9 regression] Exception handling broken on powerpc-e500v2-linux-gnuspe

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62231

--- Comment #6 from Arseny Solokha <asolokha at gmx dot com> ---
(In reply to manfred.rudigier from comment #3)
> I was probably to enthusiastic, the problem is still there, even in GCC
> 4.9.2. In order to reproduce the bug, you either have to use a root file
> system which was also built with GCC 4.8.3 or 4.9.2, or you just link the
> example program statically (which is probably the easier thing).

OK, when I've built the program statically I reproduced the issue.

[Bug target/62231] [4.8/4.9 regression] Exception handling broken on powerpc-e500v2-linux-gnuspe

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62231

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.8.4                       |4.8.5

--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 4.8.4 has been released.

[Bug target/62231] [4.8/4.9 regression] Exception handling broken on powerpc-e500v2-linux-gnuspe

[manfred.rudigier at omicron dot at]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62231

--- Comment #8 from manfred.rudigier at omicron dot at ---
(In reply to Jakub Jelinek from comment #7)
> GCC 4.8.4 has been released.

I have tried out GCC 4.8.4 today, but it still has this issue.

[Bug target/62231] [4.8/4.9 regression] Exception handling broken on powerpc-e500v2-linux-gnuspe

[dan.wilder at watchguard dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62231

--- Comment #10 from Dan Wilder <dan.wilder at watchguard dot com> ---
Created attachment 34317
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34317&action=edit
Backport cfispan.diff to gcc-4.8.3

Attempt to backport cfispan.diff from

https://gcc.gnu.org/ml/gcc-patches/2014-09/msg02625/cfispan.diff

referenced from comment #4 here, to gcc-4.8.3 which we are using for ppc e500v2

So far as I've been able to determine so far, it works for us, passing the
repro mentioned elsewhere in this bug and also the similar repro I had
developed, and not introducing other unexpected changes.  In combination with
the msg2504.html backport also attached.

gcc-4.8.4 code in the vicinity of this patch is nearly identical with 4.8.3.

[Bug target/62231] [4.8/4.9 regression] Exception handling broken on powerpc-e500v2-linux-gnuspe

[dan.wilder at watchguard dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62231

--- Comment #11 from Dan Wilder <dan.wilder at watchguard dot com> ---
Created attachment 34318
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34318&action=edit
Backport msg02605 patch to gcc-4.8.3

Apply after other attachment

[Bug target/62231] [4.8/4.9 regression] Exception handling broken on powerpc-e500v2-linux-gnuspe

[dan.wilder at watchguard dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62231

--- Comment #12 from Dan Wilder <dan.wilder at watchguard dot com> ---
I have a backport of the patches referenced in comment 4, which I applied to
the gcc-4.8.3 we are using for e500v2.  If anybody would care to look at it,
comment whether it has any merit at all, try it etc, I'd be honored.

[Bug target/62231] [4.8/4.9 regression] Exception handling broken on powerpc-e500v2-linux-gnuspe

[manfred.rudigier at omicron dot at]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62231

--- Comment #13 from manfred.rudigier at omicron dot at ---
(In reply to Dan Wilder from comment #12)
> I have a backport of the patches referenced in comment 4, which I applied to
> the gcc-4.8.3 we are using for e500v2.  If anybody would care to look at it,
> comment whether it has any merit at all, try it etc, I'd be honored.

I have applied your backported patches to gcc 4.8.4 and can confirm that they
fix this issue.

Thanks!

[Bug target/62231] [4.8/4.9 regression] Exception handling broken on powerpc-e500v2-linux-gnuspe

[andri.yngvason at marel dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62231

Andri Yngvason <andri.yngvason at marel dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |andri.yngvason at marel dot com

--- Comment #14 from Andri Yngvason <andri.yngvason at marel dot com> ---
I have the same problem with 5.1 on a 603e, even though the patches from
comment #4 seem to have been applied. I get the same stack trace as seen in
comment #3.

It doesn't matter whether I compile with --with-cpu=603e or without.

[Bug target/62231] [4.8/4.9 regression] Exception handling broken on powerpc-e500v2-linux-gnuspe

[joseph at codesourcery dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62231

--- Comment #15 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
Any problem seen on 603e is a different issue from this (fixed) 
e500-specific issue and should not be discussed in this bug.

[Bug target/62231] [4.8/4.9 regression] Exception handling broken on powerpc-e500v2-linux-gnuspe

[andri.yngvason at marel dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62231

--- Comment #16 from Andri Yngvason <andri.yngvason at marel dot com> ---
Sorry, Joseph, I wasn't sure if this issue was fixed or not since the status is
"NEW". I'll report a new issue.

[Bug target/62231] [4.8/4.9 regression] Exception handling broken on powerpc-e500v2-linux-gnuspe

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62231

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.8.5                       |4.9.3

--- Comment #17 from Richard Biener <rguenth at gcc dot gnu.org> ---
The gcc-4_8-branch is being closed, re-targeting regressions to 4.9.3.

[Bug target/62231] [4.9 regression] Exception handling broken on powerpc-e500v2-linux-gnuspe

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62231

--- Comment #18 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 4.9.3 has been released.

[Bug target/62231] [4.9 regression] Exception handling broken on powerpc-e500v2-linux-gnuspe

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62231

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.9.3                       |4.9.4