Date: Fri, 19 Feb 2016 06:41:01 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 207325] projects/clang380-import for TARGET_ARCH=powerpc : c++ exceptions cause SEGV (9 line program) Message-ID: <bug-207325-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207325 Bug ID: 207325 Summary: projects/clang380-import for TARGET_ARCH=powerpc : c++ exceptions cause SEGV (9 line program) Product: Base System Version: 11.0-CURRENT Hardware: ppc OS: Any Status: New Severity: Affects Only Me Priority: --- Component: bin Assignee: freebsd-bugs@FreeBSD.org Reporter: markmi@dsl-only.net When run the following 9 or so program compiled by clang 3.8.0 (from project/clang380import -r295601) for TARGET_ARCH=powerpc gets a SEGV: #include <exception> int main(void) { try { throw std::exception(); } catch (std::exception& e) {} // same result without & return 0; } (This simplifies what I found in trying to build and use some ports. For example, it blocks using "kyua test -k /usr/tests/Kyuafile", which gets a SEGV and aborts.) # clang++ -g -std=c++11 -Wall -Wpedantic exception_test.cpp # ./a.out Segmentation fault (core dumped) Trying under gdb: . . . (gdb) run Starting program: /root/c_tests/a.out Program received signal SIGSEGV, Segmentation fault. _Unwind_GetGR (context=0xffffd5a0, index=<optimized out>) at /usr/src/gnu/lib/libgcc/../../../contrib/gcc/unwind-dw2.c:177 177 return * (_Unwind_Ptr *) ptr; (gdb) bt #0 _Unwind_GetGR (context=0xffffd5a0, index=<optimized out>) at /usr/src/gnu/lib/libgcc/../../../contrib/gcc/unwind-dw2.c:177 #1 _Unwind_GetPtr (context=0xffffd5a0, index=<optimized out>) at /usr/src/gnu/lib/libgcc/../../../contrib/gcc/unwind-dw2.c:188 #2 uw_update_context (context=0xffffd5a0, fs=0xffffd0e0) at /usr/src/gnu/lib/libgcc/../../../contrib/gcc/unwind-dw2.c:1370 #3 _Unwind_RaiseException (exc=<optimized out>) at /usr/src/gnu/lib/libgcc/../../../contrib/gcc/unwind.inc:126 #4 0x4192970c in throw_exception (ex=<optimized out>) at /usr/src/lib/libcxxrt/../../contrib/libcxxrt/exception.cc:751 #5 __cxa_throw (thrown_exception=<optimized out>, tinfo=<optimized out>, dest=<optimized out>) at /usr/src/lib/libcxxrt/../../contrib/libcxxrt/exception.cc:778 #6 0x00000000 in ?? () Context details: # freebsd-version -ku; uname -aKU 11.0-CURRENT 11.0-CURRENT FreeBSD FBSDG4C1 11.0-CURRENT FreeBSD 11.0-CURRENT #4 r295601M: Sun Feb 14 15:49:49 PST 2016 markmi@FreeBSDx64:/usr/obj/clang_gcc421/powerpc.powerpc/usr/src/sys/GENERICvtsc-NODEBUG powerpc 1100097 1100097 buildkernel is via gcc 4.2.1 buildworld is via clang 3.8.0 (I've been experimenting with and submitting issues from this environment, an arm rip2 environment (clang 3.8.0 for both buildworld and buildkernel), and powerpc64 (via powerpc64-gcc, not clang). So there are some fixes/workarounds for various issues in my environment.) # svnlite status /usr/src/ ? /usr/src/.snap M /usr/src/contrib/libc++/include/__config M /usr/src/contrib/libcxxrt/guard.cc M /usr/src/contrib/llvm/tools/clang/lib/CodeGen/TargetInfo.cpp M /usr/src/lib/csu/powerpc64/Makefile ? /usr/src/restoresymtable ? /usr/src/sys/arm/conf/RPI2-NODBG M /usr/src/sys/boot/ofw/Makefile.inc M /usr/src/sys/boot/powerpc/Makefile M /usr/src/sys/boot/powerpc/Makefile.inc M /usr/src/sys/boot/uboot/Makefile.inc M /usr/src/sys/conf/Makefile.powerpc M /usr/src/sys/conf/kern.mk M /usr/src/sys/conf/kmod.mk ? /usr/src/sys/powerpc/conf/GENERIC64-NODBG ? /usr/src/sys/powerpc/conf/GENERIC64vtsc ? /usr/src/sys/powerpc/conf/GENERIC64vtsc-NODEBUG ? /usr/src/sys/powerpc/conf/GENERICvtsc ? /usr/src/sys/powerpc/conf/GENERICvtsc-NODEBUG M /usr/src/sys/powerpc/ofw/ofw_machdep.c M /usr/src/sys/powerpc/powerpc/exec_machdep.c For TARGET_ARCH=powerpc the signal delivery has a "red zone" added to deal with clang 3.8.0 moving the stack pointer late on entry to functions and early on exit from functions compared to the ABI. And there is a va_arg fix for va_list's gpr and fpr value handling to be sure the overflow area is used when it should be. There is tracking of command line option changes. -- You are receiving this mail because: You are the assignee for the bug.help
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