[llvm-bugs] [Bug 26012] New: C personality function crashes on ARM EHABI

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=26012

            Bug ID: 26012
           Summary: C personality function crashes on ARM EHABI
           Product: compiler-rt
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: compiler-rt
          Assignee: unassignedbugs at nondot.org
          Reporter: tzuhsiang.chien at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

If a C function contains a cleanup attribute and the source code is compiled
with -fexceptions, then __gcc_personality_v0() will be called by the unwinder.

However, our __gcc_personality_v0() implementation in compiler-rt is not
compatible with ARM EHABI.  Consequently, the mismatch of the function
signature will cause a segmentation fault.

$ cat cleanup.c
extern void my_throw();

int i = 0;

void callback(int *p) {
  i = 1;
}

void test_cleanup() {
  int a __attribute__((cleanup(callback))) = 1;
  my_throw();
}


$ gdb ./bad.out
... skipped ...
Program received signal SIGSEGV, Segmentation fault.
0xb6f6e910 in unw_get_proc_info () from /opt/llvm/lib/libunwind.so.1
(gdb) bt
#0  0xb6f6e910 in unw_get_proc_info () from /opt/llvm/lib/libunwind.so.1
#1  0xb6f73c70 in _Unwind_GetLanguageSpecificData ()
   from /opt/llvm/lib/libunwind.so.1
#2  0x000108fc in __gcc_personality_v0 ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
(gdb)


NOTE: There is a patch (written by Timon Van Overveldt) in the review process
that can fix the problem:
http://reviews.llvm.org/D15781

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