Hello,
the attached program fails to run with a sigsegv on a IBM
power8-based system while it works flawlessly on Intel x86-64 and on a
ARM v7l.
I compiled the code against libunwind downloaded from git on October
13th using the following command:
# gcc --version
gcc (Ubuntu 4.9.1-16ubuntu6) 4.9.1
# gcc -g traverse_callers.c -o traverse_callers -L
$HOME/libunwind/git/lib64/ -lunwind -Wl,-rpath
-Wl,$HOME/libunwind/git/lib64/ -I $HOME/libunwind/git/include -O0
The debugger says:
(gdb) run
Starting program: ./traverse_callers
Program received signal SIGSEGV, Segmentation fault.
_ULppc64_step (cursor=0x3fffffffec08) at ppc64/Gstep.c:442
442 if (*inst == (0xE8410000 + 24)) {
(gdb) where
#0 _ULppc64_step (cursor=0x3fffffffec08) at ppc64/Gstep.c:442
#1 0x0000000010000810 in traverse_callstack () at traverse_callers.c:16
#2 0x000000001000089c in main (argc=1, argv=0x3ffffffff928) at
traverse_callers.c:23
Thank you
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#define UNW_LOCAL_ONLY
#include <libunwind.h>
unsigned long long traverse_callstack (void)
{
unw_cursor_t cursor;
unw_context_t uc;
if (unw_getcontext(&uc) < 0)
return 0;
if (unw_init_local(&cursor, &uc))
return 0;
while (1)
if (unw_step (&cursor) <= 0)
return 1;
return 0;
}
int main(int argc, char **argv)
{
traverse_callstack ();
}
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