unw_get_reg(&c, UNW_X86_64_RIP, &rip);
unw_get_reg(&c, UNW_X86_64_RSP, &rsp);
fprintf(file, " %i: %s (RIP=0x%" PRIx64 " RSP=0x%" PRIx64 ")\n",
unw_get_reg(&c, UNW_X86_64_RIP, &rip);
unw_get_reg(&c, UNW_X86_64_RSP, &rsp);
fprintf(file, " %i: %s (RIP=0x%" PRIx64 " RSP=0x%" PRIx64 ")\n",