UNW_PC
address = UNW_PC(&frame_info);
&& !__get_user(UNW_PC(frame),
sizeof(UNW_PC(frame));
unsigned long pc = UNW_PC(frame) - frame->call_frame;
UNW_PC(frame), UNW_BLINK(frame), UNW_SP(frame),
if (UNW_PC(frame) == 0)