If .eh_frame_hdr is present, then only the header needs to be parsed.
Otherwise, .eh_frame and .debug_frame are scanned and a sorted list of FDEs is built for binary searching during unwinding.
If .eh_frame_hdr is present, then only the header needs to be parsed.
Otherwise, .eh_frame and .debug_frame are scanned and a sorted list of FDEs is built for binary searching during unwinding.