sa_be32toh
un.words[BE64_HI] = sa_be32toh(un.words[BE64_HI]);
un.words[BE64_LO] = sa_be32toh(un.words[BE64_LO]);
uint32_t sa_be32toh(uint32_t);
f = (bo == ELFDATA2LSB) ? sa_le32toh(f) : sa_be32toh(f)