grub_seek
grub_seek (i - (pu.mb->header_addr - cur_addr));
grub_seek (N_TXTOFF (*(pu.aout)));
grub_seek (data_len + SECTOR_SIZE);
grub_seek (phdr->p_offset);
grub_seek (pu.elf->e_shoff);
grub_seek (shdr[i].sh_offset);
grub_seek (SECTOR_SIZE);
grub_seek (SECTOR_SIZE);
grub_seek (0);
grub_seek (0);
int grub_seek (int offset);