octboot_read
error = octboot_read(kargs, &eh, sizeof(eh), 0);
error = octboot_read(kargs, ph, phsize, eh.e_phoff);
error = octboot_read(kargs, sh, shsize, eh.e_shoff);
error = octboot_read(kargs, (caddr_t)ph[i].p_paddr,
error = octboot_read(kargs, shstr, shstrsize,
error = octboot_read(kargs,
int octboot_read(struct octboot_kexec_args *, void *, size_t, off_t);