vread_helper
static int vread_helper(mdb_ctf_id_t, char *, mdb_ctf_id_t, char *,
return (vread_helper(modmid, modbuf + modoff / NBBY,
ret = vread_helper(mar.mta_contents, modbuf + i * modsz,
ret = vread_helper(modid, modbuf, tgtid, tgtbuf, NULL, flags);