FRM_R_CTL
FRM_R_CTL(x_f), \
uint8_t rctl = FRM_R_CTL(frm);
r_ctl = FRM_R_CTL(frm);
FRM2IFM(frm)->ifm_rctl = FRM_R_CTL(frm);
(x_fhdr)->r_ctl = FRM_R_CTL(x_frm); \
switch (FRM_R_CTL(frm)) {