FP_C_TO_OPENBSD_MASK
disables = FP_C_TO_OPENBSD_FLAG(fp_c) & ~FP_C_TO_OPENBSD_MASK(fp_c);
needsig = changed_flags & FP_C_TO_OPENBSD_MASK(md_flags);
*retval = FP_C_TO_OPENBSD_MASK(md_flags);
*retval = FP_C_TO_OPENBSD_MASK(p->p_md.md_flags);