kr_overflow
.kr_overflow = { data, lhs, rhs, '+' },
.kr_overflow = { data, lhs, rhs, '/' },
.kr_overflow = { data, lhs, rhs, '*' },
.kr_overflow = { data, lhs, rhs, '-' },
kr->kr_overflow.v_data;
kr->kr_overflow.v_lhs, blhs, sizeof(blhs));
kr->kr_overflow.v_rhs, brhs, sizeof(brhs));
blhs, kr->kr_overflow.v_op, brhs,