mbackchainand-mno-backchain: Theseoptionscontrolwhether the addressof the caller's frame is storedas so-called "backchain" pointerinto the callee'sstack frame.
It was designed as a graduated double row of rectangular-cut emeralds, extending a pear and circular-cut diamond fringe, joined by circular and pear-shaped diamond clusters to the circular-cut diamond double row backchain, mounted on platinum.