Can you explain the lyrics “His whole back's to these ropes, it don't matter, he's dope” in the song lose yourself by Eminem?

“Back’s to these ropes” is another way of saying that Rabbit, the main character of the song, is in a difficult situation; his back is against the wall. Eminem is comparing the rap battle that Rabbit takes part in at the end of 8 Mile to the sport of boxing, where the ring is surrounded by ropes.