I turned The Metasploit Project's Polymorphic XOR Encoder, "Shikata Ga Nai" ("there is no other way") into my own encoder that works on emulated x86/64 for ARM called "Fukahi Tekiō" (不可避適応 or "inevitable adaptation" describing the CALL/POP technique to fix broken FPU fnstenv GetPC trick in Windows emulation in a shellcode context).