You'll have to be a lot more specific than "ARM" - Most newer ARM systems are little endian in practical operation, and ARM has been "flexible endian" (you can

You'll have to be a lot more specific than "ARM" - Most newer ARM systems are little endian in practical operation, and ARM has been "flexible endian" (you can switch between big and little endian - SCTLR has the relevant bits to control the accesses on most recent ARM ISAs) for some long while now.