1. A method of supporting virtualisation of a virtual data processing apparatus with a host data processing apparatus, said method comprising the steps of: executing a stream of program instructions with said host data processing apparatus to emulate processing by said virtual data processing apparatus; detecting with detection circuitry an attempted execution of a memory accessing instruction seeking to perform a memory access operation upon a memory address corresponding to a memory mapped device of said virtual data processing apparatus; writing with memory-abort circuitry to a memory-abort register memory-abort data characterising said memory access operation, said memory-abort data including data indicative of one or more registers accessed with said memory access operation; and triggering a memory-abort exception by execution of memory-abort handling program instructions by said host data processing apparatus to: (i) read said memory-abort data from said memory-abort register; (ii) emulate said memory access operation using said memory-abort data including said data indicative of one or more registers accessed with said memory access operation; and (iii) return to execution of said stream of program instructions.