REGION IDENTIFYING OPERATION FOR IDENTIFYING A REGION OF A MEMORY ATTRIBUTE UNIT CORRESPONDING TO A TARGET MEMORY ADDRESS

A data processing apparatus has a memory attribute unit having storage regions for storing attribute data for controlling access to a corresponding memory address range by processing circuitry. In response to a target memory address, the processing circuitry can perform a region identifying operation to output a region identifying value identifying which of the storage regions of the attribute unit corresponds to the target memory address. The region identifying value is made available to at least some software executed by the data processing apparatus. This can be useful for quickly checking access permissions of a range of addresses or for determining how to update the memory attribute unit.