Abstract: Processing circuitry may support a secure domain and a less secure domain, where secure information associated with a secure software process is prevented from being accessed by a less secure software process in the less secure domain. Shared resource is accessible to both secure and less secure software processes. In response to detection of an anomaly condition, allocation policy for the shared resource is switched from a shared allocation policy to a secure-biased allocation policy. The secure-biased allocation policy has a stronger bias of resource allocation to secure software processes than the shared allocation policy.

Abstract: Circuitry comprises processing circuitry to process program instructions, in which the program instructions are stored by storage circuitry and the processing circuitry comprises execute-in-place processing circuitry configured to execute the program instructions from the storage circuitry; a prefetch buffer to store program instructions for execution by the processing circuitry; prefetch circuitry to control prefetching of program instructions to the prefetch buffer and to select a next instruction for prefetching; and replacement circuitry to control deletion of instructions from the prefetch buffer to provide storage for newly prefetched program instructions; in which one or both of the prefetch circuitry and the replacement circuitry are configured so that one or both of a selection operation by the prefetch circuitry of a next program instruction for prefetching, and a deletion operation to delete an instruction from the prefetch buffer by the replacement circuitry is dependent upon previously executed p