| 摘要 |
Processing circuitry has a plurality of exception states for handling exception events, the exception states including a base level exception state and at least one further level exception state. Each exception state has a corresponding stack pointer indicating the location within the memory of a corresponding stack data store. When the processing circuitry is in the base level exception state, stack pointer selection circuitry selects the base level stack pointer as a current stack pointer indicating a current stack data store for use by the processing circuitry. When the processing circuitry is a further exception state, the stack pointer selection circuitry selects either the base level stack pointer or the further level stack pointer corresponding to the current further level exception state as a current stack pointer. |
