Illegal mode change handling
作者： Richard Roy Grisenthwaite
DOI:
关键词:
摘要: A data processing system (2) supporting multiple modes of operation is provided with illegal change detecting circuitry (22) which detects attempts by program instructions to perform an mode, e.g. such as a higher level privilege in response execution mode changing instruction or exception return instruction. If detected, then bit CPSR.IL set. An decoder (12) responsive the having set value treat subsequent undefined instructions. These may trigger other type response.
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