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1. 发明授权

US07797681B2 Stack memory selection upon exception in a data processing system 有权
标题翻译：在数据处理系统中的异常堆栈存储器选择
公开(公告)号：US07797681B2
公开(公告)日：2010-09-14
申请号：US11431926
申请日：2006-05-11
申请人： Richard Roy Grisenthwaite , Paul Kimelman , David James Seal , David Aaron Rusling
发明人： Richard Roy Grisenthwaite , Paul Kimelman , David James Seal , David Aaron Rusling
IPC分类号： G06F9/44
CPC分类号： G06F9/4812 , G06F9/3861 , G06F9/462
摘要： A data processor 2 has privilege levels associated with it including a user level and a privileged level. The processor 2 also has multiple stack memories which can be used including one or more process stacks, a main stack and a deep stack. The stack memory to be used is de-coupled from the privilege level. An activation level state variable tracking the number of pending exceptions is held by the processor and used to modify which stack memory stores pending state values when an exception occurs. If the system is at a base level of activation, corresponding to currently no pending exceptions, then when an exception occurs the current state data is saved on the process stack with the main stack being available for the exception handling code. Particular exceptions can be flagged as requiring use of a deep stack rather than either the process stack or the main stack. If the system is not at the base level of activation, then the main stack is used to save state variables when an exception occurs rather than the process stack.
摘要翻译：数据处理器2具有与其相关联的特权级别，其包括用户级别和特权级别。处理器2还具有可以使用的多个堆栈存储器，包括一个或多个处理堆栈，主堆栈和深堆栈。要使用的堆栈内存从特权级别去耦合。跟踪待处理异常的数量的激活级状态变量由处理器保存，并用于修改哪个堆栈存储器在发生异常时存储待处理的状态值。如果系统处于激活的基本级别，对应于当前没有挂起的异常，则当发生异常时，当前状态数据保存在进程堆栈中，主堆栈可用于异常处理代码。可以将特殊异常标记为需要使用深栈，而不是使用进程堆栈或主堆栈。如果系统不在激活的基本级别，则主堆栈用于在异常发生时保存状态变量而不是进程堆栈。

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