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Load/store exception handler: handle re-entry via a NMI. #644

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Load/store exception handler: handle re-entry via a NMI. #644

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Commits on Jun 17, 2018

  1. Load/store exception handler: handle re-entry via a NMI. 

    The NMI can asynchronously interrupt the load/store exception handler. This
does occur frequently as the NMI handler code does invoke load/store
exceptions, and the load/store exception handler is heavly used. This was
corrupting the load/store exception handler saved state and thus randomly
corrupting registers a0 to a6 of the interruptee.
    @ourairquality
    ourairquality committed Jun 17, 2018
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