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Exception handlers and interrupt

RCReddy

Hi All,

        i went through this link

http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0471g/BABGCFHB.html

and related a53 vector table implementation.

in this regard, i have a question

1. Say a processor gets stuck in exception handler due to one of the exceptions, would it still respond to hardware interrupts?

   in other words, say a processor is in exception handler function and it gets an UART interrupt, will the UART ISR gets invoked and be able to service the request.

so the reason i am asking this question is to recover a board which is landing into exception handler and send all its REGISTERS/STATE information via UART directed to console.

Thanks

Parents
  • 0 in reply to RCReddy

    Hi, in your exception handler (say, Data abort exception handler), i think, it should be perfectly fine to read or write to the UART registers. You don't need to invoke the UART ISR. I also don't think that ISRs are designed to be invoked. You typically register them instead and they are supposed to get invoked automatically, 

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  • 0 in reply to RCReddy

    Hi, in your exception handler (say, Data abort exception handler), i think, it should be perfectly fine to read or write to the UART registers. You don't need to invoke the UART ISR. I also don't think that ISRs are designed to be invoked. You typically register them instead and they are supposed to get invoked automatically, 

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