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Architectures and Processors forum Of exceptions and aborts..

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Of exceptions and aborts..

Felix Varghese over 12 years ago

Note: This was originally posted on 21st January 2009 at http://forums.arm.com

The ARM reference manual specifies sometimes MOV PC,R14 and sometimes SUBS PC,R14, #4 for returning from exceptions. But they have not mentioned why. Can somebdy expain?
Also, when exactly does the PC get incremented? During the Fetch ?
And exactly when (Fetching / Decoding / Executing) does an exception get generated?
Does an undefined instruction get generated when the instruction is decoded or when it is executed?
What about Data and Prefetch aborts?

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Felix Varghese over 12 years ago +1 verified

Note: This was originally posted on 10th February 2009 at http://forums.arm.com The core is ARM7TDMI. Yes, they've given the return instruction for each exception. I was just looking for an explanation...