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Question: How to trap/route unallocated instruction exception to EL3 #702

Open caihuali95 opened 4 years ago

caihuali95 commented 4 years ago

I wonder whether it is possible to trap/route unallocated instruction exception to EL3? Unallocated instruction exception is a synchronous exception. But I failed to catch this exception in EL3 even if I set SCR_EL3.EA = 1.

If it is impossible to do that, is there any document explaining which synchronous exceptions can be trapped into EL3 while others can not?

ssg-bot commented 4 years ago

Hello @caihuali95!

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mcejp commented 1 year ago

@caihuali95 Out of curiosity, have you ever figured out how to trap EL1 synchronous exceptions to EL3? From my reading of the manuals there is no way to do it -- other than using EL3 superpowers to control the code in EL1's exception vectors. The SCR_EL3.EA bit seems to only concern SError (system error, not synchronous error) and External Abort.