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Armv8-M Hangs on Non-secure Interrupt Handler Exit

Mohsen Shaaban

Hello,

On exiting non-secure interrupt handler, armv8-M cm33 gets in a bad state and hangs.

I think what's happening is, on exiting non-secure handler, cpu try to restore state from a secure area, I see "sec_err_irq_mpc" fires right after non-secure irq is cleared at handler exit.

How to allow crossing from non-secure to secure state and prevent that security error from happening.

Any clue or help is highly appreciated.

Thanks,

Mohsen

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