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Will a BLXNS into a location which is marked as secure, end up in the non-secure state, or will there be an exception?

Ed Player

This question was raised in the 'How to implement a secure IoT system on ARMv8-M' webinar, view all the questions in the round up blog post. 

  • +1
    Rule RWKXR from the section titled: "Security state transitions" from the ARMv8-M Architecture Reference Manual provides an answer to this question:

    "On transition from Secure to Non-secure state, if the least significant bit of an interstating branch is set to one the execution of the next instruction will generate a fault."