• State Accepted Answer
  • Locked Locked
  • Replies 3 replies
  • Subscribers 348 subscribers
  • Views 4125 views
  • Users 0 members are here
Options
Related
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

For Armv8-M, is there a system register indicating the security state of the core?

Tao Lu

Arm® TrustZone Technology for the Armv8-M Architecture mentioned:

In a simplified view, the program address determines the security state of the processor, which can be either Secure or Non-secure.
• If the processor is running program code in Non-secure memory, the processor is in Non-secure state.
• If the processor is running program code in Secure memory, the processor is in Secure state.
• If the processor is in Secure state, it must fetch instructions from Secure memory.

Is there a system register indicating the security state of the core?

Parents
  • +1

    For privileged software to determine if it is in Secure state - Just use the Non-secure alias of CPUID:

    Secure software can access the Non-secure version of this register via CPUID_NS located at 0xE002ED00.
    The location 0xE002ED00 is RES0 to software executing in Non-secure state and the debugger.

Reply
  • +1

    For privileged software to determine if it is in Secure state - Just use the Non-secure alias of CPUID:

    Secure software can access the Non-secure version of this register via CPUID_NS located at 0xE002ED00.
    The location 0xE002ED00 is RES0 to software executing in Non-secure state and the debugger.

Children