• State Not Answered
  • Locked Locked
  • Replies 3 replies
  • Subscribers 351 subscribers
  • Views 9072 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

PendSV target secure state

Jiameng

Hi,

As we know, PendSV can be used for context switching, for example in RTOS and software in non-secure state typicall trigger the non-secure PendSV handler.

However, whether we can make the RTOS triggers the secure PendSV handler to process some logics regarding to security purposes and then return to non-secure PendSV handler to process the normal context switching?

Thanks. 

Parents
  • 0

    Hi Jiameng,

    As per Armv8-M architecture, PendSV exception is banked between security states.

    A secure software can program AIRCR.PRIS bit such that non-secure exceptions are forcibly made to have lower priority than the lowest priority secure exception. Hence a secure exception always gets triggered before non-secure exception when pended.

    Thanks,

    Uma

Reply
  • 0

    Hi Jiameng,

    As per Armv8-M architecture, PendSV exception is banked between security states.

    A secure software can program AIRCR.PRIS bit such that non-secure exceptions are forcibly made to have lower priority than the lowest priority secure exception. Hence a secure exception always gets triggered before non-secure exception when pended.

    Thanks,

    Uma

Children
No data