I want to know where the context was saved when a secure function was called in a non-secure interrupt function.
As shown in the figure, when a secure NSC function is called in a non-secure SVC interrupt service function,
the PUSH {R4-R6, LR} operation is executed. At this time, CONTROL_S==0x03, that is, the Thread/PSP state.
But the PSP_S=0X00000000, I want to know where the {R4-R6, LR} registers are pushed into?
By the way: the result of the program is normal.
Thank you!
Hi Uma
I want you to help me confirm a problem:
When the NSC function is called in a non-secure SVC interrupt function, and the CPU switches from a non-secure state to secure state. Is the CPU still in Handler mode?
Thanks a lot.
Best Regards
Yang
Hi Yang,
Sorry, I missed this question earlier.
Yes. The CPU is expected to be in Handler mode only (assuming that there no asynchronous interrupt between the state transitions)
Thanks,
Uma
Thank you very much.