How to place FreeRTOS in secure memory and the user tasks in non-secure memory?

I am porting FreeRTOS with TrustZone on LPC5500, I put FreeRTOS in secure memory, and created several user tasks in non-secure memory, as shown below:

But so far, I have not successfully switched from a secure task to a non-secure task.

How to switch from a secure task to a non-secure task?

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