With regard to slide 38 that talks about calling from secure code to non-secure code, can we assume that the registers pushed {r4-r11} cannot be viewed by examining the stack?

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 .
With regard to slide 38 that talks about calling from secure code to non-secure code, can we assume that the registers pushed {r4-r11} cannot be viewed by examining the stack?

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 .
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