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The reason why the exception frame forms on PSP?

Yasuhiko Koumoto

Hello experts,


I would like to ask the reason why the exception frame forms on PSP in the Cortex-M architecture.
My understanding is that MSP (Main Stack Pointer) is the interrupt stack pointer and PSP (Porcess Stack Pointer) is the normal (user) stack pointer.
From my little experiences, the exception frame was formed on the interrupt stack.
However, the ARM forms it on the user stack.

Best regards,
Yasuhiko Kouoto.

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