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ARM9 SVC_STACK out of range?

I am debugging some odd ARM exceptions in the embedded system using the Workbench IAR toolchain. Sometimes, when an exception falls into the trap, SVC_STACK is reported as out of range (very far from the range!) Is it relevant or just an artifact of the J-Link JTAG debugger? What is SVC_STACK used for? It is set to 0x1000, but when it is out of range, it is in our heap area. Thanks!

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ARM SVM mode is introduced when an exception occurs (not IRQ or FIQ - fast IRQ). It can also be entered directly with non-user code by setting the CPRS register, but I think this is unusual, except when initializing the system.

When an exception occurs, the processor switches to the SVC stack, which must be installed very early during system initialization. I assume that your initialization code incorrectly configures the SVC stack, or it is possible that one of the exception handlers is incorrectly encoded and destroys the stack.

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Source: https://habr.com/ru/post/1716370/

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