stack overflow and STACK GUARD

Question

I am using nrf52832 SDK14.2 development, now the system will generate some strange exceptions, I am worried about the stack overflow, is there any way to confirm whether the stack overflows, where does the stack overflow?
In addition, I saw the STACK GUARD library. What is the role of this library? I only saw the initialization function, did not see the exception reminder and other processing functions, it can help me confirm whether the stack overflows and overflows?

Tony Garland · Answer

wpaul wrote: 
 If it were me, instead of using RO/RO (0x7) as the protection attributes, I would use NA/NA (0x0). This will trap both reads and writes. Reading past the end of the stack could also be a sign of a bug that is best fixed. I have found that you can get away with doing this even when setting a protection region at address 0x0. When I first tried this I was concerned it might have some impact on exception handling (since the exception vector table is also at address 0x0), but while reads and writes are successfully trapped, exception handling seems unaffected. 
 I tried setting the MPU with a region at location zero with both read and write access disabled (0x0 for AP field). My experiments show that it still allows reads--only disables writes. So I'm unable to detect reads of NULL pointers. Have you been able to get it to trigger on reads from zero as well? 
 - Tony

stack overflow and STACK GUARD

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