ARM Cortex M3 How do I determine the program counter value before a hard fault?

Question

I have an embedded project using a STM32F103 (ARM Cortex M3), it is getting a occasionally getting hard fault in release mode. As part of recovery, I would like to retrieve

Answer 1

When an exception occurs, the processor state change from the current state to the abort state. In the abort state the processor shifts to use a new set of registers for sp and lr (sp_abt and sp_lr respectively. For a data abort, the offending instruction can be found in lr_abt + 8 for an prefect about in lr_abt + 4 (as per the ARMv7 Architecure reference manual)