PC of ARM Cortex M9 non-intrusively using JTAG bitbang

Open source ARM Debugger

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ananya.muddu
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Joined: Tue Sep 05, 2017 6:55 am

PC of ARM Cortex M9 non-intrusively using JTAG bitbang

Post by ananya.muddu » Tue Sep 05, 2017 7:06 am

Hi,

I am studying OpenOCD source code to understand how one can sample the PC (program counter) of Cortex A9 non-intrusively (processor does not halt) by bitbanging the JTAG port from a microcontroller. There is no dedicated external debugger device (such as the Segger J-link) in the loop. The microcontroller bitbangs directly to the DAP inside the Cortex A9.

I need help from OpenOCD users and developers to understand if:
- it is feasible to sample the Cortex A9 PC non-intrusively using bitbanging
- there are any source code examples in OpenOCD that can guide me

Best regards,
Ananya

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