Steps for getting LLDB working inside the CHERIoT devcontainer

[yeshsgit]

Hello,

I saw in discussion #197 that LLDB support is now available for CHERIoT. I’d like to get this working inside the CHERIoT devcontainer, but I haven’t been able to find step-by-step setup instructions.

Could someone outline the steps (or point me to any documentation in progress) for:

• Setting up LLDB inside the devcontainer

• Attaching it to a running CHERIoT program (simulation or hardware)

• Any configuration files or scripts needed

Thanks!

[resistor]

Thanks for the interest in it!

Unfortunately, there are a few hurdles to using the CHERIoT-customized debugger setup today:

• AFAIK we're not currently bundling lldb in the devcontainer, though that will plausibly change in the future once the second issue resolved.
• The larger bigger issue, assuming you're using Sonata, is that the version of the debug module currently in the Sonata gateware is out of sync with what is in Iceni. (See Allow aarsize==3 (aka 64-bit) Abstract Commands in the debug module. lowRISC/sonata-system#431 ). Until that is resolved, the customized debugger setup won't work properly with Sonata.

The good news is that you should be able to use OpenOCD + vanilla GDB or LLDB to debug Sonata "as if" it were a normal RV32E system. Most things should just work, but don't be surprised if there are glitches. There is some basic documentation for using it in this way here: https://lowrisc.github.io/sonata-system/doc/ip/dm.html

[davidchisnall]

In addition, the MPact simulator in the dev container has an integrated debugger, which may be more useful for debugging in simulation.