The GDB Stub


The simplest approach is using a GDB stub
It can use TCP or UDP or a serial port
You find a working one in the hsw2020 repository
It costed 4 hours studying and 6 hours coding.

You need a way to interrupt your processor
So your channel must be interrupt-driven (I used UART)
You need to save all of your status (we do not, currently)
We do not need all registers for scheduling, so we don't save them

And you need a way to read and write memory
The debugger examines code and data (code is read-only)