What you'll learn:
- Debugging Linux Kernel Using KGDB
- KGDB on Raspberry Pi3
User space processes can be debugged using gdb. With gdb you can
single-step,
stop,
resume,
put break-points,
inspect memory and variables,
look through call stack information
What if we can use gdb on running Linux Kernel.
Problem:
How can a gdb debug running kernel as it is just a user space process.
Solution:
Client/Server Architecture
User space programs can be debugged remotely using the combination of gdbserver on the target machine and gdb on the host machine/development machine.
The Linux kernel has a GDB Server implementation called KGDB. It communicates with a GDB client over network or serial port connection
In this course we will learn:
How to setup KGDB
Various ways of getting the target into development machine
Setting Breakpoints
Printing and Setting Variables
Using a single serial port for both kgdb and console messages
Getting the kernel messages in gdb window
Debugging Linux Kernel Modules (In-Tree, out of tree)
Use of GDB Scripts present in the Linux Kernel
