l09dm0zgus/myfirstawesomekernelmodule

My First Awesome Kernel Module

Simple kernel module for embedded Linux distros based on Poky.

Tested on Yocto 4.2 (mickledore) with kernel version : 6.1.38-yocto-standard

Installing

1. Install Yocto. You can read how to install here .

2. Clone this repo.

3. cp MyFirstAwesomeKernelModule <poky directory>

4. source oe-init-bulid-env

5. Add layer

   bitbake-layers add-layer ../MyFirstAwesomeKernelModule/

6. Add to end of your local.conf IMAGE_INSTALL:append = " awesome-mod"

7. Build image with bitbake <image name>

Usage

1. Install module with

   su
   insmod /lib/modules/$(uname -r)/extra/awesome_module.ko address=<breakpoint address>

2. For change breakpoint address

   su
   echo <address> > /sys/kernel/address/address 

   For read

   cat /sys/kernel/address/address

Used materials

https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/Incorporating-Out-of-Tree-Modules-in-YOCTO/ta-p/1373825

https://martin.uy/blog/hardware-breakpoints-in-the-linux-kernel-through-perf_events/

https://stackoverflow.com/questions/19725900/watch-a-variable-memory-address-change-in-linux-kernel-and-print-stack-trace

https://embetronicx.com/tutorials/linux/device-drivers/sysfs-in-linux-kernel/

https://devarea.com/linux-kernel-development-kernel-module-parameters/