June 2017
Intermediate to advanced
478 pages
13h 14m
English
Content preview from Mastering Embedded Linux Programming - Second Edition
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Debugging kernel code with kdb
Although kdb does not have the features of kgdb and GDB, it does have its uses, and being self-hosted, there are no external dependencies to worry about. kdb has a simple command-line interface that you can use on a serial console. You can use it to inspect memory, registers, process lists, and dmesg and even set breakpoints to stop at a certain location.
To configure your kernel so that you can call kdb via a serial console, enable kgdb as shown previously, and then enable this additional option:
- CONFIG_KGDB_KDB, which is in the menu KGDB: Kernel hacking | kernel debugger | KGDB_KDB: Include kdb frontend for kgdb
Now, when you force the kernel into a trap, instead of entering into a GDB session, you will ...
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