Chapter 17. Debugging Tools

This chapter provides information about the available procedures for debugging a device driver which is under development. The procedures discussed include:

• Saving device driver information in a system dump.

• Using the crash command to interpret and format system structures.

• Using the LLDB Kernel Debugger to set breakpoints and display variables and registers.

• Using the KDB Kernel Debugger and Command to set breakpoints and display variables and registers.

• Error logging to record device-specific hardware or software abnormalities.

• Using the Debug and Performance Tracing to monitor entry and exit of device drivers and selectable system events.

• Using the Memory Overlay Detection System (MODS) to help detect memory overlay problems in the AIX kernel, kernel extensions, and device drivers.