function::registers_valid - Linux

Overview

function::registers_valid is a powerful command that helps ensure the validity of CPU registers in Linux systems. It verifies that register values are not corrupted and match the expected state for the current system context. This command is particularly useful in debugging kernel and driver issues.

Syntax

function::registers_valid [[-a] [-d] | [-s | -v] <reason>]

Options/Flags

  • -a: Display all registers and their values.
  • -d: Only display registers that differ from their expected values.
  • -s: Show register values for a specific reason (e.g., entering/exiting interrupt).
  • -v: Print additional details about register values.
  • <reason>: Specify a specific reason to check register values. Use --help for a list of reasons.

Examples

  • Check all register values:
function::registers_valid -a
  • Show only different register values:
function::registers_valid -d
  • Display register values on interrupt entry:
function::registers_valid -s irq_enter
  • Print detailed register values and reasons for "schedule":
function::registers_valid -v -s schedule

Common Issues

  • Command not found: Ensure that the function::registers_valid is installed and in your PATH.
  • Invalid reason: Specify a valid reason when using the -s flag. Refer to --help for the list of reasons.
  • Kernel version mismatch: The command may not work correctly with older kernel versions. Update to the latest stable kernel version if possible.

Integration

function::registers_valid can be integrated into kernel debugging scripts or as part of a custom kernel validation framework. It can also be used to verify register states before and after running specific test cases.

Related Commands

  • registers: Print register values in a more condensed format.
  • kdb: Enter the kernel debugger for advanced debugging.
  • dmesg: Display kernel messages, including register errors.