:orphan:

.. title:: CONFIG_NULL_POINTER_EXCEPTION_DETECTION_DWT

.. kconfig:: CONFIG_NULL_POINTER_EXCEPTION_DETECTION_DWT

CONFIG_NULL_POINTER_EXCEPTION_DETECTION_DWT
###########################################

*Use DWT for null pointer exception detection*

Type: ``bool``

Help
====

.. code-block:: none

    Null pointer dereference detection implemented
    using the DWT unit functionality.
    Notes:
    - Not enabled for Non-Secure FW images, where
    null-pointer dereferencing is likely caught as
    a SecureFault.
    - Requires DWT functionality in the Cortex-M SoC
    implementation (1 comparator for ARMv7-M, 2 comparators
    for ARMv8-M).
    - Requires the Cortex-M core be in normal mode.

Direct dependencies
===================

\ :kconfig:`CPU_CORTEX_M_HAS_DWT <CONFIG_CPU_CORTEX_M_HAS_DWT>` && !\ :kconfig:`TRUSTED_EXECUTION_NONSECURE <CONFIG_TRUSTED_EXECUTION_NONSECURE>` && \ :ref:`<choice NULL_POINTER_EXCEPTION_DETECTION: Enable and use null-pointer exception> <choice_17>`

*(Includes any dependencies from ifs and menus.)*

Symbols selected by this symbol
===============================

- \ :kconfig:`CORTEX_M_DWT <CONFIG_CORTEX_M_DWT>`
- \ :kconfig:`CORTEX_M_NULL_POINTER_EXCEPTION <CONFIG_CORTEX_M_NULL_POINTER_EXCEPTION>`

Kconfig definition
==================



At ``<Zephyr Architecture>/arm/core/aarch32/cortex_m/Kconfig:366``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:39`` → ``<Zephyr Architecture>/Kconfig:12`` → ``<Zephyr Architecture>/arm/Kconfig:57`` → ``<Zephyr Architecture>/arm/core/aarch32/Kconfig:294``

Menu path: (Top) → ARM Options → Enable and use null-pointer exception

.. code-block:: kconfig

    config NULL_POINTER_EXCEPTION_DETECTION_DWT
    	bool "Use DWT for null pointer exception detection"
    	select CORTEX_M_DWT
    	select CORTEX_M_NULL_POINTER_EXCEPTION
    	depends on CPU_CORTEX_M_HAS_DWT && !TRUSTED_EXECUTION_NONSECURE && <choice NULL_POINTER_EXCEPTION_DETECTION>
    	help
    	  Null pointer dereference detection implemented
    	  using the DWT unit functionality.
    	  Notes:
    	  - Not enabled for Non-Secure FW images, where
    	  null-pointer dereferencing is likely caught as
    	  a SecureFault.
    	  - Requires DWT functionality in the Cortex-M SoC
    	  implementation (1 comparator for ARMv7-M, 2 comparators
    	  for ARMv8-M).
    	  - Requires the Cortex-M core be in normal mode.

*(The 'depends on' condition includes propagated dependencies from ifs and menus.)*