:orphan:

.. title:: choice NULL_POINTER_EXCEPTION_DETECTION: Enable and use null-pointer exception

.. _choice_17:

.. describe:: choice NULL_POINTER_EXCEPTION_DETECTION: Enable and use null-pointer exception

*Enable and use null-pointer exception*

Type: ``bool``

Help
====

.. code-block:: none

    There are 2 implementations available, one based
    on DWT and the other based on MPU. Use this choice
    symbol to select one of the options. By default the
    feature is disabled. In the test suite the feature
    is enabled and the DWT-based solution is preferred.

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

\ :kconfig:`BOARD_MPS2_AN521_CPU0 <CONFIG_BOARD_MPS2_AN521_CPU0>` || \ :kconfig:`BOARD_MPS2_AN521_CPU0_NS <CONFIG_BOARD_MPS2_AN521_CPU0_NS>` || \ :kconfig:`BOARD_MPS2_AN521_CPU1 <CONFIG_BOARD_MPS2_AN521_CPU1>` || \ :kconfig:`BOARD_MPS3_AN547 <CONFIG_BOARD_MPS3_AN547>` || \ :kconfig:`BOARD_QEMU_CORTEX_M3 <CONFIG_BOARD_QEMU_CORTEX_M3>` || \ :kconfig:`SOC_FAMILY_NRF <CONFIG_SOC_FAMILY_NRF>` || \ :kconfig:`SOC_FAMILY_NRF <CONFIG_SOC_FAMILY_NRF>` || (\ :kconfig:`CPU_CORTEX_M <CONFIG_CPU_CORTEX_M>` && \ :kconfig:`ARM <CONFIG_ARM>`)

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

Defaults
========

- \ :kconfig:`NULL_POINTER_EXCEPTION_DETECTION_NONE <CONFIG_NULL_POINTER_EXCEPTION_DETECTION_NONE>` if \ :kconfig:`QEMU_TARGET <CONFIG_QEMU_TARGET>`
- \ :kconfig:`NULL_POINTER_EXCEPTION_DETECTION_NONE <CONFIG_NULL_POINTER_EXCEPTION_DETECTION_NONE>` if \ :kconfig:`QEMU_TARGET <CONFIG_QEMU_TARGET>`
- \ :kconfig:`NULL_POINTER_EXCEPTION_DETECTION_NONE <CONFIG_NULL_POINTER_EXCEPTION_DETECTION_NONE>`
- \ :kconfig:`NULL_POINTER_EXCEPTION_DETECTION_DWT <CONFIG_NULL_POINTER_EXCEPTION_DETECTION_DWT>` if \ :kconfig:`TEST_ARM_CORTEX_M <CONFIG_TEST_ARM_CORTEX_M>` && !\ :kconfig:`ARM_NONSECURE_FIRMWARE <CONFIG_ARM_NONSECURE_FIRMWARE>` && \ :kconfig:`CPU_CORTEX_M_HAS_DWT <CONFIG_CPU_CORTEX_M_HAS_DWT>`
- \ :kconfig:`NULL_POINTER_EXCEPTION_DETECTION_DWT <CONFIG_NULL_POINTER_EXCEPTION_DETECTION_DWT>` if \ :kconfig:`TEST_ARM_CORTEX_M <CONFIG_TEST_ARM_CORTEX_M>` && !\ :kconfig:`ARM_NONSECURE_FIRMWARE <CONFIG_ARM_NONSECURE_FIRMWARE>` && \ :kconfig:`CPU_CORTEX_M_HAS_DWT <CONFIG_CPU_CORTEX_M_HAS_DWT>`
- \ :kconfig:`NULL_POINTER_EXCEPTION_DETECTION_MPU <CONFIG_NULL_POINTER_EXCEPTION_DETECTION_MPU>` if \ :kconfig:`TEST_ARM_CORTEX_M <CONFIG_TEST_ARM_CORTEX_M>` && !\ :kconfig:`ARM_NONSECURE_FIRMWARE <CONFIG_ARM_NONSECURE_FIRMWARE>` && \ :kconfig:`ARM_MPU <CONFIG_ARM_MPU>` && !\ :kconfig:`CPU_CORTEX_M_HAS_DWT <CONFIG_CPU_CORTEX_M_HAS_DWT>`
- \ :kconfig:`NULL_POINTER_EXCEPTION_DETECTION_NONE <CONFIG_NULL_POINTER_EXCEPTION_DETECTION_NONE>`

Choice options
==============

- \ :kconfig:`NULL_POINTER_EXCEPTION_DETECTION_NONE <CONFIG_NULL_POINTER_EXCEPTION_DETECTION_NONE>`
- \ :kconfig:`NULL_POINTER_EXCEPTION_DETECTION_DWT <CONFIG_NULL_POINTER_EXCEPTION_DETECTION_DWT>`
- \ :kconfig:`NULL_POINTER_EXCEPTION_DETECTION_MPU <CONFIG_NULL_POINTER_EXCEPTION_DETECTION_MPU>`

Kconfig definitions
===================



At ``<Zephyr Boards>/arm/mps2_an521/Kconfig.defconfig:9``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:22``

Menu path: (Top)

.. code-block:: kconfig

    choice NULL_POINTER_EXCEPTION_DETECTION
    	bool
    	default NULL_POINTER_EXCEPTION_DETECTION_NONE if QEMU_TARGET
    	depends on BOARD_MPS2_AN521_CPU0 || BOARD_MPS2_AN521_CPU0_NS || BOARD_MPS2_AN521_CPU1

----

At ``<Zephyr Boards>/arm/mps3_an547/Kconfig.defconfig:12``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:22``

Menu path: (Top)

.. code-block:: kconfig

    choice NULL_POINTER_EXCEPTION_DETECTION
    	bool
    	default NULL_POINTER_EXCEPTION_DETECTION_NONE if QEMU_TARGET
    	depends on BOARD_MPS3_AN547

----

At ``<Zephyr Boards>/arm/qemu_cortex_m3/Kconfig.defconfig:16``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:22``

Menu path: (Top)

.. code-block:: kconfig

    choice NULL_POINTER_EXCEPTION_DETECTION
    	bool
    	default NULL_POINTER_EXCEPTION_DETECTION_NONE
    	depends on BOARD_QEMU_CORTEX_M3

----

At ``<Zephyr SoC>/arm/nordic_nrf/Kconfig.defconfig:45``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:25`` → ``<BuildDir>/kconfig/Kconfig.soc.defconfig:1``

Menu path: (Top)

.. code-block:: kconfig

    choice NULL_POINTER_EXCEPTION_DETECTION
    	bool
    	default NULL_POINTER_EXCEPTION_DETECTION_DWT if TEST_ARM_CORTEX_M && !ARM_NONSECURE_FIRMWARE && CPU_CORTEX_M_HAS_DWT
    	depends on SOC_FAMILY_NRF

----

At ``<Zephyr SoC>/arm/nordic_nrf/Kconfig.defconfig:45``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:27``

Menu path: (Top)

.. code-block:: kconfig

    choice NULL_POINTER_EXCEPTION_DETECTION
    	bool
    	default NULL_POINTER_EXCEPTION_DETECTION_DWT if TEST_ARM_CORTEX_M && !ARM_NONSECURE_FIRMWARE && CPU_CORTEX_M_HAS_DWT
    	depends on SOC_FAMILY_NRF

----

At ``<Zephyr Architecture>/arm/core/aarch32/cortex_m/Kconfig:347``

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

.. code-block:: kconfig

    choice NULL_POINTER_EXCEPTION_DETECTION
    	bool "Enable and use null-pointer exception"
    	default NULL_POINTER_EXCEPTION_DETECTION_MPU if TEST_ARM_CORTEX_M && !ARM_NONSECURE_FIRMWARE && ARM_MPU && !CPU_CORTEX_M_HAS_DWT
    	default NULL_POINTER_EXCEPTION_DETECTION_NONE
    	depends on CPU_CORTEX_M && ARM
    	help
    	  There are 2 implementations available, one based
    	  on DWT and the other based on MPU. Use this choice
    	  symbol to select one of the options. By default the
    	  feature is disabled. In the test suite the feature
    	  is enabled and the DWT-based solution is preferred.

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