:orphan:

.. title:: CONFIG_STACK_ALIGN_DOUBLE_WORD

.. kconfig:: CONFIG_STACK_ALIGN_DOUBLE_WORD

CONFIG_STACK_ALIGN_DOUBLE_WORD
##############################

*Align stacks on double-words (8 octets)*

Type: ``bool``

Help
====

.. code-block:: none

    This is needed to conform to AAPCS, the procedure call standard for
    the ARM. It wastes stack space. The option also enforces alignment
    of stack upon exception entry on Cortex-M3 and Cortex-M4 (ARMv7-M).
    Note that for ARMv6-M, ARMv8-M, and Cortex-M7 MCUs stack alignment
    on exception entry is enabled by default and it is not configurable.

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

\ :kconfig:`ARM <CONFIG_ARM>`

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

Default
=======

- y

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



At ``<Zephyr Architecture>/arm/core/aarch32/Kconfig:115``

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

Menu path: (Top) → ARM Options

.. code-block:: kconfig

    config STACK_ALIGN_DOUBLE_WORD
    	bool "Align stacks on double-words (8 octets)"
    	default y
    	depends on ARM
    	help
    	  This is needed to conform to AAPCS, the procedure call standard for
    	  the ARM. It wastes stack space. The option also enforces alignment
    	  of stack upon exception entry on Cortex-M3 and Cortex-M4 (ARMv7-M).
    	  Note that for ARMv6-M, ARMv8-M, and Cortex-M7 MCUs stack alignment
    	  on exception entry is enabled by default and it is not configurable.

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