:orphan:

.. title:: MPU_STACK_GUARD_MIN_SIZE_FLOAT

.. option:: CONFIG_MPU_STACK_GUARD_MIN_SIZE_FLOAT

*(No prompt -- not directly user assignable.)*

Type: ``int``

Help
====

Minimum size (and alignment when applicable) of an ARM MPU
region, which guards the stack of a thread that is using the
Floating Point (FP) context. The width of the guard is set to
128, to accommodate the length of a Cortex-M exception stack
frame when the floating point context is active. The FP context
is only stacked in sharing FP registers mode, therefore, the
option is applicable only when FPU_SHARING is selected.

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

\ :option:`MPU_STACK_GUARD <CONFIG_MPU_STACK_GUARD>` && \ :option:`FPU_SHARING <CONFIG_FPU_SHARING>` && \ :option:`ARM_MPU <CONFIG_ARM_MPU>` && \ :option:`CPU_HAS_MPU <CONFIG_CPU_HAS_MPU>` && \ :option:`CPU_CORTEX_M <CONFIG_CPU_CORTEX_M>` && !\ :option:`ARM64 <CONFIG_ARM64>` && \ :option:`ARM <CONFIG_ARM>`

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

Default
=======

- 128

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

.. highlight:: kconfig

At ``arch/arm/core/aarch32/cortex_m/mpu/Kconfig:64``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:29`` → ``arch/Kconfig:12`` → ``arch/arm/Kconfig:42`` → ``arch/arm/core/aarch32/Kconfig:237`` → ``arch/arm/core/aarch32/cortex_m/Kconfig:308``

Menu path: (Top) → ARM Options → Thread Stack Guards

.. parsed-literal::

    config MPU_STACK_GUARD_MIN_SIZE_FLOAT
    	int
    	default 128
    	depends on \ :option:`MPU_STACK_GUARD <CONFIG_MPU_STACK_GUARD>` && \ :option:`FPU_SHARING <CONFIG_FPU_SHARING>` && \ :option:`ARM_MPU <CONFIG_ARM_MPU>` && \ :option:`CPU_HAS_MPU <CONFIG_CPU_HAS_MPU>` && \ :option:`CPU_CORTEX_M <CONFIG_CPU_CORTEX_M>` && !\ :option:`ARM64 <CONFIG_ARM64>` && \ :option:`ARM <CONFIG_ARM>`
    	help
    	  Minimum size (and alignment when applicable) of an ARM MPU
    	  region, which guards the stack of a thread that is using the
    	  Floating Point (FP) context. The width of the guard is set to
    	  128, to accommodate the length of a Cortex-M exception stack
    	  frame when the floating point context is active. The FP context
    	  is only stacked in sharing FP registers mode, therefore, the
    	  option is applicable only when FPU_SHARING is selected.

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