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Add configUSE_TASK_FPU_SUPPORT to AARCH64 port (#1048)

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* Add configUSE_TASK_FPU_SUPPORT to AARCH64 port

NEON SIMD is required by standard AARCH64 and its registers are
frequently utilized by standard functions such as memcpy().
This means that even simple tasks that do not use any floating point
arithmetics may still alter the contents of the FPU registers.

For this reason it makes sense to add support for
configUSE_TASK_FPU_SUPPORT to be able to enforce FPU register saving and
restoring globally.

The implementation was largely adopted from the ARM_CA9 port. However,
the FPU registers must be placed on the stack before the critical
nesting count to match the AARCH64 portASM.S.
This commit is contained in:
StefanBalt 2024-05-08 13:37:52 +02:00 • committed by GitHub
parent 067d04e44e
commit 55eceb2203
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2 changed files with 63 additions and 22 deletions
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15
portable/GCC/ARM_AARCH64/portmacro.h
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@ -135,9 +135,18 @@ extern void vPortInstallFreeRTOSVectorTable( void );
* handler for whichever peripheral is used to generate the RTOS tick. */
void FreeRTOS_Tick_Handler( void );
/* Any task that uses the floating point unit MUST call vPortTaskUsesFPU()
* before any floating point instructions are executed. */
void vPortTaskUsesFPU( void );
/* If configUSE_TASK_FPU_SUPPORT is set to 1 (or left undefined) then tasks are
* created without an FPU context and must call vPortTaskUsesFPU() to give
* themselves an FPU context before using any FPU instructions. If
* configUSE_TASK_FPU_SUPPORT is set to 2 then all tasks will have an FPU context
* by default. */
#if ( configUSE_TASK_FPU_SUPPORT != 2 )
void vPortTaskUsesFPU( void );
#else
/* Each task has an FPU context already, so define this function away to
* nothing to prevent it from being called accidentally. */
#define vPortTaskUsesFPU()
#endif
#define portTASK_USES_FLOATING_POINT() vPortTaskUsesFPU()
#define portLOWEST_INTERRUPT_PRIORITY ( ( ( uint32_t ) configUNIQUE_INTERRUPT_PRIORITIES ) - 1UL )