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Update the GCC Cortex-A9 port to introduce a version of the IRQ handler that saves the FPU registers.

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This commit is contained in:
Richard Barry 2016-04-23 10:53:57 +00:00
parent ac67c39be9
commit 345819d550
5 changed files with 78 additions and 5 deletions
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27
FreeRTOS/Source/portable/GCC/ARM_CA9/port.c
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@ -202,6 +202,27 @@ extern void vPortRestoreTaskContext( void );
*/
static void prvTaskExitError( void );
/*
* If the application provides an implementation of vApplicationIRQHandler(),
* then it will get called directly without saving the FPU registers on
* interrupt entry, and this weak implementation of
* vApplicationFPUSafeIRQHandler() is just provided to remove linkage errors -
* it should never actually get called so its implementation contains a
* call to configASSERT() that will always fail.
*
* If the application provides its own implementation of
* vApplicationFPUSafeIRQHandler() then the implementation of
* vApplicationIRQHandler() provided in portASM.S will save the FPU registers
* before calling it.
*
* Therefore, if the application writer wants FPU registers to be saved on
* interrupt entry their IRQ handler must be called
* vApplicationFPUSafeIRQHandler(), and if the application writer does not want
* FPU registers to be saved on interrupt entry their IRQ handler must be
* called vApplicationIRQHandler().
*/
void vApplicationFPUSafeIRQHandler( uint32_t ulICCIAR ) __attribute__((weak) );
/*-----------------------------------------------------------*/
/* A variable is used to keep track of the critical section nesting. This
@ -387,7 +408,7 @@ uint32_t ulAPSR;
}
}
/* Will only get here if xTaskStartScheduler() was called with the CPU in
/* Will only get here if vTaskStartScheduler() was called with the CPU in
a non-privileged mode or the binary point register was not set to its lowest
possible value. prvTaskExitError() is referenced to prevent a compiler
warning about it being defined but not referenced in the case that the user
@ -555,3 +576,7 @@ uint32_t ulReturn;
#endif /* configASSERT_DEFINED */
/*-----------------------------------------------------------*/
void vApplicationFPUSafeIRQHandler( uint32_t ulICCIAR )
{
configASSERT( ( volatile void * ) NULL );
}