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MPU assert for ARM_CM3_MPU (#952)

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* Add runtime check to see if the target even has a MPU

* Add missing extern symbols for __ARMCC_VERSION support

* Add default for configTOTAL_MPU_REGIONS and change a runtime assert to compile time error

* Simplify check and link to reference documentation

Co-authored-by: Soren Ptak <ptaksoren@gmail.com>

---------

Co-authored-by: Soren Ptak <ptaksoren@gmail.com>
Co-authored-by: jasonpcarroll <23126711+jasonpcarroll@users.noreply.github.com>
This commit is contained in:
IsaacDynamo 2024-01-18 20:12:21 +01:00 committed by GitHub
parent aa07289c24
commit 52ab3d0f22
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2 changed files with 47 additions and 10 deletions
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48
portable/GCC/ARM_CM3_MPU/port.c
View file

@ -1095,12 +1095,28 @@ __attribute__( ( weak ) ) void vPortSetupTimerInterrupt( void )
static void prvSetupMPU( void )
{
extern uint32_t __privileged_functions_start__[];
extern uint32_t __privileged_functions_end__[];
extern uint32_t __FLASH_segment_start__[];
extern uint32_t __FLASH_segment_end__[];
extern uint32_t __privileged_data_start__[];
extern uint32_t __privileged_data_end__[];
#if defined( __ARMCC_VERSION )
/* Declaration when these variable are defined in code instead of being
* exported from linker scripts. */
extern uint32_t * __privileged_functions_start__;
extern uint32_t * __privileged_functions_end__;
extern uint32_t * __FLASH_segment_start__;
extern uint32_t * __FLASH_segment_end__;
extern uint32_t * __privileged_data_start__;
extern uint32_t * __privileged_data_end__;
#else
/* Declaration when these variable are exported from linker scripts. */
extern uint32_t __privileged_functions_start__[];
extern uint32_t __privileged_functions_end__[];
extern uint32_t __FLASH_segment_start__[];
extern uint32_t __FLASH_segment_end__[];
extern uint32_t __privileged_data_start__[];
extern uint32_t __privileged_data_end__[];
#endif /* if defined( __ARMCC_VERSION ) */
/* Ensure that the device has the expected MPU type */
configASSERT( portMPU_TYPE_REG == portEXPECTED_MPU_TYPE_VALUE );
/* Check the expected MPU is present. */
if( portMPU_TYPE_REG == portEXPECTED_MPU_TYPE_VALUE )
@ -1229,10 +1245,22 @@ void vPortStoreTaskMPUSettings( xMPU_SETTINGS * xMPUSettings,
StackType_t * pxBottomOfStack,
uint32_t ulStackDepth )
{
extern uint32_t __SRAM_segment_start__[];
extern uint32_t __SRAM_segment_end__[];
extern uint32_t __privileged_data_start__[];
extern uint32_t __privileged_data_end__[];
#if defined( __ARMCC_VERSION )
/* Declaration when these variable are defined in code instead of being
* exported from linker scripts. */
extern uint32_t * __SRAM_segment_start__;
extern uint32_t * __SRAM_segment_end__;
extern uint32_t * __privileged_data_start__;
extern uint32_t * __privileged_data_end__;
#else
/* Declaration when these variable are exported from linker scripts. */
extern uint32_t __SRAM_segment_start__[];
extern uint32_t __SRAM_segment_end__[];
extern uint32_t __privileged_data_start__[];
extern uint32_t __privileged_data_end__[];
#endif /* if defined( __ARMCC_VERSION ) */
int32_t lIndex;
uint32_t ul;

9
portable/GCC/ARM_CM3_MPU/portmacro.h
View file

@ -86,6 +86,15 @@ typedef unsigned long UBaseType_t;
#define portMPU_REGION_CACHEABLE_BUFFERABLE ( 0x07UL << 16UL )
#define portMPU_REGION_EXECUTE_NEVER ( 0x01UL << 28UL )
/* MPU settings that can be overriden in FreeRTOSConfig.h. */
#ifndef configTOTAL_MPU_REGIONS
/* Define to 8 for backward compatibility. */
#define configTOTAL_MPU_REGIONS ( 8UL )
#elif( configTOTAL_MPU_REGIONS != 8UL )
/* The Cortex M3 only supports 8 MPU regions. For more information refer to:
* https://developer.arm.com/documentation/dui0552/a/cortex-m3-peripherals/optional-memory-protection-unit */
#error configTOTAL_MPU_REGIONS must be 8 for this port.
#endif /* configTOTAL_MPU_REGIONS Check */
#define portSTACK_REGION ( 3UL )
#define portGENERAL_PERIPHERALS_REGION ( 4UL )
#define portUNPRIVILEGED_FLASH_REGION ( 5UL )