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Allow start scheduler and free context SVC from privileged code only (#1475)

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Allow start scheduler and free context SVC from privileged code only

Signed-off-by: Gaurav Aggarwal <aggarg@amazon.com>
This commit is contained in:
Kody Stribrny 2026-08-21 10:24:35 -07:00 • committed by GitHub
parent a0e2097c6a
commit 3ca84562d8
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GPG key ID: B5690EEEBB952194
44 changed files with 1717 additions and 799 deletions
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79
portable/GCC/ARM_CM55/non_secure/port.c
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@ -1109,7 +1109,6 @@ void vPortSVCHandler_C( uint32_t * pulCallerStackAddress ) /* PRIVILEGED_FUNCTIO
{
#if ( ( configENABLE_MPU == 1 ) && ( configUSE_MPU_WRAPPERS_V1 == 1 ) )
#if defined( __ARMCC_VERSION )
/* Declaration when these variable are defined in code instead of being
* exported from linker scripts. */
extern uint32_t * __syscalls_flash_start__;
@ -1121,6 +1120,19 @@ void vPortSVCHandler_C( uint32_t * pulCallerStackAddress ) /* PRIVILEGED_FUNCTIO
#endif /* defined( __ARMCC_VERSION ) */
#endif /* ( configENABLE_MPU == 1 ) && ( configUSE_MPU_WRAPPERS_V1 == 1 ) */
#if ( configENABLE_MPU == 1 )
#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__;
#else
/* Declaration when these variable are exported from linker scripts. */
extern uint32_t __privileged_functions_start__[];
extern uint32_t __privileged_functions_end__[];
#endif /* defined( __ARMCC_VERSION ) */
#endif /* configENABLE_MPU == 1 */
uint32_t ulPC;
#if ( configENABLE_TRUSTZONE == 1 )
@ -1170,39 +1182,54 @@ void vPortSVCHandler_C( uint32_t * pulCallerStackAddress ) /* PRIVILEGED_FUNCTIO
break;
case portSVC_FREE_SECURE_CONTEXT:
#if ( configENABLE_MPU == 1 )
if( ( ulPC >= ( uint32_t ) __privileged_functions_start__ ) &&
( ulPC <= ( uint32_t ) __privileged_functions_end__ ) )
{
#endif /* configENABLE_MPU */
/* R0 contains TCB being freed and R1 contains the secure
* context handle to be freed. */
ulR0 = pulCallerStackAddress[ 0 ];
ulR1 = pulCallerStackAddress[ 1 ];
/* R0 contains TCB being freed and R1 contains the secure
* context handle to be freed. */
ulR0 = pulCallerStackAddress[ 0 ];
ulR1 = pulCallerStackAddress[ 1 ];
/* Free the secure context. */
SecureContext_FreeContext( ( SecureContextHandle_t ) ulR1, ( void * ) ulR0 );
/* Free the secure context. */
SecureContext_FreeContext( ( SecureContextHandle_t ) ulR1, ( void * ) ulR0 );
#if ( configENABLE_MPU == 1 )
}
#endif /* configENABLE_MPU */
break;
#endif /* configENABLE_TRUSTZONE */
case portSVC_START_SCHEDULER:
#if ( configENABLE_TRUSTZONE == 1 )
#if ( configENABLE_MPU == 1 )
if( ( ulPC >= ( uint32_t ) __privileged_functions_start__ ) &&
( ulPC <= ( uint32_t ) __privileged_functions_end__ ) )
{
/* De-prioritize the non-secure exceptions so that the
* non-secure pendSV runs at the lowest priority. */
SecureInit_DePrioritizeNSExceptions();
#endif /* configENABLE_MPU */
#if ( configENABLE_TRUSTZONE == 1 )
{
/* De-prioritize the non-secure exceptions so that the
* non-secure pendSV runs at the lowest priority. */
SecureInit_DePrioritizeNSExceptions();
/* Initialize the secure context management system. */
SecureContext_Init();
/* Initialize the secure context management system. */
SecureContext_Init();
}
#endif /* configENABLE_TRUSTZONE */
#if ( configENABLE_FPU == 1 )
{
/* Setup the Floating Point Unit (FPU). */
prvSetupFPU();
}
#endif /* configENABLE_FPU */
/* Setup the context of the first task so that the first task starts
* executing. */
vRestoreContextOfFirstTask();
#if ( configENABLE_MPU == 1 )
}
#endif /* configENABLE_TRUSTZONE */
#if ( configENABLE_FPU == 1 )
{
/* Setup the Floating Point Unit (FPU). */
prvSetupFPU();
}
#endif /* configENABLE_FPU */
/* Setup the context of the first task so that the first task starts
* executing. */
vRestoreContextOfFirstTask();
#endif /* configENABLE_MPU */
break;
#if ( ( configENABLE_MPU == 1 ) && ( configUSE_MPU_WRAPPERS_V1 == 1 ) )