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Add additional memory barriers into ARM GCC asm code to ensure no re-ordering across asm code as optimisers get more aggressive.

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This commit is contained in:
Richard Barry 2017-03-07 04:06:10 +00:00
parent c3acc441ac
commit b9fe24962e
16 changed files with 100 additions and 98 deletions
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10
FreeRTOS/Source/portable/GCC/ARM_CM4F/port.c
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@ -563,7 +563,7 @@ void xPortSysTickHandler( void )
/* Enter a critical section but don't use the taskENTER_CRITICAL()
method as that will mask interrupts that should exit sleep mode. */
__asm volatile( "cpsid i" );
__asm volatile( "cpsid i" ::: "memory" );
__asm volatile( "dsb" );
__asm volatile( "isb" );
@ -584,7 +584,7 @@ void xPortSysTickHandler( void )
/* Re-enable interrupts - see comments above the cpsid instruction()
above. */
__asm volatile( "cpsie i" );
__asm volatile( "cpsie i" ::: "memory" );
}
else
{
@ -607,7 +607,7 @@ void xPortSysTickHandler( void )
configPRE_SLEEP_PROCESSING( xModifiableIdleTime );
if( xModifiableIdleTime > 0 )
{
__asm volatile( "dsb" );
__asm volatile( "dsb" ::: "memory" );
__asm volatile( "wfi" );
__asm volatile( "isb" );
}
@ -622,7 +622,7 @@ void xPortSysTickHandler( void )
/* Re-enable interrupts - see comments above the cpsid instruction()
above. */
__asm volatile( "cpsie i" );
__asm volatile( "cpsie i" ::: "memory" );
if( ( ulSysTickCTRL & portNVIC_SYSTICK_COUNT_FLAG_BIT ) != 0 )
{
@ -735,7 +735,7 @@ static void vPortEnableVFP( void )
uint8_t ucCurrentPriority;
/* Obtain the number of the currently executing interrupt. */
__asm volatile( "mrs %0, ipsr" : "=r"( ulCurrentInterrupt ) );
__asm volatile( "mrs %0, ipsr" : "=r"( ulCurrentInterrupt ) :: "memory" );
/* Is the interrupt number a user defined interrupt? */
if( ulCurrentInterrupt >= portFIRST_USER_INTERRUPT_NUMBER )