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Updates to prevent warnings when compiled with LLVM.

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This commit is contained in:
Richard Barry 2017-04-10 00:26:22 +00:00
parent 8ca40d80a9
commit 0a7a0a79d6
4 changed files with 79 additions and 25 deletions
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59
FreeRTOS/Source/portable/GCC/ARM_CM0/port.c
View file

@ -154,6 +154,8 @@ StackType_t *pxPortInitialiseStack( StackType_t *pxTopOfStack, TaskFunction_t px
static void prvTaskExitError( void )
{
volatile uint32_t ulDummy = 0UL;
/* A function that implements a task must not exit or attempt to return to
its caller as there is nothing to return to. If a task wants to exit it
should instead call vTaskDelete( NULL ).
@ -162,7 +164,16 @@ static void prvTaskExitError( void )
defined, then stop here so application writers can catch the error. */
configASSERT( uxCriticalNesting == ~0UL );
portDISABLE_INTERRUPTS();
for( ;; );
while( ulDummy == 0 )
{
/* This file calls prvTaskExitError() after the scheduler has been
started to remove a compiler warning about the function being defined
but never called. ulDummy is used purely to quieten other warnings
about code appearing after this function is called - making ulDummy
volatile makes the compiler think the function could return and
therefore not output an 'unreachable code' warning for code that appears
after it. */
}
}
/*-----------------------------------------------------------*/
@ -179,20 +190,21 @@ void vPortStartFirstTask( void )
table offset register that can be used to locate the initial stack value.
Not all M0 parts have the application vector table at address 0. */
__asm volatile(
" ldr r2, pxCurrentTCBConst2 \n" /* Obtain location of pxCurrentTCB. */
" ldr r3, [r2] \n"
" ldr r0, [r3] \n" /* The first item in pxCurrentTCB is the task top of stack. */
" add r0, #32 \n" /* Discard everything up to r0. */
" msr psp, r0 \n" /* This is now the new top of stack to use in the task. */
" .syntax unified \n"
" ldr r2, pxCurrentTCBConst2 \n" /* Obtain location of pxCurrentTCB. */
" ldr r3, [r2] \n"
" ldr r0, [r3] \n" /* The first item in pxCurrentTCB is the task top of stack. */
" adds r0, #32 \n" /* Discard everything up to r0. */
" msr psp, r0 \n" /* This is now the new top of stack to use in the task. */
" movs r0, #2 \n" /* Switch to the psp stack. */
" msr CONTROL, r0 \n"
" msr CONTROL, r0 \n"
" isb \n"
" pop {r0-r5} \n" /* Pop the registers that are saved automatically. */
" mov lr, r5 \n" /* lr is now in r5. */
" pop {r3} \n" /* Return address is now in r3. */
" pop {r2} \n" /* Pop and discard XPSR. */
" pop {r0-r5} \n" /* Pop the registers that are saved automatically. */
" mov lr, r5 \n" /* lr is now in r5. */
" pop {r3} \n" /* Return address is now in r3. */
" pop {r2} \n" /* Pop and discard XPSR. */
" cpsie i \n" /* The first task has its context and interrupts can be enabled. */
" bx r3 \n" /* Finally, jump to the user defined task code. */
" bx r3 \n" /* Finally, jump to the user defined task code. */
" \n"
" .align 4 \n"
"pxCurrentTCBConst2: .word pxCurrentTCB "
@ -225,8 +237,8 @@ BaseType_t xPortStartScheduler( void )
functionality by defining configTASK_RETURN_ADDRESS. Call
vTaskSwitchContext() so link time optimisation does not remove the
symbol. */
prvTaskExitError();
vTaskSwitchContext();
prvTaskExitError();
/* Should not get here! */
return 0;
@ -282,12 +294,16 @@ uint32_t ulSetInterruptMaskFromISR( void )
::: "memory"
);
/* To avoid compiler warnings. This line will never be reached. */
#if !defined (__ARMCC_VERSION) && (__ARMCC_VERSION >= 6010050)
/* To avoid compiler warnings. The return statement will nevere be reached,
but some compilers warn if it is not included, while others won't compile if
it is. */
return 0;
#endif
}
/*-----------------------------------------------------------*/
void vClearInterruptMaskFromISR( uint32_t ulMask )
void vClearInterruptMaskFromISR( __attribute__( ( unused ) ) uint32_t ulMask )
{
__asm volatile(
" msr PRIMASK, r0 \n"
@ -295,8 +311,12 @@ void vClearInterruptMaskFromISR( uint32_t ulMask )
::: "memory"
);
/* Just to avoid compiler warning. */
#if !defined (__ARMCC_VERSION) && (__ARMCC_VERSION >= 6010050)
/* Just to avoid compiler warning. ulMask is used from the asm code but
the compiler can't see that. Some compilers generate warnings without the
following line, while others generate warnings if the line is included. */
( void ) ulMask;
#endif
}
/*-----------------------------------------------------------*/
@ -306,12 +326,13 @@ void xPortPendSVHandler( void )
__asm volatile
(
" .syntax unified \n"
" mrs r0, psp \n"
" \n"
" ldr r3, pxCurrentTCBConst \n" /* Get the location of the current TCB. */
" ldr r2, [r3] \n"
" \n"
" sub r0, r0, #32 \n" /* Make space for the remaining low registers. */
" subs r0, r0, #32 \n" /* Make space for the remaining low registers. */
" str r0, [r2] \n" /* Save the new top of stack. */
" stmia r0!, {r4-r7} \n" /* Store the low registers that are not saved automatically. */
" mov r4, r8 \n" /* Store the high registers. */
@ -328,7 +349,7 @@ void xPortPendSVHandler( void )
" \n"
" ldr r1, [r2] \n"
" ldr r0, [r1] \n" /* The first item in pxCurrentTCB is the task top of stack. */
" add r0, r0, #16 \n" /* Move to the high registers. */
" adds r0, r0, #16 \n" /* Move to the high registers. */
" ldmia r0!, {r4-r7} \n" /* Pop the high registers. */
" mov r8, r4 \n"
" mov r9, r5 \n"
@ -337,7 +358,7 @@ void xPortPendSVHandler( void )
" \n"
" msr psp, r0 \n" /* Remember the new top of stack for the task. */
" \n"
" sub r0, r0, #32 \n" /* Go back for the low registers that are not automatically restored. */
" subs r0, r0, #32 \n" /* Go back for the low registers that are not automatically restored. */
" ldmia r0!, {r4-r7} \n" /* Pop low registers. */
" \n"
" bx r3 \n"

15
FreeRTOS/Source/portable/GCC/ARM_CM3/port.c
View file

@ -233,6 +233,8 @@ StackType_t *pxPortInitialiseStack( StackType_t *pxTopOfStack, TaskFunction_t px
static void prvTaskExitError( void )
{
volatile uint32_t ulDummy = 0UL;
/* A function that implements a task must not exit or attempt to return to
its caller as there is nothing to return to. If a task wants to exit it
should instead call vTaskDelete( NULL ).
@ -241,7 +243,16 @@ static void prvTaskExitError( void )
defined, then stop here so application writers can catch the error. */
configASSERT( uxCriticalNesting == ~0UL );
portDISABLE_INTERRUPTS();
for( ;; );
while( ulDummy == 0 )
{
/* This file calls prvTaskExitError() after the scheduler has been
started to remove a compiler warning about the function being defined
but never called. ulDummy is used purely to quieten other warnings
about code appearing after this function is called - making ulDummy
volatile makes the compiler think the function could return and
therefore not output an 'unreachable code' warning for code that appears
after it. */
}
}
/*-----------------------------------------------------------*/
@ -373,8 +384,8 @@ BaseType_t xPortStartScheduler( void )
functionality by defining configTASK_RETURN_ADDRESS. Call
vTaskSwitchContext() so link time optimisation does not remove the
symbol. */
prvTaskExitError();
vTaskSwitchContext();
prvTaskExitError();
/* Should not get here! */
return 0;

15
FreeRTOS/Source/portable/GCC/ARM_CM4F/port.c
View file

@ -258,6 +258,8 @@ StackType_t *pxPortInitialiseStack( StackType_t *pxTopOfStack, TaskFunction_t px
static void prvTaskExitError( void )
{
volatile uint32_t ulDummy = 0;
/* A function that implements a task must not exit or attempt to return to
its caller as there is nothing to return to. If a task wants to exit it
should instead call vTaskDelete( NULL ).
@ -266,7 +268,16 @@ static void prvTaskExitError( void )
defined, then stop here so application writers can catch the error. */
configASSERT( uxCriticalNesting == ~0UL );
portDISABLE_INTERRUPTS();
for( ;; );
while( ulDummy == 0 )
{
/* This file calls prvTaskExitError() after the scheduler has been
started to remove a compiler warning about the function being defined
but never called. ulDummy is used purely to quieten other warnings
about code appearing after this function is called - making ulDummy
volatile makes the compiler think the function could return and
therefore not output an 'unreachable code' warning for code that appears
after it. */
}
}
/*-----------------------------------------------------------*/
@ -415,8 +426,8 @@ BaseType_t xPortStartScheduler( void )
functionality by defining configTASK_RETURN_ADDRESS. Call
vTaskSwitchContext() so link time optimisation does not remove the
symbol. */
prvTaskExitError();
vTaskSwitchContext();
prvTaskExitError();
/* Should not get here! */
return 0;

15
FreeRTOS/Source/portable/GCC/ARM_CM7/r0p1/port.c
View file

@ -252,6 +252,8 @@ StackType_t *pxPortInitialiseStack( StackType_t *pxTopOfStack, TaskFunction_t px
static void prvTaskExitError( void )
{
volatile uint32_t ulDummy = 0;
/* A function that implements a task must not exit or attempt to return to
its caller as there is nothing to return to. If a task wants to exit it
should instead call vTaskDelete( NULL ).
@ -260,7 +262,16 @@ static void prvTaskExitError( void )
defined, then stop here so application writers can catch the error. */
configASSERT( uxCriticalNesting == ~0UL );
portDISABLE_INTERRUPTS();
for( ;; );
while( ulDummy == 0 )
{
/* This file calls prvTaskExitError() after the scheduler has been
started to remove a compiler warning about the function being defined
but never called. ulDummy is used purely to quieten other warnings
about code appearing after this function is called - making ulDummy
volatile makes the compiler think the function could return and
therefore not output an 'unreachable code' warning for code that appears
after it. */
}
}
/*-----------------------------------------------------------*/
@ -403,8 +414,8 @@ BaseType_t xPortStartScheduler( void )
functionality by defining configTASK_RETURN_ADDRESS. Call
vTaskSwitchContext() so link time optimisation does not remove the
symbol. */
prvTaskExitError();
vTaskSwitchContext();
prvTaskExitError();
/* Should not get here! */
return 0;