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Continue working on the GIC-less Cortex-A5 port for IAR:

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- Add in the assert when a task attempts to exit its implementing function without deleting itself.
- Remove obsolete code from the context switch asm code (obsoleted by the fact that there is no mask register).
- Attempt to make code more generic by using definitions for additional register addresses.
This commit is contained in:
Richard Barry 2014-07-29 21:31:04 +00:00
parent e9b5deb34a
commit 3a3d061cc5
3 changed files with 26 additions and 19 deletions
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25
FreeRTOS/Source/portable/IAR/ARM_CA5_No_GIC/port.c
View file

@ -111,6 +111,11 @@ mode. */
*/
extern void vPortRestoreTaskContext( void );
/*
* Used to catch tasks that attempt to return from their implementing function.
*/
static void prvTaskExitError( void );
/*-----------------------------------------------------------*/
/* A variable is used to keep track of the critical section nesting. This
@ -137,7 +142,6 @@ uint32_t ulPortInterruptNesting = 0UL;
#warning What about branch distance in asm file.
#warning Does not support flop use in ISRs.
#warning Level interrupts must be cleared in their handling function.
#warning Can this be made generic by defining the vector address register externally?
/*
* See header file for description.
@ -165,13 +169,13 @@ StackType_t *pxPortInitialiseStack( StackType_t *pxTopOfStack, TaskFunction_t px
}
pxTopOfStack--;
#warning What about task exit error function?
/* Next the return address, which in this case is the start of the task. */
*pxTopOfStack = ( StackType_t ) pxCode;
pxTopOfStack--;
/* Next all the registers other than the stack pointer. */
*pxTopOfStack = ( StackType_t ) 0x00000000; /* R14 */
*pxTopOfStack = ( StackType_t ) prvTaskExitError; /* R14 */
pxTopOfStack--;
*pxTopOfStack = ( StackType_t ) 0x12121212; /* R12 */
pxTopOfStack--;
@ -214,6 +218,20 @@ StackType_t *pxPortInitialiseStack( StackType_t *pxTopOfStack, TaskFunction_t px
}
/*-----------------------------------------------------------*/
static void prvTaskExitError( void )
{
/* 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 ).
Artificially force an assert() to be triggered if configASSERT() is
defined, then stop here so application writers can catch the error. */
configASSERT( ulPortInterruptNesting == ~0UL );
portDISABLE_INTERRUPTS();
for( ;; );
}
/*-----------------------------------------------------------*/
BaseType_t xPortStartScheduler( void )
{
uint32_t ulAPSR;
@ -228,7 +246,6 @@ uint32_t ulAPSR;
{
/* Start the timer that generates the tick ISR. */
configSETUP_TICK_INTERRUPT();
#warning Install spurious handler
__enable_irq();
vPortRestoreTaskContext();
}

10
FreeRTOS/Source/portable/IAR/ARM_CA5_No_GIC/portASM.h
View file

@ -127,18 +127,12 @@ portRESTORE_CONTEXT macro
POP {R1}
STR R1, [R0]
; Ensure the priority mask is correct for the critical nesting depth
;_RB_ LDR R2, =portICCPMR_PRIORITY_MASK_REGISTER_ADDRESS
CMP R1, #0
MOVEQ R4, #255
;_RB_ LDRNE R4, =( configMAX_API_CALL_INTERRUPT_PRIORITY << portPRIORITY_SHIFT )
STR R4, [r2]
; Restore all system mode registers other than the SP (which is already
; being used)
POP {R0-R12, R14}
; Return to the task code, loading CPSR on the way.
; Return to the task code, loading CPSR on the way. CPSR has the interrupt
; enable bit set appropriately for the task about to execute.
RFEIA sp!
endm

10
FreeRTOS/Source/portable/IAR/ARM_CA5_No_GIC/portASM.s
View file

@ -67,10 +67,6 @@ SYS_MODE EQU 0x1f
SVC_MODE EQU 0x13
IRQ_MODE EQU 0x12
; AIC register definitions.
AIC_IVR EQU 0xFFFFF010UL
AIC_EOICR EQU 0xFFFFF038UL
SECTION .text:CODE:ROOT(2)
ARM
@ -93,7 +89,7 @@ vPortRestoreTaskContext
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; AIC interrupt handler
; IRQ interrupt handler used when individual priorities cannot be masked
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
FreeRTOS_IRQ_Handler
@ -127,7 +123,7 @@ FreeRTOS_IRQ_Handler
; Call the interrupt handler
PUSH {r0-r3, lr}
LDR r1, =AIC_IVR
LDR r1, =configINTERRUPT_VECTOR_ADDRESS
LDR r0, [r1]
STR r1, [r1] ; Write to IVR in case protect mode is being used.
BLX r0
@ -137,7 +133,7 @@ FreeRTOS_IRQ_Handler
CPSID i
; Write to the EOI register
LDR r4, =AIC_EOICR
LDR r4, =configEOI_ADDRESS
STR r0, [r4]
; Restore the old nesting count