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Introduce the prvTaskExitError() function for all ARM_CMn ports.

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Introduce the configTASK_RETURN_ADDRESS macro for the GCC ARM_CMn ports.
Improve time slippage penalty when entering tickless mode is abandoned.
This commit is contained in:
Richard Barry 2013-10-08 11:30:40 +00:00
parent 81e141ad86
commit aedf7824cb
7 changed files with 217 additions and 29 deletions
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11
FreeRTOS/Source/portable/GCC/ARM_CM0/port.c
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@ -86,6 +86,15 @@
/* Constants required to set up the initial stack. */
#define portINITIAL_XPSR ( 0x01000000 )
/* Let the user override the pre-loading of the initial LR with the address of
prvTaskExitError() in case is messes up unwinding of the stack in the
debugger. */
#ifdef configTASK_RETURN_ADDRESS
#define portTASK_RETURN_ADDRESS configTASK_RETURN_ADDRESS
#else
#define portTASK_RETURN_ADDRESS prvTaskExitError
#endif
/* Each task maintains its own interrupt status in the critical nesting
variable. */
static unsigned portBASE_TYPE uxCriticalNesting = 0xaaaaaaaa;
@ -126,7 +135,7 @@ portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) pxCode; /* PC */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) prvTaskExitError; /* LR */
*pxTopOfStack = ( portSTACK_TYPE ) portTASK_RETURN_ADDRESS; /* LR */
pxTopOfStack -= 5; /* R12, R3, R2 and R1. */
*pxTopOfStack = ( portSTACK_TYPE ) pvParameters; /* R0 */
pxTopOfStack -= 8; /* R11..R4. */