Update demo project for Tensilita - work in progres..

Add support for POSIX style errno - work in progress.

FreeRTOS/Source/include/FreeRTOS.h

@@ -806,6 +806,10 @@ extern "C" {
 	#define configUSE_TASK_NOTIFICATIONS 1
 #endif
 
+#ifndef configUSE_POSIX_ERRNO
+	#define configUSE_POSIX_ERRNO 0
+#endif
+
 #ifndef portTICK_TYPE_IS_ATOMIC
 	#define portTICK_TYPE_IS_ATOMIC 0
 #endif
@@ -928,6 +932,10 @@ V8 if desired. */
 	#define pdTASK_CODE TaskFunction_t
 	#define xListItem ListItem_t
 	#define xList List_t
+
+	/* For libraries that break the list data hiding, and access list structure
+	members directly (which is not supposed to be done). */
+	#define pxContainer pvContainer
 #endif /* configENABLE_BACKWARD_COMPATIBILITY */
 
 #if( configUSE_ALTERNATIVE_API != 0 )
@@ -1033,7 +1041,9 @@ typedef struct xSTATIC_TCB
 	#if( INCLUDE_xTaskAbortDelay == 1 )
 		uint8_t ucDummy21;
 	#endif
-
+	#if ( configUSE_POSIX_ERRNO == 1 )
+		int				iDummy22;
+	#endif
 } StaticTask_t;
 
 /*

FreeRTOS/Source/portable/IAR/ARM_CM3/portmacro.h

@@ -78,6 +78,12 @@ typedef unsigned long UBaseType_t;
 #define portBYTE_ALIGNMENT			8
 /*-----------------------------------------------------------*/
 
+/* Compiler directives. */
+#define portWEAK_SYMBOL				__attribute__( ( weak ) )
+
+/*-----------------------------------------------------------*/
+
+
 /* Scheduler utilities. */
 #define portYIELD()											\
 {															\

FreeRTOS/Source/tasks.c

@@ -336,6 +336,10 @@ typedef struct TaskControlBlock_t
 		uint8_t ucDelayAborted;
 	#endif
 
+	#if( configUSE_POSIX_ERRNO == 1 )
+		int iTaskErrno;
+	#endif
+
 } tskTCB;
 
 /* The old tskTCB name is maintained above then typedefed to the new TCB_t name
@@ -365,6 +369,12 @@ PRIVILEGED_DATA static List_t xPendingReadyList;						/*< Tasks that have been r
 
 #endif
 
+/* Global POSIX errno. Its value is changed upon context switching to match
+the errno of the currently running task. */
+#if ( configUSE_POSIX_ERRNO == 1 )
+	int FreeRTOS_errno = 0;
+#endif
+
 /* Other file private variables. --------------------------------*/
 PRIVILEGED_DATA static volatile UBaseType_t uxCurrentNumberOfTasks 	= ( UBaseType_t ) 0U;
 PRIVILEGED_DATA static volatile TickType_t xTickCount 				= ( TickType_t ) configINITIAL_TICK_COUNT;
@@ -2919,11 +2929,25 @@ void vTaskSwitchContext( void )
 		/* Check for stack overflow, if configured. */
 		taskCHECK_FOR_STACK_OVERFLOW();
 
+		/* Before the currently running task is switched out, save its errno. */
+		#if( configUSE_POSIX_ERRNO == 1 )
+		{
+			pxCurrentTCB->iTaskErrno = FreeRTOS_errno;
+		}
+		#endif
+
 		/* Select a new task to run using either the generic C or port
 		optimised asm code. */
 		taskSELECT_HIGHEST_PRIORITY_TASK(); /*lint !e9079 void * is used as this macro is used with timers and co-routines too.  Alignment is known to be fine as the type of the pointer stored and retrieved is the same. */
 		traceTASK_SWITCHED_IN();
 
+		/* After the new task is switched in, update the global errno. */
+		#if( configUSE_POSIX_ERRNO == 1 )
+		{
+			FreeRTOS_errno = pxCurrentTCB->iTaskErrno;
+		}
+		#endif
+
 		#if ( configUSE_NEWLIB_REENTRANT == 1 )
 		{
 			/* Switch Newlib's _impure_ptr variable to point to the _reent