Re-sync with upstream and stripping away none kernel related.

portable/IAR/STR91x/portasm.s79

@@ -0,0 +1,60 @@
+/*
+ * FreeRTOS Kernel V10.3.0
+ * Copyright (C) 2020 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://www.FreeRTOS.org
+ * http://aws.amazon.com/freertos
+ *
+ * 1 tab == 4 spaces!
+ */
+
+		RSEG ICODE:CODE
+		CODE32
+
+	EXTERN vTaskSwitchContext
+
+	PUBLIC vPortYieldProcessor
+	PUBLIC vPortStartFirstTask
+
+#include "ISR_Support.h"
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+; Starting the first task is just a matter of restoring the context that
+; was created by pxPortInitialiseStack().
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+vPortStartFirstTask:
+	portRESTORE_CONTEXT
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+; Manual context switch function.  This is the SWI hander.
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+vPortYieldProcessor:
+	ADD		LR, LR, #4			; Add 4 to the LR to make the LR appear exactly
+								; as if the context was saved during and IRQ
+								; handler.
+								
+	portSAVE_CONTEXT			; Save the context of the current task...
+	LDR R0, =vTaskSwitchContext	; before selecting the next task to execute.
+	MOV     lr, pc
+	BX R0
+	portRESTORE_CONTEXT			; Restore the context of the selected task.
+
+	END
+