Migrated RL78/IAR port to EWRL78v3+ (#461)

Co-authored-by: Cobus van Eeden <35851496+cobusve@users.noreply.github.com>

portable/IAR/RL78/portasm.s

@@ -0,0 +1,84 @@
+;/*
+; * FreeRTOS Kernel <DEVELOPMENT BRANCH>
+; * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+; *
+; * SPDX-License-Identifier: MIT
+; *
+; * 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.
+; *
+; * https://www.FreeRTOS.org
+; * https://github.com/FreeRTOS
+; *
+; */
+
+#include "portmacro.h"
+
+    EXTERN    _vTaskSwitchContext
+    EXTERN    _xTaskIncrementTick
+
+    EXTERN    _interrupt_vector_table
+
+    PUBLIC    _vPortYield
+    PUBLIC    _vPortStartFirstTask
+    PUBLIC    _vPortTickISR
+
+#if !defined(__IASMRL78__) || (__VER__ < 310)
+    #error "This port requires the IAR Assembler for RL78 version 3.10 or later."
+#endif
+
+;-------------------------------------------------------------------------------
+;   FreeRTOS yield handler.  This is installed as the BRK software interrupt
+;   handler.
+;-------------------------------------------------------------------------------
+    SECTION  `.text`:CODE:ROOT(1)
+_vPortYield:
+    portSAVE_CONTEXT               ; Save the context of the current task.
+    RCALL    (_vTaskSwitchContext) ; Call the scheduler to select the next task.
+    portRESTORE_CONTEXT            ; Restore the context of the next task to run.
+    RETB
+;-------------------------------------------------------------------------------
+
+
+;-------------------------------------------------------------------------------
+;   Starts the scheduler by restoring the context of the task that will execute
+;   first.
+;-------------------------------------------------------------------------------
+    SECTION  `.text`:CODE:ROOT(1)
+_vPortStartFirstTask:
+    portRESTORE_CONTEXT            ; Restore the context of whichever task the ...
+    RETI                           ; An interrupt stack frame is used so the
+                                   ; task is started using a RETI instruction.
+;-------------------------------------------------------------------------------
+
+
+;-------------------------------------------------------------------------------
+;   FreeRTOS Timer Tick handler.
+;   This is installed as the interval timer interrupt handler.
+;-------------------------------------------------------------------------------
+    SECTION  `.text`:CODE:ROOT(1)
+_vPortTickISR:
+    portSAVE_CONTEXT               ; Save the context of the current task.
+    RCALL    (_xTaskIncrementTick) ; Call the timer tick function.
+    CMPW    AX, #0x00
+    SKZ
+    RCALL    (_vTaskSwitchContext) ; Call the scheduler to select the next task.
+    portRESTORE_CONTEXT            ; Restore the context of the next task to run.
+    RETI
+;-------------------------------------------------------------------------------
+
+    END