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90 lines
3.4 KiB
Plaintext
90 lines
3.4 KiB
Plaintext
;/*
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; * FreeRTOS Kernel V10.2.1
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; * Copyright (C) 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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; *
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; * Permission is hereby granted, free of charge, to any person obtaining a copy of
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; * this software and associated documentation files (the "Software"), to deal in
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; * the Software without restriction, including without limitation the rights to
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; * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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; * the Software, and to permit persons to whom the Software is furnished to do so,
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; * subject to the following conditions:
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; *
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; * The above copyright notice and this permission notice shall be included in all
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; * copies or substantial portions of the Software.
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; *
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; * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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; * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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; * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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; * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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; * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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; * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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; *
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; * http://www.FreeRTOS.org
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; * http://aws.amazon.com/freertos
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; *
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; * 1 tab == 4 spaces!
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; */
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;*
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; * This file defines the assembler wrapper for the example interrupt that is
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; * defined in main.c. The wrapper is the interrupt entry point.
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; *
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; ISR_Support.h contains the definitions of portSAVE_CONTEXT() and
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; portRESTORE_CONTEXT().
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#include "ISR_Support.h"
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PUBLIC vANExampleISR_ASM_Wrapper
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EXTERN vAnExampleISR_C_Handler
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RSEG CODE:CODE
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; *
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; * This demo does not include a functional interrupt service routine - so
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; * this dummy handler (which is not actually installed) is provided as an
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; * example of how an ISR that needs to cause a context switch needs to be
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; * implemented. ISRs that do not cause a context switch have no special
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; * requirements and can be written as per the compiler documentation.
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; *
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; * This assembly wrapper function calls the main handler, which is called
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; * vAnExampleISR_C_Handler(), and is implemented in main.c. See the
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; * documentation page for this demo on the FreeRTOS.org website for full
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; * instructions.
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; *
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; * NOTE: vANExampleISR_ASM_Wrapper needs to be installed into the relevant
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; * vector, an example of how to do this from an assembly file is locate at
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; * the bottom of this file.
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; *
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vANExampleISR_ASM_Wrapper:
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; portSAVE_CONTEXT() must be the first thing called in the ASM
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; wrapper.
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portSAVE_CONTEXT
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; Once the context has been saved the C handler can be called.
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call !!vAnExampleISR_C_Handler
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; Finally the ISR must end with a call to portRESTORE_CONTEXT()
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; followed by a reti instruction to return from the interrupt to whichever
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; task is now the task selected to run (which may be different to the task
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; that was running before the interrupt started).
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portRESTORE_CONTEXT
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reti
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; The interrupt handler can be installed into the vector table in the same
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; assembly file.
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; Ensure the vector table segement is used.
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COMMON INTVEC:CODE:ROOT(1)
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;
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; Place a pointer to the asm wrapper at the correct index into the vector
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; table. Note 56 is used is purely as an example. The correct vector
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; number for the interrupt being installed must be used.
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ORG 58
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DW vANExampleISR_ASM_Wrapper
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END
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