FreeRTOS/Demo/RL78_E2Studio_GCC/src/ExampleISR.S

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*/

/*
 * This file defines the assembler wrapper for the example interrupt that is
 * defined in main.c.  The wrapper is the interrupt entry point.
 */

/* ISR_Support.h contains the definitions of portSAVE_CONTEXT() and
portRESTORE_CONTEXT(). */
#include "ISR_Support.h"

	.global	_vANExampleISR_ASM_Wrapper
	.extern _vAnExampleISR_C_Handler

	.text

	/*
	 * This demo does not include a functional interrupt service routine - so
	 * this dummy handler (which is not actually installed) is provided as an
	 * example of how an ISR that needs to cause a context switch needs to be
	 * implemented.  ISRs that do not cause a context switch have no special
	 * requirements and can be written as per the compiler documentation.
	 *
	 * This assembly wrapper function calls the main handler, which is called
	 * vAnExampleISR_C_Handler(), and is implemented in main.c.  See the
	 * documentation page for this demo on the FreeRTOS.org website for full
	 * instructions.
	 *
	 * NOTE:  vANExampleISR_ASM_Wrapper needs to be installed into the relevant
	 * vector within vector_table.c.
	 */

	 vANExampleISR_ASM_Wrapper:

	 	/* portSAVE_CONTEXT() must be the first thing called in the ASM
	 	wrapper. */
	 	portSAVE_CONTEXT

	 	/* Once the context has been saved the C handler can be called. */
	 	call !!_vAnExampleISR_C_Handler

	 	/* Finally the ISR must end with a call to portRESTORE_CONTEXT()
	 	followed by a reti instruction to return from the interrupt to whichever
	 	task is now the task selected to run (which may be different to the task
	 	that was running before the interrupt started). */
	    portRESTORE_CONTEXT
	    reti

	.end