nmiexceptionvector.s

uCOS-II ports on Tensilica HiFi330 core.

// NMIExceptionVector.S  --  Standalone NMI Interrupt Vector/Handler
// $Id: //depot/rel/BearValley/Xtensa/OS/xtos/NMIExceptionVector.S#1 $

// Customer ID=4654; Build=0x116b0; Copyright (c) 2003 by Tensilica Inc.  ALL RIGHTS RESERVED.
// These coded instructions, statements, and computer programs are the
// copyrighted works and confidential proprietary information of Tensilica Inc.
// They may not be modified, copied, reproduced, distributed, or disclosed to
// third parties in any manner, medium, or form, in whole or in part, without
// the prior written consent of Tensilica Inc.

// The NMI exception vector handles non-maskable interrupts.

#include <xtensa/coreasm.h>
#include <xtensa/config/system.h>
#include <xtensa/config/specreg.h>

	.global _NMIExceptionVector
	.section .NMIExceptionVector.text, "ax"
	.begin	literal_prefix	.NMIExceptionVector
	.align	4

_NMIExceptionVector:

//  Insert any custom NMI handling code here.
//  For example:
//	wsr	a0, EXCSAVE_7
//	movi	a0, ...address of some save area specific to this code...
//	s32i	a1, a0, 0	// save whatever registers are needed
//	:
//	do something useful ...
//	:
//	l32i	a1, a0, 0	// restore whatever registers were saved
//	rsr	a0, EXCSAVE_7
//
//  This default NMI handler does not do anything.  It just returns
//  immediately upon any occurrence of a non-maskable interrupt.

	rfi	7


	//  If vector too big for allocated space, catch it at assembly time
	//  (albeit with cryptic "can't org backwards" error message):
	.org	XSHAL_NMI_VECTOR_SIZE
.Lendlabel:

	.text
	.end	literal_prefix