// Copyright (c) 1994-2009 Nokia Corporation and/or its subsidiary(-ies).
// All rights reserved.
// This component and the accompanying materials are made available
// under the terms of the License "Eclipse Public License v1.0"
// which accompanies this distribution, and is available
// at the URL "http://www.eclipse.org/legal/epl-v10.html".
//
// Initial Contributors:
// Nokia Corporation - initial contribution.
//
// Contributors:
//
// Description:
// e32\nkern\arm\ncmonitor.cia
// Kernel crash debugger - NKERN ARM specific portion
// 
//

#include <e32cia.h>
#include <kernel/monitor.h>
#include "nk_priv.h"
#include <arm.h>

#ifdef __CPU_HAS_MMU
#define __USE_CP15_FAULT_INFO__
#endif

EXPORT_C __NAKED__ void Monitor::HandleException()
//
// Handle an exception while the monitor is running
//
	{
	asm("mov r3, r1 ");				// exception type
	asm("ldr r0, [sp, #24] ");		// code address
#ifdef __USE_CP15_FAULT_INFO__
#ifdef __CPU_ARM_HAS_SPLIT_FSR
	asm("cmp r1, #%a0 " : : "i" ((TInt)EArmExceptionPrefetchAbort));
	asm("mrceq p15, 0, r2, c5, c0, 1");		// r2=instruction fault status
	asm("mrcne p15, 0, r2, c5, c0, 0");		// r2=data fault status
#ifdef __CPU_ARM_HAS_CP15_IFAR
	asm("mrceq p15, 0, r1, c6, c0, 2");		// r1= IFAR fault address
	asm("mrcne p15, 0, r1, c6, c0, 0");		// r1= DFAR fault address
#else 
	asm("mrc p15, 0, r1, c6, c0");			// r1= FAR fault address
#endif // __CPU_ARM_HAS_CP15_IFAR
#else
	asm("mrc p15, 0, r1, c6, c0");			// r1=fault address
	asm("mrc p15, 0, r2, c5, c0");			// r2=fault status
#endif // __CPU_ARM_HAS_SPLIT_FSR
#endif // __USE_CP15_FAULT_INFO__
	asm("add sp, sp, #28 ");		// restore mode_abt/mode_und stack balance
	asm("mov r12, #0xd1 ");			// back into mode_fiq
	asm("msr cpsr, r12 ");
	asm("ldr r12, __TheMonitorPtr ");
	asm("ldr r12, [r12] ");
	asm("add r12, r12, #%a0" : : "i" _FOFF(Monitor,iExceptionInfo));
	asm("stmia r12, {r0-r3} ");		// store exc info
	asm("mov r0, #%a0" : : "i" ((TInt)KErrAbort));
	asm("b " CSM_ZN7Monitor5LeaveEi );

	asm("__TheMonitorPtr: ");
	asm(".word TheMonitorPtr ");
	}