sl@0: // Copyright (c) 1994-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: // All rights reserved.
sl@0: // This component and the accompanying materials are made available
sl@0: // under the terms of the License "Eclipse Public License v1.0"
sl@0: // which accompanies this distribution, and is available
sl@0: // at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: //
sl@0: // Initial Contributors:
sl@0: // Nokia Corporation - initial contribution.
sl@0: //
sl@0: // Contributors:
sl@0: //
sl@0: // Description:
sl@0: // e32\nkern\arm\ncmonitor.cia
sl@0: // Kernel crash debugger - NKERN ARM specific portion
sl@0: // 
sl@0: //
sl@0: 
sl@0: #include <e32cia.h>
sl@0: #include <kernel/monitor.h>
sl@0: #include "nk_priv.h"
sl@0: #include <arm.h>
sl@0: 
sl@0: #ifdef __CPU_HAS_MMU
sl@0: #define __USE_CP15_FAULT_INFO__
sl@0: #endif
sl@0: 
sl@0: EXPORT_C __NAKED__ void Monitor::HandleException()
sl@0: //
sl@0: // Handle an exception while the monitor is running
sl@0: //
sl@0: 	{
sl@0: 	asm("mov r3, r1 ");				// exception type
sl@0: 	asm("ldr r0, [sp, #24] ");		// code address
sl@0: #ifdef __USE_CP15_FAULT_INFO__
sl@0: #ifdef __CPU_ARM_HAS_SPLIT_FSR
sl@0: 	asm("cmp r1, #%a0 " : : "i" ((TInt)EArmExceptionPrefetchAbort));
sl@0: 	asm("mrceq p15, 0, r2, c5, c0, 1");		// r2=instruction fault status
sl@0: 	asm("mrcne p15, 0, r2, c5, c0, 0");		// r2=data fault status
sl@0: #ifdef __CPU_ARM_HAS_CP15_IFAR
sl@0: 	asm("mrceq p15, 0, r1, c6, c0, 2");		// r1= IFAR fault address
sl@0: 	asm("mrcne p15, 0, r1, c6, c0, 0");		// r1= DFAR fault address
sl@0: #else 
sl@0: 	asm("mrc p15, 0, r1, c6, c0");			// r1= FAR fault address
sl@0: #endif // __CPU_ARM_HAS_CP15_IFAR
sl@0: #else
sl@0: 	asm("mrc p15, 0, r1, c6, c0");			// r1=fault address
sl@0: 	asm("mrc p15, 0, r2, c5, c0");			// r2=fault status
sl@0: #endif // __CPU_ARM_HAS_SPLIT_FSR
sl@0: #endif // __USE_CP15_FAULT_INFO__
sl@0: 	asm("add sp, sp, #28 ");		// restore mode_abt/mode_und stack balance
sl@0: 	asm("mov r12, #0xd1 ");			// back into mode_fiq
sl@0: 	asm("msr cpsr, r12 ");
sl@0: 	asm("ldr r12, __TheMonitorPtr ");
sl@0: 	asm("ldr r12, [r12] ");
sl@0: 	asm("add r12, r12, #%a0" : : "i" _FOFF(Monitor,iExceptionInfo));
sl@0: 	asm("stmia r12, {r0-r3} ");		// store exc info
sl@0: 	asm("mov r0, #%a0" : : "i" ((TInt)KErrAbort));
sl@0: 	asm("b " CSM_ZN7Monitor5LeaveEi );
sl@0: 
sl@0: 	asm("__TheMonitorPtr: ");
sl@0: 	asm(".word TheMonitorPtr ");
sl@0: 	}
sl@0: