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// Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of the License "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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// e32\kernel\arm\cscmdatasave.cpp
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// SCM - Arm portion
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//
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//
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#define __INCLUDE_REG_OFFSETS__ // for SP_R13U in nk_plat.h
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#include "arm_mem.h"
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#include "nk_plat.h"
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#include <scmdatatypes.h>
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#include <scmdatasave.h>
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/**
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* Reads the CPU registers at the time of the crash
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* @param aRegs struct to store the resulting CPU registers
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*/
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void SCMDataSave::ReadCPURegisters(SFullArmRegSet& aRegs)
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{
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aRegs =*(SFullArmRegSet*)iMonitor->iRegs;
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}
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/**
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* Reads the user registers for a given thread - may not be the current thread
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* @param aThread thread whose registers we want to read
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* @param aRegs registers will be written here if available
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* @return KErrArgument if aThread is the current thread or any of the system wide error codes
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*/
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TInt SCMDataSave::ReadUserRegisters(DThread* aThread, TArmRegSet& aRegs, TUint32& aAvailableRegs)
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{
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TFileName filename;
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aThread->TraceAppendFullName(filename, EFalse);
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//we retrieve the registers differently for the current thread
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if(aThread == &Kern::CurrentThread())
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{
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return KErrArgument;
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}
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TUint32* stackPointer = (TUint32*)aThread->iNThread.iSavedSP; //Still need to check pointer somehow
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TUint32* stackTop = (TUint32*)((TUint32)aThread->iNThread.iStackBase +(TUint32)aThread->iNThread.iStackSize);
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TArmReg* out = (TArmReg*)(&aRegs);
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//Get a pointer to this threads context table
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NThread::TUserContextType type = aThread->iNThread.UserContextType();
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const TArmContextElement* table = aThread->iNThread.UserContextTables()[type];
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aAvailableRegs = 0;
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for(TInt i = 0; i<KArmRegisterCount; ++i)
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{
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TInt value = table[i].iValue;
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TInt type = table[i].iType;
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if(type == TArmContextElement::EOffsetFromSp)
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{
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value = stackPointer[value];
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aAvailableRegs |= (1<<i);
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}
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else if(type == TArmContextElement::EOffsetFromStackTop)
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{
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value = stackTop[-value];
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aAvailableRegs |= (1<<i);
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}
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else if(type == TArmContextElement::ESpPlusOffset)
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{
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value = (TInt)(stackPointer + value);
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aAvailableRegs |= (1<<i);
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}
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out[i] = value;
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}
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return KErrNone;
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}
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/**
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* Reads the system registers for a given thread
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* Can not be used on the current thread
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* @param aThread
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* @param aRegs
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* @param aAvailableRegs
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* @return KErrArgument if aThread is the current thread or any of the system wide error codes
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*/
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TInt SCMDataSave::ReadSystemRegisters(DThread* aThread, TArmRegSet& aRegs, TUint32& aAvailableRegs)
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{
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if(aThread == &Kern::CurrentThread())
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{
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return KErrArgument;
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}
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TFileName filename;
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aThread->TraceAppendFullName(filename, EFalse);
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TUint32* stackPointer = (TUint32*)aThread->iNThread.iSavedSP;
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TUint32* stackTop = (TUint32*)((TUint32)aThread->iNThread.iStackBase +(TUint32)aThread->iNThread.iStackSize);
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TArmReg* out = (TArmReg*)(&aRegs);
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//Get a pointer to this threads context table
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const TArmContextElement* table = aThread->iNThread.UserContextTables()[NThread::EContextKernel];
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aAvailableRegs = 0;
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for(TInt i = 0; i<KArmRegisterCount; ++i)
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{
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TInt value = table[i].iValue;
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TInt type = table[i].iType;
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if(type == TArmContextElement::EOffsetFromSp)
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{
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//ensure we are still on the stack
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if(stackPointer + value >= stackTop)
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continue;
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value = stackPointer[value];
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aAvailableRegs |= (1<<i);
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}
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else if(type == TArmContextElement::EOffsetFromStackTop)
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{
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//ensure we are still on the stack
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if(stackTop - value < (TUint32*)aThread->iNThread.iStackBase)
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continue;
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value = stackTop[-value];
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aAvailableRegs |= (1<<i);
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}
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else if(type == TArmContextElement::ESpPlusOffset)
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{
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value = (TInt)(stackPointer + value);
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aAvailableRegs |= (1<<i);
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}
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out[i] = value;
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}
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return KErrNone;
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}
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//EOF
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