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// Copyright (c) 1994-2009 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\memmodel\epoc\direct\arm\xkernel.cpp
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//
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//
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#include "arm_mem.h"
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/********************************************
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* Thread
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********************************************/
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TInt DArmPlatThread::SetupContext(SThreadCreateInfo& anInfo)
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{
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#ifndef __SMP__
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if(iThreadType==EThreadUser)
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iNThread.iSpare3 /*iUserContextType*/ = NThread::EContextUndefined;
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#endif
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return KErrNone;
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}
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DArmPlatProcess::DArmPlatProcess()
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{}
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DArmPlatProcess::~DArmPlatProcess()
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{
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__KTRACE_OPT(KMMU,Kern::Printf("DArmPlatProcess destruct"));
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DMemModelProcess::Destruct();
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}
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TBool Exc::IsMagic(TLinAddr /*anAddress*/)
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//
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// Return TRUE if anAddress is a 'magic' exception handling instruction
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//
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{
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return EFalse;
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}
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void DThread::IpcExcHandler(TExcTrap* aTrap, DThread* aThread, TAny* aContext)
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{
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aThread->iIpcClient = 0;
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TIpcExcTrap& xt=*(TIpcExcTrap*)aTrap;
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TArmExcInfo& info=*(TArmExcInfo*)aContext;
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if (info.iExcCode==EArmExceptionDataAbort)
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{
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TUint32 opcode = *(TUint32*)info.iR15; // faulting instruction
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if (opcode>=0xf0000000)
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return; // not a load/store so fault the kernel
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TUint32 opc1 = (opcode>>25)&7;
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TBool load;
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if ( (opc1==2) || (opc1==4) || (opc1==3 && !(opcode&0x10)) )
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load=opcode & 0x00100000; // bit 20=1 for load, 0 for store
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else if (opc1==0)
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{
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TUint32 opc2 = (opcode>>4)&0xf;
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if (opc2==0x0b)
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load=opcode & 0x00100000; // bit 20=1 for load, 0 for store
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else if ((opc2&0x0d)==0x0d)
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{
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if (opcode&0x00100000)
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load=ETrue; // LDRSB/LDRSH
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else
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load=(opcode&0x20)^0x20; // LDRD/STRD, bit5=1 for STRD, 0 for LDRD
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}
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else
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return; // not a load/store so fault the kernel
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}
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else
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return; // not a load/store so fault the kernel
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if ((load && !xt.iDir) || (!load && xt.iDir))
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xt.Exception(KErrBadDescriptor); // problem accessing remote address - 'leave' so an error code will be returned
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NKern::UnlockSystem(); // else assume problem accessing local address - return and panic current thread as usual
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}
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// otherwise return and fault kernel
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}
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