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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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//
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#include "arm_mem.h"
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#include "../mmu/mm.h"
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TInt DArmPlatThread::SetupContext(SThreadCreateInfo& aInfo)
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{
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switch(iThreadType)
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{
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case EThreadSupervisor:
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case EThreadMinimalSupervisor:
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case EThreadInitial:
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case EThreadAPInitial:
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break;
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case EThreadUser:
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#ifndef __SMP__
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iNThread.iSpare3 /*iUserContextType*/ = NThread::EContextUndefined;
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#endif
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break;
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}
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iNThread.SetAddressSpace(iOwningProcess);
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iNThread.SetAttributes(KThreadAttAddressSpace);
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#ifdef __SMP__
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iCpuRestoreCookie = -1;
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#else
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// OK to get this thread's owning process os asid as the process can't free
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// it's asid while this thread is being created because the current thread
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// has the same owning process.
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MM::IpcAliasPde(iAliasPdePtr,((DMemModelProcess*)iOwningProcess)->OsAsid());
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#endif
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return KErrNone;
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}
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TIpcExcTrap::TExcLocation TIpcExcTrap::ExcLocation(DThread* aThread, TAny* aContext)
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{
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TArmExcInfo& info=*(TArmExcInfo*)aContext;
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if (info.iExcCode==EArmExceptionDataAbort)
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{
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TLinAddr va=(TLinAddr)info.iFaultAddress;
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TLinAddr aliasAddr = ((DMemModelThread*)aThread)->iAliasLinAddr;
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TBool remoteError;
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if(aliasAddr)
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remoteError = TUint(va^aliasAddr)<TUint(KPageSize);
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else
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// The second clause in the statement below was "va < iRemoteBase + iSize".
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// iRemoteBase + iSize might conceivably wrap round.
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// The usual fix for this is to change
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// va >= base && va < base + size
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// to va >= base && (va - base) < size
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// but this requires the first clause (va >= base) so that va-base doesn't wrap negative.
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// Since the first clause in this expression is va >= (iRemoteBase & ~3)
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// we have to re-write the expression as follows:
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// Let base' = iRemoteBase & ~3
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// so base = base' + (base & 3)
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// then we have va >= base' && va < base' + (base & 3) + iSize
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// (effectively the & ~3 on the first clause extends the range downwards by base & 3)
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remoteError = va>=(iRemoteBase&~3) &&
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(va - (iRemoteBase & ~3)) < iSize + (iRemoteBase & 3);
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if (remoteError)
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return EExcRemote;
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// Third clause was va < iLocalBase + iSize, fixed as in the "remoteError =" line above
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if (iLocalBase && va>=(iLocalBase&~3) &&
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(va - (iLocalBase & ~3)) < iSize + (iLocalBase & 3))
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return EExcLocal;
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}
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return EExcUnknown;
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}
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