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1 // Copyright (c) 1994-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of the License "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // |
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15 |
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16 #include "arm_mem.h" |
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17 #include "../mmu/mm.h" |
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18 |
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19 TInt DArmPlatThread::SetupContext(SThreadCreateInfo& aInfo) |
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20 { |
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21 switch(iThreadType) |
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22 { |
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23 case EThreadSupervisor: |
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24 case EThreadMinimalSupervisor: |
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25 case EThreadInitial: |
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26 case EThreadAPInitial: |
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27 break; |
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28 case EThreadUser: |
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29 #ifndef __SMP__ |
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30 iNThread.iSpare3 /*iUserContextType*/ = NThread::EContextUndefined; |
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31 #endif |
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32 break; |
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33 } |
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34 iNThread.SetAddressSpace(iOwningProcess); |
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35 iNThread.SetAttributes(KThreadAttAddressSpace); |
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36 #ifdef __SMP__ |
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37 iCpuRestoreCookie = -1; |
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38 #else |
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39 // OK to get this thread's owning process os asid as the process can't free |
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40 // it's asid while this thread is being created because the current thread |
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41 // has the same owning process. |
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42 MM::IpcAliasPde(iAliasPdePtr,((DMemModelProcess*)iOwningProcess)->OsAsid()); |
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43 #endif |
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44 return KErrNone; |
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45 } |
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46 |
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47 TIpcExcTrap::TExcLocation TIpcExcTrap::ExcLocation(DThread* aThread, TAny* aContext) |
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48 { |
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49 TArmExcInfo& info=*(TArmExcInfo*)aContext; |
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50 if (info.iExcCode==EArmExceptionDataAbort) |
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51 { |
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52 TLinAddr va=(TLinAddr)info.iFaultAddress; |
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53 |
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54 TLinAddr aliasAddr = ((DMemModelThread*)aThread)->iAliasLinAddr; |
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55 TBool remoteError; |
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56 if(aliasAddr) |
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57 remoteError = TUint(va^aliasAddr)<TUint(KPageSize); |
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58 else |
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59 // The second clause in the statement below was "va < iRemoteBase + iSize". |
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60 // iRemoteBase + iSize might conceivably wrap round. |
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61 // The usual fix for this is to change |
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62 // va >= base && va < base + size |
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63 // to va >= base && (va - base) < size |
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64 // but this requires the first clause (va >= base) so that va-base doesn't wrap negative. |
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65 // Since the first clause in this expression is va >= (iRemoteBase & ~3) |
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66 // we have to re-write the expression as follows: |
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67 // Let base' = iRemoteBase & ~3 |
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68 // so base = base' + (base & 3) |
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69 // then we have va >= base' && va < base' + (base & 3) + iSize |
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70 // (effectively the & ~3 on the first clause extends the range downwards by base & 3) |
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71 remoteError = va>=(iRemoteBase&~3) && |
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72 (va - (iRemoteBase & ~3)) < iSize + (iRemoteBase & 3); |
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73 if (remoteError) |
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74 return EExcRemote; |
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75 |
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76 // Third clause was va < iLocalBase + iSize, fixed as in the "remoteError =" line above |
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77 if (iLocalBase && va>=(iLocalBase&~3) && |
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78 (va - (iLocalBase & ~3)) < iSize + (iLocalBase & 3)) |
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79 return EExcLocal; |
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80 } |
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81 return EExcUnknown; |
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82 } |