author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 07 Jan 2010 13:38:45 +0200 | |
changeset 10 | 36bfc973b146 |
parent 9 | 96e5fb8b040d |
permissions | -rw-r--r-- |
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// Copyright (c) 1995-2009 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\euser\epoc\win32\uc_trp.cpp |
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// |
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// |
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#include <u32exec.h> |
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#include <e32panic.h> |
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#include "uc_std.h" |
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GLREF_C void Panic(TCdtPanic); |
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#ifndef __LEAVE_EQUALS_THROW__ |
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// __thiscall - parameter is expected to be removed by this function |
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EXPORT_C TInt TTrap::Trap(TInt &aResult) |
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// |
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// Save the enter frame state and return 0. |
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// |
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{ |
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// compiler generates push ebp; mov ebp,esp here |
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// hence correct action for Leave() is to restore ebp then mov esp,ebp; pop ebp; ret 4 |
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aResult=KErrNone; |
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iResult=(&aResult); |
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_asm mov eax, this |
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_asm mov [eax], ebx |
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_asm mov [eax+4], esi |
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_asm mov [eax+8], edi |
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_asm mov [eax+12], ebp |
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_asm mov [eax+16], ds |
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_asm mov [eax+20], es |
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_asm mov [eax+24], fs |
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_asm mov [eax+28], gs |
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_asm mov edx, [ebp] |
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_asm mov [eax+32], edx |
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_asm mov edx, [ebp+4] |
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_asm mov [eax+36], edx |
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TTrapHandler* h = Exec::PushTrapFrame(this); |
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if (h != NULL) |
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h->Trap(); |
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return(0); |
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} |
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|
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|
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|
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// __cdecl - this function will leave parameter on the stack |
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// but it will return to the instruction after the call to TTrap::Trap() |
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// and this expects a parameter to be popped from the stack |
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// so we must return with a ret 4, rather than leaving the compiler to generate a ret 0 |
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EXPORT_C void User::Leave(TInt aReason) |
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/** |
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Leaves the currently executing function, unwinds the call stack, and returns |
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from the most recently entered trap harness. |
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|
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@param aReason The value returned from the most recent call to TRAP or TRAPD. |
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This is known as the reason code and, typically, it gives the |
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reason for the environment or user error causing this leave |
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to occur. |
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|
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@see TRAP |
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@see TRAPD |
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*/ |
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{ |
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|
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TTrap *pT=Exec::PopTrapFrame(); |
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if (!pT) |
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::Panic(EUserLeaveWithoutTrap); |
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TTrapHandler *pH=pT->iHandler; |
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*pT->iResult=aReason; |
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if (pH!=NULL) |
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pH->Leave(aReason); |
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_asm mov eax, pT |
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_asm mov ebp, [eax+12] |
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_asm mov esp, ebp |
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_asm mov ebx, [eax] |
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_asm mov esi, [eax+4] |
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_asm mov edi, [eax+8] |
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_asm mov ds, [eax+16] |
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_asm mov es, [eax+20] |
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_asm mov fs, [eax+24] |
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_asm mov gs, [eax+28] |
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_asm mov edx, [eax+32] |
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_asm mov [ebp], edx |
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_asm mov edx, [eax+36] |
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_asm mov [ebp+4], edx |
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_asm mov eax, 1 |
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_asm pop ebp |
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_asm ret 4 |
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} |
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|
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#endif // !__LEAVE_EQUALS_THROW__ |