sl@0: // Copyright (c) 1995-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: // All rights reserved.
sl@0: // This component and the accompanying materials are made available
sl@0: // under the terms of the License "Eclipse Public License v1.0"
sl@0: // which accompanies this distribution, and is available
sl@0: // at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: //
sl@0: // Initial Contributors:
sl@0: // Nokia Corporation - initial contribution.
sl@0: //
sl@0: // Contributors:
sl@0: //
sl@0: // Description:
sl@0: // e32\euser\epoc\win32\uc_trp.cpp
sl@0: // 
sl@0: //
sl@0: 
sl@0: #include <u32exec.h>
sl@0: #include <e32panic.h>
sl@0: #include "uc_std.h"
sl@0: 
sl@0: GLREF_C void Panic(TCdtPanic);
sl@0: 
sl@0: #ifndef __LEAVE_EQUALS_THROW__
sl@0: 
sl@0: // __thiscall - parameter is expected to be removed by this function
sl@0: EXPORT_C TInt TTrap::Trap(TInt &aResult)
sl@0: //
sl@0: // Save the enter frame state and return 0.
sl@0: //
sl@0: 	{
sl@0: 	// compiler generates push ebp; mov ebp,esp here
sl@0: 	// hence correct action for Leave() is to restore ebp then mov esp,ebp; pop ebp; ret 4
sl@0: 	aResult=KErrNone;
sl@0: 	iResult=(&aResult);
sl@0: 	_asm mov eax, this
sl@0: 	_asm mov [eax], ebx
sl@0: 	_asm mov [eax+4], esi
sl@0: 	_asm mov [eax+8], edi
sl@0: 	_asm mov [eax+12], ebp
sl@0: 	_asm mov [eax+16], ds
sl@0: 	_asm mov [eax+20], es
sl@0: 	_asm mov [eax+24], fs
sl@0: 	_asm mov [eax+28], gs
sl@0: 	_asm mov edx, [ebp]
sl@0: 	_asm mov [eax+32], edx
sl@0: 	_asm mov edx, [ebp+4]
sl@0: 	_asm mov [eax+36], edx
sl@0: 	TTrapHandler* h = Exec::PushTrapFrame(this);
sl@0: 	if (h != NULL)
sl@0: 		h->Trap();
sl@0: 	return(0);
sl@0: 	}
sl@0: 
sl@0: 
sl@0: 
sl@0: // __cdecl - this function will leave parameter on the stack
sl@0: // but it will return to the instruction after the call to TTrap::Trap()
sl@0: // and this expects a parameter to be popped from the stack
sl@0: // so we must return with a ret 4, rather than leaving the compiler to generate a ret 0
sl@0: EXPORT_C void User::Leave(TInt aReason)
sl@0: /**
sl@0: Leaves the currently executing function, unwinds the call stack, and returns
sl@0: from the most recently entered trap harness.
sl@0: 
sl@0: @param aReason The value returned from the most recent call to TRAP or TRAPD.
sl@0:                This is known as the reason code and, typically, it gives the
sl@0:                reason for the environment or user error causing this leave
sl@0:                to occur.
sl@0:               
sl@0: @see TRAP
sl@0: @see TRAPD              
sl@0: */
sl@0: 	{
sl@0: 
sl@0: 	TTrap *pT=Exec::PopTrapFrame();
sl@0:     if (!pT)
sl@0:         ::Panic(EUserLeaveWithoutTrap);
sl@0: 	TTrapHandler *pH=pT->iHandler;
sl@0: 	*pT->iResult=aReason;
sl@0: 	if (pH!=NULL)
sl@0: 		pH->Leave(aReason);
sl@0: 	_asm mov eax, pT
sl@0: 	_asm mov ebp, [eax+12]
sl@0: 	_asm mov esp, ebp
sl@0: 	_asm mov ebx, [eax]
sl@0: 	_asm mov esi, [eax+4]
sl@0: 	_asm mov edi, [eax+8]
sl@0: 	_asm mov ds, [eax+16]
sl@0: 	_asm mov es, [eax+20]
sl@0: 	_asm mov fs, [eax+24]
sl@0: 	_asm mov gs, [eax+28]
sl@0: 	_asm mov edx, [eax+32]
sl@0: 	_asm mov [ebp], edx
sl@0: 	_asm mov edx, [eax+36]
sl@0: 	_asm mov [ebp+4], edx
sl@0: 	_asm mov eax, 1
sl@0: 	_asm pop ebp
sl@0: 	_asm ret 4
sl@0: 	}
sl@0: 
sl@0: #endif // !__LEAVE_EQUALS_THROW__