1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/os/kernelhwsrv/kernel/eka/euser/epoc/win32/uc_trp.cpp	Fri Jun 15 03:10:57 2012 +0200
     1.3 @@ -0,0 +1,102 @@
     1.4 +// Copyright (c) 1995-2009 Nokia Corporation and/or its subsidiary(-ies).
     1.5 +// All rights reserved.
     1.6 +// This component and the accompanying materials are made available
     1.7 +// under the terms of the License "Eclipse Public License v1.0"
     1.8 +// which accompanies this distribution, and is available
     1.9 +// at the URL "http://www.eclipse.org/legal/epl-v10.html".
    1.10 +//
    1.11 +// Initial Contributors:
    1.12 +// Nokia Corporation - initial contribution.
    1.13 +//
    1.14 +// Contributors:
    1.15 +//
    1.16 +// Description:
    1.17 +// e32\euser\epoc\win32\uc_trp.cpp
    1.18 +// 
    1.19 +//
    1.20 +
    1.21 +#include <u32exec.h>
    1.22 +#include <e32panic.h>
    1.23 +#include "uc_std.h"
    1.24 +
    1.25 +GLREF_C void Panic(TCdtPanic);
    1.26 +
    1.27 +#ifndef __LEAVE_EQUALS_THROW__
    1.28 +
    1.29 +// __thiscall - parameter is expected to be removed by this function
    1.30 +EXPORT_C TInt TTrap::Trap(TInt &aResult)
    1.31 +//
    1.32 +// Save the enter frame state and return 0.
    1.33 +//
    1.34 +	{
    1.35 +	// compiler generates push ebp; mov ebp,esp here
    1.36 +	// hence correct action for Leave() is to restore ebp then mov esp,ebp; pop ebp; ret 4
    1.37 +	aResult=KErrNone;
    1.38 +	iResult=(&aResult);
    1.39 +	_asm mov eax, this
    1.40 +	_asm mov [eax], ebx
    1.41 +	_asm mov [eax+4], esi
    1.42 +	_asm mov [eax+8], edi
    1.43 +	_asm mov [eax+12], ebp
    1.44 +	_asm mov [eax+16], ds
    1.45 +	_asm mov [eax+20], es
    1.46 +	_asm mov [eax+24], fs
    1.47 +	_asm mov [eax+28], gs
    1.48 +	_asm mov edx, [ebp]
    1.49 +	_asm mov [eax+32], edx
    1.50 +	_asm mov edx, [ebp+4]
    1.51 +	_asm mov [eax+36], edx
    1.52 +	TTrapHandler* h = Exec::PushTrapFrame(this);
    1.53 +	if (h != NULL)
    1.54 +		h->Trap();
    1.55 +	return(0);
    1.56 +	}
    1.57 +
    1.58 +
    1.59 +
    1.60 +// __cdecl - this function will leave parameter on the stack
    1.61 +// but it will return to the instruction after the call to TTrap::Trap()
    1.62 +// and this expects a parameter to be popped from the stack
    1.63 +// so we must return with a ret 4, rather than leaving the compiler to generate a ret 0
    1.64 +EXPORT_C void User::Leave(TInt aReason)
    1.65 +/**
    1.66 +Leaves the currently executing function, unwinds the call stack, and returns
    1.67 +from the most recently entered trap harness.
    1.68 +
    1.69 +@param aReason The value returned from the most recent call to TRAP or TRAPD.
    1.70 +               This is known as the reason code and, typically, it gives the
    1.71 +               reason for the environment or user error causing this leave
    1.72 +               to occur.
    1.73 +              
    1.74 +@see TRAP
    1.75 +@see TRAPD              
    1.76 +*/
    1.77 +	{
    1.78 +
    1.79 +	TTrap *pT=Exec::PopTrapFrame();
    1.80 +    if (!pT)
    1.81 +        ::Panic(EUserLeaveWithoutTrap);
    1.82 +	TTrapHandler *pH=pT->iHandler;
    1.83 +	*pT->iResult=aReason;
    1.84 +	if (pH!=NULL)
    1.85 +		pH->Leave(aReason);
    1.86 +	_asm mov eax, pT
    1.87 +	_asm mov ebp, [eax+12]
    1.88 +	_asm mov esp, ebp
    1.89 +	_asm mov ebx, [eax]
    1.90 +	_asm mov esi, [eax+4]
    1.91 +	_asm mov edi, [eax+8]
    1.92 +	_asm mov ds, [eax+16]
    1.93 +	_asm mov es, [eax+20]
    1.94 +	_asm mov fs, [eax+24]
    1.95 +	_asm mov gs, [eax+28]
    1.96 +	_asm mov edx, [eax+32]
    1.97 +	_asm mov [ebp], edx
    1.98 +	_asm mov edx, [eax+36]
    1.99 +	_asm mov [ebp+4], edx
   1.100 +	_asm mov eax, 1
   1.101 +	_asm pop ebp
   1.102 +	_asm ret 4
   1.103 +	}
   1.104 +
   1.105 +#endif // !__LEAVE_EQUALS_THROW__