1 // Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).

     2 // All rights reserved.

     3 // This component and the accompanying materials are made available

     4 // under the terms of "Eclipse Public License v1.0"

     5 // which accompanies this distribution, and is available

     6 // at the URL "http://www.eclipse.org/legal/epl-v10.html".

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

    14 // For the Winscw Emulator only, selects between GCE and non-GCE version of Screen Driver.

    15 // The default is the non-GCE based version.

    16 // To select the GCE version do one of:

    17 // 1. Add a line to the epoc.ini file in \epoc32\data like this:

    18 // symbian_graphics_use_gce ON

    19 // or

    20 // 2. Start epoc.exe with these parameters, (the "--" IS necessary):

    21 // -Dsymbian_graphics_use_gce=ON --

    22 // or

    23 // 3. epoc.exe can be told to switch to a different initialisation file than epoc.ini, with the -M parameter.

    24 // Progress chaining to the real Scdv is logged in epocwind.out.

    25 // 

    26 //

    27 

    28 

    29 

    30 #include <emulator.h>

    31 

    32 #include <e32svr.h>

    33 #include <u32hal.h>

    34 

    35 

    36 extern "C" {

    37 

    38 #include "scdv_stubs.h"

    39 

    40 FARPROC vector[MAX_ORDINAL+1];

    41 

    42 

    43 void Stop(char* aErrorMessage)

    44 	{

    45 	int err = GetLastError();

    46 	RDebug::Printf("%S, (last error = %i)", aErrorMessage, err);

    47 	_asm int 3;

    48 	}

    49 

    50 void fill_vector(HINSTANCE aDll)

    51 	{

    52 	int i;

    53 	FARPROC address = NULL;

    54 	for (i=1;i<=MAX_ORDINAL;i++)

    55 		{

    56 		address = GetProcAddress(aDll, (LPCSTR)i);

    57 		if (address == NULL)

    58 			{

    59 			Stop("... has too few exported functions");

    60 			}

    61 		vector[i] = address;

    62 		}

    63 

    64 	address = GetProcAddress(aDll, (LPCSTR)i);

    65 	if (address != NULL)

    66 		{

    67 		Stop("... has too many exported functions");

    68 		}

    69 	vector[0] = (FARPROC)1;		// initialised

    70 	}

    71 

    72 // redirects DLL calls to GCE or non-GCE implementation

    73 void init_vector()

    74 	{

    75 	// ask HAL which configuration to use

    76 	TBool gce = EFalse;

    77 	UserSvr::HalFunction(EHalGroupEmulator, EEmulatorHalBoolProperty,  (TAny*)"symbian_graphics_use_gce",  &gce);

    78 	const char* library = gce ? "_generic_scdv.dll" : "_wins_scdv.dll";

    79 

    80 	RDebug::Printf("Redirecting scdv.dll to \"%s\" ...\n", library);

    81 	

    82 	Emulator::Escape();		// prevent deadlock between EKA2 scheduler and MS kernel

    83 	// try to load selected DLL

    84 	HINSTANCE instance = LoadLibraryA(library);

    85 	Emulator::Reenter();

    86 

    87 	if (instance == NULL)

    88 		{

    89 		Stop("... unable to load");

    90 		}

    91 	else

    92 		{

    93 		fill_vector(instance);

    94 		RDebug::Printf("... DLL loaded successfully");

    95 		}

    96 	}

    97 

    98 __declspec(naked) void common_dispatch()

    99 	{

   100 	_asm cmp	dword ptr vector,0		// initialised?

   101 	_asm je  	do_init_vector

   102 call_though_vector:

   103 	_asm jmp	[vector+eax*4]

   104 

   105 do_init_vector:

   106 	_asm push	eax

   107 	_asm push	ecx

   108 	_asm push	edx

   109 	_asm call	init_vector

   110 	_asm pop	edx

   111 	_asm pop 	ecx

   112 	_asm pop 	eax

   113 	_asm jmp	call_though_vector

   114 	}

   115 

   116 }