Fix |thiscall| on linux for functions with arguments

The previous fix messed up parameter getters and setters.

DynamicHooks/conventions/x86GccThiscall.cpp

@@ -0,0 +1,66 @@
+/**
+* =============================================================================
+* DynamicHooks
+* Copyright (C) 2015 Robin Gohmert. All rights reserved.
+* =============================================================================
+*
+* This software is provided 'as-is', without any express or implied warranty.
+* In no event will the authors be held liable for any damages arising from 
+* the use of this software.
+* 
+* Permission is granted to anyone to use this software for any purpose, 
+* including commercial applications, and to alter it and redistribute it 
+* freely, subject to the following restrictions:
+*
+* 1. The origin of this software must not be misrepresented; you must not 
+* claim that you wrote the original software. If you use this software in a 
+* product, an acknowledgment in the product documentation would be 
+* appreciated but is not required.
+*
+* 2. Altered source versions must be plainly marked as such, and must not be
+* misrepresented as being the original software.
+*
+* 3. This notice may not be removed or altered from any source distribution.
+*
+* asm.h/cpp from devmaster.net (thanks cybermind) edited by pRED* to handle gcc
+* -fPIC thunks correctly
+*
+* Idea and trampoline code taken from DynDetours (thanks your-name-here).
+*/
+
+// ============================================================================
+// >> INCLUDES
+// ============================================================================
+#include "x86GccThiscall.h"
+
+
+// ============================================================================
+// >> CLASSES
+// ============================================================================
+
+x86GccThiscall::x86GccThiscall(ke::Vector<DataTypeSized_t> &vecArgTypes, DataTypeSized_t returnType, int iAlignment) :
+	x86GccCdecl(vecArgTypes, returnType, iAlignment)
+{
+	// Always add the |this| pointer.
+	DataTypeSized_t type;
+	type.type = DATA_TYPE_POINTER;
+	type.size = GetDataTypeSize(type, iAlignment);
+	type.custom_register = None;
+	m_vecArgTypes.insert(0, type);
+}
+
+int x86GccThiscall::GetArgStackSize()
+{
+	// Remove the this pointer from the arguments size.
+	DataTypeSized_t type;
+	type.type = DATA_TYPE_POINTER;
+	return x86GccCdecl::GetArgStackSize() - GetDataTypeSize(type, m_iAlignment);
+}
+
+void** x86GccThiscall::GetStackArgumentPtr(CRegisters* pRegisters)
+{
+	// Skip return address and this pointer.
+	DataTypeSized_t type;
+	type.type = DATA_TYPE_POINTER;
+	return (void **)(pRegisters->m_esp->GetValue<unsigned long>() + 4 + GetDataTypeSize(type, m_iAlignment));
+}

DynamicHooks/conventions/x86GccThiscall.h

@@ -40,19 +40,14 @@
 // ============================================================================
 // >> CLASSES
 // ============================================================================
+// |this| pointer is always passed as implicit first argument on the stack.
 class x86GccThiscall: public x86GccCdecl
 {
 public:
-	x86GccThiscall(ke::Vector<DataTypeSized_t> &vecArgTypes, DataTypeSized_t returnType, int iAlignment = 4) :
-		x86GccCdecl(vecArgTypes, returnType, iAlignment)
-	{
-		// Always add the |this| pointer.
-		DataTypeSized_t type;
-		type.type = DATA_TYPE_POINTER;
-		type.size = GetDataTypeSize(type, iAlignment);
-		type.custom_register = None;
-		m_vecArgTypes.insert(0, type);
-	}
+	x86GccThiscall(ke::Vector<DataTypeSized_t> &vecArgTypes, DataTypeSized_t returnType, int iAlignment = 4);
+
+	virtual int GetArgStackSize();
+	virtual void** GetStackArgumentPtr(CRegisters* pRegisters);
 };
 
 #endif // _X86_GCC_THISCALL_H

DynamicHooks/conventions/x86MsCdecl.cpp

@@ -142,6 +142,7 @@ void* x86MsCdecl::GetArgumentPtr(unsigned int iIndex, CRegisters* pRegisters)
 		return pRegister->m_pAddress;
 	}
 
+	// Skip return address.
 	size_t iOffset = 4;
 	for(unsigned int i=0; i < iIndex; i++)
 	{