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233 lines (196 loc) · 8.45 KB
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/**
* =============================================================================
* Source Python
* Copyright (C) 2012 Source Python Development Team. All rights reserved.
* =============================================================================
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License, version 3.0, as published by the
* Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the Source Python Team gives you permission
* to link the code of this program (as well as its derivative works) to
* "Half-Life 2," the "Source Engine," and any Game MODs that run on software
* by the Valve Corporation. You must obey the GNU General Public License in
* all respects for all other code used. Additionally, the Source.Python
* Development Team grants this exception to all derivative works.
*/
// ============================================================================
// >> INCLUDES
// ============================================================================
#include "memory_callback.h"
#include "utility/wrap_macros.h"
#include "utility/call_python.h"
#include "AsmJit.h"
using namespace AsmJit;
#include "utilities.h"
#include "DynamicHooks.h"
using namespace DynamicHooks;
// ============================================================================
// >> MACROS
// ============================================================================
#define GET_CALLBACK_CALLER(type) \
(void *) GET_FUNCTION(type, CallbackCaller<type>, CCallback*, unsigned long, unsigned long)
// ============================================================================
// >> CLASSES
// ============================================================================
CCallback::CCallback(object oCallback, Convention_t eConv, tuple args, object return_type, bool bAutoDealloc /* = true */)
: CFunction(NULL, eConv, args, return_type)
{
m_oCallback = oCallback;
m_bAutoDealloc = bAutoDealloc;
// Find the proper callback caller function
void* pCallCallbackFunc = NULL;
ReturnType_t RetType;
try
{
RetType = extract<ReturnType_t>(m_oReturnType);
}
catch ( ... )
{
PyErr_Clear();
RetType = RET_POINTER;
}
switch(RetType)
{
case SIGCHAR_VOID: pCallCallbackFunc = GET_CALLBACK_CALLER(void); break;
case SIGCHAR_BOOL: pCallCallbackFunc = GET_CALLBACK_CALLER(bool); break;
case SIGCHAR_CHAR: pCallCallbackFunc = GET_CALLBACK_CALLER(char); break;
case SIGCHAR_UCHAR: pCallCallbackFunc = GET_CALLBACK_CALLER(unsigned char); break;
case SIGCHAR_SHORT: pCallCallbackFunc = GET_CALLBACK_CALLER(short); break;
case SIGCHAR_USHORT: pCallCallbackFunc = GET_CALLBACK_CALLER(unsigned short); break;
case SIGCHAR_INT: pCallCallbackFunc = GET_CALLBACK_CALLER(int); break;
case SIGCHAR_UINT: pCallCallbackFunc = GET_CALLBACK_CALLER(unsigned int); break;
case SIGCHAR_LONG: pCallCallbackFunc = GET_CALLBACK_CALLER(long); break;
case SIGCHAR_ULONG: pCallCallbackFunc = GET_CALLBACK_CALLER(unsigned long); break;
case SIGCHAR_LONGLONG: pCallCallbackFunc = GET_CALLBACK_CALLER(long long); break;
case SIGCHAR_ULONGLONG: pCallCallbackFunc = GET_CALLBACK_CALLER(unsigned long long); break;
case SIGCHAR_FLOAT: pCallCallbackFunc = GET_CALLBACK_CALLER(float); break;
case SIGCHAR_DOUBLE: pCallCallbackFunc = GET_CALLBACK_CALLER(double); break;
case SIGCHAR_POINTER: pCallCallbackFunc = GET_CALLBACK_CALLER(void *); break;
case SIGCHAR_STRING: pCallCallbackFunc = GET_CALLBACK_CALLER(char *); break;
default: BOOST_RAISE_EXCEPTION(PyExc_ValueError, "Unknown return type.");
}
// Generate the function
Assembler a;
// Epilog
a.push(ebp);
a.mov(ebp, esp);
// Call callback caller
a.push(ecx);
a.push(ebp);
a.push(imm((sysint_t) this));
a.call(pCallCallbackFunc);
a.add(esp, imm(12));
// Prolog
a.mov(esp, ebp);
a.pop(ebp);
// Return
a.ret(imm(GetPopSize()));
m_ulAddr = (unsigned long) a.make();
}
int CCallback::GetPopSize()
{
/*
Who cleans up the stack?
Linux: Always the caller
Windows:
CDECL: Caller
STDCALL + THISCALL: Callee
*/
#ifdef _WIN32
if (m_eConv == CONV_CDECL)
return 0;
int i = 0;
// Skip the this pointer. It's passed in an own register (ECX)
if (m_eConv == CONV_THISCALL)
i++;
int size = 0;
for(; i < len(m_Args); i++)
size += GetTypeSize(extract<Argument_t>(m_Args[i]));
return size;
#endif
return 0;
}
int CCallback::GetArgumentOffset(int iIndex)
{
int offset = 8;
if (iIndex == 0)
return offset;
for(int i=0; i <= iIndex - 1; i++)
{
offset += GetTypeSize(extract<Argument_t>(m_Args[i]));
}
// Subtract the this pointer on Windows
#ifdef _WIN32
if (m_eConv == CONV_THISCALL)
offset -= sizeof(void *);
#endif
return offset;
}
void CCallback::Dealloc()
{
MemoryManager::getGlobal()->free((void *) m_ulAddr);
m_ulAddr = 0;
}
CPointer* CCallback::Realloc(int iSize)
{
BOOST_RAISE_EXCEPTION(PyExc_NotImplementedError, "This function is not implemented for callbacks.")
return NULL;
}
// ============================================================================
// >> FUNCTIONS
// ============================================================================
template<class T>
T GetArgument(CCallback* pCallback, unsigned long ulEBP, unsigned long ulECX, int iIndex)
{
#ifdef _WIN32
if (pCallback->m_eConv == CONV_THISCALL && iIndex == 0)
return *(T *) &ulECX;
#endif
return *(T *) (ulEBP + pCallback->GetArgumentOffset(iIndex));
}
object CallCallback(CCallback* pCallback, unsigned long ulEBP, unsigned long ulECX)
{
// TODO: Make this crash proof
BEGIN_BOOST_PY()
list arg_list;
for(int i=0; i < len(pCallback->m_Args); i++)
{
object val;
switch(extract<Argument_t>(pCallback->m_Args[i]))
{
case SIGCHAR_BOOL: val = object(GetArgument<bool>(pCallback, ulEBP, ulECX, i)); break;
case SIGCHAR_CHAR: val = object(GetArgument<char>(pCallback, ulEBP, ulECX, i)); break;
case SIGCHAR_UCHAR: val = object(GetArgument<unsigned char>(pCallback, ulEBP, ulECX, i)); break;
case SIGCHAR_SHORT: val = object(GetArgument<short>(pCallback, ulEBP, ulECX, i)); break;
case SIGCHAR_USHORT: val = object(GetArgument<unsigned short>(pCallback, ulEBP, ulECX, i)); break;
case SIGCHAR_INT: val = object(GetArgument<int>(pCallback, ulEBP, ulECX, i)); break;
case SIGCHAR_UINT: val = object(GetArgument<unsigned int>(pCallback, ulEBP, ulECX, i)); break;
case SIGCHAR_LONG: val = object(GetArgument<long>(pCallback, ulEBP, ulECX, i)); break;
case SIGCHAR_ULONG: val = object(GetArgument<unsigned long>(pCallback, ulEBP, ulECX, i)); break;
case SIGCHAR_LONGLONG: val = object(GetArgument<long long>(pCallback, ulEBP, ulECX, i)); break;
case SIGCHAR_ULONGLONG: val = object(GetArgument<unsigned long long>(pCallback, ulEBP, ulECX, i)); break;
case SIGCHAR_FLOAT: val = object(GetArgument<float>(pCallback, ulEBP, ulECX, i)); break;
case SIGCHAR_DOUBLE: val = object(GetArgument<double>(pCallback, ulEBP, ulECX, i)); break;
case SIGCHAR_POINTER: val = object(ptr(new CPointer(GetArgument<unsigned long>(pCallback, ulEBP, ulECX, i)))); break;
case SIGCHAR_STRING: val = object(GetArgument<const char*>(pCallback, ulEBP, ulECX, i)); break;
default: BOOST_RAISE_EXCEPTION(PyExc_TypeError, "Unknown argument type."); break;
}
arg_list.append(val);
}
arg_list.append(ptr(new CPointer((unsigned long) ulEBP)));
return eval("lambda func, args: func(*args)")(pCallback->m_oCallback, arg_list);
END_BOOST_PY_NORET()
PythonLog(0, "[SP] An exception occured while calling the Python callback. The server will now crash!");
// Throw an exception. We will crash now :(
throw;
}