VOID
DbgPrintEvent(PLOGENTRY pLogEntry)
{
PSTR pstr;
switch (pLogEntry->nEventType)
{
case EVENT_ALLOCATE: pstr = "Allocate"; break;
case EVENT_CREATE_HANDLE: pstr = "CreatHdl"; break;
case EVENT_REFERENCE: pstr = "Ref"; break;
case EVENT_DEREFERENCE: pstr = "Deref"; break;
case EVENT_LOCK: pstr = "Lock"; break;
case EVENT_UNLOCK: pstr = "Unlock"; break;
case EVENT_DELETE: pstr = "Delete"; break;
case EVENT_FREE: pstr = "Free"; break;
case EVENT_SET_OWNER: pstr = "SetOwner"; break;
default: pstr = "Unknown"; break;
}
DbgPrint("[%ld] %03x:%03x %.8s val=%p <%lx,%lx,%lx,%lx>\n",
pLogEntry->ulUnique,
pLogEntry->dwProcessId,
pLogEntry->dwThreadId,
pstr,
pLogEntry->lParam,
REL_ADDR(pLogEntry->apvBackTrace[2]),
REL_ADDR(pLogEntry->apvBackTrace[3]),
REL_ADDR(pLogEntry->apvBackTrace[4]),
REL_ADDR(pLogEntry->apvBackTrace[5]));
}
//--------------------------------------- HookMIPS_Set --------------------------------
//
void HookMIPS_Set (dword *pFirmware, dword *pHook, dword *pHookReturn)
{
bool AlreadyHooked = FALSE;
dword *p;
AlreadyHooked = ((pFirmware [0] & CMD_MASK) == JMP_CMD);
#ifdef DEBUG_FIREBIRDLIB
TAP_Print ("FireBirdLib: F/W=%8.8p, Hook=%8.8p, HookRet=%8.8p, AlreadyHooked = %s\n", pFirmware, pHook, pHookReturn, AlreadyHooked ? "Yes" : "No");
#endif
if (!AlreadyHooked)
{
//Wir sind die Ersten, die den Hook setzen
//Patche die beiden OpCodes der Original-Routine, die durch unseren Hook überschrieben werden
pHookReturn [-2] = pFirmware [0];
pHookReturn [-1] = pFirmware [1];
//Jetzt noch der Return-Jump
pHookReturn [0] = JMP_CMD | REL_ADDR ((dword) pFirmware + 8);
//Aktiviere den Hook durch Umleiten auf unseren MIPS-Code. Ab jetzt wird scharf geschossen.
pFirmware [0] = JMP_CMD | REL_ADDR ((dword) pHook);
pFirmware [1] = NOP_CMD;
}
else
{
//Ein anderes TAP hat bereits einen Hook gesetzt, wir müssen dieses suchen
p = pFirmware;
do
{
#ifdef DEBUG_FIREBIRDLIB
TAP_Print ("FireBirdLib: Search for JMP: %p -> %x\n", p, ABS_ADDR (*p));
#endif
p = (dword *) ABS_ADDR (*p);
while ((*p & CMD_MASK) != JMP_CMD)
{
p++;
}
} while (ABS_ADDR (*p) != ((dword) &pFirmware [0] + 8));
#ifdef DEBUG_FIREBIRDLIB
TAP_Print ("FireBirdLib: Found JMP: %p -> %x\n", p, ABS_ADDR (*p));
#endif
//Gefunden, p zeigt auf den Return-JMP des letzten TAPs der Chain. Kopiere die beiden original OpCodes und leite den Jump auf uns um
pHookReturn [-2] = p [-2];
pHookReturn [-1] = p [-1];
//Jetzt noch der Return-Jump
pHookReturn [0] = JMP_CMD | REL_ADDR ((dword) pFirmware + 8);
p [0] = JMP_CMD | REL_ADDR ((dword) pHook);
p [-2] = 0;
p [-1] = 0;
}
}
//-----------------------------------------------------------------------------
// initCodeWrapper() creates a code wrapper based on TAP_GetTime. The function
// allocates a buffer and copies the code of TAP_GetTime into it except for
// the actual call of the getTime() firmware function. The address of the
// getTime() is replaced with the provided address.
// The wrapped function call supports up to 4 parameters and returns a
// short value.
// Parameters:
// fwFuncAddr - address of the FW function to be wrapped
// initCodeWrapper() returns a buffer with code wrapping the call to provided
// firmware function address.
// The buffer can be assigned to a function pointer which can be used to execute
// the wrapped code.
dword* initCodeWrapper (dword *pFwFuncAddr)
{
dword i;
// TAP_GetTime provides a template for wrapper code. The only thing to be
// changed is the address of the wrapped function.
dword *pSrc = (dword*)TAP_GetTime;
dword *pBuffer;
dword bufSize = 0;
bool found = FALSE;
// ######################
// Step 2
// get a copy of TAP_GetTime()
pSrc = (dword*)TAP_GetTime;
bufSize = 0;
// find the return statement
while(pSrc[bufSize] != JR_RA_CMD)
{
bufSize++;
}
// the buffer should include the return statement and the command following
// the return statement
bufSize += 2;
// allocate memory
pBuffer = malloc(sizeof(dword) * bufSize);
if(pBuffer == NULL) return NULL;
// patch the copy with the call to the address of the copied sendToVfdDisplay()
DBG_PRINT("MPDisplayLib: wrapper started for %08x ...\n", pFwFuncAddr);
for(i = 0; i < bufSize; i++)
{
if((pSrc[i] & CMD_MASK) == JAL_CMD)
{
// this is the wrapped call to the actual FW implementation
// replace it with the call to the provided address
pBuffer[i] = JAL_CMD | REL_ADDR(pFwFuncAddr);
found = TRUE;
}
else
{
pBuffer[i] = pSrc[i];
}
DBG_PRINT("MPDisplayLib: %08x: %08x\n", pBuffer + i, pBuffer[i]);
}
if(!found)
{
free(pBuffer);
pBuffer = NULL;
}
// return the address of the allocated code wrapper
return pBuffer;
}
void MHEGState_Enable()
{
dword *fn;
dword *addr;
if ( !MHEGState_Available )
return;
// patch TAP_GetState to return STATE_Ttx and SUBSTATE_Ttx when full screen MHEG is active
fn = (dword*)GetState;
addr = (dword*)TAP_GetState;
// save the original instructions to be executed prior to the hook code
fn[0] = addr[0];
fn[1] = addr[1];
fn[2] = JMP_CMD | REL_ADDR(addr+2);
fn[3] = NOP_CMD;
HackFirmware( (dword)(addr), JMP_CMD | REL_ADDR(GetStateHook) );
HackFirmware( (dword)(addr+1), NOP_CMD );
}
