// Invalidates an instruction cache for the specified region.
_Use_decl_annotations_ EXTERN_C void UtilInvalidateInstructionCache(
void *BaseAddress, SIZE_T Length) {
#ifdef _AMD64_
UNREFERENCED_PARAMETER(BaseAddress);
UNREFERENCED_PARAMETER(Length);
__faststorefence();
#else
KeSweepIcacheRange(TRUE, BaseAddress, Length);
#endif
}
VOID DoPatches( PBYTE pBuffer, DWORD dwLength )
{
DbgPrint( "Doing patches...\n" );
PDWORD pdwData = ( PDWORD )pBuffer;
// Sanity check
if ( pdwData[ ( dwLength / 4 ) - 1 ] != -1 )
{
DbgPrint( "Bad patch file. End is not FFFFFFFF but is %08X\n", pdwData[ ( dwLength / 4 ) - 1 ] );
return;
}
while ( TRUE )
{
DWORD dwAddress = *pdwData++;
if ( dwAddress == -1 )
break;
DWORD dwPatchCount = *pdwData++;
DbgPrint( "Patch found. Memory location 0x%08X Patch count %d\n", dwAddress, dwPatchCount );
for ( DWORD i = 0; i < dwPatchCount; i++ )
{
DWORD dwAddrToPatch = dwAddress + ( i * 4 );
DbgPrint( "Data in address %08X\n", *( DWORD* )dwAddrToPatch );
DbgPrint( "Patching %08X data patching to %08X\n", dwAddrToPatch, *pdwData );
*( DWORD* )( dwAddrToPatch ) = *pdwData++;
}
KeSweepIcacheRange( ( PVOID )dwAddress, dwPatchCount * 4 );
}
DbgPrint( "Patching complete\n" );
}
