Following investigation, it seems that OutputDebugString can trigger a
loader lock as it throws an exception which can be handled by a global
exception handler, which may try and load/unload DLLs or perform other
unsafe tasks (e.g. StackWalk). The safest solution is to remove the
debug string logging altogether from code paths that run from DllMain.
It would be nice to further simplify DllMain but that would be a
significant amount of additional work.
* Remove unused parameters from SendDebugMessage functions
* Add SendDebugEntry and SendDebugExit functions for tracking
function entry/exit
* Add indenting and function names to log entries
* Remove unused debug functions
* Eliminate now-unused hwnd parameter in initialization functions
* Replace Log,LogEntry,LogExit functions with SendDebug equivalents in
kmtip
Many functions now have SendDebugEntry/SendDebugExit (or
return_SendDebugExit) pairs. It is important to SendDebugExit on all
returns from a function to keep the log indent depth consistent. In some
cases I chose not to add these logging calls, e.g. on frequently called
functions such as the message hooks.
