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help with hardware breakpoint

 
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sonexa
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Joined: 19 Sep 2011
Posts: 16
PostPosted: Sat Jan 21, 2012 9:43 am    Post subject: help with hardware breakpoint Reply with quote
i'm newbie and, i need make a dll for change EAX at breakpoint in a adress, i tryied to code, but did not work

see


Code:

procedure Debug;
var
  Event: DEBUG_EVENT;
  Adress: Pointer;
  Thread: THandle;
  Context: TContext;
begin
  Adress:=Pointer($004932A3);
  Thread:=GetCurrentThread;
  repeat
    WaitForDebugEvent(Event,INFINITE);
    if (Event.Exception.ExceptionRecord.ExceptionCode=EXCEPTION_SINGLE_STEP) then begin
      if (Event.Exception.ExceptionRecord.ExceptionAddress=Adress) then begin
        if (Thread=OpenThread(THREAD_ALL_ACCESS, false, Event.dwThreadId)) then begin
          Context.ContextFlags:= CONTEXT_FULL;
          GetThreadContext(Thread, Context);
          Form1.Memo1.Lines.Add(inttostr(DWORD(Event.Exception.ExceptionRecord.ExceptionAddress)));
          CloseHandle(Thread);
        end;
      end;
    end;
    ContinueDebugEvent(Event.dwProcessId, Event.dwThreadId, DBG_CONTINUE);
  until
  3=4;
end;


what is the problem? help me please guys c'mon
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Dark Byte
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Joined: 09 May 2003
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Location: The netherlands
PostPosted: Sat Jan 21, 2012 9:49 am    Post subject: Reply with quote
a dll may not use the Debug api

If you intent on using a dll try an exception handler instead
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sonexa
Newbie cheater
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Joined: 19 Sep 2011
Posts: 16
PostPosted: Sat Jan 21, 2012 9:49 am    Post subject: Reply with quote
where I can read about it?
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Innovation
Grandmaster Cheater
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Joined: 14 Aug 2008
Posts: 617
PostPosted: Mon Jan 23, 2012 7:36 pm    Post subject: Reply with quote
sonexa wrote:
where I can read about it?

Register a vectored exception handler using AddVectoredExceptionHandler, and then modify the debug registers in every thread using SetThreadContext.

See chapter 17.2 in volume 3B of the Intel developer manuals for further details.
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