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dnsi0
I post too much
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Joined: 04 Jan 2007
Posts: 2674
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 Posted: Tue Nov 11, 2008 11:16 am Post subject: Debug Registers... |
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Whats the problem with this?
| Code: | tCONTEXT.ContextFlags:=CONTEXT_DEBUG_REGISTERS;
tCONTEXT.Dr7:=set0 or set1 or set2 or set3;
//Clear Registers
tCONTEXT.Dr0:=0;
tCONTEXT.Dr1:=0;
tCONTEXT.Dr2:=0;
tCONTEXT.Dr3:=0;
If reg=0 then tCONTEXT.Dr0:=Address;
If reg=1 then tCONTEXT.Dr1:=Address;
If reg=2 then tCONTEXT.Dr2:=Address;
If reg=3 then tCONTEXT.Dr3:=Address;
suspendthread(threadid);
setthreadcontext(threadid,tCONTEXT);
resumethread(threadid); |
So This is done to every thread that exists in a process. I tried getting the context first then putting it back in with the breakpoints but it doesn't work... Help? I probably made about 10 mistakes in working registers but oh well...
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BanMe
Master Cheater
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Joined: 29 Nov 2005
Posts: 375
Location: Farmington NH, USA
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| Posted: Tue Nov 11, 2008 12:19 pm Post subject: |
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a whole code section would make it far easier to debug for you 
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tombana
Master Cheater
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Joined: 14 Jun 2007
Posts: 456
Location: The Netherlands
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| Posted: Tue Nov 11, 2008 1:49 pm Post subject: |
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I don't know if it matters, but you could try first doing:
GetThreadContext, and then modify the output, and then do SetThreadContext. Because maybe the thread has already got some flags on/off which you change by doing it this way.
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BanMe
Master Cheater
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Joined: 29 Nov 2005
Posts: 375
Location: Farmington NH, USA
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| Posted: Tue Nov 11, 2008 4:07 pm Post subject: |
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i agree with Tombana but the methodology should be a bit different
| Code: | SuspendThread()
GetThreadContext()
ModifyTheContext
SetThreadContext()
FlushInstructionCache()
ResumeThread() |
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samuri25404
Grandmaster Cheater
 Reputation: 7
Joined: 04 May 2007
Posts: 955
Location: Why do you care?
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| Posted: Tue Nov 11, 2008 5:27 pm Post subject: |
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Other APIs you will probably need
| Code: |
OpenThread
CloseHandle
DebugActiveProcess
DebugActiveProcessStop
WaitForDebugEvent
ContinueDebugEvent
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dnsi0
I post too much
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Joined: 04 Jan 2007
Posts: 2674
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| Posted: Wed Nov 12, 2008 6:36 pm Post subject: |
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| I tried those things... Including DebugActiveProcess, and getting the context then setting. But nothing works on the process cause I made a dummy program where clicking a button tells you the address of the function and another button activates the function. I set a breakpoint with cheatengine and it activates when I click the 2nd button but when I try it my self with get/setthreadcontext, it does nothing...
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BanMe
Master Cheater
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Joined: 29 Nov 2005
Posts: 375
Location: Farmington NH, USA
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| Posted: Thu Nov 13, 2008 11:16 am Post subject: |
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do you have SE_DEBUG_NAME privilege?
also a more robust snippet would greatly help me help you 
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dnsi0
I post too much
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Joined: 04 Jan 2007
Posts: 2674
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| Posted: Thu Nov 13, 2008 5:59 pm Post subject: |
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| Dang... I forgot to give my process debug privs...
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