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TitanEngine
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Merge pull request #26 from micronn/fix-membpx-pageboundary 

Fix memory breakpoints when an access spans an extra page
This commit is contained in:
Duncan Ogilvie 2025-08-17 20:28:06 +02:00 committed by GitHub
parent 2d1dcd7e1c 12f896c57e
commit 3db7179373
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GPG Key ID: B5690EEEBB952194
1 changed files with 14 additions and 1 deletions
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13
TitanEngine/TitanEngine.Debugger.DebugLoop.cpp
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@ -62,6 +62,7 @@ __declspec(dllexport) void TITCALL DebugLoop()
SIZE_T ResetBPXSize = 0;
ULONG_PTR ResetBPXAddressTo = 0;
std::function<void()> ResetMemBpxCallback;
std::function<void()> ResetMemBpxExtraCallback = nullptr;
ULONG_PTR NumberOfBytesReadWritten = 0;
HANDLE hActiveThread;
DWORD OldProtect;
@ -684,6 +685,11 @@ __declspec(dllexport) void TITCALL DebugLoop()
{
ResetMemBPX = false;
ResetMemBpxCallback();
if(ResetMemBpxExtraCallback != nullptr)
{
ResetMemBpxExtraCallback();
ResetMemBpxExtraCallback = nullptr;
}
engineStep();
}
}
@ -859,7 +865,14 @@ __declspec(dllexport) void TITCALL DebugLoop()
// - restore the protection if there are still our BPs on this page OR pass the exception to the debuggee
DBGCode = DBG_EXCEPTION_NOT_HANDLED;
// If the access is at page boundary, it can span an extra page before the internal step is run
if(ResetMemBPX)
{
ResetMemBpxExtraCallback = ResetMemBpxCallback;
ResetMemBPX = false;
}
bool bCallUserCallback = false; // when we hit a correct BP
// Access Types: 0 - read, 1 - write, 8 - execute (dep violation)