Edit Question - KnowledgeHub

Title Body

I'm currently implementing the last task for a little debug framework, namely HW Breakpoints. I referred to this article so far: http://www.codeproject.com/KB/debug/hardwarebreakpoint.aspx and a Book about writing a Debugger. I got following two functions so far for setting a HW breakpoint: void debuglib::breakpoints::hw_bp() { HANDLE helper = 0; CONTEXT co; CURRENTCONTEXT(co); helper = ::CreateThread(0,0,threadfunc,reinterpret_cast&lt;void*>(co.Eip),0,0); DWORD status = ::WaitForSingleObject(helper,INFINITE); if (status != WAIT_OBJECT_0) { ::MessageBoxA(0, "Helper thread didn't exit cleanly", "HWBreakpoint", MB_OK); } ::CloseHandle(helper); } static DWORD WINAPI debuglib::breakpoints::threadfunc(void* param) { DWORD suspendcnt = ::SuspendThread(debuglib::process::thread()); if(suspendcnt) { return 0; } CONTEXT co; ::ZeroMemory(&co,sizeof(co)); co.ContextFlags = CONTEXT_DEBUG_REGISTERS; BOOL ok = ::GetThreadContext(debuglib::process::thread(),&co); if(!ok) { return 0; } DWORD freeDr = 0; DWORD condition = debuglib::breakpoints::TRIGGER::CODE; DWORD length = debuglib::breakpoints::SIZE::SIZE_1; co.Dr0 = reinterpret_cast&lt;DWORD>(param); co.Dr7 = co.Dr7 | 1 &lt;&lt; (freeDr*2); co.Dr7 = co.Dr7 | condition &lt;&lt; ((freeDr*4)+16); co.Dr7 = co.Dr7 | length &lt;&lt; ((freeDr*4)+18); co.ContextFlags = CONTEXT_DEBUG_REGISTERS; ok = ::SetThreadContext(debuglib::process::thread(), &co); co.ContextFlags = CONTEXT_DEBUG_REGISTERS; ::GetThreadContext(debuglib::process::thread(),&co); suspendcnt = ::ResumeThread(debuglib::process::thread()); if(suspendcnt == 0xFFFFFFFF) { return 0; } return 1; }

Tags (comma-separated) Cancel