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code, the address at which the exception was raised, and exception arguments The EXCEPTION_DEBUG_EVENT second member, the dwFirstChance flag, tells the debugger whether this is the first notification about this exception The whole aspect of firstversus second-chance (exception) notification is treated in detail later in this chapter From the Windows operating system perspective, the debugger must interpret the exception and use either DBG_CONTINUE or DBG_EXCEPTION_NOT_HANDLED as the parameter to ContinueDebugEvent In the first case, Windows assumes that the exception has been properly dismissed, the condition causing the exception is no longer present, and the execution can continue at the address that caused the exception In the second case, Windows behaves as if the debugger is not even present and continues its normal dispatching procedure Listing 36 shows the minimal handler used in the 03sampleexe sample design, so it does not affect the Windows exception mechanism for most of the exceptions Because the Windows operating system notifies the debugger about other special operations using an STATUS_BREAKPOINT exception, our exception handler returns DBG_CONTINUE for such exceptions Listing 36 Processing exception debug event
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case EXCEPTION_DEBUG_EVENT: //typedef struct _EXCEPTION_DEBUG_INFO { // EXCEPTION_RECORD ExceptionRecord; // DWORD dwFirstChance; //} EXCEPTION_DEBUG_INFO; std::cout << ExceptiondebugEvent\nException Code:\t << std::hex << dbgEventuExceptionExceptionRecordExceptionCode; std::cout << \tFirstChance:\t << dbgEventuExceptiondwFirstChance <<std::endl; switch (dbgEventuExceptionExceptionRecordExceptionCode) { case EXCEPTION_BREAKPOINT: case EXCEPTION_SINGLE_STEP: return DBG_CONTINUE; } return DBG_EXCEPTION_NOT_HANDLED;
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The return code from the handling routine is returned to Windows as the last parameter of the ContinueDebugEvent API, having the dwContinueStatus name
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In the time interval between the moments the debugger loop returns from the WaitForDebugEvent API until the call to ContinueDebugEvent API is made, the debugger target does not run, and its state remains unchanged While the target is suspended, a full debugger implementation would enter into an interactive mode accepting user commands and would execute them using various means As part of the execution, the debugger can use debugger APIs to find out more information about the debugger target and the debugger event, it can examine the symbol files associated with the debugger target modules, and it can use any other Win32 API to provide any functionality the user requests When the command entered on the debugger input lines is an execution command, the debugger calls ContinueDebugEvent and waits for the next event With all this information and code available in the sample, it is time to obtain the list of all events generated by the debugger target using our 03sampleexe Listing 37 contains the console output generated by running the sample, which uses xcopyexe as a parameter and debugger target Listing 37 Debugger events generated by a simple process execution (xcopyexe)
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C:\>C:\AWDBIN\WinXPx86chk\03sampleexe xcopyexe DebugEvent from PIDTID=3330832256 EventType: CreateProcessDebugEvent PID: 33308 DebugEvent from PIDTID=3330832256 EventType: LoadDllDebugEvent Mapped address: 7C900000 ImageName: ntdlldll DebugEvent from PIDTID=3330832256 EventType: LoadDllDebugEvent Mapped address: 7C800000 ImageName: C:\WINDOWS\system32\kernel32dll
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More LoadDllDebugEvent DebugEvent from PIDTID=3330832256 EventType: LoadDllDebugEvent Mapped address: 77920000 ImageName: C:\WINDOWS\system32\setupapiDLL DebugEvent from PIDTID=3330832256
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Listing 37 Debugger events generated by a simple process execution (xcopyexe) (continued)
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EventType: ExceptiondebugEvent Exception Code: 80000003 FirstChance: 1
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DebugEvent from PIDTID=3330832256 EventType: LoadDllDebugEvent Mapped address: 5CB70000 ImageName: C:\WINDOWS\system32\ShimEngdll More LoadDllDebugEvent DebugEvent from PIDTID=3330832256 EventType: LoadDllDebugEvent Mapped address: 5D090000 ImageName: C:\WINDOWS\system32\comctl32dll Invalid number of parameters 0 File(s) copied DebugEvent from PIDTID=3330832256 EventType: ExitProcessDebugEvent ExitCode: 4
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Listing 37 shows the order of events and deserves some comment The first event received by the debugger when starting the debugger target is CreateProcessDebugEvent, followed by a series of LoadDllDebugEvents, one for each dynamic library the process depends on Because LoadDllDebugEvent is not generated for the process image itself, CreateProcessEvent contains the information present in LoadDllDebugEvent, such as the handle to the executable file, the image starting address, the debug info pointers, and the executable image name plus event-specific information, such as the process handle, the first thread s handle, or the start address The event is generated after the module has been mapped to the process space, and it can be used to set breakpoints in the process code or to examine global variables After all modules are mapped in the debugger target, the debugger target is ready to run, and the debugger is notified that the process is ready to run This is the best opportunity to set breakpoints before the process actually starts The debugger is notified by the kernel using a STATUS_BREAKPOINT exception (identified by the 0x80000003 exception code) At this point, the 03sampleexe sample application returns DBG_CONTINUE, enabling the debugger target to start process execution Process execution continues
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