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by loading a few other dynamic libraries into the process space, generating the corresponding LoadDllDebugEvents Finally, the process executes its task, and the output is combined in the console output After the process execution completes, the target generates ExitDebugProcessEvent as the last event before the process goes away It is important to understand the order of debugger events or to recognize the situations in which the debugger does not receive an event For example, when the process terminates, the debugger does not receive an UnloadDllDebugEvent for all dynamic libraries still loaded in the process It is also very important to recognize the meaning of each exception and the situations in which the Windows operating system raises a STATUS_BREAKPOINT exception to notify the debugger about a special event Knowing the debugger events and the order in which they are received during the debugger target lifetime, we use the windbgexe debugger with 02sampleexe as the debugger target for the remainder of this chapter
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Controlling Exceptions and Events from the Debugger
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Not all events are created equally, and not all are treated equally The Windows debuggers intercept all debugger events, but the way these events are handled by the debugger or how they are controlled by the user varies across event types and even from event to event Most debugger events are pure notification events that the debugger can ignore The debugger does so and automatically continues its execution, sometimes after printing a brief description of the event The debugger can also stop at that event if the user asks it to do so, enabling the user to interact with the system Although most debugger events shown previously are generated by the Windows operating system independent of the debugger target execution, the debugger target generates debugger exception events as part of normal execution The interaction between the exception-handling code and debugger is designed to minimize the runtime execution flow impact while providing the debugger maximum flexibility Debuggers can choose to treat exceptions in the same fashion as any other debugger event; they can ignore them, they can print exception information on the screen, or they can break into the debugger An EXCEPTION_DEBUG_EVENT debugger exception event can be generated more than once for the same exception, as described later in this chapter First-event occurrence, called first-chance exception, is sent as debugger aid, while the second event generated for the same exception, called secondchance exception, implies that the operating system or the application cannot handle that exception Since second-chance exceptions become unhandled exceptions that terminate the process, it is essential to investigate and understand the legitimacy of each such exception and reevaluate the application s desired behavior in such cases
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3 DEBUGGERS UNCOVERED
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Debuggers Uncovered
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Windows operating systems use a structured exception handling (SEH) mechanism to propagate the exceptions raised by the processor, into the kernel, and into user mode applications Each SEH exception type is uniquely identified by an unsigned integer representing the exception code, assigned to it when the exception is raised in the system The exceptions raised by the operating system use well-known exception codes, defined by the operating system developers (exceptions such as access violation or breakpoint exception) Other exceptions, such as C++ exceptions, are also represented in the system as structured exceptions using a specific exception code The C++ exception information is managed by the runtime provided by the compiler For example, C++ exceptions have 0xE06D7363 code, access violation exceptions have 0xC0000005 code, and breakpoint exceptions have 0x80000003 code The common exception codes, expected to be used by all software engineers developing code targeting Windows, can be found in the <ntstatush> headers in the WDK as constants defined having the STATUS_<NAME> form name, such as
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#define STATUS_BREAKPOINT ((NTSTATUS)0x80000003L)
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You might ask why this is relevant for any engineer debugging Windows code The answer is to be able to use the tools at maximum capacity The truth is that software developers have been used to working only with symbolic names and ignoring the value behind the name This indirection layer between their code and the operating system isolates them from changes in the operating system and makes their application code easy to read and understand Because symbol files have no references to the original symbolic names, the debuggers display raw numbers represented by symbolic names in the source code Since this situation is unlikely to change in the near future, and it does not change for the systems created today, it is important to become familiar with some of the magic numbers seen over and over in this book More importantly, you need to understand how to find their meaning by yourself Most exception-symbolic names used can also be found in the debugger help, including the source header or the raw value (help topic Specific Exception)
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