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The lastevent command displays information about the last debugger event that caused the current debugger to stop 3 explains the origin and importance of possible debugger events Listing 217 shows a sample of output generated by the lastevent command in two cases: after the debugger stopped because of a userdefined breakpoint and, in the second output, because of an operation on an inaccessible memory location Knowing why the debugger stopped can sometimes complete the investigation, as is the case with the initial process breakpoint or process exit breakpoint
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Listing 217 lastevent output
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0:000> * after a breakpoint 0:000> lastevent Last event: 170c1464: Hit breakpoint 2 0:000> * after an access violation exception 0:000> lastevent Last event: 170c1464: Access violation - code c0000005 (first chance)
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The program you are debugging behaves differently depending on the operating system and the updates installed on it not because it uses a feature of one of those releases, but because the operating system mechanism can change between releases At the same time, the debugger and its extensions use components implemented in the operating system, which can behave differently across different releases, introducing limitations to the debugger tool itself So, except for the case in which you are debugging a component not dependent on operating system services, you most likely need to know the operating system version, the debugger version, the loaded extension version, and so on The vertarget command is a subset of the version command, which displays only the version of the operating system running the debugger target The version command shows additional information about the debugger environment, the command line used to start the debugging session, as shown in Listing 218 If the system uses more than one processor, the first line also shows the number of active processors; otherwise, it shows the UP (which stands for uni processor) string Listing 218 The version output from a user mode debugger
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0:000> version Windows XP Version 2600 (Service Pack 2) UP Free x86 compatible Product: WinNt, suite: SingleUserTS kernel32dll version: 5126003119 (xpsp_sp2_gdr070416-1301) Debug session time: Sun Jul 8 14:31:35259 2007 (GMT-7) System Uptime: 0 days 0:10:39826 Process Uptime: 0 days 0:00:04356 Kernel time: 0 days 0:00:00030 User time: 0 days 0:00:00020 Live user mode: <Local> command line: c:\Program Files\Debugging Tools for Windows \ntsd notepad
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2 INTRODUCTION TO THE DEBUGGERS
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Listing 218 The version output from a user mode debugger (continued)
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Debugger Process 0x738 dbgeng: image 6600075, built Sat Jul 08 13:12:40 2006 [path: c:\Program Files\Debugging Tools for Windows\dbgengdll] dbghelp: image 6600075, built Sat Jul 08 13:11:32 2006 [path: c:\Program Files\Debugging Tools for Windows\dbghelpdll] DIA version: 60516 Extension DLL search Path: c:\Program Files\Debugging Tools for Windows\winext;c:\Program Files\Debugging Tools for Windows\winext\arcade;c:\Program Files\Debugging Tools for Windows\WINXP;c:\Program Files\Debugging Tools for Windows\pri;c:\Program Files\Debugging Tools for Windows;c:\Program Files\Debugging Tools for Windows\winext\arcade;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS \System32\Wbem Extension DLL chain: dbghelp: image 6600075, API 606, built Sat Jul 08 13:11:32 2006 [path: c:\Program Files\Debugging Tools for Windows\dbghelpdll] ext: image 6600075, API 100, built Sat Jul 08 13:10:52 2006 [path: c:\Program Files\Debugging Tools for Windows\winext\extdll] exts: image 6600075, API 100, built Sat Jul 08 13:10:48 2006 [path: c:\Program Files\Debugging Tools for Windows\WINXP\extsdll] uext: image 6600075, API 100, built Sat Jul 08 13:11:02 2006 [path: c:\Program Files\Debugging Tools for Windows\winext\uextdll] ntsdexts: image 6054570, API 100, built Sat Jul 08 13:29:38 2006 [path: c:\Program Files\Debugging Tools for Windows\WINXP\ntsdextsdll]
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After we know why the debugger stopped, what operating system it runs on, and what extensions are available for our investigations, it is time to find an explanation for the current break The process of finding the reason for the break can be compared to forensics work of collecting and questioning every piece of evidence that we can get from the debugger, exploring all unknown elements, and validating any assumption that we made while investigating the failure The first step is to validate symbol correctness, as described in the symbol section If the symbols are not correct, we can easily fix them, as described in the earlier section Reloading the Symbols The r command, which stands for register, provides the access to processor registers In the simplest form, it displays all register values according to the register mask active on the debugger The r command can also load a register with a user-entered value That option is extremely useful when you use the debugger to simulate various
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