INTRODUCTION TO THE DEBUGGERS in Software

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2 INTRODUCTION TO THE DEBUGGERS
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The first line contains the process and the thread identifier generating the last debugger event (debugger events are described in more detail in 3, Debuggers Uncovered ) displayed as (2d423c) along with the event description, a break instruction exception, and the exception code 80000003 The debugger handled the event on the first chance, before the normal exception handling in the user code (Exception handling is covered in more detail in 3) This information is not always available, but we should use it if we can find it The register values displayed on the next few lines are not so relevant at this point, with the notable exceptions of the instruction pointer (eip) and the stack pointer (esp) The register structure tells about the architecture under which this process runs, such as x64 or Itanium
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Introduction to the Debuggers
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Immediately after the register information, there is the symbol associated with the address where the last event was raised, along with the address and the instruction at that address As you will see in the remainder of the book, the instruction itself can explain the immediate cause of the break The last piece of information from the debugger output is the command prompt The prompt (0:000>) tells that we are in the user mode debugger (For a kernel mode debugger session, the prompt contains the kd string) The first number indicates the active target of this debugger, and it will be 0 for most debugging sessions The second number represents the thread number of the thread raising the debugger event
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DEBUGGING MULTIPLE TARGETS It is not a very well-known fact that the Microsoft debuggers are capable of debugging multiple remote systems at the same time In this case, the debugger will change the prompt and prefix the prompt with the system name as 0:0:000> You can read more about this in debuggers help under the Debugging Targets on Multiple Computers topic
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The kernel debugger prompts reveal information about the running environment and the stop reason Using option 2 of 02sampleexe in the presence of the kernel debugger causes the whole system to stop Listing 27 shows the kernel debugger console output while using the same commands as in the previous listing Listing 27 Kernel mode debugger output
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Break instruction exception - code 80000003 (first chance) 7c901230 cc int 3 kd> vertarget Windows XP Kernel Version 2600 (Service Pack 2) UP Free x86 compatible Product: WinNt, suite: TerminalServer SingleUserTS Built by: 2600xpsp_sp2_rtm040803-2158 Kernel base = 0x804d7000 PsLoadedModuleList = 0x8055ab20 Debug session time: Tue May 29 20:47:16107 2007 (GMT-7) System Uptime: 0 days 0:11:24844 kd> lastevent Last event: Break instruction exception - code 80000003 (first chance) debugger time: Tue May 29 20:48:23671 2007 (GMT-7) kd> || 0 Remote KD: KdSrv:Server=@{<Local>},Trans=@{COM:Port=\\\pipe\pipe1,Baud=19200,Pipe,Timeout=4000, Resets=2}
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Basic Debugger Tasks
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The first few lines indicate the cause of the current break, the amount of information being dependent of the stop type In this example, the kernel debugger encountered a break instruction and stopped The debugger also tells the exception code 80000003 generated by the break instruction The next line contains the address of the current instruction pointer followed by the current instruction in assembly language A 64-bit address for the instruction indicates that the current processor runs in 64-bit mode In this case, the 32-bit address indicates a processor executing in 32-bit mode The operating system version and architecture are displayed in response to the vertarget command The debugger uses kd> as a prompt when the debugger target is a single processor system and n:kd> as a prompt when the debugger target has more than one processor The numeral denotes the logical processor number generating the current debugger event
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