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There are a number of variants of the t command including the following:
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ta <address>: Traces until the specified address is reached and displays each
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step including any called functions tc: Traces until it reaches the next call instruction and displays each step including any called functions tt: Traces until it reaches the next ret instructions and displays each step including any called functions
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After you have completed a debug session, there are a couple of different ways to exit the debug session If you want to end the debug session and terminate the target, the q (quit) command can be used Often, it s desirable to end the debug session and let the target continue running In these cases, the qd (quit and detach) command can be used as the debugger detaches from the target application but does not terminate it The qd command is only available on Windows XP and later
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There are two different types of commands that can be used in the native debuggers The first type is called meta-commands Meta-commands are commands that can be considered built into the debugging engine itself Examples of such commands are help, sympath, and cls When executing meta-commands, all commands must be prefixed by a For example, to set the symbol path, we can use the sympath metacommand as shown in the following:
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0:000> sympath c:\adndbin Symbol search path is: c:\adndbin
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3 BASIC DEBUGGING TASKS
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To get a complete list of the meta-commands available, please use the help command The other type of command is known as the extension command Extension commands are implemented outside of the debugger engine in separate DLLs known as debugger extensions The native debuggers ship with quite a few debugger extension DLLs that have been developed by various technology groups at Microsoft to aid in debugging issues within each respective technology In addition to the extension DLLs that ship with the debugging tools, it is possible to develop your own extension DLLs by using the debugger SDK (software development kit) (Please see the debugger
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documentation or 11 of Advanced Windows Debugging) All extension commands are executed by prefixing the command with a ! For example, to invoke the htrace extension command, we would use the following:
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0:000> !htrace -enable Handle tracing enabled Handle tracing information snapshot successfully taken
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In addition to the plethora of extension DLLs shipped with Debugging Tools for Windows, there is a number of other extension DLLs Two are of particular interest when debugging managed code using the debuggers The two extension DLLs are called SOS and SOSEX Before we can use these extension DLLs, the debugger must first be notified of their presence by using the load meta-command The load meta-command takes the path to the extension DLL that you want to load For example, to load an extension DLL called myextdll located under c:\adndbin, we would use the following command:
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load c:\adndbin\myextdll
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Let s take a look at how we can load the SOS and SOSEX extension DLLs using the load meta-command
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The SOS extension DLL (sosdll) is specific to the version of the CLR that the application is using As such, each major CLR version revision ships with a new version of the SOS extension DLL to ensure that the extension DLL can take advantage of the new capabilities of that version of the CLR The SOS extension DLL is shipped as part of the runtime and can be located in the following path:
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%systemroot%\MicrosoftNET\Framework\<framework version>\sosdll
We can simply take the previous path, specify which framework version we are interested in, and pass it to the debugger using the load meta-command For example, on my system, I would use the following debugger command to load the SOS extension command corresponding to version 20 of the CLR:
load c:\windows\MicrosoftNET\Framework\v2050727\sosdll
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WHY MULTIPLE VERSIONS Why do we need multiple versions of the SOS extension DLL Because the SOS extension DLL is aware of the internals of the CLR; anytime changes or enhancements are made to the CLR, a new version of SOS must be made available
The approach just presented can be somewhat cumbersome due to having to find the correct version of the CLR the application is targeting as well as having to type in long paths To get around this problem, we can use another meta-command called loadby The general syntax of the loadby meta-command is shown in the following: