0:000>!dh <module start address>|<module name> -f in Software

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0:000>!dh <module start address>|<module name> -f
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Reloading the Symbols
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Because using an invalid symbol file is worse than not using any, reloading the correct symbol files is important The basic command for fixing the symbols is reload combined with the multitude of its available options Despite its name, the reload command does not load by default the new symbol files The command discards previously loaded symbol files and relies on the debugger to reload the files on the first attempt to use them Some common forms of the reload command are
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0:000>reload
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Discards symbol information for all loaded modules, returning the debugger back to the initial state Any attempt to resolve a symbol reloads the symbol file from the disk
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0:000>reload <module>
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Discards the information about a specified module Any attempt to resolve a symbol will reload the symbol file from the disk
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0:000>reload /f <module>
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Forces the debugger to immediately resolve and load the symbol file associated with the module
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0:000>reload nt
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Kernel mode debugger option It reloads the symbol file corresponding to the current Windows NT kernel, essential for most operations in the kernel mode debugger The command does not work in user mode
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0:000>reload /user
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Kernel mode debugger option It reloads all user mode symbol files for the active process
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Basic Debugger Tasks
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0:000>reload <module>=start, length
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All the commands shown previously use the information stored in the module header and in the process control block (PCB) to obtain the module address space in memory and the symbol file reference If any information is missing, as is the case when the system is low in memory, you can find the starting address from different sources (build log, identical running systems) and force the symbol load by specifying the starting address, as shown in the following example:
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0:000>reload
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rpcrt4dll=78000000,86000
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This is also useful if you have an address for a module that has already been unloaded, and you need to reconstruct the stack for the code path in the missing module
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0:000>sym noisy When the reload command fails, you must turn on the verbose log for the reload command, controlled by the sym command sym noisy enables the verbose logging after which any reload command shows all the load
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2 INTRODUCTION TO THE DEBUGGERS
attempts and their operation results
Validating Symbols
Without the correct symbols, a good developer can spend hours reading the source code, hoping to understand why the debugger shows a stack that does not make sense or why some variables have completely unrealistic values We cannot overstate the importance of ensuring that the symbols are correct But how can you be sure that the symbols are correct The first option is to use the lml command to inspect the possible warnings about symbol files Furthermore, the debugger provides an extension command that can test the validity of the symbol file against the image file This extension command takes either an address inside the loaded image or the image name The extension tests against the symbol file specified as a parameter or against the symbol file already loaded by debugger The following listing uses the extension command to validate the correctness of the loaded symbols for the image loaded at the specified address
0:000> !chksym 01001b90 02sampleexe Timestamp: 461001C1 SizeOfImage: 5000
2
Introduction to the Debuggers
pdb: 02samplepdb pdb sig: 52266847-7052-4C77-B6D9-658E94FEA2F2 age: 1 Loaded pdb is +sympath SRV\02samplepdb\5226684770524C77B6D9658E94FEA2F21\02samplepdb 02samplepdb pdb sig: 52266847-7052-4C77-B6D9-658E94FEA2F2 age: 1 MATCH: 02samplepdb and 02sampleexe
Using Symbols
Almost every command uses the symbol information, directly or indirectly, but a few are dedicated to symbol inspection The basic command to examine the symbols is x, which stands for examine symbols The command has the following general syntax:
O:000>x [options] module!symbols
Both the module part and the symbols part can contain wildcards The wildcard support is a powerful tool when debugging unfamiliar code because it allows us to guess function names or global variables well before reading the code Several common uses of the x command are listed here:
0:000>x *!*some*
Search a symbol name containing the string some in the middle of every symbol within each symbol file for the debugger target If the symbol is an exported function, the result contains both the modules implementing it, as well as the modules importing it (prefixed by _imp string), as in the following example: