CODEWITHSUNDEEP
windbgdebug-symbols
code-factory
code-factory

Reputation: 259

Load dbg symbol file into WinDbg

I have a MAP file for a DLL which I'm trying to debug. I converted this to a DBG file with the Map2Dbg-tool and put it into the symbol path.

Issuing a .reload /f mydll.dll doesn't work though, a symbol load error occurs.

I then tried to diagnose it with !sym noisy and it tells me that Windbg looks into the correct symbol path, but only for a PDB file (mydll.pdb).

Is there a way to force Windbg to find my DBG file?

Edit:

Here are some further infos:

Symbol search path in Windbg:

> .sympath
e:\code-factory\symbols;cache*;SRV*http://msdl.microsoft.com/download/symbols

dbg-file is in that directory:

e:\code-factory\symbols> dir /b
cdmod.dbg
cdmod.map
...

.reload output:

> .reload /f cdmod.dll

DBGHELP: e:\code-factory\symbols\cdmod.pdb - file not found
DBGHELP: e:\code-factory\symbols\dll\cdmod.pdb - file not found
DBGHELP: e:\code-factory\symbols\symbols\dll\cdmod.pdb - file not found
SYMSRV:  D:\Portable\Debugging Tools for Windows\x86\sym\cdmod.pdb\BD09115E93474ABCB6152149A23F95372\cdmod.pdb not found
SYMSRV:  Get File Path: /download/symbols/cdmod.pdb/BD09115E93474ABCB6152149A23F95372/cdmod.pdb


************* Symbol Loading Error Summary **************
Module name            Error
cdmod                    PDB not found : e:\code-factory\symbols\symbols\dll\cdmod.pdb
                Unable to locate the .pdb file in this location

                       PDB not found : cache*
                Unable to locate the .pdb file in this location

                       The system cannot find the file specified : SRV*http://msdl.microsoft.com/download/symbols
                The SYMSRV client failed to find a file in the UNC store, or there
                is an invalid UNC store (an invalid path or the pingme.txt file is
                not present in the root directory), or the file is present in the
                symbol server exclusion list.

Thanks

Upvotes: 6

Views: 21218

Answers (1)

blabb
blabb

Reputation: 9007

Drag and Drop the *.dbg file to the folder where exe exists
if lm output of the module indivates imagexxxxxxx instead of the module name
change the name of dbg file to match it like imagexxxxx.dbg do .reload /f and windbg should load your dbg file with cv code symbols

pre directory contents

    :\>dir /b
    msgbox.exe
    msgbox.map  < created via ida produce map

convert map to dbg

    :\>map2dbg msgbox.exe  lucian wischik utility
    Converted 7 symbols.

post directory contents

    :\>dir /b
    msgbox.dbg
    msgbox.exe
    msgbox.map

load exe in windbg

    :\>windbg msgbox.exe    
0:000> lm 
start    end        module name
00400000 00404000   image00400000   (deferred) 

0:000> .reload /f
Reloading current modules
ERROR:Module load completed but symbols could not be loaded for image00400000 

0:000> lm e
start    end        module name
00400000 00404000   image00400000   (no symbols)

$ rename the msgbox.dbg to image00400000.dbg

renaming the dbg file

    :\>ren msgbox.dbg image00400000.dbg        
    :\>dir /b
    image00400000.dbg
    msgbox.exe
    msgbox.map

symbol file with cv code symbol info loaded into windbg

0:000> .reload /f
Reloading current modules
0:000> lm e
start    end        module name
0:000> lm m i*
start    end        module name
00400000 00404000   image00400000   (codeview symbols)     
C:\Documents and Settings\Admin\Desktop\nosym\image00400000.dbg

0:000> x image00400000!*
00401000 image00400000!start = <no type information>
0040101a image00400000!MessageBoxA = <no type information>
00401020 image00400000!ExitProcess = <no type information>
00403000 image00400000!Caption = <no type information>
00403019 image00400000!Text = <no type information>

0:000> da image00400000!Caption
00403000  "Iczelion's tutorial no.2"

Upvotes: 5

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