winedbg − Wine debugger


winedbg [ options ] [ program_name [ program_arguments ] | wpid ]

winedbg --gdb [ options ] [ program_name [ program_arguments ] | wpid ]

winedbg --auto wpid

winedbg --minidump [ file.mdmp ] wpid

winedbg file.mdmp


winedbg is a debugger for Wine. It allows:

+ debugging native Win32 applications
+ debugging Winelib applications
+ being a drop-in replacement for Dr Watson


winedbg can be used in five modes. The first argument to the program determines the mode winedbg will run in.

Without any explicit mode, this is standard winedbg operating mode. winedbg will act as the front end for the user.


winedbg will be used as a proxy for gdb. gdb will be the front end for command handling, and winedbg will proxy all debugging requests from gdb to the Win32 APIs.


This mode is used when winedbg is set up in AeDebug registry entry as the default debugger. winedbg will then display basic information about a crash. This is useful for users who don’t want to debug a crash, but rather gather relevant information about the crash to be sent to developers.


This mode is similar to the --auto one, except that instead of printing the information on the screen (as --auto does), it’s saved into a minidump file. The name of the file is either passed on the command line, or generated by WineDbg when none is given. This file could later on be reloaded into winedbg for further examination.


In this mode winedbg reloads the state of a debuggee which has been saved into a minidump file. See either the minidump command below, or the --minidump mode.


When in default mode, the following options are available:

winedbg will execute the command string as if it was keyed on winedbg command line, and then will exit. This can be handy for getting the pid of running processes (winedbg --command "info proc").

--file filename

winedbg will execute the list of commands contained in file filename as if they were keyed on winedbg command line, and then will exit.

When in gdb proxy mode, the following options are available:

gdb will not be automatically started. Relevant information for starting gdb are printed on screen. This is somehow useful when not directly using gdb but some graphical front-ends, like ddd or kgbd.


This will run gdb in its own xterm instead of using the current Unix console for textual display.

In all modes, the rest of the command line, when passed, is used to identify which programs, if any, has to debugged:

This is the name of an executable to start for a debugging session. winedbg will actually create a process with this executable. If programs_arguments are also given, they will be used as arguments for creating the process to be debugged.


winedbg will attach to the process which Windows pid is wpid. Use the info proc command within winedbg to list running processes and their Windows pids.


If nothing is specified, you will enter the debugger without any run nor attached process. You’ll have to do the job yourself.


Default mode, and while reloading a minidump file:
Most of commands used in winedbg are similar to the ones from gdb. Please refer to the gdb documentations for some more details. See the gdb differences section later on to get a list of variations from gdb commands.

Misc. commands


Aborts the debugger.


Exits the debugger.

attach N

Attach to a Wine process (N is its Windows ID, numeric or hexadecimal). IDs can be obtained using the info process command. Note the info process command returns hexadecimal values


Detach from a Wine-process.

Help commands


Prints some help on the commands.

help info

Prints some help on info commands

Flow control commands


Continue execution until next breakpoint or exception.


Pass the exception event up to the filter chain.


Continue execution until next C line of code (enters function call)


Continue execution until next C line of code (doesn’t enter function call)


Execute next assembly instruction (enters function call)


Execute next assembly instruction (doesn’t enter function call)


Execute until return of current function is reached.

cont, step, next, stepi, nexti can be postfixed by a number (N), meaning that the command must be executed N times before control is returned to the user.

Breakpoints, watchpoints

Enables (break|watch)-point N

disable N

Disables (break|watch)-point N

delete N

Deletes (break|watch)-point N

cond N

Removes any existing condition to (break|watch)-point N

cond N expr

Adds condition expr to (break|watch)-point N. expr will be evaluated each time the (break|watch)-point is hit. If the result is a zero value, the breakpoint isn’t triggered.

break * N

Adds a breakpoint at address N

break id

Adds a breakpoint at the address of symbol id

break id N

Adds a breakpoint at the line N inside symbol id.

break N

Adds a breakpoint at line N of current source file.


Adds a breakpoint at current PC address.

watch * N

Adds a watch command (on write) at address N (on 4 bytes).

watch id

Adds a watch command (on write) at the address of symbol id. Size depends on size of id.

rwatch * N

Adds a watch command (on read) at address N (on 4 bytes).

rwatch id

Adds a watch command (on read) at the address of symbol id. Size depends on size of id.

info break

Lists all (break|watch)-points (with their state).

You can use the symbol EntryPoint to stand for the entry point of the Dll.

When setting a (break|watch)-point by id, if the symbol cannot be found (for example, the symbol is contained in a not yet loaded module), winedbg will recall the name of the symbol and will try to set the breakpoint each time a new module is loaded (until it succeeds).

Stack manipulation


Print calling stack of current thread.

bt N

Print calling stack of thread of ID N. Note: this doesn’t change the position of the current frame as manipulated by the up & dn commands).


Goes up one frame in current thread’s stack

up N

Goes up N frames in current thread’s stack


Goes down one frame in current thread’s stack

dn N

Goes down N frames in current thread’s stack

frame N

Sets N as the current frame for current thread’s stack.

info locals

Prints information on local variables for current function frame.

Directory & source file manipulation
show dir

Prints the list of dirs where source files are looked for.

dir pathname

Adds pathname to the list of dirs where to look for source files


Deletes the list of dirs where to look for source files

symbolfile pathname

Loads external symbol definition file pathname

symbolfile pathname N

Loads external symbol definition file pathname (applying an offset of N to addresses)


Lists 10 source lines forwards from current position.

list -

Lists 10 source lines backwards from current position

list N

Lists 10 source lines from line N in current file

list pathname:N

Lists 10 source lines from line N in file pathname

list id

Lists 10 source lines of function id

list * N

Lists 10 source lines from address N

You can specify the end target (to change the 10 lines value) using the ’,’ separator. For example:
list 123, 234

lists source lines from line 123 up to line 234 in current file

list foo.c:1,56

lists source lines from line 1 up to 56 in file foo.c


A display is an expression that’s evaluated and printed after the execution of any winedbg command.
info display

Lists the active displays

display expr

Adds a display for expression expr

display /fmt expr

Adds a display for expression expr. Printing evaluated expr is done using the given format (see print command for more on formats)

del display N

Deletes display N



Disassemble from current position

disas expr

Disassemble from address expr

disas expr,expr

Disassembles code between addresses specified by the two expressions

Memory (reading, writing, typing)


Examines memory at address expr

x /fmt expr

Examines memory at address expr using format fmt

print expr

Prints the value of expr (possibly using its type)

print /fmt expr

Prints the value of expr (possibly using its type)

set var expr

Writes the value of expr in var variable

whatis expr

Prints the C type of expression expr


is either letter or count letter, where letter can be:


an ASCII string


a UTF16 Unicode string


instructions (disassemble)


32-bit unsigned hexadecimal integer


32-bit signed decimal integer


16-bit unsigned hexadecimal integer


character (only printable 0x20-0x7f are actually printed)


8-bit unsigned hexadecimal integer


Win32 GUID


Expressions in Wine Debugger are mostly written in a C form. However, there are a few discrepancies:

Identifiers can take a ’!’ in their names. This allows mainly to specify a module where to look the ID from, e.g. USER32!CreateWindowExA.

In a cast operation, when specifying a structure or a union, you must use the struct or union keyword (even if your program uses a typedef).

When specifying an identifier, if several symbols with this name exist, the debugger will prompt for the symbol you want to use. Pick up the one you want from its number.


minidump file.mdmp saves the debugging context of the debuggee into a minidump file called file.mdmp.

Information on Wine internals
info class

Lists all Windows classes registered in Wine

info class id

Prints information on Windows class id

info share

Lists all the dynamic libraries loaded in the debugged program (including .so files, NE and PE DLLs)

info share N

Prints information on module at address N

info regs

Prints the value of the CPU registers

info all-regs

Prints the value of the CPU and Floating Point registers

info segment

Lists all allocated segments (i386 only)

info segment N

Prints information on segment N (i386 only)

info stack

Prints the values on top of the stack

info map

Lists all virtual mappings used by the debugged program

info map N

Lists all virtual mappings used by the program of Windows pid N

info wnd

Displays the window hierarchy starting from the desktop window

info wnd N

Prints information of Window of handle N

info process

Lists all w-processes in Wine session

info thread

Lists all w-threads in Wine session

info frame

Lists the exception frames (starting from current stack frame). You can also pass, as optional argument, a thread id (instead of current thread) to examine its exception frames.

Debug messages can be turned on and off as you are debugging using the set command, but only for channels initialized with the WINEDEBUG environment variable.
set warn + 

Turns on warn on win channel

set + win

Turns on warn/fixme/err/trace on win channel

set - win

Turns off warn/fixme/err/trace on win channel

set fixme - all

Turns off fixme class on all channels

Gdb mode:
See the gdb documentation for all the gdb commands.

However, a few Wine extensions are available, through the monitor command:
monitor wnd

Lists all windows in the Wine session

monitor proc

Lists all processes in the Wine session

monitor mem

Displays memory mapping of debugged process

Auto and minidump modes:
Since no user input is possible, no commands are available.



When used in gdb proxy mode, WINE_GDB specifies the name (and the path) of the executable to be used for gdb. "gdb" is used by default.


The first version was written by Eric Youngdale.

See Wine developers list for the rest of contributors.


Bugs can be reported on the ("") Wine bug tracker.


winedbg is part of the Wine distribution, which is available through WineHQ, the ("") Wine development headquarters.


("") Wine documentation and support.


Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.

Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.

Free Software

Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.

Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.

Free Books

The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.

Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.


Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.

Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.