Отладчик gdb для windows

Exploring GDB

Introduction

No matter how big or small the codebase is, errors and bugs are inevitable. So as a developer we should know how to fix them. But, even before fixing an error, we have a more daunting task. Can you guess it? Yes, finding where the error is in the first place.

Debugging is the process of detecting and removing existing and potential errors (also called ‘bugs’) in a software code.

In our day-to-day programming scenarios, we often use the print statements (like console.log()) to debug. But imagine this scenario. You are working on a large codebase and compiling the entire code takes like 3-4 mins. Now if you are stuck somewhere and you add a print statement you have to recompile the code. And if you keep doing that repeatedly, you will have to recompile the code every single time you make a change. This is too inefficient and a huge waste of time.

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This is where Debuggers come to the rescue. In this article, we will look at GDB.

What is GDB?

GDB (GNU Debugger) is a debugger for C and C++.

GDB allows you to do things like run the program up to a certain point then stop and print out the values of certain variables at that point, or step through the program one line at a time and print out the values of each variable after executing each line.

GDB uses a command-line interface which might be intimidating at first but once you get used to the commands it becomes very easy to use. We will explore some of the basic commands in this article.

Let’s start with installing gdb first.

Installing GDB

If you are using Linux, you probably already have gdb, but if you are using Windows, you will need to install it.

Check if you already have gdb installed by running the following command in your terminal:

gdb --version # if you are in a Unix based system

c:\mingw\bin\gdb.exe --version # if you are in windows

Linux

You can install gdb on Debian-based Linux distro (e.g. Ubuntu, Mint, etc) by the following command.

sudo apt-get update
sudo apt-get install gdb

Windows

If you have MinGW installed then you already have gdb. Otherwise, download the latest MinGW installer from here.

• Install MinGW from the installer.
• Run the «MinGW Installation Manager» (which might be located in C:\MinGW\libexec\mingw-get\guimain.exe )
• Make sure that the mingw32-gdb bin package is installed.

After installation is complete, check the version once again with the commands above. Let’s get started with debugging a simple program now.

NOTE: GDB is good but it isn’t very fancy, so instead you can use GDB-GEF. It’s very easy to install. I will be using GEF throughout this article and you should use it too.

Starting GDB

To debug we need to have some code. Let’s write a simple program to calculate factorial in C.

#include <stdio.h>

const int MAX_FACTORIAL = 20;

int factorial(int n) {
  int res = 1;
  for (int i = 1; i <= n; i++) {
    res = res * i;
  }
  return res;
}

int main() {
  int val;
  printf("Enter a number: ");
  scanf("%d", &val);
  printf("Factorial of %d is %d\n", val, factorial(val));
  return 0;
}

Let’s compile the code:

gcc main.c -o factorial

Now, let’s run gdb on the binary file factorial. We do that by the gdb program command.

gdb factorial

Do you see some errors like this?

Reading symbols from factorial...
(No debugging symbols found in factorial)

To quit gdb press Ctrl+C.

This is because to prepare our program for debugging with gdb, we must compile it with the -g flag. So, let’s recompile our program this time with the -g flag.

gcc -g main.c -o factorial
gdb factorial

Now, we don’t see the error (No debugging symbols found in factorial) anymore. So now we can use gdb to debug our code.

What gdb did under the hood is that it automatically loaded the symbol table. We will look into Symbol Table later.

Breakpoint

A breakpoint is a spot in your program where you would like to temporarily stop execution in order to check the values of variables, or to try to find out where the program is crashing, etc. To set a breakpoint you use the break command.

Remember: Almost all the commonly used gdb commands have a shorter version and we should use them heavily to improve speed.

break main
# OR a shorter version
b main

Output:

gef➤  b main
Breakpoint 1 at 0x117f: file main.c, line 15.

This means we have set a breakpoint at the main function so that as soon as the instruction pointer reaches the main function it will stop the execution and wait for our commands.

To see the list of all the breakpoints use the command info break. As the command name suggests it will give us information about all the breakpoints we have set.

gef➤  info break
Num     Type           Disp Enb Address            What
1       breakpoint     keep y   0x000000000000117f in main at main.c:15

There is an index associated with each breakpoint. These index values will be used if you want to delete a breakpoint or disable it. First, let’s run the program with the breakpoint set. To run, use the run command (or just r as a shorter version).

gef➤  run
// OR
gef➤  r

You will see the program execution stopped. Let’s just resume the execution with the command continue (or just c).

gef➤  c
Continuing.
Enter a number: 5
Factorial of 5 is 120
[Inferior 1 (process 128334) exited normally]

You will notice it will prompt for the number and then display the factorial of that number and exit normally. Why? Because there were no other breakpoints in our code and execution hence didn’t stop anywhere else.

Sometimes, we don’t need to stop at a breakpoint so we can disable it. To disable a breakpoint use the disable command.

gef➤  info break
Num     Type           Disp Enb Address            What
1       breakpoint     keep y   0x000000000000117f in main at main.c:15
gef➤  disable 1
gef➤  info break
Num     Type           Disp Enb Address            What
1       breakpoint     keep n   0x000000000000117f in main at main.c:15

Once, disabled you can notice the value under Enb is not y anymore. It’s n representing it’s not enabled anymore. If you run the program now, you will notice that it didn’t stop at any place. This is because the breakpoint is disabled.

gef➤  r
Starting program: /home/arnab/Desktop/SWE-Lab/ass2/prog/factorial
Enter a number: 5
Factorial of 5 is 120
[Inferior 1 (process 411121) exited normally]

Sometimes, we add a breakpoint to a function inside the loop. And we don’t want to stop for every iteration of the loop. In that scenario, we can ignore the breakpoint for a fixed number of times using the ignore command. Let’s try that. We have a loop in our factorial() function. Let’s add a breakpoint to the loop.

TIP: You can see the code of a function directly from the gdb terminal using the list command. So do list factorial and it will display the source code of factorial().

We want to set the breakpoint at line 8 of this main.c file. So, we will use the command b main.c:8.

gef➤  info break  # to list our breakpoints
Num     Type           Disp Enb Address            What
1       breakpoint     keep n   0x000000000000117f in main at main.c:15
gef➤  list factorial # to see the source code
1 #include <stdio.h>
2
3 const int MAX_FACTORIAL = 20;
4
5 int factorial(int n) {
6   int res = 1;
7   for (int i = 1; i <= n; i++) {
8     res = res * I;  # <-- breakpoint here
9   }
10   return res;
11 }

gef➤  b main.c:8 # add breakpoint to line 8 of main.c
Breakpoint 2 at 0x115c: file main.c, line 8.
gef➤  info break # to check if the breakpoint was added
Num     Type           Disp Enb Address            What
1       breakpoint     keep n   0x000000000000117f in main at main.c:15
2       breakpoint     keep y   0x000000000000115c in factorial at main.c:8

Now, if you run the program with the r command. It will prompt you for a number (enter something like 5). You will then see it hits the breakpoint at the factorial() function (Remember we disabled the breakpoint at the main() function). Type the command continue or c and it will again hit the same point. Cause not we are now inside a loop. Keep doing this 5 times. Finally, when the loop ends you will notice the factorial result is displayed.

In this scenario, if we want to ignore the breakpoint for the first 4 times maybe. We will use the ignore <index of breakpoint> 4 command.

gef➤  info break
Num     Type           Disp Enb Address            What
1       breakpoint     keep n   0x000055555555517f in main at main.c:15
2       breakpoint     keep y   0x000055555555515c in factorial at main.c:8
 breakpoint already hit 5 times
gef➤  ignore 2 4
Will ignore next 4 crossings of breakpoint 2.
gef➤  info break
Num     Type           Disp Enb Address            What
1       breakpoint     keep n   0x000055555555517f in main at main.c:15
2       breakpoint     keep y   0x000055555555515c in factorial at main.c:8
 breakpoint already hit 5 times
 ignore next 4 hits

Let’s run the program. This time when it prompts for a number, we will enter 5. After that, it will hit the breakpoint at the factorial() function. Press c to continue, and the program ends. This is because gdb ignored the breakpoint for the first 4 times and only hit the 5-th time we hit the breakpoint.

Now, let’s delete that breakpoint using the command delete breakpoints <index>.

gef➤  info break
Num     Type           Disp Enb Address            What
1       breakpoint     keep n   0x000055555555517f in main at main.c:15
2       breakpoint     keep y   0x000055555555515c in factorial at main.c:8
 breakpoint already hit 5 times
gef➤  delete 2
gef➤  info break
Num     Type           Disp Enb Address            What
1       breakpoint     keep n   0x000055555555517f in main at main.c:15
gef➤  delete 1
gef➤  info break
No breakpoints or watchpoints.

Symbol Table

Have you ever wondered how a compiler remembers which data structure is of which type and so on?
Well, the answer is Symbol Table. It is a data structure used by a compiler to keep track of semantics of variable names like:

• Data type of the variable.
• When is used: scope (The effective context where a name is valid).
• Where it is stored: storage address.

In gdb, when you run gdb factorial it will load the symbol table. Let’s quit the gdb now by pressing Ctrl+C or typing q and Enter. This time just run gdb.

To load a program and its symbol table use the command file <program>.

gef➤  file ./prog/factorial
Reading symbols from ./prog/factorial...

Now that it has read the symbols, we can interact with them. Run the command info address <symbol name> to see the address of that symbol.

gef➤  info address main
Symbol "main" is a function at address 0x1177.
gef➤  info address factorial
Symbol "factorial" is a function at address 0x1145.
gef➤  info address MAX_FACTORIAL
Symbol "MAX_FACTORIAL" is static storage at address 0x2004.

Now since you know the address you can reverse lookup the symbol name with the command info symbol <address>.

gef➤  info symbol 0x1177
main in section .text
gef➤  info symbol 0x1145
factorial in section .text

The best part of this info symbol is that if you don’t specify the exact address, show the offset from the beginning of the symbol. So in my case, the main symbol is at address 0x1177. So let’s try to see what the symbol name of the address 0x1180.

gef➤  info symbol 0x1180
main + 9 in section .text

Now, remember we had a variable called val in main. Let’s see the address of that.

gef➤  info address val
No symbol "val" in current context.

This means we are not in the correct scope yet. Because the variable val was declared inside the main() function, we cannot access it outside the main() function. So let’s set a breakpoint at the main and run the program and then we will see the address of val in the symbol table.

gef➤  b main
Breakpoint 1 at 0x117f: file main.c, line 15.
gef➤  r
gef➤  info address val
Symbol "val" is a complex DWARF expression:
     0: DW_OP_fbreg -20
.

To see the list of all the functions in the symbol table use the command info func. You can also filter the functions with regexes. Let’s search for our factorial function. The exact regex match will be ^facorial$.

gef➤  info func ^factorial$
All functions matching regular expression "^factorial$":

File main.c:
5: int factorial(int);

We can do the same for global variables using the command info var. Let’s look for our global variable MAX_FACTORIAL.

gef➤  info var ^MAX_FACTORIAL$
All variables matching regular expression "^MAX_FACTORIAL$":

File main.c:
3: const int MAX_FACTORIAL;

The symbol table also stores the type of the variable. We can use the command whatis <variable name> to see the type of the variable.

gef➤  whatis MAX_FACTORIAL
type = const int
gef➤  whatis val
type = int

Working with Variables

So far we have seen how to set breakpoints, run the program and get the symbol table. Now let’s see how to work with variables. Most of the time we don’t need all the global variables rather want to see the local variables. For that, we have the command info locals which will show us the local variables.

First, let’s set a breakpoint after the scanf statement (which is line number 17 in main.c file). So run:

gef➤  b main.c:17
Breakpoint 2 at 0x11a8: file main.c, line 17.

If the program is not running press r (to run) otherwise press c (to continue). It will show the prompt Enter a number: to which you should type a value and the program will reach another breakpoint.

Now run the command to get the local variables.

gef➤  info locals
val = 0xa

It says the value of the variable val is 0xa. We can also print the values with the command print (or just p).

gef➤  p val
$1 = 0xa
gef➤  p/d val
$2 = 10

By default, the value will be in hex, but we can specify /d to display in decimal. Here are other formats:

We can also set the variable values, using the set variable command.

gef➤  set variable val=5
gef➤  p/d val
$3 = 5

Functions

Functions play an important role in programs. So, let’s see how gdb handles them. In our code, we have two functions main and factorial. So, let’s start with setting a breakpoint at main.

gef➤  b main
Breakpoint 1 at 0x117f: file main.c, line 15.
gef➤  info break
Num     Type           Disp Enb Address            What
1       breakpoint     keep y   0x000000000000117f in main at main.c:15

Run the program with r. GDB will stop execution at the first line of the function main. Before moving ahead, let’s try to understand the difference between this next command and another very similar command called stepi.

• next: execute next line, including any function calls.
• stepi: step by machine instructions rather than source lines

So, at any point, if we are at a function call, do si (step into) to enter the function.

TIP : You can use a count with next or stepi to perform the command multiple times.

We will perform next 2 i.e next twice. This time you will be prompted for a number. After that, we will step into the instruction that will take us to the factorial function.

gef➤  r
gef➤  n 2 // we will be in that line where factorial is called
gef➤  si 3 // we will be in the factorial function
gef➤  n // the first line of the factorial function

We are doing si 3 because, si steps one instruction at a time, so to go through the function prologue we have to do it thrice.

Now, to see the function arguments we will again use the info command. This time with args. So perform info args.

gef➤  info args
n = 0xa
gef➤  p/d n
$1 = 10

If you know the name of the function argument then we can use the print command to print the value of that argument as well.

Program Stack

Since, we are inside the function factorial() which was called from main() so if we return from factorial() we will be back in main(). For a simple program like this, it’s not much of a big deal to remember which function is called by whom. But for a large codebase, it becomes difficult to keep track of it. So we have a command called backtrace that shows us exactly this.

gef➤  backtrace
#0  factorial (n=0xa) at main.c:6
#1  0x00005555555551b2 in main () at main.c:17

This very clearly tells us that we left main() on line 17 and now we are in factorial() on line 6.

Cheatsheet

Final Notes

Even though there is still a lot more to cover this article should give a basic understanding of how the debugger GDB works. If you are working with a large codebase you will have no option but to use debuggers like GDB. If properly used, these tools make your life a lot easier.

Also, if you are a CTF player you might have come across Binary Exploitation challenges where again the only way to get the flag is by debugging the code and understanding the binary. There are more to GDB, like looking up the registers, finding a variable in a stack, watchpoints, threads, etc but those will be covered in later articles.

I am a college undergrad who is constantly learning. If you have any feedback feel free to put it in the comments. I would really appreciate that. Also, feel free to contact me through any of these social handles (mainly active on Twitter):

• Twitter @ArnabSen1729
• LinkedIn arnabsen1729
• Github arnabsen1729
• Gmail
• Peerlist.io
• arnabsen.bio.link

GDB is the GNU Debugger. It can be used to get information about crashes, including backtraces, which can be very helpful to the programmers when you report bugs.

getting a debug build of the OHRRPGCE[edit]

The latest debug build of the OHRRPGCE is available here: ohrrpgce-wip-directx-sdl-debug.zip. When used together with gdb, it can provide useful information about crashes.

Installing gdb[edit]

If you are using Linux, you probably already have gdb, but if you are using Windows, you will need to install it.

MinGW distributes a Windows version of gdb. You can get the latest mingw installer here which can in turn install gdb.
After installing MinGW, run the «MinGW Installation Manager» (which for me was located in C:\MinGW\libexec\mingw-get\guimain.exe ) and then make sure that the mingw32-gdb bin package is installed.
(These instructions are for mingw32, not the mingw-w64 fork. But gdb from mingw-w64 should work too.)

Starting gdb[edit]

gdb will not show up in your start menu. It is a command-line program. From a command-line prompt, you can type:

c:\mingw\bin\gdb.exe program_to_debug.exe

Or you can create a batch file with the same command in it. There is already a pair of pre-made batch files for debugging the OHRRPGCE.

C:\OHRRPGCE\gdbgame.bat

C:\OHRRPGCE\gdbcustom.bat

See Also[edit]

• OHRRPGCE Source Code
• Freedroid’s GDB-on-Windows documentation

In this blog we will see how we can:

• Install updated version of C/C++ Compiler using MSYS2
• Install Debugger
• Install Visual Studio Code (VSC) IDE
• Integrate GCC compiler and debugger with Visual Studio Code (VSC)

All steps are shown in this YouTube video.

The GCC Compiler and MinGW:

The C and C++ compiler is the GCC Compiler. To install GCC, we can install MinGW. MinGW stands for Minimalist GNU for Windows. It’s a free and open-source software development environment specifically designed to create native Microsoft Windows applications.

So, we will install MinGW that has the GCC compiler as part of it. We can install MinGW directly from the website but we will install this using MSYS2. MSYS2 is a software installation and building platform for Windows.

Why to use MSYS2 to install MinGW?

In simple words it makes the installation process simple and handles the dependencies and updates with no effort. It uses the package manager named as pacman.

• MSYS2 uses Pacman, a powerful package manager, to install MinGW and its dependencies effortlessly
• MSYS2 handles dependencies automatically, ensuring that all required packages are installed correctly.

To install MSYS2, go to this link:

https://www.msys2.org/

• Under the “Installation” section, click the Installer to download that.
• Follow the steps for the installation process.
• It will be installed in C drive C:\msys64

MSYS2 provides a command-based interface. When you run the installed program it will open the command window something like this:

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The first command will be using pacman to update the System. This will update system’s package database and upgrade all out-of-date packages. Use this command:

$ pacman -Syu

It will ask for yes or no as [Y/n], then press Y.

Now to install MinGW for 64 Bit system, use this command:

$ pacman -S mingw-w64-x86_64-gcc

It will ask for yes or no as [Y/n], then press Y.

After this step MinGW will be installed. If there is any error at the end, you may need to repeat the process.

Verify if MinGW and GCC Compiler has been installed:

First exit from the MSYS2 command window. For that, simply use the Exit command to exit from MSYS2 as:

$ exit

Now from the Windows start menu, search for MSYS2 MinGW 64. If you find that it means MinGW has been installed. Click that to open the MSYS2 command window again. We can verify if GCC compiler is installed successfully. For that, use the command:

$ gcc –version

And we should get the information about GCC with version number

Installation of GDB Debugger:

While coding in C and C++ we should also install the debugger which is a powerful tool to find and fix errors in the code. We will install GDB which stands for GNU Debugger.

For that, we will use this command in MSYS2 command window:

$ pacman -S mingw-w64-x86_64-gdb

It will ask for yes or no as [Y/n], then press Y.

To verify if the debugger has been installed successfully, use the following command:

$ gdb –version

You must see the version information in the output. Everything has been installed and we can simply exit the MSYS2 using the exit command.

Setting up Windows System Variables:

There is one last crucial step before we can start writing code, and that is making the GCC compiler accessible throughout your system. This means you can use the GCC compiler from any directory without specifying its full path. For that we need to open the command prompt of windows by going to Windows Search bar and typing CMD. It will open the command prompt as:

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To verify if GCC is accessible here, write the command

> gcc –version

Most probably you will get the error like:

‘gcc’ is not recognized as an internal or external command,

The reason is that MSYS2 was installed in the Drive C. Locate that folder:

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Inside msys64 folder, we have the folder for mingw64 –> bin  and inside bin folder we have all exe applications like gcc and gdb. So we need to tell the Windows about this path so that when we will run the codes, it knows where to find the compiler GCC. Copy the path: C:\msys64\mingw64\bin.

Now go to Windows Search bar and search for “Environment Variables” and click “Edit the system environment variables”. This window will open:

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Click “Environment Variables” at the bottom of the above window. A new window will open and we need to edit the path variable in the lower section:

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Select the Path variable and Click “Edit” to edit it. This window will open:

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Here click “New” to add a new path and paste the path C:\msys64\mingw64\bin. Then Click “OK” a couple of times.

Now you can open the command prompt again (using CMD in Windows search bar) and verify the installation of GCC and GDB with these commands:

> gcc –version

And

>> gdb –version

And this time instead of error you should get the version information.

C/C++ compiler and debugger has been installed.

Installation of Visual Studio Code and integrating GCC:

For the better and professional experience we can install the IDE “Visual Studio Code” and configure it for C and C++. This offers a rich set of features for code editing, debugging, IntelliSense, and project management, significantly enhancing productivity and code quality.

Let’s see how we can install and configure Visual Studio Code.

Go to this link: https://code.visualstudio.com/ And click “Download for Windows”

Choose the operating system as Windows 10 and 11 and installer download will start. Run the installer and follow the steps to install Visual Studio Code.

To install C/C++ support, go to Extension and then search for C/C++. And install the first extension you see.

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You should also install another extension “Code Runner” which offers a bunch of useful features. The detail is provided in THISSSSSSSSSSSSSSSSSSSSS video.

Test C and C++ Codes:

To finally verify the execution of C and C++ programs, open some directory in Visual Studio Code, where you want to save the coding files. Create a new file for the C program and use the extension C (e.g. test.c). Test this simple Hello World program:

#include <stdio.h>

int main() {

printf(“Hello, World!\n”);

return 0;

}

You should see the output as the text Hello World.

Test another program that takes user’s input:

#include <stdio.h>

int main() {

int num;

// Prompt the user for input

printf(“Enter an integer: “);

// Read the integer input from the user

scanf(“%d”, &num);

// Calculate the square of the input number

int square = num * num;

// Print the result

printf(“The square of %d is %d\n”, num, square);

return 0;

}

You might face a problem taking input from the user. The solution is running the code in the terminal and that’s where the extension “Code Runner” we installed will help us. For that go to settings and search for “Code Runner”. Then search for the setting “Run in Terminal” and click the checkbox. Now the above code that takes input a number from the user should work correctly.

The last thing we will see is running a C++ code. No setting or configuration needs to be changed. You just need to use the extension .cpp instead of .c for the file. You can test this sample C++ program:

#include <iostream>

int main() {

int num;

// Prompt the user for input

std::cout << “Enter an integer: “;

// Read the integer input from the user

std::cin >> num;

// Calculate the square of the input number

int square = num * num;

// Print the result

std::cout << “The square of ” << num << ” is ” << square << std::endl;

return 0;

}

All steps are shown in this YouTube video.

How to Use GDB for Debugging

How do we run GDB?

Use the run command to start your program under GDB. You must first specify the program name (except on VxWorks) with an argument to GDB (see section Getting In and Out of GDB), or by using the file or exec-file command (see section Commands to specify files).

Where is the GDB path in Windows?

gdb on Windows

It may be in the same location as gcc , which for me is C:\msys64\mingw64\bin , but it may be in a different location. The gdb.exe file should be in a \bin folder somewhere within the C:\msys64 folder — you may need to search for it. Copy the address where you find the gdb.exe file.

Can you use GDB in Visual Studio?

Visual Studio Code supports the following debuggers for C/C++ depending on the operating system you are using: Linux: GDB. macOS: LLDB or GDB. Windows: the Visual Studio Windows Debugger or GDB (using Cygwin or MinGW)

Is there a GDB for Windows?

Those programs might be executing on the same machine as GDB (native), on another machine (remote), or on a simulator. GDB can run on most popular UNIX and Microsoft Windows variants, as well as on macOS.

GDB is REALLY easy! Find Bugs in Your Code with Only A Few Commands

How to add GDB to Visual Studio?

Using the debugger

Is VisualGDB free?

You can download a free fully functional trial of VisualGDB. The trial will expire in 30 days after the first run.

How do I open a GDB GUI?

A browser-based frontend to gdb (gnu debugger)

Simply run gdbgui from the terminal to start the gdbgui server, and a new tab will open in your browser. Sound Good? Get started with installation.

How to install Visual GDB?

Visual Studio Extension Files

How do I know if GDB is installed?

The below steps will get you started:

Is GDB a good debugger?

GDB, short for GNU Debugger, is a powerful and widely-used tool for debugging software. It is a command-line utility that allows programmers to interact with a program being debugged and analyze its behavior. GDB is commonly used for debugging C and C++ programs, but it can also be used with other languages.

How to use GDB remotely?

To start remote debugging, run GDB on the host machine, and specify as an executable file the program that is running in the remote machine. This tells GDB how to find your program’s symbols and the contents of its pure text. Start GDB on the host, and connect to the target (see section Connecting to a remote target).

Can I attach GDB to running process?

With GDB it is always possible to debug a running process by attaching to it. It is possible to debug a DLL this way. The limitation of this approach is that the DLL must run long enough to perform the attach operation.

How to use GDB for debugging C?

How to Debug C Program using gdb in 6 Simple Steps

How do I install Windows debugger?

To install the Debugging Tools for Windows as a standalone tool set:

What app opens GDB files?

GDB files may be opened with newer versions of the software. Embarcadero InterBase is a database application that is relatively inexpensive compared to other proprietary database products. Embarcadero offers a free trial version of the InterBase database software.

How do I run a script in GDB?

For example, if filename is d:myscript and the search path contains c:/tmp then GDB will look for the script c:/tmp/myscript . If -v , for verbose mode, is given then GDB displays each command as it is executed. The option must be given before filename , and is interpreted as part of the filename anywhere else.

What is the terminal interface for GDB?

The GDB Text User Interface, TUI in short, is a terminal interface which uses the curses library to show the source file, the assembly output, the program registers and GDB commands in separate text windows.

What is visual GDB?

VisualGDB is a powerful extension for Microsoft Visual Studio that provides advanced development tools and features for embedded systems, including support for the ESP-IDF framework.

How to use GDB debugger in VS Code?

Click and select C/C++ : (gdb) Attach option. To start debugging with VSCode, select the process name for your vehicle’s binary : example arducopter . Before or after attaching you may put breakpoints in the code to start debugging.

How do I load a library into GDB?

GDB automatically looks for shared libraries, however if GDB does not find yours, you can run add-shared-symbol-file . It takes no arguments. The section command changes the base address of section SECTION of the exec file to ADDR.

Is GDB only for C++?

Gdb is a debugger for C (and C++). It allows you to do things like run the program up to a certain point then stop and print out the values of certain variables at that point, or step through the program one line at a time and print out the values of each variable after executing each line.