GDB Debugger - Tin. Can. Tools. This guide was written for Ubuntu 1. For the windows page, see Windows GDB Debugger. ![]() ![]() Getting Started with Debugging with Intel. It is also possible to use gdbserver to attach to an already running program.![]() GDB, the GNU Project Debugger is a debugging tool provided with the GNU Compiler Collection (GCC). GDB allows you to stop and start a running program, examine its functioning, and make changes. The Open. OCD Ubuntu Package also includes GDB Support. If you have installed Open. OCD according to the guides on the Compiling Open. OCD page, your version of Open. OCD already supports GDB. Open. OCD's configure script already includes the - g flag. Much of GDB's operations rely on a program's debug information. While this information generally comes from compilers, much of it is necessary only while debugging a. However, this version of GDB is only built to debug programs running on a Linux PC. You will need to download or compile a version of GDB that supports embedded devices. One such GDB build is provided with the Code. Sourcery ARM toolchain. Download the latest version of the . Save this file anywhere on your computer, then navigate to it in a terminal window. Running the program To run the program, just use. Breakpoints can be used to stop the program run in the middle, at. 3 Replay Debugging on Linux When you are ready to run the program in the guest, first begin by pressing the Record button on the. For some multi-threaded targets, gdb supports an optional mode of operation in which you can examine stopped program threads in the. Specifying a Debugging Target. If you want GDB to be able to stop your program while it is running. GDB attempts to stop the program. However, you may see an error stating that the installer doesn't support the DASH shell. Choose no and run the installer again. The installer is fairly straightforward. This guide will assume that you choose the default option on each page. Add it to your PATH by editing your environment variables. Add the following to the end of that line, inside the quotes. Code. Sourcery/Sourcery. If everything installed correctly, you will see. Starting GDBIn the terminal window, run arm- none- eabi- gdb from any directory. To connect to Open. OCD, start GDB as above. Open. OCD listens for GDB connections on port 3. In GDB, connect to Open. OCD by typing target remote localhost: 3. Don't actually type the characters (gdb).). Before doing anything else, run reset init on the target. Use the monitor command to tell GDB to send the command to Open. OCD, like this. (gdb) monitor reset init. This is important. You need to do this while GDB is connected to the Open. OCD, or you won't be able to halt or reset the target. If you don't run monitor reset init, you will encounter errors like this. Sending Commands to Open. OCDYou can send commands to Open. OCD through GDB just like you can through a telnet connection. Type monitor, then the command, then enter. You can see a list of common Open. OCD commands here. This changes the current directory only for GDB, not for Linux; when you exit GDB, you will be back in the directory where you started. This script file is named . GDB looks for it in the current working directory. Create a new folder in your home directory called GDB. Copy the code below into the file. Executing GDB with . Open. OCD.\n. echo . Press Ctrl- H in the current working directory to see it.\n. Connect to Open. OCD. Reset the target and call its init script. Halt the target. The init script should halt the target, but just in case. Save the file as . Like any file whose name begins with a period, . To see it, open the folder and press CTRL- H. To test the init script, start Open. OCD as normal. With different hardware the output of reset init will be different.). Debugging a Program on the Beagleboard. This part of the guide will demonstrate how to run and debug a simple program on the Beagleboard. The program will only work on the Beagleboard, but the commands are the same on other target devices. Install the following packages by opening a new terminal window and typing. You may see a message stating that these pachages are already installed. Navigate to /home/USERNAME/cortal. This directory contains the source for LEDblink. Run make to compile it. It also contains a hidden file called . This script should start GDB and load LEDblink, but the file is outdated and no longer works. Delete it so that you can't accidentally run it later. Run GDB, connect it to Open. OCD, and reset the Beagleboard. You can do this manually. GDB. The Beagleboard has just been reset and is halted. Tell the Beagleboard to resume to let it boot. You should see USR0 and USR1 come on. LEDblink will run forever if you let it. When you're ready to stop it, press CTRL- C in the GDB terminal. To start it again, type cont again. You can do that with GDB using breakpoints. When you ran the command symbol- file LEDblink above, you loaded a file that allows GDB to map lines and functions in the source code to instructions in the executable. You can now instruct GDB to stop the program when it reaches a particular line or function. Line 2. 2 is inside a loop that never terminates, so GDB will hit this breakpoint over and over. Each time GDB hits the breakpoint, you can tell it to proceed by typing cont again. Type. .. to create a second breakpoint at line 3. You can get a list of all breakpoints by typing. You can delete a breakpoint by entering delete followed by a number. Type x followed by a memory address to output the value at that address. GDB assumes that the address is in decimal format unless you preface it with 0x to indicate hexadecimal. Memory addresses are usually expressed in hexadecimal, so remember to type 0x.(gdb) x 0x. The values at 0x. USR0 and USR1 LEDs. The 2. 2nd bit of each (0x. USR0, and the 2. 1st bit (0x. USR1. Writing to 0x.
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