Moxa W406-T-CE [59/74] On line debugging with gdb

W315A/325A Linux User's Manual Development Tool Chains

5-3

On-Line Debugging with GDB

The tool chain also provides an on-line debugging mechanism to help you develop your program. Before

performing a debugging session, add the option -ggdb to compile the program. A debugging session runs on

a client-server architecture on which the server

gdbserver is installed in the target computer and the client

ddd is installed in the host computer. To illustrate, we’ll assume that you have uploaded a program named

hello-debug to the target computer and have started debugging the program.

1. Log on to the target computer and run the debugging server program.

#gdbserver 192.168.4.142:2000 hello-debug

Process hello-debug created; pid=38

The debugging server listens for connections at network port 2000 from the network interface

192.168.4.142. The name of the program to be debugged follows these parameters. For a program

requiring arguments, add the arguments behind the program name.

2. On the host computer, change the directory to where the program source code resides.

cd /my_work_directory/myfilesystem/testprograms

3. Execute the client program.

#ddd --debugger arm-linux-gdb hello-debug &

4. Enter the following command at the GDB, DDD command prompt.

Target remote 192.168.4.99:2000

The command produces a line of output on the target console, similar to the following.

Remote debugging using 192.168.4.99:2000

192.168.4.99 is the machine’s IP address, and 2000 is the port number. You can now begin debugging in

the host environment using the interface provided by DDD.

5. Set a break point on main by double clicking, or by entering b main on the command line.

When finished, click the cont button.