Application Debugging

GDB

GDB is an open source debugger that is included in the CodeSourcery development package.

Using a terminal program such as Hyperterm to communicate with the 825 console at the “#” prompt type:

gdbserver :port progname [args] & (where port is the TCP/IP port to be used, and programe is the name of the program to be debugged)

For example:

gdbserver :10000 cardbas 788IDS.77X &

This will start the gdbserver process:

184

Process cardbas created; pid = 185

Listening on port 10000

From the PC you may then start debugging by selecting the “Debug” perspective and then clicking the “Bug” icon in Eclipse.

For example, the terminal will show:

Remote debugging from host 90.1.1.216

Breakpoints may be set by double-clicking the border just to the left of a program line in the editor.

F5 – Step Into (If stopped at a function call, this will step into the function)

F6 – Step Over (If stopped at a function call, this will step over to the next statement)

F8 – Resume (If stopped this will resume running)

The “Variables” window will automatically show the local variables that are in use.

Right-click in the “Variables” window and select “Add global Variables…” to select global variables to monitor. These will not appear until the next break.

To stop the debugging session from CodeSourcery click the red square icon. The application being debugged and the gdbserver will automatically exit.

The terminal window will show:

Killing inferior

It is also possible to set gdbserver to attach to an already executing process.

Determine the existing process ID first by using the PS command.

gdbserver :port – attach pid & (where port is the TCP/IP port number and pid is the process ID)

For example:

gdbserver :10000 –attach 187 &

When using the attach method stopping the debugging session from Eclipse may not stop gdbserver or the application.