| 1 | = Application Debugging = |
| 2 | == GDB == |
| 3 | |
| 4 | GDB is an open source debugger that is included in the !CodeSourcery development package. |
| 5 | |
| 6 | Using a terminal program such as Hyperterm to communicate with the 825 console at the “#” prompt type: |
| 7 | |
| 8 | 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) |
| 9 | |
| 10 | For example: |
| 11 | |
| 12 | gdbserver :10000 cardbas 788IDS.77X & |
| 13 | |
| 14 | This will start the gdbserver process: |
| 15 | |
| 16 | 184 |
| 17 | |
| 18 | Process cardbas created; pid = 185 |
| 19 | |
| 20 | Listening on port 10000 |
| 21 | |
| 22 | From the PC you may then start debugging by selecting the “Debug” perspective and then clicking the “Bug” icon in Eclipse. |
| 23 | |
| 24 | For example, the terminal will show: |
| 25 | |
| 26 | Remote debugging from host 90.1.1.216 |
| 27 | |
| 28 | Breakpoints may be set by double-clicking the border just to the left of a program line in the editor. |
| 29 | |
| 30 | F5 – Step Into (If stopped at a function call, this will step into the function) |
| 31 | |
| 32 | F6 – Step Over (If stopped at a function call, this will step over to the next statement) |
| 33 | |
| 34 | F8 – Resume (If stopped this will resume running) |
| 35 | |
| 36 | The “Variables” window will automatically show the local variables that are in use. |
| 37 | |
| 38 | 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. |
| 39 | |
| 40 | To stop the debugging session from !CodeSourcery click the red square icon. The application being debugged and the gdbserver will automatically exit. |
| 41 | |
| 42 | The terminal window will show: |
| 43 | |
| 44 | Killing inferior |
| 45 | |
| 46 | It is also possible to set gdbserver to attach to an already executing process. |
| 47 | |
| 48 | Determine the existing process ID first by using the PS command. |
| 49 | |
| 50 | gdbserver :''port'' – attach ''pid'' & (where ''port ''is the TCP/IP port number and ''pid ''is the process ID) |
| 51 | |
| 52 | For example: |
| 53 | |
| 54 | gdbserver :10000 –attach 187 & |
| 55 | |
| 56 | When using the attach method stopping the debugging session from Eclipse may not stop gdbserver or the application. |