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| <h4 class="subsection">20.5.3 Putting it All Together</h4> |
| |
| <p><a name="index-remote-serial-debugging-summary-1438"></a>In summary, when your program is ready to debug, you must follow these |
| steps. |
| |
| <ol type=1 start=1> |
| <li>Make sure you have defined the supporting low-level routines |
| (see <a href="Bootstrapping.html#Bootstrapping">What You Must Do for the Stub</a>): |
| <pre class="display"> <code>getDebugChar</code>, <code>putDebugChar</code>, |
| <code>flush_i_cache</code>, <code>memset</code>, <code>exceptionHandler</code>. |
| </pre> |
| <li>Insert these lines in your program's startup code, before the main |
| procedure is called: |
| |
| <pre class="smallexample"> set_debug_traps(); |
| breakpoint(); |
| </pre> |
| <p>On some machines, when a breakpoint trap is raised, the hardware |
| automatically makes the PC point to the instruction after the |
| breakpoint. If your machine doesn't do that, you may need to adjust |
| <code>handle_exception</code> to arrange for it to return to the instruction |
| after the breakpoint on this first invocation, so that your program |
| doesn't keep hitting the initial breakpoint instead of making |
| progress. |
| |
| <li>For the 680x0 stub only, you need to provide a variable called |
| <code>exceptionHook</code>. Normally you just use: |
| |
| <pre class="smallexample"> void (*exceptionHook)() = 0; |
| </pre> |
| <p class="noindent">but if before calling <code>set_debug_traps</code>, you set it to point to a |
| function in your program, that function is called when |
| <span class="sc">gdb</span> continues after stopping on a trap (for example, bus |
| error). The function indicated by <code>exceptionHook</code> is called with |
| one parameter: an <code>int</code> which is the exception number. |
| |
| <li>Compile and link together: your program, the <span class="sc">gdb</span> debugging stub for |
| your target architecture, and the supporting subroutines. |
| |
| <li>Make sure you have a serial connection between your target machine and |
| the <span class="sc">gdb</span> host, and identify the serial port on the host. |
| |
| <li><!-- The "remote" target now provides a `load' command, so we should --> |
| <!-- document that. FIXME. --> |
| Download your program to your target machine (or get it there by |
| whatever means the manufacturer provides), and start it. |
| |
| <li>Start <span class="sc">gdb</span> on the host, and connect to the target |
| (see <a href="Connecting.html#Connecting">Connecting to a Remote Target</a>). |
| |
| </ol> |
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