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