101 lines
4.4 KiB
HTML
101 lines
4.4 KiB
HTML
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<html lang="en">
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<head>
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<title>Debug Session - Debugging with GDB</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="Debugging with GDB">
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<meta name="generator" content="makeinfo 4.13">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Remote-Stub.html#Remote-Stub" title="Remote Stub">
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<link rel="prev" href="Bootstrapping.html#Bootstrapping" title="Bootstrapping">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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Copyright (C) 1988-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being ``Free Software'' and ``Free Software Needs
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Free Documentation'', with the Front-Cover Texts being ``A GNU Manual,''
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and with the Back-Cover Texts as in (a) below.
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(a) The FSF's Back-Cover Text is: ``You are free to copy and modify
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this GNU Manual. Buying copies from GNU Press supports the FSF in
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<body>
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<div class="node">
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<a name="Debug-Session"></a>
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<p>
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Previous: <a rel="previous" accesskey="p" href="Bootstrapping.html#Bootstrapping">Bootstrapping</a>,
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Up: <a rel="up" accesskey="u" href="Remote-Stub.html#Remote-Stub">Remote Stub</a>
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<hr>
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</div>
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<h4 class="subsection">20.5.3 Putting it All Together</h4>
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<p><a name="index-remote-serial-debugging-summary-1438"></a>In summary, when your program is ready to debug, you must follow these
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steps.
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<ol type=1 start=1>
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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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<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>
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<li>Insert these lines in your program's startup code, before the main
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procedure is called:
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<pre class="smallexample"> set_debug_traps();
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breakpoint();
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</pre>
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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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<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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<pre class="smallexample"> void (*exceptionHook)() = 0;
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</pre>
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<p class="noindent">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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<span class="sc">gdb</span> 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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<li>Compile and link together: your program, the <span class="sc">gdb</span> debugging stub for
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your target architecture, and the supporting subroutines.
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<li>Make sure you have a serial connection between your target machine and
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the <span class="sc">gdb</span> host, and identify the serial port on the host.
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<li><!-- The "remote" target now provides a `load' command, so we should -->
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<!-- document that. FIXME. -->
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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>Start <span class="sc">gdb</span> 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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</ol>
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</body></html>
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