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93 lines
4.3 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<title>GDB (Embed with GNU)</title>
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<meta name="description" content="GDB (Embed with GNU)">
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<meta name="keywords" content="GDB (Embed with GNU)">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="leds_002ec.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="index.html#Top" rel="up" title="Top">
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<link href="GNU-remote-protocol.html#GNU-remote-protocol" rel="next" title="GNU remote protocol">
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<link href="Debugging.html#Debugging" rel="prev" title="Debugging">
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<a name="GDB"></a>
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<div class="header">
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<p>
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Next: <a href="Binutils.html#Binutils" accesskey="n" rel="next">Binutils</a>, Previous: <a href="Libraries.html#Libraries" accesskey="p" rel="prev">Libraries</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<a href="leds_002ec.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>]</p>
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</div>
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<hr>
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<a name="Writing-a-new-GDB-backend"></a>
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<h2 class="chapter">4 Writing a new GDB backend</h2>
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<p>Typically, either the low-level I/O routines are used for debugging, or
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LEDs, if present. It is much easier to use GDb for debugging an
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application. There are several different techniques used to have GDB work
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remotely. Commonly more than one kind of GDB interface is used to cober
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a wide variety of development needs.
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</p>
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<p>The most common style of GDB backend is an exception handler for
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breakpoints. This is also called a <em>gdb stub</em>, and is requires the
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two additional lines of init code in your <code>main()</code> routine. The GDB
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stubs all use the GDB <em>remote protocol</em>. When the application gets a
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breakpoint exception, it communicates to GDB on the host.
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</p>
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<p>Another common style of interfacing GDB to a target is by using an
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existing ROM monitor. These break down into two main kinds, a similar
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protocol to the GDB remote protocol, and an interface that uses the ROM
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monitor directly. This kind has GDB simulating a human operator, and all
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GDB does is work as a command formatter and parser.
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</p>
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<table class="menu" border="0" cellspacing="0">
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<tr><td align="left" valign="top">• <a href="GNU-remote-protocol.html#GNU-remote-protocol" accesskey="1">GNU remote protocol</a>:</td><td> </td><td align="left" valign="top">The standard remote protocol.
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Exception-handler.html#Exception-handler" accesskey="2">Exception handler</a>:</td><td> </td><td align="left" valign="top">A linked in exception handler.
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</td></tr>
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<tr><td align="left" valign="top">• <a href="ROM-monitors.html#ROM-monitors" accesskey="3">ROM monitors</a>:</td><td> </td><td align="left" valign="top">Using a ROM monitor as a backend.
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Other-remote-protocols.html#Other-remote-protocols" accesskey="4">Other remote protocols</a>:</td><td> </td><td align="left" valign="top">Adding support for new protocols.
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</td></tr>
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</table>
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</body>
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</html>
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