106 lines
4.0 KiB
HTML
106 lines
4.0 KiB
HTML
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<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Using as: BPF-Regs</title>
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<link href="index.html#Top" rel="start" title="Top">
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<link href="AS-Index.html#AS-Index" rel="index" title="AS Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="BPF-Syntax.html#BPF-Syntax" rel="up" title="BPF Syntax">
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<link href="BPF_002dPseudo_002dMaps.html#BPF_002dPseudo_002dMaps" rel="next" title="BPF-Pseudo-Maps">
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="BPF_002dRegs"></a>
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<div class="header">
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<p>
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Next: <a href="BPF_002dPseudo_002dMaps.html#BPF_002dPseudo_002dMaps" accesskey="n" rel="next">BPF-Pseudo-Maps</a>, Previous: <a href="BPF_002dChars.html#BPF_002dChars" accesskey="p" rel="previous">BPF-Chars</a>, Up: <a href="BPF-Syntax.html#BPF-Syntax" accesskey="u" rel="up">BPF Syntax</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Register-Names-5"></a>
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<h4 class="subsubsection">9.7.2.2 Register Names</h4>
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<a name="index-BPF-register-names"></a>
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<a name="index-register-names_002c-BPF"></a>
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<p>The eBPF processor provides ten general-purpose 64-bit registers,
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which are read-write, and a read-only frame pointer register:
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</p>
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<dl compact="compact">
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<dt>‘<samp>%r0 .. %r9</samp>’</dt>
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<dd><p>General-purpose registers.
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</p></dd>
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<dt>‘<samp>%r10</samp>’</dt>
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<dd><p>Frame pointer register.
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</p></dd>
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</dl>
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<p>Some registers have additional names, to reflect their role in the
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eBPF ABI:
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</p>
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<dl compact="compact">
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<dt>‘<samp>%a</samp>’</dt>
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<dd><p>This is ‘<samp>%r0</samp>’.
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</p></dd>
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<dt>‘<samp>%ctx</samp>’</dt>
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<dd><p>This is ‘<samp>%r6</samp>’.
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</p></dd>
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<dt>‘<samp>%fp</samp>’</dt>
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<dd><p>This is ‘<samp>%r10</samp>’.
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</p></dd>
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</dl>
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</body>
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</html>
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