70 lines
3.0 KiB
HTML
70 lines
3.0 KiB
HTML
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<title>BPF-Regs - Using as</title>
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<link rel="up" href="BPF-Syntax.html#BPF-Syntax" title="BPF Syntax">
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<link rel="prev" href="BPF_002dChars.html#BPF_002dChars" title="BPF-Chars">
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<!--
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This file documents the GNU Assembler "as".
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Copyright (C) 1991-2019 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
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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Back-Cover Texts. A copy of the license is included in the
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</head>
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<body>
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<div class="node">
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<a name="BPF-Regs"></a>
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<a name="BPF_002dRegs"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="BPF_002dPseudo_002dMaps.html#BPF_002dPseudo_002dMaps">BPF-Pseudo-Maps</a>,
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Previous: <a rel="previous" accesskey="p" href="BPF_002dChars.html#BPF_002dChars">BPF-Chars</a>,
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Up: <a rel="up" accesskey="u" href="BPF-Syntax.html#BPF-Syntax">BPF Syntax</a>
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<hr>
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</div>
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<h5 class="subsubsection">9.7.2.2 Register Names</h5>
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<p><a name="index-BPF-register-names-862"></a><a name="index-register-names_002c-BPF-863"></a>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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<dl>
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<dt>‘<samp><span class="samp">%r0 .. %r9</span></samp>’<dd>General-purpose registers.
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<br><dt>‘<samp><span class="samp">%r10</span></samp>’<dd>Frame pointer register.
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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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<dl>
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<dt>‘<samp><span class="samp">%a</span></samp>’<dd>This is ‘<samp><span class="samp">%r0</span></samp>’.
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<br><dt>‘<samp><span class="samp">%ctx</span></samp>’<dd>This is ‘<samp><span class="samp">%r6</span></samp>’.
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<br><dt>‘<samp><span class="samp">%fp</span></samp>’<dd>This is ‘<samp><span class="samp">%r10</span></samp>’.
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</dl>
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</body></html>
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