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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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<title>AArch64 Options (Using as)</title>
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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="AArch64_002dDependent.html#AArch64_002dDependent" rel="up" title="AArch64-Dependent">
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<link href="AArch64-Extensions.html#AArch64-Extensions" rel="next" title="AArch64 Extensions">
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</head>
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<body lang="en">
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<a name="AArch64-Options"></a>
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<div class="header">
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<p>
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Next: <a href="AArch64-Extensions.html#AArch64-Extensions" accesskey="n" rel="next">AArch64 Extensions</a>, Up: <a href="AArch64_002dDependent.html#AArch64_002dDependent" accesskey="u" rel="up">AArch64-Dependent</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="Options"></a>
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<h4 class="subsection">9.1.1 Options</h4>
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<a name="index-AArch64-options-_0028none_0029"></a>
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<a name="index-options-for-AArch64-_0028none_0029"></a>
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<dl compact="compact">
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<dd>
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<a name="index-_002dEB-command_002dline-option_002c-AArch64"></a>
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</dd>
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<dt><code>-EB</code></dt>
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<dd><p>This option specifies that the output generated by the assembler should
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be marked as being encoded for a big-endian processor.
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</p>
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<a name="index-_002dEL-command_002dline-option_002c-AArch64"></a>
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</dd>
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<dt><code>-EL</code></dt>
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<dd><p>This option specifies that the output generated by the assembler should
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be marked as being encoded for a little-endian processor.
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</p>
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<a name="index-_002dmabi_003d-command_002dline-option_002c-AArch64"></a>
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</dd>
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<dt><code>-mabi=<var>abi</var></code></dt>
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<dd><p>Specify which ABI the source code uses. The recognized arguments
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are: <code>ilp32</code> and <code>lp64</code>, which decides the generated object
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file in ELF32 and ELF64 format respectively. The default is <code>lp64</code>.
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</p>
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<a name="index-_002dmcpu_003d-command_002dline-option_002c-AArch64"></a>
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</dd>
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<dt><code>-mcpu=<var>processor</var>[+<var>extension</var>…]</code></dt>
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<dd><p>This option specifies the target processor. The assembler will issue an error
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message if an attempt is made to assemble an instruction which will not execute
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on the target processor. The following processor names are recognized:
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<code>cortex-a35</code>,
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<code>cortex-a53</code>,
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<code>cortex-a55</code>,
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<code>cortex-a57</code>,
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<code>cortex-a72</code>,
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<code>cortex-a73</code>,
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<code>cortex-a75</code>,
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<code>cortex-a76</code>,
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<code>ares</code>,
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<code>exynos-m1</code>,
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<code>falkor</code>,
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<code>qdf24xx</code>,
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<code>saphira</code>,
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<code>thunderx</code>,
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<code>vulcan</code>,
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<code>xgene1</code>
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and
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<code>xgene2</code>.
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The special name <code>all</code> may be used to allow the assembler to accept
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instructions valid for any supported processor, including all optional
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extensions.
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</p>
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<p>In addition to the basic instruction set, the assembler can be told to
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accept, or restrict, various extension mnemonics that extend the
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processor. See <a href="AArch64-Extensions.html#AArch64-Extensions">AArch64 Extensions</a>.
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</p>
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<p>If some implementations of a particular processor can have an
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extension, then then those extensions are automatically enabled.
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Consequently, you will not normally have to specify any additional
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extensions.
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</p>
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<a name="index-_002dmarch_003d-command_002dline-option_002c-AArch64"></a>
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</dd>
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<dt><code>-march=<var>architecture</var>[+<var>extension</var>…]</code></dt>
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<dd><p>This option specifies the target architecture. The assembler will
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issue an error message if an attempt is made to assemble an
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instruction which will not execute on the target architecture. The
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following architecture names are recognized: <code>armv8-a</code>,
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<code>armv8.1-a</code>, <code>armv8.2-a</code>, <code>armv8.3-a</code>, <code>armv8.4-a</code>
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and <code>armv8.5-a</code>.
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</p>
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<p>If both <samp>-mcpu</samp> and <samp>-march</samp> are specified, the
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assembler will use the setting for <samp>-mcpu</samp>. If neither are
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specified, the assembler will default to <samp>-mcpu=all</samp>.
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</p>
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<p>The architecture option can be extended with the same instruction set
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extension options as the <samp>-mcpu</samp> option. Unlike
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<samp>-mcpu</samp>, extensions are not always enabled by default,
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See <a href="AArch64-Extensions.html#AArch64-Extensions">AArch64 Extensions</a>.
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</p>
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<a name="index-_002dmverbose_002derror-command_002dline-option_002c-AArch64"></a>
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</dd>
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<dt><code>-mverbose-error</code></dt>
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<dd><p>This option enables verbose error messages for AArch64 gas. This option
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is enabled by default.
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</p>
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<a name="index-_002dmno_002dverbose_002derror-command_002dline-option_002c-AArch64"></a>
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</dd>
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<dt><code>-mno-verbose-error</code></dt>
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<dd><p>This option disables verbose error messages in AArch64 gas.
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</p>
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</dd>
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</dl>
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<hr>
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<div class="header">
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<p>
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Next: <a href="AArch64-Extensions.html#AArch64-Extensions" accesskey="n" rel="next">AArch64 Extensions</a>, Up: <a href="AArch64_002dDependent.html#AArch64_002dDependent" accesskey="u" rel="up">AArch64-Dependent</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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</body>
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</html>
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