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113 lines
5.8 KiB
HTML
113 lines
5.8 KiB
HTML
4 years ago
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<title>AArch64 Options - Using as</title>
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<meta name="description" content="Using as">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="AArch64_002dDependent.html#AArch64_002dDependent" title="AArch64-Dependent">
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<link rel="next" href="AArch64-Extensions.html#AArch64-Extensions" title="AArch64 Extensions">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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This file documents the GNU Assembler "as".
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Copyright (C) 1991-2015 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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section entitled ``GNU Free Documentation License''.
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-->
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<style type="text/css"><!--
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--></style>
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</head>
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<body>
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<div class="node">
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<a name="AArch64-Options"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="AArch64-Extensions.html#AArch64-Extensions">AArch64 Extensions</a>,
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Up: <a rel="up" accesskey="u" href="AArch64_002dDependent.html#AArch64_002dDependent">AArch64-Dependent</a>
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<hr>
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</div>
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<h4 class="subsection">9.1.1 Options</h4>
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<p><a name="index-AArch64-options-_0028none_0029-523"></a><a name="index-options-for-AArch64-_0028none_0029-524"></a>
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<!-- man begin OPTIONS -->
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<a name="index-g_t_0040option_007b_002dEB_007d-command-line-option_002c-AArch64-525"></a>
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<dl><dt><code>-EB</code><dd>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><a name="index-g_t_0040option_007b_002dEL_007d-command-line-option_002c-AArch64-526"></a><br><dt><code>-EL</code><dd>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><a name="index-g_t_0040option_007b_002dmabi_003d_007d-command-line-option_002c-AArch64-527"></a><br><dt><code>-mabi=</code><var>abi</var><dd>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><a name="index-g_t_0040option_007b_002dmcpu_003d_007d-command-line-option_002c-AArch64-528"></a><br><dt><code>-mcpu=</code><var>processor</var><code>[+</code><var>extension</var><code>...]</code><dd>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-a57</code>,
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<code>cortex-a72</code>,
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<code>exynos-m1</code>,
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<code>qdf24xx</code>,
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<code>thunderx</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>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>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><a name="index-g_t_0040option_007b_002dmarch_003d_007d-command-line-option_002c-AArch64-529"></a><br><dt><code>-march=</code><var>architecture</var><code>[+</code><var>extension</var><code>...]</code><dd>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> and <code>armv8.2-a</code>.
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<p>If both <samp><span class="option">-mcpu</span></samp> and <samp><span class="option">-march</span></samp> are specified, the
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assembler will use the setting for <samp><span class="option">-mcpu</span></samp>. If neither are
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specified, the assembler will default to <samp><span class="option">-mcpu=all</span></samp>.
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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><span class="option">-mcpu</span></samp> option. Unlike
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<samp><span class="option">-mcpu</span></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><a name="index-g_t_0040code_007b_002dmverbose_002derror_007d-command-line-option_002c-AArch64-530"></a><br><dt><code>-mverbose-error</code><dd>This option enables verbose error messages for AArch64 gas. This option
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is enabled by default.
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<p><a name="index-g_t_0040code_007b_002dmno_002dverbose_002derror_007d-command-line-option_002c-AArch64-531"></a><br><dt><code>-mno-verbose-error</code><dd>This option disables verbose error messages in AArch64 gas.
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</dl>
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<!-- man end -->
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</body></html>
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