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| <a name="AArch64-Options"></a> |
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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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| <a name="Options"></a> |
| <h4 class="subsection">9.1.1 Options</h4> |
| <a name="index-AArch64-options-_0028none_0029"></a> |
| <a name="index-options-for-AArch64-_0028none_0029"></a> |
| |
| <dl compact="compact"> |
| <dd> |
| <a name="index-_002dEB-command-line-option_002c-AArch64"></a> |
| </dd> |
| <dt><code>-EB</code></dt> |
| <dd><p>This option specifies that the output generated by the assembler should |
| be marked as being encoded for a big-endian processor. |
| </p> |
| <a name="index-_002dEL-command-line-option_002c-AArch64"></a> |
| </dd> |
| <dt><code>-EL</code></dt> |
| <dd><p>This option specifies that the output generated by the assembler should |
| be marked as being encoded for a little-endian processor. |
| </p> |
| <a name="index-_002dmabi_003d-command-line-option_002c-AArch64"></a> |
| </dd> |
| <dt><code>-mabi=<var>abi</var></code></dt> |
| <dd><p>Specify which ABI the source code uses. The recognized arguments |
| are: <code>ilp32</code> and <code>lp64</code>, which decides the generated object |
| file in ELF32 and ELF64 format respectively. The default is <code>lp64</code>. |
| </p> |
| <a name="index-_002dmcpu_003d-command-line-option_002c-AArch64"></a> |
| </dd> |
| <dt><code>-mcpu=<var>processor</var>[+<var>extension</var>…]</code></dt> |
| <dd><p>This option specifies the target processor. The assembler will issue an error |
| message if an attempt is made to assemble an instruction which will not execute |
| on the target processor. The following processor names are recognized: |
| <code>cortex-a53</code>, |
| <code>cortex-a57</code>, |
| <code>thunderx</code>, |
| and |
| <code>xgene-1</code>. |
| The special name <code>all</code> may be used to allow the assembler to accept |
| instructions valid for any supported processor, including all optional |
| extensions. |
| </p> |
| <p>In addition to the basic instruction set, the assembler can be told to |
| accept, or restrict, various extension mnemonics that extend the |
| processor. See <a href="AArch64-Extensions.html#AArch64-Extensions">AArch64 Extensions</a>. |
| </p> |
| <p>If some implementations of a particular processor can have an |
| extension, then then those extensions are automatically enabled. |
| Consequently, you will not normally have to specify any additional |
| extensions. |
| </p> |
| <a name="index-_002dmarch_003d-command-line-option_002c-AArch64"></a> |
| </dd> |
| <dt><code>-march=<var>architecture</var>[+<var>extension</var>…]</code></dt> |
| <dd><p>This option specifies the target architecture. The assembler will |
| issue an error message if an attempt is made to assemble an |
| instruction which will not execute on the target architecture. The |
| only value for <var>architecture</var> is <code>armv8-a</code>. |
| </p> |
| <p>If both <samp>-mcpu</samp> and <samp>-march</samp> are specified, the |
| assembler will use the setting for <samp>-mcpu</samp>. If neither are |
| specified, the assembler will default to <samp>-mcpu=all</samp>. |
| </p> |
| <p>The architecture option can be extended with the same instruction set |
| extension options as the <samp>-mcpu</samp> option. Unlike |
| <samp>-mcpu</samp>, extensions are not always enabled by default, |
| See <a href="AArch64-Extensions.html#AArch64-Extensions">AArch64 Extensions</a>. |
| </p> |
| </dd> |
| </dl> |
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