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96 lines
4.4 KiB
HTML
96 lines
4.4 KiB
HTML
4 years ago
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<title>s390 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="S_002f390_002dDependent.html#S_002f390_002dDependent" title="S/390-Dependent">
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<link rel="next" href="s390-Characters.html#s390-Characters" title="s390 Characters">
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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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</head>
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<body>
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<div class="node">
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<a name="s390-Options"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="s390-Characters.html#s390-Characters">s390 Characters</a>,
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Up: <a rel="up" accesskey="u" href="S_002f390_002dDependent.html#S_002f390_002dDependent">S/390-Dependent</a>
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<hr>
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</div>
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<h4 class="subsection">9.38.1 Options</h4>
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<p><a name="index-options-for-s390-1874"></a><a name="index-s390-options-1875"></a>
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The following table lists all available s390 specific options:
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<a name="index-g_t_0040samp_007b_002dm31_007d-option_002c-s390-1876"></a>
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<a name="index-g_t_0040samp_007b_002dm64_007d-option_002c-s390-1877"></a>
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<dl><dt><code>-m31 | -m64</code><dd>Select 31- or 64-bit ABI implying a word size of 32- or 64-bit.
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<p>These options are only available with the ELF object file format, and
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require that the necessary BFD support has been included (on a 31-bit
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platform you must add –enable-64-bit-bfd on the call to the configure
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script to enable 64-bit usage and use s390x as target platform).
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<p><a name="index-g_t_0040samp_007b_002dmesa_007d-option_002c-s390-1878"></a><a name="index-g_t_0040samp_007b_002dmzarch_007d-option_002c-s390-1879"></a><br><dt><code>-mesa | -mzarch</code><dd>Select the architecture mode, either the Enterprise System Architecture
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(esa) mode or the z/Architecture mode (zarch).
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<p>The 64-bit instructions are only available with the z/Architecture mode.
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The combination of ‘<samp><span class="samp">-m64</span></samp>’ and ‘<samp><span class="samp">-mesa</span></samp>’ results in a warning
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message.
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<p><a name="index-g_t_0040samp_007b_002dmarch_003d_007d-option_002c-s390-1880"></a><br><dt><code>-march=</code><var>CPU</var><dd>This option specifies the target processor. The following processor names
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are recognized:
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<code>g5</code>,
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<code>g6</code>,
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<code>z900</code>,
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<code>z990</code>,
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<code>z9-109</code>,
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<code>z9-ec</code>,
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<code>z10</code>,
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<code>z196</code>,
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<code>zEC12</code>, and
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<code>z13</code>.
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Assembling an instruction that is not supported on the target processor
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results in an error message. Do not specify <code>g5</code> or <code>g6</code>
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with ‘<samp><span class="samp">-mzarch</span></samp>’.
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<p><a name="index-g_t_0040samp_007b_002dmregnames_007d-option_002c-s390-1881"></a><br><dt><code>-mregnames</code><dd>Allow symbolic names for registers.
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<p><a name="index-g_t_0040samp_007b_002dmno_002dregnames_007d-option_002c-s390-1882"></a><br><dt><code>-mno-regnames</code><dd>Do not allow symbolic names for registers.
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<p><a name="index-g_t_0040samp_007b_002dmwarn_002dareg_002dzero_007d-option_002c-s390-1883"></a><br><dt><code>-mwarn-areg-zero</code><dd>Warn whenever the operand for a base or index register has been specified
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but evaluates to zero. This can indicate the misuse of general purpose
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register 0 as an address register.
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</dl>
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</body></html>
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