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| Next: <a href="s390-Characters.html#s390-Characters" accesskey="n" rel="next">s390 Characters</a>, Up: <a href="S_002f390_002dDependent.html#S_002f390_002dDependent" accesskey="u" rel="up">S/390-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-19"></a> |
| <h4 class="subsection">9.37.1 Options</h4> |
| <a name="index-options-for-s390"></a> |
| <a name="index-s390-options"></a> |
| |
| <p>The following table lists all available s390 specific options: |
| </p> |
| <dl compact="compact"> |
| <dd><a name="index-_002dm31-option_002c-s390"></a> |
| <a name="index-_002dm64-option_002c-s390"></a> |
| </dd> |
| <dt><code>-m31 | -m64</code></dt> |
| <dd><p>Select 31- or 64-bit ABI implying a word size of 32- or 64-bit. |
| </p> |
| <p>These options are only available with the ELF object file format, and |
| require that the necessary BFD support has been included (on a 31-bit |
| platform you must add –enable-64-bit-bfd on the call to the configure |
| script to enable 64-bit usage and use s390x as target platform). |
| </p> |
| <a name="index-_002dmesa-option_002c-s390"></a> |
| <a name="index-_002dmzarch-option_002c-s390"></a> |
| </dd> |
| <dt><code>-mesa | -mzarch</code></dt> |
| <dd><p>Select the architecture mode, either the Enterprise System Architecture |
| (esa) mode or the z/Architecture mode (zarch). |
| </p> |
| <p>The 64-bit instructions are only available with the z/Architecture mode. |
| The combination of ‘<samp>-m64</samp>’ and ‘<samp>-mesa</samp>’ results in a warning |
| message. |
| </p> |
| <a name="index-_002dmarch_003d-option_002c-s390"></a> |
| </dd> |
| <dt><code>-march=<var>CPU</var></code></dt> |
| <dd><p>This option specifies the target processor. The following processor names |
| are recognized: |
| <code>g5</code>, |
| <code>g6</code>, |
| <code>z900</code>, |
| <code>z990</code>, |
| <code>z9-109</code>, |
| <code>z9-ec</code>, |
| <code>z10</code> and |
| <code>z196</code>. |
| Assembling an instruction that is not supported on the target processor |
| results in an error message. Do not specify <code>g5</code> or <code>g6</code> |
| with ‘<samp>-mzarch</samp>’. |
| </p> |
| <a name="index-_002dmregnames-option_002c-s390"></a> |
| </dd> |
| <dt><code>-mregnames</code></dt> |
| <dd><p>Allow symbolic names for registers. |
| </p> |
| <a name="index-_002dmno_002dregnames-option_002c-s390"></a> |
| </dd> |
| <dt><code>-mno-regnames</code></dt> |
| <dd><p>Do not allow symbolic names for registers. |
| </p> |
| <a name="index-_002dmwarn_002dareg_002dzero-option_002c-s390"></a> |
| </dd> |
| <dt><code>-mwarn-areg-zero</code></dt> |
| <dd><p>Warn whenever the operand for a base or index register has been specified |
| but evaluates to zero. This can indicate the misuse of general purpose |
| register 0 as an address register. |
| </p> |
| </dd> |
| </dl> |
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