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| <h4 class="subsection">9.31.1 Options</h4> |
| |
| <p><a name="index-options-for-s390-1520"></a><a name="index-s390-options-1521"></a> |
| The following table lists all available s390 specific options: |
| |
| |
| <a name="index-g_t_0040samp_007b_002dm31_007d-option_002c-s390-1522"></a> |
| <a name="index-g_t_0040samp_007b_002dm64_007d-option_002c-s390-1523"></a> |
| <dl><dt><code>-m31 | -m64</code><dd>Select 31- or 64-bit ABI implying a word size of 32- or 64-bit. |
| |
| <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-g_t_0040samp_007b_002dmesa_007d-option_002c-s390-1524"></a><a name="index-g_t_0040samp_007b_002dmzarch_007d-option_002c-s390-1525"></a><br><dt><code>-mesa | -mzarch</code><dd>Select the architecture mode, either the Enterprise System Architecture |
| (esa) mode or the z/Architecture mode (zarch). |
| |
| <p>The 64-bit instructions are only available with the z/Architecture mode. |
| The combination of ‘<samp><span class="samp">-m64</span></samp>’ and ‘<samp><span class="samp">-mesa</span></samp>’ results in a warning |
| message. |
| |
| <p><a name="index-g_t_0040samp_007b_002dmarch_003d_007d-option_002c-s390-1526"></a><br><dt><code>-march=</code><var>CPU</var><dd>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> and |
| <code>z10</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><span class="samp">-mzarch</span></samp>’. |
| |
| <p><a name="index-g_t_0040samp_007b_002dmregnames_007d-option_002c-s390-1527"></a><br><dt><code>-mregnames</code><dd>Allow symbolic names for registers. |
| |
| <p><a name="index-g_t_0040samp_007b_002dmno_002dregnames_007d-option_002c-s390-1528"></a><br><dt><code>-mno-regnames</code><dd>Do not allow symbolic names for registers. |
| |
| <p><a name="index-g_t_0040samp_007b_002dmwarn_002dareg_002dzero_007d-option_002c-s390-1529"></a><br><dt><code>-mwarn-areg-zero</code><dd>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. |
| |
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