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| <h4 class="subsection">9.35.5 Sparc Machine Directives</h4> |
| |
| <p><a name="index-SPARC-machine-directives-1653"></a><a name="index-machine-directives_002c-SPARC-1654"></a>The Sparc version of <code>as</code> supports the following additional |
| machine directives: |
| |
| |
| <a name="index-g_t_0040code_007balign_007d-directive_002c-SPARC-1655"></a> |
| <dl><dt><code>.align</code><dd>This must be followed by the desired alignment in bytes. |
| |
| <p><a name="index-g_t_0040code_007bcommon_007d-directive_002c-SPARC-1656"></a><br><dt><code>.common</code><dd>This must be followed by a symbol name, a positive number, and |
| <code>"bss"</code>. This behaves somewhat like <code>.comm</code>, but the |
| syntax is different. |
| |
| <p><a name="index-g_t_0040code_007bhalf_007d-directive_002c-SPARC-1657"></a><br><dt><code>.half</code><dd>This is functionally identical to <code>.short</code>. |
| |
| <p><a name="index-g_t_0040code_007bnword_007d-directive_002c-SPARC-1658"></a><br><dt><code>.nword</code><dd>On the Sparc, the <code>.nword</code> directive produces native word sized value, |
| ie. if assembling with -32 it is equivalent to <code>.word</code>, if assembling |
| with -64 it is equivalent to <code>.xword</code>. |
| |
| <p><a name="index-g_t_0040code_007bproc_007d-directive_002c-SPARC-1659"></a><br><dt><code>.proc</code><dd>This directive is ignored. Any text following it on the same |
| line is also ignored. |
| |
| <p><a name="index-g_t_0040code_007bregister_007d-directive_002c-SPARC-1660"></a><br><dt><code>.register</code><dd>This directive declares use of a global application or system register. |
| It must be followed by a register name %g2, %g3, %g6 or %g7, comma and |
| the symbol name for that register. If symbol name is <code>#scratch</code>, |
| it is a scratch register, if it is <code>#ignore</code>, it just suppresses any |
| errors about using undeclared global register, but does not emit any |
| information about it into the object file. This can be useful e.g. if you |
| save the register before use and restore it after. |
| |
| <p><a name="index-g_t_0040code_007breserve_007d-directive_002c-SPARC-1661"></a><br><dt><code>.reserve</code><dd>This must be followed by a symbol name, a positive number, and |
| <code>"bss"</code>. This behaves somewhat like <code>.lcomm</code>, but the |
| syntax is different. |
| |
| <p><a name="index-g_t_0040code_007bseg_007d-directive_002c-SPARC-1662"></a><br><dt><code>.seg</code><dd>This must be followed by <code>"text"</code>, <code>"data"</code>, or |
| <code>"data1"</code>. It behaves like <code>.text</code>, <code>.data</code>, or |
| <code>.data 1</code>. |
| |
| <p><a name="index-g_t_0040code_007bskip_007d-directive_002c-SPARC-1663"></a><br><dt><code>.skip</code><dd>This is functionally identical to the <code>.space</code> directive. |
| |
| <p><a name="index-g_t_0040code_007bword_007d-directive_002c-SPARC-1664"></a><br><dt><code>.word</code><dd>On the Sparc, the <code>.word</code> directive produces 32 bit values, |
| instead of the 16 bit values it produces on many other machines. |
| |
| <p><a name="index-g_t_0040code_007bxword_007d-directive_002c-SPARC-1665"></a><br><dt><code>.xword</code><dd>On the Sparc V9 processor, the <code>.xword</code> directive produces |
| 64 bit values. |
| </dl> |
| |
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