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98 lines
5.2 KiB
HTML
98 lines
5.2 KiB
HTML
15 years ago
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<title>Sparc-Directives - Using as</title>
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<meta name="description" content="Using as">
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<meta name="generator" content="makeinfo 4.7">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Sparc_002dDependent.html#Sparc_002dDependent" title="Sparc-Dependent">
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<link rel="prev" href="Sparc_002dFloat.html#Sparc_002dFloat" title="Sparc-Float">
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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, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002,
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2006, 2007 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 1.1
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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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man end-->
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--></style>
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</head>
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<body>
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<div class="node">
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<p>
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<a name="Sparc_002dDirectives"></a>Previous: <a rel="previous" accesskey="p" href="Sparc_002dFloat.html#Sparc_002dFloat">Sparc-Float</a>,
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Up: <a rel="up" accesskey="u" href="Sparc_002dDependent.html#Sparc_002dDependent">Sparc-Dependent</a>
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<hr><br>
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</div>
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<h4 class="subsection">9.30.5 Sparc Machine Directives</h4>
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<p><a name="index-SPARC-machine-directives-1524"></a><a name="index-machine-directives_002c-SPARC-1525"></a>The Sparc version of <code>as</code> supports the following additional
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machine directives:
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<a name="index-_0040code_007balign_007d-directive_002c-SPARC-1526"></a>
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<dl><dt><code>.align</code><dd>This must be followed by the desired alignment in bytes.
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<p><a name="index-_0040code_007bcommon_007d-directive_002c-SPARC-1527"></a><br><dt><code>.common</code><dd>This must be followed by a symbol name, a positive number, and
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<code>"bss"</code>. This behaves somewhat like <code>.comm</code>, but the
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syntax is different.
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<p><a name="index-_0040code_007bhalf_007d-directive_002c-SPARC-1528"></a><br><dt><code>.half</code><dd>This is functionally identical to <code>.short</code>.
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<p><a name="index-_0040code_007bnword_007d-directive_002c-SPARC-1529"></a><br><dt><code>.nword</code><dd>On the Sparc, the <code>.nword</code> directive produces native word sized value,
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ie. if assembling with -32 it is equivalent to <code>.word</code>, if assembling
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with -64 it is equivalent to <code>.xword</code>.
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<p><a name="index-_0040code_007bproc_007d-directive_002c-SPARC-1530"></a><br><dt><code>.proc</code><dd>This directive is ignored. Any text following it on the same
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line is also ignored.
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<p><a name="index-_0040code_007bregister_007d-directive_002c-SPARC-1531"></a><br><dt><code>.register</code><dd>This directive declares use of a global application or system register.
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It must be followed by a register name %g2, %g3, %g6 or %g7, comma and
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the symbol name for that register. If symbol name is <code>#scratch</code>,
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it is a scratch register, if it is <code>#ignore</code>, it just suppresses any
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errors about using undeclared global register, but does not emit any
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information about it into the object file. This can be useful e.g. if you
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save the register before use and restore it after.
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<p><a name="index-_0040code_007breserve_007d-directive_002c-SPARC-1532"></a><br><dt><code>.reserve</code><dd>This must be followed by a symbol name, a positive number, and
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<code>"bss"</code>. This behaves somewhat like <code>.lcomm</code>, but the
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syntax is different.
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<p><a name="index-_0040code_007bseg_007d-directive_002c-SPARC-1533"></a><br><dt><code>.seg</code><dd>This must be followed by <code>"text"</code>, <code>"data"</code>, or
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<code>"data1"</code>. It behaves like <code>.text</code>, <code>.data</code>, or
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<code>.data 1</code>.
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<p><a name="index-_0040code_007bskip_007d-directive_002c-SPARC-1534"></a><br><dt><code>.skip</code><dd>This is functionally identical to the <code>.space</code> directive.
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<p><a name="index-_0040code_007bword_007d-directive_002c-SPARC-1535"></a><br><dt><code>.word</code><dd>On the Sparc, the <code>.word</code> directive produces 32 bit values,
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instead of the 16 bit values it produces on many other machines.
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<p><a name="index-_0040code_007bxword_007d-directive_002c-SPARC-1536"></a><br><dt><code>.xword</code><dd>On the Sparc V9 processor, the <code>.xword</code> directive produces
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64 bit values.
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</dl>
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<!-- Copyright 2000, 2002, 2003 Free Software Foundation, Inc. -->
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<!-- This is part of the GAS manual. -->
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<!-- For copying conditions, see the file as.texinfo. -->
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<!-- TI TMS320C54X description by Timothy Wall, twall@cygnus.com -->
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</body></html>
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