75 lines
3.5 KiB
HTML
75 lines
3.5 KiB
HTML
<html lang="en">
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<head>
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<title>GNU Assembler - Using as</title>
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<link rel="up" href="Overview.html#Overview" title="Overview">
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<link rel="prev" href="Manual.html#Manual" title="Manual">
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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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</head>
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<body>
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<div class="node">
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<p>
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<a name="GNU-Assembler"></a>Next: <a rel="next" accesskey="n" href="Object-Formats.html#Object-Formats">Object Formats</a>,
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Previous: <a rel="previous" accesskey="p" href="Manual.html#Manual">Manual</a>,
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Up: <a rel="up" accesskey="u" href="Overview.html#Overview">Overview</a>
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<hr><br>
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</div>
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<h3 class="section">1.2 The GNU Assembler</h3>
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<!-- man begin DESCRIPTION -->
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<p><span class="sc">gnu</span> <span class="command">as</span> is really a family of assemblers.
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If you use (or have used) the <span class="sc">gnu</span> assembler on one architecture, you
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should find a fairly similar environment when you use it on another
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architecture. Each version has much in common with the others,
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including object file formats, most assembler directives (often called
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<dfn>pseudo-ops</dfn>) and assembler syntax.
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<p><a name="index-purpose-of-_0040sc_007bgnu_007d-assembler-23"></a><span class="command">as</span> is primarily intended to assemble the output of the
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<span class="sc">gnu</span> C compiler <code>gcc</code> for use by the linker
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<code>ld</code>. Nevertheless, we've tried to make <span class="command">as</span>
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assemble correctly everything that other assemblers for the same
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machine would assemble.
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Any exceptions are documented explicitly (see <a href="Machine-Dependencies.html#Machine-Dependencies">Machine Dependencies</a>).
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<!-- This remark should appear in generic version of manual; assumption -->
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<!-- here is that generic version sets M680x0. -->
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This doesn't mean <span class="command">as</span> always uses the same syntax as another
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assembler for the same architecture; for example, we know of several
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incompatible versions of 680x0 assembly language syntax.
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<!-- man end -->
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<p>Unlike older assemblers, <span class="command">as</span> is designed to assemble a source
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program in one pass of the source file. This has a subtle impact on the
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<kbd>.org</kbd> directive (see <a href="Org.html#Org"><code>.org</code></a>).
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</body></html>
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