You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
76 lines
3.5 KiB
HTML
76 lines
3.5 KiB
HTML
<html lang="en">
|
|
<head>
|
|
<title>GNU Assembler - Using as</title>
|
|
<meta http-equiv="Content-Type" content="text/html">
|
|
<meta name="description" content="Using as">
|
|
<meta name="generator" content="makeinfo 4.7">
|
|
<link title="Top" rel="start" href="index.html#Top">
|
|
<link rel="up" href="Overview.html#Overview" title="Overview">
|
|
<link rel="prev" href="Manual.html#Manual" title="Manual">
|
|
<link rel="next" href="Object-Formats.html#Object-Formats" title="Object Formats">
|
|
<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
|
|
<!--
|
|
This file documents the GNU Assembler "as".
|
|
|
|
Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002,
|
|
2006, 2007 Free Software Foundation, Inc.
|
|
|
|
Permission is granted to copy, distribute and/or modify this document
|
|
under the terms of the GNU Free Documentation License, Version 1.1
|
|
or any later version published by the Free Software Foundation;
|
|
with no Invariant Sections, with no Front-Cover Texts, and with no
|
|
Back-Cover Texts. A copy of the license is included in the
|
|
section entitled ``GNU Free Documentation License''.
|
|
|
|
man end-->
|
|
<meta http-equiv="Content-Style-Type" content="text/css">
|
|
<style type="text/css"><!--
|
|
pre.display { font-family:inherit }
|
|
pre.format { font-family:inherit }
|
|
pre.smalldisplay { font-family:inherit; font-size:smaller }
|
|
pre.smallformat { font-family:inherit; font-size:smaller }
|
|
pre.smallexample { font-size:smaller }
|
|
pre.smalllisp { font-size:smaller }
|
|
span.sc { font-variant:small-caps }
|
|
span.roman { font-family: serif; font-weight: normal; }
|
|
--></style>
|
|
</head>
|
|
<body>
|
|
<div class="node">
|
|
<p>
|
|
<a name="GNU-Assembler"></a>Next: <a rel="next" accesskey="n" href="Object-Formats.html#Object-Formats">Object Formats</a>,
|
|
Previous: <a rel="previous" accesskey="p" href="Manual.html#Manual">Manual</a>,
|
|
Up: <a rel="up" accesskey="u" href="Overview.html#Overview">Overview</a>
|
|
<hr><br>
|
|
</div>
|
|
|
|
<h3 class="section">1.2 The GNU Assembler</h3>
|
|
|
|
<!-- man begin DESCRIPTION -->
|
|
<p><span class="sc">gnu</span> <span class="command">as</span> is really a family of assemblers.
|
|
If you use (or have used) the <span class="sc">gnu</span> assembler on one architecture, you
|
|
should find a fairly similar environment when you use it on another
|
|
architecture. Each version has much in common with the others,
|
|
including object file formats, most assembler directives (often called
|
|
<dfn>pseudo-ops</dfn>) and assembler syntax.
|
|
|
|
<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
|
|
<span class="sc">gnu</span> C compiler <code>gcc</code> for use by the linker
|
|
<code>ld</code>. Nevertheless, we've tried to make <span class="command">as</span>
|
|
assemble correctly everything that other assemblers for the same
|
|
machine would assemble.
|
|
Any exceptions are documented explicitly (see <a href="Machine-Dependencies.html#Machine-Dependencies">Machine Dependencies</a>).
|
|
<!-- This remark should appear in generic version of manual; assumption -->
|
|
<!-- here is that generic version sets M680x0. -->
|
|
This doesn't mean <span class="command">as</span> always uses the same syntax as another
|
|
assembler for the same architecture; for example, we know of several
|
|
incompatible versions of 680x0 assembly language syntax.
|
|
|
|
<!-- man end -->
|
|
<p>Unlike older assemblers, <span class="command">as</span> is designed to assemble a source
|
|
program in one pass of the source file. This has a subtle impact on the
|
|
<kbd>.org</kbd> directive (see <a href="Org.html#Org"><code>.org</code></a>).
|
|
|
|
</body></html>
|
|
|