70 lines
3 KiB
HTML
70 lines
3 KiB
HTML
<html lang="en">
|
|
<head>
|
|
<title>ARM Mapping Symbols - 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="ARM_002dDependent.html#ARM_002dDependent" title="ARM-Dependent">
|
|
<link rel="prev" href="ARM-Opcodes.html#ARM-Opcodes" title="ARM Opcodes">
|
|
<link rel="next" href="ARM-Unwinding-Tutorial.html#ARM-Unwinding-Tutorial" title="ARM Unwinding Tutorial">
|
|
<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="ARM-Mapping-Symbols"></a>Next: <a rel="next" accesskey="n" href="ARM-Unwinding-Tutorial.html#ARM-Unwinding-Tutorial">ARM Unwinding Tutorial</a>,
|
|
Previous: <a rel="previous" accesskey="p" href="ARM-Opcodes.html#ARM-Opcodes">ARM Opcodes</a>,
|
|
Up: <a rel="up" accesskey="u" href="ARM_002dDependent.html#ARM_002dDependent">ARM-Dependent</a>
|
|
<hr><br>
|
|
</div>
|
|
|
|
<h4 class="subsection">9.3.6 Mapping Symbols</h4>
|
|
|
|
<p>The ARM ELF specification requires that special symbols be inserted
|
|
into object files to mark certain features:
|
|
|
|
|
|
<a name="index-_0040code_007b_0024a_007d-637"></a>
|
|
<dl><dt><code>$a</code><dd>At the start of a region of code containing ARM instructions.
|
|
|
|
<p><a name="index-_0040code_007b_0024t_007d-638"></a><br><dt><code>$t</code><dd>At the start of a region of code containing THUMB instructions.
|
|
|
|
<p><a name="index-_0040code_007b_0024d_007d-639"></a><br><dt><code>$d</code><dd>At the start of a region of data.
|
|
|
|
</dl>
|
|
|
|
<p>The assembler will automatically insert these symbols for you - there
|
|
is no need to code them yourself. Support for tagging symbols ($b,
|
|
$f, $p and $m) which is also mentioned in the current ARM ELF
|
|
specification is not implemented. This is because they have been
|
|
dropped from the new EABI and so tools cannot rely upon their
|
|
presence.
|
|
|
|
</body></html>
|
|
|