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.
150 lines
6.0 KiB
HTML
150 lines
6.0 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
|
<html>
|
|
<!-- This file documents the GNU Assembler "as".
|
|
|
|
Copyright (C) 1991-2019 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 1.3
|
|
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".
|
|
-->
|
|
<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
|
|
<head>
|
|
<title>Stab (Using as)</title>
|
|
|
|
<meta name="description" content="Stab (Using as)">
|
|
<meta name="keywords" content="Stab (Using as)">
|
|
<meta name="resource-type" content="document">
|
|
<meta name="distribution" content="global">
|
|
<meta name="Generator" content="makeinfo">
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
|
<link href="index.html#Top" rel="start" title="Top">
|
|
<link href="AS-Index.html#AS-Index" rel="index" title="AS Index">
|
|
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
|
<link href="Pseudo-Ops.html#Pseudo-Ops" rel="up" title="Pseudo Ops">
|
|
<link href="String.html#String" rel="next" title="String">
|
|
<link href="Space.html#Space" rel="prev" title="Space">
|
|
<style type="text/css">
|
|
<!--
|
|
a.summary-letter {text-decoration: none}
|
|
blockquote.indentedblock {margin-right: 0em}
|
|
blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
|
|
blockquote.smallquotation {font-size: smaller}
|
|
div.display {margin-left: 3.2em}
|
|
div.example {margin-left: 3.2em}
|
|
div.lisp {margin-left: 3.2em}
|
|
div.smalldisplay {margin-left: 3.2em}
|
|
div.smallexample {margin-left: 3.2em}
|
|
div.smalllisp {margin-left: 3.2em}
|
|
kbd {font-style: oblique}
|
|
pre.display {font-family: inherit}
|
|
pre.format {font-family: inherit}
|
|
pre.menu-comment {font-family: serif}
|
|
pre.menu-preformatted {font-family: serif}
|
|
pre.smalldisplay {font-family: inherit; font-size: smaller}
|
|
pre.smallexample {font-size: smaller}
|
|
pre.smallformat {font-family: inherit; font-size: smaller}
|
|
pre.smalllisp {font-size: smaller}
|
|
span.nolinebreak {white-space: nowrap}
|
|
span.roman {font-family: initial; font-weight: normal}
|
|
span.sansserif {font-family: sans-serif; font-weight: normal}
|
|
ul.no-bullet {list-style: none}
|
|
-->
|
|
</style>
|
|
|
|
|
|
</head>
|
|
|
|
<body lang="en">
|
|
<a name="Stab"></a>
|
|
<div class="header">
|
|
<p>
|
|
Next: <a href="String.html#String" accesskey="n" rel="next">String</a>, Previous: <a href="Space.html#Space" accesskey="p" rel="prev">Space</a>, Up: <a href="Pseudo-Ops.html#Pseudo-Ops" accesskey="u" rel="up">Pseudo Ops</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
|
|
</div>
|
|
<hr>
|
|
<a name="g_t_002estabd_002c-_002estabn_002c-_002estabs"></a>
|
|
<h3 class="section">7.90 <code>.stabd, .stabn, .stabs</code></h3>
|
|
|
|
<a name="index-symbolic-debuggers_002c-information-for"></a>
|
|
<a name="index-stabx-directives"></a>
|
|
<p>There are three directives that begin ‘<samp>.stab</samp>’.
|
|
All emit symbols (see <a href="Symbols.html#Symbols">Symbols</a>), for use by symbolic debuggers.
|
|
The symbols are not entered in the <code>as</code> hash table: they
|
|
cannot be referenced elsewhere in the source file.
|
|
Up to five fields are required:
|
|
</p>
|
|
<dl compact="compact">
|
|
<dt><var>string</var></dt>
|
|
<dd><p>This is the symbol’s name. It may contain any character except
|
|
‘<samp>\000</samp>’, so is more general than ordinary symbol names. Some
|
|
debuggers used to code arbitrarily complex structures into symbol names
|
|
using this field.
|
|
</p>
|
|
</dd>
|
|
<dt><var>type</var></dt>
|
|
<dd><p>An absolute expression. The symbol’s type is set to the low 8 bits of
|
|
this expression. Any bit pattern is permitted, but <code>ld</code>
|
|
and debuggers choke on silly bit patterns.
|
|
</p>
|
|
</dd>
|
|
<dt><var>other</var></dt>
|
|
<dd><p>An absolute expression. The symbol’s “other” attribute is set to the
|
|
low 8 bits of this expression.
|
|
</p>
|
|
</dd>
|
|
<dt><var>desc</var></dt>
|
|
<dd><p>An absolute expression. The symbol’s descriptor is set to the low 16
|
|
bits of this expression.
|
|
</p>
|
|
</dd>
|
|
<dt><var>value</var></dt>
|
|
<dd><p>An absolute expression which becomes the symbol’s value.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
<p>If a warning is detected while reading a <code>.stabd</code>, <code>.stabn</code>,
|
|
or <code>.stabs</code> statement, the symbol has probably already been created;
|
|
you get a half-formed symbol in your object file. This is
|
|
compatible with earlier assemblers!
|
|
</p>
|
|
<dl compact="compact">
|
|
<dd><a name="index-stabd-directive"></a>
|
|
</dd>
|
|
<dt><code>.stabd <var>type</var> , <var>other</var> , <var>desc</var></code></dt>
|
|
<dd>
|
|
<p>The “name” of the symbol generated is not even an empty string.
|
|
It is a null pointer, for compatibility. Older assemblers used a
|
|
null pointer so they didn’t waste space in object files with empty
|
|
strings.
|
|
</p>
|
|
<p>The symbol’s value is set to the location counter,
|
|
relocatably. When your program is linked, the value of this symbol
|
|
is the address of the location counter when the <code>.stabd</code> was
|
|
assembled.
|
|
</p>
|
|
<a name="index-stabn-directive"></a>
|
|
</dd>
|
|
<dt><code>.stabn <var>type</var> , <var>other</var> , <var>desc</var> , <var>value</var></code></dt>
|
|
<dd><p>The name of the symbol is set to the empty string <code>""</code>.
|
|
</p>
|
|
<a name="index-stabs-directive"></a>
|
|
</dd>
|
|
<dt><code>.stabs <var>string</var> , <var>type</var> , <var>other</var> , <var>desc</var> , <var>value</var></code></dt>
|
|
<dd><p>All five fields are specified.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
<hr>
|
|
<div class="header">
|
|
<p>
|
|
Next: <a href="String.html#String" accesskey="n" rel="next">String</a>, Previous: <a href="Space.html#Space" accesskey="p" rel="prev">Space</a>, Up: <a href="Pseudo-Ops.html#Pseudo-Ops" accesskey="u" rel="up">Pseudo Ops</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
|
|
</div>
|
|
|
|
|
|
|
|
</body>
|
|
</html>
|