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| author | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
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| committer | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
| commit | abdaadbcae30fe0c9a66c7516798279fdfd97750 (patch) | |
| tree | 00a54a6e25601e43876d03c1a4a12a749d4a914c /share/doc/stabs/Transformations-On-Global-Variables.html | |
https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads
Change-Id: I7303388733328cd98ab9aa3c30236db67f2e9e9c
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diff --git a/share/doc/stabs/Transformations-On-Global-Variables.html b/share/doc/stabs/Transformations-On-Global-Variables.html new file mode 100644 index 0000000..5856763 --- /dev/null +++ b/share/doc/stabs/Transformations-On-Global-Variables.html @@ -0,0 +1,111 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- Copyright (C) 1992-2023 Free Software Foundation, Inc. +Contributed by Cygnus Support. Written by Julia Menapace, Jim Kingdon, +and David MacKenzie. + +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 5.1, http://www.gnu.org/software/texinfo/ --> +<head> +<title>STABS: Transformations On Global Variables</title> + +<meta name="description" content="STABS: Transformations On Global Variables"> +<meta name="keywords" content="STABS: Transformations On Global Variables"> +<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="Symbol-Types-Index.html#Symbol-Types-Index" rel="index" title="Symbol Types Index"> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> +<link href="Transformations-On-Symbol-Tables.html#Transformations-On-Symbol-Tables" rel="up" title="Transformations On Symbol Tables"> +<link href="Stab-Section-Transformations.html#Stab-Section-Transformations" rel="next" title="Stab Section Transformations"> +<link href="Transformations-On-Static-Variables.html#Transformations-On-Static-Variables" rel="previous" title="Transformations On Static Variables"> +<style type="text/css"> +<!-- +a.summary-letter {text-decoration: none} +blockquote.smallquotation {font-size: smaller} +div.display {margin-left: 3.2em} +div.example {margin-left: 3.2em} +div.indentedblock {margin-left: 3.2em} +div.lisp {margin-left: 3.2em} +div.smalldisplay {margin-left: 3.2em} +div.smallexample {margin-left: 3.2em} +div.smallindentedblock {margin-left: 3.2em; font-size: smaller} +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.nocodebreak {white-space:nowrap} +span.nolinebreak {white-space:nowrap} +span.roman {font-family:serif; font-weight:normal} +span.sansserif {font-family:sans-serif; font-weight:normal} +ul.no-bullet {list-style: none} +--> +</style> + + +</head> + +<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> +<a name="Transformations-On-Global-Variables"></a> +<div class="header"> +<p> +Next: <a href="Stab-Section-Transformations.html#Stab-Section-Transformations" accesskey="n" rel="next">Stab Section Transformations</a>, Previous: <a href="Transformations-On-Static-Variables.html#Transformations-On-Static-Variables" accesskey="p" rel="previous">Transformations On Static Variables</a>, Up: <a href="Transformations-On-Symbol-Tables.html#Transformations-On-Symbol-Tables" accesskey="u" rel="up">Transformations On Symbol Tables</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Symbol-Types-Index.html#Symbol-Types-Index" title="Index" rel="index">Index</a>]</p> +</div> +<hr> +<a name="Transformations-on-Global-Variables"></a> +<h4 class="subsection">7.2.2 Transformations on Global Variables</h4> + +<p>Stabs for global variables do not contain location information. In +this case, the debugger finds location information in the assembler or +linker symbol table entry describing the variable. The source line: +</p> +<div class="example"> +<pre class="example">char g_foo = 'c'; +</pre></div> + +<p>generates the stab: +</p> +<div class="example"> +<pre class="example">.stabs "g_foo:G2",32,0,0,0 +</pre></div> + +<p>The variable is represented by two symbol table entries in the object +file (see below). The first one originated as a stab. The second one +is an external symbol. The upper case ‘<samp>D</samp>’ signifies that the +<code>n_type</code> field of the symbol table contains 7, <code>N_DATA</code> with +local linkage. The stab’s value is zero since the value is not used for +<code>N_GSYM</code> stabs. The value of the linker symbol is the relocatable +address corresponding to the variable. +</p> +<div class="example"> +<pre class="example">00000000 - 00 0000 GSYM g_foo:G2 +00000080 D _g_foo +</pre></div> + +<p>These entries as transformed by the linker. The linker symbol table +entry now holds an absolute address: +</p> +<div class="example"> +<pre class="example">00000000 - 00 0000 GSYM g_foo:G2 +… +0000e008 D _g_foo +</pre></div> + + + + +</body> +</html> |