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115 lines
4.9 KiB
HTML
115 lines
4.9 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1992-2019 Free Software Foundation, Inc.
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Contributed by Cygnus Support. Written by Julia Menapace, Jim Kingdon,
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and David MacKenzie.
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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 1.3 or
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any later version published by the Free Software Foundation; with no
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Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
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Texts. A copy of the license is included in the section entitled "GNU
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Free Documentation License". -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Stab Section Transformations (STABS)</title>
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<meta name="description" content="Stab Section Transformations (STABS)">
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<meta name="keywords" content="Stab Section Transformations (STABS)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Symbol-Types-Index.html#Symbol-Types-Index" rel="index" title="Symbol Types Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Transformations-On-Symbol-Tables.html#Transformations-On-Symbol-Tables" rel="up" title="Transformations On Symbol Tables">
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<link href="Cplusplus.html#Cplusplus" rel="next" title="Cplusplus">
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<link href="Transformations-On-Global-Variables.html#Transformations-On-Global-Variables" rel="prev" title="Transformations On Global Variables">
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<style type="text/css">
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<!--
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a.summary-letter {text-decoration: none}
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blockquote.indentedblock {margin-right: 0em}
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blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
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blockquote.smallquotation {font-size: smaller}
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div.display {margin-left: 3.2em}
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div.example {margin-left: 3.2em}
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div.lisp {margin-left: 3.2em}
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div.smalldisplay {margin-left: 3.2em}
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div.smallexample {margin-left: 3.2em}
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div.smalllisp {margin-left: 3.2em}
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kbd {font-style: oblique}
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pre.display {font-family: inherit}
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pre.format {font-family: inherit}
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pre.menu-comment {font-family: serif}
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pre.menu-preformatted {font-family: serif}
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pre.smalldisplay {font-family: inherit; font-size: smaller}
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pre.smallexample {font-size: smaller}
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pre.smallformat {font-family: inherit; font-size: smaller}
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pre.smalllisp {font-size: smaller}
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span.nolinebreak {white-space: nowrap}
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span.roman {font-family: initial; font-weight: normal}
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span.sansserif {font-family: sans-serif; font-weight: normal}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Stab-Section-Transformations"></a>
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<div class="header">
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<p>
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Previous: <a href="Transformations-On-Global-Variables.html#Transformations-On-Global-Variables" accesskey="p" rel="prev">Transformations On Global 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>
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</div>
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<hr>
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<a name="Transformations-of-Stabs-in-separate-sections"></a>
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<h4 class="subsection">7.2.3 Transformations of Stabs in separate sections</h4>
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<p>For object file formats using stabs in separate sections (see <a href="Stab-Sections.html#Stab-Sections">Stab Sections</a>), use <code>objdump --stabs</code> instead of <code>nm</code> to show the
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stabs in an object or executable file. <code>objdump</code> is a GNU utility;
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Sun does not provide any equivalent.
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</p>
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<p>The following example is for a stab whose value is an address is
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relative to the compilation unit (see <a href="ELF-Linker-Relocation.html#ELF-Linker-Relocation">ELF Linker Relocation</a>). For
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example, if the source line
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</p>
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<div class="example">
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<pre class="example">static int ld = 5;
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</pre></div>
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<p>appears within a function, then the assembly language output from the
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compiler contains:
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</p>
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<div class="example">
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<pre class="example">.Ddata.data:
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…
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.stabs "ld:V(0,3)",0x26,0,4,.L18-Ddata.data # <span class="roman">0x26 is N_STSYM</span>
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…
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.L18:
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.align 4
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.word 0x5
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</pre></div>
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<p>Because the value is formed by subtracting one symbol from another, the
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value is absolute, not relocatable, and so the object file contains
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</p>
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<div class="example">
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<pre class="example">Symnum n_type n_othr n_desc n_value n_strx String
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31 STSYM 0 4 00000004 680 ld:V(0,3)
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</pre></div>
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<p>without any relocations, and the executable file also contains
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</p>
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<div class="example">
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<pre class="example">Symnum n_type n_othr n_desc n_value n_strx String
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31 STSYM 0 4 00000004 680 ld:V(0,3)
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</pre></div>
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</body>
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</html>
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