80 lines
3.6 KiB
HTML
80 lines
3.6 KiB
HTML
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<html lang="en">
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<head>
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<title>Stab Section Transformations - STABS</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="STABS">
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<meta name="generator" content="makeinfo 4.13">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Transformations-On-Symbol-Tables.html#Transformations-On-Symbol-Tables" title="Transformations On Symbol Tables">
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<link rel="prev" href="Transformations-On-Global-Variables.html#Transformations-On-Global-Variables" title="Transformations On Global Variables">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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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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</head>
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<body>
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<div class="node">
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<a name="Stab-Section-Transformations"></a>
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<p>
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Previous: <a rel="previous" accesskey="p" href="Transformations-On-Global-Variables.html#Transformations-On-Global-Variables">Transformations On Global Variables</a>,
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Up: <a rel="up" accesskey="u" href="Transformations-On-Symbol-Tables.html#Transformations-On-Symbol-Tables">Transformations On Symbol Tables</a>
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<hr>
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</div>
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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>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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<pre class="example"> static int ld = 5;
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</pre>
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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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<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>
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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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<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>
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<p>without any relocations, and the executable file also contains
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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>
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</body></html>
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