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103 lines
4.5 KiB
HTML
103 lines
4.5 KiB
HTML
<!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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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>Symbol Table Format (STABS)</title>
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<meta name="description" content="Symbol Table Format (STABS)">
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<meta name="keywords" content="Symbol Table Format (STABS)">
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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="Symbol-Tables.html#Symbol-Tables" rel="up" title="Symbol Tables">
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<link href="Transformations-On-Symbol-Tables.html#Transformations-On-Symbol-Tables" rel="next" title="Transformations On Symbol Tables">
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<link href="Symbol-Tables.html#Symbol-Tables" rel="prev" title="Symbol Tables">
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<body lang="en">
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<a name="Symbol-Table-Format"></a>
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<div class="header">
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<p>
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Next: <a href="Transformations-On-Symbol-Tables.html#Transformations-On-Symbol-Tables" accesskey="n" rel="next">Transformations On Symbol Tables</a>, Up: <a href="Symbol-Tables.html#Symbol-Tables" accesskey="u" rel="up">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="Symbol-Table-Format-1"></a>
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<h3 class="section">7.1 Symbol Table Format</h3>
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<p>Each time the assembler encounters a stab directive, it puts
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each field of the stab into a corresponding field in a symbol table
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entry of its output file. If the stab contains a string field, the
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symbol table entry for that stab points to a string table entry
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containing the string data from the stab. Assembler labels become
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relocatable addresses. Symbol table entries in a.out have the format:
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</p>
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<div class="example">
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<pre class="example">struct internal_nlist {
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unsigned long n_strx; /* index into string table of name */
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unsigned char n_type; /* type of symbol */
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unsigned char n_other; /* misc info (usually empty) */
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unsigned short n_desc; /* description field */
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bfd_vma n_value; /* value of symbol */
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};
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</pre></div>
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<p>If the stab has a string, the <code>n_strx</code> field holds the offset in
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bytes of the string within the string table. The string is terminated
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by a NUL character. If the stab lacks a string (for example, it was
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produced by a <code>.stabn</code> or <code>.stabd</code> directive), the
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<code>n_strx</code> field is zero.
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</p>
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<p>Symbol table entries with <code>n_type</code> field values greater than 0x1f
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originated as stabs generated by the compiler (with one random
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exception). The other entries were placed in the symbol table of the
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executable by the assembler or the linker.
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</p>
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</body>
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</html>
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