diff options
Diffstat (limited to 'share/doc/stabs/Transformations-On-Symbol-Tables.html')
| -rw-r--r-- | share/doc/stabs/Transformations-On-Symbol-Tables.html | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/share/doc/stabs/Transformations-On-Symbol-Tables.html b/share/doc/stabs/Transformations-On-Symbol-Tables.html new file mode 100644 index 0000000..202a64c --- /dev/null +++ b/share/doc/stabs/Transformations-On-Symbol-Tables.html @@ -0,0 +1,106 @@ +<!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 Symbol Tables</title> + +<meta name="description" content="STABS: Transformations On Symbol Tables"> +<meta name="keywords" content="STABS: Transformations On Symbol Tables"> +<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="Symbol-Tables.html#Symbol-Tables" rel="up" title="Symbol Tables"> +<link href="Transformations-On-Static-Variables.html#Transformations-On-Static-Variables" rel="next" title="Transformations On Static Variables"> +<link href="Symbol-Table-Format.html#Symbol-Table-Format" rel="previous" title="Symbol Table Format"> +<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-Symbol-Tables"></a> +<div class="header"> +<p> +Previous: <a href="Symbol-Table-Format.html#Symbol-Table-Format" accesskey="p" rel="previous">Symbol Table Format</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> +</div> +<hr> +<a name="Transformations-on-Symbol-Tables"></a> +<h3 class="section">7.2 Transformations on Symbol Tables</h3> + +<p>The linker concatenates object files and does fixups of externally +defined symbols. +</p> +<p>You can see the transformations made on stab data by the assembler and +linker by examining the symbol table after each pass of the build. To +do this, use ‘<samp>nm -ap</samp>’, which dumps the symbol table, including +debugging information, unsorted. For stab entries the columns are: +<var>value</var>, <var>other</var>, <var>desc</var>, <var>type</var>, <var>string</var>. For +assembler and linker symbols, the columns are: <var>value</var>, <var>type</var>, +<var>string</var>. +</p> +<p>The low 5 bits of the stab type tell the linker how to relocate the +value of the stab. Thus for stab types like <code>N_RSYM</code> and +<code>N_LSYM</code>, where the value is an offset or a register number, the +low 5 bits are <code>N_ABS</code>, which tells the linker not to relocate the +value. +</p> +<p>Where the value of a stab contains an assembly language label, +it is transformed by each build step. The assembler turns it into a +relocatable address and the linker turns it into an absolute address. +</p> +<table class="menu" border="0" cellspacing="0"> +<tr><td align="left" valign="top">• <a href="Transformations-On-Static-Variables.html#Transformations-On-Static-Variables" accesskey="1">Transformations On Static Variables</a>:</td><td> </td><td align="left" valign="top"> +</td></tr> +<tr><td align="left" valign="top">• <a href="Transformations-On-Global-Variables.html#Transformations-On-Global-Variables" accesskey="2">Transformations On Global Variables</a>:</td><td> </td><td align="left" valign="top"> +</td></tr> +<tr><td align="left" valign="top">• <a href="Stab-Section-Transformations.html#Stab-Section-Transformations" accesskey="3">Stab Section Transformations</a>:</td><td> </td><td align="left" valign="top">For some object file formats, + things are a bit different. +</td></tr> +</table> + + + + +</body> +</html> |