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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 | 6ce4ebed87858ecdd79a1091367c6e961055daa9 (patch) | |
| tree | 1c2a6a60531acf791531bbd9c8ac14c23ef8a66c /share/doc/gdb/MiniDebugInfo.html | |
https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads
Change-Id: I7303388733328cd98ab9aa3c30236db67f2e9e9c
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diff --git a/share/doc/gdb/MiniDebugInfo.html b/share/doc/gdb/MiniDebugInfo.html new file mode 100644 index 0000000..4e8fb8d --- /dev/null +++ b/share/doc/gdb/MiniDebugInfo.html @@ -0,0 +1,136 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- Copyright (C) 1988-2023 Free Software Foundation, Inc. + +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 the +Invariant Sections being "Free Software" and "Free Software Needs +Free Documentation", with the Front-Cover Texts being "A GNU Manual," +and with the Back-Cover Texts as in (a) below. + +(a) The FSF's Back-Cover Text is: "You are free to copy and modify +this GNU Manual. Buying copies from GNU Press supports the FSF in +developing GNU and promoting software freedom." --> +<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ --> +<head> +<title>Debugging with GDB: MiniDebugInfo</title> + +<meta name="description" content="Debugging with GDB: MiniDebugInfo"> +<meta name="keywords" content="Debugging with GDB: MiniDebugInfo"> +<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="Concept-Index.html#Concept-Index" rel="index" title="Concept Index"> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> +<link href="GDB-Files.html#GDB-Files" rel="up" title="GDB Files"> +<link href="Index-Files.html#Index-Files" rel="next" title="Index Files"> +<link href="Separate-Debug-Files.html#Separate-Debug-Files" rel="previous" title="Separate Debug Files"> +<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="MiniDebugInfo"></a> +<div class="header"> +<p> +Next: <a href="Index-Files.html#Index-Files" accesskey="n" rel="next">Index Files</a>, Previous: <a href="Separate-Debug-Files.html#Separate-Debug-Files" accesskey="p" rel="previous">Separate Debug Files</a>, Up: <a href="GDB-Files.html#GDB-Files" accesskey="u" rel="up">GDB Files</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p> +</div> +<hr> +<a name="Debugging-information-in-a-special-section"></a> +<h3 class="section">18.4 Debugging information in a special section</h3> +<a name="index-separate-debug-sections"></a> +<a name="index-_002egnu_005fdebugdata-section"></a> + +<p>Some systems ship pre-built executables and libraries that have a +special ‘<samp>.gnu_debugdata</samp>’ section. This feature is called +<em>MiniDebugInfo</em>. This section holds an LZMA-compressed object and +is used to supply extra symbols for backtraces. +</p> +<p>The intent of this section is to provide extra minimal debugging +information for use in simple backtraces. It is not intended to be a +replacement for full separate debugging information (see <a href="Separate-Debug-Files.html#Separate-Debug-Files">Separate Debug Files</a>). The example below shows the intended use; however, +<small>GDB</small> does not currently put restrictions on what sort of +debugging information might be included in the section. +</p> +<p><small>GDB</small> has support for this extension. If the section exists, +then it is used provided that no other source of debugging information +can be found, and that <small>GDB</small> was configured with LZMA support. +</p> +<p>This section can be easily created using <code>objcopy</code> and other +standard utilities: +</p> +<div class="smallexample"> +<pre class="smallexample"># Extract the dynamic symbols from the main binary, there is no need +# to also have these in the normal symbol table. +nm -D <var>binary</var> --format=posix --defined-only \ + | awk '{ print $1 }' | sort > dynsyms + +# Extract all the text (i.e. function) symbols from the debuginfo. +# (Note that we actually also accept "D" symbols, for the benefit +# of platforms like PowerPC64 that use function descriptors.) +nm <var>binary</var> --format=posix --defined-only \ + | awk '{ if ($2 == "T" || $2 == "t" || $2 == "D") print $1 }' \ + | sort > funcsyms + +# Keep all the function symbols not already in the dynamic symbol +# table. +comm -13 dynsyms funcsyms > keep_symbols + +# Separate full debug info into debug binary. +objcopy --only-keep-debug <var>binary</var> debug + +# Copy the full debuginfo, keeping only a minimal set of symbols and +# removing some unnecessary sections. +objcopy -S --remove-section .gdb_index --remove-section .comment \ + --keep-symbols=keep_symbols debug mini_debuginfo + +# Drop the full debug info from the original binary. +strip --strip-all -R .comment <var>binary</var> + +# Inject the compressed data into the .gnu_debugdata section of the +# original binary. +xz mini_debuginfo +objcopy --add-section .gnu_debugdata=mini_debuginfo.xz <var>binary</var> +</pre></div> + +<hr> +<div class="header"> +<p> +Next: <a href="Index-Files.html#Index-Files" accesskey="n" rel="next">Index Files</a>, Previous: <a href="Separate-Debug-Files.html#Separate-Debug-Files" accesskey="p" rel="previous">Separate Debug Files</a>, Up: <a href="GDB-Files.html#GDB-Files" accesskey="u" rel="up">GDB Files</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p> +</div> + + + +</body> +</html> |