You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
180 lines
8.6 KiB
HTML
180 lines
8.6 KiB
HTML
4 years ago
|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||
|
|
<html>
|
||
|
|
<!-- Copyright (C) 1988-2019 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 6.4, http://www.gnu.org/software/texinfo/ -->
|
||
|
|
<head>
|
||
|
|
<title>dotdebug_gdb_scripts section (Debugging with GDB)</title>
|
||
|
|
|
||
|
|
<meta name="description" content="dotdebug_gdb_scripts section (Debugging with GDB)">
|
||
|
|
<meta name="keywords" content="dotdebug_gdb_scripts section (Debugging with GDB)">
|
||
|
|
<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="Auto_002dloading-extensions.html#Auto_002dloading-extensions" rel="up" title="Auto-loading extensions">
|
||
|
|
<link href="Which-flavor-to-choose_003f.html#Which-flavor-to-choose_003f" rel="next" title="Which flavor to choose?">
|
||
|
|
<link href="objfile_002dgdbdotext-file.html#objfile_002dgdbdotext-file" rel="prev" title="objfile-gdbdotext file">
|
||
|
|
<style type="text/css">
|
||
|
|
<!--
|
||
|
|
a.summary-letter {text-decoration: none}
|
||
|
|
blockquote.indentedblock {margin-right: 0em}
|
||
|
|
blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
|
||
|
|
blockquote.smallquotation {font-size: smaller}
|
||
|
|
div.display {margin-left: 3.2em}
|
||
|
|
div.example {margin-left: 3.2em}
|
||
|
|
div.lisp {margin-left: 3.2em}
|
||
|
|
div.smalldisplay {margin-left: 3.2em}
|
||
|
|
div.smallexample {margin-left: 3.2em}
|
||
|
|
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.nolinebreak {white-space: nowrap}
|
||
|
|
span.roman {font-family: initial; font-weight: normal}
|
||
|
|
span.sansserif {font-family: sans-serif; font-weight: normal}
|
||
|
|
ul.no-bullet {list-style: none}
|
||
|
|
-->
|
||
|
|
</style>
|
||
|
|
|
||
|
|
|
||
|
|
</head>
|
||
|
|
|
||
|
|
<body lang="en">
|
||
|
|
<a name="dotdebug_005fgdb_005fscripts-section"></a>
|
||
|
|
<div class="header">
|
||
|
|
<p>
|
||
|
|
Next: <a href="Which-flavor-to-choose_003f.html#Which-flavor-to-choose_003f" accesskey="n" rel="next">Which flavor to choose?</a>, Previous: <a href="objfile_002dgdbdotext-file.html#objfile_002dgdbdotext-file" accesskey="p" rel="prev">objfile-gdbdotext file</a>, Up: <a href="Auto_002dloading-extensions.html#Auto_002dloading-extensions" accesskey="u" rel="up">Auto-loading extensions</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="The-_002edebug_005fgdb_005fscripts-section"></a>
|
||
|
|
<h4 class="subsection">23.4.2 The <code>.debug_gdb_scripts</code> section</h4>
|
||
|
|
<a name="index-_002edebug_005fgdb_005fscripts-section"></a>
|
||
|
|
|
||
|
|
<p>For systems using file formats like ELF and COFF,
|
||
|
|
when <small>GDB</small> loads a new object file
|
||
|
|
it will look for a special section named <code>.debug_gdb_scripts</code>.
|
||
|
|
If this section exists, its contents is a list of null-terminated entries
|
||
|
|
specifying scripts to load. Each entry begins with a non-null prefix byte that
|
||
|
|
specifies the kind of entry, typically the extension language and whether the
|
||
|
|
script is in a file or inlined in <code>.debug_gdb_scripts</code>.
|
||
|
|
</p>
|
||
|
|
<p>The following entries are supported:
|
||
|
|
</p>
|
||
|
|
<dl compact="compact">
|
||
|
|
<dt><code>SECTION_SCRIPT_ID_PYTHON_FILE = 1</code></dt>
|
||
|
|
<dt><code>SECTION_SCRIPT_ID_SCHEME_FILE = 3</code></dt>
|
||
|
|
<dt><code>SECTION_SCRIPT_ID_PYTHON_TEXT = 4</code></dt>
|
||
|
|
<dt><code>SECTION_SCRIPT_ID_SCHEME_TEXT = 6</code></dt>
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<a name="Script-File-Entries"></a>
|
||
|
|
<h4 class="subsubsection">23.4.2.1 Script File Entries</h4>
|
||
|
|
|
||
|
|
<p>If the entry specifies a file, <small>GDB</small> will look for the file first
|
||
|
|
in the current directory and then along the source search path
|
||
|
|
(see <a href="Source-Path.html#Source-Path">Specifying Source Directories</a>),
|
||
|
|
except that <samp>$cdir</samp> is not searched, since the compilation
|
||
|
|
directory is not relevant to scripts.
|
||
|
|
</p>
|
||
|
|
<p>File entries can be placed in section <code>.debug_gdb_scripts</code> with,
|
||
|
|
for example, this GCC macro for Python scripts.
|
||
|
|
</p>
|
||
|
|
<div class="example">
|
||
|
|
<pre class="example">/* Note: The "MS" section flags are to remove duplicates. */
|
||
|
|
#define DEFINE_GDB_PY_SCRIPT(script_name) \
|
||
|
|
asm("\
|
||
|
|
.pushsection \".debug_gdb_scripts\", \"MS\",@progbits,1\n\
|
||
|
|
.byte 1 /* Python */\n\
|
||
|
|
.asciz \"" script_name "\"\n\
|
||
|
|
.popsection \n\
|
||
|
|
");
|
||
|
|
</pre></div>
|
||
|
|
|
||
|
|
<p>For Guile scripts, replace <code>.byte 1</code> with <code>.byte 3</code>.
|
||
|
|
Then one can reference the macro in a header or source file like this:
|
||
|
|
</p>
|
||
|
|
<div class="example">
|
||
|
|
<pre class="example">DEFINE_GDB_PY_SCRIPT ("my-app-scripts.py")
|
||
|
|
</pre></div>
|
||
|
|
|
||
|
|
<p>The script name may include directories if desired.
|
||
|
|
</p>
|
||
|
|
<p>Note that loading of this script file also requires accordingly configured
|
||
|
|
<code>auto-load safe-path</code> (see <a href="Auto_002dloading-safe-path.html#Auto_002dloading-safe-path">Auto-loading safe path</a>).
|
||
|
|
</p>
|
||
|
|
<p>If the macro invocation is put in a header, any application or library
|
||
|
|
using this header will get a reference to the specified script,
|
||
|
|
and with the use of <code>"MS"</code> attributes on the section, the linker
|
||
|
|
will remove duplicates.
|
||
|
|
</p>
|
||
|
|
<a name="Script-Text-Entries"></a>
|
||
|
|
<h4 class="subsubsection">23.4.2.2 Script Text Entries</h4>
|
||
|
|
|
||
|
|
<p>Script text entries allow to put the executable script in the entry
|
||
|
|
itself instead of loading it from a file.
|
||
|
|
The first line of the entry, everything after the prefix byte and up to
|
||
|
|
the first newline (<code>0xa</code>) character, is the script name, and must not
|
||
|
|
contain any kind of space character, e.g., spaces or tabs.
|
||
|
|
The rest of the entry, up to the trailing null byte, is the script to
|
||
|
|
execute in the specified language. The name needs to be unique among
|
||
|
|
all script names, as <small>GDB</small> executes each script only once based
|
||
|
|
on its name.
|
||
|
|
</p>
|
||
|
|
<p>Here is an example from file <samp>py-section-script.c</samp> in the <small>GDB</small>
|
||
|
|
testsuite.
|
||
|
|
</p>
|
||
|
|
<div class="example">
|
||
|
|
<pre class="example">#include "symcat.h"
|
||
|
|
#include "gdb/section-scripts.h"
|
||
|
|
asm(
|
||
|
|
".pushsection \".debug_gdb_scripts\", \"MS\",@progbits,1\n"
|
||
|
|
".byte " XSTRING (SECTION_SCRIPT_ID_PYTHON_TEXT) "\n"
|
||
|
|
".ascii \"gdb.inlined-script\\n\"\n"
|
||
|
|
".ascii \"class test_cmd (gdb.Command):\\n\"\n"
|
||
|
|
".ascii \" def __init__ (self):\\n\"\n"
|
||
|
|
".ascii \" super (test_cmd, self).__init__ ("
|
||
|
|
"\\\"test-cmd\\\", gdb.COMMAND_OBSCURE)\\n\"\n"
|
||
|
|
".ascii \" def invoke (self, arg, from_tty):\\n\"\n"
|
||
|
|
".ascii \" print (\\\"test-cmd output, arg = %s\\\" % arg)\\n\"\n"
|
||
|
|
".ascii \"test_cmd ()\\n\"\n"
|
||
|
|
".byte 0\n"
|
||
|
|
".popsection\n"
|
||
|
|
);
|
||
|
|
</pre></div>
|
||
|
|
|
||
|
|
<p>Loading of inlined scripts requires a properly configured
|
||
|
|
<code>auto-load safe-path</code> (see <a href="Auto_002dloading-safe-path.html#Auto_002dloading-safe-path">Auto-loading safe path</a>).
|
||
|
|
The path to specify in <code>auto-load safe-path</code> is the path of the file
|
||
|
|
containing the <code>.debug_gdb_scripts</code> section.
|
||
|
|
</p>
|
||
|
|
<hr>
|
||
|
|
<div class="header">
|
||
|
|
<p>
|
||
|
|
Next: <a href="Which-flavor-to-choose_003f.html#Which-flavor-to-choose_003f" accesskey="n" rel="next">Which flavor to choose?</a>, Previous: <a href="objfile_002dgdbdotext-file.html#objfile_002dgdbdotext-file" accesskey="p" rel="prev">objfile-gdbdotext file</a>, Up: <a href="Auto_002dloading-extensions.html#Auto_002dloading-extensions" accesskey="u" rel="up">Auto-loading extensions</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>
|