239 lines
13 KiB
HTML
239 lines
13 KiB
HTML
<html lang="en">
|
|
<head>
|
|
<title>gdbserver man - Debugging with GDB</title>
|
|
<meta http-equiv="Content-Type" content="text/html">
|
|
<meta name="description" content="Debugging with GDB">
|
|
<meta name="generator" content="makeinfo 4.13">
|
|
<link title="Top" rel="start" href="index.html#Top">
|
|
<link rel="up" href="Man-Pages.html#Man-Pages" title="Man Pages">
|
|
<link rel="prev" href="gdb-man.html#gdb-man" title="gdb man">
|
|
<link rel="next" href="gcore-man.html#gcore-man" title="gcore man">
|
|
<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
|
|
<!--
|
|
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.''
|
|
-->
|
|
<meta http-equiv="Content-Style-Type" content="text/css">
|
|
<style type="text/css"><!--
|
|
pre.display { font-family:inherit }
|
|
pre.format { font-family:inherit }
|
|
pre.smalldisplay { font-family:inherit; font-size:smaller }
|
|
pre.smallformat { font-family:inherit; font-size:smaller }
|
|
pre.smallexample { font-size:smaller }
|
|
pre.smalllisp { font-size:smaller }
|
|
span.sc { font-variant:small-caps }
|
|
span.roman { font-family:serif; font-weight:normal; }
|
|
span.sansserif { font-family:sans-serif; font-weight:normal; }
|
|
--></style>
|
|
</head>
|
|
<body>
|
|
<div class="node">
|
|
<a name="gdbserver-man"></a>
|
|
<p>
|
|
Next: <a rel="next" accesskey="n" href="gcore-man.html#gcore-man">gcore man</a>,
|
|
Previous: <a rel="previous" accesskey="p" href="gdb-man.html#gdb-man">gdb man</a>,
|
|
Up: <a rel="up" accesskey="u" href="Man-Pages.html#Man-Pages">Man Pages</a>
|
|
<hr>
|
|
</div>
|
|
|
|
<h3 class="heading">gdbserver man</h3>
|
|
|
|
<!-- man title gdbserver Remote Server for the GNU Debugger -->
|
|
<pre class="format"><!-- man begin SYNOPSIS gdbserver -->
|
|
gdbserver <var>comm</var> <var>prog</var> [<var>args</var><small class="dots">...</small>]
|
|
|
|
gdbserver –attach <var>comm</var> <var>pid</var>
|
|
|
|
gdbserver –multi <var>comm</var>
|
|
<!-- man end -->
|
|
</pre>
|
|
<!-- man begin DESCRIPTION gdbserver -->
|
|
<p><samp><span class="command">gdbserver</span></samp> is a program that allows you to run <span class="sc">gdb</span> on a different machine
|
|
than the one which is running the program being debugged.
|
|
|
|
<h4 class="subheading">Usage (server (target) side)</h4>
|
|
|
|
<p>First, you need to have a copy of the program you want to debug put onto
|
|
the target system. The program can be stripped to save space if needed, as
|
|
<samp><span class="command">gdbserver</span></samp> doesn't care about symbols. All symbol handling is taken care of by
|
|
the <span class="sc">gdb</span> running on the host system.
|
|
|
|
<p>To use the server, you log on to the target system, and run the <samp><span class="command">gdbserver</span></samp>
|
|
program. You must tell it (a) how to communicate with <span class="sc">gdb</span>, (b) the name of
|
|
your program, and (c) its arguments. The general syntax is:
|
|
|
|
<pre class="smallexample"> target> gdbserver <var>comm</var> <var>program</var> [<var>args</var> ...]
|
|
</pre>
|
|
<p>For example, using a serial port, you might say:
|
|
|
|
<pre class="smallexample"> target> gdbserver <samp><span class="file">/dev/com1</span></samp> emacs foo.txt
|
|
</pre>
|
|
<p>This tells <samp><span class="command">gdbserver</span></samp> to debug emacs with an argument of foo.txt, and
|
|
to communicate with <span class="sc">gdb</span> via <samp><span class="file">/dev/com1</span></samp>. <samp><span class="command">gdbserver</span></samp> now
|
|
waits patiently for the host <span class="sc">gdb</span> to communicate with it.
|
|
|
|
<p>To use a TCP connection, you could say:
|
|
|
|
<pre class="smallexample"> target> gdbserver host:2345 emacs foo.txt
|
|
</pre>
|
|
<p>This says pretty much the same thing as the last example, except that we are
|
|
going to communicate with the <code>host</code> <span class="sc">gdb</span> via TCP. The <code>host:2345</code> argument means
|
|
that we are expecting to see a TCP connection from <code>host</code> to local TCP port
|
|
2345. (Currently, the <code>host</code> part is ignored.) You can choose any number you
|
|
want for the port number as long as it does not conflict with any existing TCP
|
|
ports on the target system. This same port number must be used in the host
|
|
<span class="sc">gdb</span>s <code>target remote</code> command, which will be described shortly. Note that if
|
|
you chose a port number that conflicts with another service, <samp><span class="command">gdbserver</span></samp> will
|
|
print an error message and exit.
|
|
|
|
<p><samp><span class="command">gdbserver</span></samp> can also attach to running programs.
|
|
This is accomplished via the <samp><span class="option">--attach</span></samp> argument. The syntax is:
|
|
|
|
<pre class="smallexample"> target> gdbserver --attach <var>comm</var> <var>pid</var>
|
|
</pre>
|
|
<p><var>pid</var> is the process ID of a currently running process. It isn't
|
|
necessary to point <samp><span class="command">gdbserver</span></samp> at a binary for the running process.
|
|
|
|
<p>To start <code>gdbserver</code> without supplying an initial command to run
|
|
or process ID to attach, use the <samp><span class="option">--multi</span></samp> command line option.
|
|
In such case you should connect using <kbd>target extended-remote</kbd> to start
|
|
the program you want to debug.
|
|
|
|
<pre class="smallexample"> target> gdbserver --multi <var>comm</var>
|
|
</pre>
|
|
<h4 class="subheading">Usage (host side)</h4>
|
|
|
|
<p>You need an unstripped copy of the target program on your host system, since
|
|
<span class="sc">gdb</span> needs to examine its symbol tables and such. Start up <span class="sc">gdb</span> as you normally
|
|
would, with the target program as the first argument. (You may need to use the
|
|
<samp><span class="option">--baud</span></samp> option if the serial line is running at anything except 9600 baud.)
|
|
That is <code>gdb TARGET-PROG</code>, or <code>gdb --baud BAUD TARGET-PROG</code>. After that, the only
|
|
new command you need to know about is <code>target remote</code>
|
|
(or <code>target extended-remote</code>). Its argument is either
|
|
a device name (usually a serial device, like <samp><span class="file">/dev/ttyb</span></samp>), or a <code>HOST:PORT</code>
|
|
descriptor. For example:
|
|
|
|
<pre class="smallexample"> (gdb) target remote <samp><span class="file">/dev/ttyb</span></samp>
|
|
</pre>
|
|
<p class="noindent">communicates with the server via serial line <samp><span class="file">/dev/ttyb</span></samp>, and:
|
|
|
|
<pre class="smallexample"> (gdb) target remote the-target:2345
|
|
</pre>
|
|
<p class="noindent">communicates via a TCP connection to port 2345 on host `the-target', where
|
|
you previously started up <samp><span class="command">gdbserver</span></samp> with the same port number. Note that for
|
|
TCP connections, you must start up <samp><span class="command">gdbserver</span></samp> prior to using the `target remote'
|
|
command, otherwise you may get an error that looks something like
|
|
`Connection refused'.
|
|
|
|
<p><samp><span class="command">gdbserver</span></samp> can also debug multiple inferiors at once,
|
|
described in
|
|
<a href="Inferiors-and-Programs.html#Inferiors-and-Programs">Inferiors and Programs</a>.
|
|
In such case use the <code>extended-remote</code> <span class="sc">gdb</span> command variant:
|
|
|
|
<pre class="smallexample"> (gdb) target extended-remote the-target:2345
|
|
</pre>
|
|
<p>The <samp><span class="command">gdbserver</span></samp> option <samp><span class="option">--multi</span></samp> may or may not be used in such
|
|
case.
|
|
<!-- man end -->
|
|
|
|
<!-- man begin OPTIONS gdbserver -->
|
|
<p>There are three different modes for invoking <samp><span class="command">gdbserver</span></samp>:
|
|
|
|
<ul>
|
|
<li>Debug a specific program specified by its program name:
|
|
|
|
<pre class="smallexample"> gdbserver <var>comm</var> <var>prog</var> [<var>args</var>...]
|
|
</pre>
|
|
<p>The <var>comm</var> parameter specifies how should the server communicate
|
|
with <span class="sc">gdb</span>; it is either a device name (to use a serial line),
|
|
a TCP port number (<code>:1234</code>), or <code>-</code> or <code>stdio</code> to use
|
|
stdin/stdout of <code>gdbserver</code>. Specify the name of the program to
|
|
debug in <var>prog</var>. Any remaining arguments will be passed to the
|
|
program verbatim. When the program exits, <span class="sc">gdb</span> will close the
|
|
connection, and <code>gdbserver</code> will exit.
|
|
|
|
<li>Debug a specific program by specifying the process ID of a running
|
|
program:
|
|
|
|
<pre class="smallexample"> gdbserver --attach <var>comm</var> <var>pid</var>
|
|
</pre>
|
|
<p>The <var>comm</var> parameter is as described above. Supply the process ID
|
|
of a running program in <var>pid</var>; <span class="sc">gdb</span> will do everything
|
|
else. Like with the previous mode, when the process <var>pid</var> exits,
|
|
<span class="sc">gdb</span> will close the connection, and <code>gdbserver</code> will exit.
|
|
|
|
<li>Multi-process mode – debug more than one program/process:
|
|
|
|
<pre class="smallexample"> gdbserver --multi <var>comm</var>
|
|
</pre>
|
|
<p>In this mode, <span class="sc">gdb</span> can instruct <samp><span class="command">gdbserver</span></samp> which
|
|
command(s) to run. Unlike the other 2 modes, <span class="sc">gdb</span> will not
|
|
close the connection when a process being debugged exits, so you can
|
|
debug several processes in the same session.
|
|
</ul>
|
|
|
|
<p>In each of the modes you may specify these options:
|
|
|
|
<dl>
|
|
<dt><samp><span class="env">--help</span></samp><dd>List all options, with brief explanations.
|
|
|
|
<br><dt><samp><span class="env">--version</span></samp><dd>This option causes <samp><span class="command">gdbserver</span></samp> to print its version number and exit.
|
|
|
|
<br><dt><samp><span class="env">--attach</span></samp><dd><samp><span class="command">gdbserver</span></samp> will attach to a running program. The syntax is:
|
|
|
|
<pre class="smallexample"> target> gdbserver --attach <var>comm</var> <var>pid</var>
|
|
</pre>
|
|
<p><var>pid</var> is the process ID of a currently running process. It isn't
|
|
necessary to point <samp><span class="command">gdbserver</span></samp> at a binary for the running process.
|
|
|
|
<br><dt><samp><span class="env">--multi</span></samp><dd>To start <code>gdbserver</code> without supplying an initial command to run
|
|
or process ID to attach, use this command line option.
|
|
Then you can connect using <kbd>target extended-remote</kbd> and start
|
|
the program you want to debug. The syntax is:
|
|
|
|
<pre class="smallexample"> target> gdbserver --multi <var>comm</var>
|
|
</pre>
|
|
<br><dt><samp><span class="env">--debug</span></samp><dd>Instruct <code>gdbserver</code> to display extra status information about the debugging
|
|
process.
|
|
This option is intended for <code>gdbserver</code> development and for bug reports to
|
|
the developers.
|
|
|
|
<br><dt><samp><span class="env">--remote-debug</span></samp><dd>Instruct <code>gdbserver</code> to display remote protocol debug output.
|
|
This option is intended for <code>gdbserver</code> development and for bug reports to
|
|
the developers.
|
|
|
|
<br><dt><samp><span class="env">--debug-format=option1[,option2,...]</span></samp><dd>Instruct <code>gdbserver</code> to include extra information in each line
|
|
of debugging output.
|
|
See <a href="Other-Command_002dLine-Arguments-for-gdbserver.html#Other-Command_002dLine-Arguments-for-gdbserver">Other Command-Line Arguments for gdbserver</a>.
|
|
|
|
<br><dt><samp><span class="env">--wrapper</span></samp><dd>Specify a wrapper to launch programs
|
|
for debugging. The option should be followed by the name of the
|
|
wrapper, then any command-line arguments to pass to the wrapper, then
|
|
<kbd>--</kbd> indicating the end of the wrapper arguments.
|
|
|
|
<br><dt><samp><span class="env">--once</span></samp><dd>By default, <samp><span class="command">gdbserver</span></samp> keeps the listening TCP port open, so that
|
|
additional connections are possible. However, if you start <code>gdbserver</code>
|
|
with the <samp><span class="option">--once</span></samp> option, it will stop listening for any further
|
|
connection attempts after connecting to the first <span class="sc">gdb</span> session.
|
|
|
|
<!-- disable-packet is not documented for users. -->
|
|
<!-- disable-randomization and -no-disable-randomization are superseded by -->
|
|
<!-- QDisableRandomization. -->
|
|
</dl>
|
|
<!-- man end -->
|
|
|
|
<!-- man begin SEEALSO gdbserver -->
|
|
<!-- man end -->
|
|
</body></html>
|
|
|