gdbserver - Remote Server for the GNU Debugger
tty prog [args...]
gdbserver tty --attach PID
GDBSERVER is a program that allows you to run GDB on a different
machine than the one which is running the program being debugged.
Usage (server (target) side):
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 GDBserver doesn't care about symbols. All symbol handling
is taken care of by the GDB running on the host system.
To use the server, you log on to the target system, and run the `gdbserver'
program. You must tell it (a) how to communicate with GDB, (b)
the name of your program, and (c) its arguments. The general syntax
target> gdbserver COMM PROGRAM [ARGS ...]
For example, using a serial port, you might say:
target> gdbserver /dev/com1 emacs foo.txt
This tells gdbserver to debug emacs with an argument of foo.txt, and to
communicate with GDB via /dev/com1. Gdbserver now waits patiently for
the host GDB to communicate with it.
To use a TCP connection, you could say:
target> gdbserver host:2345 emacs foo.txt
This says pretty much the same thing as the last example, except that
we are going to communicate with the host GDB via TCP. The `host:2345'
argument means that we are expecting to see a TCP connection from
`host' to local TCP port 2345. (Currently, the `host' 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 GDBs `target
remote' command, which will be described shortly. Note that if you
chose a port number that conflicts with another service, gdbserver will
print an error message and exit.
On some targets, gdbserver can also attach to running programs. This
is accomplished via the --attach argument. The syntax is:
target> gdbserver COMM --attach PID
PID is the process ID of a currently running process. It isn't necessary
to point gdbserver at a binary for the running process.
Usage (host side):
You need an unstripped copy of the target program on your host system,
since GDB needs to examine it's symbol tables and such. Start up GDB
as you normally would, with the target program as the first argument.
(You may need to use the --baud option if the serial line is running at
anything except 9600 baud.) Ie: `gdb TARGET-PROG', or `gdb --baud BAUD
TARGET-PROG'. After that, the only new command you need to know about
is `target remote'. It's argument is either a device name (usually a
serial device, like `/dev/ttyb'), or a HOST:PORT descriptor. For example:
(gdb) target remote /dev/ttyb
communicates with the server via serial line /dev/ttyb, and:
(gdb) target remote the-target:2345
communicates via a TCP connection to port 2345 on host `the-target',
where you previously started up gdbserver with the same port number.
Note that for TCP connections, you must start up gdbserver prior to
using the `target remote' command, otherwise you may get an error that
looks something like `Connection refused'.
You have to supply the name of the program to debug and the tty to communicate
on; the remote GDB will do everything else. Any remaining
arguments will be passed to the program verbatim.
`gdb' entry in info; Using GDB: A Guide to the GNU Source-Level Debug-
ger, Richard M. Stallman and Roland H. Pesch, July 1991.
Copyright (c) 1993 Free Software Foundation, Inc.
Permission is granted to make and distribute verbatim copies of this
manual provided the copyright notice and this permission notice are
preserved on all copies.
Permission is granted to copy and distribute modified versions of this
manual under the conditions for verbatim copying, provided that the
entire resulting derived work is distributed under the terms of a permission
notice identical to this one.
Permission is granted to copy and distribute translations of this manual
into another language, under the above conditions for modified versions,
except that this permission notice may be included in translations
approved by the Free Software Foundation instead of in the original
Cygnus Support 2 November 1993 gdbserver(1)
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