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gdbserver(1)		     GNU Development Tools		  gdbserver(1)

       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 `gdb-
       server' 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	neces-
       sary 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 exam-

	    (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 com-
       municate	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  per-
       mission notice identical	to this	one.

       Permission  is granted to copy and distribute translations of this man-
       ual into	another	language, under	the above conditions for modified ver-
       sions,  except  that this permission notice may be included in transla-
       tions approved by the Free Software Foundation instead of in the	origi-
       nal English.

Cygnus Support			2 November 1993			  gdbserver(1)


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