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Stu Grossman 1993-07-08 23:36:48 +00:00
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gdb/gdbserver/README
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This is a test line for tags testing.
README for GDBserver
by Stu Grossman
Introduction:
This is GDBserver, a remote server for Un*x-like systems. It can be used to
control the execution of a program on a target host from a GDB on a different
control the execution of a program on a target system from a GDB on a different
host. GDB and GDBserver communicate using the standard remote serial protocol
implemented in remote.c, and various *-stub.c files. They can communicate via
implemented in remote.c, and various *-stub.c files. They communicate via
either a serial line or a TCP connection.
Usage (server (target) side):
First, you will need to have a copy of the program to be debugged put onto
the target system. It can be stripped if you need to save space. This is ok
because GDBserver doesn't care about symbols, all of that stuff is taken care
of by the GDB running on the host system.
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 will need to log on to the target system, and run the
server program. You will need to tell it how to communicate with GDB, the
name of the program to be debugged, and it's arguments. For example, using a
serial port, you might say:
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 is:
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. The server
will communicate with GDB via /dev/com1. GDBserver will now wait patiently
for GDB to communicate with it.
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
now going to communicate with 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 ports on your
system. This same port number will also be used in the GDB `target remote'
command, which we will discuss later. Note that it's safe to chose a number
that conflicts, gdbserver will just print an error message and exit.
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.
Usage (host side):
You should have a copy of the target program on your host system, since GDB
will need it to examine symbol tables and such. You should start up GDB just
as you normally would, with the target program as the first argument. Ie:
`gdb target-prog'. After that, you will only need to know about one new
command. This is `target remote'. It's argument is either a device name
(preferably of a serial device, like /dev/ttyb), or a host:port descriptor.
For example:
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
will communicate with the server via the hardware serial line /dev/ttyb, and:
communicates with the server via serial line /dev/ttyb, and:
(gdb) target remote the-target:2345
will communicate via a TCP connection to port 2345 on host `the-target', where
you have already started up gdbserver with the same port number. Note that you
must start up gdbserver prior to using the target command, otherwise you will
get an error that looks something like `Connection refused'.
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'.
Building: