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- 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 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 communicate via
- either a serial line or a TCP connection.
-
- 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 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, 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.
-
- 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'.
-
- Building:
-
- Configuring gdbserver you should specify the same machine for host and
- target (which are the machine that gdbserver is going to run on. This
- is not the same as the machine that gdb is going to run on; building
- gdbserver automatically as part of building a whole tree of tools does
- not currently work if cross-compilation is involved (we don't get the
- right CC in the Makefile, to start with)).
-
- gdbserver should work on sparc-sun-sunos4* or Lynx. The following
- instructions pertain to Lynx. To build the server for Lynx, make a
- new copy of the distribution onto a disk that is NFS shared with the
- Lynx system. Lets say that's in a directory called xyzzy. Then,
- follow these steps under the host system:
-
- 1) cd xyzzy/gdb/gdbserver
- 2) ../../configure i386-none-lynx
-
- When that completes, do the following on the Lynx system:
-
- 3) cd xyzzy/gdb/gdbserver
- 4) make CC=gcc
-
- It should build with only a minor complaint about NULL being redefined. That's
- a LynxOS problem, and can be ignored.
-
- It's also possible that you may have a cross-compiler to Lynx. In that case,
- you can skip the stuff about NFS. You would replace steps 3 & 4 with:
-
- make CC=lynx-target-compiler...
-