mirror of
https://github.com/darlinghq/darling-gdb.git
synced 2024-11-26 21:40:38 +00:00
94 lines
3.7 KiB
Plaintext
94 lines
3.7 KiB
Plaintext
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 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:
|
|
|
|
Currently, the only target system supported by the server is 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 --target 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...
|