Re: GDB Stub & GPL question

[veenu khanna <veenu_khanna at yahoo dot com>]

HI Daniel,
I am still unclear. :(
You mean to say that if we implement our own stub for gdb then it HAS to be a serial connection. It can  not be IP based. 

I have another question as well.
We are pondering over the idea to implement a gdb & gdbserver/stub solution for our proprietary OS (embedded arch) And I have few doubts about the viability.
It seems that multiple instances of gdbserver needs to be launched to connect it to multiple processes. Is there a way to debug multiple processes with single gdbserver instance ? 
Say we write our own command in gdb to list all the processes in our OS. And then we do an attach from gdb like attach <pid> .

Do you have any leads/ideas about how have people handled this problem ? Is it do-able ? or the only way to debug multiple processes is to have multiple instances of gdbserver. 


Thanx in advance 


----- Original Message ----
From: Daniel Jacobowitz <drow@false.org>
To: veenu khanna <veenu_khanna@yahoo.com>
Cc: gdb@sourceware.org
Sent: Wednesday, January 31, 2007 4:04:48 PM
Subject: Re: GDB Stub & GPL question

On Wed, Jan 31, 2007 at 07:02:04AM -0800, veenu khanna wrote:
> Hello
> I have a question regarding implementing a remote stub. Say we have to implement/extend a stub for x86 architecture with our own OS.
> IN section for "Implementing a remote stub (Section 17.5.3)" in "Debugging with GDB" document there is a point
> "Make sure you have a serial connection between your target machine and the gdb host,
> and identify the serial port on the host."
> 
> Does this mean that GDB on host and GDB agent/stub on the target can only talk on a serial port ? 
> 
> And in point 7 it says "Start gdb on the host, and connect to the target" in which TCP connection is allowed as well.
> 
> Can someone help me in getting things right ? 
> I know that it is possible to have a TCP communication between gdb and gdbserver. 
> Is there a support for the same for stubs ? 

Yes, it's exactly the same - I'm sorry the manual is unclear.

> Another question is regarding GPL...
> some part of stub code will be residing in our kernel which is proprietary. 
> Does that mean we will have to release the code for kernel as well ? 

If you copy the stub from the GDB source tree, then yes you would
have a GPL problem.  I recommend writing one from scratch, instead,
based on the documentation - that's what most people seem to do.
The examples in GDB are quite old.

-- 
Daniel Jacobowitz
CodeSourcery





 
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