Re: GDB interface with simulator

[John Williams <jwilliams@itee.uq.edu.au>]

Hi Rama,

Rama Singh wrote:
> I am working on a cycle accurate simulator and for the
> purpose of debugging application, I wish to use gdb.
> Now gdb has in build support for about a dozen most
> popular simulators. It interacts with the simulator as
> a library. I wish to use my simulator as an
> independent process running on the same machine or on
> other machine. 
> Is it posible to have gdb interact with a simulator
> over a socket? Also where can I find more information
> on this? I believe that implementing this will involve
> writing a gdb stub that will compile with the
> application and thus interact with the host gdb. Am I
> getting things correctly or is there some other
> possible way too?

Take a look at the gdbserver application, distributed with GDB. 
Speifically, the remote-utils.c file will show you the socket interface, 
and provide some tips on how to implement it.

You basically just implement stubs to read/write memory, query 
registers, set breakpoints, that sort of thing.

Then, read

http://sources.redhat.com/gdb/current/onlinedocs/gdb_33.html

to see the format of the remote debugging packets.

You might just be able to integrate the gdbserver application into your 
simulator.

Good luck,

John