[ECOS] Problem on GDB Stub on Leon2

[ECOS] Problem on GDB Stub on Leon2

[davarn]

Hello,

I worked on a Leon2 processor, and i have the same trouble as you had, on
Ethernet and serial link.
I wonder how do you correct this trouble.

David ARNAUD

Re: GDB question.

    * From: Ottawa Guy <ottawaguy81 at yahoo dot com>
    * To: Gary Thomas <gary at mlbassoc dot com>
    * Cc: ecos-discuss at sources dot redhat dot com
    * Date: Mon, 9 Feb 2004 15:33:27 -0800 (PST)
    * Subject: Re: [ECOS] GDB question.

Hi Gary,
Thanks for your response, I am writing the STUB code
for SPARC simulator. It turns out that the Uart I/O
function was returning "char" and ECOS converts the
"char" to a int. Since the coversion process failed,
ECOS GDB stub keeps on sending the same response over
and over again. Once I realized that, it fixed some of
my problems.
       Hadi

--- Gary Thomas <gary@mlbassoc.com> wrote:
> On Fri, 2004-02-06 at 23:15, Ottawa Guy wrote:
> > Hello,
> > I am very new at implementing GDB stuff. I have
> > simulator which can a talk to a GDB host software
> > throught a serial port. I loaded GDB stubs in my
> > simulator and called "breakpoint()".
>
> What kind of simulator is this?  Who wrote the GDB
> stubs that
> run on the simulator?
>
> >
> > I start my gdb host program, and type the
> following
> >
> > (gdb) target extended-remote /dev/ttyS0
> > Remote debugging using /dev/ttyS0
> > Couldn't establish connection to remote target
> > Malformed response to offset query,
> > T0544:00000000;0e:00000000;
> > (gdb)
> >
> >
> > I found the GDB host was sending "+$Hc-1#09" to my
> > target.
> >
> > It seems my GDB stub program keep on sending
> > "T0544:00000000;0e:00000000" string I have no idea
> > why.
>
> This is an indication from the remote system that it
> has stopped,
> probably abnormally.  It most likely means that your
> stubs are not
> working properly.  The fact that the values are 0
> also implies that
> there is something wrong at the other end.
>
> >
> >
> > Can someone let me know what are the sequence of
> > events suppose to happen at the target when  the
> GDB
> > host request for a connection. By that I mean when
> the
> > GDB host type "target extended-remote /dev/ttyS0"
> what
> > should be the sequence of response expected from
> the
> > target.
>
> The actual request/reply script will differ from
> platform to platform
> and architecture to architecture.  To understand
> this completely, you'll
> need to read about the GDB remote protocol.  If you
> are running Linux,
> you can get a very complete description from "info
> gdb"
>
> Gary Thomas <gary@mlbassoc.com>
> MLB Associates
>


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    * References:
          o Re: GDB question.
                + From: Gary Thomas

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