Re: [ECOS] GDB question.

[Ottawa Guy <ottawaguy81 at yahoo dot com>]

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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