>From: Andrew Cagney <ac131313@redhat.com>
>To: liu lijuan <lljchina@hotmail.com>
>CC: gdb@sources.redhat.com
>Subject: Re: command line interface
>Date: Thu, 06 Mar 2003 15:20:39 -0500
>
> >
> >    Does the communication between gdb and compiled-in target simulator 
follow any rules? for example,there is "remote debug interface " between 
gdb and ARMulator,and "remote serial protocol"between gdb and remote 
target.
> > the compiled-in simulator receive the command from gdb command line 
interface and return the info to gdb.how to deal with the procedure?Is 
there any protocol?
>
>`it depends'
>
>A few, but not many, simulators allow sim specific commands via the
>`sim' command prefix.  The MIPS is one, I don't think the arm is one 
though.
>
>Andrew


I don't understand your answer very clearly.Do you mean that gdb transfer 
command to simulator via "sim <command>"? What I want to say is how gdb and 
simulator deal with their commands .for example, when you open a exec file 
to debug,then connect this to simulator via "target sim",then load this 
file to simulator,at last you can debug it with all kinds of commands.I 
just want to make this procedure clearly.How can gdb and simulator identify 
the commands from one to another?


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