RE: [Rcxemul-discussion] Debugger

[David E. <d.a...@du...>]

Hi.

The debugger wouldn't be for debugging programs (perhaps would be useful
when writing firmware). It's really to ensure the emulator is doing what
it should do. At the moment it's virtually impossible to do this without
generating hundreds of megabytes of text output (I currently output
every instruction as it is executed, with a bit of information about it
(such as register contents, memory contents, etc.)). That's all well and
good, but I have to check instructions after firmware has been
downloaded (takes 5 minutes or so).

The other alternative is to use the breakpoint functionality that is in
there, and do a hack which means that instructions are only output after
the breakpoint is reached. 

At the moment, I'm trying to figure out why the emulator isn't
responding to the 'unlock firmware' opcode, and it's proving extremely
difficult, hence the idea of a debugger....

> Debugging in a mixed code environment is going to be hard,
> since you can't use the JDI and related technologies on C 
> code.  Just attach a debugger (gdb most likely) to the 
> process.  Doing a Java version would require lots of 
> communications code, reporting about the next instruction to 
> be executed by the virtual processor, and then the Java app 
> sending a respose whether or not to execute that instruction.
> 
> ----- Original Message -----
> From: "David Edwards" <d.a...@nt...>
> To: <rcx...@li...>
> Sent: Thursday, October 17, 2002 9:49 AM
> Subject: [Rcxemul-discussion] Debugger
> 
> 
> > Hi.
> >
> > Is anyone interested in helping create a debugger (in Java) to
> > accompany
> my emulator? I'm getting to the point where I need to break
> into certain functions to see what's happening (specifically 
> to try to work out why no response is being generated when 
> unlock firmware is called).
> >
> > I plan on making "debug" a compilation option of the
> emulator to avoid
> unnecessary overhead.
> >
> > Any takers?
> >
> > Dave.
> >
> >
> >
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