[NTLK] Geek Alert: NewtonOS

Gerry Martinez gerry.martinez at gmail.com
Wed Sep 3 13:31:51 EDT 2014


On Wed, Sep 3, 2014 at 12:16 PM, Matthias Melcher <mm at matthiasm.com> wrote:

> Geek alert, part n of m.
> I added soe funny code to the SVN repository today. The code itself is
> completely independent of Einstein or NewtonOS, but it uses functions from
> inside NewtonOS, which were automatically translated from ARM to pseudo-C.
> But let me explain (since you made it all the way to this line).
> .../src/Newt/NewtSim.cp is the main entry point of a new tiny program
> named NewtSim which simply puts four strings into a queue, then retrieves
> and prints them, then removes them one-by-one from the queue.
> This sure sounds boring - there is a C++ template for doing just that - so
> why do I write home about that?
> Well, NewtSim uses part of the NewtonOS to achieve this. The NewtonOS
> class is called "TSingleQContainer" and is implemented in the developer ROM
> starting at 0x001E2BBC. It was originally written in C++ and compiled into
> ARM code.
> Einstein has a builtin assembly code Monitor which converts ARM code back
> into Pseudo-C++. The resulting code is ugly and possibly inefficient, but
> it can be compiled again (for example, into Intel code), and - and that is
> the important part - works just like the original C++ code.
> The translation for these six functions was fully automatic. The same
> pseudo-C code now works for Einstein, just as it works for NewtSim. It's
> the exact same source code, but it created entirely different machine code
> for each case.
> And since you have been following me for a while, you know that this means
> we can translate the entire ROM into Pseudo-C and back into native code -
> in theory at least. I will continue my mission, awaiting the obstacles
> ahead. I am now attacking the TInterpreter class.
>  - Matthias
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*Gerry Martinez, RN, CCRNTeam Coordinator, Pediatric Transport
TeamChildren's Hospital of San Antonio*

*210-704-3831 office210-316-2181 cell*

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