Seeking for pointers about creating a custom GNAT runtime

Seeking for pointers about creating a custom GNAT runtime

[Yannick Duchêne (Hibou57)]

Hi all happy Ada prose authors,

I am seeking for some pointers, basic advices, about creating a custom  
runtime for GNAT.

That's basically for a kind of toy for me: a minimal bootable environment  
in which I will mainly play with some assembly and run some experiment.  
However, I will also need a minimal environment, like a minimal text  
editor and a minimal terminal emulation, among others fundamental stuff,  
and don't feel OK doing this in either assembly or C. Note that I am not  
announcing a new OS in Ada, I'm not that silly, that's just planed to be a  
toy for some personal experiments.

Any pointers welcome. I am not expecting anyone to do the stuff for me,  
just pointers.

I find this:
http://www.iuma.ulpgc.es/users/jmiranda/gnat-rts/index.htm
While not sure that's what I need, and above all, it seems outdated (GNAT  
3.15p is from the medieval times of GNAT).

-- 
“Syntactic sugar causes cancer of the semi-colons.” [1]
“Structured Programming supports the law of the excluded muddle.” [1]
[1]: Epigrams on Programming — Alan J. — P. Yale University

Re: Seeking for pointers about creating a custom GNAT runtime

[Yannick Duchêne (Hibou57)]

Le Wed, 25 Apr 2012 10:44:13 +0200, Yannick Duchêne (Hibou57)  
<yannick_duchene@yahoo.fr> a écrit:
> I find this:
> http://www.iuma.ulpgc.es/users/jmiranda/gnat-rts/index.htm
> While not sure that's what I need, and above all, it seems outdated  
> (GNAT 3.15p is from the medieval times of GNAT).

Came to this, which seems more useful:
http://www.iuma.ulpgc.es/users/jmiranda/gnat-rts/node14.htm

There is a reference to a “Common Ada Run-Time System”, alias CARTS. Could  
not find anything online on what seems to be an interesting topic. Do you  
know some links for a description of this CARTS?



-- 
“Syntactic sugar causes cancer of the semi-colons.” [1]
“Structured Programming supports the law of the excluded muddle.” [1]
[1]: Epigrams on Programming — Alan J. — P. Yale University

Re: Seeking for pointers about creating a custom GNAT runtime

[Lucretia]

On Wednesday, April 25, 2012 9:44:13 AM UTC+1, Hibou57 (Yannick Duchêne) wrote:
> Hi all happy Ada prose authors,
> 
> I am seeking for some pointers, basic advices, about creating a custom  
> runtime for GNAT.
> 
> That's basically for a kind of toy for me: a minimal bootable environment  
> in which I will mainly play with some assembly and run some experiment.  
> However, I will also need a minimal environment, like a minimal text  
> editor and a minimal terminal emulation, among others fundamental stuff,  
> and don't feel OK doing this in either assembly or C. Note that I am not  
> announcing a new OS in Ada, I'm not that silly, that's just planed to be a  
> toy for some personal experiments.
> 
> Any pointers welcome. I am not expecting anyone to do the stuff for me,  
> just pointers.

I have done this on an ARM board, see the "blink" directory of https://github.com/Lucretia/tamp, it does nothing but boot on a board. You can apply the same idea for x86, you can use the --RTS flag to point to your new custom RTS.

Luke.

Re: Seeking for pointers about creating a custom GNAT runtime

[Yannick Duchêne (Hibou57)]

Le Wed, 25 Apr 2012 17:24:34 +0200, Lucretia <laguest9000@googlemail.com>  
a écrit:
> I have done this on an ARM board, see the "blink" directory of  
> https://github.com/Lucretia/tamp, it does nothing but boot on a board.  
> You can apply the same idea for x86, you can use the --RTS flag to point  
> to your new custom RTS.

I’m currently reading and looking at it. Your README file is mentioning  
something I forget to think about: ACATS tests. Indeed, I believe many  
ACATS are intended to test the runtime. Thanks for that reminder.

Have a good day Lucrecia

-- 
“Syntactic sugar causes cancer of the semi-colons.” [1]
“Structured Programming supports the law of the excluded muddle.” [1]
[1]: Epigrams on Programming — Alan J. — P. Yale University

Re: Seeking for pointers about creating a custom GNAT runtime

[Randy Brukardt]

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"Yannick Duch�ne (Hibou57)" <yannick_duchene@yahoo.fr> wrote in message 
news:op.wdbbvzqbule2fv@douda-yannick...
...
>I find this: http://www.iuma.ulpgc.es/users/jmiranda/gnat-rts/index.htm
>While not sure that's what I need, and above all, it seems outdated (GNAT 
>3.15p is from the medieval times of GNAT).

What does that make me? Stone age? :-)

Claw was mostly developed with versions of GNAT predating 3.15p (that was 
the first version that was really stable with Claw, with its heavy reliance 
on tagged types and finalization - both very new at the time). And, of 
course Janus/Ada goes back to 1980 (roughly 20 years before GNAT 3.15p).

                                               Randy.