Re: GCJ on arm-linux

[David Daney <ddaney at avtrex dot com>]

Casey Marshall wrote:
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> Hi guys.
>
> I'm looking into running GCJ on an arm-linux system, and from some
> searching it looks as though we do not yet have full support for this
> platform. Is this right?
>
> My understanding is that some of the hairy bits for handling null
> dereferences, and libffi, are currently missing. Is there anything else
> missing?

Probably you will want to write an MD_FALLBACK_FRAME_STATE_FOR for 
arm-linux (goes in gcc/config/arm somewhere).

Locking? sysdeps/arm is missing.

You mentioned libffi closures for arm I think.

Some configure hackery to get it to use all the new things.

Anthony Green mentioned that Craig Vanderborgh <craigv@voxware.com> has 
arm-wince working and is willing to share.  You could ask him for 
code/pointers.

> How should I go about determining what's missing, and what is necessary
> to implement proper arm-linux support? This stuff feels under-documented.

But this should not surprise you.  You have been doing quite a bit of 
libgcj hacking.

You mentioned the major missing parts I think.  It is an iterative 
process.  With MIPS I spent some time comparing the code generated for 
x86 and mips to see where the missing parts were.

> Thanks.

No, thank you.
Please finish soon, it could save me a lot of work.

David Daney


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