llvm dev - Jun 2011 - [LLVMdev] ARM thumb-2 instruction used for non-thumb2 CPUs

Hi Damjan,
> This sounds like a dead end as newer binutils are GPLv3.
Unfortunately, you have to live with this. Until recently binutils
were quite buggy wrt thumb2 code, so, most probably you will need new
binutils in any case.

-- 
With best regards, Anton Korobeynikov
Faculty of Mathematics and Mechanics, Saint Petersburg State University

On 22 June 2011 19:18, Anton Korobeynikov <anton at korobeynikov.info>
wrote:
> Unfortunately, you have to live with this. Until recently binutils
> were quite buggy wrt thumb2 code, so, most probably you will need new
> binutils in any case.
Hi Anton,

It's not so simple. GPL3 can be quite a nuisance to change and even to
use. This is why LLVM is becoming to popular for ARM... ;)

Jim, how much work would you reckon it'll take to have a working assembler?

cheers,
--renato

On Jun 22, 2011, at 2:08 PM, Renato Golin wrote:
> On 22 June 2011 19:18, Anton Korobeynikov <anton at
korobeynikov.info> wrote:
>> Unfortunately, you have to live with this. Until recently binutils
>> were quite buggy wrt thumb2 code, so, most probably you will need new
>> binutils in any case.
> 
> Hi Anton,
> 
> It's not so simple. GPL3 can be quite a nuisance to change and even to
> use. This is why LLVM is becoming to popular for ARM... ;)
> 
> Jim, how much work would you reckon it'll take to have a working
assembler?
> 
You mean to patch the old binutils to support this old instruction? Very easy,
I'd expect (well, as easy as anything ever is in binutils).

To get -integrated-as working so that we don't need to go through the
assembler at all should be mostly a matter of bug fixing, modulo inline assembly
support. For non-trivial inline assembly, and to get a system assembler
replacement based on the MC assembler, it'll be a bigger task. The ARM asm
parser is currently in need of some tender loving care. That's coming soon,
but it's a non-trivial task.

For -integrated-as, I would suggest giving it a try. I'm not completely sure
how complete the support is for ELF, but I think it's in somewhat OK shape,
at least. Worth trying. That would neatly avoid the problem if it works. If it
doesn't, we should fix the bugs so it does. ;)

-Jim