Hi,
On Thu, Jul 10, 2014 at 5:30 PM, Jim Michaels <jmich...@yahoo.com> wrote:
>
> seg:ofs=(seg*16)+ofs=(seg<<4)+ofs (note that it is not bit or, it is
> addition). translation of such an address is
> I think requires some macros or functions in DJGPP C/C++ compiler which uses
> protected mode (or other
> dos extenders) because of the 32bit flat addressing. C/C++ could be fast
> enough,
Just to clarify:
DJGPP does not use an "extender" but instead is pure DPMI (0.9 or
higher) "only", ever since v2 debuted (circa 1996). DJGPP requires a
386 or higher and a 32-bit DPMI host, but DPMI itself can also
(optionally) support 286 machines (like old Borland compilers) as
well. So DPMI is not always "32-bit".
> you may have to write your proc using GAS in ASM {} I think it is in the C
> compiler using AT&T assembler syntax.
GAS has (also) supported (optional) "intel" syntax since 2.11 or such,
many many years ago. Latest BinUtils (at least for DJGPP) is 2.24r2,
so that should be no problem.
Even beyond that, both NASM and YASM support DJGPP's COFF format. Both
of them support "intel" natively (although YASM has an optional AT&T
parser as well).
> while this would be a fun project for me to do, DJGPP is unavailable to me as
> of yet because the
> windows version is still under development.
I hope this doesn't come across as too glib or too obvious, so please
don't take offense, but ....
DJGPP has no "Windows version". It's a pure DOS compiler only. There
is no Windows support. None is in the works. None was ever made. (I'm
aware of very very small and obscure and incomplete hacks like RSXNT,
but those don't count. Or at least haven't counted, even unofficially,
since 15 years ago.) The only thing "Windows" about DJGPP is its
occasional use on NTVDM (with its buggy DPMI server) on such OSes as
WinXP or (much less functionally) later versions.
"Still under development" ... hardly. There is no work towards Windows
support at all. Volunteers are few. There is no PE/COFF support. It
does not access any Windows APIs directly. There is no support for
(PE/COFF) .DLLs. It was not supposed to. The whole idea of DPMI was to
extend DOS and play well in both native DOS and Windows and other
compatibles (e.g. OS/2). Obviously Windows doesn't care about that
anymore.
DJGPP cannot currently even pretend to care about Windows. It's still
"DOS only". I'm not saying it isn't possible, of course, and who knows
what people have in mind. But as of right now it's just not there, not
even a little.
> and I would not know how to submit this project to the FreeDOS FTP area. I
> have tried before and failed.
You mean iBiblio? They long ago disabled anonymous FTP submissions. I
don't know why, probably for security reasons.
If you have any (free/libre, "four freedoms") software that you want
someone to mirror to iBiblio, feel free to contact Jim Hall, Mateusz
Viste, or me. (Or maybe others too, Aitor? Dunno.)
> well, that's enough food for thought for whoever is getting started. that's
> enough info to get the project rolling.
> I wish I had my DOS dev environment working!
What environment? Can't you use RUFUS or VirtualBox or similar?
There is a public DJGPP cross-compiler (thanks to Andrew Wu), but I've
still got it sitting here unused. I haven't found the energy to test
it out much. It's still not "Windows", but it will cross-compile (to
DOS) at least from modern Windows (even 64-bit).
https://github.com/andrewwutw/build-djgpp/releases
http://www.bttr-software.de/forum/board_entry.php?id=13451#p13451
EDIT: It seems to work okay, although silly avast! antivirus decided
to make it 10x slower by checking every .EXE that was run, sigh.
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