Date: Wed, 11 Feb 1998 18:40:12 -0800 (PST)
Message-Id: <199802120240.SAA17054@adit.ap.net>
Mime-Version: 1.0
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To: mgaugy AT ix DOT netcom DOT com, djgpp AT delorie DOT com
From: Nate Eldredge <eldredge AT ap DOT net>
Subject: Re: Cross-Platform Porting from DJGPP
Precedence: bulk

At 09:34  2/10/1998 -0800, Michael Gaugy wrote:
>Howdy,
>
>  I am working on an OS that I have developed on my own.  I would like
>to use
>DJGPP to develop parts of the system that are just too long to
>hand-write in assembly.
>The OS runs in native 32-bit mode with full protection on 386+ machines.
>
>  Can the DJGPP port of GCC be used to generate code that does NOT have
>the
>protected-mode entry and exit points tacked on.
Sure, it's just a matter of linking with startup code that you've written
yourself. Looking at the `ld' docs will probably make that task clear.
You may also want to use a binary format other than COFF. That will require
reconfiguring and rebuilding the Binutils, but that's apparently not too hard.
>  Also, since I am considering porting the GCC compiler itself, can
>anyone point to
>where I can find the info.  I found docs on how to change the machine
>description files,
>but nothing on setting the actual OS-specific configuration
The whole second half of the GCC documentation talks solely about porting.
As I understand it, there are a few files which go into a configuration. I
believe the one you are interested in is the host header file. This is
described in the Info node "Config". There is also a host-specific Makefile
fragment, see the "Fragments" node.

Nate Eldredge
eldredge AT ap DOT net