Date: Fri, 12 Nov 1999 16:41:44 -0500
Message-Id: <199911122141.QAA13154@envy.delorie.com>
From: DJ Delorie <dj AT delorie DOT com>
To: djgpp AT delorie DOT com
In-reply-to: <382C6D45.1A79EE8A@mtu-net.ru> (alex.fru@mtu-net.ru)
Subject: Re: ".o" object file format
References: <942407183 DOT 281935 AT mao DOT cityline DOT ru> <382C4D8A DOT F87C485 AT roBESTse-hENGINEERINGulmCOLLEGEan DOT eINTHEUSdu> <382C6D45 DOT 1A79EE8A AT mtu-net DOT ru>
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> I know that. But where can I download info on the fromat? I need to
> know it's structure and important fields such as offsets and sizes
> of .TEXT, .DATA, .BSS, ... segments. I need this information because
> I'm going to use DJGPP in order to compile C programs for my new OS
> as well as for DOS and Windows.

http://www.delorie.com/djgpp/doc/coff/

At least, that covers the parts the executable format uses.  You need
to read the BFD sources to get the rest of the info.