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Date: Tue, 28 Mar 2017 18:47:11 +0300
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From: "Eli Zaretskii (eliz AT gnu DOT org) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
To: djgpp AT delorie DOT com
In-reply-to: <ec865326-58ac-4534-a150-01a09c4e2798@googlegroups.com>
	(djgpp AT delorie DOT com)
Subject: Re: using fs/gs segment registers in djgpp?
References: <ec865326-58ac-4534-a150-01a09c4e2798 AT googlegroups DOT com>
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> Date: Tue, 28 Mar 2017 08:19:11 -0700 (PDT)
> From: "jwjagersma AT gmail DOT com [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
> 
> I was wondering if gcc/djgpp ever uses the fs and gs registers. From disassembling a djgpp-compiled exe, I found some references to fs (no idea what's stored there though) but gs appears unused.

Both are used, although FS is used more frequently.  See
<sys/farptr.h> and <libc/farptrgs.h>; the latter is specifically for
code internal to the library.