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From: "Charles Sandmann" <cwsdpmi AT earthlink DOT net>
Newsgroups: comp.os.msdos.djgpp
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Subject: Re: Please help resurrecting GDB for version 7.0 release
Date: Sun, 3 May 2009 13:35:55 -0500
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

>"Eli Zaretskii" <eliz AT gnu DOT org> wrote in message 
>news:83ws8zeb05 DOT fsf AT gnu DOT org...
>> From: "Charles Sandmann" <cwsdpmi AT earthlink DOT net>
>> >"Eli Zaretskii" <eliz AT gnu DOT org> wrote in message
>> >Yes, for the same reason: it thinks DJGPP supports SSE registers.
>> What is required to make that work?
> There are 2 possible fixes: the easy one and the more complicated one.
>
> The easy one is a two-liner: tell GDB that we don't support SSE.  I
> already did that, and the patch is in the GDB CVS repository since
> about 2 days ago.

OK, that seems to be reasonable.  I suspect that any SSE capable
software will probably be written on other platforms and rarely
debugged at the register level with DJGPP (mostly ported).

> The more complex solution is to extend save_npx and load_npx to use
> FXSAVE and FXRSTOR instructions, when they are available, instead of
> FNSAVE and FRSTOR that we use now.

Rugxulo did convince me to update CWSDPMI to support SSE, which
was a good thing.  But needing to debug is another issue, agreed.  There
are the complications of determining support, etc, making sure you don't
break old platforms.  Not worth the hassle.
(For someone wanting to work on this, the referenced code is in dbgcom.c).