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From: Rugxulo <rugxulo AT gmail DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Please help resurrecting GDB for version 7.0 release
Date: Sat, 16 May 2009 15:22:24 -0700 (PDT)
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

Hi,

On May 14, 7:04=A0pm, "Charles Sandmann" <cwsd DOT  DOT  DOT  AT earthlink DOT net> wrote:
>
> >"Rugxulo" <rugx DOT  DOT  DOT  AT gmail DOT com> wrote in message
> >news:b557d9b0-953a-4fa1-8c30-e46ec40f4943 AT r13g2000vbr DOT googlegroups DOT com..=
.
> >How are you supposed to know that SSE is enabled? Either run, crash,
> >recover ...
>
> Establish error handler, try instruction, on fault you know it's
> not legal, set flag, etc. =A0Really very easy to implement.

Maybe for you!   :-)    Anyways, luckily we don't have to do that,
just see if FXSAVE saves the XMM* regs part, if not then it's not
enabled. But I guess you mean the other way isn't so impossible.

> >I wish I was smart enough to make DJGPP (EMU387.DXE, perhaps?) emulate
> >the CMOV.. instructions.
>
> If you look at libc, and the interface to emu387, you could easily
> implement this (probably all from C). =A0Contact me offline if you
> need technical assistance.

I did look at it, but it was a bit over my head. It should be pretty
easy since the CMOV.. instructions (12?) have very similar / simple
encodings. (Note that I'm not referring to the FCMOV.. FPU
instructions, only the main vanilla ones.)