Date:	Thu, 4 Feb 1999 13:25:47 +0200 (IST)
From:	Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
X-Sender:	eliz AT is
To:	silkwodj AT my-dejanews DOT com
cc:	djgpp AT delorie DOT com
Subject:	Re: executible formats
In-Reply-To:	<799uob$ku3$1@nnrp1.dejanews.com>
Message-ID:	<Pine.SUN.3.91.990204132517.7801I-100000@is>
MIME-Version:	1.0
Reply-To:	djgpp AT delorie DOT com

On Wed, 3 Feb 1999 silkwodj AT my-dejanews DOT com wrote:

> P.S.  I tried to reproduce a DPMI call (segment_to_selector) by preparing my
> own NASM function, based on the wrapper source.  Worked fine in DJGPP.  Took
> the same module with the int 33h call and assembled to WIN32 (OBJ) and linked
> with MSVC(either 4.2 or 5.0, I forget) compiled fine, but execution locked up
> the machine with a black screen (really scarry).  Am I bumping into something
> new?

AFAIK, this is just one of those free gifts you get from Microsoft:
Win32 programs cannot issue software interrupts, including Int 31h
(I'm guessing you meant 31h and not 33h, which is a mouse interrupt),
because the software interrupt handler is in the VMM which assumes the
caller is 16-bit code, and thus only saves the 16-bit registers on the
stack.

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