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Path: utzoo!linus!philabs!cmcl2!seismo!brl-tgr!tgr!Brzozowski@his-phoenix-multics.arpa
From: Brzozowski@his-phoenix-multics.arpa
Newsgroups: net.micro
Subject: Re: DOS EXEC FUNCTION CALL
Message-ID: <1267@brl-tgr.ARPA>
Date: Thu, 5-Sep-85 18:53:43 EDT
Article-I.D.: brl-tgr.1267
Posted: Thu Sep  5 18:53:43 1985
Date-Received: Sun, 8-Sep-85 09:54:28 EDT
Sender: news@brl-tgr.ARPA
Lines: 15


   The basic problem with executing the EXEC call from TURBO is the
fact that the interrupt will not guarantee to restore any registers
except the CS and the IP.  Which means that the data, and stack
segments are not through your current segment registers. Which means
when you return back to TURBO all your stack and data is garbage. The
solution is to push all your necessary registers and then save the SS
and SP in a location in your code segment.  (I would have tried this
on a program I was working on a while back but I didn't have the
intestinal fortitude to write such a thing in inline code...)

Good luck!

Gary Brz...
(Brzozowski%pco@CISL-SERVICE-MULTICS)