Calling 16 bit APIs from 32 bit programs

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#3260

From: Timo Tapio Hakulinen
Date: Mon, 04 Jan 1993 20:29

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I need to call OS/2 16 bit APIs from 32 bit C-code (GCC) and assembler
routines, but this seems to be fairly tricky business.  It's possible to
create a small assembler module to convert calling convention from the
standard C-convention into the Pascal-type calling sequence required by the
16 bit APIs, but I'm having trouble with declaring the 16 bit and 32 bit
code and data segments properly.  LINK386 keeps whining about this and that.
I've got adequate documentation about 16 bit APIs but virtually nothing about
32 bit system programming in OS/2, so much of what I'm doing is based on
guesswork and MASM 5.0 manual.  I wonder if anyone has a working chunk of
code / other info demonstrating how to make 16 bit system calls from 32 bit
segments and, more generally, how to perform cross-calling between 16 bit
and 32 bit segments, possibly sharing data among functions.

Cheers,

Timo
-----------
Timo Hakulinen
(thakulin@hila.hut.fi, thakulin@vipunen.hut.fi)

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From: thakulin@vipunen.hut.fi (Timo Tapio Hakulinen)
Subject: Calling 16 bit APIs from 32 bit programs
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Date: 4 Jan 93 20:29:03
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