Date: Wed, 6 Mar 1996 02:13:58 -0800 (GMT)
From: "Rafael R. Sevilla" <rsevilla AT upd DOT edu DOT ph>
To: djgpp AT delorie DOT com
Subject: Help with assembler in djgpp
Message-ID: <Pine.SOL.3.91.960306015101.4871A-100000@sauron>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII

I'm a new user to djgpp and I've got a question regarding its usage of
assembly language. I learned to write 80x86 assembler before I learned C,
and switching from the traditional Intel assembler opcodes to the very
weird AT&T standard codes that are used by the GNU Assembler that comes
with djgpp is rather harsh for me. Also, I've been trying to read such .s
files other people have written, and what I'll say is it's not easy for a
guy who learned 80x86 assembly right after BASIC. Is there a converter
program (in sed or awk) or a shell script in Unix that performs conversion
both ways? I've read about the sed script which did that which was posted
on the mail archives that converts standard 80x86 code into AT&T format, 
but I need one that also works in the opposite direction. 

And also another question. When we write an assembler routine in djgpp
that is called by a C function, do the usual BP addressing techniques used
in real mode DOS still work the same way? Does it still follow the large-
model convention of BP+6 pointing to the first parameter after having
pushed the old value of BP? Or must I use EBP to do the same thing, and
therefore EBP+10 (the pushed EBP being 32 bits and all, plus the 48-bits
of CS:EIP...)? This was one crucial issue which was not addressed by the
FAQ at all. I've been writing such low-level interfaces to assembler for
years, and I'd like to know how it's done in this new system.

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University of the Philippines                           Rafael R. Sevilla
PABX/OVCA: UP Internet Engineering Project            rsevilla AT upd DOT edu DOT ph
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P.S. I've got half the mind to write a version of the djgpp assembler 
that accepts standard Intel code! Bison should help, as should Flex...

RTFM?! RWFM? TINFM!