From:	Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Compile in raw binary
Date:	Fri, 07 Apr 2000 17:30:33 +0200
Organization:	NetVision Israel
Lines:	31
Message-ID:	<38EDFF19.E81A2138@is.elta.co.il>
References:	<8ck4q5$oob$1 AT mail DOT pl DOT unisys DOT com>
NNTP-Posting-Host:	ras1-p49.rvt.netvision.net.il
Mime-Version:	1.0
X-Trace:	news.netvision.net.il 955121349 5005 62.0.172.51 (7 Apr 2000 15:29:09 GMT)
X-Complaints-To:	abuse AT netvision DOT net DOT il
NNTP-Posting-Date:	7 Apr 2000 15:29:09 GMT
X-Mailer:	Mozilla 4.7 [en] (Win98; I)
X-Accept-Language:	en,ru,hebrew
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

Aquaz wrote:
> 
> Hi all!
> I'm a c/c++ developer but new about djgpp compiler.
> Is it possible compile a simple c code into raw binary x86 opcodes, similar
> the .COM file?

Not really.

> int main(void) {
>     register x;
>     x = 0;
>     ...
>     return(0);
> }
> 
> Can i build it to have a file like:
>     B8 00 00 ... CB
> (that would be "mov ax, 0 ... retf" )

You could compile the source ("gcc -c foo.c"), then convert the object file
to the raw binary format, like this:

	objcopy --output-target=binary foo.o foo.bin

The file foo.bin will include only the opcodes produced by the compiler from
the C code.  Note that the code produced by the compiler from the above
source is VERY different from what you think.

Anyway, you really should explain what do you need this for, because that
would allow to give you more accurate advice.

- Raw text -