From:	John Hosick <phosick AT atikokan DOT lakeheadu DOT ca>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Extended Inline Assembly Help
Date:	Fri, 07 Aug 1998 20:41:03 -0700
Organization:	Lakehead Universtiy
Lines:	24
Message-ID:	<35CBC8CE.4BB4@atikokan.lakeheadu.ca>
NNTP-Posting-Host:	atik2-23.lakeheadu.ca
Mime-Version:	1.0
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Someone please help me. I bought a book that uses Intel assembly and but
I'm using DJGPP so I have to use AT&T assembly syntax. To switch to mode
3h I use the following procedure:

void set_video_mode (int vid_mode)
{
   asm ("movb $0, %%ah\n\t"
        "movb $vid_mode, %%al\n\t"
        "int $0x10\n\t"
        : /* no output registers */
        : "al" (vid_mode)
        : "ah", "al");
}

When I compile the program it says:

Error: graph.o: In function `set_video_mode':
graph.c(20) Error: undefined reference to `vid_mode'

What does this mean? And how do I fix this?
Also is there a book out there which teaches AT&T assembly language
syntax?

John Hosick

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