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<TITLE>The Answer Guy 44: Assembly Language Programming for an old DESQview User</TITLE>
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<H4>"The Linux Gazette...<I>making Linux just a little more fun!</I>"</H4>
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<H1><A NAME="answer">
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<H4>By James T. Dennis,
<a href="mailto:linux-questions-only@ssc.com">linux-questions-only@ssc.com</a><BR>
LinuxCare,
<A HREF="http://www.linuxcare.com/">http://www.linuxcare.com/</A>
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<H3 align="left"><img src="../../gx/dennis/qbubble.gif"
height="50" width="60" alt="(?) " border="0"
>Assembly Language Programming for an old DESQview User</H3>
<p><strong>From Ed Damvelt on Mon, 19 Jul 1999
</strong></p>
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Assembly Language Programming for an old DESQview User
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:: -->
<P><STRONG>
Good evening.
</STRONG></P>
<P><STRONG>
I saw your answer to a question regarding Desqview386 and your
recommendation of Linux.
</STRONG></P>
<P><STRONG>
From 1985 until eight years ago, when I moved from Europe to Mexico, I
made industrial automation programs (assembler for all routines and MS-C
just to compile it, because my data base/index file software is in C)
and complete hardware, running, if necessary, under Desqview386. Since I
am here I have not been active in this field, so I lost a bit the
thread.
</STRONG></P>
<P><STRONG>
Nevertheless, recently I started engineering in automation again, and
want my programs to run in ASM again. I thus need a multitasking
environment and Linux seems to be the proper choice nowadays; I am one
of the Windows-haters, but forced to use it still. For me the questions
now are: What conventions must the assembler file answer to in order to
run under Linux? Search as I did, I only found info about how to run
existing programs, not how to program myself. Can you tell me where to
find this info? Are there ASM- and C-compilers to have for Linux? Yes,
where? What is there to do to run multiple programs? Etc. I guess you
got the gist of my needs. I do hope that I do not have to re-write my
whole ASM-library; it cost me a lot of time to write identical
procedures to MS-C and, where convenient, Turbo-Pascal in such way, that
they are much more efficient, practically insensitive to type/pointer
mix-up and much faster.
</STRONG></P>
<P><STRONG>
I really would appreciate getting some pointers to search variables from
you.
</STRONG></P>
<P><STRONG>
Regs,
Ed Damvelt.
</STRONG></P>
<BLOCKQUOTE><IMG SRC="../../gx/dennis/bbub.gif" ALT="(!)"
HEIGHT="28" WIDTH="50" BORDER="0"
>
Well, assembly language programming is rare in any form of
UNIX. However, it is somewhat better supported under Linux
than under most other UNIX variants.
</BLOCKQUOTE>
<BLOCKQUOTE>
I'm not an assembly programmer per se, though I have
played with Z-80, 6502, and 8086 assemply.
</BLOCKQUOTE>
<BLOCKQUOTE>
Your best resources for ASM programming under Linux
seem to be:
</BLOCKQUOTE>
<BLOCKQUOTE><DL><DT>
Assembly HOWTO
<DD><A HREF="http://metalab.unc.edu/LDP/HOWTO/Assembly-HOWTO.html"
>http://metalab.unc.edu/LDP/HOWTO/Assembly-HOWTO.html</A>
</DL></BLOCKQUOTE>
<BLOCKQUOTE><DL><DT>
NASM - The Netwide Assembler Project - FREE 80x86 assembler
<DD><A HREF="http://www.web-sites.co.uk/nasm"
>http://www.web-sites.co.uk/nasm</A>
</DL></BLOCKQUOTE>
<BLOCKQUOTE><DL><DT>
asmutils: Linux/i386 assembly programming page
<DD><A HREF="http://lightning.voshod.com/asm"
>http://lightning.voshod.com/asm</A>
</DL></BLOCKQUOTE>
<BLOCKQUOTE>
This last link in particular leads to a small package called
'asmutils' --- which includes straight assembly language
replacements for about thirty small UNIX utilities. There's
even a 757 byte web server. (That was not a typo:
seven HUNDRED and fifty odd BYTES!). All of the others
are smaller. Most of the others are under half that size.
(And those are STATIC BINARIES --- with no dependencies on
any shared libraries).
</BLOCKQUOTE>
<BLOCKQUOTE>
(That's pretty interesting in that "Hello World" compiled
statically under glibc 2.x comes in at 90K (kilobytes). The
assembly language version I cooked up in five minutes using
one of the asmutils programs as a template assembled into
about 90 bytes).
</BLOCKQUOTE>
<BLOCKQUOTE>
So, you and Konstantin Boldyshev (the author of asmutils)
might have quite a bit of fun creating a large suite of
raw assembly language tools for Linux.
</BLOCKQUOTE>
<BLOCKQUOTE>
These will probably be of particular interest to people like
Tom Oehser (maintainer of Tom's Root/Boot, "The most Linux
you can fit on a Floppy) (<A HREF="http://www.toms.net/rb"
>http://www.toms.net/rb</A>) and to
the people who work on embedded Linux systems (who have a
mailing list and an FAQ at <A HREF="http://www.waste.org/~zanshin"
>http://www.waste.org/~zanshin</A>).
(I've copied some of them on this message).
</BLOCKQUOTE>
<BLOCKQUOTE>
In addition to pointing them at these resources (of which
they were probably already aware) this will give them an
opportunity to comment on what I've said and expand the
content (or make corrections). You might want to join
The embedded Linux mailing list (as their interests are
similar, though quite a bit of their work is down in
C, too) and possibly in participating in the Tom's Root/Boot
mailing list or in the asmutils and Lightning Project.
</BLOCKQUOTE>
<BLOCKQUOTE>
Together the micro-Linux (very small distributions like
Toms, LRP, ODL, Trinux, LOAF, etc) embedded, and assembly
language projects form a interesting niche within the Linux
community.
</BLOCKQUOTE>
<BLOCKQUOTE>
Linus has said that the most interesting things
happening in the future of Linux will be on the desktop
and in the embedded realms. I agree.
</BLOCKQUOTE>
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<H5 align="center"><a href="http://www.linuxgazette.com/copying.html"
>Copyright &copy;</a> 1999, James T. Dennis
<BR>Published in <I>The Linux Gazette</I> Issue 44 August 1999</H5>
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