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From: joshhighley@hotmail.com (Josh Highley)
Subject: What's wrong with this simple Ada w/ assembly code?
Date: 1999/03/03
Message-ID: <36ddb9aa.0@silver.truman.edu>#1/1
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Content-Type: Text/Plain; charset=US-ASCII
Organization: Missouri Research and Education Network
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Newsgroups: comp.lang.ada
Date: 1999-03-03T00:00:00+00:00
List-Id: <comp.lang.ada>

  I'm trying to link some really simple assembly code with Ada.  I 
haven't been able to find any good examples or explanations on how to do 
this.  I didn't want to do it, but I guess this is the quickest way to 
get a solution that I can then work/experiment with.  I think I'm close 
to getting this but I'm not sure what I need to do.  I want to use 
assembly to position the cursor on the screen.  At this point, I've 
hard-coded the location into the code, but after I get this working, 
I'll pass a row and column from the Ada program.  Here's the code I've 
been experimenting with:

; I have A86 on my PC so my assembly code is a .com   I have access to 
; MASM, though, if needed.  "moveto.asm":

page 60, 132
title moveto
codesg segment para 'code'
   assume cs:codesg, ds:codesg, ss:codesg, es:codesg
   org 100h
   jmp moveto
;-------------------
 row db 15
 col db 20
;-------------------
moveto proc near
   mov ah, 02h
   mov bh, 00
   mov dh, row
   mov dl, col
   int 10h

   mov ax, 4C00h
   int 21h
moveto endp
codesg ends
end
-------------------------------------------------------------------
Here's the Ada code.  I'm using GNAT 3.11, AdaGIDE 6.21, and Win95.
-----------------
with ada.text_io;
use ada.text_io;

procedure assembly_test is
    pragma Linker_Options("c:/gnat311/programs/moveto.obj");
        procedure moveto;
        pragma import (Assembler, moveto, "moveto");
begin  -- assembly_test
    moveto;
    put("Here it is.");
end assembly_test;
-------------------------

Everything I have so far is from a response to a less specific assembly 
with Ada question I posed earlier, and from looking at a few packages 
that link C code. I assembled the code using A86 to a .com file which 
also yielded an .obj file and .sym file.  The Ada compiles fine, but 
when I build it, I get the message "c:/gnat311/programs/moveto.obj: file 
not recognized: File format not recognized    gnatmake: *** link failed"
  
What do I need to do to make this code work? Also, are there any books 
or Internet sources that have good explanations and/or examples on 
using assembly from Ada? I hate to keep bothering this newsgroup with 
questions that are no doubt basic to people who know how to do this.

Thanks,

Josh Highley
joshhighley@hotmail.com