Path: utzoo!attcan!uunet!ncrlnk!ncrcae!hubcap!gatech!ncar!tank!shamash!com50!pwcs!stag!daemon
From: to_stdnet@stag.UUCP
Newsgroups: comp.sys.atari.st
Subject: Writing a desk accessory with Sozobon C
Message-ID: <698@stag.UUCP>
Date: 18 Jan 89 17:16:33 GMT
Sender: daemon@stag.UUCP
Lines: 92

From: thelake!steve@stag.UUCP (Steve Yelvington)

Here is the (working!) desk accessory startup module for the free Sozobon
C compiler. This version is written to go with Don Farmer's GEMQ library
of GEM bindings (the files AESQ and VDIQ) and version 2.0 of dLibs.

Assemble this as dastart.o. Link the files like so:

ld -o yourfile.acc dastart.o yourfile.o <other modules?> aesq vdiq dlibs.a

I've tested this with a couple of DA skeleton programs and it seems to
work just peachy.

Incidentally, if you want to write a non-ACC GEM program using the GEMQ
library, you'll need to extract the _crystal: function from this module,
assemble it separately (call it crys.o or something) and link it before
AESQ.


________cut  o/__________________________________________
        here o\

**************************************************************************
* dastart.s: GEM desk accessory startup code                             * 
*            for Sozobon C and dlibs v.2.0                               *
*            Public domain 1989 -- Steve Yelvington (steve@thelake.UUCP) *
*            thanks to kbad, ian, cjp, dal & jls                         *
*            Assemble this as dastart.o and use instead of dstart.o      *
**************************************************************************

	.bss		* first, we set up a stack
	.even
stackbottom:
	.ds.l 	1024
initstack:
	.ds.l	1
saveret: 		* for gemdos etc. bindings; delete if not needed
	.ds.l   1 

	.text
begin_acc:		* first code executed is here
	move.l	#initstack,sp
	jsr _main	* jump to main() of desk accessory
	clr.w	(sp)	
	trap	#1	* Pterm0. I don't think you actually get this far. 
	.end

	************************************
	* Bindings for gemdos, bios, xbios *
	* These may be moved into dlibs in *
	* a later version                  *
	************************************

         .globl _gemdos 
   _gemdos: 
         move.l    (sp)+,saveret 
         trap      #1 
         move.l    saveret,-(sp) 
         rts 

         .globl _bios 
   _bios: 
         move.l    (sp)+,saveret 
         trap      #13 
         move.l    saveret,-(sp) 
         rts 

         .globl _xbios 
   _xbios: 
         move.l    (sp)+,saveret 
         trap      #14 
         move.l    saveret,-(sp) 
         rts 

  
	*********************************************
	* crystal() function not in dlibs 2.0       *
        * but needed for Don Farmer's GEMQ bindings * 
	* You don't need this for Ian's GEMFAST     *
	*********************************************
	.globl _crystal
 _crystal:
	move.l	4(a7), d1
	move.w	#200,d0
	trap	#2
	rts


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