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From: bammi@cwruecmp.UUCP
Newsgroups: comp.sys.atari.st
Subject: Re: The mysteries of Pexec - Help
Message-ID: <1815@cwruecmp.UUCP>
Date: Thu, 8-Jan-87 13:48:55 EST
Article-I.D.: cwruecmp.1815
Posted: Thu Jan  8 13:48:55 1987
Date-Received: Fri, 9-Jan-87 06:52:50 EST
References: <724@looking.UUCP>
Reply-To: bammi@cwruecmp.UUCP (Jwahar R. Bammi)
Distribution: na
Organization: CWRU Dept. Comp. Eng., Cleveland OH
Lines: 46

In article <724@looking.UUCP> david@looking.UUCP (David Rowley) writes:
>
>There is one problem, though these various modes are mentioned in the
>Atari Docs, they are not fully documented.  The reader is referred to
>the 'Pexec Cookbook', which according to Atari Canada, does not exist.
>As of yet, I have not been able to get this method to work.
>
	If you are programming in Alcyon C, to get at the base page address
all you have to do is to declare an external (long)variable '_base'. In
gemstart.s the variable __base gets assigned the value of the baspage address.
If you are not using Alcyon C, you can still pick up the value in your
gemstart.s and pass it on to your program in a similar manner. 
In gemstart.s
	.globl	__base
	 ...........
	.text

	move.l	a7,a5		* First executed instruction
	move.l	4(a5),a5	* a5=basepage address
	move.l	a5,__base	* save pointer to basepage
	.data
__base .ds.l 	1


	I had this same problem with Pexec. I could
get Pexec to load  & not go (mode 3) using

	char *basepage, *file, *commandl;
	int status;

	basepage = Pexec(3, file, commandl, (long)NULL);

	But i could not get the just go (mode 4) function to work. It always
bombs out. I called it as follows

	status = Pexec(4, (long)NULL, (long)NULL, basepage);
				^^^^^^^^^^^^^^
				this is different from what the Hitch Hikers
				origonally said.
I asked the question here and did'nt get any response from Atari. Is
anyone listening ?? 
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