Re: [MiNT] Program start up

["Roger Burrows" <rfburrows@ymail.com>]

Hi Lonny,
On 26 Apr 2009 at 4:25, Lonny Pursell wrote:
> 
> I spent some time looking through the cvs files as did Pep for some info
> regarding program startup.  I know 4(sp) points to the basepage, and a0
> points to a basepage if it's a desk accessory. Pep had some other info:
> 
> a6 holds a copy of the stack
> a5 points to the data segment
> a4 points to the bss
> 
> However, we could not find anything to verify these. Anyone know where to
> look in the CVS? Or a doc somewhere?  Or just don't rely on these?  :)
> 

AFAIK, the only things you can rely on when you receive control (i.e. at the 
first byte of the text segment) are:
1) if a0 is non-zero, you are being called as a DA.  a0 points to the program 
basepage; otherwise
2) you are being called as a program and 4(sp) points to the basepage.

You can get the address of the bss & data segments from the basepage.

Regards,
Roger