Problem with the stack on m68k

["Noah Aklilu" <naklilu at ualberta dot ca>]

Hi
	I writing code for a 68306 board using m68k cross compiler, 
and I was getting bus and address errors from my code, not always 
in the same location.  It seems to be related to problems with the 
stack, I have noticed that the compiler allocates portions of the
stack using "link" (e.g. link a6,#$FFEF) to create space for 
variables.  How does one control the maximum stack size?
Some of the errors seem to be related to corrupt files being
read back from the variable spaced allocated with "link".  I
have tested my memory to make sure it is fine.
Having written a few perl programs lately, my main function
ended up being a little large (about 200 lines).  As a result it seems 
to allocate a large chunk of (about 0xffff) of the stack as variable 
space. I have another
program that I tested and it is much smaller (about 20 lines)
and it runs to finish without any problems.

  
I want to check another thing. When calling assembly routines 
from c code, my routine assumes the first value it pops from the 
stack is the return address, and the next two values, its input 
parameters.  So I pop off the return address, save it in a0 (which I 
believe I can use as scratch space), and push it back onto the 
stack before returning using rts.





Noah Aklilu
MSc Graduate Student
Dept of Electrical and Computer Engineering

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