[MiNT] Corruption of high TPA

[Vincent Rivière <vincent.riviere@freesbee.fr>]

Hello.

I have compiled some programs with the latest MiNTLib, everything works well 
on my usual ARAnyM + EasyMiNT setup.

Bur I tried them on another more complicated MiNT setup, with several 
resident programs, accessories, etc. and the new programs crashes in the 
startup code !

I managed to reproduce the crash with the very simple assembler program 
attached to this message. It is a stand-alone program, it does not use the 
MiNTLib but it mimics its behaviour. Basically, it initializes the stack at 
the top of the TPA, and displays a message.

On my problematic MiNT setup, it crashes even before displaying the message! 
But if I subtract 36 bytes from my new stack, it works. So it looks like the 
36 highest bytes of the TPA are getting corrupted by something.

Could you please confirm that this small program is correct without any 
subtract, so my MiNT setup is broken ?

--
Vincent Rivière

	move.l	4(sp),a0	| get basepage
	move.l	4(a0),d0	| get _base->p_hitpa
	and.l	#0xfffffffc,d0	| align on lower 4 bytes

|	sub.l	#0,d0		| Bus Error before Hello
|	sub.l	#28,d0		| Bus Error before Hello
|	sub.l	#32,d0		| Bus Error after Hello
|	sub.l	#36,d0		| No Bus Error
	
	move.l	d0,sp		| this is the new stack

	pea	msg
	move.w	#9,-(sp)	| Cconws()
	trap	#1
	addq.l	#6,sp
	
	clr.w	-(sp)		| Pterm0()
	trap	#1

msg:	.asciz	"Hello!\r\n"