Porting troubles

Maloney johnm at wdi.disney.com
Fri Jul 17 00:59:13 UTC 1998

>As a learning experience I have tried porting Squeak to Linux/m68k (Debian
>2.0beta). While the make process ran without a problem (thanks Ian!) I
>quickly faced a segmentation fault when running Squeak (in the
>incrementalGC when the lowSpaceWatcher is installed, to be precise).
>Inspecting the variables I found following:
>(gdb) print memory
>$22 = (unsigned char *) 0xc0151008 "À\026\030I\r\""
>(gdb) print endOfMemory
>$11 = -1068549284
>As I read it the memory has been malloced high up and all those ints that
>represent addresses have become negative, breaking the pointer arithmetic.
>So...shouldn´t all variables that hold addresses (OOPs) be declared as
>unsigned instead of int (or am I barking up the wrong tree) ?

Yes, or (void *) perhaps. But I'd hate to have to put all
those type declarations into the Smalltalk code that is used
to generate the C code for the VM...

It might be easier to figure out how to force allocation in the
lower half of the address space.

	-- John

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