From: Ullrich von Bassewitz (uz_at_musoftware.de)
Date: 2003-08-18 11:15:12
Hi!
On Mon, Aug 18, 2003 at 04:08:24AM -0400, Greg King wrote:
> I was thinking of the programmer who might want to steal a region from the
> high end of "normal" RAM. He would need to move the stack out of his way.
> (But, he wouldn't need to move the start of his program.) Without %E, he
> would need to write a special script; with %E, he would need only to add an
> option to the command-line that builds the program.
>
> I see %E as a natural compliment of %S. (If a command-line can move the
> bottom easily, then it should be able to move the top easily, too.)
%S is more or less a relict from the old cc65, where the start address could
be specified. None of the existing targets does use it besides "none", which
is not a real target, and "lunix" where use of %S is not really necessary. So
the argument that we need %E because %S is already there is questionable.
I don't think that we need to protect a cc65 user against using a customized
linker script by any means. Instead of using %S, the standard linker script
could be used and the start address of the segment changed. This is not much
more work than just adding -S to the command line.
> I don't see it as a _special_ solution.
I think it is special. Here is how a more general solution would work (and
this is what I will add when adding expressions to the linker scripts): Allow
to pass arbitrary values from the linker command line into the linker script
by using something like
--define endaddr=0x2000
The variable could later be accessed as %endaddr in the linker script.
Anyway, I would suggest that we try to leave things as they are now. At some
point in the future, I will add expression evaluation for the linker, which
will solve lots of problems at once without a need for any special solutions.
To solve the heap issue, I will think about moving the heap variable
initialization into the machine specific directories. This would allow
platforms with non contigous memory to use the heap.
Regards
Uz
--
Ullrich von Bassewitz uz_at_musoftware.de
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