[TUHS] Memory management in Dennis Ritchie's C Compiler

[John Cowan]

On Mon, Aug 24, 2020 at 12:00 PM Dan Cross <crossd at gmail.com> wrote:


> Stacks may be at the top of the user portion of the address space; but I'd
> have to double check the details.
>

That's always true on the PDP-11 and Vax, no matter what the OS, because
the processor architecture (which has pre-increment and post-decrement
instructions, but not their counterparts) makes anything but a
downward-growing stack unmanageable.  In OSes without virtual memory like
RSX-11[ABC], RT-11, and mini-Unix/LSX-11, what counts as the top naturally
varies.

Dennis's compiler AFAIK was never extended to anything but the PDP-11, both
as host and target.
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