24 Aug
2020
24 Aug
'20
7:08 p.m.
On Mon, Aug 24, 2020 at 12:00 PM Dan Cross <crossd(a)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.