PDP-11/45 RSTS/E boot problem

[Noel Chiappa]

    > From: Fritz Mueller

    > I've had a bit of time in front of the machine to repro this and take a
    > look. What I actually see is:

    > R0 177770
    > R1 0
    > R2 0
    > R3 0
    > R4 0
    > R5 34
    > R6 141774
    > PC 000254

Argh. (Very red face!)

I worked out the trap stack layout by looking at m40.s and trap.c, and
totally forgot about the return PC (that's the 0444) from the call to
trap():

  0001740 000013 141756 022050 000013 000000 000000 000000 000034
  0001760 000444 000031 177760 000000 030351 177770 010210 170010

I clearly should have looked at core(V) in the V6 manual!

The R6 you have recorded is correct for just after the trap; that's
the kernel mode SP, which points to the top of the kernel stack,
in segment 6 (in the swappable per-process kernel area, which runs
from 140000-1776).

So there is no R5 mystery, I was just confused. Back to the other two!

	Noel