[Simh] VAX 780 & 3BSD

[Rico Pajarola]

Hi all

I just got 4.2BSD up and running thanks to Jason's detailed explanation! 
Many thanks.

Now I thought I'd try 3BSD... I started by replacing my 4.2BSD vmunix by 
the vmunix in 3BSD, and that's what I get:
VAX780 simulator V3.5-2

Boot
: ra(0,0)vmunix
61856+61008+70120 start 0x4b4

Segmentation fault (core dumped)

simh crashed... I had a quick look with gdb, but the stack is wedged...

Program received signal SIGSEGV, Segmentation fault.
0x00000000 in ?? ()
(gdb) bt
#0  0x00000000 in ?? ()
#1  0x00000000 in ?? ()
#2  0x00000000 in ?? ()
#3  0x00000002 in ?? ()
#4  0x00000000 in ?? ()
#5  0x0000001c in ?? ()
#6  0x08097580 in xub ()
...
#11 0x00000000 in ?? ()
#12 0x08095320 in ts_reg ()
#13 0x00005354 in ?? ()
...
#174 0x00000000 in ?? ()
#175 0x28094e72 in symlook_obj () from /libexec/ld-elf.so.1
#176 0x0807c98a in do_cmd (flag=1,
     fcptr=0x5 <Error reading address 0x5: Bad address>) at scp.c:784
#177 0x0807de66 in main (argc=2, argv=0xbfbfeba0) at scp.c:614
(gdb)

The stack trace looks rather useless to me... Any obvious ideas / 
starting points for debugging that?

regards
Rico