5 May
2008
5 May
'08
1:50 p.m.
On Mon, May 05, 2008 at 05:12:12PM +1000, Warren Toomey wrote:
It looks like we are not starting /usr/lib/c0
properly: the CPU never gets
to execute at 040000, and we end up in sysbreak without ever calling it.
Um, just an observation: u0.s defines:
core = orig+40000 / specifies beginning of user's core
ecore = core+20000 / specifies end of user's core (4096 words)
so a user program has 020000 bytes of space; but size /usr/lib/c0 gives:
023326+03574+06640=035762, and 035762 >> 020000.
Is the value of ecore arbitrary? What's above ecore, the kernel stack?
Mind you, if we set ecore== 040000+035762, thats 075762 which doesn't
leave much room, assuming that memory on the PDP-11/20 ends at 100000.
Warren