From: wkt@tuhs.org (Warren Toomey)
Subject: [Unix-jun72] C compiler status
Date: Mon, 5 May 2008 17:50:17 +1000 [thread overview]
Message-ID: <20080505075017.GA81081@minnie.tuhs.org> (raw)
In-Reply-To: <20080505071212.GA80277@minnie.tuhs.org>
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
next prev parent reply other threads:[~2008-05-05 7:50 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-05 6:08 Warren Toomey
2008-05-05 6:59 ` Tim Newsham
2008-05-05 7:12 ` Warren Toomey
2008-05-05 7:50 ` Warren Toomey [this message]
2008-05-05 8:02 ` [Unix-jun72] C compiler: it works! Warren Toomey
2008-05-05 8:38 ` Warren Toomey
2008-05-05 16:57 ` [Unix-jun72] C compiler status Tim Newsham
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