Subject: Page Fault in comstart()
To: None <current-users@NetBSD.ORG>
From: Robert Dobbs <email@example.com>
Date: 01/22/1995 23:58:21
On i386/DX20, Hayes ESP board in 16550 mode.
Page Fault Trap in _bcopy in _comstart in _slstart in _comintr
_bcopy(f867b240, f7bffc0c, 10, f866af02, f867b240)
So far as I can tell, this is happening inside q_to_b(), where for some
reason, too much is being copied or to a nasty address in bcopy().
On inspection, neither makes much sense: we're copying into a fixed 16
character array and it seems bounded such that we'll only copy 16 chars
even though the clist is 1024 (tty.c in ttymalloc()).
What I don't understand is why q_to_b has a while loop. It appears that
one of the two while conditions will be met after the first pass in every
16 4 everything copied, cc = 0; exit
16 32 buffer filled, count = 0; exit
16 16 everything copied AND buffer filled; exit
What am I missing here? Is there actually a reason this is a while loop?
I've seen other mail about a problem near here, that person too had a
hayes esp board. I'm willing to put in some diagnostic code, but I
need some examples of what I can do other than a panic(); can I call