From: jnc@mercury.lcs.mit.edu (Noel Chiappa)
Subject: [TUHS] alloc.s is missing from unix v5
Date: Thu, 7 Aug 2014 08:30:12 -0400 (EDT) [thread overview]
Message-ID: <20140807123012.9CE2B18C0DE@mercury.lcs.mit.edu> (raw)
> From: Mark Longridge <cubexyz at gmail.com>
> In Unix v6 there is a file in the TUHS archives
> V6/usr/source/s4/alloc.s
> ..
> In v5 the command "ar t /lib/libc.a" lists the files in the c library
> and that includes alloc.o
Well, at least you have the binary. Dis-assembly time! :-)
> so there should be a source file somewhere.
Ha-ha-ha-ha-HAH! You _are_ an optimist!
I'm not joking about the dis-assembly. Not to worry, it's not too bad (I had
to do it to retrieve the source for the V6 RL bootstraps - and you've got
symbols too), and you've got the V6 alloc.s to guide you - with luck, it did
not get re-written between V5 and V6, and you may have minimal (no?) changes
to deal with?
I don't know which debugger V5 has (db or cdb); if neither, you can spin up a
V6 and do the disassembly there.
Do "db alloc.o > alloc.s" and then type '0?<RETURN>' followed by a whole
bunch of RETURNs. (You can do plain 'db alloc.o' first, to see about how many
CR's you need.) Next do a "nm alloc.o" to get as many symbols as you can.
At that point, I would extract your prototype alloc.s from the emulated
machine so you can use a real editor to work on it. (You should have a way
to get files in and out of the simulated machine; that was one of the
first things I did with my V6 work:
http://www.chiappa.net/~jnc/tech/V6Unix.html
although if you're using SIMH I don't know if that has a way to import
files - a big advantage to using Ersatz-11, although one I didn't know
about when I picked it.)
You may need to go back and do a "xxx/" {with appropriate value for "xxx"}
plus a few CR's to get static constants, but at that point you should have
all the raw data you need to re-create the V5 alloc.s. Obviously, start
by having your proto-allocV5.s in one window, and compare with the
allocV6.s in another... like I said, you may luck out.
The final step, of course, is 'as alloc.s', and then 'cmp a.out alloc.o'.
Noel
next reply other threads:[~2014-08-07 12:30 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-07 12:30 Noel Chiappa [this message]
-- strict thread matches above, loose matches on Subject: below --
2014-08-07 5:05 Mark Longridge
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