Re: [TUHS] Unix V6: Assembler Listings

[Warner Losh <imp@bsdimp.com>]

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On Thu, Jun 11, 2020 at 9:27 AM Paul Ruizendaal <pnr@planet.nl> wrote:

>
> > I am now writing code in assembly for the PDP-11. I remember reading
> > somewhere that the output from "AS" (my caps) is a bit meagre. I can't
> find
> > an option to produce a text listing. Is it possible from AS, using
> command
> > options (I can't see one)  or perhaps from "LD"?
> >
> > Paul
> >
> > *Paul Riley*
>
> I had the same problem. As I was porting to a different mini I had to
> write a new assembler. As you have undoubtedly seen, early ‘as’ was written
> in assembler and not so easy to use as a base. Hence I used Richard’s
> Miller’s AS for the Interdata as a base (available on Tuhs):
> https://www.tuhs.org/cgi-bin/utree.pl?file=Interdata732/usr/source/as
>
> Later I discovered that the TUHS archive has source code for the original
> ‘as’ rewritten in C, a work by Roger Jaeger:
> https://minnie.tuhs.org/Archive/Distributions/USDL/Mini-Unix/
>
> Maybe adding a listing module to this version of ‘as’ is another possible
> route.


There's also
https://minnie.tuhs.org/cgi-bin/utree.pl?file=2.11BSD/src/new/m11/macxrf.c
which
looks to be decent or better K&R code from a quick look, but I don't know
if it works, or if it would be easy to adopt to AT&T/Bell syntax which
decorates things less, making it a little harder to infer semantic meanings.

Also more digging shows the UNSW tapes / sources also are from Harvard. All
roads lead to Harvard for this it seems :)

Warner

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