14 Feb
2018
14 Feb
'18
1:08 a.m.
I don't suppose anybody has written a pdp-11 assembler to C translator...
My google fu is insufficient for the day.
Warner
14 Feb
14 Feb
3:18 a.m.
On Tue, 13 Feb 2018, Warner Losh wrote:
I don't suppose anybody has written a pdp-11
assembler to C
translator... My google fu is insufficient for the day.
I'd like to see it handle "JSR PC,@(SP)+"... Are you reverse-engineering
something, writing a PDP-11 simulator, or what?
--
Dave Horsfall DTM (VK2KFU) "Those who don't understand security will
suffer."
5:12 a.m.
On Tue, Feb 13, 2018 at 8:18 PM, Dave Horsfall <dave(a)horsfall.org> wrote:
On Tue, 13 Feb 2018, Warner Losh wrote:
I don't suppose anybody has written a pdp-11 assembler to C translator...
I was wondering what it would take to convert the v6/v7 basic program into
something that can be run today.
http://www.tuhs.org/cgi-bin/utree.pl?file=V6/usr/source/s1/bas.s
or
http://www.tuhs.org/cgi-bin/utree.pl?file=V7/usr/src/cmd/bas/bas.s
Its 2128 lines. It doesn't have that fun instruction in it :)
Warner
My google fu is insufficient for the day.
I'd like to see it handle "JSR PC,@(SP)+"... Are you reverse-engineering
something, writing a PDP-11 simulator, or what?
6:43 a.m.
On Tue, 13 Feb 2018, Warner Losh wrote:
I was wondering what it would take to convert the
v6/v7 basic program
into something that can be run today.
Hmmm... If it were C-generated then it would be (somewhat) easy, but it's
hand-written and hand-optimised... You'd have to do some functional
analysis on it e.g. what does this routine do, etc.
Its 2128 lines. It doesn't have that fun
instruction in it :)
I know! Say ~2,000 lines, say ~100 people on this list, distributed
computing to the rescue! That's only 20 lines each, so it ought to be a
piece of cake :-)
--
Dave Horsfall DTM (VK2KFU) "Those who don't understand security will
suffer."
7:27 a.m.
On Tue, 13 Feb 2018 22:12:50 -0700 Warner Losh <imp(a)bsdimp.com> wrote:
On Tue, Feb 13, 2018 at 8:18 PM, Dave Horsfall <dave(a)horsfall.org> wrote:
May be it just needs a perl script to generate C code?
Example:
2: label(lab0);
cmp r0,(r3) cmp(r0,deref(r3));
beq 2f beq(lab1);
tst (r3) => tst(deref(r3));
beq 2f beq(lab1);
add $6,r3 add(6,r3);
br 2b br(lab0);
2: label(lab1);
C calls are to macros or inline functions.
On Tue, 13 Feb 2018, Warner Losh wrote:
I don't suppose anybody has written a pdp-11 assembler to C translator...
I was wondering what it would take to convert the v6/v7 basic program into
something that can be run today.
http://www.tuhs.org/cgi-bin/utree.pl?file=V6/usr/source/s1/bas.s
or
http://www.tuhs.org/cgi-bin/utree.pl?file=V7/usr/src/cmd/bas/bas.s
Its 2128 lines. It doesn't have that fun instruction in it :) My google fu is insufficient for the day.
I'd like to see it handle "JSR PC,@(SP)+"... Are you reverse-engineering
something, writing a PDP-11 simulator, or what? 
7:28 a.m.
On 2018-02-14 14:18, Dave Horsfall wrote:
I'd like to see it handle "JSR
PC,@(SP)+"...
BTW, isn't that precisely the "retpoline" that we've seen in the news
recently ?
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4:03 p.m.
On 2/13/18, Warner Losh <imp(a)bsdimp.com> wrote:
I don't suppose anybody has written a pdp-11
assembler to C translator...
My google fu is insufficient for the day.
Or you could write a compiler that translates PDP-11 assembler to LLVM
intermediate language. That was the technique used to port VMS to the
DEC Alpha and Intel Itanium. A lot of VMS was in VAX assembler, so
DEC's compiler group wrote a compiler that took in VAX assembler and
generated IL for the GEM back end used by all of DEC's Alpha and
Itanium compilers.
-Paul W.
4:56 p.m.
On Wed, Feb 14, 2018 at 9:03 AM, Paul Winalski <paul.winalski(a)gmail.com>
wrote:
On 2/13/18, Warner Losh <imp(a)bsdimp.com> wrote:
Yea, I was kinda hoping someone else had already done the translation for
basic. But it actually looks to be from v5, using the v5 calling
conventions and library routines now that I have had a chance to study it.
Warner
I don't suppose anybody has written a pdp-11
assembler to C translator...
My google fu is insufficient for the day.
Or you could write a compiler that translates PDP-11 assembler to LLVM
intermediate language. That was the technique used to port VMS to the
DEC Alpha and Intel Itanium. A lot of VMS was in VAX assembler, so
DEC's compiler group wrote a compiler that took in VAX assembler and
generated IL for the GEM back end used by all of DEC's Alpha and
Itanium compilers.
2266
days inactive
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7 comments
5 participants
participants (5)
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Bakul Shah -
Dave Horsfall -
Ian Zimmerman -
Paul Winalski -
Warner Losh