From: jnc@mercury.lcs.mit.edu (Noel Chiappa)
Subject: [TUHS] Harvard and Von Neumann Architectures and Unix
Date: Mon, 27 Nov 2017 12:11:22 -0500 (EST) [thread overview]
Message-ID: <20171127171122.89ECF18C092@mercury.lcs.mit.edu> (raw)
> From: Larry McVoy
>> they aren't really 'self-modifying code' - which I define as 'a program
>> which _changes_ _existing_ instructions
> Isn't that how dtrace works?
I'm not familiar with dtrace(), but if it modifies some other routine's code,
then it would not be "self" modifying, right?
Oh, another category, sort of like biological viruses (which are in a grey
zone between 'alive' and not): the PDP-11 paper tape bootstrap:
http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/bootloader.mac
in which the program's own code _is_ modified - but not by program
instructions, but by data on the paper tape it is reading in. It's
entertainingly convoluted (the copy above should be well-enough commented to
make it pretty easy to understand what's going on).
Noel
next reply other threads:[~2017-11-27 17:11 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-27 17:11 Noel Chiappa [this message]
2017-11-28 0:23 ` Dave Horsfall
-- strict thread matches above, loose matches on Subject: below --
2017-11-27 16:11 Noel Chiappa
2017-11-27 16:50 ` Larry McVoy
2017-11-27 17:08 ` Clem Cole
2017-11-27 18:21 ` Lawrence Stewart
2017-11-27 18:30 ` Lars Brinkhoff
2017-11-27 18:14 ` Warner Losh
2017-11-27 18:26 ` Paul Winalski
2017-11-27 17:35 ` Ian Zimmerman
2017-11-28 14:55 ` Tim Bradshaw
2017-11-28 19:45 ` Paul Winalski
2017-11-25 17:34 Doug McIlroy
2017-11-25 14:24 Noel Chiappa
2017-11-25 15:58 ` Lawrence Stewart
2017-11-25 16:10 ` Lars Brinkhoff
2017-11-25 19:59 ` Steve Simon
2017-11-25 21:59 ` Bakul Shah
2017-11-25 3:14 Doug McIlroy
2017-11-25 4:16 ` Jon Steinhart
2017-11-25 5:17 ` ron minnich
2017-11-25 14:23 ` Ralph Corderoy
2017-11-24 21:43 Noel Chiappa
2017-11-24 21:50 ` Jon Steinhart
2017-11-25 21:55 ` William Cheswick
2017-11-25 23:15 ` Dave Horsfall
2017-11-24 22:20 ` Mike Markowski
2017-11-24 22:31 ` Dave Horsfall
2017-11-24 19:25 Will Senn
2017-11-24 19:28 ` Jon Steinhart
2017-11-27 14:50 ` Tony Finch
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