From: Ronald G Minnich <rminnich@lanl.gov>
To: <9fans@cse.psu.edu>
Subject: Re: [9fans] useful language extension, or no?
Date: Wed, 17 Jul 2002 16:28:04 -0600 [thread overview]
Message-ID: <Pine.LNX.4.33.0207171625010.7533-100000@snaresland.acl.lanl.gov> (raw)
In-Reply-To: <20020717222200.7C97C19ACF@mail.cse.psu.edu>
On Thu, 18 Jul 2002 arisawa@ar.aichi-u.ac.jp wrote:
> Is it unavoidable machine codes in stack are executable?
your architecture has to support r,w,x on segments. then the OS has to
actually make that work. Most OSes I've seen always set x on all segments,
including stack. It's not even possible to do things otherwise on many of
them.
Does plan9 have x-only and r-only and rw-only segments in the VM system? I
was pretty sure it did not.
I got into fruitless argument with an architecture guy about the value of
x bits in the VM system. His argument was that it was a bad idea for
performance. I doubt even in the x86 that it is solid and well-tested, but
who knows.
ron
next prev parent reply other threads:[~2002-07-17 22:28 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-16 14:12 Sam
2002-07-16 16:30 ` Boyd Roberts
2002-07-17 12:49 ` Ian Broster
2002-07-17 12:12 ` Sam
2002-07-17 13:33 ` Lucio De Re
2002-07-17 16:12 ` Fariborz (Skip) Tavakkolian
2002-07-17 22:21 ` arisawa
2002-07-17 22:28 ` Ronald G Minnich [this message]
2002-07-18 9:51 ` Douglas A. Gwyn
2002-07-18 10:19 ` Lucio De Re
2002-07-18 10:28 ` Lucio De Re
2002-07-18 14:50 ` Mike Haertel
2002-07-18 14:56 ` Lucio De Re
2002-07-19 5:23 ` arisawa
2002-07-18 14:21 ` Douglas A. Gwyn
2002-07-18 14:55 ` Lucio De Re
2002-07-16 15:53 rob pike, esq.
2002-07-16 15:05 ` Sam
2002-07-16 21:29 ` Steve Kilbane
2002-07-16 16:08 rob pike, esq.
2002-07-16 15:31 ` Sam
2002-07-16 16:50 rob pike, esq.
2002-07-16 15:59 ` Sam
2002-07-16 17:04 ` Howard Trickey
2002-07-16 16:20 ` Sam
2002-07-16 17:01 forsyth
2002-07-17 8:59 ` Douglas A. Gwyn
2002-07-16 17:31 presotto
2002-07-17 8:58 ` William Josephson
2002-07-17 8:58 ` Douglas A. Gwyn
2002-07-17 13:36 rob pike, esq.
2002-07-18 12:54 Richard Miller
2002-07-18 15:02 forsyth
2002-07-18 23:57 ` arisawa
2002-07-29 15:59 ` Douglas A. Gwyn
2002-07-18 19:24 David Gordon Hogan
2002-07-19 4:22 ` Lucio De Re
2002-07-19 0:52 David Gordon Hogan
2002-07-19 12:53 ` Digby Tarvin
2002-07-19 15:41 ` Mike Haertel
2002-07-19 18:09 ` Digby Tarvin
2002-07-19 18:38 ` Scott Schwartz
2002-07-19 19:07 ` Digby Tarvin
2002-07-29 16:01 ` Ralph Corderoy
2002-07-19 6:48 forsyth
2002-07-19 15:45 forsyth
2002-07-19 18:19 ` Digby Tarvin
2002-07-19 18:22 David Gordon Hogan
2002-07-19 18:36 ` Digby Tarvin
2002-07-19 18:33 David Gordon Hogan
2002-07-19 18:35 forsyth
2002-07-20 5:59 forsyth
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