From: Ralf Baechle <ralf@linux-mips.org>
To: "Kevin D. Kissell" <kevink@mips.com>
Cc: Franck Bui-Huu <vagabon.xyz@gmail.com>,
Andrew Haley <aph-gcc@littlepinkcloud.com>,
David Daney <ddaney@avtrex.com>,
linux-mips@linux-mips.org,
Richard Sandiford <rsandifo@nildram.co.uk>,
gcc@gcc.gnu.org
Subject: Re: Cannot unwind through MIPS signal frames with ICACHE_REFILLS_WORKAROUND_WAR
Date: Tue, 13 Nov 2007 15:08:20 +0000 [thread overview]
Message-ID: <20071113150820.GB6582@linux-mips.org> (raw)
In-Reply-To: <019e01c82602$f5463bf0$10eca8c0@grendel>
On Tue, Nov 13, 2007 at 03:37:39PM +0100, Kevin D. Kissell wrote:
> True, though it should perhaps be noted that currently it's only on 4KSc/Sd
> systems (which I know you work on) where it's even possible for the stack
> *not* to have exec permissions, since the classical MIPS MMU gives
> execute permission to any page that is readable.
Disabling PROT_EXEC on a mapping tells the kernel it doesn't need to take
care of I-cache coherency. So it's somewhat beneficial even in absence of
a protection bit in the actual TLB hardware.
Some of these performance optimizations are impossible because the kernel
can't have definate knowledge that certain addresses have never entered the
I-cache.
Ralf
next prev parent reply other threads:[~2007-11-13 15:11 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-13 7:52 Cannot unwind through MIPS signal frames with ICACHE_REFILLS_WORKAROUND_WAR David Daney
2007-11-13 11:48 ` Andrew Haley
2007-11-13 12:10 ` Ralf Baechle
2007-11-13 13:14 ` Franck Bui-Huu
2007-11-13 14:00 ` Ralf Baechle
2007-11-13 14:22 ` Franck Bui-Huu
2007-11-13 15:01 ` Ralf Baechle
2007-11-13 22:11 ` Andrew Pinski
2007-11-13 14:37 ` Kevin D. Kissell
2007-11-13 14:37 ` Kevin D. Kissell
2007-11-13 14:49 ` Franck Bui-Huu
2007-11-13 15:08 ` Ralf Baechle [this message]
2007-11-13 22:49 ` Cannot unwind through MIPS signal frames withICACHE_REFILLS_WORKAROUND_WAR Kevin D. Kissell
2007-11-13 22:49 ` Kevin D. Kissell
2007-11-13 21:26 ` VDSO on mips (was Re: Cannot unwind through MIPS signal frames with ICACHE_REFILLS_WORKAROUND_WAR) Franck Bui-Huu
2007-11-15 8:46 ` Cannot unwind through MIPS signal frames with ICACHE_REFILLS_WORKAROUND_WAR Franck Bui-Huu
2007-11-15 11:53 ` Ralf Baechle
2007-11-15 17:21 ` David Daney
2007-11-17 8:38 ` Franck Bui-Huu
2007-11-13 16:12 ` David Daney
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