benh at kernel.crashing.org
Fri Apr 17 17:33:08 EST 2009
On Thu, 2009-04-16 at 13:21 -0500, Kumar Gala wrote:
> The following patch is causing me issues w/init SEGV on boot. This is
> a pretty old version of init and I'm wondering what the commit you had
> related to old ABI breakage:
Can you test if the binary is trying to execute something that is
in a program section that isn't marked executable ? It could be
that it's build with a very old and broken toolchains.
(Note that when we finally add proper per-page exec permission support,
this will -also- break there even if we avoid that test below).
Maybe we can make a .config option for supporting obsolete crap that
tries to execute out of non executable sections ?
> commit 8d30c14cab30d405a05f2aaceda1e9ad57800f36
> Author: Benjamin Herrenschmidt <benh at kernel.crashing.org>
> Date: Tue Feb 10 16:02:37 2009 +0000
> powerpc/mm: Rework I$/D$ coherency (v3)
> This patch reworks the way we do I and D cache coherency on
> * Allow execution from readable areas if the MMU
> does not
> * provide separate controls over reading and
> + *
> + * Note: That code used to not be enabled for 4xx/BookE.
> + * It is now as I/D cache coherency for these is done at
> + * set_pte_at() time and I see no reason why the test
> + * below wouldn't be valid on those processors. This -
> + * break programs compiled with a really old ABI though.
> - k
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