linux-kernel - Re: [GIT] Sparc

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Message-ID: <20100922231219.GH19804@ZenIV.linux.org.uk>
Date:	Thu, 23 Sep 2010 00:12:19 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	David Miller <davem@...emloft.net>
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [GIT] Sparc

On Wed, Sep 22, 2010 at 02:15:14PM -0700, David Miller wrote:

> Alternatively, #2 could be implemented using a special ptrace getregs
> call created specifically to fetch the windowed registers.  And
> the regset implementation of that could be used for dumping them
> into core files as well, and this specifically I've been meaning to
> do at some point.
> 
> Again, let me think about this some more.

OK... sparc32 question: just what the !@#!@# happens if sun4c_rett_stackchk
find (%fp & 7) != 0?  We go to ret_trap_user_stack_is_bolixed, which
tries to page in the underlying page.  OK, suppose it's already there and
readable; we return without doing anything - and go to signal_p.  Which finds
itself with nothing to do, and %fp is *still* buggered.  Spin ad infinitum?
srmmu_rett_stackchk will do the same, BTW...
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