From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: "tiejun.chen" <tiejun.chen@windriver.com>
Cc: linuxppc-dev@lists.ozlabs.org
Subject: Re: [v3][PATCH 2/3] ppc/kprobe: complete kprobe and migrate exception frame
Date: Wed, 12 Sep 2012 20:38:16 +1000 [thread overview]
Message-ID: <1347446296.2276.0.camel@pasglop> (raw)
In-Reply-To: <50504DEE.6060903@windriver.com>
On Wed, 2012-09-12 at 16:55 +0800, tiejun.chen wrote:
> > to worry about nor stack frame to create etc...
>
> If you don't like this v4, let me know and then I can go back memcpy
> for next
> version.
Just open code the whole copy. It should be easy really. As I said, you
have the src and dst already in registers and you know they are aligned,
so just put the size of the frame in a register (divided by 4), do an
mtctr and do a little load_update/store_update loop to do the copy, all
in the asm.
Ben.
next prev parent reply other threads:[~2012-09-12 10:38 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-11 2:20 [v3][PATCH 1/3] powerpc/kprobe: introduce a new thread flag Tiejun Chen
2012-09-11 2:20 ` [v3][PATCH 2/3] ppc/kprobe: complete kprobe and migrate exception frame Tiejun Chen
2012-09-11 5:51 ` Benjamin Herrenschmidt
2012-09-12 8:38 ` tiejun.chen
2012-09-12 8:43 ` Benjamin Herrenschmidt
2012-09-12 8:55 ` tiejun.chen
2012-09-12 10:38 ` Benjamin Herrenschmidt [this message]
2012-09-13 10:36 ` tiejun.chen
2012-09-13 21:42 ` Benjamin Herrenschmidt
2012-09-11 2:20 ` [v3][PATCH 3/3] ppc/kprobe: don't emulate store when kprobe stwu r1 Tiejun Chen
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