linux-kernel - Re: [PATCH 2/2] [POWERPC] uprobes: powerpc port

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Date:	Wed, 06 Jun 2012 11:27:02 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	ananth@...ibm.com
Cc:	linuxppc-dev@...ts.ozlabs.org, lkml <linux-kernel@...r.kernel.org>,
	Paul Mackerras <paulus@...ba.org>, benh@...nel.crashing.org,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Anton Blanchard <anton@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	oleg@...hat.com
Subject: Re: [PATCH 2/2] [POWERPC] uprobes: powerpc port

On Wed, 2012-06-06 at 14:51 +0530, Ananth N Mavinakayanahalli wrote:
> One TODO in this port compared to x86 is the uprobe abort_xol() logic.
> x86 depends on the thread_struct.trap_nr (absent in powerpc) to determine
> if a signal was caused when the uprobed instruction was single-stepped/
> emulated, in which case, we reset the instruction pointer to the probed
> address and retry the probe again. 

Another curious difference is that x86 uses an instruction decoder and
contains massive tables to validate we can probe a particular
instruction.

Can we probe all possible PPC instructions?
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