linux-kernel - Re: [PATCH v5 4/6] arm64: kprobes instruction simulation support

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Date:	Fri, 06 Mar 2015 09:42:59 -0500
From:	David Long <dave.long@...aro.org>
To:	Steve Capper <steve.capper@...aro.org>
CC:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Russell King <linux@....linux.org.uk>,
	Sandeepa Prabhu <sandeepa.prabhu@...aro.org>,
	William Cohen <wcohen@...hat.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	"Jon Medhurst (Tixy)" <tixy@...aro.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
	David Miller <davem@...emloft.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 4/6] arm64: kprobes instruction simulation support

On 03/06/15 06:39, Steve Capper wrote:
> On 17 February 2015 at 23:11, David Long <dave.long@...aro.org> wrote:
>> From: Sandeepa Prabhu <sandeepa.prabhu@...aro.org>
>>
>> Kprobes needs simulation of instructions that cannot be stepped
>> from different memory location, e.g.: those instructions
>> that uses PC-relative addressing. In simulation, the behaviour
>> of the instruction is implemented using a copy of pt_regs.
>>
>> Following instruction catagories are simulated:
>>   - All branching instructions(conditional, register, and immediate)
>>   - Literal access instructions(load-literal, adr/adrp)
>>
>> Conditional execution is limited to branching instructions in
>> ARM v8. If conditions at PSTATE do not match the condition fields
>> of opcode, the instruction is effectively NOP. Kprobes considers
>> this case as 'miss'.
>>
>> Thanks to Will Cohen for assorted suggested changes.
>>
>> Signed-off-by: Sandeepa Prabhu <sandeepa.prabhu@...aro.org>
>> Signed-off-by: William Cohen <wcohen@...hat.com>
>> Signed-off-by: David A. Long <dave.long@...aro.org>
>> ---
>
> Hi,
> Apologies for looking at these late (I was on holiday).
>
> I've applied this series on top of 3.19, but I get the following compile error:
> arch/arm64/kernel/kprobes-arm64.c:23:34: fatal error:
> probes-simulate-insn.h: No such file or directory
>   #include "probes-simulate-insn.h"
>                                    ^
> compilation terminated.
> scripts/Makefile.build:257: recipe for target
> 'arch/arm64/kernel/kprobes-arm64.o' failed
>
> Is something missing from this patch?
>
> Cheers,
> --
> Steve
>

Yes Steve, the patch is missing three new files.  It passed my testing 
because I had not cleaned out non-checked-in files from my cloned repo. 
  I've put a preliminary version of a v6 patch that addresses other 
feedback in my own public repo, and will send out a new patch in the 
near future after more testing and additional tweaks.

-dl

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