linux-kernel - Re: [PATCH v3 1/5] arm64: Kprobes with single stepping support

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Message-ID: <CA+b37P1UGDvVsCr_Y5p+N3MZF6fb-w09hb2woHmuy2ZDO84aWg@mail.gmail.com>
Date:	Thu, 20 Nov 2014 10:40:08 +0530
From:	Sandeepa Prabhu <sandeepa.prabhu@...aro.org>
To:	David Long <dave.long@...aro.org>
Cc:	Will Deacon <will.deacon@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Russell King <linux@....linux.org.uk>,
	William Cohen <wcohen@...hat.com>,
	Catalin Marinas <Catalin.Marinas@....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>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/5] arm64: Kprobes with single stepping support

On 19 November 2014 20:25, David Long <dave.long@...aro.org> wrote:
>> I was thinking of the magic hex numbers in the kprobes decode tables,
>> which
>> seem to correspond directly to the instruction classes described in insn.c
>>
>> Keeping the actual emulation code separate makes sense.
>>
>> Will
>
>
> Of course that follows the model of the much more complex arm32
> kprobes/uprobes decoding.  I can have a go at replacing it with insn.c
> calls.
well, the magic hex numbers were derived directly from ARMv8 ARM
Tabled C4.1 thru C4.6 and bit-masking would be faster search, but
surely you can give a try with insn.c (this would consume lot of
function calls to arrive at same decision).
~Sandeepa
>
> -dl
>
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