linux-kernel - Re: [PATCH v4] kprobes: arm: enable OPTPROBES for ARM 32

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Date:	Sat, 16 Aug 2014 00:23:39 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Wang Nan <wangnan0@...wei.com>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	"Jon Medhurst (Tixy)" <tixy@...aro.org>, ananth@...ibm.com,
	anil.s.keshavamurthy@...el.com, davem@...emloft.net,
	Will Deacon <will.deacon@....com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	peifeiyue@...wei.com, lizefan@...wei.com
Subject: Re: [PATCH v4] kprobes: arm: enable OPTPROBES for ARM 32

(2014/08/12 13:56), Wang Nan wrote:
> +/* Caller must ensure addr & 3 == 0 */
> +static int can_optimize(unsigned long paddr)
> +{
> +	return 1;
> +}

As we have talked on another thread, we'd better filter-out all stack-pushing
instructions here, since (as you said) that will corrupt pt_regs on the stack.

Thank you,

-- 
Masami HIRAMATSU
Software Platform Research Dept. Linux Technology Research Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com


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