linux-kernel - Re: [PATCH v13 10/10] kprobes: Add arm64 case in kprobe example module

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Date:	Wed, 8 Jun 2016 13:49:05 +0800
From:	Huang Shijie <shijie.huang@....com>
To:	David Long <dave.long@...aro.org>
CC:	Catalin Marinas <catalin.marinas@....com>,
	James Morse <james.morse@....com>,
	Marc Zyngier <marc.zyngier@....com>,
	Pratyush Anand <panand@...hat.com>,
	Sandeepa Prabhu <sandeepa.s.prabhu@...il.com>,
	"Will Deacon" <will.deacon@....com>,
	William Cohen <wcohen@...hat.com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>,
	"Steve Capper" <steve.capper@...aro.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	"Li Bin" <huawei.libin@...wei.com>,
	Adam Buchbinder <adam.buchbinder@...il.com>,
	Alex Bennée <alex.bennee@...aro.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	"Ard Biesheuvel" <ard.biesheuvel@...aro.org>,
	Christoffer Dall <christoffer.dall@...aro.org>,
	Daniel Thompson <daniel.thompson@...aro.org>,
	Dave P Martin <Dave.Martin@....com>,
	Jens Wiklander <jens.wiklander@...aro.org>,
	Jisheng Zhang <jszhang@...vell.com>,
	"John Blackwood" <john.blackwood@...r.com>,
	Mark Rutland <mark.rutland@....com>,
	Petr Mladek <pmladek@...e.com>,
	Robin Murphy <robin.murphy@....com>,
	"Suzuki K Poulose" <suzuki.poulose@....com>,
	Vladimir Murzin <Vladimir.Murzin@....com>,
	Yang Shi <yang.shi@...aro.org>,
	Zi Shen Lim <zlim.lnx@...il.com>,
	yalin wang <yalin.wang2010@...il.com>,
	Mark Brown <broonie@...nel.org>, <nd@....com>
Subject: Re: [PATCH v13 10/10] kprobes: Add arm64 case in kprobe example
 module

On Thu, Jun 02, 2016 at 11:26:24PM -0400, David Long wrote:
> From: Sandeepa Prabhu <sandeepa.s.prabhu@...il.com>
> 
> Add info prints in sample kprobe handlers for ARM64
> 
> Signed-off-by: Sandeepa Prabhu <sandeepa.s.prabhu@...il.com>
> ---
>  samples/kprobes/kprobe_example.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/samples/kprobes/kprobe_example.c b/samples/kprobes/kprobe_example.c
> index ed0ca0c..aad8e6f 100644
> --- a/samples/kprobes/kprobe_example.c
> +++ b/samples/kprobes/kprobe_example.c
> @@ -46,6 +46,10 @@ static int handler_pre(struct kprobe *p, struct pt_regs *regs)
>  			" ex1 = 0x%lx\n",
>  		p->symbol_name, p->addr, regs->pc, regs->ex1);
>  #endif
> +#ifdef CONFIG_ARM64
> +	pr_info("pre_handler: p->addr = 0x%p, pc = 0x%lx\n",
> +		p->addr, (long)regs->pc);
Please add the "p->symbol_name" for the log, just as the above line.

> +#endif
>  
>  	/* A dump_stack() here will give a stack backtrace */
>  	return 0;
> @@ -71,6 +75,10 @@ static void handler_post(struct kprobe *p, struct pt_regs *regs,
>  	printk(KERN_INFO "<%s> post_handler: p->addr = 0x%p, ex1 = 0x%lx\n",
>  		p->symbol_name, p->addr, regs->ex1);
>  #endif
> +#ifdef CONFIG_ARM64
> +	pr_info("post_handler: p->addr = 0x%p, pc = 0x%lx\n",
> +		p->addr, (long)regs->pc);
> +#endif
>  }
Ditto.

thanks
Huang Shijie