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

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Date:	Sun, 26 Jun 2016 22:54:51 -0400
From:	David Long <dave.long@...aro.org>
To:	Huang Shijie <shijie.huang@....com>
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 06/08/2016 01:49 AM, Huang Shijie wrote:
> 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.
>

The v14 patch set will have changes that align more closely to how this 
works on other architectures.

>> +#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
>

Thanks,
-dl