linux-kernel - Re: [PATCH] SAMPLES: kprobe_example: Make it print something on ARM.

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Message-ID: <54D2C2CA.7070705@huawei.com>
Date:	Thu, 5 Feb 2015 09:09:30 +0800
From:	"long.wanglong" <long.wanglong@...wei.com>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
CC:	<peifeiyue@...wei.com>, <linux-kernel@...r.kernel.org>,
	<anil.s.keshavamurthy@...el.com>, <davem@...emloft.net>,
	<linux-arm-kernel@...ts.infradead.org>, <ananth@...ibm.com>
Subject: Re: [PATCH] SAMPLES: kprobe_example: Make it print something on ARM.

On 2015/2/4 11:17, Masami Hiramatsu wrote:
> (2015/02/04 11:56), Wang Long wrote:
>> This KProbes example is a little useless if it doesn't print anything.
>> For ARM print similar messages to those produced on x86 and PPC.
> 
> BTW, I guess similar update required for s390, doesn't it?
> 

yes, because i am not familiar with s390, someone else may update this example for s390.

Best Regards
Wang Long

>>
>> Signed-off-by: Wang Long <long.wanglong@...wei.com>
> 
> Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> 
> Thank you!
> 
>> ---
>>  samples/kprobes/kprobe_example.c | 9 +++++++++
>>  1 file changed, 9 insertions(+)
>>
>> diff --git a/samples/kprobes/kprobe_example.c b/samples/kprobes/kprobe_example.c
>> index 366db1a..eba9f1a 100644
>> --- a/samples/kprobes/kprobe_example.c
>> +++ b/samples/kprobes/kprobe_example.c
>> @@ -42,6 +42,11 @@ static int handler_pre(struct kprobe *p, struct pt_regs *regs)
>>  			" ex1 = 0x%lx\n",
>>  		p->addr, regs->pc, regs->ex1);
>>  #endif
>> +#ifdef CONFIG_ARM
>> +	printk(KERN_INFO "pre_handler: p->addr = 0x%p, ARM_pc = 0x%lx,"
>> +			" ARM_cpsr = 0x%lx\n",
>> +		p->addr, regs->ARM_pc, regs->ARM_cpsr);
>> +#endif
>>  
>>  	/* A dump_stack() here will give a stack backtrace */
>>  	return 0;
>> @@ -67,6 +72,10 @@ static void handler_post(struct kprobe *p, struct pt_regs *regs,
>>  	printk(KERN_INFO "post_handler: p->addr = 0x%p, ex1 = 0x%lx\n",
>>  		p->addr, regs->ex1);
>>  #endif
>> +#ifdef CONFIG_ARM
>> +	printk(KERN_INFO "post_handler: p->addr = 0x%p, ARM_cpsr = 0x%lx\n",
>> +		p->addr, regs->ARM_cpsr);
>> +#endif
>>  }
>>  
>>  /*
>>
> 
> 


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