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

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Message-ID: <54D18F41.4070207@hitachi.com>
Date:	Wed, 04 Feb 2015 12:17:21 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Wang Long <long.wanglong@...wei.com>
Cc:	davem@...emloft.net, anil.s.keshavamurthy@...el.com,
	ananth@...ibm.com, linux-kernel@...r.kernel.org,
	peifeiyue@...wei.com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] SAMPLES: kprobe_example: Make it print something on
 ARM.

(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?

> 
> 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
>  }
>  
>  /*
> 


-- 
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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