linux-kernel - Re: [PATCH RFC 6/6] kprobes: Add cases for arm and arm64 in sample module

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Date:	Wed, 6 Nov 2013 16:35:44 +0530
From:	Sandeepa Prabhu <sandeepa.prabhu@...aro.org>
To:	Will Deacon <will.deacon@....com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"patches@...aro.org" <patches@...aro.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"steve.capper@...aro.org" <steve.capper@...aro.org>,
	"nico@...aro.org" <nico@...aro.org>,
	"srikar@...ux.vnet.ibm.com" <srikar@...ux.vnet.ibm.com>,
	"rostedt@...dmis.org" <rostedt@...dmis.org>,
	"masami.hiramatsu.pt@...achi.com" <masami.hiramatsu.pt@...achi.com>,
	"dsaxena@...aro.org" <dsaxena@...aro.org>,
	"jiang.liu@...wei.com" <jiang.liu@...wei.com>,
	"Vijaya.Kumar@...iumnetworks.com" <Vijaya.Kumar@...iumnetworks.com>
Subject: Re: [PATCH RFC 6/6] kprobes: Add cases for arm and arm64 in sample module

On 25 October 2013 20:54, Will Deacon <will.deacon@....com> wrote:
> On Thu, Oct 17, 2013 at 12:17:51PM +0100, Sandeepa Prabhu wrote:
>> Add info prints in sample kprobe handlers for ARM and ARM64
>> architecture.
>>
>> Signed-off-by: Sandeepa Prabhu <sandeepa.prabhu@...aro.org>
>> ---
>>  samples/kprobes/kprobe_example.c | 16 ++++++++++++++++
>>  1 file changed, 16 insertions(+)
>>
>> diff --git a/samples/kprobes/kprobe_example.c b/samples/kprobes/kprobe_example.c
>> index 366db1a..0521246 100644
>> --- a/samples/kprobes/kprobe_example.c
>> +++ b/samples/kprobes/kprobe_example.c
>> @@ -42,6 +42,14 @@ 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, pc = 0x%lx\n",
>> +                     p->addr, regs->ARM_pc);
>> +#endif
>> +#ifdef CONFIG_ARM64
>> +     printk(KERN_INFO "pre_handler: p->addr = 0x%p, pc = 0x%lx\n",
>> +             p->addr, (long)regs->pc);
>> +#endif
>
> Huh? Why can't you combine these two together and either unconditionall cast
> to long, or use void * and %p?
pt_regs member names are different: regs->pc (arm64) vs. regs->ARM_pc
(arm32). It is still possible to use instruction_pointer(regs) for
both architectures, but this needs including asm/ptrace.h which I am
not sure good thing to do in samples/

Thanks,
Sandeepa
>
> Will
> --
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