linux-kernel - Re: [RFC 4/8] ARM64: Add instruction_pointer

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Date:	Fri, 09 Jan 2015 10:48:51 +0530
From:	Pratyush Anand <panand@...hat.com>
To:	Will Deacon <will.deacon@....com>
CC:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"tixy@...aro.org" <tixy@...aro.org>,
	"ananth@...ibm.com" <ananth@...ibm.com>,
	"sandeepa.prabhu@...aro.org" <sandeepa.prabhu@...aro.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"anil.s.keshavamurthy@...el.com" <anil.s.keshavamurthy@...el.com>,
	"masami.hiramatsu.pt@...achi.com" <masami.hiramatsu.pt@...achi.com>,
	"wcohen@...hat.com" <wcohen@...hat.com>,
	"oleg@...hat.com" <oleg@...hat.com>
Subject: Re: [RFC 4/8] ARM64: Add instruction_pointer_set function



On Thursday 08 January 2015 10:29 PM, Will Deacon wrote:
> On Wed, Dec 31, 2014 at 03:21:20PM +0000, Pratyush Anand wrote:
>> instruction_pointer_set is needed for uprobe implementation. Hence
>> define it for ARM64.
>>
>> Signed-off-by: Pratyush Anand <panand@...hat.com>
>> ---
>>   arch/arm64/include/asm/ptrace.h | 6 ++++++
>>   1 file changed, 6 insertions(+)
>>
>> diff --git a/arch/arm64/include/asm/ptrace.h b/arch/arm64/include/asm/ptrace.h
>> index 24cc048ac3e7..29d9bf5e3635 100644
>> --- a/arch/arm64/include/asm/ptrace.h
>> +++ b/arch/arm64/include/asm/ptrace.h
>> @@ -206,6 +206,12 @@ static inline int valid_user_regs(struct user_pt_regs *regs)
>>   #define instruction_pointer(regs)	((regs)->pc)
>>   #define stack_pointer(regs)		((regs)->sp)
>>
>> +static inline void instruction_pointer_set(struct pt_regs *regs,
>> +					   unsigned long val)
>> +{
>> +	instruction_pointer(regs) = val;
>> +}
>
> Do you think we could make use of the asm-generic ptrace header to get
> this for free? afaict, we just need to implement GET_USP and possibly
> GET_FP for the compat case (although it may well be that we still handle
> the compat case entirely separately).
>

Yes, We can use asm-generic for it.

I think , we can also add link_pointer and link_pointer_set in 
asm-generic/ptrace.h to help with all retprobes.

~Pratyush
> Will
> --
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