linux-kernel - Re: [PATCH V2 8/9] tools/perf: Add support to find global register variables using find_data_type_global

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Date: Fri, 24 May 2024 12:47:31 +0000
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
CC: "acme@...nel.org" <acme@...nel.org>, "jolsa@...nel.org"
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Subject: Re: [PATCH V2 8/9] tools/perf: Add support to find global register
 variables using find_data_type_global_reg



Le 24/05/2024 à 14:17, Athira Rajeev a écrit :
> 
> 
>> On 7 May 2024, at 3:33 PM, Christophe Leroy <christophe.leroy@...roup.eu> wrote:
>>
>>
>>
>> Le 06/05/2024 à 14:19, Athira Rajeev a écrit :
>>> There are cases where define a global register variable and associate it
>>> with a specified register. Example, in powerpc, two registers are
>>> defined to represent variable:
>>> 1. r13: represents local_paca
>>> register struct paca_struct *local_paca asm("r13");
>>>
>>> 2. r1: represents stack_pointer
>>> register void *__stack_pointer asm("r1");
>>
>> What about r2:
>>
>> register struct task_struct *current asm ("r2");
> 
> Hi Christophe,
> 
> Referring to arch/powerpc/include/asm/current.h, “current” in powerpc 64 bit is from paca_struct which is handled with r13
> R2 definition which you shared above is for 32 bit case.
> 

Hi Athira,

Yes I know.

Your patches are meant to handle both powerpc/64 and powerpc/32, aren't 
they ?

Christophe