linux-kernel - Re: [PATCH v2] PowerPC: kernel: compiling issue, make additional room in exception vector area

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Date:	Fri, 26 Apr 2013 11:54:54 +0800
From:	Mike Qiu <qiudayu@...ux.vnet.ibm.com>
To:	Chen Gang <gang.chen@...anux.com>
CC:	Michael Neuling <mikey@...ling.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <michael@...erman.id.au>,
	linuxppc-dev@...ts.ozlabs.org, sfr@...b.auug.org.au,
	matt@...abs.org, linux-kernel@...r.kernel.org,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: Re: [PATCH v2] PowerPC: kernel: compiling issue, make additional
 room in exception vector area

于 2013/4/26 11:42, Chen Gang 写道:
> On 2013年04月26日 11:25, Chen Gang wrote:
>> On 2013年04月26日 11:08, Mike Qiu wrote:
>>> 于 2013/4/26 10:06, Chen Gang 写道:
>>>> On 2013年04月26日 10:03, Mike Qiu wrote:
>>>>> �� 2013/4/26 9:36, Chen Gang д��:
>>>>>>> On 2013��04��26�� 09:18, Chen Gang wrote:
>>>>>>>>> On 2013��04��26�� 09:06, Chen Gang wrote:
>>>>>>>>>>>>> CFAR is the Come From Register.  It saves the location of the
>>>>>>>>>>>>> last
>>>>>>>>>>>>>>> branch and is hence overwritten by any branch.
>>>>>>>>>>>>>>>
>>>>>>>>>>> Do we process it just like others done (e.g. 0x300, 0xe00,
>>>>>>>>>>> 0xe20 ...) ?
>>>>>>>>>>>      . = 0x900
>>>>>>>>>>>      .globl decrementer_pSeries
>>>>>>>>>>> decrementer_pSeries:
>>>>>>>>>>>        HMT_MEDIUM_PPR_DISCARD
>>>>>>>>>>>      SET_SCRATCH0(r13)
>>>>>>>>>>>      b decrementer_pSeries_0
>>>>>>>>>>>
>>>>>>>>>>>      ...
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>> Oh, it seems EXCEPTION_PROLOG_1 will save the regesters which related
>>>>>>> with CFAR, so I think need move EXCEPTION_PROLOG_1 to near 0x900.
>>>>> I will try your diff V2, to see if the machine can boot up
>>>> OK, thanks. (hope it can work)
>>> It seems that the machine can be bootup in powernv mode, but I'm not
>>> sure if my machine call that module.
>>>
>>> At lease my machine can boot up
> Please reference commit number: 1707dd161349e6c54170c88d94fed012e3d224e3
> (1707dd1 powerpc: Save CFAR before branching in interrupt entry paths)
>
> What our diff v2 has done is just the fix for our patch v2 (just like
> the commit 1707dd1 has done).
>
> Please check, thanks.
>
> :-)
I will check this evening or tomorrow, I have something else to do this 
afteroon.
>> Thank you for your information !
>>
>> I have checked the disassemble by powerpc64-linux-gnu-objdump, it seems
>> all we have done for 0x900 is almost like the original done for 0x200.
>>
>> I am just learning about the CFAR (google it), And I plan to wait for a
>> day, if all things go smoothly, I will send patch v3.
>>
>>
>> :-)
>>
>

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