Re: [PATCH v2] PowerPC: kernel: compiling issue, make additionalroom in exception vector area

From: Chen Gang
Date: Thu Apr 25 2013 - 23:26:12 EST

On 2013å04æ26æ 11:08, Mike Qiu wrote:
> ä 2013/4/26 10:06, Chen Gang åé:
>> On 2013å04æ26æ 10:03, Mike Qiu wrote:
>>> ïï 2013/4/26 9:36, Chen Gang Ðïï:
>>>>> On 2013ïï04ïï26ïï 09:18, Chen Gang wrote:
>>>>>>> On 2013ïï04ïï26ïï 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:
>>>>>>>>> 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

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.


Chen Gang

Asianux Corporation
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at