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 09:06:10 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Michael Neuling <mikey@...ling.org>
CC:	Mike Qiu <qiudayu@...ux.vnet.ibm.com>,
	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

On 2013年04月26日 07:16, Michael Neuling wrote:
>> > diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
>> > index e789ee7..8997de2 100644
>> > --- a/arch/powerpc/kernel/exceptions-64s.S
>> > +++ b/arch/powerpc/kernel/exceptions-64s.S
>> > @@ -254,7 +254,11 @@ hardware_interrupt_hv:
>> >  	STD_EXCEPTION_PSERIES(0x800, 0x800, fp_unavailable)
>> >  	KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x800)
>> >  
>> > -	MASKABLE_EXCEPTION_PSERIES(0x900, 0x900, decrementer)
>> > +	. = 0x900
>> > +	.globl decrementer_pSeries
>> > +decrementer_pSeries:
>> > +	b	decrementer_pSeries_0
>> > +
> Unfortunately you can't do this ether as we need to save the CFAR[1]
> before it's overwritten by any branch. MASKABLE_EXCEPTION_PSERIES does
> this.
> 

Thanks for your checking.

> 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

	...


> Thanks for trying.
> 

Not at all, before get fixed by other members, I should continue trying.

-- 
Chen Gang

Asianux Corporation
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