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

From: Chen Gang <[email-masked]>
Date: Thu, 25 Apr 2013 17:30:43 +0800

On 2013年04月25日 17:05, Chen Gang wrote:
> On 2013年04月25日 17:00, Michael Neuling wrote:
>>>>
>>>> Signed-off-by: Chen Gang <[email-masked]>
>>>> ---
>>>>  arch/powerpc/include/asm/kvm_asm.h   |    2 +-
>>>>  arch/powerpc/kernel/exceptions-64s.S |    6 +++---
>>>>  2 files changed, 4 insertions(+), 4 deletions(-)
>>>>
>>>> diff --git a/arch/powerpc/include/asm/kvm_asm.h b/arch/powerpc/include/asm/kvm_asm.h
>>>> index b9dd382..2c65bae 100644
>>>> --- a/arch/powerpc/include/asm/kvm_asm.h
>>>> +++ b/arch/powerpc/include/asm/kvm_asm.h
>>>> @@ -86,7 +86,7 @@
>>>>  #define BOOK3S_INTERRUPT_PROGRAM	0x700
>>>>  #define BOOK3S_INTERRUPT_FP_UNAVAIL	0x800
>>>>  #define BOOK3S_INTERRUPT_DECREMENTER	0x900
>>>> -#define BOOK3S_INTERRUPT_HV_DECREMENTER	0x980
>>>> +#define BOOK3S_INTERRUPT_HV_DECREMENTER	0x988
>> This is hardwird in the architecture.. you can't just move it
>>
> 

I think of a way to solve it: we just move the related code to another
area, after enter the original entry (e.g. 0x900), we let it jump to
that area to excuse the related code.

:-)

> OK, thank you, I need continue to fix it. It seems we have to read the
> details to shrink one instruction (4 bytes), at least.
> 
> Welcome additional suggestions or completions.
> 
> Thanks.
> 

-- 
Chen Gang

Asianux Corporation