Re: [Qemu-devel] [v2 PATCH] target-mips: implement UserLocal Register

[Richard Henderson]

On 05/26/2014 07:32 PM, Petar Jovanovic wrote:
> 
> ________________________________________
> From: Richard Henderson address@hidden on behalf of Richard Henderson 
> address@hidden
> Sent: Tuesday, May 27, 2014 3:35 AM
> To: Petar Jovanovic; Petar Jovanovic; address@hidden
> Cc: address@hidden; James Hogan
> Subject: Re: [v2 PATCH] target-mips: implement UserLocal Register
> 
> On 05/26/2014 06:21 PM, Petar Jovanovic wrote:
>> Because we do not know the content of CP0_HWREna.
> 
>> We can know the same way we know the content of CP0_Config3.
> 
> Almost all the bits in CP0_Config3 including ULRI bit are read-only and 
> preset by
> hardware, thus checking bit ULRI at translation time is the same as checking 
> it
> at execution time. How can we know the content of CP0_HWREna at translation 
> time?

That's what tb->flags and env->hflags.  An encoding of cpu state at translation
time.


r~