Re: [Qemu-devel] cpu_regs in target-i386

[Xin Tong]

If i understand correctly here, those are just array of offsets for
the emulated registers such that the tcg can easily get access to the
address of the emulated registers. This is, however, different from
the env (CPUx86State) variable which will always have a host register
pointing to it ( host register is made to point to env in the tb enter
prologue).

Thanks

Xin


On Sun, Nov 27, 2011 at 9:12 AM, Andreas Färber <address@hidden> wrote:
> Am 27.11.2011 14:46, schrieb Xin Tong:
>> When the x86 vcpu is initialized, a CPUX86State is qemu_mallocz'ed.
>> env is used to point to it and modifications to the CPUX86State can
>> thereby be done via the register that contains the env. I do not get
>> what the cpu_regs[CPU_NB_REGS] are for, do not we already have a set
>> of emulated x86 registers when we allocate the CPUX86State ?
>
> I assume in i386, too, it will be a TCGv array and will be initialized
> to point to individual memory offsets inside CPU*State.
> So they're for convenience and readability.
>
> HTE,
> Andreas
>
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