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Re: [Fwd: Re: [RFA 3/5] Prec: x86 segment register support: target]
On Mon, Mar 22, 2010 at 7:59 PM, Hui Zhu <teawater@gmail.com> wrote:
> On Tue, Mar 23, 2010 at 02:47, Doug Evans <dje@google.com> wrote:
>> On Mon, Mar 22, 2010 at 11:26 AM, Michael Snyder <msnyder@vmware.com> wrote:
>>> I'd just like to point out that while all this sounds great,
>>> it shouldn't be a prerequisite to the original task of just
>>> getting prec to record the segments and offsets correctly.
>>>
>>> Maybe we should split these two tasks, so that Teawater can
>>> go ahead and accomplish his.
>>
>> To the extent that they can be split, IWBN alright.
>>
>> I wonder if the interface is sufficient though (setting aside where to
>> put it and how it will look).
>> Any particular o/s might not provide sufficient hooks of course.
>> linux's modify_ldt, AIUI, let's one change more than just foo_base.
>> NativeClient http://code.google.com/p/nativeclient/ uses it, for example.
>>
>
> Thanks Doug.
>
> I suggest we support segment base step by step.
> When the OS that support it will show the xxx_base to user, the
> unsupport OS will show nothing.
>
> What do you think about it?
Is supporting segment base sufficient?
Or do you also need to support, e.g., segment limit and flags too?
There may be more, but they're the two that come to mind.
[That's what I was referring to regarding whether the interface was sufficient.]