On Sun, 2007-03-18 at 13:08 +0100, Andi Kleen wrote:
> > The idea is _NOT_ that you go look for references to the paravirt_ops
> > members structure, that would be stupid and you wouldn't be able to
> > use the most efficient addressing mode on a given cpu, you'd be
> > patching up indirect calls a
Andi Kleen wrote:
> Yes. All inline assembly tells gcc what registers are clobbered
> and it fills in the tables. Hand clobbering in inline assembly cannot
> be expressed with the current toolchain, so we moved all those
> out of line.
>
> But again I'm not sure it will work anyways. For once you w
On Sun, Mar 18, 2007 at 10:29:10AM -0700, Jeremy Fitzhardinge wrote:
> Andi Kleen wrote:
> > You could use the dwarf2 unwind tables. They have exact information
> > what register has what. But it would likely get complicated.
>
> Yes. And would they be accurate for hand-written asm, which is wher
Andi Kleen wrote:
> You could use the dwarf2 unwind tables. They have exact information
> what register has what. But it would likely get complicated.
Yes. And would they be accurate for hand-written asm, which is where we
have this problem?
J
___
> The bigger problem is that you don't know what registers you can
> clobber. For the pv_ops in hand-written asm, that a big pain. The code
> either has to assume the worst, or the "relocator" has to do something
> more sophisticated (like look for push/pop pairs surrounding the call,
> perhaps?)
Andi Kleen wrote:
>> The idea is _NOT_ that you go look for references to the paravirt_ops
>> members structure, that would be stupid and you wouldn't be able to
>> use the most efficient addressing mode on a given cpu, you'd be
>> patching up indirect calls and crap like that. Just say no...
>>
> The idea is _NOT_ that you go look for references to the paravirt_ops
> members structure, that would be stupid and you wouldn't be able to
> use the most efficient addressing mode on a given cpu, you'd be
> patching up indirect calls and crap like that. Just say no...
That wouldn't handle inli
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David Miller wrote:
> The idea is _NOT_ that you go look for references to the paravirt_ops
> members structure, that would be stupid and you wouldn't be able to
> use the most efficient addressing mode on a given cpu, you'd be
> patching up indirect calls and crap like that. Just say no...
>
> In
