Re: [RFC]: MD_FALLBACK_FRAME_STATE_FOR macro for darwin PPC

[Geoffrey Keating <geoffk at apple dot com>]

On 20/01/2004, at 2:21 PM, Andreas Tobler wrote:

> Geoffrey Keating wrote:
>
> > On 20/01/2004, at 12:37 PM, Andreas Tobler wrote:
> > > So, the question is, how do I check inside darwin.h which OS version 
> > > I have?
> > You check with code like this:
> > > +    if (*(unsigned int *) (pc_ + 0) != 0x2e1e0032)            \
> > > +      break;                                \
> > > +    if (*(unsigned int *) (pc_ + 4) == 0x40be0050            \
> > > +    || *(unsigned int *) (pc_ + 4) == 0x41920010)            \
> > You should make enough tests to make sure that you don't falsely 
> > identify any darwin version (past or future), by checking every 
> > instruction that would have been executed on a return from a signal 
> > handler.
>
> Hm!
>
> future?
>
> Well, I have limited resources here, one powerbook, which is three 
> years old and is also my production machine.
>
> I see what I can do. It will certainly take a longer time.
>
> Also I have first to find out about all different versions and how to 
> get them. ( I hope I understood you right)

You don't actually need every version (I do not know how you would try 
to acquire every future version of darwin, it seems like you'd need a 
time machine).  You just have to check the entire instruction sequence.

> Andreas*
>
> *wondering why this macro has not already been implemented before..... 
> seems so easy.

I haven't done it because it's a lot of work.