On Sun, Jun 03, 2007 at 11:09:34PM +0100, Pedro Alves wrote:
> Kevin O'Connor wrote:
> > So, is it possible to have mingw32ce install a global SEH handler that
> > just translates the exception into an sjlj one? That is, can we
> > modify the standard crt0.S file so that it causes wince exceptions to
> > raise C++ exceptions that g++ can then handle?
> >
>
> Maybe, but it would be tricky.
>[...]
> The cegcc's crt0.S, start.c and __eh_handler.S files implement
> something similar which may help as a starting point.
Hrmm. I have another problem - it looks like gcc will optimize away
try/catch blocks if it doesn't think the code can throw an exception.
If we went down this route, would it be possible to prevent gcc from
doing that?
> > However, I'm a bit concerned with using IsBad{Read,Write}Ptr.
> You're right, the WinCE version of the docs isn't clear. I've seen
> several discussions on IsBad*Ptr, and always understood it as using
> a __try/__except block inside.
I'm not sure how it would do that. What would IsBadWritePtr(x, 400)
actually write to memory? If it did actually generate extra
read/write memory accesses that would be really bad - in haret we use
these routines to get at memory mapped registers, and extra accesses
could confuse the chips.
Also, haret is used on wince 2.11 - 6.0. You can imagine all the
weird ways wince versions differ. :-)
> <need a hammer?>
> You can also try creating a child process to take care of
> the dangerous writing. If the app crashes, you know you had a bad pointer :)
> You could feed the data to the child process through some kind of IPC.
> Eh, pipes would be nice. :)
> </need a hammer?>
Heh. :-)
-Kevin
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