Re: [rfc] Displaced stepping with wrong entry point address

Daniel Jacobowitz
2008-09-04T19:32:46Z

On Thu, Sep 04, 2008 at 09:28:06PM +0200, Ulrich Weigand wrote:
> > If SPU ever did support displaced stepping (not that this would be
> > terribly useful, but consider some other multi-architecture case),
> > would this be wrong for the SPU side code?
>
> Yes, of course -- we have different address spaces here, and we need
> to find a location within the address space of the current thread where
> to place the displaced instruction. No single address would work for
> both PowerPC and SPU code in a combined application.
>
> But I guess SPU could always install its own callback to handle those
> special cases ... (just as we install the ON_STACK dummy call location
> method because the AT_ENTRY method doesn't work for combined applications.)

In that case, maybe this is really specific to PowerPC; it sounds like
it won't work for any general multi-architecture target.

--
Daniel Jacobowitz
CodeSourcery