[Bug translator/2438] Can't resolve $fd argument for sys_readv and sys_writev on ppc64

["fche at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

------- Additional Comments From fche at redhat dot com  2006-05-09 19:26 -------
(In reply to comment #5)
> [...] I just want 
> to say the first instruction (X) after the prologue may probably modify 
> the argument register, thus the location list entry will be inavailable.

It should not be unavailable.  The compiler should spell out where the arguments
are for all instructions.

> Since our prehandler is executed before (X), thus we can use its preceding
> one (X-4) to ask for the location list entry.

That would only make sense if the location list information for address X was
built to represent the *after-image* of the instruction.  I believe otherwise,
that the information represents the state *just before* the instruction would
be executed at address X.  Therefore, using the location list for address X,
for a probe at address X, would be exactly correct.

If for some reason the data does not match this intent, then there is 
probably a compiler bug.


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http://sourceware.org/bugzilla/show_bug.cgi?id=2438

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