Re: prev_pc problem on ia64

["J. Johnston" <jjohnstn at redhat dot com>]

Andrew Cagney wrote:
> > >  > I tried to use target_has_execution but that did not work.  The error
> > >  > I get is that the process does not exist.  The read_pc() routine 
> > > for the ia64 is doing
> > >  > a read_register_pid() and it appears that the inferior_ptid is not 
> > > set up
> > >  > at a time when target_has_execution is set to true.
> > >
> > > target_has_execution doesn't mean that the target is executing. It is
> > > a total misnomer to indicate that the gdb target stratum is capable of
> > > execution. I think what you want is target_has_registers.
>
>
> > Arrrgh!  That problem, core file's also has registers ... so right 
> > theory, I've no idea on which thing to use in the test though.
>
>
> Hmm, ... but at least target_has_registers should only be true when the 
> target really does have the registers available.  I guess try it.
>
> Andrew

There is a problem in my choice of where to set prev_pc.  The inferior is not guaranteed
to be stopped when init_execution_control_state() is called so ptrace can fail when
asked to fetch the pc register.

I believe I have found a solution that avoids this problem by refreshing prev_pc in proceed()
just prior to resuming.  I will post a patch shortly.

-- Jeff J.