Re: [RFA] Fix watchpoints when stepping over a breakpoint

[Andrew Cagney <ac131313@cygnus.com>]

> Also bear in mind that if you have this sequence:
> - write to x
> - other instruction    <--- breakpoint here
> You will stop based on the watchpoint, because the watchpoint happens
> first.  You'll get a trap just before you would have hit the
> breakpoint. GDB handles this OK, and does report the watchpoint.  It's
> only if we expected a trap (single stepping for instance) that this
> does not work.  The current failure is "single step over something
> which triggers the watchpoint, landing on something with a breakpoint". 
> Without my patch, we detect that we are at an address with a
> breakpoint, and don't even try to check our watchpoints.

I suspect this is a design problem.  Blame DECR_PC?  The ``stop'' 
address gets confused with the PC value and the decr's probably screw it.

Andrew