(thanks Pierre for bringing this issue up!)

> OK, though I think "Invalid argument to displaced_write_reg" might be a
> better error.

Just to help speed things up, here is what I checked in:

2009-09-03  Pierre Muller <muller@ics.u-strasbg.fr>
            Richard Earnshaw <rearnsha@arm.com>

        * arm-tdep.c (displaced_write_reg): Replace call to abort by call
        to internal_error.

Tested by recompiling arm-tdep.c only.

-- 
Joel