Patch for gdb5.0; enable hardware watchpoints on UnixWare

[John Hughes]

> But all the i386v4-nat.c code has to be conditionalized on 
> UNIXWARE (or better yet, moved to a new i386sco-nat.c file), as
> i386v4-nat.c is used by x86 Solaris as well, and Solaris uses page
> faulting instead of debug registers for watchpoints, and would not
> compile with your patches installed.

Aha.  Here's a fixed version of the patch; the i386v4-nat.c changes
are conditional on UNIXWARE.

I didn't go as far as making a i386v42mp-nat.c file (I don't think
it should be called i386sco-nat.c, in a few months i386caldera-nat.c
would make about as much sense!).  I'm too lazy.  Sorry.

2000-10-30  John Hughes  <john@CalvaEDI.COM>

        * i386v4-nat.c (i386_insert_watchpoint, i386_remove_watchpoint,
        i386_check_watch_resources, i386_stopped_by_watchpoint,
        i386_insert_aligned_watchpoint, i386_insert_unaliged_watchpoint):
        use i386 debug registers to implement hardware watchpoints on
        UnixWare systems.

        * procfs.c (proc_family) allow access to family specific
        information (contains debug registers on UnixWare systems).

        * procfs.c (proc_command) allow other modules to issue commands
        to the procfs ctl file.

        * config/i386/tm-i386v42mp.c (TARGET_HAS_HARDWARE_WATCHPOINTS,
        TARGET_CAN_USE_HARDWARE_WATCHPOINT, HAVE_CONTINUABLE_WATCHPOINT,
        HAVE_STEPPABLE_WATCHPOINT, STOPPED_BY_WATCHPOINT,
        target_insert_watchpoint, target_remove_watchpoint): define.

-- 
John Hughes <john@Calva.COM>, 
        CalvaEDI SA.                            Tel: +33-1-4313-3131
        66 rue du Moulin de la Pointe,          Fax: +33-1-4313-3139
        75013 PARIS.