Patch to implement set remote hardware-watchpoint-length-limit

["Philippe Waroquiers" <philippe.waroquiers@skynet.be>]

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This patch allows to set the limit of the length of hardware watchpoints.
This allows a.o. unlimited "simulated hardware" watchpoints 
with a gdbserver embedded in Valgrind. See 
http://bugs.kde.org/show_bug.cgi?id=214909

Philippe

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Index: gdb/remote.c
===================================================================
RCS file: /cvs/src/src/gdb/remote.c,v
retrieving revision 1.441
diff -r1.441 remote.c
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> int remote_hw_watchpoint_length_limit = -1;
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> remote_region_ok_for_hw_watchpoint (CORE_ADDR addr, int len)
> {
>   if (remote_hw_watchpoint_length_limit == 0)
>     return 0;
>   else if (remote_hw_watchpoint_length_limit < 0)
>     return 1;
>   else if (len <= remote_hw_watchpoint_length_limit)
>     return 1;
>   else
>     return 0;
> }
> 
> static int
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>   remote_ops.to_region_ok_for_hw_watchpoint
>      = remote_region_ok_for_hw_watchpoint;
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>   add_setshow_zinteger_cmd ("hardware-watchpoint-length-limit", no_class,
> 			    &remote_hw_watchpoint_length_limit, _("\
> Set the maximum length of a target hardware watchpoint."), _("\
> Show the maximum length of a target hardware watchpoint."), _("\
> Specify a negative limit for unlimited."),
> 			    NULL, NULL, /* FIXME: i18n: The maximum length of a target hardware watchpoint is %s.  */
> 			    &remote_set_cmdlist, &remote_show_cmdlist);
Index: gdb/doc/gdb.texinfo
===================================================================
RCS file: /cvs/src/src/gdb/doc/gdb.texinfo,v
retrieving revision 1.814
diff -r1.814 gdb.texinfo
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> @cindex limit hardware watchpoints length
> @cindex remote target, limit watchpoints length
> @anchor{set remote hardware-watchpoint-length-limit}
> @item set remote hardware-watchpoint-length-limit @var{limit}
> Restrict @value{GDBN} to using @var{limit} for the maximum length of
> remote hardware watchpoints.  A limit of -1, the default, is treated
> as unlimited.
>