John Baldwin c1dae0a6a0 fbsd-tdep: Implement the vsyscall_range gdbarch hook.
FreeBSD recently added a real vDSO in its shared page for the amd64
architecture.  The vDSO is mapped at the address given by the
AT_KPRELOAD ELF auxiliary vector entry.  To find the end of the
mapping range, parse the list of virtual map entries used by 'info
proc mappings' either from the NT_PROCSTAT_VMMAP core dump note, or
via the kinfo_getvmmap function for native targets (fetched from the
native target as the TARGET_OBJECT_FREEBSD_VMMAP object).

This silences warnings on recent FreeBSD/amd64 kernels due to not
finding symbols for the vdso:

warning: Could not load shared library symbols for [vdso].
Do you need "set solib-search-path" or "set sysroot"?
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		   README for GNU development tools

This directory contains various GNU compilers, assemblers, linkers, 
debuggers, etc., plus their support routines, definitions, and documentation.

If you are receiving this as part of a GDB release, see the file gdb/README.
If with a binutils release, see binutils/README;  if with a libg++ release,
see libg++/README, etc.  That'll give you info about this
package -- supported targets, how to use it, how to report bugs, etc.

It is now possible to automatically configure and build a variety of
tools with one command.  To build all of the tools contained herein,
run the ``configure'' script here, e.g.:

	./configure 
	make

To install them (by default in /usr/local/bin, /usr/local/lib, etc),
then do:
	make install

(If the configure script can't determine your type of computer, give it
the name as an argument, for instance ``./configure sun4''.  You can
use the script ``config.sub'' to test whether a name is recognized; if
it is, config.sub translates it to a triplet specifying CPU, vendor,
and OS.)

If you have more than one compiler on your system, it is often best to
explicitly set CC in the environment before running configure, and to
also set CC when running make.  For example (assuming sh/bash/ksh):

	CC=gcc ./configure
	make

A similar example using csh:

	setenv CC gcc
	./configure
	make

Much of the code and documentation enclosed is copyright by
the Free Software Foundation, Inc.  See the file COPYING or
COPYING.LIB in the various directories, for a description of the
GNU General Public License terms under which you can copy the files.

REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info
on where and how to report problems.
Description
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