A new board file remote-gdbserver-on-localhost.exp

This patch is to add a new board file that does real remote gdbserver
testing on localhost.  This board file can be used to reproduce PR 18208.

gdb/testsuite

2015-04-24  Yao Qi  <yao.qi@linaro.org>

	* boards/remote-gdbserver-on-localhost.exp: New file.

gdb/testsuite/ChangeLog

@@ -1,3 +1,7 @@
+2015-04-24  Yao Qi  <yao.qi@linaro.org>
+
+	* boards/remote-gdbserver-on-localhost.exp: New file.
+
 2015-04-23  Pedro Alves  <palves@redhat.com>
 
 	* gdb.base/interrupt.exp: Use an indirect spawn id list holding

gdb/testsuite/boards/remote-gdbserver-on-localhost.exp

@@ -0,0 +1,79 @@
+# Copyright 2015 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# This file is a dejagnu "board file" and is used to run the testsuite
+# with remote gdbserver on localhost.
+#
+# To use this file:
+# bash$ cd ${build_dir}/gdb
+# bash$ make check RUNTESTFLAGS="--target_board=remote-gdbserver-on-localhost"
+
+load_generic_config "gdbserver"
+
+# The default compiler for this target.
+set_board_info compiler  "[find_gcc]"
+
+process_multilib_options ""
+
+set_board_info rcp_prog "/usr/bin/scp"
+set_board_info rsh_prog "/usr/bin/ssh"
+set_board_info protocol standard
+set_board_info username $env(USER)
+set_board_info hostname localhost
+
+# We will be using the standard GDB remote protocol
+set_board_info gdb_protocol "remote"
+
+# Test the copy of gdbserver in the build directory, of an absolute path.
+set_board_info gdb_server_prog "[pwd]/../gdbserver/gdbserver"
+
+# Use techniques appropriate to a stub
+set_board_info use_gdb_stub 1
+
+# This gdbserver can only run a process once per session.
+set_board_info gdb,do_reload_on_run 1
+
+# gdbserver does not intercept target file operations and perform them
+# on the host.
+set_board_info gdb,nofileio 1
+
+# There's no support for argument-passing (yet).
+set_board_info noargs 1
+
+set_board_info exit_is_reliable 1
+
+# The predefined TSVs in GDBserver.
+set_board_info gdb,predefined_tsv "\\\$trace_timestamp"
+
+set GDBFLAGS "${GDBFLAGS} -ex \"set auto-connect-native-target off\""
+
+proc ${board}_download { board src dest } {
+    if { [file pathtype $src] == "relative" } {
+	return [file join [pwd] $src]
+    } else {
+	return $src
+    }
+}
+
+proc ${board}_upload {dest srcfile args} {
+    return $srcfile
+}
+
+proc ${board}_file { dest op args } {
+    if { $op == "delete" } {
+	return 0
+    }
+    return [eval [list standard_file $dest $op] $args]
+}