Change tic6x target descriptions

This patch changes tic6x target descriptions to be more flexible.  Rebuild
tic6x-uclinux GDBserver with my x86 g++, and the unit test passes.

gdb:

2017-11-24  Yao Qi  <yao.qi@linaro.org>

	* arch/tic6x.c: New file.
	* arch/tic6x.h: New file.
	* features/Makefile (FEATURE_XMLFILES): Add tic6x-c6xp.xml,
	tic6x-core.xml and tic6x-gp.xml.
	* features/tic6x-c6xp.c: Generated.
	* features/tic6x-core.c: Generated.
	* features/tic6x-gp.c: Generated.
	* target-descriptions.c (maint_print_c_tdesc_cmd): Match
	"tic6x-".

gdb/gdbserver:

2017-11-24  Yao Qi  <yao.qi@linaro.org>

	* configure.srv: Set $srv_regobj for tic6x-linux.
	* linux-tic6x-low.c: Include "arch/tic6x.h" and "tdesc.h".
	(tic6x_read_description): Move some code to tic6x_arch_setup.
	(tic6x_tdesc_test): New function.
	(initialize_low_arch): Call selftests::register_test.

2 files changed, 73 insertions, 0 deletions

diff --git a/gdb/arch/tic6x.c b/gdb/arch/tic6x.c
new file mode 100644
index 0000000..5355b88
--- /dev/null
+++ b/gdb/arch/tic6x.c
@@ -0,0 +1,47 @@
+/* Copyright (C) 2017 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   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/>.  */
+
+#include "tdesc.h"
+#include "tic6x.h"
+#include "common/common-defs.h"
+
+#include "../features/tic6x-core.c"
+#include "../features/tic6x-gp.c"
+#include "../features/tic6x-c6xp.c"
+
+/* Create tic6x target descriptions according to FEATURE.  */
+
+target_desc *
+tic6x_create_target_description (enum c6x_feature feature)
+{
+  target_desc *tdesc = allocate_target_description ();
+
+  set_tdesc_architecture (tdesc, "tic6x");
+  set_tdesc_osabi (tdesc, "GNU/Linux");
+
+  long regnum = 0;
+
+  regnum = create_feature_tic6x_core (tdesc, regnum);
+
+  if (feature == C6X_GP || feature == C6X_C6XP)
+    regnum = create_feature_tic6x_gp (tdesc, regnum);
+
+  if (feature == C6X_C6XP)
+    regnum = create_feature_tic6x_c6xp (tdesc, regnum);
+
+  return tdesc;
+}
diff --git a/gdb/arch/tic6x.h b/gdb/arch/tic6x.h
new file mode 100644
index 0000000..1575af0
--- /dev/null
+++ b/gdb/arch/tic6x.h
@@ -0,0 +1,26 @@
+/* Copyright (C) 2017 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   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/>.  */
+
+enum c6x_feature
+{
+  C6X_CORE,
+  C6X_GP,
+  C6X_C6XP,
+  C6X_LAST,
+};
+
+target_desc *tic6x_create_target_description (enum c6x_feature feature);