[PATCH] gdb: Add default reggroups for ARC

[Shahab Vahedi]

From: Shahab Vahedi <shahab@synopsys.com>

There is no reggroups set in ARC.  If a "maintenance print reggroups"
command is issued, the default register set is dumped (which is fine).

However, if a new group is added via an XML file, then that will
become the _only_ group.  This behavior causes gdb.xml/tdesc-regs.exp
to fail.

Fixes gdb.xml/tdesc-regs.exp on ARC.

gdb/ChangeLog:

	* arc-tdep.c (arc_add_reggroups): New function.
	(arc_gdbarch_init): Call arc_add_reggroups.
---
 gdb/arc-tdep.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/gdb/arc-tdep.c b/gdb/arc-tdep.c
index b19f7c5965a..8a1da1a9868 100644
--- a/gdb/arc-tdep.c
+++ b/gdb/arc-tdep.c
@@ -27,6 +27,7 @@
 #include "frame-base.h"
 #include "frame-unwind.h"
 #include "gdbcore.h"
+#include "reggroups.h"
 #include "gdbcmd.h"
 #include "objfiles.h"
 #include "osabi.h"
@@ -1954,6 +1955,20 @@ static const struct frame_base arc_normal_base = {
   arc_frame_base_address
 };
 
+/* Add all the expected register sets into GDBARCH.  */
+
+static void
+arc_add_reggroups (struct gdbarch *gdbarch)
+{
+  reggroup_add (gdbarch, general_reggroup);
+  reggroup_add (gdbarch, float_reggroup);
+  reggroup_add (gdbarch, system_reggroup);
+  reggroup_add (gdbarch, vector_reggroup);
+  reggroup_add (gdbarch, all_reggroup);
+  reggroup_add (gdbarch, save_reggroup);
+  reggroup_add (gdbarch, restore_reggroup);
+}
+
 static enum arc_isa
 mach_type_to_arc_isa (const unsigned long mach)
 {
@@ -2352,6 +2367,9 @@ arc_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   /* This doesn't include possible long-immediate value.  */
   set_gdbarch_max_insn_length (gdbarch, 4);
 
+  /* Add default register groups.  */
+  arc_add_reggroups (gdbarch);
+
   /* Frame unwinders and sniffers.  */
   dwarf2_frame_set_init_reg (gdbarch, arc_dwarf2_frame_init_reg);
   dwarf2_append_unwinders (gdbarch);
-- 
2.30.0