1 files changed, 116 insertions, 0 deletions
diff --git a/gdb/target-dcache.c b/gdb/target-dcache.c
new file mode 100644
index 00000000000..bf046794ddf
--- /dev/null
+++ b/gdb/target-dcache.c
@@ -0,0 +1,116 @@
+/* Copyright (C) 1992-2013 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 "defs.h"
+#include "target-dcache.h"
+#include "gdbcmd.h"
+
+/* Cache of memory operations, to speed up remote access.  */
+static DCACHE *target_dcache;
+
+/* Target dcache is initialized or not.  */
+
+int
+target_dcache_init_p (void)
+{
+  return (target_dcache != NULL);
+}
+
+/* Invalidate the target dcache.  */
+
+void
+target_dcache_invalidate (void)
+{
+  if (target_dcache_init_p ())
+    dcache_invalidate (target_dcache);
+}
+
+/* Return the target dcache.  Return NULL if target dcache is not
+   initialized yet.  */
+
+DCACHE *
+target_dcache_get (void)
+{
+  return target_dcache;
+}
+
+/* Return the target dcache.  If it is not initialized yet, initialize
+   it.  */
+
+DCACHE *
+target_dcache_get_or_init (void)
+{
+  if (!target_dcache_init_p ())
+    target_dcache = dcache_init ();
+
+  return target_dcache;
+}
+
+/* The option sets this.  */
+static int stack_cache_enabled_p_1 = 1;
+/* And set_stack_cache_enabled_p updates this.
+   The reason for the separation is so that we don't flush the cache for
+   on->on transitions.  */
+static int stack_cache_enabled_p = 1;
+
+/* This is called *after* the stack-cache has been set.
+   Flush the cache for off->on and on->off transitions.
+   There's no real need to flush the cache for on->off transitions,
+   except cleanliness.  */
+
+static void
+set_stack_cache_enabled_p (char *args, int from_tty,
+			   struct cmd_list_element *c)
+{
+  if (stack_cache_enabled_p != stack_cache_enabled_p_1)
+    target_dcache_invalidate ();
+
+  stack_cache_enabled_p = stack_cache_enabled_p_1;
+}
+
+static void
+show_stack_cache_enabled_p (struct ui_file *file, int from_tty,
+			    struct cmd_list_element *c, const char *value)
+{
+  fprintf_filtered (file, _("Cache use for stack accesses is %s.\n"), value);
+}
+
+/* Return true if "stack cache" is enabled, otherwise, return false.  */
+
+int
+stack_cache_enabled (void)
+{
+  return stack_cache_enabled_p;
+}
+
+/* -Wmissing-prototypes */
+extern initialize_file_ftype _initialize_target_dcache;
+
+void
+_initialize_target_dcache (void)
+{
+  add_setshow_boolean_cmd ("stack-cache", class_support,
+			   &stack_cache_enabled_p_1, _("\
+Set cache use for stack access."), _("\
+Show cache use for stack access."), _("\
+When on, use the data cache for all stack access, regardless of any\n\
+configured memory regions.  This improves remote performance significantly.\n\
+By default, caching for stack access is on."),
+			   set_stack_cache_enabled_p,
+			   show_stack_cache_enabled_p,
+			   &setlist, &showlist);
+}