3 files changed, 102 insertions, 0 deletions
diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 130de8a..3411f6c 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,5 +1,10 @@
 2020-12-13  Andrew Burgess  <andrew.burgess@embecosm.com>
 
+	* gdb.base/dcache-flush.c: New file.
+	* gdb.base/dcache-flush.exp: New file.
+
+2020-12-13  Andrew Burgess  <andrew.burgess@embecosm.com>
+
 	* gdb.base/c-linkage-name.exp: Update to use new 'maint flush ...'
 	commands.
 	* gdb.base/killed-outside.exp: Likewise.
diff --git a/gdb/testsuite/gdb.base/dcache-flush.c b/gdb/testsuite/gdb.base/dcache-flush.c
new file mode 100644
index 0000000..b512ea3
--- /dev/null
+++ b/gdb/testsuite/gdb.base/dcache-flush.c
@@ -0,0 +1,33 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2020 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/>.  */
+
+int __attribute__((noinline))
+func (int *v1, int *v2)
+{
+  return *v1 - *v2 - 1;
+}
+
+int
+main ()
+{
+  int var1 = 4;
+  int var2 = 3;
+  int res;
+
+  res = func (&var1, &var2);
+  return res;
+}
diff --git a/gdb/testsuite/gdb.base/dcache-flush.exp b/gdb/testsuite/gdb.base/dcache-flush.exp
new file mode 100644
index 0000000..6c7d2f4
--- /dev/null
+++ b/gdb/testsuite/gdb.base/dcache-flush.exp
@@ -0,0 +1,64 @@
+# Copyright 2020 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/>.
+
+# Test that the dcache can be flushed.
+
+standard_testfile
+
+if { [prepare_for_testing "failed to prepare" ${testfile}] } {
+    return -1
+}
+
+if ![runto func] {
+    return -1
+}
+
+gdb_test "up" ".* main .*"
+gdb_test "p var1" " = 4"
+gdb_test "p var2" " = 3"
+
+# By reading var1 and var2 we should have at least one line in the
+# dcache.
+gdb_test "info dcache" \
+    [multi_line \
+	 "Dcache $decimal lines of $decimal bytes each." \
+	 "Contains data for process $decimal" \
+	 "Line 0: address $hex \[$decimal hits\].*" \
+	 "Cache state: $decimal active lines, $decimal hits" ] \
+    "check dcache before flushing"
+
+# Flush the dcache.
+gdb_test "maint flush dcache" "The dcache was flushed\."
+
+# Check the dcache is now empty.
+gdb_test "info dcache" \
+    [multi_line  "Dcache $decimal lines of $decimal bytes each." \
+	 "No data cache available." ] \
+    "check dcache after flushing"
+
+# Read the stack variables again, refilling the dcache.
+with_test_prefix "refilling" {
+    gdb_test "p var1" " = 4"
+    gdb_test "p var2" " = 3"
+}
+
+# And check we have some content back in the dcache.
+gdb_test "info dcache" \
+    [multi_line \
+	 "Dcache $decimal lines of $decimal bytes each." \
+	 "Contains data for process $decimal" \
+	 "Line 0: address $hex \[$decimal hits\].*" \
+	 "Cache state: $decimal active lines, $decimal hits" ] \
+    "check dcache before refilling"