eCTS: Add stack overflow test

This patch adds a test for stack overflow detection. CTS task tries
to overflow by calling a function recursively. This function sleeps
to incur context switch, where stack overflow is checked. Reboot is
expected but not checked.

BUG=chromium:663873
BRANCH=none
TEST=cts.py -m task

Change-Id: I6ad98d209acf873d2d23b48bac6fc751fa8c2f74
Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/410283
Reviewed-by: Randall Spangler <rspangler@chromium.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/cts/task/dut.c b/cts/task/dut.c
index ff1407a00b..e34dd0babb 100644
--- a/cts/task/dut.c
+++ b/cts/task/dut.c
@@ -117,8 +117,27 @@ enum cts_rc test_task_priority(void)
 	return CTS_RC_SUCCESS;
 }
 
+static void recurse(int x)
+{
+	CPRINTS("+%d", x);
+	msleep(1);
+	recurse(x + 1);
+	CPRINTS("-%d", x);
+}
+
+enum cts_rc test_stack_overflow(void);
+
 #include "cts_testlist.h"
 
+enum cts_rc test_stack_overflow(void)
+{
+	/* recurse() is expected to overflow the stack, which leads to reboot.
+	 * So, we print output proactively. */
+	CPRINTF("\n%s %d\n", tests[CTS_TEST_ID_COUNT - 1].name, CTS_RC_SUCCESS);
+	recurse(0);
+	return CTS_RC_FAILURE;
+}
+
 void cts_task(void)
 {
 	enum cts_rc rc;