feat(rcar3): enable the stack protection
This commit changes ENABLE_STACK_PROTECTOR value to "strong" for
enabling the stack protector by canary.
Signed-off-by: Koichi Yamaguchi <koichi.yamaguchi.zb@hitachi.com>
Signed-off-by: Toshiyuki Ogasahara <toshiyuki.ogasahara.bo@hitachi.com>
Signed-off-by: Yoshifumi Hosoya <yoshifumi.hosoya.wj@renesas.com>
Change-Id: Ice351d23c98daf12737a5e65cef743035d62dabe
diff --git a/plat/renesas/rcar/rcar_stack_protector.c b/plat/renesas/rcar/rcar_stack_protector.c
new file mode 100644
index 0000000..ecceef4
--- /dev/null
+++ b/plat/renesas/rcar/rcar_stack_protector.c
@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2021-2023, Renesas Electronics Corporation. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <stdint.h>
+
+#include <arch_helpers.h>
+#include <common/debug.h>
+
+#define RANDOM_CANARY_VALUE ((u_register_t)0xDFF5FC8A720E205EULL)
+
+u_register_t plat_get_stack_protector_canary(void)
+{
+ u_register_t cnt;
+ u_register_t seed;
+ u_register_t mul;
+ u_register_t ret;
+ uintptr_t val1 = (uintptr_t)__builtin_return_address(0U);
+ uintptr_t val2 = (uintptr_t)__builtin_frame_address(0U);
+
+ cnt = read_cntpct_el0();
+ seed = (cnt ^ RANDOM_CANARY_VALUE) & ULONG_MAX;
+ ret = seed;
+
+ if ((ULONG_MAX/val1) > seed) {
+ mul = (u_register_t)(val1 * seed);
+ if ((mul < ULONG_MAX) &&
+ ((ULONG_MAX - (u_register_t)mul) > val2)) {
+ ret = mul + val2;
+ }
+ }
+
+ return ret;
+}