Simulator exit test added

sw/cheri/checks/CMakeLists.txt

@@ -6,6 +6,7 @@ set(CHECKS
   gpio_check.cc
   lcd_check.cc
   uart_check.cc
+  uart_simexit_check.cc
   sdraw_check.cc
   spi_test.cc
   system_info_check.cc

sw/cheri/checks/uart_simexit_check.cc

@@ -0,0 +1,40 @@
+/**
+ * Copyright lowRISC contributors.
+ * Licensed under the Apache License, Version 2.0, see LICENSE for details.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#define CHERIOT_NO_AMBIENT_MALLOC
+#define CHERIOT_NO_NEW_DELETE
+#define CHERIOT_PLATFORM_CUSTOM_UART
+
+#include <stdint.h>
+
+// clang-format off
+#include "../../common/defs.h"
+#include <cheri.hh>
+// clang-format on
+#include <platform-uart.hh>
+#include "../common/uart-utils.hh"
+
+using namespace CHERI;
+
+/**
+ * C++ entry point for the loader.  This is called from assembly, with the
+ * read-write root in the first argument.
+ */
+[[noreturn]] extern "C" void entry_point(void* rwRoot) {
+  Capability<void> root{rwRoot};
+
+  // Create a bounded capability to the UART
+  Capability<volatile OpenTitanUart> uart = root.cast<volatile OpenTitanUart>();
+  uart.address()                          = UART_ADDRESS;
+  uart.bounds()                           = UART_BOUNDS;
+
+  uart->init(BAUD_RATE);
+  write_str(uart, "Trying out simulation exit!\r\n");
+  write_str(uart, "Safe to exit simulator.\xd8\xaf\xfb\xa0\xc7\xe1\xa9\xd7");
+  write_str(uart, "This should not be printed.\r\n");
+  write_str(uart, "FAIL\r\n");
+  while (true);
+}