sw/device/tests/smc/smc_supervisor_mode_test.c

// Copyright 2023 Google LLC.
// Licensed under the Apache License, Version 2.0, see LICENSE for details.
// SPDX-License-Identifier: Apache-2.0

#include "hw/top_matcha/sw/autogen/top_matcha.h"
#include "sw/device/lib/runtime/log.h"
#include "sw/device/lib/runtime/print.h"
#include "sw/device/lib/testing/test_framework/check.h"
#include "sw/device/lib/testing/test_framework/ottf_test_config.h"
#include "sw/device/lib/testing/test_framework/status.h"
#include "sw/device/lib/testing/test_framework/test_util.h"

OTTF_DEFINE_TEST_CONFIG();

static dif_uart_t smc_uart;

static void smode_fn(void) { asm volatile("ecall"); }

// Overrides the default supervisor ecall handler.
// From here, we will set the test pass.
void ottf_supervisor_ecall_handler(void) { test_status_set(kTestStatusPassed); }

static __attribute__((naked)) void trampoline(uint32_t smode) {
  asm volatile(
      ".option push\n"
      ".option norelax\n"

      "li x1, 0x00000800\n"
      "csrw mstatus, x1\n"
      "csrw mepc, a0\n"
      "mret\n"
      ".option pop\n"
      :
      :
      : "memory");
}

void _ottf_main(void) {
  test_status_set(kTestStatusInTest);

  // Initialize the SMC UART to enable logging for non-DV simulation platforms.
  if (kDeviceType != kDeviceSimDV) {
    init_uart(TOP_MATCHA_SMC_UART_BASE_ADDR, &smc_uart);
  }

  LOG_INFO("Hello from the SMC!");

  trampoline((uint32_t)smode_fn);

  __builtin_unreachable();
}