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/*
* Copyright (C) 2016 Loci Controls Inc.
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup tests
* @{
*
* @file
* @brief Test application for the mpu_stack_guard pseudo-module
*
* @author Ian Martin <ian@locicontrols.com>
*
* @}
*/
#include <stdio.h>
#include "cpu.h"
#include "thread.h"
#define CANARY_VALUE 0xdeadbeef
static struct {
unsigned int canary;
char stack[THREAD_STACKSIZE_MAIN];
} buf;
static int recurse(int counter)
{
printf("counter =%4d, SP = 0x%08x, canary = 0x%08x\n", counter, (unsigned int)__get_PSP(), buf.canary);
if (buf.canary != CANARY_VALUE) {
printf("canary = 0x%08x\nTest failed.\n", buf.canary);
for (;;) {
thread_sleep();
}
}
counter++;
/* Recursing twice here prevents the compiler from optimizing-out the recursion. */
return recurse(counter) + recurse(counter);
}
static void *thread(void *arg)
{
(void) arg;
recurse(0);
return NULL;
}
int main(void)
{
puts("\nMPU Stack Guard Test\n");
puts("If the test fails, the canary value will change unexpectedly");
puts("after ~150 iterations. If the test succeeds, the MEM MANAGE HANDLER");
puts("will trigger a RIOT kernel panic before the canary value changes.\n");
#ifdef MODULE_MPU_STACK_GUARD
puts("The mpu_stack_guard module is present. Expect the test to succeed.\n");
#else
puts("The mpu_stack_guard module is missing! Expect the test to fail.\n");
#endif
buf.canary = CANARY_VALUE;
thread_create(buf.stack, sizeof(buf.stack), THREAD_PRIORITY_MAIN - 1, 0, thread, NULL, "thread");
return 0;
}