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* Copyright (c) 2017 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr.h>
#include <ztest.h>
#include <tc_util.h>
#include <kernel_structs.h>
#include <irq_offload.h>
#include <kswap.h>
#if defined(CONFIG_X86) && defined(CONFIG_X86_MMU)
#define STACKSIZE (8192)
#else
#define STACKSIZE (2048)
#endif
#define MAIN_PRIORITY 7
#define PRIORITY 5
static K_THREAD_STACK_DEFINE(alt_stack, STACKSIZE);
#ifdef CONFIG_STACK_SENTINEL
#define OVERFLOW_STACKSIZE (STACKSIZE / 2)
static k_thread_stack_t *overflow_stack =
alt_stack + (STACKSIZE - OVERFLOW_STACKSIZE);
#else
#define OVERFLOW_STACKSIZE STACKSIZE
#endif
static struct k_thread alt_thread;
volatile int rv;
static volatile int crash_reason;
/* On some architectures, k_thread_abort(_current) will return instead
* of _Swap'ing away.
*
* On ARM the PendSV exception is queued and immediately fires upon
* completing the exception path; the faulting thread is never run
* again.
*
* On Xtensa/asm2 the handler is running in interrupt context and on
* the interrupt stack and needs to return through the interrupt exit
* code.
*
* In both cases the thread is guaranteed never to run again once we
* return from the _SysFatalErrorHandler().
*/
#if !(defined(CONFIG_ARM) || defined(CONFIG_XTENSA_ASM2) || defined(CONFIG_ARC))
#define ERR_IS_NORETURN 1
#endif
#ifdef ERR_IS_NORETURN
FUNC_NORETURN
#endif
void _SysFatalErrorHandler(unsigned int reason, const NANO_ESF *pEsf)
{
TC_PRINT("Caught system error -- reason %d\n", reason);
crash_reason = reason;
k_thread_abort(_current);
#ifdef ERR_IS_NORETURN
CODE_UNREACHABLE;
#endif
}
void alt_thread1(void)
{
#if defined(CONFIG_X86)
__asm__ volatile ("ud2");
#elif defined(CONFIG_NIOS2)
__asm__ volatile ("trap");
#elif defined(CONFIG_ARC)
__asm__ volatile ("swi");
#else
/* Triggers usage fault on ARM, illegal instruction on RISCV32
* and xtensa
*/
{
int illegal = 0;
((void(*)(void))&illegal)();
}
#endif
rv = TC_FAIL;
}
void alt_thread2(void)
{
int key;
key = irq_lock();
k_oops();
TC_ERROR("SHOULD NEVER SEE THIS\n");
rv = TC_FAIL;
irq_unlock(key);
}
void alt_thread3(void)
{
int key;
key = irq_lock();
k_panic();
TC_ERROR("SHOULD NEVER SEE THIS\n");
rv = TC_FAIL;
irq_unlock(key);
}
void blow_up_stack(void)
{
char buf[OVERFLOW_STACKSIZE];
TC_PRINT("posting %zu bytes of junk to stack...\n", sizeof(buf));
memset(buf, 0xbb, sizeof(buf));
}
void stack_thread1(void)
{
/* Test that stack overflow check due to timer interrupt works */
blow_up_stack();
TC_PRINT("busy waiting...\n");
k_busy_wait(1024 * 1024);
TC_ERROR("should never see this\n");
rv = TC_FAIL;
}
void stack_thread2(void)
{
int key = irq_lock();
/* Test that stack overflow check due to swap works */
blow_up_stack();
TC_PRINT("swapping...\n");
_Swap(irq_lock());
TC_ERROR("should never see this\n");
rv = TC_FAIL;
irq_unlock(key);
}
void test_fatal(void)
{
int expected_reason;
#if defined(CONFIG_ARCH_POSIX)
ARG_UNUSED(expected_reason);
ARG_UNUSED(overflow_stack);
#endif
rv = TC_PASS;
/*
* Main thread(test_main) priority was 10 but ztest thread runs at
* priority -1. To run the test smoothly make both main and ztest
* threads run at same priority level.
*/
k_thread_priority_set(_current, K_PRIO_PREEMPT(MAIN_PRIORITY));
#ifndef CONFIG_ARCH_POSIX
TC_PRINT("test alt thread 1: generic CPU exception\n");
k_thread_create(&alt_thread, alt_stack,
K_THREAD_STACK_SIZEOF(alt_stack),
(k_thread_entry_t)alt_thread1,
NULL, NULL, NULL, K_PRIO_COOP(PRIORITY), 0,
K_NO_WAIT);
zassert_not_equal(rv, TC_FAIL, "thread was not aborted\n");
#else
/*
* We want the native OS to handle segfaults so we can debug it
* with the normal linux tools
*/
TC_PRINT("test alt thread 1: skipped for POSIX ARCH\n");
#endif
TC_PRINT("test alt thread 2: initiate kernel oops\n");
k_thread_create(&alt_thread, alt_stack,
K_THREAD_STACK_SIZEOF(alt_stack),
(k_thread_entry_t)alt_thread2,
NULL, NULL, NULL, K_PRIO_COOP(PRIORITY), 0,
K_NO_WAIT);
k_thread_abort(&alt_thread);
zassert_equal(crash_reason, _NANO_ERR_KERNEL_OOPS,
"bad reason code got %d expected %d\n",
crash_reason, _NANO_ERR_KERNEL_OOPS);
zassert_not_equal(rv, TC_FAIL, "thread was not aborted\n");
TC_PRINT("test alt thread 3: initiate kernel panic\n");
k_thread_create(&alt_thread, alt_stack,
K_THREAD_STACK_SIZEOF(alt_stack),
(k_thread_entry_t)alt_thread3,
NULL, NULL, NULL, K_PRIO_COOP(PRIORITY), 0,
K_NO_WAIT);
k_thread_abort(&alt_thread);
zassert_equal(crash_reason, _NANO_ERR_KERNEL_PANIC,
"bad reason code got %d expected %d\n",
crash_reason, _NANO_ERR_KERNEL_PANIC);
zassert_not_equal(rv, TC_FAIL, "thread was not aborted\n");
#ifndef CONFIG_ARCH_POSIX
TC_PRINT("test stack overflow - timer irq\n");
#ifdef CONFIG_STACK_SENTINEL
/* When testing stack sentinel feature, the overflow stack is a
* smaller section of alt_stack near the end.
* In this way when it gets overflowed by blow_up_stack() we don't
* corrupt anything else and prevent the test case from completing.
*/
k_thread_create(&alt_thread, overflow_stack, OVERFLOW_STACKSIZE,
#else
k_thread_create(&alt_thread, alt_stack,
K_THREAD_STACK_SIZEOF(alt_stack),
#endif
(k_thread_entry_t)stack_thread1,
NULL, NULL, NULL, K_PRIO_PREEMPT(PRIORITY), 0,
K_NO_WAIT);
expected_reason = _NANO_ERR_STACK_CHK_FAIL;
zassert_equal(crash_reason, expected_reason,
"bad reason code got %d expected %d\n",
crash_reason, expected_reason);
zassert_not_equal(rv, TC_FAIL, "thread was not aborted\n");
/* Stack sentinel has to be invoked, make sure it happens during
* a context switch. Also ensure HW-based solutions can run more
* than once.
*/
TC_PRINT("test stack overflow - swap\n");
#ifdef CONFIG_STACK_SENTINEL
k_thread_create(&alt_thread, overflow_stack, OVERFLOW_STACKSIZE,
#else
k_thread_create(&alt_thread, alt_stack,
K_THREAD_STACK_SIZEOF(alt_stack),
#endif
(k_thread_entry_t)stack_thread2,
NULL, NULL, NULL, K_PRIO_PREEMPT(PRIORITY), 0,
K_NO_WAIT);
zassert_equal(crash_reason, _NANO_ERR_STACK_CHK_FAIL,
"bad reason code got %d expected %d\n",
crash_reason, _NANO_ERR_STACK_CHK_FAIL);
zassert_not_equal(rv, TC_FAIL, "thread was not aborted\n");
#else
TC_PRINT("test stack overflow - skipped for POSIX arch\n");
/*
* We do not have a stack check for the posix ARCH
* again we relay on the native OS
*/
#endif
}
/*test case main entry*/
void test_main(void)
{
ztest_test_suite(fatal,
ztest_unit_test(test_fatal));
ztest_run_test_suite(fatal);
}
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