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zephyr/kernel/thread.c

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/*
* Copyright (c) 2010-2014 Wind River Systems, Inc.
*
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @file
* @brief Kernel thread support
*
* This module provides general purpose thread support.
*/
#include <kernel.h>
#include <spinlock.h>
#include <sys/math_extras.h>
#include <sys_clock.h>
#include <ksched.h>
#include <wait_q.h>
#include <syscall_handler.h>
#include <kernel_internal.h>
#include <kswap.h>
#include <init.h>
#include <tracing/tracing.h>
#include <string.h>
#include <stdbool.h>
#include <irq_offload.h>
#include <sys/check.h>
#include <random/rand32.h>
#include <sys/atomic.h>
#include <logging/log.h>
LOG_MODULE_DECLARE(os, CONFIG_KERNEL_LOG_LEVEL);
#ifdef CONFIG_THREAD_MONITOR
/* This lock protects the linked list of active threads; i.e. the
* initial _kernel.threads pointer and the linked list made up of
* thread->next_thread (until NULL)
*/
static struct k_spinlock z_thread_monitor_lock;
#endif /* CONFIG_THREAD_MONITOR */
#define _FOREACH_STATIC_THREAD(thread_data) \
STRUCT_SECTION_FOREACH(_static_thread_data, thread_data)
void k_thread_foreach(k_thread_user_cb_t user_cb, void *user_data)
{
#if defined(CONFIG_THREAD_MONITOR)
struct k_thread *thread;
k_spinlock_key_t key;
__ASSERT(user_cb != NULL, "user_cb can not be NULL");
/*
* Lock is needed to make sure that the _kernel.threads is not being
* modified by the user_cb either directly or indirectly.
* The indirect ways are through calling k_thread_create and
* k_thread_abort from user_cb.
*/
key = k_spin_lock(&z_thread_monitor_lock);
SYS_PORT_TRACING_FUNC_ENTER(k_thread, foreach);
for (thread = _kernel.threads; thread; thread = thread->next_thread) {
user_cb(thread, user_data);
}
SYS_PORT_TRACING_FUNC_EXIT(k_thread, foreach);
k_spin_unlock(&z_thread_monitor_lock, key);
#endif
}
void k_thread_foreach_unlocked(k_thread_user_cb_t user_cb, void *user_data)
{
#if defined(CONFIG_THREAD_MONITOR)
struct k_thread *thread;
k_spinlock_key_t key;
__ASSERT(user_cb != NULL, "user_cb can not be NULL");
key = k_spin_lock(&z_thread_monitor_lock);
SYS_PORT_TRACING_FUNC_ENTER(k_thread, foreach_unlocked);
for (thread = _kernel.threads; thread; thread = thread->next_thread) {
k_spin_unlock(&z_thread_monitor_lock, key);
user_cb(thread, user_data);
key = k_spin_lock(&z_thread_monitor_lock);
}
SYS_PORT_TRACING_FUNC_EXIT(k_thread, foreach_unlocked);
k_spin_unlock(&z_thread_monitor_lock, key);
#endif
}
bool k_is_in_isr(void)
{
return arch_is_in_isr();
}
/*
* This function tags the current thread as essential to system operation.
* Exceptions raised by this thread will be treated as a fatal system error.
*/
void z_thread_essential_set(void)
{
_current->base.user_options |= K_ESSENTIAL;
}
/*
* This function tags the current thread as not essential to system operation.
* Exceptions raised by this thread may be recoverable.
* (This is the default tag for a thread.)
*/
void z_thread_essential_clear(void)
{
_current->base.user_options &= ~K_ESSENTIAL;
}
/*
* This routine indicates if the current thread is an essential system thread.
*
* Returns true if current thread is essential, false if it is not.
*/
bool z_is_thread_essential(void)
{
return (_current->base.user_options & K_ESSENTIAL) == K_ESSENTIAL;
}
#ifdef CONFIG_THREAD_CUSTOM_DATA
void z_impl_k_thread_custom_data_set(void *value)
{
_current->custom_data = value;
}
#ifdef CONFIG_USERSPACE
static inline void z_vrfy_k_thread_custom_data_set(void *data)
{
z_impl_k_thread_custom_data_set(data);
}
#include <syscalls/k_thread_custom_data_set_mrsh.c>
#endif
void *z_impl_k_thread_custom_data_get(void)
{
return _current->custom_data;
}
#ifdef CONFIG_USERSPACE
static inline void *z_vrfy_k_thread_custom_data_get(void)
{
return z_impl_k_thread_custom_data_get();
}
#include <syscalls/k_thread_custom_data_get_mrsh.c>
#endif /* CONFIG_USERSPACE */
#endif /* CONFIG_THREAD_CUSTOM_DATA */
#if defined(CONFIG_THREAD_MONITOR)
/*
* Remove a thread from the kernel's list of active threads.
*/
void z_thread_monitor_exit(struct k_thread *thread)
{
k_spinlock_key_t key = k_spin_lock(&z_thread_monitor_lock);
if (thread == _kernel.threads) {
_kernel.threads = _kernel.threads->next_thread;
} else {
struct k_thread *prev_thread;
prev_thread = _kernel.threads;
while ((prev_thread != NULL) &&
(thread != prev_thread->next_thread)) {
prev_thread = prev_thread->next_thread;
}
if (prev_thread != NULL) {
prev_thread->next_thread = thread->next_thread;
}
}
k_spin_unlock(&z_thread_monitor_lock, key);
}
#endif
int z_impl_k_thread_name_set(struct k_thread *thread, const char *value)
{
#ifdef CONFIG_THREAD_NAME
if (thread == NULL) {
thread = _current;
}
strncpy(thread->name, value, CONFIG_THREAD_MAX_NAME_LEN);
thread->name[CONFIG_THREAD_MAX_NAME_LEN - 1] = '\0';
SYS_PORT_TRACING_OBJ_FUNC(k_thread, name_set, thread, 0);
return 0;
#else
ARG_UNUSED(thread);
ARG_UNUSED(value);
SYS_PORT_TRACING_OBJ_FUNC(k_thread, name_set, thread, -ENOSYS);
return -ENOSYS;
#endif /* CONFIG_THREAD_NAME */
}
#ifdef CONFIG_USERSPACE
static inline int z_vrfy_k_thread_name_set(struct k_thread *thread, const char *str)
{
#ifdef CONFIG_THREAD_NAME
char name[CONFIG_THREAD_MAX_NAME_LEN];
if (thread != NULL) {
if (Z_SYSCALL_OBJ(thread, K_OBJ_THREAD) != 0) {
return -EINVAL;
}
}
/* In theory we could copy directly into thread->name, but
* the current z_vrfy / z_impl split does not provide a
* means of doing so.
*/
if (z_user_string_copy(name, (char *)str, sizeof(name)) != 0) {
return -EFAULT;
}
return z_impl_k_thread_name_set(thread, name);
#else
return -ENOSYS;
#endif /* CONFIG_THREAD_NAME */
}
#include <syscalls/k_thread_name_set_mrsh.c>
#endif /* CONFIG_USERSPACE */
const char *k_thread_name_get(struct k_thread *thread)
{
#ifdef CONFIG_THREAD_NAME
return (const char *)thread->name;
#else
ARG_UNUSED(thread);
return NULL;
#endif /* CONFIG_THREAD_NAME */
}
int z_impl_k_thread_name_copy(k_tid_t thread, char *buf, size_t size)
{
#ifdef CONFIG_THREAD_NAME
strncpy(buf, thread->name, size);
return 0;
#else
ARG_UNUSED(thread);
ARG_UNUSED(buf);
ARG_UNUSED(size);
return -ENOSYS;
#endif /* CONFIG_THREAD_NAME */
}
const char *k_thread_state_str(k_tid_t thread_id)
{
switch (thread_id->base.thread_state) {
case 0:
return "";
case _THREAD_DUMMY:
return "dummy";
case _THREAD_PENDING:
return "pending";
case _THREAD_PRESTART:
return "prestart";
case _THREAD_DEAD:
return "dead";
case _THREAD_SUSPENDED:
return "suspended";
case _THREAD_ABORTING:
return "aborting";
case _THREAD_QUEUED:
return "queued";
default:
/* Add a break, some day when another case gets added at the end,
* this bit of defensive programming will be useful
*/
break;
}
return "unknown";
}
#ifdef CONFIG_USERSPACE
static inline int z_vrfy_k_thread_name_copy(k_tid_t thread,
char *buf, size_t size)
{
#ifdef CONFIG_THREAD_NAME
size_t len;
struct z_object *ko = z_object_find(thread);
/* Special case: we allow reading the names of initialized threads
* even if we don't have permission on them
*/
if (thread == NULL || ko->type != K_OBJ_THREAD ||
(ko->flags & K_OBJ_FLAG_INITIALIZED) == 0) {
return -EINVAL;
}
if (Z_SYSCALL_MEMORY_WRITE(buf, size) != 0) {
return -EFAULT;
}
len = strlen(thread->name);
if (len + 1 > size) {
return -ENOSPC;
}
return z_user_to_copy((void *)buf, thread->name, len + 1);
#else
ARG_UNUSED(thread);
ARG_UNUSED(buf);
ARG_UNUSED(size);
return -ENOSYS;
#endif /* CONFIG_THREAD_NAME */
}
#include <syscalls/k_thread_name_copy_mrsh.c>
#endif /* CONFIG_USERSPACE */
#ifdef CONFIG_MULTITHREADING
#ifdef CONFIG_STACK_SENTINEL
/* Check that the stack sentinel is still present
*
* The stack sentinel feature writes a magic value to the lowest 4 bytes of
* the thread's stack when the thread is initialized. This value gets checked
* in a few places:
*
* 1) In k_yield() if the current thread is not swapped out
* 2) After servicing a non-nested interrupt
* 3) In z_swap(), check the sentinel in the outgoing thread
*
* Item 2 requires support in arch/ code.
*
* If the check fails, the thread will be terminated appropriately through
* the system fatal error handler.
*/
void z_check_stack_sentinel(void)
{
uint32_t *stack;
if ((_current->base.thread_state & _THREAD_DUMMY) != 0) {
return;
}
stack = (uint32_t *)_current->stack_info.start;
if (*stack != STACK_SENTINEL) {
/* Restore it so further checks don't trigger this same error */
*stack = STACK_SENTINEL;
z_except_reason(K_ERR_STACK_CHK_FAIL);
}
}
#endif /* CONFIG_STACK_SENTINEL */
void z_impl_k_thread_start(struct k_thread *thread)
{
SYS_PORT_TRACING_OBJ_FUNC(k_thread, start, thread);
z_sched_start(thread);
}
#ifdef CONFIG_USERSPACE
static inline void z_vrfy_k_thread_start(struct k_thread *thread)
{
Z_OOPS(Z_SYSCALL_OBJ(thread, K_OBJ_THREAD));
return z_impl_k_thread_start(thread);
}
#include <syscalls/k_thread_start_mrsh.c>
#endif
#endif
#ifdef CONFIG_MULTITHREADING
static void schedule_new_thread(struct k_thread *thread, k_timeout_t delay)
{
#ifdef CONFIG_SYS_CLOCK_EXISTS
if (K_TIMEOUT_EQ(delay, K_NO_WAIT)) {
k_thread_start(thread);
} else {
z_add_thread_timeout(thread, delay);
}
#else
ARG_UNUSED(delay);
k_thread_start(thread);
#endif
}
#endif
#if CONFIG_STACK_POINTER_RANDOM
int z_stack_adjust_initialized;
static size_t random_offset(size_t stack_size)
{
size_t random_val;
if (!z_stack_adjust_initialized) {
z_early_boot_rand_get((uint8_t *)&random_val, sizeof(random_val));
} else {
sys_rand_get((uint8_t *)&random_val, sizeof(random_val));
}
/* Don't need to worry about alignment of the size here,
* arch_new_thread() is required to do it.
*
* FIXME: Not the best way to get a random number in a range.
* See #6493
*/
const size_t fuzz = random_val % CONFIG_STACK_POINTER_RANDOM;
if (unlikely(fuzz * 2 > stack_size)) {
return 0;
}
return fuzz;
}
#if defined(CONFIG_STACK_GROWS_UP)
/* This is so rare not bothering for now */
#error "Stack pointer randomization not implemented for upward growing stacks"
#endif /* CONFIG_STACK_GROWS_UP */
#endif /* CONFIG_STACK_POINTER_RANDOM */
static char *setup_thread_stack(struct k_thread *new_thread,
k_thread_stack_t *stack, size_t stack_size)
{
size_t stack_obj_size, stack_buf_size;
char *stack_ptr, *stack_buf_start;
size_t delta = 0;
#ifdef CONFIG_USERSPACE
if (z_stack_is_user_capable(stack)) {
stack_obj_size = Z_THREAD_STACK_SIZE_ADJUST(stack_size);
stack_buf_start = Z_THREAD_STACK_BUFFER(stack);
stack_buf_size = stack_obj_size - K_THREAD_STACK_RESERVED;
} else
#endif
{
/* Object cannot host a user mode thread */
stack_obj_size = Z_KERNEL_STACK_SIZE_ADJUST(stack_size);
stack_buf_start = Z_KERNEL_STACK_BUFFER(stack);
stack_buf_size = stack_obj_size - K_KERNEL_STACK_RESERVED;
}
/* Initial stack pointer at the high end of the stack object, may
* be reduced later in this function by TLS or random offset
*/
stack_ptr = (char *)stack + stack_obj_size;
LOG_DBG("stack %p for thread %p: obj_size=%zu buf_start=%p "
" buf_size %zu stack_ptr=%p",
stack, new_thread, stack_obj_size, stack_buf_start,
stack_buf_size, stack_ptr);
#ifdef CONFIG_INIT_STACKS
memset(stack_buf_start, 0xaa, stack_buf_size);
#endif
#ifdef CONFIG_STACK_SENTINEL
/* Put the stack sentinel at the lowest 4 bytes of the stack area.
* We periodically check that it's still present and kill the thread
* if it isn't.
*/
*((uint32_t *)stack_buf_start) = STACK_SENTINEL;
#endif /* CONFIG_STACK_SENTINEL */
#ifdef CONFIG_THREAD_LOCAL_STORAGE
/* TLS is always last within the stack buffer */
delta += arch_tls_stack_setup(new_thread, stack_ptr);
#endif /* CONFIG_THREAD_LOCAL_STORAGE */
#ifdef CONFIG_THREAD_USERSPACE_LOCAL_DATA
size_t tls_size = sizeof(struct _thread_userspace_local_data);
/* reserve space on highest memory of stack buffer for local data */
delta += tls_size;
new_thread->userspace_local_data =
(struct _thread_userspace_local_data *)(stack_ptr - delta);
#endif
#if CONFIG_STACK_POINTER_RANDOM
delta += random_offset(stack_buf_size);
#endif
delta = ROUND_UP(delta, ARCH_STACK_PTR_ALIGN);
#ifdef CONFIG_THREAD_STACK_INFO
/* Initial values. Arches which implement MPU guards that "borrow"
* memory from the stack buffer (not tracked in K_THREAD_STACK_RESERVED)
* will need to appropriately update this.
*
* The bounds tracked here correspond to the area of the stack object
* that the thread can access, which includes TLS.
*/
new_thread->stack_info.start = (uintptr_t)stack_buf_start;
new_thread->stack_info.size = stack_buf_size;
new_thread->stack_info.delta = delta;
#endif
stack_ptr -= delta;
return stack_ptr;
}
/*
* The provided stack_size value is presumed to be either the result of
* K_THREAD_STACK_SIZEOF(stack), or the size value passed to the instance
* of K_THREAD_STACK_DEFINE() which defined 'stack'.
*/
char *z_setup_new_thread(struct k_thread *new_thread,
k_thread_stack_t *stack, size_t stack_size,
k_thread_entry_t entry,
void *p1, void *p2, void *p3,
int prio, uint32_t options, const char *name)
{
char *stack_ptr;
Z_ASSERT_VALID_PRIO(prio, entry);
#ifdef CONFIG_USERSPACE
__ASSERT((options & K_USER) == 0U || z_stack_is_user_capable(stack),
"user thread %p with kernel-only stack %p",
new_thread, stack);
z_object_init(new_thread);
z_object_init(stack);
new_thread->stack_obj = stack;
new_thread->syscall_frame = NULL;
/* Any given thread has access to itself */
k_object_access_grant(new_thread, new_thread);
#endif
z_waitq_init(&new_thread->join_queue);
/* Initialize various struct k_thread members */
z_init_thread_base(&new_thread->base, prio, _THREAD_PRESTART, options);
stack_ptr = setup_thread_stack(new_thread, stack, stack_size);
#ifdef CONFIG_KERNEL_COHERENCE
/* Check that the thread object is safe, but that the stack is
* still cached!
*/
__ASSERT_NO_MSG(arch_mem_coherent(new_thread));
__ASSERT_NO_MSG(!arch_mem_coherent(stack));
#endif
arch_new_thread(new_thread, stack, stack_ptr, entry, p1, p2, p3);
/* static threads overwrite it afterwards with real value */
new_thread->init_data = NULL;
#ifdef CONFIG_USE_SWITCH
/* switch_handle must be non-null except when inside z_swap()
* for synchronization reasons. Historically some notional
* USE_SWITCH architectures have actually ignored the field
*/
__ASSERT(new_thread->switch_handle != NULL,
"arch layer failed to initialize switch_handle");
#endif
#ifdef CONFIG_THREAD_CUSTOM_DATA
/* Initialize custom data field (value is opaque to kernel) */
new_thread->custom_data = NULL;
#endif
#ifdef CONFIG_THREAD_MONITOR
new_thread->entry.pEntry = entry;
new_thread->entry.parameter1 = p1;
new_thread->entry.parameter2 = p2;
new_thread->entry.parameter3 = p3;
k_spinlock_key_t key = k_spin_lock(&z_thread_monitor_lock);
new_thread->next_thread = _kernel.threads;
_kernel.threads = new_thread;
k_spin_unlock(&z_thread_monitor_lock, key);
#endif
#ifdef CONFIG_THREAD_NAME
if (name != NULL) {
strncpy(new_thread->name, name,
CONFIG_THREAD_MAX_NAME_LEN - 1);
/* Ensure NULL termination, truncate if longer */
new_thread->name[CONFIG_THREAD_MAX_NAME_LEN - 1] = '\0';
} else {
new_thread->name[0] = '\0';
}
#endif
#ifdef CONFIG_SCHED_CPU_MASK
if (IS_ENABLED(CONFIG_SCHED_CPU_MASK_PIN_ONLY)) {
new_thread->base.cpu_mask = 1; /* must specify only one cpu */
} else {
new_thread->base.cpu_mask = -1; /* allow all cpus */
}
#endif
#ifdef CONFIG_ARCH_HAS_CUSTOM_SWAP_TO_MAIN
/* _current may be null if the dummy thread is not used */
if (!_current) {
new_thread->resource_pool = NULL;
return stack_ptr;
}
#endif
#ifdef CONFIG_USERSPACE
z_mem_domain_init_thread(new_thread);
if ((options & K_INHERIT_PERMS) != 0U) {
z_thread_perms_inherit(_current, new_thread);
}
#endif
#ifdef CONFIG_SCHED_DEADLINE
new_thread->base.prio_deadline = 0;
#endif
new_thread->resource_pool = _current->resource_pool;
SYS_PORT_TRACING_OBJ_FUNC(k_thread, create, new_thread);
return stack_ptr;
}
#ifdef CONFIG_MULTITHREADING
k_tid_t z_impl_k_thread_create(struct k_thread *new_thread,
k_thread_stack_t *stack,
size_t stack_size, k_thread_entry_t entry,
void *p1, void *p2, void *p3,
int prio, uint32_t options, k_timeout_t delay)
{
__ASSERT(!arch_is_in_isr(), "Threads may not be created in ISRs");
z_setup_new_thread(new_thread, stack, stack_size, entry, p1, p2, p3,
prio, options, NULL);
if (!K_TIMEOUT_EQ(delay, K_FOREVER)) {
schedule_new_thread(new_thread, delay);
}
return new_thread;
}
#ifdef CONFIG_USERSPACE
bool z_stack_is_user_capable(k_thread_stack_t *stack)
{
return z_object_find(stack) != NULL;
}
k_tid_t z_vrfy_k_thread_create(struct k_thread *new_thread,
k_thread_stack_t *stack,
size_t stack_size, k_thread_entry_t entry,
void *p1, void *p2, void *p3,
int prio, uint32_t options, k_timeout_t delay)
{
size_t total_size, stack_obj_size;
struct z_object *stack_object;
/* The thread and stack objects *must* be in an uninitialized state */
Z_OOPS(Z_SYSCALL_OBJ_NEVER_INIT(new_thread, K_OBJ_THREAD));
/* No need to check z_stack_is_user_capable(), it won't be in the
* object table if it isn't
*/
stack_object = z_object_find(stack);
Z_OOPS(Z_SYSCALL_VERIFY_MSG(z_obj_validation_check(stack_object, stack,
K_OBJ_THREAD_STACK_ELEMENT,
_OBJ_INIT_FALSE) == 0,
"bad stack object"));
/* Verify that the stack size passed in is OK by computing the total
* size and comparing it with the size value in the object metadata
*/
Z_OOPS(Z_SYSCALL_VERIFY_MSG(!size_add_overflow(K_THREAD_STACK_RESERVED,
stack_size, &total_size),
"stack size overflow (%zu+%zu)",
stack_size,
K_THREAD_STACK_RESERVED));
/* Testing less-than-or-equal since additional room may have been
* allocated for alignment constraints
*/
#ifdef CONFIG_GEN_PRIV_STACKS
stack_obj_size = stack_object->data.stack_data->size;
#else
stack_obj_size = stack_object->data.stack_size;
#endif
Z_OOPS(Z_SYSCALL_VERIFY_MSG(total_size <= stack_obj_size,
"stack size %zu is too big, max is %zu",
total_size, stack_obj_size));
/* User threads may only create other user threads and they can't
* be marked as essential
*/
Z_OOPS(Z_SYSCALL_VERIFY(options & K_USER));
Z_OOPS(Z_SYSCALL_VERIFY(!(options & K_ESSENTIAL)));
/* Check validity of prio argument; must be the same or worse priority
* than the caller
*/
Z_OOPS(Z_SYSCALL_VERIFY(_is_valid_prio(prio, NULL)));
Z_OOPS(Z_SYSCALL_VERIFY(z_is_prio_lower_or_equal(prio,
_current->base.prio)));
z_setup_new_thread(new_thread, stack, stack_size,
entry, p1, p2, p3, prio, options, NULL);
if (!K_TIMEOUT_EQ(delay, K_FOREVER)) {
schedule_new_thread(new_thread, delay);
}
return new_thread;
}
#include <syscalls/k_thread_create_mrsh.c>
#endif /* CONFIG_USERSPACE */
#endif /* CONFIG_MULTITHREADING */
#ifdef CONFIG_MULTITHREADING
#ifdef CONFIG_USERSPACE
static void grant_static_access(void)
{
STRUCT_SECTION_FOREACH(z_object_assignment, pos) {
for (int i = 0; pos->objects[i] != NULL; i++) {
k_object_access_grant(pos->objects[i],
pos->thread);
}
}
}
#endif /* CONFIG_USERSPACE */
void z_init_static_threads(void)
{
_FOREACH_STATIC_THREAD(thread_data) {
z_setup_new_thread(
thread_data->init_thread,
thread_data->init_stack,
thread_data->init_stack_size,
thread_data->init_entry,
thread_data->init_p1,
thread_data->init_p2,
thread_data->init_p3,
thread_data->init_prio,
thread_data->init_options,
thread_data->init_name);
thread_data->init_thread->init_data = thread_data;
}
#ifdef CONFIG_USERSPACE
grant_static_access();
#endif
/*
* Non-legacy static threads may be started immediately or
* after a previously specified delay. Even though the
* scheduler is locked, ticks can still be delivered and
* processed. Take a sched lock to prevent them from running
* until they are all started.
*
* Note that static threads defined using the legacy API have a
* delay of K_FOREVER.
*/
k_sched_lock();
_FOREACH_STATIC_THREAD(thread_data) {
if (thread_data->init_delay != K_TICKS_FOREVER) {
schedule_new_thread(thread_data->init_thread,
K_MSEC(thread_data->init_delay));
}
}
k_sched_unlock();
}
#endif
void z_init_thread_base(struct _thread_base *thread_base, int priority,
uint32_t initial_state, unsigned int options)
{
/* k_q_node is initialized upon first insertion in a list */
thread_base->pended_on = NULL;
thread_base->user_options = (uint8_t)options;
thread_base->thread_state = (uint8_t)initial_state;
thread_base->prio = priority;
thread_base->sched_locked = 0U;
#ifdef CONFIG_SMP
thread_base->is_idle = 0;
#endif
/* swap_data does not need to be initialized */
z_init_thread_timeout(thread_base);
}
FUNC_NORETURN void k_thread_user_mode_enter(k_thread_entry_t entry,
void *p1, void *p2, void *p3)
{
SYS_PORT_TRACING_FUNC(k_thread, user_mode_enter);
_current->base.user_options |= K_USER;
z_thread_essential_clear();
#ifdef CONFIG_THREAD_MONITOR
_current->entry.pEntry = entry;
_current->entry.parameter1 = p1;
_current->entry.parameter2 = p2;
_current->entry.parameter3 = p3;
#endif
#ifdef CONFIG_USERSPACE
__ASSERT(z_stack_is_user_capable(_current->stack_obj),
"dropping to user mode with kernel-only stack object");
#ifdef CONFIG_THREAD_USERSPACE_LOCAL_DATA
memset(_current->userspace_local_data, 0,
sizeof(struct _thread_userspace_local_data));
#endif
#ifdef CONFIG_THREAD_LOCAL_STORAGE
arch_tls_stack_setup(_current,
(char *)(_current->stack_info.start +
_current->stack_info.size));
#endif
arch_user_mode_enter(entry, p1, p2, p3);
#else
/* XXX In this case we do not reset the stack */
z_thread_entry(entry, p1, p2, p3);
#endif
}
/* These spinlock assertion predicates are defined here because having
* them in spinlock.h is a giant header ordering headache.
*/
#ifdef CONFIG_SPIN_VALIDATE
bool z_spin_lock_valid(struct k_spinlock *l)
{
uintptr_t thread_cpu = l->thread_cpu;
if (thread_cpu != 0U) {
if ((thread_cpu & 3U) == _current_cpu->id) {
return false;
}
}
return true;
}
bool z_spin_unlock_valid(struct k_spinlock *l)
{
if (l->thread_cpu != (_current_cpu->id | (uintptr_t)_current)) {
return false;
}
l->thread_cpu = 0;
return true;
}
void z_spin_lock_set_owner(struct k_spinlock *l)
{
l->thread_cpu = _current_cpu->id | (uintptr_t)_current;
}
#ifdef CONFIG_KERNEL_COHERENCE
bool z_spin_lock_mem_coherent(struct k_spinlock *l)
{
return arch_mem_coherent((void *)l);
}
#endif /* CONFIG_KERNEL_COHERENCE */
#endif /* CONFIG_SPIN_VALIDATE */
int z_impl_k_float_disable(struct k_thread *thread)
{
#if defined(CONFIG_FPU) && defined(CONFIG_FPU_SHARING)
return arch_float_disable(thread);
#else
return -ENOTSUP;
#endif /* CONFIG_FPU && CONFIG_FPU_SHARING */
}
int z_impl_k_float_enable(struct k_thread *thread, unsigned int options)
{
#if defined(CONFIG_FPU) && defined(CONFIG_FPU_SHARING)
return arch_float_enable(thread, options);
#else
return -ENOTSUP;
#endif /* CONFIG_FPU && CONFIG_FPU_SHARING */
}
#ifdef CONFIG_USERSPACE
static inline int z_vrfy_k_float_disable(struct k_thread *thread)
{
Z_OOPS(Z_SYSCALL_OBJ(thread, K_OBJ_THREAD));
return z_impl_k_float_disable(thread);
}
#include <syscalls/k_float_disable_mrsh.c>
#endif /* CONFIG_USERSPACE */
#ifdef CONFIG_IRQ_OFFLOAD
/* Make offload_sem visible outside under testing, in order to release
* it outside when error happened.
*/
K_SEM_DEFINE(offload_sem, 1, 1);
void irq_offload(irq_offload_routine_t routine, const void *parameter)
{
k_sem_take(&offload_sem, K_FOREVER);
arch_irq_offload(routine, parameter);
k_sem_give(&offload_sem);
}
#endif
#if defined(CONFIG_INIT_STACKS) && defined(CONFIG_THREAD_STACK_INFO)
#ifdef CONFIG_STACK_GROWS_UP
#error "Unsupported configuration for stack analysis"
#endif
int z_impl_k_thread_stack_space_get(const struct k_thread *thread,
size_t *unused_ptr)
{
const uint8_t *start = (uint8_t *)thread->stack_info.start;
size_t size = thread->stack_info.size;
size_t unused = 0;
const uint8_t *checked_stack = start;
/* Take the address of any local variable as a shallow bound for the
* stack pointer. Addresses above it are guaranteed to be
* accessible.
*/
const uint8_t *stack_pointer = (const uint8_t *)&start;
/* If we are currently running on the stack being analyzed, some
* memory management hardware will generate an exception if we
* read unused stack memory.
*
* This never happens when invoked from user mode, as user mode
* will always run this function on the privilege elevation stack.
*/
if ((stack_pointer > start) && (stack_pointer <= (start + size)) &&
IS_ENABLED(CONFIG_NO_UNUSED_STACK_INSPECTION)) {
/* TODO: We could add an arch_ API call to temporarily
* disable the stack checking in the CPU, but this would
* need to be properly managed wrt context switches/interrupts
*/
return -ENOTSUP;
}
if (IS_ENABLED(CONFIG_STACK_SENTINEL)) {
/* First 4 bytes of the stack buffer reserved for the
* sentinel value, it won't be 0xAAAAAAAA for thread
* stacks.
*
* FIXME: thread->stack_info.start ought to reflect
* this!
*/
checked_stack += 4;
size -= 4;
}
for (size_t i = 0; i < size; i++) {
if ((checked_stack[i]) == 0xaaU) {
unused++;
} else {
break;
}
}
*unused_ptr = unused;
return 0;
}
#ifdef CONFIG_USERSPACE
int z_vrfy_k_thread_stack_space_get(const struct k_thread *thread,
size_t *unused_ptr)
{
size_t unused;
int ret;
ret = Z_SYSCALL_OBJ(thread, K_OBJ_THREAD);
CHECKIF(ret != 0) {
return ret;
}
ret = z_impl_k_thread_stack_space_get(thread, &unused);
CHECKIF(ret != 0) {
return ret;
}
ret = z_user_to_copy(unused_ptr, &unused, sizeof(size_t));
CHECKIF(ret != 0) {
return ret;
}
return 0;
}
#include <syscalls/k_thread_stack_space_get_mrsh.c>
#endif /* CONFIG_USERSPACE */
#endif /* CONFIG_INIT_STACKS && CONFIG_THREAD_STACK_INFO */
#ifdef CONFIG_USERSPACE
static inline k_ticks_t z_vrfy_k_thread_timeout_remaining_ticks(
const struct k_thread *t)
{
Z_OOPS(Z_SYSCALL_OBJ(t, K_OBJ_THREAD));
return z_impl_k_thread_timeout_remaining_ticks(t);
}
#include <syscalls/k_thread_timeout_remaining_ticks_mrsh.c>
static inline k_ticks_t z_vrfy_k_thread_timeout_expires_ticks(
const struct k_thread *t)
{
Z_OOPS(Z_SYSCALL_OBJ(t, K_OBJ_THREAD));
return z_impl_k_thread_timeout_expires_ticks(t);
}
#include <syscalls/k_thread_timeout_expires_ticks_mrsh.c>
#endif
#ifdef CONFIG_INSTRUMENT_THREAD_SWITCHING
void z_thread_mark_switched_in(void)
{
#if defined(CONFIG_SCHED_THREAD_USAGE) && !defined(CONFIG_USE_SWITCH)
z_sched_usage_start(_current);
#endif
#ifdef CONFIG_TRACING
SYS_PORT_TRACING_FUNC(k_thread, switched_in);
#endif
}
void z_thread_mark_switched_out(void)
{
#if defined(CONFIG_SCHED_THREAD_USAGE) && !defined(CONFIG_USE_SWITCH)
z_sched_usage_stop();
#endif
#ifdef CONFIG_TRACING
SYS_PORT_TRACING_FUNC(k_thread, switched_out);
#endif
}
#endif /* CONFIG_INSTRUMENT_THREAD_SWITCHING */
int k_thread_runtime_stats_get(k_tid_t thread,
k_thread_runtime_stats_t *stats)
{
if ((thread == NULL) || (stats == NULL)) {
return -EINVAL;
}
*stats = (k_thread_runtime_stats_t) {};
#ifdef CONFIG_SCHED_THREAD_USAGE
stats->execution_cycles = z_sched_thread_usage(thread);
#endif
return 0;
}
int k_thread_runtime_stats_all_get(k_thread_runtime_stats_t *stats)
{
if (stats == NULL) {
return -EINVAL;
}
*stats = (k_thread_runtime_stats_t) {};
#ifdef CONFIG_SCHED_THREAD_USAGE_ALL
stats->execution_cycles = (_kernel.all_thread_usage
+ _kernel.idle_thread_usage);
#endif
return 0;
}
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