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 * Copyright (c) 2010-2016 Wind River Systems, Inc.
 * SPDX-License-Identifier: Apache-2.0
 * @brief fixed-size stack object
#include <zephyr/sys/math_extras.h>
#include <zephyr/kernel.h>
#include <zephyr/kernel_structs.h>
#include <zephyr/toolchain.h>
#include <ksched.h>
#include <wait_q.h>
#include <zephyr/sys/check.h>
#include <zephyr/init.h>
#include <zephyr/internal/syscall_handler.h>
#include <kernel_internal.h>
#ifdef CONFIG_OBJ_CORE_STACK
static struct k_obj_type obj_type_stack;
#endif /* CONFIG_OBJ_CORE_STACK */
void k_stack_init(struct k_stack *stack, stack_data_t *buffer,
		  uint32_t num_entries)
	z_waitq_init(&stack->wait_q);
	stack->lock = (struct k_spinlock) {};
	stack->next = buffer;
	stack->base = buffer;
	stack->top = stack->base + num_entries;
	SYS_PORT_TRACING_OBJ_INIT(k_stack, stack);
	k_object_init(stack);
#ifdef CONFIG_OBJ_CORE_STACK
	k_obj_core_init_and_link(K_OBJ_CORE(stack), &obj_type_stack);
#endif /* CONFIG_OBJ_CORE_STACK */
int32_t z_impl_k_stack_alloc_init(struct k_stack *stack, uint32_t num_entries)
	void *buffer;
	int32_t ret;
	SYS_PORT_TRACING_OBJ_FUNC_ENTER(k_stack, alloc_init, stack);
	buffer = z_thread_malloc(num_entries * sizeof(stack_data_t));
	if (buffer != NULL) {
		k_stack_init(stack, buffer, num_entries);
		stack->flags = K_STACK_FLAG_ALLOC;
		ret = -ENOMEM;
	SYS_PORT_TRACING_OBJ_FUNC_EXIT(k_stack, alloc_init, stack, ret);
	return ret;
#ifdef CONFIG_USERSPACE
static inline int32_t z_vrfy_k_stack_alloc_init(struct k_stack *stack,
					      uint32_t num_entries)
	size_t total_size;
	K_OOPS(K_SYSCALL_OBJ_NEVER_INIT(stack, K_OBJ_STACK));
	K_OOPS(K_SYSCALL_VERIFY(num_entries > 0));
	K_OOPS(K_SYSCALL_VERIFY(!size_mul_overflow(num_entries, sizeof(stack_data_t),
					&total_size)));
	return z_impl_k_stack_alloc_init(stack, num_entries);
#include <zephyr/syscalls/k_stack_alloc_init_mrsh.c>
#endif /* CONFIG_USERSPACE */
int k_stack_cleanup(struct k_stack *stack)
	SYS_PORT_TRACING_OBJ_FUNC_ENTER(k_stack, cleanup, stack);
	CHECKIF(z_waitq_head(&stack->wait_q) != NULL) {
		SYS_PORT_TRACING_OBJ_FUNC_EXIT(k_stack, cleanup, stack, -EAGAIN);
		return -EAGAIN;
	if ((stack->flags & K_STACK_FLAG_ALLOC) != (uint8_t)0) {
		k_free(stack->base);
		stack->base = NULL;
		stack->flags &= ~K_STACK_FLAG_ALLOC;
	SYS_PORT_TRACING_OBJ_FUNC_EXIT(k_stack, cleanup, stack, 0);
int z_impl_k_stack_push(struct k_stack *stack, stack_data_t data)
	struct k_thread *first_pending_thread;
	int ret = 0;
	k_spinlock_key_t key = k_spin_lock(&stack->lock);
	SYS_PORT_TRACING_OBJ_FUNC_ENTER(k_stack, push, stack);
	CHECKIF(stack->next == stack->top) {
		ret = -ENOMEM;
		goto out;
	first_pending_thread = z_unpend_first_thread(&stack->wait_q);
	if (unlikely(first_pending_thread != NULL)) {
		z_thread_return_value_set_with_data(first_pending_thread,
						   0, (void *)data);
		z_ready_thread(first_pending_thread);
		z_reschedule(&stack->lock, key);
		goto end;
		*(stack->next) = data;
		stack->next++;
		goto out;
	k_spin_unlock(&stack->lock, key);
	SYS_PORT_TRACING_OBJ_FUNC_EXIT(k_stack, push, stack, ret);
	return ret;
#ifdef CONFIG_USERSPACE
static inline int z_vrfy_k_stack_push(struct k_stack *stack, stack_data_t data)
	K_OOPS(K_SYSCALL_OBJ(stack, K_OBJ_STACK));
	return z_impl_k_stack_push(stack, data);
#include <zephyr/syscalls/k_stack_push_mrsh.c>
#endif /* CONFIG_USERSPACE */
int z_impl_k_stack_pop(struct k_stack *stack, stack_data_t *data,
		       k_timeout_t timeout)
	k_spinlock_key_t key;
	int result;
	key = k_spin_lock(&stack->lock);
	SYS_PORT_TRACING_OBJ_FUNC_ENTER(k_stack, pop, stack, timeout);
	if (likely(stack->next > stack->base)) {
		stack->next--;
		*data = *(stack->next);
		k_spin_unlock(&stack->lock, key);
		SYS_PORT_TRACING_OBJ_FUNC_EXIT(k_stack, pop, stack, timeout, 0);
		return 0;
	SYS_PORT_TRACING_OBJ_FUNC_BLOCKING(k_stack, pop, stack, timeout);
	if (K_TIMEOUT_EQ(timeout, K_NO_WAIT)) {
		k_spin_unlock(&stack->lock, key);
		SYS_PORT_TRACING_OBJ_FUNC_EXIT(k_stack, pop, stack, timeout, -EBUSY);
		return -EBUSY;
	result = z_pend_curr(&stack->lock, key, &stack->wait_q, timeout);
	if (result == -EAGAIN) {
		SYS_PORT_TRACING_OBJ_FUNC_EXIT(k_stack, pop, stack, timeout, -EAGAIN);
		return -EAGAIN;
	*data = (stack_data_t)_current->base.swap_data;
	SYS_PORT_TRACING_OBJ_FUNC_EXIT(k_stack, pop, stack, timeout, 0);
#ifdef CONFIG_USERSPACE
static inline int z_vrfy_k_stack_pop(struct k_stack *stack,
				     stack_data_t *data, k_timeout_t timeout)
	K_OOPS(K_SYSCALL_OBJ(stack, K_OBJ_STACK));
	K_OOPS(K_SYSCALL_MEMORY_WRITE(data, sizeof(stack_data_t)));
	return z_impl_k_stack_pop(stack, data, timeout);
#include <zephyr/syscalls/k_stack_pop_mrsh.c>
#endif /* CONFIG_USERSPACE */
#ifdef CONFIG_OBJ_CORE_STACK
static int init_stack_obj_core_list(void)
	/* Initialize stack object type */
	z_obj_type_init(&obj_type_stack, K_OBJ_TYPE_STACK_ID,
			offsetof(struct k_stack, obj_core));
	/* Initialize and link statically defined stacks */
	STRUCT_SECTION_FOREACH(k_stack, stack) {
		k_obj_core_init_and_link(K_OBJ_CORE(stack), &obj_type_stack);
SYS_INIT(init_stack_obj_core_list, PRE_KERNEL_1,
	 CONFIG_KERNEL_INIT_PRIORITY_OBJECTS);
#endif /* CONFIG_OBJ_CORE_STACK */
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