945af95f42
All system calls made from userspace which involve pointers to kernel objects (including device drivers) will need to have those pointers validated; userspace should never be able to crash the kernel by passing it garbage. The actual validation with _k_object_validate() will be in the system call receiver code, which doesn't exist yet. - CONFIG_USERSPACE introduced. We are somewhat far away from having an end-to-end implementation, but at least need a Kconfig symbol to guard the incoming code with. Formal documentation doesn't exist yet either, but will appear later down the road once the implementation is mostly finalized. - In the memory region for RAM, the data section has been moved last, past bss and noinit. This ensures that inserting generated tables with addresses of kernel objects does not change the addresses of those objects (which would make the table invalid) - The DWARF debug information in the generated ELF binary is parsed to fetch the locations of all kernel objects and pass this to gperf to create a perfect hash table of their memory addresses. - The generated gperf code doesn't know that we are exclusively working with memory addresses and uses memory inefficently. A post-processing script process_gperf.py adjusts the generated code before it is compiled to work with pointer values directly and not strings containing them. - _k_object_init() calls inserted into the init functions for the set of kernel object types we are going to support so far Issue: ZEP-2187 Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
97 lines
2.1 KiB
C
97 lines
2.1 KiB
C
/*
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* Copyright (c) 2016 Wind River Systems, Inc.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @file
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* @brief kernel alerts.
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*/
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#include <kernel.h>
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#include <kernel_structs.h>
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#include <debug/object_tracing_common.h>
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#include <atomic.h>
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#include <init.h>
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#include <toolchain.h>
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#include <linker/sections.h>
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extern struct k_alert _k_alert_list_start[];
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extern struct k_alert _k_alert_list_end[];
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struct k_alert *_trace_list_k_alert;
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#ifdef CONFIG_OBJECT_TRACING
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/*
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* Complete initialization of statically defined alerts.
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*/
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static int init_alert_module(struct device *dev)
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{
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ARG_UNUSED(dev);
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struct k_alert *alert;
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for (alert = _k_alert_list_start; alert < _k_alert_list_end; alert++) {
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SYS_TRACING_OBJ_INIT(k_alert, alert);
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}
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return 0;
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}
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SYS_INIT(init_alert_module, PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_OBJECTS);
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#endif /* CONFIG_OBJECT_TRACING */
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void _alert_deliver(struct k_work *work)
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{
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struct k_alert *alert = CONTAINER_OF(work, struct k_alert, work_item);
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while (1) {
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if ((alert->handler)(alert) == 0) {
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/* do nothing -- handler has processed the alert */
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} else {
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/* pend the alert */
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k_sem_give(&alert->sem);
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}
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if (atomic_dec(&alert->send_count) == 1) {
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/* have finished delivering alerts */
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break;
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}
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}
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}
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void k_alert_init(struct k_alert *alert, k_alert_handler_t handler,
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unsigned int max_num_pending_alerts)
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{
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alert->handler = handler;
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alert->send_count = ATOMIC_INIT(0);
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alert->work_item = (struct k_work)_K_WORK_INITIALIZER(_alert_deliver);
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k_sem_init(&alert->sem, 0, max_num_pending_alerts);
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SYS_TRACING_OBJ_INIT(k_alert, alert);
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_k_object_init(alert);
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}
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void k_alert_send(struct k_alert *alert)
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{
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if (alert->handler == K_ALERT_IGNORE) {
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/* ignore the alert */
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} else if (alert->handler == K_ALERT_DEFAULT) {
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/* pend the alert */
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k_sem_give(&alert->sem);
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} else {
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/* deliver the alert */
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if (atomic_inc(&alert->send_count) == 0) {
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/* add alert's work item to system work queue */
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k_work_submit_to_queue(&k_sys_work_q,
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&alert->work_item);
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}
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}
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}
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int k_alert_recv(struct k_alert *alert, s32_t timeout)
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{
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return k_sem_take(&alert->sem, timeout);
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}
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