forked from Qortal/Brooklyn
2a709f28fa
* 0day explit mitigation * Memory corruption prevention * Privilege escalation prevention * Buffer over flow prevention * File System corruption defense * Thread escape prevention This may very well be the most intensive inclusion to BrooklynR. This will not be part of an x86 suite nor it will be released as tool kit. The security core toolkit will remain part of kernel base.
163 lines
3.8 KiB
C
163 lines
3.8 KiB
C
/*
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* This code maintains a list of active profiling data structures.
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*
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* Copyright IBM Corp. 2009
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* Author(s): Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
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*
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* Uses gcc-internal data definitions.
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* Based on the gcov-kernel patch by:
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* Hubertus Franke <frankeh@us.ibm.com>
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* Nigel Hinds <nhinds@us.ibm.com>
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* Rajan Ravindran <rajancr@us.ibm.com>
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* Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
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* Paul Larson
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*/
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#define pr_fmt(fmt) "gcov: " fmt
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/sched.h>
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#include "gcov.h"
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static int gcov_events_enabled;
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static DEFINE_MUTEX(gcov_lock);
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/*
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* __gcov_init is called by gcc-generated constructor code for each object
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* file compiled with -fprofile-arcs.
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*/
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void __gcov_init(struct gcov_info *info)
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{
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static unsigned int gcov_version;
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mutex_lock(&gcov_lock);
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if (gcov_version == 0) {
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gcov_version = gcov_info_version(info);
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/*
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* Printing gcc's version magic may prove useful for debugging
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* incompatibility reports.
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*/
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pr_info("version magic: 0x%x\n", gcov_version);
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}
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/*
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* Add new profiling data structure to list and inform event
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* listener.
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*/
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gcov_info_link(info);
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if (gcov_events_enabled)
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gcov_event(GCOV_ADD, info);
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mutex_unlock(&gcov_lock);
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}
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EXPORT_SYMBOL(__gcov_init);
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/*
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* These functions may be referenced by gcc-generated profiling code but serve
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* no function for kernel profiling.
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*/
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void __gcov_flush(void)
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{
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/* Unused. */
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}
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EXPORT_SYMBOL(__gcov_flush);
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void __gcov_merge_add(gcov_type *counters, unsigned int n_counters)
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{
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/* Unused. */
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}
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EXPORT_SYMBOL(__gcov_merge_add);
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void __gcov_merge_single(gcov_type *counters, unsigned int n_counters)
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{
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/* Unused. */
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}
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EXPORT_SYMBOL(__gcov_merge_single);
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void __gcov_merge_delta(gcov_type *counters, unsigned int n_counters)
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{
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/* Unused. */
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}
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EXPORT_SYMBOL(__gcov_merge_delta);
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void __gcov_merge_ior(gcov_type *counters, unsigned int n_counters)
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{
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/* Unused. */
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}
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EXPORT_SYMBOL(__gcov_merge_ior);
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void __gcov_merge_time_profile(gcov_type *counters, unsigned int n_counters)
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{
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/* Unused. */
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}
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EXPORT_SYMBOL(__gcov_merge_time_profile);
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void __gcov_merge_icall_topn(gcov_type *counters, unsigned int n_counters)
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{
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/* Unused. */
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}
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EXPORT_SYMBOL(__gcov_merge_icall_topn);
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/**
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* gcov_enable_events - enable event reporting through gcov_event()
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*
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* Turn on reporting of profiling data load/unload-events through the
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* gcov_event() callback. Also replay all previous events once. This function
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* is needed because some events are potentially generated too early for the
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* callback implementation to handle them initially.
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*/
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void gcov_enable_events(void)
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{
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struct gcov_info *info = NULL;
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mutex_lock(&gcov_lock);
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gcov_events_enabled = 1;
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/* Perform event callback for previously registered entries. */
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while ((info = gcov_info_next(info))) {
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gcov_event(GCOV_ADD, info);
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cond_resched();
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}
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mutex_unlock(&gcov_lock);
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}
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#ifdef CONFIG_MODULES
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/* Update list and generate events when modules are unloaded. */
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static int gcov_module_notifier(struct notifier_block *nb, unsigned long event,
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void *data)
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{
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struct module *mod = data;
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struct gcov_info *info = NULL;
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struct gcov_info *prev = NULL;
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if (event != MODULE_STATE_GOING)
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return NOTIFY_OK;
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mutex_lock(&gcov_lock);
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/* Remove entries located in module from linked list. */
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while ((info = gcov_info_next(info))) {
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if (within_module((unsigned long)info, mod)) {
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gcov_info_unlink(prev, info);
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if (gcov_events_enabled)
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gcov_event(GCOV_REMOVE, info);
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} else
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prev = info;
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}
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mutex_unlock(&gcov_lock);
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return NOTIFY_OK;
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}
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static struct notifier_block gcov_nb = {
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.notifier_call = gcov_module_notifier,
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};
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static int __init gcov_init(void)
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{
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return register_module_notifier(&gcov_nb);
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}
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device_initcall(gcov_init);
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#endif /* CONFIG_MODULES */
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