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138 lines
3.4 KiB
138 lines
3.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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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 <[email protected]> |
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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 <[email protected]> |
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* Nigel Hinds <[email protected]> |
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* Rajan Ravindran <[email protected]> |
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* Peter Oberparleiter <[email protected]> |
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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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int gcov_events_enabled; |
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DEFINE_MUTEX(gcov_lock); |
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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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/** |
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* store_gcov_u32 - store 32 bit number in gcov format to buffer |
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* @buffer: target buffer or NULL |
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* @off: offset into the buffer |
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* @v: value to be stored |
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* |
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* Number format defined by gcc: numbers are recorded in the 32 bit |
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* unsigned binary form of the endianness of the machine generating the |
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* file. Returns the number of bytes stored. If @buffer is %NULL, doesn't |
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* store anything. |
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*/ |
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size_t store_gcov_u32(void *buffer, size_t off, u32 v) |
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{ |
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u32 *data; |
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if (buffer) { |
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data = buffer + off; |
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*data = v; |
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} |
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return sizeof(*data); |
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} |
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/** |
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* store_gcov_u64 - store 64 bit number in gcov format to buffer |
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* @buffer: target buffer or NULL |
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* @off: offset into the buffer |
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* @v: value to be stored |
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* |
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* Number format defined by gcc: numbers are recorded in the 32 bit |
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* unsigned binary form of the endianness of the machine generating the |
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* file. 64 bit numbers are stored as two 32 bit numbers, the low part |
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* first. Returns the number of bytes stored. If @buffer is %NULL, doesn't store |
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* anything. |
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*/ |
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size_t store_gcov_u64(void *buffer, size_t off, u64 v) |
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{ |
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u32 *data; |
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if (buffer) { |
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data = buffer + off; |
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data[0] = (v & 0xffffffffUL); |
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data[1] = (v >> 32); |
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} |
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return sizeof(*data) * 2; |
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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 (gcov_info_within_module(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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