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https://github.com/torvalds/linux
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7a1d55b987
There's a lot of duplicated code between gcc and clang implementations, move it over to fs.c to simplify the code, there's no reason to believe that for small data like this one would not just implement the simple convert_to_gcda() function. Link: https://lkml.kernel.org/r/20210315235453.e3fbb86e99a0.I08a3ee6dbe47ea3e8024956083f162884a958e40@changeid Signed-off-by: Johannes Berg <johannes.berg@intel.com> Acked-by: Peter Oberparleiter <oberpar@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
139 lines
3.4 KiB
C
139 lines
3.4 KiB
C
// 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 <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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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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