https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: c500bee1c5b2f1d59b1081ac879d73268ab0ff17 authored by Linus Torvalds on 02 August 2021, 00:04:17 UTC
Linux 5.14-rc4
Linux 5.14-rc4
Tip revision: c500bee
ftrace-direct-modify.c
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/module.h>
#include <linux/kthread.h>
#include <linux/ftrace.h>
void my_direct_func1(void)
{
trace_printk("my direct func1\n");
}
void my_direct_func2(void)
{
trace_printk("my direct func2\n");
}
extern void my_tramp1(void *);
extern void my_tramp2(void *);
static unsigned long my_ip = (unsigned long)schedule;
asm (
" .pushsection .text, \"ax\", @progbits\n"
" .type my_tramp1, @function\n"
" .globl my_tramp1\n"
" my_tramp1:"
" pushq %rbp\n"
" movq %rsp, %rbp\n"
" call my_direct_func1\n"
" leave\n"
" .size my_tramp1, .-my_tramp1\n"
" ret\n"
" .type my_tramp2, @function\n"
" .globl my_tramp2\n"
" my_tramp2:"
" pushq %rbp\n"
" movq %rsp, %rbp\n"
" call my_direct_func2\n"
" leave\n"
" ret\n"
" .size my_tramp2, .-my_tramp2\n"
" .popsection\n"
);
static unsigned long my_tramp = (unsigned long)my_tramp1;
static unsigned long tramps[2] = {
(unsigned long)my_tramp1,
(unsigned long)my_tramp2,
};
static int simple_thread(void *arg)
{
static int t;
int ret = 0;
while (!kthread_should_stop()) {
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(2 * HZ);
if (ret)
continue;
t ^= 1;
ret = modify_ftrace_direct(my_ip, my_tramp, tramps[t]);
if (!ret)
my_tramp = tramps[t];
WARN_ON_ONCE(ret);
}
return 0;
}
static struct task_struct *simple_tsk;
static int __init ftrace_direct_init(void)
{
int ret;
ret = register_ftrace_direct(my_ip, my_tramp);
if (!ret)
simple_tsk = kthread_run(simple_thread, NULL, "event-sample-fn");
return ret;
}
static void __exit ftrace_direct_exit(void)
{
kthread_stop(simple_tsk);
unregister_ftrace_direct(my_ip, my_tramp);
}
module_init(ftrace_direct_init);
module_exit(ftrace_direct_exit);
MODULE_AUTHOR("Steven Rostedt");
MODULE_DESCRIPTION("Example use case of using modify_ftrace_direct()");
MODULE_LICENSE("GPL");