forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
48 lines
1.0 KiB
48 lines
1.0 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
#include <linux/module.h> |
|
|
|
#include <linux/sched.h> /* for wake_up_process() */ |
|
#include <linux/ftrace.h> |
|
|
|
void my_direct_func(struct task_struct *p) |
|
{ |
|
trace_printk("waking up %s-%d\n", p->comm, p->pid); |
|
} |
|
|
|
extern void my_tramp(void *); |
|
|
|
asm ( |
|
" .pushsection .text, \"ax\", @progbits\n" |
|
" .type my_tramp, @function\n" |
|
" .globl my_tramp\n" |
|
" my_tramp:" |
|
" pushq %rbp\n" |
|
" movq %rsp, %rbp\n" |
|
" pushq %rdi\n" |
|
" call my_direct_func\n" |
|
" popq %rdi\n" |
|
" leave\n" |
|
" ret\n" |
|
" .size my_tramp, .-my_tramp\n" |
|
" .popsection\n" |
|
); |
|
|
|
|
|
static int __init ftrace_direct_init(void) |
|
{ |
|
return register_ftrace_direct((unsigned long)wake_up_process, |
|
(unsigned long)my_tramp); |
|
} |
|
|
|
static void __exit ftrace_direct_exit(void) |
|
{ |
|
unregister_ftrace_direct((unsigned long)wake_up_process, |
|
(unsigned long)my_tramp); |
|
} |
|
|
|
module_init(ftrace_direct_init); |
|
module_exit(ftrace_direct_exit); |
|
|
|
MODULE_AUTHOR("Steven Rostedt"); |
|
MODULE_DESCRIPTION("Example use case of using register_ftrace_direct()"); |
|
MODULE_LICENSE("GPL");
|
|
|