diff options
Diffstat (limited to 'samples/kprobes/jprobe_example.c')
| -rw-r--r-- | samples/kprobes/jprobe_example.c | 68 |
1 files changed, 0 insertions, 68 deletions
diff --git a/samples/kprobes/jprobe_example.c b/samples/kprobes/jprobe_example.c deleted file mode 100644 index b7541355b92b..000000000000 --- a/samples/kprobes/jprobe_example.c +++ /dev/null @@ -1,68 +0,0 @@ -/* - * Here's a sample kernel module showing the use of jprobes to dump - * the arguments of do_fork(). - * - * For more information on theory of operation of jprobes, see - * Documentation/kprobes.txt - * - * Build and insert the kernel module as done in the kprobe example. - * You will see the trace data in /var/log/messages and on the - * console whenever do_fork() is invoked to create a new process. - * (Some messages may be suppressed if syslogd is configured to - * eliminate duplicate messages.) - */ - -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/kprobes.h> - -/* - * Jumper probe for do_fork. - * Mirror principle enables access to arguments of the probed routine - * from the probe handler. - */ - -/* Proxy routine having the same arguments as actual do_fork() routine */ -static long jdo_fork(unsigned long clone_flags, unsigned long stack_start, - struct pt_regs *regs, unsigned long stack_size, - int __user *parent_tidptr, int __user *child_tidptr) -{ - printk(KERN_INFO "jprobe: clone_flags = 0x%lx, stack_size = 0x%lx," - " regs = 0x%p\n", - clone_flags, stack_size, regs); - - /* Always end with a call to jprobe_return(). */ - jprobe_return(); - return 0; -} - -static struct jprobe my_jprobe = { - .entry = jdo_fork, - .kp = { - .symbol_name = "do_fork", - }, -}; - -static int __init jprobe_init(void) -{ - int ret; - - ret = register_jprobe(&my_jprobe); - if (ret < 0) { - printk(KERN_INFO "register_jprobe failed, returned %d\n", ret); - return -1; - } - printk(KERN_INFO "Planted jprobe at %p, handler addr %p\n", - my_jprobe.kp.addr, my_jprobe.entry); - return 0; -} - -static void __exit jprobe_exit(void) -{ - unregister_jprobe(&my_jprobe); - printk(KERN_INFO "jprobe at %p unregistered\n", my_jprobe.kp.addr); -} - -module_init(jprobe_init) -module_exit(jprobe_exit) -MODULE_LICENSE("GPL"); |
