/* * 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 #include #include /* * 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 j_do_fork(unsigned long clone_flags, unsigned long stack_start, unsigned long stack_size, int __user *parent_tidptr, int __user *child_tidptr, unsigned long tls) { pr_info("jprobe: clone_flags = 0x%lx, stack_start = 0x%lx " "stack_size = 0x%lx\n", clone_flags, stack_start, stack_size); /* Always end with a call to jprobe_return(). */ jprobe_return(); return 0; } static struct jprobe my_jprobe = { .entry = j_do_fork, .kp = { .symbol_name = "_do_fork", }, }; static int __init jprobe_init(void) { int ret; ret = register_jprobe(&my_jprobe); if (ret < 0) { pr_err("register_jprobe failed, returned %d\n", ret); return -1; } pr_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); pr_info("jprobe at %p unregistered\n", my_jprobe.kp.addr); } module_init(jprobe_init) module_exit(jprobe_exit) MODULE_LICENSE("GPL"); logtree commit diff

path: root/include/xen/interface/io

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