projects / lttng-modules.git / blame
| Commit | Line | Data |
|---|---|---|
| d6d808f3 MD |
1 | /* |
| 2 | * (C) Copyright 2009-2011 - | |
| 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
| 4 | * | |
| 5 | * LTTng kprobes integration module. | |
| 6 | * | |
| 7 | * Dual LGPL v2.1/GPL v2 license. | |
| 8 | */ | |
| 9 | ||
| 10 | #include <linux/module.h> | |
| 11 | #include <linux/kprobes.h> | |
| 12 | #include "../ltt-events.h" | |
| 13 | #include "../wrapper/ringbuffer/frontend_types.h" | |
| 14 | #include "../ltt-tracer.h" | |
| 15 | ||
| 16 | void lttng_kprobes_handler_pre(struct kprobe *p, struct pt_regs *regs) | |
| 17 | { | |
| 18 | struct ltt_event *event = | |
| 19 | container_of(p, struct ltt_event, u.kprobe.kp); | |
| 20 | struct ltt_channel *chan = event->chan; | |
| 21 | struct lib_ring_buffer_ctx ctx; | |
| 22 | int ret; | |
| 23 | unsigned long data = (unsigned long) p->addr; | |
| 24 | ||
| 25 | if (!ACCESS_ONCE(chan->session->active)) | |
| 26 | return; | |
| 27 | lib_ring_buffer_ctx_init(&ctx, chan->chan, NULL, sizeof(data), | |
| 28 | ltt_alignof(data), -1); | |
| 29 | ret = chan->ops->event_reserve(&ctx); | |
| 30 | if (ret < 0) | |
| 31 | return; | |
| 32 | lib_ring_buffer_align_ctx(&ctx, ltt_alignof(data)); | |
| 33 | chan->ops->event_write(&ctx, &data, sizeof(data)); | |
| 34 | chan->ops->event_commit(&ctx); | |
| 35 | } | |
| 36 | EXPORT_SYMBOL_GPL(lttng_kprobes_handler_pre); | |
| 37 | ||
| 38 | MODULE_LICENSE("GPL and additional rights"); | |
| 39 | MODULE_AUTHOR("Mathieu Desnoyers"); | |
| 40 | MODULE_DESCRIPTION("Linux Trace Toolkit Kprobes Support"); |