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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"); |