+++ /dev/null
-/*
- * (C) Copyright 2009-2011 -
- * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * LTTng kprobes integration module.
- *
- * Dual LGPL v2.1/GPL v2 license.
- */
-
-#include <linux/module.h>
-#include <linux/kprobes.h>
-#include <linux/slab.h>
-#include "../ltt-events.h"
-#include "../wrapper/ringbuffer/frontend_types.h"
-#include "../ltt-tracer.h"
-
-static
-int lttng_kprobes_handler_pre(struct kprobe *p, struct pt_regs *regs)
-{
- struct ltt_event *event =
- container_of(p, struct ltt_event, u.kprobe.kp);
- struct ltt_channel *chan = event->chan;
- struct lib_ring_buffer_ctx ctx;
- int ret;
- unsigned long data = (unsigned long) p->addr;
-
- if (!ACCESS_ONCE(chan->session->active))
- return 0;
- lib_ring_buffer_ctx_init(&ctx, chan->chan, NULL, sizeof(data),
- ltt_alignof(data), -1);
- ret = chan->ops->event_reserve(&ctx);
- if (ret < 0)
- return 0;
- lib_ring_buffer_align_ctx(&ctx, ltt_alignof(data));
- chan->ops->event_write(&ctx, &data, sizeof(data));
- chan->ops->event_commit(&ctx);
- return 0;
-}
-
-/*
- * Create event description
- */
-static
-int lttng_create_kprobe_event(const char *name, struct ltt_event *event)
-{
- struct lttng_event_field *field;
- int ret;
-
- event->desc = kzalloc(sizeof(*event->desc), GFP_KERNEL);
- if (!event->desc)
- return -ENOMEM;
- event->desc->name = kstrdup(name, GFP_KERNEL);
- if (!event->desc->name) {
- ret = -ENOMEM;
- goto error_str;
- }
- event->desc->nr_fields = 1;
- event->desc->fields = field =
- kzalloc(1 * sizeof(struct lttng_event_field), GFP_KERNEL);
- field->name = "ip";
- field->type.atype = atype_integer;
- field->type.u.basic.integer.size = sizeof(unsigned long);
- field->type.u.basic.integer.alignment = ltt_alignof(unsigned long);
- field->type.u.basic.integer.signedness = 0;
- field->type.u.basic.integer.reverse_byte_order = 0;
-
- return 0;
-
-error_str:
- kfree(event->desc);
- return ret;
-}
-
-int lttng_kprobes_register(const char *name,
- const char *symbol_name,
- uint64_t offset,
- uint64_t addr,
- struct ltt_event *event)
-{
- int ret;
-
- ret = lttng_create_kprobe_event(name, event);
- if (ret)
- goto error;
- memset(&event->u.kprobe.kp, 0, sizeof(event->u.kprobe.kp));
- event->u.kprobe.kp.pre_handler = lttng_kprobes_handler_pre;
- event->u.kprobe.symbol_name =
- kzalloc(LTTNG_KPROBE_SYM_NAME_LEN * sizeof(char),
- GFP_KERNEL);
- if (!event->u.kprobe.symbol_name) {
- ret = -ENOMEM;
- goto name_error;
- }
- memcpy(event->u.kprobe.symbol_name, symbol_name,
- LTTNG_KPROBE_SYM_NAME_LEN * sizeof(char));
- event->u.kprobe.kp.symbol_name =
- event->u.kprobe.symbol_name;
- event->u.kprobe.kp.offset = offset;
- event->u.kprobe.kp.addr = (void *) addr;
- ret = register_kprobe(&event->u.kprobe.kp);
- if (ret)
- goto register_error;
- return 0;
-
-register_error:
- kfree(event->u.kprobe.symbol_name);
-name_error:
- kfree(event->desc->name);
- kfree(event->desc);
-error:
- return ret;
-}
-EXPORT_SYMBOL_GPL(lttng_kprobes_register);
-
-void lttng_kprobes_unregister(struct ltt_event *event)
-{
- unregister_kprobe(&event->u.kprobe.kp);
- kfree(event->u.kprobe.symbol_name);
- kfree(event->desc->name);
- kfree(event->desc);
-}
-EXPORT_SYMBOL_GPL(lttng_kprobes_unregister);
-
-MODULE_LICENSE("GPL and additional rights");
-MODULE_AUTHOR("Mathieu Desnoyers");
-MODULE_DESCRIPTION("Linux Trace Toolkit Kprobes Support");