#include <blacklist/kprobes.h>
static
-int lttng_kprobes_handler_pre(struct kprobe *p, struct pt_regs *regs)
+int lttng_kprobes_event_handler_pre(struct kprobe *p, struct pt_regs *regs)
{
struct lttng_event *event =
container_of(p, struct lttng_event, u.kprobe.kp);
int ret;
unsigned long data = (unsigned long) p->addr;
- if (unlikely(!READ_ONCE(chan->session->active)))
+ if (unlikely(!LTTNG_READ_ONCE(chan->session->active)))
return 0;
- if (unlikely(!READ_ONCE(chan->enabled)))
+ if (unlikely(!LTTNG_READ_ONCE(chan->enabled)))
return 0;
- if (unlikely(!READ_ONCE(event->enabled)))
+ if (unlikely(!LTTNG_READ_ONCE(event->enabled)))
return 0;
lib_ring_buffer_ctx_init(&ctx, chan->chan, <tng_probe_ctx, sizeof(data),
return 0;
}
+static
+int lttng_kprobes_event_notifier_handler_pre(struct kprobe *p, struct pt_regs *regs)
+{
+ struct lttng_event_notifier *event_notifier =
+ container_of(p, struct lttng_event_notifier, u.kprobe.kp);
+
+ if (unlikely(!READ_ONCE(event_notifier->enabled)))
+ return 0;
+
+ event_notifier->send_notification(event_notifier, NULL, NULL);
+
+ return 0;
+}
+
/*
* Create event description
*/
return ret;
}
-int lttng_kprobes_register(const char *name,
- const char *symbol_name,
+/*
+ * Create event_notifier description
+ */
+static
+int lttng_create_kprobe_event_notifier(const char *name, struct lttng_event_notifier *event_notifier)
+{
+ struct lttng_event_desc *desc;
+ int ret;
+
+ desc = kzalloc(sizeof(*event_notifier->desc), GFP_KERNEL);
+ if (!desc)
+ return -ENOMEM;
+ desc->name = kstrdup(name, GFP_KERNEL);
+ if (!desc->name) {
+ ret = -ENOMEM;
+ goto error_str;
+ }
+ desc->nr_fields = 0;
+
+ desc->owner = THIS_MODULE;
+ event_notifier->desc = desc;
+
+ return 0;
+
+error_str:
+ kfree(desc);
+ return ret;
+}
+
+static
+int _lttng_kprobes_register(const char *symbol_name,
uint64_t offset,
uint64_t addr,
- struct lttng_event *event)
+ struct lttng_kprobe *lttng_kp,
+ kprobe_pre_handler_t pre_handler)
{
int ret;
if (symbol_name[0] == '\0')
symbol_name = NULL;
- 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;
+ memset(<tng_kp->kp, 0, sizeof(lttng_kp->kp));
+ lttng_kp->kp.pre_handler = pre_handler;
+
if (symbol_name) {
- event->u.kprobe.symbol_name =
+ lttng_kp->symbol_name =
kzalloc(LTTNG_KERNEL_SYM_NAME_LEN * sizeof(char),
GFP_KERNEL);
- if (!event->u.kprobe.symbol_name) {
+ if (!lttng_kp->symbol_name) {
ret = -ENOMEM;
goto name_error;
}
- memcpy(event->u.kprobe.symbol_name, symbol_name,
+ memcpy(lttng_kp->symbol_name, symbol_name,
LTTNG_KERNEL_SYM_NAME_LEN * sizeof(char));
- event->u.kprobe.kp.symbol_name =
- event->u.kprobe.symbol_name;
+ lttng_kp->kp.symbol_name = lttng_kp->symbol_name;
}
- event->u.kprobe.kp.offset = offset;
- event->u.kprobe.kp.addr = (void *) (unsigned long) addr;
+
+ lttng_kp->kp.offset = offset;
+ lttng_kp->kp.addr = (void *) (unsigned long) addr;
/*
- * Ensure the memory we just allocated don't trigger page faults.
+ * Ensure the memory we just allocated don't event_notifier page faults.
* Well.. kprobes itself puts the page fault handler on the blacklist,
* but we can never be too careful.
*/
wrapper_vmalloc_sync_mappings();
- ret = register_kprobe(&event->u.kprobe.kp);
+ ret = register_kprobe(<tng_kp->kp);
if (ret)
goto register_error;
+
return 0;
register_error:
- kfree(event->u.kprobe.symbol_name);
+ kfree(lttng_kp->symbol_name);
name_error:
+ return ret;
+}
+
+int lttng_kprobes_register_event(const char *name,
+ const char *symbol_name,
+ uint64_t offset,
+ uint64_t addr,
+ struct lttng_event *event)
+{
+ int ret;
+
+ ret = lttng_create_kprobe_event(name, event);
+ if (ret)
+ goto error;
+
+ ret = _lttng_kprobes_register(symbol_name, offset, addr,
+ &event->u.kprobe, lttng_kprobes_event_handler_pre);
+ if (ret)
+ goto register_error;
+
+ return 0;
+
+register_error:
kfree(event->desc->fields);
kfree(event->desc->name);
kfree(event->desc);
error:
return ret;
}
-EXPORT_SYMBOL_GPL(lttng_kprobes_register);
+EXPORT_SYMBOL_GPL(lttng_kprobes_register_event);
-void lttng_kprobes_unregister(struct lttng_event *event)
+int lttng_kprobes_register_event_notifier(const char *symbol_name,
+ uint64_t offset,
+ uint64_t addr,
+ struct lttng_event_notifier *event_notifier)
+{
+ int ret;
+ ret = lttng_create_kprobe_event_notifier(symbol_name, event_notifier);
+ if (ret)
+ goto error;
+
+ ret = _lttng_kprobes_register(symbol_name, offset, addr,
+ &event_notifier->u.kprobe, lttng_kprobes_event_notifier_handler_pre);
+ if (ret)
+ goto register_error;
+
+ return 0;
+
+register_error:
+ kfree(event_notifier->desc->name);
+ kfree(event_notifier->desc);
+error:
+ return ret;
+}
+EXPORT_SYMBOL_GPL(lttng_kprobes_register_event_notifier);
+
+void lttng_kprobes_unregister_event(struct lttng_event *event)
{
unregister_kprobe(&event->u.kprobe.kp);
}
-EXPORT_SYMBOL_GPL(lttng_kprobes_unregister);
+EXPORT_SYMBOL_GPL(lttng_kprobes_unregister_event);
+
+void lttng_kprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier)
+{
+ unregister_kprobe(&event_notifier->u.kprobe.kp);
+}
+EXPORT_SYMBOL_GPL(lttng_kprobes_unregister_event_notifier);
-void lttng_kprobes_destroy_private(struct lttng_event *event)
+void lttng_kprobes_destroy_event_private(struct lttng_event *event)
{
kfree(event->u.kprobe.symbol_name);
kfree(event->desc->fields);
kfree(event->desc->name);
kfree(event->desc);
}
-EXPORT_SYMBOL_GPL(lttng_kprobes_destroy_private);
+EXPORT_SYMBOL_GPL(lttng_kprobes_destroy_event_private);
+
+void lttng_kprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier)
+{
+ kfree(event_notifier->u.kprobe.symbol_name);
+ kfree(event_notifier->desc->name);
+ kfree(event_notifier->desc);
+}
+EXPORT_SYMBOL_GPL(lttng_kprobes_destroy_event_notifier_private);
MODULE_LICENSE("GPL and additional rights");
MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
projects / lttng-modules.git / blobdiff