X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=probes%2Flttng-kprobes.c;h=131333b03698941bb7f156e7294c1aa16e28d1de;hb=HEAD;hp=d0a48d2894db0e321af1b4b8ea32240a0f729471;hpb=263b6c88138c3354d63dba3c70a965de94becd22;p=lttng-modules.git

diff --git a/probes/lttng-kprobes.c b/probes/lttng-kprobes.c
deleted file mode 100644
index d0a48d28..00000000
--- a/probes/lttng-kprobes.c
+++ /dev/null
@@ -1,174 +0,0 @@
-/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
- *
- * probes/lttng-kprobes.c
- *
- * LTTng kprobes integration module.
- *
- * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- */
-
-#include <linux/module.h>
-#include <linux/kprobes.h>
-#include <linux/slab.h>
-#include <lttng-events.h>
-#include <wrapper/ringbuffer/frontend_types.h>
-#include <wrapper/vmalloc.h>
-#include <wrapper/irqflags.h>
-#include <lttng-tracer.h>
-#include <blacklist/kprobes.h>
-
-static
-int lttng_kprobes_handler_pre(struct kprobe *p, struct pt_regs *regs)
-{
-	struct lttng_event *event =
-		container_of(p, struct lttng_event, u.kprobe.kp);
-	struct lttng_probe_ctx lttng_probe_ctx = {
-		.event = event,
-		.interruptible = !lttng_regs_irqs_disabled(regs),
-	};
-	struct lttng_channel *chan = event->chan;
-	struct lib_ring_buffer_ctx ctx;
-	int ret;
-	unsigned long data = (unsigned long) p->addr;
-
-	if (unlikely(!READ_ONCE(chan->session->active)))
-		return 0;
-	if (unlikely(!READ_ONCE(chan->enabled)))
-		return 0;
-	if (unlikely(!READ_ONCE(event->enabled)))
-		return 0;
-
-	lib_ring_buffer_ctx_init(&ctx, chan->chan, &lttng_probe_ctx, sizeof(data),
-				 lttng_alignof(data), -1);
-	ret = chan->ops->event_reserve(&ctx, event->id);
-	if (ret < 0)
-		return 0;
-	lib_ring_buffer_align_ctx(&ctx, lttng_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 lttng_event *event)
-{
-	struct lttng_event_field *field;
-	struct lttng_event_desc *desc;
-	int ret;
-
-	desc = kzalloc(sizeof(*event->desc), GFP_KERNEL);
-	if (!desc)
-		return -ENOMEM;
-	desc->name = kstrdup(name, GFP_KERNEL);
-	if (!desc->name) {
-		ret = -ENOMEM;
-		goto error_str;
-	}
-	desc->nr_fields = 1;
-	desc->fields = field =
-		kzalloc(1 * sizeof(struct lttng_event_field), GFP_KERNEL);
-	if (!field) {
-		ret = -ENOMEM;
-		goto error_field;
-	}
-	field->name = "ip";
-	field->type.atype = atype_integer;
-	field->type.u.integer.size = sizeof(unsigned long) * CHAR_BIT;
-	field->type.u.integer.alignment = lttng_alignof(unsigned long) * CHAR_BIT;
-	field->type.u.integer.signedness = lttng_is_signed_type(unsigned long);
-	field->type.u.integer.reverse_byte_order = 0;
-	field->type.u.integer.base = 16;
-	field->type.u.integer.encoding = lttng_encode_none;
-	desc->owner = THIS_MODULE;
-	event->desc = desc;
-
-	return 0;
-
-error_field:
-	kfree(desc->name);
-error_str:
-	kfree(desc);
-	return ret;
-}
-
-int lttng_kprobes_register(const char *name,
-			   const char *symbol_name,
-			   uint64_t offset,
-			   uint64_t addr,
-			   struct lttng_event *event)
-{
-	int ret;
-
-	/* Kprobes expects a NULL symbol name if unused */
-	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;
-	if (symbol_name) {
-		event->u.kprobe.symbol_name =
-			kzalloc(LTTNG_KERNEL_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_KERNEL_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 *) (unsigned long) addr;
-
-	/*
-	 * Ensure the memory we just allocated don't trigger 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);
-	if (ret)
-		goto register_error;
-	return 0;
-
-register_error:
-	kfree(event->u.kprobe.symbol_name);
-name_error:
-	kfree(event->desc->fields);
-	kfree(event->desc->name);
-	kfree(event->desc);
-error:
-	return ret;
-}
-EXPORT_SYMBOL_GPL(lttng_kprobes_register);
-
-void lttng_kprobes_unregister(struct lttng_event *event)
-{
-	unregister_kprobe(&event->u.kprobe.kp);
-}
-EXPORT_SYMBOL_GPL(lttng_kprobes_unregister);
-
-void lttng_kprobes_destroy_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);
-
-MODULE_LICENSE("GPL and additional rights");
-MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
-MODULE_DESCRIPTION("LTTng kprobes probes");
-MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
-	__stringify(LTTNG_MODULES_MINOR_VERSION) "."
-	__stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
-	LTTNG_MODULES_EXTRAVERSION);