Cleanup: Move all source files to src/

[lttng-modules.git] / probes / lttng-kprobes.c

diff --git a/probes/lttng-kprobes.c b/probes/lttng-kprobes.c
deleted file mode 100644 (file)
index a2474d0..0000000
--- 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 <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);