Adding upstream version 5.10.209.upstream/5.10.209

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1666 insertions, 0 deletions

diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
new file mode 100644
index 000000000..60ff36f5d
--- /dev/null
+++ b/kernel/trace/trace_uprobe.c
@@ -0,0 +1,1666 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * uprobes-based tracing events
+ *
+ * Copyright (C) IBM Corporation, 2010-2012
+ * Author:	Srikar Dronamraju <srikar@linux.vnet.ibm.com>
+ */
+#define pr_fmt(fmt)	"trace_uprobe: " fmt
+
+#include <linux/security.h>
+#include <linux/ctype.h>
+#include <linux/module.h>
+#include <linux/uaccess.h>
+#include <linux/uprobes.h>
+#include <linux/namei.h>
+#include <linux/string.h>
+#include <linux/rculist.h>
+
+#include "trace_dynevent.h"
+#include "trace_probe.h"
+#include "trace_probe_tmpl.h"
+
+#define UPROBE_EVENT_SYSTEM	"uprobes"
+
+struct uprobe_trace_entry_head {
+	struct trace_entry	ent;
+	unsigned long		vaddr[];
+};
+
+#define SIZEOF_TRACE_ENTRY(is_return)			\
+	(sizeof(struct uprobe_trace_entry_head) +	\
+	 sizeof(unsigned long) * (is_return ? 2 : 1))
+
+#define DATAOF_TRACE_ENTRY(entry, is_return)		\
+	((void*)(entry) + SIZEOF_TRACE_ENTRY(is_return))
+
+static int trace_uprobe_create(int argc, const char **argv);
+static int trace_uprobe_show(struct seq_file *m, struct dyn_event *ev);
+static int trace_uprobe_release(struct dyn_event *ev);
+static bool trace_uprobe_is_busy(struct dyn_event *ev);
+static bool trace_uprobe_match(const char *system, const char *event,
+			int argc, const char **argv, struct dyn_event *ev);
+
+static struct dyn_event_operations trace_uprobe_ops = {
+	.create = trace_uprobe_create,
+	.show = trace_uprobe_show,
+	.is_busy = trace_uprobe_is_busy,
+	.free = trace_uprobe_release,
+	.match = trace_uprobe_match,
+};
+
+/*
+ * uprobe event core functions
+ */
+struct trace_uprobe {
+	struct dyn_event		devent;
+	struct uprobe_consumer		consumer;
+	struct path			path;
+	struct inode			*inode;
+	char				*filename;
+	unsigned long			offset;
+	unsigned long			ref_ctr_offset;
+	unsigned long			nhit;
+	struct trace_probe		tp;
+};
+
+static bool is_trace_uprobe(struct dyn_event *ev)
+{
+	return ev->ops == &trace_uprobe_ops;
+}
+
+static struct trace_uprobe *to_trace_uprobe(struct dyn_event *ev)
+{
+	return container_of(ev, struct trace_uprobe, devent);
+}
+
+/**
+ * for_each_trace_uprobe - iterate over the trace_uprobe list
+ * @pos:	the struct trace_uprobe * for each entry
+ * @dpos:	the struct dyn_event * to use as a loop cursor
+ */
+#define for_each_trace_uprobe(pos, dpos)	\
+	for_each_dyn_event(dpos)		\
+		if (is_trace_uprobe(dpos) && (pos = to_trace_uprobe(dpos)))
+
+#define SIZEOF_TRACE_UPROBE(n)				\
+	(offsetof(struct trace_uprobe, tp.args) +	\
+	(sizeof(struct probe_arg) * (n)))
+
+static int register_uprobe_event(struct trace_uprobe *tu);
+static int unregister_uprobe_event(struct trace_uprobe *tu);
+
+struct uprobe_dispatch_data {
+	struct trace_uprobe	*tu;
+	unsigned long		bp_addr;
+};
+
+static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *regs);
+static int uretprobe_dispatcher(struct uprobe_consumer *con,
+				unsigned long func, struct pt_regs *regs);
+
+#ifdef CONFIG_STACK_GROWSUP
+static unsigned long adjust_stack_addr(unsigned long addr, unsigned int n)
+{
+	return addr - (n * sizeof(long));
+}
+#else
+static unsigned long adjust_stack_addr(unsigned long addr, unsigned int n)
+{
+	return addr + (n * sizeof(long));
+}
+#endif
+
+static unsigned long get_user_stack_nth(struct pt_regs *regs, unsigned int n)
+{
+	unsigned long ret;
+	unsigned long addr = user_stack_pointer(regs);
+
+	addr = adjust_stack_addr(addr, n);
+
+	if (copy_from_user(&ret, (void __force __user *) addr, sizeof(ret)))
+		return 0;
+
+	return ret;
+}
+
+/*
+ * Uprobes-specific fetch functions
+ */
+static nokprobe_inline int
+probe_mem_read(void *dest, void *src, size_t size)
+{
+	void __user *vaddr = (void __force __user *)src;
+
+	return copy_from_user(dest, vaddr, size) ? -EFAULT : 0;
+}
+
+static nokprobe_inline int
+probe_mem_read_user(void *dest, void *src, size_t size)
+{
+	return probe_mem_read(dest, src, size);
+}
+
+/*
+ * Fetch a null-terminated string. Caller MUST set *(u32 *)dest with max
+ * length and relative data location.
+ */
+static nokprobe_inline int
+fetch_store_string(unsigned long addr, void *dest, void *base)
+{
+	long ret;
+	u32 loc = *(u32 *)dest;
+	int maxlen  = get_loc_len(loc);
+	u8 *dst = get_loc_data(dest, base);
+	void __user *src = (void __force __user *) addr;
+
+	if (unlikely(!maxlen))
+		return -ENOMEM;
+
+	if (addr == FETCH_TOKEN_COMM)
+		ret = strlcpy(dst, current->comm, maxlen);
+	else
+		ret = strncpy_from_user(dst, src, maxlen);
+	if (ret >= 0) {
+		if (ret == maxlen)
+			dst[ret - 1] = '\0';
+		else
+			/*
+			 * Include the terminating null byte. In this case it
+			 * was copied by strncpy_from_user but not accounted
+			 * for in ret.
+			 */
+			ret++;
+		*(u32 *)dest = make_data_loc(ret, (void *)dst - base);
+	}
+
+	return ret;
+}
+
+static nokprobe_inline int
+fetch_store_string_user(unsigned long addr, void *dest, void *base)
+{
+	return fetch_store_string(addr, dest, base);
+}
+
+/* Return the length of string -- including null terminal byte */
+static nokprobe_inline int
+fetch_store_strlen(unsigned long addr)
+{
+	int len;
+	void __user *vaddr = (void __force __user *) addr;
+
+	if (addr == FETCH_TOKEN_COMM)
+		len = strlen(current->comm) + 1;
+	else
+		len = strnlen_user(vaddr, MAX_STRING_SIZE);
+
+	return (len > MAX_STRING_SIZE) ? 0 : len;
+}
+
+static nokprobe_inline int
+fetch_store_strlen_user(unsigned long addr)
+{
+	return fetch_store_strlen(addr);
+}
+
+static unsigned long translate_user_vaddr(unsigned long file_offset)
+{
+	unsigned long base_addr;
+	struct uprobe_dispatch_data *udd;
+
+	udd = (void *) current->utask->vaddr;
+
+	base_addr = udd->bp_addr - udd->tu->offset;
+	return base_addr + file_offset;
+}
+
+/* Note that we don't verify it, since the code does not come from user space */
+static int
+process_fetch_insn(struct fetch_insn *code, void *rec, void *dest,
+		   void *base)
+{
+	struct pt_regs *regs = rec;
+	unsigned long val;
+
+	/* 1st stage: get value from context */
+	switch (code->op) {
+	case FETCH_OP_REG:
+		val = regs_get_register(regs, code->param);
+		break;
+	case FETCH_OP_STACK:
+		val = get_user_stack_nth(regs, code->param);
+		break;
+	case FETCH_OP_STACKP:
+		val = user_stack_pointer(regs);
+		break;
+	case FETCH_OP_RETVAL:
+		val = regs_return_value(regs);
+		break;
+	case FETCH_OP_IMM:
+		val = code->immediate;
+		break;
+	case FETCH_OP_COMM:
+		val = FETCH_TOKEN_COMM;
+		break;
+	case FETCH_OP_DATA:
+		val = (unsigned long)code->data;
+		break;
+	case FETCH_OP_FOFFS:
+		val = translate_user_vaddr(code->immediate);
+		break;
+	default:
+		return -EILSEQ;
+	}
+	code++;
+
+	return process_fetch_insn_bottom(code, val, dest, base);
+}
+NOKPROBE_SYMBOL(process_fetch_insn)
+
+static inline void init_trace_uprobe_filter(struct trace_uprobe_filter *filter)
+{
+	rwlock_init(&filter->rwlock);
+	filter->nr_systemwide = 0;
+	INIT_LIST_HEAD(&filter->perf_events);
+}
+
+static inline bool uprobe_filter_is_empty(struct trace_uprobe_filter *filter)
+{
+	return !filter->nr_systemwide && list_empty(&filter->perf_events);
+}
+
+static inline bool is_ret_probe(struct trace_uprobe *tu)
+{
+	return tu->consumer.ret_handler != NULL;
+}
+
+static bool trace_uprobe_is_busy(struct dyn_event *ev)
+{
+	struct trace_uprobe *tu = to_trace_uprobe(ev);
+
+	return trace_probe_is_enabled(&tu->tp);
+}
+
+static bool trace_uprobe_match_command_head(struct trace_uprobe *tu,
+					    int argc, const char **argv)
+{
+	char buf[MAX_ARGSTR_LEN + 1];
+	int len;
+
+	if (!argc)
+		return true;
+
+	len = strlen(tu->filename);
+	if (strncmp(tu->filename, argv[0], len) || argv[0][len] != ':')
+		return false;
+
+	if (tu->ref_ctr_offset == 0)
+		snprintf(buf, sizeof(buf), "0x%0*lx",
+				(int)(sizeof(void *) * 2), tu->offset);
+	else
+		snprintf(buf, sizeof(buf), "0x%0*lx(0x%lx)",
+				(int)(sizeof(void *) * 2), tu->offset,
+				tu->ref_ctr_offset);
+	if (strcmp(buf, &argv[0][len + 1]))
+		return false;
+
+	argc--; argv++;
+
+	return trace_probe_match_command_args(&tu->tp, argc, argv);
+}
+
+static bool trace_uprobe_match(const char *system, const char *event,
+			int argc, const char **argv, struct dyn_event *ev)
+{
+	struct trace_uprobe *tu = to_trace_uprobe(ev);
+
+	return strcmp(trace_probe_name(&tu->tp), event) == 0 &&
+	   (!system || strcmp(trace_probe_group_name(&tu->tp), system) == 0) &&
+	   trace_uprobe_match_command_head(tu, argc, argv);
+}
+
+static nokprobe_inline struct trace_uprobe *
+trace_uprobe_primary_from_call(struct trace_event_call *call)
+{
+	struct trace_probe *tp;
+
+	tp = trace_probe_primary_from_call(call);
+	if (WARN_ON_ONCE(!tp))
+		return NULL;
+
+	return container_of(tp, struct trace_uprobe, tp);
+}
+
+/*
+ * Allocate new trace_uprobe and initialize it (including uprobes).
+ */
+static struct trace_uprobe *
+alloc_trace_uprobe(const char *group, const char *event, int nargs, bool is_ret)
+{
+	struct trace_uprobe *tu;
+	int ret;
+
+	tu = kzalloc(SIZEOF_TRACE_UPROBE(nargs), GFP_KERNEL);
+	if (!tu)
+		return ERR_PTR(-ENOMEM);
+
+	ret = trace_probe_init(&tu->tp, event, group, true);
+	if (ret < 0)
+		goto error;
+
+	dyn_event_init(&tu->devent, &trace_uprobe_ops);
+	tu->consumer.handler = uprobe_dispatcher;
+	if (is_ret)
+		tu->consumer.ret_handler = uretprobe_dispatcher;
+	init_trace_uprobe_filter(tu->tp.event->filter);
+	return tu;
+
+error:
+	kfree(tu);
+
+	return ERR_PTR(ret);
+}
+
+static void free_trace_uprobe(struct trace_uprobe *tu)
+{
+	if (!tu)
+		return;
+
+	path_put(&tu->path);
+	trace_probe_cleanup(&tu->tp);
+	kfree(tu->filename);
+	kfree(tu);
+}
+
+static struct trace_uprobe *find_probe_event(const char *event, const char *group)
+{
+	struct dyn_event *pos;
+	struct trace_uprobe *tu;
+
+	for_each_trace_uprobe(tu, pos)
+		if (strcmp(trace_probe_name(&tu->tp), event) == 0 &&
+		    strcmp(trace_probe_group_name(&tu->tp), group) == 0)
+			return tu;
+
+	return NULL;
+}
+
+/* Unregister a trace_uprobe and probe_event */
+static int unregister_trace_uprobe(struct trace_uprobe *tu)
+{
+	int ret;
+
+	if (trace_probe_has_sibling(&tu->tp))
+		goto unreg;
+
+	ret = unregister_uprobe_event(tu);
+	if (ret)
+		return ret;
+
+unreg:
+	dyn_event_remove(&tu->devent);
+	trace_probe_unlink(&tu->tp);
+	free_trace_uprobe(tu);
+	return 0;
+}
+
+static bool trace_uprobe_has_same_uprobe(struct trace_uprobe *orig,
+					 struct trace_uprobe *comp)
+{
+	struct trace_probe_event *tpe = orig->tp.event;
+	struct trace_probe *pos;
+	struct inode *comp_inode = d_real_inode(comp->path.dentry);
+	int i;
+
+	list_for_each_entry(pos, &tpe->probes, list) {
+		orig = container_of(pos, struct trace_uprobe, tp);
+		if (comp_inode != d_real_inode(orig->path.dentry) ||
+		    comp->offset != orig->offset)
+			continue;
+
+		/*
+		 * trace_probe_compare_arg_type() ensured that nr_args and
+		 * each argument name and type are same. Let's compare comm.
+		 */
+		for (i = 0; i < orig->tp.nr_args; i++) {
+			if (strcmp(orig->tp.args[i].comm,
+				   comp->tp.args[i].comm))
+				break;
+		}
+
+		if (i == orig->tp.nr_args)
+			return true;
+	}
+
+	return false;
+}
+
+static int append_trace_uprobe(struct trace_uprobe *tu, struct trace_uprobe *to)
+{
+	int ret;
+
+	ret = trace_probe_compare_arg_type(&tu->tp, &to->tp);
+	if (ret) {
+		/* Note that argument starts index = 2 */
+		trace_probe_log_set_index(ret + 1);
+		trace_probe_log_err(0, DIFF_ARG_TYPE);
+		return -EEXIST;
+	}
+	if (trace_uprobe_has_same_uprobe(to, tu)) {
+		trace_probe_log_set_index(0);
+		trace_probe_log_err(0, SAME_PROBE);
+		return -EEXIST;
+	}
+
+	/* Append to existing event */
+	ret = trace_probe_append(&tu->tp, &to->tp);
+	if (!ret)
+		dyn_event_add(&tu->devent);
+
+	return ret;
+}
+
+/*
+ * Uprobe with multiple reference counter is not allowed. i.e.
+ * If inode and offset matches, reference counter offset *must*
+ * match as well. Though, there is one exception: If user is
+ * replacing old trace_uprobe with new one(same group/event),
+ * then we allow same uprobe with new reference counter as far
+ * as the new one does not conflict with any other existing
+ * ones.
+ */
+static int validate_ref_ctr_offset(struct trace_uprobe *new)
+{
+	struct dyn_event *pos;
+	struct trace_uprobe *tmp;
+	struct inode *new_inode = d_real_inode(new->path.dentry);
+
+	for_each_trace_uprobe(tmp, pos) {
+		if (new_inode == d_real_inode(tmp->path.dentry) &&
+		    new->offset == tmp->offset &&
+		    new->ref_ctr_offset != tmp->ref_ctr_offset) {
+			pr_warn("Reference counter offset mismatch.");
+			return -EINVAL;
+		}
+	}
+	return 0;
+}
+
+/* Register a trace_uprobe and probe_event */
+static int register_trace_uprobe(struct trace_uprobe *tu)
+{
+	struct trace_uprobe *old_tu;
+	int ret;
+
+	mutex_lock(&event_mutex);
+
+	ret = validate_ref_ctr_offset(tu);
+	if (ret)
+		goto end;
+
+	/* register as an event */
+	old_tu = find_probe_event(trace_probe_name(&tu->tp),
+				  trace_probe_group_name(&tu->tp));
+	if (old_tu) {
+		if (is_ret_probe(tu) != is_ret_probe(old_tu)) {
+			trace_probe_log_set_index(0);
+			trace_probe_log_err(0, DIFF_PROBE_TYPE);
+			ret = -EEXIST;
+		} else {
+			ret = append_trace_uprobe(tu, old_tu);
+		}
+		goto end;
+	}
+
+	ret = register_uprobe_event(tu);
+	if (ret) {
+		if (ret == -EEXIST) {
+			trace_probe_log_set_index(0);
+			trace_probe_log_err(0, EVENT_EXIST);
+		} else
+			pr_warn("Failed to register probe event(%d)\n", ret);
+		goto end;
+	}
+
+	dyn_event_add(&tu->devent);
+
+end:
+	mutex_unlock(&event_mutex);
+
+	return ret;
+}
+
+/*
+ * Argument syntax:
+ *  - Add uprobe: p|r[:[GRP/]EVENT] PATH:OFFSET[%return][(REF)] [FETCHARGS]
+ */
+static int trace_uprobe_create(int argc, const char **argv)
+{
+	struct trace_uprobe *tu;
+	const char *event = NULL, *group = UPROBE_EVENT_SYSTEM;
+	char *arg, *filename, *rctr, *rctr_end, *tmp;
+	char buf[MAX_EVENT_NAME_LEN];
+	struct path path;
+	unsigned long offset, ref_ctr_offset;
+	bool is_return = false;
+	int i, ret;
+
+	ret = 0;
+	ref_ctr_offset = 0;
+
+	switch (argv[0][0]) {
+	case 'r':
+		is_return = true;
+		break;
+	case 'p':
+		break;
+	default:
+		return -ECANCELED;
+	}
+
+	if (argc < 2)
+		return -ECANCELED;
+
+	if (argv[0][1] == ':')
+		event = &argv[0][2];
+
+	if (!strchr(argv[1], '/'))
+		return -ECANCELED;
+
+	filename = kstrdup(argv[1], GFP_KERNEL);
+	if (!filename)
+		return -ENOMEM;
+
+	/* Find the last occurrence, in case the path contains ':' too. */
+	arg = strrchr(filename, ':');
+	if (!arg || !isdigit(arg[1])) {
+		kfree(filename);
+		return -ECANCELED;
+	}
+
+	trace_probe_log_init("trace_uprobe", argc, argv);
+	trace_probe_log_set_index(1);	/* filename is the 2nd argument */
+
+	*arg++ = '\0';
+	ret = kern_path(filename, LOOKUP_FOLLOW, &path);
+	if (ret) {
+		trace_probe_log_err(0, FILE_NOT_FOUND);
+		kfree(filename);
+		trace_probe_log_clear();
+		return ret;
+	}
+	if (!d_is_reg(path.dentry)) {
+		trace_probe_log_err(0, NO_REGULAR_FILE);
+		ret = -EINVAL;
+		goto fail_address_parse;
+	}
+
+	/* Parse reference counter offset if specified. */
+	rctr = strchr(arg, '(');
+	if (rctr) {
+		rctr_end = strchr(rctr, ')');
+		if (!rctr_end) {
+			ret = -EINVAL;
+			rctr_end = rctr + strlen(rctr);
+			trace_probe_log_err(rctr_end - filename,
+					    REFCNT_OPEN_BRACE);
+			goto fail_address_parse;
+		} else if (rctr_end[1] != '\0') {
+			ret = -EINVAL;
+			trace_probe_log_err(rctr_end + 1 - filename,
+					    BAD_REFCNT_SUFFIX);
+			goto fail_address_parse;
+		}
+
+		*rctr++ = '\0';
+		*rctr_end = '\0';
+		ret = kstrtoul(rctr, 0, &ref_ctr_offset);
+		if (ret) {
+			trace_probe_log_err(rctr - filename, BAD_REFCNT);
+			goto fail_address_parse;
+		}
+	}
+
+	/* Check if there is %return suffix */
+	tmp = strchr(arg, '%');
+	if (tmp) {
+		if (!strcmp(tmp, "%return")) {
+			*tmp = '\0';
+			is_return = true;
+		} else {
+			trace_probe_log_err(tmp - filename, BAD_ADDR_SUFFIX);
+			ret = -EINVAL;
+			goto fail_address_parse;
+		}
+	}
+
+	/* Parse uprobe offset. */
+	ret = kstrtoul(arg, 0, &offset);
+	if (ret) {
+		trace_probe_log_err(arg - filename, BAD_UPROBE_OFFS);
+		goto fail_address_parse;
+	}
+
+	/* setup a probe */
+	trace_probe_log_set_index(0);
+	if (event) {
+		ret = traceprobe_parse_event_name(&event, &group, buf,
+						  event - argv[0]);
+		if (ret)
+			goto fail_address_parse;
+	} else {
+		char *tail;
+		char *ptr;
+
+		tail = kstrdup(kbasename(filename), GFP_KERNEL);
+		if (!tail) {
+			ret = -ENOMEM;
+			goto fail_address_parse;
+		}
+
+		ptr = strpbrk(tail, ".-_");
+		if (ptr)
+			*ptr = '\0';
+
+		snprintf(buf, MAX_EVENT_NAME_LEN, "%c_%s_0x%lx", 'p', tail, offset);
+		event = buf;
+		kfree(tail);
+	}
+
+	argc -= 2;
+	argv += 2;
+
+	tu = alloc_trace_uprobe(group, event, argc, is_return);
+	if (IS_ERR(tu)) {
+		ret = PTR_ERR(tu);
+		/* This must return -ENOMEM otherwise there is a bug */
+		WARN_ON_ONCE(ret != -ENOMEM);
+		goto fail_address_parse;
+	}
+	tu->offset = offset;
+	tu->ref_ctr_offset = ref_ctr_offset;
+	tu->path = path;
+	tu->filename = filename;
+
+	/* parse arguments */
+	for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) {
+		tmp = kstrdup(argv[i], GFP_KERNEL);
+		if (!tmp) {
+			ret = -ENOMEM;
+			goto error;
+		}
+
+		trace_probe_log_set_index(i + 2);
+		ret = traceprobe_parse_probe_arg(&tu->tp, i, tmp,
+					is_return ? TPARG_FL_RETURN : 0);
+		kfree(tmp);
+		if (ret)
+			goto error;
+	}
+
+	ret = traceprobe_set_print_fmt(&tu->tp, is_ret_probe(tu));
+	if (ret < 0)
+		goto error;
+
+	ret = register_trace_uprobe(tu);
+	if (!ret)
+		goto out;
+
+error:
+	free_trace_uprobe(tu);
+out:
+	trace_probe_log_clear();
+	return ret;
+
+fail_address_parse:
+	trace_probe_log_clear();
+	path_put(&path);
+	kfree(filename);
+
+	return ret;
+}
+
+static int create_or_delete_trace_uprobe(int argc, char **argv)
+{
+	int ret;
+
+	if (argv[0][0] == '-')
+		return dyn_event_release(argc, argv, &trace_uprobe_ops);
+
+	ret = trace_uprobe_create(argc, (const char **)argv);
+	return ret == -ECANCELED ? -EINVAL : ret;
+}
+
+static int trace_uprobe_release(struct dyn_event *ev)
+{
+	struct trace_uprobe *tu = to_trace_uprobe(ev);
+
+	return unregister_trace_uprobe(tu);
+}
+
+/* Probes listing interfaces */
+static int trace_uprobe_show(struct seq_file *m, struct dyn_event *ev)
+{
+	struct trace_uprobe *tu = to_trace_uprobe(ev);
+	char c = is_ret_probe(tu) ? 'r' : 'p';
+	int i;
+
+	seq_printf(m, "%c:%s/%s %s:0x%0*lx", c, trace_probe_group_name(&tu->tp),
+			trace_probe_name(&tu->tp), tu->filename,
+			(int)(sizeof(void *) * 2), tu->offset);
+
+	if (tu->ref_ctr_offset)
+		seq_printf(m, "(0x%lx)", tu->ref_ctr_offset);
+
+	for (i = 0; i < tu->tp.nr_args; i++)
+		seq_printf(m, " %s=%s", tu->tp.args[i].name, tu->tp.args[i].comm);
+
+	seq_putc(m, '\n');
+	return 0;
+}
+
+static int probes_seq_show(struct seq_file *m, void *v)
+{
+	struct dyn_event *ev = v;
+
+	if (!is_trace_uprobe(ev))
+		return 0;
+
+	return trace_uprobe_show(m, ev);
+}
+
+static const struct seq_operations probes_seq_op = {
+	.start  = dyn_event_seq_start,
+	.next   = dyn_event_seq_next,
+	.stop   = dyn_event_seq_stop,
+	.show   = probes_seq_show
+};
+
+static int probes_open(struct inode *inode, struct file *file)
+{
+	int ret;
+
+	ret = security_locked_down(LOCKDOWN_TRACEFS);
+	if (ret)
+		return ret;
+
+	if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) {
+		ret = dyn_events_release_all(&trace_uprobe_ops);
+		if (ret)
+			return ret;
+	}
+
+	return seq_open(file, &probes_seq_op);
+}
+
+static ssize_t probes_write(struct file *file, const char __user *buffer,
+			    size_t count, loff_t *ppos)
+{
+	return trace_parse_run_command(file, buffer, count, ppos,
+					create_or_delete_trace_uprobe);
+}
+
+static const struct file_operations uprobe_events_ops = {
+	.owner		= THIS_MODULE,
+	.open		= probes_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= seq_release,
+	.write		= probes_write,
+};
+
+/* Probes profiling interfaces */
+static int probes_profile_seq_show(struct seq_file *m, void *v)
+{
+	struct dyn_event *ev = v;
+	struct trace_uprobe *tu;
+
+	if (!is_trace_uprobe(ev))
+		return 0;
+
+	tu = to_trace_uprobe(ev);
+	seq_printf(m, "  %s %-44s %15lu\n", tu->filename,
+			trace_probe_name(&tu->tp), tu->nhit);
+	return 0;
+}
+
+static const struct seq_operations profile_seq_op = {
+	.start  = dyn_event_seq_start,
+	.next   = dyn_event_seq_next,
+	.stop   = dyn_event_seq_stop,
+	.show	= probes_profile_seq_show
+};
+
+static int profile_open(struct inode *inode, struct file *file)
+{
+	int ret;
+
+	ret = security_locked_down(LOCKDOWN_TRACEFS);
+	if (ret)
+		return ret;
+
+	return seq_open(file, &profile_seq_op);
+}
+
+static const struct file_operations uprobe_profile_ops = {
+	.owner		= THIS_MODULE,
+	.open		= profile_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= seq_release,
+};
+
+struct uprobe_cpu_buffer {
+	struct mutex mutex;
+	void *buf;
+};
+static struct uprobe_cpu_buffer __percpu *uprobe_cpu_buffer;
+static int uprobe_buffer_refcnt;
+
+static int uprobe_buffer_init(void)
+{
+	int cpu, err_cpu;
+
+	uprobe_cpu_buffer = alloc_percpu(struct uprobe_cpu_buffer);
+	if (uprobe_cpu_buffer == NULL)
+		return -ENOMEM;
+
+	for_each_possible_cpu(cpu) {
+		struct page *p = alloc_pages_node(cpu_to_node(cpu),
+						  GFP_KERNEL, 0);
+		if (p == NULL) {
+			err_cpu = cpu;
+			goto err;
+		}
+		per_cpu_ptr(uprobe_cpu_buffer, cpu)->buf = page_address(p);
+		mutex_init(&per_cpu_ptr(uprobe_cpu_buffer, cpu)->mutex);
+	}
+
+	return 0;
+
+err:
+	for_each_possible_cpu(cpu) {
+		if (cpu == err_cpu)
+			break;
+		free_page((unsigned long)per_cpu_ptr(uprobe_cpu_buffer, cpu)->buf);
+	}
+
+	free_percpu(uprobe_cpu_buffer);
+	return -ENOMEM;
+}
+
+static int uprobe_buffer_enable(void)
+{
+	int ret = 0;
+
+	BUG_ON(!mutex_is_locked(&event_mutex));
+
+	if (uprobe_buffer_refcnt++ == 0) {
+		ret = uprobe_buffer_init();
+		if (ret < 0)
+			uprobe_buffer_refcnt--;
+	}
+
+	return ret;
+}
+
+static void uprobe_buffer_disable(void)
+{
+	int cpu;
+
+	BUG_ON(!mutex_is_locked(&event_mutex));
+
+	if (--uprobe_buffer_refcnt == 0) {
+		for_each_possible_cpu(cpu)
+			free_page((unsigned long)per_cpu_ptr(uprobe_cpu_buffer,
+							     cpu)->buf);
+
+		free_percpu(uprobe_cpu_buffer);
+		uprobe_cpu_buffer = NULL;
+	}
+}
+
+static struct uprobe_cpu_buffer *uprobe_buffer_get(void)
+{
+	struct uprobe_cpu_buffer *ucb;
+	int cpu;
+
+	cpu = raw_smp_processor_id();
+	ucb = per_cpu_ptr(uprobe_cpu_buffer, cpu);
+
+	/*
+	 * Use per-cpu buffers for fastest access, but we might migrate
+	 * so the mutex makes sure we have sole access to it.
+	 */
+	mutex_lock(&ucb->mutex);
+
+	return ucb;
+}
+
+static void uprobe_buffer_put(struct uprobe_cpu_buffer *ucb)
+{
+	mutex_unlock(&ucb->mutex);
+}
+
+static void __uprobe_trace_func(struct trace_uprobe *tu,
+				unsigned long func, struct pt_regs *regs,
+				struct uprobe_cpu_buffer *ucb, int dsize,
+				struct trace_event_file *trace_file)
+{
+	struct uprobe_trace_entry_head *entry;
+	struct trace_buffer *buffer;
+	struct ring_buffer_event *event;
+	void *data;
+	int size, esize;
+	struct trace_event_call *call = trace_probe_event_call(&tu->tp);
+
+	WARN_ON(call != trace_file->event_call);
+
+	if (WARN_ON_ONCE(tu->tp.size + dsize > PAGE_SIZE))
+		return;
+
+	if (trace_trigger_soft_disabled(trace_file))
+		return;
+
+	esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
+	size = esize + tu->tp.size + dsize;
+	event = trace_event_buffer_lock_reserve(&buffer, trace_file,
+						call->event.type, size, 0, 0);
+	if (!event)
+		return;
+
+	entry = ring_buffer_event_data(event);
+	if (is_ret_probe(tu)) {
+		entry->vaddr[0] = func;
+		entry->vaddr[1] = instruction_pointer(regs);
+		data = DATAOF_TRACE_ENTRY(entry, true);
+	} else {
+		entry->vaddr[0] = instruction_pointer(regs);
+		data = DATAOF_TRACE_ENTRY(entry, false);
+	}
+
+	memcpy(data, ucb->buf, tu->tp.size + dsize);
+
+	event_trigger_unlock_commit(trace_file, buffer, event, entry, 0, 0);
+}
+
+/* uprobe handler */
+static int uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs,
+			     struct uprobe_cpu_buffer *ucb, int dsize)
+{
+	struct event_file_link *link;
+
+	if (is_ret_probe(tu))
+		return 0;
+
+	rcu_read_lock();
+	trace_probe_for_each_link_rcu(link, &tu->tp)
+		__uprobe_trace_func(tu, 0, regs, ucb, dsize, link->file);
+	rcu_read_unlock();
+
+	return 0;
+}
+
+static void uretprobe_trace_func(struct trace_uprobe *tu, unsigned long func,
+				 struct pt_regs *regs,
+				 struct uprobe_cpu_buffer *ucb, int dsize)
+{
+	struct event_file_link *link;
+
+	rcu_read_lock();
+	trace_probe_for_each_link_rcu(link, &tu->tp)
+		__uprobe_trace_func(tu, func, regs, ucb, dsize, link->file);
+	rcu_read_unlock();
+}
+
+/* Event entry printers */
+static enum print_line_t
+print_uprobe_event(struct trace_iterator *iter, int flags, struct trace_event *event)
+{
+	struct uprobe_trace_entry_head *entry;
+	struct trace_seq *s = &iter->seq;
+	struct trace_uprobe *tu;
+	u8 *data;
+
+	entry = (struct uprobe_trace_entry_head *)iter->ent;
+	tu = trace_uprobe_primary_from_call(
+		container_of(event, struct trace_event_call, event));
+	if (unlikely(!tu))
+		goto out;
+
+	if (is_ret_probe(tu)) {
+		trace_seq_printf(s, "%s: (0x%lx <- 0x%lx)",
+				 trace_probe_name(&tu->tp),
+				 entry->vaddr[1], entry->vaddr[0]);
+		data = DATAOF_TRACE_ENTRY(entry, true);
+	} else {
+		trace_seq_printf(s, "%s: (0x%lx)",
+				 trace_probe_name(&tu->tp),
+				 entry->vaddr[0]);
+		data = DATAOF_TRACE_ENTRY(entry, false);
+	}
+
+	if (print_probe_args(s, tu->tp.args, tu->tp.nr_args, data, entry) < 0)
+		goto out;
+
+	trace_seq_putc(s, '\n');
+
+ out:
+	return trace_handle_return(s);
+}
+
+typedef bool (*filter_func_t)(struct uprobe_consumer *self,
+				enum uprobe_filter_ctx ctx,
+				struct mm_struct *mm);
+
+static int trace_uprobe_enable(struct trace_uprobe *tu, filter_func_t filter)
+{
+	int ret;
+
+	tu->consumer.filter = filter;
+	tu->inode = d_real_inode(tu->path.dentry);
+
+	if (tu->ref_ctr_offset)
+		ret = uprobe_register_refctr(tu->inode, tu->offset,
+				tu->ref_ctr_offset, &tu->consumer);
+	else
+		ret = uprobe_register(tu->inode, tu->offset, &tu->consumer);
+
+	if (ret)
+		tu->inode = NULL;
+
+	return ret;
+}
+
+static void __probe_event_disable(struct trace_probe *tp)
+{
+	struct trace_probe *pos;
+	struct trace_uprobe *tu;
+
+	tu = container_of(tp, struct trace_uprobe, tp);
+	WARN_ON(!uprobe_filter_is_empty(tu->tp.event->filter));
+
+	list_for_each_entry(pos, trace_probe_probe_list(tp), list) {
+		tu = container_of(pos, struct trace_uprobe, tp);
+		if (!tu->inode)
+			continue;
+
+		uprobe_unregister(tu->inode, tu->offset, &tu->consumer);
+		tu->inode = NULL;
+	}
+}
+
+static int probe_event_enable(struct trace_event_call *call,
+			struct trace_event_file *file, filter_func_t filter)
+{
+	struct trace_probe *pos, *tp;
+	struct trace_uprobe *tu;
+	bool enabled;
+	int ret;
+
+	tp = trace_probe_primary_from_call(call);
+	if (WARN_ON_ONCE(!tp))
+		return -ENODEV;
+	enabled = trace_probe_is_enabled(tp);
+
+	/* This may also change "enabled" state */
+	if (file) {
+		if (trace_probe_test_flag(tp, TP_FLAG_PROFILE))
+			return -EINTR;
+
+		ret = trace_probe_add_file(tp, file);
+		if (ret < 0)
+			return ret;
+	} else {
+		if (trace_probe_test_flag(tp, TP_FLAG_TRACE))
+			return -EINTR;
+
+		trace_probe_set_flag(tp, TP_FLAG_PROFILE);
+	}
+
+	tu = container_of(tp, struct trace_uprobe, tp);
+	WARN_ON(!uprobe_filter_is_empty(tu->tp.event->filter));
+
+	if (enabled)
+		return 0;
+
+	ret = uprobe_buffer_enable();
+	if (ret)
+		goto err_flags;
+
+	list_for_each_entry(pos, trace_probe_probe_list(tp), list) {
+		tu = container_of(pos, struct trace_uprobe, tp);
+		ret = trace_uprobe_enable(tu, filter);
+		if (ret) {
+			__probe_event_disable(tp);
+			goto err_buffer;
+		}
+	}
+
+	return 0;
+
+ err_buffer:
+	uprobe_buffer_disable();
+
+ err_flags:
+	if (file)
+		trace_probe_remove_file(tp, file);
+	else
+		trace_probe_clear_flag(tp, TP_FLAG_PROFILE);
+
+	return ret;
+}
+
+static void probe_event_disable(struct trace_event_call *call,
+				struct trace_event_file *file)
+{
+	struct trace_probe *tp;
+
+	tp = trace_probe_primary_from_call(call);
+	if (WARN_ON_ONCE(!tp))
+		return;
+
+	if (!trace_probe_is_enabled(tp))
+		return;
+
+	if (file) {
+		if (trace_probe_remove_file(tp, file) < 0)
+			return;
+
+		if (trace_probe_is_enabled(tp))
+			return;
+	} else
+		trace_probe_clear_flag(tp, TP_FLAG_PROFILE);
+
+	__probe_event_disable(tp);
+	uprobe_buffer_disable();
+}
+
+static int uprobe_event_define_fields(struct trace_event_call *event_call)
+{
+	int ret, size;
+	struct uprobe_trace_entry_head field;
+	struct trace_uprobe *tu;
+
+	tu = trace_uprobe_primary_from_call(event_call);
+	if (unlikely(!tu))
+		return -ENODEV;
+
+	if (is_ret_probe(tu)) {
+		DEFINE_FIELD(unsigned long, vaddr[0], FIELD_STRING_FUNC, 0);
+		DEFINE_FIELD(unsigned long, vaddr[1], FIELD_STRING_RETIP, 0);
+		size = SIZEOF_TRACE_ENTRY(true);
+	} else {
+		DEFINE_FIELD(unsigned long, vaddr[0], FIELD_STRING_IP, 0);
+		size = SIZEOF_TRACE_ENTRY(false);
+	}
+
+	return traceprobe_define_arg_fields(event_call, size, &tu->tp);
+}
+
+#ifdef CONFIG_PERF_EVENTS
+static bool
+__uprobe_perf_filter(struct trace_uprobe_filter *filter, struct mm_struct *mm)
+{
+	struct perf_event *event;
+
+	if (filter->nr_systemwide)
+		return true;
+
+	list_for_each_entry(event, &filter->perf_events, hw.tp_list) {
+		if (event->hw.target->mm == mm)
+			return true;
+	}
+
+	return false;
+}
+
+static inline bool
+trace_uprobe_filter_event(struct trace_uprobe_filter *filter,
+			  struct perf_event *event)
+{
+	return __uprobe_perf_filter(filter, event->hw.target->mm);
+}
+
+static bool trace_uprobe_filter_remove(struct trace_uprobe_filter *filter,
+				       struct perf_event *event)
+{
+	bool done;
+
+	write_lock(&filter->rwlock);
+	if (event->hw.target) {
+		list_del(&event->hw.tp_list);
+		done = filter->nr_systemwide ||
+			(event->hw.target->flags & PF_EXITING) ||
+			trace_uprobe_filter_event(filter, event);
+	} else {
+		filter->nr_systemwide--;
+		done = filter->nr_systemwide;
+	}
+	write_unlock(&filter->rwlock);
+
+	return done;
+}
+
+/* This returns true if the filter always covers target mm */
+static bool trace_uprobe_filter_add(struct trace_uprobe_filter *filter,
+				    struct perf_event *event)
+{
+	bool done;
+
+	write_lock(&filter->rwlock);
+	if (event->hw.target) {
+		/*
+		 * event->parent != NULL means copy_process(), we can avoid
+		 * uprobe_apply(). current->mm must be probed and we can rely
+		 * on dup_mmap() which preserves the already installed bp's.
+		 *
+		 * attr.enable_on_exec means that exec/mmap will install the
+		 * breakpoints we need.
+		 */
+		done = filter->nr_systemwide ||
+			event->parent || event->attr.enable_on_exec ||
+			trace_uprobe_filter_event(filter, event);
+		list_add(&event->hw.tp_list, &filter->perf_events);
+	} else {
+		done = filter->nr_systemwide;
+		filter->nr_systemwide++;
+	}
+	write_unlock(&filter->rwlock);
+
+	return done;
+}
+
+static int uprobe_perf_close(struct trace_event_call *call,
+			     struct perf_event *event)
+{
+	struct trace_probe *pos, *tp;
+	struct trace_uprobe *tu;
+	int ret = 0;
+
+	tp = trace_probe_primary_from_call(call);
+	if (WARN_ON_ONCE(!tp))
+		return -ENODEV;
+
+	tu = container_of(tp, struct trace_uprobe, tp);
+	if (trace_uprobe_filter_remove(tu->tp.event->filter, event))
+		return 0;
+
+	list_for_each_entry(pos, trace_probe_probe_list(tp), list) {
+		tu = container_of(pos, struct trace_uprobe, tp);
+		ret = uprobe_apply(tu->inode, tu->offset, &tu->consumer, false);
+		if (ret)
+			break;
+	}
+
+	return ret;
+}
+
+static int uprobe_perf_open(struct trace_event_call *call,
+			    struct perf_event *event)
+{
+	struct trace_probe *pos, *tp;
+	struct trace_uprobe *tu;
+	int err = 0;
+
+	tp = trace_probe_primary_from_call(call);
+	if (WARN_ON_ONCE(!tp))
+		return -ENODEV;
+
+	tu = container_of(tp, struct trace_uprobe, tp);
+	if (trace_uprobe_filter_add(tu->tp.event->filter, event))
+		return 0;
+
+	list_for_each_entry(pos, trace_probe_probe_list(tp), list) {
+		tu = container_of(pos, struct trace_uprobe, tp);
+		err = uprobe_apply(tu->inode, tu->offset, &tu->consumer, true);
+		if (err) {
+			uprobe_perf_close(call, event);
+			break;
+		}
+	}
+
+	return err;
+}
+
+static bool uprobe_perf_filter(struct uprobe_consumer *uc,
+				enum uprobe_filter_ctx ctx, struct mm_struct *mm)
+{
+	struct trace_uprobe_filter *filter;
+	struct trace_uprobe *tu;
+	int ret;
+
+	tu = container_of(uc, struct trace_uprobe, consumer);
+	filter = tu->tp.event->filter;
+
+	read_lock(&filter->rwlock);
+	ret = __uprobe_perf_filter(filter, mm);
+	read_unlock(&filter->rwlock);
+
+	return ret;
+}
+
+static void __uprobe_perf_func(struct trace_uprobe *tu,
+			       unsigned long func, struct pt_regs *regs,
+			       struct uprobe_cpu_buffer *ucb, int dsize)
+{
+	struct trace_event_call *call = trace_probe_event_call(&tu->tp);
+	struct uprobe_trace_entry_head *entry;
+	struct hlist_head *head;
+	void *data;
+	int size, esize;
+	int rctx;
+
+	if (bpf_prog_array_valid(call)) {
+		u32 ret;
+
+		preempt_disable();
+		ret = trace_call_bpf(call, regs);
+		preempt_enable();
+		if (!ret)
+			return;
+	}
+
+	esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
+
+	size = esize + tu->tp.size + dsize;
+	size = ALIGN(size + sizeof(u32), sizeof(u64)) - sizeof(u32);
+	if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE, "profile buffer not large enough"))
+		return;
+
+	preempt_disable();
+	head = this_cpu_ptr(call->perf_events);
+	if (hlist_empty(head))
+		goto out;
+
+	entry = perf_trace_buf_alloc(size, NULL, &rctx);
+	if (!entry)
+		goto out;
+
+	if (is_ret_probe(tu)) {
+		entry->vaddr[0] = func;
+		entry->vaddr[1] = instruction_pointer(regs);
+		data = DATAOF_TRACE_ENTRY(entry, true);
+	} else {
+		entry->vaddr[0] = instruction_pointer(regs);
+		data = DATAOF_TRACE_ENTRY(entry, false);
+	}
+
+	memcpy(data, ucb->buf, tu->tp.size + dsize);
+
+	if (size - esize > tu->tp.size + dsize) {
+		int len = tu->tp.size + dsize;
+
+		memset(data + len, 0, size - esize - len);
+	}
+
+	perf_trace_buf_submit(entry, size, rctx, call->event.type, 1, regs,
+			      head, NULL);
+ out:
+	preempt_enable();
+}
+
+/* uprobe profile handler */
+static int uprobe_perf_func(struct trace_uprobe *tu, struct pt_regs *regs,
+			    struct uprobe_cpu_buffer *ucb, int dsize)
+{
+	if (!uprobe_perf_filter(&tu->consumer, 0, current->mm))
+		return UPROBE_HANDLER_REMOVE;
+
+	if (!is_ret_probe(tu))
+		__uprobe_perf_func(tu, 0, regs, ucb, dsize);
+	return 0;
+}
+
+static void uretprobe_perf_func(struct trace_uprobe *tu, unsigned long func,
+				struct pt_regs *regs,
+				struct uprobe_cpu_buffer *ucb, int dsize)
+{
+	__uprobe_perf_func(tu, func, regs, ucb, dsize);
+}
+
+int bpf_get_uprobe_info(const struct perf_event *event, u32 *fd_type,
+			const char **filename, u64 *probe_offset,
+			u64 *probe_addr, bool perf_type_tracepoint)
+{
+	const char *pevent = trace_event_name(event->tp_event);
+	const char *group = event->tp_event->class->system;
+	struct trace_uprobe *tu;
+
+	if (perf_type_tracepoint)
+		tu = find_probe_event(pevent, group);
+	else
+		tu = trace_uprobe_primary_from_call(event->tp_event);
+	if (!tu)
+		return -EINVAL;
+
+	*fd_type = is_ret_probe(tu) ? BPF_FD_TYPE_URETPROBE
+				    : BPF_FD_TYPE_UPROBE;
+	*filename = tu->filename;
+	*probe_offset = tu->offset;
+	*probe_addr = 0;
+	return 0;
+}
+#endif	/* CONFIG_PERF_EVENTS */
+
+static int
+trace_uprobe_register(struct trace_event_call *event, enum trace_reg type,
+		      void *data)
+{
+	struct trace_event_file *file = data;
+
+	switch (type) {
+	case TRACE_REG_REGISTER:
+		return probe_event_enable(event, file, NULL);
+
+	case TRACE_REG_UNREGISTER:
+		probe_event_disable(event, file);
+		return 0;
+
+#ifdef CONFIG_PERF_EVENTS
+	case TRACE_REG_PERF_REGISTER:
+		return probe_event_enable(event, NULL, uprobe_perf_filter);
+
+	case TRACE_REG_PERF_UNREGISTER:
+		probe_event_disable(event, NULL);
+		return 0;
+
+	case TRACE_REG_PERF_OPEN:
+		return uprobe_perf_open(event, data);
+
+	case TRACE_REG_PERF_CLOSE:
+		return uprobe_perf_close(event, data);
+
+#endif
+	default:
+		return 0;
+	}
+}
+
+static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *regs)
+{
+	struct trace_uprobe *tu;
+	struct uprobe_dispatch_data udd;
+	struct uprobe_cpu_buffer *ucb;
+	int dsize, esize;
+	int ret = 0;
+
+
+	tu = container_of(con, struct trace_uprobe, consumer);
+	tu->nhit++;
+
+	udd.tu = tu;
+	udd.bp_addr = instruction_pointer(regs);
+
+	current->utask->vaddr = (unsigned long) &udd;
+
+	if (WARN_ON_ONCE(!uprobe_cpu_buffer))
+		return 0;
+
+	dsize = __get_data_size(&tu->tp, regs);
+	esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
+
+	ucb = uprobe_buffer_get();
+	store_trace_args(ucb->buf, &tu->tp, regs, esize, dsize);
+
+	if (trace_probe_test_flag(&tu->tp, TP_FLAG_TRACE))
+		ret |= uprobe_trace_func(tu, regs, ucb, dsize);
+
+#ifdef CONFIG_PERF_EVENTS
+	if (trace_probe_test_flag(&tu->tp, TP_FLAG_PROFILE))
+		ret |= uprobe_perf_func(tu, regs, ucb, dsize);
+#endif
+	uprobe_buffer_put(ucb);
+	return ret;
+}
+
+static int uretprobe_dispatcher(struct uprobe_consumer *con,
+				unsigned long func, struct pt_regs *regs)
+{
+	struct trace_uprobe *tu;
+	struct uprobe_dispatch_data udd;
+	struct uprobe_cpu_buffer *ucb;
+	int dsize, esize;
+
+	tu = container_of(con, struct trace_uprobe, consumer);
+
+	udd.tu = tu;
+	udd.bp_addr = func;
+
+	current->utask->vaddr = (unsigned long) &udd;
+
+	if (WARN_ON_ONCE(!uprobe_cpu_buffer))
+		return 0;
+
+	dsize = __get_data_size(&tu->tp, regs);
+	esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
+
+	ucb = uprobe_buffer_get();
+	store_trace_args(ucb->buf, &tu->tp, regs, esize, dsize);
+
+	if (trace_probe_test_flag(&tu->tp, TP_FLAG_TRACE))
+		uretprobe_trace_func(tu, func, regs, ucb, dsize);
+
+#ifdef CONFIG_PERF_EVENTS
+	if (trace_probe_test_flag(&tu->tp, TP_FLAG_PROFILE))
+		uretprobe_perf_func(tu, func, regs, ucb, dsize);
+#endif
+	uprobe_buffer_put(ucb);
+	return 0;
+}
+
+static struct trace_event_functions uprobe_funcs = {
+	.trace		= print_uprobe_event
+};
+
+static struct trace_event_fields uprobe_fields_array[] = {
+	{ .type = TRACE_FUNCTION_TYPE,
+	  .define_fields = uprobe_event_define_fields },
+	{}
+};
+
+static inline void init_trace_event_call(struct trace_uprobe *tu)
+{
+	struct trace_event_call *call = trace_probe_event_call(&tu->tp);
+	call->event.funcs = &uprobe_funcs;
+	call->class->fields_array = uprobe_fields_array;
+
+	call->flags = TRACE_EVENT_FL_UPROBE | TRACE_EVENT_FL_CAP_ANY;
+	call->class->reg = trace_uprobe_register;
+}
+
+static int register_uprobe_event(struct trace_uprobe *tu)
+{
+	init_trace_event_call(tu);
+
+	return trace_probe_register_event_call(&tu->tp);
+}
+
+static int unregister_uprobe_event(struct trace_uprobe *tu)
+{
+	return trace_probe_unregister_event_call(&tu->tp);
+}
+
+#ifdef CONFIG_PERF_EVENTS
+struct trace_event_call *
+create_local_trace_uprobe(char *name, unsigned long offs,
+			  unsigned long ref_ctr_offset, bool is_return)
+{
+	struct trace_uprobe *tu;
+	struct path path;
+	int ret;
+
+	ret = kern_path(name, LOOKUP_FOLLOW, &path);
+	if (ret)
+		return ERR_PTR(ret);
+
+	if (!d_is_reg(path.dentry)) {
+		path_put(&path);
+		return ERR_PTR(-EINVAL);
+	}
+
+	/*
+	 * local trace_kprobes are not added to dyn_event, so they are never
+	 * searched in find_trace_kprobe(). Therefore, there is no concern of
+	 * duplicated name "DUMMY_EVENT" here.
+	 */
+	tu = alloc_trace_uprobe(UPROBE_EVENT_SYSTEM, "DUMMY_EVENT", 0,
+				is_return);
+
+	if (IS_ERR(tu)) {
+		pr_info("Failed to allocate trace_uprobe.(%d)\n",
+			(int)PTR_ERR(tu));
+		path_put(&path);
+		return ERR_CAST(tu);
+	}
+
+	tu->offset = offs;
+	tu->path = path;
+	tu->ref_ctr_offset = ref_ctr_offset;
+	tu->filename = kstrdup(name, GFP_KERNEL);
+	init_trace_event_call(tu);
+
+	if (traceprobe_set_print_fmt(&tu->tp, is_ret_probe(tu)) < 0) {
+		ret = -ENOMEM;
+		goto error;
+	}
+
+	return trace_probe_event_call(&tu->tp);
+error:
+	free_trace_uprobe(tu);
+	return ERR_PTR(ret);
+}
+
+void destroy_local_trace_uprobe(struct trace_event_call *event_call)
+{
+	struct trace_uprobe *tu;
+
+	tu = trace_uprobe_primary_from_call(event_call);
+
+	free_trace_uprobe(tu);
+}
+#endif /* CONFIG_PERF_EVENTS */
+
+/* Make a trace interface for controling probe points */
+static __init int init_uprobe_trace(void)
+{
+	int ret;
+
+	ret = dyn_event_register(&trace_uprobe_ops);
+	if (ret)
+		return ret;
+
+	ret = tracing_init_dentry();
+	if (ret)
+		return 0;
+
+	trace_create_file("uprobe_events", 0644, NULL,
+				    NULL, &uprobe_events_ops);
+	/* Profile interface */
+	trace_create_file("uprobe_profile", 0444, NULL,
+				    NULL, &uprobe_profile_ops);
+	return 0;
+}
+
+fs_initcall(init_uprobe_trace);