From 306cfe2025adcba10fb883ad0c540f5541d1b086 Mon Sep 17 00:00:00 2001
From: Namhyung Kim <namhyung.kim@lge.com>
Date: Wed, 3 Jul 2013 16:44:46 +0900
Subject: tracing/uprobes: Fix documentation of uprobe registration syntax

The uprobe syntax requires an offset after a file path not a symbol.

Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 kernel/trace/trace_uprobe.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'kernel/trace/trace_uprobe.c')

diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index b6dcc42ef7f..c77b92d6155 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -211,7 +211,7 @@ end:
 
 /*
  * Argument syntax:
- *  - Add uprobe: p|r[:[GRP/]EVENT] PATH:SYMBOL [FETCHARGS]
+ *  - Add uprobe: p|r[:[GRP/]EVENT] PATH:OFFSET [FETCHARGS]
  *
  *  - Remove uprobe: -:[GRP/]EVENT
  */
-- 
cgit v1.2.3-70-g09d2


From 14577c39927f86e3dba967f9b511f4a876b7f8bb Mon Sep 17 00:00:00 2001
From: Namhyung Kim <namhyung.kim@lge.com>
Date: Wed, 3 Jul 2013 15:42:53 +0900
Subject: tracing/uprobes: Convert to struct trace_probe

Convert struct trace_uprobe to make use of the common trace_probe
structure.

Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 kernel/trace/trace_uprobe.c | 159 ++++++++++++++++++++++----------------------
 1 file changed, 79 insertions(+), 80 deletions(-)

(limited to 'kernel/trace/trace_uprobe.c')

diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index c77b92d6155..afda3726f28 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -51,22 +51,17 @@ struct trace_uprobe_filter {
  */
 struct trace_uprobe {
 	struct list_head		list;
-	struct ftrace_event_class	class;
-	struct ftrace_event_call	call;
 	struct trace_uprobe_filter	filter;
 	struct uprobe_consumer		consumer;
 	struct inode			*inode;
 	char				*filename;
 	unsigned long			offset;
 	unsigned long			nhit;
-	unsigned int			flags;	/* For TP_FLAG_* */
-	ssize_t				size;	/* trace entry size */
-	unsigned int			nr_args;
-	struct probe_arg		args[];
+	struct trace_probe		tp;
 };
 
-#define SIZEOF_TRACE_UPROBE(n)			\
-	(offsetof(struct trace_uprobe, args) +	\
+#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);
@@ -114,13 +109,13 @@ alloc_trace_uprobe(const char *group, const char *event, int nargs, bool is_ret)
 	if (!tu)
 		return ERR_PTR(-ENOMEM);
 
-	tu->call.class = &tu->class;
-	tu->call.name = kstrdup(event, GFP_KERNEL);
-	if (!tu->call.name)
+	tu->tp.call.class = &tu->tp.class;
+	tu->tp.call.name = kstrdup(event, GFP_KERNEL);
+	if (!tu->tp.call.name)
 		goto error;
 
-	tu->class.system = kstrdup(group, GFP_KERNEL);
-	if (!tu->class.system)
+	tu->tp.class.system = kstrdup(group, GFP_KERNEL);
+	if (!tu->tp.class.system)
 		goto error;
 
 	INIT_LIST_HEAD(&tu->list);
@@ -128,11 +123,11 @@ alloc_trace_uprobe(const char *group, const char *event, int nargs, bool is_ret)
 	if (is_ret)
 		tu->consumer.ret_handler = uretprobe_dispatcher;
 	init_trace_uprobe_filter(&tu->filter);
-	tu->call.flags |= TRACE_EVENT_FL_USE_CALL_FILTER;
+	tu->tp.call.flags |= TRACE_EVENT_FL_USE_CALL_FILTER;
 	return tu;
 
 error:
-	kfree(tu->call.name);
+	kfree(tu->tp.call.name);
 	kfree(tu);
 
 	return ERR_PTR(-ENOMEM);
@@ -142,12 +137,12 @@ static void free_trace_uprobe(struct trace_uprobe *tu)
 {
 	int i;
 
-	for (i = 0; i < tu->nr_args; i++)
-		traceprobe_free_probe_arg(&tu->args[i]);
+	for (i = 0; i < tu->tp.nr_args; i++)
+		traceprobe_free_probe_arg(&tu->tp.args[i]);
 
 	iput(tu->inode);
-	kfree(tu->call.class->system);
-	kfree(tu->call.name);
+	kfree(tu->tp.call.class->system);
+	kfree(tu->tp.call.name);
 	kfree(tu->filename);
 	kfree(tu);
 }
@@ -157,8 +152,8 @@ static struct trace_uprobe *find_probe_event(const char *event, const char *grou
 	struct trace_uprobe *tu;
 
 	list_for_each_entry(tu, &uprobe_list, list)
-		if (strcmp(tu->call.name, event) == 0 &&
-		    strcmp(tu->call.class->system, group) == 0)
+		if (strcmp(tu->tp.call.name, event) == 0 &&
+		    strcmp(tu->tp.call.class->system, group) == 0)
 			return tu;
 
 	return NULL;
@@ -181,16 +176,16 @@ static int unregister_trace_uprobe(struct trace_uprobe *tu)
 /* Register a trace_uprobe and probe_event */
 static int register_trace_uprobe(struct trace_uprobe *tu)
 {
-	struct trace_uprobe *old_tp;
+	struct trace_uprobe *old_tu;
 	int ret;
 
 	mutex_lock(&uprobe_lock);
 
 	/* register as an event */
-	old_tp = find_probe_event(tu->call.name, tu->call.class->system);
-	if (old_tp) {
+	old_tu = find_probe_event(tu->tp.call.name, tu->tp.call.class->system);
+	if (old_tu) {
 		/* delete old event */
-		ret = unregister_trace_uprobe(old_tp);
+		ret = unregister_trace_uprobe(old_tu);
 		if (ret)
 			goto end;
 	}
@@ -360,34 +355,36 @@ static int create_trace_uprobe(int argc, char **argv)
 	/* parse arguments */
 	ret = 0;
 	for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) {
+		struct probe_arg *parg = &tu->tp.args[i];
+
 		/* Increment count for freeing args in error case */
-		tu->nr_args++;
+		tu->tp.nr_args++;
 
 		/* Parse argument name */
 		arg = strchr(argv[i], '=');
 		if (arg) {
 			*arg++ = '\0';
-			tu->args[i].name = kstrdup(argv[i], GFP_KERNEL);
+			parg->name = kstrdup(argv[i], GFP_KERNEL);
 		} else {
 			arg = argv[i];
 			/* If argument name is omitted, set "argN" */
 			snprintf(buf, MAX_EVENT_NAME_LEN, "arg%d", i + 1);
-			tu->args[i].name = kstrdup(buf, GFP_KERNEL);
+			parg->name = kstrdup(buf, GFP_KERNEL);
 		}
 
-		if (!tu->args[i].name) {
+		if (!parg->name) {
 			pr_info("Failed to allocate argument[%d] name.\n", i);
 			ret = -ENOMEM;
 			goto error;
 		}
 
-		if (!is_good_name(tu->args[i].name)) {
-			pr_info("Invalid argument[%d] name: %s\n", i, tu->args[i].name);
+		if (!is_good_name(parg->name)) {
+			pr_info("Invalid argument[%d] name: %s\n", i, parg->name);
 			ret = -EINVAL;
 			goto error;
 		}
 
-		if (traceprobe_conflict_field_name(tu->args[i].name, tu->args, i)) {
+		if (traceprobe_conflict_field_name(parg->name, tu->tp.args, i)) {
 			pr_info("Argument[%d] name '%s' conflicts with "
 				"another field.\n", i, argv[i]);
 			ret = -EINVAL;
@@ -395,7 +392,8 @@ static int create_trace_uprobe(int argc, char **argv)
 		}
 
 		/* Parse fetch argument */
-		ret = traceprobe_parse_probe_arg(arg, &tu->size, &tu->args[i], false, false);
+		ret = traceprobe_parse_probe_arg(arg, &tu->tp.size, parg,
+						 false, false);
 		if (ret) {
 			pr_info("Parse error at argument[%d]. (%d)\n", i, ret);
 			goto error;
@@ -459,11 +457,11 @@ static int probes_seq_show(struct seq_file *m, void *v)
 	char c = is_ret_probe(tu) ? 'r' : 'p';
 	int i;
 
-	seq_printf(m, "%c:%s/%s", c, tu->call.class->system, tu->call.name);
+	seq_printf(m, "%c:%s/%s", c, tu->tp.call.class->system, tu->tp.call.name);
 	seq_printf(m, " %s:0x%p", tu->filename, (void *)tu->offset);
 
-	for (i = 0; i < tu->nr_args; i++)
-		seq_printf(m, " %s=%s", tu->args[i].name, tu->args[i].comm);
+	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_printf(m, "\n");
 	return 0;
@@ -509,7 +507,7 @@ static int probes_profile_seq_show(struct seq_file *m, void *v)
 {
 	struct trace_uprobe *tu = v;
 
-	seq_printf(m, "  %s %-44s %15lu\n", tu->filename, tu->call.name, tu->nhit);
+	seq_printf(m, "  %s %-44s %15lu\n", tu->filename, tu->tp.call.name, tu->nhit);
 	return 0;
 }
 
@@ -541,11 +539,11 @@ static void uprobe_trace_print(struct trace_uprobe *tu,
 	struct ring_buffer *buffer;
 	void *data;
 	int size, i;
-	struct ftrace_event_call *call = &tu->call;
+	struct ftrace_event_call *call = &tu->tp.call;
 
 	size = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
 	event = trace_current_buffer_lock_reserve(&buffer, call->event.type,
-						  size + tu->size, 0, 0);
+						  size + tu->tp.size, 0, 0);
 	if (!event)
 		return;
 
@@ -559,8 +557,10 @@ static void uprobe_trace_print(struct trace_uprobe *tu,
 		data = DATAOF_TRACE_ENTRY(entry, false);
 	}
 
-	for (i = 0; i < tu->nr_args; i++)
-		call_fetch(&tu->args[i].fetch, regs, data + tu->args[i].offset);
+	for (i = 0; i < tu->tp.nr_args; i++) {
+		call_fetch(&tu->tp.args[i].fetch, regs,
+			   data + tu->tp.args[i].offset);
+	}
 
 	if (!call_filter_check_discard(call, entry, buffer, event))
 		trace_buffer_unlock_commit(buffer, event, 0, 0);
@@ -591,23 +591,24 @@ print_uprobe_event(struct trace_iterator *iter, int flags, struct trace_event *e
 	int i;
 
 	entry = (struct uprobe_trace_entry_head *)iter->ent;
-	tu = container_of(event, struct trace_uprobe, call.event);
+	tu = container_of(event, struct trace_uprobe, tp.call.event);
 
 	if (is_ret_probe(tu)) {
-		if (!trace_seq_printf(s, "%s: (0x%lx <- 0x%lx)", tu->call.name,
+		if (!trace_seq_printf(s, "%s: (0x%lx <- 0x%lx)", tu->tp.call.name,
 					entry->vaddr[1], entry->vaddr[0]))
 			goto partial;
 		data = DATAOF_TRACE_ENTRY(entry, true);
 	} else {
-		if (!trace_seq_printf(s, "%s: (0x%lx)", tu->call.name,
+		if (!trace_seq_printf(s, "%s: (0x%lx)", tu->tp.call.name,
 					entry->vaddr[0]))
 			goto partial;
 		data = DATAOF_TRACE_ENTRY(entry, false);
 	}
 
-	for (i = 0; i < tu->nr_args; i++) {
-		if (!tu->args[i].type->print(s, tu->args[i].name,
-					     data + tu->args[i].offset, entry))
+	for (i = 0; i < tu->tp.nr_args; i++) {
+		struct probe_arg *parg = &tu->tp.args[i];
+
+		if (!parg->type->print(s, parg->name, data + parg->offset, entry))
 			goto partial;
 	}
 
@@ -618,11 +619,6 @@ partial:
 	return TRACE_TYPE_PARTIAL_LINE;
 }
 
-static inline bool is_trace_uprobe_enabled(struct trace_uprobe *tu)
-{
-	return tu->flags & (TP_FLAG_TRACE | TP_FLAG_PROFILE);
-}
-
 typedef bool (*filter_func_t)(struct uprobe_consumer *self,
 				enum uprobe_filter_ctx ctx,
 				struct mm_struct *mm);
@@ -632,29 +628,29 @@ probe_event_enable(struct trace_uprobe *tu, int flag, filter_func_t filter)
 {
 	int ret = 0;
 
-	if (is_trace_uprobe_enabled(tu))
+	if (trace_probe_is_enabled(&tu->tp))
 		return -EINTR;
 
 	WARN_ON(!uprobe_filter_is_empty(&tu->filter));
 
-	tu->flags |= flag;
+	tu->tp.flags |= flag;
 	tu->consumer.filter = filter;
 	ret = uprobe_register(tu->inode, tu->offset, &tu->consumer);
 	if (ret)
-		tu->flags &= ~flag;
+		tu->tp.flags &= ~flag;
 
 	return ret;
 }
 
 static void probe_event_disable(struct trace_uprobe *tu, int flag)
 {
-	if (!is_trace_uprobe_enabled(tu))
+	if (!trace_probe_is_enabled(&tu->tp))
 		return;
 
 	WARN_ON(!uprobe_filter_is_empty(&tu->filter));
 
 	uprobe_unregister(tu->inode, tu->offset, &tu->consumer);
-	tu->flags &= ~flag;
+	tu->tp.flags &= ~flag;
 }
 
 static int uprobe_event_define_fields(struct ftrace_event_call *event_call)
@@ -672,12 +668,12 @@ static int uprobe_event_define_fields(struct ftrace_event_call *event_call)
 		size = SIZEOF_TRACE_ENTRY(false);
 	}
 	/* Set argument names as fields */
-	for (i = 0; i < tu->nr_args; i++) {
-		ret = trace_define_field(event_call, tu->args[i].type->fmttype,
-					 tu->args[i].name,
-					 size + tu->args[i].offset,
-					 tu->args[i].type->size,
-					 tu->args[i].type->is_signed,
+	for (i = 0; i < tu->tp.nr_args; i++) {
+		struct probe_arg *parg = &tu->tp.args[i];
+
+		ret = trace_define_field(event_call, parg->type->fmttype,
+					 parg->name, size + parg->offset,
+					 parg->type->size, parg->type->is_signed,
 					 FILTER_OTHER);
 
 		if (ret)
@@ -705,16 +701,16 @@ static int __set_print_fmt(struct trace_uprobe *tu, char *buf, int len)
 
 	pos += snprintf(buf + pos, LEN_OR_ZERO, "\"%s", fmt);
 
-	for (i = 0; i < tu->nr_args; i++) {
+	for (i = 0; i < tu->tp.nr_args; i++) {
 		pos += snprintf(buf + pos, LEN_OR_ZERO, " %s=%s",
-				tu->args[i].name, tu->args[i].type->fmt);
+				tu->tp.args[i].name, tu->tp.args[i].type->fmt);
 	}
 
 	pos += snprintf(buf + pos, LEN_OR_ZERO, "\", %s", arg);
 
-	for (i = 0; i < tu->nr_args; i++) {
+	for (i = 0; i < tu->tp.nr_args; i++) {
 		pos += snprintf(buf + pos, LEN_OR_ZERO, ", REC->%s",
-				tu->args[i].name);
+				tu->tp.args[i].name);
 	}
 
 	return pos;	/* return the length of print_fmt */
@@ -734,7 +730,7 @@ static int set_print_fmt(struct trace_uprobe *tu)
 
 	/* Second: actually write the @print_fmt */
 	__set_print_fmt(tu, print_fmt, len + 1);
-	tu->call.print_fmt = print_fmt;
+	tu->tp.call.print_fmt = print_fmt;
 
 	return 0;
 }
@@ -831,14 +827,14 @@ static bool uprobe_perf_filter(struct uprobe_consumer *uc,
 static void uprobe_perf_print(struct trace_uprobe *tu,
 				unsigned long func, struct pt_regs *regs)
 {
-	struct ftrace_event_call *call = &tu->call;
+	struct ftrace_event_call *call = &tu->tp.call;
 	struct uprobe_trace_entry_head *entry;
 	struct hlist_head *head;
 	void *data;
 	int size, rctx, i;
 
 	size = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
-	size = ALIGN(size + tu->size + sizeof(u32), sizeof(u64)) - sizeof(u32);
+	size = ALIGN(size + tu->tp.size + sizeof(u32), sizeof(u64)) - sizeof(u32);
 
 	preempt_disable();
 	head = this_cpu_ptr(call->perf_events);
@@ -858,8 +854,11 @@ static void uprobe_perf_print(struct trace_uprobe *tu,
 		data = DATAOF_TRACE_ENTRY(entry, false);
 	}
 
-	for (i = 0; i < tu->nr_args; i++)
-		call_fetch(&tu->args[i].fetch, regs, data + tu->args[i].offset);
+	for (i = 0; i < tu->tp.nr_args; i++) {
+		struct probe_arg *parg = &tu->tp.args[i];
+
+		call_fetch(&parg->fetch, regs, data + parg->offset);
+	}
 
 	perf_trace_buf_submit(entry, size, rctx, 0, 1, regs, head, NULL);
  out:
@@ -926,11 +925,11 @@ static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *regs)
 	tu = container_of(con, struct trace_uprobe, consumer);
 	tu->nhit++;
 
-	if (tu->flags & TP_FLAG_TRACE)
+	if (tu->tp.flags & TP_FLAG_TRACE)
 		ret |= uprobe_trace_func(tu, regs);
 
 #ifdef CONFIG_PERF_EVENTS
-	if (tu->flags & TP_FLAG_PROFILE)
+	if (tu->tp.flags & TP_FLAG_PROFILE)
 		ret |= uprobe_perf_func(tu, regs);
 #endif
 	return ret;
@@ -943,11 +942,11 @@ static int uretprobe_dispatcher(struct uprobe_consumer *con,
 
 	tu = container_of(con, struct trace_uprobe, consumer);
 
-	if (tu->flags & TP_FLAG_TRACE)
+	if (tu->tp.flags & TP_FLAG_TRACE)
 		uretprobe_trace_func(tu, func, regs);
 
 #ifdef CONFIG_PERF_EVENTS
-	if (tu->flags & TP_FLAG_PROFILE)
+	if (tu->tp.flags & TP_FLAG_PROFILE)
 		uretprobe_perf_func(tu, func, regs);
 #endif
 	return 0;
@@ -959,7 +958,7 @@ static struct trace_event_functions uprobe_funcs = {
 
 static int register_uprobe_event(struct trace_uprobe *tu)
 {
-	struct ftrace_event_call *call = &tu->call;
+	struct ftrace_event_call *call = &tu->tp.call;
 	int ret;
 
 	/* Initialize ftrace_event_call */
@@ -994,11 +993,11 @@ static int unregister_uprobe_event(struct trace_uprobe *tu)
 	int ret;
 
 	/* tu->event is unregistered in trace_remove_event_call() */
-	ret = trace_remove_event_call(&tu->call);
+	ret = trace_remove_event_call(&tu->tp.call);
 	if (ret)
 		return ret;
-	kfree(tu->call.print_fmt);
-	tu->call.print_fmt = NULL;
+	kfree(tu->tp.call.print_fmt);
+	tu->tp.call.print_fmt = NULL;
 	return 0;
 }
 
-- 
cgit v1.2.3-70-g09d2


From 5bf652aaf46ca6ae477ea0d162e68d577cf244aa Mon Sep 17 00:00:00 2001
From: Namhyung Kim <namhyung.kim@lge.com>
Date: Wed, 3 Jul 2013 16:09:02 +0900
Subject: tracing/probes: Integrate duplicate set_print_fmt()

The set_print_fmt() functions are implemented almost same for
[ku]probes.  Move it to a common place and get rid of the duplication.

Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 kernel/trace/trace_kprobe.c | 63 +--------------------------------------------
 kernel/trace/trace_probe.c  | 62 ++++++++++++++++++++++++++++++++++++++++++++
 kernel/trace/trace_probe.h  |  2 ++
 kernel/trace/trace_uprobe.c | 55 +--------------------------------------
 4 files changed, 66 insertions(+), 116 deletions(-)

(limited to 'kernel/trace/trace_uprobe.c')

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index fb1a02735d6..c9ffdafb9ad 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -964,67 +964,6 @@ static int kretprobe_event_define_fields(struct ftrace_event_call *event_call)
 	return 0;
 }
 
-static int __set_print_fmt(struct trace_kprobe *tk, char *buf, int len)
-{
-	int i;
-	int pos = 0;
-
-	const char *fmt, *arg;
-
-	if (!trace_kprobe_is_return(tk)) {
-		fmt = "(%lx)";
-		arg = "REC->" FIELD_STRING_IP;
-	} else {
-		fmt = "(%lx <- %lx)";
-		arg = "REC->" FIELD_STRING_FUNC ", REC->" FIELD_STRING_RETIP;
-	}
-
-	/* When len=0, we just calculate the needed length */
-#define LEN_OR_ZERO (len ? len - pos : 0)
-
-	pos += snprintf(buf + pos, LEN_OR_ZERO, "\"%s", fmt);
-
-	for (i = 0; i < tk->tp.nr_args; i++) {
-		pos += snprintf(buf + pos, LEN_OR_ZERO, " %s=%s",
-				tk->tp.args[i].name, tk->tp.args[i].type->fmt);
-	}
-
-	pos += snprintf(buf + pos, LEN_OR_ZERO, "\", %s", arg);
-
-	for (i = 0; i < tk->tp.nr_args; i++) {
-		if (strcmp(tk->tp.args[i].type->name, "string") == 0)
-			pos += snprintf(buf + pos, LEN_OR_ZERO,
-					", __get_str(%s)",
-					tk->tp.args[i].name);
-		else
-			pos += snprintf(buf + pos, LEN_OR_ZERO, ", REC->%s",
-					tk->tp.args[i].name);
-	}
-
-#undef LEN_OR_ZERO
-
-	/* return the length of print_fmt */
-	return pos;
-}
-
-static int set_print_fmt(struct trace_kprobe *tk)
-{
-	int len;
-	char *print_fmt;
-
-	/* First: called with 0 length to calculate the needed length */
-	len = __set_print_fmt(tk, NULL, 0);
-	print_fmt = kmalloc(len + 1, GFP_KERNEL);
-	if (!print_fmt)
-		return -ENOMEM;
-
-	/* Second: actually write the @print_fmt */
-	__set_print_fmt(tk, print_fmt, len + 1);
-	tk->tp.call.print_fmt = print_fmt;
-
-	return 0;
-}
-
 #ifdef CONFIG_PERF_EVENTS
 
 /* Kprobe profile handler */
@@ -1175,7 +1114,7 @@ static int register_kprobe_event(struct trace_kprobe *tk)
 		call->event.funcs = &kprobe_funcs;
 		call->class->define_fields = kprobe_event_define_fields;
 	}
-	if (set_print_fmt(tk) < 0)
+	if (set_print_fmt(&tk->tp, trace_kprobe_is_return(tk)) < 0)
 		return -ENOMEM;
 	ret = register_ftrace_event(&call->event);
 	if (!ret) {
diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index 430505b08a6..d8347b01ce8 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -837,3 +837,65 @@ out:
 
 	return ret;
 }
+
+static int __set_print_fmt(struct trace_probe *tp, char *buf, int len,
+			   bool is_return)
+{
+	int i;
+	int pos = 0;
+
+	const char *fmt, *arg;
+
+	if (!is_return) {
+		fmt = "(%lx)";
+		arg = "REC->" FIELD_STRING_IP;
+	} else {
+		fmt = "(%lx <- %lx)";
+		arg = "REC->" FIELD_STRING_FUNC ", REC->" FIELD_STRING_RETIP;
+	}
+
+	/* When len=0, we just calculate the needed length */
+#define LEN_OR_ZERO (len ? len - pos : 0)
+
+	pos += snprintf(buf + pos, LEN_OR_ZERO, "\"%s", fmt);
+
+	for (i = 0; i < tp->nr_args; i++) {
+		pos += snprintf(buf + pos, LEN_OR_ZERO, " %s=%s",
+				tp->args[i].name, tp->args[i].type->fmt);
+	}
+
+	pos += snprintf(buf + pos, LEN_OR_ZERO, "\", %s", arg);
+
+	for (i = 0; i < tp->nr_args; i++) {
+		if (strcmp(tp->args[i].type->name, "string") == 0)
+			pos += snprintf(buf + pos, LEN_OR_ZERO,
+					", __get_str(%s)",
+					tp->args[i].name);
+		else
+			pos += snprintf(buf + pos, LEN_OR_ZERO, ", REC->%s",
+					tp->args[i].name);
+	}
+
+#undef LEN_OR_ZERO
+
+	/* return the length of print_fmt */
+	return pos;
+}
+
+int set_print_fmt(struct trace_probe *tp, bool is_return)
+{
+	int len;
+	char *print_fmt;
+
+	/* First: called with 0 length to calculate the needed length */
+	len = __set_print_fmt(tp, NULL, 0, is_return);
+	print_fmt = kmalloc(len + 1, GFP_KERNEL);
+	if (!print_fmt)
+		return -ENOMEM;
+
+	/* Second: actually write the @print_fmt */
+	__set_print_fmt(tp, print_fmt, len + 1, is_return);
+	tp->call.print_fmt = print_fmt;
+
+	return 0;
+}
diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
index d384fbd4025..2c979cb6636 100644
--- a/kernel/trace/trace_probe.h
+++ b/kernel/trace/trace_probe.h
@@ -226,3 +226,5 @@ store_trace_args(int ent_size, struct trace_probe *tp, struct pt_regs *regs,
 				   data + tp->args[i].offset);
 	}
 }
+
+extern int set_print_fmt(struct trace_probe *tp, bool is_return);
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index afda3726f28..b233d9cb121 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -682,59 +682,6 @@ static int uprobe_event_define_fields(struct ftrace_event_call *event_call)
 	return 0;
 }
 
-#define LEN_OR_ZERO		(len ? len - pos : 0)
-static int __set_print_fmt(struct trace_uprobe *tu, char *buf, int len)
-{
-	const char *fmt, *arg;
-	int i;
-	int pos = 0;
-
-	if (is_ret_probe(tu)) {
-		fmt = "(%lx <- %lx)";
-		arg = "REC->" FIELD_STRING_FUNC ", REC->" FIELD_STRING_RETIP;
-	} else {
-		fmt = "(%lx)";
-		arg = "REC->" FIELD_STRING_IP;
-	}
-
-	/* When len=0, we just calculate the needed length */
-
-	pos += snprintf(buf + pos, LEN_OR_ZERO, "\"%s", fmt);
-
-	for (i = 0; i < tu->tp.nr_args; i++) {
-		pos += snprintf(buf + pos, LEN_OR_ZERO, " %s=%s",
-				tu->tp.args[i].name, tu->tp.args[i].type->fmt);
-	}
-
-	pos += snprintf(buf + pos, LEN_OR_ZERO, "\", %s", arg);
-
-	for (i = 0; i < tu->tp.nr_args; i++) {
-		pos += snprintf(buf + pos, LEN_OR_ZERO, ", REC->%s",
-				tu->tp.args[i].name);
-	}
-
-	return pos;	/* return the length of print_fmt */
-}
-#undef LEN_OR_ZERO
-
-static int set_print_fmt(struct trace_uprobe *tu)
-{
-	char *print_fmt;
-	int len;
-
-	/* First: called with 0 length to calculate the needed length */
-	len = __set_print_fmt(tu, NULL, 0);
-	print_fmt = kmalloc(len + 1, GFP_KERNEL);
-	if (!print_fmt)
-		return -ENOMEM;
-
-	/* Second: actually write the @print_fmt */
-	__set_print_fmt(tu, print_fmt, len + 1);
-	tu->tp.call.print_fmt = print_fmt;
-
-	return 0;
-}
-
 #ifdef CONFIG_PERF_EVENTS
 static bool
 __uprobe_perf_filter(struct trace_uprobe_filter *filter, struct mm_struct *mm)
@@ -966,7 +913,7 @@ static int register_uprobe_event(struct trace_uprobe *tu)
 	call->event.funcs = &uprobe_funcs;
 	call->class->define_fields = uprobe_event_define_fields;
 
-	if (set_print_fmt(tu) < 0)
+	if (set_print_fmt(&tu->tp, is_ret_probe(tu)) < 0)
 		return -ENOMEM;
 
 	ret = register_ftrace_event(&call->event);
-- 
cgit v1.2.3-70-g09d2


From 34fee3a104cea1c4b658e51836e4bcd99bd76c70 Mon Sep 17 00:00:00 2001
From: Namhyung Kim <namhyung.kim@lge.com>
Date: Tue, 26 Nov 2013 14:56:28 +0900
Subject: tracing/probes: Split [ku]probes_fetch_type_table

Use separate fetch_type_table for kprobes and uprobes.  It currently
shares all fetch methods but some of them will be implemented
differently later.

This is not to break build if [ku]probes is configured alone (like
!CONFIG_KPROBE_EVENT and CONFIG_UPROBE_EVENT).  So I added '__weak'
to the table declaration so that it can be safely omitted when it
configured out.

Acked-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 kernel/trace/trace_kprobe.c | 20 ++++++++++++++
 kernel/trace/trace_probe.c  | 65 ++++++++++++++++++---------------------------
 kernel/trace/trace_probe.h  | 53 ++++++++++++++++++++++++++++++++++++
 kernel/trace/trace_uprobe.c | 20 ++++++++++++++
 4 files changed, 119 insertions(+), 39 deletions(-)

(limited to 'kernel/trace/trace_uprobe.c')

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index c9ffdafb9ad..fe3f00c381c 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -88,6 +88,26 @@ static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs);
 static int kretprobe_dispatcher(struct kretprobe_instance *ri,
 				struct pt_regs *regs);
 
+/* Fetch type information table */
+const struct fetch_type kprobes_fetch_type_table[] = {
+	/* Special types */
+	[FETCH_TYPE_STRING] = __ASSIGN_FETCH_TYPE("string", string, string,
+					sizeof(u32), 1, "__data_loc char[]"),
+	[FETCH_TYPE_STRSIZE] = __ASSIGN_FETCH_TYPE("string_size", u32,
+					string_size, sizeof(u32), 0, "u32"),
+	/* Basic types */
+	ASSIGN_FETCH_TYPE(u8,  u8,  0),
+	ASSIGN_FETCH_TYPE(u16, u16, 0),
+	ASSIGN_FETCH_TYPE(u32, u32, 0),
+	ASSIGN_FETCH_TYPE(u64, u64, 0),
+	ASSIGN_FETCH_TYPE(s8,  u8,  1),
+	ASSIGN_FETCH_TYPE(s16, u16, 1),
+	ASSIGN_FETCH_TYPE(s32, u32, 1),
+	ASSIGN_FETCH_TYPE(s64, u64, 1),
+
+	ASSIGN_FETCH_TYPE_END
+};
+
 /*
  * Allocate new trace_probe and initialize it (including kprobes).
  */
diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index c26bc9eaa2a..541036ec739 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -54,10 +54,6 @@ DEFINE_BASIC_PRINT_TYPE_FUNC(s16, "%d")
 DEFINE_BASIC_PRINT_TYPE_FUNC(s32, "%d")
 DEFINE_BASIC_PRINT_TYPE_FUNC(s64, "%Ld")
 
-/* For defining macros, define string/string_size types */
-typedef u32 string;
-typedef u32 string_size;
-
 /* Print type function for string type */
 __kprobes int PRINT_TYPE_FUNC_NAME(string)(struct trace_seq *s,
 						  const char *name,
@@ -74,7 +70,6 @@ __kprobes int PRINT_TYPE_FUNC_NAME(string)(struct trace_seq *s,
 
 const char PRINT_TYPE_FMT_NAME(string)[] = "\\\"%s\\\"";
 
-#define FETCH_FUNC_NAME(method, type)	fetch_##method##_##type
 /*
  * Define macro for basic types - we don't need to define s* types, because
  * we have to care only about bitwidth at recording time.
@@ -359,25 +354,8 @@ free_bitfield_fetch_param(struct bitfield_fetch_param *data)
 	kfree(data);
 }
 
-/* Fetch type information table */
-static const struct fetch_type fetch_type_table[] = {
-	/* Special types */
-	[FETCH_TYPE_STRING] = __ASSIGN_FETCH_TYPE("string", string, string,
-					sizeof(u32), 1, "__data_loc char[]"),
-	[FETCH_TYPE_STRSIZE] = __ASSIGN_FETCH_TYPE("string_size", u32,
-					string_size, sizeof(u32), 0, "u32"),
-	/* Basic types */
-	ASSIGN_FETCH_TYPE(u8,  u8,  0),
-	ASSIGN_FETCH_TYPE(u16, u16, 0),
-	ASSIGN_FETCH_TYPE(u32, u32, 0),
-	ASSIGN_FETCH_TYPE(u64, u64, 0),
-	ASSIGN_FETCH_TYPE(s8,  u8,  1),
-	ASSIGN_FETCH_TYPE(s16, u16, 1),
-	ASSIGN_FETCH_TYPE(s32, u32, 1),
-	ASSIGN_FETCH_TYPE(s64, u64, 1),
-};
-
-static const struct fetch_type *find_fetch_type(const char *type)
+static const struct fetch_type *find_fetch_type(const char *type,
+						const struct fetch_type *ftbl)
 {
 	int i;
 
@@ -398,21 +376,22 @@ static const struct fetch_type *find_fetch_type(const char *type)
 
 		switch (bs) {
 		case 8:
-			return find_fetch_type("u8");
+			return find_fetch_type("u8", ftbl);
 		case 16:
-			return find_fetch_type("u16");
+			return find_fetch_type("u16", ftbl);
 		case 32:
-			return find_fetch_type("u32");
+			return find_fetch_type("u32", ftbl);
 		case 64:
-			return find_fetch_type("u64");
+			return find_fetch_type("u64", ftbl);
 		default:
 			goto fail;
 		}
 	}
 
-	for (i = 0; i < ARRAY_SIZE(fetch_type_table); i++)
-		if (strcmp(type, fetch_type_table[i].name) == 0)
-			return &fetch_type_table[i];
+	for (i = 0; ftbl[i].name; i++) {
+		if (strcmp(type, ftbl[i].name) == 0)
+			return &ftbl[i];
+	}
 
 fail:
 	return NULL;
@@ -426,16 +405,17 @@ static __kprobes void fetch_stack_address(struct pt_regs *regs,
 }
 
 static fetch_func_t get_fetch_size_function(const struct fetch_type *type,
-					fetch_func_t orig_fn)
+					    fetch_func_t orig_fn,
+					    const struct fetch_type *ftbl)
 {
 	int i;
 
-	if (type != &fetch_type_table[FETCH_TYPE_STRING])
+	if (type != &ftbl[FETCH_TYPE_STRING])
 		return NULL;	/* Only string type needs size function */
 
 	for (i = 0; i < FETCH_MTD_END; i++)
 		if (type->fetch[i] == orig_fn)
-			return fetch_type_table[FETCH_TYPE_STRSIZE].fetch[i];
+			return ftbl[FETCH_TYPE_STRSIZE].fetch[i];
 
 	WARN_ON(1);	/* This should not happen */
 
@@ -504,12 +484,14 @@ static int parse_probe_vars(char *arg, const struct fetch_type *t,
 static int parse_probe_arg(char *arg, const struct fetch_type *t,
 		     struct fetch_param *f, bool is_return, bool is_kprobe)
 {
+	const struct fetch_type *ftbl;
 	unsigned long param;
 	long offset;
 	char *tmp;
-	int ret;
+	int ret = 0;
 
-	ret = 0;
+	ftbl = is_kprobe ? kprobes_fetch_type_table : uprobes_fetch_type_table;
+	BUG_ON(ftbl == NULL);
 
 	/* Until uprobe_events supports only reg arguments */
 	if (!is_kprobe && arg[0] != '%')
@@ -568,7 +550,7 @@ static int parse_probe_arg(char *arg, const struct fetch_type *t,
 			struct deref_fetch_param	*dprm;
 			const struct fetch_type		*t2;
 
-			t2 = find_fetch_type(NULL);
+			t2 = find_fetch_type(NULL, ftbl);
 			*tmp = '\0';
 			dprm = kzalloc(sizeof(struct deref_fetch_param), GFP_KERNEL);
 
@@ -637,9 +619,13 @@ static int __parse_bitfield_probe_arg(const char *bf,
 int traceprobe_parse_probe_arg(char *arg, ssize_t *size,
 		struct probe_arg *parg, bool is_return, bool is_kprobe)
 {
+	const struct fetch_type *ftbl;
 	const char *t;
 	int ret;
 
+	ftbl = is_kprobe ? kprobes_fetch_type_table : uprobes_fetch_type_table;
+	BUG_ON(ftbl == NULL);
+
 	if (strlen(arg) > MAX_ARGSTR_LEN) {
 		pr_info("Argument is too long.: %s\n",  arg);
 		return -ENOSPC;
@@ -654,7 +640,7 @@ int traceprobe_parse_probe_arg(char *arg, ssize_t *size,
 		arg[t - parg->comm] = '\0';
 		t++;
 	}
-	parg->type = find_fetch_type(t);
+	parg->type = find_fetch_type(t, ftbl);
 	if (!parg->type) {
 		pr_info("Unsupported type: %s\n", t);
 		return -EINVAL;
@@ -668,7 +654,8 @@ int traceprobe_parse_probe_arg(char *arg, ssize_t *size,
 
 	if (ret >= 0) {
 		parg->fetch_size.fn = get_fetch_size_function(parg->type,
-							      parg->fetch.fn);
+							      parg->fetch.fn,
+							      ftbl);
 		parg->fetch_size.data = parg->fetch.data;
 	}
 
diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
index bd621c08b6c..5b77798d113 100644
--- a/kernel/trace/trace_probe.h
+++ b/kernel/trace/trace_probe.h
@@ -126,6 +126,10 @@ struct fetch_param {
 	void 			*data;
 };
 
+/* For defining macros, define string/string_size types */
+typedef u32 string;
+typedef u32 string_size;
+
 #define PRINT_TYPE_FUNC_NAME(type)	print_type_##type
 #define PRINT_TYPE_FMT_NAME(type)	print_type_format_##type
 
@@ -146,6 +150,47 @@ DECLARE_BASIC_PRINT_TYPE_FUNC(s32);
 DECLARE_BASIC_PRINT_TYPE_FUNC(s64);
 DECLARE_BASIC_PRINT_TYPE_FUNC(string);
 
+#define FETCH_FUNC_NAME(method, type)	fetch_##method##_##type
+
+/* Declare macro for basic types */
+#define DECLARE_FETCH_FUNC(method, type)				\
+extern void FETCH_FUNC_NAME(method, type)(struct pt_regs *regs, 	\
+					  void *data, void *dest)
+
+#define DECLARE_BASIC_FETCH_FUNCS(method) 	\
+DECLARE_FETCH_FUNC(method, u8);			\
+DECLARE_FETCH_FUNC(method, u16);		\
+DECLARE_FETCH_FUNC(method, u32);		\
+DECLARE_FETCH_FUNC(method, u64)
+
+DECLARE_BASIC_FETCH_FUNCS(reg);
+#define fetch_reg_string			NULL
+#define fetch_reg_string_size			NULL
+
+DECLARE_BASIC_FETCH_FUNCS(stack);
+#define fetch_stack_string			NULL
+#define fetch_stack_string_size			NULL
+
+DECLARE_BASIC_FETCH_FUNCS(retval);
+#define fetch_retval_string			NULL
+#define fetch_retval_string_size		NULL
+
+DECLARE_BASIC_FETCH_FUNCS(memory);
+DECLARE_FETCH_FUNC(memory, string);
+DECLARE_FETCH_FUNC(memory, string_size);
+
+DECLARE_BASIC_FETCH_FUNCS(symbol);
+DECLARE_FETCH_FUNC(symbol, string);
+DECLARE_FETCH_FUNC(symbol, string_size);
+
+DECLARE_BASIC_FETCH_FUNCS(deref);
+DECLARE_FETCH_FUNC(deref, string);
+DECLARE_FETCH_FUNC(deref, string_size);
+
+DECLARE_BASIC_FETCH_FUNCS(bitfield);
+#define fetch_bitfield_string			NULL
+#define fetch_bitfield_string_size		NULL
+
 /* Default (unsigned long) fetch type */
 #define __DEFAULT_FETCH_TYPE(t) u##t
 #define _DEFAULT_FETCH_TYPE(t) __DEFAULT_FETCH_TYPE(t)
@@ -176,9 +221,17 @@ ASSIGN_FETCH_FUNC(bitfield, ftype),			\
 #define ASSIGN_FETCH_TYPE(ptype, ftype, sign)			\
 	__ASSIGN_FETCH_TYPE(#ptype, ptype, ftype, sizeof(ftype), sign, #ptype)
 
+#define ASSIGN_FETCH_TYPE_END {}
+
 #define FETCH_TYPE_STRING	0
 #define FETCH_TYPE_STRSIZE	1
 
+/*
+ * Fetch type information table.
+ * It's declared as a weak symbol due to conditional compilation.
+ */
+extern __weak const struct fetch_type kprobes_fetch_type_table[];
+extern __weak const struct fetch_type uprobes_fetch_type_table[];
 
 struct probe_arg {
 	struct fetch_param	fetch;
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index b233d9cb121..2c60925ea07 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -74,6 +74,26 @@ 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);
 
+/* Fetch type information table */
+const struct fetch_type uprobes_fetch_type_table[] = {
+	/* Special types */
+	[FETCH_TYPE_STRING] = __ASSIGN_FETCH_TYPE("string", string, string,
+					sizeof(u32), 1, "__data_loc char[]"),
+	[FETCH_TYPE_STRSIZE] = __ASSIGN_FETCH_TYPE("string_size", u32,
+					string_size, sizeof(u32), 0, "u32"),
+	/* Basic types */
+	ASSIGN_FETCH_TYPE(u8,  u8,  0),
+	ASSIGN_FETCH_TYPE(u16, u16, 0),
+	ASSIGN_FETCH_TYPE(u32, u32, 0),
+	ASSIGN_FETCH_TYPE(u64, u64, 0),
+	ASSIGN_FETCH_TYPE(s8,  u8,  1),
+	ASSIGN_FETCH_TYPE(s16, u16, 1),
+	ASSIGN_FETCH_TYPE(s32, u32, 1),
+	ASSIGN_FETCH_TYPE(s64, u64, 1),
+
+	ASSIGN_FETCH_TYPE_END
+};
+
 static inline void init_trace_uprobe_filter(struct trace_uprobe_filter *filter)
 {
 	rwlock_init(&filter->rwlock);
-- 
cgit v1.2.3-70-g09d2


From 3fd996a29515df23b3f20c36d69788a3707254a9 Mon Sep 17 00:00:00 2001
From: Namhyung Kim <namhyung.kim@lge.com>
Date: Tue, 26 Nov 2013 15:21:04 +0900
Subject: tracing/probes: Implement 'stack' fetch method for uprobes

Use separate method to fetch from stack.  Move existing functions to
trace_kprobe.c and make them static.  Also add new stack fetch
implementation for uprobes.

Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 kernel/trace/trace_kprobe.c | 15 +++++++++++++++
 kernel/trace/trace_probe.c  | 22 ----------------------
 kernel/trace/trace_probe.h  | 14 ++++++++++----
 kernel/trace/trace_uprobe.c | 41 +++++++++++++++++++++++++++++++++++++++++
 4 files changed, 66 insertions(+), 26 deletions(-)

(limited to 'kernel/trace/trace_uprobe.c')

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index fe3f00c381c..389f9e4744c 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -88,6 +88,21 @@ static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs);
 static int kretprobe_dispatcher(struct kretprobe_instance *ri,
 				struct pt_regs *regs);
 
+/*
+ * Kprobes-specific fetch functions
+ */
+#define DEFINE_FETCH_stack(type)					\
+static __kprobes void FETCH_FUNC_NAME(stack, type)(struct pt_regs *regs,\
+					  void *offset, void *dest)	\
+{									\
+	*(type *)dest = (type)regs_get_kernel_stack_nth(regs,		\
+				(unsigned int)((unsigned long)offset));	\
+}
+DEFINE_BASIC_FETCH_FUNCS(stack)
+/* No string on the stack entry */
+#define fetch_stack_string	NULL
+#define fetch_stack_string_size	NULL
+
 /* Fetch type information table */
 const struct fetch_type kprobes_fetch_type_table[] = {
 	/* Special types */
diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index 541036ec739..77aa7d18821 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -70,16 +70,6 @@ __kprobes int PRINT_TYPE_FUNC_NAME(string)(struct trace_seq *s,
 
 const char PRINT_TYPE_FMT_NAME(string)[] = "\\\"%s\\\"";
 
-/*
- * Define macro for basic types - we don't need to define s* types, because
- * we have to care only about bitwidth at recording time.
- */
-#define DEFINE_BASIC_FETCH_FUNCS(method) \
-DEFINE_FETCH_##method(u8)		\
-DEFINE_FETCH_##method(u16)		\
-DEFINE_FETCH_##method(u32)		\
-DEFINE_FETCH_##method(u64)
-
 #define CHECK_FETCH_FUNCS(method, fn)			\
 	(((FETCH_FUNC_NAME(method, u8) == fn) ||	\
 	  (FETCH_FUNC_NAME(method, u16) == fn) ||	\
@@ -102,18 +92,6 @@ DEFINE_BASIC_FETCH_FUNCS(reg)
 #define fetch_reg_string	NULL
 #define fetch_reg_string_size	NULL
 
-#define DEFINE_FETCH_stack(type)					\
-__kprobes void FETCH_FUNC_NAME(stack, type)(struct pt_regs *regs,	\
-					  void *offset, void *dest)	\
-{									\
-	*(type *)dest = (type)regs_get_kernel_stack_nth(regs,		\
-				(unsigned int)((unsigned long)offset));	\
-}
-DEFINE_BASIC_FETCH_FUNCS(stack)
-/* No string on the stack entry */
-#define fetch_stack_string	NULL
-#define fetch_stack_string_size	NULL
-
 #define DEFINE_FETCH_retval(type)					\
 __kprobes void FETCH_FUNC_NAME(retval, type)(struct pt_regs *regs,	\
 					  void *dummy, void *dest)	\
diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
index 5b77798d113..8211dd674ab 100644
--- a/kernel/trace/trace_probe.h
+++ b/kernel/trace/trace_probe.h
@@ -167,10 +167,6 @@ DECLARE_BASIC_FETCH_FUNCS(reg);
 #define fetch_reg_string			NULL
 #define fetch_reg_string_size			NULL
 
-DECLARE_BASIC_FETCH_FUNCS(stack);
-#define fetch_stack_string			NULL
-#define fetch_stack_string_size			NULL
-
 DECLARE_BASIC_FETCH_FUNCS(retval);
 #define fetch_retval_string			NULL
 #define fetch_retval_string_size		NULL
@@ -191,6 +187,16 @@ DECLARE_BASIC_FETCH_FUNCS(bitfield);
 #define fetch_bitfield_string			NULL
 #define fetch_bitfield_string_size		NULL
 
+/*
+ * Define macro for basic types - we don't need to define s* types, because
+ * we have to care only about bitwidth at recording time.
+ */
+#define DEFINE_BASIC_FETCH_FUNCS(method) \
+DEFINE_FETCH_##method(u8)		\
+DEFINE_FETCH_##method(u16)		\
+DEFINE_FETCH_##method(u32)		\
+DEFINE_FETCH_##method(u64)
+
 /* Default (unsigned long) fetch type */
 #define __DEFAULT_FETCH_TYPE(t) u##t
 #define _DEFAULT_FETCH_TYPE(t) __DEFAULT_FETCH_TYPE(t)
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 2c60925ea07..5395d37e5e7 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -74,6 +74,47 @@ 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
+ */
+#define DEFINE_FETCH_stack(type)					\
+static __kprobes void FETCH_FUNC_NAME(stack, type)(struct pt_regs *regs,\
+					  void *offset, void *dest)	\
+{									\
+	*(type *)dest = (type)get_user_stack_nth(regs,			\
+					      ((unsigned long)offset)); \
+}
+DEFINE_BASIC_FETCH_FUNCS(stack)
+/* No string on the stack entry */
+#define fetch_stack_string	NULL
+#define fetch_stack_string_size	NULL
+
+
 /* Fetch type information table */
 const struct fetch_type uprobes_fetch_type_table[] = {
 	/* Special types */
-- 
cgit v1.2.3-70-g09d2


From 1301a44e77557e928700f91c7083c5770054c212 Mon Sep 17 00:00:00 2001
From: Namhyung Kim <namhyung.kim@lge.com>
Date: Tue, 26 Nov 2013 15:21:04 +0900
Subject: tracing/probes: Move 'symbol' fetch method to kprobes

Move existing functions to trace_kprobe.c and add NULL entries to the
uprobes fetch type table.  I don't make them static since some generic
routines like update/free_XXX_fetch_param() require pointers to the
functions.

Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 kernel/trace/trace_kprobe.c | 59 +++++++++++++++++++++++++++++++++++++++++++++
 kernel/trace/trace_probe.c  | 59 ---------------------------------------------
 kernel/trace/trace_probe.h  | 24 ++++++++++++++++++
 kernel/trace/trace_uprobe.c |  8 ++++++
 4 files changed, 91 insertions(+), 59 deletions(-)

(limited to 'kernel/trace/trace_uprobe.c')

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 389f9e4744c..d2a4fd2fd8c 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -88,6 +88,51 @@ static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs);
 static int kretprobe_dispatcher(struct kretprobe_instance *ri,
 				struct pt_regs *regs);
 
+/* Memory fetching by symbol */
+struct symbol_cache {
+	char		*symbol;
+	long		offset;
+	unsigned long	addr;
+};
+
+unsigned long update_symbol_cache(struct symbol_cache *sc)
+{
+	sc->addr = (unsigned long)kallsyms_lookup_name(sc->symbol);
+
+	if (sc->addr)
+		sc->addr += sc->offset;
+
+	return sc->addr;
+}
+
+void free_symbol_cache(struct symbol_cache *sc)
+{
+	kfree(sc->symbol);
+	kfree(sc);
+}
+
+struct symbol_cache *alloc_symbol_cache(const char *sym, long offset)
+{
+	struct symbol_cache *sc;
+
+	if (!sym || strlen(sym) == 0)
+		return NULL;
+
+	sc = kzalloc(sizeof(struct symbol_cache), GFP_KERNEL);
+	if (!sc)
+		return NULL;
+
+	sc->symbol = kstrdup(sym, GFP_KERNEL);
+	if (!sc->symbol) {
+		kfree(sc);
+		return NULL;
+	}
+	sc->offset = offset;
+	update_symbol_cache(sc);
+
+	return sc;
+}
+
 /*
  * Kprobes-specific fetch functions
  */
@@ -103,6 +148,20 @@ DEFINE_BASIC_FETCH_FUNCS(stack)
 #define fetch_stack_string	NULL
 #define fetch_stack_string_size	NULL
 
+#define DEFINE_FETCH_symbol(type)					\
+__kprobes void FETCH_FUNC_NAME(symbol, type)(struct pt_regs *regs,	\
+					  void *data, void *dest)	\
+{									\
+	struct symbol_cache *sc = data;					\
+	if (sc->addr)							\
+		fetch_memory_##type(regs, (void *)sc->addr, dest);	\
+	else								\
+		*(type *)dest = 0;					\
+}
+DEFINE_BASIC_FETCH_FUNCS(symbol)
+DEFINE_FETCH_symbol(string)
+DEFINE_FETCH_symbol(string_size)
+
 /* Fetch type information table */
 const struct fetch_type kprobes_fetch_type_table[] = {
 	/* Special types */
diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index 77aa7d18821..a31ad478b7f 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -180,65 +180,6 @@ __kprobes void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs,
 		*(u32 *)dest = len;
 }
 
-/* Memory fetching by symbol */
-struct symbol_cache {
-	char		*symbol;
-	long		offset;
-	unsigned long	addr;
-};
-
-static unsigned long update_symbol_cache(struct symbol_cache *sc)
-{
-	sc->addr = (unsigned long)kallsyms_lookup_name(sc->symbol);
-
-	if (sc->addr)
-		sc->addr += sc->offset;
-
-	return sc->addr;
-}
-
-static void free_symbol_cache(struct symbol_cache *sc)
-{
-	kfree(sc->symbol);
-	kfree(sc);
-}
-
-static struct symbol_cache *alloc_symbol_cache(const char *sym, long offset)
-{
-	struct symbol_cache *sc;
-
-	if (!sym || strlen(sym) == 0)
-		return NULL;
-
-	sc = kzalloc(sizeof(struct symbol_cache), GFP_KERNEL);
-	if (!sc)
-		return NULL;
-
-	sc->symbol = kstrdup(sym, GFP_KERNEL);
-	if (!sc->symbol) {
-		kfree(sc);
-		return NULL;
-	}
-	sc->offset = offset;
-	update_symbol_cache(sc);
-
-	return sc;
-}
-
-#define DEFINE_FETCH_symbol(type)					\
-__kprobes void FETCH_FUNC_NAME(symbol, type)(struct pt_regs *regs,	\
-					  void *data, void *dest)	\
-{									\
-	struct symbol_cache *sc = data;					\
-	if (sc->addr)							\
-		fetch_memory_##type(regs, (void *)sc->addr, dest);	\
-	else								\
-		*(type *)dest = 0;					\
-}
-DEFINE_BASIC_FETCH_FUNCS(symbol)
-DEFINE_FETCH_symbol(string)
-DEFINE_FETCH_symbol(string_size)
-
 /* Dereference memory access function */
 struct deref_fetch_param {
 	struct fetch_param	orig;
diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
index 8211dd674ab..8be84550ceb 100644
--- a/kernel/trace/trace_probe.h
+++ b/kernel/trace/trace_probe.h
@@ -239,6 +239,30 @@ ASSIGN_FETCH_FUNC(bitfield, ftype),			\
 extern __weak const struct fetch_type kprobes_fetch_type_table[];
 extern __weak const struct fetch_type uprobes_fetch_type_table[];
 
+#ifdef CONFIG_KPROBE_EVENT
+struct symbol_cache;
+unsigned long update_symbol_cache(struct symbol_cache *sc);
+void free_symbol_cache(struct symbol_cache *sc);
+struct symbol_cache *alloc_symbol_cache(const char *sym, long offset);
+#else
+struct symbol_cache {
+};
+static inline unsigned long __used update_symbol_cache(struct symbol_cache *sc)
+{
+	return 0;
+}
+
+static inline void __used free_symbol_cache(struct symbol_cache *sc)
+{
+}
+
+static inline struct symbol_cache * __used
+alloc_symbol_cache(const char *sym, long offset)
+{
+	return NULL;
+}
+#endif /* CONFIG_KPROBE_EVENT */
+
 struct probe_arg {
 	struct fetch_param	fetch;
 	struct fetch_param	fetch_size;
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 5395d37e5e7..24ef6a33d93 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -115,6 +115,14 @@ DEFINE_BASIC_FETCH_FUNCS(stack)
 #define fetch_stack_string_size	NULL
 
 
+/* uprobes do not support symbol fetch methods */
+#define fetch_symbol_u8			NULL
+#define fetch_symbol_u16		NULL
+#define fetch_symbol_u32		NULL
+#define fetch_symbol_u64		NULL
+#define fetch_symbol_string		NULL
+#define fetch_symbol_string_size	NULL
+
 /* Fetch type information table */
 const struct fetch_type uprobes_fetch_type_table[] = {
 	/* Special types */
-- 
cgit v1.2.3-70-g09d2


From 5baaa59ef09e8729aef101f7bf7d9d0af00852e3 Mon Sep 17 00:00:00 2001
From: Namhyung Kim <namhyung.kim@lge.com>
Date: Tue, 26 Nov 2013 15:21:04 +0900
Subject: tracing/probes: Implement 'memory' fetch method for uprobes

Use separate method to fetch from memory.  Move existing functions to
trace_kprobe.c and make them static.  Also add new memory fetch
implementation for uprobes.

Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 kernel/trace/trace_kprobe.c | 77 +++++++++++++++++++++++++++++++++++++++++++++
 kernel/trace/trace_probe.c  | 77 ---------------------------------------------
 kernel/trace/trace_probe.h  |  4 ---
 kernel/trace/trace_uprobe.c | 52 ++++++++++++++++++++++++++++++
 4 files changed, 129 insertions(+), 81 deletions(-)

(limited to 'kernel/trace/trace_uprobe.c')

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index d2a4fd2fd8c..f94a56915e6 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -148,6 +148,83 @@ DEFINE_BASIC_FETCH_FUNCS(stack)
 #define fetch_stack_string	NULL
 #define fetch_stack_string_size	NULL
 
+#define DEFINE_FETCH_memory(type)					\
+static __kprobes void FETCH_FUNC_NAME(memory, type)(struct pt_regs *regs,\
+					  void *addr, void *dest)	\
+{									\
+	type retval;							\
+	if (probe_kernel_address(addr, retval))				\
+		*(type *)dest = 0;					\
+	else								\
+		*(type *)dest = retval;					\
+}
+DEFINE_BASIC_FETCH_FUNCS(memory)
+/*
+ * Fetch a null-terminated string. Caller MUST set *(u32 *)dest with max
+ * length and relative data location.
+ */
+static __kprobes void FETCH_FUNC_NAME(memory, string)(struct pt_regs *regs,
+						      void *addr, void *dest)
+{
+	long ret;
+	int maxlen = get_rloc_len(*(u32 *)dest);
+	u8 *dst = get_rloc_data(dest);
+	u8 *src = addr;
+	mm_segment_t old_fs = get_fs();
+
+	if (!maxlen)
+		return;
+
+	/*
+	 * Try to get string again, since the string can be changed while
+	 * probing.
+	 */
+	set_fs(KERNEL_DS);
+	pagefault_disable();
+
+	do
+		ret = __copy_from_user_inatomic(dst++, src++, 1);
+	while (dst[-1] && ret == 0 && src - (u8 *)addr < maxlen);
+
+	dst[-1] = '\0';
+	pagefault_enable();
+	set_fs(old_fs);
+
+	if (ret < 0) {	/* Failed to fetch string */
+		((u8 *)get_rloc_data(dest))[0] = '\0';
+		*(u32 *)dest = make_data_rloc(0, get_rloc_offs(*(u32 *)dest));
+	} else {
+		*(u32 *)dest = make_data_rloc(src - (u8 *)addr,
+					      get_rloc_offs(*(u32 *)dest));
+	}
+}
+
+/* Return the length of string -- including null terminal byte */
+static __kprobes void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs,
+							void *addr, void *dest)
+{
+	mm_segment_t old_fs;
+	int ret, len = 0;
+	u8 c;
+
+	old_fs = get_fs();
+	set_fs(KERNEL_DS);
+	pagefault_disable();
+
+	do {
+		ret = __copy_from_user_inatomic(&c, (u8 *)addr + len, 1);
+		len++;
+	} while (c && ret == 0 && len < MAX_STRING_SIZE);
+
+	pagefault_enable();
+	set_fs(old_fs);
+
+	if (ret < 0)	/* Failed to check the length */
+		*(u32 *)dest = 0;
+	else
+		*(u32 *)dest = len;
+}
+
 #define DEFINE_FETCH_symbol(type)					\
 __kprobes void FETCH_FUNC_NAME(symbol, type)(struct pt_regs *regs,	\
 					  void *data, void *dest)	\
diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index 8d7231d436d..8f7a2b6d389 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -103,83 +103,6 @@ DEFINE_BASIC_FETCH_FUNCS(retval)
 #define fetch_retval_string		NULL
 #define fetch_retval_string_size	NULL
 
-#define DEFINE_FETCH_memory(type)					\
-__kprobes void FETCH_FUNC_NAME(memory, type)(struct pt_regs *regs,	\
-					  void *addr, void *dest)	\
-{									\
-	type retval;							\
-	if (probe_kernel_address(addr, retval))				\
-		*(type *)dest = 0;					\
-	else								\
-		*(type *)dest = retval;					\
-}
-DEFINE_BASIC_FETCH_FUNCS(memory)
-/*
- * Fetch a null-terminated string. Caller MUST set *(u32 *)dest with max
- * length and relative data location.
- */
-__kprobes void FETCH_FUNC_NAME(memory, string)(struct pt_regs *regs,
-						      void *addr, void *dest)
-{
-	long ret;
-	int maxlen = get_rloc_len(*(u32 *)dest);
-	u8 *dst = get_rloc_data(dest);
-	u8 *src = addr;
-	mm_segment_t old_fs = get_fs();
-
-	if (!maxlen)
-		return;
-
-	/*
-	 * Try to get string again, since the string can be changed while
-	 * probing.
-	 */
-	set_fs(KERNEL_DS);
-	pagefault_disable();
-
-	do
-		ret = __copy_from_user_inatomic(dst++, src++, 1);
-	while (dst[-1] && ret == 0 && src - (u8 *)addr < maxlen);
-
-	dst[-1] = '\0';
-	pagefault_enable();
-	set_fs(old_fs);
-
-	if (ret < 0) {	/* Failed to fetch string */
-		((u8 *)get_rloc_data(dest))[0] = '\0';
-		*(u32 *)dest = make_data_rloc(0, get_rloc_offs(*(u32 *)dest));
-	} else {
-		*(u32 *)dest = make_data_rloc(src - (u8 *)addr,
-					      get_rloc_offs(*(u32 *)dest));
-	}
-}
-
-/* Return the length of string -- including null terminal byte */
-__kprobes void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs,
-							void *addr, void *dest)
-{
-	mm_segment_t old_fs;
-	int ret, len = 0;
-	u8 c;
-
-	old_fs = get_fs();
-	set_fs(KERNEL_DS);
-	pagefault_disable();
-
-	do {
-		ret = __copy_from_user_inatomic(&c, (u8 *)addr + len, 1);
-		len++;
-	} while (c && ret == 0 && len < MAX_STRING_SIZE);
-
-	pagefault_enable();
-	set_fs(old_fs);
-
-	if (ret < 0)	/* Failed to check the length */
-		*(u32 *)dest = 0;
-	else
-		*(u32 *)dest = len;
-}
-
 /* Dereference memory access function */
 struct deref_fetch_param {
 	struct fetch_param	orig;
diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
index 8be84550ceb..2d5b8f5f531 100644
--- a/kernel/trace/trace_probe.h
+++ b/kernel/trace/trace_probe.h
@@ -171,10 +171,6 @@ DECLARE_BASIC_FETCH_FUNCS(retval);
 #define fetch_retval_string			NULL
 #define fetch_retval_string_size		NULL
 
-DECLARE_BASIC_FETCH_FUNCS(memory);
-DECLARE_FETCH_FUNC(memory, string);
-DECLARE_FETCH_FUNC(memory, string_size);
-
 DECLARE_BASIC_FETCH_FUNCS(symbol);
 DECLARE_FETCH_FUNC(symbol, string);
 DECLARE_FETCH_FUNC(symbol, string_size);
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 24ef6a33d93..bebd2f5d9ea 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -114,6 +114,58 @@ DEFINE_BASIC_FETCH_FUNCS(stack)
 #define fetch_stack_string	NULL
 #define fetch_stack_string_size	NULL
 
+#define DEFINE_FETCH_memory(type)					\
+static __kprobes void FETCH_FUNC_NAME(memory, type)(struct pt_regs *regs,\
+						void *addr, void *dest) \
+{									\
+	type retval;							\
+	void __user *vaddr = (void __force __user *) addr;		\
+									\
+	if (copy_from_user(&retval, vaddr, sizeof(type)))		\
+		*(type *)dest = 0;					\
+	else								\
+		*(type *) dest = retval;				\
+}
+DEFINE_BASIC_FETCH_FUNCS(memory)
+/*
+ * Fetch a null-terminated string. Caller MUST set *(u32 *)dest with max
+ * length and relative data location.
+ */
+static __kprobes void FETCH_FUNC_NAME(memory, string)(struct pt_regs *regs,
+						      void *addr, void *dest)
+{
+	long ret;
+	u32 rloc = *(u32 *)dest;
+	int maxlen  = get_rloc_len(rloc);
+	u8 *dst = get_rloc_data(dest);
+	void __user *src = (void __force __user *) addr;
+
+	if (!maxlen)
+		return;
+
+	ret = strncpy_from_user(dst, src, maxlen);
+
+	if (ret < 0) {	/* Failed to fetch string */
+		((u8 *)get_rloc_data(dest))[0] = '\0';
+		*(u32 *)dest = make_data_rloc(0, get_rloc_offs(rloc));
+	} else {
+		*(u32 *)dest = make_data_rloc(ret, get_rloc_offs(rloc));
+	}
+}
+
+static __kprobes void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs,
+						      void *addr, void *dest)
+{
+	int len;
+	void __user *vaddr = (void __force __user *) addr;
+
+	len = strnlen_user(vaddr, MAX_STRING_SIZE);
+
+	if (len == 0 || len > MAX_STRING_SIZE)  /* Failed to check length */
+		*(u32 *)dest = 0;
+	else
+		*(u32 *)dest = len;
+}
 
 /* uprobes do not support symbol fetch methods */
 #define fetch_symbol_u8			NULL
-- 
cgit v1.2.3-70-g09d2


From a4734145a4771ffa0cd5ef283a5cfd03b30bedf3 Mon Sep 17 00:00:00 2001
From: Namhyung Kim <namhyung.kim@lge.com>
Date: Wed, 27 Nov 2013 11:36:47 +0900
Subject: tracing/uprobes: Pass 'is_return' to traceprobe_parse_probe_arg()

Currently uprobes don't pass is_return to the argument parser so that
it cannot make use of "$retval" fetch method since it only works for
return probes.

Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 kernel/trace/trace_uprobe.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'kernel/trace/trace_uprobe.c')

diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index bebd2f5d9ea..8bfd29a8d71 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -514,7 +514,7 @@ static int create_trace_uprobe(int argc, char **argv)
 
 		/* Parse fetch argument */
 		ret = traceprobe_parse_probe_arg(arg, &tu->tp.size, parg,
-						 false, false);
+						 is_return, false);
 		if (ret) {
 			pr_info("Parse error at argument[%d]. (%d)\n", i, ret);
 			goto error;
-- 
cgit v1.2.3-70-g09d2


From dcad1a204f72624796ae83359403898d10393b9c Mon Sep 17 00:00:00 2001
From: Namhyung Kim <namhyung.kim@lge.com>
Date: Wed, 3 Jul 2013 16:40:28 +0900
Subject: tracing/uprobes: Fetch args before reserving a ring buffer

Fetching from user space should be done in a non-atomic context.  So
use a per-cpu buffer and copy its content to the ring buffer
atomically.  Note that we can migrate during accessing user memory
thus use a per-cpu mutex to protect concurrent accesses.

This is needed since we'll be able to fetch args from an user memory
which can be swapped out.  Before that uprobes could fetch args from
registers only which saved in a kernel space.

While at it, use __get_data_size() and store_trace_args() to reduce
code duplication.  And add struct uprobe_cpu_buffer and its helpers as
suggested by Oleg.

Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 kernel/trace/trace_uprobe.c | 146 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 132 insertions(+), 14 deletions(-)

(limited to 'kernel/trace/trace_uprobe.c')

diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 8bfd29a8d71..794e8bc171f 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -652,21 +652,117 @@ static const struct file_operations uprobe_profile_ops = {
 	.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)
+{
+	BUG_ON(!mutex_is_locked(&event_mutex));
+
+	if (--uprobe_buffer_refcnt == 0) {
+		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_print(struct trace_uprobe *tu,
 				unsigned long func, struct pt_regs *regs)
 {
 	struct uprobe_trace_entry_head *entry;
 	struct ring_buffer_event *event;
 	struct ring_buffer *buffer;
+	struct uprobe_cpu_buffer *ucb;
 	void *data;
-	int size, i;
+	int size, dsize, esize;
 	struct ftrace_event_call *call = &tu->tp.call;
 
-	size = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
+	dsize = __get_data_size(&tu->tp, regs);
+	esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
+
+	if (WARN_ON_ONCE(!uprobe_cpu_buffer || tu->tp.size + dsize > PAGE_SIZE))
+		return;
+
+	ucb = uprobe_buffer_get();
+	store_trace_args(esize, &tu->tp, regs, ucb->buf, dsize);
+
+	size = esize + tu->tp.size + dsize;
 	event = trace_current_buffer_lock_reserve(&buffer, call->event.type,
-						  size + tu->tp.size, 0, 0);
+						  size, 0, 0);
 	if (!event)
-		return;
+		goto out;
 
 	entry = ring_buffer_event_data(event);
 	if (is_ret_probe(tu)) {
@@ -678,13 +774,13 @@ static void uprobe_trace_print(struct trace_uprobe *tu,
 		data = DATAOF_TRACE_ENTRY(entry, false);
 	}
 
-	for (i = 0; i < tu->tp.nr_args; i++) {
-		call_fetch(&tu->tp.args[i].fetch, regs,
-			   data + tu->tp.args[i].offset);
-	}
+	memcpy(data, ucb->buf, tu->tp.size + dsize);
 
 	if (!call_filter_check_discard(call, entry, buffer, event))
 		trace_buffer_unlock_commit(buffer, event, 0, 0);
+
+out:
+	uprobe_buffer_put(ucb);
 }
 
 /* uprobe handler */
@@ -752,6 +848,10 @@ probe_event_enable(struct trace_uprobe *tu, int flag, filter_func_t filter)
 	if (trace_probe_is_enabled(&tu->tp))
 		return -EINTR;
 
+	ret = uprobe_buffer_enable();
+	if (ret < 0)
+		return ret;
+
 	WARN_ON(!uprobe_filter_is_empty(&tu->filter));
 
 	tu->tp.flags |= flag;
@@ -772,6 +872,8 @@ static void probe_event_disable(struct trace_uprobe *tu, int flag)
 
 	uprobe_unregister(tu->inode, tu->offset, &tu->consumer);
 	tu->tp.flags &= ~flag;
+
+	uprobe_buffer_disable();
 }
 
 static int uprobe_event_define_fields(struct ftrace_event_call *event_call)
@@ -898,11 +1000,24 @@ static void uprobe_perf_print(struct trace_uprobe *tu,
 	struct ftrace_event_call *call = &tu->tp.call;
 	struct uprobe_trace_entry_head *entry;
 	struct hlist_head *head;
+	struct uprobe_cpu_buffer *ucb;
 	void *data;
-	int size, rctx, i;
+	int size, dsize, esize;
+	int rctx;
+
+	dsize = __get_data_size(&tu->tp, regs);
+	esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
 
-	size = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
-	size = ALIGN(size + tu->tp.size + sizeof(u32), sizeof(u64)) - sizeof(u32);
+	if (WARN_ON_ONCE(!uprobe_cpu_buffer))
+		return;
+
+	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;
+
+	ucb = uprobe_buffer_get();
+	store_trace_args(esize, &tu->tp, regs, ucb->buf, dsize);
 
 	preempt_disable();
 	head = this_cpu_ptr(call->perf_events);
@@ -922,15 +1037,18 @@ static void uprobe_perf_print(struct trace_uprobe *tu,
 		data = DATAOF_TRACE_ENTRY(entry, false);
 	}
 
-	for (i = 0; i < tu->tp.nr_args; i++) {
-		struct probe_arg *parg = &tu->tp.args[i];
+	memcpy(data, ucb->buf, tu->tp.size + dsize);
+
+	if (size - esize > tu->tp.size + dsize) {
+		int len = tu->tp.size + dsize;
 
-		call_fetch(&parg->fetch, regs, data + parg->offset);
+		memset(data + len, 0, size - esize - len);
 	}
 
 	perf_trace_buf_submit(entry, size, rctx, 0, 1, regs, head, NULL);
  out:
 	preempt_enable();
+	uprobe_buffer_put(ucb);
 }
 
 /* uprobe profile handler */
-- 
cgit v1.2.3-70-g09d2


From b7e0bf341f6cfa92ae0a0e3d0c3496729595e1e9 Mon Sep 17 00:00:00 2001
From: Namhyung Kim <namhyung.kim@lge.com>
Date: Mon, 25 Nov 2013 13:42:47 +0900
Subject: tracing/uprobes: Add @+file_offset fetch method

Enable to fetch data from a file offset.  Currently it only supports
fetching from same binary uprobe set.  It'll translate the file offset
to a proper virtual address in the process.

The syntax is "@+OFFSET" as it does similar to normal memory fetching
(@ADDR) which does no address translation.

Suggested-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 Documentation/trace/uprobetracer.txt |  1 +
 kernel/trace/trace_kprobe.c          |  8 ++++++++
 kernel/trace/trace_probe.c           | 13 +++++++++++-
 kernel/trace/trace_probe.h           |  2 ++
 kernel/trace/trace_uprobe.c          | 40 ++++++++++++++++++++++++++++++++++++
 5 files changed, 63 insertions(+), 1 deletion(-)

(limited to 'kernel/trace/trace_uprobe.c')

diff --git a/Documentation/trace/uprobetracer.txt b/Documentation/trace/uprobetracer.txt
index 6e5cff263e2..f1cf9a34ad9 100644
--- a/Documentation/trace/uprobetracer.txt
+++ b/Documentation/trace/uprobetracer.txt
@@ -32,6 +32,7 @@ Synopsis of uprobe_tracer
   FETCHARGS     : Arguments. Each probe can have up to 128 args.
    %REG         : Fetch register REG
    @ADDR	: Fetch memory at ADDR (ADDR should be in userspace)
+   @+OFFSET	: Fetch memory at OFFSET (OFFSET from same file as PATH)
    $stackN	: Fetch Nth entry of stack (N >= 0)
    $stack	: Fetch stack address.
    $retval	: Fetch return value.(*)
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index f94a56915e6..ce0ed8afb77 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -239,6 +239,14 @@ DEFINE_BASIC_FETCH_FUNCS(symbol)
 DEFINE_FETCH_symbol(string)
 DEFINE_FETCH_symbol(string_size)
 
+/* kprobes don't support file_offset fetch methods */
+#define fetch_file_offset_u8		NULL
+#define fetch_file_offset_u16		NULL
+#define fetch_file_offset_u32		NULL
+#define fetch_file_offset_u64		NULL
+#define fetch_file_offset_string	NULL
+#define fetch_file_offset_string_size	NULL
+
 /* Fetch type information table */
 const struct fetch_type kprobes_fetch_type_table[] = {
 	/* Special types */
diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index a130d612e70..8364a421b4d 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -374,7 +374,7 @@ static int parse_probe_arg(char *arg, const struct fetch_type *t,
 		}
 		break;
 
-	case '@':	/* memory or symbol */
+	case '@':	/* memory, file-offset or symbol */
 		if (isdigit(arg[1])) {
 			ret = kstrtoul(arg + 1, 0, &param);
 			if (ret)
@@ -382,6 +382,17 @@ static int parse_probe_arg(char *arg, const struct fetch_type *t,
 
 			f->fn = t->fetch[FETCH_MTD_memory];
 			f->data = (void *)param;
+		} else if (arg[1] == '+') {
+			/* kprobes don't support file offsets */
+			if (is_kprobe)
+				return -EINVAL;
+
+			ret = kstrtol(arg + 2, 0, &offset);
+			if (ret)
+				break;
+
+			f->fn = t->fetch[FETCH_MTD_file_offset];
+			f->data = (void *)offset;
 		} else {
 			/* uprobes don't support symbols */
 			if (!is_kprobe)
diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
index 2d5b8f5f531..e29d743fef5 100644
--- a/kernel/trace/trace_probe.h
+++ b/kernel/trace/trace_probe.h
@@ -106,6 +106,7 @@ enum {
 	FETCH_MTD_symbol,
 	FETCH_MTD_deref,
 	FETCH_MTD_bitfield,
+	FETCH_MTD_file_offset,
 	FETCH_MTD_END,
 };
 
@@ -217,6 +218,7 @@ ASSIGN_FETCH_FUNC(memory, ftype),			\
 ASSIGN_FETCH_FUNC(symbol, ftype),			\
 ASSIGN_FETCH_FUNC(deref, ftype),			\
 ASSIGN_FETCH_FUNC(bitfield, ftype),			\
+ASSIGN_FETCH_FUNC(file_offset, ftype),			\
 	  }						\
 	}
 
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 794e8bc171f..1fdea6d3f85 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -70,6 +70,11 @@ static int unregister_uprobe_event(struct trace_uprobe *tu);
 static DEFINE_MUTEX(uprobe_lock);
 static LIST_HEAD(uprobe_list);
 
+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);
@@ -175,6 +180,29 @@ static __kprobes void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs,
 #define fetch_symbol_string		NULL
 #define fetch_symbol_string_size	NULL
 
+static unsigned long translate_user_vaddr(void *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 + (unsigned long)file_offset;
+}
+
+#define DEFINE_FETCH_file_offset(type)					\
+static __kprobes void FETCH_FUNC_NAME(file_offset, type)(struct pt_regs *regs,\
+					void *offset, void *dest) 	\
+{									\
+	void *vaddr = (void *)translate_user_vaddr(offset);		\
+									\
+	FETCH_FUNC_NAME(memory, type)(regs, vaddr, dest);		\
+}
+DEFINE_BASIC_FETCH_FUNCS(file_offset)
+DEFINE_FETCH_file_offset(string)
+DEFINE_FETCH_file_offset(string_size)
+
 /* Fetch type information table */
 const struct fetch_type uprobes_fetch_type_table[] = {
 	/* Special types */
@@ -1106,11 +1134,17 @@ int trace_uprobe_register(struct ftrace_event_call *event, enum trace_reg type,
 static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *regs)
 {
 	struct trace_uprobe *tu;
+	struct uprobe_dispatch_data udd;
 	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 (tu->tp.flags & TP_FLAG_TRACE)
 		ret |= uprobe_trace_func(tu, regs);
 
@@ -1125,9 +1159,15 @@ static int uretprobe_dispatcher(struct uprobe_consumer *con,
 				unsigned long func, struct pt_regs *regs)
 {
 	struct trace_uprobe *tu;
+	struct uprobe_dispatch_data udd;
 
 	tu = container_of(con, struct trace_uprobe, consumer);
 
+	udd.tu = tu;
+	udd.bp_addr = func;
+
+	current->utask->vaddr = (unsigned long) &udd;
+
 	if (tu->tp.flags & TP_FLAG_TRACE)
 		uretprobe_trace_func(tu, func, regs);
 
-- 
cgit v1.2.3-70-g09d2


From e0d18fe063464cb3f1a6d1939e4fcf47d92d8386 Mon Sep 17 00:00:00 2001
From: Namhyung Kim <namhyung.kim@lge.com>
Date: Fri, 3 Jan 2014 14:12:46 +0900
Subject: tracing/probes: Fix build break on !CONFIG_KPROBE_EVENT

When kprobe-based dynamic event tracer is not enabled, it caused
following build error:

   kernel/built-in.o: In function `traceprobe_update_arg':
   (.text+0x10c8dd): undefined reference to `fetch_symbol_u8'
   kernel/built-in.o: In function `traceprobe_update_arg':
   (.text+0x10c8e9): undefined reference to `fetch_symbol_u16'
   kernel/built-in.o: In function `traceprobe_update_arg':
   (.text+0x10c8f5): undefined reference to `fetch_symbol_u32'
   kernel/built-in.o: In function `traceprobe_update_arg':
   (.text+0x10c901): undefined reference to `fetch_symbol_u64'
   kernel/built-in.o: In function `traceprobe_update_arg':
   (.text+0x10c909): undefined reference to `fetch_symbol_string'
   kernel/built-in.o: In function `traceprobe_update_arg':
   (.text+0x10c913): undefined reference to `fetch_symbol_string_size'
   ...

It was due to the fetch methods are referred from CHECK_FETCH_FUNCS
macro and since it was only defined in trace_kprobe.c.  Move NULL
definition of such fetch functions to the header file.

Note, it also requires CONFIG_BRANCH_PROFILING enabled to trigger
this failure as well. This is because the "fetch_symbol_*" variables
are referenced in a "else if" statement that will only call
update_symbol_cache(), which is a static inline stub function
when CONFIG_KPROBE_EVENT is not enabled. gcc is smart enough
to optimize this "else if" out and that also removes the code that
references the undefined variables.

But when BRANCH_PROFILING is enabled, it fools gcc into keeping
the if statement around and thus references the undefined symbols
and fails to build.

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 kernel/trace/trace_probe.h  | 8 ++++++++
 kernel/trace/trace_uprobe.c | 8 --------
 2 files changed, 8 insertions(+), 8 deletions(-)

(limited to 'kernel/trace/trace_uprobe.c')

diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
index e29d743fef5..b73574a5f42 100644
--- a/kernel/trace/trace_probe.h
+++ b/kernel/trace/trace_probe.h
@@ -243,6 +243,14 @@ unsigned long update_symbol_cache(struct symbol_cache *sc);
 void free_symbol_cache(struct symbol_cache *sc);
 struct symbol_cache *alloc_symbol_cache(const char *sym, long offset);
 #else
+/* uprobes do not support symbol fetch methods */
+#define fetch_symbol_u8			NULL
+#define fetch_symbol_u16		NULL
+#define fetch_symbol_u32		NULL
+#define fetch_symbol_u64		NULL
+#define fetch_symbol_string		NULL
+#define fetch_symbol_string_size	NULL
+
 struct symbol_cache {
 };
 static inline unsigned long __used update_symbol_cache(struct symbol_cache *sc)
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 1fdea6d3f85..79e52d93860 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -172,14 +172,6 @@ static __kprobes void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs,
 		*(u32 *)dest = len;
 }
 
-/* uprobes do not support symbol fetch methods */
-#define fetch_symbol_u8			NULL
-#define fetch_symbol_u16		NULL
-#define fetch_symbol_u32		NULL
-#define fetch_symbol_u64		NULL
-#define fetch_symbol_string		NULL
-#define fetch_symbol_string_size	NULL
-
 static unsigned long translate_user_vaddr(void *file_offset)
 {
 	unsigned long base_addr;
-- 
cgit v1.2.3-70-g09d2