// SPDX-License-Identifier: GPL-2.0/* * trace_export.c - export basic ftrace utilities to user space * * Copyright (C) 2009 Steven Rostedt <srostedt@redhat.com> */#include <linux/stringify.h>#include <linux/kallsyms.h>#include <linux/seq_file.h>#include <linux/uaccess.h>#include <linux/ftrace.h>#include <linux/module.h>#include <linux/init.h> #include "trace_output.h" #undef TRACE_SYSTEM#define TRACE_SYSTEM	ftrace /* * The FTRACE_ENTRY_REG macro allows ftrace entry to define register * function and thus become accesible via perf. */#undef FTRACE_ENTRY_REG#define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \			 filter, regfn) \	FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \		     filter) /* not needed for this file */#undef __field_struct#define __field_struct(type, item) #undef __field#define __field(type, item)				type item; #undef __field_desc#define __field_desc(type, container, item)		type item; #undef __array#define __array(type, item, size)			type item[size]; #undef __array_desc#define __array_desc(type, container, item, size)	type item[size]; #undef __dynamic_array#define __dynamic_array(type, item)			type item[]; #undef F_STRUCT#define F_STRUCT(args...)				args #undef F_printk#define F_printk(fmt, args...) fmt, args #undef FTRACE_ENTRY#define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter)	\struct ____ftrace_##name {						\	tstruct								\};									\static void __always_unused ____ftrace_check_##name(void)		\{									\	struct ____ftrace_##name *__entry = NULL;			\									\	/* force compile-time check on F_printk() */			\	printk(print);							\} #undef FTRACE_ENTRY_DUP#define FTRACE_ENTRY_DUP(name, struct_name, id, tstruct, print, filter)	\	FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \		     filter) #include "trace_entries.h" #undef __field#define __field(type, item)						\	ret = trace_define_field(event_call, #type, #item,		\				 offsetof(typeof(field), item),		\				 sizeof(field.item),			\				 is_signed_type(type), filter_type);	\	if (ret)							\		return ret; #undef __field_desc#define __field_desc(type, container, item)	\	ret = trace_define_field(event_call, #type, #item,		\				 offsetof(typeof(field),		\					  container.item),		\				 sizeof(field.container.item),		\				 is_signed_type(type), filter_type);	\	if (ret)							\		return ret; #undef __array#define __array(type, item, len)					\	do {								\		char *type_str = #type"["__stringify(len)"]";		\		BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);			\		ret = trace_define_field(event_call, type_str, #item,	\				 offsetof(typeof(field), item),		\				 sizeof(field.item),			\				 is_signed_type(type), filter_type);	\		if (ret)						\			return ret;					\	} while (0); #undef __array_desc#define __array_desc(type, container, item, len)			\	BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);				\	ret = trace_define_field(event_call, #type "[" #len "]", #item,	\				 offsetof(typeof(field),		\					  container.item),		\				 sizeof(field.container.item),		\				 is_signed_type(type), filter_type);	\	if (ret)							\		return ret; #undef __dynamic_array#define __dynamic_array(type, item)					\	ret = trace_define_field(event_call, #type, #item,		\				 offsetof(typeof(field), item),		\				 0, is_signed_type(type), filter_type);\	if (ret)							\		return ret; #undef FTRACE_ENTRY#define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter)	\static int __init							\ftrace_define_fields_##name(struct trace_event_call *event_call)	\{									\	struct struct_name field;					\	int ret;							\	int filter_type = filter;					\									\	tstruct;							\									\	return ret;							\} #include "trace_entries.h" #undef __entry#define __entry REC #undef __field#define __field(type, item) #undef __field_desc#define __field_desc(type, container, item) #undef __array#define __array(type, item, len) #undef __array_desc#define __array_desc(type, container, item, len) #undef __dynamic_array#define __dynamic_array(type, item) #undef F_printk#define F_printk(fmt, args...) __stringify(fmt) ", "  __stringify(args) #undef FTRACE_ENTRY_REG#define FTRACE_ENTRY_REG(call, struct_name, etype, tstruct, print, filter,\			 regfn)						\									\struct trace_event_class __refdata event_class_ftrace_##call = {	\	.system			= __stringify(TRACE_SYSTEM),		\	.define_fields		= ftrace_define_fields_##call,		\	.fields			= LIST_HEAD_INIT(event_class_ftrace_##call.fields),\	.reg			= regfn,				\};									\									\struct trace_event_call __used event_##call = {				\	.class			= &event_class_ftrace_##call,		\	{								\		.name			= #call,			\	},								\	.event.type		= etype,				\	.print_fmt		= print,				\	.flags			= TRACE_EVENT_FL_IGNORE_ENABLE,		\};									\struct trace_event_call __used						\__attribute__((section("_ftrace_events"))) *__event_##call = &event_##call; #undef FTRACE_ENTRY#define FTRACE_ENTRY(call, struct_name, etype, tstruct, print, filter)	\	FTRACE_ENTRY_REG(call, struct_name, etype,			\			 PARAMS(tstruct), PARAMS(print), filter, NULL) bool ftrace_event_is_function(struct trace_event_call *call){	return call == &event_function;} #include "trace_entries.h"