// 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"

/* Stub function for events with triggers */
static int ftrace_event_register(struct trace_event_call *call,
                                 enum trace_reg type, void *data)
{
        return 0;
}

#undef TRACE_SYSTEM
#define TRACE_SYSTEM    ftrace

/*
 * The FTRACE_ENTRY_REG macro allows ftrace entry to define register
 * function and thus become accessible via perf.
 */
#undef FTRACE_ENTRY_REG
#define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, regfn) \
        FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print))

/* not needed for this file */
#undef __field_struct
#define __field_struct(type, item)

#undef __field
#define __field(type, item)                             type item;

#undef __field_fn
#define __field_fn(type, item)                          type item;

#undef __field_packed
#define __field_packed(type, item)                      type item;

#undef __field_desc
#define __field_desc(type, container, item)             type item;

#undef __field_desc_packed
#define __field_desc_packed(type, container, item)      type item;

#undef __array
#define __array(type, item, size)                       type item[size];

#undef __stack_array
#define __stack_array(type, item, size, field)          __array(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)             \
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)         \
        FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print))

#include "trace_entries.h"

#undef __field_ext
#define __field_ext(_type, _item, _filter_type) {                       \
        .type = #_type, .name = #_item,                                 \
        .size = sizeof(_type), .align = __alignof__(_type),             \
        is_signed_type(_type), .filter_type = _filter_type },


#undef __field_ext_packed
#define __field_ext_packed(_type, _item, _filter_type) {        \
        .type = #_type, .name = #_item,                         \
        .size = sizeof(_type), .align = 1,                      \
        is_signed_type(_type), .filter_type = _filter_type },

#undef __field
#define __field(_type, _item) __field_ext(_type, _item, FILTER_OTHER)

#undef __field_fn
#define __field_fn(_type, _item) __field_ext(_type, _item, FILTER_TRACE_FN)

#undef __field_packed
#define __field_packed(_type, _item) __field_ext_packed(_type, _item, FILTER_OTHER)

#undef __field_desc
#define __field_desc(_type, _container, _item) __field_ext(_type, _item, FILTER_OTHER)

#undef __field_desc_packed
#define __field_desc_packed(_type, _container, _item) __field_ext_packed(_type, _item, FILTER_OTHER)

#undef __array
#define __array(_type, _item, _len) {                                   \
        .type = #_type"["__stringify(_len)"]", .name = #_item,          \
        .size = sizeof(_type[_len]), .align = __alignof__(_type),       \
        is_signed_type(_type), .filter_type = FILTER_OTHER,                     \
        .len = _len },

#undef __stack_array
#define __stack_array(_type, _item, _len, _field) __array(_type, _item, _len)

#undef __array_desc
#define __array_desc(_type, _container, _item, _len) __array(_type, _item, _len)

#undef __dynamic_array
#define __dynamic_array(_type, _item) {                                 \
        .type = #_type "[]", .name = #_item,                            \
        .size = 0, .align = __alignof__(_type),                         \
        is_signed_type(_type), .filter_type = FILTER_OTHER },

#undef FTRACE_ENTRY
#define FTRACE_ENTRY(name, struct_name, id, tstruct, print)             \
static struct trace_event_fields ftrace_event_fields_##name[] = {       \
        tstruct                                                         \
        {} };

#include "trace_entries.h"

#undef __entry
#define __entry REC

#undef __field
#define __field(type, item)

#undef __field_fn
#define __field_fn(type, item)

#undef __field_packed
#define __field_packed(type, item)

#undef __field_desc
#define __field_desc(type, container, item)

#undef __field_desc_packed
#define __field_desc_packed(type, container, item)

#undef __array
#define __array(type, item, len)

#undef __stack_array
#define __stack_array(type, item, len, field)

#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, regfn) \
static struct trace_event_class __refdata event_class_ftrace_##call = { \
        .system                 = __stringify(TRACE_SYSTEM),            \
        .fields_array           = ftrace_event_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,         \
};                                                                      \
static struct trace_event_call __used                                           \
__section("_ftrace_events") *__event_##call = &event_##call;

#undef FTRACE_ENTRY
#define FTRACE_ENTRY(call, struct_name, etype, tstruct, print)          \
        FTRACE_ENTRY_REG(call, struct_name, etype,                      \
                         PARAMS(tstruct), PARAMS(print), NULL)

bool ftrace_event_is_function(struct trace_event_call *call)
{
        return call == &event_function;
}

#include "trace_entries.h"