LCOV - code coverage report
Current view: top level - kernel/trace - trace_export.c (source / functions) Hit Total Coverage
Test: landlock.info Lines: 0 4 0.0 %
Date: 2021-04-22 12:43:58 Functions: 0 2 0.0 %

          Line data    Source code
       1             : // SPDX-License-Identifier: GPL-2.0
       2             : /*
       3             :  * trace_export.c - export basic ftrace utilities to user space
       4             :  *
       5             :  * Copyright (C) 2009 Steven Rostedt <srostedt@redhat.com>
       6             :  */
       7             : #include <linux/stringify.h>
       8             : #include <linux/kallsyms.h>
       9             : #include <linux/seq_file.h>
      10             : #include <linux/uaccess.h>
      11             : #include <linux/ftrace.h>
      12             : #include <linux/module.h>
      13             : #include <linux/init.h>
      14             : 
      15             : #include "trace_output.h"
      16             : 
      17             : /* Stub function for events with triggers */
      18           0 : static int ftrace_event_register(struct trace_event_call *call,
      19             :                                  enum trace_reg type, void *data)
      20             : {
      21           0 :         return 0;
      22             : }
      23             : 
      24             : #undef TRACE_SYSTEM
      25             : #define TRACE_SYSTEM    ftrace
      26             : 
      27             : /*
      28             :  * The FTRACE_ENTRY_REG macro allows ftrace entry to define register
      29             :  * function and thus become accessible via perf.
      30             :  */
      31             : #undef FTRACE_ENTRY_REG
      32             : #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, regfn) \
      33             :         FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print))
      34             : 
      35             : /* not needed for this file */
      36             : #undef __field_struct
      37             : #define __field_struct(type, item)
      38             : 
      39             : #undef __field
      40             : #define __field(type, item)                             type item;
      41             : 
      42             : #undef __field_fn
      43             : #define __field_fn(type, item)                          type item;
      44             : 
      45             : #undef __field_desc
      46             : #define __field_desc(type, container, item)             type item;
      47             : 
      48             : #undef __field_packed
      49             : #define __field_packed(type, container, item)           type item;
      50             : 
      51             : #undef __array
      52             : #define __array(type, item, size)                       type item[size];
      53             : 
      54             : #undef __array_desc
      55             : #define __array_desc(type, container, item, size)       type item[size];
      56             : 
      57             : #undef __dynamic_array
      58             : #define __dynamic_array(type, item)                     type item[];
      59             : 
      60             : #undef F_STRUCT
      61             : #define F_STRUCT(args...)                               args
      62             : 
      63             : #undef F_printk
      64             : #define F_printk(fmt, args...) fmt, args
      65             : 
      66             : #undef FTRACE_ENTRY
      67             : #define FTRACE_ENTRY(name, struct_name, id, tstruct, print)             \
      68             : struct ____ftrace_##name {                                              \
      69             :         tstruct                                                         \
      70             : };                                                                      \
      71             : static void __always_unused ____ftrace_check_##name(void)               \
      72             : {                                                                       \
      73             :         struct ____ftrace_##name *__entry = NULL;                       \
      74             :                                                                         \
      75             :         /* force compile-time check on F_printk() */                    \
      76             :         printk(print);                                                  \
      77             : }
      78             : 
      79             : #undef FTRACE_ENTRY_DUP
      80             : #define FTRACE_ENTRY_DUP(name, struct_name, id, tstruct, print)         \
      81             :         FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print))
      82             : 
      83             : #include "trace_entries.h"
      84             : 
      85             : #undef __field_ext
      86             : #define __field_ext(_type, _item, _filter_type) {                       \
      87             :         .type = #_type, .name = #_item,                                 \
      88             :         .size = sizeof(_type), .align = __alignof__(_type),             \
      89             :         is_signed_type(_type), .filter_type = _filter_type },
      90             : 
      91             : 
      92             : #undef __field_ext_packed
      93             : #define __field_ext_packed(_type, _item, _filter_type) {        \
      94             :         .type = #_type, .name = #_item,                         \
      95             :         .size = sizeof(_type), .align = 1,                      \
      96             :         is_signed_type(_type), .filter_type = _filter_type },
      97             : 
      98             : #undef __field
      99             : #define __field(_type, _item) __field_ext(_type, _item, FILTER_OTHER)
     100             : 
     101             : #undef __field_fn
     102             : #define __field_fn(_type, _item) __field_ext(_type, _item, FILTER_TRACE_FN)
     103             : 
     104             : #undef __field_desc
     105             : #define __field_desc(_type, _container, _item) __field_ext(_type, _item, FILTER_OTHER)
     106             : 
     107             : #undef __field_packed
     108             : #define __field_packed(_type, _container, _item) __field_ext_packed(_type, _item, FILTER_OTHER)
     109             : 
     110             : #undef __array
     111             : #define __array(_type, _item, _len) {                                   \
     112             :         .type = #_type"["__stringify(_len)"]", .name = #_item,              \
     113             :         .size = sizeof(_type[_len]), .align = __alignof__(_type),       \
     114             :         is_signed_type(_type), .filter_type = FILTER_OTHER },
     115             : 
     116             : #undef __array_desc
     117             : #define __array_desc(_type, _container, _item, _len) __array(_type, _item, _len)
     118             : 
     119             : #undef __dynamic_array
     120             : #define __dynamic_array(_type, _item) {                                 \
     121             :         .type = #_type "[]", .name = #_item,                          \
     122             :         .size = 0, .align = __alignof__(_type),                         \
     123             :         is_signed_type(_type), .filter_type = FILTER_OTHER },
     124             : 
     125             : #undef FTRACE_ENTRY
     126             : #define FTRACE_ENTRY(name, struct_name, id, tstruct, print)             \
     127             : static struct trace_event_fields ftrace_event_fields_##name[] = {       \
     128             :         tstruct                                                         \
     129             :         {} };
     130             : 
     131             : #include "trace_entries.h"
     132             : 
     133             : #undef __entry
     134             : #define __entry REC
     135             : 
     136             : #undef __field
     137             : #define __field(type, item)
     138             : 
     139             : #undef __field_fn
     140             : #define __field_fn(type, item)
     141             : 
     142             : #undef __field_desc
     143             : #define __field_desc(type, container, item)
     144             : 
     145             : #undef __field_packed
     146             : #define __field_packed(type, container, item)
     147             : 
     148             : #undef __array
     149             : #define __array(type, item, len)
     150             : 
     151             : #undef __array_desc
     152             : #define __array_desc(type, container, item, len)
     153             : 
     154             : #undef __dynamic_array
     155             : #define __dynamic_array(type, item)
     156             : 
     157             : #undef F_printk
     158             : #define F_printk(fmt, args...) __stringify(fmt) ", "  __stringify(args)
     159             : 
     160             : #undef FTRACE_ENTRY_REG
     161             : #define FTRACE_ENTRY_REG(call, struct_name, etype, tstruct, print, regfn) \
     162             : static struct trace_event_class __refdata event_class_ftrace_##call = { \
     163             :         .system                 = __stringify(TRACE_SYSTEM),            \
     164             :         .fields_array           = ftrace_event_fields_##call,           \
     165             :         .fields                 = LIST_HEAD_INIT(event_class_ftrace_##call.fields),\
     166             :         .reg                    = regfn,                                \
     167             : };                                                                      \
     168             :                                                                         \
     169             : struct trace_event_call __used event_##call = {                         \
     170             :         .class                  = &event_class_ftrace_##call,               \
     171             :         {                                                               \
     172             :                 .name                   = #call,                        \
     173             :         },                                                              \
     174             :         .event.type             = etype,                                \
     175             :         .print_fmt              = print,                                \
     176             :         .flags                  = TRACE_EVENT_FL_IGNORE_ENABLE,         \
     177             : };                                                                      \
     178             : static struct trace_event_call __used                                           \
     179             : __section("_ftrace_events") *__event_##call = &event_##call;
     180             : 
     181             : #undef FTRACE_ENTRY
     182             : #define FTRACE_ENTRY(call, struct_name, etype, tstruct, print)          \
     183             :         FTRACE_ENTRY_REG(call, struct_name, etype,                      \
     184             :                          PARAMS(tstruct), PARAMS(print), NULL)
     185             : 
     186           0 : bool ftrace_event_is_function(struct trace_event_call *call)
     187             : {
     188           0 :         return call == &event_function;
     189             : }
     190             : 
     191             : #include "trace_entries.h"

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