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 static int ftrace_event_register(struct trace_event_call *call, 19 enum trace_reg type, void *data) 20 { 21 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 accesible 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 __attribute__((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 bool ftrace_event_is_function(struct trace_event_call *call) 187 { 188 return call == &event_function; 189 } 190 191 #include "trace_entries.h" 192