| 1 | /* |
| 2 | * trace_export.c - export basic ftrace utilities to user space |
| 3 | * |
| 4 | * Copyright (C) 2009 Steven Rostedt <srostedt@redhat.com> |
| 5 | */ |
| 6 | #include <linux/stringify.h> |
| 7 | #include <linux/kallsyms.h> |
| 8 | #include <linux/seq_file.h> |
| 9 | #include <linux/uaccess.h> |
| 10 | #include <linux/ftrace.h> |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/init.h> |
| 13 | |
| 14 | #include "trace_output.h" |
| 15 | |
| 16 | #undef TRACE_SYSTEM |
| 17 | #define TRACE_SYSTEM ftrace |
| 18 | |
| 19 | /* |
| 20 | * The FTRACE_ENTRY_REG macro allows ftrace entry to define register |
| 21 | * function and thus become accesible via perf. |
| 22 | */ |
| 23 | #undef FTRACE_ENTRY_REG |
| 24 | #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \ |
| 25 | filter, regfn) \ |
| 26 | FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \ |
| 27 | filter) |
| 28 | |
| 29 | /* not needed for this file */ |
| 30 | #undef __field_struct |
| 31 | #define __field_struct(type, item) |
| 32 | |
| 33 | #undef __field |
| 34 | #define __field(type, item) type item; |
| 35 | |
| 36 | #undef __field_desc |
| 37 | #define __field_desc(type, container, item) type item; |
| 38 | |
| 39 | #undef __array |
| 40 | #define __array(type, item, size) type item[size]; |
| 41 | |
| 42 | #undef __array_desc |
| 43 | #define __array_desc(type, container, item, size) type item[size]; |
| 44 | |
| 45 | #undef __dynamic_array |
| 46 | #define __dynamic_array(type, item) type item[]; |
| 47 | |
| 48 | #undef F_STRUCT |
| 49 | #define F_STRUCT(args...) args |
| 50 | |
| 51 | #undef F_printk |
| 52 | #define F_printk(fmt, args...) fmt, args |
| 53 | |
| 54 | #undef FTRACE_ENTRY |
| 55 | #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \ |
| 56 | struct ____ftrace_##name { \ |
| 57 | tstruct \ |
| 58 | }; \ |
| 59 | static void __always_unused ____ftrace_check_##name(void) \ |
| 60 | { \ |
| 61 | struct ____ftrace_##name *__entry = NULL; \ |
| 62 | \ |
| 63 | /* force compile-time check on F_printk() */ \ |
| 64 | printk(print); \ |
| 65 | } |
| 66 | |
| 67 | #undef FTRACE_ENTRY_DUP |
| 68 | #define FTRACE_ENTRY_DUP(name, struct_name, id, tstruct, print, filter) \ |
| 69 | FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \ |
| 70 | filter) |
| 71 | |
| 72 | #include "trace_entries.h" |
| 73 | |
| 74 | #undef __field |
| 75 | #define __field(type, item) \ |
| 76 | ret = trace_define_field(event_call, #type, #item, \ |
| 77 | offsetof(typeof(field), item), \ |
| 78 | sizeof(field.item), \ |
| 79 | is_signed_type(type), filter_type); \ |
| 80 | if (ret) \ |
| 81 | return ret; |
| 82 | |
| 83 | #undef __field_desc |
| 84 | #define __field_desc(type, container, item) \ |
| 85 | ret = trace_define_field(event_call, #type, #item, \ |
| 86 | offsetof(typeof(field), \ |
| 87 | container.item), \ |
| 88 | sizeof(field.container.item), \ |
| 89 | is_signed_type(type), filter_type); \ |
| 90 | if (ret) \ |
| 91 | return ret; |
| 92 | |
| 93 | #undef __array |
| 94 | #define __array(type, item, len) \ |
| 95 | do { \ |
| 96 | char *type_str = #type"["__stringify(len)"]"; \ |
| 97 | BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \ |
| 98 | ret = trace_define_field(event_call, type_str, #item, \ |
| 99 | offsetof(typeof(field), item), \ |
| 100 | sizeof(field.item), \ |
| 101 | is_signed_type(type), filter_type); \ |
| 102 | if (ret) \ |
| 103 | return ret; \ |
| 104 | } while (0); |
| 105 | |
| 106 | #undef __array_desc |
| 107 | #define __array_desc(type, container, item, len) \ |
| 108 | BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \ |
| 109 | ret = trace_define_field(event_call, #type "[" #len "]", #item, \ |
| 110 | offsetof(typeof(field), \ |
| 111 | container.item), \ |
| 112 | sizeof(field.container.item), \ |
| 113 | is_signed_type(type), filter_type); \ |
| 114 | if (ret) \ |
| 115 | return ret; |
| 116 | |
| 117 | #undef __dynamic_array |
| 118 | #define __dynamic_array(type, item) \ |
| 119 | ret = trace_define_field(event_call, #type, #item, \ |
| 120 | offsetof(typeof(field), item), \ |
| 121 | 0, is_signed_type(type), filter_type);\ |
| 122 | if (ret) \ |
| 123 | return ret; |
| 124 | |
| 125 | #undef FTRACE_ENTRY |
| 126 | #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \ |
| 127 | static int __init \ |
| 128 | ftrace_define_fields_##name(struct trace_event_call *event_call) \ |
| 129 | { \ |
| 130 | struct struct_name field; \ |
| 131 | int ret; \ |
| 132 | int filter_type = filter; \ |
| 133 | \ |
| 134 | tstruct; \ |
| 135 | \ |
| 136 | return ret; \ |
| 137 | } |
| 138 | |
| 139 | #include "trace_entries.h" |
| 140 | |
| 141 | #undef __entry |
| 142 | #define __entry REC |
| 143 | |
| 144 | #undef __field |
| 145 | #define __field(type, item) |
| 146 | |
| 147 | #undef __field_desc |
| 148 | #define __field_desc(type, container, item) |
| 149 | |
| 150 | #undef __array |
| 151 | #define __array(type, item, len) |
| 152 | |
| 153 | #undef __array_desc |
| 154 | #define __array_desc(type, container, item, len) |
| 155 | |
| 156 | #undef __dynamic_array |
| 157 | #define __dynamic_array(type, item) |
| 158 | |
| 159 | #undef F_printk |
| 160 | #define F_printk(fmt, args...) __stringify(fmt) ", " __stringify(args) |
| 161 | |
| 162 | #undef FTRACE_ENTRY_REG |
| 163 | #define FTRACE_ENTRY_REG(call, struct_name, etype, tstruct, print, filter,\ |
| 164 | regfn) \ |
| 165 | \ |
| 166 | struct trace_event_class __refdata event_class_ftrace_##call = { \ |
| 167 | .system = __stringify(TRACE_SYSTEM), \ |
| 168 | .define_fields = ftrace_define_fields_##call, \ |
| 169 | .fields = LIST_HEAD_INIT(event_class_ftrace_##call.fields),\ |
| 170 | .reg = regfn, \ |
| 171 | }; \ |
| 172 | \ |
| 173 | struct trace_event_call __used event_##call = { \ |
| 174 | .class = &event_class_ftrace_##call, \ |
| 175 | { \ |
| 176 | .name = #call, \ |
| 177 | }, \ |
| 178 | .event.type = etype, \ |
| 179 | .print_fmt = print, \ |
| 180 | .flags = TRACE_EVENT_FL_IGNORE_ENABLE, \ |
| 181 | }; \ |
| 182 | struct trace_event_call __used \ |
| 183 | __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call; |
| 184 | |
| 185 | #undef FTRACE_ENTRY |
| 186 | #define FTRACE_ENTRY(call, struct_name, etype, tstruct, print, filter) \ |
| 187 | FTRACE_ENTRY_REG(call, struct_name, etype, \ |
| 188 | PARAMS(tstruct), PARAMS(print), filter, NULL) |
| 189 | |
| 190 | bool ftrace_event_is_function(struct trace_event_call *call) |
| 191 | { |
| 192 | return call == &event_function; |
| 193 | } |
| 194 | |
| 195 | #include "trace_entries.h" |