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191 lines
5.2 KiB
191 lines
5.2 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* trace_export.c - export basic ftrace utilities to user space |
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* |
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* Copyright (C) 2009 Steven Rostedt <[email protected]> |
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*/ |
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#include <linux/stringify.h> |
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#include <linux/kallsyms.h> |
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#include <linux/seq_file.h> |
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#include <linux/uaccess.h> |
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#include <linux/ftrace.h> |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include "trace_output.h" |
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/* Stub function for events with triggers */ |
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static int ftrace_event_register(struct trace_event_call *call, |
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enum trace_reg type, void *data) |
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{ |
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return 0; |
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} |
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#undef TRACE_SYSTEM |
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#define TRACE_SYSTEM ftrace |
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/* |
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* The FTRACE_ENTRY_REG macro allows ftrace entry to define register |
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* function and thus become accessible via perf. |
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*/ |
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#undef FTRACE_ENTRY_REG |
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#define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, regfn) \ |
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FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) |
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/* not needed for this file */ |
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#undef __field_struct |
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#define __field_struct(type, item) |
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#undef __field |
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#define __field(type, item) type item; |
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#undef __field_fn |
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#define __field_fn(type, item) type item; |
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#undef __field_desc |
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#define __field_desc(type, container, item) type item; |
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#undef __field_packed |
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#define __field_packed(type, container, item) type item; |
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#undef __array |
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#define __array(type, item, size) type item[size]; |
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#undef __array_desc |
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#define __array_desc(type, container, item, size) type item[size]; |
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#undef __dynamic_array |
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#define __dynamic_array(type, item) type item[]; |
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#undef F_STRUCT |
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#define F_STRUCT(args...) args |
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#undef F_printk |
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#define F_printk(fmt, args...) fmt, args |
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#undef FTRACE_ENTRY |
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#define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ |
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struct ____ftrace_##name { \ |
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tstruct \ |
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}; \ |
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static void __always_unused ____ftrace_check_##name(void) \ |
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{ \ |
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struct ____ftrace_##name *__entry = NULL; \ |
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\ |
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/* force compile-time check on F_printk() */ \ |
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printk(print); \ |
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} |
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#undef FTRACE_ENTRY_DUP |
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#define FTRACE_ENTRY_DUP(name, struct_name, id, tstruct, print) \ |
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FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) |
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#include "trace_entries.h" |
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#undef __field_ext |
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#define __field_ext(_type, _item, _filter_type) { \ |
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.type = #_type, .name = #_item, \ |
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.size = sizeof(_type), .align = __alignof__(_type), \ |
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is_signed_type(_type), .filter_type = _filter_type }, |
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#undef __field_ext_packed |
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#define __field_ext_packed(_type, _item, _filter_type) { \ |
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.type = #_type, .name = #_item, \ |
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.size = sizeof(_type), .align = 1, \ |
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is_signed_type(_type), .filter_type = _filter_type }, |
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#undef __field |
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#define __field(_type, _item) __field_ext(_type, _item, FILTER_OTHER) |
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#undef __field_fn |
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#define __field_fn(_type, _item) __field_ext(_type, _item, FILTER_TRACE_FN) |
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#undef __field_desc |
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#define __field_desc(_type, _container, _item) __field_ext(_type, _item, FILTER_OTHER) |
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#undef __field_packed |
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#define __field_packed(_type, _container, _item) __field_ext_packed(_type, _item, FILTER_OTHER) |
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#undef __array |
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#define __array(_type, _item, _len) { \ |
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.type = #_type"["__stringify(_len)"]", .name = #_item, \ |
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.size = sizeof(_type[_len]), .align = __alignof__(_type), \ |
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is_signed_type(_type), .filter_type = FILTER_OTHER }, |
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#undef __array_desc |
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#define __array_desc(_type, _container, _item, _len) __array(_type, _item, _len) |
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#undef __dynamic_array |
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#define __dynamic_array(_type, _item) { \ |
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.type = #_type "[]", .name = #_item, \ |
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.size = 0, .align = __alignof__(_type), \ |
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is_signed_type(_type), .filter_type = FILTER_OTHER }, |
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#undef FTRACE_ENTRY |
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#define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ |
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static struct trace_event_fields ftrace_event_fields_##name[] = { \ |
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tstruct \ |
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{} }; |
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#include "trace_entries.h" |
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#undef __entry |
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#define __entry REC |
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#undef __field |
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#define __field(type, item) |
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#undef __field_fn |
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#define __field_fn(type, item) |
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#undef __field_desc |
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#define __field_desc(type, container, item) |
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#undef __field_packed |
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#define __field_packed(type, container, item) |
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#undef __array |
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#define __array(type, item, len) |
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#undef __array_desc |
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#define __array_desc(type, container, item, len) |
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#undef __dynamic_array |
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#define __dynamic_array(type, item) |
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#undef F_printk |
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#define F_printk(fmt, args...) __stringify(fmt) ", " __stringify(args) |
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#undef FTRACE_ENTRY_REG |
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#define FTRACE_ENTRY_REG(call, struct_name, etype, tstruct, print, regfn) \ |
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static struct trace_event_class __refdata event_class_ftrace_##call = { \ |
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.system = __stringify(TRACE_SYSTEM), \ |
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.fields_array = ftrace_event_fields_##call, \ |
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.fields = LIST_HEAD_INIT(event_class_ftrace_##call.fields),\ |
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.reg = regfn, \ |
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}; \ |
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\ |
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struct trace_event_call __used event_##call = { \ |
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.class = &event_class_ftrace_##call, \ |
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{ \ |
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.name = #call, \ |
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}, \ |
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.event.type = etype, \ |
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.print_fmt = print, \ |
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.flags = TRACE_EVENT_FL_IGNORE_ENABLE, \ |
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}; \ |
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static struct trace_event_call __used \ |
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__section("_ftrace_events") *__event_##call = &event_##call; |
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#undef FTRACE_ENTRY |
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#define FTRACE_ENTRY(call, struct_name, etype, tstruct, print) \ |
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FTRACE_ENTRY_REG(call, struct_name, etype, \ |
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PARAMS(tstruct), PARAMS(print), NULL) |
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bool ftrace_event_is_function(struct trace_event_call *call) |
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{ |
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return call == &event_function; |
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} |
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#include "trace_entries.h"
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