75db37d2f4
The events exported by TRACE_EVENT are automated and are guaranteed to be correct when used. The internal ftrace structures on the other hand are more manually exported. These require the ftrace maintainer to make sure they are up to date. This patch adds a size check to help flag when a type changes in an internal ftrace data structure, and the update needs to be reflected in the export. If a export is incorrect, then the only harm is that the user space tools will not know how to correctly read the internal structures of ftrace. [ Impact: help prevent inconsistent ftrace format print outs ] Signed-off-by: Steven Rostedt <srostedt@redhat.com>
192 lines
5 KiB
C
192 lines
5 KiB
C
/*
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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 <srostedt@redhat.com>
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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/debugfs.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 <linux/fs.h>
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#include "trace_output.h"
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#undef TRACE_STRUCT
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#define TRACE_STRUCT(args...) args
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extern void __bad_type_size(void);
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#undef TRACE_FIELD
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#define TRACE_FIELD(type, item, assign) \
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if (sizeof(type) != sizeof(field.item)) \
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__bad_type_size(); \
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ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t" \
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"offset:%u;\tsize:%u;\n", \
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(unsigned int)offsetof(typeof(field), item), \
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(unsigned int)sizeof(field.item)); \
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if (!ret) \
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return 0;
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#undef TRACE_FIELD_SPECIAL
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#define TRACE_FIELD_SPECIAL(type_item, item, len, cmd) \
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ret = trace_seq_printf(s, "\tfield special:" #type_item ";\t" \
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"offset:%u;\tsize:%u;\n", \
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(unsigned int)offsetof(typeof(field), item), \
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(unsigned int)sizeof(field.item)); \
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if (!ret) \
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return 0;
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#undef TRACE_FIELD_ZERO_CHAR
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#define TRACE_FIELD_ZERO_CHAR(item) \
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ret = trace_seq_printf(s, "\tfield:char " #item ";\t" \
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"offset:%u;\tsize:0;\n", \
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(unsigned int)offsetof(typeof(field), item)); \
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if (!ret) \
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return 0;
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#undef TP_RAW_FMT
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#define TP_RAW_FMT(args...) args
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#undef TRACE_EVENT_FORMAT
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#define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt) \
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static int \
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ftrace_format_##call(struct trace_seq *s) \
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{ \
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struct args field; \
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int ret; \
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\
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tstruct; \
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\
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trace_seq_printf(s, "\nprint fmt: \"%s\"\n", tpfmt); \
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\
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return ret; \
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}
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#undef TRACE_EVENT_FORMAT_NOFILTER
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#define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct, \
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tpfmt) \
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static int \
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ftrace_format_##call(struct trace_seq *s) \
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{ \
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struct args field; \
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int ret; \
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\
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tstruct; \
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\
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trace_seq_printf(s, "\nprint fmt: \"%s\"\n", tpfmt); \
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\
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return ret; \
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}
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#include "trace_event_types.h"
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#undef TRACE_ZERO_CHAR
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#define TRACE_ZERO_CHAR(arg)
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#undef TRACE_FIELD
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#define TRACE_FIELD(type, item, assign)\
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entry->item = assign;
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#undef TRACE_FIELD
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#define TRACE_FIELD(type, item, assign)\
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entry->item = assign;
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#undef TP_CMD
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#define TP_CMD(cmd...) cmd
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#undef TRACE_ENTRY
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#define TRACE_ENTRY entry
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#undef TRACE_FIELD_SPECIAL
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#define TRACE_FIELD_SPECIAL(type_item, item, len, cmd) \
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cmd;
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#undef TRACE_EVENT_FORMAT
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#define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt) \
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int ftrace_define_fields_##call(void); \
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static int ftrace_raw_init_event_##call(void); \
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\
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struct ftrace_event_call __used \
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__attribute__((__aligned__(4))) \
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__attribute__((section("_ftrace_events"))) event_##call = { \
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.name = #call, \
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.id = proto, \
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.system = __stringify(TRACE_SYSTEM), \
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.raw_init = ftrace_raw_init_event_##call, \
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.show_format = ftrace_format_##call, \
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.define_fields = ftrace_define_fields_##call, \
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}; \
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static int ftrace_raw_init_event_##call(void) \
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{ \
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INIT_LIST_HEAD(&event_##call.fields); \
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init_preds(&event_##call); \
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return 0; \
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} \
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#undef TRACE_EVENT_FORMAT_NOFILTER
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#define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct, \
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tpfmt) \
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\
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struct ftrace_event_call __used \
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__attribute__((__aligned__(4))) \
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__attribute__((section("_ftrace_events"))) event_##call = { \
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.name = #call, \
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.id = proto, \
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.system = __stringify(TRACE_SYSTEM), \
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.show_format = ftrace_format_##call, \
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};
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#include "trace_event_types.h"
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#undef TRACE_FIELD
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#define TRACE_FIELD(type, item, assign) \
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ret = trace_define_field(event_call, #type, #item, \
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offsetof(typeof(field), item), \
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sizeof(field.item)); \
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if (ret) \
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return ret;
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#undef TRACE_FIELD_SPECIAL
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#define TRACE_FIELD_SPECIAL(type, item, len, cmd) \
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ret = trace_define_field(event_call, #type "[" #len "]", #item, \
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offsetof(typeof(field), item), \
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sizeof(field.item)); \
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if (ret) \
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return ret;
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#undef TRACE_FIELD_ZERO_CHAR
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#define TRACE_FIELD_ZERO_CHAR(item)
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#undef TRACE_EVENT_FORMAT
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#define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt) \
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int \
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ftrace_define_fields_##call(void) \
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{ \
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struct ftrace_event_call *event_call = &event_##call; \
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struct args field; \
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int ret; \
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\
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__common_field(unsigned char, type); \
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__common_field(unsigned char, flags); \
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__common_field(unsigned char, preempt_count); \
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__common_field(int, pid); \
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__common_field(int, tgid); \
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\
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tstruct; \
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\
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return ret; \
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}
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#undef TRACE_EVENT_FORMAT_NOFILTER
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#define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct, \
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tpfmt)
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#include "trace_event_types.h"
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