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/*
* Copyright (C) 2017 National Instruments Corp.
*
* Author: Julia Cartwright <[email protected]>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License (not later!)
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, see <http://www.gnu.org/licenses>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <linux/futex.h>
#include "event-parse.h"
#define ARRAY_SIZE(_a) (sizeof(_a) / sizeof((_a)[0]))
struct futex_args {
unsigned long long uaddr;
unsigned long long op;
unsigned long long val;
unsigned long long utime; /* or val2 */
unsigned long long uaddr2;
unsigned long long val3;
};
struct futex_op {
const char *name;
const char *fmt_val;
const char *fmt_utime;
const char *fmt_uaddr2;
const char *fmt_val3;
};
static const struct futex_op futex_op_tbl[] = {
{ "FUTEX_WAIT", " val=0x%08llx", " utime=0x%08llx", NULL, NULL },
{ "FUTEX_WAKE", " val=%llu", NULL, NULL, NULL },
{ "FUTEX_FD", " val=%llu", NULL, NULL, NULL },
{ "FUTEX_REQUEUE", " val=%llu", " val2=%llu", " uaddr2=0x%08llx", NULL },
{ "FUTEX_CMP_REQUEUE", " val=%llu", " val2=%llu", " uaddr2=0x%08llx", " val3=0x%08llx" },
{ "FUTEX_WAKE_OP", " val=%llu", " val2=%llu", " uaddr2=0x%08llx", " val3=0x%08llx" },
{ "FUTEX_LOCK_PI", NULL, " utime=0x%08llx", NULL, NULL },
{ "FUTEX_UNLOCK_PI", NULL, NULL, NULL, NULL },
{ "FUTEX_TRYLOCK_PI", NULL, NULL, NULL, NULL },
{ "FUTEX_WAIT_BITSET", " val=0x%08llx", " utime=0x%08llx", NULL, " val3=0x%08llx" },
{ "FUTEX_WAKE_BITSET", " val=%llu", NULL, NULL, " val3=0x%08llx" },
{ "FUTEX_WAIT_REQUEUE_PI", " val=0x%08llx", " utime=0x%08llx", " uaddr2=0x%08llx", " val3=0x%08llx" },
{ "FUTEX_CMP_REQUEUE_PI", " val=%llu", " val2=%llu", " uaddr2=0x%08llx", " val3=0x%08llx" },
};
static void futex_print(struct trace_seq *s, const struct futex_args *args,
const struct futex_op *fop)
{
trace_seq_printf(s, " uaddr=0x%08llx", args->uaddr);
if (fop->fmt_val)
trace_seq_printf(s, fop->fmt_val, args->val);
if (fop->fmt_utime)
trace_seq_printf(s,fop->fmt_utime, args->utime);
if (fop->fmt_uaddr2)
trace_seq_printf(s, fop->fmt_uaddr2, args->uaddr2);
if (fop->fmt_val3)
trace_seq_printf(s, fop->fmt_val3, args->val3);
}
static int futex_handler(struct trace_seq *s, struct tep_record *record,
struct tep_event *event, void *context)
{
const struct futex_op *fop;
struct futex_args args;
unsigned long long cmd;
if (tep_get_field_val(s, event, "uaddr", record, &args.uaddr, 1))
return 1;
if (tep_get_field_val(s, event, "op", record, &args.op, 1))
return 1;
if (tep_get_field_val(s, event, "val", record, &args.val, 1))
return 1;
if (tep_get_field_val(s, event, "utime", record, &args.utime, 1))
return 1;
if (tep_get_field_val(s, event, "uaddr2", record, &args.uaddr2, 1))
return 1;
if (tep_get_field_val(s, event, "val3", record, &args.val3, 1))
return 1;
cmd = args.op & FUTEX_CMD_MASK;
if (cmd >= ARRAY_SIZE(futex_op_tbl))
return 1;
fop = &futex_op_tbl[cmd];
trace_seq_printf(s, "op=%s", fop->name);
if (args.op & FUTEX_PRIVATE_FLAG)
trace_seq_puts(s, "|FUTEX_PRIVATE_FLAG");
if (args.op & FUTEX_CLOCK_REALTIME)
trace_seq_puts(s, "|FUTEX_CLOCK_REALTIME");
futex_print(s, &args, fop);
return 0;
}
int TEP_PLUGIN_LOADER(struct tep_handle *tep)
{
tep_register_event_handler(tep, -1, "syscalls", "sys_enter_futex",
futex_handler, NULL);
return 0;
}
void TEP_PLUGIN_UNLOADER(struct tep_handle *tep)
{
tep_unregister_event_handler(tep, -1, "syscalls", "sys_enter_futex",
futex_handler, NULL);
}
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