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| // SPDX-License-Identifier: LGPL-2.1
| /*
| * Copyright (C) 2017 National Instruments Corp.
| *
| * Author: Julia Cartwright <julia@ni.com>
| *
| */
| #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);
| }
|
|
