124 lines
3.8 KiB
C
124 lines
3.8 KiB
C
// SPDX-License-Identifier: LGPL-2.1
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/*
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* Copyright (C) 2017 National Instruments Corp.
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*
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* Author: Julia Cartwright <julia@ni.com>
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <linux/futex.h>
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#include "event-parse.h"
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#define ARRAY_SIZE(_a) (sizeof(_a) / sizeof((_a)[0]))
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struct futex_args {
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unsigned long long uaddr;
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unsigned long long op;
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unsigned long long val;
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unsigned long long utime; /* or val2 */
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unsigned long long uaddr2;
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unsigned long long val3;
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};
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struct futex_op {
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const char *name;
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const char *fmt_val;
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const char *fmt_utime;
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const char *fmt_uaddr2;
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const char *fmt_val3;
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};
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static const struct futex_op futex_op_tbl[] = {
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{ "FUTEX_WAIT", " val=0x%08llx", " utime=0x%08llx", NULL, NULL },
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{ "FUTEX_WAKE", " val=%llu", NULL, NULL, NULL },
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{ "FUTEX_FD", " val=%llu", NULL, NULL, NULL },
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{ "FUTEX_REQUEUE", " val=%llu", " val2=%llu", " uaddr2=0x%08llx", NULL },
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{ "FUTEX_CMP_REQUEUE", " val=%llu", " val2=%llu", " uaddr2=0x%08llx", " val3=0x%08llx" },
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{ "FUTEX_WAKE_OP", " val=%llu", " val2=%llu", " uaddr2=0x%08llx", " val3=0x%08llx" },
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{ "FUTEX_LOCK_PI", NULL, " utime=0x%08llx", NULL, NULL },
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{ "FUTEX_UNLOCK_PI", NULL, NULL, NULL, NULL },
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{ "FUTEX_TRYLOCK_PI", NULL, NULL, NULL, NULL },
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{ "FUTEX_WAIT_BITSET", " val=0x%08llx", " utime=0x%08llx", NULL, " val3=0x%08llx" },
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{ "FUTEX_WAKE_BITSET", " val=%llu", NULL, NULL, " val3=0x%08llx" },
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{ "FUTEX_WAIT_REQUEUE_PI", " val=0x%08llx", " utime=0x%08llx", " uaddr2=0x%08llx", " val3=0x%08llx" },
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{ "FUTEX_CMP_REQUEUE_PI", " val=%llu", " val2=%llu", " uaddr2=0x%08llx", " val3=0x%08llx" },
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};
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static void futex_print(struct trace_seq *s, const struct futex_args *args,
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const struct futex_op *fop)
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{
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trace_seq_printf(s, " uaddr=0x%08llx", args->uaddr);
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if (fop->fmt_val)
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trace_seq_printf(s, fop->fmt_val, args->val);
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if (fop->fmt_utime)
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trace_seq_printf(s,fop->fmt_utime, args->utime);
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if (fop->fmt_uaddr2)
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trace_seq_printf(s, fop->fmt_uaddr2, args->uaddr2);
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if (fop->fmt_val3)
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trace_seq_printf(s, fop->fmt_val3, args->val3);
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}
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static int futex_handler(struct trace_seq *s, struct tep_record *record,
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struct tep_event *event, void *context)
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{
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const struct futex_op *fop;
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struct futex_args args;
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unsigned long long cmd;
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if (tep_get_field_val(s, event, "uaddr", record, &args.uaddr, 1))
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return 1;
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if (tep_get_field_val(s, event, "op", record, &args.op, 1))
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return 1;
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if (tep_get_field_val(s, event, "val", record, &args.val, 1))
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return 1;
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if (tep_get_field_val(s, event, "utime", record, &args.utime, 1))
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return 1;
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if (tep_get_field_val(s, event, "uaddr2", record, &args.uaddr2, 1))
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return 1;
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if (tep_get_field_val(s, event, "val3", record, &args.val3, 1))
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return 1;
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cmd = args.op & FUTEX_CMD_MASK;
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if (cmd >= ARRAY_SIZE(futex_op_tbl))
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return 1;
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fop = &futex_op_tbl[cmd];
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trace_seq_printf(s, "op=%s", fop->name);
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if (args.op & FUTEX_PRIVATE_FLAG)
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trace_seq_puts(s, "|FUTEX_PRIVATE_FLAG");
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if (args.op & FUTEX_CLOCK_REALTIME)
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trace_seq_puts(s, "|FUTEX_CLOCK_REALTIME");
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futex_print(s, &args, fop);
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return 0;
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}
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int TEP_PLUGIN_LOADER(struct tep_handle *tep)
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{
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tep_register_event_handler(tep, -1, "syscalls", "sys_enter_futex",
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futex_handler, NULL);
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return 0;
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}
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void TEP_PLUGIN_UNLOADER(struct tep_handle *tep)
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{
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tep_unregister_event_handler(tep, -1, "syscalls", "sys_enter_futex",
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futex_handler, NULL);
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}
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