1 // SPDX-License-Identifier: LGPL-2.1
3 * Copyright (C) 2017 National Instruments Corp.
11 #include <linux/futex.h>
13 #include "event-parse.h"
15 #define ARRAY_SIZE(_a) (sizeof(_a) / sizeof((_a)[0]))
18 unsigned long long uaddr;
19 unsigned long long op;
20 unsigned long long val;
21 unsigned long long utime; /* or val2 */
22 unsigned long long uaddr2;
23 unsigned long long val3;
29 const char *fmt_utime;
30 const char *fmt_uaddr2;
34 static const struct futex_op futex_op_tbl[] = {
35 { "FUTEX_WAIT", " val=0x%08llx", " utime=0x%08llx", NULL, NULL },
36 { "FUTEX_WAKE", " val=%llu", NULL, NULL, NULL },
37 { "FUTEX_FD", " val=%llu", NULL, NULL, NULL },
38 { "FUTEX_REQUEUE", " val=%llu", " val2=%llu", " uaddr2=0x%08llx", NULL },
39 { "FUTEX_CMP_REQUEUE", " val=%llu", " val2=%llu", " uaddr2=0x%08llx", " val3=0x%08llx" },
40 { "FUTEX_WAKE_OP", " val=%llu", " val2=%llu", " uaddr2=0x%08llx", " val3=0x%08llx" },
41 { "FUTEX_LOCK_PI", NULL, " utime=0x%08llx", NULL, NULL },
42 { "FUTEX_UNLOCK_PI", NULL, NULL, NULL, NULL },
43 { "FUTEX_TRYLOCK_PI", NULL, NULL, NULL, NULL },
44 { "FUTEX_WAIT_BITSET", " val=0x%08llx", " utime=0x%08llx", NULL, " val3=0x%08llx" },
45 { "FUTEX_WAKE_BITSET", " val=%llu", NULL, NULL, " val3=0x%08llx" },
46 { "FUTEX_WAIT_REQUEUE_PI", " val=0x%08llx", " utime=0x%08llx", " uaddr2=0x%08llx", " val3=0x%08llx" },
47 { "FUTEX_CMP_REQUEUE_PI", " val=%llu", " val2=%llu", " uaddr2=0x%08llx", " val3=0x%08llx" },
51 static void futex_print(struct trace_seq *s, const struct futex_args *args,
52 const struct futex_op *fop)
54 trace_seq_printf(s, " uaddr=0x%08llx", args->uaddr);
57 trace_seq_printf(s, fop->fmt_val, args->val);
60 trace_seq_printf(s,fop->fmt_utime, args->utime);
63 trace_seq_printf(s, fop->fmt_uaddr2, args->uaddr2);
66 trace_seq_printf(s, fop->fmt_val3, args->val3);
69 static int futex_handler(struct trace_seq *s, struct tep_record *record,
70 struct tep_event *event, void *context)
72 const struct futex_op *fop;
73 struct futex_args args;
74 unsigned long long cmd;
76 if (tep_get_field_val(s, event, "uaddr", record, &args.uaddr, 1))
79 if (tep_get_field_val(s, event, "op", record, &args.op, 1))
82 if (tep_get_field_val(s, event, "val", record, &args.val, 1))
85 if (tep_get_field_val(s, event, "utime", record, &args.utime, 1))
88 if (tep_get_field_val(s, event, "uaddr2", record, &args.uaddr2, 1))
91 if (tep_get_field_val(s, event, "val3", record, &args.val3, 1))
94 cmd = args.op & FUTEX_CMD_MASK;
95 if (cmd >= ARRAY_SIZE(futex_op_tbl))
98 fop = &futex_op_tbl[cmd];
100 trace_seq_printf(s, "op=%s", fop->name);
102 if (args.op & FUTEX_PRIVATE_FLAG)
103 trace_seq_puts(s, "|FUTEX_PRIVATE_FLAG");
105 if (args.op & FUTEX_CLOCK_REALTIME)
106 trace_seq_puts(s, "|FUTEX_CLOCK_REALTIME");
108 futex_print(s, &args, fop);
112 int TEP_PLUGIN_LOADER(struct tep_handle *tep)
114 tep_register_event_handler(tep, -1, "syscalls", "sys_enter_futex",
115 futex_handler, NULL);
119 void TEP_PLUGIN_UNLOADER(struct tep_handle *tep)
121 tep_unregister_event_handler(tep, -1, "syscalls", "sys_enter_futex",
122 futex_handler, NULL);