diff options
Diffstat (limited to 'plugins/plugin_futex.c')
| -rw-r--r-- | plugins/plugin_futex.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/plugins/plugin_futex.c b/plugins/plugin_futex.c new file mode 100644 index 0000000..eb7c9f8 --- /dev/null +++ b/plugins/plugin_futex.c @@ -0,0 +1,123 @@ +// 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); +} |