cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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plugin_futex.c (3842B)

      1// SPDX-License-Identifier: LGPL-2.1
      2/*
      3 * Copyright (C) 2017 National Instruments Corp.
      4 *
      5 * Author: Julia Cartwright <julia@ni.com>
      6 *
      7 */
      8#include <stdio.h>
      9#include <stdlib.h>
     10#include <string.h>
     11#include <linux/futex.h>
     12
     13#include "event-parse.h"
     14
     15#define ARRAY_SIZE(_a) (sizeof(_a) / sizeof((_a)[0]))
     16
     17struct futex_args {
     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;
     24};
     25
     26struct futex_op {
     27	const char	*name;
     28	const char	*fmt_val;
     29	const char	*fmt_utime;
     30	const char	*fmt_uaddr2;
     31	const char	*fmt_val3;
     32};
     33
     34static 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" },
     48};
     49
     50
     51static void futex_print(struct trace_seq *s, const struct futex_args *args,
     52			const struct futex_op *fop)
     53{
     54	trace_seq_printf(s, " uaddr=0x%08llx", args->uaddr);
     55
     56	if (fop->fmt_val)
     57		trace_seq_printf(s, fop->fmt_val, args->val);
     58
     59	if (fop->fmt_utime)
     60		trace_seq_printf(s,fop->fmt_utime, args->utime);
     61
     62	if (fop->fmt_uaddr2)
     63		trace_seq_printf(s, fop->fmt_uaddr2, args->uaddr2);
     64
     65	if (fop->fmt_val3)
     66		trace_seq_printf(s, fop->fmt_val3, args->val3);
     67}
     68
     69static int futex_handler(struct trace_seq *s, struct tep_record *record,
     70			 struct tep_event *event, void *context)
     71{
     72	const struct futex_op *fop;
     73	struct futex_args args;
     74	unsigned long long cmd;
     75
     76	if (tep_get_field_val(s, event, "uaddr", record, &args.uaddr, 1))
     77		return 1;
     78
     79	if (tep_get_field_val(s, event, "op", record, &args.op, 1))
     80		return 1;
     81
     82	if (tep_get_field_val(s, event, "val", record, &args.val, 1))
     83		return 1;
     84
     85	if (tep_get_field_val(s, event, "utime", record, &args.utime, 1))
     86		return 1;
     87
     88	if (tep_get_field_val(s, event, "uaddr2", record, &args.uaddr2, 1))
     89		return 1;
     90
     91	if (tep_get_field_val(s, event, "val3", record, &args.val3, 1))
     92		return 1;
     93
     94	cmd = args.op & FUTEX_CMD_MASK;
     95	if (cmd >= ARRAY_SIZE(futex_op_tbl))
     96		return 1;
     97
     98	fop = &futex_op_tbl[cmd];
     99
    100	trace_seq_printf(s, "op=%s", fop->name);
    101
    102	if (args.op & FUTEX_PRIVATE_FLAG)
    103		trace_seq_puts(s, "|FUTEX_PRIVATE_FLAG");
    104
    105	if (args.op & FUTEX_CLOCK_REALTIME)
    106		trace_seq_puts(s, "|FUTEX_CLOCK_REALTIME");
    107
    108	futex_print(s, &args, fop);
    109	return 0;
    110}
    111
    112int TEP_PLUGIN_LOADER(struct tep_handle *tep)
    113{
    114	tep_register_event_handler(tep, -1, "syscalls", "sys_enter_futex",
    115				   futex_handler, NULL);
    116	return 0;
    117}
    118
    119void TEP_PLUGIN_UNLOADER(struct tep_handle *tep)
    120{
    121	tep_unregister_event_handler(tep, -1, "syscalls", "sys_enter_futex",
    122				     futex_handler, NULL);
    123}