granicus.if.org Git - strace/blob - futex.c

   1 /*
   2  * Copyright (c) 2002-2003 Roland McGrath  <roland@redhat.com>
   3  * Copyright (c) 2007-2008 Ulrich Drepper <drepper@redhat.com>
   4  * Copyright (c) 2009 Andreas Schwab <schwab@redhat.com>
   5  * Copyright (c) 2014-2015 Dmitry V. Levin <ldv@altlinux.org>
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. The name of the author may not be used to endorse or promote products
  17  *    derived from this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 #include "defs.h"
  32
  33 #ifdef HAVE_LINUX_FUTEX_H
  34 # include <linux/futex.h>
  35 #endif
  36
  37 #ifndef FUTEX_PRIVATE_FLAG
  38 # define FUTEX_PRIVATE_FLAG 128
  39 #endif
  40 #ifndef FUTEX_CLOCK_REALTIME
  41 # define FUTEX_CLOCK_REALTIME 256
  42 #endif
  43
  44 #include "xlat/futexops.h"
  45 #include "xlat/futexwakeops.h"
  46 #include "xlat/futexwakecmps.h"
  47
  48 SYS_FUNC(futex)
  49 {
  50         const long uaddr = tcp->u_arg[0];
  51         const int op = tcp->u_arg[1];
  52         const int cmd = op & 127;
  53         const long timeout = tcp->u_arg[3];
  54         const long uaddr2 = tcp->u_arg[4];
  55         const unsigned int val = tcp->u_arg[2];
  56         const unsigned int val2 = tcp->u_arg[3];
  57         const unsigned int val3 = tcp->u_arg[5];
  58
  59         printaddr(uaddr);
  60         tprints(", ");
  61         printxval(futexops, op, "FUTEX_???");
  62         tprintf(", %u", val);
  63         switch (cmd) {
  64         case FUTEX_WAIT:
  65         case FUTEX_LOCK_PI:
  66                 tprints(", ");
  67                 print_timespec(tcp, timeout);
  68                 break;
  69         case FUTEX_WAIT_BITSET:
  70                 tprints(", ");
  71                 print_timespec(tcp, timeout);
  72                 tprintf(", %x", val3);
  73                 break;
  74         case FUTEX_WAKE_BITSET:
  75                 tprintf(", %x", val3);
  76                 break;
  77         case FUTEX_REQUEUE:
  78                 tprintf(", %u, ", val2);
  79                 printaddr(uaddr2);
  80                 break;
  81         case FUTEX_CMP_REQUEUE:
  82         case FUTEX_CMP_REQUEUE_PI:
  83                 tprintf(", %u, ", val2);
  84                 printaddr(uaddr2);
  85                 tprintf(", %u", val3);
  86                 break;
  87         case FUTEX_WAKE_OP:
  88                 tprintf(", %u, ", val2);
  89                 printaddr(uaddr2);
  90                 tprints(", {");
  91                 if ((val3 >> 28) & 8)
  92                         tprints("FUTEX_OP_OPARG_SHIFT|");
  93                 printxval(futexwakeops, (val3 >> 28) & 0x7, "FUTEX_OP_???");
  94                 tprintf(", %u, ", (val3 >> 12) & 0xfff);
  95                 if ((val3 >> 24) & 8)
  96                         tprints("FUTEX_OP_OPARG_SHIFT|");
  97                 printxval(futexwakecmps, (val3 >> 24) & 0x7, "FUTEX_OP_CMP_???");
  98                 tprintf(", %u}", val3 & 0xfff);
  99                 break;
 100         case FUTEX_WAIT_REQUEUE_PI:
 101                 tprints(", ");
 102                 print_timespec(tcp, timeout);
 103                 tprints(", ");
 104                 printaddr(uaddr2);
 105                 break;
 106         case FUTEX_WAKE:
 107         case FUTEX_UNLOCK_PI:
 108         case FUTEX_TRYLOCK_PI:
 109                 break;
 110         default:
 111                 tprintf(", %lx, %lx, %x", timeout, uaddr2, val3);
 112                 break;
 113         }
 114
 115         return RVAL_DECODED;
 116 }