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 #ifndef FUTEX_PRIVATE_FLAG
  34 # define FUTEX_PRIVATE_FLAG 128
  35 #endif
  36 #ifndef FUTEX_CLOCK_REALTIME
  37 # define FUTEX_CLOCK_REALTIME 256
  38 #endif
  39
  40 #include "xlat/futexops.h"
  41 #include "xlat/futexwakeops.h"
  42 #include "xlat/futexwakecmps.h"
  43
  44 SYS_FUNC(futex)
  45 {
  46         const long uaddr = tcp->u_arg[0];
  47         const int op = tcp->u_arg[1];
  48         const int cmd = op & 127;
  49         const long timeout = tcp->u_arg[3];
  50         const long uaddr2 = tcp->u_arg[4];
  51         const unsigned int val = tcp->u_arg[2];
  52         const unsigned int val2 = tcp->u_arg[3];
  53         const unsigned int val3 = tcp->u_arg[5];
  54
  55         printaddr(uaddr);
  56         tprints(", ");
  57         printxval(futexops, op, "FUTEX_???");
  58         switch (cmd) {
  59         case FUTEX_WAIT:
  60                 tprintf(", %u", val);
  61                 tprints(", ");
  62                 print_timespec(tcp, timeout);
  63                 break;
  64         case FUTEX_LOCK_PI:
  65                 tprints(", ");
  66                 print_timespec(tcp, timeout);
  67                 break;
  68         case FUTEX_WAIT_BITSET:
  69                 tprintf(", %u", val);
  70                 tprints(", ");
  71                 print_timespec(tcp, timeout);
  72                 tprintf(", %#x", val3);
  73                 break;
  74         case FUTEX_WAKE_BITSET:
  75                 tprintf(", %u", val);
  76                 tprintf(", %#x", val3);
  77                 break;
  78         case FUTEX_REQUEUE:
  79                 tprintf(", %u", val);
  80                 tprintf(", %u, ", val2);
  81                 printaddr(uaddr2);
  82                 break;
  83         case FUTEX_CMP_REQUEUE:
  84         case FUTEX_CMP_REQUEUE_PI:
  85                 tprintf(", %u", val);
  86                 tprintf(", %u, ", val2);
  87                 printaddr(uaddr2);
  88                 tprintf(", %u", val3);
  89                 break;
  90         case FUTEX_WAKE_OP:
  91                 tprintf(", %u", val);
  92                 tprintf(", %u, ", val2);
  93                 printaddr(uaddr2);
  94                 tprints(", {");
  95                 if ((val3 >> 28) & 8)
  96                         tprints("FUTEX_OP_OPARG_SHIFT|");
  97                 printxval(futexwakeops, (val3 >> 28) & 0x7, "FUTEX_OP_???");
  98                 tprintf(", %u, ", (val3 >> 12) & 0xfff);
  99                 printxval(futexwakecmps, (val3 >> 24) & 0xf, "FUTEX_OP_CMP_???");
 100                 tprintf(", %u}", val3 & 0xfff);
 101                 break;
 102         case FUTEX_WAIT_REQUEUE_PI:
 103                 tprintf(", %u", val);
 104                 tprints(", ");
 105                 print_timespec(tcp, timeout);
 106                 tprints(", ");
 107                 printaddr(uaddr2);
 108                 break;
 109         case FUTEX_FD:
 110         case FUTEX_WAKE:
 111                 tprintf(", %u", val);
 112                 break;
 113         case FUTEX_UNLOCK_PI:
 114         case FUTEX_TRYLOCK_PI:
 115                 break;
 116         default:
 117                 tprintf(", %u", val);
 118                 tprintf(", %#lx", timeout);
 119                 tprints(", ");
 120                 printaddr(uaddr2);
 121                 tprintf(", %#x", val3);
 122                 break;
 123         }
 124
 125         return RVAL_DECODED;
 126 }