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       1                 :            : /*
       2                 :            :  * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
       3                 :            :  * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
       4                 :            :  * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
       5                 :            :  * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
       6                 :            :  * Copyright (c) 2002-2005 Roland McGrath <roland@redhat.com>
       7                 :            :  * Copyright (c) 2009 Andreas Schwab <schwab@redhat.com>
       8                 :            :  * Copyright (c) 2012 H.J. Lu <hongjiu.lu@intel.com>
       9                 :            :  * Copyright (c) 2013 Denys Vlasenko <vda.linux@googlemail.com>
      10                 :            :  * Copyright (c) 2014-2016 Dmitry V. Levin <ldv@altlinux.org>
      11                 :            :  * All rights reserved.
      12                 :            :  *
      13                 :            :  * Redistribution and use in source and binary forms, with or without
      14                 :            :  * modification, are permitted provided that the following conditions
      15                 :            :  * are met:
      16                 :            :  * 1. Redistributions of source code must retain the above copyright
      17                 :            :  *    notice, this list of conditions and the following disclaimer.
      18                 :            :  * 2. Redistributions in binary form must reproduce the above copyright
      19                 :            :  *    notice, this list of conditions and the following disclaimer in the
      20                 :            :  *    documentation and/or other materials provided with the distribution.
      21                 :            :  * 3. The name of the author may not be used to endorse or promote products
      22                 :            :  *    derived from this software without specific prior written permission.
      23                 :            :  *
      24                 :            :  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
      25                 :            :  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
      26                 :            :  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
      27                 :            :  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
      28                 :            :  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
      29                 :            :  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      30                 :            :  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      31                 :            :  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      32                 :            :  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
      33                 :            :  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
      34                 :            :  */
      35                 :            : 
      36                 :            : #include "defs.h"
      37                 :            : 
      38                 :            : #include "xlat/whence_codes.h"
      39                 :            : 
      40                 :            : /* Linux kernel has exactly one version of lseek:
      41                 :            :  * fs/read_write.c::SYSCALL_DEFINE3(lseek, unsigned, fd, off_t, offset, unsigned, origin)
      42                 :            :  * In kernel, off_t is always the same as (kernel's) long
      43                 :            :  * (see include/uapi/asm-generic/posix_types.h).
      44                 :            :  * Use test/x32_lseek.c to test lseek decoding.
      45                 :            :  */
      46                 :          6 : SYS_FUNC(lseek)
      47                 :            : {
      48                 :          6 :         printfd(tcp, tcp->u_arg[0]);
      49                 :            : 
      50                 :            :         kernel_long_t offset;
      51                 :            : 
      52                 :            : # ifndef current_klongsize
      53         [ +  + ]:          6 :         if (current_klongsize < sizeof(kernel_long_t)) {
      54                 :          1 :                 offset = (int) tcp->u_arg[1];
      55                 :            :         } else
      56                 :            : # endif /* !current_klongsize */
      57                 :            :         {
      58                 :          5 :                 offset = tcp->u_arg[1];
      59                 :            :         }
      60                 :            : 
      61                 :          6 :         tprintf(", %" PRI_kld ", ", offset);
      62                 :            : 
      63                 :          6 :         printxval(whence_codes, tcp->u_arg[2], "SEEK_???");
      64                 :            : 
      65                 :          6 :         return RVAL_DECODED | RVAL_UDECIMAL;
      66                 :            : }
      67                 :            : 
      68                 :            : /* llseek syscall takes explicitly two ulong arguments hi, lo,
      69                 :            :  * rather than one 64-bit argument for which ULONG_LONG works
      70                 :            :  * appropriate for the native byte order.
      71                 :            :  *
      72                 :            :  * See kernel's fs/read_write.c::SYSCALL_DEFINE5(llseek, ...)
      73                 :            :  *
      74                 :            :  * hi,lo are "unsigned longs" and combined exactly this way in kernel:
      75                 :            :  * ((loff_t) hi << 32) | lo
      76                 :            :  * Note that for architectures with kernel's long wider than userspace long
      77                 :            :  * (such as x32), combining code will use *kernel's*, i.e. *wide* longs
      78                 :            :  * for hi and lo.
      79                 :            :  */
      80                 :          2 : SYS_FUNC(llseek)
      81                 :            : {
      82         [ +  + ]:          2 :         if (entering(tcp)) {
      83                 :          1 :                 printfd(tcp, tcp->u_arg[0]);
      84                 :          1 :                 tprintf(", %lld, ",
      85                 :          1 :                           ((long long) tcp->u_arg[1] << 32)
      86                 :          1 :                         | ((long long) tcp->u_arg[2]));
      87                 :            :         } else {
      88                 :          1 :                 printnum_int64(tcp, tcp->u_arg[3], "%" PRIu64);
      89                 :          1 :                 tprints(", ");
      90                 :          1 :                 printxval(whence_codes, tcp->u_arg[4], "SEEK_???");
      91                 :            :         }
      92                 :          2 :         return 0;
      93                 :            : }