blob: 133ddd853bda373bc38726b607ceb8348f8d36f8 [file] [log] [blame]
/*
* Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
* Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
* Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
* Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
* Copyright (c) 2002-2005 Roland McGrath <roland@redhat.com>
* Copyright (c) 2009 Andreas Schwab <schwab@redhat.com>
* Copyright (c) 2012 H.J. Lu <hongjiu.lu@intel.com>
* Copyright (c) 2013 Denys Vlasenko <vda.linux@googlemail.com>
* Copyright (c) 2014-2016 Dmitry V. Levin <ldv@altlinux.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "defs.h"
#include "xlat/whence_codes.h"
/* Linux kernel has exactly one version of lseek:
* fs/read_write.c::SYSCALL_DEFINE3(lseek, unsigned, fd, off_t, offset, unsigned, origin)
* In kernel, off_t is always the same as (kernel's) long
* (see include/uapi/asm-generic/posix_types.h),
* which means that on x32 we need to use tcp->ext_arg[N] to get offset argument.
* Use test/x32_lseek.c to test lseek decoding.
*/
#if defined(LINUX_MIPSN32) || defined(X32)
SYS_FUNC(lseek)
{
printfd(tcp, tcp->u_arg[0]);
long long offset;
# ifdef X32
/* tcp->ext_arg is not initialized for i386 personality */
if (current_personality == 1)
offset = tcp->u_arg[1];
else
# endif
offset = tcp->ext_arg[1];
int whence = tcp->u_arg[2];
tprintf(", %lld, ", offset);
printxval(whence_codes, whence, "SEEK_???");
return RVAL_DECODED | RVAL_LUDECIMAL;
}
#else
SYS_FUNC(lseek)
{
printfd(tcp, tcp->u_arg[0]);
long offset =
# if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
# ifdef X86_64
current_personality == 1 ?
(long)(int) tcp->u_arg[1] : tcp->u_arg[1];
# else
current_wordsize == 4 ?
(long)(int) tcp->u_arg[1] : tcp->u_arg[1];
# endif
# else
tcp->u_arg[1];
# endif
int whence = tcp->u_arg[2];
tprintf(", %ld, ", offset);
printxval(whence_codes, whence, "SEEK_???");
return RVAL_DECODED | RVAL_UDECIMAL;
}
#endif
/* llseek syscall takes explicitly two ulong arguments hi, lo,
* rather than one 64-bit argument for which LONG_LONG works
* appropriate for the native byte order.
*
* See kernel's fs/read_write.c::SYSCALL_DEFINE5(llseek, ...)
*
* hi,lo are "unsigned longs" and combined exactly this way in kernel:
* ((loff_t) hi << 32) | lo
* Note that for architectures with kernel's long wider than userspace long
* (such as x32), combining code will use *kernel's*, i.e. *wide* longs
* for hi and lo. We would need to use tcp->ext_arg[N] on x32...
* ...however, x32 (and x86_64) does not _have_ llseek syscall as such.
*/
SYS_FUNC(llseek)
{
if (entering(tcp)) {
printfd(tcp, tcp->u_arg[0]);
tprintf(", %lld, ",
(widen_to_ull(tcp->u_arg[1]) << 32)
| widen_to_ull(tcp->u_arg[2]));
} else {
printnum_int64(tcp, tcp->u_arg[3], "%" PRIu64);
tprints(", ");
printxval(whence_codes, tcp->u_arg[4], "SEEK_???");
}
return 0;
}