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 */
46SYS_FUNC(lseek)
47{
48	printfd(tcp, tcp->u_arg[0]);
49
50	kernel_long_t offset;
51
52# ifndef current_klongsize
53	if (current_klongsize < sizeof(kernel_long_t)) {
54		offset = (int) tcp->u_arg[1];
55	} else
56# endif /* !current_klongsize */
57	{
58		offset = tcp->u_arg[1];
59	}
60
61	tprintf(", %" PRI_kld ", ", offset);
62
63	printxval(whence_codes, tcp->u_arg[2], "SEEK_???");
64
65	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 */
80SYS_FUNC(llseek)
81{
82	if (entering(tcp)) {
83		printfd(tcp, tcp->u_arg[0]);
84		tprintf(", %lld, ",
85			  ((long long) tcp->u_arg[1] << 32)
86			| ((long long) tcp->u_arg[2]));
87	} else {
88		printnum_int64(tcp, tcp->u_arg[3], "%" PRIu64);
89		tprints(", ");
90		printxval(whence_codes, tcp->u_arg[4], "SEEK_???");
91	}
92	return 0;
93}
94