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Dmitry V. Levin38a34c92015-12-17 17:56:48 +00001/*
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>
Dmitry V. Levinddbede52016-02-15 18:30:02 +000010 * Copyright (c) 2014-2016 Dmitry V. Levin <ldv@altlinux.org>
Dmitry V. Levin38a34c92015-12-17 17:56:48 +000011 * 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
Dmitry V. Levinb5d25ec2014-12-06 03:53:16 +000036#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 * which means that on x32 we need to use tcp->ext_arg[N] to get offset argument.
45 * Use test/x32_lseek.c to test lseek decoding.
46 */
Dmitry V. Levinb0c51132016-06-17 16:12:13 +000047#if HAVE_STRUCT_TCB_EXT_ARG
Dmitry V. Levina0bd3742015-04-07 01:36:50 +000048SYS_FUNC(lseek)
Dmitry V. Levinb5d25ec2014-12-06 03:53:16 +000049{
Dmitry V. Levined88a502015-07-19 23:58:13 +000050 printfd(tcp, tcp->u_arg[0]);
Dmitry V. Levinddbede52016-02-15 18:30:02 +000051
52 long long offset;
Dmitry V. Levinb0c51132016-06-17 16:12:13 +000053# if SUPPORTED_PERSONALITIES > 1
54 /* tcp->ext_arg is not initialized for compat personality */
55 if (current_personality == 1) {
Dmitry V. Levina5aa0802015-12-04 16:42:30 +000056 offset = tcp->u_arg[1];
Dmitry V. Levinb0c51132016-06-17 16:12:13 +000057 } else
Dmitry V. Levina5aa0802015-12-04 16:42:30 +000058# endif
Dmitry V. Levinb0c51132016-06-17 16:12:13 +000059 {
60 offset = tcp->ext_arg[1];
61 }
Dmitry V. Levinddbede52016-02-15 18:30:02 +000062 int whence = tcp->u_arg[2];
63
64 tprintf(", %lld, ", offset);
Dmitry V. Levined88a502015-07-19 23:58:13 +000065 printxval(whence_codes, whence, "SEEK_???");
66
67 return RVAL_DECODED | RVAL_LUDECIMAL;
Dmitry V. Levinb5d25ec2014-12-06 03:53:16 +000068}
69#else
Dmitry V. Levina0bd3742015-04-07 01:36:50 +000070SYS_FUNC(lseek)
Dmitry V. Levinb5d25ec2014-12-06 03:53:16 +000071{
Dmitry V. Levined88a502015-07-19 23:58:13 +000072 printfd(tcp, tcp->u_arg[0]);
Dmitry V. Levinddbede52016-02-15 18:30:02 +000073
74 long offset =
75# if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
76# ifdef X86_64
77 current_personality == 1 ?
78 (long)(int) tcp->u_arg[1] : tcp->u_arg[1];
79# else
80 current_wordsize == 4 ?
81 (long)(int) tcp->u_arg[1] : tcp->u_arg[1];
82# endif
83# else
84 tcp->u_arg[1];
85# endif
86 int whence = tcp->u_arg[2];
87
88 tprintf(", %ld, ", offset);
Dmitry V. Levined88a502015-07-19 23:58:13 +000089 printxval(whence_codes, whence, "SEEK_???");
90
91 return RVAL_DECODED | RVAL_UDECIMAL;
Dmitry V. Levinb5d25ec2014-12-06 03:53:16 +000092}
93#endif
94
95/* llseek syscall takes explicitly two ulong arguments hi, lo,
96 * rather than one 64-bit argument for which LONG_LONG works
97 * appropriate for the native byte order.
98 *
99 * See kernel's fs/read_write.c::SYSCALL_DEFINE5(llseek, ...)
100 *
101 * hi,lo are "unsigned longs" and combined exactly this way in kernel:
102 * ((loff_t) hi << 32) | lo
103 * Note that for architectures with kernel's long wider than userspace long
104 * (such as x32), combining code will use *kernel's*, i.e. *wide* longs
105 * for hi and lo. We would need to use tcp->ext_arg[N] on x32...
106 * ...however, x32 (and x86_64) does not _have_ llseek syscall as such.
107 */
Dmitry V. Levina0bd3742015-04-07 01:36:50 +0000108SYS_FUNC(llseek)
Dmitry V. Levinb5d25ec2014-12-06 03:53:16 +0000109{
110 if (entering(tcp)) {
111 printfd(tcp, tcp->u_arg[0]);
Dmitry V. Levinddbede52016-02-15 18:30:02 +0000112 tprintf(", %lld, ",
Dmitry V. Levin84a979c2016-05-26 10:12:17 +0000113 (widen_to_ull(tcp->u_arg[1]) << 32)
114 | widen_to_ull(tcp->u_arg[2]));
Dmitry V. Levin7db808d2015-07-19 23:55:25 +0000115 } else {
116 printnum_int64(tcp, tcp->u_arg[3], "%" PRIu64);
117 tprints(", ");
Dmitry V. Levinb5d25ec2014-12-06 03:53:16 +0000118 printxval(whence_codes, tcp->u_arg[4], "SEEK_???");
119 }
120 return 0;
121}