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.
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
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.
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.
38 #include "xlat/whence_codes.h"
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.
47 #if HAVE_STRUCT_TCB_EXT_ARG
50 printfd(tcp, tcp->u_arg[0]);
53 # ifndef current_klongsize
54 /* tcp->ext_arg is not initialized for compat personality */
55 if (current_klongsize < sizeof(*tcp->ext_arg)) {
56 offset = (long) tcp->u_arg[1];
58 # endif /* !current_klongsize */
60 offset = tcp->ext_arg[1];
62 int whence = tcp->u_arg[2];
64 tprintf(", %lld, ", offset);
65 printxval(whence_codes, whence, "SEEK_???");
67 return RVAL_DECODED | RVAL_LUDECIMAL;
72 printfd(tcp, tcp->u_arg[0]);
75 # ifndef current_klongsize
76 current_klongsize < sizeof(long) ?
77 (long) (int) tcp->u_arg[1] : (long) tcp->u_arg[1];
81 int whence = tcp->u_arg[2];
83 tprintf(", %ld, ", offset);
84 printxval(whence_codes, whence, "SEEK_???");
86 return RVAL_DECODED | RVAL_UDECIMAL;
90 /* llseek syscall takes explicitly two ulong arguments hi, lo,
91 * rather than one 64-bit argument for which LONG_LONG works
92 * appropriate for the native byte order.
94 * See kernel's fs/read_write.c::SYSCALL_DEFINE5(llseek, ...)
96 * hi,lo are "unsigned longs" and combined exactly this way in kernel:
97 * ((loff_t) hi << 32) | lo
98 * Note that for architectures with kernel's long wider than userspace long
99 * (such as x32), combining code will use *kernel's*, i.e. *wide* longs
100 * for hi and lo. We would need to use tcp->ext_arg[N] on x32...
101 * ...however, x32 (and x86_64) does not _have_ llseek syscall as such.
106 printfd(tcp, tcp->u_arg[0]);
108 (zero_extend_signed_to_ull(tcp->u_arg[1]) << 32)
109 | zero_extend_signed_to_ull(tcp->u_arg[2]));
111 printnum_int64(tcp, tcp->u_arg[3], "%" PRIu64);
113 printxval(whence_codes, tcp->u_arg[4], "SEEK_???");