1 /*
2 * Copyright (c) 2015 Dmitry V. Levin <ldv@altlinux.org>
3 * Copyright (c) 2015-2017 The strace developers.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include "defs.h"
30
31 #ifdef HAVE_LINUX_MEMFD_H
32 # include <linux/memfd.h>
33 #endif
34
35 #include "xlat/memfd_create_flags.h"
36
37 #ifndef MFD_HUGE_SHIFT
38 # define MFD_HUGE_SHIFT 26
39 #endif
40
41 #ifndef MFD_HUGE_MASK
42 # define MFD_HUGE_MASK 0x3f
43 #endif
44
SYS_FUNC(memfd_create)45 SYS_FUNC(memfd_create)
46 {
47 printpathn(tcp, tcp->u_arg[0], 255 - (sizeof("memfd:") - 1));
48 tprints(", ");
49
50 unsigned int flags = tcp->u_arg[1];
51 const unsigned int mask = MFD_HUGE_MASK << MFD_HUGE_SHIFT;
52 const unsigned int hugetlb_value = flags & mask;
53 flags &= ~mask;
54
55 if (flags || !hugetlb_value)
56 printflags(memfd_create_flags, flags, "MFD_???");
57
58 if (hugetlb_value)
59 tprintf("%s%u<<MFD_HUGE_SHIFT",
60 flags ? "|" : "",
61 hugetlb_value >> MFD_HUGE_SHIFT);
62
63 return RVAL_DECODED | RVAL_FD;
64 }
65