1 /* 2 * Copyright (c) 2015 Dmitry V. Levin <ldv (at) 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 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
