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65 lines
2.2 KiB
65 lines
2.2 KiB
/*
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* Copyright (c) 2015 Dmitry V. Levin <ldv@altlinux.org>
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* Copyright (c) 2015-2017 The strace developers.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "defs.h"
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#ifdef HAVE_LINUX_MEMFD_H
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# include <linux/memfd.h>
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#endif
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#include "xlat/memfd_create_flags.h"
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#ifndef MFD_HUGE_SHIFT
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# define MFD_HUGE_SHIFT 26
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#endif
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#ifndef MFD_HUGE_MASK
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# define MFD_HUGE_MASK 0x3f
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#endif
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SYS_FUNC(memfd_create)
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{
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printpathn(tcp, tcp->u_arg[0], 255 - (sizeof("memfd:") - 1));
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tprints(", ");
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unsigned int flags = tcp->u_arg[1];
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const unsigned int mask = MFD_HUGE_MASK << MFD_HUGE_SHIFT;
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const unsigned int hugetlb_value = flags & mask;
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flags &= ~mask;
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if (flags || !hugetlb_value)
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printflags(memfd_create_flags, flags, "MFD_???");
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if (hugetlb_value)
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tprintf("%s%u<<MFD_HUGE_SHIFT",
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flags ? "|" : "",
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hugetlb_value >> MFD_HUGE_SHIFT);
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return RVAL_DECODED | RVAL_FD;
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}
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