1  /*
       2   * Copyright (c) 2015 Dmitry V. Levin <ldv@strace.io>
       3   * Copyright (c) 2015-2022 The strace developers.
       4   * All rights reserved.
       5   *
       6   * SPDX-License-Identifier: LGPL-2.1-or-later
       7   */
       8  
       9  #include "defs.h"
      10  #include <linux/memfd.h>
      11  #include "xlat/memfd_create_flags.h"
      12  
      13  #ifndef MFD_NAME_MAX_LEN
      14  # define MFD_NAME_MAX_LEN (255 - (sizeof("memfd:") - 1))
      15  #endif
      16  
      17  SYS_FUNC(memfd_create)
      18  {
      19  	/* name */
      20  	printstr_ex(tcp, tcp->u_arg[0], MFD_NAME_MAX_LEN + 1,
      21  		    QUOTE_0_TERMINATED);
      22  	tprint_arg_next();
      23  
      24  	unsigned int flags = tcp->u_arg[1];
      25  
      26  	if (!flags || xlat_verbose(xlat_verbosity) != XLAT_STYLE_ABBREV)
      27  		PRINT_VAL_X(flags);
      28  
      29  	if (!flags || xlat_verbose(xlat_verbosity) == XLAT_STYLE_RAW)
      30  		return RVAL_DECODED | RVAL_FD;
      31  
      32  	if (xlat_verbose(xlat_verbosity) == XLAT_STYLE_VERBOSE)
      33  		tprint_comment_begin();
      34  
      35  	const unsigned int mask = MFD_HUGE_MASK << MFD_HUGE_SHIFT;
      36  	const unsigned int hugetlb_value = flags & mask;
      37  	flags &= ~mask;
      38  
      39  	tprint_flags_begin();
      40  
      41  	if (flags || !hugetlb_value)
      42  		printflags_ex(flags, "MFD_???", XLAT_STYLE_ABBREV,
      43  			      memfd_create_flags, NULL);
      44  
      45  	if (hugetlb_value) {
      46  		if (flags)
      47  			tprint_flags_or();
      48  		tprint_shift_begin();
      49  		PRINT_VAL_U(hugetlb_value >> MFD_HUGE_SHIFT);
      50  		tprint_shift();
      51  		/*
      52  		 * print_xlat_u is not used here because the whole thing
      53  		 * is potentially inside a comment already.
      54  		 */
      55  		tprints_string("MFD_HUGE_SHIFT");
      56  		tprint_shift_end();
      57  	}
      58  
      59  	tprint_flags_end();
      60  
      61  	if (xlat_verbose(xlat_verbosity) == XLAT_STYLE_VERBOSE)
      62  		tprint_comment_end();
      63  
      64  	return RVAL_DECODED | RVAL_FD;
      65  }