1  /*
       2   * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
       3   * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
       4   * Copyright (c) 1993-1996 Rick Sladkey <jrs@world.std.com>
       5   * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
       6   * Copyright (c) 2005 Roland McGrath <roland@redhat.com>
       7   * Copyright (c) 2007-2015 Dmitry V. Levin <ldv@strace.io>
       8   * Copyright (c) 2014-2022 The strace developers.
       9   * All rights reserved.
      10   *
      11   * SPDX-License-Identifier: LGPL-2.1-or-later
      12   */
      13  
      14  #include "defs.h"
      15  
      16  #define MS_MGC_VAL	0xc0ed0000	/* old magic mount flag number */
      17  #define MS_MGC_MSK	0xffff0000	/* old magic mount flag mask */
      18  
      19  #include "xlat/mount_flags.h"
      20  
      21  SYS_FUNC(mount)
      22  {
      23  	bool ignore_type = false;
      24  	bool ignore_data = false;
      25  	bool old_magic = false;
      26  	kernel_ulong_t flags = tcp->u_arg[3];
      27  
      28  	/* Discard magic */
      29  	if ((flags & MS_MGC_MSK) == MS_MGC_VAL) {
      30  		flags &= ~MS_MGC_MSK;
      31  		old_magic = true;
      32  	}
      33  
      34  	if (flags & MS_REMOUNT)
      35  		ignore_type = true;
      36  	else if (flags & (MS_BIND | MS_MOVE | MS_SHARED
      37  			  | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE))
      38  		ignore_type = ignore_data = true;
      39  
      40  	/* source */
      41  	printpath(tcp, tcp->u_arg[0]);
      42  	tprint_arg_next();
      43  
      44  	/* target */
      45  	printpath(tcp, tcp->u_arg[1]);
      46  	tprint_arg_next();
      47  
      48  	/* filesystemtype */
      49  	if (ignore_type)
      50  		printaddr(tcp->u_arg[2]);
      51  	else
      52  		printstr(tcp, tcp->u_arg[2]);
      53  	tprint_arg_next();
      54  
      55  	/* mountflags */
      56  	tprint_flags_begin();
      57  	if (old_magic) {
      58  		print_xlat(MS_MGC_VAL);
      59  		if (flags)
      60  			tprint_flags_or();
      61  	}
      62  	if (flags || !old_magic)
      63  		printflags64_in(mount_flags, flags, "MS_???");
      64  	tprint_flags_end();
      65  	tprint_arg_next();
      66  
      67  	/* data */
      68  	if (ignore_data)
      69  		printaddr(tcp->u_arg[4]);
      70  	else
      71  		printstr(tcp, tcp->u_arg[4]);
      72  
      73  	return RVAL_DECODED;
      74  }