granicus.if.org Git - strace/blob - ldt.c

   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) 2002-2004 Roland McGrath <roland@redhat.com>
   7  * Copyright (c) 2010 Andreas Schwab <schwab@linux-m68k.org>
   8  * Copyright (c) 2014-2015 Dmitry V. Levin <ldv@altlinux.org>
   9  * Copyright (c) 2014-2017 The strace developers.
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. The name of the author may not be used to endorse or promote products
  21  *    derived from this software without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include "defs.h"
  36
  37 #ifdef HAVE_STRUCT_USER_DESC
  38
  39 # include <asm/ldt.h>
  40
  41 void
  42 print_user_desc(struct tcb *const tcp, const kernel_ulong_t addr)
  43 {
  44         struct user_desc desc;
  45
  46         if (umove_or_printaddr(tcp, addr, &desc))
  47                 return;
  48
  49         tprintf("{entry_number:%d, "
  50                 "base_addr:%#08x, "
  51                 "limit:%d, "
  52                 "seg_32bit:%d, "
  53                 "contents:%d, "
  54                 "read_exec_only:%d, "
  55                 "limit_in_pages:%d, "
  56                 "seg_not_present:%d, "
  57                 "useable:%d}",
  58                 desc.entry_number,
  59                 desc.base_addr,
  60                 desc.limit,
  61                 desc.seg_32bit,
  62                 desc.contents,
  63                 desc.read_exec_only,
  64                 desc.limit_in_pages,
  65                 desc.seg_not_present,
  66                 desc.useable);
  67 }
  68
  69 SYS_FUNC(modify_ldt)
  70 {
  71         tprintf("%" PRI_kld ", ", tcp->u_arg[0]);
  72         if (tcp->u_arg[2] != sizeof(struct user_desc))
  73                 printaddr(tcp->u_arg[1]);
  74         else
  75                 print_user_desc(tcp, tcp->u_arg[1]);
  76         tprintf(", %" PRI_klu, tcp->u_arg[2]);
  77
  78         return RVAL_DECODED;
  79 }
  80
  81 SYS_FUNC(set_thread_area)
  82 {
  83         if (entering(tcp)) {
  84                 print_user_desc(tcp, tcp->u_arg[0]);
  85         } else {
  86                 struct user_desc desc;
  87
  88                 if (!verbose(tcp) || syserror(tcp) ||
  89                     umove(tcp, tcp->u_arg[0], &desc) < 0) {
  90                         /* returned entry_number is not available */
  91                 } else {
  92                         static char outstr[32];
  93
  94                         sprintf(outstr, "entry_number:%d", desc.entry_number);
  95                         tcp->auxstr = outstr;
  96                         return RVAL_STR;
  97                 }
  98         }
  99         return 0;
 100 }
 101
 102 SYS_FUNC(get_thread_area)
 103 {
 104         if (exiting(tcp))
 105                 print_user_desc(tcp, tcp->u_arg[0]);
 106         return 0;
 107 }
 108
 109 #endif /* HAVE_STRUCT_USER_DESC */
 110
 111 #if defined(M68K) || defined(MIPS)
 112 SYS_FUNC(set_thread_area)
 113 {
 114         printaddr(tcp->u_arg[0]);
 115
 116         return RVAL_DECODED;
 117
 118 }
 119 #endif
 120
 121 #if defined(M68K)
 122 SYS_FUNC(get_thread_area)
 123 {
 124         return RVAL_DECODED | RVAL_HEX;
 125 }
 126 #endif