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