root/mtcp/ldt.h

INCLUDED FROM

   1 /*****************************************************************************
   2  * Copyright (C) 2014 Kapil Arya <kapil@ccs.neu.edu>                         *
   3  * Copyright (C) 2014 Gene Cooperman <gene@ccs.neu.edu>                      *
   4  *                                                                           *
   5  * DMTCP is free software: you can redistribute it and/or                    *
   6  * modify it under the terms of the GNU Lesser General Public License as     *
   7  * published by the Free Software Foundation, either version 3 of the        *
   8  * License, or (at your option) any later version.                           *
   9  *                                                                           *
  10  * DMTCP is distributed in the hope that it will be useful,                  *
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of            *
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the             *
  13  * GNU Lesser General Public License for more details.                       *
  14  *                                                                           *
  15  * You should have received a copy of the GNU Lesser General Public          *
  16  * License along with DMTCP.  If not, see <http://www.gnu.org/licenses/>.    *
  17  *****************************************************************************/
  19 #ifndef LDT_H
  20 #define LDT_H
  21 #include <linux/version.h>
  22 // ARM is missing asm/ldt.h in Ubuntu 11.10 (Linux 3.0, glibc-2.13)
  23 #if defined(__arm__) || defined(__aarch64__)
  24 /* Structure passed to `modify_ldt', 'set_thread_area', and 'clone' calls.
  25    This seems to have been stable since the beginning of Linux 2.6  */
  26 struct user_desc
  27 {
  28   unsigned int entry_number;
  29   unsigned long int base_addr;
  30   unsigned int limit;
  31   unsigned int seg_32bit:1;
  32   unsigned int contents:2;
  33   unsigned int read_exec_only:1;
  34   unsigned int limit_in_pages:1;
  35   unsigned int seg_not_present:1;
  36   unsigned int useable:1;
  37   unsigned int empty:25;  /* Some variations leave this out. */
  38 };
  39 #else
  40    // Defines struct user_desc
  41 # include <asm/ldt.h>
  42   // WARNING: /usr/include/linux/version.h often has out-of-date version.
  43 /* struct user_desc * uinfo; */
  44 /* In Linux 2.6.9 for i386, uinfo->base_addr is
  45  *   correctly typed as unsigned long int.
  46  * In Linux 2.6.9, uinfo->base_addr is  incorrectly typed as
  47  *   unsigned int.  So, we'll just lie about the type.
  48  */
  49 /* SuSE Linux Enterprise Server 9 uses Linux 2.6.5 and requires original
  50  * struct user_desc from /usr/include/.../ldt.h
  51  * Perhaps kernel was patched by backport.  Let's not re-define user_desc.
  52  */
  53 /* RHEL 4 (Update 3) / Rocks 4.1.1-2.0 has <linux/version.h> saying
  54  *  LINUX_VERSION_CODE is 2.4.20 (and UTS_RELEASE=2.4.20)
  55  *  while uname -r says 2.6.9-34.ELsmp.  Here, it acts like a version earlier
  56  *  than the above 2.6.9.  So, we conditionalize on its 2.4.20 version.
  57  */
  58 # if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
  59    /* struct modify_ldt_ldt_s   was defined instead of   struct user_desc   */
  60 #  define user_desc modify_ldt_ldt_s
  61 # endif
  62 #endif
  64 #endif