gdb/solib-legacy.c

   1 /* Provide legacy r_debug and link_map support for SVR4-like native targets.
   2
   3    Copyright (C) 2000, 2001, 2006
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  21    Boston, MA 02110-1301, USA.  */
  22
  23 #include "defs.h"
  24 #include "gdbcore.h"
  25 #include "solib-svr4.h"
  26
  27 #ifdef HAVE_LINK_H
  28
  29 #ifdef HAVE_NLIST_H
  30 /* nlist.h needs to be included before link.h on some older *BSD systems. */
  31 #include <nlist.h>
  32 #endif
  33
  34 #include <link.h>
  35
  36 /* Fetch (and possibly build) an appropriate link_map_offsets structure
  37    for native targets using struct definitions from link.h.  */
  38
  39 static struct link_map_offsets *
  40 legacy_svr4_fetch_link_map_offsets (void)
  41 {
  42   static struct link_map_offsets lmo;
  43   static struct link_map_offsets *lmp = 0;
  44 #if defined (HAVE_STRUCT_LINK_MAP32)
  45   static struct link_map_offsets lmo32;
  46   static struct link_map_offsets *lmp32 = 0;
  47 #endif
  48
  49 #ifndef offsetof
  50 #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
  51 #endif
  52 #define fieldsize(TYPE, MEMBER) (sizeof (((TYPE *)0)->MEMBER))
  53
  54   if (lmp == 0)
  55     {
  56       lmp = &lmo;
  57
  58 #ifdef HAVE_STRUCT_LINK_MAP_WITH_L_MEMBERS
  59       lmo.r_version_offset = offsetof (struct r_debug, r_version);
  60       lmo.r_version_size = fieldsize (struct r_debug, r_version);
  61       lmo.r_map_offset = offsetof (struct r_debug, r_map);
  62       lmo.r_ldsomap_offset = -1;
  63
  64       lmo.link_map_size = sizeof (struct link_map);
  65
  66       lmo.l_addr_offset = offsetof (struct link_map, l_addr);
  67       lmo.l_addr_size = fieldsize (struct link_map, l_addr);
  68
  69       lmo.l_next_offset = offsetof (struct link_map, l_next);
  70       lmo.l_next_size = fieldsize (struct link_map, l_next);
  71
  72       lmo.l_prev_offset = offsetof (struct link_map, l_prev);
  73       lmo.l_prev_size = fieldsize (struct link_map, l_prev);
  74
  75       lmo.l_name_offset = offsetof (struct link_map, l_name);
  76       lmo.l_name_size = fieldsize (struct link_map, l_name);
  77 #else /* !defined(HAVE_STRUCT_LINK_MAP_WITH_L_MEMBERS) */
  78 #ifdef HAVE_STRUCT_LINK_MAP_WITH_LM_MEMBERS
  79       lmo.link_map_size = sizeof (struct link_map);
  80
  81       lmo.l_addr_offset = offsetof (struct link_map, lm_addr);
  82       lmo.l_addr_size = fieldsize (struct link_map, lm_addr);
  83
  84       lmo.l_next_offset = offsetof (struct link_map, lm_next);
  85       lmo.l_next_size = fieldsize (struct link_map, lm_next);
  86
  87       lmo.l_name_offset = offsetof (struct link_map, lm_name);
  88       lmo.l_name_size = fieldsize (struct link_map, lm_name);
  89 #else /* !defined(HAVE_STRUCT_LINK_MAP_WITH_LM_MEMBERS) */
  90 #if HAVE_STRUCT_SO_MAP_WITH_SOM_MEMBERS
  91       lmo.link_map_size = sizeof (struct so_map);
  92
  93       lmo.l_addr_offset = offsetof (struct so_map, som_addr);
  94       lmo.l_addr_size = fieldsize (struct so_map, som_addr);
  95
  96       lmo.l_next_offset = offsetof (struct so_map, som_next);
  97       lmo.l_next_size = fieldsize (struct so_map, som_next);
  98
  99       lmo.l_name_offset = offsetof (struct so_map, som_path);
 100       lmo.l_name_size = fieldsize (struct so_map, som_path);
 101 #endif /* HAVE_STRUCT_SO_MAP_WITH_SOM_MEMBERS */
 102 #endif /* HAVE_STRUCT_LINK_MAP_WITH_LM_MEMBERS */
 103 #endif /* HAVE_STRUCT_LINK_MAP_WITH_L_MEMBERS */
 104     }
 105
 106 #if defined (HAVE_STRUCT_LINK_MAP32)
 107   if (lmp32 == 0)
 108     {
 109       lmp32 = &lmo32;
 110
 111       lmo32.r_version_offset = offsetof (struct r_debug32, r_version);
 112       lmo32.r_version_size = fieldsize (struct r_debug32, r_version);
 113       lmo32.r_map_offset = offsetof (struct r_debug32, r_map);
 114       lmo32.r_ldsomap_offset = -1;
 115
 116       lmo32.link_map_size = sizeof (struct link_map32);
 117
 118       lmo32.l_addr_offset = offsetof (struct link_map32, l_addr);
 119       lmo32.l_addr_size = fieldsize (struct link_map32, l_addr);
 120
 121       lmo32.l_next_offset = offsetof (struct link_map32, l_next);
 122       lmo32.l_next_size = fieldsize (struct link_map32, l_next);
 123
 124       lmo32.l_prev_offset = offsetof (struct link_map32, l_prev);
 125       lmo32.l_prev_size = fieldsize (struct link_map32, l_prev);
 126
 127       lmo32.l_name_offset = offsetof (struct link_map32, l_name);
 128       lmo32.l_name_size = fieldsize (struct link_map32, l_name);
 129     }
 130 #endif /* defined (HAVE_STRUCT_LINK_MAP32) */
 131
 132 #if defined (HAVE_STRUCT_LINK_MAP32)
 133   if (exec_bfd != NULL)
 134     {
 135       if (bfd_get_arch_size (exec_bfd) == 32)
 136         return lmp32;
 137     }
 138   if (TARGET_PTR_BIT == 32)
 139     return lmp32;
 140 #endif
 141   return lmp;
 142 }
 143
 144 #endif /* HAVE_LINK_H */
 145
 146 extern initialize_file_ftype _initialize_svr4_lm; /* -Wmissing-prototypes */
 147
 148 void
 149 _initialize_svr4_lm (void)
 150 {
 151 #ifdef HAVE_LINK_H
 152   legacy_svr4_fetch_link_map_offsets_hook = legacy_svr4_fetch_link_map_offsets;
 153 #endif /* HAVE_LINK_H */
 154 }