gdb/solib-legacy.c

   1 /* Provide legacy r_debug and link_map support for SVR4-like native targets.
   2    Copyright 2000, 2001
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include "defs.h"
  23 #include "gdbcore.h"
  24 #include "solib-svr4.h"
  25
  26 #ifdef HAVE_LINK_H
  27
  28 #ifdef HAVE_NLIST_H
  29 /* nlist.h needs to be included before link.h on some older *BSD systems. */
  30 #include <nlist.h>
  31 #endif
  32
  33 #include <link.h>
  34
  35 /* Fetch (and possibly build) an appropriate link_map_offsets structure
  36    for native targets using struct definitions from link.h.  */
  37
  38 static struct link_map_offsets *
  39 legacy_svr4_fetch_link_map_offsets (void)
  40 {
  41   static struct link_map_offsets lmo;
  42   static struct link_map_offsets *lmp = 0;
  43 #if defined (HAVE_STRUCT_LINK_MAP32)
  44   static struct link_map_offsets lmo32;
  45   static struct link_map_offsets *lmp32 = 0;
  46 #endif
  47
  48 #ifndef offsetof
  49 #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
  50 #endif
  51 #define fieldsize(TYPE, MEMBER) (sizeof (((TYPE *)0)->MEMBER))
  52
  53   if (lmp == 0)
  54     {
  55       lmp = &lmo;
  56
  57 #ifdef HAVE_STRUCT_LINK_MAP_WITH_L_MEMBERS
  58       lmo.r_debug_size = sizeof (struct r_debug);
  59
  60       lmo.r_map_offset = offsetof (struct r_debug, r_map);
  61       lmo.r_map_size = fieldsize (struct r_debug, r_map);
  62
  63       lmo.link_map_size = sizeof (struct link_map);
  64
  65       lmo.l_addr_offset = offsetof (struct link_map, l_addr);
  66       lmo.l_addr_size = fieldsize (struct link_map, l_addr);
  67
  68       lmo.l_next_offset = offsetof (struct link_map, l_next);
  69       lmo.l_next_size = fieldsize (struct link_map, l_next);
  70
  71       lmo.l_prev_offset = offsetof (struct link_map, l_prev);
  72       lmo.l_prev_size = fieldsize (struct link_map, l_prev);
  73
  74       lmo.l_name_offset = offsetof (struct link_map, l_name);
  75       lmo.l_name_size = fieldsize (struct link_map, l_name);
  76 #else /* !defined(HAVE_STRUCT_LINK_MAP_WITH_L_MEMBERS) */
  77 #ifdef HAVE_STRUCT_LINK_MAP_WITH_LM_MEMBERS
  78       lmo.link_map_size = sizeof (struct link_map);
  79
  80       lmo.l_addr_offset = offsetof (struct link_map, lm_addr);
  81       lmo.l_addr_size = fieldsize (struct link_map, lm_addr);
  82
  83       lmo.l_next_offset = offsetof (struct link_map, lm_next);
  84       lmo.l_next_size = fieldsize (struct link_map, lm_next);
  85
  86       lmo.l_name_offset = offsetof (struct link_map, lm_name);
  87       lmo.l_name_size = fieldsize (struct link_map, lm_name);
  88 #else /* !defined(HAVE_STRUCT_LINK_MAP_WITH_LM_MEMBERS) */
  89 #if HAVE_STRUCT_SO_MAP_WITH_SOM_MEMBERS
  90       lmo.link_map_size = sizeof (struct so_map);
  91
  92       lmo.l_addr_offset = offsetof (struct so_map, som_addr);
  93       lmo.l_addr_size = fieldsize (struct so_map, som_addr);
  94
  95       lmo.l_next_offset = offsetof (struct so_map, som_next);
  96       lmo.l_next_size = fieldsize (struct so_map, som_next);
  97
  98       lmo.l_name_offset = offsetof (struct so_map, som_path);
  99       lmo.l_name_size = fieldsize (struct so_map, som_path);
 100 #endif /* HAVE_STRUCT_SO_MAP_WITH_SOM_MEMBERS */
 101 #endif /* HAVE_STRUCT_LINK_MAP_WITH_LM_MEMBERS */
 102 #endif /* HAVE_STRUCT_LINK_MAP_WITH_L_MEMBERS */
 103     }
 104
 105 #if defined (HAVE_STRUCT_LINK_MAP32)
 106   if (lmp32 == 0)
 107     {
 108       lmp32 = &lmo32;
 109
 110       lmo32.r_debug_size = sizeof (struct r_debug32);
 111
 112       lmo32.r_map_offset = offsetof (struct r_debug32, r_map);
 113       lmo32.r_map_size = fieldsize (struct r_debug32, r_map);
 114
 115       lmo32.link_map_size = sizeof (struct link_map32);
 116
 117       lmo32.l_addr_offset = offsetof (struct link_map32, l_addr);
 118       lmo32.l_addr_size = fieldsize (struct link_map32, l_addr);
 119
 120       lmo32.l_next_offset = offsetof (struct link_map32, l_next);
 121       lmo32.l_next_size = fieldsize (struct link_map32, l_next);
 122
 123       lmo32.l_prev_offset = offsetof (struct link_map32, l_prev);
 124       lmo32.l_prev_size = fieldsize (struct link_map32, l_prev);
 125
 126       lmo32.l_name_offset = offsetof (struct link_map32, l_name);
 127       lmo32.l_name_size = fieldsize (struct link_map32, l_name);
 128     }
 129 #endif /* defined (HAVE_STRUCT_LINK_MAP32) */
 130
 131 #if defined (HAVE_STRUCT_LINK_MAP32)
 132   if (exec_bfd != NULL)
 133     {
 134       if (bfd_get_arch_size (exec_bfd) == 32)
 135         return lmp32;
 136     }
 137   if (TARGET_PTR_BIT == 32)
 138     return lmp32;
 139 #endif
 140   return lmp;
 141 }
 142
 143 #endif /* HAVE_LINK_H */
 144
 145 void
 146 _initialize_svr4_lm (void)
 147 {
 148 #ifdef HAVE_LINK_H
 149   legacy_svr4_fetch_link_map_offsets_hook = legacy_svr4_fetch_link_map_offsets;
 150 #endif /* HAVE_LINK_H */
 151 }