gnu/dist/gdb6/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_ld_offset = offsetof (struct link_map, l_ld);
  73       lmo.l_ld_size = fieldsize (struct link_map, l_ld);
  74
  75       lmo.l_prev_offset = offsetof (struct link_map, l_prev);
  76       lmo.l_prev_size = fieldsize (struct link_map, l_prev);
  77
  78       lmo.l_name_offset = offsetof (struct link_map, l_name);
  79       lmo.l_name_size = fieldsize (struct link_map, l_name);
  80 #else /* !defined(HAVE_STRUCT_LINK_MAP_WITH_L_MEMBERS) */
  81 #ifdef HAVE_STRUCT_LINK_MAP_WITH_LM_MEMBERS
  82       lmo.link_map_size = sizeof (struct link_map);
  83
  84       lmo.l_addr_offset = offsetof (struct link_map, lm_addr);
  85       lmo.l_addr_size = fieldsize (struct link_map, lm_addr);
  86
  87       lmo.l_next_offset = offsetof (struct link_map, lm_next);
  88       lmo.l_next_size = fieldsize (struct link_map, lm_next);
  89
  90       /* FIXME: Is this the right field name, or is it available at all?  */
  91       lmo.l_ld_offset = offsetof (struct link_map, lm_ld);
  92       lmo.l_ld_size = fieldsize (struct link_map, lm_ld);
  93
  94       lmo.l_name_offset = offsetof (struct link_map, lm_name);
  95       lmo.l_name_size = fieldsize (struct link_map, lm_name);
  96 #else /* !defined(HAVE_STRUCT_LINK_MAP_WITH_LM_MEMBERS) */
  97 #if HAVE_STRUCT_SO_MAP_WITH_SOM_MEMBERS
  98       lmo.link_map_size = sizeof (struct so_map);
  99
 100       lmo.l_addr_offset = offsetof (struct so_map, som_addr);
 101       lmo.l_addr_size = fieldsize (struct so_map, som_addr);
 102
 103       lmo.l_next_offset = offsetof (struct so_map, som_next);
 104       lmo.l_next_size = fieldsize (struct so_map, som_next);
 105
 106       lmo.l_name_offset = offsetof (struct so_map, som_path);
 107       lmo.l_name_size = fieldsize (struct so_map, som_path);
 108
 109       /* FIXME: Is the address of the dynamic table available?  */
 110       lmo.l_ld_offset = 0;
 111       lmo.l_ld_size = 0;
 112 #endif /* HAVE_STRUCT_SO_MAP_WITH_SOM_MEMBERS */
 113 #endif /* HAVE_STRUCT_LINK_MAP_WITH_LM_MEMBERS */
 114 #endif /* HAVE_STRUCT_LINK_MAP_WITH_L_MEMBERS */
 115     }
 116
 117 #if defined (HAVE_STRUCT_LINK_MAP32)
 118   if (lmp32 == 0)
 119     {
 120       lmp32 = &lmo32;
 121
 122       lmo32.r_version_offset = offsetof (struct r_debug32, r_version);
 123       lmo32.r_version_size = fieldsize (struct r_debug32, r_version);
 124       lmo32.r_map_offset = offsetof (struct r_debug32, r_map);
 125       lmo32.r_ldsomap_offset = -1;
 126
 127       lmo32.link_map_size = sizeof (struct link_map32);
 128
 129       lmo32.l_addr_offset = offsetof (struct link_map32, l_addr);
 130       lmo32.l_addr_size = fieldsize (struct link_map32, l_addr);
 131
 132       lmo32.l_next_offset = offsetof (struct link_map32, l_next);
 133       lmo32.l_next_size = fieldsize (struct link_map32, l_next);
 134
 135       lmo32.l_prev_offset = offsetof (struct link_map32, l_prev);
 136       lmo32.l_prev_size = fieldsize (struct link_map32, l_prev);
 137
 138       lmo32.l_name_offset = offsetof (struct link_map32, l_name);
 139       lmo32.l_name_size = fieldsize (struct link_map32, l_name);
 140     }
 141 #endif /* defined (HAVE_STRUCT_LINK_MAP32) */
 142
 143 #if defined (HAVE_STRUCT_LINK_MAP32)
 144   if (exec_bfd != NULL)
 145     {
 146       if (bfd_get_arch_size (exec_bfd) == 32)
 147         return lmp32;
 148     }
 149   if (TARGET_PTR_BIT == 32)
 150     return lmp32;
 151 #endif
 152   return lmp;
 153 }
 154
 155 #endif /* HAVE_LINK_H */
 156
 157 extern initialize_file_ftype _initialize_svr4_lm; /* -Wmissing-prototypes */
 158
 159 void
 160 _initialize_svr4_lm (void)
 161 {
 162 #ifdef HAVE_LINK_H
 163   legacy_svr4_fetch_link_map_offsets_hook = legacy_svr4_fetch_link_map_offsets;
 164 #endif /* HAVE_LINK_H */
 165 }