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, 2007 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., 51 Franklin Street, Fifth Floor,
  20    Boston, MA 02110-1301, 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_version_offset = offsetof (struct r_debug, r_version);
  59       lmo.r_version_size = fieldsize (struct r_debug, r_version);
  60       lmo.r_map_offset = offsetof (struct r_debug, r_map);
  61       lmo.r_ldsomap_offset = -1;
  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_next_offset = offsetof (struct link_map, l_next);
  67       lmo.l_ld_offset = offsetof (struct link_map, l_ld);
  68       lmo.l_prev_offset = offsetof (struct link_map, l_prev);
  69       lmo.l_name_offset = offsetof (struct link_map, l_name);
  70 #else /* !defined(HAVE_STRUCT_LINK_MAP_WITH_L_MEMBERS) */
  71 #ifdef HAVE_STRUCT_LINK_MAP_WITH_LM_MEMBERS
  72       lmo.link_map_size = sizeof (struct link_map);
  73
  74       lmo.l_addr_offset = offsetof (struct link_map, lm_addr);
  75       lmo.l_next_offset = offsetof (struct link_map, lm_next);
  76       /* FIXME: Is this the right field name, or is it available at all?  */
  77       lmo.l_ld_offset = offsetof (struct link_map, lm_ld);
  78       lmo.l_name_offset = offsetof (struct link_map, lm_name);
  79 #else /* !defined(HAVE_STRUCT_LINK_MAP_WITH_LM_MEMBERS) */
  80 #if HAVE_STRUCT_SO_MAP_WITH_SOM_MEMBERS
  81       lmo.link_map_size = sizeof (struct so_map);
  82
  83       lmo.l_addr_offset = offsetof (struct so_map, som_addr);
  84       lmo.l_next_offset = offsetof (struct so_map, som_next);
  85       lmo.l_name_offset = offsetof (struct so_map, som_path);
  86       /* FIXME: Is the address of the dynamic table available?  */
  87       lmo.l_ld_offset = -1;
  88 #endif /* HAVE_STRUCT_SO_MAP_WITH_SOM_MEMBERS */
  89 #endif /* HAVE_STRUCT_LINK_MAP_WITH_LM_MEMBERS */
  90 #endif /* HAVE_STRUCT_LINK_MAP_WITH_L_MEMBERS */
  91     }
  92
  93 #if defined (HAVE_STRUCT_LINK_MAP32)
  94   if (lmp32 == 0)
  95     {
  96       lmp32 = &lmo32;
  97
  98       lmo32.r_version_offset = offsetof (struct r_debug32, r_version);
  99       lmo32.r_version_size = fieldsize (struct r_debug32, r_version);
 100       lmo32.r_map_offset = offsetof (struct r_debug32, r_map);
 101       lmo32.r_ldsomap_offset = -1;
 102
 103       lmo32.link_map_size = sizeof (struct link_map32);
 104
 105       lmo32.l_addr_offset = offsetof (struct link_map32, l_addr);
 106       lmo32.l_next_offset = offsetof (struct link_map32, l_next);
 107       lmo32.l_prev_offset = offsetof (struct link_map32, l_prev);
 108       lmo32.l_name_offset = offsetof (struct link_map32, l_name);
 109     }
 110 #endif /* defined (HAVE_STRUCT_LINK_MAP32) */
 111
 112 #if defined (HAVE_STRUCT_LINK_MAP32)
 113   if (exec_bfd != NULL)
 114     {
 115       if (bfd_get_arch_size (exec_bfd) == 32)
 116         return lmp32;
 117     }
 118   if (TARGET_PTR_BIT == 32)
 119     return lmp32;
 120 #endif
 121   return lmp;
 122 }
 123
 124 #endif /* HAVE_LINK_H */
 125
 126 extern initialize_file_ftype _initialize_svr4_lm; /* -Wmissing-prototypes */
 127
 128 void
 129 _initialize_svr4_lm (void)
 130 {
 131 #ifdef HAVE_LINK_H
 132   legacy_svr4_fetch_link_map_offsets_hook = legacy_svr4_fetch_link_map_offsets;
 133 #endif /* HAVE_LINK_H */
 134 }