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 3 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, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "gdbcore.h"
  22 #include "solib-svr4.h"
  23
  24 #ifdef HAVE_LINK_H
  25
  26 #ifdef HAVE_NLIST_H
  27 /* nlist.h needs to be included before link.h on some older *BSD systems. */
  28 #include <nlist.h>
  29 #endif
  30
  31 #include <link.h>
  32
  33 /* Fetch (and possibly build) an appropriate link_map_offsets structure
  34    for native targets using struct definitions from link.h.  */
  35
  36 static struct link_map_offsets *
  37 legacy_svr4_fetch_link_map_offsets (void)
  38 {
  39   static struct link_map_offsets lmo;
  40   static struct link_map_offsets *lmp = 0;
  41 #if defined (HAVE_STRUCT_LINK_MAP32)
  42   static struct link_map_offsets lmo32;
  43   static struct link_map_offsets *lmp32 = 0;
  44 #endif
  45
  46 #ifndef offsetof
  47 #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
  48 #endif
  49 #define fieldsize(TYPE, MEMBER) (sizeof (((TYPE *)0)->MEMBER))
  50
  51   if (lmp == 0)
  52     {
  53       lmp = &lmo;
  54
  55 #ifdef HAVE_STRUCT_LINK_MAP_WITH_L_MEMBERS
  56       lmo.r_version_offset = offsetof (struct r_debug, r_version);
  57       lmo.r_version_size = fieldsize (struct r_debug, r_version);
  58       lmo.r_map_offset = offsetof (struct r_debug, r_map);
  59       lmo.r_ldsomap_offset = -1;
  60
  61       lmo.link_map_size = sizeof (struct link_map);
  62
  63       lmo.l_addr_offset = offsetof (struct link_map, l_addr);
  64       lmo.l_next_offset = offsetof (struct link_map, l_next);
  65       lmo.l_ld_offset = offsetof (struct link_map, l_ld);
  66       lmo.l_prev_offset = offsetof (struct link_map, l_prev);
  67       lmo.l_name_offset = offsetof (struct link_map, l_name);
  68 #else /* !defined(HAVE_STRUCT_LINK_MAP_WITH_L_MEMBERS) */
  69 #ifdef HAVE_STRUCT_LINK_MAP_WITH_LM_MEMBERS
  70       lmo.link_map_size = sizeof (struct link_map);
  71
  72       lmo.l_addr_offset = offsetof (struct link_map, lm_addr);
  73       lmo.l_next_offset = offsetof (struct link_map, lm_next);
  74       /* FIXME: Is this the right field name, or is it available at all?  */
  75       lmo.l_ld_offset = offsetof (struct link_map, lm_ld);
  76       lmo.l_name_offset = offsetof (struct link_map, lm_name);
  77 #else /* !defined(HAVE_STRUCT_LINK_MAP_WITH_LM_MEMBERS) */
  78 #if HAVE_STRUCT_SO_MAP_WITH_SOM_MEMBERS
  79       lmo.link_map_size = sizeof (struct so_map);
  80
  81       lmo.l_addr_offset = offsetof (struct so_map, som_addr);
  82       lmo.l_next_offset = offsetof (struct so_map, som_next);
  83       lmo.l_name_offset = offsetof (struct so_map, som_path);
  84       /* FIXME: Is the address of the dynamic table available?  */
  85       lmo.l_ld_offset = -1;
  86 #endif /* HAVE_STRUCT_SO_MAP_WITH_SOM_MEMBERS */
  87 #endif /* HAVE_STRUCT_LINK_MAP_WITH_LM_MEMBERS */
  88 #endif /* HAVE_STRUCT_LINK_MAP_WITH_L_MEMBERS */
  89     }
  90
  91 #if defined (HAVE_STRUCT_LINK_MAP32)
  92   if (lmp32 == 0)
  93     {
  94       lmp32 = &lmo32;
  95
  96       lmo32.r_version_offset = offsetof (struct r_debug32, r_version);
  97       lmo32.r_version_size = fieldsize (struct r_debug32, r_version);
  98       lmo32.r_map_offset = offsetof (struct r_debug32, r_map);
  99       lmo32.r_ldsomap_offset = -1;
 100
 101       lmo32.link_map_size = sizeof (struct link_map32);
 102
 103       lmo32.l_addr_offset = offsetof (struct link_map32, l_addr);
 104       lmo32.l_next_offset = offsetof (struct link_map32, l_next);
 105       lmo32.l_prev_offset = offsetof (struct link_map32, l_prev);
 106       lmo32.l_name_offset = offsetof (struct link_map32, l_name);
 107     }
 108 #endif /* defined (HAVE_STRUCT_LINK_MAP32) */
 109
 110 #if defined (HAVE_STRUCT_LINK_MAP32)
 111   if (exec_bfd != NULL)
 112     {
 113       if (bfd_get_arch_size (exec_bfd) == 32)
 114         return lmp32;
 115     }
 116   if (gdbarch_ptr_bit (current_gdbarch) == 32)
 117     return lmp32;
 118 #endif
 119   return lmp;
 120 }
 121
 122 #endif /* HAVE_LINK_H */
 123
 124 extern initialize_file_ftype _initialize_svr4_lm; /* -Wmissing-prototypes */
 125
 126 void
 127 _initialize_svr4_lm (void)
 128 {
 129 #ifdef HAVE_LINK_H
 130   legacy_svr4_fetch_link_map_offsets_hook = legacy_svr4_fetch_link_map_offsets;
 131 #endif /* HAVE_LINK_H */
 132 }