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 #define _SYSCALL32      /* for Sparc64 cross Sparc32 */
  23 #include "defs.h"
  24 #include "gdbcore.h"
  25 #include "solib-svr4.h"
  26
  27 #ifdef HAVE_LINK_H
  28 #include <link.h>
  29
  30 /* Fetch (and possibly build) an appropriate link_map_offsets structure
  31    for native targets using struct definitions from link.h.  */
  32
  33 static struct link_map_offsets *
  34 legacy_svr4_fetch_link_map_offsets (void)
  35 {
  36   static struct link_map_offsets lmo;
  37   static struct link_map_offsets *lmp = 0;
  38 #if defined (HAVE_STRUCT_LINK_MAP32)
  39   static struct link_map_offsets lmo32;
  40   static struct link_map_offsets *lmp32 = 0;
  41 #endif
  42
  43 #ifndef offsetof
  44 #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
  45 #endif
  46 #define fieldsize(TYPE, MEMBER) (sizeof (((TYPE *)0)->MEMBER))
  47
  48   if (lmp == 0)
  49     {
  50       lmp = &lmo;
  51
  52 #ifdef SVR4_SHARED_LIBS
  53       lmo.r_debug_size = sizeof (struct r_debug);
  54
  55       lmo.r_map_offset = offsetof (struct r_debug, r_map);
  56       lmo.r_map_size = fieldsize (struct r_debug, r_map);
  57
  58       lmo.link_map_size = sizeof (struct link_map);
  59
  60       lmo.l_addr_offset = offsetof (struct link_map, l_addr);
  61       lmo.l_addr_size = fieldsize (struct link_map, l_addr);
  62
  63       lmo.l_next_offset = offsetof (struct link_map, l_next);
  64       lmo.l_next_size = fieldsize (struct link_map, l_next);
  65
  66       lmo.l_prev_offset = offsetof (struct link_map, l_prev);
  67       lmo.l_prev_size = fieldsize (struct link_map, l_prev);
  68
  69       lmo.l_name_offset = offsetof (struct link_map, l_name);
  70       lmo.l_name_size = fieldsize (struct link_map, l_name);
  71 #else /* !SVR4_SHARED_LIBS */
  72       lmo.link_map_size = sizeof (struct link_map);
  73
  74       lmo.l_addr_offset = offsetof (struct link_map, lm_addr);
  75       lmo.l_addr_size = fieldsize (struct link_map, lm_addr);
  76
  77       lmo.l_next_offset = offsetof (struct link_map, lm_next);
  78       lmo.l_next_size = fieldsize (struct link_map, lm_next);
  79
  80       lmo.l_name_offset = offsetof (struct link_map, lm_name);
  81       lmo.l_name_size = fieldsize (struct link_map, lm_name);
  82 #endif /* SVR4_SHARED_LIBS */
  83     }
  84
  85 #if defined (HAVE_STRUCT_LINK_MAP32)
  86   if (lmp32 == 0)
  87     {
  88       lmp32 = &lmo32;
  89
  90       lmo32.r_debug_size = sizeof (struct r_debug32);
  91
  92       lmo32.r_map_offset = offsetof (struct r_debug32, r_map);
  93       lmo32.r_map_size = fieldsize (struct r_debug32, r_map);
  94
  95       lmo32.link_map_size = sizeof (struct link_map32);
  96
  97       lmo32.l_addr_offset = offsetof (struct link_map32, l_addr);
  98       lmo32.l_addr_size = fieldsize (struct link_map32, l_addr);
  99
 100       lmo32.l_next_offset = offsetof (struct link_map32, l_next);
 101       lmo32.l_next_size = fieldsize (struct link_map32, l_next);
 102
 103       lmo32.l_prev_offset = offsetof (struct link_map32, l_prev);
 104       lmo32.l_prev_size = fieldsize (struct link_map32, l_prev);
 105
 106       lmo32.l_name_offset = offsetof (struct link_map32, l_name);
 107       lmo32.l_name_size = fieldsize (struct link_map32, l_name);
 108     }
 109 #endif /* defined (HAVE_STRUCT_LINK_MAP32) */
 110
 111 #if defined (HAVE_STRUCT_LINK_MAP32)
 112   if (bfd_get_arch_size (exec_bfd) == 32)
 113     return lmp32;
 114   else
 115 #endif
 116     return lmp;
 117 }
 118
 119 #endif /* HAVE_LINK_H */
 120
 121 void
 122 _initialize_svr4_lm (void)
 123 {
 124 #ifdef HAVE_LINK_H
 125   legacy_svr4_fetch_link_map_offsets_hook = legacy_svr4_fetch_link_map_offsets;
 126 #endif /* HAVE_LINK_H */
 127 }