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 extern initialize_file_ftype _initialize_svr4_lm; /* -Wmissing-prototypes */ 146 147 void 148 _initialize_svr4_lm (void) 149 { 150 #ifdef HAVE_LINK_H 151 legacy_svr4_fetch_link_map_offsets_hook = legacy_svr4_fetch_link_map_offsets; 152 #endif /* HAVE_LINK_H */ 153 } 154