| 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 | } |