Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 1 | /* Retrieve ELF descriptor used for DWARF access. |
| 2 | Copyright (C) 2002, 2003, 2004, 2005 Red Hat, Inc. |
Ulrich Drepper | 361df7d | 2006-04-04 21:38:57 +0000 | [diff] [blame] | 3 | This file is part of Red Hat elfutils. |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 4 | Written by Ulrich Drepper <drepper@redhat.com>, 2002. |
| 5 | |
Ulrich Drepper | 361df7d | 2006-04-04 21:38:57 +0000 | [diff] [blame] | 6 | Red Hat elfutils is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by the |
| 8 | Free Software Foundation; version 2 of the License. |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 9 | |
Ulrich Drepper | 361df7d | 2006-04-04 21:38:57 +0000 | [diff] [blame] | 10 | Red Hat elfutils is distributed in the hope that it will be useful, but |
| 11 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License along |
| 16 | with Red Hat elfutils; if not, write to the Free Software Foundation, |
Ulrich Drepper | 1e9ef50 | 2006-04-04 22:29:06 +0000 | [diff] [blame] | 17 | Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. |
Ulrich Drepper | 361df7d | 2006-04-04 21:38:57 +0000 | [diff] [blame] | 18 | |
| 19 | In addition, as a special exception, Red Hat, Inc. gives You the |
| 20 | additional right to link the code of Red Hat elfutils with code licensed |
| 21 | under any Open Source Initiative certified open source license |
| 22 | (http://www.opensource.org/licenses/index.php) which requires the |
| 23 | distribution of source code with any binary distribution and to |
| 24 | distribute linked combinations of the two. Non-GPL Code permitted under |
| 25 | this exception must only link to the code of Red Hat elfutils through |
| 26 | those well defined interfaces identified in the file named EXCEPTION |
| 27 | found in the source code files (the "Approved Interfaces"). The files |
| 28 | of Non-GPL Code may instantiate templates or use macros or inline |
| 29 | functions from the Approved Interfaces without causing the resulting |
| 30 | work to be covered by the GNU General Public License. Only Red Hat, |
| 31 | Inc. may make changes or additions to the list of Approved Interfaces. |
| 32 | Red Hat's grant of this exception is conditioned upon your not adding |
| 33 | any new exceptions. If you wish to add a new Approved Interface or |
| 34 | exception, please contact Red Hat. You must obey the GNU General Public |
| 35 | License in all respects for all of the Red Hat elfutils code and other |
| 36 | code used in conjunction with Red Hat elfutils except the Non-GPL Code |
| 37 | covered by this exception. If you modify this file, you may extend this |
| 38 | exception to your version of the file, but you are not obligated to do |
| 39 | so. If you do not wish to provide this exception without modification, |
| 40 | you must delete this exception statement from your version and license |
| 41 | this file solely under the GPL without exception. |
| 42 | |
| 43 | Red Hat elfutils is an included package of the Open Invention Network. |
| 44 | An included package of the Open Invention Network is a package for which |
| 45 | Open Invention Network licensees cross-license their patents. No patent |
| 46 | license is granted, either expressly or impliedly, by designation as an |
| 47 | included package. Should you wish to participate in the Open Invention |
| 48 | Network licensing program, please visit www.openinventionnetwork.com |
| 49 | <http://www.openinventionnetwork.com>. */ |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 50 | |
| 51 | #ifdef HAVE_CONFIG_H |
| 52 | # include <config.h> |
| 53 | #endif |
| 54 | |
| 55 | #include <assert.h> |
| 56 | #include <stddef.h> |
| 57 | |
| 58 | #include "libdwP.h" |
| 59 | |
| 60 | |
| 61 | #ifdef USE_TLS |
| 62 | /* The error number. */ |
| 63 | static __thread int global_error; |
| 64 | #else |
| 65 | /* This is the key for the thread specific memory. */ |
| 66 | static tls_key_t key; |
| 67 | |
| 68 | /* The error number. Used in non-threaded programs. */ |
| 69 | static int global_error; |
| 70 | static bool threaded; |
| 71 | /* We need to initialize the thread-specific data. */ |
| 72 | once_define (static, once); |
| 73 | |
| 74 | /* The initialization and destruction functions. */ |
| 75 | static void init (void); |
| 76 | static void free_key_mem (void *mem); |
| 77 | #endif /* TLS */ |
| 78 | |
| 79 | |
| 80 | int |
| 81 | dwarf_errno (void) |
| 82 | { |
| 83 | int result; |
| 84 | |
| 85 | #ifndef USE_TLS |
| 86 | /* If we have not yet initialized the buffer do it now. */ |
| 87 | once_execute (once, init); |
| 88 | |
| 89 | if (threaded) |
| 90 | { |
| 91 | /* We do not allocate memory for the data. It is only a word. |
| 92 | We can store it in place of the pointer. */ |
| 93 | result = (intptr_t) getspecific (key); |
| 94 | |
| 95 | setspecific (key, (void *) (intptr_t) DWARF_E_NOERROR); |
| 96 | return result; |
| 97 | } |
| 98 | #endif /* TLS */ |
| 99 | |
| 100 | result = global_error; |
| 101 | global_error = DWARF_E_NOERROR; |
| 102 | return result; |
| 103 | } |
| 104 | INTDEF(dwarf_errno) |
| 105 | |
| 106 | |
| 107 | /* XXX For now we use string pointers. Once the table stablelizes |
| 108 | make it more DSO-friendly. */ |
| 109 | static const char *errmsgs[] = |
| 110 | { |
| 111 | [DWARF_E_NOERROR] = N_("no error"), |
| 112 | [DWARF_E_UNKNOWN_ERROR] = N_("unknown error"), |
| 113 | [DWARF_E_INVALID_ACCESS] = N_("invalid access"), |
| 114 | [DWARF_E_NO_REGFILE] = N_("no regular file"), |
| 115 | [DWARF_E_IO_ERROR] = N_("I/O error"), |
| 116 | [DWARF_E_INVALID_ELF] = N_("invalid ELF file"), |
| 117 | [DWARF_E_NO_DWARF] = N_("no DWARF information"), |
| 118 | [DWARF_E_NOELF] = N_("no ELF file"), |
| 119 | [DWARF_E_GETEHDR_ERROR] = N_("cannot get ELF header"), |
| 120 | [DWARF_E_NOMEM] = N_("out of memory"), |
| 121 | [DWARF_E_UNIMPL] = N_("not implemented"), |
| 122 | [DWARF_E_INVALID_CMD] = N_("invalid command"), |
| 123 | [DWARF_E_INVALID_VERSION] = N_("invalid version"), |
| 124 | [DWARF_E_INVALID_FILE] = N_("invalid file"), |
| 125 | [DWARF_E_NO_ENTRY] = N_("no entries found"), |
| 126 | [DWARF_E_INVALID_DWARF] = N_("invalid DWARF"), |
| 127 | [DWARF_E_NO_STRING] = N_("no string data"), |
| 128 | [DWARF_E_NO_ADDR] = N_("no address value"), |
| 129 | [DWARF_E_NO_CONSTANT] = N_("no constant value"), |
| 130 | [DWARF_E_NO_REFERENCE] = N_("no reference value"), |
| 131 | [DWARF_E_INVALID_REFERENCE] = N_("invalid reference value"), |
| 132 | [DWARF_E_NO_DEBUG_LINE] = N_(".debug_line section missing"), |
| 133 | [DWARF_E_INVALID_DEBUG_LINE] = N_("invalid .debug_line section"), |
| 134 | [DWARF_E_TOO_BIG] = N_("debug information too big"), |
| 135 | [DWARF_E_VERSION] = N_("invalid DWARF version"), |
| 136 | [DWARF_E_INVALID_DIR_IDX] = N_("invalid directory index"), |
| 137 | [DWARF_E_ADDR_OUTOFRANGE] = N_("address out of range"), |
| 138 | [DWARF_E_NO_LOCLIST] = N_("no location list value"), |
| 139 | [DWARF_E_NO_BLOCK] = N_("no block data"), |
| 140 | [DWARF_E_INVALID_LINE_IDX] = N_("invalid line index"), |
| 141 | [DWARF_E_INVALID_ARANGE_IDX] = N_("invalid address range index"), |
| 142 | [DWARF_E_NO_MATCH] = N_("no matching address range"), |
| 143 | [DWARF_E_NO_FLAG] = N_("no flag value"), |
| 144 | [DWARF_E_INVALID_OFFSET] = N_("invalid offset"), |
| 145 | [DWARF_E_NO_DEBUG_RANGES] = N_(".debug_ranges section missing"), |
| 146 | }; |
| 147 | #define nerrmsgs (sizeof (errmsgs) / sizeof (errmsgs[0])) |
| 148 | |
| 149 | |
| 150 | void |
| 151 | __libdw_seterrno (value) |
| 152 | int value; |
| 153 | { |
| 154 | #ifndef USE_TLS |
| 155 | /* If we have not yet initialized the buffer do it now. */ |
| 156 | once_execute (once, init); |
| 157 | |
| 158 | if (threaded) |
| 159 | /* We do not allocate memory for the data. It is only a word. |
| 160 | We can store it in place of the pointer. */ |
| 161 | setspecific (key, (void *) (intptr_t) value); |
| 162 | #endif /* TLS */ |
| 163 | |
| 164 | global_error = (value >= 0 && value < (int) nerrmsgs |
| 165 | ? value : DWARF_E_UNKNOWN_ERROR); |
| 166 | } |
| 167 | |
| 168 | |
| 169 | const char * |
| 170 | dwarf_errmsg (error) |
| 171 | int error; |
| 172 | { |
| 173 | int last_error; |
| 174 | |
| 175 | #ifndef USE_TLS |
| 176 | /* If we have not yet initialized the buffer do it now. */ |
| 177 | once_execute (once, init); |
| 178 | |
| 179 | if ((error == 0 || error == -1) && threaded) |
| 180 | /* We do not allocate memory for the data. It is only a word. |
| 181 | We can store it in place of the pointer. */ |
| 182 | last_error = (intptr_t) getspecific (key); |
| 183 | else |
| 184 | #endif /* TLS */ |
| 185 | last_error = global_error; |
| 186 | |
| 187 | if (error == 0) |
| 188 | return last_error != 0 ? _(errmsgs[last_error]) : NULL; |
| 189 | else if (error < -1 || error >= (int) nerrmsgs) |
| 190 | return _(errmsgs[DWARF_E_UNKNOWN_ERROR]); |
| 191 | |
| 192 | return _(errmsgs[error == -1 ? last_error : error]); |
| 193 | } |
Roland McGrath | 4959bf8 | 2005-08-09 10:31:08 +0000 | [diff] [blame] | 194 | INTDEF(dwarf_errmsg) |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 195 | |
| 196 | |
| 197 | #ifndef USE_TLS |
| 198 | /* Free the thread specific data, this is done if a thread terminates. */ |
| 199 | static void |
| 200 | free_key_mem (void *mem __attribute__ ((unused))) |
| 201 | { |
| 202 | setspecific (key, NULL); |
| 203 | } |
| 204 | |
| 205 | |
| 206 | /* Initialize the key for the global variable. */ |
| 207 | static void |
| 208 | init (void) |
| 209 | { |
| 210 | // XXX Screw you, gcc4, the unused function attribute does not work. |
| 211 | __asm ("" :: "r" (free_key_mem)); |
| 212 | |
| 213 | if (key_create (&key, free_key_mem) == 0) |
| 214 | /* Creating the key succeeded. */ |
| 215 | threaded = true; |
| 216 | } |
| 217 | #endif /* TLS */ |