| 1 | /* ELF emulation code for targets using elf.em. |
| 2 | Copyright (C) 1991-2019 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of the GNU Binutils. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 3 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 19 | MA 02110-1301, USA. */ |
| 20 | |
| 21 | #include "sysdep.h" |
| 22 | #include "bfd.h" |
| 23 | #include "libiberty.h" |
| 24 | #include "filenames.h" |
| 25 | #include "safe-ctype.h" |
| 26 | #include "bfdlink.h" |
| 27 | #include "ctf-api.h" |
| 28 | #include "ld.h" |
| 29 | #include "ldmain.h" |
| 30 | #include "ldmisc.h" |
| 31 | #include "ldexp.h" |
| 32 | #include "ldlang.h" |
| 33 | #include "ldfile.h" |
| 34 | #include "ldemul.h" |
| 35 | #include "ldbuildid.h" |
| 36 | #include <ldgram.h> |
| 37 | #include "elf-bfd.h" |
| 38 | #ifdef HAVE_GLOB |
| 39 | #include <glob.h> |
| 40 | #endif |
| 41 | #include "ldelf.h" |
| 42 | |
| 43 | struct dt_needed |
| 44 | { |
| 45 | bfd *by; |
| 46 | const char *name; |
| 47 | }; |
| 48 | |
| 49 | /* Style of .note.gnu.build-id section. */ |
| 50 | const char *ldelf_emit_note_gnu_build_id; |
| 51 | |
| 52 | /* These variables are required to pass information back and forth |
| 53 | between after_open and check_needed and stat_needed and vercheck. */ |
| 54 | |
| 55 | static struct bfd_link_needed_list *global_needed; |
| 56 | static lang_input_statement_type *global_found; |
| 57 | static struct stat global_stat; |
| 58 | static struct bfd_link_needed_list *global_vercheck_needed; |
| 59 | static bfd_boolean global_vercheck_failed; |
| 60 | |
| 61 | void |
| 62 | ldelf_after_parse (void) |
| 63 | { |
| 64 | if (bfd_link_pie (&link_info)) |
| 65 | link_info.flags_1 |= (bfd_vma) DF_1_PIE; |
| 66 | |
| 67 | if (bfd_link_executable (&link_info) |
| 68 | && link_info.nointerp) |
| 69 | { |
| 70 | if (link_info.dynamic_undefined_weak > 0) |
| 71 | einfo (_("%P: warning: -z dynamic-undefined-weak ignored\n")); |
| 72 | link_info.dynamic_undefined_weak = 0; |
| 73 | } |
| 74 | after_parse_default (); |
| 75 | } |
| 76 | |
| 77 | /* Handle the generation of DT_NEEDED tags. */ |
| 78 | |
| 79 | bfd_boolean |
| 80 | ldelf_load_symbols (lang_input_statement_type *entry) |
| 81 | { |
| 82 | int link_class = 0; |
| 83 | |
| 84 | /* Tell the ELF linker that we don't want the output file to have a |
| 85 | DT_NEEDED entry for this file, unless it is used to resolve |
| 86 | references in a regular object. */ |
| 87 | if (entry->flags.add_DT_NEEDED_for_regular) |
| 88 | link_class = DYN_AS_NEEDED; |
| 89 | |
| 90 | /* Tell the ELF linker that we don't want the output file to have a |
| 91 | DT_NEEDED entry for any dynamic library in DT_NEEDED tags from |
| 92 | this file at all. */ |
| 93 | if (!entry->flags.add_DT_NEEDED_for_dynamic) |
| 94 | link_class |= DYN_NO_ADD_NEEDED; |
| 95 | |
| 96 | if (entry->flags.just_syms |
| 97 | && (bfd_get_file_flags (entry->the_bfd) & DYNAMIC) != 0) |
| 98 | einfo (_("%F%P: %pB: --just-symbols may not be used on DSO\n"), |
| 99 | entry->the_bfd); |
| 100 | |
| 101 | if (link_class == 0 |
| 102 | || (bfd_get_file_flags (entry->the_bfd) & DYNAMIC) == 0) |
| 103 | return FALSE; |
| 104 | |
| 105 | bfd_elf_set_dyn_lib_class (entry->the_bfd, |
| 106 | (enum dynamic_lib_link_class) link_class); |
| 107 | |
| 108 | /* Continue on with normal load_symbols processing. */ |
| 109 | return FALSE; |
| 110 | } |
| 111 | |
| 112 | /* On Linux, it's possible to have different versions of the same |
| 113 | shared library linked against different versions of libc. The |
| 114 | dynamic linker somehow tags which libc version to use in |
| 115 | /etc/ld.so.cache, and, based on the libc that it sees in the |
| 116 | executable, chooses which version of the shared library to use. |
| 117 | |
| 118 | We try to do a similar check here by checking whether this shared |
| 119 | library needs any other shared libraries which may conflict with |
| 120 | libraries we have already included in the link. If it does, we |
| 121 | skip it, and try to find another shared library farther on down the |
| 122 | link path. |
| 123 | |
| 124 | This is called via lang_for_each_input_file. |
| 125 | GLOBAL_VERCHECK_NEEDED is the list of objects needed by the object |
| 126 | which we are checking. This sets GLOBAL_VERCHECK_FAILED if we find |
| 127 | a conflicting version. */ |
| 128 | |
| 129 | static void |
| 130 | ldelf_vercheck (lang_input_statement_type *s) |
| 131 | { |
| 132 | const char *soname; |
| 133 | struct bfd_link_needed_list *l; |
| 134 | |
| 135 | if (global_vercheck_failed) |
| 136 | return; |
| 137 | if (s->the_bfd == NULL |
| 138 | || (bfd_get_file_flags (s->the_bfd) & DYNAMIC) == 0) |
| 139 | return; |
| 140 | |
| 141 | soname = bfd_elf_get_dt_soname (s->the_bfd); |
| 142 | if (soname == NULL) |
| 143 | soname = lbasename (bfd_get_filename (s->the_bfd)); |
| 144 | |
| 145 | for (l = global_vercheck_needed; l != NULL; l = l->next) |
| 146 | { |
| 147 | const char *suffix; |
| 148 | |
| 149 | if (filename_cmp (soname, l->name) == 0) |
| 150 | { |
| 151 | /* Probably can't happen, but it's an easy check. */ |
| 152 | continue; |
| 153 | } |
| 154 | |
| 155 | if (strchr (l->name, '/') != NULL) |
| 156 | continue; |
| 157 | |
| 158 | suffix = strstr (l->name, ".so."); |
| 159 | if (suffix == NULL) |
| 160 | continue; |
| 161 | |
| 162 | suffix += sizeof ".so." - 1; |
| 163 | |
| 164 | if (filename_ncmp (soname, l->name, suffix - l->name) == 0) |
| 165 | { |
| 166 | /* Here we know that S is a dynamic object FOO.SO.VER1, and |
| 167 | the object we are considering needs a dynamic object |
| 168 | FOO.SO.VER2, and VER1 and VER2 are different. This |
| 169 | appears to be a version mismatch, so we tell the caller |
| 170 | to try a different version of this library. */ |
| 171 | global_vercheck_failed = TRUE; |
| 172 | return; |
| 173 | } |
| 174 | } |
| 175 | } |
| 176 | |
| 177 | |
| 178 | /* See if an input file matches a DT_NEEDED entry by running stat on |
| 179 | the file. */ |
| 180 | |
| 181 | static void |
| 182 | ldelf_stat_needed (lang_input_statement_type *s) |
| 183 | { |
| 184 | struct stat st; |
| 185 | const char *suffix; |
| 186 | const char *soname; |
| 187 | |
| 188 | if (global_found != NULL) |
| 189 | return; |
| 190 | if (s->the_bfd == NULL) |
| 191 | return; |
| 192 | |
| 193 | /* If this input file was an as-needed entry, and wasn't found to be |
| 194 | needed at the stage it was linked, then don't say we have loaded it. */ |
| 195 | if ((bfd_elf_get_dyn_lib_class (s->the_bfd) & DYN_AS_NEEDED) != 0) |
| 196 | return; |
| 197 | |
| 198 | if (bfd_stat (s->the_bfd, &st) != 0) |
| 199 | { |
| 200 | einfo (_("%P: %pB: bfd_stat failed: %E\n"), s->the_bfd); |
| 201 | return; |
| 202 | } |
| 203 | |
| 204 | /* Some operating systems, e.g. Windows, do not provide a meaningful |
| 205 | st_ino; they always set it to zero. (Windows does provide a |
| 206 | meaningful st_dev.) Do not indicate a duplicate library in that |
| 207 | case. While there is no guarantee that a system that provides |
| 208 | meaningful inode numbers will never set st_ino to zero, this is |
| 209 | merely an optimization, so we do not need to worry about false |
| 210 | negatives. */ |
| 211 | if (st.st_dev == global_stat.st_dev |
| 212 | && st.st_ino == global_stat.st_ino |
| 213 | && st.st_ino != 0) |
| 214 | { |
| 215 | global_found = s; |
| 216 | return; |
| 217 | } |
| 218 | |
| 219 | /* We issue a warning if it looks like we are including two |
| 220 | different versions of the same shared library. For example, |
| 221 | there may be a problem if -lc picks up libc.so.6 but some other |
| 222 | shared library has a DT_NEEDED entry of libc.so.5. This is a |
| 223 | heuristic test, and it will only work if the name looks like |
| 224 | NAME.so.VERSION. FIXME: Depending on file names is error-prone. |
| 225 | If we really want to issue warnings about mixing version numbers |
| 226 | of shared libraries, we need to find a better way. */ |
| 227 | |
| 228 | if (strchr (global_needed->name, '/') != NULL) |
| 229 | return; |
| 230 | suffix = strstr (global_needed->name, ".so."); |
| 231 | if (suffix == NULL) |
| 232 | return; |
| 233 | suffix += sizeof ".so." - 1; |
| 234 | |
| 235 | soname = bfd_elf_get_dt_soname (s->the_bfd); |
| 236 | if (soname == NULL) |
| 237 | soname = lbasename (s->filename); |
| 238 | |
| 239 | if (filename_ncmp (soname, global_needed->name, |
| 240 | suffix - global_needed->name) == 0) |
| 241 | einfo (_("%P: warning: %s, needed by %pB, may conflict with %s\n"), |
| 242 | global_needed->name, global_needed->by, soname); |
| 243 | } |
| 244 | |
| 245 | /* This function is called for each possible name for a dynamic object |
| 246 | named by a DT_NEEDED entry. The FORCE parameter indicates whether |
| 247 | to skip the check for a conflicting version. */ |
| 248 | |
| 249 | static bfd_boolean |
| 250 | ldelf_try_needed (struct dt_needed *needed, int force, int is_linux) |
| 251 | { |
| 252 | bfd *abfd; |
| 253 | const char *name = needed->name; |
| 254 | const char *soname; |
| 255 | int link_class; |
| 256 | |
| 257 | abfd = bfd_openr (name, bfd_get_target (link_info.output_bfd)); |
| 258 | if (abfd == NULL) |
| 259 | { |
| 260 | if (verbose) |
| 261 | info_msg (_("attempt to open %s failed\n"), name); |
| 262 | return FALSE; |
| 263 | } |
| 264 | |
| 265 | /* Linker needs to decompress sections. */ |
| 266 | abfd->flags |= BFD_DECOMPRESS; |
| 267 | |
| 268 | if (! bfd_check_format (abfd, bfd_object)) |
| 269 | { |
| 270 | bfd_close (abfd); |
| 271 | return FALSE; |
| 272 | } |
| 273 | if ((bfd_get_file_flags (abfd) & DYNAMIC) == 0) |
| 274 | { |
| 275 | bfd_close (abfd); |
| 276 | return FALSE; |
| 277 | } |
| 278 | |
| 279 | /* For DT_NEEDED, they have to match. */ |
| 280 | if (abfd->xvec != link_info.output_bfd->xvec) |
| 281 | { |
| 282 | bfd_close (abfd); |
| 283 | return FALSE; |
| 284 | } |
| 285 | |
| 286 | /* Check whether this object would include any conflicting library |
| 287 | versions. If FORCE is set, then we skip this check; we use this |
| 288 | the second time around, if we couldn't find any compatible |
| 289 | instance of the shared library. */ |
| 290 | |
| 291 | if (!force) |
| 292 | { |
| 293 | struct bfd_link_needed_list *needs; |
| 294 | |
| 295 | if (! bfd_elf_get_bfd_needed_list (abfd, &needs)) |
| 296 | einfo (_("%F%P: %pB: bfd_elf_get_bfd_needed_list failed: %E\n"), abfd); |
| 297 | |
| 298 | if (needs != NULL) |
| 299 | { |
| 300 | global_vercheck_needed = needs; |
| 301 | global_vercheck_failed = FALSE; |
| 302 | lang_for_each_input_file (ldelf_vercheck); |
| 303 | if (global_vercheck_failed) |
| 304 | { |
| 305 | bfd_close (abfd); |
| 306 | /* Return FALSE to force the caller to move on to try |
| 307 | another file on the search path. */ |
| 308 | return FALSE; |
| 309 | } |
| 310 | |
| 311 | /* But wait! It gets much worse. On Linux, if a shared |
| 312 | library does not use libc at all, we are supposed to skip |
| 313 | it the first time around in case we encounter a shared |
| 314 | library later on with the same name which does use the |
| 315 | version of libc that we want. This is much too horrible |
| 316 | to use on any system other than Linux. */ |
| 317 | if (is_linux) |
| 318 | { |
| 319 | struct bfd_link_needed_list *l; |
| 320 | |
| 321 | for (l = needs; l != NULL; l = l->next) |
| 322 | if (CONST_STRNEQ (l->name, "libc.so")) |
| 323 | break; |
| 324 | if (l == NULL) |
| 325 | { |
| 326 | bfd_close (abfd); |
| 327 | return FALSE; |
| 328 | } |
| 329 | } |
| 330 | } |
| 331 | } |
| 332 | |
| 333 | /* We've found a dynamic object matching the DT_NEEDED entry. */ |
| 334 | |
| 335 | /* We have already checked that there is no other input file of the |
| 336 | same name. We must now check again that we are not including the |
| 337 | same file twice. We need to do this because on many systems |
| 338 | libc.so is a symlink to, e.g., libc.so.1. The SONAME entry will |
| 339 | reference libc.so.1. If we have already included libc.so, we |
| 340 | don't want to include libc.so.1 if they are the same file, and we |
| 341 | can only check that using stat. */ |
| 342 | |
| 343 | if (bfd_stat (abfd, &global_stat) != 0) |
| 344 | einfo (_("%F%P: %pB: bfd_stat failed: %E\n"), abfd); |
| 345 | |
| 346 | /* First strip off everything before the last '/'. */ |
| 347 | soname = lbasename (bfd_get_filename (abfd)); |
| 348 | |
| 349 | if (verbose) |
| 350 | info_msg (_("found %s at %s\n"), soname, name); |
| 351 | |
| 352 | global_found = NULL; |
| 353 | lang_for_each_input_file (ldelf_stat_needed); |
| 354 | if (global_found != NULL) |
| 355 | { |
| 356 | /* Return TRUE to indicate that we found the file, even though |
| 357 | we aren't going to do anything with it. */ |
| 358 | return TRUE; |
| 359 | } |
| 360 | |
| 361 | /* Specify the soname to use. */ |
| 362 | bfd_elf_set_dt_needed_name (abfd, soname); |
| 363 | |
| 364 | /* Tell the ELF linker that we don't want the output file to have a |
| 365 | DT_NEEDED entry for this file, unless it is used to resolve |
| 366 | references in a regular object. */ |
| 367 | link_class = DYN_DT_NEEDED; |
| 368 | |
| 369 | /* Tell the ELF linker that we don't want the output file to have a |
| 370 | DT_NEEDED entry for this file at all if the entry is from a file |
| 371 | with DYN_NO_ADD_NEEDED. */ |
| 372 | if (needed->by != NULL |
| 373 | && (bfd_elf_get_dyn_lib_class (needed->by) & DYN_NO_ADD_NEEDED) != 0) |
| 374 | link_class |= DYN_NO_NEEDED | DYN_NO_ADD_NEEDED; |
| 375 | |
| 376 | bfd_elf_set_dyn_lib_class (abfd, (enum dynamic_lib_link_class) link_class); |
| 377 | |
| 378 | /* Add this file into the symbol table. */ |
| 379 | if (! bfd_link_add_symbols (abfd, &link_info)) |
| 380 | einfo (_("%F%P: %pB: error adding symbols: %E\n"), abfd); |
| 381 | |
| 382 | return TRUE; |
| 383 | } |
| 384 | |
| 385 | /* Search for a needed file in a path. */ |
| 386 | |
| 387 | static bfd_boolean |
| 388 | ldelf_search_needed (const char *path, struct dt_needed *n, int force, |
| 389 | int is_linux, int elfsize) |
| 390 | { |
| 391 | const char *s; |
| 392 | const char *name = n->name; |
| 393 | size_t len; |
| 394 | struct dt_needed needed; |
| 395 | |
| 396 | if (name[0] == '/') |
| 397 | return ldelf_try_needed (n, force, is_linux); |
| 398 | |
| 399 | if (path == NULL || *path == '\0') |
| 400 | return FALSE; |
| 401 | |
| 402 | needed.by = n->by; |
| 403 | needed.name = n->name; |
| 404 | |
| 405 | len = strlen (name); |
| 406 | while (1) |
| 407 | { |
| 408 | unsigned offset = 0; |
| 409 | char * var; |
| 410 | char *filename, *sset; |
| 411 | |
| 412 | s = strchr (path, config.rpath_separator); |
| 413 | if (s == NULL) |
| 414 | s = path + strlen (path); |
| 415 | |
| 416 | #if HAVE_DOS_BASED_FILE_SYSTEM |
| 417 | /* Assume a match on the second char is part of drive specifier. */ |
| 418 | else if (config.rpath_separator == ':' |
| 419 | && s == path + 1 |
| 420 | && ISALPHA (*path)) |
| 421 | { |
| 422 | s = strchr (s + 1, config.rpath_separator); |
| 423 | if (s == NULL) |
| 424 | s = path + strlen (path); |
| 425 | } |
| 426 | #endif |
| 427 | filename = (char *) xmalloc (s - path + len + 2); |
| 428 | if (s == path) |
| 429 | sset = filename; |
| 430 | else |
| 431 | { |
| 432 | memcpy (filename, path, s - path); |
| 433 | filename[s - path] = '/'; |
| 434 | sset = filename + (s - path) + 1; |
| 435 | } |
| 436 | strcpy (sset, name); |
| 437 | |
| 438 | /* PR 20535: Support the same pseudo-environment variables that |
| 439 | are supported by ld.so. Namely, $ORIGIN, $LIB and $PLATFORM. |
| 440 | Since there can be more than one occurrence of these tokens in |
| 441 | the path we loop until no more are found. Since we might not |
| 442 | be able to substitute some of the tokens we maintain an offset |
| 443 | into the filename for where we should begin our scan. */ |
| 444 | while ((var = strchr (filename + offset, '$')) != NULL) |
| 445 | { |
| 446 | /* The ld.so manual page does not say, but I am going to assume that |
| 447 | these tokens are terminated by a directory separator character |
| 448 | (/) or the end of the string. There is also an implication that |
| 449 | $ORIGIN should only be used at the start of a path, but that is |
| 450 | not enforced here. |
| 451 | |
| 452 | The ld.so manual page also states that it allows ${ORIGIN}, |
| 453 | ${LIB} and ${PLATFORM}, so these are supported as well. |
| 454 | |
| 455 | FIXME: The code could be a lot cleverer about allocating space |
| 456 | for the processed string. */ |
| 457 | char * end = strchr (var, '/'); |
| 458 | const char *replacement = NULL; |
| 459 | char * v = var + 1; |
| 460 | char * freeme = NULL; |
| 461 | unsigned flen = strlen (filename); |
| 462 | |
| 463 | if (end != NULL) |
| 464 | /* Temporarily terminate the filename at the end of the token. */ |
| 465 | * end = 0; |
| 466 | |
| 467 | if (*v == '{') |
| 468 | ++ v; |
| 469 | switch (*v++) |
| 470 | { |
| 471 | case 'O': |
| 472 | if (strcmp (v, "RIGIN") == 0 || strcmp (v, "RIGIN}") == 0) |
| 473 | { |
| 474 | /* ORIGIN - replace with the full path to the directory |
| 475 | containing the program or shared object. */ |
| 476 | if (needed.by == NULL) |
| 477 | { |
| 478 | if (link_info.output_bfd == NULL) |
| 479 | { |
| 480 | break; |
| 481 | } |
| 482 | else |
| 483 | replacement = bfd_get_filename (link_info.output_bfd); |
| 484 | } |
| 485 | else |
| 486 | replacement = bfd_get_filename (needed.by); |
| 487 | |
| 488 | if (replacement) |
| 489 | { |
| 490 | char * slash; |
| 491 | |
| 492 | if (replacement[0] == '/') |
| 493 | freeme = xstrdup (replacement); |
| 494 | else |
| 495 | { |
| 496 | char * current_dir = getpwd (); |
| 497 | |
| 498 | freeme = xmalloc (strlen (replacement) |
| 499 | + strlen (current_dir) + 2); |
| 500 | sprintf (freeme, "%s/%s", current_dir, replacement); |
| 501 | } |
| 502 | |
| 503 | replacement = freeme; |
| 504 | if ((slash = strrchr (replacement, '/')) != NULL) |
| 505 | * slash = 0; |
| 506 | } |
| 507 | } |
| 508 | break; |
| 509 | |
| 510 | case 'L': |
| 511 | if (strcmp (v, "IB") == 0 || strcmp (v, "IB}") == 0) |
| 512 | { |
| 513 | /* LIB - replace with "lib" in 32-bit environments |
| 514 | and "lib64" in 64-bit environments. */ |
| 515 | |
| 516 | switch (elfsize) |
| 517 | { |
| 518 | case 32: replacement = "lib"; break; |
| 519 | case 64: replacement = "lib64"; break; |
| 520 | default: |
| 521 | abort (); |
| 522 | } |
| 523 | } |
| 524 | break; |
| 525 | |
| 526 | case 'P': |
| 527 | /* Supporting $PLATFORM in a cross-hosted environment is not |
| 528 | possible. Supporting it in a native environment involves |
| 529 | loading the <sys/auxv.h> header file which loads the |
| 530 | system <elf.h> header file, which conflicts with the |
| 531 | "include/elf/mips.h" header file. */ |
| 532 | /* Fall through. */ |
| 533 | default: |
| 534 | break; |
| 535 | } |
| 536 | |
| 537 | if (replacement) |
| 538 | { |
| 539 | char * filename2 = xmalloc (flen + strlen (replacement)); |
| 540 | |
| 541 | if (end) |
| 542 | { |
| 543 | sprintf (filename2, "%.*s%s/%s", |
| 544 | (int)(var - filename), filename, |
| 545 | replacement, end + 1); |
| 546 | offset = (var - filename) + 1 + strlen (replacement); |
| 547 | } |
| 548 | else |
| 549 | { |
| 550 | sprintf (filename2, "%.*s%s", |
| 551 | (int)(var - filename), filename, |
| 552 | replacement); |
| 553 | offset = var - filename + strlen (replacement); |
| 554 | } |
| 555 | |
| 556 | free (filename); |
| 557 | filename = filename2; |
| 558 | /* There is no need to restore the path separator (when |
| 559 | end != NULL) as we have replaced the entire string. */ |
| 560 | } |
| 561 | else |
| 562 | { |
| 563 | if (verbose) |
| 564 | /* We only issue an "unrecognised" message in verbose mode |
| 565 | as the $<foo> token might be a legitimate component of |
| 566 | a path name in the target's file system. */ |
| 567 | info_msg (_("unrecognised or unsupported token " |
| 568 | "'%s' in search path\n"), var); |
| 569 | if (end) |
| 570 | /* Restore the path separator. */ |
| 571 | * end = '/'; |
| 572 | |
| 573 | /* PR 20784: Make sure that we resume the scan *after* |
| 574 | the token that we could not replace. */ |
| 575 | offset = (var + 1) - filename; |
| 576 | } |
| 577 | |
| 578 | free (freeme); |
| 579 | } |
| 580 | |
| 581 | needed.name = filename; |
| 582 | |
| 583 | if (ldelf_try_needed (&needed, force, is_linux)) |
| 584 | return TRUE; |
| 585 | |
| 586 | free (filename); |
| 587 | |
| 588 | if (*s == '\0') |
| 589 | break; |
| 590 | path = s + 1; |
| 591 | } |
| 592 | |
| 593 | return FALSE; |
| 594 | } |
| 595 | |
| 596 | /* Prefix the sysroot to absolute paths in PATH, a string containing |
| 597 | paths separated by config.rpath_separator. If running on a DOS |
| 598 | file system, paths containing a drive spec won't have the sysroot |
| 599 | prefix added, unless the sysroot also specifies the same drive. */ |
| 600 | |
| 601 | static const char * |
| 602 | ldelf_add_sysroot (const char *path) |
| 603 | { |
| 604 | size_t len, extra; |
| 605 | const char *p; |
| 606 | char *ret, *q; |
| 607 | int dos_drive_sysroot = HAS_DRIVE_SPEC (ld_sysroot); |
| 608 | |
| 609 | len = strlen (ld_sysroot); |
| 610 | for (extra = 0, p = path; ; ) |
| 611 | { |
| 612 | int dos_drive = HAS_DRIVE_SPEC (p); |
| 613 | |
| 614 | if (dos_drive) |
| 615 | p += 2; |
| 616 | if (IS_DIR_SEPARATOR (*p) |
| 617 | && (!dos_drive |
| 618 | || (dos_drive_sysroot |
| 619 | && ld_sysroot[0] == p[-2]))) |
| 620 | { |
| 621 | if (dos_drive && dos_drive_sysroot) |
| 622 | extra += len - 2; |
| 623 | else |
| 624 | extra += len; |
| 625 | } |
| 626 | p = strchr (p, config.rpath_separator); |
| 627 | if (!p) |
| 628 | break; |
| 629 | ++p; |
| 630 | } |
| 631 | |
| 632 | ret = xmalloc (strlen (path) + extra + 1); |
| 633 | |
| 634 | for (q = ret, p = path; ; ) |
| 635 | { |
| 636 | const char *end; |
| 637 | int dos_drive = HAS_DRIVE_SPEC (p); |
| 638 | |
| 639 | if (dos_drive) |
| 640 | { |
| 641 | *q++ = *p++; |
| 642 | *q++ = *p++; |
| 643 | } |
| 644 | if (IS_DIR_SEPARATOR (*p) |
| 645 | && (!dos_drive |
| 646 | || (dos_drive_sysroot |
| 647 | && ld_sysroot[0] == p[-2]))) |
| 648 | { |
| 649 | if (dos_drive && dos_drive_sysroot) |
| 650 | { |
| 651 | strcpy (q, ld_sysroot + 2); |
| 652 | q += len - 2; |
| 653 | } |
| 654 | else |
| 655 | { |
| 656 | strcpy (q, ld_sysroot); |
| 657 | q += len; |
| 658 | } |
| 659 | } |
| 660 | end = strchr (p, config.rpath_separator); |
| 661 | if (end) |
| 662 | { |
| 663 | size_t n = end - p + 1; |
| 664 | strncpy (q, p, n); |
| 665 | q += n; |
| 666 | p += n; |
| 667 | } |
| 668 | else |
| 669 | { |
| 670 | strcpy (q, p); |
| 671 | break; |
| 672 | } |
| 673 | } |
| 674 | |
| 675 | return ret; |
| 676 | } |
| 677 | |
| 678 | /* Read the system search path the FreeBSD way rather than the Linux way. */ |
| 679 | #ifdef HAVE_ELF_HINTS_H |
| 680 | #include <elf-hints.h> |
| 681 | #else |
| 682 | #include "elf-hints-local.h" |
| 683 | #endif |
| 684 | |
| 685 | static bfd_boolean |
| 686 | ldelf_check_ld_elf_hints (const struct bfd_link_needed_list *l, int force, |
| 687 | int elfsize) |
| 688 | { |
| 689 | static bfd_boolean initialized; |
| 690 | static const char *ld_elf_hints; |
| 691 | struct dt_needed needed; |
| 692 | |
| 693 | if (!initialized) |
| 694 | { |
| 695 | FILE *f; |
| 696 | char *tmppath; |
| 697 | |
| 698 | tmppath = concat (ld_sysroot, _PATH_ELF_HINTS, (const char *) NULL); |
| 699 | f = fopen (tmppath, FOPEN_RB); |
| 700 | free (tmppath); |
| 701 | if (f != NULL) |
| 702 | { |
| 703 | struct elfhints_hdr hdr; |
| 704 | |
| 705 | if (fread (&hdr, 1, sizeof (hdr), f) == sizeof (hdr) |
| 706 | && hdr.magic == ELFHINTS_MAGIC |
| 707 | && hdr.version == 1) |
| 708 | { |
| 709 | if (fseek (f, hdr.strtab + hdr.dirlist, SEEK_SET) != -1) |
| 710 | { |
| 711 | char *b; |
| 712 | |
| 713 | b = xmalloc (hdr.dirlistlen + 1); |
| 714 | if (fread (b, 1, hdr.dirlistlen + 1, f) == |
| 715 | hdr.dirlistlen + 1) |
| 716 | ld_elf_hints = ldelf_add_sysroot (b); |
| 717 | |
| 718 | free (b); |
| 719 | } |
| 720 | } |
| 721 | fclose (f); |
| 722 | } |
| 723 | |
| 724 | initialized = TRUE; |
| 725 | } |
| 726 | |
| 727 | if (ld_elf_hints == NULL) |
| 728 | return FALSE; |
| 729 | |
| 730 | needed.by = l->by; |
| 731 | needed.name = l->name; |
| 732 | return ldelf_search_needed (ld_elf_hints, &needed, force, FALSE, elfsize); |
| 733 | } |
| 734 | |
| 735 | /* For a native linker, check the file /etc/ld.so.conf for directories |
| 736 | in which we may find shared libraries. /etc/ld.so.conf is really |
| 737 | only meaningful on Linux. */ |
| 738 | |
| 739 | struct ldelf_ld_so_conf |
| 740 | { |
| 741 | char *path; |
| 742 | size_t len, alloc; |
| 743 | }; |
| 744 | |
| 745 | static bfd_boolean |
| 746 | ldelf_parse_ld_so_conf (struct ldelf_ld_so_conf *, const char *); |
| 747 | |
| 748 | static void |
| 749 | ldelf_parse_ld_so_conf_include (struct ldelf_ld_so_conf *info, |
| 750 | const char *filename, |
| 751 | const char *pattern) |
| 752 | { |
| 753 | char *newp = NULL; |
| 754 | #ifdef HAVE_GLOB |
| 755 | glob_t gl; |
| 756 | #endif |
| 757 | |
| 758 | if (pattern[0] != '/') |
| 759 | { |
| 760 | char *p = strrchr (filename, '/'); |
| 761 | size_t patlen = strlen (pattern) + 1; |
| 762 | |
| 763 | newp = xmalloc (p - filename + 1 + patlen); |
| 764 | memcpy (newp, filename, p - filename + 1); |
| 765 | memcpy (newp + (p - filename + 1), pattern, patlen); |
| 766 | pattern = newp; |
| 767 | } |
| 768 | |
| 769 | #ifdef HAVE_GLOB |
| 770 | if (glob (pattern, 0, NULL, &gl) == 0) |
| 771 | { |
| 772 | size_t i; |
| 773 | |
| 774 | for (i = 0; i < gl.gl_pathc; ++i) |
| 775 | ldelf_parse_ld_so_conf (info, gl.gl_pathv[i]); |
| 776 | globfree (&gl); |
| 777 | } |
| 778 | #else |
| 779 | /* If we do not have glob, treat the pattern as a literal filename. */ |
| 780 | ldelf_parse_ld_so_conf (info, pattern); |
| 781 | #endif |
| 782 | |
| 783 | if (newp) |
| 784 | free (newp); |
| 785 | } |
| 786 | |
| 787 | static bfd_boolean |
| 788 | ldelf_parse_ld_so_conf (struct ldelf_ld_so_conf *info, const char *filename) |
| 789 | { |
| 790 | FILE *f = fopen (filename, FOPEN_RT); |
| 791 | char *line; |
| 792 | size_t linelen; |
| 793 | |
| 794 | if (f == NULL) |
| 795 | return FALSE; |
| 796 | |
| 797 | linelen = 256; |
| 798 | line = xmalloc (linelen); |
| 799 | do |
| 800 | { |
| 801 | char *p = line, *q; |
| 802 | |
| 803 | /* Normally this would use getline(3), but we need to be portable. */ |
| 804 | while ((q = fgets (p, linelen - (p - line), f)) != NULL |
| 805 | && strlen (q) == linelen - (p - line) - 1 |
| 806 | && line[linelen - 2] != '\n') |
| 807 | { |
| 808 | line = xrealloc (line, 2 * linelen); |
| 809 | p = line + linelen - 1; |
| 810 | linelen += linelen; |
| 811 | } |
| 812 | |
| 813 | if (q == NULL && p == line) |
| 814 | break; |
| 815 | |
| 816 | p = strchr (line, '\n'); |
| 817 | if (p) |
| 818 | *p = '\0'; |
| 819 | |
| 820 | /* Because the file format does not know any form of quoting we |
| 821 | can search forward for the next '#' character and if found |
| 822 | make it terminating the line. */ |
| 823 | p = strchr (line, '#'); |
| 824 | if (p) |
| 825 | *p = '\0'; |
| 826 | |
| 827 | /* Remove leading whitespace. NUL is no whitespace character. */ |
| 828 | p = line; |
| 829 | while (*p == ' ' || *p == '\f' || *p == '\r' || *p == '\t' || *p == '\v') |
| 830 | ++p; |
| 831 | |
| 832 | /* If the line is blank it is ignored. */ |
| 833 | if (p[0] == '\0') |
| 834 | continue; |
| 835 | |
| 836 | if (CONST_STRNEQ (p, "include") && (p[7] == ' ' || p[7] == '\t')) |
| 837 | { |
| 838 | char *dir, c; |
| 839 | p += 8; |
| 840 | do |
| 841 | { |
| 842 | while (*p == ' ' || *p == '\t') |
| 843 | ++p; |
| 844 | |
| 845 | if (*p == '\0') |
| 846 | break; |
| 847 | |
| 848 | dir = p; |
| 849 | |
| 850 | while (*p != ' ' && *p != '\t' && *p) |
| 851 | ++p; |
| 852 | |
| 853 | c = *p; |
| 854 | *p++ = '\0'; |
| 855 | if (dir[0] != '\0') |
| 856 | ldelf_parse_ld_so_conf_include (info, filename, dir); |
| 857 | } |
| 858 | while (c != '\0'); |
| 859 | } |
| 860 | else |
| 861 | { |
| 862 | char *dir = p; |
| 863 | while (*p && *p != '=' && *p != ' ' && *p != '\t' && *p != '\f' |
| 864 | && *p != '\r' && *p != '\v') |
| 865 | ++p; |
| 866 | |
| 867 | while (p != dir && p[-1] == '/') |
| 868 | --p; |
| 869 | if (info->path == NULL) |
| 870 | { |
| 871 | info->alloc = p - dir + 1 + 256; |
| 872 | info->path = xmalloc (info->alloc); |
| 873 | info->len = 0; |
| 874 | } |
| 875 | else |
| 876 | { |
| 877 | if (info->len + 1 + (p - dir) >= info->alloc) |
| 878 | { |
| 879 | info->alloc += p - dir + 256; |
| 880 | info->path = xrealloc (info->path, info->alloc); |
| 881 | } |
| 882 | info->path[info->len++] = config.rpath_separator; |
| 883 | } |
| 884 | memcpy (info->path + info->len, dir, p - dir); |
| 885 | info->len += p - dir; |
| 886 | info->path[info->len] = '\0'; |
| 887 | } |
| 888 | } |
| 889 | while (! feof (f)); |
| 890 | free (line); |
| 891 | fclose (f); |
| 892 | return TRUE; |
| 893 | } |
| 894 | |
| 895 | static bfd_boolean |
| 896 | ldelf_check_ld_so_conf (const struct bfd_link_needed_list *l, int force, |
| 897 | int elfsize) |
| 898 | { |
| 899 | static bfd_boolean initialized; |
| 900 | static const char *ld_so_conf; |
| 901 | struct dt_needed needed; |
| 902 | |
| 903 | if (! initialized) |
| 904 | { |
| 905 | char *tmppath; |
| 906 | struct ldelf_ld_so_conf info; |
| 907 | |
| 908 | info.path = NULL; |
| 909 | info.len = info.alloc = 0; |
| 910 | tmppath = concat (ld_sysroot, "${prefix}/etc/ld.so.conf", |
| 911 | (const char *) NULL); |
| 912 | if (!ldelf_parse_ld_so_conf (&info, tmppath)) |
| 913 | { |
| 914 | free (tmppath); |
| 915 | tmppath = concat (ld_sysroot, "/etc/ld.so.conf", |
| 916 | (const char *) NULL); |
| 917 | ldelf_parse_ld_so_conf (&info, tmppath); |
| 918 | } |
| 919 | free (tmppath); |
| 920 | |
| 921 | if (info.path) |
| 922 | { |
| 923 | ld_so_conf = ldelf_add_sysroot (info.path); |
| 924 | free (info.path); |
| 925 | } |
| 926 | initialized = TRUE; |
| 927 | } |
| 928 | |
| 929 | if (ld_so_conf == NULL) |
| 930 | return FALSE; |
| 931 | |
| 932 | |
| 933 | needed.by = l->by; |
| 934 | needed.name = l->name; |
| 935 | return ldelf_search_needed (ld_so_conf, &needed, force, TRUE, elfsize); |
| 936 | } |
| 937 | |
| 938 | /* See if an input file matches a DT_NEEDED entry by name. */ |
| 939 | |
| 940 | static void |
| 941 | ldelf_check_needed (lang_input_statement_type *s) |
| 942 | { |
| 943 | const char *soname; |
| 944 | |
| 945 | /* Stop looking if we've found a loaded lib. */ |
| 946 | if (global_found != NULL |
| 947 | && (bfd_elf_get_dyn_lib_class (global_found->the_bfd) |
| 948 | & DYN_AS_NEEDED) == 0) |
| 949 | return; |
| 950 | |
| 951 | if (s->filename == NULL || s->the_bfd == NULL) |
| 952 | return; |
| 953 | |
| 954 | /* Don't look for a second non-loaded as-needed lib. */ |
| 955 | if (global_found != NULL |
| 956 | && (bfd_elf_get_dyn_lib_class (s->the_bfd) & DYN_AS_NEEDED) != 0) |
| 957 | return; |
| 958 | |
| 959 | if (filename_cmp (s->filename, global_needed->name) == 0) |
| 960 | { |
| 961 | global_found = s; |
| 962 | return; |
| 963 | } |
| 964 | |
| 965 | if (s->flags.search_dirs) |
| 966 | { |
| 967 | const char *f = strrchr (s->filename, '/'); |
| 968 | if (f != NULL |
| 969 | && filename_cmp (f + 1, global_needed->name) == 0) |
| 970 | { |
| 971 | global_found = s; |
| 972 | return; |
| 973 | } |
| 974 | } |
| 975 | |
| 976 | soname = bfd_elf_get_dt_soname (s->the_bfd); |
| 977 | if (soname != NULL |
| 978 | && filename_cmp (soname, global_needed->name) == 0) |
| 979 | { |
| 980 | global_found = s; |
| 981 | return; |
| 982 | } |
| 983 | } |
| 984 | |
| 985 | /* This is called after all the input files have been opened. */ |
| 986 | |
| 987 | void |
| 988 | ldelf_after_open (int use_libpath, int native, int is_linux, int is_freebsd, |
| 989 | int elfsize) |
| 990 | { |
| 991 | struct bfd_link_needed_list *needed, *l; |
| 992 | struct elf_link_hash_table *htab; |
| 993 | asection *s; |
| 994 | bfd *abfd; |
| 995 | |
| 996 | after_open_default (); |
| 997 | |
| 998 | htab = elf_hash_table (&link_info); |
| 999 | if (!is_elf_hash_table (htab)) |
| 1000 | return; |
| 1001 | |
| 1002 | if (command_line.out_implib_filename) |
| 1003 | { |
| 1004 | unlink_if_ordinary (command_line.out_implib_filename); |
| 1005 | link_info.out_implib_bfd |
| 1006 | = bfd_openw (command_line.out_implib_filename, |
| 1007 | bfd_get_target (link_info.output_bfd)); |
| 1008 | |
| 1009 | if (link_info.out_implib_bfd == NULL) |
| 1010 | { |
| 1011 | einfo (_("%F%P: %s: can't open for writing: %E\n"), |
| 1012 | command_line.out_implib_filename); |
| 1013 | } |
| 1014 | } |
| 1015 | |
| 1016 | if (ldelf_emit_note_gnu_build_id != NULL) |
| 1017 | { |
| 1018 | /* Find an ELF input. */ |
| 1019 | for (abfd = link_info.input_bfds; |
| 1020 | abfd != (bfd *) NULL; abfd = abfd->link.next) |
| 1021 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour |
| 1022 | && bfd_count_sections (abfd) != 0 |
| 1023 | && !bfd_input_just_syms (abfd)) |
| 1024 | break; |
| 1025 | |
| 1026 | /* PR 10555: If there are no ELF input files do not try to |
| 1027 | create a .note.gnu-build-id section. */ |
| 1028 | if (abfd == NULL |
| 1029 | || !ldelf_setup_build_id (abfd)) |
| 1030 | { |
| 1031 | free ((char *) ldelf_emit_note_gnu_build_id); |
| 1032 | ldelf_emit_note_gnu_build_id = NULL; |
| 1033 | } |
| 1034 | } |
| 1035 | |
| 1036 | get_elf_backend_data (link_info.output_bfd)->setup_gnu_properties (&link_info); |
| 1037 | |
| 1038 | if (bfd_link_relocatable (&link_info)) |
| 1039 | { |
| 1040 | if (link_info.execstack == !link_info.noexecstack) |
| 1041 | { |
| 1042 | /* PR ld/16744: If "-z [no]execstack" has been specified on the |
| 1043 | command line and we are perfoming a relocatable link then no |
| 1044 | PT_GNU_STACK segment will be created and so the |
| 1045 | linkinfo.[no]execstack values set in _handle_option() will have no |
| 1046 | effect. Instead we create a .note.GNU-stack section in much the |
| 1047 | same way as the assembler does with its --[no]execstack option. */ |
| 1048 | flagword flags = SEC_READONLY | (link_info.execstack ? SEC_CODE : 0); |
| 1049 | (void) bfd_make_section_with_flags (link_info.input_bfds, |
| 1050 | ".note.GNU-stack", flags); |
| 1051 | } |
| 1052 | return; |
| 1053 | } |
| 1054 | |
| 1055 | if (!link_info.traditional_format) |
| 1056 | { |
| 1057 | bfd *elfbfd = NULL; |
| 1058 | bfd_boolean warn_eh_frame = FALSE; |
| 1059 | int seen_type = 0; |
| 1060 | |
| 1061 | for (abfd = link_info.input_bfds; abfd; abfd = abfd->link.next) |
| 1062 | { |
| 1063 | int type = 0; |
| 1064 | |
| 1065 | if (bfd_input_just_syms (abfd)) |
| 1066 | continue; |
| 1067 | |
| 1068 | for (s = abfd->sections; s && type < COMPACT_EH_HDR; s = s->next) |
| 1069 | { |
| 1070 | const char *name = bfd_section_name (s); |
| 1071 | |
| 1072 | if (bfd_is_abs_section (s->output_section)) |
| 1073 | continue; |
| 1074 | if (CONST_STRNEQ (name, ".eh_frame_entry")) |
| 1075 | type = COMPACT_EH_HDR; |
| 1076 | else if (strcmp (name, ".eh_frame") == 0 && s->size > 8) |
| 1077 | type = DWARF2_EH_HDR; |
| 1078 | } |
| 1079 | |
| 1080 | if (type != 0) |
| 1081 | { |
| 1082 | if (seen_type == 0) |
| 1083 | { |
| 1084 | seen_type = type; |
| 1085 | } |
| 1086 | else if (seen_type != type) |
| 1087 | { |
| 1088 | einfo (_("%F%P: compact frame descriptions incompatible with" |
| 1089 | " DWARF2 .eh_frame from %pB\n"), |
| 1090 | type == DWARF2_EH_HDR ? abfd : elfbfd); |
| 1091 | break; |
| 1092 | } |
| 1093 | |
| 1094 | if (!elfbfd |
| 1095 | && (type == COMPACT_EH_HDR |
| 1096 | || link_info.eh_frame_hdr_type != 0)) |
| 1097 | { |
| 1098 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour) |
| 1099 | elfbfd = abfd; |
| 1100 | |
| 1101 | warn_eh_frame = TRUE; |
| 1102 | } |
| 1103 | } |
| 1104 | |
| 1105 | if (seen_type == COMPACT_EH_HDR) |
| 1106 | link_info.eh_frame_hdr_type = COMPACT_EH_HDR; |
| 1107 | } |
| 1108 | if (elfbfd) |
| 1109 | { |
| 1110 | const struct elf_backend_data *bed; |
| 1111 | |
| 1112 | bed = get_elf_backend_data (elfbfd); |
| 1113 | s = bfd_make_section_with_flags (elfbfd, ".eh_frame_hdr", |
| 1114 | bed->dynamic_sec_flags |
| 1115 | | SEC_READONLY); |
| 1116 | if (s != NULL |
| 1117 | && bfd_set_section_alignment (s, 2)) |
| 1118 | { |
| 1119 | htab->eh_info.hdr_sec = s; |
| 1120 | warn_eh_frame = FALSE; |
| 1121 | } |
| 1122 | } |
| 1123 | if (warn_eh_frame) |
| 1124 | einfo (_("%P: warning: cannot create .eh_frame_hdr section," |
| 1125 | " --eh-frame-hdr ignored\n")); |
| 1126 | } |
| 1127 | |
| 1128 | /* Get the list of files which appear in DT_NEEDED entries in |
| 1129 | dynamic objects included in the link (often there will be none). |
| 1130 | For each such file, we want to track down the corresponding |
| 1131 | library, and include the symbol table in the link. This is what |
| 1132 | the runtime dynamic linker will do. Tracking the files down here |
| 1133 | permits one dynamic object to include another without requiring |
| 1134 | special action by the person doing the link. Note that the |
| 1135 | needed list can actually grow while we are stepping through this |
| 1136 | loop. */ |
| 1137 | needed = bfd_elf_get_needed_list (link_info.output_bfd, &link_info); |
| 1138 | for (l = needed; l != NULL; l = l->next) |
| 1139 | { |
| 1140 | struct bfd_link_needed_list *ll; |
| 1141 | struct dt_needed n, nn; |
| 1142 | int force; |
| 1143 | |
| 1144 | /* If the lib that needs this one was --as-needed and wasn't |
| 1145 | found to be needed, then this lib isn't needed either. */ |
| 1146 | if (l->by != NULL |
| 1147 | && (bfd_elf_get_dyn_lib_class (l->by) & DYN_AS_NEEDED) != 0) |
| 1148 | continue; |
| 1149 | |
| 1150 | /* Skip the lib if --no-copy-dt-needed-entries and |
| 1151 | --allow-shlib-undefined is in effect. */ |
| 1152 | if (l->by != NULL |
| 1153 | && link_info.unresolved_syms_in_shared_libs == RM_IGNORE |
| 1154 | && (bfd_elf_get_dyn_lib_class (l->by) & DYN_NO_ADD_NEEDED) != 0) |
| 1155 | continue; |
| 1156 | |
| 1157 | /* If we've already seen this file, skip it. */ |
| 1158 | for (ll = needed; ll != l; ll = ll->next) |
| 1159 | if ((ll->by == NULL |
| 1160 | || (bfd_elf_get_dyn_lib_class (ll->by) & DYN_AS_NEEDED) == 0) |
| 1161 | && strcmp (ll->name, l->name) == 0) |
| 1162 | break; |
| 1163 | if (ll != l) |
| 1164 | continue; |
| 1165 | |
| 1166 | /* See if this file was included in the link explicitly. */ |
| 1167 | global_needed = l; |
| 1168 | global_found = NULL; |
| 1169 | lang_for_each_input_file (ldelf_check_needed); |
| 1170 | if (global_found != NULL |
| 1171 | && (bfd_elf_get_dyn_lib_class (global_found->the_bfd) |
| 1172 | & DYN_AS_NEEDED) == 0) |
| 1173 | continue; |
| 1174 | |
| 1175 | n.by = l->by; |
| 1176 | n.name = l->name; |
| 1177 | nn.by = l->by; |
| 1178 | if (verbose) |
| 1179 | info_msg (_("%s needed by %pB\n"), l->name, l->by); |
| 1180 | |
| 1181 | /* As-needed libs specified on the command line (or linker script) |
| 1182 | take priority over libs found in search dirs. */ |
| 1183 | if (global_found != NULL) |
| 1184 | { |
| 1185 | nn.name = global_found->filename; |
| 1186 | if (ldelf_try_needed (&nn, TRUE, is_linux)) |
| 1187 | continue; |
| 1188 | } |
| 1189 | |
| 1190 | /* We need to find this file and include the symbol table. We |
| 1191 | want to search for the file in the same way that the dynamic |
| 1192 | linker will search. That means that we want to use |
| 1193 | rpath_link, rpath, then the environment variable |
| 1194 | LD_LIBRARY_PATH (native only), then the DT_RPATH/DT_RUNPATH |
| 1195 | entries (native only), then the linker script LIB_SEARCH_DIRS. |
| 1196 | We do not search using the -L arguments. |
| 1197 | |
| 1198 | We search twice. The first time, we skip objects which may |
| 1199 | introduce version mismatches. The second time, we force |
| 1200 | their use. See ldelf_vercheck comment. */ |
| 1201 | for (force = 0; force < 2; force++) |
| 1202 | { |
| 1203 | size_t len; |
| 1204 | search_dirs_type *search; |
| 1205 | const char *path; |
| 1206 | struct bfd_link_needed_list *rp; |
| 1207 | int found; |
| 1208 | |
| 1209 | if (ldelf_search_needed (command_line.rpath_link, &n, force, |
| 1210 | is_linux, elfsize)) |
| 1211 | break; |
| 1212 | |
| 1213 | if (use_libpath) |
| 1214 | { |
| 1215 | path = command_line.rpath; |
| 1216 | if (path) |
| 1217 | { |
| 1218 | path = ldelf_add_sysroot (path); |
| 1219 | found = ldelf_search_needed (path, &n, force, |
| 1220 | is_linux, elfsize); |
| 1221 | free ((char *) path); |
| 1222 | if (found) |
| 1223 | break; |
| 1224 | } |
| 1225 | } |
| 1226 | if (native) |
| 1227 | { |
| 1228 | if (command_line.rpath_link == NULL |
| 1229 | && command_line.rpath == NULL) |
| 1230 | { |
| 1231 | path = (const char *) getenv ("LD_RUN_PATH"); |
| 1232 | if (path |
| 1233 | && ldelf_search_needed (path, &n, force, |
| 1234 | is_linux, elfsize)) |
| 1235 | break; |
| 1236 | } |
| 1237 | path = (const char *) getenv ("LD_LIBRARY_PATH"); |
| 1238 | if (path |
| 1239 | && ldelf_search_needed (path, &n, force, |
| 1240 | is_linux, elfsize)) |
| 1241 | break; |
| 1242 | } |
| 1243 | if (use_libpath) |
| 1244 | { |
| 1245 | found = 0; |
| 1246 | rp = bfd_elf_get_runpath_list (link_info.output_bfd, &link_info); |
| 1247 | for (; !found && rp != NULL; rp = rp->next) |
| 1248 | { |
| 1249 | path = ldelf_add_sysroot (rp->name); |
| 1250 | found = (rp->by == l->by |
| 1251 | && ldelf_search_needed (path, &n, force, |
| 1252 | is_linux, elfsize)); |
| 1253 | free ((char *) path); |
| 1254 | } |
| 1255 | if (found) |
| 1256 | break; |
| 1257 | |
| 1258 | if (is_freebsd |
| 1259 | && ldelf_check_ld_elf_hints (l, force, elfsize)) |
| 1260 | break; |
| 1261 | |
| 1262 | if (is_linux |
| 1263 | && ldelf_check_ld_so_conf (l, force, elfsize)) |
| 1264 | break; |
| 1265 | } |
| 1266 | |
| 1267 | len = strlen (l->name); |
| 1268 | for (search = search_head; search != NULL; search = search->next) |
| 1269 | { |
| 1270 | char *filename; |
| 1271 | |
| 1272 | if (search->cmdline) |
| 1273 | continue; |
| 1274 | filename = (char *) xmalloc (strlen (search->name) + len + 2); |
| 1275 | sprintf (filename, "%s/%s", search->name, l->name); |
| 1276 | nn.name = filename; |
| 1277 | if (ldelf_try_needed (&nn, force, is_linux)) |
| 1278 | break; |
| 1279 | free (filename); |
| 1280 | } |
| 1281 | if (search != NULL) |
| 1282 | break; |
| 1283 | } |
| 1284 | |
| 1285 | if (force < 2) |
| 1286 | continue; |
| 1287 | |
| 1288 | einfo (_("%P: warning: %s, needed by %pB, not found " |
| 1289 | "(try using -rpath or -rpath-link)\n"), |
| 1290 | l->name, l->by); |
| 1291 | } |
| 1292 | |
| 1293 | if (link_info.eh_frame_hdr_type == COMPACT_EH_HDR) |
| 1294 | if (!bfd_elf_parse_eh_frame_entries (NULL, &link_info)) |
| 1295 | einfo (_("%F%P: failed to parse EH frame entries\n")); |
| 1296 | } |
| 1297 | |
| 1298 | static bfd_size_type |
| 1299 | id_note_section_size (bfd *abfd ATTRIBUTE_UNUSED) |
| 1300 | { |
| 1301 | const char *style = ldelf_emit_note_gnu_build_id; |
| 1302 | bfd_size_type size; |
| 1303 | bfd_size_type build_id_size; |
| 1304 | |
| 1305 | size = offsetof (Elf_External_Note, name[sizeof "GNU"]); |
| 1306 | size = (size + 3) & -(bfd_size_type) 4; |
| 1307 | |
| 1308 | build_id_size = compute_build_id_size (style); |
| 1309 | if (build_id_size) |
| 1310 | size += build_id_size; |
| 1311 | else |
| 1312 | size = 0; |
| 1313 | |
| 1314 | return size; |
| 1315 | } |
| 1316 | |
| 1317 | static bfd_boolean |
| 1318 | write_build_id (bfd *abfd) |
| 1319 | { |
| 1320 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 1321 | struct elf_obj_tdata *t = elf_tdata (abfd); |
| 1322 | const char *style; |
| 1323 | asection *asec; |
| 1324 | Elf_Internal_Shdr *i_shdr; |
| 1325 | unsigned char *contents, *id_bits; |
| 1326 | bfd_size_type size; |
| 1327 | file_ptr position; |
| 1328 | Elf_External_Note *e_note; |
| 1329 | |
| 1330 | style = t->o->build_id.style; |
| 1331 | asec = t->o->build_id.sec; |
| 1332 | if (bfd_is_abs_section (asec->output_section)) |
| 1333 | { |
| 1334 | einfo (_("%P: warning: .note.gnu.build-id section discarded," |
| 1335 | " --build-id ignored\n")); |
| 1336 | return TRUE; |
| 1337 | } |
| 1338 | i_shdr = &elf_section_data (asec->output_section)->this_hdr; |
| 1339 | |
| 1340 | if (i_shdr->contents == NULL) |
| 1341 | { |
| 1342 | if (asec->contents == NULL) |
| 1343 | asec->contents = (unsigned char *) xmalloc (asec->size); |
| 1344 | contents = asec->contents; |
| 1345 | } |
| 1346 | else |
| 1347 | contents = i_shdr->contents + asec->output_offset; |
| 1348 | |
| 1349 | e_note = (Elf_External_Note *) contents; |
| 1350 | size = offsetof (Elf_External_Note, name[sizeof "GNU"]); |
| 1351 | size = (size + 3) & -(bfd_size_type) 4; |
| 1352 | id_bits = contents + size; |
| 1353 | size = asec->size - size; |
| 1354 | |
| 1355 | bfd_h_put_32 (abfd, sizeof "GNU", &e_note->namesz); |
| 1356 | bfd_h_put_32 (abfd, size, &e_note->descsz); |
| 1357 | bfd_h_put_32 (abfd, NT_GNU_BUILD_ID, &e_note->type); |
| 1358 | memcpy (e_note->name, "GNU", sizeof "GNU"); |
| 1359 | |
| 1360 | generate_build_id (abfd, style, bed->s->checksum_contents, id_bits, size); |
| 1361 | |
| 1362 | position = i_shdr->sh_offset + asec->output_offset; |
| 1363 | size = asec->size; |
| 1364 | return (bfd_seek (abfd, position, SEEK_SET) == 0 |
| 1365 | && bfd_bwrite (contents, size, abfd) == size); |
| 1366 | } |
| 1367 | |
| 1368 | /* Make .note.gnu.build-id section, and set up elf_tdata->build_id. */ |
| 1369 | |
| 1370 | bfd_boolean |
| 1371 | ldelf_setup_build_id (bfd *ibfd) |
| 1372 | { |
| 1373 | asection *s; |
| 1374 | bfd_size_type size; |
| 1375 | flagword flags; |
| 1376 | |
| 1377 | size = id_note_section_size (ibfd); |
| 1378 | if (size == 0) |
| 1379 | { |
| 1380 | einfo (_("%P: warning: unrecognized --build-id style ignored\n")); |
| 1381 | return FALSE; |
| 1382 | } |
| 1383 | |
| 1384 | flags = (SEC_ALLOC | SEC_LOAD | SEC_IN_MEMORY |
| 1385 | | SEC_LINKER_CREATED | SEC_READONLY | SEC_DATA); |
| 1386 | s = bfd_make_section_with_flags (ibfd, ".note.gnu.build-id", flags); |
| 1387 | if (s != NULL && bfd_set_section_alignment (s, 2)) |
| 1388 | { |
| 1389 | struct elf_obj_tdata *t = elf_tdata (link_info.output_bfd); |
| 1390 | t->o->build_id.after_write_object_contents = &write_build_id; |
| 1391 | t->o->build_id.style = ldelf_emit_note_gnu_build_id; |
| 1392 | t->o->build_id.sec = s; |
| 1393 | elf_section_type (s) = SHT_NOTE; |
| 1394 | s->size = size; |
| 1395 | return TRUE; |
| 1396 | } |
| 1397 | |
| 1398 | einfo (_("%P: warning: cannot create .note.gnu.build-id section," |
| 1399 | " --build-id ignored\n")); |
| 1400 | return FALSE; |
| 1401 | } |
| 1402 | |
| 1403 | /* Look through an expression for an assignment statement. */ |
| 1404 | |
| 1405 | static void |
| 1406 | ldelf_find_exp_assignment (etree_type *exp) |
| 1407 | { |
| 1408 | bfd_boolean provide = FALSE; |
| 1409 | |
| 1410 | switch (exp->type.node_class) |
| 1411 | { |
| 1412 | case etree_provide: |
| 1413 | case etree_provided: |
| 1414 | provide = TRUE; |
| 1415 | /* Fallthru */ |
| 1416 | case etree_assign: |
| 1417 | /* We call record_link_assignment even if the symbol is defined. |
| 1418 | This is because if it is defined by a dynamic object, we |
| 1419 | actually want to use the value defined by the linker script, |
| 1420 | not the value from the dynamic object (because we are setting |
| 1421 | symbols like etext). If the symbol is defined by a regular |
| 1422 | object, then, as it happens, calling record_link_assignment |
| 1423 | will do no harm. */ |
| 1424 | if (strcmp (exp->assign.dst, ".") != 0) |
| 1425 | { |
| 1426 | if (!bfd_elf_record_link_assignment (link_info.output_bfd, |
| 1427 | &link_info, |
| 1428 | exp->assign.dst, provide, |
| 1429 | exp->assign.hidden)) |
| 1430 | einfo (_("%F%P: failed to record assignment to %s: %E\n"), |
| 1431 | exp->assign.dst); |
| 1432 | } |
| 1433 | ldelf_find_exp_assignment (exp->assign.src); |
| 1434 | break; |
| 1435 | |
| 1436 | case etree_binary: |
| 1437 | ldelf_find_exp_assignment (exp->binary.lhs); |
| 1438 | ldelf_find_exp_assignment (exp->binary.rhs); |
| 1439 | break; |
| 1440 | |
| 1441 | case etree_trinary: |
| 1442 | ldelf_find_exp_assignment (exp->trinary.cond); |
| 1443 | ldelf_find_exp_assignment (exp->trinary.lhs); |
| 1444 | ldelf_find_exp_assignment (exp->trinary.rhs); |
| 1445 | break; |
| 1446 | |
| 1447 | case etree_unary: |
| 1448 | ldelf_find_exp_assignment (exp->unary.child); |
| 1449 | break; |
| 1450 | |
| 1451 | default: |
| 1452 | break; |
| 1453 | } |
| 1454 | } |
| 1455 | |
| 1456 | /* This is called by the before_allocation routine via |
| 1457 | lang_for_each_statement. It locates any assignment statements, and |
| 1458 | tells the ELF backend about them, in case they are assignments to |
| 1459 | symbols which are referred to by dynamic objects. */ |
| 1460 | |
| 1461 | static void |
| 1462 | ldelf_find_statement_assignment (lang_statement_union_type *s) |
| 1463 | { |
| 1464 | if (s->header.type == lang_assignment_statement_enum) |
| 1465 | ldelf_find_exp_assignment (s->assignment_statement.exp); |
| 1466 | } |
| 1467 | |
| 1468 | /* Used by before_allocation and handle_option. */ |
| 1469 | |
| 1470 | void |
| 1471 | ldelf_append_to_separated_string (char **to, char *op_arg) |
| 1472 | { |
| 1473 | if (*to == NULL) |
| 1474 | *to = xstrdup (op_arg); |
| 1475 | else |
| 1476 | { |
| 1477 | size_t to_len = strlen (*to); |
| 1478 | size_t op_arg_len = strlen (op_arg); |
| 1479 | char *buf; |
| 1480 | char *cp = *to; |
| 1481 | |
| 1482 | /* First see whether OPTARG is already in the path. */ |
| 1483 | do |
| 1484 | { |
| 1485 | if (strncmp (op_arg, cp, op_arg_len) == 0 |
| 1486 | && (cp[op_arg_len] == 0 |
| 1487 | || cp[op_arg_len] == config.rpath_separator)) |
| 1488 | /* We found it. */ |
| 1489 | break; |
| 1490 | |
| 1491 | /* Not yet found. */ |
| 1492 | cp = strchr (cp, config.rpath_separator); |
| 1493 | if (cp != NULL) |
| 1494 | ++cp; |
| 1495 | } |
| 1496 | while (cp != NULL); |
| 1497 | |
| 1498 | if (cp == NULL) |
| 1499 | { |
| 1500 | buf = xmalloc (to_len + op_arg_len + 2); |
| 1501 | sprintf (buf, "%s%c%s", *to, |
| 1502 | config.rpath_separator, op_arg); |
| 1503 | free (*to); |
| 1504 | *to = buf; |
| 1505 | } |
| 1506 | } |
| 1507 | } |
| 1508 | |
| 1509 | /* This is called after the sections have been attached to output |
| 1510 | sections, but before any sizes or addresses have been set. */ |
| 1511 | |
| 1512 | void |
| 1513 | ldelf_before_allocation (char *audit, char *depaudit, |
| 1514 | const char *default_interpreter_name) |
| 1515 | { |
| 1516 | const char *rpath; |
| 1517 | asection *sinterp; |
| 1518 | bfd *abfd; |
| 1519 | struct bfd_link_hash_entry *ehdr_start = NULL; |
| 1520 | unsigned char ehdr_start_save_type = 0; |
| 1521 | char ehdr_start_save_u[sizeof ehdr_start->u |
| 1522 | - sizeof ehdr_start->u.def.next] = ""; |
| 1523 | |
| 1524 | if (is_elf_hash_table (link_info.hash)) |
| 1525 | { |
| 1526 | _bfd_elf_tls_setup (link_info.output_bfd, &link_info); |
| 1527 | |
| 1528 | /* Make __ehdr_start hidden if it has been referenced, to |
| 1529 | prevent the symbol from being dynamic. */ |
| 1530 | if (!bfd_link_relocatable (&link_info)) |
| 1531 | { |
| 1532 | struct elf_link_hash_table *htab = elf_hash_table (&link_info); |
| 1533 | struct elf_link_hash_entry *h |
| 1534 | = elf_link_hash_lookup (htab, "__ehdr_start", FALSE, FALSE, TRUE); |
| 1535 | |
| 1536 | /* Only adjust the export class if the symbol was referenced |
| 1537 | and not defined, otherwise leave it alone. */ |
| 1538 | if (h != NULL |
| 1539 | && (h->root.type == bfd_link_hash_new |
| 1540 | || h->root.type == bfd_link_hash_undefined |
| 1541 | || h->root.type == bfd_link_hash_undefweak |
| 1542 | || h->root.type == bfd_link_hash_common)) |
| 1543 | { |
| 1544 | const struct elf_backend_data *bed; |
| 1545 | bed = get_elf_backend_data (link_info.output_bfd); |
| 1546 | (*bed->elf_backend_hide_symbol) (&link_info, h, TRUE); |
| 1547 | if (ELF_ST_VISIBILITY (h->other) != STV_INTERNAL) |
| 1548 | h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN; |
| 1549 | /* Don't leave the symbol undefined. Undefined hidden |
| 1550 | symbols typically won't have dynamic relocations, but |
| 1551 | we most likely will need dynamic relocations for |
| 1552 | __ehdr_start if we are building a PIE or shared |
| 1553 | library. */ |
| 1554 | ehdr_start = &h->root; |
| 1555 | ehdr_start_save_type = ehdr_start->type; |
| 1556 | memcpy (ehdr_start_save_u, |
| 1557 | (char *) &ehdr_start->u + sizeof ehdr_start->u.def.next, |
| 1558 | sizeof ehdr_start_save_u); |
| 1559 | ehdr_start->type = bfd_link_hash_defined; |
| 1560 | ehdr_start->u.def.section = bfd_abs_section_ptr; |
| 1561 | ehdr_start->u.def.value = 0; |
| 1562 | } |
| 1563 | } |
| 1564 | |
| 1565 | /* If we are going to make any variable assignments, we need to |
| 1566 | let the ELF backend know about them in case the variables are |
| 1567 | referred to by dynamic objects. */ |
| 1568 | lang_for_each_statement (ldelf_find_statement_assignment); |
| 1569 | } |
| 1570 | |
| 1571 | /* Let the ELF backend work out the sizes of any sections required |
| 1572 | by dynamic linking. */ |
| 1573 | rpath = command_line.rpath; |
| 1574 | if (rpath == NULL) |
| 1575 | rpath = (const char *) getenv ("LD_RUN_PATH"); |
| 1576 | |
| 1577 | for (abfd = link_info.input_bfds; abfd; abfd = abfd->link.next) |
| 1578 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour) |
| 1579 | { |
| 1580 | const char *audit_libs = elf_dt_audit (abfd); |
| 1581 | |
| 1582 | /* If the input bfd contains an audit entry, we need to add it as |
| 1583 | a dep audit entry. */ |
| 1584 | if (audit_libs && *audit_libs != '\0') |
| 1585 | { |
| 1586 | char *cp = xstrdup (audit_libs); |
| 1587 | do |
| 1588 | { |
| 1589 | int more = 0; |
| 1590 | char *cp2 = strchr (cp, config.rpath_separator); |
| 1591 | |
| 1592 | if (cp2) |
| 1593 | { |
| 1594 | *cp2 = '\0'; |
| 1595 | more = 1; |
| 1596 | } |
| 1597 | |
| 1598 | if (cp != NULL && *cp != '\0') |
| 1599 | ldelf_append_to_separated_string (&depaudit, cp); |
| 1600 | |
| 1601 | cp = more ? ++cp2 : NULL; |
| 1602 | } |
| 1603 | while (cp != NULL); |
| 1604 | } |
| 1605 | } |
| 1606 | |
| 1607 | if (! (bfd_elf_size_dynamic_sections |
| 1608 | (link_info.output_bfd, command_line.soname, rpath, |
| 1609 | command_line.filter_shlib, audit, depaudit, |
| 1610 | (const char * const *) command_line.auxiliary_filters, |
| 1611 | &link_info, &sinterp))) |
| 1612 | einfo (_("%F%P: failed to set dynamic section sizes: %E\n")); |
| 1613 | |
| 1614 | if (sinterp != NULL) |
| 1615 | { |
| 1616 | /* Let the user override the dynamic linker we are using. */ |
| 1617 | if (command_line.interpreter != NULL) |
| 1618 | default_interpreter_name = command_line.interpreter; |
| 1619 | if (default_interpreter_name != NULL) |
| 1620 | { |
| 1621 | sinterp->contents = (bfd_byte *) default_interpreter_name; |
| 1622 | sinterp->size = strlen ((char *) sinterp->contents) + 1; |
| 1623 | } |
| 1624 | } |
| 1625 | |
| 1626 | /* Look for any sections named .gnu.warning. As a GNU extensions, |
| 1627 | we treat such sections as containing warning messages. We print |
| 1628 | out the warning message, and then zero out the section size so |
| 1629 | that it does not get copied into the output file. */ |
| 1630 | |
| 1631 | { |
| 1632 | LANG_FOR_EACH_INPUT_STATEMENT (is) |
| 1633 | { |
| 1634 | asection *s; |
| 1635 | bfd_size_type sz; |
| 1636 | char *msg; |
| 1637 | |
| 1638 | if (is->flags.just_syms) |
| 1639 | continue; |
| 1640 | |
| 1641 | s = bfd_get_section_by_name (is->the_bfd, ".gnu.warning"); |
| 1642 | if (s == NULL) |
| 1643 | continue; |
| 1644 | |
| 1645 | sz = s->size; |
| 1646 | msg = (char *) xmalloc ((size_t) (sz + 1)); |
| 1647 | if (! bfd_get_section_contents (is->the_bfd, s, msg, |
| 1648 | (file_ptr) 0, sz)) |
| 1649 | einfo (_("%F%P: %pB: can't read contents of section .gnu.warning: %E\n"), |
| 1650 | is->the_bfd); |
| 1651 | msg[sz] = '\0'; |
| 1652 | (*link_info.callbacks->warning) (&link_info, msg, |
| 1653 | (const char *) NULL, is->the_bfd, |
| 1654 | (asection *) NULL, (bfd_vma) 0); |
| 1655 | free (msg); |
| 1656 | |
| 1657 | /* Clobber the section size, so that we don't waste space |
| 1658 | copying the warning into the output file. If we've already |
| 1659 | sized the output section, adjust its size. The adjustment |
| 1660 | is on rawsize because targets that size sections early will |
| 1661 | have called lang_reset_memory_regions after sizing. */ |
| 1662 | if (s->output_section != NULL |
| 1663 | && s->output_section->rawsize >= s->size) |
| 1664 | s->output_section->rawsize -= s->size; |
| 1665 | |
| 1666 | s->size = 0; |
| 1667 | |
| 1668 | /* Also set SEC_EXCLUDE, so that local symbols defined in the |
| 1669 | warning section don't get copied to the output. */ |
| 1670 | s->flags |= SEC_EXCLUDE | SEC_KEEP; |
| 1671 | } |
| 1672 | } |
| 1673 | |
| 1674 | before_allocation_default (); |
| 1675 | |
| 1676 | if (!bfd_elf_size_dynsym_hash_dynstr (link_info.output_bfd, &link_info)) |
| 1677 | einfo (_("%F%P: failed to set dynamic section sizes: %E\n")); |
| 1678 | |
| 1679 | if (ehdr_start != NULL) |
| 1680 | { |
| 1681 | /* If we twiddled __ehdr_start to defined earlier, put it back |
| 1682 | as it was. */ |
| 1683 | ehdr_start->type = ehdr_start_save_type; |
| 1684 | memcpy ((char *) &ehdr_start->u + sizeof ehdr_start->u.def.next, |
| 1685 | ehdr_start_save_u, |
| 1686 | sizeof ehdr_start_save_u); |
| 1687 | } |
| 1688 | } |
| 1689 | /* Try to open a dynamic archive. This is where we know that ELF |
| 1690 | dynamic libraries have an extension of .so (or .sl on oddball systems |
| 1691 | like hpux). */ |
| 1692 | |
| 1693 | bfd_boolean |
| 1694 | ldelf_open_dynamic_archive (const char *arch, search_dirs_type *search, |
| 1695 | lang_input_statement_type *entry) |
| 1696 | { |
| 1697 | const char *filename; |
| 1698 | char *string; |
| 1699 | size_t len; |
| 1700 | bfd_boolean opened = FALSE; |
| 1701 | |
| 1702 | if (! entry->flags.maybe_archive) |
| 1703 | return FALSE; |
| 1704 | |
| 1705 | filename = entry->filename; |
| 1706 | len = strlen (search->name) + strlen (filename); |
| 1707 | if (entry->flags.full_name_provided) |
| 1708 | { |
| 1709 | len += sizeof "/"; |
| 1710 | string = (char *) xmalloc (len); |
| 1711 | sprintf (string, "%s/%s", search->name, filename); |
| 1712 | } |
| 1713 | else |
| 1714 | { |
| 1715 | size_t xlen = 0; |
| 1716 | |
| 1717 | len += strlen (arch) + sizeof "/lib.so"; |
| 1718 | #ifdef EXTRA_SHLIB_EXTENSION |
| 1719 | xlen = (strlen (EXTRA_SHLIB_EXTENSION) > 3 |
| 1720 | ? strlen (EXTRA_SHLIB_EXTENSION) - 3 |
| 1721 | : 0); |
| 1722 | #endif |
| 1723 | string = (char *) xmalloc (len + xlen); |
| 1724 | sprintf (string, "%s/lib%s%s.so", search->name, filename, arch); |
| 1725 | #ifdef EXTRA_SHLIB_EXTENSION |
| 1726 | /* Try the .so extension first. If that fails build a new filename |
| 1727 | using EXTRA_SHLIB_EXTENSION. */ |
| 1728 | opened = ldfile_try_open_bfd (string, entry); |
| 1729 | if (!opened) |
| 1730 | strcpy (string + len - 4, EXTRA_SHLIB_EXTENSION); |
| 1731 | #endif |
| 1732 | } |
| 1733 | |
| 1734 | if (!opened && !ldfile_try_open_bfd (string, entry)) |
| 1735 | { |
| 1736 | free (string); |
| 1737 | return FALSE; |
| 1738 | } |
| 1739 | |
| 1740 | entry->filename = string; |
| 1741 | |
| 1742 | /* We have found a dynamic object to include in the link. The ELF |
| 1743 | backend linker will create a DT_NEEDED entry in the .dynamic |
| 1744 | section naming this file. If this file includes a DT_SONAME |
| 1745 | entry, it will be used. Otherwise, the ELF linker will just use |
| 1746 | the name of the file. For an archive found by searching, like |
| 1747 | this one, the DT_NEEDED entry should consist of just the name of |
| 1748 | the file, without the path information used to find it. Note |
| 1749 | that we only need to do this if we have a dynamic object; an |
| 1750 | archive will never be referenced by a DT_NEEDED entry. |
| 1751 | |
| 1752 | FIXME: This approach--using bfd_elf_set_dt_needed_name--is not |
| 1753 | very pretty. I haven't been able to think of anything that is |
| 1754 | pretty, though. */ |
| 1755 | if (bfd_check_format (entry->the_bfd, bfd_object) |
| 1756 | && (entry->the_bfd->flags & DYNAMIC) != 0) |
| 1757 | { |
| 1758 | ASSERT (entry->flags.maybe_archive && entry->flags.search_dirs); |
| 1759 | |
| 1760 | /* Rather than duplicating the logic above. Just use the |
| 1761 | filename we recorded earlier. */ |
| 1762 | |
| 1763 | if (!entry->flags.full_name_provided) |
| 1764 | filename = lbasename (entry->filename); |
| 1765 | bfd_elf_set_dt_needed_name (entry->the_bfd, filename); |
| 1766 | } |
| 1767 | |
| 1768 | return TRUE; |
| 1769 | } |
| 1770 | |
| 1771 | /* A variant of lang_output_section_find used by place_orphan. */ |
| 1772 | |
| 1773 | static lang_output_section_statement_type * |
| 1774 | output_rel_find (int isdyn, int rela) |
| 1775 | { |
| 1776 | lang_output_section_statement_type *lookup; |
| 1777 | lang_output_section_statement_type *last = NULL; |
| 1778 | lang_output_section_statement_type *last_alloc = NULL; |
| 1779 | lang_output_section_statement_type *last_ro_alloc = NULL; |
| 1780 | lang_output_section_statement_type *last_rel = NULL; |
| 1781 | lang_output_section_statement_type *last_rel_alloc = NULL; |
| 1782 | |
| 1783 | for (lookup = &lang_os_list.head->output_section_statement; |
| 1784 | lookup != NULL; |
| 1785 | lookup = lookup->next) |
| 1786 | { |
| 1787 | if (lookup->constraint >= 0 |
| 1788 | && CONST_STRNEQ (lookup->name, ".rel")) |
| 1789 | { |
| 1790 | int lookrela = lookup->name[4] == 'a'; |
| 1791 | |
| 1792 | /* .rel.dyn must come before all other reloc sections, to suit |
| 1793 | GNU ld.so. */ |
| 1794 | if (isdyn) |
| 1795 | break; |
| 1796 | |
| 1797 | /* Don't place after .rel.plt as doing so results in wrong |
| 1798 | dynamic tags. */ |
| 1799 | if (strcmp (".plt", lookup->name + 4 + lookrela) == 0) |
| 1800 | break; |
| 1801 | |
| 1802 | if (rela == lookrela || last_rel == NULL) |
| 1803 | last_rel = lookup; |
| 1804 | if ((rela == lookrela || last_rel_alloc == NULL) |
| 1805 | && lookup->bfd_section != NULL |
| 1806 | && (lookup->bfd_section->flags & SEC_ALLOC) != 0) |
| 1807 | last_rel_alloc = lookup; |
| 1808 | } |
| 1809 | |
| 1810 | last = lookup; |
| 1811 | if (lookup->bfd_section != NULL |
| 1812 | && (lookup->bfd_section->flags & SEC_ALLOC) != 0) |
| 1813 | { |
| 1814 | last_alloc = lookup; |
| 1815 | if ((lookup->bfd_section->flags & SEC_READONLY) != 0) |
| 1816 | last_ro_alloc = lookup; |
| 1817 | } |
| 1818 | } |
| 1819 | |
| 1820 | if (last_rel_alloc) |
| 1821 | return last_rel_alloc; |
| 1822 | |
| 1823 | if (last_rel) |
| 1824 | return last_rel; |
| 1825 | |
| 1826 | if (last_ro_alloc) |
| 1827 | return last_ro_alloc; |
| 1828 | |
| 1829 | if (last_alloc) |
| 1830 | return last_alloc; |
| 1831 | |
| 1832 | return last; |
| 1833 | } |
| 1834 | |
| 1835 | /* Return whether IN is suitable to be part of OUT. */ |
| 1836 | |
| 1837 | static bfd_boolean |
| 1838 | elf_orphan_compatible (asection *in, asection *out) |
| 1839 | { |
| 1840 | /* Non-zero sh_info implies a section with SHF_INFO_LINK with |
| 1841 | unknown semantics for the generic linker, or a SHT_REL/SHT_RELA |
| 1842 | section where sh_info specifies a symbol table. (We won't see |
| 1843 | SHT_GROUP, SHT_SYMTAB or SHT_DYNSYM sections here.) We clearly |
| 1844 | can't merge SHT_REL/SHT_RELA using differing symbol tables, and |
| 1845 | shouldn't merge sections with differing unknown semantics. */ |
| 1846 | if (elf_section_data (out)->this_hdr.sh_info |
| 1847 | != elf_section_data (in)->this_hdr.sh_info) |
| 1848 | return FALSE; |
| 1849 | /* We can't merge with member of output section group nor merge two |
| 1850 | sections with differing SHF_EXCLUDE when doing a relocatable link. |
| 1851 | */ |
| 1852 | if (bfd_link_relocatable (&link_info) |
| 1853 | && (elf_next_in_group (out) != NULL |
| 1854 | || ((elf_section_flags (out) ^ elf_section_flags (in)) |
| 1855 | & SHF_EXCLUDE) != 0)) |
| 1856 | return FALSE; |
| 1857 | return _bfd_elf_match_sections_by_type (link_info.output_bfd, out, |
| 1858 | in->owner, in); |
| 1859 | } |
| 1860 | |
| 1861 | /* Place an orphan section. We use this to put random SHF_ALLOC |
| 1862 | sections in the right segment. */ |
| 1863 | |
| 1864 | lang_output_section_statement_type * |
| 1865 | ldelf_place_orphan (asection *s, const char *secname, int constraint) |
| 1866 | { |
| 1867 | static struct orphan_save hold[] = |
| 1868 | { |
| 1869 | { ".text", |
| 1870 | SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE, |
| 1871 | 0, 0, 0, 0 }, |
| 1872 | { ".rodata", |
| 1873 | SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_DATA, |
| 1874 | 0, 0, 0, 0 }, |
| 1875 | { ".tdata", |
| 1876 | SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_THREAD_LOCAL, |
| 1877 | 0, 0, 0, 0 }, |
| 1878 | { ".data", |
| 1879 | SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_DATA, |
| 1880 | 0, 0, 0, 0 }, |
| 1881 | { ".bss", |
| 1882 | SEC_ALLOC, |
| 1883 | 0, 0, 0, 0 }, |
| 1884 | { 0, |
| 1885 | SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_DATA, |
| 1886 | 0, 0, 0, 0 }, |
| 1887 | { ".interp", |
| 1888 | SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_DATA, |
| 1889 | 0, 0, 0, 0 }, |
| 1890 | { ".sdata", |
| 1891 | SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_SMALL_DATA, |
| 1892 | 0, 0, 0, 0 }, |
| 1893 | { ".comment", |
| 1894 | SEC_HAS_CONTENTS, |
| 1895 | 0, 0, 0, 0 }, |
| 1896 | }; |
| 1897 | enum orphan_save_index |
| 1898 | { |
| 1899 | orphan_text = 0, |
| 1900 | orphan_rodata, |
| 1901 | orphan_tdata, |
| 1902 | orphan_data, |
| 1903 | orphan_bss, |
| 1904 | orphan_rel, |
| 1905 | orphan_interp, |
| 1906 | orphan_sdata, |
| 1907 | orphan_nonalloc |
| 1908 | }; |
| 1909 | static int orphan_init_done = 0; |
| 1910 | struct orphan_save *place; |
| 1911 | lang_output_section_statement_type *after; |
| 1912 | lang_output_section_statement_type *os; |
| 1913 | lang_output_section_statement_type *match_by_name = NULL; |
| 1914 | int isdyn = 0; |
| 1915 | int elfinput = s->owner->xvec->flavour == bfd_target_elf_flavour; |
| 1916 | int elfoutput = link_info.output_bfd->xvec->flavour == bfd_target_elf_flavour; |
| 1917 | unsigned int sh_type = elfinput ? elf_section_type (s) : SHT_NULL; |
| 1918 | flagword flags; |
| 1919 | asection *nexts; |
| 1920 | |
| 1921 | if (!bfd_link_relocatable (&link_info) |
| 1922 | && link_info.combreloc |
| 1923 | && (s->flags & SEC_ALLOC)) |
| 1924 | { |
| 1925 | if (elfinput) |
| 1926 | switch (sh_type) |
| 1927 | { |
| 1928 | case SHT_RELA: |
| 1929 | secname = ".rela.dyn"; |
| 1930 | isdyn = 1; |
| 1931 | break; |
| 1932 | case SHT_REL: |
| 1933 | secname = ".rel.dyn"; |
| 1934 | isdyn = 1; |
| 1935 | break; |
| 1936 | default: |
| 1937 | break; |
| 1938 | } |
| 1939 | else if (CONST_STRNEQ (secname, ".rel")) |
| 1940 | { |
| 1941 | secname = secname[4] == 'a' ? ".rela.dyn" : ".rel.dyn"; |
| 1942 | isdyn = 1; |
| 1943 | } |
| 1944 | } |
| 1945 | |
| 1946 | if (!bfd_link_relocatable (&link_info) |
| 1947 | && elfinput |
| 1948 | && elfoutput |
| 1949 | && (s->flags & SEC_ALLOC) != 0 |
| 1950 | && (elf_tdata (s->owner)->has_gnu_osabi & elf_gnu_osabi_mbind) != 0 |
| 1951 | && (elf_section_flags (s) & SHF_GNU_MBIND) != 0) |
| 1952 | { |
| 1953 | /* Find the output mbind section with the same type, attributes |
| 1954 | and sh_info field. */ |
| 1955 | for (os = &lang_os_list.head->output_section_statement; |
| 1956 | os != NULL; |
| 1957 | os = os->next) |
| 1958 | if (os->bfd_section != NULL |
| 1959 | && !bfd_is_abs_section (os->bfd_section) |
| 1960 | && (elf_section_flags (os->bfd_section) & SHF_GNU_MBIND) != 0 |
| 1961 | && ((s->flags & (SEC_ALLOC |
| 1962 | | SEC_LOAD |
| 1963 | | SEC_HAS_CONTENTS |
| 1964 | | SEC_READONLY |
| 1965 | | SEC_CODE)) |
| 1966 | == (os->bfd_section->flags & (SEC_ALLOC |
| 1967 | | SEC_LOAD |
| 1968 | | SEC_HAS_CONTENTS |
| 1969 | | SEC_READONLY |
| 1970 | | SEC_CODE))) |
| 1971 | && (elf_section_data (os->bfd_section)->this_hdr.sh_info |
| 1972 | == elf_section_data (s)->this_hdr.sh_info)) |
| 1973 | { |
| 1974 | lang_add_section (&os->children, s, NULL, os); |
| 1975 | return os; |
| 1976 | } |
| 1977 | |
| 1978 | /* Create the output mbind section with the ".mbind." prefix |
| 1979 | in section name. */ |
| 1980 | if ((s->flags & (SEC_LOAD | SEC_HAS_CONTENTS)) == 0) |
| 1981 | secname = ".mbind.bss"; |
| 1982 | else if ((s->flags & SEC_READONLY) == 0) |
| 1983 | secname = ".mbind.data"; |
| 1984 | else if ((s->flags & SEC_CODE) == 0) |
| 1985 | secname = ".mbind.rodata"; |
| 1986 | else |
| 1987 | secname = ".mbind.text"; |
| 1988 | elf_tdata (link_info.output_bfd)->has_gnu_osabi |= elf_gnu_osabi_mbind; |
| 1989 | } |
| 1990 | |
| 1991 | /* Look through the script to see where to place this section. The |
| 1992 | script includes entries added by previous lang_insert_orphan |
| 1993 | calls, so this loop puts multiple compatible orphans of the same |
| 1994 | name into a single output section. */ |
| 1995 | if (constraint == 0) |
| 1996 | for (os = lang_output_section_find (secname); |
| 1997 | os != NULL; |
| 1998 | os = next_matching_output_section_statement (os, 0)) |
| 1999 | { |
| 2000 | /* If we don't match an existing output section, tell |
| 2001 | lang_insert_orphan to create a new output section. */ |
| 2002 | constraint = SPECIAL; |
| 2003 | |
| 2004 | /* Check to see if we already have an output section statement |
| 2005 | with this name, and its bfd section has compatible flags. |
| 2006 | If the section already exists but does not have any flags |
| 2007 | set, then it has been created by the linker, possibly as a |
| 2008 | result of a --section-start command line switch. */ |
| 2009 | if (os->bfd_section != NULL |
| 2010 | && (os->bfd_section->flags == 0 |
| 2011 | || (((s->flags ^ os->bfd_section->flags) |
| 2012 | & (SEC_LOAD | SEC_ALLOC)) == 0 |
| 2013 | && (!elfinput |
| 2014 | || !elfoutput |
| 2015 | || elf_orphan_compatible (s, os->bfd_section))))) |
| 2016 | { |
| 2017 | lang_add_section (&os->children, s, NULL, os); |
| 2018 | return os; |
| 2019 | } |
| 2020 | |
| 2021 | /* Save unused output sections in case we can match them |
| 2022 | against orphans later. */ |
| 2023 | if (os->bfd_section == NULL) |
| 2024 | match_by_name = os; |
| 2025 | } |
| 2026 | |
| 2027 | /* If we didn't match an active output section, see if we matched an |
| 2028 | unused one and use that. */ |
| 2029 | if (match_by_name) |
| 2030 | { |
| 2031 | lang_add_section (&match_by_name->children, s, NULL, match_by_name); |
| 2032 | return match_by_name; |
| 2033 | } |
| 2034 | |
| 2035 | if (!orphan_init_done) |
| 2036 | { |
| 2037 | struct orphan_save *ho; |
| 2038 | |
| 2039 | for (ho = hold; ho < hold + sizeof (hold) / sizeof (hold[0]); ++ho) |
| 2040 | if (ho->name != NULL) |
| 2041 | { |
| 2042 | ho->os = lang_output_section_find (ho->name); |
| 2043 | if (ho->os != NULL && ho->os->flags == 0) |
| 2044 | ho->os->flags = ho->flags; |
| 2045 | } |
| 2046 | orphan_init_done = 1; |
| 2047 | } |
| 2048 | |
| 2049 | /* If this is a final link, then always put .gnu.warning.SYMBOL |
| 2050 | sections into the .text section to get them out of the way. */ |
| 2051 | if (bfd_link_executable (&link_info) |
| 2052 | && CONST_STRNEQ (s->name, ".gnu.warning.") |
| 2053 | && hold[orphan_text].os != NULL) |
| 2054 | { |
| 2055 | os = hold[orphan_text].os; |
| 2056 | lang_add_section (&os->children, s, NULL, os); |
| 2057 | return os; |
| 2058 | } |
| 2059 | |
| 2060 | flags = s->flags; |
| 2061 | if (!bfd_link_relocatable (&link_info)) |
| 2062 | { |
| 2063 | nexts = s; |
| 2064 | while ((nexts = bfd_get_next_section_by_name (nexts->owner, nexts)) |
| 2065 | != NULL) |
| 2066 | if (nexts->output_section == NULL |
| 2067 | && (nexts->flags & SEC_EXCLUDE) == 0 |
| 2068 | && ((nexts->flags ^ flags) & (SEC_LOAD | SEC_ALLOC)) == 0 |
| 2069 | && (nexts->owner->flags & DYNAMIC) == 0 |
| 2070 | && !bfd_input_just_syms (nexts->owner) |
| 2071 | && _bfd_elf_match_sections_by_type (nexts->owner, nexts, |
| 2072 | s->owner, s)) |
| 2073 | flags = (((flags ^ SEC_READONLY) |
| 2074 | | (nexts->flags ^ SEC_READONLY)) |
| 2075 | ^ SEC_READONLY); |
| 2076 | } |
| 2077 | |
| 2078 | /* Decide which segment the section should go in based on the |
| 2079 | section name and section flags. We put loadable .note sections |
| 2080 | right after the .interp section, so that the PT_NOTE segment is |
| 2081 | stored right after the program headers where the OS can read it |
| 2082 | in the first page. */ |
| 2083 | |
| 2084 | place = NULL; |
| 2085 | if ((flags & (SEC_ALLOC | SEC_DEBUGGING)) == 0) |
| 2086 | place = &hold[orphan_nonalloc]; |
| 2087 | else if ((flags & SEC_ALLOC) == 0) |
| 2088 | ; |
| 2089 | else if ((flags & SEC_LOAD) != 0 |
| 2090 | && (elfinput |
| 2091 | ? sh_type == SHT_NOTE |
| 2092 | : CONST_STRNEQ (secname, ".note"))) |
| 2093 | place = &hold[orphan_interp]; |
| 2094 | else if ((flags & (SEC_LOAD | SEC_HAS_CONTENTS | SEC_THREAD_LOCAL)) == 0) |
| 2095 | place = &hold[orphan_bss]; |
| 2096 | else if ((flags & SEC_SMALL_DATA) != 0) |
| 2097 | place = &hold[orphan_sdata]; |
| 2098 | else if ((flags & SEC_THREAD_LOCAL) != 0) |
| 2099 | place = &hold[orphan_tdata]; |
| 2100 | else if ((flags & SEC_READONLY) == 0) |
| 2101 | place = &hold[orphan_data]; |
| 2102 | else if ((flags & SEC_LOAD) != 0 |
| 2103 | && (elfinput |
| 2104 | ? sh_type == SHT_RELA || sh_type == SHT_REL |
| 2105 | : CONST_STRNEQ (secname, ".rel"))) |
| 2106 | place = &hold[orphan_rel]; |
| 2107 | else if ((flags & SEC_CODE) == 0) |
| 2108 | place = &hold[orphan_rodata]; |
| 2109 | else |
| 2110 | place = &hold[orphan_text]; |
| 2111 | |
| 2112 | after = NULL; |
| 2113 | if (place != NULL) |
| 2114 | { |
| 2115 | if (place->os == NULL) |
| 2116 | { |
| 2117 | if (place->name != NULL) |
| 2118 | place->os = lang_output_section_find (place->name); |
| 2119 | else |
| 2120 | { |
| 2121 | int rela = elfinput ? sh_type == SHT_RELA : secname[4] == 'a'; |
| 2122 | place->os = output_rel_find (isdyn, rela); |
| 2123 | } |
| 2124 | } |
| 2125 | after = place->os; |
| 2126 | if (after == NULL) |
| 2127 | after |
| 2128 | = lang_output_section_find_by_flags (s, flags, &place->os, |
| 2129 | _bfd_elf_match_sections_by_type); |
| 2130 | if (after == NULL) |
| 2131 | /* *ABS* is always the first output section statement. */ |
| 2132 | after = &lang_os_list.head->output_section_statement; |
| 2133 | } |
| 2134 | |
| 2135 | return lang_insert_orphan (s, secname, constraint, after, place, NULL, NULL); |
| 2136 | } |