| 1 | # This shell script emits a C file. -*- C -*- |
| 2 | # It does some substitutions. |
| 3 | # This file is now misnamed, because it supports both 32 bit and 64 bit |
| 4 | # ELF emulations. |
| 5 | test -z "${ELFSIZE}" && ELFSIZE=32 |
| 6 | cat >e${EMULATION_NAME}.c <<EOF |
| 7 | /* This file is is generated by a shell script. DO NOT EDIT! */ |
| 8 | |
| 9 | /* ${ELFSIZE} bit ELF emulation code for ${EMULATION_NAME} |
| 10 | Copyright (C) 1991, 93, 94, 95, 1996 Free Software Foundation, Inc. |
| 11 | Written by Steve Chamberlain <sac@cygnus.com> |
| 12 | ELF support by Ian Lance Taylor <ian@cygnus.com> |
| 13 | |
| 14 | This file is part of GLD, the Gnu Linker. |
| 15 | |
| 16 | This program is free software; you can redistribute it and/or modify |
| 17 | it under the terms of the GNU General Public License as published by |
| 18 | the Free Software Foundation; either version 2 of the License, or |
| 19 | (at your option) any later version. |
| 20 | |
| 21 | This program is distributed in the hope that it will be useful, |
| 22 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 23 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 24 | GNU General Public License for more details. |
| 25 | |
| 26 | You should have received a copy of the GNU General Public License |
| 27 | along with this program; if not, write to the Free Software |
| 28 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 29 | |
| 30 | #define TARGET_IS_${EMULATION_NAME} |
| 31 | |
| 32 | #include "bfd.h" |
| 33 | #include "sysdep.h" |
| 34 | |
| 35 | #include <ctype.h> |
| 36 | |
| 37 | #include "bfdlink.h" |
| 38 | |
| 39 | #include "ld.h" |
| 40 | #include "ldmain.h" |
| 41 | #include "ldemul.h" |
| 42 | #include "ldfile.h" |
| 43 | #include "ldmisc.h" |
| 44 | #include "ldexp.h" |
| 45 | #include "ldlang.h" |
| 46 | #include "ldgram.h" |
| 47 | |
| 48 | static void gld${EMULATION_NAME}_before_parse PARAMS ((void)); |
| 49 | static boolean gld${EMULATION_NAME}_open_dynamic_archive |
| 50 | PARAMS ((const char *, search_dirs_type *, lang_input_statement_type *)); |
| 51 | static void gld${EMULATION_NAME}_after_open PARAMS ((void)); |
| 52 | static void gld${EMULATION_NAME}_check_needed |
| 53 | PARAMS ((lang_input_statement_type *)); |
| 54 | static void gld${EMULATION_NAME}_stat_needed |
| 55 | PARAMS ((lang_input_statement_type *)); |
| 56 | static boolean gld${EMULATION_NAME}_search_needed |
| 57 | PARAMS ((const char *, const char *)); |
| 58 | static boolean gld${EMULATION_NAME}_try_needed PARAMS ((const char *)); |
| 59 | static void gld${EMULATION_NAME}_before_allocation PARAMS ((void)); |
| 60 | static void gld${EMULATION_NAME}_find_statement_assignment |
| 61 | PARAMS ((lang_statement_union_type *)); |
| 62 | static void gld${EMULATION_NAME}_find_exp_assignment PARAMS ((etree_type *)); |
| 63 | static boolean gld${EMULATION_NAME}_place_orphan |
| 64 | PARAMS ((lang_input_statement_type *, asection *)); |
| 65 | static void gld${EMULATION_NAME}_place_section |
| 66 | PARAMS ((lang_statement_union_type *)); |
| 67 | static char *gld${EMULATION_NAME}_get_script PARAMS ((int *isfile)); |
| 68 | |
| 69 | static void |
| 70 | gld${EMULATION_NAME}_before_parse() |
| 71 | { |
| 72 | ldfile_output_architecture = bfd_arch_`echo ${ARCH} | sed -e 's/:.*//'`; |
| 73 | config.dynamic_link = ${DYNAMIC_LINK-true}; |
| 74 | } |
| 75 | |
| 76 | /* Try to open a dynamic archive. This is where we know that ELF |
| 77 | dynamic libraries have an extension of .so. */ |
| 78 | |
| 79 | static boolean |
| 80 | gld${EMULATION_NAME}_open_dynamic_archive (arch, search, entry) |
| 81 | const char *arch; |
| 82 | search_dirs_type *search; |
| 83 | lang_input_statement_type *entry; |
| 84 | { |
| 85 | const char *filename; |
| 86 | char *string; |
| 87 | |
| 88 | if (! entry->is_archive) |
| 89 | return false; |
| 90 | |
| 91 | filename = entry->filename; |
| 92 | |
| 93 | string = (char *) xmalloc (strlen (search->name) |
| 94 | + strlen (filename) |
| 95 | + strlen (arch) |
| 96 | + sizeof "/lib.so"); |
| 97 | |
| 98 | sprintf (string, "%s/lib%s%s.so", search->name, filename, arch); |
| 99 | |
| 100 | if (! ldfile_try_open_bfd (string, entry)) |
| 101 | { |
| 102 | free (string); |
| 103 | return false; |
| 104 | } |
| 105 | |
| 106 | entry->filename = string; |
| 107 | |
| 108 | /* We have found a dynamic object to include in the link. The ELF |
| 109 | backend linker will create a DT_NEEDED entry in the .dynamic |
| 110 | section naming this file. If this file includes a DT_SONAME |
| 111 | entry, it will be used. Otherwise, the ELF linker will just use |
| 112 | the name of the file. For an archive found by searching, like |
| 113 | this one, the DT_NEEDED entry should consist of just the name of |
| 114 | the file, without the path information used to find it. Note |
| 115 | that we only need to do this if we have a dynamic object; an |
| 116 | archive will never be referenced by a DT_NEEDED entry. |
| 117 | |
| 118 | FIXME: This approach--using bfd_elf_set_dt_needed_name--is not |
| 119 | very pretty. I haven't been able to think of anything that is |
| 120 | pretty, though. */ |
| 121 | if (bfd_check_format (entry->the_bfd, bfd_object) |
| 122 | && (entry->the_bfd->flags & DYNAMIC) != 0) |
| 123 | { |
| 124 | char *needed_name; |
| 125 | |
| 126 | ASSERT (entry->is_archive && entry->search_dirs_flag); |
| 127 | needed_name = (char *) xmalloc (strlen (filename) |
| 128 | + strlen (arch) |
| 129 | + sizeof "lib.so"); |
| 130 | sprintf (needed_name, "lib%s%s.so", filename, arch); |
| 131 | bfd_elf_set_dt_needed_name (entry->the_bfd, needed_name); |
| 132 | } |
| 133 | |
| 134 | return true; |
| 135 | } |
| 136 | |
| 137 | EOF |
| 138 | if [ "x${host}" = "x${target}" ] ; then |
| 139 | if [ "x${DEFAULT_EMULATION}" = "x${EMULATION_NAME}" ] ; then |
| 140 | cat >>e${EMULATION_NAME}.c <<EOF |
| 141 | |
| 142 | /* For a native linker, check the file /etc/ld.so.conf for directories |
| 143 | in which we may find shared libraries. /etc/ld.so.conf is really |
| 144 | only meaningful on Linux, but we check it on other systems anyhow. */ |
| 145 | |
| 146 | static boolean gld${EMULATION_NAME}_check_ld_so_conf PARAMS ((const char *)); |
| 147 | |
| 148 | static boolean |
| 149 | gld${EMULATION_NAME}_check_ld_so_conf (name) |
| 150 | const char *name; |
| 151 | { |
| 152 | static boolean initialized; |
| 153 | static char *ld_so_conf; |
| 154 | |
| 155 | if (! initialized) |
| 156 | { |
| 157 | FILE *f; |
| 158 | |
| 159 | f = fopen ("/etc/ld.so.conf", FOPEN_RT); |
| 160 | if (f != NULL) |
| 161 | { |
| 162 | char *b; |
| 163 | size_t len, alloc; |
| 164 | int c; |
| 165 | |
| 166 | len = 0; |
| 167 | alloc = 100; |
| 168 | b = (char *) xmalloc (alloc); |
| 169 | |
| 170 | while ((c = getc (f)) != EOF) |
| 171 | { |
| 172 | if (len + 1 >= alloc) |
| 173 | { |
| 174 | alloc *= 2; |
| 175 | b = (char *) xrealloc (b, alloc); |
| 176 | } |
| 177 | if (c != ':' |
| 178 | && c != ' ' |
| 179 | && c != '\t' |
| 180 | && c != '\n' |
| 181 | && c != ',') |
| 182 | { |
| 183 | b[len] = c; |
| 184 | ++len; |
| 185 | } |
| 186 | else |
| 187 | { |
| 188 | if (len > 0 && b[len - 1] != ':') |
| 189 | { |
| 190 | b[len] = ':'; |
| 191 | ++len; |
| 192 | } |
| 193 | } |
| 194 | } |
| 195 | |
| 196 | if (len > 0 && b[len - 1] == ':') |
| 197 | --len; |
| 198 | |
| 199 | if (len > 0) |
| 200 | b[len] = '\0'; |
| 201 | else |
| 202 | { |
| 203 | free (b); |
| 204 | b = NULL; |
| 205 | } |
| 206 | |
| 207 | fclose (f); |
| 208 | |
| 209 | ld_so_conf = b; |
| 210 | } |
| 211 | |
| 212 | initialized = true; |
| 213 | } |
| 214 | |
| 215 | if (ld_so_conf == NULL) |
| 216 | return false; |
| 217 | |
| 218 | return gld${EMULATION_NAME}_search_needed (ld_so_conf, name); |
| 219 | } |
| 220 | |
| 221 | EOF |
| 222 | fi |
| 223 | fi |
| 224 | cat >>e${EMULATION_NAME}.c <<EOF |
| 225 | |
| 226 | /* These variables are required to pass information back and forth |
| 227 | between after_open and check_needed and stat_needed. */ |
| 228 | |
| 229 | static struct bfd_link_needed_list *global_needed; |
| 230 | static struct stat global_stat; |
| 231 | static boolean global_found; |
| 232 | |
| 233 | /* This is called after all the input files have been opened. */ |
| 234 | |
| 235 | static void |
| 236 | gld${EMULATION_NAME}_after_open () |
| 237 | { |
| 238 | struct bfd_link_needed_list *needed, *l; |
| 239 | |
| 240 | /* We only need to worry about this when doing a final link. */ |
| 241 | if (link_info.relocateable || link_info.shared) |
| 242 | return; |
| 243 | |
| 244 | /* Get the list of files which appear in DT_NEEDED entries in |
| 245 | dynamic objects included in the link (often there will be none). |
| 246 | For each such file, we want to track down the corresponding |
| 247 | library, and include the symbol table in the link. This is what |
| 248 | the runtime dynamic linker will do. Tracking the files down here |
| 249 | permits one dynamic object to include another without requiring |
| 250 | special action by the person doing the link. Note that the |
| 251 | needed list can actually grow while we are stepping through this |
| 252 | loop. */ |
| 253 | needed = bfd_elf_get_needed_list (output_bfd, &link_info); |
| 254 | for (l = needed; l != NULL; l = l->next) |
| 255 | { |
| 256 | struct bfd_link_needed_list *ll; |
| 257 | const char *lib_path; |
| 258 | size_t len; |
| 259 | search_dirs_type *search; |
| 260 | |
| 261 | /* If we've already seen this file, skip it. */ |
| 262 | for (ll = needed; ll != l; ll = ll->next) |
| 263 | if (strcmp (ll->name, l->name) == 0) |
| 264 | break; |
| 265 | if (ll != l) |
| 266 | continue; |
| 267 | |
| 268 | /* See if this file was included in the link explicitly. */ |
| 269 | global_needed = l; |
| 270 | global_found = false; |
| 271 | lang_for_each_input_file (gld${EMULATION_NAME}_check_needed); |
| 272 | if (global_found) |
| 273 | continue; |
| 274 | |
| 275 | /* We need to find this file and include the symbol table. We |
| 276 | want to search for the file in the same way that the dynamic |
| 277 | linker will search. That means that we want to use |
| 278 | rpath_link, rpath, then the environment variable |
| 279 | LD_LIBRARY_PATH (native only), then the linker script |
| 280 | LIB_SEARCH_DIRS. We do not search using the -L arguments. */ |
| 281 | if (gld${EMULATION_NAME}_search_needed (command_line.rpath_link, |
| 282 | l->name)) |
| 283 | continue; |
| 284 | if (gld${EMULATION_NAME}_search_needed (command_line.rpath, l->name)) |
| 285 | continue; |
| 286 | if (command_line.rpath_link == NULL |
| 287 | && command_line.rpath == NULL) |
| 288 | { |
| 289 | lib_path = (const char *) getenv ("LD_RUN_PATH"); |
| 290 | if (gld${EMULATION_NAME}_search_needed (lib_path, l->name)) |
| 291 | continue; |
| 292 | } |
| 293 | EOF |
| 294 | if [ "x${host}" = "x${target}" ] ; then |
| 295 | if [ "x${DEFAULT_EMULATION}" = "x${EMULATION_NAME}" ] ; then |
| 296 | cat >>e${EMULATION_NAME}.c <<EOF |
| 297 | lib_path = (const char *) getenv ("LD_LIBRARY_PATH"); |
| 298 | if (gld${EMULATION_NAME}_search_needed (lib_path, l->name)) |
| 299 | continue; |
| 300 | EOF |
| 301 | fi |
| 302 | fi |
| 303 | cat >>e${EMULATION_NAME}.c <<EOF |
| 304 | len = strlen (l->name); |
| 305 | for (search = search_head; search != NULL; search = search->next) |
| 306 | { |
| 307 | char *filename; |
| 308 | |
| 309 | if (search->cmdline) |
| 310 | continue; |
| 311 | filename = (char *) xmalloc (strlen (search->name) + len + 2); |
| 312 | sprintf (filename, "%s/%s", search->name, l->name); |
| 313 | if (gld${EMULATION_NAME}_try_needed (filename)) |
| 314 | break; |
| 315 | free (filename); |
| 316 | } |
| 317 | if (search != NULL) |
| 318 | continue; |
| 319 | EOF |
| 320 | if [ "x${host}" = "x${target}" ] ; then |
| 321 | if [ "x${DEFAULT_EMULATION}" = "x${EMULATION_NAME}" ] ; then |
| 322 | cat >>e${EMULATION_NAME}.c <<EOF |
| 323 | if (gld${EMULATION_NAME}_check_ld_so_conf (l->name)) |
| 324 | continue; |
| 325 | EOF |
| 326 | fi |
| 327 | fi |
| 328 | cat >>e${EMULATION_NAME}.c <<EOF |
| 329 | |
| 330 | einfo ("%P: warning: %s, needed by %B, not found\n", |
| 331 | l->name, l->by); |
| 332 | } |
| 333 | } |
| 334 | |
| 335 | /* Search for a needed file in a path. */ |
| 336 | |
| 337 | static boolean |
| 338 | gld${EMULATION_NAME}_search_needed (path, name) |
| 339 | const char *path; |
| 340 | const char *name; |
| 341 | { |
| 342 | const char *s; |
| 343 | size_t len; |
| 344 | |
| 345 | if (path == NULL || *path == '\0') |
| 346 | return false; |
| 347 | len = strlen (name); |
| 348 | while (1) |
| 349 | { |
| 350 | char *filename, *sset; |
| 351 | |
| 352 | s = strchr (path, ':'); |
| 353 | if (s == NULL) |
| 354 | s = path + strlen (path); |
| 355 | |
| 356 | filename = (char *) xmalloc (s - path + len + 2); |
| 357 | if (s == path) |
| 358 | sset = filename; |
| 359 | else |
| 360 | { |
| 361 | memcpy (filename, path, s - path); |
| 362 | filename[s - path] = '/'; |
| 363 | sset = filename + (s - path) + 1; |
| 364 | } |
| 365 | strcpy (sset, name); |
| 366 | |
| 367 | if (gld${EMULATION_NAME}_try_needed (filename)) |
| 368 | return true; |
| 369 | |
| 370 | free (filename); |
| 371 | |
| 372 | if (*s == '\0') |
| 373 | break; |
| 374 | path = s + 1; |
| 375 | } |
| 376 | |
| 377 | return false; |
| 378 | } |
| 379 | |
| 380 | /* This function is called for each possible name for a dynamic object |
| 381 | named by a DT_NEEDED entry. */ |
| 382 | |
| 383 | static boolean |
| 384 | gld${EMULATION_NAME}_try_needed (name) |
| 385 | const char *name; |
| 386 | { |
| 387 | bfd *abfd; |
| 388 | |
| 389 | abfd = bfd_openr (name, bfd_get_target (output_bfd)); |
| 390 | if (abfd == NULL) |
| 391 | return false; |
| 392 | if (! bfd_check_format (abfd, bfd_object)) |
| 393 | { |
| 394 | (void) bfd_close (abfd); |
| 395 | return false; |
| 396 | } |
| 397 | if ((bfd_get_file_flags (abfd) & DYNAMIC) == 0) |
| 398 | { |
| 399 | (void) bfd_close (abfd); |
| 400 | return false; |
| 401 | } |
| 402 | |
| 403 | /* We've found a dynamic object matching the DT_NEEDED entry. */ |
| 404 | |
| 405 | /* We have already checked that there is no other input file of the |
| 406 | same name. We must now check again that we are not including the |
| 407 | same file twice. We need to do this because on many systems |
| 408 | libc.so is a symlink to, e.g., libc.so.1. The SONAME entry will |
| 409 | reference libc.so.1. If we have already included libc.so, we |
| 410 | don't want to include libc.so.1 if they are the same file, and we |
| 411 | can only check that using stat. */ |
| 412 | |
| 413 | if (bfd_stat (abfd, &global_stat) != 0) |
| 414 | einfo ("%F%P:%B: bfd_stat failed: %E\n", abfd); |
| 415 | global_found = false; |
| 416 | lang_for_each_input_file (gld${EMULATION_NAME}_stat_needed); |
| 417 | if (global_found) |
| 418 | { |
| 419 | /* Return true to indicate that we found the file, even though |
| 420 | we aren't going to do anything with it. */ |
| 421 | return true; |
| 422 | } |
| 423 | |
| 424 | /* Tell the ELF backend that don't want the output file to have a |
| 425 | DT_NEEDED entry for this file. */ |
| 426 | bfd_elf_set_dt_needed_name (abfd, ""); |
| 427 | |
| 428 | /* Add this file into the symbol table. */ |
| 429 | if (! bfd_link_add_symbols (abfd, &link_info)) |
| 430 | einfo ("%F%B: could not read symbols: %E\n", abfd); |
| 431 | |
| 432 | return true; |
| 433 | } |
| 434 | |
| 435 | /* See if an input file matches a DT_NEEDED entry by name. */ |
| 436 | |
| 437 | static void |
| 438 | gld${EMULATION_NAME}_check_needed (s) |
| 439 | lang_input_statement_type *s; |
| 440 | { |
| 441 | if (global_found) |
| 442 | return; |
| 443 | |
| 444 | if (s->filename != NULL |
| 445 | && strcmp (s->filename, global_needed->name) == 0) |
| 446 | { |
| 447 | global_found = true; |
| 448 | return; |
| 449 | } |
| 450 | |
| 451 | if (s->the_bfd != NULL) |
| 452 | { |
| 453 | const char *soname; |
| 454 | |
| 455 | soname = bfd_elf_get_dt_soname (s->the_bfd); |
| 456 | if (soname != NULL |
| 457 | && strcmp (soname, global_needed->name) == 0) |
| 458 | { |
| 459 | global_found = true; |
| 460 | return; |
| 461 | } |
| 462 | } |
| 463 | |
| 464 | if (s->search_dirs_flag |
| 465 | && s->filename != NULL |
| 466 | && strchr (global_needed->name, '/') == NULL) |
| 467 | { |
| 468 | const char *f; |
| 469 | |
| 470 | f = strrchr (s->filename, '/'); |
| 471 | if (f != NULL |
| 472 | && strcmp (f + 1, global_needed->name) == 0) |
| 473 | { |
| 474 | global_found = true; |
| 475 | return; |
| 476 | } |
| 477 | } |
| 478 | } |
| 479 | |
| 480 | /* See if an input file matches a DT_NEEDED entry by running stat on |
| 481 | the file. */ |
| 482 | |
| 483 | static void |
| 484 | gld${EMULATION_NAME}_stat_needed (s) |
| 485 | lang_input_statement_type *s; |
| 486 | { |
| 487 | struct stat st; |
| 488 | const char *suffix; |
| 489 | const char *soname; |
| 490 | const char *f; |
| 491 | |
| 492 | if (global_found) |
| 493 | return; |
| 494 | if (s->the_bfd == NULL) |
| 495 | return; |
| 496 | |
| 497 | if (bfd_stat (s->the_bfd, &st) != 0) |
| 498 | { |
| 499 | einfo ("%P:%B: bfd_stat failed: %E\n", s->the_bfd); |
| 500 | return; |
| 501 | } |
| 502 | |
| 503 | if (st.st_dev == global_stat.st_dev |
| 504 | && st.st_ino == global_stat.st_ino) |
| 505 | { |
| 506 | global_found = true; |
| 507 | return; |
| 508 | } |
| 509 | |
| 510 | /* We issue a warning if it looks like we are including two |
| 511 | different versions of the same shared library. For example, |
| 512 | there may be a problem if -lc picks up libc.so.6 but some other |
| 513 | shared library has a DT_NEEDED entry of libc.so.5. This is a |
| 514 | hueristic test, and it will only work if the name looks like |
| 515 | NAME.so.VERSION. FIXME: Depending on file names is error-prone. |
| 516 | If we really want to issue warnings about mixing version numbers |
| 517 | of shared libraries, we need to find a better way. */ |
| 518 | |
| 519 | if (strchr (global_needed->name, '/') != NULL) |
| 520 | return; |
| 521 | suffix = strstr (global_needed->name, ".so."); |
| 522 | if (suffix == NULL) |
| 523 | return; |
| 524 | suffix += sizeof ".so." - 1; |
| 525 | |
| 526 | soname = bfd_elf_get_dt_soname (s->the_bfd); |
| 527 | if (soname == NULL) |
| 528 | soname = s->filename; |
| 529 | |
| 530 | f = strrchr (soname, '/'); |
| 531 | if (f != NULL) |
| 532 | ++f; |
| 533 | else |
| 534 | f = soname; |
| 535 | |
| 536 | if (strncmp (f, global_needed->name, suffix - global_needed->name) == 0) |
| 537 | einfo ("%P: warning: %s, needed by %B, may conflict with %s\n", |
| 538 | global_needed->name, global_needed->by, f); |
| 539 | } |
| 540 | |
| 541 | /* This is called after the sections have been attached to output |
| 542 | sections, but before any sizes or addresses have been set. */ |
| 543 | |
| 544 | static void |
| 545 | gld${EMULATION_NAME}_before_allocation () |
| 546 | { |
| 547 | const char *rpath; |
| 548 | asection *sinterp; |
| 549 | |
| 550 | /* If we are going to make any variable assignments, we need to let |
| 551 | the ELF backend know about them in case the variables are |
| 552 | referred to by dynamic objects. */ |
| 553 | lang_for_each_statement (gld${EMULATION_NAME}_find_statement_assignment); |
| 554 | |
| 555 | /* Let the ELF backend work out the sizes of any sections required |
| 556 | by dynamic linking. */ |
| 557 | rpath = command_line.rpath; |
| 558 | if (rpath == NULL) |
| 559 | rpath = (const char *) getenv ("LD_RUN_PATH"); |
| 560 | if (! bfd_elf${ELFSIZE}_size_dynamic_sections (output_bfd, |
| 561 | command_line.soname, |
| 562 | rpath, |
| 563 | command_line.export_dynamic, |
| 564 | &link_info, |
| 565 | &sinterp)) |
| 566 | einfo ("%P%F: failed to set dynamic section sizes: %E\n"); |
| 567 | |
| 568 | /* Let the user override the dynamic linker we are using. */ |
| 569 | if (command_line.interpreter != NULL |
| 570 | && sinterp != NULL) |
| 571 | { |
| 572 | sinterp->contents = (bfd_byte *) command_line.interpreter; |
| 573 | sinterp->_raw_size = strlen (command_line.interpreter) + 1; |
| 574 | } |
| 575 | |
| 576 | /* Look for any sections named .gnu.warning. As a GNU extensions, |
| 577 | we treat such sections as containing warning messages. We print |
| 578 | out the warning message, and then zero out the section size so |
| 579 | that it does not get copied into the output file. */ |
| 580 | |
| 581 | { |
| 582 | LANG_FOR_EACH_INPUT_STATEMENT (is) |
| 583 | { |
| 584 | asection *s; |
| 585 | bfd_size_type sz; |
| 586 | char *msg; |
| 587 | boolean ret; |
| 588 | |
| 589 | if (is->just_syms_flag) |
| 590 | continue; |
| 591 | |
| 592 | s = bfd_get_section_by_name (is->the_bfd, ".gnu.warning"); |
| 593 | if (s == NULL) |
| 594 | continue; |
| 595 | |
| 596 | sz = bfd_section_size (is->the_bfd, s); |
| 597 | msg = xmalloc ((size_t) sz + 1); |
| 598 | if (! bfd_get_section_contents (is->the_bfd, s, msg, (file_ptr) 0, sz)) |
| 599 | einfo ("%F%B: Can't read contents of section .gnu.warning: %E\n", |
| 600 | is->the_bfd); |
| 601 | msg[sz] = '\0'; |
| 602 | ret = link_info.callbacks->warning (&link_info, msg, |
| 603 | (const char *) NULL, |
| 604 | is->the_bfd, (asection *) NULL, |
| 605 | (bfd_vma) 0); |
| 606 | ASSERT (ret); |
| 607 | free (msg); |
| 608 | |
| 609 | /* Clobber the section size, so that we don't waste copying the |
| 610 | warning into the output file. */ |
| 611 | s->_raw_size = 0; |
| 612 | } |
| 613 | } |
| 614 | |
| 615 | #if defined (TARGET_IS_elf32bmip) || defined (TARGET_IS_elf32lmip) |
| 616 | /* For MIPS ELF the .reginfo section requires special handling. |
| 617 | Each input section is 24 bytes, and the final output section must |
| 618 | also be 24 bytes. We handle this by clobbering all but the first |
| 619 | input section size to 0. The .reginfo section is handled |
| 620 | specially by the backend code anyhow. */ |
| 621 | { |
| 622 | boolean found = false; |
| 623 | LANG_FOR_EACH_INPUT_STATEMENT (is) |
| 624 | { |
| 625 | asection *s; |
| 626 | |
| 627 | if (is->just_syms_flag) |
| 628 | continue; |
| 629 | |
| 630 | s = bfd_get_section_by_name (is->the_bfd, ".reginfo"); |
| 631 | if (s == NULL) |
| 632 | continue; |
| 633 | |
| 634 | if (! found) |
| 635 | { |
| 636 | found = true; |
| 637 | continue; |
| 638 | } |
| 639 | |
| 640 | s->_raw_size = 0; |
| 641 | s->_cooked_size = 0; |
| 642 | } |
| 643 | } |
| 644 | #endif |
| 645 | } |
| 646 | |
| 647 | /* This is called by the before_allocation routine via |
| 648 | lang_for_each_statement. It locates any assignment statements, and |
| 649 | tells the ELF backend about them, in case they are assignments to |
| 650 | symbols which are referred to by dynamic objects. */ |
| 651 | |
| 652 | static void |
| 653 | gld${EMULATION_NAME}_find_statement_assignment (s) |
| 654 | lang_statement_union_type *s; |
| 655 | { |
| 656 | if (s->header.type == lang_assignment_statement_enum) |
| 657 | gld${EMULATION_NAME}_find_exp_assignment (s->assignment_statement.exp); |
| 658 | } |
| 659 | |
| 660 | /* Look through an expression for an assignment statement. */ |
| 661 | |
| 662 | static void |
| 663 | gld${EMULATION_NAME}_find_exp_assignment (exp) |
| 664 | etree_type *exp; |
| 665 | { |
| 666 | struct bfd_link_hash_entry *h; |
| 667 | |
| 668 | switch (exp->type.node_class) |
| 669 | { |
| 670 | case etree_provide: |
| 671 | h = bfd_link_hash_lookup (link_info.hash, exp->assign.dst, |
| 672 | false, false, false); |
| 673 | if (h == NULL) |
| 674 | break; |
| 675 | |
| 676 | /* We call record_link_assignment even if the symbol is defined. |
| 677 | This is because if it is defined by a dynamic object, we |
| 678 | actually want to use the value defined by the linker script, |
| 679 | not the value from the dynamic object (because we are setting |
| 680 | symbols like etext). If the symbol is defined by a regular |
| 681 | object, then, as it happens, calling record_link_assignment |
| 682 | will do no harm. */ |
| 683 | |
| 684 | /* Fall through. */ |
| 685 | case etree_assign: |
| 686 | if (strcmp (exp->assign.dst, ".") != 0) |
| 687 | { |
| 688 | if (! (bfd_elf${ELFSIZE}_record_link_assignment |
| 689 | (output_bfd, &link_info, exp->assign.dst, |
| 690 | exp->type.node_class == etree_provide ? true : false))) |
| 691 | einfo ("%P%F: failed to record assignment to %s: %E\n", |
| 692 | exp->assign.dst); |
| 693 | } |
| 694 | gld${EMULATION_NAME}_find_exp_assignment (exp->assign.src); |
| 695 | break; |
| 696 | |
| 697 | case etree_binary: |
| 698 | gld${EMULATION_NAME}_find_exp_assignment (exp->binary.lhs); |
| 699 | gld${EMULATION_NAME}_find_exp_assignment (exp->binary.rhs); |
| 700 | break; |
| 701 | |
| 702 | case etree_trinary: |
| 703 | gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.cond); |
| 704 | gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.lhs); |
| 705 | gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.rhs); |
| 706 | break; |
| 707 | |
| 708 | case etree_unary: |
| 709 | gld${EMULATION_NAME}_find_exp_assignment (exp->unary.child); |
| 710 | break; |
| 711 | |
| 712 | default: |
| 713 | break; |
| 714 | } |
| 715 | } |
| 716 | |
| 717 | /* Place an orphan section. We use this to put random SHF_ALLOC |
| 718 | sections in the right segment. */ |
| 719 | |
| 720 | static asection *hold_section; |
| 721 | static lang_output_section_statement_type *hold_use; |
| 722 | static lang_output_section_statement_type *hold_text; |
| 723 | static lang_output_section_statement_type *hold_rodata; |
| 724 | static lang_output_section_statement_type *hold_data; |
| 725 | static lang_output_section_statement_type *hold_bss; |
| 726 | static lang_output_section_statement_type *hold_rel; |
| 727 | |
| 728 | /*ARGSUSED*/ |
| 729 | static boolean |
| 730 | gld${EMULATION_NAME}_place_orphan (file, s) |
| 731 | lang_input_statement_type *file; |
| 732 | asection *s; |
| 733 | { |
| 734 | lang_output_section_statement_type *place; |
| 735 | asection *snew, **pps; |
| 736 | lang_statement_list_type *old; |
| 737 | lang_statement_list_type add; |
| 738 | etree_type *address; |
| 739 | const char *secname, *ps; |
| 740 | lang_output_section_statement_type *os; |
| 741 | |
| 742 | if ((s->flags & SEC_ALLOC) == 0) |
| 743 | return false; |
| 744 | |
| 745 | /* Look through the script to see where to place this section. */ |
| 746 | hold_section = s; |
| 747 | hold_use = NULL; |
| 748 | lang_for_each_statement (gld${EMULATION_NAME}_place_section); |
| 749 | |
| 750 | if (hold_use != NULL) |
| 751 | { |
| 752 | /* We have already placed a section with this name. */ |
| 753 | wild_doit (&hold_use->children, s, hold_use, file); |
| 754 | return true; |
| 755 | } |
| 756 | |
| 757 | secname = bfd_get_section_name (s->owner, s); |
| 758 | |
| 759 | /* If this is a final link, then always put .gnu.warning.SYMBOL |
| 760 | sections into the .text section to get them out of the way. */ |
| 761 | if (! link_info.shared |
| 762 | && ! link_info.relocateable |
| 763 | && strncmp (secname, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0 |
| 764 | && hold_text != NULL) |
| 765 | { |
| 766 | wild_doit (&hold_text->children, s, hold_text, file); |
| 767 | return true; |
| 768 | } |
| 769 | |
| 770 | /* Decide which segment the section should go in based on the |
| 771 | section name and section flags. */ |
| 772 | place = NULL; |
| 773 | if ((s->flags & SEC_HAS_CONTENTS) == 0 |
| 774 | && hold_bss != NULL) |
| 775 | place = hold_bss; |
| 776 | else if ((s->flags & SEC_READONLY) == 0 |
| 777 | && hold_data != NULL) |
| 778 | place = hold_data; |
| 779 | else if (strncmp (secname, ".rel", 4) == 0 |
| 780 | && hold_rel != NULL) |
| 781 | place = hold_rel; |
| 782 | else if ((s->flags & SEC_CODE) == 0 |
| 783 | && (s->flags & SEC_READONLY) != 0 |
| 784 | && hold_rodata != NULL) |
| 785 | place = hold_rodata; |
| 786 | else if ((s->flags & SEC_READONLY) != 0 |
| 787 | && hold_text != NULL) |
| 788 | place = hold_text; |
| 789 | if (place == NULL) |
| 790 | return false; |
| 791 | |
| 792 | /* Create the section in the output file, and put it in the right |
| 793 | place. This shuffling is to make the output file look neater. */ |
| 794 | snew = bfd_make_section (output_bfd, secname); |
| 795 | if (snew == NULL) |
| 796 | einfo ("%P%F: output format %s cannot represent section called %s\n", |
| 797 | output_bfd->xvec->name, secname); |
| 798 | if (place->bfd_section != NULL) |
| 799 | { |
| 800 | for (pps = &output_bfd->sections; *pps != snew; pps = &(*pps)->next) |
| 801 | ; |
| 802 | *pps = snew->next; |
| 803 | snew->next = place->bfd_section->next; |
| 804 | place->bfd_section->next = snew; |
| 805 | } |
| 806 | |
| 807 | /* Start building a list of statements for this section. */ |
| 808 | old = stat_ptr; |
| 809 | stat_ptr = &add; |
| 810 | lang_list_init (stat_ptr); |
| 811 | |
| 812 | /* If the name of the section is representable in C, then create |
| 813 | symbols to mark the start and the end of the section. */ |
| 814 | for (ps = secname; *ps != '\0'; ps++) |
| 815 | if (! isalnum (*ps) && *ps != '_') |
| 816 | break; |
| 817 | if (*ps == '\0' && config.build_constructors) |
| 818 | { |
| 819 | char *symname; |
| 820 | |
| 821 | symname = (char *) xmalloc (ps - secname + sizeof "__start_"); |
| 822 | sprintf (symname, "__start_%s", secname); |
| 823 | lang_add_assignment (exp_assop ('=', symname, |
| 824 | exp_unop (ALIGN_K, |
| 825 | exp_intop ((bfd_vma) 1 |
| 826 | << s->alignment_power)))); |
| 827 | } |
| 828 | |
| 829 | if (! link_info.relocateable) |
| 830 | address = NULL; |
| 831 | else |
| 832 | address = exp_intop ((bfd_vma) 0); |
| 833 | |
| 834 | lang_enter_output_section_statement (secname, address, 0, |
| 835 | (bfd_vma) 0, |
| 836 | (etree_type *) NULL, |
| 837 | (etree_type *) NULL, |
| 838 | (etree_type *) NULL); |
| 839 | |
| 840 | os = lang_output_section_statement_lookup (secname); |
| 841 | wild_doit (&os->children, s, os, file); |
| 842 | |
| 843 | lang_leave_output_section_statement ((bfd_vma) 0, "*default*"); |
| 844 | stat_ptr = &add; |
| 845 | |
| 846 | if (*ps == '\0' && config.build_constructors) |
| 847 | { |
| 848 | char *symname; |
| 849 | |
| 850 | symname = (char *) xmalloc (ps - secname + sizeof "__stop_"); |
| 851 | sprintf (symname, "__stop_%s", secname); |
| 852 | lang_add_assignment (exp_assop ('=', symname, |
| 853 | exp_nameop (NAME, "."))); |
| 854 | } |
| 855 | |
| 856 | /* Now stick the new statement list right after PLACE. */ |
| 857 | *add.tail = place->header.next; |
| 858 | place->header.next = add.head; |
| 859 | |
| 860 | stat_ptr = old; |
| 861 | |
| 862 | return true; |
| 863 | } |
| 864 | |
| 865 | static void |
| 866 | gld${EMULATION_NAME}_place_section (s) |
| 867 | lang_statement_union_type *s; |
| 868 | { |
| 869 | lang_output_section_statement_type *os; |
| 870 | |
| 871 | if (s->header.type != lang_output_section_statement_enum) |
| 872 | return; |
| 873 | |
| 874 | os = &s->output_section_statement; |
| 875 | |
| 876 | if (strcmp (os->name, hold_section->name) == 0) |
| 877 | hold_use = os; |
| 878 | |
| 879 | if (strcmp (os->name, ".text") == 0) |
| 880 | hold_text = os; |
| 881 | else if (strcmp (os->name, ".rodata") == 0) |
| 882 | hold_rodata = os; |
| 883 | else if (strcmp (os->name, ".data") == 0) |
| 884 | hold_data = os; |
| 885 | else if (strcmp (os->name, ".bss") == 0) |
| 886 | hold_bss = os; |
| 887 | else if (hold_rel == NULL |
| 888 | && os->bfd_section != NULL |
| 889 | && strncmp (os->name, ".rel", 4) == 0) |
| 890 | hold_rel = os; |
| 891 | } |
| 892 | |
| 893 | static char * |
| 894 | gld${EMULATION_NAME}_get_script(isfile) |
| 895 | int *isfile; |
| 896 | EOF |
| 897 | |
| 898 | if test -n "$COMPILE_IN" |
| 899 | then |
| 900 | # Scripts compiled in. |
| 901 | |
| 902 | # sed commands to quote an ld script as a C string. |
| 903 | sc='s/["\\]/\\&/g |
| 904 | s/$/\\n\\/ |
| 905 | 1s/^/"/ |
| 906 | $s/$/n"/ |
| 907 | ' |
| 908 | |
| 909 | cat >>e${EMULATION_NAME}.c <<EOF |
| 910 | { |
| 911 | *isfile = 0; |
| 912 | |
| 913 | if (link_info.relocateable == true && config.build_constructors == true) |
| 914 | return `sed "$sc" ldscripts/${EMULATION_NAME}.xu`; |
| 915 | else if (link_info.relocateable == true) |
| 916 | return `sed "$sc" ldscripts/${EMULATION_NAME}.xr`; |
| 917 | else if (!config.text_read_only) |
| 918 | return `sed "$sc" ldscripts/${EMULATION_NAME}.xbn`; |
| 919 | else if (!config.magic_demand_paged) |
| 920 | return `sed "$sc" ldscripts/${EMULATION_NAME}.xn`; |
| 921 | else if (link_info.shared) |
| 922 | return `sed "$sc" ldscripts/${EMULATION_NAME}.xs`; |
| 923 | else |
| 924 | return `sed "$sc" ldscripts/${EMULATION_NAME}.x`; |
| 925 | } |
| 926 | EOF |
| 927 | |
| 928 | else |
| 929 | # Scripts read from the filesystem. |
| 930 | |
| 931 | cat >>e${EMULATION_NAME}.c <<EOF |
| 932 | { |
| 933 | *isfile = 1; |
| 934 | |
| 935 | if (link_info.relocateable == true && config.build_constructors == true) |
| 936 | return "ldscripts/${EMULATION_NAME}.xu"; |
| 937 | else if (link_info.relocateable == true) |
| 938 | return "ldscripts/${EMULATION_NAME}.xr"; |
| 939 | else if (!config.text_read_only) |
| 940 | return "ldscripts/${EMULATION_NAME}.xbn"; |
| 941 | else if (!config.magic_demand_paged) |
| 942 | return "ldscripts/${EMULATION_NAME}.xn"; |
| 943 | else if (link_info.shared) |
| 944 | return "ldscripts/${EMULATION_NAME}.xs"; |
| 945 | else |
| 946 | return "ldscripts/${EMULATION_NAME}.x"; |
| 947 | } |
| 948 | EOF |
| 949 | |
| 950 | fi |
| 951 | |
| 952 | cat >>e${EMULATION_NAME}.c <<EOF |
| 953 | |
| 954 | struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation = |
| 955 | { |
| 956 | gld${EMULATION_NAME}_before_parse, |
| 957 | syslib_default, |
| 958 | hll_default, |
| 959 | after_parse_default, |
| 960 | gld${EMULATION_NAME}_after_open, |
| 961 | after_allocation_default, |
| 962 | set_output_arch_default, |
| 963 | ldemul_default_target, |
| 964 | gld${EMULATION_NAME}_before_allocation, |
| 965 | gld${EMULATION_NAME}_get_script, |
| 966 | "${EMULATION_NAME}", |
| 967 | "${OUTPUT_FORMAT}", |
| 968 | NULL, |
| 969 | NULL, |
| 970 | gld${EMULATION_NAME}_open_dynamic_archive, |
| 971 | gld${EMULATION_NAME}_place_orphan |
| 972 | }; |
| 973 | EOF |