| 1 | /* ldemul.c -- clearing house for ld emulation states |
| 2 | Copyright (C) 1991-2020 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 "getopt.h" |
| 24 | #include "bfdlink.h" |
| 25 | #include "ctf-api.h" |
| 26 | |
| 27 | #include "ld.h" |
| 28 | #include "ldmisc.h" |
| 29 | #include "ldexp.h" |
| 30 | #include "ldlang.h" |
| 31 | #include "ldfile.h" |
| 32 | #include "ldemul.h" |
| 33 | #include "ldmain.h" |
| 34 | #include "ldemul-list.h" |
| 35 | |
| 36 | static ld_emulation_xfer_type *ld_emulation; |
| 37 | |
| 38 | void |
| 39 | ldemul_hll (char *name) |
| 40 | { |
| 41 | ld_emulation->hll (name); |
| 42 | } |
| 43 | |
| 44 | void |
| 45 | ldemul_syslib (char *name) |
| 46 | { |
| 47 | ld_emulation->syslib (name); |
| 48 | } |
| 49 | |
| 50 | void |
| 51 | ldemul_after_parse (void) |
| 52 | { |
| 53 | ld_emulation->after_parse (); |
| 54 | } |
| 55 | |
| 56 | void |
| 57 | ldemul_before_parse (void) |
| 58 | { |
| 59 | ld_emulation->before_parse (); |
| 60 | } |
| 61 | |
| 62 | void |
| 63 | ldemul_after_open (void) |
| 64 | { |
| 65 | ld_emulation->after_open (); |
| 66 | } |
| 67 | |
| 68 | void |
| 69 | ldemul_after_check_relocs (void) |
| 70 | { |
| 71 | ld_emulation->after_check_relocs (); |
| 72 | } |
| 73 | |
| 74 | void |
| 75 | ldemul_before_place_orphans (void) |
| 76 | { |
| 77 | ld_emulation->before_place_orphans (); |
| 78 | } |
| 79 | |
| 80 | void |
| 81 | ldemul_after_allocation (void) |
| 82 | { |
| 83 | ld_emulation->after_allocation (); |
| 84 | } |
| 85 | |
| 86 | void |
| 87 | ldemul_before_allocation (void) |
| 88 | { |
| 89 | ld_emulation->before_allocation (); |
| 90 | } |
| 91 | |
| 92 | void |
| 93 | ldemul_set_output_arch (void) |
| 94 | { |
| 95 | ld_emulation->set_output_arch (); |
| 96 | } |
| 97 | |
| 98 | void |
| 99 | ldemul_finish (void) |
| 100 | { |
| 101 | ld_emulation->finish (); |
| 102 | } |
| 103 | |
| 104 | void |
| 105 | ldemul_set_symbols (void) |
| 106 | { |
| 107 | if (ld_emulation->set_symbols) |
| 108 | ld_emulation->set_symbols (); |
| 109 | } |
| 110 | |
| 111 | void |
| 112 | ldemul_create_output_section_statements (void) |
| 113 | { |
| 114 | if (ld_emulation->create_output_section_statements) |
| 115 | ld_emulation->create_output_section_statements (); |
| 116 | } |
| 117 | |
| 118 | char * |
| 119 | ldemul_get_script (int *isfile) |
| 120 | { |
| 121 | return ld_emulation->get_script (isfile); |
| 122 | } |
| 123 | |
| 124 | bfd_boolean |
| 125 | ldemul_open_dynamic_archive (const char *arch, search_dirs_type *search, |
| 126 | lang_input_statement_type *entry) |
| 127 | { |
| 128 | if (ld_emulation->open_dynamic_archive) |
| 129 | return (*ld_emulation->open_dynamic_archive) (arch, search, entry); |
| 130 | return FALSE; |
| 131 | } |
| 132 | |
| 133 | lang_output_section_statement_type * |
| 134 | ldemul_place_orphan (asection *s, const char *name, int constraint) |
| 135 | { |
| 136 | if (ld_emulation->place_orphan) |
| 137 | return (*ld_emulation->place_orphan) (s, name, constraint); |
| 138 | return NULL; |
| 139 | } |
| 140 | |
| 141 | void |
| 142 | ldemul_add_options (int ns, char **shortopts, int nl, |
| 143 | struct option **longopts, int nrl, |
| 144 | struct option **really_longopts) |
| 145 | { |
| 146 | if (ld_emulation->add_options) |
| 147 | (*ld_emulation->add_options) (ns, shortopts, nl, longopts, |
| 148 | nrl, really_longopts); |
| 149 | } |
| 150 | |
| 151 | bfd_boolean |
| 152 | ldemul_handle_option (int optc) |
| 153 | { |
| 154 | if (ld_emulation->handle_option) |
| 155 | return (*ld_emulation->handle_option) (optc); |
| 156 | return FALSE; |
| 157 | } |
| 158 | |
| 159 | bfd_boolean |
| 160 | ldemul_parse_args (int argc, char **argv) |
| 161 | { |
| 162 | /* Try and use the emulation parser if there is one. */ |
| 163 | if (ld_emulation->parse_args) |
| 164 | return (*ld_emulation->parse_args) (argc, argv); |
| 165 | return FALSE; |
| 166 | } |
| 167 | |
| 168 | /* Let the emulation code handle an unrecognized file. */ |
| 169 | |
| 170 | bfd_boolean |
| 171 | ldemul_unrecognized_file (lang_input_statement_type *entry) |
| 172 | { |
| 173 | if (ld_emulation->unrecognized_file) |
| 174 | return (*ld_emulation->unrecognized_file) (entry); |
| 175 | return FALSE; |
| 176 | } |
| 177 | |
| 178 | /* Let the emulation code handle a recognized file. */ |
| 179 | |
| 180 | bfd_boolean |
| 181 | ldemul_recognized_file (lang_input_statement_type *entry) |
| 182 | { |
| 183 | if (ld_emulation->recognized_file) |
| 184 | return (*ld_emulation->recognized_file) (entry); |
| 185 | return FALSE; |
| 186 | } |
| 187 | |
| 188 | char * |
| 189 | ldemul_choose_target (int argc, char **argv) |
| 190 | { |
| 191 | return ld_emulation->choose_target (argc, argv); |
| 192 | } |
| 193 | |
| 194 | |
| 195 | /* The default choose_target function. */ |
| 196 | |
| 197 | char * |
| 198 | ldemul_default_target (int argc ATTRIBUTE_UNUSED, char **argv ATTRIBUTE_UNUSED) |
| 199 | { |
| 200 | char *from_outside = getenv (TARGET_ENVIRON); |
| 201 | if (from_outside != (char *) NULL) |
| 202 | return from_outside; |
| 203 | return ld_emulation->target_name; |
| 204 | } |
| 205 | |
| 206 | /* If the entry point was not specified as an address, then add the |
| 207 | symbol as undefined. This will cause ld to extract an archive |
| 208 | element defining the entry if ld is linking against such an archive. |
| 209 | |
| 210 | We don't do this when generating shared libraries unless given -e |
| 211 | on the command line, because most shared libs are not designed to |
| 212 | be run as an executable. However, some are, eg. glibc ld.so and |
| 213 | may rely on the default linker script supplying ENTRY. So we can't |
| 214 | remove the ENTRY from the script, but would rather not insert |
| 215 | undefined _start syms. */ |
| 216 | |
| 217 | void |
| 218 | after_parse_default (void) |
| 219 | { |
| 220 | if (entry_symbol.name != NULL |
| 221 | && (bfd_link_executable (&link_info) || entry_from_cmdline)) |
| 222 | { |
| 223 | bfd_boolean is_vma = FALSE; |
| 224 | |
| 225 | if (entry_from_cmdline) |
| 226 | { |
| 227 | const char *send; |
| 228 | |
| 229 | bfd_scan_vma (entry_symbol.name, &send, 0); |
| 230 | is_vma = *send == '\0'; |
| 231 | } |
| 232 | if (!is_vma) |
| 233 | ldlang_add_undef (entry_symbol.name, entry_from_cmdline); |
| 234 | } |
| 235 | if (config.maxpagesize == 0) |
| 236 | config.maxpagesize = bfd_emul_get_maxpagesize (default_target); |
| 237 | if (config.commonpagesize == 0) |
| 238 | config.commonpagesize = bfd_emul_get_commonpagesize (default_target, |
| 239 | link_info.relro); |
| 240 | } |
| 241 | |
| 242 | void |
| 243 | after_open_default (void) |
| 244 | { |
| 245 | link_info.big_endian = TRUE; |
| 246 | |
| 247 | if (bfd_big_endian (link_info.output_bfd)) |
| 248 | ; |
| 249 | else if (bfd_little_endian (link_info.output_bfd)) |
| 250 | link_info.big_endian = FALSE; |
| 251 | else |
| 252 | { |
| 253 | if (command_line.endian == ENDIAN_BIG) |
| 254 | ; |
| 255 | else if (command_line.endian == ENDIAN_LITTLE) |
| 256 | link_info.big_endian = FALSE; |
| 257 | else if (command_line.endian == ENDIAN_UNSET) |
| 258 | { |
| 259 | LANG_FOR_EACH_INPUT_STATEMENT (s) |
| 260 | if (s->the_bfd != NULL) |
| 261 | { |
| 262 | if (bfd_little_endian (s->the_bfd)) |
| 263 | link_info.big_endian = FALSE; |
| 264 | break; |
| 265 | } |
| 266 | } |
| 267 | } |
| 268 | } |
| 269 | |
| 270 | void |
| 271 | after_check_relocs_default (void) |
| 272 | { |
| 273 | } |
| 274 | |
| 275 | void |
| 276 | before_place_orphans_default (void) |
| 277 | { |
| 278 | } |
| 279 | |
| 280 | void |
| 281 | after_allocation_default (void) |
| 282 | { |
| 283 | lang_relax_sections (FALSE); |
| 284 | } |
| 285 | |
| 286 | void |
| 287 | before_allocation_default (void) |
| 288 | { |
| 289 | if (!bfd_link_relocatable (&link_info)) |
| 290 | strip_excluded_output_sections (); |
| 291 | } |
| 292 | |
| 293 | void |
| 294 | finish_default (void) |
| 295 | { |
| 296 | if (!bfd_link_relocatable (&link_info)) |
| 297 | _bfd_fix_excluded_sec_syms (link_info.output_bfd, &link_info); |
| 298 | } |
| 299 | |
| 300 | void |
| 301 | set_output_arch_default (void) |
| 302 | { |
| 303 | /* Set the output architecture and machine if possible. */ |
| 304 | bfd_set_arch_mach (link_info.output_bfd, |
| 305 | ldfile_output_architecture, ldfile_output_machine); |
| 306 | |
| 307 | bfd_emul_set_maxpagesize (output_target, config.maxpagesize); |
| 308 | bfd_emul_set_commonpagesize (output_target, config.commonpagesize); |
| 309 | } |
| 310 | |
| 311 | void |
| 312 | syslib_default (char *ignore ATTRIBUTE_UNUSED) |
| 313 | { |
| 314 | info_msg (_("%pS SYSLIB ignored\n"), NULL); |
| 315 | } |
| 316 | |
| 317 | void |
| 318 | hll_default (char *ignore ATTRIBUTE_UNUSED) |
| 319 | { |
| 320 | info_msg (_("%pS HLL ignored\n"), NULL); |
| 321 | } |
| 322 | |
| 323 | ld_emulation_xfer_type *ld_emulations[] = { EMULATION_LIST }; |
| 324 | |
| 325 | void |
| 326 | ldemul_choose_mode (char *target) |
| 327 | { |
| 328 | ld_emulation_xfer_type **eptr = ld_emulations; |
| 329 | /* Ignore "gld" prefix. */ |
| 330 | if (target[0] == 'g' && target[1] == 'l' && target[2] == 'd') |
| 331 | target += 3; |
| 332 | for (; *eptr; eptr++) |
| 333 | { |
| 334 | if (strcmp (target, (*eptr)->emulation_name) == 0) |
| 335 | { |
| 336 | ld_emulation = *eptr; |
| 337 | return; |
| 338 | } |
| 339 | } |
| 340 | einfo (_("%P: unrecognised emulation mode: %s\n"), target); |
| 341 | einfo (_("Supported emulations: ")); |
| 342 | ldemul_list_emulations (stderr); |
| 343 | einfo ("%F\n"); |
| 344 | } |
| 345 | |
| 346 | void |
| 347 | ldemul_list_emulations (FILE *f) |
| 348 | { |
| 349 | ld_emulation_xfer_type **eptr = ld_emulations; |
| 350 | bfd_boolean first = TRUE; |
| 351 | |
| 352 | for (; *eptr; eptr++) |
| 353 | { |
| 354 | if (first) |
| 355 | first = FALSE; |
| 356 | else |
| 357 | fprintf (f, " "); |
| 358 | fprintf (f, "%s", (*eptr)->emulation_name); |
| 359 | } |
| 360 | } |
| 361 | |
| 362 | void |
| 363 | ldemul_list_emulation_options (FILE *f) |
| 364 | { |
| 365 | ld_emulation_xfer_type **eptr; |
| 366 | int options_found = 0; |
| 367 | |
| 368 | for (eptr = ld_emulations; *eptr; eptr++) |
| 369 | { |
| 370 | ld_emulation_xfer_type *emul = *eptr; |
| 371 | |
| 372 | if (emul->list_options) |
| 373 | { |
| 374 | fprintf (f, "%s: \n", emul->emulation_name); |
| 375 | |
| 376 | emul->list_options (f); |
| 377 | |
| 378 | options_found = 1; |
| 379 | } |
| 380 | } |
| 381 | |
| 382 | if (!options_found) |
| 383 | fprintf (f, _(" no emulation specific options.\n")); |
| 384 | } |
| 385 | |
| 386 | int |
| 387 | ldemul_find_potential_libraries (char *name, lang_input_statement_type *entry) |
| 388 | { |
| 389 | if (ld_emulation->find_potential_libraries) |
| 390 | return ld_emulation->find_potential_libraries (name, entry); |
| 391 | |
| 392 | return 0; |
| 393 | } |
| 394 | |
| 395 | struct bfd_elf_version_expr * |
| 396 | ldemul_new_vers_pattern (struct bfd_elf_version_expr *entry) |
| 397 | { |
| 398 | if (ld_emulation->new_vers_pattern) |
| 399 | entry = (*ld_emulation->new_vers_pattern) (entry); |
| 400 | return entry; |
| 401 | } |
| 402 | |
| 403 | void |
| 404 | ldemul_extra_map_file_text (bfd *abfd, struct bfd_link_info *info, FILE *mapf) |
| 405 | { |
| 406 | if (ld_emulation->extra_map_file_text) |
| 407 | ld_emulation->extra_map_file_text (abfd, info, mapf); |
| 408 | } |
| 409 | |
| 410 | int |
| 411 | ldemul_emit_ctf_early (void) |
| 412 | { |
| 413 | if (ld_emulation->emit_ctf_early) |
| 414 | return ld_emulation->emit_ctf_early (); |
| 415 | /* If the emulation doesn't know if it wants to emit CTF early, it is going |
| 416 | to do so. */ |
| 417 | return 1; |
| 418 | } |
| 419 | |
| 420 | void |
| 421 | ldemul_examine_strtab_for_ctf (struct ctf_file *ctf_output, |
| 422 | struct elf_sym_strtab *syms, |
| 423 | bfd_size_type symcount, |
| 424 | struct elf_strtab_hash *symstrtab) |
| 425 | |
| 426 | { |
| 427 | if (ld_emulation->examine_strtab_for_ctf) |
| 428 | ld_emulation->examine_strtab_for_ctf (ctf_output, syms, |
| 429 | symcount, symstrtab); |
| 430 | } |