| 1 | /* Darwin support for GDB, the GNU debugger. |
| 2 | Copyright (C) 2008-2020 Free Software Foundation, Inc. |
| 3 | |
| 4 | Contributed by AdaCore. |
| 5 | |
| 6 | This file is part of GDB. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 20 | |
| 21 | #include "defs.h" |
| 22 | #include "symtab.h" |
| 23 | #include "gdbtypes.h" |
| 24 | #include "bfd.h" |
| 25 | #include "symfile.h" |
| 26 | #include "objfiles.h" |
| 27 | #include "gdbcmd.h" |
| 28 | #include "gdbcore.h" |
| 29 | #include "mach-o.h" |
| 30 | #include "aout/stab_gnu.h" |
| 31 | #include "complaints.h" |
| 32 | #include "gdb_bfd.h" |
| 33 | #include <string> |
| 34 | #include <algorithm> |
| 35 | |
| 36 | /* If non-zero displays debugging message. */ |
| 37 | static unsigned int mach_o_debug_level = 0; |
| 38 | |
| 39 | /* Dwarf debugging information are never in the final executable. They stay |
| 40 | in object files and the executable contains the list of object files read |
| 41 | during the link. |
| 42 | Each time an oso (other source) is found in the executable, the reader |
| 43 | creates such a structure. They are read after the processing of the |
| 44 | executable. */ |
| 45 | |
| 46 | struct oso_el |
| 47 | { |
| 48 | oso_el (asymbol **oso_sym_, asymbol **end_sym_, unsigned int nbr_syms_) |
| 49 | : name((*oso_sym_)->name), |
| 50 | mtime((*oso_sym_)->value), |
| 51 | oso_sym(oso_sym_), |
| 52 | end_sym(end_sym_), |
| 53 | nbr_syms(nbr_syms_) |
| 54 | { |
| 55 | } |
| 56 | |
| 57 | /* Object file name. Can also be a member name. */ |
| 58 | const char *name; |
| 59 | |
| 60 | /* Associated time stamp. */ |
| 61 | unsigned long mtime; |
| 62 | |
| 63 | /* Stab symbols range for this OSO. */ |
| 64 | asymbol **oso_sym; |
| 65 | asymbol **end_sym; |
| 66 | |
| 67 | /* Number of interesting stabs in the range. */ |
| 68 | unsigned int nbr_syms; |
| 69 | }; |
| 70 | |
| 71 | static void |
| 72 | macho_new_init (struct objfile *objfile) |
| 73 | { |
| 74 | } |
| 75 | |
| 76 | static void |
| 77 | macho_symfile_init (struct objfile *objfile) |
| 78 | { |
| 79 | objfile->flags |= OBJF_REORDERED; |
| 80 | } |
| 81 | |
| 82 | /* Add symbol SYM to the minimal symbol table of OBJFILE. */ |
| 83 | |
| 84 | static void |
| 85 | macho_symtab_add_minsym (minimal_symbol_reader &reader, |
| 86 | struct objfile *objfile, const asymbol *sym) |
| 87 | { |
| 88 | if (sym->name == NULL || *sym->name == '\0') |
| 89 | { |
| 90 | /* Skip names that don't exist (shouldn't happen), or names |
| 91 | that are null strings (may happen). */ |
| 92 | return; |
| 93 | } |
| 94 | |
| 95 | if (sym->flags & (BSF_GLOBAL | BSF_LOCAL | BSF_WEAK)) |
| 96 | { |
| 97 | CORE_ADDR symaddr; |
| 98 | enum minimal_symbol_type ms_type; |
| 99 | |
| 100 | /* Bfd symbols are section relative. */ |
| 101 | symaddr = sym->value + sym->section->vma; |
| 102 | |
| 103 | if (sym->section == bfd_abs_section_ptr) |
| 104 | ms_type = mst_abs; |
| 105 | else if (sym->section->flags & SEC_CODE) |
| 106 | { |
| 107 | if (sym->flags & (BSF_GLOBAL | BSF_WEAK)) |
| 108 | ms_type = mst_text; |
| 109 | else |
| 110 | ms_type = mst_file_text; |
| 111 | } |
| 112 | else if (sym->section->flags & SEC_ALLOC) |
| 113 | { |
| 114 | if (sym->flags & (BSF_GLOBAL | BSF_WEAK)) |
| 115 | { |
| 116 | if (sym->section->flags & SEC_LOAD) |
| 117 | ms_type = mst_data; |
| 118 | else |
| 119 | ms_type = mst_bss; |
| 120 | } |
| 121 | else if (sym->flags & BSF_LOCAL) |
| 122 | { |
| 123 | /* Not a special stabs-in-elf symbol, do regular |
| 124 | symbol processing. */ |
| 125 | if (sym->section->flags & SEC_LOAD) |
| 126 | ms_type = mst_file_data; |
| 127 | else |
| 128 | ms_type = mst_file_bss; |
| 129 | } |
| 130 | else |
| 131 | ms_type = mst_unknown; |
| 132 | } |
| 133 | else |
| 134 | return; /* Skip this symbol. */ |
| 135 | |
| 136 | reader.record_with_info (sym->name, symaddr, ms_type, |
| 137 | gdb_bfd_section_index (objfile->obfd, |
| 138 | sym->section)); |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | /* Build the minimal symbol table from SYMBOL_TABLE of length |
| 143 | NUMBER_OF_SYMBOLS for OBJFILE. Registers OSO filenames found. */ |
| 144 | |
| 145 | static void |
| 146 | macho_symtab_read (minimal_symbol_reader &reader, |
| 147 | struct objfile *objfile, |
| 148 | long number_of_symbols, asymbol **symbol_table, |
| 149 | std::vector<oso_el> *oso_vector_ptr) |
| 150 | { |
| 151 | long i; |
| 152 | const asymbol *file_so = NULL; |
| 153 | asymbol **oso_file = NULL; |
| 154 | unsigned int nbr_syms = 0; |
| 155 | |
| 156 | /* Current state while reading stabs. */ |
| 157 | enum |
| 158 | { |
| 159 | /* Not within an SO part. Only non-debugging symbols should be present, |
| 160 | and will be added to the minimal symbols table. */ |
| 161 | S_NO_SO, |
| 162 | |
| 163 | /* First SO read. Introduce an SO section, and may be followed by a second |
| 164 | SO. The SO section should contain onl debugging symbols. */ |
| 165 | S_FIRST_SO, |
| 166 | |
| 167 | /* Second non-null SO found, just after the first one. Means that the first |
| 168 | is in fact a directory name. */ |
| 169 | S_SECOND_SO, |
| 170 | |
| 171 | /* Non-null OSO found. Debugging info are DWARF in this OSO file. */ |
| 172 | S_DWARF_FILE, |
| 173 | |
| 174 | S_STAB_FILE |
| 175 | } state = S_NO_SO; |
| 176 | |
| 177 | for (i = 0; i < number_of_symbols; i++) |
| 178 | { |
| 179 | const asymbol *sym = symbol_table[i]; |
| 180 | bfd_mach_o_asymbol *mach_o_sym = (bfd_mach_o_asymbol *)sym; |
| 181 | |
| 182 | switch (state) |
| 183 | { |
| 184 | case S_NO_SO: |
| 185 | if (mach_o_sym->n_type == N_SO) |
| 186 | { |
| 187 | /* Start of object stab. */ |
| 188 | if (sym->name == NULL || sym->name[0] == 0) |
| 189 | { |
| 190 | /* Unexpected empty N_SO. */ |
| 191 | complaint (_("Unexpected empty N_SO stab")); |
| 192 | } |
| 193 | else |
| 194 | { |
| 195 | file_so = sym; |
| 196 | state = S_FIRST_SO; |
| 197 | } |
| 198 | } |
| 199 | else if (sym->flags & BSF_DEBUGGING) |
| 200 | { |
| 201 | if (mach_o_sym->n_type == N_OPT) |
| 202 | { |
| 203 | /* No complaint for OPT. */ |
| 204 | break; |
| 205 | } |
| 206 | |
| 207 | /* Debugging symbols are not expected here. */ |
| 208 | complaint (_("%s: Unexpected debug stab outside SO markers"), |
| 209 | objfile_name (objfile)); |
| 210 | } |
| 211 | else |
| 212 | { |
| 213 | /* Non-debugging symbols go to the minimal symbol table. */ |
| 214 | macho_symtab_add_minsym (reader, objfile, sym); |
| 215 | } |
| 216 | break; |
| 217 | |
| 218 | case S_FIRST_SO: |
| 219 | case S_SECOND_SO: |
| 220 | if (mach_o_sym->n_type == N_SO) |
| 221 | { |
| 222 | if (sym->name == NULL || sym->name[0] == 0) |
| 223 | { |
| 224 | /* Unexpected empty N_SO. */ |
| 225 | complaint (_("Empty SO section")); |
| 226 | state = S_NO_SO; |
| 227 | } |
| 228 | else if (state == S_FIRST_SO) |
| 229 | { |
| 230 | /* Second SO stab for the file name. */ |
| 231 | file_so = sym; |
| 232 | state = S_SECOND_SO; |
| 233 | } |
| 234 | else |
| 235 | complaint (_("Three SO in a raw")); |
| 236 | } |
| 237 | else if (mach_o_sym->n_type == N_OSO) |
| 238 | { |
| 239 | if (sym->name == NULL || sym->name[0] == 0) |
| 240 | { |
| 241 | /* Empty OSO. Means that this file was compiled with |
| 242 | stabs. */ |
| 243 | state = S_STAB_FILE; |
| 244 | warning (_("stabs debugging not supported for %s"), |
| 245 | file_so->name); |
| 246 | } |
| 247 | else |
| 248 | { |
| 249 | /* Non-empty OSO for a Dwarf file. */ |
| 250 | oso_file = symbol_table + i; |
| 251 | nbr_syms = 0; |
| 252 | state = S_DWARF_FILE; |
| 253 | } |
| 254 | } |
| 255 | else |
| 256 | complaint (_("Unexpected stab after SO")); |
| 257 | break; |
| 258 | |
| 259 | case S_STAB_FILE: |
| 260 | case S_DWARF_FILE: |
| 261 | if (mach_o_sym->n_type == N_SO) |
| 262 | { |
| 263 | if (sym->name == NULL || sym->name[0] == 0) |
| 264 | { |
| 265 | /* End of file. */ |
| 266 | if (state == S_DWARF_FILE) |
| 267 | oso_vector_ptr->emplace_back (oso_file, symbol_table + i, |
| 268 | nbr_syms); |
| 269 | state = S_NO_SO; |
| 270 | } |
| 271 | else |
| 272 | { |
| 273 | complaint (_("Missing nul SO")); |
| 274 | file_so = sym; |
| 275 | state = S_FIRST_SO; |
| 276 | } |
| 277 | } |
| 278 | else if (sym->flags & BSF_DEBUGGING) |
| 279 | { |
| 280 | if (state == S_STAB_FILE) |
| 281 | { |
| 282 | /* FIXME: to be implemented. */ |
| 283 | } |
| 284 | else |
| 285 | { |
| 286 | switch (mach_o_sym->n_type) |
| 287 | { |
| 288 | case N_FUN: |
| 289 | if (sym->name == NULL || sym->name[0] == 0) |
| 290 | break; |
| 291 | /* Fall through. */ |
| 292 | case N_STSYM: |
| 293 | /* Interesting symbol. */ |
| 294 | nbr_syms++; |
| 295 | break; |
| 296 | case N_ENSYM: |
| 297 | case N_BNSYM: |
| 298 | case N_GSYM: |
| 299 | break; |
| 300 | default: |
| 301 | complaint (_("unhandled stab for dwarf OSO file")); |
| 302 | break; |
| 303 | } |
| 304 | } |
| 305 | } |
| 306 | else |
| 307 | complaint (_("non-debugging symbol within SO")); |
| 308 | break; |
| 309 | } |
| 310 | } |
| 311 | |
| 312 | if (state != S_NO_SO) |
| 313 | complaint (_("missing nul SO")); |
| 314 | } |
| 315 | |
| 316 | /* If NAME describes an archive member (ie: ARCHIVE '(' MEMBER ')'), |
| 317 | returns the length of the archive name. |
| 318 | Returns -1 otherwise. */ |
| 319 | |
| 320 | static int |
| 321 | get_archive_prefix_len (const char *name) |
| 322 | { |
| 323 | const char *lparen; |
| 324 | int name_len = strlen (name); |
| 325 | |
| 326 | if (name_len == 0 || name[name_len - 1] != ')') |
| 327 | return -1; |
| 328 | |
| 329 | lparen = strrchr (name, '('); |
| 330 | if (lparen == NULL || lparen == name) |
| 331 | return -1; |
| 332 | return lparen - name; |
| 333 | } |
| 334 | |
| 335 | /* Compare function to std::sort OSOs, so that members of a library |
| 336 | are gathered. */ |
| 337 | |
| 338 | static bool |
| 339 | oso_el_compare_name (const oso_el &l, const oso_el &r) |
| 340 | { |
| 341 | return strcmp (l.name, r.name) < 0; |
| 342 | } |
| 343 | |
| 344 | /* Hash table entry structure for the stabs symbols in the main object file. |
| 345 | This is used to speed up lookup for symbols in the OSO. */ |
| 346 | |
| 347 | struct macho_sym_hash_entry |
| 348 | { |
| 349 | struct bfd_hash_entry base; |
| 350 | const asymbol *sym; |
| 351 | }; |
| 352 | |
| 353 | /* Routine to create an entry in the hash table. */ |
| 354 | |
| 355 | static struct bfd_hash_entry * |
| 356 | macho_sym_hash_newfunc (struct bfd_hash_entry *entry, |
| 357 | struct bfd_hash_table *table, |
| 358 | const char *string) |
| 359 | { |
| 360 | struct macho_sym_hash_entry *ret = (struct macho_sym_hash_entry *) entry; |
| 361 | |
| 362 | /* Allocate the structure if it has not already been allocated by a |
| 363 | subclass. */ |
| 364 | if (ret == NULL) |
| 365 | ret = (struct macho_sym_hash_entry *) bfd_hash_allocate (table, |
| 366 | sizeof (* ret)); |
| 367 | if (ret == NULL) |
| 368 | return NULL; |
| 369 | |
| 370 | /* Call the allocation method of the superclass. */ |
| 371 | ret = (struct macho_sym_hash_entry *) |
| 372 | bfd_hash_newfunc ((struct bfd_hash_entry *) ret, table, string); |
| 373 | |
| 374 | if (ret) |
| 375 | { |
| 376 | /* Initialize the local fields. */ |
| 377 | ret->sym = NULL; |
| 378 | } |
| 379 | |
| 380 | return (struct bfd_hash_entry *) ret; |
| 381 | } |
| 382 | |
| 383 | /* Get the value of SYM from the minimal symtab of MAIN_OBJFILE. This is used |
| 384 | to get the value of global and common symbols. */ |
| 385 | |
| 386 | static CORE_ADDR |
| 387 | macho_resolve_oso_sym_with_minsym (struct objfile *main_objfile, asymbol *sym) |
| 388 | { |
| 389 | /* For common symbol and global symbols, use the min symtab. */ |
| 390 | struct bound_minimal_symbol msym; |
| 391 | const char *name = sym->name; |
| 392 | |
| 393 | if (name[0] == bfd_get_symbol_leading_char (main_objfile->obfd)) |
| 394 | ++name; |
| 395 | msym = lookup_minimal_symbol (name, NULL, main_objfile); |
| 396 | if (msym.minsym == NULL) |
| 397 | { |
| 398 | warning (_("can't find symbol '%s' in minsymtab"), name); |
| 399 | return 0; |
| 400 | } |
| 401 | else |
| 402 | return BMSYMBOL_VALUE_ADDRESS (msym); |
| 403 | } |
| 404 | |
| 405 | /* Add oso file OSO/ABFD as a symbol file. */ |
| 406 | |
| 407 | static void |
| 408 | macho_add_oso_symfile (oso_el *oso, const gdb_bfd_ref_ptr &abfd, |
| 409 | const char *name, |
| 410 | struct objfile *main_objfile, |
| 411 | symfile_add_flags symfile_flags) |
| 412 | { |
| 413 | int storage; |
| 414 | int i; |
| 415 | asymbol **symbol_table; |
| 416 | asymbol **symp; |
| 417 | struct bfd_hash_table table; |
| 418 | int nbr_sections; |
| 419 | |
| 420 | /* Per section flag to mark which section have been rebased. */ |
| 421 | unsigned char *sections_rebased; |
| 422 | |
| 423 | if (mach_o_debug_level > 0) |
| 424 | printf_unfiltered |
| 425 | (_("Loading debugging symbols from oso: %s\n"), oso->name); |
| 426 | |
| 427 | if (!bfd_check_format (abfd.get (), bfd_object)) |
| 428 | { |
| 429 | warning (_("`%s': can't read symbols: %s."), oso->name, |
| 430 | bfd_errmsg (bfd_get_error ())); |
| 431 | return; |
| 432 | } |
| 433 | |
| 434 | if (abfd->my_archive == NULL && oso->mtime != bfd_get_mtime (abfd.get ())) |
| 435 | { |
| 436 | warning (_("`%s': file time stamp mismatch."), oso->name); |
| 437 | return; |
| 438 | } |
| 439 | |
| 440 | if (!bfd_hash_table_init_n (&table, macho_sym_hash_newfunc, |
| 441 | sizeof (struct macho_sym_hash_entry), |
| 442 | oso->nbr_syms)) |
| 443 | { |
| 444 | warning (_("`%s': can't create hash table"), oso->name); |
| 445 | return; |
| 446 | } |
| 447 | |
| 448 | bfd_set_cacheable (abfd.get (), 1); |
| 449 | |
| 450 | /* Read symbols table. */ |
| 451 | storage = bfd_get_symtab_upper_bound (abfd.get ()); |
| 452 | symbol_table = (asymbol **) xmalloc (storage); |
| 453 | bfd_canonicalize_symtab (abfd.get (), symbol_table); |
| 454 | |
| 455 | /* Init section flags. */ |
| 456 | nbr_sections = bfd_count_sections (abfd.get ()); |
| 457 | sections_rebased = (unsigned char *) alloca (nbr_sections); |
| 458 | for (i = 0; i < nbr_sections; i++) |
| 459 | sections_rebased[i] = 0; |
| 460 | |
| 461 | /* Put symbols for the OSO file in the hash table. */ |
| 462 | for (symp = oso->oso_sym; symp != oso->end_sym; symp++) |
| 463 | { |
| 464 | const asymbol *sym = *symp; |
| 465 | bfd_mach_o_asymbol *mach_o_sym = (bfd_mach_o_asymbol *)sym; |
| 466 | |
| 467 | switch (mach_o_sym->n_type) |
| 468 | { |
| 469 | case N_ENSYM: |
| 470 | case N_BNSYM: |
| 471 | case N_GSYM: |
| 472 | sym = NULL; |
| 473 | break; |
| 474 | case N_FUN: |
| 475 | if (sym->name == NULL || sym->name[0] == 0) |
| 476 | sym = NULL; |
| 477 | break; |
| 478 | case N_STSYM: |
| 479 | break; |
| 480 | default: |
| 481 | sym = NULL; |
| 482 | break; |
| 483 | } |
| 484 | if (sym != NULL) |
| 485 | { |
| 486 | struct macho_sym_hash_entry *ent; |
| 487 | |
| 488 | ent = (struct macho_sym_hash_entry *) |
| 489 | bfd_hash_lookup (&table, sym->name, TRUE, FALSE); |
| 490 | if (ent->sym != NULL) |
| 491 | complaint (_("Duplicated symbol %s in symbol table"), sym->name); |
| 492 | else |
| 493 | { |
| 494 | if (mach_o_debug_level > 4) |
| 495 | { |
| 496 | struct gdbarch *arch = main_objfile->arch (); |
| 497 | printf_unfiltered |
| 498 | (_("Adding symbol %s (addr: %s)\n"), |
| 499 | sym->name, paddress (arch, sym->value)); |
| 500 | } |
| 501 | ent->sym = sym; |
| 502 | } |
| 503 | } |
| 504 | } |
| 505 | |
| 506 | /* Relocate symbols of the OSO. */ |
| 507 | for (i = 0; symbol_table[i]; i++) |
| 508 | { |
| 509 | asymbol *sym = symbol_table[i]; |
| 510 | bfd_mach_o_asymbol *mach_o_sym = (bfd_mach_o_asymbol *)sym; |
| 511 | |
| 512 | if (mach_o_sym->n_type & BFD_MACH_O_N_STAB) |
| 513 | continue; |
| 514 | if ((mach_o_sym->n_type & BFD_MACH_O_N_TYPE) == BFD_MACH_O_N_UNDF |
| 515 | && sym->value != 0) |
| 516 | { |
| 517 | /* For common symbol use the min symtab and modify the OSO |
| 518 | symbol table. */ |
| 519 | CORE_ADDR res; |
| 520 | |
| 521 | res = macho_resolve_oso_sym_with_minsym (main_objfile, sym); |
| 522 | if (res != 0) |
| 523 | { |
| 524 | sym->section = bfd_com_section_ptr; |
| 525 | sym->value = res; |
| 526 | } |
| 527 | } |
| 528 | else if ((mach_o_sym->n_type & BFD_MACH_O_N_TYPE) == BFD_MACH_O_N_SECT) |
| 529 | { |
| 530 | /* Normal symbol. */ |
| 531 | asection *sec = sym->section; |
| 532 | bfd_mach_o_section *msec; |
| 533 | unsigned int sec_type; |
| 534 | |
| 535 | /* Skip buggy ones. */ |
| 536 | if (sec == NULL || sections_rebased[sec->index] != 0) |
| 537 | continue; |
| 538 | |
| 539 | /* Only consider regular, non-debugging sections. */ |
| 540 | msec = bfd_mach_o_get_mach_o_section (sec); |
| 541 | sec_type = msec->flags & BFD_MACH_O_SECTION_TYPE_MASK; |
| 542 | if ((sec_type == BFD_MACH_O_S_REGULAR |
| 543 | || sec_type == BFD_MACH_O_S_ZEROFILL) |
| 544 | && (msec->flags & BFD_MACH_O_S_ATTR_DEBUG) == 0) |
| 545 | { |
| 546 | CORE_ADDR addr = 0; |
| 547 | |
| 548 | if ((mach_o_sym->n_type & BFD_MACH_O_N_EXT) != 0) |
| 549 | { |
| 550 | /* Use the min symtab for global symbols. */ |
| 551 | addr = macho_resolve_oso_sym_with_minsym (main_objfile, sym); |
| 552 | } |
| 553 | else |
| 554 | { |
| 555 | struct macho_sym_hash_entry *ent; |
| 556 | |
| 557 | ent = (struct macho_sym_hash_entry *) |
| 558 | bfd_hash_lookup (&table, sym->name, FALSE, FALSE); |
| 559 | if (ent != NULL) |
| 560 | addr = bfd_asymbol_value (ent->sym); |
| 561 | } |
| 562 | |
| 563 | /* Adjust the section. */ |
| 564 | if (addr != 0) |
| 565 | { |
| 566 | CORE_ADDR res = addr - sym->value; |
| 567 | |
| 568 | if (mach_o_debug_level > 3) |
| 569 | { |
| 570 | struct gdbarch *arch = main_objfile->arch (); |
| 571 | printf_unfiltered |
| 572 | (_("resolve sect %s with %s (set to %s)\n"), |
| 573 | sec->name, sym->name, |
| 574 | paddress (arch, res)); |
| 575 | } |
| 576 | bfd_set_section_vma (sec, res); |
| 577 | sections_rebased[sec->index] = 1; |
| 578 | } |
| 579 | } |
| 580 | else |
| 581 | { |
| 582 | /* Mark the section as never rebased. */ |
| 583 | sections_rebased[sec->index] = 2; |
| 584 | } |
| 585 | } |
| 586 | } |
| 587 | |
| 588 | bfd_hash_table_free (&table); |
| 589 | |
| 590 | /* We need to clear SYMFILE_MAINLINE to avoid interactive question |
| 591 | from symfile.c:symbol_file_add_with_addrs_or_offsets. */ |
| 592 | symbol_file_add_from_bfd |
| 593 | (abfd.get (), name, symfile_flags & ~(SYMFILE_MAINLINE | SYMFILE_VERBOSE), |
| 594 | NULL, |
| 595 | main_objfile->flags & (OBJF_REORDERED | OBJF_SHARED |
| 596 | | OBJF_READNOW | OBJF_USERLOADED), |
| 597 | main_objfile); |
| 598 | } |
| 599 | |
| 600 | /* Read symbols from the vector of oso files. |
| 601 | |
| 602 | Note that this function sorts OSO_VECTOR_PTR. */ |
| 603 | |
| 604 | static void |
| 605 | macho_symfile_read_all_oso (std::vector<oso_el> *oso_vector_ptr, |
| 606 | struct objfile *main_objfile, |
| 607 | symfile_add_flags symfile_flags) |
| 608 | { |
| 609 | int ix; |
| 610 | oso_el *oso; |
| 611 | |
| 612 | /* Sort oso by name so that files from libraries are gathered. */ |
| 613 | std::sort (oso_vector_ptr->begin (), oso_vector_ptr->end (), |
| 614 | oso_el_compare_name); |
| 615 | |
| 616 | for (ix = 0; ix < oso_vector_ptr->size ();) |
| 617 | { |
| 618 | int pfx_len; |
| 619 | |
| 620 | oso = &(*oso_vector_ptr)[ix]; |
| 621 | |
| 622 | /* Check if this is a library name. */ |
| 623 | pfx_len = get_archive_prefix_len (oso->name); |
| 624 | if (pfx_len > 0) |
| 625 | { |
| 626 | int last_ix; |
| 627 | oso_el *oso2; |
| 628 | int ix2; |
| 629 | |
| 630 | std::string archive_name (oso->name, pfx_len); |
| 631 | |
| 632 | /* Compute number of oso for this archive. */ |
| 633 | for (last_ix = ix; last_ix < oso_vector_ptr->size (); last_ix++) |
| 634 | { |
| 635 | oso2 = &(*oso_vector_ptr)[last_ix]; |
| 636 | if (strncmp (oso2->name, archive_name.c_str (), pfx_len) != 0) |
| 637 | break; |
| 638 | } |
| 639 | |
| 640 | /* Open the archive and check the format. */ |
| 641 | gdb_bfd_ref_ptr archive_bfd (gdb_bfd_open (archive_name.c_str (), |
| 642 | gnutarget)); |
| 643 | if (archive_bfd == NULL) |
| 644 | { |
| 645 | warning (_("Could not open OSO archive file \"%s\""), |
| 646 | archive_name.c_str ()); |
| 647 | ix = last_ix; |
| 648 | continue; |
| 649 | } |
| 650 | if (!bfd_check_format (archive_bfd.get (), bfd_archive)) |
| 651 | { |
| 652 | warning (_("OSO archive file \"%s\" not an archive."), |
| 653 | archive_name.c_str ()); |
| 654 | ix = last_ix; |
| 655 | continue; |
| 656 | } |
| 657 | |
| 658 | gdb_bfd_ref_ptr member_bfd |
| 659 | (gdb_bfd_openr_next_archived_file (archive_bfd.get (), NULL)); |
| 660 | |
| 661 | if (member_bfd == NULL) |
| 662 | { |
| 663 | warning (_("Could not read archive members out of " |
| 664 | "OSO archive \"%s\""), archive_name.c_str ()); |
| 665 | ix = last_ix; |
| 666 | continue; |
| 667 | } |
| 668 | |
| 669 | /* Load all oso in this library. */ |
| 670 | while (member_bfd != NULL) |
| 671 | { |
| 672 | const char *member_name = bfd_get_filename (member_bfd.get ()); |
| 673 | int member_len = strlen (member_name); |
| 674 | |
| 675 | /* If this member is referenced, add it as a symfile. */ |
| 676 | for (ix2 = ix; ix2 < last_ix; ix2++) |
| 677 | { |
| 678 | oso2 = &(*oso_vector_ptr)[ix2]; |
| 679 | |
| 680 | if (oso2->name |
| 681 | && strlen (oso2->name) == pfx_len + member_len + 2 |
| 682 | && !memcmp (member_name, oso2->name + pfx_len + 1, |
| 683 | member_len)) |
| 684 | { |
| 685 | macho_add_oso_symfile (oso2, member_bfd, |
| 686 | bfd_get_filename (member_bfd.get ()), |
| 687 | main_objfile, symfile_flags); |
| 688 | oso2->name = NULL; |
| 689 | break; |
| 690 | } |
| 691 | } |
| 692 | |
| 693 | member_bfd = gdb_bfd_openr_next_archived_file (archive_bfd.get (), |
| 694 | member_bfd.get ()); |
| 695 | } |
| 696 | for (ix2 = ix; ix2 < last_ix; ix2++) |
| 697 | { |
| 698 | oso2 = &(*oso_vector_ptr)[ix2]; |
| 699 | |
| 700 | if (oso2->name != NULL) |
| 701 | warning (_("Could not find specified archive member " |
| 702 | "for OSO name \"%s\""), oso->name); |
| 703 | } |
| 704 | ix = last_ix; |
| 705 | } |
| 706 | else |
| 707 | { |
| 708 | gdb_bfd_ref_ptr abfd (gdb_bfd_open (oso->name, gnutarget)); |
| 709 | if (abfd == NULL) |
| 710 | warning (_("`%s': can't open to read symbols: %s."), oso->name, |
| 711 | bfd_errmsg (bfd_get_error ())); |
| 712 | else |
| 713 | macho_add_oso_symfile (oso, abfd, oso->name, main_objfile, |
| 714 | symfile_flags); |
| 715 | |
| 716 | ix++; |
| 717 | } |
| 718 | } |
| 719 | } |
| 720 | |
| 721 | /* DSYM (debug symbols) files contain the debug info of an executable. |
| 722 | This is a separate file created by dsymutil(1) and is similar to debug |
| 723 | link feature on ELF. |
| 724 | DSYM files are located in a subdirectory. Append DSYM_SUFFIX to the |
| 725 | executable name and the executable base name to get the DSYM file name. */ |
| 726 | #define DSYM_SUFFIX ".dSYM/Contents/Resources/DWARF/" |
| 727 | |
| 728 | /* Check if a dsym file exists for OBJFILE. If so, returns a bfd for it |
| 729 | and return *FILENAMEP with its original filename. |
| 730 | Return NULL if no valid dsym file is found (FILENAMEP is not used in |
| 731 | such case). */ |
| 732 | |
| 733 | static gdb_bfd_ref_ptr |
| 734 | macho_check_dsym (struct objfile *objfile, std::string *filenamep) |
| 735 | { |
| 736 | size_t name_len = strlen (objfile_name (objfile)); |
| 737 | size_t dsym_len = strlen (DSYM_SUFFIX); |
| 738 | const char *base_name = lbasename (objfile_name (objfile)); |
| 739 | size_t base_len = strlen (base_name); |
| 740 | char *dsym_filename = (char *) alloca (name_len + dsym_len + base_len + 1); |
| 741 | bfd_mach_o_load_command *main_uuid; |
| 742 | bfd_mach_o_load_command *dsym_uuid; |
| 743 | |
| 744 | strcpy (dsym_filename, objfile_name (objfile)); |
| 745 | strcpy (dsym_filename + name_len, DSYM_SUFFIX); |
| 746 | strcpy (dsym_filename + name_len + dsym_len, base_name); |
| 747 | |
| 748 | if (access (dsym_filename, R_OK) != 0) |
| 749 | return NULL; |
| 750 | |
| 751 | if (bfd_mach_o_lookup_command (objfile->obfd, |
| 752 | BFD_MACH_O_LC_UUID, &main_uuid) == 0) |
| 753 | { |
| 754 | warning (_("can't find UUID in %s"), objfile_name (objfile)); |
| 755 | return NULL; |
| 756 | } |
| 757 | gdb_bfd_ref_ptr dsym_bfd (gdb_bfd_openr (dsym_filename, gnutarget)); |
| 758 | if (dsym_bfd == NULL) |
| 759 | { |
| 760 | warning (_("can't open dsym file %s"), dsym_filename); |
| 761 | return NULL; |
| 762 | } |
| 763 | |
| 764 | if (!bfd_check_format (dsym_bfd.get (), bfd_object)) |
| 765 | { |
| 766 | warning (_("bad dsym file format: %s"), bfd_errmsg (bfd_get_error ())); |
| 767 | return NULL; |
| 768 | } |
| 769 | |
| 770 | if (bfd_mach_o_lookup_command (dsym_bfd.get (), |
| 771 | BFD_MACH_O_LC_UUID, &dsym_uuid) == 0) |
| 772 | { |
| 773 | warning (_("can't find UUID in %s"), dsym_filename); |
| 774 | return NULL; |
| 775 | } |
| 776 | if (memcmp (dsym_uuid->command.uuid.uuid, main_uuid->command.uuid.uuid, |
| 777 | sizeof (main_uuid->command.uuid.uuid))) |
| 778 | { |
| 779 | warning (_("dsym file UUID doesn't match the one in %s"), |
| 780 | objfile_name (objfile)); |
| 781 | return NULL; |
| 782 | } |
| 783 | *filenamep = std::string (dsym_filename); |
| 784 | return dsym_bfd; |
| 785 | } |
| 786 | |
| 787 | static void |
| 788 | macho_symfile_read (struct objfile *objfile, symfile_add_flags symfile_flags) |
| 789 | { |
| 790 | bfd *abfd = objfile->obfd; |
| 791 | long storage_needed; |
| 792 | std::vector<oso_el> oso_vector; |
| 793 | /* We have to hold on to the symbol table until the call to |
| 794 | macho_symfile_read_all_oso at the end of this function. */ |
| 795 | gdb::def_vector<asymbol *> symbol_table; |
| 796 | |
| 797 | /* Get symbols from the symbol table only if the file is an executable. |
| 798 | The symbol table of object files is not relocated and is expected to |
| 799 | be in the executable. */ |
| 800 | if (bfd_get_file_flags (abfd) & (EXEC_P | DYNAMIC)) |
| 801 | { |
| 802 | std::string dsym_filename; |
| 803 | |
| 804 | /* Process the normal symbol table first. */ |
| 805 | storage_needed = bfd_get_symtab_upper_bound (objfile->obfd); |
| 806 | if (storage_needed < 0) |
| 807 | error (_("Can't read symbols from %s: %s"), |
| 808 | bfd_get_filename (objfile->obfd), |
| 809 | bfd_errmsg (bfd_get_error ())); |
| 810 | |
| 811 | if (storage_needed > 0) |
| 812 | { |
| 813 | long symcount; |
| 814 | |
| 815 | symbol_table.resize (storage_needed / sizeof (asymbol *)); |
| 816 | |
| 817 | minimal_symbol_reader reader (objfile); |
| 818 | |
| 819 | symcount = bfd_canonicalize_symtab (objfile->obfd, |
| 820 | symbol_table.data ()); |
| 821 | |
| 822 | if (symcount < 0) |
| 823 | error (_("Can't read symbols from %s: %s"), |
| 824 | bfd_get_filename (objfile->obfd), |
| 825 | bfd_errmsg (bfd_get_error ())); |
| 826 | |
| 827 | macho_symtab_read (reader, objfile, symcount, symbol_table.data (), |
| 828 | &oso_vector); |
| 829 | |
| 830 | reader.install (); |
| 831 | } |
| 832 | |
| 833 | /* Try to read .eh_frame / .debug_frame. */ |
| 834 | /* First, locate these sections. We ignore the result status |
| 835 | as it only checks for debug info. */ |
| 836 | dwarf2_has_info (objfile, NULL); |
| 837 | dwarf2_build_frame_info (objfile); |
| 838 | |
| 839 | /* Check for DSYM file. */ |
| 840 | gdb_bfd_ref_ptr dsym_bfd (macho_check_dsym (objfile, &dsym_filename)); |
| 841 | if (dsym_bfd != NULL) |
| 842 | { |
| 843 | struct bfd_section *asect, *dsect; |
| 844 | |
| 845 | if (mach_o_debug_level > 0) |
| 846 | printf_unfiltered (_("dsym file found\n")); |
| 847 | |
| 848 | /* Set dsym section size. */ |
| 849 | for (asect = objfile->obfd->sections, dsect = dsym_bfd->sections; |
| 850 | asect && dsect; |
| 851 | asect = asect->next, dsect = dsect->next) |
| 852 | { |
| 853 | if (strcmp (asect->name, dsect->name) != 0) |
| 854 | break; |
| 855 | bfd_set_section_size (dsect, bfd_section_size (asect)); |
| 856 | } |
| 857 | |
| 858 | /* Add the dsym file as a separate file. */ |
| 859 | symbol_file_add_separate (dsym_bfd.get (), dsym_filename.c_str (), |
| 860 | symfile_flags, objfile); |
| 861 | |
| 862 | /* Don't try to read dwarf2 from main file or shared libraries. */ |
| 863 | return; |
| 864 | } |
| 865 | } |
| 866 | |
| 867 | if (dwarf2_has_info (objfile, NULL)) |
| 868 | { |
| 869 | /* DWARF 2 sections */ |
| 870 | dwarf2_build_psymtabs (objfile); |
| 871 | } |
| 872 | |
| 873 | /* Then the oso. */ |
| 874 | if (!oso_vector.empty ()) |
| 875 | macho_symfile_read_all_oso (&oso_vector, objfile, symfile_flags); |
| 876 | } |
| 877 | |
| 878 | static bfd_byte * |
| 879 | macho_symfile_relocate (struct objfile *objfile, asection *sectp, |
| 880 | bfd_byte *buf) |
| 881 | { |
| 882 | bfd *abfd = objfile->obfd; |
| 883 | |
| 884 | /* We're only interested in sections with relocation |
| 885 | information. */ |
| 886 | if ((sectp->flags & SEC_RELOC) == 0) |
| 887 | return NULL; |
| 888 | |
| 889 | if (mach_o_debug_level > 0) |
| 890 | printf_unfiltered (_("Relocate section '%s' of %s\n"), |
| 891 | sectp->name, objfile_name (objfile)); |
| 892 | |
| 893 | return bfd_simple_get_relocated_section_contents (abfd, sectp, buf, NULL); |
| 894 | } |
| 895 | |
| 896 | static void |
| 897 | macho_symfile_finish (struct objfile *objfile) |
| 898 | { |
| 899 | } |
| 900 | |
| 901 | static void |
| 902 | macho_symfile_offsets (struct objfile *objfile, |
| 903 | const section_addr_info &addrs) |
| 904 | { |
| 905 | unsigned int i; |
| 906 | struct obj_section *osect; |
| 907 | |
| 908 | /* Allocate section_offsets. */ |
| 909 | objfile->section_offsets.assign (bfd_count_sections (objfile->obfd), 0); |
| 910 | |
| 911 | /* This code is run when we first add the objfile with |
| 912 | symfile_add_with_addrs_or_offsets, when "addrs" not "offsets" are |
| 913 | passed in. The place in symfile.c where the addrs are applied |
| 914 | depends on the addrs having section names. But in the dyld code |
| 915 | we build an anonymous array of addrs, so that code is a no-op. |
| 916 | Because of that, we have to apply the addrs to the sections here. |
| 917 | N.B. if an objfile slides after we've already created it, then it |
| 918 | goes through objfile_relocate. */ |
| 919 | |
| 920 | for (i = 0; i < addrs.size (); i++) |
| 921 | { |
| 922 | ALL_OBJFILE_OSECTIONS (objfile, osect) |
| 923 | { |
| 924 | const char *bfd_sect_name = osect->the_bfd_section->name; |
| 925 | |
| 926 | if (bfd_sect_name == addrs[i].name) |
| 927 | { |
| 928 | obj_section_offset (osect) = addrs[i].addr; |
| 929 | break; |
| 930 | } |
| 931 | } |
| 932 | } |
| 933 | |
| 934 | objfile->sect_index_text = 0; |
| 935 | |
| 936 | ALL_OBJFILE_OSECTIONS (objfile, osect) |
| 937 | { |
| 938 | const char *bfd_sect_name = osect->the_bfd_section->name; |
| 939 | int sect_index = osect - objfile->sections;; |
| 940 | |
| 941 | if (startswith (bfd_sect_name, "LC_SEGMENT.")) |
| 942 | bfd_sect_name += 11; |
| 943 | if (strcmp (bfd_sect_name, "__TEXT") == 0 |
| 944 | || strcmp (bfd_sect_name, "__TEXT.__text") == 0) |
| 945 | objfile->sect_index_text = sect_index; |
| 946 | } |
| 947 | } |
| 948 | |
| 949 | static const struct sym_fns macho_sym_fns = { |
| 950 | macho_new_init, /* init anything gbl to entire symtab */ |
| 951 | macho_symfile_init, /* read initial info, setup for sym_read() */ |
| 952 | macho_symfile_read, /* read a symbol file into symtab */ |
| 953 | NULL, /* sym_read_psymbols */ |
| 954 | macho_symfile_finish, /* finished with file, cleanup */ |
| 955 | macho_symfile_offsets, /* xlate external to internal form */ |
| 956 | default_symfile_segments, /* Get segment information from a file. */ |
| 957 | NULL, |
| 958 | macho_symfile_relocate, /* Relocate a debug section. */ |
| 959 | NULL, /* sym_get_probes */ |
| 960 | &psym_functions |
| 961 | }; |
| 962 | |
| 963 | void _initialize_machoread (); |
| 964 | void |
| 965 | _initialize_machoread () |
| 966 | { |
| 967 | add_symtab_fns (bfd_target_mach_o_flavour, &macho_sym_fns); |
| 968 | |
| 969 | add_setshow_zuinteger_cmd ("mach-o", class_obscure, |
| 970 | &mach_o_debug_level, |
| 971 | _("Set if printing Mach-O symbols processing."), |
| 972 | _("Show if printing Mach-O symbols processing."), |
| 973 | NULL, NULL, NULL, |
| 974 | &setdebuglist, &showdebuglist); |
| 975 | } |