| 1 | /* Stabs in sections linking support. |
| 2 | Copyright (C) 1996-2014 Free Software Foundation, Inc. |
| 3 | Written by Ian Lance Taylor, Cygnus Support. |
| 4 | |
| 5 | This file is part of BFD, the Binary File Descriptor library. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 20 | MA 02110-1301, USA. */ |
| 21 | |
| 22 | |
| 23 | /* This file contains support for linking stabs in sections, as used |
| 24 | on COFF and ELF. */ |
| 25 | |
| 26 | #include "sysdep.h" |
| 27 | #include "bfd.h" |
| 28 | #include "libbfd.h" |
| 29 | #include "aout/stab_gnu.h" |
| 30 | #include "safe-ctype.h" |
| 31 | |
| 32 | /* Stabs entries use a 12 byte format: |
| 33 | 4 byte string table index |
| 34 | 1 byte stab type |
| 35 | 1 byte stab other field |
| 36 | 2 byte stab desc field |
| 37 | 4 byte stab value |
| 38 | FIXME: This will have to change for a 64 bit object format. |
| 39 | |
| 40 | The stabs symbols are divided into compilation units. For the |
| 41 | first entry in each unit, the type of 0, the value is the length of |
| 42 | the string table for this unit, and the desc field is the number of |
| 43 | stabs symbols for this unit. */ |
| 44 | |
| 45 | #define STRDXOFF 0 |
| 46 | #define TYPEOFF 4 |
| 47 | #define OTHEROFF 5 |
| 48 | #define DESCOFF 6 |
| 49 | #define VALOFF 8 |
| 50 | #define STABSIZE 12 |
| 51 | |
| 52 | /* A linked list of totals that we have found for a particular header |
| 53 | file. A total is a unique identifier for a particular BINCL...EINCL |
| 54 | sequence of STABs that can be used to identify duplicate sequences. |
| 55 | It consists of three fields, 'sum_chars' which is the sum of all the |
| 56 | STABS characters; 'num_chars' which is the number of these charactes |
| 57 | and 'symb' which is a buffer of all the symbols in the sequence. This |
| 58 | buffer is only checked as a last resort. */ |
| 59 | |
| 60 | struct stab_link_includes_totals |
| 61 | { |
| 62 | struct stab_link_includes_totals *next; |
| 63 | bfd_vma sum_chars; /* Accumulated sum of STABS characters. */ |
| 64 | bfd_vma num_chars; /* Number of STABS characters. */ |
| 65 | const char* symb; /* The STABS characters themselves. */ |
| 66 | }; |
| 67 | |
| 68 | /* An entry in the header file hash table. */ |
| 69 | |
| 70 | struct stab_link_includes_entry |
| 71 | { |
| 72 | struct bfd_hash_entry root; |
| 73 | /* List of totals we have found for this file. */ |
| 74 | struct stab_link_includes_totals *totals; |
| 75 | }; |
| 76 | |
| 77 | /* This structure is used to hold a list of N_BINCL symbols, some of |
| 78 | which might be converted into N_EXCL symbols. */ |
| 79 | |
| 80 | struct stab_excl_list |
| 81 | { |
| 82 | /* The next symbol to convert. */ |
| 83 | struct stab_excl_list *next; |
| 84 | /* The offset to this symbol in the section contents. */ |
| 85 | bfd_size_type offset; |
| 86 | /* The value to use for the symbol. */ |
| 87 | bfd_vma val; |
| 88 | /* The type of this symbol (N_BINCL or N_EXCL). */ |
| 89 | int type; |
| 90 | }; |
| 91 | |
| 92 | /* This structure is stored with each .stab section. */ |
| 93 | |
| 94 | struct stab_section_info |
| 95 | { |
| 96 | /* This is a linked list of N_BINCL symbols which should be |
| 97 | converted into N_EXCL symbols. */ |
| 98 | struct stab_excl_list *excls; |
| 99 | |
| 100 | /* This is used to map input stab offsets within their sections |
| 101 | to output stab offsets, to take into account stabs that have |
| 102 | been deleted. If it is NULL, the output offsets are the same |
| 103 | as the input offsets, because no stabs have been deleted from |
| 104 | this section. Otherwise the i'th entry is the number of |
| 105 | bytes of stabs that have been deleted prior to the i'th |
| 106 | stab. */ |
| 107 | bfd_size_type *cumulative_skips; |
| 108 | |
| 109 | /* This is an array of string indices. For each stab symbol, we |
| 110 | store the string index here. If a stab symbol should not be |
| 111 | included in the final output, the string index is -1. */ |
| 112 | bfd_size_type stridxs[1]; |
| 113 | }; |
| 114 | |
| 115 | \f |
| 116 | /* The function to create a new entry in the header file hash table. */ |
| 117 | |
| 118 | static struct bfd_hash_entry * |
| 119 | stab_link_includes_newfunc (struct bfd_hash_entry *entry, |
| 120 | struct bfd_hash_table *table, |
| 121 | const char *string) |
| 122 | { |
| 123 | struct stab_link_includes_entry *ret = |
| 124 | (struct stab_link_includes_entry *) entry; |
| 125 | |
| 126 | /* Allocate the structure if it has not already been allocated by a |
| 127 | subclass. */ |
| 128 | if (ret == NULL) |
| 129 | ret = (struct stab_link_includes_entry *) |
| 130 | bfd_hash_allocate (table, sizeof (struct stab_link_includes_entry)); |
| 131 | if (ret == NULL) |
| 132 | return NULL; |
| 133 | |
| 134 | /* Call the allocation method of the superclass. */ |
| 135 | ret = ((struct stab_link_includes_entry *) |
| 136 | bfd_hash_newfunc ((struct bfd_hash_entry *) ret, table, string)); |
| 137 | if (ret) |
| 138 | /* Set local fields. */ |
| 139 | ret->totals = NULL; |
| 140 | |
| 141 | return (struct bfd_hash_entry *) ret; |
| 142 | } |
| 143 | \f |
| 144 | /* This function is called for each input file from the add_symbols |
| 145 | pass of the linker. */ |
| 146 | |
| 147 | bfd_boolean |
| 148 | _bfd_link_section_stabs (bfd *abfd, |
| 149 | struct stab_info *sinfo, |
| 150 | asection *stabsec, |
| 151 | asection *stabstrsec, |
| 152 | void * *psecinfo, |
| 153 | bfd_size_type *pstring_offset) |
| 154 | { |
| 155 | bfd_boolean first; |
| 156 | bfd_size_type count, amt; |
| 157 | struct stab_section_info *secinfo; |
| 158 | bfd_byte *stabbuf = NULL; |
| 159 | bfd_byte *stabstrbuf = NULL; |
| 160 | bfd_byte *sym, *symend; |
| 161 | bfd_size_type stroff, next_stroff, skip; |
| 162 | bfd_size_type *pstridx; |
| 163 | |
| 164 | if (stabsec->size == 0 |
| 165 | || stabstrsec->size == 0) |
| 166 | /* This file does not contain stabs debugging information. */ |
| 167 | return TRUE; |
| 168 | |
| 169 | if (stabsec->size % STABSIZE != 0) |
| 170 | /* Something is wrong with the format of these stab symbols. |
| 171 | Don't try to optimize them. */ |
| 172 | return TRUE; |
| 173 | |
| 174 | if ((stabstrsec->flags & SEC_RELOC) != 0) |
| 175 | /* We shouldn't see relocations in the strings, and we aren't |
| 176 | prepared to handle them. */ |
| 177 | return TRUE; |
| 178 | |
| 179 | if (bfd_is_abs_section (stabsec->output_section) |
| 180 | || bfd_is_abs_section (stabstrsec->output_section)) |
| 181 | /* At least one of the sections is being discarded from the |
| 182 | link, so we should just ignore them. */ |
| 183 | return TRUE; |
| 184 | |
| 185 | first = FALSE; |
| 186 | |
| 187 | if (sinfo->stabstr == NULL) |
| 188 | { |
| 189 | flagword flags; |
| 190 | |
| 191 | /* Initialize the stabs information we need to keep track of. */ |
| 192 | first = TRUE; |
| 193 | sinfo->strings = _bfd_stringtab_init (); |
| 194 | if (sinfo->strings == NULL) |
| 195 | goto error_return; |
| 196 | /* Make sure the first byte is zero. */ |
| 197 | (void) _bfd_stringtab_add (sinfo->strings, "", TRUE, TRUE); |
| 198 | if (! bfd_hash_table_init (&sinfo->includes, |
| 199 | stab_link_includes_newfunc, |
| 200 | sizeof (struct stab_link_includes_entry))) |
| 201 | goto error_return; |
| 202 | flags = (SEC_HAS_CONTENTS | SEC_READONLY | SEC_DEBUGGING |
| 203 | | SEC_LINKER_CREATED); |
| 204 | sinfo->stabstr = bfd_make_section_anyway_with_flags (abfd, ".stabstr", |
| 205 | flags); |
| 206 | if (sinfo->stabstr == NULL) |
| 207 | goto error_return; |
| 208 | } |
| 209 | |
| 210 | /* Initialize the information we are going to store for this .stab |
| 211 | section. */ |
| 212 | count = stabsec->size / STABSIZE; |
| 213 | |
| 214 | amt = sizeof (struct stab_section_info); |
| 215 | amt += (count - 1) * sizeof (bfd_size_type); |
| 216 | *psecinfo = bfd_alloc (abfd, amt); |
| 217 | if (*psecinfo == NULL) |
| 218 | goto error_return; |
| 219 | |
| 220 | secinfo = (struct stab_section_info *) *psecinfo; |
| 221 | secinfo->excls = NULL; |
| 222 | stabsec->rawsize = stabsec->size; |
| 223 | secinfo->cumulative_skips = NULL; |
| 224 | memset (secinfo->stridxs, 0, (size_t) count * sizeof (bfd_size_type)); |
| 225 | |
| 226 | /* Read the stabs information from abfd. */ |
| 227 | if (!bfd_malloc_and_get_section (abfd, stabsec, &stabbuf) |
| 228 | || !bfd_malloc_and_get_section (abfd, stabstrsec, &stabstrbuf)) |
| 229 | goto error_return; |
| 230 | |
| 231 | /* Look through the stabs symbols, work out the new string indices, |
| 232 | and identify N_BINCL symbols which can be eliminated. */ |
| 233 | stroff = 0; |
| 234 | /* The stabs sections can be split when |
| 235 | -split-by-reloc/-split-by-file is used. We must keep track of |
| 236 | each stab section's place in the single concatenated string |
| 237 | table. */ |
| 238 | next_stroff = pstring_offset ? *pstring_offset : 0; |
| 239 | skip = 0; |
| 240 | |
| 241 | symend = stabbuf + stabsec->size; |
| 242 | for (sym = stabbuf, pstridx = secinfo->stridxs; |
| 243 | sym < symend; |
| 244 | sym += STABSIZE, ++pstridx) |
| 245 | { |
| 246 | bfd_size_type symstroff; |
| 247 | int type; |
| 248 | const char *string; |
| 249 | |
| 250 | if (*pstridx != 0) |
| 251 | /* This symbol has already been handled by an N_BINCL pass. */ |
| 252 | continue; |
| 253 | |
| 254 | type = sym[TYPEOFF]; |
| 255 | |
| 256 | if (type == 0) |
| 257 | { |
| 258 | /* Special type 0 stabs indicate the offset to the next |
| 259 | string table. We only copy the very first one. */ |
| 260 | stroff = next_stroff; |
| 261 | next_stroff += bfd_get_32 (abfd, sym + 8); |
| 262 | if (pstring_offset) |
| 263 | *pstring_offset = next_stroff; |
| 264 | if (! first) |
| 265 | { |
| 266 | *pstridx = (bfd_size_type) -1; |
| 267 | ++skip; |
| 268 | continue; |
| 269 | } |
| 270 | first = FALSE; |
| 271 | } |
| 272 | |
| 273 | /* Store the string in the hash table, and record the index. */ |
| 274 | symstroff = stroff + bfd_get_32 (abfd, sym + STRDXOFF); |
| 275 | if (symstroff >= stabstrsec->size) |
| 276 | { |
| 277 | (*_bfd_error_handler) |
| 278 | (_("%B(%A+0x%lx): Stabs entry has invalid string index."), |
| 279 | abfd, stabsec, (long) (sym - stabbuf)); |
| 280 | bfd_set_error (bfd_error_bad_value); |
| 281 | goto error_return; |
| 282 | } |
| 283 | string = (char *) stabstrbuf + symstroff; |
| 284 | *pstridx = _bfd_stringtab_add (sinfo->strings, string, TRUE, TRUE); |
| 285 | |
| 286 | /* An N_BINCL symbol indicates the start of the stabs entries |
| 287 | for a header file. We need to scan ahead to the next N_EINCL |
| 288 | symbol, ignoring nesting, adding up all the characters in the |
| 289 | symbol names, not including the file numbers in types (the |
| 290 | first number after an open parenthesis). */ |
| 291 | if (type == (int) N_BINCL) |
| 292 | { |
| 293 | bfd_vma sum_chars; |
| 294 | bfd_vma num_chars; |
| 295 | bfd_vma buf_len = 0; |
| 296 | char * symb; |
| 297 | char * symb_rover; |
| 298 | int nest; |
| 299 | bfd_byte * incl_sym; |
| 300 | struct stab_link_includes_entry * incl_entry; |
| 301 | struct stab_link_includes_totals * t; |
| 302 | struct stab_excl_list * ne; |
| 303 | |
| 304 | symb = symb_rover = NULL; |
| 305 | sum_chars = num_chars = 0; |
| 306 | nest = 0; |
| 307 | |
| 308 | for (incl_sym = sym + STABSIZE; |
| 309 | incl_sym < symend; |
| 310 | incl_sym += STABSIZE) |
| 311 | { |
| 312 | int incl_type; |
| 313 | |
| 314 | incl_type = incl_sym[TYPEOFF]; |
| 315 | if (incl_type == 0) |
| 316 | break; |
| 317 | else if (incl_type == (int) N_EXCL) |
| 318 | continue; |
| 319 | else if (incl_type == (int) N_EINCL) |
| 320 | { |
| 321 | if (nest == 0) |
| 322 | break; |
| 323 | --nest; |
| 324 | } |
| 325 | else if (incl_type == (int) N_BINCL) |
| 326 | ++nest; |
| 327 | else if (nest == 0) |
| 328 | { |
| 329 | const char *str; |
| 330 | |
| 331 | str = ((char *) stabstrbuf |
| 332 | + stroff |
| 333 | + bfd_get_32 (abfd, incl_sym + STRDXOFF)); |
| 334 | for (; *str != '\0'; str++) |
| 335 | { |
| 336 | if (num_chars >= buf_len) |
| 337 | { |
| 338 | buf_len += 32 * 1024; |
| 339 | symb = (char *) bfd_realloc_or_free (symb, buf_len); |
| 340 | if (symb == NULL) |
| 341 | goto error_return; |
| 342 | symb_rover = symb + num_chars; |
| 343 | } |
| 344 | * symb_rover ++ = * str; |
| 345 | sum_chars += *str; |
| 346 | num_chars ++; |
| 347 | if (*str == '(') |
| 348 | { |
| 349 | /* Skip the file number. */ |
| 350 | ++str; |
| 351 | while (ISDIGIT (*str)) |
| 352 | ++str; |
| 353 | --str; |
| 354 | } |
| 355 | } |
| 356 | } |
| 357 | } |
| 358 | |
| 359 | BFD_ASSERT (num_chars == (bfd_vma) (symb_rover - symb)); |
| 360 | |
| 361 | /* If we have already included a header file with the same |
| 362 | value, then replaced this one with an N_EXCL symbol. */ |
| 363 | incl_entry = (struct stab_link_includes_entry * ) |
| 364 | bfd_hash_lookup (&sinfo->includes, string, TRUE, TRUE); |
| 365 | if (incl_entry == NULL) |
| 366 | goto error_return; |
| 367 | |
| 368 | for (t = incl_entry->totals; t != NULL; t = t->next) |
| 369 | if (t->sum_chars == sum_chars |
| 370 | && t->num_chars == num_chars |
| 371 | && memcmp (t->symb, symb, num_chars) == 0) |
| 372 | break; |
| 373 | |
| 374 | /* Record this symbol, so that we can set the value |
| 375 | correctly. */ |
| 376 | amt = sizeof *ne; |
| 377 | ne = (struct stab_excl_list *) bfd_alloc (abfd, amt); |
| 378 | if (ne == NULL) |
| 379 | goto error_return; |
| 380 | ne->offset = sym - stabbuf; |
| 381 | ne->val = sum_chars; |
| 382 | ne->type = (int) N_BINCL; |
| 383 | ne->next = secinfo->excls; |
| 384 | secinfo->excls = ne; |
| 385 | |
| 386 | if (t == NULL) |
| 387 | { |
| 388 | /* This is the first time we have seen this header file |
| 389 | with this set of stabs strings. */ |
| 390 | t = (struct stab_link_includes_totals *) |
| 391 | bfd_hash_allocate (&sinfo->includes, sizeof *t); |
| 392 | if (t == NULL) |
| 393 | goto error_return; |
| 394 | t->sum_chars = sum_chars; |
| 395 | t->num_chars = num_chars; |
| 396 | /* Trim data down. */ |
| 397 | t->symb = symb = (char *) bfd_realloc_or_free (symb, num_chars); |
| 398 | t->next = incl_entry->totals; |
| 399 | incl_entry->totals = t; |
| 400 | } |
| 401 | else |
| 402 | { |
| 403 | bfd_size_type *incl_pstridx; |
| 404 | |
| 405 | /* We have seen this header file before. Tell the final |
| 406 | pass to change the type to N_EXCL. */ |
| 407 | ne->type = (int) N_EXCL; |
| 408 | |
| 409 | /* Free off superfluous symbols. */ |
| 410 | free (symb); |
| 411 | |
| 412 | /* Mark the skipped symbols. */ |
| 413 | |
| 414 | nest = 0; |
| 415 | for (incl_sym = sym + STABSIZE, incl_pstridx = pstridx + 1; |
| 416 | incl_sym < symend; |
| 417 | incl_sym += STABSIZE, ++incl_pstridx) |
| 418 | { |
| 419 | int incl_type; |
| 420 | |
| 421 | incl_type = incl_sym[TYPEOFF]; |
| 422 | |
| 423 | if (incl_type == (int) N_EINCL) |
| 424 | { |
| 425 | if (nest == 0) |
| 426 | { |
| 427 | *incl_pstridx = (bfd_size_type) -1; |
| 428 | ++skip; |
| 429 | break; |
| 430 | } |
| 431 | --nest; |
| 432 | } |
| 433 | else if (incl_type == (int) N_BINCL) |
| 434 | ++nest; |
| 435 | else if (incl_type == (int) N_EXCL) |
| 436 | /* Keep existing exclusion marks. */ |
| 437 | continue; |
| 438 | else if (nest == 0) |
| 439 | { |
| 440 | *incl_pstridx = (bfd_size_type) -1; |
| 441 | ++skip; |
| 442 | } |
| 443 | } |
| 444 | } |
| 445 | } |
| 446 | } |
| 447 | |
| 448 | free (stabbuf); |
| 449 | stabbuf = NULL; |
| 450 | free (stabstrbuf); |
| 451 | stabstrbuf = NULL; |
| 452 | |
| 453 | /* We need to set the section sizes such that the linker will |
| 454 | compute the output section sizes correctly. We set the .stab |
| 455 | size to not include the entries we don't want. We set |
| 456 | SEC_EXCLUDE for the .stabstr section, so that it will be dropped |
| 457 | from the link. We record the size of the strtab in the first |
| 458 | .stabstr section we saw, and make sure we don't set SEC_EXCLUDE |
| 459 | for that section. */ |
| 460 | stabsec->size = (count - skip) * STABSIZE; |
| 461 | if (stabsec->size == 0) |
| 462 | stabsec->flags |= SEC_EXCLUDE | SEC_KEEP; |
| 463 | stabstrsec->flags |= SEC_EXCLUDE | SEC_KEEP; |
| 464 | sinfo->stabstr->size = _bfd_stringtab_size (sinfo->strings); |
| 465 | |
| 466 | /* Calculate the `cumulative_skips' array now that stabs have been |
| 467 | deleted for this section. */ |
| 468 | |
| 469 | if (skip != 0) |
| 470 | { |
| 471 | bfd_size_type i, offset; |
| 472 | bfd_size_type *pskips; |
| 473 | |
| 474 | amt = count * sizeof (bfd_size_type); |
| 475 | secinfo->cumulative_skips = (bfd_size_type *) bfd_alloc (abfd, amt); |
| 476 | if (secinfo->cumulative_skips == NULL) |
| 477 | goto error_return; |
| 478 | |
| 479 | pskips = secinfo->cumulative_skips; |
| 480 | pstridx = secinfo->stridxs; |
| 481 | offset = 0; |
| 482 | |
| 483 | for (i = 0; i < count; i++, pskips++, pstridx++) |
| 484 | { |
| 485 | *pskips = offset; |
| 486 | if (*pstridx == (bfd_size_type) -1) |
| 487 | offset += STABSIZE; |
| 488 | } |
| 489 | |
| 490 | BFD_ASSERT (offset != 0); |
| 491 | } |
| 492 | |
| 493 | return TRUE; |
| 494 | |
| 495 | error_return: |
| 496 | if (stabbuf != NULL) |
| 497 | free (stabbuf); |
| 498 | if (stabstrbuf != NULL) |
| 499 | free (stabstrbuf); |
| 500 | return FALSE; |
| 501 | } |
| 502 | \f |
| 503 | /* This function is called for each input file before the stab |
| 504 | section is relocated. It discards stab entries for discarded |
| 505 | functions and variables. The function returns TRUE iff |
| 506 | any entries have been deleted. |
| 507 | */ |
| 508 | |
| 509 | bfd_boolean |
| 510 | _bfd_discard_section_stabs (bfd *abfd, |
| 511 | asection *stabsec, |
| 512 | void * psecinfo, |
| 513 | bfd_boolean (*reloc_symbol_deleted_p) (bfd_vma, void *), |
| 514 | void * cookie) |
| 515 | { |
| 516 | bfd_size_type count, amt; |
| 517 | struct stab_section_info *secinfo; |
| 518 | bfd_byte *stabbuf = NULL; |
| 519 | bfd_byte *sym, *symend; |
| 520 | bfd_size_type skip; |
| 521 | bfd_size_type *pstridx; |
| 522 | int deleting; |
| 523 | |
| 524 | if (stabsec->size == 0) |
| 525 | /* This file does not contain stabs debugging information. */ |
| 526 | return FALSE; |
| 527 | |
| 528 | if (stabsec->size % STABSIZE != 0) |
| 529 | /* Something is wrong with the format of these stab symbols. |
| 530 | Don't try to optimize them. */ |
| 531 | return FALSE; |
| 532 | |
| 533 | if ((stabsec->output_section != NULL |
| 534 | && bfd_is_abs_section (stabsec->output_section))) |
| 535 | /* At least one of the sections is being discarded from the |
| 536 | link, so we should just ignore them. */ |
| 537 | return FALSE; |
| 538 | |
| 539 | /* We should have initialized our data in _bfd_link_stab_sections. |
| 540 | If there was some bizarre error reading the string sections, though, |
| 541 | we might not have. Bail rather than asserting. */ |
| 542 | if (psecinfo == NULL) |
| 543 | return FALSE; |
| 544 | |
| 545 | count = stabsec->rawsize / STABSIZE; |
| 546 | secinfo = (struct stab_section_info *) psecinfo; |
| 547 | |
| 548 | /* Read the stabs information from abfd. */ |
| 549 | if (!bfd_malloc_and_get_section (abfd, stabsec, &stabbuf)) |
| 550 | goto error_return; |
| 551 | |
| 552 | /* Look through the stabs symbols and discard any information for |
| 553 | discarded functions. */ |
| 554 | skip = 0; |
| 555 | deleting = -1; |
| 556 | |
| 557 | symend = stabbuf + stabsec->rawsize; |
| 558 | for (sym = stabbuf, pstridx = secinfo->stridxs; |
| 559 | sym < symend; |
| 560 | sym += STABSIZE, ++pstridx) |
| 561 | { |
| 562 | int type; |
| 563 | |
| 564 | if (*pstridx == (bfd_size_type) -1) |
| 565 | /* This stab was deleted in a previous pass. */ |
| 566 | continue; |
| 567 | |
| 568 | type = sym[TYPEOFF]; |
| 569 | |
| 570 | if (type == (int) N_FUN) |
| 571 | { |
| 572 | int strx = bfd_get_32 (abfd, sym + STRDXOFF); |
| 573 | |
| 574 | if (strx == 0) |
| 575 | { |
| 576 | if (deleting) |
| 577 | { |
| 578 | skip++; |
| 579 | *pstridx = -1; |
| 580 | } |
| 581 | deleting = -1; |
| 582 | continue; |
| 583 | } |
| 584 | deleting = 0; |
| 585 | if ((*reloc_symbol_deleted_p) (sym + VALOFF - stabbuf, cookie)) |
| 586 | deleting = 1; |
| 587 | } |
| 588 | |
| 589 | if (deleting == 1) |
| 590 | { |
| 591 | *pstridx = -1; |
| 592 | skip++; |
| 593 | } |
| 594 | else if (deleting == -1) |
| 595 | { |
| 596 | /* Outside of a function. Check for deleted variables. */ |
| 597 | if (type == (int) N_STSYM || type == (int) N_LCSYM) |
| 598 | if ((*reloc_symbol_deleted_p) (sym + VALOFF - stabbuf, cookie)) |
| 599 | { |
| 600 | *pstridx = -1; |
| 601 | skip ++; |
| 602 | } |
| 603 | /* We should also check for N_GSYM entries which reference a |
| 604 | deleted global, but those are less harmful to debuggers |
| 605 | and would require parsing the stab strings. */ |
| 606 | } |
| 607 | } |
| 608 | |
| 609 | free (stabbuf); |
| 610 | stabbuf = NULL; |
| 611 | |
| 612 | /* Shrink the stabsec as needed. */ |
| 613 | stabsec->size -= skip * STABSIZE; |
| 614 | if (stabsec->size == 0) |
| 615 | stabsec->flags |= SEC_EXCLUDE | SEC_KEEP; |
| 616 | |
| 617 | /* Recalculate the `cumulative_skips' array now that stabs have been |
| 618 | deleted for this section. */ |
| 619 | |
| 620 | if (skip != 0) |
| 621 | { |
| 622 | bfd_size_type i, offset; |
| 623 | bfd_size_type *pskips; |
| 624 | |
| 625 | if (secinfo->cumulative_skips == NULL) |
| 626 | { |
| 627 | amt = count * sizeof (bfd_size_type); |
| 628 | secinfo->cumulative_skips = (bfd_size_type *) bfd_alloc (abfd, amt); |
| 629 | if (secinfo->cumulative_skips == NULL) |
| 630 | goto error_return; |
| 631 | } |
| 632 | |
| 633 | pskips = secinfo->cumulative_skips; |
| 634 | pstridx = secinfo->stridxs; |
| 635 | offset = 0; |
| 636 | |
| 637 | for (i = 0; i < count; i++, pskips++, pstridx++) |
| 638 | { |
| 639 | *pskips = offset; |
| 640 | if (*pstridx == (bfd_size_type) -1) |
| 641 | offset += STABSIZE; |
| 642 | } |
| 643 | |
| 644 | BFD_ASSERT (offset != 0); |
| 645 | } |
| 646 | |
| 647 | return skip > 0; |
| 648 | |
| 649 | error_return: |
| 650 | if (stabbuf != NULL) |
| 651 | free (stabbuf); |
| 652 | return FALSE; |
| 653 | } |
| 654 | |
| 655 | /* Write out the stab section. This is called with the relocated |
| 656 | contents. */ |
| 657 | |
| 658 | bfd_boolean |
| 659 | _bfd_write_section_stabs (bfd *output_bfd, |
| 660 | struct stab_info *sinfo, |
| 661 | asection *stabsec, |
| 662 | void * *psecinfo, |
| 663 | bfd_byte *contents) |
| 664 | { |
| 665 | struct stab_section_info *secinfo; |
| 666 | struct stab_excl_list *e; |
| 667 | bfd_byte *sym, *tosym, *symend; |
| 668 | bfd_size_type *pstridx; |
| 669 | |
| 670 | secinfo = (struct stab_section_info *) *psecinfo; |
| 671 | |
| 672 | if (secinfo == NULL) |
| 673 | return bfd_set_section_contents (output_bfd, stabsec->output_section, |
| 674 | contents, stabsec->output_offset, |
| 675 | stabsec->size); |
| 676 | |
| 677 | /* Handle each N_BINCL entry. */ |
| 678 | for (e = secinfo->excls; e != NULL; e = e->next) |
| 679 | { |
| 680 | bfd_byte *excl_sym; |
| 681 | |
| 682 | BFD_ASSERT (e->offset < stabsec->rawsize); |
| 683 | excl_sym = contents + e->offset; |
| 684 | bfd_put_32 (output_bfd, e->val, excl_sym + VALOFF); |
| 685 | excl_sym[TYPEOFF] = e->type; |
| 686 | } |
| 687 | |
| 688 | /* Copy over all the stabs symbols, omitting the ones we don't want, |
| 689 | and correcting the string indices for those we do want. */ |
| 690 | tosym = contents; |
| 691 | symend = contents + stabsec->rawsize; |
| 692 | for (sym = contents, pstridx = secinfo->stridxs; |
| 693 | sym < symend; |
| 694 | sym += STABSIZE, ++pstridx) |
| 695 | { |
| 696 | if (*pstridx != (bfd_size_type) -1) |
| 697 | { |
| 698 | if (tosym != sym) |
| 699 | memcpy (tosym, sym, STABSIZE); |
| 700 | bfd_put_32 (output_bfd, *pstridx, tosym + STRDXOFF); |
| 701 | |
| 702 | if (sym[TYPEOFF] == 0) |
| 703 | { |
| 704 | /* This is the header symbol for the stabs section. We |
| 705 | don't really need one, since we have merged all the |
| 706 | input stabs sections into one, but we generate one |
| 707 | for the benefit of readers which expect to see one. */ |
| 708 | BFD_ASSERT (sym == contents); |
| 709 | bfd_put_32 (output_bfd, _bfd_stringtab_size (sinfo->strings), |
| 710 | tosym + VALOFF); |
| 711 | bfd_put_16 (output_bfd, |
| 712 | stabsec->output_section->size / STABSIZE - 1, |
| 713 | tosym + DESCOFF); |
| 714 | } |
| 715 | |
| 716 | tosym += STABSIZE; |
| 717 | } |
| 718 | } |
| 719 | |
| 720 | BFD_ASSERT ((bfd_size_type) (tosym - contents) == stabsec->size); |
| 721 | |
| 722 | return bfd_set_section_contents (output_bfd, stabsec->output_section, |
| 723 | contents, (file_ptr) stabsec->output_offset, |
| 724 | stabsec->size); |
| 725 | } |
| 726 | |
| 727 | /* Write out the .stabstr section. */ |
| 728 | |
| 729 | bfd_boolean |
| 730 | _bfd_write_stab_strings (bfd *output_bfd, struct stab_info *sinfo) |
| 731 | { |
| 732 | if (bfd_is_abs_section (sinfo->stabstr->output_section)) |
| 733 | /* The section was discarded from the link. */ |
| 734 | return TRUE; |
| 735 | |
| 736 | BFD_ASSERT ((sinfo->stabstr->output_offset |
| 737 | + _bfd_stringtab_size (sinfo->strings)) |
| 738 | <= sinfo->stabstr->output_section->size); |
| 739 | |
| 740 | if (bfd_seek (output_bfd, |
| 741 | (file_ptr) (sinfo->stabstr->output_section->filepos |
| 742 | + sinfo->stabstr->output_offset), |
| 743 | SEEK_SET) != 0) |
| 744 | return FALSE; |
| 745 | |
| 746 | if (! _bfd_stringtab_emit (output_bfd, sinfo->strings)) |
| 747 | return FALSE; |
| 748 | |
| 749 | /* We no longer need the stabs information. */ |
| 750 | _bfd_stringtab_free (sinfo->strings); |
| 751 | bfd_hash_table_free (&sinfo->includes); |
| 752 | |
| 753 | return TRUE; |
| 754 | } |
| 755 | |
| 756 | /* Adjust an address in the .stab section. Given OFFSET within |
| 757 | STABSEC, this returns the new offset in the adjusted stab section, |
| 758 | or -1 if the address refers to a stab which has been removed. */ |
| 759 | |
| 760 | bfd_vma |
| 761 | _bfd_stab_section_offset (asection *stabsec, |
| 762 | void * psecinfo, |
| 763 | bfd_vma offset) |
| 764 | { |
| 765 | struct stab_section_info *secinfo; |
| 766 | |
| 767 | secinfo = (struct stab_section_info *) psecinfo; |
| 768 | |
| 769 | if (secinfo == NULL) |
| 770 | return offset; |
| 771 | |
| 772 | if (offset >= stabsec->rawsize) |
| 773 | return offset - stabsec->rawsize + stabsec->size; |
| 774 | |
| 775 | if (secinfo->cumulative_skips) |
| 776 | { |
| 777 | bfd_vma i; |
| 778 | |
| 779 | i = offset / STABSIZE; |
| 780 | |
| 781 | if (secinfo->stridxs [i] == (bfd_size_type) -1) |
| 782 | return (bfd_vma) -1; |
| 783 | |
| 784 | return offset - secinfo->cumulative_skips [i]; |
| 785 | } |
| 786 | |
| 787 | return offset; |
| 788 | } |