Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1 | /* Combine stripped files with separate symbols and debug information. |
| 2 | Copyright (C) 2007 Red Hat, Inc. |
| 3 | This file is part of Red Hat elfutils. |
| 4 | Written by Roland McGrath <roland@redhat.com>, 2007. |
| 5 | |
| 6 | Red Hat elfutils is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by the |
| 8 | Free Software Foundation; version 2 of the License. |
| 9 | |
| 10 | Red Hat elfutils is distributed in the hope that it will be useful, but |
| 11 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License along |
| 16 | with Red Hat elfutils; if not, write to the Free Software Foundation, |
| 17 | Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. |
| 18 | |
| 19 | Red Hat elfutils is an included package of the Open Invention Network. |
| 20 | An included package of the Open Invention Network is a package for which |
| 21 | Open Invention Network licensees cross-license their patents. No patent |
| 22 | license is granted, either expressly or impliedly, by designation as an |
| 23 | included package. Should you wish to participate in the Open Invention |
| 24 | Network licensing program, please visit www.openinventionnetwork.com |
| 25 | <http://www.openinventionnetwork.com>. */ |
| 26 | |
| 27 | /* TODO: |
| 28 | |
| 29 | * SHX_XINDEX |
| 30 | |
| 31 | * prelink vs .debug_* linked addresses |
| 32 | |
| 33 | * merge many inputs? -> ET_EXEC with union phdrs + new phdrs for ET_REL mods |
| 34 | ** with applied relocs to ET_REL mods, use data modified by dwfl |
| 35 | *** still must apply relocs to SHF_ALLOC |
| 36 | ** useless unless merge all symtabs and dwarf sections |
| 37 | |
| 38 | */ |
| 39 | |
| 40 | #ifdef HAVE_CONFIG_H |
| 41 | # include <config.h> |
| 42 | #endif |
| 43 | |
| 44 | #include <argp.h> |
| 45 | #include <assert.h> |
| 46 | #include <errno.h> |
| 47 | #include <error.h> |
| 48 | #include <fcntl.h> |
| 49 | #include <fnmatch.h> |
| 50 | #include <libintl.h> |
| 51 | #include <locale.h> |
| 52 | #include <mcheck.h> |
| 53 | #include <stdbool.h> |
| 54 | #include <stdio.h> |
| 55 | #include <stdio_ext.h> |
| 56 | #include <stdlib.h> |
| 57 | #include <string.h> |
| 58 | #include <unistd.h> |
| 59 | |
| 60 | #include <gelf.h> |
| 61 | #include <libebl.h> |
| 62 | #include <libdwfl.h> |
| 63 | #include "system.h" |
| 64 | |
| 65 | #ifndef _ |
| 66 | # define _(str) gettext (str) |
| 67 | #endif |
| 68 | |
| 69 | /* Name and version of program. */ |
| 70 | static void print_version (FILE *stream, struct argp_state *state); |
| 71 | void (*argp_program_version_hook) (FILE *, struct argp_state *) |
| 72 | = print_version; |
| 73 | |
| 74 | /* Bug report address. */ |
| 75 | const char *argp_program_bug_address = PACKAGE_BUGREPORT; |
| 76 | |
| 77 | /* Definitions of arguments for argp functions. */ |
| 78 | static const struct argp_option options[] = |
| 79 | { |
| 80 | /* Group 2 will follow group 1 from dwfl_standard_argp. */ |
| 81 | { "match-file-names", 'f', NULL, 0, |
| 82 | N_("Match MODULE against file names, not module names"), 2 }, |
| 83 | { "ignore-missing", 'i', NULL, 0, N_("Silently skip unfindable files"), 0 }, |
| 84 | |
| 85 | { NULL, 0, NULL, 0, N_("Output options:"), 0 }, |
| 86 | { "output", 'o', "FILE", 0, N_("Place output into FILE"), 0 }, |
| 87 | { "output-directory", 'd', "DIRECTORY", |
| 88 | 0, N_("Create multiple output files under DIRECTORY"), 0 }, |
| 89 | { "module-names", 'm', NULL, 0, N_("Use module rather than file names"), 0 }, |
| 90 | { "all", 'a', NULL, 0, |
| 91 | N_("Create output for modules that have no separate debug information"), |
| 92 | 0 }, |
| 93 | { NULL, 0, NULL, 0, NULL, 0 } |
| 94 | }; |
| 95 | |
| 96 | struct arg_info |
| 97 | { |
| 98 | const char *output_file; |
| 99 | const char *output_dir; |
| 100 | Dwfl *dwfl; |
| 101 | char **args; |
| 102 | bool all; |
| 103 | bool ignore; |
| 104 | bool modnames; |
| 105 | bool match_files; |
| 106 | }; |
| 107 | |
| 108 | /* Handle program arguments. */ |
| 109 | static error_t |
| 110 | parse_opt (int key, char *arg, struct argp_state *state) |
| 111 | { |
| 112 | struct arg_info *info = state->input; |
| 113 | |
| 114 | switch (key) |
| 115 | { |
| 116 | case ARGP_KEY_INIT: |
| 117 | state->child_inputs[0] = &info->dwfl; |
| 118 | break; |
| 119 | |
| 120 | case 'o': |
| 121 | if (info->output_file != NULL) |
| 122 | { |
| 123 | argp_error (state, _("-o option specified twice")); |
| 124 | return EINVAL; |
| 125 | } |
| 126 | info->output_file = arg; |
| 127 | break; |
| 128 | |
| 129 | case 'd': |
| 130 | if (info->output_dir != NULL) |
| 131 | { |
| 132 | argp_error (state, _("-d option specified twice")); |
| 133 | return EINVAL; |
| 134 | } |
| 135 | info->output_dir = arg; |
| 136 | break; |
| 137 | |
| 138 | case 'm': |
| 139 | info->modnames = true; |
| 140 | break; |
| 141 | case 'f': |
| 142 | info->match_files = true; |
| 143 | break; |
| 144 | case 'a': |
| 145 | info->all = true; |
| 146 | break; |
| 147 | case 'i': |
| 148 | info->ignore = true; |
| 149 | break; |
| 150 | |
| 151 | case ARGP_KEY_ARGS: |
| 152 | case ARGP_KEY_NO_ARGS: |
| 153 | /* We "consume" all the arguments here. */ |
| 154 | info->args = &state->argv[state->next]; |
| 155 | |
| 156 | if (info->output_file != NULL && info->output_dir != NULL) |
| 157 | { |
| 158 | argp_error (state, _("only one of -o or -d allowed")); |
| 159 | return EINVAL; |
| 160 | } |
| 161 | |
| 162 | if (info->output_dir != NULL) |
| 163 | { |
| 164 | struct stat64 st; |
| 165 | error_t fail = 0; |
| 166 | if (stat64 (info->output_dir, &st) < 0) |
| 167 | fail = errno; |
| 168 | else if (!S_ISDIR (st.st_mode)) |
| 169 | fail = ENOTDIR; |
| 170 | if (fail) |
| 171 | { |
| 172 | argp_failure (state, EXIT_FAILURE, fail, |
| 173 | _("output directory '%s'"), info->output_dir); |
| 174 | return fail; |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | if (info->dwfl == NULL) |
| 179 | { |
| 180 | if (state->next + 2 != state->argc) |
| 181 | { |
| 182 | argp_error (state, _("exactly two file arguments are required")); |
| 183 | return EINVAL; |
| 184 | } |
| 185 | |
| 186 | if (info->ignore || info->all || info->modnames) |
| 187 | { |
| 188 | argp_error (state, _("\ |
| 189 | -m, -a, and -i options not allowed with explicit files")); |
| 190 | return EINVAL; |
| 191 | } |
| 192 | |
| 193 | /* Bail out immediately to prevent dwfl_standard_argp's parser |
| 194 | from defaulting to "-e a.out". */ |
| 195 | return ENOSYS; |
| 196 | } |
| 197 | else if (info->output_file == NULL && info->output_dir == NULL) |
| 198 | { |
| 199 | argp_error (state, |
| 200 | _("-o or -d is required when using implicit files")); |
| 201 | return EINVAL; |
| 202 | } |
| 203 | break; |
| 204 | |
| 205 | default: |
| 206 | return ARGP_ERR_UNKNOWN; |
| 207 | } |
| 208 | return 0; |
| 209 | } |
| 210 | |
| 211 | /* Print the version information. */ |
| 212 | static void |
| 213 | print_version (FILE *stream, struct argp_state *state __attribute__ ((unused))) |
| 214 | { |
Ulrich Drepper | b024386 | 2007-06-06 00:09:36 +0000 | [diff] [blame^] | 215 | fprintf (stream, "unstrip (%s) %s\n", PACKAGE_NAME, PACKAGE_VERSION); |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 216 | fprintf (stream, _("\ |
| 217 | Copyright (C) %s Red Hat, Inc.\n\ |
| 218 | This is free software; see the source for copying conditions. There is NO\n\ |
| 219 | warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\ |
| 220 | "), "2007"); |
| 221 | fprintf (stream, gettext ("Written by %s.\n"), "Roland McGrath"); |
| 222 | } |
| 223 | |
| 224 | #define ELF_CHECK(call, msg) \ |
| 225 | do \ |
| 226 | { \ |
| 227 | if (!(call)) \ |
| 228 | error (EXIT_FAILURE, 0, msg, elf_errmsg (-1)); \ |
| 229 | } while (0) |
| 230 | |
| 231 | /* Copy INELF to newly-created OUTELF, exit via error for any problems. */ |
| 232 | static void |
| 233 | copy_elf (Elf *outelf, Elf *inelf) |
| 234 | { |
| 235 | ELF_CHECK (gelf_newehdr (outelf, gelf_getclass (inelf)), |
| 236 | _("cannot create ELF header: %s")); |
| 237 | |
| 238 | GElf_Ehdr ehdr_mem; |
| 239 | GElf_Ehdr *ehdr = gelf_getehdr (inelf, &ehdr_mem); |
| 240 | ELF_CHECK (gelf_update_ehdr (outelf, ehdr), |
| 241 | _("cannot copy ELF header: %s")); |
| 242 | |
| 243 | if (ehdr->e_phnum > 0) |
| 244 | { |
| 245 | ELF_CHECK (gelf_newphdr (outelf, ehdr->e_phnum), |
| 246 | _("cannot create program headers: %s")); |
| 247 | |
| 248 | GElf_Phdr phdr_mem; |
| 249 | for (uint_fast16_t i = 0; i < ehdr->e_phnum; ++i) |
| 250 | ELF_CHECK (gelf_update_phdr (outelf, i, |
| 251 | gelf_getphdr (inelf, i, &phdr_mem)), |
| 252 | _("cannot copy program header: %s")); |
| 253 | } |
| 254 | |
| 255 | Elf_Scn *scn = NULL; |
| 256 | while ((scn = elf_nextscn (inelf, scn)) != NULL) |
| 257 | { |
| 258 | Elf_Scn *newscn = elf_newscn (outelf); |
| 259 | |
| 260 | GElf_Shdr shdr_mem; |
| 261 | ELF_CHECK (gelf_update_shdr (newscn, gelf_getshdr (scn, &shdr_mem)), |
| 262 | _("cannot copy section header: %s")); |
| 263 | |
| 264 | Elf_Data *data = elf_getdata (scn, NULL); |
| 265 | ELF_CHECK (data != NULL, _("cannot get section data: %s")); |
| 266 | Elf_Data *newdata = elf_newdata (newscn); |
| 267 | ELF_CHECK (newdata != NULL, _("cannot copy section data: %s")); |
| 268 | *newdata = *data; |
| 269 | elf_flagdata (newdata, ELF_C_SET, ELF_F_DIRTY); |
| 270 | } |
| 271 | } |
| 272 | |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 273 | /* Create directories containing PATH. */ |
| 274 | static void |
| 275 | make_directories (const char *path) |
| 276 | { |
| 277 | const char *lastslash = strrchr (path, '/'); |
| 278 | if (lastslash == NULL) |
| 279 | return; |
| 280 | |
| 281 | while (lastslash > path && lastslash[-1] == '/') |
| 282 | --lastslash; |
| 283 | if (lastslash == path) |
| 284 | return; |
| 285 | |
| 286 | char *dir = strndupa (path, lastslash - path); |
| 287 | while (mkdir (dir, 0777) < 0 && errno != EEXIST) |
| 288 | if (errno == ENOENT) |
| 289 | make_directories (dir); |
| 290 | else |
| 291 | error (EXIT_FAILURE, errno, _("cannot create directory '%s'"), dir); |
| 292 | } |
| 293 | |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 294 | |
| 295 | /* The binutils linker leaves gratuitous section symbols in .symtab |
| 296 | that strip has to remove. Older linkers likewise include a |
| 297 | symbol for every section, even unallocated ones, in .dynsym. |
| 298 | Because of this, the related sections can shrink in the stripped |
| 299 | file from their original size. Older versions of strip do not |
| 300 | adjust the sh_size field in the debuginfo file's SHT_NOBITS |
| 301 | version of the section header, so it can appear larger. */ |
| 302 | static bool |
| 303 | section_can_shrink (const GElf_Shdr *shdr) |
| 304 | { |
| 305 | switch (shdr->sh_type) |
| 306 | { |
| 307 | case SHT_SYMTAB: |
| 308 | case SHT_DYNSYM: |
| 309 | case SHT_HASH: |
| 310 | case SHT_GNU_versym: |
| 311 | return true; |
| 312 | } |
| 313 | return false; |
| 314 | } |
| 315 | |
| 316 | /* See if this symbol table has a leading section symbol for every single |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 317 | section, in order. The binutils linker produces this. While we're here, |
| 318 | update each section symbol's st_value. */ |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 319 | static size_t |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 320 | symtab_count_leading_section_symbols (Elf *elf, Elf_Scn *scn, size_t shnum, |
| 321 | Elf_Data *newsymdata) |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 322 | { |
| 323 | Elf_Data *data = elf_getdata (scn, NULL); |
| 324 | Elf_Data *shndxdata = NULL; /* XXX */ |
| 325 | |
| 326 | for (size_t i = 1; i < shnum; ++i) |
| 327 | { |
| 328 | GElf_Sym sym_mem; |
| 329 | GElf_Word shndx = SHN_UNDEF; |
| 330 | GElf_Sym *sym = gelf_getsymshndx (data, shndxdata, i, &sym_mem, &shndx); |
| 331 | ELF_CHECK (sym != NULL, _("cannot get symbol table entry: %s")); |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 332 | |
| 333 | GElf_Shdr shdr_mem; |
| 334 | GElf_Shdr *shdr = gelf_getshdr (elf_getscn (elf, i), &shdr_mem); |
| 335 | ELF_CHECK (shdr != NULL, _("cannot get section header: %s")); |
| 336 | |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 337 | if (sym->st_shndx != SHN_XINDEX) |
| 338 | shndx = sym->st_shndx; |
| 339 | |
| 340 | if (shndx != i || GELF_ST_TYPE (sym->st_info) != STT_SECTION) |
| 341 | return i; |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 342 | |
| 343 | sym->st_value = shdr->sh_addr; |
| 344 | if (sym->st_shndx != SHN_XINDEX) |
| 345 | shndx = SHN_UNDEF; |
| 346 | ELF_CHECK (gelf_update_symshndx (newsymdata, shndxdata, i, sym, shndx), |
| 347 | _("cannot update symbol table: %s")); |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 348 | } |
| 349 | |
| 350 | return shnum; |
| 351 | } |
| 352 | |
| 353 | /* We expanded the output section, so update its header. */ |
| 354 | static void |
| 355 | update_sh_size (Elf_Scn *outscn, const Elf_Data *data) |
| 356 | { |
| 357 | GElf_Shdr shdr_mem; |
| 358 | GElf_Shdr *newshdr = gelf_getshdr (outscn, &shdr_mem); |
| 359 | ELF_CHECK (newshdr != NULL, _("cannot get section header: %s")); |
| 360 | |
| 361 | newshdr->sh_size = data->d_size; |
| 362 | |
| 363 | ELF_CHECK (gelf_update_shdr (outscn, newshdr), |
| 364 | _("cannot update section header: %s")); |
| 365 | } |
| 366 | |
| 367 | /* Update relocation sections using the symbol table. */ |
| 368 | static void |
| 369 | adjust_relocs (Elf_Scn *outscn, Elf_Scn *inscn, const GElf_Shdr *shdr, |
| 370 | size_t map[], const GElf_Shdr *symshdr) |
| 371 | { |
| 372 | Elf_Data *data = elf_getdata (outscn, NULL); |
| 373 | |
| 374 | inline void adjust_reloc (GElf_Xword *info) |
| 375 | { |
| 376 | size_t ndx = GELF_R_SYM (*info); |
| 377 | if (ndx != STN_UNDEF) |
| 378 | *info = GELF_R_INFO (map[ndx - 1], GELF_R_TYPE (*info)); |
| 379 | } |
| 380 | |
| 381 | switch (shdr->sh_type) |
| 382 | { |
| 383 | case SHT_REL: |
| 384 | for (size_t i = 0; i < shdr->sh_size / shdr->sh_entsize; ++i) |
| 385 | { |
| 386 | GElf_Rel rel_mem; |
| 387 | GElf_Rel *rel = gelf_getrel (data, i, &rel_mem); |
| 388 | adjust_reloc (&rel->r_info); |
| 389 | ELF_CHECK (gelf_update_rel (data, i, rel), |
| 390 | _("cannot update relocation: %s")); |
| 391 | } |
| 392 | break; |
| 393 | |
| 394 | case SHT_RELA: |
| 395 | for (size_t i = 0; i < shdr->sh_size / shdr->sh_entsize; ++i) |
| 396 | { |
| 397 | GElf_Rela rela_mem; |
| 398 | GElf_Rela *rela = gelf_getrela (data, i, &rela_mem); |
| 399 | adjust_reloc (&rela->r_info); |
| 400 | ELF_CHECK (gelf_update_rela (data, i, rela), |
| 401 | _("cannot update relocation: %s")); |
| 402 | } |
| 403 | break; |
| 404 | |
| 405 | case SHT_GROUP: |
| 406 | { |
| 407 | GElf_Shdr shdr_mem; |
| 408 | GElf_Shdr *newshdr = gelf_getshdr (outscn, &shdr_mem); |
| 409 | ELF_CHECK (newshdr != NULL, _("cannot get section header: %s")); |
| 410 | if (newshdr->sh_info != STN_UNDEF) |
| 411 | { |
| 412 | newshdr->sh_info = map[newshdr->sh_info - 1]; |
| 413 | ELF_CHECK (gelf_update_shdr (outscn, newshdr), |
| 414 | _("cannot update section header: %s")); |
| 415 | } |
| 416 | break; |
| 417 | } |
| 418 | |
| 419 | case SHT_HASH: |
| 420 | /* We must expand the table and rejigger its contents. */ |
| 421 | { |
| 422 | const size_t nsym = symshdr->sh_size / symshdr->sh_entsize; |
| 423 | const size_t onent = shdr->sh_size / shdr->sh_entsize; |
| 424 | assert (data->d_size == shdr->sh_size); |
| 425 | |
| 426 | #define CONVERT_HASH(Hash_Word) \ |
| 427 | { \ |
| 428 | const Hash_Word *const old_hash = data->d_buf; \ |
| 429 | const size_t nbucket = old_hash[0]; \ |
| 430 | const size_t nchain = old_hash[1]; \ |
| 431 | const Hash_Word *const old_bucket = &old_hash[2]; \ |
| 432 | const Hash_Word *const old_chain = &old_bucket[nbucket]; \ |
| 433 | assert (onent == 2 + nbucket + nchain); \ |
| 434 | \ |
| 435 | const size_t nent = 2 + nbucket + nsym; \ |
| 436 | Hash_Word *const new_hash = xcalloc (nent, sizeof new_hash[0]); \ |
| 437 | Hash_Word *const new_bucket = &new_hash[2]; \ |
| 438 | Hash_Word *const new_chain = &new_bucket[nbucket]; \ |
| 439 | \ |
| 440 | new_hash[0] = nbucket; \ |
| 441 | new_hash[1] = nsym; \ |
| 442 | for (size_t i = 0; i < nbucket; ++i) \ |
| 443 | if (old_bucket[i] != STN_UNDEF) \ |
| 444 | new_bucket[i] = map[old_bucket[i] - 1]; \ |
| 445 | \ |
| 446 | for (size_t i = 1; i < nchain; ++i) \ |
| 447 | if (old_chain[i] != STN_UNDEF) \ |
| 448 | new_chain[map[i - 1]] = map[old_chain[i] - 1]; \ |
| 449 | \ |
| 450 | data->d_buf = new_hash; \ |
| 451 | data->d_size = nent * sizeof new_hash[0]; \ |
| 452 | } |
| 453 | |
| 454 | switch (shdr->sh_entsize) |
| 455 | { |
| 456 | case 4: |
| 457 | CONVERT_HASH (Elf32_Word); |
| 458 | break; |
| 459 | case 8: |
| 460 | CONVERT_HASH (Elf64_Xword); |
| 461 | break; |
| 462 | default: |
| 463 | abort (); |
| 464 | } |
| 465 | |
| 466 | elf_flagdata (data, ELF_C_SET, ELF_F_DIRTY); |
| 467 | update_sh_size (outscn, data); |
| 468 | |
| 469 | #undef CONVERT_HASH |
| 470 | } |
| 471 | break; |
| 472 | |
| 473 | case SHT_GNU_versym: |
| 474 | /* We must expand the table and move its elements around. */ |
| 475 | { |
| 476 | const size_t nent = symshdr->sh_size / symshdr->sh_entsize; |
| 477 | const size_t onent = shdr->sh_size / shdr->sh_entsize; |
| 478 | assert (nent >= onent); |
| 479 | |
| 480 | /* We don't bother using gelf_update_versym because there is |
| 481 | really no conversion to be done. */ |
| 482 | assert (sizeof (Elf32_Versym) == sizeof (GElf_Versym)); |
| 483 | assert (sizeof (Elf64_Versym) == sizeof (GElf_Versym)); |
| 484 | GElf_Versym *versym = xcalloc (nent, sizeof versym[0]); |
| 485 | |
| 486 | for (size_t i = 1; i < onent; ++i) |
| 487 | { |
| 488 | GElf_Versym *v = gelf_getversym (data, i, &versym[map[i - 1]]); |
| 489 | ELF_CHECK (v != NULL, _("cannot get symbol version: %s")); |
| 490 | } |
| 491 | |
| 492 | data->d_buf = versym; |
| 493 | data->d_size = nent * shdr->sh_entsize; |
| 494 | elf_flagdata (data, ELF_C_SET, ELF_F_DIRTY); |
| 495 | update_sh_size (outscn, data); |
| 496 | } |
| 497 | break; |
| 498 | |
| 499 | default: |
| 500 | error (EXIT_FAILURE, 0, |
| 501 | _("unexpected section type in [%Zu] with sh_link to symtab"), |
| 502 | elf_ndxscn (inscn)); |
| 503 | } |
| 504 | } |
| 505 | |
| 506 | /* Adjust all the relocation sections in the file. */ |
| 507 | static void |
| 508 | adjust_all_relocs (Elf *elf, Elf_Scn *symtab, const GElf_Shdr *symshdr, |
| 509 | size_t map[]) |
| 510 | { |
| 511 | size_t new_sh_link = elf_ndxscn (symtab); |
| 512 | Elf_Scn *scn = NULL; |
| 513 | while ((scn = elf_nextscn (elf, scn)) != NULL) |
| 514 | if (scn != symtab) |
| 515 | { |
| 516 | GElf_Shdr shdr_mem; |
| 517 | GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); |
| 518 | ELF_CHECK (shdr != NULL, _("cannot get section header: %s")); |
| 519 | if (shdr->sh_type != SHT_NOBITS && shdr->sh_link == new_sh_link) |
| 520 | adjust_relocs (scn, scn, shdr, map, symshdr); |
| 521 | } |
| 522 | } |
| 523 | |
| 524 | /* The original file probably had section symbols for all of its |
| 525 | sections, even the unallocated ones. To match it as closely as |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 526 | possible, add in section symbols for the added sections. */ |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 527 | static Elf_Data * |
| 528 | add_new_section_symbols (Elf_Scn *old_symscn, size_t old_shnum, |
| 529 | Elf *elf, Elf_Scn *symscn, size_t shnum) |
| 530 | { |
| 531 | const size_t added = shnum - old_shnum; |
| 532 | |
| 533 | GElf_Shdr shdr_mem; |
| 534 | GElf_Shdr *shdr = gelf_getshdr (symscn, &shdr_mem); |
| 535 | ELF_CHECK (shdr != NULL, _("cannot get section header: %s")); |
| 536 | |
| 537 | const size_t nsym = shdr->sh_size / shdr->sh_entsize; |
| 538 | size_t symndx_map[nsym - 1]; |
| 539 | |
| 540 | shdr->sh_info += added; |
| 541 | shdr->sh_size += added * shdr->sh_entsize; |
| 542 | |
| 543 | ELF_CHECK (gelf_update_shdr (symscn, shdr), |
| 544 | _("cannot update section header: %s")); |
| 545 | |
| 546 | Elf_Data *symdata = elf_getdata (symscn, NULL); |
| 547 | Elf_Data *shndxdata = NULL; /* XXX */ |
| 548 | |
| 549 | symdata->d_size = shdr->sh_size; |
| 550 | symdata->d_buf = xmalloc (symdata->d_size); |
| 551 | |
| 552 | /* Copy the existing section symbols. */ |
| 553 | Elf_Data *old_symdata = elf_getdata (old_symscn, NULL); |
| 554 | for (size_t i = 0; i < old_shnum; ++i) |
| 555 | { |
| 556 | GElf_Sym sym_mem; |
| 557 | GElf_Word shndx = SHN_UNDEF; |
| 558 | GElf_Sym *sym = gelf_getsymshndx (old_symdata, shndxdata, |
| 559 | i, &sym_mem, &shndx); |
| 560 | ELF_CHECK (gelf_update_symshndx (symdata, shndxdata, i, |
| 561 | sym, shndx), |
| 562 | _("cannot update symbol table: %s")); |
| 563 | |
| 564 | if (i > 0) |
| 565 | symndx_map[i - 1] = i; |
| 566 | } |
| 567 | |
| 568 | /* Add in the new section symbols. */ |
| 569 | for (size_t i = old_shnum; i < shnum; ++i) |
| 570 | { |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 571 | GElf_Shdr i_shdr_mem; |
| 572 | GElf_Shdr *i_shdr = gelf_getshdr (elf_getscn (elf, i), &i_shdr_mem); |
| 573 | ELF_CHECK (i_shdr != NULL, _("cannot get section header: %s")); |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 574 | GElf_Sym sym = |
| 575 | { |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 576 | .st_value = i_shdr->sh_addr, |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 577 | .st_info = GELF_ST_INFO (STB_LOCAL, STT_SECTION), |
| 578 | .st_shndx = i < SHN_LORESERVE ? i : SHN_XINDEX |
| 579 | }; |
| 580 | GElf_Word shndx = i < SHN_LORESERVE ? SHN_UNDEF : i; |
| 581 | ELF_CHECK (gelf_update_symshndx (symdata, shndxdata, i, |
| 582 | &sym, shndx), |
| 583 | _("cannot update symbol table: %s")); |
| 584 | } |
| 585 | |
| 586 | /* Now copy the rest of the existing symbols. */ |
| 587 | for (size_t i = old_shnum; i < nsym; ++i) |
| 588 | { |
| 589 | GElf_Sym sym_mem; |
| 590 | GElf_Word shndx = SHN_UNDEF; |
| 591 | GElf_Sym *sym = gelf_getsymshndx (old_symdata, shndxdata, |
| 592 | i, &sym_mem, &shndx); |
| 593 | ELF_CHECK (gelf_update_symshndx (symdata, shndxdata, |
| 594 | i + added, sym, shndx), |
| 595 | _("cannot update symbol table: %s")); |
| 596 | |
| 597 | symndx_map[i - 1] = i + added; |
| 598 | } |
| 599 | |
| 600 | /* Adjust any relocations referring to the old symbol table. */ |
| 601 | adjust_all_relocs (elf, symscn, shdr, symndx_map); |
| 602 | |
| 603 | return symdata; |
| 604 | } |
| 605 | |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 606 | /* This has the side effect of updating STT_SECTION symbols' values, |
| 607 | in case of prelink adjustments. */ |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 608 | static Elf_Data * |
| 609 | check_symtab_section_symbols (Elf *elf, Elf_Scn *scn, |
| 610 | size_t shnum, size_t shstrndx, |
| 611 | Elf_Scn *oscn, size_t oshnum, size_t oshstrndx, |
| 612 | size_t debuglink) |
| 613 | { |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 614 | size_t n = symtab_count_leading_section_symbols (elf, oscn, oshnum, |
| 615 | elf_getdata (scn, NULL)); |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 616 | |
| 617 | if (n == oshnum) |
| 618 | return add_new_section_symbols (oscn, n, elf, scn, shnum); |
| 619 | |
| 620 | if (n == oshstrndx || (n == debuglink && n == oshstrndx - 1)) |
| 621 | return add_new_section_symbols (oscn, n, elf, scn, shstrndx); |
| 622 | |
| 623 | return NULL; |
| 624 | } |
| 625 | |
| 626 | struct section |
| 627 | { |
| 628 | Elf_Scn *scn; |
| 629 | const char *name; |
| 630 | Elf_Scn *outscn; |
| 631 | struct Ebl_Strent *strent; |
| 632 | GElf_Shdr shdr; |
| 633 | }; |
| 634 | |
| 635 | static int |
| 636 | compare_alloc_sections (const struct section *s1, const struct section *s2) |
| 637 | { |
| 638 | /* Sort by address. */ |
| 639 | if (s1->shdr.sh_addr < s2->shdr.sh_addr) |
| 640 | return -1; |
| 641 | if (s1->shdr.sh_addr > s2->shdr.sh_addr) |
| 642 | return 1; |
| 643 | |
| 644 | return 0; |
| 645 | } |
| 646 | |
| 647 | static int |
| 648 | compare_unalloc_sections (const GElf_Shdr *shdr1, const GElf_Shdr *shdr2, |
| 649 | const char *name1, const char *name2) |
| 650 | { |
| 651 | /* Sort by sh_flags as an arbitrary ordering. */ |
| 652 | if (shdr1->sh_flags < shdr2->sh_flags) |
| 653 | return -1; |
| 654 | if (shdr1->sh_flags > shdr2->sh_flags) |
| 655 | return 1; |
| 656 | |
| 657 | /* Sort by name as last resort. */ |
| 658 | return strcmp (name1, name2); |
| 659 | } |
| 660 | |
| 661 | static int |
| 662 | compare_sections (const void *a, const void *b) |
| 663 | { |
| 664 | const struct section *s1 = a; |
| 665 | const struct section *s2 = b; |
| 666 | |
| 667 | /* Sort all non-allocated sections last. */ |
| 668 | if ((s1->shdr.sh_flags ^ s2->shdr.sh_flags) & SHF_ALLOC) |
| 669 | return (s1->shdr.sh_flags & SHF_ALLOC) ? -1 : 1; |
| 670 | |
| 671 | return ((s1->shdr.sh_flags & SHF_ALLOC) |
| 672 | ? compare_alloc_sections (s1, s2) |
| 673 | : compare_unalloc_sections (&s1->shdr, &s2->shdr, |
| 674 | s1->name, s2->name)); |
| 675 | } |
| 676 | |
| 677 | |
| 678 | struct symbol |
| 679 | { |
| 680 | size_t *map; |
| 681 | |
| 682 | union |
| 683 | { |
| 684 | const char *name; |
| 685 | struct Ebl_Strent *strent; |
| 686 | }; |
| 687 | GElf_Addr value; |
| 688 | GElf_Xword size; |
| 689 | GElf_Word shndx; |
| 690 | union |
| 691 | { |
| 692 | struct |
| 693 | { |
| 694 | uint8_t info; |
| 695 | uint8_t other; |
| 696 | } info; |
| 697 | int16_t compare; |
| 698 | }; |
| 699 | }; |
| 700 | |
| 701 | /* Collect input symbols into our internal form. */ |
| 702 | static void |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 703 | collect_symbols (Elf *outelf, Elf_Scn *symscn, Elf_Scn *strscn, |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 704 | const size_t nent, const GElf_Addr bias, |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 705 | const size_t scnmap[], struct symbol *table, size_t *map, |
| 706 | struct section *split_bss) |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 707 | { |
| 708 | Elf_Data *symdata = elf_getdata (symscn, NULL); |
| 709 | Elf_Data *strdata = elf_getdata (strscn, NULL); |
| 710 | Elf_Data *shndxdata = NULL; /* XXX */ |
| 711 | |
| 712 | for (size_t i = 1; i < nent; ++i) |
| 713 | { |
| 714 | GElf_Sym sym_mem; |
| 715 | GElf_Word shndx = SHN_UNDEF; |
| 716 | GElf_Sym *sym = gelf_getsymshndx (symdata, shndxdata, i, |
| 717 | &sym_mem, &shndx); |
| 718 | ELF_CHECK (sym != NULL, _("cannot get symbol table entry: %s")); |
| 719 | if (sym->st_shndx != SHN_XINDEX) |
| 720 | shndx = sym->st_shndx; |
| 721 | |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 722 | if (sym->st_name >= strdata->d_size) |
| 723 | error (EXIT_FAILURE, 0, |
| 724 | _("invalid string offset in symbol [%Zu]"), i); |
| 725 | |
| 726 | struct symbol *s = &table[i - 1]; |
| 727 | s->map = &map[i - 1]; |
| 728 | s->name = strdata->d_buf + sym->st_name; |
| 729 | s->value = sym->st_value + bias; |
| 730 | s->size = sym->st_size; |
| 731 | s->shndx = shndx; |
| 732 | s->info.info = sym->st_info; |
| 733 | s->info.other = sym->st_other; |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 734 | |
| 735 | if (scnmap != NULL && shndx != SHN_UNDEF && shndx < SHN_LORESERVE) |
| 736 | s->shndx = scnmap[shndx - 1]; |
| 737 | |
| 738 | if (GELF_ST_TYPE (s->info.info) == STT_SECTION) |
| 739 | { |
| 740 | GElf_Shdr shdr_mem; |
| 741 | GElf_Shdr *shdr = gelf_getshdr (elf_getscn (outelf, shndx), |
| 742 | &shdr_mem); |
| 743 | ELF_CHECK (shdr != NULL, _("cannot get section header: %s")); |
| 744 | |
| 745 | if (GELF_ST_TYPE (s->info.info) == STT_SECTION) |
| 746 | /* Update the value to match the output section. */ |
| 747 | s->value = shdr->sh_addr; |
| 748 | } |
| 749 | else if (split_bss != NULL |
| 750 | && s->value < split_bss->shdr.sh_addr |
| 751 | && s->value >= split_bss[-1].shdr.sh_addr |
| 752 | && shndx == elf_ndxscn (split_bss->outscn)) |
| 753 | /* This symbol was in .bss and was split into .dynbss. */ |
| 754 | s->shndx = elf_ndxscn (split_bss[-1].outscn); |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 755 | } |
| 756 | } |
| 757 | |
| 758 | |
| 759 | #define CMP(value) \ |
| 760 | if (s1->value < s2->value) \ |
| 761 | return -1; \ |
| 762 | if (s1->value > s2->value) \ |
| 763 | return 1 |
| 764 | |
| 765 | /* Compare symbols with a consistent ordering, |
| 766 | but one only meaningful for equality. */ |
| 767 | static int |
| 768 | compare_symbols (const void *a, const void *b) |
| 769 | { |
| 770 | const struct symbol *s1 = a; |
| 771 | const struct symbol *s2 = b; |
| 772 | |
| 773 | CMP (value); |
| 774 | CMP (size); |
| 775 | CMP (shndx); |
| 776 | |
| 777 | return (s1->compare - s2->compare) ?: strcmp (s1->name, s2->name); |
| 778 | } |
| 779 | |
| 780 | /* Compare symbols for output order after slots have been assigned. */ |
| 781 | static int |
| 782 | compare_symbols_output (const void *a, const void *b) |
| 783 | { |
| 784 | const struct symbol *s1 = a; |
| 785 | const struct symbol *s2 = b; |
| 786 | int cmp; |
| 787 | |
| 788 | /* Sort discarded symbols last. */ |
| 789 | cmp = (*s1->map == 0) - (*s2->map == 0); |
| 790 | |
| 791 | if (cmp == 0) |
| 792 | /* Local symbols must come first. */ |
| 793 | cmp = ((GELF_ST_BIND (s2->info.info) == STB_LOCAL) |
| 794 | - (GELF_ST_BIND (s1->info.info) == STB_LOCAL)); |
| 795 | |
| 796 | if (cmp == 0) |
| 797 | /* binutils always puts section symbols first. */ |
| 798 | cmp = ((GELF_ST_TYPE (s2->info.info) == STT_SECTION) |
| 799 | - (GELF_ST_TYPE (s1->info.info) == STT_SECTION)); |
| 800 | |
| 801 | if (cmp == 0) |
| 802 | { |
| 803 | if (GELF_ST_TYPE (s1->info.info) == STT_SECTION) |
| 804 | { |
| 805 | /* binutils always puts section symbols in section index order. */ |
| 806 | CMP (shndx); |
| 807 | else |
| 808 | assert (s1 == s2); |
| 809 | } |
| 810 | |
| 811 | /* Nothing really matters, so preserve the original order. */ |
| 812 | CMP (map); |
| 813 | else |
| 814 | assert (s1 == s2); |
| 815 | } |
| 816 | |
| 817 | return cmp; |
| 818 | } |
| 819 | |
| 820 | #undef CMP |
| 821 | |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 822 | /* Locate a matching allocated section in SECTIONS. */ |
| 823 | static struct section * |
| 824 | find_alloc_section (const GElf_Shdr *shdr, GElf_Addr bias, const char *name, |
| 825 | struct section sections[], size_t nalloc) |
| 826 | { |
| 827 | const GElf_Addr addr = shdr->sh_addr + bias; |
| 828 | size_t l = 0, u = nalloc; |
| 829 | while (l < u) |
| 830 | { |
| 831 | size_t i = (l + u) / 2; |
| 832 | if (addr < sections[i].shdr.sh_addr) |
| 833 | u = i; |
| 834 | else if (addr > sections[i].shdr.sh_addr) |
| 835 | l = i + 1; |
| 836 | else |
| 837 | { |
| 838 | /* We've found allocated sections with this address. |
| 839 | Find one with matching size, flags, and name. */ |
| 840 | while (i > 0 && sections[i - 1].shdr.sh_addr == addr) |
| 841 | --i; |
| 842 | for (; i < nalloc && sections[i].shdr.sh_addr == addr; |
| 843 | ++i) |
| 844 | if (sections[i].shdr.sh_flags == shdr->sh_flags |
| 845 | && (sections[i].shdr.sh_size == shdr->sh_size |
| 846 | || (sections[i].shdr.sh_size < shdr->sh_size |
| 847 | && section_can_shrink (§ions[i].shdr))) |
| 848 | && !strcmp (sections[i].name, name)) |
| 849 | return §ions[i]; |
| 850 | break; |
| 851 | } |
| 852 | } |
| 853 | return NULL; |
| 854 | } |
| 855 | |
| 856 | static inline const char * |
| 857 | get_section_name (size_t ndx, const GElf_Shdr *shdr, const Elf_Data *shstrtab) |
| 858 | { |
| 859 | if (shdr->sh_name >= shstrtab->d_size) |
| 860 | error (EXIT_FAILURE, 0, _("cannot read section [%Zu] name: %s"), |
| 861 | ndx, elf_errmsg (-1)); |
| 862 | return shstrtab->d_buf + shdr->sh_name; |
| 863 | } |
| 864 | |
| 865 | /* Fix things up when prelink has moved some allocated sections around |
| 866 | and the debuginfo file's section headers no longer match up. |
| 867 | This fills in SECTIONS[0..NALLOC-1].outscn or exits. |
| 868 | If there was a .bss section that was split into two sections |
| 869 | with the new one preceding it in sh_addr, we return that pointer. */ |
| 870 | static struct section * |
| 871 | find_alloc_sections_prelink (Elf *debug, Elf_Data *debug_shstrtab, |
| 872 | Elf *main, const GElf_Ehdr *main_ehdr, |
| 873 | Elf_Data *main_shstrtab, GElf_Addr bias, |
| 874 | struct section *sections, |
| 875 | size_t nalloc, size_t nsections) |
| 876 | { |
| 877 | /* Clear assignments that might have been bogus. */ |
| 878 | for (size_t i = 0; i < nalloc; ++i) |
| 879 | sections[i].outscn = NULL; |
| 880 | |
| 881 | Elf_Scn *undo = NULL; |
| 882 | for (size_t i = nalloc; i < nsections; ++i) |
| 883 | { |
| 884 | const struct section *sec = §ions[i]; |
| 885 | if (sec->shdr.sh_type == SHT_PROGBITS |
| 886 | && !(sec->shdr.sh_flags & SHF_ALLOC) |
| 887 | && !strcmp (sec->name, ".gnu.prelink_undo")) |
| 888 | { |
| 889 | undo = sec->scn; |
| 890 | break; |
| 891 | } |
| 892 | } |
| 893 | |
| 894 | /* Find the original allocated sections before prelinking. */ |
| 895 | struct section *undo_sections = NULL; |
| 896 | size_t undo_nalloc = 0; |
| 897 | if (undo != NULL) |
| 898 | { |
| 899 | Elf_Data *undodata = elf_rawdata (undo, NULL); |
| 900 | ELF_CHECK (undodata != NULL, |
| 901 | _("cannot read '.gnu.prelink_undo' section: %s")); |
| 902 | |
| 903 | union |
| 904 | { |
| 905 | Elf32_Ehdr e32; |
| 906 | Elf64_Ehdr e64; |
| 907 | } ehdr; |
| 908 | Elf_Data dst = |
| 909 | { |
| 910 | .d_buf = &ehdr, |
| 911 | .d_size = sizeof ehdr, |
| 912 | .d_type = ELF_T_EHDR, |
| 913 | .d_version = EV_CURRENT |
| 914 | }; |
| 915 | Elf_Data src = *undodata; |
| 916 | src.d_size = gelf_fsize (main, ELF_T_EHDR, 1, EV_CURRENT); |
| 917 | src.d_type = ELF_T_EHDR; |
| 918 | ELF_CHECK (gelf_xlatetom (main, &dst, &src, |
| 919 | main_ehdr->e_ident[EI_DATA]) != NULL, |
| 920 | _("cannot read '.gnu.prelink_undo' section: %s")); |
| 921 | |
| 922 | uint_fast16_t phnum; |
| 923 | uint_fast16_t shnum; |
| 924 | if (ehdr.e32.e_ident[EI_CLASS] == ELFCLASS32) |
| 925 | { |
| 926 | phnum = ehdr.e32.e_phnum; |
| 927 | shnum = ehdr.e32.e_shnum; |
| 928 | } |
| 929 | else |
| 930 | { |
| 931 | phnum = ehdr.e64.e_phnum; |
| 932 | shnum = ehdr.e64.e_shnum; |
| 933 | } |
| 934 | |
| 935 | size_t phsize = gelf_fsize (main, ELF_T_PHDR, phnum, EV_CURRENT); |
| 936 | src.d_buf += src.d_size + phsize; |
| 937 | src.d_size = gelf_fsize (main, ELF_T_SHDR, shnum - 1, EV_CURRENT); |
| 938 | src.d_type = ELF_T_SHDR; |
| 939 | if ((size_t) (src.d_buf - undodata->d_buf) > undodata->d_size |
| 940 | || undodata->d_size - (src.d_buf - undodata->d_buf) != src.d_size) |
| 941 | error (EXIT_FAILURE, 0, _("invalid contents in '%s' section"), |
| 942 | ".gnu.prelink_undo"); |
| 943 | |
| 944 | union |
| 945 | { |
| 946 | Elf32_Shdr s32[shnum - 1]; |
| 947 | Elf64_Shdr s64[shnum - 1]; |
| 948 | } shdr; |
| 949 | dst.d_buf = &shdr; |
| 950 | dst.d_size = sizeof shdr; |
| 951 | ELF_CHECK (gelf_xlatetom (main, &dst, &src, |
| 952 | main_ehdr->e_ident[EI_DATA]) != NULL, |
| 953 | _("cannot read '.gnu.prelink_undo' section: %s")); |
| 954 | |
| 955 | undo_sections = xmalloc ((shnum - 1) * sizeof undo_sections[0]); |
| 956 | for (size_t i = 0; i < shnum - 1; ++i) |
| 957 | { |
| 958 | struct section *sec = &undo_sections[undo_nalloc]; |
| 959 | if (ehdr.e32.e_ident[EI_CLASS] == ELFCLASS32) |
| 960 | { |
| 961 | #define COPY(field) sec->shdr.field = shdr.s32[i].field |
| 962 | COPY (sh_name); |
| 963 | COPY (sh_type); |
| 964 | COPY (sh_flags); |
| 965 | COPY (sh_addr); |
| 966 | COPY (sh_offset); |
| 967 | COPY (sh_size); |
| 968 | COPY (sh_link); |
| 969 | COPY (sh_info); |
| 970 | COPY (sh_addralign); |
| 971 | COPY (sh_entsize); |
| 972 | #undef COPY |
| 973 | } |
| 974 | else |
| 975 | sec->shdr = shdr.s64[i]; |
| 976 | if (sec->shdr.sh_flags & SHF_ALLOC) |
| 977 | { |
| 978 | sec->shdr.sh_addr += bias; |
| 979 | sec->name = get_section_name (i + 1, &sec->shdr, main_shstrtab); |
| 980 | sec->scn = elf_getscn (main, i + 1); /* Really just for ndx. */ |
| 981 | sec->outscn = NULL; |
| 982 | sec->strent = NULL; |
| 983 | ++undo_nalloc; |
| 984 | } |
| 985 | } |
| 986 | qsort (undo_sections, undo_nalloc, |
| 987 | sizeof undo_sections[0], compare_sections); |
| 988 | } |
| 989 | |
| 990 | bool fail = false; |
| 991 | inline void check_match (bool match, Elf_Scn *scn, const char *name) |
| 992 | { |
| 993 | if (!match) |
| 994 | { |
| 995 | fail = true; |
| 996 | error (0, 0, _("cannot find matching section for [%Zu] '%s'"), |
| 997 | elf_ndxscn (scn), name); |
| 998 | } |
| 999 | } |
| 1000 | |
| 1001 | Elf_Scn *scn = NULL; |
| 1002 | while ((scn = elf_nextscn (debug, scn)) != NULL) |
| 1003 | { |
| 1004 | GElf_Shdr shdr_mem; |
| 1005 | GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); |
| 1006 | ELF_CHECK (shdr != NULL, _("cannot get section header: %s")); |
| 1007 | |
| 1008 | if (!(shdr->sh_flags & SHF_ALLOC)) |
| 1009 | continue; |
| 1010 | |
| 1011 | const char *name = get_section_name (elf_ndxscn (scn), shdr, |
| 1012 | debug_shstrtab); |
| 1013 | |
| 1014 | if (undo_sections != NULL) |
| 1015 | { |
| 1016 | struct section *sec = find_alloc_section (shdr, 0, name, |
| 1017 | undo_sections, |
| 1018 | undo_nalloc); |
| 1019 | if (sec != NULL) |
| 1020 | { |
| 1021 | sec->outscn = scn; |
| 1022 | continue; |
| 1023 | } |
| 1024 | } |
| 1025 | |
| 1026 | /* If there is no prelink info, we are just here to find |
| 1027 | the sections to give error messages about. */ |
| 1028 | for (size_t i = 0; shdr != NULL && i < nalloc; ++i) |
| 1029 | if (sections[i].outscn == scn) |
| 1030 | shdr = NULL; |
| 1031 | check_match (shdr == NULL, scn, name); |
| 1032 | } |
| 1033 | |
| 1034 | if (fail) |
| 1035 | exit (EXIT_FAILURE); |
| 1036 | |
| 1037 | /* Now we have lined up output sections for each of the original sections |
| 1038 | before prelinking. Translate those to the prelinked sections. |
| 1039 | This matches what prelink's undo_sections does. */ |
| 1040 | struct section *split_bss = NULL; |
| 1041 | for (size_t i = 0; i < undo_nalloc; ++i) |
| 1042 | { |
| 1043 | const struct section *undo_sec = &undo_sections[i]; |
| 1044 | |
| 1045 | const char *name = undo_sec->name; |
| 1046 | scn = undo_sec->scn; /* This is just for elf_ndxscn. */ |
| 1047 | |
| 1048 | for (size_t j = 0; j < nalloc; ++j) |
| 1049 | { |
| 1050 | struct section *sec = §ions[j]; |
| 1051 | #define RELA_SCALED(field) \ |
| 1052 | (2 * sec->shdr.field == 3 * undo_sec->shdr.field) |
| 1053 | if (sec->outscn == NULL |
| 1054 | && sec->shdr.sh_name == undo_sec->shdr.sh_name |
| 1055 | && sec->shdr.sh_flags == undo_sec->shdr.sh_flags |
| 1056 | && sec->shdr.sh_addralign == undo_sec->shdr.sh_addralign |
| 1057 | && (((sec->shdr.sh_type == undo_sec->shdr.sh_type |
| 1058 | && sec->shdr.sh_entsize == undo_sec->shdr.sh_entsize |
| 1059 | && (sec->shdr.sh_size == undo_sec->shdr.sh_size |
| 1060 | || (sec->shdr.sh_size > undo_sec->shdr.sh_size |
| 1061 | && main_ehdr->e_type == ET_EXEC |
| 1062 | && !strcmp (sec->name, ".dynstr")))) |
| 1063 | || (sec->shdr.sh_size == undo_sec->shdr.sh_size |
| 1064 | && ((sec->shdr.sh_entsize == undo_sec->shdr.sh_entsize |
| 1065 | && undo_sec->shdr.sh_type == SHT_NOBITS) |
| 1066 | || undo_sec->shdr.sh_type == SHT_PROGBITS) |
| 1067 | && !strcmp (sec->name, ".plt"))) |
| 1068 | || (sec->shdr.sh_type == SHT_RELA |
| 1069 | && undo_sec->shdr.sh_type == SHT_REL |
| 1070 | && RELA_SCALED (sh_entsize) && RELA_SCALED (sh_size)) |
| 1071 | || (sec->shdr.sh_entsize == undo_sec->shdr.sh_entsize |
| 1072 | && (sec->shdr.sh_type == undo_sec->shdr.sh_type |
| 1073 | || (sec->shdr.sh_type == SHT_PROGBITS |
| 1074 | && undo_sec->shdr.sh_type == SHT_NOBITS)) |
| 1075 | && sec->shdr.sh_size < undo_sec->shdr.sh_size |
| 1076 | && (!strcmp (sec->name, ".bss") |
| 1077 | || !strcmp (sec->name, ".sbss")) |
| 1078 | && (split_bss = sec) > sections))) |
| 1079 | { |
| 1080 | sec->outscn = undo_sec->outscn; |
| 1081 | undo_sec = NULL; |
| 1082 | break; |
| 1083 | } |
| 1084 | } |
| 1085 | |
| 1086 | check_match (undo_sec == NULL, scn, name); |
| 1087 | } |
| 1088 | |
| 1089 | free (undo_sections); |
| 1090 | |
| 1091 | if (fail) |
| 1092 | exit (EXIT_FAILURE); |
| 1093 | |
| 1094 | return split_bss; |
| 1095 | } |
| 1096 | |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1097 | /* Fill in any SHT_NOBITS sections in UNSTRIPPED by |
| 1098 | copying their contents and sh_type from STRIPPED. */ |
| 1099 | static void |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 1100 | copy_elided_sections (Elf *unstripped, Elf *stripped, |
| 1101 | const GElf_Ehdr *stripped_ehdr, GElf_Addr bias) |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1102 | { |
| 1103 | size_t unstripped_shstrndx; |
| 1104 | ELF_CHECK (elf_getshstrndx (unstripped, &unstripped_shstrndx) == 0, |
| 1105 | _("cannot get section header string table section index: %s")); |
| 1106 | |
| 1107 | size_t stripped_shstrndx; |
| 1108 | ELF_CHECK (elf_getshstrndx (stripped, &stripped_shstrndx) == 0, |
| 1109 | _("cannot get section header string table section index: %s")); |
| 1110 | |
| 1111 | size_t unstripped_shnum; |
| 1112 | ELF_CHECK (elf_getshnum (unstripped, &unstripped_shnum) == 0, |
| 1113 | _("cannot get section count: %s")); |
| 1114 | |
| 1115 | size_t stripped_shnum; |
| 1116 | ELF_CHECK (elf_getshnum (stripped, &stripped_shnum) == 0, |
| 1117 | _("cannot get section count: %s")); |
| 1118 | |
| 1119 | /* Cache the stripped file's section details. */ |
| 1120 | struct section sections[stripped_shnum - 1]; |
| 1121 | Elf_Scn *scn = NULL; |
| 1122 | while ((scn = elf_nextscn (stripped, scn)) != NULL) |
| 1123 | { |
| 1124 | size_t i = elf_ndxscn (scn) - 1; |
| 1125 | GElf_Shdr *shdr = gelf_getshdr (scn, §ions[i].shdr); |
| 1126 | ELF_CHECK (shdr != NULL, _("cannot get section header: %s")); |
| 1127 | sections[i].name = elf_strptr (stripped, stripped_shstrndx, |
| 1128 | shdr->sh_name); |
| 1129 | if (sections[i].name == NULL) |
| 1130 | error (EXIT_FAILURE, 0, _("cannot read section [%Zu] name: %s"), |
| 1131 | elf_ndxscn (scn), elf_errmsg (-1)); |
| 1132 | sections[i].scn = scn; |
| 1133 | sections[i].outscn = NULL; |
| 1134 | sections[i].strent = NULL; |
| 1135 | } |
| 1136 | |
| 1137 | const struct section *stripped_symtab = NULL; |
| 1138 | |
| 1139 | /* Sort the sections, allocated by address and others after. */ |
| 1140 | qsort (sections, stripped_shnum - 1, sizeof sections[0], compare_sections); |
| 1141 | size_t nalloc = stripped_shnum - 1; |
| 1142 | while (nalloc > 0 && !(sections[nalloc - 1].shdr.sh_flags & SHF_ALLOC)) |
| 1143 | { |
| 1144 | --nalloc; |
| 1145 | if (sections[nalloc].shdr.sh_type == SHT_SYMTAB) |
| 1146 | stripped_symtab = §ions[nalloc]; |
| 1147 | } |
| 1148 | |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1149 | /* Locate a matching unallocated section in SECTIONS. */ |
| 1150 | inline struct section *find_unalloc_section (const GElf_Shdr *shdr, |
| 1151 | const char *name) |
| 1152 | { |
| 1153 | size_t l = nalloc, u = stripped_shnum - 1; |
| 1154 | while (l < u) |
| 1155 | { |
| 1156 | size_t i = (l + u) / 2; |
| 1157 | struct section *sec = §ions[i]; |
| 1158 | int cmp = compare_unalloc_sections (shdr, &sec->shdr, |
| 1159 | name, sec->name); |
| 1160 | if (cmp < 0) |
| 1161 | u = i; |
| 1162 | else if (cmp > 0) |
| 1163 | l = i + 1; |
| 1164 | else |
| 1165 | return sec; |
| 1166 | } |
| 1167 | return NULL; |
| 1168 | } |
| 1169 | |
| 1170 | Elf_Data *shstrtab = elf_getdata (elf_getscn (unstripped, |
| 1171 | unstripped_shstrndx), NULL); |
| 1172 | ELF_CHECK (shstrtab != NULL, |
| 1173 | _("cannot read section header string table: %s")); |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1174 | |
| 1175 | /* Match each debuginfo section with its corresponding stripped section. */ |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 1176 | bool check_prelink = false; |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1177 | Elf_Scn *unstripped_symtab = NULL; |
| 1178 | size_t unstripped_strtab_ndx = SHN_UNDEF; |
| 1179 | scn = NULL; |
| 1180 | while ((scn = elf_nextscn (unstripped, scn)) != NULL) |
| 1181 | { |
| 1182 | GElf_Shdr shdr_mem; |
| 1183 | GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); |
| 1184 | ELF_CHECK (shdr != NULL, _("cannot get section header: %s")); |
| 1185 | |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 1186 | if (shdr->sh_type == SHT_SYMTAB) |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1187 | { |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 1188 | unstripped_symtab = scn; |
| 1189 | unstripped_strtab_ndx = shdr->sh_link; |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1190 | continue; |
| 1191 | } |
| 1192 | |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 1193 | const size_t ndx = elf_ndxscn (scn); |
| 1194 | if (ndx == unstripped_shstrndx) |
| 1195 | continue; |
| 1196 | |
| 1197 | const char *name = get_section_name (ndx, shdr, shstrtab); |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1198 | |
| 1199 | /* Look for the section that matches. */ |
| 1200 | struct section *sec = ((shdr->sh_flags & SHF_ALLOC) |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 1201 | ? find_alloc_section (shdr, bias, name, |
| 1202 | sections, nalloc) |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1203 | : find_unalloc_section (shdr, name)); |
| 1204 | if (sec == NULL) |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 1205 | { |
| 1206 | if ((shdr->sh_flags & SHF_ALLOC) && stripped_ehdr->e_type != ET_REL) |
| 1207 | { |
| 1208 | /* If we couldn't figure it out, it may be a prelink issue. */ |
| 1209 | check_prelink = true; |
| 1210 | continue; |
| 1211 | } |
| 1212 | |
| 1213 | /* An additional unallocated section is fine if not SHT_NOBITS. |
| 1214 | We looked it up anyway in case it's an unallocated section |
| 1215 | copied in both files (e.g. SHT_NOTE), so we don't keep both. */ |
| 1216 | if (shdr->sh_type != SHT_NOBITS && !(shdr->sh_flags & SHF_ALLOC)) |
| 1217 | continue; |
| 1218 | |
| 1219 | /* Somehow some old .debug files wound up with SHT_NOBITS |
| 1220 | .comment sections, so let those pass. */ |
| 1221 | if (!(shdr->sh_flags & SHF_ALLOC) && !strcmp (name, ".comment")) |
| 1222 | continue; |
| 1223 | |
| 1224 | error (EXIT_FAILURE, 0, |
| 1225 | _("cannot find matching section for [%Zu] '%s'"), |
| 1226 | elf_ndxscn (scn), name); |
| 1227 | } |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1228 | |
| 1229 | sec->outscn = scn; |
| 1230 | } |
| 1231 | |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 1232 | /* If that failed due to changes made by prelink, we take another tack. |
| 1233 | We keep track of a .bss section that was partly split into .dynbss |
| 1234 | so that collect_symbols can update symbols' st_shndx fields. */ |
| 1235 | struct section *split_bss = NULL; |
| 1236 | if (check_prelink) |
| 1237 | { |
| 1238 | Elf_Data *data = elf_getdata (elf_getscn (stripped, stripped_shstrndx), |
| 1239 | NULL); |
| 1240 | ELF_CHECK (data != NULL, |
| 1241 | _("cannot read section header string table: %s")); |
| 1242 | split_bss = find_alloc_sections_prelink (unstripped, shstrtab, |
| 1243 | stripped, stripped_ehdr, |
| 1244 | data, bias, sections, |
| 1245 | nalloc, stripped_shnum - 1); |
| 1246 | } |
| 1247 | |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1248 | /* Make sure each main file section has a place to go. */ |
| 1249 | const struct section *stripped_dynsym = NULL; |
| 1250 | size_t debuglink = SHN_UNDEF; |
| 1251 | size_t ndx_section[stripped_shnum - 1]; |
| 1252 | struct Ebl_Strtab *strtab = NULL; |
| 1253 | for (struct section *sec = sections; |
| 1254 | sec < §ions[stripped_shnum - 1]; |
| 1255 | ++sec) |
| 1256 | { |
| 1257 | size_t secndx = elf_ndxscn (sec->scn); |
| 1258 | |
| 1259 | if (sec->outscn == NULL) |
| 1260 | { |
| 1261 | /* We didn't find any corresponding section for this. */ |
| 1262 | |
| 1263 | if (secndx == stripped_shstrndx) |
| 1264 | { |
| 1265 | /* We only need one .shstrtab. */ |
| 1266 | ndx_section[secndx - 1] = unstripped_shstrndx; |
| 1267 | continue; |
| 1268 | } |
| 1269 | |
| 1270 | if (unstripped_symtab != NULL && sec == stripped_symtab) |
| 1271 | { |
| 1272 | /* We don't need a second symbol table. */ |
| 1273 | ndx_section[secndx - 1] = elf_ndxscn (unstripped_symtab); |
| 1274 | continue; |
| 1275 | } |
| 1276 | |
| 1277 | if (unstripped_symtab != NULL && stripped_symtab != NULL |
| 1278 | && secndx == stripped_symtab->shdr.sh_link) |
| 1279 | { |
| 1280 | /* ... nor its string table. */ |
| 1281 | GElf_Shdr shdr_mem; |
| 1282 | GElf_Shdr *shdr = gelf_getshdr (unstripped_symtab, &shdr_mem); |
| 1283 | ELF_CHECK (shdr != NULL, _("cannot get section header: %s")); |
| 1284 | ndx_section[secndx - 1] = shdr->sh_link; |
| 1285 | continue; |
| 1286 | } |
| 1287 | |
| 1288 | if (!(sec->shdr.sh_flags & SHF_ALLOC) |
| 1289 | && !strcmp (sec->name, ".gnu_debuglink")) |
| 1290 | { |
| 1291 | /* This was created by stripping. We don't want it. */ |
| 1292 | debuglink = secndx; |
| 1293 | continue; |
| 1294 | } |
| 1295 | |
| 1296 | sec->outscn = elf_newscn (unstripped); |
| 1297 | Elf_Data *newdata = elf_newdata (sec->outscn); |
| 1298 | ELF_CHECK (newdata != NULL && gelf_update_shdr (sec->outscn, |
| 1299 | &sec->shdr), |
| 1300 | _("cannot add new section: %s")); |
| 1301 | |
| 1302 | if (strtab == NULL) |
| 1303 | strtab = ebl_strtabinit (true); |
| 1304 | sec->strent = ebl_strtabadd (strtab, sec->name, 0); |
| 1305 | ELF_CHECK (sec->strent != NULL, |
| 1306 | _("cannot add section name to string table: %s")); |
| 1307 | } |
| 1308 | |
| 1309 | /* Cache the mapping of original section indices to output sections. */ |
| 1310 | ndx_section[secndx - 1] = elf_ndxscn (sec->outscn); |
| 1311 | } |
| 1312 | |
| 1313 | Elf_Data *strtab_data = NULL; |
| 1314 | if (strtab != NULL) |
| 1315 | { |
| 1316 | /* We added some sections, so we need a new shstrtab. */ |
| 1317 | |
| 1318 | struct Ebl_Strent *unstripped_strent[unstripped_shnum - 1]; |
| 1319 | memset (unstripped_strent, 0, sizeof unstripped_strent); |
| 1320 | for (struct section *sec = sections; |
| 1321 | sec < §ions[stripped_shnum - 1]; |
| 1322 | ++sec) |
| 1323 | if (sec->outscn != NULL) |
| 1324 | { |
| 1325 | if (sec->strent == NULL) |
| 1326 | { |
| 1327 | sec->strent = ebl_strtabadd (strtab, sec->name, 0); |
| 1328 | ELF_CHECK (sec->strent != NULL, |
| 1329 | _("cannot add section name to string table: %s")); |
| 1330 | } |
| 1331 | unstripped_strent[elf_ndxscn (sec->outscn) - 1] = sec->strent; |
| 1332 | } |
| 1333 | |
| 1334 | /* Add names of sections we aren't touching. */ |
| 1335 | for (size_t i = 0; i < unstripped_shnum - 1; ++i) |
| 1336 | if (unstripped_strent[i] == NULL) |
| 1337 | { |
| 1338 | scn = elf_getscn (unstripped, i + 1); |
| 1339 | GElf_Shdr shdr_mem; |
| 1340 | GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 1341 | const char *name = get_section_name (i + 1, shdr, shstrtab); |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1342 | unstripped_strent[i] = ebl_strtabadd (strtab, name, 0); |
| 1343 | ELF_CHECK (unstripped_strent[i] != NULL, |
| 1344 | _("cannot add section name to string table: %s")); |
| 1345 | } |
| 1346 | else |
| 1347 | unstripped_strent[i] = NULL; |
| 1348 | |
| 1349 | /* Now finalize the string table so we can get offsets. */ |
| 1350 | strtab_data = elf_getdata (elf_getscn (unstripped, unstripped_shstrndx), |
| 1351 | NULL); |
| 1352 | ELF_CHECK (elf_flagdata (strtab_data, ELF_C_SET, ELF_F_DIRTY), |
| 1353 | _("cannot update section header string table data: %s")); |
| 1354 | ebl_strtabfinalize (strtab, strtab_data); |
| 1355 | |
| 1356 | /* Update the sh_name fields of sections we aren't modifying later. */ |
| 1357 | for (size_t i = 0; i < unstripped_shnum - 1; ++i) |
| 1358 | if (unstripped_strent[i] != NULL) |
| 1359 | { |
| 1360 | scn = elf_getscn (unstripped, i + 1); |
| 1361 | GElf_Shdr shdr_mem; |
| 1362 | GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); |
| 1363 | shdr->sh_name = ebl_strtaboffset (unstripped_strent[i]); |
| 1364 | if (i + 1 == unstripped_shstrndx) |
| 1365 | shdr->sh_size = strtab_data->d_size; |
| 1366 | ELF_CHECK (gelf_update_shdr (scn, shdr), |
| 1367 | _("cannot update section header: %s")); |
| 1368 | } |
| 1369 | } |
| 1370 | |
| 1371 | /* Get the updated section count. */ |
| 1372 | ELF_CHECK (elf_getshnum (unstripped, &unstripped_shnum) == 0, |
| 1373 | _("cannot get section count: %s")); |
| 1374 | |
| 1375 | bool placed[unstripped_shnum - 1]; |
| 1376 | memset (placed, 0, sizeof placed); |
| 1377 | |
| 1378 | /* Now update the output sections and copy in their data. */ |
| 1379 | GElf_Off offset = 0; |
| 1380 | for (const struct section *sec = sections; |
| 1381 | sec < §ions[stripped_shnum - 1]; |
| 1382 | ++sec) |
| 1383 | if (sec->outscn != NULL) |
| 1384 | { |
| 1385 | GElf_Shdr shdr_mem; |
| 1386 | GElf_Shdr *shdr = gelf_getshdr (sec->outscn, &shdr_mem); |
| 1387 | ELF_CHECK (shdr != NULL, _("cannot get section header: %s")); |
| 1388 | |
| 1389 | shdr_mem.sh_addr = sec->shdr.sh_addr; |
| 1390 | shdr_mem.sh_type = sec->shdr.sh_type; |
| 1391 | shdr_mem.sh_size = sec->shdr.sh_size; |
| 1392 | shdr_mem.sh_info = sec->shdr.sh_info; |
| 1393 | shdr_mem.sh_link = sec->shdr.sh_link; |
| 1394 | if (sec->shdr.sh_link != SHN_UNDEF) |
| 1395 | shdr_mem.sh_link = ndx_section[sec->shdr.sh_link - 1]; |
| 1396 | if (shdr_mem.sh_flags & SHF_INFO_LINK) |
| 1397 | shdr_mem.sh_info = ndx_section[sec->shdr.sh_info - 1]; |
| 1398 | |
| 1399 | if (strtab != NULL) |
| 1400 | shdr_mem.sh_name = ebl_strtaboffset (sec->strent); |
| 1401 | |
| 1402 | Elf_Data *indata = elf_getdata (sec->scn, NULL); |
| 1403 | ELF_CHECK (indata != NULL, _("cannot get section data: %s")); |
| 1404 | Elf_Data *outdata = elf_getdata (sec->outscn, NULL); |
| 1405 | ELF_CHECK (outdata != NULL, _("cannot copy section data: %s")); |
| 1406 | *outdata = *indata; |
| 1407 | elf_flagdata (outdata, ELF_C_SET, ELF_F_DIRTY); |
| 1408 | |
| 1409 | /* Preserve the file layout of the allocated sections. */ |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 1410 | if (stripped_ehdr->e_type != ET_REL && (shdr_mem.sh_flags & SHF_ALLOC)) |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1411 | { |
| 1412 | shdr_mem.sh_offset = sec->shdr.sh_offset; |
| 1413 | placed[elf_ndxscn (sec->outscn) - 1] = true; |
| 1414 | |
| 1415 | const GElf_Off end_offset = (shdr_mem.sh_offset |
| 1416 | + (shdr_mem.sh_type == SHT_NOBITS |
| 1417 | ? 0 : shdr_mem.sh_size)); |
| 1418 | if (end_offset > offset) |
| 1419 | offset = end_offset; |
| 1420 | } |
| 1421 | |
| 1422 | ELF_CHECK (gelf_update_shdr (sec->outscn, &shdr_mem), |
| 1423 | _("cannot update section header: %s")); |
| 1424 | |
| 1425 | if (shdr_mem.sh_type == SHT_SYMTAB || shdr_mem.sh_type == SHT_DYNSYM) |
| 1426 | { |
| 1427 | /* We must adjust all the section indices in the symbol table. */ |
| 1428 | |
| 1429 | Elf_Data *shndxdata = NULL; /* XXX */ |
| 1430 | |
| 1431 | for (size_t i = 1; i < shdr_mem.sh_size / shdr_mem.sh_entsize; ++i) |
| 1432 | { |
| 1433 | GElf_Sym sym_mem; |
| 1434 | GElf_Word shndx = SHN_UNDEF; |
| 1435 | GElf_Sym *sym = gelf_getsymshndx (outdata, shndxdata, |
| 1436 | i, &sym_mem, &shndx); |
| 1437 | ELF_CHECK (sym != NULL, |
| 1438 | _("cannot get symbol table entry: %s")); |
| 1439 | if (sym->st_shndx != SHN_XINDEX) |
| 1440 | shndx = sym->st_shndx; |
| 1441 | |
| 1442 | if (shndx != SHN_UNDEF && shndx < SHN_LORESERVE) |
| 1443 | { |
| 1444 | if (shndx >= stripped_shnum) |
| 1445 | error (EXIT_FAILURE, 0, |
| 1446 | _("symbol [%Zu] has invalid section index"), i); |
| 1447 | |
| 1448 | shndx = ndx_section[shndx - 1]; |
| 1449 | if (shndx < SHN_LORESERVE) |
| 1450 | { |
| 1451 | sym->st_shndx = shndx; |
| 1452 | shndx = SHN_UNDEF; |
| 1453 | } |
| 1454 | else |
| 1455 | sym->st_shndx = SHN_XINDEX; |
| 1456 | |
| 1457 | ELF_CHECK (gelf_update_symshndx (outdata, shndxdata, |
| 1458 | i, sym, shndx), |
| 1459 | _("cannot update symbol table: %s")); |
| 1460 | } |
| 1461 | } |
| 1462 | |
| 1463 | if (shdr_mem.sh_type == SHT_SYMTAB) |
| 1464 | stripped_symtab = sec; |
| 1465 | if (shdr_mem.sh_type == SHT_DYNSYM) |
| 1466 | stripped_dynsym = sec; |
| 1467 | } |
| 1468 | } |
| 1469 | |
| 1470 | /* We may need to update the symbol table. */ |
| 1471 | Elf_Data *symdata = NULL; |
| 1472 | struct Ebl_Strtab *symstrtab = NULL; |
| 1473 | Elf_Data *symstrdata = NULL; |
| 1474 | if (unstripped_symtab != NULL && (stripped_symtab != NULL |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 1475 | || check_prelink /* Section adjustments. */ |
| 1476 | || (stripped_ehdr->e_type != ET_REL |
| 1477 | && bias != 0))) |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1478 | { |
| 1479 | /* Merge the stripped file's symbol table into the unstripped one. */ |
| 1480 | const size_t stripped_nsym = (stripped_symtab == NULL ? 1 |
| 1481 | : (stripped_symtab->shdr.sh_size |
| 1482 | / stripped_symtab->shdr.sh_entsize)); |
| 1483 | |
| 1484 | GElf_Shdr shdr_mem; |
| 1485 | GElf_Shdr *shdr = gelf_getshdr (unstripped_symtab, &shdr_mem); |
| 1486 | ELF_CHECK (shdr != NULL, _("cannot get section header: %s")); |
| 1487 | const size_t unstripped_nsym = shdr->sh_size / shdr->sh_entsize; |
| 1488 | |
| 1489 | /* First collect all the symbols from both tables. */ |
| 1490 | |
| 1491 | const size_t total_syms = stripped_nsym - 1 + unstripped_nsym - 1; |
| 1492 | struct symbol symbols[total_syms]; |
| 1493 | size_t symndx_map[total_syms]; |
| 1494 | |
| 1495 | if (stripped_symtab != NULL) |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 1496 | collect_symbols (unstripped, stripped_symtab->scn, |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1497 | elf_getscn (stripped, stripped_symtab->shdr.sh_link), |
| 1498 | stripped_nsym, 0, ndx_section, |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 1499 | symbols, symndx_map, NULL); |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1500 | |
| 1501 | Elf_Scn *unstripped_strtab = elf_getscn (unstripped, shdr->sh_link); |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 1502 | collect_symbols (unstripped, |
| 1503 | unstripped_symtab, unstripped_strtab, unstripped_nsym, |
| 1504 | stripped_ehdr->e_type == ET_REL ? 0 : bias, NULL, |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1505 | &symbols[stripped_nsym - 1], |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 1506 | &symndx_map[stripped_nsym - 1], split_bss); |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1507 | |
| 1508 | /* Next, sort our array of all symbols. */ |
| 1509 | qsort (symbols, total_syms, sizeof symbols[0], compare_symbols); |
| 1510 | |
| 1511 | /* Now we can weed out the duplicates. Assign remaining symbols |
| 1512 | new slots, collecting a map from old indices to new. */ |
| 1513 | size_t nsym = *symbols[0].map = 1; |
| 1514 | for (size_t i = 1; i < total_syms; ++i) |
| 1515 | *symbols[i].map = (!compare_symbols (&symbols[i - 1], &symbols[i]) |
| 1516 | ? 0 /* This is a duplicate. */ |
| 1517 | : ++nsym); /* Allocate the next slot. */ |
| 1518 | |
| 1519 | /* Now we sort again, to determine the order in the output. */ |
| 1520 | qsort (symbols, total_syms, sizeof symbols[0], compare_symbols_output); |
| 1521 | |
| 1522 | if (nsym < total_syms) |
| 1523 | /* The discarded symbols are now at the end of the table. */ |
| 1524 | assert (*symbols[nsym].map == 0); |
| 1525 | |
| 1526 | /* Now a final pass updates the map with the final order, |
| 1527 | and builds up the new string table. */ |
| 1528 | symstrtab = ebl_strtabinit (true); |
| 1529 | for (size_t i = 0; i < nsym; ++i) |
| 1530 | { |
| 1531 | assert (*symbols[i].map != 0); |
| 1532 | *symbols[i].map = i; |
| 1533 | symbols[i].strent = ebl_strtabadd (symstrtab, symbols[i].name, 0); |
| 1534 | } |
| 1535 | |
| 1536 | /* Now we are ready to write the new symbol table. */ |
| 1537 | symdata = elf_getdata (unstripped_symtab, NULL); |
| 1538 | symstrdata = elf_getdata (unstripped_strtab, NULL); |
| 1539 | Elf_Data *shndxdata = NULL; /* XXX */ |
| 1540 | |
| 1541 | ebl_strtabfinalize (symstrtab, symstrdata); |
| 1542 | elf_flagdata (symstrdata, ELF_C_SET, ELF_F_DIRTY); |
| 1543 | |
| 1544 | shdr->sh_size = symdata->d_size = (1 + nsym) * shdr->sh_entsize; |
| 1545 | symdata->d_buf = xmalloc (symdata->d_size); |
| 1546 | |
| 1547 | GElf_Sym sym; |
| 1548 | memset (&sym, 0, sizeof sym); |
| 1549 | ELF_CHECK (gelf_update_symshndx (symdata, shndxdata, 0, &sym, SHN_UNDEF), |
| 1550 | _("cannot update symbol table: %s")); |
| 1551 | |
| 1552 | shdr->sh_info = 1; |
| 1553 | for (size_t i = 0; i < nsym; ++i) |
| 1554 | { |
| 1555 | struct symbol *s = &symbols[i]; |
| 1556 | |
| 1557 | /* Fill in the symbol details. */ |
| 1558 | sym.st_name = ebl_strtaboffset (s->strent); |
| 1559 | sym.st_value = s->value; /* Already biased to output address. */ |
| 1560 | sym.st_size = s->size; |
| 1561 | sym.st_shndx = s->shndx; /* Already mapped to output index. */ |
| 1562 | sym.st_info = s->info.info; |
| 1563 | sym.st_other = s->info.other; |
| 1564 | |
| 1565 | /* Keep track of the number of leading local symbols. */ |
| 1566 | if (GELF_ST_BIND (sym.st_info) == STB_LOCAL) |
| 1567 | { |
| 1568 | assert (shdr->sh_info == 1 + i); |
| 1569 | shdr->sh_info = 1 + i + 1; |
| 1570 | } |
| 1571 | |
| 1572 | ELF_CHECK (gelf_update_symshndx (symdata, shndxdata, 1 + i, |
| 1573 | &sym, SHN_UNDEF), |
| 1574 | _("cannot update symbol table: %s")); |
| 1575 | |
| 1576 | } |
| 1577 | elf_flagdata (symdata, ELF_C_SET, ELF_F_DIRTY); |
| 1578 | ELF_CHECK (gelf_update_shdr (unstripped_symtab, shdr), |
| 1579 | _("cannot update section header: %s")); |
| 1580 | |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 1581 | if (stripped_symtab != NULL) |
| 1582 | { |
| 1583 | /* Adjust any relocations referring to the old symbol table. */ |
| 1584 | const size_t old_sh_link = elf_ndxscn (stripped_symtab->scn); |
| 1585 | for (const struct section *sec = sections; |
| 1586 | sec < §ions[stripped_shnum - 1]; |
| 1587 | ++sec) |
| 1588 | if (sec->outscn != NULL && sec->shdr.sh_link == old_sh_link) |
| 1589 | adjust_relocs (sec->outscn, sec->scn, &sec->shdr, |
| 1590 | symndx_map, shdr); |
| 1591 | } |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1592 | |
| 1593 | /* Also adjust references to the other old symbol table. */ |
| 1594 | adjust_all_relocs (unstripped, unstripped_symtab, shdr, |
| 1595 | &symndx_map[stripped_nsym - 1]); |
| 1596 | } |
| 1597 | else if (stripped_symtab != NULL && stripped_shnum != unstripped_shnum) |
| 1598 | check_symtab_section_symbols (unstripped, stripped_symtab->scn, |
| 1599 | unstripped_shnum, unstripped_shstrndx, |
| 1600 | stripped_symtab->outscn, |
| 1601 | stripped_shnum, stripped_shstrndx, |
| 1602 | debuglink); |
| 1603 | |
| 1604 | if (stripped_dynsym != NULL) |
| 1605 | (void) check_symtab_section_symbols (unstripped, stripped_dynsym->outscn, |
| 1606 | unstripped_shnum, |
| 1607 | unstripped_shstrndx, |
| 1608 | stripped_dynsym->scn, stripped_shnum, |
| 1609 | stripped_shstrndx, debuglink); |
| 1610 | |
| 1611 | /* We need to preserve the layout of the stripped file so the |
| 1612 | phdrs will match up. This requires us to do our own layout of |
| 1613 | the added sections. We do manual layout even for ET_REL just |
| 1614 | so we can try to match what the original probably had. */ |
| 1615 | |
| 1616 | elf_flagelf (unstripped, ELF_C_SET, ELF_F_LAYOUT); |
| 1617 | |
| 1618 | if (offset == 0) |
| 1619 | /* For ET_REL we are starting the layout from scratch. */ |
| 1620 | offset = gelf_fsize (unstripped, ELF_T_EHDR, 1, EV_CURRENT); |
| 1621 | |
| 1622 | bool skip_reloc = false; |
| 1623 | do |
| 1624 | { |
| 1625 | skip_reloc = !skip_reloc; |
| 1626 | for (size_t i = 0; i < unstripped_shnum - 1; ++i) |
| 1627 | if (!placed[i]) |
| 1628 | { |
| 1629 | scn = elf_getscn (unstripped, 1 + i); |
| 1630 | |
| 1631 | GElf_Shdr shdr_mem; |
| 1632 | GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); |
| 1633 | ELF_CHECK (shdr != NULL, _("cannot get section header: %s")); |
| 1634 | |
| 1635 | if (skip_reloc |
| 1636 | && (shdr->sh_type == SHT_REL || shdr->sh_type == SHT_RELA)) |
| 1637 | continue; |
| 1638 | |
| 1639 | GElf_Off align = shdr->sh_addralign ?: 1; |
| 1640 | offset = (offset + align - 1) & -align; |
| 1641 | shdr->sh_offset = offset; |
| 1642 | if (shdr->sh_type != SHT_NOBITS) |
| 1643 | offset += shdr->sh_size; |
| 1644 | |
| 1645 | ELF_CHECK (gelf_update_shdr (scn, shdr), |
| 1646 | _("cannot update section header: %s")); |
| 1647 | |
| 1648 | if (unstripped_shstrndx == 1 + i) |
| 1649 | { |
| 1650 | /* Place the section headers immediately after |
| 1651 | .shstrtab, and update the ELF header. */ |
| 1652 | |
| 1653 | GElf_Ehdr ehdr_mem; |
| 1654 | GElf_Ehdr *ehdr = gelf_getehdr (unstripped, &ehdr_mem); |
| 1655 | ELF_CHECK (ehdr != NULL, _("cannot get ELF header: %s")); |
| 1656 | |
| 1657 | GElf_Off sh_align = gelf_getclass (unstripped) * 4; |
| 1658 | offset = (offset + sh_align - 1) & -sh_align; |
| 1659 | ehdr->e_shnum = unstripped_shnum; |
| 1660 | ehdr->e_shoff = offset; |
| 1661 | offset += unstripped_shnum * ehdr->e_shentsize; |
| 1662 | ELF_CHECK (gelf_update_ehdr (unstripped, ehdr), |
| 1663 | _("cannot update ELF header: %s")); |
| 1664 | } |
| 1665 | |
| 1666 | placed[i] = true; |
| 1667 | } |
| 1668 | } while (skip_reloc); |
| 1669 | |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 1670 | if (stripped_ehdr->e_phnum > 0) |
| 1671 | ELF_CHECK (gelf_newphdr (unstripped, stripped_ehdr->e_phnum), |
| 1672 | _("cannot create program headers: %s")); |
| 1673 | |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1674 | /* Copy each program header from the stripped file. */ |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 1675 | for (uint_fast16_t i = 0; i < stripped_ehdr->e_phnum; ++i) |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1676 | { |
| 1677 | GElf_Phdr phdr_mem; |
| 1678 | GElf_Phdr *phdr = gelf_getphdr (stripped, i, &phdr_mem); |
| 1679 | ELF_CHECK (phdr != NULL, _("cannot get program header: %s")); |
| 1680 | |
| 1681 | ELF_CHECK (gelf_update_phdr (unstripped, i, phdr), |
| 1682 | _("cannot update program header: %s")); |
| 1683 | } |
| 1684 | |
| 1685 | /* Finally, write out the file. */ |
| 1686 | ELF_CHECK (elf_update (unstripped, ELF_C_WRITE) > 0, |
| 1687 | _("cannot write output file: %s")); |
| 1688 | |
| 1689 | if (strtab != NULL) |
| 1690 | { |
| 1691 | ebl_strtabfree (strtab); |
| 1692 | free (strtab_data->d_buf); |
| 1693 | } |
| 1694 | |
| 1695 | if (symdata != NULL) |
| 1696 | free (symdata->d_buf); |
| 1697 | if (symstrtab != NULL) |
| 1698 | { |
| 1699 | ebl_strtabfree (symstrtab); |
| 1700 | free (symstrdata->d_buf); |
| 1701 | } |
| 1702 | } |
| 1703 | |
| 1704 | /* Process one pair of files, already opened. */ |
| 1705 | static void |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 1706 | handle_file (const char *output_file, bool create_dirs, |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1707 | Elf *stripped, const GElf_Ehdr *stripped_ehdr, |
| 1708 | Elf *unstripped) |
| 1709 | { |
| 1710 | /* Determine the address bias between the debuginfo file and the main |
| 1711 | file, which may have been modified by prelinking. */ |
| 1712 | GElf_Addr bias = 0; |
| 1713 | if (unstripped != NULL) |
| 1714 | for (uint_fast16_t i = 0; i < stripped_ehdr->e_phnum; ++i) |
| 1715 | { |
| 1716 | GElf_Phdr phdr_mem; |
| 1717 | GElf_Phdr *phdr = gelf_getphdr (stripped, i, &phdr_mem); |
| 1718 | ELF_CHECK (phdr != NULL, _("cannot get program header: %s")); |
| 1719 | if (phdr->p_type == PT_LOAD) |
| 1720 | { |
| 1721 | GElf_Phdr unstripped_phdr_mem; |
| 1722 | GElf_Phdr *unstripped_phdr = gelf_getphdr (unstripped, i, |
| 1723 | &unstripped_phdr_mem); |
| 1724 | ELF_CHECK (unstripped_phdr != NULL, |
| 1725 | _("cannot get program header: %s")); |
| 1726 | bias = phdr->p_vaddr - unstripped_phdr->p_vaddr; |
| 1727 | break; |
| 1728 | } |
| 1729 | } |
| 1730 | |
| 1731 | /* One day we could adjust all the DWARF data (like prelink itself does). */ |
| 1732 | if (bias != 0) |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 1733 | { |
| 1734 | if (output_file == NULL) |
| 1735 | error (0, 0, _("\ |
| 1736 | DWARF data not adjusted for prelinking bias; consider prelink -u")); |
| 1737 | else |
| 1738 | error (0, 0, _("\ |
| 1739 | DWARF data in '%s' not adjusted for prelinking bias; consider prelink -u"), |
| 1740 | output_file); |
| 1741 | } |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1742 | |
| 1743 | if (output_file == NULL) |
| 1744 | /* Modify the unstripped file in place. */ |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 1745 | copy_elided_sections (unstripped, stripped, stripped_ehdr, bias); |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1746 | else |
| 1747 | { |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 1748 | if (create_dirs) |
| 1749 | make_directories (output_file); |
| 1750 | |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1751 | /* Copy the unstripped file and then modify it. */ |
| 1752 | int outfd = open64 (output_file, O_RDWR | O_CREAT, |
| 1753 | stripped_ehdr->e_type == ET_REL ? 0666 : 0777); |
| 1754 | if (outfd < 0) |
| 1755 | error (EXIT_FAILURE, errno, _("cannot open '%s'"), output_file); |
| 1756 | Elf *outelf = elf_begin (outfd, ELF_C_WRITE, NULL); |
| 1757 | ELF_CHECK (outelf != NULL, _("cannot create ELF descriptor: %s")); |
| 1758 | |
| 1759 | if (unstripped == NULL) |
| 1760 | { |
| 1761 | /* Actually, we are just copying out the main file as it is. */ |
| 1762 | copy_elf (outelf, stripped); |
| 1763 | if (stripped_ehdr->e_type != ET_REL) |
| 1764 | elf_flagelf (outelf, ELF_C_SET, ELF_F_LAYOUT); |
| 1765 | ELF_CHECK (elf_update (outelf, ELF_C_WRITE) > 0, |
| 1766 | _("cannot write output file: %s")); |
| 1767 | } |
| 1768 | else |
| 1769 | { |
| 1770 | copy_elf (outelf, unstripped); |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 1771 | copy_elided_sections (outelf, stripped, stripped_ehdr, bias); |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1772 | } |
| 1773 | |
| 1774 | elf_end (outelf); |
| 1775 | close (outfd); |
| 1776 | } |
| 1777 | } |
| 1778 | |
| 1779 | static int |
| 1780 | open_file (const char *file, bool writable) |
| 1781 | { |
| 1782 | int fd = open64 (file, writable ? O_RDWR : O_RDONLY); |
| 1783 | if (fd < 0) |
| 1784 | error (EXIT_FAILURE, errno, _("cannot open '%s'"), file); |
| 1785 | return fd; |
| 1786 | } |
| 1787 | |
| 1788 | /* Handle a pair of files we need to open by name. */ |
| 1789 | static void |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 1790 | handle_explicit_files (const char *output_file, bool create_dirs, |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1791 | const char *stripped_file, const char *unstripped_file) |
| 1792 | { |
| 1793 | int stripped_fd = open_file (stripped_file, false); |
| 1794 | Elf *stripped = elf_begin (stripped_fd, ELF_C_READ, NULL); |
| 1795 | GElf_Ehdr stripped_ehdr; |
| 1796 | ELF_CHECK (gelf_getehdr (stripped, &stripped_ehdr), |
| 1797 | _("cannot create ELF descriptor: %s")); |
| 1798 | |
| 1799 | int unstripped_fd = -1; |
| 1800 | Elf *unstripped = NULL; |
| 1801 | if (unstripped_file != NULL) |
| 1802 | { |
| 1803 | unstripped_fd = open_file (unstripped_file, output_file == NULL); |
| 1804 | unstripped = elf_begin (unstripped_fd, |
| 1805 | (output_file == NULL ? ELF_C_RDWR : ELF_C_READ), |
| 1806 | NULL); |
| 1807 | GElf_Ehdr unstripped_ehdr; |
| 1808 | ELF_CHECK (gelf_getehdr (unstripped, &unstripped_ehdr), |
| 1809 | _("cannot create ELF descriptor: %s")); |
| 1810 | |
| 1811 | if (memcmp (stripped_ehdr.e_ident, unstripped_ehdr.e_ident, EI_NIDENT) |
| 1812 | || stripped_ehdr.e_type != unstripped_ehdr.e_type |
| 1813 | || stripped_ehdr.e_machine != unstripped_ehdr.e_machine |
| 1814 | || stripped_ehdr.e_phnum != unstripped_ehdr.e_phnum) |
| 1815 | error (EXIT_FAILURE, 0, _("'%s' and '%s' do not seem to match"), |
| 1816 | stripped_file, unstripped_file); |
| 1817 | } |
| 1818 | |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 1819 | handle_file (output_file, create_dirs, stripped, &stripped_ehdr, unstripped); |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1820 | |
| 1821 | elf_end (stripped); |
| 1822 | close (stripped_fd); |
| 1823 | |
| 1824 | elf_end (unstripped); |
| 1825 | close (unstripped_fd); |
| 1826 | } |
| 1827 | |
| 1828 | |
| 1829 | /* Handle a pair of files opened implicitly by libdwfl for one module. */ |
| 1830 | static void |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 1831 | handle_dwfl_module (const char *output_file, bool create_dirs, |
| 1832 | Dwfl_Module *mod, bool all, bool ignore) |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1833 | { |
| 1834 | GElf_Addr bias; |
| 1835 | Elf *stripped = dwfl_module_getelf (mod, &bias); |
| 1836 | if (stripped == NULL) |
| 1837 | { |
| 1838 | if (ignore) |
| 1839 | return; |
| 1840 | |
| 1841 | const char *file; |
| 1842 | const char *modname = dwfl_module_info (mod, NULL, NULL, NULL, |
| 1843 | NULL, NULL, &file, NULL); |
| 1844 | if (file == NULL) |
| 1845 | error (EXIT_FAILURE, 0, |
| 1846 | _("cannot find stripped file for module '%s': %s"), |
| 1847 | modname, dwfl_errmsg (-1)); |
| 1848 | else |
| 1849 | error (EXIT_FAILURE, 0, |
| 1850 | _("cannot open stripped file '%s' for module '%s': %s"), |
| 1851 | modname, file, dwfl_errmsg (-1)); |
| 1852 | } |
| 1853 | |
| 1854 | Elf *debug = dwarf_getelf (dwfl_module_getdwarf (mod, &bias)); |
| 1855 | if (debug == NULL && !all) |
| 1856 | { |
| 1857 | if (ignore) |
| 1858 | return; |
| 1859 | |
| 1860 | const char *file; |
| 1861 | const char *modname = dwfl_module_info (mod, NULL, NULL, NULL, |
| 1862 | NULL, NULL, NULL, &file); |
| 1863 | if (file == NULL) |
| 1864 | error (EXIT_FAILURE, 0, |
| 1865 | _("cannot find debug file for module '%s': %s"), |
| 1866 | modname, dwfl_errmsg (-1)); |
| 1867 | else |
| 1868 | error (EXIT_FAILURE, 0, |
| 1869 | _("cannot open debug file '%s' for module '%s': %s"), |
| 1870 | modname, file, dwfl_errmsg (-1)); |
| 1871 | } |
| 1872 | |
| 1873 | if (debug == stripped) |
| 1874 | { |
| 1875 | if (all) |
| 1876 | debug = NULL; |
| 1877 | else |
| 1878 | { |
| 1879 | const char *file; |
| 1880 | const char *modname = dwfl_module_info (mod, NULL, NULL, NULL, |
| 1881 | NULL, NULL, &file, NULL); |
| 1882 | error (EXIT_FAILURE, 0, _("module '%s' file '%s' is not stripped"), |
| 1883 | modname, file); |
| 1884 | } |
| 1885 | } |
| 1886 | |
| 1887 | GElf_Ehdr stripped_ehdr; |
| 1888 | ELF_CHECK (gelf_getehdr (stripped, &stripped_ehdr), |
| 1889 | _("cannot create ELF descriptor: %s")); |
| 1890 | |
| 1891 | if (stripped_ehdr.e_type == ET_REL) |
| 1892 | { |
| 1893 | /* We can't use the Elf handles already open, |
| 1894 | because the DWARF sections have been relocated. */ |
| 1895 | |
| 1896 | const char *stripped_file = NULL; |
| 1897 | const char *unstripped_file = NULL; |
| 1898 | (void) dwfl_module_info (mod, NULL, NULL, NULL, NULL, NULL, |
| 1899 | &stripped_file, &unstripped_file); |
| 1900 | |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 1901 | handle_explicit_files (output_file, create_dirs, |
| 1902 | stripped_file, unstripped_file); |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1903 | } |
| 1904 | else |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 1905 | handle_file (output_file, create_dirs, stripped, &stripped_ehdr, debug); |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1906 | } |
| 1907 | |
| 1908 | /* Handle one module being written to the output directory. */ |
| 1909 | static void |
| 1910 | handle_output_dir_module (const char *output_dir, Dwfl_Module *mod, |
| 1911 | bool all, bool ignore, bool modnames) |
| 1912 | { |
| 1913 | if (! modnames) |
| 1914 | { |
| 1915 | /* Make sure we've searched for the ELF file. */ |
| 1916 | GElf_Addr bias; |
| 1917 | (void) dwfl_module_getelf (mod, &bias); |
| 1918 | } |
| 1919 | |
| 1920 | const char *file; |
| 1921 | const char *name = dwfl_module_info (mod, NULL, NULL, NULL, |
| 1922 | NULL, NULL, &file, NULL); |
| 1923 | |
| 1924 | if (file == NULL && ignore) |
| 1925 | return; |
| 1926 | |
| 1927 | char *output_file; |
| 1928 | if (asprintf (&output_file, "%s/%s", output_dir, modnames ? name : file) < 0) |
| 1929 | error (EXIT_FAILURE, 0, _("memory exhausted")); |
| 1930 | |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 1931 | handle_dwfl_module (output_file, true, mod, all, ignore); |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1932 | } |
| 1933 | |
| 1934 | |
| 1935 | struct match_module_info |
| 1936 | { |
| 1937 | char **patterns; |
| 1938 | Dwfl_Module *found; |
| 1939 | bool match_files; |
| 1940 | }; |
| 1941 | |
| 1942 | static int |
| 1943 | match_module (Dwfl_Module *mod, |
| 1944 | void **userdata __attribute__ ((unused)), |
| 1945 | const char *name, |
| 1946 | Dwarf_Addr start __attribute__ ((unused)), |
| 1947 | void *arg) |
| 1948 | { |
| 1949 | struct match_module_info *info = arg; |
| 1950 | |
| 1951 | if (info->patterns[0] == NULL) /* Match all. */ |
| 1952 | { |
| 1953 | match: |
| 1954 | info->found = mod; |
| 1955 | return DWARF_CB_ABORT; |
| 1956 | } |
| 1957 | |
| 1958 | if (info->match_files) |
| 1959 | { |
| 1960 | /* Make sure we've searched for the ELF file. */ |
| 1961 | GElf_Addr bias; |
| 1962 | (void) dwfl_module_getelf (mod, &bias); |
| 1963 | |
| 1964 | const char *file; |
| 1965 | const char *check = dwfl_module_info (mod, NULL, NULL, NULL, |
| 1966 | NULL, NULL, &file, NULL); |
| 1967 | assert (check == name); |
| 1968 | if (file == NULL) |
| 1969 | return DWARF_CB_OK; |
| 1970 | |
| 1971 | name = file; |
| 1972 | } |
| 1973 | |
| 1974 | for (char **p = info->patterns; *p != NULL; ++p) |
| 1975 | if (fnmatch (*p, name, 0) == 0) |
| 1976 | goto match; |
| 1977 | |
| 1978 | return DWARF_CB_OK; |
| 1979 | } |
| 1980 | |
| 1981 | /* Handle files opened implicitly via libdwfl. */ |
| 1982 | static void |
| 1983 | handle_implicit_modules (const struct arg_info *info) |
| 1984 | { |
| 1985 | struct match_module_info mmi = { info->args, NULL, info->match_files }; |
| 1986 | inline ptrdiff_t next (ptrdiff_t offset) |
| 1987 | { |
| 1988 | return dwfl_getmodules (info->dwfl, &match_module, &mmi, offset); |
| 1989 | } |
| 1990 | ptrdiff_t offset = next (0); |
| 1991 | if (offset == 0) |
| 1992 | error (EXIT_FAILURE, 0, _("no matching modules found")); |
| 1993 | |
| 1994 | if (info->output_dir == NULL) |
| 1995 | { |
| 1996 | if (next (offset) != 0) |
| 1997 | error (EXIT_FAILURE, 0, _("matched more than one module")); |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 1998 | handle_dwfl_module (info->output_file, false, mmi.found, |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 1999 | info->all, info->ignore); |
| 2000 | } |
| 2001 | else |
| 2002 | do |
| 2003 | handle_output_dir_module (info->output_dir, mmi.found, |
| 2004 | info->all, info->ignore, info->modnames); |
| 2005 | while ((offset = next (offset)) > 0); |
| 2006 | } |
| 2007 | |
| 2008 | int |
| 2009 | main (int argc, char **argv) |
| 2010 | { |
| 2011 | /* Make memory leak detection possible. */ |
| 2012 | mtrace (); |
| 2013 | |
| 2014 | /* We use no threads here which can interfere with handling a stream. */ |
| 2015 | __fsetlocking (stdin, FSETLOCKING_BYCALLER); |
| 2016 | __fsetlocking (stdout, FSETLOCKING_BYCALLER); |
| 2017 | __fsetlocking (stderr, FSETLOCKING_BYCALLER); |
| 2018 | |
| 2019 | /* Set locale. */ |
| 2020 | setlocale (LC_ALL, ""); |
| 2021 | |
| 2022 | /* Make sure the message catalog can be found. */ |
Ulrich Drepper | b024386 | 2007-06-06 00:09:36 +0000 | [diff] [blame^] | 2023 | bindtextdomain (PACKAGE_TARNAME, LOCALEDIR); |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 2024 | |
| 2025 | /* Initialize the message catalog. */ |
Ulrich Drepper | b024386 | 2007-06-06 00:09:36 +0000 | [diff] [blame^] | 2026 | textdomain (PACKAGE_TARNAME); |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 2027 | |
| 2028 | /* Parse and process arguments. */ |
| 2029 | const struct argp_child argp_children[] = |
| 2030 | { |
| 2031 | { |
| 2032 | .argp = dwfl_standard_argp (), |
| 2033 | .header = N_("Input selection options:"), |
| 2034 | .group = 1, |
| 2035 | }, |
| 2036 | { .argp = NULL }, |
| 2037 | }; |
| 2038 | const struct argp argp = |
| 2039 | { |
| 2040 | .options = options, |
| 2041 | .parser = parse_opt, |
| 2042 | .children = argp_children, |
| 2043 | .args_doc = N_("STRIPPED-FILE DEBUG-FILE\n[MODULE...]"), |
| 2044 | .doc = N_("\ |
| 2045 | Combine stripped files with separate symbols and debug information.\v\ |
| 2046 | The first form puts the result in DEBUG-FILE if -o was not given.\n\ |
| 2047 | \n\ |
| 2048 | MODULE arguments give file name patterns matching modules to process.\n\ |
| 2049 | With -f these match the file name of the main (stripped) file \ |
| 2050 | (slashes are never special), otherwise they match the simple module names. \ |
| 2051 | With no arguments, process all modules found.\n\ |
| 2052 | \n\ |
| 2053 | Multiple modules are written to files under OUTPUT-DIRECTORY, \ |
| 2054 | creating subdirectories as needed. \ |
| 2055 | With -m these files have simple module names, otherwise they have the \ |
| 2056 | name of the main file complete with directory underneath OUTPUT-DIRECTORY.") |
| 2057 | }; |
| 2058 | |
| 2059 | int remaining; |
| 2060 | struct arg_info info = { .args = NULL }; |
| 2061 | error_t result = argp_parse (&argp, argc, argv, 0, &remaining, &info); |
| 2062 | if (result == ENOSYS) |
| 2063 | assert (info.dwfl == NULL); |
| 2064 | else if (result) |
| 2065 | return EXIT_FAILURE; |
| 2066 | assert (info.args != NULL); |
| 2067 | |
| 2068 | /* Tell the library which version we are expecting. */ |
| 2069 | elf_version (EV_CURRENT); |
| 2070 | |
| 2071 | if (info.dwfl == NULL) |
| 2072 | { |
| 2073 | assert (result == ENOSYS); |
| 2074 | |
| 2075 | if (info.output_dir != NULL) |
| 2076 | { |
| 2077 | char *file; |
| 2078 | if (asprintf (&file, "%s/%s", info.output_dir, info.args[0]) < 0) |
| 2079 | error (EXIT_FAILURE, 0, _("memory exhausted")); |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 2080 | handle_explicit_files (file, true, info.args[0], info.args[1]); |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 2081 | free (file); |
| 2082 | } |
| 2083 | else |
Roland McGrath | 9aa8ef7 | 2007-05-18 08:59:43 +0000 | [diff] [blame] | 2084 | handle_explicit_files (info.output_file, false, |
| 2085 | info.args[0], info.args[1]); |
Roland McGrath | 4be1524 | 2007-04-25 03:09:33 +0000 | [diff] [blame] | 2086 | } |
| 2087 | else |
| 2088 | { |
| 2089 | /* parse_opt checked this. */ |
| 2090 | assert (info.output_file != NULL || info.output_dir != NULL); |
| 2091 | |
| 2092 | handle_implicit_modules (&info); |
| 2093 | |
| 2094 | dwfl_end (info.dwfl); |
| 2095 | } |
| 2096 | |
| 2097 | return 0; |
| 2098 | } |