1 /*- 2 * Copyright (c) 2007-2013 Kai Wang 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/param.h> 28 #include <sys/stat.h> 29 30 #include <err.h> 31 #include <errno.h> 32 #include <fcntl.h> 33 #include <getopt.h> 34 #include <libelftc.h> 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <string.h> 38 #include <unistd.h> 39 40 #include "elfcopy.h" 41 42 ELFTC_VCSID("$Id: main.c 3757 2019-06-28 01:15:28Z emaste $"); 43 44 enum options 45 { 46 ECP_ADD_GNU_DEBUGLINK, 47 ECP_ADD_SECTION, 48 ECP_CHANGE_ADDR, 49 ECP_CHANGE_SEC_ADDR, 50 ECP_CHANGE_SEC_LMA, 51 ECP_CHANGE_SEC_VMA, 52 ECP_CHANGE_START, 53 ECP_CHANGE_WARN, 54 ECP_GAP_FILL, 55 ECP_GLOBALIZE_SYMBOL, 56 ECP_GLOBALIZE_SYMBOLS, 57 ECP_KEEP_SYMBOLS, 58 ECP_KEEP_GLOBAL_SYMBOLS, 59 ECP_LOCALIZE_HIDDEN, 60 ECP_LOCALIZE_SYMBOLS, 61 ECP_NO_CHANGE_WARN, 62 ECP_ONLY_DEBUG, 63 ECP_ONLY_DWO, 64 ECP_PAD_TO, 65 ECP_PREFIX_ALLOC, 66 ECP_PREFIX_SEC, 67 ECP_PREFIX_SYM, 68 ECP_REDEF_SYMBOL, 69 ECP_REDEF_SYMBOLS, 70 ECP_RENAME_SECTION, 71 ECP_SET_OSABI, 72 ECP_SET_SEC_FLAGS, 73 ECP_SET_START, 74 ECP_SREC_FORCE_S3, 75 ECP_SREC_LEN, 76 ECP_STRIP_DWO, 77 ECP_STRIP_SYMBOLS, 78 ECP_STRIP_UNNEEDED, 79 ECP_WEAKEN_ALL, 80 ECP_WEAKEN_SYMBOLS 81 }; 82 83 static struct option mcs_longopts[] = 84 { 85 { "help", no_argument, NULL, 'h' }, 86 { "version", no_argument, NULL, 'V' }, 87 { NULL, 0, NULL, 0 } 88 }; 89 90 static struct option strip_longopts[] = 91 { 92 {"discard-all", no_argument, NULL, 'x'}, 93 {"discard-locals", no_argument, NULL, 'X'}, 94 {"help", no_argument, NULL, 'h'}, 95 {"input-target", required_argument, NULL, 'I'}, 96 {"keep-symbol", required_argument, NULL, 'K'}, 97 {"only-keep-debug", no_argument, NULL, ECP_ONLY_DEBUG}, 98 {"output-file", required_argument, NULL, 'o'}, 99 {"output-target", required_argument, NULL, 'O'}, 100 {"preserve-dates", no_argument, NULL, 'p'}, 101 {"remove-section", required_argument, NULL, 'R'}, 102 {"strip-all", no_argument, NULL, 's'}, 103 {"strip-debug", no_argument, NULL, 'S'}, 104 {"strip-symbol", required_argument, NULL, 'N'}, 105 {"strip-unneeded", no_argument, NULL, ECP_STRIP_UNNEEDED}, 106 {"version", no_argument, NULL, 'V'}, 107 {"wildcard", no_argument, NULL, 'w'}, 108 {NULL, 0, NULL, 0} 109 }; 110 111 static struct option elfcopy_longopts[] = 112 { 113 {"add-gnu-debuglink", required_argument, NULL, ECP_ADD_GNU_DEBUGLINK}, 114 {"add-section", required_argument, NULL, ECP_ADD_SECTION}, 115 {"adjust-section-vma", required_argument, NULL, ECP_CHANGE_SEC_ADDR}, 116 {"adjust-vma", required_argument, NULL, ECP_CHANGE_ADDR}, 117 {"adjust-start", required_argument, NULL, ECP_CHANGE_START}, 118 {"adjust-warnings", no_argument, NULL, ECP_CHANGE_WARN}, 119 {"binary-architecture", required_argument, NULL, 'B'}, 120 {"change-addresses", required_argument, NULL, ECP_CHANGE_ADDR}, 121 {"change-section-address", required_argument, NULL, 122 ECP_CHANGE_SEC_ADDR}, 123 {"change-section-lma", required_argument, NULL, ECP_CHANGE_SEC_LMA}, 124 {"change-section-vma", required_argument, NULL, ECP_CHANGE_SEC_VMA}, 125 {"change-start", required_argument, NULL, ECP_CHANGE_START}, 126 {"change-warnings", no_argument, NULL, ECP_CHANGE_WARN}, 127 {"discard-all", no_argument, NULL, 'x'}, 128 {"discard-locals", no_argument, NULL, 'X'}, 129 {"extract-dwo", no_argument, NULL, ECP_ONLY_DWO}, 130 {"gap-fill", required_argument, NULL, ECP_GAP_FILL}, 131 {"globalize-symbol", required_argument, NULL, ECP_GLOBALIZE_SYMBOL}, 132 {"globalize-symbols", required_argument, NULL, ECP_GLOBALIZE_SYMBOLS}, 133 {"help", no_argument, NULL, 'h'}, 134 {"input-target", required_argument, NULL, 'I'}, 135 {"keep-symbol", required_argument, NULL, 'K'}, 136 {"keep-symbols", required_argument, NULL, ECP_KEEP_SYMBOLS}, 137 {"keep-global-symbol", required_argument, NULL, 'G'}, 138 {"keep-global-symbols", required_argument, NULL, 139 ECP_KEEP_GLOBAL_SYMBOLS}, 140 {"localize-hidden", no_argument, NULL, ECP_LOCALIZE_HIDDEN}, 141 {"localize-symbol", required_argument, NULL, 'L'}, 142 {"localize-symbols", required_argument, NULL, ECP_LOCALIZE_SYMBOLS}, 143 {"no-adjust-warnings", no_argument, NULL, ECP_NO_CHANGE_WARN}, 144 {"no-change-warnings", no_argument, NULL, ECP_NO_CHANGE_WARN}, 145 {"only-keep-debug", no_argument, NULL, ECP_ONLY_DEBUG}, 146 {"only-section", required_argument, NULL, 'j'}, 147 {"osabi", required_argument, NULL, ECP_SET_OSABI}, 148 {"output-target", required_argument, NULL, 'O'}, 149 {"pad-to", required_argument, NULL, ECP_PAD_TO}, 150 {"preserve-dates", no_argument, NULL, 'p'}, 151 {"prefix-alloc-sections", required_argument, NULL, ECP_PREFIX_ALLOC}, 152 {"prefix-sections", required_argument, NULL, ECP_PREFIX_SEC}, 153 {"prefix-symbols", required_argument, NULL, ECP_PREFIX_SYM}, 154 {"redefine-sym", required_argument, NULL, ECP_REDEF_SYMBOL}, 155 {"redefine-syms", required_argument, NULL, ECP_REDEF_SYMBOLS}, 156 {"remove-section", required_argument, NULL, 'R'}, 157 {"rename-section", required_argument, NULL, ECP_RENAME_SECTION}, 158 {"set-section-flags", required_argument, NULL, ECP_SET_SEC_FLAGS}, 159 {"set-start", required_argument, NULL, ECP_SET_START}, 160 {"srec-forceS3", no_argument, NULL, ECP_SREC_FORCE_S3}, 161 {"srec-len", required_argument, NULL, ECP_SREC_LEN}, 162 {"strip-all", no_argument, NULL, 'S'}, 163 {"strip-debug", no_argument, 0, 'g'}, 164 {"strip-dwo", no_argument, NULL, ECP_STRIP_DWO}, 165 {"strip-symbol", required_argument, NULL, 'N'}, 166 {"strip-symbols", required_argument, NULL, ECP_STRIP_SYMBOLS}, 167 {"strip-unneeded", no_argument, NULL, ECP_STRIP_UNNEEDED}, 168 {"version", no_argument, NULL, 'V'}, 169 {"weaken", no_argument, NULL, ECP_WEAKEN_ALL}, 170 {"weaken-symbol", required_argument, NULL, 'W'}, 171 {"weaken-symbols", required_argument, NULL, ECP_WEAKEN_SYMBOLS}, 172 {"wildcard", no_argument, NULL, 'w'}, 173 {NULL, 0, NULL, 0} 174 }; 175 176 static struct { 177 const char *name; 178 int value; 179 } sec_flags[] = { 180 {"alloc", SF_ALLOC}, 181 {"load", SF_LOAD}, 182 {"noload", SF_NOLOAD}, 183 {"readonly", SF_READONLY}, 184 {"debug", SF_DEBUG}, 185 {"code", SF_CODE}, 186 {"data", SF_DATA}, 187 {"rom", SF_ROM}, 188 {"share", SF_SHARED}, 189 {"contents", SF_CONTENTS}, 190 {NULL, 0} 191 }; 192 193 static struct { 194 const char *name; 195 int abi; 196 } osabis[] = { 197 {"sysv", ELFOSABI_SYSV}, 198 {"hpus", ELFOSABI_HPUX}, 199 {"netbsd", ELFOSABI_NETBSD}, 200 {"linux", ELFOSABI_LINUX}, 201 {"hurd", ELFOSABI_HURD}, 202 {"86open", ELFOSABI_86OPEN}, 203 {"solaris", ELFOSABI_SOLARIS}, 204 {"aix", ELFOSABI_AIX}, 205 {"irix", ELFOSABI_IRIX}, 206 {"freebsd", ELFOSABI_FREEBSD}, 207 {"tru64", ELFOSABI_TRU64}, 208 {"modesto", ELFOSABI_MODESTO}, 209 {"openbsd", ELFOSABI_OPENBSD}, 210 {"openvms", ELFOSABI_OPENVMS}, 211 {"nsk", ELFOSABI_NSK}, 212 {"cloudabi", ELFOSABI_CLOUDABI}, 213 {"arm", ELFOSABI_ARM}, 214 {"standalone", ELFOSABI_STANDALONE}, 215 {NULL, 0} 216 }; 217 218 static int copy_from_tempfile(const char *src, const char *dst, 219 int infd, int *outfd, int in_place); 220 static void create_file(struct elfcopy *ecp, const char *src, 221 const char *dst); 222 static void elfcopy_main(struct elfcopy *ecp, int argc, char **argv); 223 static void elfcopy_usage(void); 224 static void mcs_main(struct elfcopy *ecp, int argc, char **argv); 225 static void mcs_usage(void); 226 static void parse_sec_address_op(struct elfcopy *ecp, int optnum, 227 const char *optname, char *s); 228 static void parse_sec_flags(struct sec_action *sac, char *s); 229 static void parse_symlist_file(struct elfcopy *ecp, const char *fn, 230 unsigned int op); 231 static void print_version(void); 232 static void set_input_target(struct elfcopy *ecp, const char *target_name); 233 static void set_osabi(struct elfcopy *ecp, const char *abi); 234 static void set_output_target(struct elfcopy *ecp, const char *target_name); 235 static void strip_main(struct elfcopy *ecp, int argc, char **argv); 236 static void strip_usage(void); 237 238 /* 239 * An ELF object usually has a structure described by the 240 * diagram below. 241 * _____________ 242 * | | 243 * | NULL | <- always a SHT_NULL section 244 * |_____________| 245 * | | 246 * | .interp | 247 * |_____________| 248 * | | 249 * | ... | 250 * |_____________| 251 * | | 252 * | .text | 253 * |_____________| 254 * | | 255 * | ... | 256 * |_____________| 257 * | | 258 * | .comment | <- above(include) this: normal sections 259 * |_____________| 260 * | | 261 * | add sections| <- unloadable sections added by --add-section 262 * |_____________| 263 * | | 264 * | .shstrtab | <- section name string table 265 * |_____________| 266 * | | 267 * | shdrs | <- section header table 268 * |_____________| 269 * | | 270 * | .symtab | <- symbol table, if any 271 * |_____________| 272 * | | 273 * | .strtab | <- symbol name string table, if any 274 * |_____________| 275 * | | 276 * | .rel.text | <- relocation info for .o files. 277 * |_____________| 278 */ 279 void 280 create_elf(struct elfcopy *ecp) 281 { 282 struct section *shtab; 283 GElf_Ehdr ieh; 284 GElf_Ehdr oeh; 285 size_t ishnum; 286 287 ecp->flags |= SYMTAB_INTACT; 288 ecp->flags &= ~SYMTAB_EXIST; 289 290 /* Create EHDR. */ 291 if (gelf_getehdr(ecp->ein, &ieh) == NULL) 292 errx(EXIT_FAILURE, "gelf_getehdr() failed: %s", 293 elf_errmsg(-1)); 294 if ((ecp->iec = gelf_getclass(ecp->ein)) == ELFCLASSNONE) 295 errx(EXIT_FAILURE, "getclass() failed: %s", 296 elf_errmsg(-1)); 297 298 if (ecp->oec == ELFCLASSNONE) 299 ecp->oec = ecp->iec; 300 if (ecp->oed == ELFDATANONE) 301 ecp->oed = ieh.e_ident[EI_DATA]; 302 303 if (gelf_newehdr(ecp->eout, ecp->oec) == NULL) 304 errx(EXIT_FAILURE, "gelf_newehdr failed: %s", 305 elf_errmsg(-1)); 306 if (gelf_getehdr(ecp->eout, &oeh) == NULL) 307 errx(EXIT_FAILURE, "gelf_getehdr() failed: %s", 308 elf_errmsg(-1)); 309 310 memcpy(oeh.e_ident, ieh.e_ident, sizeof(ieh.e_ident)); 311 oeh.e_ident[EI_CLASS] = ecp->oec; 312 oeh.e_ident[EI_DATA] = ecp->oed; 313 if (ecp->abi != -1) 314 oeh.e_ident[EI_OSABI] = ecp->abi; 315 oeh.e_flags = ieh.e_flags; 316 oeh.e_machine = ieh.e_machine; 317 oeh.e_type = ieh.e_type; 318 oeh.e_entry = ieh.e_entry; 319 oeh.e_version = ieh.e_version; 320 321 ecp->flags &= ~(EXECUTABLE | DYNAMIC | RELOCATABLE); 322 if (ieh.e_type == ET_EXEC) 323 ecp->flags |= EXECUTABLE; 324 else if (ieh.e_type == ET_DYN) 325 ecp->flags |= DYNAMIC; 326 else if (ieh.e_type == ET_REL) 327 ecp->flags |= RELOCATABLE; 328 else 329 errx(EXIT_FAILURE, "unsupported e_type"); 330 331 if (!elf_getshnum(ecp->ein, &ishnum)) 332 errx(EXIT_FAILURE, "elf_getshnum failed: %s", 333 elf_errmsg(-1)); 334 if (ishnum > 0 && (ecp->secndx = calloc(ishnum, 335 sizeof(*ecp->secndx))) == NULL) 336 err(EXIT_FAILURE, "calloc failed"); 337 338 /* Read input object program header. */ 339 setup_phdr(ecp); 340 341 /* 342 * Scan of input sections: we iterate through sections from input 343 * object, skip sections need to be stripped, allot Elf_Scn and 344 * create internal section structure for sections we want. 345 * (i.e., determine output sections) 346 */ 347 create_scn(ecp); 348 349 /* Apply section address changes, if any. */ 350 adjust_addr(ecp); 351 352 /* 353 * Determine if the symbol table needs to be changed based on 354 * command line options. 355 */ 356 if (ecp->strip == STRIP_DEBUG || 357 ecp->strip == STRIP_UNNEEDED || 358 ecp->flags & WEAKEN_ALL || 359 ecp->flags & LOCALIZE_HIDDEN || 360 ecp->flags & DISCARD_LOCAL || 361 ecp->flags & DISCARD_LLABEL || 362 ecp->prefix_sym != NULL || 363 !STAILQ_EMPTY(&ecp->v_symop)) 364 ecp->flags &= ~SYMTAB_INTACT; 365 366 /* 367 * Create symbol table. Symbols are filtered or stripped according to 368 * command line args specified by user, and later updated for the new 369 * layout of sections in the output object. 370 */ 371 if ((ecp->flags & SYMTAB_EXIST) != 0) 372 create_symtab(ecp); 373 374 /* 375 * Write the underlying ehdr. Note that it should be called 376 * before elf_setshstrndx() since it will overwrite e->e_shstrndx. 377 */ 378 if (gelf_update_ehdr(ecp->eout, &oeh) == 0) 379 errx(EXIT_FAILURE, "gelf_update_ehdr() failed: %s", 380 elf_errmsg(-1)); 381 382 /* 383 * First processing of output sections: at this stage we copy the 384 * content of each section from input to output object. Section 385 * content will be modified and printed (mcs) if need. Also content of 386 * relocation section probably will be filtered and updated according 387 * to symbol table changes. 388 */ 389 copy_content(ecp); 390 391 /* 392 * Second processing of output sections: Update section headers. 393 * At this stage we set name string index, update st_link and st_info 394 * for output sections. 395 */ 396 update_shdr(ecp, 1); 397 398 /* Renew oeh to get the updated e_shstrndx. */ 399 if (gelf_getehdr(ecp->eout, &oeh) == NULL) 400 errx(EXIT_FAILURE, "gelf_getehdr() failed: %s", 401 elf_errmsg(-1)); 402 403 /* 404 * Insert SHDR table into the internal section list as a "pseudo" 405 * section, so later it will get sorted and resynced just as "normal" 406 * sections. 407 * 408 * Under FreeBSD, Binutils objcopy always put the section header 409 * at the end of all the sections. We want to do the same here. 410 * 411 * However, note that the behaviour is still different with Binutils: 412 * elfcopy checks the FreeBSD OSABI tag to tell whether it needs to 413 * move the section headers, while Binutils is probably configured 414 * this way when it's compiled on FreeBSD. 415 */ 416 if (oeh.e_ident[EI_OSABI] == ELFOSABI_FREEBSD) 417 shtab = insert_shtab(ecp, 1); 418 else 419 shtab = insert_shtab(ecp, 0); 420 421 /* 422 * Resync section offsets in the output object. This is needed 423 * because probably sections are modified or new sections are added, 424 * as a result overlap/gap might appears. 425 */ 426 resync_sections(ecp); 427 428 /* Store SHDR offset in EHDR. */ 429 oeh.e_shoff = shtab->off; 430 431 /* Put program header table immediately after the Elf header. */ 432 if (ecp->ophnum > 0) { 433 oeh.e_phoff = gelf_fsize(ecp->eout, ELF_T_EHDR, 1, EV_CURRENT); 434 if (oeh.e_phoff == 0) 435 errx(EXIT_FAILURE, "gelf_fsize() failed: %s", 436 elf_errmsg(-1)); 437 } 438 439 /* 440 * Update ELF object entry point if requested. 441 */ 442 if (ecp->change_addr != 0) 443 oeh.e_entry += ecp->change_addr; 444 if (ecp->flags & SET_START) 445 oeh.e_entry = ecp->set_start; 446 if (ecp->change_start != 0) 447 oeh.e_entry += ecp->change_start; 448 449 /* 450 * Update ehdr again before we call elf_update(), since we 451 * modified e_shoff and e_phoff. 452 */ 453 if (gelf_update_ehdr(ecp->eout, &oeh) == 0) 454 errx(EXIT_FAILURE, "gelf_update_ehdr() failed: %s", 455 elf_errmsg(-1)); 456 457 if (ecp->ophnum > 0) 458 copy_phdr(ecp); 459 460 /* Write out the output elf object. */ 461 if (elf_update(ecp->eout, ELF_C_WRITE) < 0) 462 errx(EXIT_FAILURE, "elf_update() failed: %s", 463 elf_errmsg(-1)); 464 465 /* Release allocated resource. */ 466 free_elf(ecp); 467 } 468 469 void 470 free_elf(struct elfcopy *ecp) 471 { 472 struct segment *seg, *seg_temp; 473 struct section *sec, *sec_temp; 474 475 /* Free internal segment list. */ 476 if (!STAILQ_EMPTY(&ecp->v_seg)) { 477 STAILQ_FOREACH_SAFE(seg, &ecp->v_seg, seg_list, seg_temp) { 478 STAILQ_REMOVE(&ecp->v_seg, seg, segment, seg_list); 479 free(seg); 480 } 481 } 482 483 /* Free symbol table buffers. */ 484 free_symtab(ecp); 485 486 /* Free section name string table. */ 487 elftc_string_table_destroy(ecp->shstrtab->strtab); 488 489 /* Free internal section list. */ 490 if (!TAILQ_EMPTY(&ecp->v_sec)) { 491 TAILQ_FOREACH_SAFE(sec, &ecp->v_sec, sec_list, sec_temp) { 492 TAILQ_REMOVE(&ecp->v_sec, sec, sec_list); 493 if (sec->buf != NULL) 494 free(sec->buf); 495 if (sec->newname != NULL) 496 free(sec->newname); 497 if (sec->pad != NULL) 498 free(sec->pad); 499 free(sec); 500 } 501 } 502 503 ecp->symtab = NULL; 504 ecp->strtab = NULL; 505 ecp->shstrtab = NULL; 506 507 if (ecp->secndx != NULL) { 508 free(ecp->secndx); 509 ecp->secndx = NULL; 510 } 511 } 512 513 /* Create a temporary file. */ 514 void 515 create_tempfile(char **fn, int *fd) 516 { 517 const char *tmpdir; 518 char *cp, *tmpf; 519 size_t tlen, plen; 520 521 #define _TEMPFILE "ecp.XXXXXXXX" 522 #define _TEMPFILEPATH "/tmp/ecp.XXXXXXXX" 523 524 if (fn == NULL || fd == NULL) 525 return; 526 /* Repect TMPDIR environment variable. */ 527 tmpdir = getenv("TMPDIR"); 528 if (tmpdir != NULL && *tmpdir != '\0') { 529 tlen = strlen(tmpdir); 530 plen = strlen(_TEMPFILE); 531 tmpf = malloc(tlen + plen + 2); 532 if (tmpf == NULL) 533 err(EXIT_FAILURE, "malloc failed"); 534 strncpy(tmpf, tmpdir, tlen); 535 cp = &tmpf[tlen - 1]; 536 if (*cp++ != '/') 537 *cp++ = '/'; 538 strncpy(cp, _TEMPFILE, plen); 539 cp[plen] = '\0'; 540 } else { 541 tmpf = strdup(_TEMPFILEPATH); 542 if (tmpf == NULL) 543 err(EXIT_FAILURE, "strdup failed"); 544 } 545 if ((*fd = mkstemp(tmpf)) == -1) 546 err(EXIT_FAILURE, "mkstemp %s failed", tmpf); 547 if (fchmod(*fd, 0644) == -1) 548 err(EXIT_FAILURE, "fchmod %s failed", tmpf); 549 *fn = tmpf; 550 551 #undef _TEMPFILE 552 #undef _TEMPFILEPATH 553 } 554 555 /* 556 * Copy temporary file with path src and file descriptor infd to path dst. 557 * If in_place is set act as if editing the file in place, avoiding rename() 558 * to preserve hard and symbolic links. Output file remains open, with file 559 * descriptor returned in outfd. 560 */ 561 static int 562 copy_from_tempfile(const char *src, const char *dst, int infd, int *outfd, 563 int in_place) 564 { 565 int tmpfd; 566 567 /* 568 * First, check if we can use rename(). 569 */ 570 if (in_place == 0) { 571 if (rename(src, dst) >= 0) { 572 *outfd = infd; 573 return (0); 574 } else if (errno != EXDEV) 575 return (-1); 576 577 /* 578 * If the rename() failed due to 'src' and 'dst' residing in 579 * two different file systems, invoke a helper function in 580 * libelftc to do the copy. 581 */ 582 583 if (unlink(dst) < 0) 584 return (-1); 585 } 586 587 if ((tmpfd = open(dst, O_CREAT | O_TRUNC | O_WRONLY, 0755)) < 0) 588 return (-1); 589 590 if (elftc_copyfile(infd, tmpfd) < 0) { 591 (void) close(tmpfd); 592 return (-1); 593 } 594 595 /* 596 * Remove the temporary file from the file system 597 * namespace, and close its file descriptor. 598 */ 599 if (unlink(src) < 0) { 600 (void) close(tmpfd); 601 return (-1); 602 } 603 604 (void) close(infd); 605 606 /* 607 * Return the file descriptor for the destination. 608 */ 609 *outfd = tmpfd; 610 611 return (0); 612 } 613 614 static void 615 create_file(struct elfcopy *ecp, const char *src, const char *dst) 616 { 617 struct stat sb; 618 char *tempfile, *elftemp; 619 int efd, ifd, ofd, ofd0, tfd; 620 int in_place; 621 622 tempfile = NULL; 623 624 if (src == NULL) 625 errx(EXIT_FAILURE, "internal: src == NULL"); 626 if ((ifd = open(src, O_RDONLY)) == -1) 627 err(EXIT_FAILURE, "open %s failed", src); 628 629 if (fstat(ifd, &sb) == -1) 630 err(EXIT_FAILURE, "fstat %s failed", src); 631 632 if (dst == NULL) 633 create_tempfile(&tempfile, &ofd); 634 else 635 if ((ofd = open(dst, O_RDWR|O_CREAT, 0755)) == -1) 636 err(EXIT_FAILURE, "open %s failed", dst); 637 638 #ifndef LIBELF_AR 639 /* Detect and process ar(1) archive using libarchive. */ 640 if (ac_detect_ar(ifd)) { 641 ac_create_ar(ecp, ifd, ofd); 642 goto copy_done; 643 } 644 #endif 645 646 if (lseek(ifd, 0, SEEK_SET) < 0) 647 err(EXIT_FAILURE, "lseek failed"); 648 649 /* 650 * If input object is not ELF file, convert it to an intermediate 651 * ELF object before processing. 652 */ 653 if (ecp->itf != ETF_ELF) { 654 /* 655 * If the output object is not an ELF file, choose an arbitrary 656 * ELF format for the intermediate file. srec, ihex and binary 657 * formats are independent of class, endianness and machine 658 * type so these choices do not affect the output. 659 */ 660 if (ecp->otf != ETF_ELF) { 661 if (ecp->oec == ELFCLASSNONE) 662 ecp->oec = ELFCLASS64; 663 if (ecp->oed == ELFDATANONE) 664 ecp->oed = ELFDATA2LSB; 665 } 666 create_tempfile(&elftemp, &efd); 667 if ((ecp->eout = elf_begin(efd, ELF_C_WRITE, NULL)) == NULL) 668 errx(EXIT_FAILURE, "elf_begin() failed: %s", 669 elf_errmsg(-1)); 670 elf_flagelf(ecp->eout, ELF_C_SET, ELF_F_LAYOUT); 671 if (ecp->itf == ETF_BINARY) 672 create_elf_from_binary(ecp, ifd, src); 673 else if (ecp->itf == ETF_IHEX) 674 create_elf_from_ihex(ecp, ifd); 675 else if (ecp->itf == ETF_SREC) 676 create_elf_from_srec(ecp, ifd); 677 else 678 errx(EXIT_FAILURE, "Internal: invalid target flavour"); 679 elf_end(ecp->eout); 680 681 /* Open intermediate ELF object as new input object. */ 682 close(ifd); 683 if ((ifd = open(elftemp, O_RDONLY)) == -1) 684 err(EXIT_FAILURE, "open %s failed", src); 685 close(efd); 686 if (unlink(elftemp) < 0) 687 err(EXIT_FAILURE, "unlink %s failed", elftemp); 688 free(elftemp); 689 } 690 691 if ((ecp->ein = elf_begin(ifd, ELF_C_READ, NULL)) == NULL) 692 errx(EXIT_FAILURE, "elf_begin() failed: %s", 693 elf_errmsg(-1)); 694 695 switch (elf_kind(ecp->ein)) { 696 case ELF_K_NONE: 697 errx(EXIT_FAILURE, "file format not recognized"); 698 case ELF_K_ELF: 699 if ((ecp->eout = elf_begin(ofd, ELF_C_WRITE, NULL)) == NULL) 700 errx(EXIT_FAILURE, "elf_begin() failed: %s", 701 elf_errmsg(-1)); 702 703 /* elfcopy(1) manage ELF layout by itself. */ 704 elf_flagelf(ecp->eout, ELF_C_SET, ELF_F_LAYOUT); 705 706 /* 707 * Create output ELF object. 708 */ 709 create_elf(ecp); 710 elf_end(ecp->eout); 711 712 /* 713 * Convert the output ELF object to binary/srec/ihex if need. 714 */ 715 if (ecp->otf != ETF_ELF) { 716 /* 717 * Create (another) tempfile for binary/srec/ihex 718 * output object. 719 */ 720 if (tempfile != NULL) { 721 if (unlink(tempfile) < 0) 722 err(EXIT_FAILURE, "unlink %s failed", 723 tempfile); 724 free(tempfile); 725 } 726 create_tempfile(&tempfile, &ofd0); 727 728 729 /* 730 * Rewind the file descriptor being processed. 731 */ 732 if (lseek(ofd, 0, SEEK_SET) < 0) 733 err(EXIT_FAILURE, 734 "lseek failed for the output object"); 735 736 /* 737 * Call flavour-specific conversion routine. 738 */ 739 switch (ecp->otf) { 740 case ETF_BINARY: 741 create_binary(ofd, ofd0); 742 break; 743 case ETF_IHEX: 744 create_ihex(ofd, ofd0); 745 break; 746 case ETF_SREC: 747 create_srec(ecp, ofd, ofd0, 748 dst != NULL ? dst : src); 749 break; 750 case ETF_PE: 751 case ETF_EFI: 752 #if WITH_PE 753 create_pe(ecp, ofd, ofd0); 754 #else 755 errx(EXIT_FAILURE, "PE/EFI support not enabled" 756 " at compile time"); 757 #endif 758 break; 759 default: 760 errx(EXIT_FAILURE, "Internal: unsupported" 761 " output flavour %d", ecp->oec); 762 } 763 764 close(ofd); 765 ofd = ofd0; 766 } 767 768 break; 769 770 case ELF_K_AR: 771 /* XXX: Not yet supported. */ 772 break; 773 default: 774 errx(EXIT_FAILURE, "file format not supported"); 775 } 776 777 elf_end(ecp->ein); 778 779 #ifndef LIBELF_AR 780 copy_done: 781 #endif 782 783 if (tempfile != NULL) { 784 in_place = 0; 785 if (dst == NULL) { 786 dst = src; 787 if (lstat(dst, &sb) != -1 && 788 (sb.st_nlink > 1 || S_ISLNK(sb.st_mode))) 789 in_place = 1; 790 } 791 792 if (copy_from_tempfile(tempfile, dst, ofd, &tfd, in_place) < 0) 793 err(EXIT_FAILURE, "creation of %s failed", dst); 794 795 free(tempfile); 796 tempfile = NULL; 797 798 ofd = tfd; 799 } 800 801 if (strcmp(dst, "/dev/null") && fchmod(ofd, sb.st_mode) == -1) 802 err(EXIT_FAILURE, "fchmod %s failed", dst); 803 804 if ((ecp->flags & PRESERVE_DATE) && 805 elftc_set_timestamps(dst, &sb) < 0) 806 err(EXIT_FAILURE, "setting timestamps failed"); 807 808 close(ifd); 809 close(ofd); 810 } 811 812 static void 813 elfcopy_main(struct elfcopy *ecp, int argc, char **argv) 814 { 815 struct sec_action *sac; 816 const char *infile, *outfile; 817 char *fn, *s; 818 int opt; 819 820 while ((opt = getopt_long(argc, argv, "dB:gG:I:j:K:L:N:O:pR:s:SwW:xXV", 821 elfcopy_longopts, NULL)) != -1) { 822 switch(opt) { 823 case 'B': 824 /* ignored */ 825 break; 826 case 'R': 827 sac = lookup_sec_act(ecp, optarg, 1); 828 if (sac->copy != 0) 829 errx(EXIT_FAILURE, 830 "both copy and remove specified"); 831 sac->remove = 1; 832 ecp->flags |= SEC_REMOVE; 833 break; 834 case 'S': 835 ecp->strip = STRIP_ALL; 836 break; 837 case 'g': 838 ecp->strip = STRIP_DEBUG; 839 break; 840 case 'G': 841 ecp->flags |= KEEP_GLOBAL; 842 add_to_symop_list(ecp, optarg, NULL, SYMOP_KEEPG); 843 break; 844 case 'I': 845 case 's': 846 set_input_target(ecp, optarg); 847 break; 848 case 'j': 849 sac = lookup_sec_act(ecp, optarg, 1); 850 if (sac->remove != 0) 851 errx(EXIT_FAILURE, 852 "both copy and remove specified"); 853 sac->copy = 1; 854 ecp->flags |= SEC_COPY; 855 break; 856 case 'K': 857 add_to_symop_list(ecp, optarg, NULL, SYMOP_KEEP); 858 break; 859 case 'L': 860 add_to_symop_list(ecp, optarg, NULL, SYMOP_LOCALIZE); 861 break; 862 case 'N': 863 add_to_symop_list(ecp, optarg, NULL, SYMOP_STRIP); 864 break; 865 case 'O': 866 set_output_target(ecp, optarg); 867 break; 868 case 'p': 869 ecp->flags |= PRESERVE_DATE; 870 break; 871 case 'V': 872 print_version(); 873 break; 874 case 'w': 875 ecp->flags |= WILDCARD; 876 break; 877 case 'W': 878 add_to_symop_list(ecp, optarg, NULL, SYMOP_WEAKEN); 879 break; 880 case 'x': 881 ecp->flags |= DISCARD_LOCAL; 882 break; 883 case 'X': 884 ecp->flags |= DISCARD_LLABEL; 885 break; 886 case ECP_ADD_GNU_DEBUGLINK: 887 ecp->debuglink = optarg; 888 break; 889 case ECP_ADD_SECTION: 890 add_section(ecp, optarg); 891 break; 892 case ECP_CHANGE_ADDR: 893 ecp->change_addr = (int64_t) strtoll(optarg, NULL, 0); 894 break; 895 case ECP_CHANGE_SEC_ADDR: 896 parse_sec_address_op(ecp, opt, "--change-section-addr", 897 optarg); 898 break; 899 case ECP_CHANGE_SEC_LMA: 900 parse_sec_address_op(ecp, opt, "--change-section-lma", 901 optarg); 902 break; 903 case ECP_CHANGE_SEC_VMA: 904 parse_sec_address_op(ecp, opt, "--change-section-vma", 905 optarg); 906 break; 907 case ECP_CHANGE_START: 908 ecp->change_start = (int64_t) strtoll(optarg, NULL, 0); 909 break; 910 case ECP_CHANGE_WARN: 911 /* default */ 912 break; 913 case ECP_GAP_FILL: 914 ecp->fill = (uint8_t) strtoul(optarg, NULL, 0); 915 ecp->flags |= GAP_FILL; 916 break; 917 case ECP_GLOBALIZE_SYMBOL: 918 add_to_symop_list(ecp, optarg, NULL, SYMOP_GLOBALIZE); 919 break; 920 case ECP_GLOBALIZE_SYMBOLS: 921 parse_symlist_file(ecp, optarg, SYMOP_GLOBALIZE); 922 break; 923 case ECP_KEEP_SYMBOLS: 924 parse_symlist_file(ecp, optarg, SYMOP_KEEP); 925 break; 926 case ECP_KEEP_GLOBAL_SYMBOLS: 927 parse_symlist_file(ecp, optarg, SYMOP_KEEPG); 928 break; 929 case ECP_LOCALIZE_HIDDEN: 930 ecp->flags |= LOCALIZE_HIDDEN; 931 break; 932 case ECP_LOCALIZE_SYMBOLS: 933 parse_symlist_file(ecp, optarg, SYMOP_LOCALIZE); 934 break; 935 case ECP_NO_CHANGE_WARN: 936 ecp->flags |= NO_CHANGE_WARN; 937 break; 938 case ECP_ONLY_DEBUG: 939 ecp->strip = STRIP_NONDEBUG; 940 break; 941 case ECP_ONLY_DWO: 942 ecp->strip = STRIP_NONDWO; 943 break; 944 case ECP_PAD_TO: 945 ecp->pad_to = (uint64_t) strtoull(optarg, NULL, 0); 946 break; 947 case ECP_PREFIX_ALLOC: 948 ecp->prefix_alloc = optarg; 949 break; 950 case ECP_PREFIX_SEC: 951 ecp->prefix_sec = optarg; 952 break; 953 case ECP_PREFIX_SYM: 954 ecp->prefix_sym = optarg; 955 break; 956 case ECP_REDEF_SYMBOL: 957 if ((s = strchr(optarg, '=')) == NULL) 958 errx(EXIT_FAILURE, 959 "illegal format for --redefine-sym"); 960 *s++ = '\0'; 961 add_to_symop_list(ecp, optarg, s, SYMOP_REDEF); 962 break; 963 case ECP_REDEF_SYMBOLS: 964 parse_symlist_file(ecp, optarg, SYMOP_REDEF); 965 break; 966 case ECP_RENAME_SECTION: 967 if ((fn = strchr(optarg, '=')) == NULL) 968 errx(EXIT_FAILURE, 969 "illegal format for --rename-section"); 970 *fn++ = '\0'; 971 972 /* Check for optional flags. */ 973 if ((s = strchr(fn, ',')) != NULL) 974 *s++ = '\0'; 975 976 sac = lookup_sec_act(ecp, optarg, 1); 977 sac->rename = 1; 978 sac->newname = fn; 979 if (s != NULL) 980 parse_sec_flags(sac, s); 981 break; 982 case ECP_SET_OSABI: 983 set_osabi(ecp, optarg); 984 break; 985 case ECP_SET_SEC_FLAGS: 986 if ((s = strchr(optarg, '=')) == NULL) 987 errx(EXIT_FAILURE, 988 "illegal format for --set-section-flags"); 989 *s++ = '\0'; 990 sac = lookup_sec_act(ecp, optarg, 1); 991 parse_sec_flags(sac, s); 992 break; 993 case ECP_SET_START: 994 ecp->flags |= SET_START; 995 ecp->set_start = (uint64_t) strtoull(optarg, NULL, 0); 996 break; 997 case ECP_SREC_FORCE_S3: 998 ecp->flags |= SREC_FORCE_S3; 999 break; 1000 case ECP_SREC_LEN: 1001 ecp->flags |= SREC_FORCE_LEN; 1002 ecp->srec_len = strtoul(optarg, NULL, 0); 1003 break; 1004 case ECP_STRIP_DWO: 1005 ecp->strip = STRIP_DWO; 1006 break; 1007 case ECP_STRIP_SYMBOLS: 1008 parse_symlist_file(ecp, optarg, SYMOP_STRIP); 1009 break; 1010 case ECP_STRIP_UNNEEDED: 1011 ecp->strip = STRIP_UNNEEDED; 1012 break; 1013 case ECP_WEAKEN_ALL: 1014 ecp->flags |= WEAKEN_ALL; 1015 break; 1016 case ECP_WEAKEN_SYMBOLS: 1017 parse_symlist_file(ecp, optarg, SYMOP_WEAKEN); 1018 break; 1019 default: 1020 elfcopy_usage(); 1021 } 1022 } 1023 1024 argc -= optind; 1025 argv += optind; 1026 1027 if (argc == 0 || argc > 2) 1028 elfcopy_usage(); 1029 1030 infile = argv[0]; 1031 outfile = NULL; 1032 if (argc > 1) 1033 outfile = argv[1]; 1034 1035 create_file(ecp, infile, outfile); 1036 } 1037 1038 static void 1039 mcs_main(struct elfcopy *ecp, int argc, char **argv) 1040 { 1041 struct sec_action *sac; 1042 const char *string; 1043 int append, delete, compress, name, print; 1044 int opt, i; 1045 1046 append = delete = compress = name = print = 0; 1047 string = NULL; 1048 while ((opt = getopt_long(argc, argv, "a:cdhn:pV", mcs_longopts, 1049 NULL)) != -1) { 1050 switch(opt) { 1051 case 'a': 1052 append = 1; 1053 string = optarg; /* XXX multiple -a not supported */ 1054 break; 1055 case 'c': 1056 compress = 1; 1057 break; 1058 case 'd': 1059 delete = 1; 1060 break; 1061 case 'n': 1062 name = 1; 1063 (void)lookup_sec_act(ecp, optarg, 1); 1064 break; 1065 case 'p': 1066 print = 1; 1067 break; 1068 case 'V': 1069 print_version(); 1070 break; 1071 case 'h': 1072 default: 1073 mcs_usage(); 1074 } 1075 } 1076 1077 argc -= optind; 1078 argv += optind; 1079 1080 if (argc == 0) 1081 mcs_usage(); 1082 1083 /* Must specify one operation at least. */ 1084 if (!append && !compress && !delete && !print) 1085 mcs_usage(); 1086 1087 /* 1088 * If we are going to delete, ignore other operations. This is 1089 * different from the Solaris implementation, which can print 1090 * and delete a section at the same time, for example. Also, this 1091 * implementation do not respect the order between operations that 1092 * user specified, i.e., "mcs -pc a.out" equals to "mcs -cp a.out". 1093 */ 1094 if (delete) { 1095 append = compress = print = 0; 1096 ecp->flags |= SEC_REMOVE; 1097 } 1098 if (append) 1099 ecp->flags |= SEC_APPEND; 1100 if (compress) 1101 ecp->flags |= SEC_COMPRESS; 1102 if (print) 1103 ecp->flags |= SEC_PRINT; 1104 1105 /* .comment is the default section to operate on. */ 1106 if (!name) 1107 (void)lookup_sec_act(ecp, ".comment", 1); 1108 1109 STAILQ_FOREACH(sac, &ecp->v_sac, sac_list) { 1110 sac->append = append; 1111 sac->compress = compress; 1112 sac->print = print; 1113 sac->remove = delete; 1114 sac->string = string; 1115 } 1116 1117 for (i = 0; i < argc; i++) { 1118 /* If only -p is specified, output to /dev/null */ 1119 if (print && !append && !compress && !delete) 1120 create_file(ecp, argv[i], "/dev/null"); 1121 else 1122 create_file(ecp, argv[i], NULL); 1123 } 1124 } 1125 1126 static void 1127 strip_main(struct elfcopy *ecp, int argc, char **argv) 1128 { 1129 struct sec_action *sac; 1130 const char *outfile; 1131 int opt; 1132 int i; 1133 1134 outfile = NULL; 1135 while ((opt = getopt_long(argc, argv, "hI:K:N:o:O:pR:sSdgVxXw", 1136 strip_longopts, NULL)) != -1) { 1137 switch(opt) { 1138 case 'R': 1139 sac = lookup_sec_act(ecp, optarg, 1); 1140 sac->remove = 1; 1141 ecp->flags |= SEC_REMOVE; 1142 break; 1143 case 's': 1144 ecp->strip = STRIP_ALL; 1145 break; 1146 case 'S': 1147 case 'g': 1148 case 'd': 1149 ecp->strip = STRIP_DEBUG; 1150 break; 1151 case 'I': 1152 /* ignored */ 1153 break; 1154 case 'K': 1155 add_to_symop_list(ecp, optarg, NULL, SYMOP_KEEP); 1156 break; 1157 case 'N': 1158 add_to_symop_list(ecp, optarg, NULL, SYMOP_STRIP); 1159 break; 1160 case 'o': 1161 outfile = optarg; 1162 break; 1163 case 'O': 1164 set_output_target(ecp, optarg); 1165 break; 1166 case 'p': 1167 ecp->flags |= PRESERVE_DATE; 1168 break; 1169 case 'V': 1170 print_version(); 1171 break; 1172 case 'w': 1173 ecp->flags |= WILDCARD; 1174 break; 1175 case 'x': 1176 ecp->flags |= DISCARD_LOCAL; 1177 break; 1178 case 'X': 1179 ecp->flags |= DISCARD_LLABEL; 1180 break; 1181 case ECP_ONLY_DEBUG: 1182 ecp->strip = STRIP_NONDEBUG; 1183 break; 1184 case ECP_STRIP_UNNEEDED: 1185 ecp->strip = STRIP_UNNEEDED; 1186 break; 1187 case 'h': 1188 default: 1189 strip_usage(); 1190 } 1191 } 1192 1193 argc -= optind; 1194 argv += optind; 1195 1196 if (ecp->strip == 0 && 1197 ((ecp->flags & DISCARD_LOCAL) == 0) && 1198 ((ecp->flags & DISCARD_LLABEL) == 0) && 1199 lookup_symop_list(ecp, NULL, SYMOP_STRIP) == NULL) 1200 ecp->strip = STRIP_ALL; 1201 if (argc == 0) 1202 strip_usage(); 1203 /* 1204 * Only accept a single input file if an output file had been 1205 * specified. 1206 */ 1207 if (outfile != NULL && argc != 1) 1208 strip_usage(); 1209 1210 for (i = 0; i < argc; i++) 1211 create_file(ecp, argv[i], outfile); 1212 } 1213 1214 static void 1215 parse_sec_flags(struct sec_action *sac, char *s) 1216 { 1217 const char *flag; 1218 int found, i; 1219 1220 for (flag = strtok(s, ","); flag; flag = strtok(NULL, ",")) { 1221 found = 0; 1222 for (i = 0; sec_flags[i].name != NULL; i++) 1223 if (strcasecmp(sec_flags[i].name, flag) == 0) { 1224 sac->flags |= sec_flags[i].value; 1225 found = 1; 1226 break; 1227 } 1228 if (!found) 1229 errx(EXIT_FAILURE, "unrecognized section flag %s", 1230 flag); 1231 } 1232 } 1233 1234 static void 1235 parse_sec_address_op(struct elfcopy *ecp, int optnum, const char *optname, 1236 char *s) 1237 { 1238 struct sec_action *sac; 1239 const char *name; 1240 char *v; 1241 char op; 1242 1243 name = v = s; 1244 do { 1245 v++; 1246 } while (*v != '\0' && *v != '=' && *v != '+' && *v != '-'); 1247 if (*v == '\0' || *(v + 1) == '\0') 1248 errx(EXIT_FAILURE, "invalid format for %s", optname); 1249 op = *v; 1250 *v++ = '\0'; 1251 sac = lookup_sec_act(ecp, name, 1); 1252 switch (op) { 1253 case '=': 1254 if (optnum == ECP_CHANGE_SEC_LMA || 1255 optnum == ECP_CHANGE_SEC_ADDR) { 1256 sac->setlma = 1; 1257 sac->lma = (uint64_t) strtoull(v, NULL, 0); 1258 } 1259 if (optnum == ECP_CHANGE_SEC_VMA || 1260 optnum == ECP_CHANGE_SEC_ADDR) { 1261 sac->setvma = 1; 1262 sac->vma = (uint64_t) strtoull(v, NULL, 0); 1263 } 1264 break; 1265 case '+': 1266 if (optnum == ECP_CHANGE_SEC_LMA || 1267 optnum == ECP_CHANGE_SEC_ADDR) 1268 sac->lma_adjust = (int64_t) strtoll(v, NULL, 0); 1269 if (optnum == ECP_CHANGE_SEC_VMA || 1270 optnum == ECP_CHANGE_SEC_ADDR) 1271 sac->vma_adjust = (int64_t) strtoll(v, NULL, 0); 1272 break; 1273 case '-': 1274 if (optnum == ECP_CHANGE_SEC_LMA || 1275 optnum == ECP_CHANGE_SEC_ADDR) 1276 sac->lma_adjust = (int64_t) -strtoll(v, NULL, 0); 1277 if (optnum == ECP_CHANGE_SEC_VMA || 1278 optnum == ECP_CHANGE_SEC_ADDR) 1279 sac->vma_adjust = (int64_t) -strtoll(v, NULL, 0); 1280 break; 1281 default: 1282 break; 1283 } 1284 } 1285 1286 static void 1287 parse_symlist_file(struct elfcopy *ecp, const char *fn, unsigned int op) 1288 { 1289 struct symfile *sf; 1290 struct stat sb; 1291 FILE *fp; 1292 char *data, *p, *line, *end, *e, *n; 1293 1294 if (stat(fn, &sb) == -1) 1295 err(EXIT_FAILURE, "stat %s failed", fn); 1296 1297 /* Check if we already read and processed this file. */ 1298 STAILQ_FOREACH(sf, &ecp->v_symfile, symfile_list) { 1299 if (sf->dev == sb.st_dev && sf->ino == sb.st_ino) 1300 goto process_symfile; 1301 } 1302 1303 if ((fp = fopen(fn, "r")) == NULL) 1304 err(EXIT_FAILURE, "can not open %s", fn); 1305 if ((data = malloc(sb.st_size + 1)) == NULL) 1306 err(EXIT_FAILURE, "malloc failed"); 1307 if (sb.st_size > 0) 1308 if (fread(data, sb.st_size, 1, fp) != 1) 1309 err(EXIT_FAILURE, "fread failed"); 1310 fclose(fp); 1311 data[sb.st_size] = '\0'; 1312 1313 if ((sf = calloc(1, sizeof(*sf))) == NULL) 1314 err(EXIT_FAILURE, "malloc failed"); 1315 sf->dev = sb.st_dev; 1316 sf->ino = sb.st_ino; 1317 sf->size = sb.st_size + 1; 1318 sf->data = data; 1319 1320 process_symfile: 1321 1322 /* 1323 * Basically what we do here is to convert EOL to '\0', and remove 1324 * leading and trailing whitespaces for each line. 1325 */ 1326 1327 end = sf->data + sf->size; 1328 line = NULL; 1329 for(p = sf->data; p < end; p++) { 1330 if ((*p == '\t' || *p == ' ') && line == NULL) 1331 continue; 1332 if (*p == '\r' || *p == '\n' || *p == '\0') { 1333 *p = '\0'; 1334 if (line == NULL) 1335 continue; 1336 1337 /* Skip comment. */ 1338 if (*line == '#') { 1339 line = NULL; 1340 continue; 1341 } 1342 1343 e = p - 1; 1344 while(e != line && (*e == '\t' || *e == ' ')) 1345 *e-- = '\0'; 1346 if (op != SYMOP_REDEF) 1347 add_to_symop_list(ecp, line, NULL, op); 1348 else { 1349 if (strlen(line) < 3) 1350 errx(EXIT_FAILURE, 1351 "illegal format for" 1352 " --redefine-sym"); 1353 for(n = line + 1; n < e; n++) { 1354 if (*n == ' ' || *n == '\t') { 1355 while(*n == ' ' || *n == '\t') 1356 *n++ = '\0'; 1357 break; 1358 } 1359 } 1360 if (n >= e) 1361 errx(EXIT_FAILURE, 1362 "illegal format for" 1363 " --redefine-sym"); 1364 add_to_symop_list(ecp, line, n, op); 1365 } 1366 line = NULL; 1367 continue; 1368 } 1369 1370 if (line == NULL) 1371 line = p; 1372 } 1373 } 1374 1375 static void 1376 set_input_target(struct elfcopy *ecp, const char *target_name) 1377 { 1378 Elftc_Bfd_Target *tgt; 1379 1380 if ((tgt = elftc_bfd_find_target(target_name)) == NULL) 1381 errx(EXIT_FAILURE, "%s: invalid target name", target_name); 1382 ecp->itf = elftc_bfd_target_flavor(tgt); 1383 } 1384 1385 static void 1386 set_output_target(struct elfcopy *ecp, const char *target_name) 1387 { 1388 Elftc_Bfd_Target *tgt; 1389 1390 if ((tgt = elftc_bfd_find_target(target_name)) == NULL) 1391 errx(EXIT_FAILURE, "%s: invalid target name", target_name); 1392 ecp->otf = elftc_bfd_target_flavor(tgt); 1393 if (ecp->otf == ETF_ELF) { 1394 ecp->oec = elftc_bfd_target_class(tgt); 1395 ecp->oed = elftc_bfd_target_byteorder(tgt); 1396 ecp->oem = elftc_bfd_target_machine(tgt); 1397 ecp->abi = elftc_bfd_target_osabi(tgt); 1398 } 1399 if (ecp->otf == ETF_EFI || ecp->otf == ETF_PE) 1400 ecp->oem = elftc_bfd_target_machine(tgt); 1401 1402 ecp->otgt = target_name; 1403 } 1404 1405 static void 1406 set_osabi(struct elfcopy *ecp, const char *abi) 1407 { 1408 int i, found; 1409 1410 found = 0; 1411 for (i = 0; osabis[i].name != NULL; i++) 1412 if (strcasecmp(osabis[i].name, abi) == 0) { 1413 ecp->abi = osabis[i].abi; 1414 found = 1; 1415 break; 1416 } 1417 if (!found) 1418 errx(EXIT_FAILURE, "unrecognized OSABI %s", abi); 1419 } 1420 1421 #define ELFCOPY_USAGE_MESSAGE "\ 1422 Usage: %s [options] infile [outfile]\n\ 1423 Transform object files.\n\n\ 1424 Options:\n\ 1425 -d | -g | --strip-debug Remove debugging information from the output.\n\ 1426 -j SECTION | --only-section=SECTION\n\ 1427 Copy only the named section to the output.\n\ 1428 -p | --preserve-dates Preserve access and modification times.\n\ 1429 -w | --wildcard Use shell-style patterns to name symbols.\n\ 1430 -x | --discard-all Do not copy non-globals to the output.\n\ 1431 -I FORMAT | --input-target=FORMAT\n\ 1432 Specify object format for the input file.\n\ 1433 -K SYM | --keep-symbol=SYM Copy symbol SYM to the output.\n\ 1434 -L SYM | --localize-symbol=SYM\n\ 1435 Make symbol SYM local to the output file.\n\ 1436 -N SYM | --strip-symbol=SYM Do not copy symbol SYM to the output.\n\ 1437 -O FORMAT | --output-target=FORMAT\n\ 1438 Specify object format for the output file.\n\ 1439 FORMAT should be a target name understood by\n\ 1440 elftc_bfd_find_target(3).\n\ 1441 -R NAME | --remove-section=NAME\n\ 1442 Remove the named section.\n\ 1443 -S | --strip-all Remove all symbol and relocation information\n\ 1444 from the output.\n\ 1445 -V | --version Print a version identifier and exit.\n\ 1446 -W SYM | --weaken-symbol=SYM Mark symbol SYM as weak in the output.\n\ 1447 -X | --discard-locals Do not copy compiler generated symbols to\n\ 1448 the output.\n\ 1449 --add-section NAME=FILE Add the contents of FILE to the ELF object as\n\ 1450 a new section named NAME.\n\ 1451 --adjust-section-vma SECTION{=,+,-}VAL | \\\n\ 1452 --change-section-address SECTION{=,+,-}VAL\n\ 1453 Set or adjust the VMA and the LMA of the\n\ 1454 named section by VAL.\n\ 1455 --adjust-start=INCR | --change-start=INCR\n\ 1456 Add INCR to the start address for the ELF\n\ 1457 object.\n\ 1458 --adjust-vma=INCR | --change-addresses=INCR\n\ 1459 Increase the VMA and LMA of all sections by\n\ 1460 INCR.\n\ 1461 --adjust-warning | --change-warnings\n\ 1462 Issue warnings for non-existent sections.\n\ 1463 --change-section-lma SECTION{=,+,-}VAL\n\ 1464 Set or adjust the LMA address of the named\n\ 1465 section by VAL.\n\ 1466 --change-section-vma SECTION{=,+,-}VAL\n\ 1467 Set or adjust the VMA address of the named\n\ 1468 section by VAL.\n\ 1469 --gap-fill=VAL Fill the gaps between sections with bytes\n\ 1470 of value VAL.\n\ 1471 --localize-hidden Make all hidden symbols local to the output\n\ 1472 file.\n\ 1473 --no-adjust-warning| --no-change-warnings\n\ 1474 Do not issue warnings for non-existent\n\ 1475 sections.\n\ 1476 --only-keep-debug Copy only debugging information.\n\ 1477 --output-target=FORMAT Use the specified format for the output.\n\ 1478 --pad-to=ADDRESS Pad the output object up to the given address.\n\ 1479 --prefix-alloc-sections=STRING\n\ 1480 Prefix the section names of all the allocated\n\ 1481 sections with STRING.\n\ 1482 --prefix-sections=STRING Prefix the section names of all the sections\n\ 1483 with STRING.\n\ 1484 --prefix-symbols=STRING Prefix the symbol names of all the symbols\n\ 1485 with STRING.\n\ 1486 --rename-section OLDNAME=NEWNAME[,FLAGS]\n\ 1487 Rename and optionally change section flags.\n\ 1488 --set-section-flags SECTION=FLAGS\n\ 1489 Set section flags for the named section.\n\ 1490 Supported flags are: 'alloc', 'code',\n\ 1491 'contents', 'data', 'debug', 'load',\n\ 1492 'noload', 'readonly', 'rom', and 'shared'.\n\ 1493 --set-start=ADDRESS Set the start address of the ELF object.\n\ 1494 --srec-forceS3 Only generate S3 S-Records.\n\ 1495 --srec-len=LEN Set the maximum length of a S-Record line.\n\ 1496 --strip-unneeded Do not copy relocation information.\n" 1497 1498 static void 1499 elfcopy_usage(void) 1500 { 1501 (void) fprintf(stderr, ELFCOPY_USAGE_MESSAGE, ELFTC_GETPROGNAME()); 1502 exit(EXIT_FAILURE); 1503 } 1504 1505 #define MCS_USAGE_MESSAGE "\ 1506 Usage: %s [options] file...\n\ 1507 Manipulate the comment section in an ELF object.\n\n\ 1508 Options:\n\ 1509 -a STRING Append 'STRING' to the comment section.\n\ 1510 -c Remove duplicate entries from the comment section.\n\ 1511 -d Delete the comment section.\n\ 1512 -h | --help Print a help message and exit.\n\ 1513 -n NAME Operate on the ELF section with name 'NAME'.\n\ 1514 -p Print the contents of the comment section.\n\ 1515 -V | --version Print a version identifier and exit.\n" 1516 1517 static void 1518 mcs_usage(void) 1519 { 1520 (void) fprintf(stderr, MCS_USAGE_MESSAGE, ELFTC_GETPROGNAME()); 1521 exit(EXIT_FAILURE); 1522 } 1523 1524 #define STRIP_USAGE_MESSAGE "\ 1525 Usage: %s [options] file...\n\ 1526 Discard information from ELF objects.\n\n\ 1527 Options:\n\ 1528 -d | -g | -S | --strip-debug Remove debugging symbols.\n\ 1529 -h | --help Print a help message.\n\ 1530 -o FILE | --output-file FILE Write output to FILE.\n\ 1531 --only-keep-debug Keep debugging information only.\n\ 1532 -p | --preserve-dates Preserve access and modification times.\n\ 1533 -s | --strip-all Remove all symbols.\n\ 1534 --strip-unneeded Remove symbols not needed for relocation\n\ 1535 processing.\n\ 1536 -w | --wildcard Use shell-style patterns to name symbols.\n\ 1537 -x | --discard-all Discard all non-global symbols.\n\ 1538 -I TGT| --input-target=TGT (Accepted, but ignored).\n\ 1539 -K SYM | --keep-symbol=SYM Keep symbol 'SYM' in the output.\n\ 1540 -N SYM | --strip-symbol=SYM Remove symbol 'SYM' from the output.\n\ 1541 -O TGT | --output-target=TGT Set the output file format to 'TGT'.\n\ 1542 -R SEC | --remove-section=SEC Remove the section named 'SEC'.\n\ 1543 -V | --version Print a version identifier and exit.\n\ 1544 -X | --discard-locals Remove compiler-generated local symbols.\n" 1545 1546 static void 1547 strip_usage(void) 1548 { 1549 (void) fprintf(stderr, STRIP_USAGE_MESSAGE, ELFTC_GETPROGNAME()); 1550 exit(EXIT_FAILURE); 1551 } 1552 1553 static void 1554 print_version(void) 1555 { 1556 (void) printf("%s (%s)\n", ELFTC_GETPROGNAME(), elftc_version()); 1557 exit(EXIT_SUCCESS); 1558 } 1559 1560 /* 1561 * Compare the ending of s with end. 1562 */ 1563 static int 1564 strrcmp(const char *s, const char *end) 1565 { 1566 size_t endlen, slen; 1567 1568 slen = strlen(s); 1569 endlen = strlen(end); 1570 1571 if (slen >= endlen) 1572 s += slen - endlen; 1573 return (strcmp(s, end)); 1574 } 1575 1576 int 1577 main(int argc, char **argv) 1578 { 1579 struct elfcopy *ecp; 1580 1581 if (elf_version(EV_CURRENT) == EV_NONE) 1582 errx(EXIT_FAILURE, "ELF library initialization failed: %s", 1583 elf_errmsg(-1)); 1584 1585 ecp = calloc(1, sizeof(*ecp)); 1586 if (ecp == NULL) 1587 err(EXIT_FAILURE, "calloc failed"); 1588 1589 ecp->itf = ecp->otf = ETF_ELF; 1590 ecp->iec = ecp->oec = ELFCLASSNONE; 1591 ecp->oed = ELFDATANONE; 1592 ecp->abi = -1; 1593 /* There is always an empty section. */ 1594 ecp->nos = 1; 1595 ecp->fill = 0; 1596 1597 STAILQ_INIT(&ecp->v_seg); 1598 STAILQ_INIT(&ecp->v_sac); 1599 STAILQ_INIT(&ecp->v_sadd); 1600 STAILQ_INIT(&ecp->v_symop); 1601 STAILQ_INIT(&ecp->v_symfile); 1602 STAILQ_INIT(&ecp->v_arobj); 1603 TAILQ_INIT(&ecp->v_sec); 1604 1605 if ((ecp->progname = ELFTC_GETPROGNAME()) == NULL) 1606 ecp->progname = "elfcopy"; 1607 1608 if (strrcmp(ecp->progname, "strip") == 0) 1609 strip_main(ecp, argc, argv); 1610 else if (strrcmp(ecp->progname, "mcs") == 0) 1611 mcs_main(ecp, argc, argv); 1612 else { 1613 if (strrcmp(ecp->progname, "elfcopy") != 0 && 1614 strrcmp(ecp->progname, "objcopy") != 0) 1615 warnx("program mode not known, defaulting to elfcopy"); 1616 elfcopy_main(ecp, argc, argv); 1617 } 1618 1619 free_sec_add(ecp); 1620 free_sec_act(ecp); 1621 free(ecp); 1622 1623 exit(EXIT_SUCCESS); 1624 } 1625