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 /* 514 * Remove a temporary file, without freeing its filename. 515 * 516 * Safe to pass NULL, will just ignore it. 517 */ 518 int 519 cleanup_tempfile(char *fn) 520 { 521 int errno_save, retval; 522 523 if (fn == NULL) 524 return 0; 525 errno_save = errno; 526 if ((retval = unlink(fn)) < 0) { 527 warn("unlink tempfile %s failed", fn); 528 errno = errno_save; 529 return retval; 530 } 531 return 0; 532 } 533 534 /* Create a temporary file. */ 535 void 536 create_tempfile(const char *src, char **fn, int *fd) 537 { 538 static const char _TEMPDIR[] = "/tmp/"; 539 static const char _TEMPFILE[] = "ecp.XXXXXXXX"; 540 const char *tmpdir; 541 char *tmpf; 542 size_t tlen, slen, plen; 543 544 if (fn == NULL || fd == NULL) 545 return; 546 for (;;) { 547 if (src == NULL) { 548 /* Respect TMPDIR environment variable. */ 549 tmpdir = getenv("TMPDIR"); 550 if (tmpdir == NULL || *tmpdir == '\0') 551 tmpdir = _TEMPDIR; 552 tlen = strlen(tmpdir); 553 slen = tmpdir[tlen - 1] == '/' ? 0 : 1; 554 } else { 555 /* Create temporary file relative to source file. */ 556 if ((tmpdir = strrchr(src, '/')) == NULL) { 557 /* No path, only use a template filename. */ 558 tlen = 0; 559 } else { 560 /* Append the template after the slash. */ 561 tlen = ++tmpdir - src; 562 tmpdir = src; 563 } 564 slen = 0; 565 } 566 plen = strlen(_TEMPFILE) + 1; 567 tmpf = malloc(tlen + slen + plen); 568 if (tmpf == NULL) 569 err(EXIT_FAILURE, "malloc failed"); 570 if (tlen > 0) 571 memcpy(tmpf, tmpdir, tlen); 572 if (slen > 0) 573 tmpf[tlen] = '/'; 574 /* Copy template filename including NUL terminator. */ 575 memcpy(tmpf + tlen + slen, _TEMPFILE, plen); 576 if ((*fd = mkstemp(tmpf)) != -1) 577 break; 578 if (errno != EACCES || src == NULL) 579 err(EXIT_FAILURE, "mkstemp %s failed", tmpf); 580 /* Permission denied, try again using TMPDIR or /tmp. */ 581 free(tmpf); 582 src = NULL; 583 } 584 if (fchmod(*fd, 0644) == -1) 585 err(EXIT_FAILURE, "fchmod %s failed", tmpf); 586 *fn = tmpf; 587 } 588 589 /* 590 * Copy temporary file with path src and file descriptor infd to path dst. 591 * If in_place is set act as if editing the file in place, avoiding rename() 592 * to preserve hard and symbolic links. Output file remains open, with file 593 * descriptor returned in outfd. 594 */ 595 static int 596 copy_from_tempfile(const char *src, const char *dst, int infd, int *outfd, 597 int in_place) 598 { 599 int tmpfd; 600 601 /* 602 * First, check if we can use rename(). 603 */ 604 if (in_place == 0) { 605 if (rename(src, dst) >= 0) { 606 *outfd = infd; 607 return (0); 608 } else if (errno != EXDEV && errno != EACCES) 609 return (-1); 610 611 /* 612 * If the rename() failed due to 'src' and 'dst' residing in 613 * two different file systems, invoke a helper function in 614 * libelftc to do the copy. 615 */ 616 617 if (errno != EACCES && unlink(dst) < 0) 618 return (-1); 619 } 620 621 if ((tmpfd = open(dst, O_CREAT | O_TRUNC | O_WRONLY, 0755)) < 0) 622 return (-1); 623 624 if (elftc_copyfile(infd, tmpfd) < 0) { 625 (void) close(tmpfd); 626 return (-1); 627 } 628 629 /* 630 * Remove the temporary file from the file system 631 * namespace, and close its file descriptor. 632 */ 633 if (unlink(src) < 0) { 634 (void) close(tmpfd); 635 return (-1); 636 } 637 638 (void) close(infd); 639 640 /* 641 * Return the file descriptor for the destination. 642 */ 643 *outfd = tmpfd; 644 645 return (0); 646 } 647 648 static void 649 create_file(struct elfcopy *ecp, const char *src, const char *dst) 650 { 651 struct stat sb; 652 char *tempfile, *elftemp; 653 int efd, ifd, ofd, ofd0, tfd; 654 int in_place; 655 656 tempfile = NULL; 657 658 if (src == NULL) 659 errx(EXIT_FAILURE, "internal: src == NULL"); 660 if ((ifd = open(src, O_RDONLY)) == -1) 661 err(EXIT_FAILURE, "open %s failed", src); 662 663 if (fstat(ifd, &sb) == -1) 664 err(EXIT_FAILURE, "fstat %s failed", src); 665 666 if (dst == NULL) 667 create_tempfile(src, &tempfile, &ofd); 668 else 669 if ((ofd = open(dst, O_RDWR|O_CREAT, 0755)) == -1) 670 err(EXIT_FAILURE, "open %s failed", dst); 671 672 #ifndef LIBELF_AR 673 /* Detect and process ar(1) archive using libarchive. */ 674 if (ac_detect_ar(ifd)) { 675 ac_create_ar(ecp, ifd, ofd); 676 goto copy_done; 677 } 678 #endif 679 680 if (lseek(ifd, 0, SEEK_SET) < 0) { 681 cleanup_tempfile(tempfile); 682 err(EXIT_FAILURE, "lseek failed"); 683 } 684 685 /* 686 * If input object is not ELF file, convert it to an intermediate 687 * ELF object before processing. 688 */ 689 if (ecp->itf != ETF_ELF) { 690 /* 691 * If the output object is not an ELF file, choose an arbitrary 692 * ELF format for the intermediate file. srec, ihex and binary 693 * formats are independent of class, endianness and machine 694 * type so these choices do not affect the output. 695 */ 696 if (ecp->otf != ETF_ELF) { 697 if (ecp->oec == ELFCLASSNONE) 698 ecp->oec = ELFCLASS64; 699 if (ecp->oed == ELFDATANONE) 700 ecp->oed = ELFDATA2LSB; 701 } 702 create_tempfile(src, &elftemp, &efd); 703 if ((ecp->eout = elf_begin(efd, ELF_C_WRITE, NULL)) == NULL) { 704 cleanup_tempfile(elftemp); 705 cleanup_tempfile(tempfile); 706 errx(EXIT_FAILURE, "elf_begin() failed: %s", 707 elf_errmsg(-1)); 708 } 709 elf_flagelf(ecp->eout, ELF_C_SET, ELF_F_LAYOUT); 710 if (ecp->itf == ETF_BINARY) 711 create_elf_from_binary(ecp, ifd, src); 712 else if (ecp->itf == ETF_IHEX) 713 create_elf_from_ihex(ecp, ifd); 714 else if (ecp->itf == ETF_SREC) 715 create_elf_from_srec(ecp, ifd); 716 else { 717 cleanup_tempfile(elftemp); 718 cleanup_tempfile(tempfile); 719 errx(EXIT_FAILURE, "Internal: invalid target flavour"); 720 } 721 elf_end(ecp->eout); 722 723 /* Open intermediate ELF object as new input object. */ 724 close(ifd); 725 if ((ifd = open(elftemp, O_RDONLY)) == -1) { 726 cleanup_tempfile(elftemp); 727 cleanup_tempfile(tempfile); 728 err(EXIT_FAILURE, "open %s failed", src); 729 } 730 close(efd); 731 if (cleanup_tempfile(elftemp) < 0) { 732 cleanup_tempfile(tempfile); 733 err(EXIT_FAILURE, "unlink %s failed", elftemp); 734 } 735 free(elftemp); 736 elftemp = NULL; 737 } 738 739 if ((ecp->ein = elf_begin(ifd, ELF_C_READ, NULL)) == NULL) { 740 cleanup_tempfile(tempfile); 741 errx(EXIT_FAILURE, "elf_begin() failed: %s", 742 elf_errmsg(-1)); 743 } 744 745 switch (elf_kind(ecp->ein)) { 746 case ELF_K_NONE: 747 cleanup_tempfile(tempfile); 748 errx(EXIT_FAILURE, "file format not recognized"); 749 case ELF_K_ELF: 750 if ((ecp->eout = elf_begin(ofd, ELF_C_WRITE, NULL)) == NULL) { 751 cleanup_tempfile(tempfile); 752 errx(EXIT_FAILURE, "elf_begin() failed: %s", 753 elf_errmsg(-1)); 754 } 755 756 /* elfcopy(1) manage ELF layout by itself. */ 757 elf_flagelf(ecp->eout, ELF_C_SET, ELF_F_LAYOUT); 758 759 /* 760 * Create output ELF object. 761 */ 762 create_elf(ecp); 763 elf_end(ecp->eout); 764 765 /* 766 * Convert the output ELF object to binary/srec/ihex if need. 767 */ 768 if (ecp->otf != ETF_ELF) { 769 /* 770 * Create (another) tempfile for binary/srec/ihex 771 * output object. 772 */ 773 if (cleanup_tempfile(tempfile) < 0) 774 errx(EXIT_FAILURE, "unlink %s failed", 775 tempfile); 776 free(tempfile); 777 create_tempfile(src, &tempfile, &ofd0); 778 779 780 /* 781 * Rewind the file descriptor being processed. 782 */ 783 if (lseek(ofd, 0, SEEK_SET) < 0) { 784 cleanup_tempfile(tempfile); 785 err(EXIT_FAILURE, 786 "lseek failed for the output object"); 787 } 788 789 /* 790 * Call flavour-specific conversion routine. 791 */ 792 switch (ecp->otf) { 793 case ETF_BINARY: 794 create_binary(ofd, ofd0); 795 break; 796 case ETF_IHEX: 797 create_ihex(ofd, ofd0); 798 break; 799 case ETF_SREC: 800 create_srec(ecp, ofd, ofd0, 801 dst != NULL ? dst : src); 802 break; 803 case ETF_PE: 804 case ETF_EFI: 805 #if WITH_PE 806 create_pe(ecp, ofd, ofd0); 807 #else 808 cleanup_tempfile(tempfile); 809 errx(EXIT_FAILURE, "PE/EFI support not enabled" 810 " at compile time"); 811 #endif 812 break; 813 default: 814 cleanup_tempfile(tempfile); 815 errx(EXIT_FAILURE, "Internal: unsupported" 816 " output flavour %d", ecp->oec); 817 } 818 819 close(ofd); 820 ofd = ofd0; 821 } 822 823 break; 824 825 case ELF_K_AR: 826 /* XXX: Not yet supported. */ 827 break; 828 default: 829 cleanup_tempfile(tempfile); 830 errx(EXIT_FAILURE, "file format not supported"); 831 } 832 833 elf_end(ecp->ein); 834 835 #ifndef LIBELF_AR 836 copy_done: 837 #endif 838 839 if (tempfile != NULL) { 840 in_place = 0; 841 if (dst == NULL) { 842 dst = src; 843 if (lstat(dst, &sb) != -1 && 844 (sb.st_nlink > 1 || S_ISLNK(sb.st_mode))) 845 in_place = 1; 846 } 847 848 if (copy_from_tempfile(tempfile, dst, ofd, 849 &tfd, in_place) < 0) { 850 cleanup_tempfile(tempfile); 851 err(EXIT_FAILURE, "creation of %s failed", dst); 852 } 853 854 /* 'tempfile' has been removed by copy_from_tempfile(). */ 855 free(tempfile); 856 tempfile = NULL; 857 858 ofd = tfd; 859 } 860 861 if (strcmp(dst, "/dev/null") && fchmod(ofd, sb.st_mode) == -1) 862 err(EXIT_FAILURE, "fchmod %s failed", dst); 863 864 if ((ecp->flags & PRESERVE_DATE) && 865 elftc_set_timestamps(dst, &sb) < 0) 866 err(EXIT_FAILURE, "setting timestamps failed"); 867 868 close(ifd); 869 close(ofd); 870 } 871 872 static void 873 elfcopy_main(struct elfcopy *ecp, int argc, char **argv) 874 { 875 struct sec_action *sac; 876 const char *infile, *outfile; 877 char *fn, *s; 878 int opt; 879 880 while ((opt = getopt_long(argc, argv, "dB:gG:I:j:K:L:N:O:pR:s:SwW:xXV", 881 elfcopy_longopts, NULL)) != -1) { 882 switch(opt) { 883 case 'B': 884 /* ignored */ 885 break; 886 case 'R': 887 sac = lookup_sec_act(ecp, optarg, 1); 888 if (sac->copy != 0) 889 errx(EXIT_FAILURE, 890 "both copy and remove specified"); 891 sac->remove = 1; 892 ecp->flags |= SEC_REMOVE; 893 break; 894 case 'S': 895 ecp->strip = STRIP_ALL; 896 break; 897 case 'g': 898 ecp->strip = STRIP_DEBUG; 899 break; 900 case 'G': 901 ecp->flags |= KEEP_GLOBAL; 902 add_to_symop_list(ecp, optarg, NULL, SYMOP_KEEPG); 903 break; 904 case 'I': 905 case 's': 906 set_input_target(ecp, optarg); 907 break; 908 case 'j': 909 sac = lookup_sec_act(ecp, optarg, 1); 910 if (sac->remove != 0) 911 errx(EXIT_FAILURE, 912 "both copy and remove specified"); 913 sac->copy = 1; 914 ecp->flags |= SEC_COPY; 915 break; 916 case 'K': 917 add_to_symop_list(ecp, optarg, NULL, SYMOP_KEEP); 918 break; 919 case 'L': 920 add_to_symop_list(ecp, optarg, NULL, SYMOP_LOCALIZE); 921 break; 922 case 'N': 923 add_to_symop_list(ecp, optarg, NULL, SYMOP_STRIP); 924 break; 925 case 'O': 926 set_output_target(ecp, optarg); 927 break; 928 case 'p': 929 ecp->flags |= PRESERVE_DATE; 930 break; 931 case 'V': 932 print_version(); 933 break; 934 case 'w': 935 ecp->flags |= WILDCARD; 936 break; 937 case 'W': 938 add_to_symop_list(ecp, optarg, NULL, SYMOP_WEAKEN); 939 break; 940 case 'x': 941 ecp->flags |= DISCARD_LOCAL; 942 break; 943 case 'X': 944 ecp->flags |= DISCARD_LLABEL; 945 break; 946 case ECP_ADD_GNU_DEBUGLINK: 947 ecp->debuglink = optarg; 948 break; 949 case ECP_ADD_SECTION: 950 add_section(ecp, optarg); 951 break; 952 case ECP_CHANGE_ADDR: 953 ecp->change_addr = (int64_t) strtoll(optarg, NULL, 0); 954 break; 955 case ECP_CHANGE_SEC_ADDR: 956 parse_sec_address_op(ecp, opt, "--change-section-addr", 957 optarg); 958 break; 959 case ECP_CHANGE_SEC_LMA: 960 parse_sec_address_op(ecp, opt, "--change-section-lma", 961 optarg); 962 break; 963 case ECP_CHANGE_SEC_VMA: 964 parse_sec_address_op(ecp, opt, "--change-section-vma", 965 optarg); 966 break; 967 case ECP_CHANGE_START: 968 ecp->change_start = (int64_t) strtoll(optarg, NULL, 0); 969 break; 970 case ECP_CHANGE_WARN: 971 /* default */ 972 break; 973 case ECP_GAP_FILL: 974 ecp->fill = (uint8_t) strtoul(optarg, NULL, 0); 975 ecp->flags |= GAP_FILL; 976 break; 977 case ECP_GLOBALIZE_SYMBOL: 978 add_to_symop_list(ecp, optarg, NULL, SYMOP_GLOBALIZE); 979 break; 980 case ECP_GLOBALIZE_SYMBOLS: 981 parse_symlist_file(ecp, optarg, SYMOP_GLOBALIZE); 982 break; 983 case ECP_KEEP_SYMBOLS: 984 parse_symlist_file(ecp, optarg, SYMOP_KEEP); 985 break; 986 case ECP_KEEP_GLOBAL_SYMBOLS: 987 parse_symlist_file(ecp, optarg, SYMOP_KEEPG); 988 break; 989 case ECP_LOCALIZE_HIDDEN: 990 ecp->flags |= LOCALIZE_HIDDEN; 991 break; 992 case ECP_LOCALIZE_SYMBOLS: 993 parse_symlist_file(ecp, optarg, SYMOP_LOCALIZE); 994 break; 995 case ECP_NO_CHANGE_WARN: 996 ecp->flags |= NO_CHANGE_WARN; 997 break; 998 case ECP_ONLY_DEBUG: 999 ecp->strip = STRIP_NONDEBUG; 1000 break; 1001 case ECP_ONLY_DWO: 1002 ecp->strip = STRIP_NONDWO; 1003 break; 1004 case ECP_PAD_TO: 1005 ecp->pad_to = (uint64_t) strtoull(optarg, NULL, 0); 1006 break; 1007 case ECP_PREFIX_ALLOC: 1008 ecp->prefix_alloc = optarg; 1009 break; 1010 case ECP_PREFIX_SEC: 1011 ecp->prefix_sec = optarg; 1012 break; 1013 case ECP_PREFIX_SYM: 1014 ecp->prefix_sym = optarg; 1015 break; 1016 case ECP_REDEF_SYMBOL: 1017 if ((s = strchr(optarg, '=')) == NULL) 1018 errx(EXIT_FAILURE, 1019 "illegal format for --redefine-sym"); 1020 *s++ = '\0'; 1021 add_to_symop_list(ecp, optarg, s, SYMOP_REDEF); 1022 break; 1023 case ECP_REDEF_SYMBOLS: 1024 parse_symlist_file(ecp, optarg, SYMOP_REDEF); 1025 break; 1026 case ECP_RENAME_SECTION: 1027 if ((fn = strchr(optarg, '=')) == NULL) 1028 errx(EXIT_FAILURE, 1029 "illegal format for --rename-section"); 1030 *fn++ = '\0'; 1031 1032 /* Check for optional flags. */ 1033 if ((s = strchr(fn, ',')) != NULL) 1034 *s++ = '\0'; 1035 1036 sac = lookup_sec_act(ecp, optarg, 1); 1037 sac->rename = 1; 1038 sac->newname = fn; 1039 if (s != NULL) 1040 parse_sec_flags(sac, s); 1041 break; 1042 case ECP_SET_OSABI: 1043 set_osabi(ecp, optarg); 1044 break; 1045 case ECP_SET_SEC_FLAGS: 1046 if ((s = strchr(optarg, '=')) == NULL) 1047 errx(EXIT_FAILURE, 1048 "illegal format for --set-section-flags"); 1049 *s++ = '\0'; 1050 sac = lookup_sec_act(ecp, optarg, 1); 1051 parse_sec_flags(sac, s); 1052 break; 1053 case ECP_SET_START: 1054 ecp->flags |= SET_START; 1055 ecp->set_start = (uint64_t) strtoull(optarg, NULL, 0); 1056 break; 1057 case ECP_SREC_FORCE_S3: 1058 ecp->flags |= SREC_FORCE_S3; 1059 break; 1060 case ECP_SREC_LEN: 1061 ecp->flags |= SREC_FORCE_LEN; 1062 ecp->srec_len = strtoul(optarg, NULL, 0); 1063 break; 1064 case ECP_STRIP_DWO: 1065 ecp->strip = STRIP_DWO; 1066 break; 1067 case ECP_STRIP_SYMBOLS: 1068 parse_symlist_file(ecp, optarg, SYMOP_STRIP); 1069 break; 1070 case ECP_STRIP_UNNEEDED: 1071 ecp->strip = STRIP_UNNEEDED; 1072 break; 1073 case ECP_WEAKEN_ALL: 1074 ecp->flags |= WEAKEN_ALL; 1075 break; 1076 case ECP_WEAKEN_SYMBOLS: 1077 parse_symlist_file(ecp, optarg, SYMOP_WEAKEN); 1078 break; 1079 default: 1080 elfcopy_usage(); 1081 } 1082 } 1083 1084 argc -= optind; 1085 argv += optind; 1086 1087 if (argc == 0 || argc > 2) 1088 elfcopy_usage(); 1089 1090 infile = argv[0]; 1091 outfile = NULL; 1092 if (argc > 1) 1093 outfile = argv[1]; 1094 1095 create_file(ecp, infile, outfile); 1096 } 1097 1098 static void 1099 mcs_main(struct elfcopy *ecp, int argc, char **argv) 1100 { 1101 struct sec_action *sac; 1102 const char *string; 1103 int append, delete, compress, name, print; 1104 int opt, i; 1105 1106 append = delete = compress = name = print = 0; 1107 string = NULL; 1108 while ((opt = getopt_long(argc, argv, "a:cdhn:pV", mcs_longopts, 1109 NULL)) != -1) { 1110 switch(opt) { 1111 case 'a': 1112 append = 1; 1113 string = optarg; /* XXX multiple -a not supported */ 1114 break; 1115 case 'c': 1116 compress = 1; 1117 break; 1118 case 'd': 1119 delete = 1; 1120 break; 1121 case 'n': 1122 name = 1; 1123 (void)lookup_sec_act(ecp, optarg, 1); 1124 break; 1125 case 'p': 1126 print = 1; 1127 break; 1128 case 'V': 1129 print_version(); 1130 break; 1131 case 'h': 1132 default: 1133 mcs_usage(); 1134 } 1135 } 1136 1137 argc -= optind; 1138 argv += optind; 1139 1140 if (argc == 0) 1141 mcs_usage(); 1142 1143 /* Must specify one operation at least. */ 1144 if (!append && !compress && !delete && !print) 1145 mcs_usage(); 1146 1147 /* 1148 * If we are going to delete, ignore other operations. This is 1149 * different from the Solaris implementation, which can print 1150 * and delete a section at the same time, for example. Also, this 1151 * implementation do not respect the order between operations that 1152 * user specified, i.e., "mcs -pc a.out" equals to "mcs -cp a.out". 1153 */ 1154 if (delete) { 1155 append = compress = print = 0; 1156 ecp->flags |= SEC_REMOVE; 1157 } 1158 if (append) 1159 ecp->flags |= SEC_APPEND; 1160 if (compress) 1161 ecp->flags |= SEC_COMPRESS; 1162 if (print) 1163 ecp->flags |= SEC_PRINT; 1164 1165 /* .comment is the default section to operate on. */ 1166 if (!name) 1167 (void)lookup_sec_act(ecp, ".comment", 1); 1168 1169 STAILQ_FOREACH(sac, &ecp->v_sac, sac_list) { 1170 sac->append = append; 1171 sac->compress = compress; 1172 sac->print = print; 1173 sac->remove = delete; 1174 sac->string = string; 1175 } 1176 1177 for (i = 0; i < argc; i++) { 1178 /* If only -p is specified, output to /dev/null */ 1179 if (print && !append && !compress && !delete) 1180 create_file(ecp, argv[i], "/dev/null"); 1181 else 1182 create_file(ecp, argv[i], NULL); 1183 } 1184 } 1185 1186 static void 1187 strip_main(struct elfcopy *ecp, int argc, char **argv) 1188 { 1189 struct sec_action *sac; 1190 const char *outfile; 1191 int opt; 1192 int i; 1193 1194 outfile = NULL; 1195 while ((opt = getopt_long(argc, argv, "hI:K:N:o:O:pR:sSdgVxXw", 1196 strip_longopts, NULL)) != -1) { 1197 switch(opt) { 1198 case 'R': 1199 sac = lookup_sec_act(ecp, optarg, 1); 1200 sac->remove = 1; 1201 ecp->flags |= SEC_REMOVE; 1202 break; 1203 case 's': 1204 ecp->strip = STRIP_ALL; 1205 break; 1206 case 'S': 1207 case 'g': 1208 case 'd': 1209 ecp->strip = STRIP_DEBUG; 1210 break; 1211 case 'I': 1212 /* ignored */ 1213 break; 1214 case 'K': 1215 add_to_symop_list(ecp, optarg, NULL, SYMOP_KEEP); 1216 break; 1217 case 'N': 1218 add_to_symop_list(ecp, optarg, NULL, SYMOP_STRIP); 1219 break; 1220 case 'o': 1221 outfile = optarg; 1222 break; 1223 case 'O': 1224 set_output_target(ecp, optarg); 1225 break; 1226 case 'p': 1227 ecp->flags |= PRESERVE_DATE; 1228 break; 1229 case 'V': 1230 print_version(); 1231 break; 1232 case 'w': 1233 ecp->flags |= WILDCARD; 1234 break; 1235 case 'x': 1236 ecp->flags |= DISCARD_LOCAL; 1237 break; 1238 case 'X': 1239 ecp->flags |= DISCARD_LLABEL; 1240 break; 1241 case ECP_ONLY_DEBUG: 1242 ecp->strip = STRIP_NONDEBUG; 1243 break; 1244 case ECP_STRIP_UNNEEDED: 1245 ecp->strip = STRIP_UNNEEDED; 1246 break; 1247 case 'h': 1248 default: 1249 strip_usage(); 1250 } 1251 } 1252 1253 argc -= optind; 1254 argv += optind; 1255 1256 if (ecp->strip == 0 && 1257 ((ecp->flags & DISCARD_LOCAL) == 0) && 1258 ((ecp->flags & DISCARD_LLABEL) == 0) && 1259 lookup_symop_list(ecp, NULL, SYMOP_STRIP) == NULL) 1260 ecp->strip = STRIP_ALL; 1261 if (argc == 0) 1262 strip_usage(); 1263 /* 1264 * Only accept a single input file if an output file had been 1265 * specified. 1266 */ 1267 if (outfile != NULL && argc != 1) 1268 strip_usage(); 1269 1270 for (i = 0; i < argc; i++) 1271 create_file(ecp, argv[i], outfile); 1272 } 1273 1274 static void 1275 parse_sec_flags(struct sec_action *sac, char *s) 1276 { 1277 const char *flag; 1278 int found, i; 1279 1280 for (flag = strtok(s, ","); flag; flag = strtok(NULL, ",")) { 1281 found = 0; 1282 for (i = 0; sec_flags[i].name != NULL; i++) 1283 if (strcasecmp(sec_flags[i].name, flag) == 0) { 1284 sac->flags |= sec_flags[i].value; 1285 found = 1; 1286 break; 1287 } 1288 if (!found) 1289 errx(EXIT_FAILURE, "unrecognized section flag %s", 1290 flag); 1291 } 1292 } 1293 1294 static void 1295 parse_sec_address_op(struct elfcopy *ecp, int optnum, const char *optname, 1296 char *s) 1297 { 1298 struct sec_action *sac; 1299 const char *name; 1300 char *v; 1301 char op; 1302 1303 name = v = s; 1304 do { 1305 v++; 1306 } while (*v != '\0' && *v != '=' && *v != '+' && *v != '-'); 1307 if (*v == '\0' || *(v + 1) == '\0') 1308 errx(EXIT_FAILURE, "invalid format for %s", optname); 1309 op = *v; 1310 *v++ = '\0'; 1311 sac = lookup_sec_act(ecp, name, 1); 1312 switch (op) { 1313 case '=': 1314 if (optnum == ECP_CHANGE_SEC_LMA || 1315 optnum == ECP_CHANGE_SEC_ADDR) { 1316 sac->setlma = 1; 1317 sac->lma = (uint64_t) strtoull(v, NULL, 0); 1318 } 1319 if (optnum == ECP_CHANGE_SEC_VMA || 1320 optnum == ECP_CHANGE_SEC_ADDR) { 1321 sac->setvma = 1; 1322 sac->vma = (uint64_t) strtoull(v, NULL, 0); 1323 } 1324 break; 1325 case '+': 1326 if (optnum == ECP_CHANGE_SEC_LMA || 1327 optnum == ECP_CHANGE_SEC_ADDR) 1328 sac->lma_adjust = (int64_t) strtoll(v, NULL, 0); 1329 if (optnum == ECP_CHANGE_SEC_VMA || 1330 optnum == ECP_CHANGE_SEC_ADDR) 1331 sac->vma_adjust = (int64_t) strtoll(v, NULL, 0); 1332 break; 1333 case '-': 1334 if (optnum == ECP_CHANGE_SEC_LMA || 1335 optnum == ECP_CHANGE_SEC_ADDR) 1336 sac->lma_adjust = (int64_t) -strtoll(v, NULL, 0); 1337 if (optnum == ECP_CHANGE_SEC_VMA || 1338 optnum == ECP_CHANGE_SEC_ADDR) 1339 sac->vma_adjust = (int64_t) -strtoll(v, NULL, 0); 1340 break; 1341 default: 1342 break; 1343 } 1344 } 1345 1346 static void 1347 parse_symlist_file(struct elfcopy *ecp, const char *fn, unsigned int op) 1348 { 1349 struct symfile *sf; 1350 struct stat sb; 1351 FILE *fp; 1352 char *data, *p, *line, *end, *e, *n; 1353 1354 if (stat(fn, &sb) == -1) 1355 err(EXIT_FAILURE, "stat %s failed", fn); 1356 1357 /* Check if we already read and processed this file. */ 1358 STAILQ_FOREACH(sf, &ecp->v_symfile, symfile_list) { 1359 if (sf->dev == sb.st_dev && sf->ino == sb.st_ino) 1360 goto process_symfile; 1361 } 1362 1363 if ((fp = fopen(fn, "r")) == NULL) 1364 err(EXIT_FAILURE, "can not open %s", fn); 1365 if ((data = malloc(sb.st_size + 1)) == NULL) 1366 err(EXIT_FAILURE, "malloc failed"); 1367 if (sb.st_size > 0) 1368 if (fread(data, sb.st_size, 1, fp) != 1) 1369 err(EXIT_FAILURE, "fread failed"); 1370 fclose(fp); 1371 data[sb.st_size] = '\0'; 1372 1373 if ((sf = calloc(1, sizeof(*sf))) == NULL) 1374 err(EXIT_FAILURE, "malloc failed"); 1375 sf->dev = sb.st_dev; 1376 sf->ino = sb.st_ino; 1377 sf->size = sb.st_size + 1; 1378 sf->data = data; 1379 1380 process_symfile: 1381 1382 /* 1383 * Basically what we do here is to convert EOL to '\0', and remove 1384 * leading and trailing whitespaces for each line. 1385 */ 1386 1387 end = sf->data + sf->size; 1388 line = NULL; 1389 for(p = sf->data; p < end; p++) { 1390 if ((*p == '\t' || *p == ' ') && line == NULL) 1391 continue; 1392 if (*p == '\r' || *p == '\n' || *p == '\0') { 1393 *p = '\0'; 1394 if (line == NULL) 1395 continue; 1396 1397 /* Skip comment. */ 1398 if (*line == '#') { 1399 line = NULL; 1400 continue; 1401 } 1402 1403 e = p - 1; 1404 while(e != line && (*e == '\t' || *e == ' ')) 1405 *e-- = '\0'; 1406 if (op != SYMOP_REDEF) 1407 add_to_symop_list(ecp, line, NULL, op); 1408 else { 1409 if (strlen(line) < 3) 1410 errx(EXIT_FAILURE, 1411 "illegal format for" 1412 " --redefine-sym"); 1413 for(n = line + 1; n < e; n++) { 1414 if (*n == ' ' || *n == '\t') { 1415 while(*n == ' ' || *n == '\t') 1416 *n++ = '\0'; 1417 break; 1418 } 1419 } 1420 if (n >= e) 1421 errx(EXIT_FAILURE, 1422 "illegal format for" 1423 " --redefine-sym"); 1424 add_to_symop_list(ecp, line, n, op); 1425 } 1426 line = NULL; 1427 continue; 1428 } 1429 1430 if (line == NULL) 1431 line = p; 1432 } 1433 } 1434 1435 static void 1436 set_input_target(struct elfcopy *ecp, const char *target_name) 1437 { 1438 Elftc_Bfd_Target *tgt; 1439 1440 if ((tgt = elftc_bfd_find_target(target_name)) == NULL) 1441 errx(EXIT_FAILURE, "%s: invalid target name", target_name); 1442 ecp->itf = elftc_bfd_target_flavor(tgt); 1443 } 1444 1445 static void 1446 set_output_target(struct elfcopy *ecp, const char *target_name) 1447 { 1448 Elftc_Bfd_Target *tgt; 1449 1450 if ((tgt = elftc_bfd_find_target(target_name)) == NULL) 1451 errx(EXIT_FAILURE, "%s: invalid target name", target_name); 1452 ecp->otf = elftc_bfd_target_flavor(tgt); 1453 if (ecp->otf == ETF_ELF) { 1454 ecp->oec = elftc_bfd_target_class(tgt); 1455 ecp->oed = elftc_bfd_target_byteorder(tgt); 1456 ecp->oem = elftc_bfd_target_machine(tgt); 1457 ecp->abi = elftc_bfd_target_osabi(tgt); 1458 } 1459 if (ecp->otf == ETF_EFI || ecp->otf == ETF_PE) 1460 ecp->oem = elftc_bfd_target_machine(tgt); 1461 1462 ecp->otgt = target_name; 1463 } 1464 1465 static void 1466 set_osabi(struct elfcopy *ecp, const char *abi) 1467 { 1468 int i, found; 1469 1470 found = 0; 1471 for (i = 0; osabis[i].name != NULL; i++) 1472 if (strcasecmp(osabis[i].name, abi) == 0) { 1473 ecp->abi = osabis[i].abi; 1474 found = 1; 1475 break; 1476 } 1477 if (!found) 1478 errx(EXIT_FAILURE, "unrecognized OSABI %s", abi); 1479 } 1480 1481 #define ELFCOPY_USAGE_MESSAGE "\ 1482 Usage: %s [options] infile [outfile]\n\ 1483 Transform object files.\n\n\ 1484 Options:\n\ 1485 -d | -g | --strip-debug Remove debugging information from the output.\n\ 1486 -j SECTION | --only-section=SECTION\n\ 1487 Copy only the named section to the output.\n\ 1488 -p | --preserve-dates Preserve access and modification times.\n\ 1489 -w | --wildcard Use shell-style patterns to name symbols.\n\ 1490 -x | --discard-all Do not copy non-globals to the output.\n\ 1491 -I FORMAT | --input-target=FORMAT\n\ 1492 Specify object format for the input file.\n\ 1493 -K SYM | --keep-symbol=SYM Copy symbol SYM to the output.\n\ 1494 -L SYM | --localize-symbol=SYM\n\ 1495 Make symbol SYM local to the output file.\n\ 1496 -N SYM | --strip-symbol=SYM Do not copy symbol SYM to the output.\n\ 1497 -O FORMAT | --output-target=FORMAT\n\ 1498 Specify object format for the output file.\n\ 1499 FORMAT should be a target name understood by\n\ 1500 elftc_bfd_find_target(3).\n\ 1501 -R NAME | --remove-section=NAME\n\ 1502 Remove the named section.\n\ 1503 -S | --strip-all Remove all symbol and relocation information\n\ 1504 from the output.\n\ 1505 -V | --version Print a version identifier and exit.\n\ 1506 -W SYM | --weaken-symbol=SYM Mark symbol SYM as weak in the output.\n\ 1507 -X | --discard-locals Do not copy compiler generated symbols to\n\ 1508 the output.\n\ 1509 --add-section NAME=FILE Add the contents of FILE to the ELF object as\n\ 1510 a new section named NAME.\n\ 1511 --adjust-section-vma SECTION{=,+,-}VAL | \\\n\ 1512 --change-section-address SECTION{=,+,-}VAL\n\ 1513 Set or adjust the VMA and the LMA of the\n\ 1514 named section by VAL.\n\ 1515 --adjust-start=INCR | --change-start=INCR\n\ 1516 Add INCR to the start address for the ELF\n\ 1517 object.\n\ 1518 --adjust-vma=INCR | --change-addresses=INCR\n\ 1519 Increase the VMA and LMA of all sections by\n\ 1520 INCR.\n\ 1521 --adjust-warning | --change-warnings\n\ 1522 Issue warnings for non-existent sections.\n\ 1523 --change-section-lma SECTION{=,+,-}VAL\n\ 1524 Set or adjust the LMA address of the named\n\ 1525 section by VAL.\n\ 1526 --change-section-vma SECTION{=,+,-}VAL\n\ 1527 Set or adjust the VMA address of the named\n\ 1528 section by VAL.\n\ 1529 --gap-fill=VAL Fill the gaps between sections with bytes\n\ 1530 of value VAL.\n\ 1531 --localize-hidden Make all hidden symbols local to the output\n\ 1532 file.\n\ 1533 --no-adjust-warning| --no-change-warnings\n\ 1534 Do not issue warnings for non-existent\n\ 1535 sections.\n\ 1536 --only-keep-debug Copy only debugging information.\n\ 1537 --output-target=FORMAT Use the specified format for the output.\n\ 1538 --pad-to=ADDRESS Pad the output object up to the given address.\n\ 1539 --prefix-alloc-sections=STRING\n\ 1540 Prefix the section names of all the allocated\n\ 1541 sections with STRING.\n\ 1542 --prefix-sections=STRING Prefix the section names of all the sections\n\ 1543 with STRING.\n\ 1544 --prefix-symbols=STRING Prefix the symbol names of all the symbols\n\ 1545 with STRING.\n\ 1546 --rename-section OLDNAME=NEWNAME[,FLAGS]\n\ 1547 Rename and optionally change section flags.\n\ 1548 --set-section-flags SECTION=FLAGS\n\ 1549 Set section flags for the named section.\n\ 1550 Supported flags are: 'alloc', 'code',\n\ 1551 'contents', 'data', 'debug', 'load',\n\ 1552 'noload', 'readonly', 'rom', and 'shared'.\n\ 1553 --set-start=ADDRESS Set the start address of the ELF object.\n\ 1554 --srec-forceS3 Only generate S3 S-Records.\n\ 1555 --srec-len=LEN Set the maximum length of a S-Record line.\n\ 1556 --strip-unneeded Do not copy relocation information.\n" 1557 1558 static void 1559 elfcopy_usage(void) 1560 { 1561 (void) fprintf(stderr, ELFCOPY_USAGE_MESSAGE, ELFTC_GETPROGNAME()); 1562 exit(EXIT_FAILURE); 1563 } 1564 1565 #define MCS_USAGE_MESSAGE "\ 1566 Usage: %s [options] file...\n\ 1567 Manipulate the comment section in an ELF object.\n\n\ 1568 Options:\n\ 1569 -a STRING Append 'STRING' to the comment section.\n\ 1570 -c Remove duplicate entries from the comment section.\n\ 1571 -d Delete the comment section.\n\ 1572 -h | --help Print a help message and exit.\n\ 1573 -n NAME Operate on the ELF section with name 'NAME'.\n\ 1574 -p Print the contents of the comment section.\n\ 1575 -V | --version Print a version identifier and exit.\n" 1576 1577 static void 1578 mcs_usage(void) 1579 { 1580 (void) fprintf(stderr, MCS_USAGE_MESSAGE, ELFTC_GETPROGNAME()); 1581 exit(EXIT_FAILURE); 1582 } 1583 1584 #define STRIP_USAGE_MESSAGE "\ 1585 Usage: %s [options] file...\n\ 1586 Discard information from ELF objects.\n\n\ 1587 Options:\n\ 1588 -d | -g | -S | --strip-debug Remove debugging symbols.\n\ 1589 -h | --help Print a help message.\n\ 1590 -o FILE | --output-file FILE Write output to FILE.\n\ 1591 --only-keep-debug Keep debugging information only.\n\ 1592 -p | --preserve-dates Preserve access and modification times.\n\ 1593 -s | --strip-all Remove all symbols.\n\ 1594 --strip-unneeded Remove symbols not needed for relocation\n\ 1595 processing.\n\ 1596 -w | --wildcard Use shell-style patterns to name symbols.\n\ 1597 -x | --discard-all Discard all non-global symbols.\n\ 1598 -I TGT| --input-target=TGT (Accepted, but ignored).\n\ 1599 -K SYM | --keep-symbol=SYM Keep symbol 'SYM' in the output.\n\ 1600 -N SYM | --strip-symbol=SYM Remove symbol 'SYM' from the output.\n\ 1601 -O TGT | --output-target=TGT Set the output file format to 'TGT'.\n\ 1602 -R SEC | --remove-section=SEC Remove the section named 'SEC'.\n\ 1603 -V | --version Print a version identifier and exit.\n\ 1604 -X | --discard-locals Remove compiler-generated local symbols.\n" 1605 1606 static void 1607 strip_usage(void) 1608 { 1609 (void) fprintf(stderr, STRIP_USAGE_MESSAGE, ELFTC_GETPROGNAME()); 1610 exit(EXIT_FAILURE); 1611 } 1612 1613 static void 1614 print_version(void) 1615 { 1616 (void) printf("%s (%s)\n", ELFTC_GETPROGNAME(), elftc_version()); 1617 exit(EXIT_SUCCESS); 1618 } 1619 1620 /* 1621 * Compare the ending of s with end. 1622 */ 1623 static int 1624 strrcmp(const char *s, const char *end) 1625 { 1626 size_t endlen, slen; 1627 1628 slen = strlen(s); 1629 endlen = strlen(end); 1630 1631 if (slen >= endlen) 1632 s += slen - endlen; 1633 return (strcmp(s, end)); 1634 } 1635 1636 int 1637 main(int argc, char **argv) 1638 { 1639 struct elfcopy *ecp; 1640 1641 if (elf_version(EV_CURRENT) == EV_NONE) 1642 errx(EXIT_FAILURE, "ELF library initialization failed: %s", 1643 elf_errmsg(-1)); 1644 1645 ecp = calloc(1, sizeof(*ecp)); 1646 if (ecp == NULL) 1647 err(EXIT_FAILURE, "calloc failed"); 1648 1649 ecp->itf = ecp->otf = ETF_ELF; 1650 ecp->iec = ecp->oec = ELFCLASSNONE; 1651 ecp->oed = ELFDATANONE; 1652 ecp->abi = -1; 1653 /* There is always an empty section. */ 1654 ecp->nos = 1; 1655 ecp->fill = 0; 1656 1657 STAILQ_INIT(&ecp->v_seg); 1658 STAILQ_INIT(&ecp->v_sac); 1659 STAILQ_INIT(&ecp->v_sadd); 1660 STAILQ_INIT(&ecp->v_symop); 1661 STAILQ_INIT(&ecp->v_symfile); 1662 STAILQ_INIT(&ecp->v_arobj); 1663 TAILQ_INIT(&ecp->v_sec); 1664 1665 if ((ecp->progname = ELFTC_GETPROGNAME()) == NULL) 1666 ecp->progname = "elfcopy"; 1667 1668 if (strrcmp(ecp->progname, "strip") == 0) 1669 strip_main(ecp, argc, argv); 1670 else if (strrcmp(ecp->progname, "mcs") == 0) 1671 mcs_main(ecp, argc, argv); 1672 else { 1673 if (strrcmp(ecp->progname, "elfcopy") != 0 && 1674 strrcmp(ecp->progname, "objcopy") != 0) 1675 warnx("program mode not known, defaulting to elfcopy"); 1676 elfcopy_main(ecp, argc, argv); 1677 } 1678 1679 free_sec_add(ecp); 1680 free_sec_act(ecp); 1681 free(ecp); 1682 1683 exit(EXIT_SUCCESS); 1684 } 1685