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 3216 2015-05-23 21:16:36Z kaiwang27 $"); 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 {"arm", ELFOSABI_ARM}, 213 {"standalone", ELFOSABI_STANDALONE}, 214 {NULL, 0} 215 }; 216 217 static int copy_from_tempfile(const char *src, const char *dst, 218 int infd, int *outfd, int in_place); 219 static void create_file(struct elfcopy *ecp, const char *src, 220 const char *dst); 221 static void elfcopy_main(struct elfcopy *ecp, int argc, char **argv); 222 static void elfcopy_usage(void); 223 static void mcs_main(struct elfcopy *ecp, int argc, char **argv); 224 static void mcs_usage(void); 225 static void parse_sec_address_op(struct elfcopy *ecp, int optnum, 226 const char *optname, char *s); 227 static void parse_sec_flags(struct sec_action *sac, char *s); 228 static void parse_symlist_file(struct elfcopy *ecp, const char *fn, 229 unsigned int op); 230 static void print_version(void); 231 static void set_input_target(struct elfcopy *ecp, const char *target_name); 232 static void set_osabi(struct elfcopy *ecp, const char *abi); 233 static void set_output_target(struct elfcopy *ecp, const char *target_name); 234 static void strip_main(struct elfcopy *ecp, int argc, char **argv); 235 static void strip_usage(void); 236 237 /* 238 * An ELF object usually has a sturcture described by the 239 * diagram below. 240 * _____________ 241 * | | 242 * | NULL | <- always a SHT_NULL section 243 * |_____________| 244 * | | 245 * | .interp | 246 * |_____________| 247 * | | 248 * | ... | 249 * |_____________| 250 * | | 251 * | .text | 252 * |_____________| 253 * | | 254 * | ... | 255 * |_____________| 256 * | | 257 * | .comment | <- above(include) this: normal sections 258 * |_____________| 259 * | | 260 * | add sections| <- unloadable sections added by --add-section 261 * |_____________| 262 * | | 263 * | .shstrtab | <- section name string table 264 * |_____________| 265 * | | 266 * | shdrs | <- section header table 267 * |_____________| 268 * | | 269 * | .symtab | <- symbol table, if any 270 * |_____________| 271 * | | 272 * | .strtab | <- symbol name string table, if any 273 * |_____________| 274 * | | 275 * | .rel.text | <- relocation info for .o files. 276 * |_____________| 277 */ 278 void 279 create_elf(struct elfcopy *ecp) 280 { 281 struct section *shtab; 282 GElf_Ehdr ieh; 283 GElf_Ehdr oeh; 284 size_t ishnum; 285 286 ecp->flags |= SYMTAB_INTACT; 287 288 /* Create EHDR. */ 289 if (gelf_getehdr(ecp->ein, &ieh) == NULL) 290 errx(EXIT_FAILURE, "gelf_getehdr() failed: %s", 291 elf_errmsg(-1)); 292 if ((ecp->iec = gelf_getclass(ecp->ein)) == ELFCLASSNONE) 293 errx(EXIT_FAILURE, "getclass() failed: %s", 294 elf_errmsg(-1)); 295 296 if (ecp->oec == ELFCLASSNONE) 297 ecp->oec = ecp->iec; 298 if (ecp->oed == ELFDATANONE) 299 ecp->oed = ieh.e_ident[EI_DATA]; 300 301 if (gelf_newehdr(ecp->eout, ecp->oec) == NULL) 302 errx(EXIT_FAILURE, "gelf_newehdr failed: %s", 303 elf_errmsg(-1)); 304 if (gelf_getehdr(ecp->eout, &oeh) == NULL) 305 errx(EXIT_FAILURE, "gelf_getehdr() failed: %s", 306 elf_errmsg(-1)); 307 308 memcpy(oeh.e_ident, ieh.e_ident, sizeof(ieh.e_ident)); 309 oeh.e_ident[EI_CLASS] = ecp->oec; 310 oeh.e_ident[EI_DATA] = ecp->oed; 311 if (ecp->abi != -1) 312 oeh.e_ident[EI_OSABI] = ecp->abi; 313 oeh.e_flags = ieh.e_flags; 314 oeh.e_machine = ieh.e_machine; 315 oeh.e_type = ieh.e_type; 316 oeh.e_entry = ieh.e_entry; 317 oeh.e_version = ieh.e_version; 318 319 if (ieh.e_type == ET_EXEC) 320 ecp->flags |= EXECUTABLE; 321 else if (ieh.e_type == ET_DYN) 322 ecp->flags |= DYNAMIC; 323 else if (ieh.e_type == ET_REL) 324 ecp->flags |= RELOCATABLE; 325 else 326 errx(EXIT_FAILURE, "unsupported e_type"); 327 328 if (!elf_getshnum(ecp->ein, &ishnum)) 329 errx(EXIT_FAILURE, "elf_getshnum failed: %s", 330 elf_errmsg(-1)); 331 if (ishnum > 0 && (ecp->secndx = calloc(ishnum, 332 sizeof(*ecp->secndx))) == NULL) 333 err(EXIT_FAILURE, "calloc failed"); 334 335 /* Read input object program header. */ 336 setup_phdr(ecp); 337 338 /* 339 * Scan of input sections: we iterate through sections from input 340 * object, skip sections need to be stripped, allot Elf_Scn and 341 * create internal section structure for sections we want. 342 * (i.e., determine output sections) 343 */ 344 create_scn(ecp); 345 346 /* Apply section address changes, if any. */ 347 adjust_addr(ecp); 348 349 /* 350 * Determine if the symbol table needs to be changed based on 351 * command line options. 352 */ 353 if (ecp->strip == STRIP_DEBUG || 354 ecp->strip == STRIP_UNNEEDED || 355 ecp->flags & WEAKEN_ALL || 356 ecp->flags & LOCALIZE_HIDDEN || 357 ecp->flags & DISCARD_LOCAL || 358 ecp->flags & DISCARD_LLABEL || 359 ecp->prefix_sym != NULL || 360 !STAILQ_EMPTY(&ecp->v_symop)) 361 ecp->flags &= ~SYMTAB_INTACT; 362 363 /* 364 * Create symbol table. Symbols are filtered or stripped according to 365 * command line args specified by user, and later updated for the new 366 * layout of sections in the output object. 367 */ 368 if ((ecp->flags & SYMTAB_EXIST) != 0) 369 create_symtab(ecp); 370 371 /* 372 * First processing of output sections: at this stage we copy the 373 * content of each section from input to output object. Section 374 * content will be modified and printed (mcs) if need. Also content of 375 * relocation section probably will be filtered and updated according 376 * to symbol table changes. 377 */ 378 copy_content(ecp); 379 380 /* 381 * Write the underlying ehdr. Note that it should be called 382 * before elf_setshstrndx() since it will overwrite e->e_shstrndx. 383 */ 384 if (gelf_update_ehdr(ecp->eout, &oeh) == 0) 385 errx(EXIT_FAILURE, "gelf_update_ehdr() failed: %s", 386 elf_errmsg(-1)); 387 388 /* Generate section name string table (.shstrtab). */ 389 set_shstrtab(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 internal section list. */ 487 if (!TAILQ_EMPTY(&ecp->v_sec)) { 488 TAILQ_FOREACH_SAFE(sec, &ecp->v_sec, sec_list, sec_temp) { 489 TAILQ_REMOVE(&ecp->v_sec, sec, sec_list); 490 if (sec->buf != NULL) 491 free(sec->buf); 492 if (sec->newname != NULL) 493 free(sec->newname); 494 if (sec->pad != NULL) 495 free(sec->pad); 496 free(sec); 497 } 498 } 499 500 if (ecp->secndx != NULL) { 501 free(ecp->secndx); 502 ecp->secndx = NULL; 503 } 504 } 505 506 /* Create a temporary file. */ 507 void 508 create_tempfile(char **fn, int *fd) 509 { 510 const char *tmpdir; 511 char *cp, *tmpf; 512 size_t tlen, plen; 513 514 #define _TEMPFILE "ecp.XXXXXXXX" 515 #define _TEMPFILEPATH "/tmp/ecp.XXXXXXXX" 516 517 if (fn == NULL || fd == NULL) 518 return; 519 /* Repect TMPDIR environment variable. */ 520 tmpdir = getenv("TMPDIR"); 521 if (tmpdir != NULL && *tmpdir != '\0') { 522 tlen = strlen(tmpdir); 523 plen = strlen(_TEMPFILE); 524 tmpf = malloc(tlen + plen + 2); 525 if (tmpf == NULL) 526 err(EXIT_FAILURE, "malloc failed"); 527 strncpy(tmpf, tmpdir, tlen); 528 cp = &tmpf[tlen - 1]; 529 if (*cp++ != '/') 530 *cp++ = '/'; 531 strncpy(cp, _TEMPFILE, plen); 532 cp[plen] = '\0'; 533 } else { 534 tmpf = strdup(_TEMPFILEPATH); 535 if (tmpf == NULL) 536 err(EXIT_FAILURE, "strdup failed"); 537 } 538 if ((*fd = mkstemp(tmpf)) == -1) 539 err(EXIT_FAILURE, "mkstemp %s failed", tmpf); 540 if (fchmod(*fd, 0644) == -1) 541 err(EXIT_FAILURE, "fchmod %s failed", tmpf); 542 *fn = tmpf; 543 544 #undef _TEMPFILE 545 #undef _TEMPFILEPATH 546 } 547 548 /* 549 * Copy temporary file with path src and file descriptor infd to path dst. 550 * If in_place is set act as if editing the file in place, avoiding rename() 551 * to preserve hard and symbolic links. Output file remains open, with file 552 * descriptor returned in outfd. 553 */ 554 static int 555 copy_from_tempfile(const char *src, const char *dst, int infd, int *outfd, 556 int in_place) 557 { 558 int tmpfd; 559 560 /* 561 * First, check if we can use rename(). 562 */ 563 if (in_place == 0) { 564 if (rename(src, dst) >= 0) { 565 *outfd = infd; 566 return (0); 567 } else if (errno != EXDEV) 568 return (-1); 569 570 /* 571 * If the rename() failed due to 'src' and 'dst' residing in 572 * two different file systems, invoke a helper function in 573 * libelftc to do the copy. 574 */ 575 576 if (unlink(dst) < 0) 577 return (-1); 578 } 579 580 if ((tmpfd = open(dst, O_CREAT | O_TRUNC | O_WRONLY, 0755)) < 0) 581 return (-1); 582 583 if (elftc_copyfile(infd, tmpfd) < 0) 584 return (-1); 585 586 /* 587 * Remove the temporary file from the file system 588 * namespace, and close its file descriptor. 589 */ 590 if (unlink(src) < 0) 591 return (-1); 592 593 (void) close(infd); 594 595 /* 596 * Return the file descriptor for the destination. 597 */ 598 *outfd = tmpfd; 599 600 return (0); 601 } 602 603 static void 604 create_file(struct elfcopy *ecp, const char *src, const char *dst) 605 { 606 struct stat sb; 607 char *tempfile, *elftemp; 608 int efd, ifd, ofd, ofd0, tfd; 609 int in_place; 610 611 tempfile = NULL; 612 613 if (src == NULL) 614 errx(EXIT_FAILURE, "internal: src == NULL"); 615 if ((ifd = open(src, O_RDONLY)) == -1) 616 err(EXIT_FAILURE, "open %s failed", src); 617 618 if (fstat(ifd, &sb) == -1) 619 err(EXIT_FAILURE, "fstat %s failed", src); 620 621 if (dst == NULL) 622 create_tempfile(&tempfile, &ofd); 623 else 624 if ((ofd = open(dst, O_RDWR|O_CREAT, 0755)) == -1) 625 err(EXIT_FAILURE, "open %s failed", dst); 626 627 #ifndef LIBELF_AR 628 /* Detect and process ar(1) archive using libarchive. */ 629 if (ac_detect_ar(ifd)) { 630 ac_create_ar(ecp, ifd, ofd); 631 goto copy_done; 632 } 633 #endif 634 635 if (lseek(ifd, 0, SEEK_SET) < 0) 636 err(EXIT_FAILURE, "lseek failed"); 637 638 /* 639 * If input object is not ELF file, convert it to an intermediate 640 * ELF object before processing. 641 */ 642 if (ecp->itf != ETF_ELF) { 643 create_tempfile(&elftemp, &efd); 644 if ((ecp->eout = elf_begin(efd, ELF_C_WRITE, NULL)) == NULL) 645 errx(EXIT_FAILURE, "elf_begin() failed: %s", 646 elf_errmsg(-1)); 647 elf_flagelf(ecp->eout, ELF_C_SET, ELF_F_LAYOUT); 648 if (ecp->itf == ETF_BINARY) 649 create_elf_from_binary(ecp, ifd, src); 650 else if (ecp->itf == ETF_IHEX) 651 create_elf_from_ihex(ecp, ifd); 652 else if (ecp->itf == ETF_SREC) 653 create_elf_from_srec(ecp, ifd); 654 else 655 errx(EXIT_FAILURE, "Internal: invalid target flavour"); 656 elf_end(ecp->eout); 657 658 /* Open intermediate ELF object as new input object. */ 659 close(ifd); 660 if ((ifd = open(elftemp, O_RDONLY)) == -1) 661 err(EXIT_FAILURE, "open %s failed", src); 662 close(efd); 663 free(elftemp); 664 } 665 666 if ((ecp->ein = elf_begin(ifd, ELF_C_READ, NULL)) == NULL) 667 errx(EXIT_FAILURE, "elf_begin() failed: %s", 668 elf_errmsg(-1)); 669 670 switch (elf_kind(ecp->ein)) { 671 case ELF_K_NONE: 672 errx(EXIT_FAILURE, "file format not recognized"); 673 case ELF_K_ELF: 674 if ((ecp->eout = elf_begin(ofd, ELF_C_WRITE, NULL)) == NULL) 675 errx(EXIT_FAILURE, "elf_begin() failed: %s", 676 elf_errmsg(-1)); 677 678 /* elfcopy(1) manage ELF layout by itself. */ 679 elf_flagelf(ecp->eout, ELF_C_SET, ELF_F_LAYOUT); 680 681 /* 682 * Create output ELF object. 683 */ 684 create_elf(ecp); 685 elf_end(ecp->eout); 686 687 /* 688 * Convert the output ELF object to binary/srec/ihex if need. 689 */ 690 if (ecp->otf != ETF_ELF) { 691 /* 692 * Create (another) tempfile for binary/srec/ihex 693 * output object. 694 */ 695 if (tempfile != NULL) { 696 if (unlink(tempfile) < 0) 697 err(EXIT_FAILURE, "unlink %s failed", 698 tempfile); 699 free(tempfile); 700 } 701 create_tempfile(&tempfile, &ofd0); 702 703 704 /* 705 * Rewind the file descriptor being processed. 706 */ 707 if (lseek(ofd, 0, SEEK_SET) < 0) 708 err(EXIT_FAILURE, 709 "lseek failed for the output object"); 710 711 /* 712 * Call flavour-specific conversion routine. 713 */ 714 switch (ecp->otf) { 715 case ETF_BINARY: 716 create_binary(ofd, ofd0); 717 break; 718 case ETF_IHEX: 719 create_ihex(ofd, ofd0); 720 break; 721 case ETF_SREC: 722 create_srec(ecp, ofd, ofd0, 723 dst != NULL ? dst : src); 724 break; 725 default: 726 errx(EXIT_FAILURE, "Internal: unsupported" 727 " output flavour %d", ecp->oec); 728 } 729 730 close(ofd); 731 ofd = ofd0; 732 } 733 734 break; 735 736 case ELF_K_AR: 737 /* XXX: Not yet supported. */ 738 break; 739 default: 740 errx(EXIT_FAILURE, "file format not supported"); 741 } 742 743 elf_end(ecp->ein); 744 745 #ifndef LIBELF_AR 746 copy_done: 747 #endif 748 749 if (tempfile != NULL) { 750 in_place = 0; 751 if (dst == NULL) { 752 dst = src; 753 if (lstat(dst, &sb) != -1 && 754 (sb.st_nlink > 1 || S_ISLNK(sb.st_mode))) 755 in_place = 1; 756 } 757 758 if (copy_from_tempfile(tempfile, dst, ofd, &tfd, in_place) < 0) 759 err(EXIT_FAILURE, "creation of %s failed", dst); 760 761 free(tempfile); 762 tempfile = NULL; 763 764 ofd = tfd; 765 } 766 767 if (strcmp(dst, "/dev/null") && fchmod(ofd, sb.st_mode) == -1) 768 err(EXIT_FAILURE, "fchmod %s failed", dst); 769 770 if ((ecp->flags & PRESERVE_DATE) && 771 elftc_set_timestamps(dst, &sb) < 0) 772 err(EXIT_FAILURE, "setting timestamps failed"); 773 774 close(ifd); 775 close(ofd); 776 } 777 778 static void 779 elfcopy_main(struct elfcopy *ecp, int argc, char **argv) 780 { 781 struct sec_action *sac; 782 const char *infile, *outfile; 783 char *fn, *s; 784 int opt; 785 786 while ((opt = getopt_long(argc, argv, "dB:gG:I:j:K:L:N:O:pR:s:SwW:xXV", 787 elfcopy_longopts, NULL)) != -1) { 788 switch(opt) { 789 case 'B': 790 /* ignored */ 791 break; 792 case 'R': 793 sac = lookup_sec_act(ecp, optarg, 1); 794 if (sac->copy != 0) 795 errx(EXIT_FAILURE, 796 "both copy and remove specified"); 797 sac->remove = 1; 798 ecp->flags |= SEC_REMOVE; 799 break; 800 case 'S': 801 ecp->strip = STRIP_ALL; 802 break; 803 case 'g': 804 ecp->strip = STRIP_DEBUG; 805 break; 806 case 'G': 807 ecp->flags |= KEEP_GLOBAL; 808 add_to_symop_list(ecp, optarg, NULL, SYMOP_KEEPG); 809 break; 810 case 'I': 811 case 's': 812 set_input_target(ecp, optarg); 813 break; 814 case 'j': 815 sac = lookup_sec_act(ecp, optarg, 1); 816 if (sac->remove != 0) 817 errx(EXIT_FAILURE, 818 "both copy and remove specified"); 819 sac->copy = 1; 820 ecp->flags |= SEC_COPY; 821 break; 822 case 'K': 823 add_to_symop_list(ecp, optarg, NULL, SYMOP_KEEP); 824 break; 825 case 'L': 826 add_to_symop_list(ecp, optarg, NULL, SYMOP_LOCALIZE); 827 break; 828 case 'N': 829 add_to_symop_list(ecp, optarg, NULL, SYMOP_STRIP); 830 break; 831 case 'O': 832 set_output_target(ecp, optarg); 833 break; 834 case 'p': 835 ecp->flags |= PRESERVE_DATE; 836 break; 837 case 'V': 838 print_version(); 839 break; 840 case 'w': 841 ecp->flags |= WILDCARD; 842 break; 843 case 'W': 844 add_to_symop_list(ecp, optarg, NULL, SYMOP_WEAKEN); 845 break; 846 case 'x': 847 ecp->flags |= DISCARD_LOCAL; 848 break; 849 case 'X': 850 ecp->flags |= DISCARD_LLABEL; 851 break; 852 case ECP_ADD_GNU_DEBUGLINK: 853 ecp->debuglink = optarg; 854 break; 855 case ECP_ADD_SECTION: 856 add_section(ecp, optarg); 857 break; 858 case ECP_CHANGE_ADDR: 859 ecp->change_addr = (int64_t) strtoll(optarg, NULL, 0); 860 break; 861 case ECP_CHANGE_SEC_ADDR: 862 parse_sec_address_op(ecp, opt, "--change-section-addr", 863 optarg); 864 break; 865 case ECP_CHANGE_SEC_LMA: 866 parse_sec_address_op(ecp, opt, "--change-section-lma", 867 optarg); 868 break; 869 case ECP_CHANGE_SEC_VMA: 870 parse_sec_address_op(ecp, opt, "--change-section-vma", 871 optarg); 872 break; 873 case ECP_CHANGE_START: 874 ecp->change_start = (int64_t) strtoll(optarg, NULL, 0); 875 break; 876 case ECP_CHANGE_WARN: 877 /* default */ 878 break; 879 case ECP_GAP_FILL: 880 ecp->fill = (uint8_t) strtoul(optarg, NULL, 0); 881 ecp->flags |= GAP_FILL; 882 break; 883 case ECP_GLOBALIZE_SYMBOL: 884 add_to_symop_list(ecp, optarg, NULL, SYMOP_GLOBALIZE); 885 break; 886 case ECP_GLOBALIZE_SYMBOLS: 887 parse_symlist_file(ecp, optarg, SYMOP_GLOBALIZE); 888 break; 889 case ECP_KEEP_SYMBOLS: 890 parse_symlist_file(ecp, optarg, SYMOP_KEEP); 891 break; 892 case ECP_KEEP_GLOBAL_SYMBOLS: 893 parse_symlist_file(ecp, optarg, SYMOP_KEEPG); 894 break; 895 case ECP_LOCALIZE_HIDDEN: 896 ecp->flags |= LOCALIZE_HIDDEN; 897 break; 898 case ECP_LOCALIZE_SYMBOLS: 899 parse_symlist_file(ecp, optarg, SYMOP_LOCALIZE); 900 break; 901 case ECP_NO_CHANGE_WARN: 902 ecp->flags |= NO_CHANGE_WARN; 903 break; 904 case ECP_ONLY_DEBUG: 905 ecp->strip = STRIP_NONDEBUG; 906 break; 907 case ECP_ONLY_DWO: 908 ecp->strip = STRIP_NONDWO; 909 break; 910 case ECP_PAD_TO: 911 ecp->pad_to = (uint64_t) strtoull(optarg, NULL, 0); 912 break; 913 case ECP_PREFIX_ALLOC: 914 ecp->prefix_alloc = optarg; 915 break; 916 case ECP_PREFIX_SEC: 917 ecp->prefix_sec = optarg; 918 break; 919 case ECP_PREFIX_SYM: 920 ecp->prefix_sym = optarg; 921 break; 922 case ECP_REDEF_SYMBOL: 923 if ((s = strchr(optarg, '=')) == NULL) 924 errx(EXIT_FAILURE, 925 "illegal format for --redefine-sym"); 926 *s++ = '\0'; 927 add_to_symop_list(ecp, optarg, s, SYMOP_REDEF); 928 break; 929 case ECP_REDEF_SYMBOLS: 930 parse_symlist_file(ecp, optarg, SYMOP_REDEF); 931 break; 932 case ECP_RENAME_SECTION: 933 if ((fn = strchr(optarg, '=')) == NULL) 934 errx(EXIT_FAILURE, 935 "illegal format for --rename-section"); 936 *fn++ = '\0'; 937 938 /* Check for optional flags. */ 939 if ((s = strchr(fn, ',')) != NULL) 940 *s++ = '\0'; 941 942 sac = lookup_sec_act(ecp, optarg, 1); 943 sac->rename = 1; 944 sac->newname = fn; 945 if (s != NULL) 946 parse_sec_flags(sac, s); 947 break; 948 case ECP_SET_OSABI: 949 set_osabi(ecp, optarg); 950 break; 951 case ECP_SET_SEC_FLAGS: 952 if ((s = strchr(optarg, '=')) == NULL) 953 errx(EXIT_FAILURE, 954 "illegal format for --set-section-flags"); 955 *s++ = '\0'; 956 sac = lookup_sec_act(ecp, optarg, 1); 957 parse_sec_flags(sac, s); 958 break; 959 case ECP_SET_START: 960 ecp->flags |= SET_START; 961 ecp->set_start = (uint64_t) strtoull(optarg, NULL, 0); 962 break; 963 case ECP_SREC_FORCE_S3: 964 ecp->flags |= SREC_FORCE_S3; 965 break; 966 case ECP_SREC_LEN: 967 ecp->flags |= SREC_FORCE_LEN; 968 ecp->srec_len = strtoul(optarg, NULL, 0); 969 break; 970 case ECP_STRIP_DWO: 971 ecp->strip = STRIP_DWO; 972 break; 973 case ECP_STRIP_SYMBOLS: 974 parse_symlist_file(ecp, optarg, SYMOP_STRIP); 975 break; 976 case ECP_STRIP_UNNEEDED: 977 ecp->strip = STRIP_UNNEEDED; 978 break; 979 case ECP_WEAKEN_ALL: 980 ecp->flags |= WEAKEN_ALL; 981 break; 982 case ECP_WEAKEN_SYMBOLS: 983 parse_symlist_file(ecp, optarg, SYMOP_WEAKEN); 984 break; 985 default: 986 elfcopy_usage(); 987 } 988 } 989 990 if (optind == argc || optind + 2 < argc) 991 elfcopy_usage(); 992 993 infile = argv[optind]; 994 outfile = NULL; 995 if (optind + 1 < argc) 996 outfile = argv[optind + 1]; 997 998 create_file(ecp, infile, outfile); 999 } 1000 1001 static void 1002 mcs_main(struct elfcopy *ecp, int argc, char **argv) 1003 { 1004 struct sec_action *sac; 1005 const char *string; 1006 int append, delete, compress, name, print; 1007 int opt, i; 1008 1009 append = delete = compress = name = print = 0; 1010 string = NULL; 1011 while ((opt = getopt_long(argc, argv, "a:cdhn:pV", mcs_longopts, 1012 NULL)) != -1) { 1013 switch(opt) { 1014 case 'a': 1015 append = 1; 1016 string = optarg; /* XXX multiple -a not supported */ 1017 break; 1018 case 'c': 1019 compress = 1; 1020 break; 1021 case 'd': 1022 delete = 1; 1023 break; 1024 case 'n': 1025 name = 1; 1026 (void)lookup_sec_act(ecp, optarg, 1); 1027 break; 1028 case 'p': 1029 print = 1; 1030 break; 1031 case 'V': 1032 print_version(); 1033 break; 1034 case 'h': 1035 default: 1036 mcs_usage(); 1037 } 1038 } 1039 1040 if (optind == argc) 1041 mcs_usage(); 1042 1043 /* Must specify one operation at least. */ 1044 if (!append && !compress && !delete && !print) 1045 mcs_usage(); 1046 1047 /* 1048 * If we are going to delete, ignore other operations. This is 1049 * different from the Solaris implementation, which can print 1050 * and delete a section at the same time, for example. Also, this 1051 * implementation do not respect the order between operations that 1052 * user specified, i.e., "mcs -pc a.out" equals to "mcs -cp a.out". 1053 */ 1054 if (delete) { 1055 append = compress = print = 0; 1056 ecp->flags |= SEC_REMOVE; 1057 } 1058 if (append) 1059 ecp->flags |= SEC_APPEND; 1060 if (compress) 1061 ecp->flags |= SEC_COMPRESS; 1062 if (print) 1063 ecp->flags |= SEC_PRINT; 1064 1065 /* .comment is the default section to operate on. */ 1066 if (!name) 1067 (void)lookup_sec_act(ecp, ".comment", 1); 1068 1069 STAILQ_FOREACH(sac, &ecp->v_sac, sac_list) { 1070 sac->append = append; 1071 sac->compress = compress; 1072 sac->print = print; 1073 sac->remove = delete; 1074 sac->string = string; 1075 } 1076 1077 for (i = optind; i < argc; i++) { 1078 /* If only -p is specified, output to /dev/null */ 1079 if (print && !append && !compress && !delete) 1080 create_file(ecp, argv[i], "/dev/null"); 1081 else 1082 create_file(ecp, argv[i], NULL); 1083 } 1084 } 1085 1086 static void 1087 strip_main(struct elfcopy *ecp, int argc, char **argv) 1088 { 1089 struct sec_action *sac; 1090 const char *outfile; 1091 int opt; 1092 int i; 1093 1094 outfile = NULL; 1095 while ((opt = getopt_long(argc, argv, "hI:K:N:o:O:pR:sSdgVxXw", 1096 strip_longopts, NULL)) != -1) { 1097 switch(opt) { 1098 case 'R': 1099 sac = lookup_sec_act(ecp, optarg, 1); 1100 sac->remove = 1; 1101 ecp->flags |= SEC_REMOVE; 1102 break; 1103 case 's': 1104 ecp->strip = STRIP_ALL; 1105 break; 1106 case 'S': 1107 case 'g': 1108 case 'd': 1109 ecp->strip = STRIP_DEBUG; 1110 break; 1111 case 'I': 1112 /* ignored */ 1113 break; 1114 case 'K': 1115 add_to_symop_list(ecp, optarg, NULL, SYMOP_KEEP); 1116 break; 1117 case 'N': 1118 add_to_symop_list(ecp, optarg, NULL, SYMOP_STRIP); 1119 break; 1120 case 'o': 1121 outfile = optarg; 1122 break; 1123 case 'O': 1124 set_output_target(ecp, optarg); 1125 break; 1126 case 'p': 1127 ecp->flags |= PRESERVE_DATE; 1128 break; 1129 case 'V': 1130 print_version(); 1131 break; 1132 case 'w': 1133 ecp->flags |= WILDCARD; 1134 break; 1135 case 'x': 1136 ecp->flags |= DISCARD_LOCAL; 1137 break; 1138 case 'X': 1139 ecp->flags |= DISCARD_LLABEL; 1140 break; 1141 case ECP_ONLY_DEBUG: 1142 ecp->strip = STRIP_NONDEBUG; 1143 break; 1144 case ECP_STRIP_UNNEEDED: 1145 ecp->strip = STRIP_UNNEEDED; 1146 break; 1147 case 'h': 1148 default: 1149 strip_usage(); 1150 } 1151 } 1152 1153 if (ecp->strip == 0 && 1154 ((ecp->flags & DISCARD_LOCAL) == 0) && 1155 ((ecp->flags & DISCARD_LLABEL) == 0) && 1156 lookup_symop_list(ecp, NULL, SYMOP_STRIP) == NULL) 1157 ecp->strip = STRIP_ALL; 1158 if (optind == argc) 1159 strip_usage(); 1160 1161 for (i = optind; i < argc; i++) 1162 create_file(ecp, argv[i], outfile); 1163 } 1164 1165 static void 1166 parse_sec_flags(struct sec_action *sac, char *s) 1167 { 1168 const char *flag; 1169 int found, i; 1170 1171 for (flag = strtok(s, ","); flag; flag = strtok(NULL, ",")) { 1172 found = 0; 1173 for (i = 0; sec_flags[i].name != NULL; i++) 1174 if (strcasecmp(sec_flags[i].name, flag) == 0) { 1175 sac->flags |= sec_flags[i].value; 1176 found = 1; 1177 break; 1178 } 1179 if (!found) 1180 errx(EXIT_FAILURE, "unrecognized section flag %s", 1181 flag); 1182 } 1183 } 1184 1185 static void 1186 parse_sec_address_op(struct elfcopy *ecp, int optnum, const char *optname, 1187 char *s) 1188 { 1189 struct sec_action *sac; 1190 const char *name; 1191 char *v; 1192 char op; 1193 1194 name = v = s; 1195 do { 1196 v++; 1197 } while (*v != '\0' && *v != '=' && *v != '+' && *v != '-'); 1198 if (*v == '\0' || *(v + 1) == '\0') 1199 errx(EXIT_FAILURE, "invalid format for %s", optname); 1200 op = *v; 1201 *v++ = '\0'; 1202 sac = lookup_sec_act(ecp, name, 1); 1203 switch (op) { 1204 case '=': 1205 if (optnum == ECP_CHANGE_SEC_LMA || 1206 optnum == ECP_CHANGE_SEC_ADDR) { 1207 sac->setlma = 1; 1208 sac->lma = (uint64_t) strtoull(v, NULL, 0); 1209 } 1210 if (optnum == ECP_CHANGE_SEC_VMA || 1211 optnum == ECP_CHANGE_SEC_ADDR) { 1212 sac->setvma = 1; 1213 sac->vma = (uint64_t) strtoull(v, NULL, 0); 1214 } 1215 break; 1216 case '+': 1217 if (optnum == ECP_CHANGE_SEC_LMA || 1218 optnum == ECP_CHANGE_SEC_ADDR) 1219 sac->lma_adjust = (int64_t) strtoll(v, NULL, 0); 1220 if (optnum == ECP_CHANGE_SEC_VMA || 1221 optnum == ECP_CHANGE_SEC_ADDR) 1222 sac->vma_adjust = (int64_t) strtoll(v, NULL, 0); 1223 break; 1224 case '-': 1225 if (optnum == ECP_CHANGE_SEC_LMA || 1226 optnum == ECP_CHANGE_SEC_ADDR) 1227 sac->lma_adjust = (int64_t) -strtoll(v, NULL, 0); 1228 if (optnum == ECP_CHANGE_SEC_VMA || 1229 optnum == ECP_CHANGE_SEC_ADDR) 1230 sac->vma_adjust = (int64_t) -strtoll(v, NULL, 0); 1231 break; 1232 default: 1233 break; 1234 } 1235 } 1236 1237 static void 1238 parse_symlist_file(struct elfcopy *ecp, const char *fn, unsigned int op) 1239 { 1240 struct symfile *sf; 1241 struct stat sb; 1242 FILE *fp; 1243 char *data, *p, *line, *end, *e, *n; 1244 1245 if (stat(fn, &sb) == -1) 1246 err(EXIT_FAILURE, "stat %s failed", fn); 1247 1248 /* Check if we already read and processed this file. */ 1249 STAILQ_FOREACH(sf, &ecp->v_symfile, symfile_list) { 1250 if (sf->dev == sb.st_dev && sf->ino == sb.st_ino) 1251 goto process_symfile; 1252 } 1253 1254 if ((fp = fopen(fn, "r")) == NULL) 1255 err(EXIT_FAILURE, "can not open %s", fn); 1256 if ((data = malloc(sb.st_size + 1)) == NULL) 1257 err(EXIT_FAILURE, "malloc failed"); 1258 if (fread(data, 1, sb.st_size, fp) == 0 || ferror(fp)) 1259 err(EXIT_FAILURE, "fread failed"); 1260 fclose(fp); 1261 data[sb.st_size] = '\0'; 1262 1263 if ((sf = calloc(1, sizeof(*sf))) == NULL) 1264 err(EXIT_FAILURE, "malloc failed"); 1265 sf->dev = sb.st_dev; 1266 sf->ino = sb.st_ino; 1267 sf->size = sb.st_size + 1; 1268 sf->data = data; 1269 1270 process_symfile: 1271 1272 /* 1273 * Basically what we do here is to convert EOL to '\0', and remove 1274 * leading and trailing whitespaces for each line. 1275 */ 1276 1277 end = sf->data + sf->size; 1278 line = NULL; 1279 for(p = sf->data; p < end; p++) { 1280 if ((*p == '\t' || *p == ' ') && line == NULL) 1281 continue; 1282 if (*p == '\r' || *p == '\n' || *p == '\0') { 1283 *p = '\0'; 1284 if (line == NULL) 1285 continue; 1286 1287 /* Skip comment. */ 1288 if (*line == '#') { 1289 line = NULL; 1290 continue; 1291 } 1292 1293 e = p - 1; 1294 while(e != line && (*e == '\t' || *e == ' ')) 1295 *e-- = '\0'; 1296 if (op != SYMOP_REDEF) 1297 add_to_symop_list(ecp, line, NULL, op); 1298 else { 1299 if (strlen(line) < 3) 1300 errx(EXIT_FAILURE, 1301 "illegal format for" 1302 " --redefine-sym"); 1303 for(n = line + 1; n < e; n++) { 1304 if (*n == ' ' || *n == '\t') { 1305 while(*n == ' ' || *n == '\t') 1306 *n++ = '\0'; 1307 break; 1308 } 1309 } 1310 if (n >= e) 1311 errx(EXIT_FAILURE, 1312 "illegal format for" 1313 " --redefine-sym"); 1314 add_to_symop_list(ecp, line, n, op); 1315 } 1316 line = NULL; 1317 continue; 1318 } 1319 1320 if (line == NULL) 1321 line = p; 1322 } 1323 } 1324 1325 static void 1326 set_input_target(struct elfcopy *ecp, const char *target_name) 1327 { 1328 Elftc_Bfd_Target *tgt; 1329 1330 if ((tgt = elftc_bfd_find_target(target_name)) == NULL) 1331 errx(EXIT_FAILURE, "%s: invalid target name", target_name); 1332 ecp->itf = elftc_bfd_target_flavor(tgt); 1333 } 1334 1335 static void 1336 set_output_target(struct elfcopy *ecp, const char *target_name) 1337 { 1338 Elftc_Bfd_Target *tgt; 1339 1340 if ((tgt = elftc_bfd_find_target(target_name)) == NULL) 1341 errx(EXIT_FAILURE, "%s: invalid target name", target_name); 1342 ecp->otf = elftc_bfd_target_flavor(tgt); 1343 if (ecp->otf == ETF_ELF) { 1344 ecp->oec = elftc_bfd_target_class(tgt); 1345 ecp->oed = elftc_bfd_target_byteorder(tgt); 1346 ecp->oem = elftc_bfd_target_machine(tgt); 1347 } 1348 ecp->otgt = target_name; 1349 } 1350 1351 static void 1352 set_osabi(struct elfcopy *ecp, const char *abi) 1353 { 1354 int i, found; 1355 1356 found = 0; 1357 for (i = 0; osabis[i].name != NULL; i++) 1358 if (strcasecmp(osabis[i].name, abi) == 0) { 1359 ecp->abi = osabis[i].abi; 1360 found = 1; 1361 break; 1362 } 1363 if (!found) 1364 errx(EXIT_FAILURE, "unrecognized OSABI %s", abi); 1365 } 1366 1367 #define ELFCOPY_USAGE_MESSAGE "\ 1368 Usage: %s [options] infile [outfile]\n\ 1369 Transform an ELF object.\n\n\ 1370 Options:\n\ 1371 -d | -g | --strip-debug Remove debugging information from the output.\n\ 1372 -j SECTION | --only-section=SECTION\n\ 1373 Copy only the named section to the output.\n\ 1374 -p | --preserve-dates Preserve access and modification times.\n\ 1375 -w | --wildcard Use shell-style patterns to name symbols.\n\ 1376 -x | --discard-all Do not copy non-globals to the output.\n\ 1377 -I FORMAT | --input-target=FORMAT\n\ 1378 (Accepted but ignored).\n\ 1379 -K SYM | --keep-symbol=SYM Copy symbol SYM to the output.\n\ 1380 -L SYM | --localize-symbol=SYM\n\ 1381 Make symbol SYM local to the output file.\n\ 1382 -N SYM | --strip-symbol=SYM Do not copy symbol SYM to the output.\n\ 1383 -R NAME | --remove-section=NAME\n\ 1384 Remove the named section.\n\ 1385 -S | --strip-all Remove all symbol and relocation information\n\ 1386 from the output.\n\ 1387 -V | --version Print a version identifier and exit.\n\ 1388 -W SYM | --weaken-symbol=SYM Mark symbol SYM as weak in the output.\n\ 1389 -X | --discard-locals Do not copy compiler generated symbols to\n\ 1390 the output.\n\ 1391 --add-section NAME=FILE Add the contents of FILE to the ELF object as\n\ 1392 a new section named NAME.\n\ 1393 --adjust-section-vma SECTION{=,+,-}VAL | \\\n\ 1394 --change-section-address SECTION{=,+,-}VAL\n\ 1395 Set or adjust the VMA and the LMA of the\n\ 1396 named section by VAL.\n\ 1397 --adjust-start=INCR | --change-start=INCR\n\ 1398 Add INCR to the start address for the ELF\n\ 1399 object.\n\ 1400 --adjust-vma=INCR | --change-addresses=INCR\n\ 1401 Increase the VMA and LMA of all sections by\n\ 1402 INCR.\n\ 1403 --adjust-warning | --change-warnings\n\ 1404 Issue warnings for non-existent sections.\n\ 1405 --change-section-lma SECTION{=,+,-}VAL\n\ 1406 Set or adjust the LMA address of the named\n\ 1407 section by VAL.\n\ 1408 --change-section-vma SECTION{=,+,-}VAL\n\ 1409 Set or adjust the VMA address of the named\n\ 1410 section by VAL.\n\ 1411 --gap-fill=VAL Fill the gaps between sections with bytes\n\ 1412 of value VAL.\n\ 1413 --localize-hidden Make all hidden symbols local to the output\n\ 1414 file.\n\ 1415 --no-adjust-warning| --no-change-warnings\n\ 1416 Do not issue warnings for non-existent\n\ 1417 sections.\n\ 1418 --only-keep-debug Copy only debugging information.\n\ 1419 --output-target=FORMAT Use the specified format for the output.\n\ 1420 --pad-to=ADDRESS Pad the output object upto the given address.\n\ 1421 --prefix-alloc-sections=STRING\n\ 1422 Prefix the section names of all the allocated\n\ 1423 sections with STRING.\n\ 1424 --prefix-sections=STRING Prefix the section names of all the sections\n\ 1425 with STRING.\n\ 1426 --prefix-symbols=STRING Prefix the symbol names of all the symbols\n\ 1427 with STRING.\n\ 1428 --rename-section OLDNAME=NEWNAME[,FLAGS]\n\ 1429 Rename and optionally change section flags.\n\ 1430 --set-section-flags SECTION=FLAGS\n\ 1431 Set section flags for the named section.\n\ 1432 Supported flags are: 'alloc', 'code',\n\ 1433 'contents', 'data', 'debug', 'load',\n\ 1434 'noload', 'readonly', 'rom', and 'shared'.\n\ 1435 --set-start=ADDRESS Set the start address of the ELF object.\n\ 1436 --srec-forceS3 Only generate S3 S-Records.\n\ 1437 --srec-len=LEN Set the maximum length of a S-Record line.\n\ 1438 --strip-unneeded Do not copy relocation information.\n" 1439 1440 static void 1441 elfcopy_usage(void) 1442 { 1443 (void) fprintf(stderr, ELFCOPY_USAGE_MESSAGE, ELFTC_GETPROGNAME()); 1444 exit(EXIT_FAILURE); 1445 } 1446 1447 #define MCS_USAGE_MESSAGE "\ 1448 Usage: %s [options] file...\n\ 1449 Manipulate the comment section in an ELF object.\n\n\ 1450 Options:\n\ 1451 -a STRING Append 'STRING' to the comment section.\n\ 1452 -c Remove duplicate entries from the comment section.\n\ 1453 -d Delete the comment section.\n\ 1454 -h | --help Print a help message and exit.\n\ 1455 -n NAME Operate on the ELF section with name 'NAME'.\n\ 1456 -p Print the contents of the comment section.\n\ 1457 -V | --version Print a version identifier and exit.\n" 1458 1459 static void 1460 mcs_usage(void) 1461 { 1462 (void) fprintf(stderr, MCS_USAGE_MESSAGE, ELFTC_GETPROGNAME()); 1463 exit(EXIT_FAILURE); 1464 } 1465 1466 #define STRIP_USAGE_MESSAGE "\ 1467 Usage: %s [options] file...\n\ 1468 Discard information from ELF objects.\n\n\ 1469 Options:\n\ 1470 -d | -g | -S | --strip-debug Remove debugging symbols.\n\ 1471 -h | --help Print a help message.\n\ 1472 --only-keep-debug Keep debugging information only.\n\ 1473 -p | --preserve-dates Preserve access and modification times.\n\ 1474 -s | --strip-all Remove all symbols.\n\ 1475 --strip-unneeded Remove symbols not needed for relocation\n\ 1476 processing.\n\ 1477 -w | --wildcard Use shell-style patterns to name symbols.\n\ 1478 -x | --discard-all Discard all non-global symbols.\n\ 1479 -I TGT| --input-target=TGT (Accepted, but ignored).\n\ 1480 -K SYM | --keep-symbol=SYM Keep symbol 'SYM' in the output.\n\ 1481 -N SYM | --strip-symbol=SYM Remove symbol 'SYM' from the output.\n\ 1482 -O TGT | --output-target=TGT Set the output file format to 'TGT'.\n\ 1483 -R SEC | --remove-section=SEC Remove the section named 'SEC'.\n\ 1484 -V | --version Print a version identifier and exit.\n\ 1485 -X | --discard-locals Remove compiler-generated local symbols.\n" 1486 1487 static void 1488 strip_usage(void) 1489 { 1490 (void) fprintf(stderr, STRIP_USAGE_MESSAGE, ELFTC_GETPROGNAME()); 1491 exit(EXIT_FAILURE); 1492 } 1493 1494 static void 1495 print_version(void) 1496 { 1497 (void) printf("%s (%s)\n", ELFTC_GETPROGNAME(), elftc_version()); 1498 exit(EXIT_SUCCESS); 1499 } 1500 1501 int 1502 main(int argc, char **argv) 1503 { 1504 struct elfcopy *ecp; 1505 1506 if (elf_version(EV_CURRENT) == EV_NONE) 1507 errx(EXIT_FAILURE, "ELF library initialization failed: %s", 1508 elf_errmsg(-1)); 1509 1510 ecp = calloc(1, sizeof(*ecp)); 1511 if (ecp == NULL) 1512 err(EXIT_FAILURE, "calloc failed"); 1513 memset(ecp, 0, sizeof(*ecp)); 1514 1515 ecp->itf = ecp->otf = ETF_ELF; 1516 ecp->iec = ecp->oec = ELFCLASSNONE; 1517 ecp->oed = ELFDATANONE; 1518 ecp->abi = -1; 1519 /* There is always an empty section. */ 1520 ecp->nos = 1; 1521 ecp->fill = 0; 1522 1523 STAILQ_INIT(&ecp->v_seg); 1524 STAILQ_INIT(&ecp->v_sac); 1525 STAILQ_INIT(&ecp->v_sadd); 1526 STAILQ_INIT(&ecp->v_symop); 1527 STAILQ_INIT(&ecp->v_symfile); 1528 STAILQ_INIT(&ecp->v_arobj); 1529 TAILQ_INIT(&ecp->v_sec); 1530 1531 if ((ecp->progname = ELFTC_GETPROGNAME()) == NULL) 1532 ecp->progname = "elfcopy"; 1533 1534 if (strcmp(ecp->progname, "strip") == 0) 1535 strip_main(ecp, argc, argv); 1536 else if (strcmp(ecp->progname, "mcs") == 0) 1537 mcs_main(ecp, argc, argv); 1538 else 1539 elfcopy_main(ecp, argc, argv); 1540 1541 free_sec_add(ecp); 1542 free_sec_act(ecp); 1543 free(ecp); 1544 1545 exit(EXIT_SUCCESS); 1546 } 1547