contrib/elftoolchain/elfcopy/main.c

   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 3520 2017-04-17 01:47:52Z 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         {"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          * First processing of output sections: at this stage we copy the
 376          * content of each section from input to output object.  Section
 377          * content will be modified and printed (mcs) if need. Also content of
 378          * relocation section probably will be filtered and updated according
 379          * to symbol table changes.
 380          */
 381         copy_content(ecp);
 382
 383         /*
 384          * Write the underlying ehdr. Note that it should be called
 385          * before elf_setshstrndx() since it will overwrite e->e_shstrndx.
 386          */
 387         if (gelf_update_ehdr(ecp->eout, &oeh) == 0)
 388                 errx(EXIT_FAILURE, "gelf_update_ehdr() failed: %s",
 389                     elf_errmsg(-1));
 390
 391         /* Generate section name string table (.shstrtab). */
 392         set_shstrtab(ecp);
 393
 394         /*
 395          * Second processing of output sections: Update section headers.
 396          * At this stage we set name string index, update st_link and st_info
 397          * for output sections.
 398          */
 399         update_shdr(ecp, 1);
 400
 401         /* Renew oeh to get the updated e_shstrndx. */
 402         if (gelf_getehdr(ecp->eout, &oeh) == NULL)
 403                 errx(EXIT_FAILURE, "gelf_getehdr() failed: %s",
 404                     elf_errmsg(-1));
 405
 406         /*
 407          * Insert SHDR table into the internal section list as a "pseudo"
 408          * section, so later it will get sorted and resynced just as "normal"
 409          * sections.
 410          *
 411          * Under FreeBSD, Binutils objcopy always put the section header
 412          * at the end of all the sections. We want to do the same here.
 413          *
 414          * However, note that the behaviour is still different with Binutils:
 415          * elfcopy checks the FreeBSD OSABI tag to tell whether it needs to
 416          * move the section headers, while Binutils is probably configured
 417          * this way when it's compiled on FreeBSD.
 418          */
 419         if (oeh.e_ident[EI_OSABI] == ELFOSABI_FREEBSD)
 420                 shtab = insert_shtab(ecp, 1);
 421         else
 422                 shtab = insert_shtab(ecp, 0);
 423
 424         /*
 425          * Resync section offsets in the output object. This is needed
 426          * because probably sections are modified or new sections are added,
 427          * as a result overlap/gap might appears.
 428          */
 429         resync_sections(ecp);
 430
 431         /* Store SHDR offset in EHDR. */
 432         oeh.e_shoff = shtab->off;
 433
 434         /* Put program header table immediately after the Elf header. */
 435         if (ecp->ophnum > 0) {
 436                 oeh.e_phoff = gelf_fsize(ecp->eout, ELF_T_EHDR, 1, EV_CURRENT);
 437                 if (oeh.e_phoff == 0)
 438                         errx(EXIT_FAILURE, "gelf_fsize() failed: %s",
 439                             elf_errmsg(-1));
 440         }
 441
 442         /*
 443          * Update ELF object entry point if requested.
 444          */
 445         if (ecp->change_addr != 0)
 446                 oeh.e_entry += ecp->change_addr;
 447         if (ecp->flags & SET_START)
 448                 oeh.e_entry = ecp->set_start;
 449         if (ecp->change_start != 0)
 450                 oeh.e_entry += ecp->change_start;
 451
 452         /*
 453          * Update ehdr again before we call elf_update(), since we
 454          * modified e_shoff and e_phoff.
 455          */
 456         if (gelf_update_ehdr(ecp->eout, &oeh) == 0)
 457                 errx(EXIT_FAILURE, "gelf_update_ehdr() failed: %s",
 458                     elf_errmsg(-1));
 459
 460         if (ecp->ophnum > 0)
 461                 copy_phdr(ecp);
 462
 463         /* Write out the output elf object. */
 464         if (elf_update(ecp->eout, ELF_C_WRITE) < 0)
 465                 errx(EXIT_FAILURE, "elf_update() failed: %s",
 466                     elf_errmsg(-1));
 467
 468         /* Release allocated resource. */
 469         free_elf(ecp);
 470 }
 471
 472 void
 473 free_elf(struct elfcopy *ecp)
 474 {
 475         struct segment  *seg, *seg_temp;
 476         struct section  *sec, *sec_temp;
 477
 478         /* Free internal segment list. */
 479         if (!STAILQ_EMPTY(&ecp->v_seg)) {
 480                 STAILQ_FOREACH_SAFE(seg, &ecp->v_seg, seg_list, seg_temp) {
 481                         STAILQ_REMOVE(&ecp->v_seg, seg, segment, seg_list);
 482                         free(seg);
 483                 }
 484         }
 485
 486         /* Free symbol table buffers. */
 487         free_symtab(ecp);
 488
 489         /* Free internal section list. */
 490         if (!TAILQ_EMPTY(&ecp->v_sec)) {
 491                 TAILQ_FOREACH_SAFE(sec, &ecp->v_sec, sec_list, sec_temp) {
 492                         TAILQ_REMOVE(&ecp->v_sec, sec, sec_list);
 493                         if (sec->buf != NULL)
 494                                 free(sec->buf);
 495                         if (sec->newname != NULL)
 496                                 free(sec->newname);
 497                         if (sec->pad != NULL)
 498                                 free(sec->pad);
 499                         free(sec);
 500                 }
 501         }
 502
 503         ecp->symtab = NULL;
 504         ecp->strtab = NULL;
 505         ecp->shstrtab = NULL;
 506
 507         if (ecp->secndx != NULL) {
 508                 free(ecp->secndx);
 509                 ecp->secndx = NULL;
 510         }
 511 }
 512
 513 /* Create a temporary file. */
 514 void
 515 create_tempfile(char **fn, int *fd)
 516 {
 517         const char      *tmpdir;
 518         char            *cp, *tmpf;
 519         size_t           tlen, plen;
 520
 521 #define _TEMPFILE "ecp.XXXXXXXX"
 522 #define _TEMPFILEPATH "/tmp/ecp.XXXXXXXX"
 523
 524         if (fn == NULL || fd == NULL)
 525                 return;
 526         /* Repect TMPDIR environment variable. */
 527         tmpdir = getenv("TMPDIR");
 528         if (tmpdir != NULL && *tmpdir != '\0') {
 529                 tlen = strlen(tmpdir);
 530                 plen = strlen(_TEMPFILE);
 531                 tmpf = malloc(tlen + plen + 2);
 532                 if (tmpf == NULL)
 533                         err(EXIT_FAILURE, "malloc failed");
 534                 strncpy(tmpf, tmpdir, tlen);
 535                 cp = &tmpf[tlen - 1];
 536                 if (*cp++ != '/')
 537                         *cp++ = '/';
 538                 strncpy(cp, _TEMPFILE, plen);
 539                 cp[plen] = '\0';
 540         } else {
 541                 tmpf = strdup(_TEMPFILEPATH);
 542                 if (tmpf == NULL)
 543                         err(EXIT_FAILURE, "strdup failed");
 544         }
 545         if ((*fd = mkstemp(tmpf)) == -1)
 546                 err(EXIT_FAILURE, "mkstemp %s failed", tmpf);
 547         if (fchmod(*fd, 0644) == -1)
 548                 err(EXIT_FAILURE, "fchmod %s failed", tmpf);
 549         *fn = tmpf;
 550
 551 #undef _TEMPFILE
 552 #undef _TEMPFILEPATH
 553 }
 554
 555 /*
 556  * Copy temporary file with path src and file descriptor infd to path dst.
 557  * If in_place is set act as if editing the file in place, avoiding rename()
 558  * to preserve hard and symbolic links. Output file remains open, with file
 559  * descriptor returned in outfd.
 560  */
 561 static int
 562 copy_from_tempfile(const char *src, const char *dst, int infd, int *outfd,
 563     int in_place)
 564 {
 565         int tmpfd;
 566
 567         /*
 568          * First, check if we can use rename().
 569          */
 570         if (in_place == 0) {
 571                 if (rename(src, dst) >= 0) {
 572                         *outfd = infd;
 573                         return (0);
 574                 } else if (errno != EXDEV)
 575                         return (-1);
 576
 577                 /*
 578                  * If the rename() failed due to 'src' and 'dst' residing in
 579                  * two different file systems, invoke a helper function in
 580                  * libelftc to do the copy.
 581                  */
 582
 583                 if (unlink(dst) < 0)
 584                         return (-1);
 585         }
 586
 587         if ((tmpfd = open(dst, O_CREAT | O_TRUNC | O_WRONLY, 0755)) < 0)
 588                 return (-1);
 589
 590         if (elftc_copyfile(infd, tmpfd) < 0)
 591                 return (-1);
 592
 593         /*
 594          * Remove the temporary file from the file system
 595          * namespace, and close its file descriptor.
 596          */
 597         if (unlink(src) < 0)
 598                 return (-1);
 599
 600         (void) close(infd);
 601
 602         /*
 603          * Return the file descriptor for the destination.
 604          */
 605         *outfd = tmpfd;
 606
 607         return (0);
 608 }
 609
 610 static void
 611 create_file(struct elfcopy *ecp, const char *src, const char *dst)
 612 {
 613         struct stat      sb;
 614         char            *tempfile, *elftemp;
 615         int              efd, ifd, ofd, ofd0, tfd;
 616         int              in_place;
 617
 618         tempfile = NULL;
 619
 620         if (src == NULL)
 621                 errx(EXIT_FAILURE, "internal: src == NULL");
 622         if ((ifd = open(src, O_RDONLY)) == -1)
 623                 err(EXIT_FAILURE, "open %s failed", src);
 624
 625         if (fstat(ifd, &sb) == -1)
 626                 err(EXIT_FAILURE, "fstat %s failed", src);
 627
 628         if (dst == NULL)
 629                 create_tempfile(&tempfile, &ofd);
 630         else
 631                 if ((ofd = open(dst, O_RDWR|O_CREAT, 0755)) == -1)
 632                         err(EXIT_FAILURE, "open %s failed", dst);
 633
 634 #ifndef LIBELF_AR
 635         /* Detect and process ar(1) archive using libarchive. */
 636         if (ac_detect_ar(ifd)) {
 637                 ac_create_ar(ecp, ifd, ofd);
 638                 goto copy_done;
 639         }
 640 #endif
 641
 642         if (lseek(ifd, 0, SEEK_SET) < 0)
 643                 err(EXIT_FAILURE, "lseek failed");
 644
 645         /*
 646          * If input object is not ELF file, convert it to an intermediate
 647          * ELF object before processing.
 648          */
 649         if (ecp->itf != ETF_ELF) {
 650                 /*
 651                  * If the output object is not an ELF file, choose an arbitrary
 652                  * ELF format for the intermediate file. srec, ihex and binary
 653                  * formats are independent of class, endianness and machine
 654                  * type so these choices do not affect the output.
 655                  */
 656                 if (ecp->otf != ETF_ELF) {
 657                         if (ecp->oec == ELFCLASSNONE)
 658                                 ecp->oec = ELFCLASS64;
 659                         if (ecp->oed == ELFDATANONE)
 660                                 ecp->oed = ELFDATA2LSB;
 661                 }
 662                 create_tempfile(&elftemp, &efd);
 663                 if ((ecp->eout = elf_begin(efd, ELF_C_WRITE, NULL)) == NULL)
 664                         errx(EXIT_FAILURE, "elf_begin() failed: %s",
 665                             elf_errmsg(-1));
 666                 elf_flagelf(ecp->eout, ELF_C_SET, ELF_F_LAYOUT);
 667                 if (ecp->itf == ETF_BINARY)
 668                         create_elf_from_binary(ecp, ifd, src);
 669                 else if (ecp->itf == ETF_IHEX)
 670                         create_elf_from_ihex(ecp, ifd);
 671                 else if (ecp->itf == ETF_SREC)
 672                         create_elf_from_srec(ecp, ifd);
 673                 else
 674                         errx(EXIT_FAILURE, "Internal: invalid target flavour");
 675                 elf_end(ecp->eout);
 676
 677                 /* Open intermediate ELF object as new input object. */
 678                 close(ifd);
 679                 if ((ifd = open(elftemp, O_RDONLY)) == -1)
 680                         err(EXIT_FAILURE, "open %s failed", src);
 681                 close(efd);
 682                 if (unlink(elftemp) < 0)
 683                         err(EXIT_FAILURE, "unlink %s failed", elftemp);
 684                 free(elftemp);
 685         }
 686
 687         if ((ecp->ein = elf_begin(ifd, ELF_C_READ, NULL)) == NULL)
 688                 errx(EXIT_FAILURE, "elf_begin() failed: %s",
 689                     elf_errmsg(-1));
 690
 691         switch (elf_kind(ecp->ein)) {
 692         case ELF_K_NONE:
 693                 errx(EXIT_FAILURE, "file format not recognized");
 694         case ELF_K_ELF:
 695                 if ((ecp->eout = elf_begin(ofd, ELF_C_WRITE, NULL)) == NULL)
 696                         errx(EXIT_FAILURE, "elf_begin() failed: %s",
 697                             elf_errmsg(-1));
 698
 699                 /* elfcopy(1) manage ELF layout by itself. */
 700                 elf_flagelf(ecp->eout, ELF_C_SET, ELF_F_LAYOUT);
 701
 702                 /*
 703                  * Create output ELF object.
 704                  */
 705                 create_elf(ecp);
 706                 elf_end(ecp->eout);
 707
 708                 /*
 709                  * Convert the output ELF object to binary/srec/ihex if need.
 710                  */
 711                 if (ecp->otf != ETF_ELF) {
 712                         /*
 713                          * Create (another) tempfile for binary/srec/ihex
 714                          * output object.
 715                          */
 716                         if (tempfile != NULL) {
 717                                 if (unlink(tempfile) < 0)
 718                                         err(EXIT_FAILURE, "unlink %s failed",
 719                                             tempfile);
 720                                 free(tempfile);
 721                         }
 722                         create_tempfile(&tempfile, &ofd0);
 723
 724
 725                         /*
 726                          * Rewind the file descriptor being processed.
 727                          */
 728                         if (lseek(ofd, 0, SEEK_SET) < 0)
 729                                 err(EXIT_FAILURE,
 730                                     "lseek failed for the output object");
 731
 732                         /*
 733                          * Call flavour-specific conversion routine.
 734                          */
 735                         switch (ecp->otf) {
 736                         case ETF_BINARY:
 737                                 create_binary(ofd, ofd0);
 738                                 break;
 739                         case ETF_IHEX:
 740                                 create_ihex(ofd, ofd0);
 741                                 break;
 742                         case ETF_SREC:
 743                                 create_srec(ecp, ofd, ofd0,
 744                                     dst != NULL ? dst : src);
 745                                 break;
 746                         case ETF_PE:
 747                         case ETF_EFI:
 748 #if     WITH_PE
 749                                 create_pe(ecp, ofd, ofd0);
 750 #else
 751                                 errx(EXIT_FAILURE, "PE/EFI support not enabled"
 752                                     " at compile time");
 753 #endif
 754                                 break;
 755                         default:
 756                                 errx(EXIT_FAILURE, "Internal: unsupported"
 757                                     " output flavour %d", ecp->oec);
 758                         }
 759
 760                         close(ofd);
 761                         ofd = ofd0;
 762                 }
 763
 764                 break;
 765
 766         case ELF_K_AR:
 767                 /* XXX: Not yet supported. */
 768                 break;
 769         default:
 770                 errx(EXIT_FAILURE, "file format not supported");
 771         }
 772
 773         elf_end(ecp->ein);
 774
 775 #ifndef LIBELF_AR
 776 copy_done:
 777 #endif
 778
 779         if (tempfile != NULL) {
 780                 in_place = 0;
 781                 if (dst == NULL) {
 782                         dst = src;
 783                         if (lstat(dst, &sb) != -1 &&
 784                             (sb.st_nlink > 1 || S_ISLNK(sb.st_mode)))
 785                                 in_place = 1;
 786                 }
 787
 788                 if (copy_from_tempfile(tempfile, dst, ofd, &tfd, in_place) < 0)
 789                         err(EXIT_FAILURE, "creation of %s failed", dst);
 790
 791                 free(tempfile);
 792                 tempfile = NULL;
 793
 794                 ofd = tfd;
 795         }
 796
 797         if (strcmp(dst, "/dev/null") && fchmod(ofd, sb.st_mode) == -1)
 798                 err(EXIT_FAILURE, "fchmod %s failed", dst);
 799
 800         if ((ecp->flags & PRESERVE_DATE) &&
 801             elftc_set_timestamps(dst, &sb) < 0)
 802                 err(EXIT_FAILURE, "setting timestamps failed");
 803
 804         close(ifd);
 805         close(ofd);
 806 }
 807
 808 static void
 809 elfcopy_main(struct elfcopy *ecp, int argc, char **argv)
 810 {
 811         struct sec_action       *sac;
 812         const char              *infile, *outfile;
 813         char                    *fn, *s;
 814         int                      opt;
 815
 816         while ((opt = getopt_long(argc, argv, "dB:gG:I:j:K:L:N:O:pR:s:SwW:xXV",
 817             elfcopy_longopts, NULL)) != -1) {
 818                 switch(opt) {
 819                 case 'B':
 820                         /* ignored */
 821                         break;
 822                 case 'R':
 823                         sac = lookup_sec_act(ecp, optarg, 1);
 824                         if (sac->copy != 0)
 825                                 errx(EXIT_FAILURE,
 826                                     "both copy and remove specified");
 827                         sac->remove = 1;
 828                         ecp->flags |= SEC_REMOVE;
 829                         break;
 830                 case 'S':
 831                         ecp->strip = STRIP_ALL;
 832                         break;
 833                 case 'g':
 834                         ecp->strip = STRIP_DEBUG;
 835                         break;
 836                 case 'G':
 837                         ecp->flags |= KEEP_GLOBAL;
 838                         add_to_symop_list(ecp, optarg, NULL, SYMOP_KEEPG);
 839                         break;
 840                 case 'I':
 841                 case 's':
 842                         set_input_target(ecp, optarg);
 843                         break;
 844                 case 'j':
 845                         sac = lookup_sec_act(ecp, optarg, 1);
 846                         if (sac->remove != 0)
 847                                 errx(EXIT_FAILURE,
 848                                     "both copy and remove specified");
 849                         sac->copy = 1;
 850                         ecp->flags |= SEC_COPY;
 851                         break;
 852                 case 'K':
 853                         add_to_symop_list(ecp, optarg, NULL, SYMOP_KEEP);
 854                         break;
 855                 case 'L':
 856                         add_to_symop_list(ecp, optarg, NULL, SYMOP_LOCALIZE);
 857                         break;
 858                 case 'N':
 859                         add_to_symop_list(ecp, optarg, NULL, SYMOP_STRIP);
 860                         break;
 861                 case 'O':
 862                         set_output_target(ecp, optarg);
 863                         break;
 864                 case 'p':
 865                         ecp->flags |= PRESERVE_DATE;
 866                         break;
 867                 case 'V':
 868                         print_version();
 869                         break;
 870                 case 'w':
 871                         ecp->flags |= WILDCARD;
 872                         break;
 873                 case 'W':
 874                         add_to_symop_list(ecp, optarg, NULL, SYMOP_WEAKEN);
 875                         break;
 876                 case 'x':
 877                         ecp->flags |= DISCARD_LOCAL;
 878                         break;
 879                 case 'X':
 880                         ecp->flags |= DISCARD_LLABEL;
 881                         break;
 882                 case ECP_ADD_GNU_DEBUGLINK:
 883                         ecp->debuglink = optarg;
 884                         break;
 885                 case ECP_ADD_SECTION:
 886                         add_section(ecp, optarg);
 887                         break;
 888                 case ECP_CHANGE_ADDR:
 889                         ecp->change_addr = (int64_t) strtoll(optarg, NULL, 0);
 890                         break;
 891                 case ECP_CHANGE_SEC_ADDR:
 892                         parse_sec_address_op(ecp, opt, "--change-section-addr",
 893                             optarg);
 894                         break;
 895                 case ECP_CHANGE_SEC_LMA:
 896                         parse_sec_address_op(ecp, opt, "--change-section-lma",
 897                             optarg);
 898                         break;
 899                 case ECP_CHANGE_SEC_VMA:
 900                         parse_sec_address_op(ecp, opt, "--change-section-vma",
 901                             optarg);
 902                         break;
 903                 case ECP_CHANGE_START:
 904                         ecp->change_start = (int64_t) strtoll(optarg, NULL, 0);
 905                         break;
 906                 case ECP_CHANGE_WARN:
 907                         /* default */
 908                         break;
 909                 case ECP_GAP_FILL:
 910                         ecp->fill = (uint8_t) strtoul(optarg, NULL, 0);
 911                         ecp->flags |= GAP_FILL;
 912                         break;
 913                 case ECP_GLOBALIZE_SYMBOL:
 914                         add_to_symop_list(ecp, optarg, NULL, SYMOP_GLOBALIZE);
 915                         break;
 916                 case ECP_GLOBALIZE_SYMBOLS:
 917                         parse_symlist_file(ecp, optarg, SYMOP_GLOBALIZE);
 918                         break;
 919                 case ECP_KEEP_SYMBOLS:
 920                         parse_symlist_file(ecp, optarg, SYMOP_KEEP);
 921                         break;
 922                 case ECP_KEEP_GLOBAL_SYMBOLS:
 923                         parse_symlist_file(ecp, optarg, SYMOP_KEEPG);
 924                         break;
 925                 case ECP_LOCALIZE_HIDDEN:
 926                         ecp->flags |= LOCALIZE_HIDDEN;
 927                         break;
 928                 case ECP_LOCALIZE_SYMBOLS:
 929                         parse_symlist_file(ecp, optarg, SYMOP_LOCALIZE);
 930                         break;
 931                 case ECP_NO_CHANGE_WARN:
 932                         ecp->flags |= NO_CHANGE_WARN;
 933                         break;
 934                 case ECP_ONLY_DEBUG:
 935                         ecp->strip = STRIP_NONDEBUG;
 936                         break;
 937                 case ECP_ONLY_DWO:
 938                         ecp->strip = STRIP_NONDWO;
 939                         break;
 940                 case ECP_PAD_TO:
 941                         ecp->pad_to = (uint64_t) strtoull(optarg, NULL, 0);
 942                         break;
 943                 case ECP_PREFIX_ALLOC:
 944                         ecp->prefix_alloc = optarg;
 945                         break;
 946                 case ECP_PREFIX_SEC:
 947                         ecp->prefix_sec = optarg;
 948                         break;
 949                 case ECP_PREFIX_SYM:
 950                         ecp->prefix_sym = optarg;
 951                         break;
 952                 case ECP_REDEF_SYMBOL:
 953                         if ((s = strchr(optarg, '=')) == NULL)
 954                                 errx(EXIT_FAILURE,
 955                                     "illegal format for --redefine-sym");
 956                         *s++ = '\0';
 957                         add_to_symop_list(ecp, optarg, s, SYMOP_REDEF);
 958                         break;
 959                 case ECP_REDEF_SYMBOLS:
 960                         parse_symlist_file(ecp, optarg, SYMOP_REDEF);
 961                         break;
 962                 case ECP_RENAME_SECTION:
 963                         if ((fn = strchr(optarg, '=')) == NULL)
 964                                 errx(EXIT_FAILURE,
 965                                     "illegal format for --rename-section");
 966                         *fn++ = '\0';
 967
 968                         /* Check for optional flags. */
 969                         if ((s = strchr(fn, ',')) != NULL)
 970                                 *s++ = '\0';
 971
 972                         sac = lookup_sec_act(ecp, optarg, 1);
 973                         sac->rename = 1;
 974                         sac->newname = fn;
 975                         if (s != NULL)
 976                                 parse_sec_flags(sac, s);
 977                         break;
 978                 case ECP_SET_OSABI:
 979                         set_osabi(ecp, optarg);
 980                         break;
 981                 case ECP_SET_SEC_FLAGS:
 982                         if ((s = strchr(optarg, '=')) == NULL)
 983                                 errx(EXIT_FAILURE,
 984                                     "illegal format for --set-section-flags");
 985                         *s++ = '\0';
 986                         sac = lookup_sec_act(ecp, optarg, 1);
 987                         parse_sec_flags(sac, s);
 988                         break;
 989                 case ECP_SET_START:
 990                         ecp->flags |= SET_START;
 991                         ecp->set_start = (uint64_t) strtoull(optarg, NULL, 0);
 992                         break;
 993                 case ECP_SREC_FORCE_S3:
 994                         ecp->flags |= SREC_FORCE_S3;
 995                         break;
 996                 case ECP_SREC_LEN:
 997                         ecp->flags |= SREC_FORCE_LEN;
 998                         ecp->srec_len = strtoul(optarg, NULL, 0);
 999                         break;
1000                 case ECP_STRIP_DWO:
1001                         ecp->strip = STRIP_DWO;
1002                         break;
1003                 case ECP_STRIP_SYMBOLS:
1004                         parse_symlist_file(ecp, optarg, SYMOP_STRIP);
1005                         break;
1006                 case ECP_STRIP_UNNEEDED:
1007                         ecp->strip = STRIP_UNNEEDED;
1008                         break;
1009                 case ECP_WEAKEN_ALL:
1010                         ecp->flags |= WEAKEN_ALL;
1011                         break;
1012                 case ECP_WEAKEN_SYMBOLS:
1013                         parse_symlist_file(ecp, optarg, SYMOP_WEAKEN);
1014                         break;
1015                 default:
1016                         elfcopy_usage();
1017                 }
1018         }
1019
1020         if (optind == argc || optind + 2 < argc)
1021                 elfcopy_usage();
1022
1023         infile = argv[optind];
1024         outfile = NULL;
1025         if (optind + 1 < argc)
1026                 outfile = argv[optind + 1];
1027
1028         create_file(ecp, infile, outfile);
1029 }
1030
1031 static void
1032 mcs_main(struct elfcopy *ecp, int argc, char **argv)
1033 {
1034         struct sec_action       *sac;
1035         const char              *string;
1036         int                      append, delete, compress, name, print;
1037         int                      opt, i;
1038
1039         append = delete = compress = name = print = 0;
1040         string = NULL;
1041         while ((opt = getopt_long(argc, argv, "a:cdhn:pV", mcs_longopts,
1042                 NULL)) != -1) {
1043                 switch(opt) {
1044                 case 'a':
1045                         append = 1;
1046                         string = optarg; /* XXX multiple -a not supported */
1047                         break;
1048                 case 'c':
1049                         compress = 1;
1050                         break;
1051                 case 'd':
1052                         delete = 1;
1053                         break;
1054                 case 'n':
1055                         name = 1;
1056                         (void)lookup_sec_act(ecp, optarg, 1);
1057                         break;
1058                 case 'p':
1059                         print = 1;
1060                         break;
1061                 case 'V':
1062                         print_version();
1063                         break;
1064                 case 'h':
1065                 default:
1066                         mcs_usage();
1067                 }
1068         }
1069
1070         if (optind == argc)
1071                 mcs_usage();
1072
1073         /* Must specify one operation at least. */
1074         if (!append && !compress && !delete && !print)
1075                 mcs_usage();
1076
1077         /*
1078          * If we are going to delete, ignore other operations. This is
1079          * different from the Solaris implementation, which can print
1080          * and delete a section at the same time, for example. Also, this
1081          * implementation do not respect the order between operations that
1082          * user specified, i.e., "mcs -pc a.out" equals to "mcs -cp a.out".
1083          */
1084         if (delete) {
1085                 append = compress = print = 0;
1086                 ecp->flags |= SEC_REMOVE;
1087         }
1088         if (append)
1089                 ecp->flags |= SEC_APPEND;
1090         if (compress)
1091                 ecp->flags |= SEC_COMPRESS;
1092         if (print)
1093                 ecp->flags |= SEC_PRINT;
1094
1095         /* .comment is the default section to operate on. */
1096         if (!name)
1097                 (void)lookup_sec_act(ecp, ".comment", 1);
1098
1099         STAILQ_FOREACH(sac, &ecp->v_sac, sac_list) {
1100                 sac->append = append;
1101                 sac->compress = compress;
1102                 sac->print = print;
1103                 sac->remove = delete;
1104                 sac->string = string;
1105         }
1106
1107         for (i = optind; i < argc; i++) {
1108                 /* If only -p is specified, output to /dev/null */
1109                 if (print && !append && !compress && !delete)
1110                         create_file(ecp, argv[i], "/dev/null");
1111                 else
1112                         create_file(ecp, argv[i], NULL);
1113         }
1114 }
1115
1116 static void
1117 strip_main(struct elfcopy *ecp, int argc, char **argv)
1118 {
1119         struct sec_action       *sac;
1120         const char              *outfile;
1121         int                      opt;
1122         int                      i;
1123
1124         outfile = NULL;
1125         while ((opt = getopt_long(argc, argv, "hI:K:N:o:O:pR:sSdgVxXw",
1126             strip_longopts, NULL)) != -1) {
1127                 switch(opt) {
1128                 case 'R':
1129                         sac = lookup_sec_act(ecp, optarg, 1);
1130                         sac->remove = 1;
1131                         ecp->flags |= SEC_REMOVE;
1132                         break;
1133                 case 's':
1134                         ecp->strip = STRIP_ALL;
1135                         break;
1136                 case 'S':
1137                 case 'g':
1138                 case 'd':
1139                         ecp->strip = STRIP_DEBUG;
1140                         break;
1141                 case 'I':
1142                         /* ignored */
1143                         break;
1144                 case 'K':
1145                         add_to_symop_list(ecp, optarg, NULL, SYMOP_KEEP);
1146                         break;
1147                 case 'N':
1148                         add_to_symop_list(ecp, optarg, NULL, SYMOP_STRIP);
1149                         break;
1150                 case 'o':
1151                         outfile = optarg;
1152                         break;
1153                 case 'O':
1154                         set_output_target(ecp, optarg);
1155                         break;
1156                 case 'p':
1157                         ecp->flags |= PRESERVE_DATE;
1158                         break;
1159                 case 'V':
1160                         print_version();
1161                         break;
1162                 case 'w':
1163                         ecp->flags |= WILDCARD;
1164                         break;
1165                 case 'x':
1166                         ecp->flags |= DISCARD_LOCAL;
1167                         break;
1168                 case 'X':
1169                         ecp->flags |= DISCARD_LLABEL;
1170                         break;
1171                 case ECP_ONLY_DEBUG:
1172                         ecp->strip = STRIP_NONDEBUG;
1173                         break;
1174                 case ECP_STRIP_UNNEEDED:
1175                         ecp->strip = STRIP_UNNEEDED;
1176                         break;
1177                 case 'h':
1178                 default:
1179                         strip_usage();
1180                 }
1181         }
1182
1183         if (ecp->strip == 0 &&
1184             ((ecp->flags & DISCARD_LOCAL) == 0) &&
1185             ((ecp->flags & DISCARD_LLABEL) == 0) &&
1186             lookup_symop_list(ecp, NULL, SYMOP_STRIP) == NULL)
1187                 ecp->strip = STRIP_ALL;
1188         if (optind == argc)
1189                 strip_usage();
1190
1191         for (i = optind; i < argc; i++)
1192                 create_file(ecp, argv[i], outfile);
1193 }
1194
1195 static void
1196 parse_sec_flags(struct sec_action *sac, char *s)
1197 {
1198         const char      *flag;
1199         int              found, i;
1200
1201         for (flag = strtok(s, ","); flag; flag = strtok(NULL, ",")) {
1202                 found = 0;
1203                 for (i = 0; sec_flags[i].name != NULL; i++)
1204                         if (strcasecmp(sec_flags[i].name, flag) == 0) {
1205                                 sac->flags |= sec_flags[i].value;
1206                                 found = 1;
1207                                 break;
1208                         }
1209                 if (!found)
1210                         errx(EXIT_FAILURE, "unrecognized section flag %s",
1211                             flag);
1212         }
1213 }
1214
1215 static void
1216 parse_sec_address_op(struct elfcopy *ecp, int optnum, const char *optname,
1217     char *s)
1218 {
1219         struct sec_action       *sac;
1220         const char              *name;
1221         char                    *v;
1222         char                     op;
1223
1224         name = v = s;
1225         do {
1226                 v++;
1227         } while (*v != '\0' && *v != '=' && *v != '+' && *v != '-');
1228         if (*v == '\0' || *(v + 1) == '\0')
1229                 errx(EXIT_FAILURE, "invalid format for %s", optname);
1230         op = *v;
1231         *v++ = '\0';
1232         sac = lookup_sec_act(ecp, name, 1);
1233         switch (op) {
1234         case '=':
1235                 if (optnum == ECP_CHANGE_SEC_LMA ||
1236                     optnum == ECP_CHANGE_SEC_ADDR) {
1237                         sac->setlma = 1;
1238                         sac->lma = (uint64_t) strtoull(v, NULL, 0);
1239                 }
1240                 if (optnum == ECP_CHANGE_SEC_VMA ||
1241                     optnum == ECP_CHANGE_SEC_ADDR) {
1242                         sac->setvma = 1;
1243                         sac->vma = (uint64_t) strtoull(v, NULL, 0);
1244                 }
1245                 break;
1246         case '+':
1247                 if (optnum == ECP_CHANGE_SEC_LMA ||
1248                     optnum == ECP_CHANGE_SEC_ADDR)
1249                         sac->lma_adjust = (int64_t) strtoll(v, NULL, 0);
1250                 if (optnum == ECP_CHANGE_SEC_VMA ||
1251                     optnum == ECP_CHANGE_SEC_ADDR)
1252                         sac->vma_adjust = (int64_t) strtoll(v, NULL, 0);
1253                 break;
1254         case '-':
1255                 if (optnum == ECP_CHANGE_SEC_LMA ||
1256                     optnum == ECP_CHANGE_SEC_ADDR)
1257                         sac->lma_adjust = (int64_t) -strtoll(v, NULL, 0);
1258                 if (optnum == ECP_CHANGE_SEC_VMA ||
1259                     optnum == ECP_CHANGE_SEC_ADDR)
1260                         sac->vma_adjust = (int64_t) -strtoll(v, NULL, 0);
1261                 break;
1262         default:
1263                 break;
1264         }
1265 }
1266
1267 static void
1268 parse_symlist_file(struct elfcopy *ecp, const char *fn, unsigned int op)
1269 {
1270         struct symfile  *sf;
1271         struct stat      sb;
1272         FILE            *fp;
1273         char            *data, *p, *line, *end, *e, *n;
1274
1275         if (stat(fn, &sb) == -1)
1276                 err(EXIT_FAILURE, "stat %s failed", fn);
1277
1278         /* Check if we already read and processed this file. */
1279         STAILQ_FOREACH(sf, &ecp->v_symfile, symfile_list) {
1280                 if (sf->dev == sb.st_dev && sf->ino == sb.st_ino)
1281                         goto process_symfile;
1282         }
1283
1284         if ((fp = fopen(fn, "r")) == NULL)
1285                 err(EXIT_FAILURE, "can not open %s", fn);
1286         if ((data = malloc(sb.st_size + 1)) == NULL)
1287                 err(EXIT_FAILURE, "malloc failed");
1288         if (fread(data, 1, sb.st_size, fp) == 0 || ferror(fp))
1289                 err(EXIT_FAILURE, "fread failed");
1290         fclose(fp);
1291         data[sb.st_size] = '\0';
1292
1293         if ((sf = calloc(1, sizeof(*sf))) == NULL)
1294                 err(EXIT_FAILURE, "malloc failed");
1295         sf->dev = sb.st_dev;
1296         sf->ino = sb.st_ino;
1297         sf->size = sb.st_size + 1;
1298         sf->data = data;
1299
1300 process_symfile:
1301
1302         /*
1303          * Basically what we do here is to convert EOL to '\0', and remove
1304          * leading and trailing whitespaces for each line.
1305          */
1306
1307         end = sf->data + sf->size;
1308         line = NULL;
1309         for(p = sf->data; p < end; p++) {
1310                 if ((*p == '\t' || *p == ' ') && line == NULL)
1311                         continue;
1312                 if (*p == '\r' || *p == '\n' || *p == '\0') {
1313                         *p = '\0';
1314                         if (line == NULL)
1315                                 continue;
1316
1317                         /* Skip comment. */
1318                         if (*line == '#') {
1319                                 line = NULL;
1320                                 continue;
1321                         }
1322
1323                         e = p - 1;
1324                         while(e != line && (*e == '\t' || *e == ' '))
1325                                 *e-- = '\0';
1326                         if (op != SYMOP_REDEF)
1327                                 add_to_symop_list(ecp, line, NULL, op);
1328                         else {
1329                                 if (strlen(line) < 3)
1330                                         errx(EXIT_FAILURE,
1331                                             "illegal format for"
1332                                             " --redefine-sym");
1333                                 for(n = line + 1; n < e; n++) {
1334                                         if (*n == ' ' || *n == '\t') {
1335                                                 while(*n == ' ' || *n == '\t')
1336                                                         *n++ = '\0';
1337                                                 break;
1338                                         }
1339                                 }
1340                                 if (n >= e)
1341                                         errx(EXIT_FAILURE,
1342                                             "illegal format for"
1343                                             " --redefine-sym");
1344                                 add_to_symop_list(ecp, line, n, op);
1345                         }
1346                         line = NULL;
1347                         continue;
1348                 }
1349
1350                 if (line == NULL)
1351                         line = p;
1352         }
1353 }
1354
1355 static void
1356 set_input_target(struct elfcopy *ecp, const char *target_name)
1357 {
1358         Elftc_Bfd_Target *tgt;
1359
1360         if ((tgt = elftc_bfd_find_target(target_name)) == NULL)
1361                 errx(EXIT_FAILURE, "%s: invalid target name", target_name);
1362         ecp->itf = elftc_bfd_target_flavor(tgt);
1363 }
1364
1365 static void
1366 set_output_target(struct elfcopy *ecp, const char *target_name)
1367 {
1368         Elftc_Bfd_Target *tgt;
1369
1370         if ((tgt = elftc_bfd_find_target(target_name)) == NULL)
1371                 errx(EXIT_FAILURE, "%s: invalid target name", target_name);
1372         ecp->otf = elftc_bfd_target_flavor(tgt);
1373         if (ecp->otf == ETF_ELF) {
1374                 ecp->oec = elftc_bfd_target_class(tgt);
1375                 ecp->oed = elftc_bfd_target_byteorder(tgt);
1376                 ecp->oem = elftc_bfd_target_machine(tgt);
1377         }
1378         if (ecp->otf == ETF_EFI || ecp->otf == ETF_PE)
1379                 ecp->oem = elftc_bfd_target_machine(tgt);
1380
1381         ecp->otgt = target_name;
1382 }
1383
1384 static void
1385 set_osabi(struct elfcopy *ecp, const char *abi)
1386 {
1387         int i, found;
1388
1389         found = 0;
1390         for (i = 0; osabis[i].name != NULL; i++)
1391                 if (strcasecmp(osabis[i].name, abi) == 0) {
1392                         ecp->abi = osabis[i].abi;
1393                         found = 1;
1394                         break;
1395                 }
1396         if (!found)
1397                 errx(EXIT_FAILURE, "unrecognized OSABI %s", abi);
1398 }
1399
1400 #define ELFCOPY_USAGE_MESSAGE   "\
1401 Usage: %s [options] infile [outfile]\n\
1402   Transform object files.\n\n\
1403   Options:\n\
1404   -d | -g | --strip-debug      Remove debugging information from the output.\n\
1405   -j SECTION | --only-section=SECTION\n\
1406                                Copy only the named section to the output.\n\
1407   -p | --preserve-dates        Preserve access and modification times.\n\
1408   -w | --wildcard              Use shell-style patterns to name symbols.\n\
1409   -x | --discard-all           Do not copy non-globals to the output.\n\
1410   -I FORMAT | --input-target=FORMAT\n\
1411                                Specify object format for the input file.\n\
1412   -K SYM | --keep-symbol=SYM   Copy symbol SYM to the output.\n\
1413   -L SYM | --localize-symbol=SYM\n\
1414                                Make symbol SYM local to the output file.\n\
1415   -N SYM | --strip-symbol=SYM  Do not copy symbol SYM to the output.\n\
1416   -O FORMAT | --output-target=FORMAT\n\
1417                                Specify object format for the output file.\n\
1418                                FORMAT should be a target name understood by\n\
1419                                elftc_bfd_find_target(3).\n\
1420   -R NAME | --remove-section=NAME\n\
1421                                Remove the named section.\n\
1422   -S | --strip-all             Remove all symbol and relocation information\n\
1423                                from the output.\n\
1424   -V | --version               Print a version identifier and exit.\n\
1425   -W SYM | --weaken-symbol=SYM Mark symbol SYM as weak in the output.\n\
1426   -X | --discard-locals        Do not copy compiler generated symbols to\n\
1427                                the output.\n\
1428   --add-section NAME=FILE      Add the contents of FILE to the ELF object as\n\
1429                                a new section named NAME.\n\
1430   --adjust-section-vma SECTION{=,+,-}VAL | \\\n\
1431     --change-section-address SECTION{=,+,-}VAL\n\
1432                                Set or adjust the VMA and the LMA of the\n\
1433                                named section by VAL.\n\
1434   --adjust-start=INCR | --change-start=INCR\n\
1435                                Add INCR to the start address for the ELF\n\
1436                                object.\n\
1437   --adjust-vma=INCR | --change-addresses=INCR\n\
1438                                Increase the VMA and LMA of all sections by\n\
1439                                INCR.\n\
1440   --adjust-warning | --change-warnings\n\
1441                                Issue warnings for non-existent sections.\n\
1442   --change-section-lma SECTION{=,+,-}VAL\n\
1443                                Set or adjust the LMA address of the named\n\
1444                                section by VAL.\n\
1445   --change-section-vma SECTION{=,+,-}VAL\n\
1446                                Set or adjust the VMA address of the named\n\
1447                                section by VAL.\n\
1448   --gap-fill=VAL               Fill the gaps between sections with bytes\n\
1449                                of value VAL.\n\
1450   --localize-hidden            Make all hidden symbols local to the output\n\
1451                                file.\n\
1452   --no-adjust-warning| --no-change-warnings\n\
1453                                Do not issue warnings for non-existent\n\
1454                                sections.\n\
1455   --only-keep-debug            Copy only debugging information.\n\
1456   --output-target=FORMAT       Use the specified format for the output.\n\
1457   --pad-to=ADDRESS             Pad the output object up to the given address.\n\
1458   --prefix-alloc-sections=STRING\n\
1459                                Prefix the section names of all the allocated\n\
1460                                sections with STRING.\n\
1461   --prefix-sections=STRING     Prefix the section names of all the sections\n\
1462                                with STRING.\n\
1463   --prefix-symbols=STRING      Prefix the symbol names of all the symbols\n\
1464                                with STRING.\n\
1465   --rename-section OLDNAME=NEWNAME[,FLAGS]\n\
1466                                Rename and optionally change section flags.\n\
1467   --set-section-flags SECTION=FLAGS\n\
1468                                Set section flags for the named section.\n\
1469                                Supported flags are: 'alloc', 'code',\n\
1470                                'contents', 'data', 'debug', 'load',\n\
1471                                'noload', 'readonly', 'rom', and 'shared'.\n\
1472   --set-start=ADDRESS          Set the start address of the ELF object.\n\
1473   --srec-forceS3               Only generate S3 S-Records.\n\
1474   --srec-len=LEN               Set the maximum length of a S-Record line.\n\
1475   --strip-unneeded             Do not copy relocation information.\n"
1476
1477 static void
1478 elfcopy_usage(void)
1479 {
1480         (void) fprintf(stderr, ELFCOPY_USAGE_MESSAGE, ELFTC_GETPROGNAME());
1481         exit(EXIT_FAILURE);
1482 }
1483
1484 #define MCS_USAGE_MESSAGE       "\
1485 Usage: %s [options] file...\n\
1486   Manipulate the comment section in an ELF object.\n\n\
1487   Options:\n\
1488   -a STRING        Append 'STRING' to the comment section.\n\
1489   -c               Remove duplicate entries from the comment section.\n\
1490   -d               Delete the comment section.\n\
1491   -h | --help      Print a help message and exit.\n\
1492   -n NAME          Operate on the ELF section with name 'NAME'.\n\
1493   -p               Print the contents of the comment section.\n\
1494   -V | --version   Print a version identifier and exit.\n"
1495
1496 static void
1497 mcs_usage(void)
1498 {
1499         (void) fprintf(stderr, MCS_USAGE_MESSAGE, ELFTC_GETPROGNAME());
1500         exit(EXIT_FAILURE);
1501 }
1502
1503 #define STRIP_USAGE_MESSAGE     "\
1504 Usage: %s [options] file...\n\
1505   Discard information from ELF objects.\n\n\
1506   Options:\n\
1507   -d | -g | -S | --strip-debug    Remove debugging symbols.\n\
1508   -h | --help                     Print a help message.\n\
1509   -o FILE | --output-file FILE    Write output to FILE.\n\
1510   --only-keep-debug               Keep debugging information only.\n\
1511   -p | --preserve-dates           Preserve access and modification times.\n\
1512   -s | --strip-all                Remove all symbols.\n\
1513   --strip-unneeded                Remove symbols not needed for relocation\n\
1514                                   processing.\n\
1515   -w | --wildcard                 Use shell-style patterns to name symbols.\n\
1516   -x | --discard-all              Discard all non-global symbols.\n\
1517   -I TGT| --input-target=TGT      (Accepted, but ignored).\n\
1518   -K SYM | --keep-symbol=SYM      Keep symbol 'SYM' in the output.\n\
1519   -N SYM | --strip-symbol=SYM     Remove symbol 'SYM' from the output.\n\
1520   -O TGT | --output-target=TGT    Set the output file format to 'TGT'.\n\
1521   -R SEC | --remove-section=SEC   Remove the section named 'SEC'.\n\
1522   -V | --version                  Print a version identifier and exit.\n\
1523   -X | --discard-locals           Remove compiler-generated local symbols.\n"
1524
1525 static void
1526 strip_usage(void)
1527 {
1528         (void) fprintf(stderr, STRIP_USAGE_MESSAGE, ELFTC_GETPROGNAME());
1529         exit(EXIT_FAILURE);
1530 }
1531
1532 static void
1533 print_version(void)
1534 {
1535         (void) printf("%s (%s)\n", ELFTC_GETPROGNAME(), elftc_version());
1536         exit(EXIT_SUCCESS);
1537 }
1538
1539 /*
1540  * Compare the ending of s with end.
1541  */
1542 static int
1543 strrcmp(const char *s, const char *end)
1544 {
1545         size_t endlen, slen;
1546
1547         slen = strlen(s);
1548         endlen = strlen(end);
1549
1550         if (slen >= endlen)
1551                 s += slen - endlen;
1552         return (strcmp(s, end));
1553 }
1554
1555 int
1556 main(int argc, char **argv)
1557 {
1558         struct elfcopy *ecp;
1559
1560         if (elf_version(EV_CURRENT) == EV_NONE)
1561                 errx(EXIT_FAILURE, "ELF library initialization failed: %s",
1562                     elf_errmsg(-1));
1563
1564         ecp = calloc(1, sizeof(*ecp));
1565         if (ecp == NULL)
1566                 err(EXIT_FAILURE, "calloc failed");
1567         memset(ecp, 0, sizeof(*ecp));
1568
1569         ecp->itf = ecp->otf = ETF_ELF;
1570         ecp->iec = ecp->oec = ELFCLASSNONE;
1571         ecp->oed = ELFDATANONE;
1572         ecp->abi = -1;
1573         /* There is always an empty section. */
1574         ecp->nos = 1;
1575         ecp->fill = 0;
1576
1577         STAILQ_INIT(&ecp->v_seg);
1578         STAILQ_INIT(&ecp->v_sac);
1579         STAILQ_INIT(&ecp->v_sadd);
1580         STAILQ_INIT(&ecp->v_symop);
1581         STAILQ_INIT(&ecp->v_symfile);
1582         STAILQ_INIT(&ecp->v_arobj);
1583         TAILQ_INIT(&ecp->v_sec);
1584
1585         if ((ecp->progname = ELFTC_GETPROGNAME()) == NULL)
1586                 ecp->progname = "elfcopy";
1587
1588         if (strrcmp(ecp->progname, "strip") == 0)
1589                 strip_main(ecp, argc, argv);
1590         else if (strrcmp(ecp->progname, "mcs") == 0)
1591                 mcs_main(ecp, argc, argv);
1592         else {
1593                 if (strrcmp(ecp->progname, "elfcopy") != 0 &&
1594                     strrcmp(ecp->progname, "objcopy") != 0)
1595                         warnx("program mode not known, defaulting to elfcopy");
1596                 elfcopy_main(ecp, argc, argv);
1597         }
1598
1599         free_sec_add(ecp);
1600         free_sec_act(ecp);
1601         free(ecp);
1602
1603         exit(EXIT_SUCCESS);
1604 }