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 3446 2016-05-03 01:31:17Z emaste $");
  43
  44 enum options
  45 {
  46         ECP_ADD_GNU_DEBUGLINK,
  47         ECP_ADD_SECTION,
  48         ECP_CHANGE_ADDR,
  49         ECP_CHANGE_SEC_ADDR,
  50         ECP_CHANGE_SEC_LMA,
  51         ECP_CHANGE_SEC_VMA,
  52         ECP_CHANGE_START,
  53         ECP_CHANGE_WARN,
  54         ECP_GAP_FILL,
  55         ECP_GLOBALIZE_SYMBOL,
  56         ECP_GLOBALIZE_SYMBOLS,
  57         ECP_KEEP_SYMBOLS,
  58         ECP_KEEP_GLOBAL_SYMBOLS,
  59         ECP_LOCALIZE_HIDDEN,
  60         ECP_LOCALIZE_SYMBOLS,
  61         ECP_NO_CHANGE_WARN,
  62         ECP_ONLY_DEBUG,
  63         ECP_ONLY_DWO,
  64         ECP_PAD_TO,
  65         ECP_PREFIX_ALLOC,
  66         ECP_PREFIX_SEC,
  67         ECP_PREFIX_SYM,
  68         ECP_REDEF_SYMBOL,
  69         ECP_REDEF_SYMBOLS,
  70         ECP_RENAME_SECTION,
  71         ECP_SET_OSABI,
  72         ECP_SET_SEC_FLAGS,
  73         ECP_SET_START,
  74         ECP_SREC_FORCE_S3,
  75         ECP_SREC_LEN,
  76         ECP_STRIP_DWO,
  77         ECP_STRIP_SYMBOLS,
  78         ECP_STRIP_UNNEEDED,
  79         ECP_WEAKEN_ALL,
  80         ECP_WEAKEN_SYMBOLS
  81 };
  82
  83 static struct option mcs_longopts[] =
  84 {
  85         { "help", no_argument, NULL, 'h' },
  86         { "version", no_argument, NULL, 'V' },
  87         { NULL, 0, NULL, 0 }
  88 };
  89
  90 static struct option strip_longopts[] =
  91 {
  92         {"discard-all", no_argument, NULL, 'x'},
  93         {"discard-locals", no_argument, NULL, 'X'},
  94         {"help", no_argument, NULL, 'h'},
  95         {"input-target", required_argument, NULL, 'I'},
  96         {"keep-symbol", required_argument, NULL, 'K'},
  97         {"only-keep-debug", no_argument, NULL, ECP_ONLY_DEBUG},
  98         {"output-file", required_argument, NULL, 'o'},
  99         {"output-target", required_argument, NULL, 'O'},
 100         {"preserve-dates", no_argument, NULL, 'p'},
 101         {"remove-section", required_argument, NULL, 'R'},
 102         {"strip-all", no_argument, NULL, 's'},
 103         {"strip-debug", no_argument, NULL, 'S'},
 104         {"strip-symbol", required_argument, NULL, 'N'},
 105         {"strip-unneeded", no_argument, NULL, ECP_STRIP_UNNEEDED},
 106         {"version", no_argument, NULL, 'V'},
 107         {"wildcard", no_argument, NULL, 'w'},
 108         {NULL, 0, NULL, 0}
 109 };
 110
 111 static struct option elfcopy_longopts[] =
 112 {
 113         {"add-gnu-debuglink", required_argument, NULL, ECP_ADD_GNU_DEBUGLINK},
 114         {"add-section", required_argument, NULL, ECP_ADD_SECTION},
 115         {"adjust-section-vma", required_argument, NULL, ECP_CHANGE_SEC_ADDR},
 116         {"adjust-vma", required_argument, NULL, ECP_CHANGE_ADDR},
 117         {"adjust-start", required_argument, NULL, ECP_CHANGE_START},
 118         {"adjust-warnings", no_argument, NULL, ECP_CHANGE_WARN},
 119         {"binary-architecture", required_argument, NULL, 'B'},
 120         {"change-addresses", required_argument, NULL, ECP_CHANGE_ADDR},
 121         {"change-section-address", required_argument, NULL,
 122          ECP_CHANGE_SEC_ADDR},
 123         {"change-section-lma", required_argument, NULL, ECP_CHANGE_SEC_LMA},
 124         {"change-section-vma", required_argument, NULL, ECP_CHANGE_SEC_VMA},
 125         {"change-start", required_argument, NULL, ECP_CHANGE_START},
 126         {"change-warnings", no_argument, NULL, ECP_CHANGE_WARN},
 127         {"discard-all", no_argument, NULL, 'x'},
 128         {"discard-locals", no_argument, NULL, 'X'},
 129         {"extract-dwo", no_argument, NULL, ECP_ONLY_DWO},
 130         {"gap-fill", required_argument, NULL, ECP_GAP_FILL},
 131         {"globalize-symbol", required_argument, NULL, ECP_GLOBALIZE_SYMBOL},
 132         {"globalize-symbols", required_argument, NULL, ECP_GLOBALIZE_SYMBOLS},
 133         {"help", no_argument, NULL, 'h'},
 134         {"input-target", required_argument, NULL, 'I'},
 135         {"keep-symbol", required_argument, NULL, 'K'},
 136         {"keep-symbols", required_argument, NULL, ECP_KEEP_SYMBOLS},
 137         {"keep-global-symbol", required_argument, NULL, 'G'},
 138         {"keep-global-symbols", required_argument, NULL,
 139          ECP_KEEP_GLOBAL_SYMBOLS},
 140         {"localize-hidden", no_argument, NULL, ECP_LOCALIZE_HIDDEN},
 141         {"localize-symbol", required_argument, NULL, 'L'},
 142         {"localize-symbols", required_argument, NULL, ECP_LOCALIZE_SYMBOLS},
 143         {"no-adjust-warnings", no_argument, NULL, ECP_NO_CHANGE_WARN},
 144         {"no-change-warnings", no_argument, NULL, ECP_NO_CHANGE_WARN},
 145         {"only-keep-debug", no_argument, NULL, ECP_ONLY_DEBUG},
 146         {"only-section", required_argument, NULL, 'j'},
 147         {"osabi", required_argument, NULL, ECP_SET_OSABI},
 148         {"output-target", required_argument, NULL, 'O'},
 149         {"pad-to", required_argument, NULL, ECP_PAD_TO},
 150         {"preserve-dates", no_argument, NULL, 'p'},
 151         {"prefix-alloc-sections", required_argument, NULL, ECP_PREFIX_ALLOC},
 152         {"prefix-sections", required_argument, NULL, ECP_PREFIX_SEC},
 153         {"prefix-symbols", required_argument, NULL, ECP_PREFIX_SYM},
 154         {"redefine-sym", required_argument, NULL, ECP_REDEF_SYMBOL},
 155         {"redefine-syms", required_argument, NULL, ECP_REDEF_SYMBOLS},
 156         {"remove-section", required_argument, NULL, 'R'},
 157         {"rename-section", required_argument, NULL, ECP_RENAME_SECTION},
 158         {"set-section-flags", required_argument, NULL, ECP_SET_SEC_FLAGS},
 159         {"set-start", required_argument, NULL, ECP_SET_START},
 160         {"srec-forceS3", no_argument, NULL, ECP_SREC_FORCE_S3},
 161         {"srec-len", required_argument, NULL, ECP_SREC_LEN},
 162         {"strip-all", no_argument, NULL, 'S'},
 163         {"strip-debug", no_argument, 0, 'g'},
 164         {"strip-dwo", no_argument, NULL, ECP_STRIP_DWO},
 165         {"strip-symbol", required_argument, NULL, 'N'},
 166         {"strip-symbols", required_argument, NULL, ECP_STRIP_SYMBOLS},
 167         {"strip-unneeded", no_argument, NULL, ECP_STRIP_UNNEEDED},
 168         {"version", no_argument, NULL, 'V'},
 169         {"weaken", no_argument, NULL, ECP_WEAKEN_ALL},
 170         {"weaken-symbol", required_argument, NULL, 'W'},
 171         {"weaken-symbols", required_argument, NULL, ECP_WEAKEN_SYMBOLS},
 172         {"wildcard", no_argument, NULL, 'w'},
 173         {NULL, 0, NULL, 0}
 174 };
 175
 176 static struct {
 177         const char *name;
 178         int value;
 179 } sec_flags[] = {
 180         {"alloc", SF_ALLOC},
 181         {"load", SF_LOAD},
 182         {"noload", SF_NOLOAD},
 183         {"readonly", SF_READONLY},
 184         {"debug", SF_DEBUG},
 185         {"code", SF_CODE},
 186         {"data", SF_DATA},
 187         {"rom", SF_ROM},
 188         {"share", SF_SHARED},
 189         {"contents", SF_CONTENTS},
 190         {NULL, 0}
 191 };
 192
 193 static struct {
 194         const char *name;
 195         int abi;
 196 } osabis[] = {
 197         {"sysv", ELFOSABI_SYSV},
 198         {"hpus", ELFOSABI_HPUX},
 199         {"netbsd", ELFOSABI_NETBSD},
 200         {"linux", ELFOSABI_LINUX},
 201         {"hurd", ELFOSABI_HURD},
 202         {"86open", ELFOSABI_86OPEN},
 203         {"solaris", ELFOSABI_SOLARIS},
 204         {"aix", ELFOSABI_AIX},
 205         {"irix", ELFOSABI_IRIX},
 206         {"freebsd", ELFOSABI_FREEBSD},
 207         {"tru64", ELFOSABI_TRU64},
 208         {"modesto", ELFOSABI_MODESTO},
 209         {"openbsd", ELFOSABI_OPENBSD},
 210         {"openvms", ELFOSABI_OPENVMS},
 211         {"nsk", ELFOSABI_NSK},
 212         {"cloudabi", ELFOSABI_CLOUDABI},
 213         {"arm", ELFOSABI_ARM},
 214         {"standalone", ELFOSABI_STANDALONE},
 215         {NULL, 0}
 216 };
 217
 218 static int      copy_from_tempfile(const char *src, const char *dst,
 219     int infd, int *outfd, int in_place);
 220 static void     create_file(struct elfcopy *ecp, const char *src,
 221     const char *dst);
 222 static void     elfcopy_main(struct elfcopy *ecp, int argc, char **argv);
 223 static void     elfcopy_usage(void);
 224 static void     mcs_main(struct elfcopy *ecp, int argc, char **argv);
 225 static void     mcs_usage(void);
 226 static void     parse_sec_address_op(struct elfcopy *ecp, int optnum,
 227     const char *optname, char *s);
 228 static void     parse_sec_flags(struct sec_action *sac, char *s);
 229 static void     parse_symlist_file(struct elfcopy *ecp, const char *fn,
 230     unsigned int op);
 231 static void     print_version(void);
 232 static void     set_input_target(struct elfcopy *ecp, const char *target_name);
 233 static void     set_osabi(struct elfcopy *ecp, const char *abi);
 234 static void     set_output_target(struct elfcopy *ecp, const char *target_name);
 235 static void     strip_main(struct elfcopy *ecp, int argc, char **argv);
 236 static void     strip_usage(void);
 237
 238 /*
 239  * An ELF object usually has a structure described by the
 240  * diagram below.
 241  *  _____________
 242  * |             |
 243  * |     NULL    | <- always a SHT_NULL section
 244  * |_____________|
 245  * |             |
 246  * |   .interp   |
 247  * |_____________|
 248  * |             |
 249  * |     ...     |
 250  * |_____________|
 251  * |             |
 252  * |    .text    |
 253  * |_____________|
 254  * |             |
 255  * |     ...     |
 256  * |_____________|
 257  * |             |
 258  * |  .comment   | <- above(include) this: normal sections
 259  * |_____________|
 260  * |             |
 261  * | add sections| <- unloadable sections added by --add-section
 262  * |_____________|
 263  * |             |
 264  * |  .shstrtab  | <- section name string table
 265  * |_____________|
 266  * |             |
 267  * |    shdrs    | <- section header table
 268  * |_____________|
 269  * |             |
 270  * |   .symtab   | <- symbol table, if any
 271  * |_____________|
 272  * |             |
 273  * |   .strtab   | <- symbol name string table, if any
 274  * |_____________|
 275  * |             |
 276  * |  .rel.text  | <- relocation info for .o files.
 277  * |_____________|
 278  */
 279 void
 280 create_elf(struct elfcopy *ecp)
 281 {
 282         struct section  *shtab;
 283         GElf_Ehdr        ieh;
 284         GElf_Ehdr        oeh;
 285         size_t           ishnum;
 286
 287         ecp->flags |= SYMTAB_INTACT;
 288
 289         /* Create EHDR. */
 290         if (gelf_getehdr(ecp->ein, &ieh) == NULL)
 291                 errx(EXIT_FAILURE, "gelf_getehdr() failed: %s",
 292                     elf_errmsg(-1));
 293         if ((ecp->iec = gelf_getclass(ecp->ein)) == ELFCLASSNONE)
 294                 errx(EXIT_FAILURE, "getclass() failed: %s",
 295                     elf_errmsg(-1));
 296
 297         if (ecp->oec == ELFCLASSNONE)
 298                 ecp->oec = ecp->iec;
 299         if (ecp->oed == ELFDATANONE)
 300                 ecp->oed = ieh.e_ident[EI_DATA];
 301
 302         if (gelf_newehdr(ecp->eout, ecp->oec) == NULL)
 303                 errx(EXIT_FAILURE, "gelf_newehdr failed: %s",
 304                     elf_errmsg(-1));
 305         if (gelf_getehdr(ecp->eout, &oeh) == NULL)
 306                 errx(EXIT_FAILURE, "gelf_getehdr() failed: %s",
 307                     elf_errmsg(-1));
 308
 309         memcpy(oeh.e_ident, ieh.e_ident, sizeof(ieh.e_ident));
 310         oeh.e_ident[EI_CLASS] = ecp->oec;
 311         oeh.e_ident[EI_DATA]  = ecp->oed;
 312         if (ecp->abi != -1)
 313                 oeh.e_ident[EI_OSABI] = ecp->abi;
 314         oeh.e_flags           = ieh.e_flags;
 315         oeh.e_machine         = ieh.e_machine;
 316         oeh.e_type            = ieh.e_type;
 317         oeh.e_entry           = ieh.e_entry;
 318         oeh.e_version         = ieh.e_version;
 319
 320         ecp->flags &= ~(EXECUTABLE | DYNAMIC | RELOCATABLE);
 321         if (ieh.e_type == ET_EXEC)
 322                 ecp->flags |= EXECUTABLE;
 323         else if (ieh.e_type == ET_DYN)
 324                 ecp->flags |= DYNAMIC;
 325         else if (ieh.e_type == ET_REL)
 326                 ecp->flags |= RELOCATABLE;
 327         else
 328                 errx(EXIT_FAILURE, "unsupported e_type");
 329
 330         if (!elf_getshnum(ecp->ein, &ishnum))
 331                 errx(EXIT_FAILURE, "elf_getshnum failed: %s",
 332                     elf_errmsg(-1));
 333         if (ishnum > 0 && (ecp->secndx = calloc(ishnum,
 334             sizeof(*ecp->secndx))) == NULL)
 335                 err(EXIT_FAILURE, "calloc failed");
 336
 337         /* Read input object program header. */
 338         setup_phdr(ecp);
 339
 340         /*
 341          * Scan of input sections: we iterate through sections from input
 342          * object, skip sections need to be stripped, allot Elf_Scn and
 343          * create internal section structure for sections we want.
 344          * (i.e., determine output sections)
 345          */
 346         create_scn(ecp);
 347
 348         /* Apply section address changes, if any. */
 349         adjust_addr(ecp);
 350
 351         /*
 352          * Determine if the symbol table needs to be changed based on
 353          * command line options.
 354          */
 355         if (ecp->strip == STRIP_DEBUG ||
 356             ecp->strip == STRIP_UNNEEDED ||
 357             ecp->flags & WEAKEN_ALL ||
 358             ecp->flags & LOCALIZE_HIDDEN ||
 359             ecp->flags & DISCARD_LOCAL ||
 360             ecp->flags & DISCARD_LLABEL ||
 361             ecp->prefix_sym != NULL ||
 362             !STAILQ_EMPTY(&ecp->v_symop))
 363                 ecp->flags &= ~SYMTAB_INTACT;
 364
 365         /*
 366          * Create symbol table. Symbols are filtered or stripped according to
 367          * command line args specified by user, and later updated for the new
 368          * layout of sections in the output object.
 369          */
 370         if ((ecp->flags & SYMTAB_EXIST) != 0)
 371                 create_symtab(ecp);
 372
 373         /*
 374          * First processing of output sections: at this stage we copy the
 375          * content of each section from input to output object.  Section
 376          * content will be modified and printed (mcs) if need. Also content of
 377          * relocation section probably will be filtered and updated according
 378          * to symbol table changes.
 379          */
 380         copy_content(ecp);
 381
 382         /*
 383          * Write the underlying ehdr. Note that it should be called
 384          * before elf_setshstrndx() since it will overwrite e->e_shstrndx.
 385          */
 386         if (gelf_update_ehdr(ecp->eout, &oeh) == 0)
 387                 errx(EXIT_FAILURE, "gelf_update_ehdr() failed: %s",
 388                     elf_errmsg(-1));
 389
 390         /* Generate section name string table (.shstrtab). */
 391         set_shstrtab(ecp);
 392
 393         /*
 394          * Second processing of output sections: Update section headers.
 395          * At this stage we set name string index, update st_link and st_info
 396          * for output sections.
 397          */
 398         update_shdr(ecp, 1);
 399
 400         /* Renew oeh to get the updated e_shstrndx. */
 401         if (gelf_getehdr(ecp->eout, &oeh) == NULL)
 402                 errx(EXIT_FAILURE, "gelf_getehdr() failed: %s",
 403                     elf_errmsg(-1));
 404
 405         /*
 406          * Insert SHDR table into the internal section list as a "pseudo"
 407          * section, so later it will get sorted and resynced just as "normal"
 408          * sections.
 409          *
 410          * Under FreeBSD, Binutils objcopy always put the section header
 411          * at the end of all the sections. We want to do the same here.
 412          *
 413          * However, note that the behaviour is still different with Binutils:
 414          * elfcopy checks the FreeBSD OSABI tag to tell whether it needs to
 415          * move the section headers, while Binutils is probably configured
 416          * this way when it's compiled on FreeBSD.
 417          */
 418         if (oeh.e_ident[EI_OSABI] == ELFOSABI_FREEBSD)
 419                 shtab = insert_shtab(ecp, 1);
 420         else
 421                 shtab = insert_shtab(ecp, 0);
 422
 423         /*
 424          * Resync section offsets in the output object. This is needed
 425          * because probably sections are modified or new sections are added,
 426          * as a result overlap/gap might appears.
 427          */
 428         resync_sections(ecp);
 429
 430         /* Store SHDR offset in EHDR. */
 431         oeh.e_shoff = shtab->off;
 432
 433         /* Put program header table immediately after the Elf header. */
 434         if (ecp->ophnum > 0) {
 435                 oeh.e_phoff = gelf_fsize(ecp->eout, ELF_T_EHDR, 1, EV_CURRENT);
 436                 if (oeh.e_phoff == 0)
 437                         errx(EXIT_FAILURE, "gelf_fsize() failed: %s",
 438                             elf_errmsg(-1));
 439         }
 440
 441         /*
 442          * Update ELF object entry point if requested.
 443          */
 444         if (ecp->change_addr != 0)
 445                 oeh.e_entry += ecp->change_addr;
 446         if (ecp->flags & SET_START)
 447                 oeh.e_entry = ecp->set_start;
 448         if (ecp->change_start != 0)
 449                 oeh.e_entry += ecp->change_start;
 450
 451         /*
 452          * Update ehdr again before we call elf_update(), since we
 453          * modified e_shoff and e_phoff.
 454          */
 455         if (gelf_update_ehdr(ecp->eout, &oeh) == 0)
 456                 errx(EXIT_FAILURE, "gelf_update_ehdr() failed: %s",
 457                     elf_errmsg(-1));
 458
 459         if (ecp->ophnum > 0)
 460                 copy_phdr(ecp);
 461
 462         /* Write out the output elf object. */
 463         if (elf_update(ecp->eout, ELF_C_WRITE) < 0)
 464                 errx(EXIT_FAILURE, "elf_update() failed: %s",
 465                     elf_errmsg(-1));
 466
 467         /* Release allocated resource. */
 468         free_elf(ecp);
 469 }
 470
 471 void
 472 free_elf(struct elfcopy *ecp)
 473 {
 474         struct segment  *seg, *seg_temp;
 475         struct section  *sec, *sec_temp;
 476
 477         /* Free internal segment list. */
 478         if (!STAILQ_EMPTY(&ecp->v_seg)) {
 479                 STAILQ_FOREACH_SAFE(seg, &ecp->v_seg, seg_list, seg_temp) {
 480                         STAILQ_REMOVE(&ecp->v_seg, seg, segment, seg_list);
 481                         free(seg);
 482                 }
 483         }
 484
 485         /* Free symbol table buffers. */
 486         free_symtab(ecp);
 487
 488         /* Free internal section list. */
 489         if (!TAILQ_EMPTY(&ecp->v_sec)) {
 490                 TAILQ_FOREACH_SAFE(sec, &ecp->v_sec, sec_list, sec_temp) {
 491                         TAILQ_REMOVE(&ecp->v_sec, sec, sec_list);
 492                         if (sec->buf != NULL)
 493                                 free(sec->buf);
 494                         if (sec->newname != NULL)
 495                                 free(sec->newname);
 496                         if (sec->pad != NULL)
 497                                 free(sec->pad);
 498                         free(sec);
 499                 }
 500         }
 501
 502         if (ecp->secndx != NULL) {
 503                 free(ecp->secndx);
 504                 ecp->secndx = NULL;
 505         }
 506 }
 507
 508 /* Create a temporary file. */
 509 void
 510 create_tempfile(char **fn, int *fd)
 511 {
 512         const char      *tmpdir;
 513         char            *cp, *tmpf;
 514         size_t           tlen, plen;
 515
 516 #define _TEMPFILE "ecp.XXXXXXXX"
 517 #define _TEMPFILEPATH "/tmp/ecp.XXXXXXXX"
 518
 519         if (fn == NULL || fd == NULL)
 520                 return;
 521         /* Repect TMPDIR environment variable. */
 522         tmpdir = getenv("TMPDIR");
 523         if (tmpdir != NULL && *tmpdir != '\0') {
 524                 tlen = strlen(tmpdir);
 525                 plen = strlen(_TEMPFILE);
 526                 tmpf = malloc(tlen + plen + 2);
 527                 if (tmpf == NULL)
 528                         err(EXIT_FAILURE, "malloc failed");
 529                 strncpy(tmpf, tmpdir, tlen);
 530                 cp = &tmpf[tlen - 1];
 531                 if (*cp++ != '/')
 532                         *cp++ = '/';
 533                 strncpy(cp, _TEMPFILE, plen);
 534                 cp[plen] = '\0';
 535         } else {
 536                 tmpf = strdup(_TEMPFILEPATH);
 537                 if (tmpf == NULL)
 538                         err(EXIT_FAILURE, "strdup failed");
 539         }
 540         if ((*fd = mkstemp(tmpf)) == -1)
 541                 err(EXIT_FAILURE, "mkstemp %s failed", tmpf);
 542         if (fchmod(*fd, 0644) == -1)
 543                 err(EXIT_FAILURE, "fchmod %s failed", tmpf);
 544         *fn = tmpf;
 545
 546 #undef _TEMPFILE
 547 #undef _TEMPFILEPATH
 548 }
 549
 550 /*
 551  * Copy temporary file with path src and file descriptor infd to path dst.
 552  * If in_place is set act as if editing the file in place, avoiding rename()
 553  * to preserve hard and symbolic links. Output file remains open, with file
 554  * descriptor returned in outfd.
 555  */
 556 static int
 557 copy_from_tempfile(const char *src, const char *dst, int infd, int *outfd,
 558     int in_place)
 559 {
 560         int tmpfd;
 561
 562         /*
 563          * First, check if we can use rename().
 564          */
 565         if (in_place == 0) {
 566                 if (rename(src, dst) >= 0) {
 567                         *outfd = infd;
 568                         return (0);
 569                 } else if (errno != EXDEV)
 570                         return (-1);
 571
 572                 /*
 573                  * If the rename() failed due to 'src' and 'dst' residing in
 574                  * two different file systems, invoke a helper function in
 575                  * libelftc to do the copy.
 576                  */
 577
 578                 if (unlink(dst) < 0)
 579                         return (-1);
 580         }
 581
 582         if ((tmpfd = open(dst, O_CREAT | O_TRUNC | O_WRONLY, 0755)) < 0)
 583                 return (-1);
 584
 585         if (elftc_copyfile(infd, tmpfd) < 0)
 586                 return (-1);
 587
 588         /*
 589          * Remove the temporary file from the file system
 590          * namespace, and close its file descriptor.
 591          */
 592         if (unlink(src) < 0)
 593                 return (-1);
 594
 595         (void) close(infd);
 596
 597         /*
 598          * Return the file descriptor for the destination.
 599          */
 600         *outfd = tmpfd;
 601
 602         return (0);
 603 }
 604
 605 static void
 606 create_file(struct elfcopy *ecp, const char *src, const char *dst)
 607 {
 608         struct stat      sb;
 609         char            *tempfile, *elftemp;
 610         int              efd, ifd, ofd, ofd0, tfd;
 611         int              in_place;
 612
 613         tempfile = NULL;
 614
 615         if (src == NULL)
 616                 errx(EXIT_FAILURE, "internal: src == NULL");
 617         if ((ifd = open(src, O_RDONLY)) == -1)
 618                 err(EXIT_FAILURE, "open %s failed", src);
 619
 620         if (fstat(ifd, &sb) == -1)
 621                 err(EXIT_FAILURE, "fstat %s failed", src);
 622
 623         if (dst == NULL)
 624                 create_tempfile(&tempfile, &ofd);
 625         else
 626                 if ((ofd = open(dst, O_RDWR|O_CREAT, 0755)) == -1)
 627                         err(EXIT_FAILURE, "open %s failed", dst);
 628
 629 #ifndef LIBELF_AR
 630         /* Detect and process ar(1) archive using libarchive. */
 631         if (ac_detect_ar(ifd)) {
 632                 ac_create_ar(ecp, ifd, ofd);
 633                 goto copy_done;
 634         }
 635 #endif
 636
 637         if (lseek(ifd, 0, SEEK_SET) < 0)
 638                 err(EXIT_FAILURE, "lseek failed");
 639
 640         /*
 641          * If input object is not ELF file, convert it to an intermediate
 642          * ELF object before processing.
 643          */
 644         if (ecp->itf != ETF_ELF) {
 645                 /*
 646                  * If the output object is not an ELF file, choose an arbitrary
 647                  * ELF format for the intermediate file. srec, ihex and binary
 648                  * formats are independent of class, endianness and machine
 649                  * type so these choices do not affect the output.
 650                  */
 651                 if (ecp->otf != ETF_ELF) {
 652                         if (ecp->oec == ELFCLASSNONE)
 653                                 ecp->oec = ELFCLASS64;
 654                         if (ecp->oed == ELFDATANONE)
 655                                 ecp->oed = ELFDATA2LSB;
 656                 }
 657                 create_tempfile(&elftemp, &efd);
 658                 if ((ecp->eout = elf_begin(efd, ELF_C_WRITE, NULL)) == NULL)
 659                         errx(EXIT_FAILURE, "elf_begin() failed: %s",
 660                             elf_errmsg(-1));
 661                 elf_flagelf(ecp->eout, ELF_C_SET, ELF_F_LAYOUT);
 662                 if (ecp->itf == ETF_BINARY)
 663                         create_elf_from_binary(ecp, ifd, src);
 664                 else if (ecp->itf == ETF_IHEX)
 665                         create_elf_from_ihex(ecp, ifd);
 666                 else if (ecp->itf == ETF_SREC)
 667                         create_elf_from_srec(ecp, ifd);
 668                 else
 669                         errx(EXIT_FAILURE, "Internal: invalid target flavour");
 670                 elf_end(ecp->eout);
 671
 672                 /* Open intermediate ELF object as new input object. */
 673                 close(ifd);
 674                 if ((ifd = open(elftemp, O_RDONLY)) == -1)
 675                         err(EXIT_FAILURE, "open %s failed", src);
 676                 close(efd);
 677                 free(elftemp);
 678         }
 679
 680         if ((ecp->ein = elf_begin(ifd, ELF_C_READ, NULL)) == NULL)
 681                 errx(EXIT_FAILURE, "elf_begin() failed: %s",
 682                     elf_errmsg(-1));
 683
 684         switch (elf_kind(ecp->ein)) {
 685         case ELF_K_NONE:
 686                 errx(EXIT_FAILURE, "file format not recognized");
 687         case ELF_K_ELF:
 688                 if ((ecp->eout = elf_begin(ofd, ELF_C_WRITE, NULL)) == NULL)
 689                         errx(EXIT_FAILURE, "elf_begin() failed: %s",
 690                             elf_errmsg(-1));
 691
 692                 /* elfcopy(1) manage ELF layout by itself. */
 693                 elf_flagelf(ecp->eout, ELF_C_SET, ELF_F_LAYOUT);
 694
 695                 /*
 696                  * Create output ELF object.
 697                  */
 698                 create_elf(ecp);
 699                 elf_end(ecp->eout);
 700
 701                 /*
 702                  * Convert the output ELF object to binary/srec/ihex if need.
 703                  */
 704                 if (ecp->otf != ETF_ELF) {
 705                         /*
 706                          * Create (another) tempfile for binary/srec/ihex
 707                          * output object.
 708                          */
 709                         if (tempfile != NULL) {
 710                                 if (unlink(tempfile) < 0)
 711                                         err(EXIT_FAILURE, "unlink %s failed",
 712                                             tempfile);
 713                                 free(tempfile);
 714                         }
 715                         create_tempfile(&tempfile, &ofd0);
 716
 717
 718                         /*
 719                          * Rewind the file descriptor being processed.
 720                          */
 721                         if (lseek(ofd, 0, SEEK_SET) < 0)
 722                                 err(EXIT_FAILURE,
 723                                     "lseek failed for the output object");
 724
 725                         /*
 726                          * Call flavour-specific conversion routine.
 727                          */
 728                         switch (ecp->otf) {
 729                         case ETF_BINARY:
 730                                 create_binary(ofd, ofd0);
 731                                 break;
 732                         case ETF_IHEX:
 733                                 create_ihex(ofd, ofd0);
 734                                 break;
 735                         case ETF_SREC:
 736                                 create_srec(ecp, ofd, ofd0,
 737                                     dst != NULL ? dst : src);
 738                                 break;
 739                         case ETF_PE:
 740                         case ETF_EFI:
 741 #if     WITH_PE
 742                                 create_pe(ecp, ofd, ofd0);
 743 #else
 744                                 errx(EXIT_FAILURE, "PE/EFI support not enabled"
 745                                     " at compile time");
 746 #endif
 747                                 break;
 748                         default:
 749                                 errx(EXIT_FAILURE, "Internal: unsupported"
 750                                     " output flavour %d", ecp->oec);
 751                         }
 752
 753                         close(ofd);
 754                         ofd = ofd0;
 755                 }
 756
 757                 break;
 758
 759         case ELF_K_AR:
 760                 /* XXX: Not yet supported. */
 761                 break;
 762         default:
 763                 errx(EXIT_FAILURE, "file format not supported");
 764         }
 765
 766         elf_end(ecp->ein);
 767
 768 #ifndef LIBELF_AR
 769 copy_done:
 770 #endif
 771
 772         if (tempfile != NULL) {
 773                 in_place = 0;
 774                 if (dst == NULL) {
 775                         dst = src;
 776                         if (lstat(dst, &sb) != -1 &&
 777                             (sb.st_nlink > 1 || S_ISLNK(sb.st_mode)))
 778                                 in_place = 1;
 779                 }
 780
 781                 if (copy_from_tempfile(tempfile, dst, ofd, &tfd, in_place) < 0)
 782                         err(EXIT_FAILURE, "creation of %s failed", dst);
 783
 784                 free(tempfile);
 785                 tempfile = NULL;
 786
 787                 ofd = tfd;
 788         }
 789
 790         if (strcmp(dst, "/dev/null") && fchmod(ofd, sb.st_mode) == -1)
 791                 err(EXIT_FAILURE, "fchmod %s failed", dst);
 792
 793         if ((ecp->flags & PRESERVE_DATE) &&
 794             elftc_set_timestamps(dst, &sb) < 0)
 795                 err(EXIT_FAILURE, "setting timestamps failed");
 796
 797         close(ifd);
 798         close(ofd);
 799 }
 800
 801 static void
 802 elfcopy_main(struct elfcopy *ecp, int argc, char **argv)
 803 {
 804         struct sec_action       *sac;
 805         const char              *infile, *outfile;
 806         char                    *fn, *s;
 807         int                      opt;
 808
 809         while ((opt = getopt_long(argc, argv, "dB:gG:I:j:K:L:N:O:pR:s:SwW:xXV",
 810             elfcopy_longopts, NULL)) != -1) {
 811                 switch(opt) {
 812                 case 'B':
 813                         /* ignored */
 814                         break;
 815                 case 'R':
 816                         sac = lookup_sec_act(ecp, optarg, 1);
 817                         if (sac->copy != 0)
 818                                 errx(EXIT_FAILURE,
 819                                     "both copy and remove specified");
 820                         sac->remove = 1;
 821                         ecp->flags |= SEC_REMOVE;
 822                         break;
 823                 case 'S':
 824                         ecp->strip = STRIP_ALL;
 825                         break;
 826                 case 'g':
 827                         ecp->strip = STRIP_DEBUG;
 828                         break;
 829                 case 'G':
 830                         ecp->flags |= KEEP_GLOBAL;
 831                         add_to_symop_list(ecp, optarg, NULL, SYMOP_KEEPG);
 832                         break;
 833                 case 'I':
 834                 case 's':
 835                         set_input_target(ecp, optarg);
 836                         break;
 837                 case 'j':
 838                         sac = lookup_sec_act(ecp, optarg, 1);
 839                         if (sac->remove != 0)
 840                                 errx(EXIT_FAILURE,
 841                                     "both copy and remove specified");
 842                         sac->copy = 1;
 843                         ecp->flags |= SEC_COPY;
 844                         break;
 845                 case 'K':
 846                         add_to_symop_list(ecp, optarg, NULL, SYMOP_KEEP);
 847                         break;
 848                 case 'L':
 849                         add_to_symop_list(ecp, optarg, NULL, SYMOP_LOCALIZE);
 850                         break;
 851                 case 'N':
 852                         add_to_symop_list(ecp, optarg, NULL, SYMOP_STRIP);
 853                         break;
 854                 case 'O':
 855                         set_output_target(ecp, optarg);
 856                         break;
 857                 case 'p':
 858                         ecp->flags |= PRESERVE_DATE;
 859                         break;
 860                 case 'V':
 861                         print_version();
 862                         break;
 863                 case 'w':
 864                         ecp->flags |= WILDCARD;
 865                         break;
 866                 case 'W':
 867                         add_to_symop_list(ecp, optarg, NULL, SYMOP_WEAKEN);
 868                         break;
 869                 case 'x':
 870                         ecp->flags |= DISCARD_LOCAL;
 871                         break;
 872                 case 'X':
 873                         ecp->flags |= DISCARD_LLABEL;
 874                         break;
 875                 case ECP_ADD_GNU_DEBUGLINK:
 876                         ecp->debuglink = optarg;
 877                         break;
 878                 case ECP_ADD_SECTION:
 879                         add_section(ecp, optarg);
 880                         break;
 881                 case ECP_CHANGE_ADDR:
 882                         ecp->change_addr = (int64_t) strtoll(optarg, NULL, 0);
 883                         break;
 884                 case ECP_CHANGE_SEC_ADDR:
 885                         parse_sec_address_op(ecp, opt, "--change-section-addr",
 886                             optarg);
 887                         break;
 888                 case ECP_CHANGE_SEC_LMA:
 889                         parse_sec_address_op(ecp, opt, "--change-section-lma",
 890                             optarg);
 891                         break;
 892                 case ECP_CHANGE_SEC_VMA:
 893                         parse_sec_address_op(ecp, opt, "--change-section-vma",
 894                             optarg);
 895                         break;
 896                 case ECP_CHANGE_START:
 897                         ecp->change_start = (int64_t) strtoll(optarg, NULL, 0);
 898                         break;
 899                 case ECP_CHANGE_WARN:
 900                         /* default */
 901                         break;
 902                 case ECP_GAP_FILL:
 903                         ecp->fill = (uint8_t) strtoul(optarg, NULL, 0);
 904                         ecp->flags |= GAP_FILL;
 905                         break;
 906                 case ECP_GLOBALIZE_SYMBOL:
 907                         add_to_symop_list(ecp, optarg, NULL, SYMOP_GLOBALIZE);
 908                         break;
 909                 case ECP_GLOBALIZE_SYMBOLS:
 910                         parse_symlist_file(ecp, optarg, SYMOP_GLOBALIZE);
 911                         break;
 912                 case ECP_KEEP_SYMBOLS:
 913                         parse_symlist_file(ecp, optarg, SYMOP_KEEP);
 914                         break;
 915                 case ECP_KEEP_GLOBAL_SYMBOLS:
 916                         parse_symlist_file(ecp, optarg, SYMOP_KEEPG);
 917                         break;
 918                 case ECP_LOCALIZE_HIDDEN:
 919                         ecp->flags |= LOCALIZE_HIDDEN;
 920                         break;
 921                 case ECP_LOCALIZE_SYMBOLS:
 922                         parse_symlist_file(ecp, optarg, SYMOP_LOCALIZE);
 923                         break;
 924                 case ECP_NO_CHANGE_WARN:
 925                         ecp->flags |= NO_CHANGE_WARN;
 926                         break;
 927                 case ECP_ONLY_DEBUG:
 928                         ecp->strip = STRIP_NONDEBUG;
 929                         break;
 930                 case ECP_ONLY_DWO:
 931                         ecp->strip = STRIP_NONDWO;
 932                         break;
 933                 case ECP_PAD_TO:
 934                         ecp->pad_to = (uint64_t) strtoull(optarg, NULL, 0);
 935                         break;
 936                 case ECP_PREFIX_ALLOC:
 937                         ecp->prefix_alloc = optarg;
 938                         break;
 939                 case ECP_PREFIX_SEC:
 940                         ecp->prefix_sec = optarg;
 941                         break;
 942                 case ECP_PREFIX_SYM:
 943                         ecp->prefix_sym = optarg;
 944                         break;
 945                 case ECP_REDEF_SYMBOL:
 946                         if ((s = strchr(optarg, '=')) == NULL)
 947                                 errx(EXIT_FAILURE,
 948                                     "illegal format for --redefine-sym");
 949                         *s++ = '\0';
 950                         add_to_symop_list(ecp, optarg, s, SYMOP_REDEF);
 951                         break;
 952                 case ECP_REDEF_SYMBOLS:
 953                         parse_symlist_file(ecp, optarg, SYMOP_REDEF);
 954                         break;
 955                 case ECP_RENAME_SECTION:
 956                         if ((fn = strchr(optarg, '=')) == NULL)
 957                                 errx(EXIT_FAILURE,
 958                                     "illegal format for --rename-section");
 959                         *fn++ = '\0';
 960
 961                         /* Check for optional flags. */
 962                         if ((s = strchr(fn, ',')) != NULL)
 963                                 *s++ = '\0';
 964
 965                         sac = lookup_sec_act(ecp, optarg, 1);
 966                         sac->rename = 1;
 967                         sac->newname = fn;
 968                         if (s != NULL)
 969                                 parse_sec_flags(sac, s);
 970                         break;
 971                 case ECP_SET_OSABI:
 972                         set_osabi(ecp, optarg);
 973                         break;
 974                 case ECP_SET_SEC_FLAGS:
 975                         if ((s = strchr(optarg, '=')) == NULL)
 976                                 errx(EXIT_FAILURE,
 977                                     "illegal format for --set-section-flags");
 978                         *s++ = '\0';
 979                         sac = lookup_sec_act(ecp, optarg, 1);
 980                         parse_sec_flags(sac, s);
 981                         break;
 982                 case ECP_SET_START:
 983                         ecp->flags |= SET_START;
 984                         ecp->set_start = (uint64_t) strtoull(optarg, NULL, 0);
 985                         break;
 986                 case ECP_SREC_FORCE_S3:
 987                         ecp->flags |= SREC_FORCE_S3;
 988                         break;
 989                 case ECP_SREC_LEN:
 990                         ecp->flags |= SREC_FORCE_LEN;
 991                         ecp->srec_len = strtoul(optarg, NULL, 0);
 992                         break;
 993                 case ECP_STRIP_DWO:
 994                         ecp->strip = STRIP_DWO;
 995                         break;
 996                 case ECP_STRIP_SYMBOLS:
 997                         parse_symlist_file(ecp, optarg, SYMOP_STRIP);
 998                         break;
 999                 case ECP_STRIP_UNNEEDED:
1000                         ecp->strip = STRIP_UNNEEDED;
1001                         break;
1002                 case ECP_WEAKEN_ALL:
1003                         ecp->flags |= WEAKEN_ALL;
1004                         break;
1005                 case ECP_WEAKEN_SYMBOLS:
1006                         parse_symlist_file(ecp, optarg, SYMOP_WEAKEN);
1007                         break;
1008                 default:
1009                         elfcopy_usage();
1010                 }
1011         }
1012
1013         if (optind == argc || optind + 2 < argc)
1014                 elfcopy_usage();
1015
1016         infile = argv[optind];
1017         outfile = NULL;
1018         if (optind + 1 < argc)
1019                 outfile = argv[optind + 1];
1020
1021         create_file(ecp, infile, outfile);
1022 }
1023
1024 static void
1025 mcs_main(struct elfcopy *ecp, int argc, char **argv)
1026 {
1027         struct sec_action       *sac;
1028         const char              *string;
1029         int                      append, delete, compress, name, print;
1030         int                      opt, i;
1031
1032         append = delete = compress = name = print = 0;
1033         string = NULL;
1034         while ((opt = getopt_long(argc, argv, "a:cdhn:pV", mcs_longopts,
1035                 NULL)) != -1) {
1036                 switch(opt) {
1037                 case 'a':
1038                         append = 1;
1039                         string = optarg; /* XXX multiple -a not supported */
1040                         break;
1041                 case 'c':
1042                         compress = 1;
1043                         break;
1044                 case 'd':
1045                         delete = 1;
1046                         break;
1047                 case 'n':
1048                         name = 1;
1049                         (void)lookup_sec_act(ecp, optarg, 1);
1050                         break;
1051                 case 'p':
1052                         print = 1;
1053                         break;
1054                 case 'V':
1055                         print_version();
1056                         break;
1057                 case 'h':
1058                 default:
1059                         mcs_usage();
1060                 }
1061         }
1062
1063         if (optind == argc)
1064                 mcs_usage();
1065
1066         /* Must specify one operation at least. */
1067         if (!append && !compress && !delete && !print)
1068                 mcs_usage();
1069
1070         /*
1071          * If we are going to delete, ignore other operations. This is
1072          * different from the Solaris implementation, which can print
1073          * and delete a section at the same time, for example. Also, this
1074          * implementation do not respect the order between operations that
1075          * user specified, i.e., "mcs -pc a.out" equals to "mcs -cp a.out".
1076          */
1077         if (delete) {
1078                 append = compress = print = 0;
1079                 ecp->flags |= SEC_REMOVE;
1080         }
1081         if (append)
1082                 ecp->flags |= SEC_APPEND;
1083         if (compress)
1084                 ecp->flags |= SEC_COMPRESS;
1085         if (print)
1086                 ecp->flags |= SEC_PRINT;
1087
1088         /* .comment is the default section to operate on. */
1089         if (!name)
1090                 (void)lookup_sec_act(ecp, ".comment", 1);
1091
1092         STAILQ_FOREACH(sac, &ecp->v_sac, sac_list) {
1093                 sac->append = append;
1094                 sac->compress = compress;
1095                 sac->print = print;
1096                 sac->remove = delete;
1097                 sac->string = string;
1098         }
1099
1100         for (i = optind; i < argc; i++) {
1101                 /* If only -p is specified, output to /dev/null */
1102                 if (print && !append && !compress && !delete)
1103                         create_file(ecp, argv[i], "/dev/null");
1104                 else
1105                         create_file(ecp, argv[i], NULL);
1106         }
1107 }
1108
1109 static void
1110 strip_main(struct elfcopy *ecp, int argc, char **argv)
1111 {
1112         struct sec_action       *sac;
1113         const char              *outfile;
1114         int                      opt;
1115         int                      i;
1116
1117         outfile = NULL;
1118         while ((opt = getopt_long(argc, argv, "hI:K:N:o:O:pR:sSdgVxXw",
1119             strip_longopts, NULL)) != -1) {
1120                 switch(opt) {
1121                 case 'R':
1122                         sac = lookup_sec_act(ecp, optarg, 1);
1123                         sac->remove = 1;
1124                         ecp->flags |= SEC_REMOVE;
1125                         break;
1126                 case 's':
1127                         ecp->strip = STRIP_ALL;
1128                         break;
1129                 case 'S':
1130                 case 'g':
1131                 case 'd':
1132                         ecp->strip = STRIP_DEBUG;
1133                         break;
1134                 case 'I':
1135                         /* ignored */
1136                         break;
1137                 case 'K':
1138                         add_to_symop_list(ecp, optarg, NULL, SYMOP_KEEP);
1139                         break;
1140                 case 'N':
1141                         add_to_symop_list(ecp, optarg, NULL, SYMOP_STRIP);
1142                         break;
1143                 case 'o':
1144                         outfile = optarg;
1145                         break;
1146                 case 'O':
1147                         set_output_target(ecp, optarg);
1148                         break;
1149                 case 'p':
1150                         ecp->flags |= PRESERVE_DATE;
1151                         break;
1152                 case 'V':
1153                         print_version();
1154                         break;
1155                 case 'w':
1156                         ecp->flags |= WILDCARD;
1157                         break;
1158                 case 'x':
1159                         ecp->flags |= DISCARD_LOCAL;
1160                         break;
1161                 case 'X':
1162                         ecp->flags |= DISCARD_LLABEL;
1163                         break;
1164                 case ECP_ONLY_DEBUG:
1165                         ecp->strip = STRIP_NONDEBUG;
1166                         break;
1167                 case ECP_STRIP_UNNEEDED:
1168                         ecp->strip = STRIP_UNNEEDED;
1169                         break;
1170                 case 'h':
1171                 default:
1172                         strip_usage();
1173                 }
1174         }
1175
1176         if (ecp->strip == 0 &&
1177             ((ecp->flags & DISCARD_LOCAL) == 0) &&
1178             ((ecp->flags & DISCARD_LLABEL) == 0) &&
1179             lookup_symop_list(ecp, NULL, SYMOP_STRIP) == NULL)
1180                 ecp->strip = STRIP_ALL;
1181         if (optind == argc)
1182                 strip_usage();
1183
1184         for (i = optind; i < argc; i++)
1185                 create_file(ecp, argv[i], outfile);
1186 }
1187
1188 static void
1189 parse_sec_flags(struct sec_action *sac, char *s)
1190 {
1191         const char      *flag;
1192         int              found, i;
1193
1194         for (flag = strtok(s, ","); flag; flag = strtok(NULL, ",")) {
1195                 found = 0;
1196                 for (i = 0; sec_flags[i].name != NULL; i++)
1197                         if (strcasecmp(sec_flags[i].name, flag) == 0) {
1198                                 sac->flags |= sec_flags[i].value;
1199                                 found = 1;
1200                                 break;
1201                         }
1202                 if (!found)
1203                         errx(EXIT_FAILURE, "unrecognized section flag %s",
1204                             flag);
1205         }
1206 }
1207
1208 static void
1209 parse_sec_address_op(struct elfcopy *ecp, int optnum, const char *optname,
1210     char *s)
1211 {
1212         struct sec_action       *sac;
1213         const char              *name;
1214         char                    *v;
1215         char                     op;
1216
1217         name = v = s;
1218         do {
1219                 v++;
1220         } while (*v != '\0' && *v != '=' && *v != '+' && *v != '-');
1221         if (*v == '\0' || *(v + 1) == '\0')
1222                 errx(EXIT_FAILURE, "invalid format for %s", optname);
1223         op = *v;
1224         *v++ = '\0';
1225         sac = lookup_sec_act(ecp, name, 1);
1226         switch (op) {
1227         case '=':
1228                 if (optnum == ECP_CHANGE_SEC_LMA ||
1229                     optnum == ECP_CHANGE_SEC_ADDR) {
1230                         sac->setlma = 1;
1231                         sac->lma = (uint64_t) strtoull(v, NULL, 0);
1232                 }
1233                 if (optnum == ECP_CHANGE_SEC_VMA ||
1234                     optnum == ECP_CHANGE_SEC_ADDR) {
1235                         sac->setvma = 1;
1236                         sac->vma = (uint64_t) strtoull(v, NULL, 0);
1237                 }
1238                 break;
1239         case '+':
1240                 if (optnum == ECP_CHANGE_SEC_LMA ||
1241                     optnum == ECP_CHANGE_SEC_ADDR)
1242                         sac->lma_adjust = (int64_t) strtoll(v, NULL, 0);
1243                 if (optnum == ECP_CHANGE_SEC_VMA ||
1244                     optnum == ECP_CHANGE_SEC_ADDR)
1245                         sac->vma_adjust = (int64_t) strtoll(v, NULL, 0);
1246                 break;
1247         case '-':
1248                 if (optnum == ECP_CHANGE_SEC_LMA ||
1249                     optnum == ECP_CHANGE_SEC_ADDR)
1250                         sac->lma_adjust = (int64_t) -strtoll(v, NULL, 0);
1251                 if (optnum == ECP_CHANGE_SEC_VMA ||
1252                     optnum == ECP_CHANGE_SEC_ADDR)
1253                         sac->vma_adjust = (int64_t) -strtoll(v, NULL, 0);
1254                 break;
1255         default:
1256                 break;
1257         }
1258 }
1259
1260 static void
1261 parse_symlist_file(struct elfcopy *ecp, const char *fn, unsigned int op)
1262 {
1263         struct symfile  *sf;
1264         struct stat      sb;
1265         FILE            *fp;
1266         char            *data, *p, *line, *end, *e, *n;
1267
1268         if (stat(fn, &sb) == -1)
1269                 err(EXIT_FAILURE, "stat %s failed", fn);
1270
1271         /* Check if we already read and processed this file. */
1272         STAILQ_FOREACH(sf, &ecp->v_symfile, symfile_list) {
1273                 if (sf->dev == sb.st_dev && sf->ino == sb.st_ino)
1274                         goto process_symfile;
1275         }
1276
1277         if ((fp = fopen(fn, "r")) == NULL)
1278                 err(EXIT_FAILURE, "can not open %s", fn);
1279         if ((data = malloc(sb.st_size + 1)) == NULL)
1280                 err(EXIT_FAILURE, "malloc failed");
1281         if (fread(data, 1, sb.st_size, fp) == 0 || ferror(fp))
1282                 err(EXIT_FAILURE, "fread failed");
1283         fclose(fp);
1284         data[sb.st_size] = '\0';
1285
1286         if ((sf = calloc(1, sizeof(*sf))) == NULL)
1287                 err(EXIT_FAILURE, "malloc failed");
1288         sf->dev = sb.st_dev;
1289         sf->ino = sb.st_ino;
1290         sf->size = sb.st_size + 1;
1291         sf->data = data;
1292
1293 process_symfile:
1294
1295         /*
1296          * Basically what we do here is to convert EOL to '\0', and remove
1297          * leading and trailing whitespaces for each line.
1298          */
1299
1300         end = sf->data + sf->size;
1301         line = NULL;
1302         for(p = sf->data; p < end; p++) {
1303                 if ((*p == '\t' || *p == ' ') && line == NULL)
1304                         continue;
1305                 if (*p == '\r' || *p == '\n' || *p == '\0') {
1306                         *p = '\0';
1307                         if (line == NULL)
1308                                 continue;
1309
1310                         /* Skip comment. */
1311                         if (*line == '#') {
1312                                 line = NULL;
1313                                 continue;
1314                         }
1315
1316                         e = p - 1;
1317                         while(e != line && (*e == '\t' || *e == ' '))
1318                                 *e-- = '\0';
1319                         if (op != SYMOP_REDEF)
1320                                 add_to_symop_list(ecp, line, NULL, op);
1321                         else {
1322                                 if (strlen(line) < 3)
1323                                         errx(EXIT_FAILURE,
1324                                             "illegal format for"
1325                                             " --redefine-sym");
1326                                 for(n = line + 1; n < e; n++) {
1327                                         if (*n == ' ' || *n == '\t') {
1328                                                 while(*n == ' ' || *n == '\t')
1329                                                         *n++ = '\0';
1330                                                 break;
1331                                         }
1332                                 }
1333                                 if (n >= e)
1334                                         errx(EXIT_FAILURE,
1335                                             "illegal format for"
1336                                             " --redefine-sym");
1337                                 add_to_symop_list(ecp, line, n, op);
1338                         }
1339                         line = NULL;
1340                         continue;
1341                 }
1342
1343                 if (line == NULL)
1344                         line = p;
1345         }
1346 }
1347
1348 static void
1349 set_input_target(struct elfcopy *ecp, const char *target_name)
1350 {
1351         Elftc_Bfd_Target *tgt;
1352
1353         if ((tgt = elftc_bfd_find_target(target_name)) == NULL)
1354                 errx(EXIT_FAILURE, "%s: invalid target name", target_name);
1355         ecp->itf = elftc_bfd_target_flavor(tgt);
1356 }
1357
1358 static void
1359 set_output_target(struct elfcopy *ecp, const char *target_name)
1360 {
1361         Elftc_Bfd_Target *tgt;
1362
1363         if ((tgt = elftc_bfd_find_target(target_name)) == NULL)
1364                 errx(EXIT_FAILURE, "%s: invalid target name", target_name);
1365         ecp->otf = elftc_bfd_target_flavor(tgt);
1366         if (ecp->otf == ETF_ELF) {
1367                 ecp->oec = elftc_bfd_target_class(tgt);
1368                 ecp->oed = elftc_bfd_target_byteorder(tgt);
1369                 ecp->oem = elftc_bfd_target_machine(tgt);
1370         }
1371         if (ecp->otf == ETF_EFI || ecp->otf == ETF_PE)
1372                 ecp->oem = elftc_bfd_target_machine(tgt);
1373
1374         ecp->otgt = target_name;
1375 }
1376
1377 static void
1378 set_osabi(struct elfcopy *ecp, const char *abi)
1379 {
1380         int i, found;
1381
1382         found = 0;
1383         for (i = 0; osabis[i].name != NULL; i++)
1384                 if (strcasecmp(osabis[i].name, abi) == 0) {
1385                         ecp->abi = osabis[i].abi;
1386                         found = 1;
1387                         break;
1388                 }
1389         if (!found)
1390                 errx(EXIT_FAILURE, "unrecognized OSABI %s", abi);
1391 }
1392
1393 #define ELFCOPY_USAGE_MESSAGE   "\
1394 Usage: %s [options] infile [outfile]\n\
1395   Transform object files.\n\n\
1396   Options:\n\
1397   -d | -g | --strip-debug      Remove debugging information from the output.\n\
1398   -j SECTION | --only-section=SECTION\n\
1399                                Copy only the named section to the output.\n\
1400   -p | --preserve-dates        Preserve access and modification times.\n\
1401   -w | --wildcard              Use shell-style patterns to name symbols.\n\
1402   -x | --discard-all           Do not copy non-globals to the output.\n\
1403   -I FORMAT | --input-target=FORMAT\n\
1404                                Specify object format for the input file.\n\
1405   -K SYM | --keep-symbol=SYM   Copy symbol SYM to the output.\n\
1406   -L SYM | --localize-symbol=SYM\n\
1407                                Make symbol SYM local to the output file.\n\
1408   -N SYM | --strip-symbol=SYM  Do not copy symbol SYM to the output.\n\
1409   -O FORMAT | --output-target=FORMAT\n\
1410                                Specify object format for the output file.\n\
1411                                FORMAT should be a target name understood by\n\
1412                                elftc_bfd_find_target(3).\n\
1413   -R NAME | --remove-section=NAME\n\
1414                                Remove the named section.\n\
1415   -S | --strip-all             Remove all symbol and relocation information\n\
1416                                from the output.\n\
1417   -V | --version               Print a version identifier and exit.\n\
1418   -W SYM | --weaken-symbol=SYM Mark symbol SYM as weak in the output.\n\
1419   -X | --discard-locals        Do not copy compiler generated symbols to\n\
1420                                the output.\n\
1421   --add-section NAME=FILE      Add the contents of FILE to the ELF object as\n\
1422                                a new section named NAME.\n\
1423   --adjust-section-vma SECTION{=,+,-}VAL | \\\n\
1424     --change-section-address SECTION{=,+,-}VAL\n\
1425                                Set or adjust the VMA and the LMA of the\n\
1426                                named section by VAL.\n\
1427   --adjust-start=INCR | --change-start=INCR\n\
1428                                Add INCR to the start address for the ELF\n\
1429                                object.\n\
1430   --adjust-vma=INCR | --change-addresses=INCR\n\
1431                                Increase the VMA and LMA of all sections by\n\
1432                                INCR.\n\
1433   --adjust-warning | --change-warnings\n\
1434                                Issue warnings for non-existent sections.\n\
1435   --change-section-lma SECTION{=,+,-}VAL\n\
1436                                Set or adjust the LMA address of the named\n\
1437                                section by VAL.\n\
1438   --change-section-vma SECTION{=,+,-}VAL\n\
1439                                Set or adjust the VMA address of the named\n\
1440                                section by VAL.\n\
1441   --gap-fill=VAL               Fill the gaps between sections with bytes\n\
1442                                of value VAL.\n\
1443   --localize-hidden            Make all hidden symbols local to the output\n\
1444                                file.\n\
1445   --no-adjust-warning| --no-change-warnings\n\
1446                                Do not issue warnings for non-existent\n\
1447                                sections.\n\
1448   --only-keep-debug            Copy only debugging information.\n\
1449   --output-target=FORMAT       Use the specified format for the output.\n\
1450   --pad-to=ADDRESS             Pad the output object up to the given address.\n\
1451   --prefix-alloc-sections=STRING\n\
1452                                Prefix the section names of all the allocated\n\
1453                                sections with STRING.\n\
1454   --prefix-sections=STRING     Prefix the section names of all the sections\n\
1455                                with STRING.\n\
1456   --prefix-symbols=STRING      Prefix the symbol names of all the symbols\n\
1457                                with STRING.\n\
1458   --rename-section OLDNAME=NEWNAME[,FLAGS]\n\
1459                                Rename and optionally change section flags.\n\
1460   --set-section-flags SECTION=FLAGS\n\
1461                                Set section flags for the named section.\n\
1462                                Supported flags are: 'alloc', 'code',\n\
1463                                'contents', 'data', 'debug', 'load',\n\
1464                                'noload', 'readonly', 'rom', and 'shared'.\n\
1465   --set-start=ADDRESS          Set the start address of the ELF object.\n\
1466   --srec-forceS3               Only generate S3 S-Records.\n\
1467   --srec-len=LEN               Set the maximum length of a S-Record line.\n\
1468   --strip-unneeded             Do not copy relocation information.\n"
1469
1470 static void
1471 elfcopy_usage(void)
1472 {
1473         (void) fprintf(stderr, ELFCOPY_USAGE_MESSAGE, ELFTC_GETPROGNAME());
1474         exit(EXIT_FAILURE);
1475 }
1476
1477 #define MCS_USAGE_MESSAGE       "\
1478 Usage: %s [options] file...\n\
1479   Manipulate the comment section in an ELF object.\n\n\
1480   Options:\n\
1481   -a STRING        Append 'STRING' to the comment section.\n\
1482   -c               Remove duplicate entries from the comment section.\n\
1483   -d               Delete the comment section.\n\
1484   -h | --help      Print a help message and exit.\n\
1485   -n NAME          Operate on the ELF section with name 'NAME'.\n\
1486   -p               Print the contents of the comment section.\n\
1487   -V | --version   Print a version identifier and exit.\n"
1488
1489 static void
1490 mcs_usage(void)
1491 {
1492         (void) fprintf(stderr, MCS_USAGE_MESSAGE, ELFTC_GETPROGNAME());
1493         exit(EXIT_FAILURE);
1494 }
1495
1496 #define STRIP_USAGE_MESSAGE     "\
1497 Usage: %s [options] file...\n\
1498   Discard information from ELF objects.\n\n\
1499   Options:\n\
1500   -d | -g | -S | --strip-debug    Remove debugging symbols.\n\
1501   -h | --help                     Print a help message.\n\
1502   -o FILE | --output-file FILE    Write output to FILE.\n\
1503   --only-keep-debug               Keep debugging information only.\n\
1504   -p | --preserve-dates           Preserve access and modification times.\n\
1505   -s | --strip-all                Remove all symbols.\n\
1506   --strip-unneeded                Remove symbols not needed for relocation\n\
1507                                   processing.\n\
1508   -w | --wildcard                 Use shell-style patterns to name symbols.\n\
1509   -x | --discard-all              Discard all non-global symbols.\n\
1510   -I TGT| --input-target=TGT      (Accepted, but ignored).\n\
1511   -K SYM | --keep-symbol=SYM      Keep symbol 'SYM' in the output.\n\
1512   -N SYM | --strip-symbol=SYM     Remove symbol 'SYM' from the output.\n\
1513   -O TGT | --output-target=TGT    Set the output file format to 'TGT'.\n\
1514   -R SEC | --remove-section=SEC   Remove the section named 'SEC'.\n\
1515   -V | --version                  Print a version identifier and exit.\n\
1516   -X | --discard-locals           Remove compiler-generated local symbols.\n"
1517
1518 static void
1519 strip_usage(void)
1520 {
1521         (void) fprintf(stderr, STRIP_USAGE_MESSAGE, ELFTC_GETPROGNAME());
1522         exit(EXIT_FAILURE);
1523 }
1524
1525 static void
1526 print_version(void)
1527 {
1528         (void) printf("%s (%s)\n", ELFTC_GETPROGNAME(), elftc_version());
1529         exit(EXIT_SUCCESS);
1530 }
1531
1532 int
1533 main(int argc, char **argv)
1534 {
1535         struct elfcopy *ecp;
1536
1537         if (elf_version(EV_CURRENT) == EV_NONE)
1538                 errx(EXIT_FAILURE, "ELF library initialization failed: %s",
1539                     elf_errmsg(-1));
1540
1541         ecp = calloc(1, sizeof(*ecp));
1542         if (ecp == NULL)
1543                 err(EXIT_FAILURE, "calloc failed");
1544         memset(ecp, 0, sizeof(*ecp));
1545
1546         ecp->itf = ecp->otf = ETF_ELF;
1547         ecp->iec = ecp->oec = ELFCLASSNONE;
1548         ecp->oed = ELFDATANONE;
1549         ecp->abi = -1;
1550         /* There is always an empty section. */
1551         ecp->nos = 1;
1552         ecp->fill = 0;
1553
1554         STAILQ_INIT(&ecp->v_seg);
1555         STAILQ_INIT(&ecp->v_sac);
1556         STAILQ_INIT(&ecp->v_sadd);
1557         STAILQ_INIT(&ecp->v_symop);
1558         STAILQ_INIT(&ecp->v_symfile);
1559         STAILQ_INIT(&ecp->v_arobj);
1560         TAILQ_INIT(&ecp->v_sec);
1561
1562         if ((ecp->progname = ELFTC_GETPROGNAME()) == NULL)
1563                 ecp->progname = "elfcopy";
1564
1565         if (strcmp(ecp->progname, "strip") == 0)
1566                 strip_main(ecp, argc, argv);
1567         else if (strcmp(ecp->progname, "mcs") == 0)
1568                 mcs_main(ecp, argc, argv);
1569         else
1570                 elfcopy_main(ecp, argc, argv);
1571
1572         free_sec_add(ecp);
1573         free_sec_act(ecp);
1574         free(ecp);
1575
1576         exit(EXIT_SUCCESS);
1577 }