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