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 3399 2016-02-12 18:07:56Z 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         {"arm", ELFOSABI_ARM},
 213         {"standalone", ELFOSABI_STANDALONE},
 214         {NULL, 0}
 215 };
 216
 217 static int      copy_from_tempfile(const char *src, const char *dst,
 218     int infd, int *outfd, int in_place);
 219 static void     create_file(struct elfcopy *ecp, const char *src,
 220     const char *dst);
 221 static void     elfcopy_main(struct elfcopy *ecp, int argc, char **argv);
 222 static void     elfcopy_usage(void);
 223 static void     mcs_main(struct elfcopy *ecp, int argc, char **argv);
 224 static void     mcs_usage(void);
 225 static void     parse_sec_address_op(struct elfcopy *ecp, int optnum,
 226     const char *optname, char *s);
 227 static void     parse_sec_flags(struct sec_action *sac, char *s);
 228 static void     parse_symlist_file(struct elfcopy *ecp, const char *fn,
 229     unsigned int op);
 230 static void     print_version(void);
 231 static void     set_input_target(struct elfcopy *ecp, const char *target_name);
 232 static void     set_osabi(struct elfcopy *ecp, const char *abi);
 233 static void     set_output_target(struct elfcopy *ecp, const char *target_name);
 234 static void     strip_main(struct elfcopy *ecp, int argc, char **argv);
 235 static void     strip_usage(void);
 236
 237 /*
 238  * An ELF object usually has a sturcture described by the
 239  * diagram below.
 240  *  _____________
 241  * |             |
 242  * |     NULL    | <- always a SHT_NULL section
 243  * |_____________|
 244  * |             |
 245  * |   .interp   |
 246  * |_____________|
 247  * |             |
 248  * |     ...     |
 249  * |_____________|
 250  * |             |
 251  * |    .text    |
 252  * |_____________|
 253  * |             |
 254  * |     ...     |
 255  * |_____________|
 256  * |             |
 257  * |  .comment   | <- above(include) this: normal sections
 258  * |_____________|
 259  * |             |
 260  * | add sections| <- unloadable sections added by --add-section
 261  * |_____________|
 262  * |             |
 263  * |  .shstrtab  | <- section name string table
 264  * |_____________|
 265  * |             |
 266  * |    shdrs    | <- section header table
 267  * |_____________|
 268  * |             |
 269  * |   .symtab   | <- symbol table, if any
 270  * |_____________|
 271  * |             |
 272  * |   .strtab   | <- symbol name string table, if any
 273  * |_____________|
 274  * |             |
 275  * |  .rel.text  | <- relocation info for .o files.
 276  * |_____________|
 277  */
 278 void
 279 create_elf(struct elfcopy *ecp)
 280 {
 281         struct section  *shtab;
 282         GElf_Ehdr        ieh;
 283         GElf_Ehdr        oeh;
 284         size_t           ishnum;
 285
 286         ecp->flags |= SYMTAB_INTACT;
 287
 288         /* Create EHDR. */
 289         if (gelf_getehdr(ecp->ein, &ieh) == NULL)
 290                 errx(EXIT_FAILURE, "gelf_getehdr() failed: %s",
 291                     elf_errmsg(-1));
 292         if ((ecp->iec = gelf_getclass(ecp->ein)) == ELFCLASSNONE)
 293                 errx(EXIT_FAILURE, "getclass() failed: %s",
 294                     elf_errmsg(-1));
 295
 296         if (ecp->oec == ELFCLASSNONE)
 297                 ecp->oec = ecp->iec;
 298         if (ecp->oed == ELFDATANONE)
 299                 ecp->oed = ieh.e_ident[EI_DATA];
 300
 301         if (gelf_newehdr(ecp->eout, ecp->oec) == NULL)
 302                 errx(EXIT_FAILURE, "gelf_newehdr failed: %s",
 303                     elf_errmsg(-1));
 304         if (gelf_getehdr(ecp->eout, &oeh) == NULL)
 305                 errx(EXIT_FAILURE, "gelf_getehdr() failed: %s",
 306                     elf_errmsg(-1));
 307
 308         memcpy(oeh.e_ident, ieh.e_ident, sizeof(ieh.e_ident));
 309         oeh.e_ident[EI_CLASS] = ecp->oec;
 310         oeh.e_ident[EI_DATA]  = ecp->oed;
 311         if (ecp->abi != -1)
 312                 oeh.e_ident[EI_OSABI] = ecp->abi;
 313         oeh.e_flags           = ieh.e_flags;
 314         oeh.e_machine         = ieh.e_machine;
 315         oeh.e_type            = ieh.e_type;
 316         oeh.e_entry           = ieh.e_entry;
 317         oeh.e_version         = ieh.e_version;
 318
 319         ecp->flags &= ~(EXECUTABLE | DYNAMIC | RELOCATABLE);
 320         if (ieh.e_type == ET_EXEC)
 321                 ecp->flags |= EXECUTABLE;
 322         else if (ieh.e_type == ET_DYN)
 323                 ecp->flags |= DYNAMIC;
 324         else if (ieh.e_type == ET_REL)
 325                 ecp->flags |= RELOCATABLE;
 326         else
 327                 errx(EXIT_FAILURE, "unsupported e_type");
 328
 329         if (!elf_getshnum(ecp->ein, &ishnum))
 330                 errx(EXIT_FAILURE, "elf_getshnum failed: %s",
 331                     elf_errmsg(-1));
 332         if (ishnum > 0 && (ecp->secndx = calloc(ishnum,
 333             sizeof(*ecp->secndx))) == NULL)
 334                 err(EXIT_FAILURE, "calloc failed");
 335
 336         /* Read input object program header. */
 337         setup_phdr(ecp);
 338
 339         /*
 340          * Scan of input sections: we iterate through sections from input
 341          * object, skip sections need to be stripped, allot Elf_Scn and
 342          * create internal section structure for sections we want.
 343          * (i.e., determine output sections)
 344          */
 345         create_scn(ecp);
 346
 347         /* Apply section address changes, if any. */
 348         adjust_addr(ecp);
 349
 350         /*
 351          * Determine if the symbol table needs to be changed based on
 352          * command line options.
 353          */
 354         if (ecp->strip == STRIP_DEBUG ||
 355             ecp->strip == STRIP_UNNEEDED ||
 356             ecp->flags & WEAKEN_ALL ||
 357             ecp->flags & LOCALIZE_HIDDEN ||
 358             ecp->flags & DISCARD_LOCAL ||
 359             ecp->flags & DISCARD_LLABEL ||
 360             ecp->prefix_sym != NULL ||
 361             !STAILQ_EMPTY(&ecp->v_symop))
 362                 ecp->flags &= ~SYMTAB_INTACT;
 363
 364         /*
 365          * Create symbol table. Symbols are filtered or stripped according to
 366          * command line args specified by user, and later updated for the new
 367          * layout of sections in the output object.
 368          */
 369         if ((ecp->flags & SYMTAB_EXIST) != 0)
 370                 create_symtab(ecp);
 371
 372         /*
 373          * First processing of output sections: at this stage we copy the
 374          * content of each section from input to output object.  Section
 375          * content will be modified and printed (mcs) if need. Also content of
 376          * relocation section probably will be filtered and updated according
 377          * to symbol table changes.
 378          */
 379         copy_content(ecp);
 380
 381         /*
 382          * Write the underlying ehdr. Note that it should be called
 383          * before elf_setshstrndx() since it will overwrite e->e_shstrndx.
 384          */
 385         if (gelf_update_ehdr(ecp->eout, &oeh) == 0)
 386                 errx(EXIT_FAILURE, "gelf_update_ehdr() failed: %s",
 387                     elf_errmsg(-1));
 388
 389         /* Generate section name string table (.shstrtab). */
 390         set_shstrtab(ecp);
 391
 392         /*
 393          * Second processing of output sections: Update section headers.
 394          * At this stage we set name string index, update st_link and st_info
 395          * for output sections.
 396          */
 397         update_shdr(ecp, 1);
 398
 399         /* Renew oeh to get the updated e_shstrndx. */
 400         if (gelf_getehdr(ecp->eout, &oeh) == NULL)
 401                 errx(EXIT_FAILURE, "gelf_getehdr() failed: %s",
 402                     elf_errmsg(-1));
 403
 404         /*
 405          * Insert SHDR table into the internal section list as a "pseudo"
 406          * section, so later it will get sorted and resynced just as "normal"
 407          * sections.
 408          *
 409          * Under FreeBSD, Binutils objcopy always put the section header
 410          * at the end of all the sections. We want to do the same here.
 411          *
 412          * However, note that the behaviour is still different with Binutils:
 413          * elfcopy checks the FreeBSD OSABI tag to tell whether it needs to
 414          * move the section headers, while Binutils is probably configured
 415          * this way when it's compiled on FreeBSD.
 416          */
 417         if (oeh.e_ident[EI_OSABI] == ELFOSABI_FREEBSD)
 418                 shtab = insert_shtab(ecp, 1);
 419         else
 420                 shtab = insert_shtab(ecp, 0);
 421
 422         /*
 423          * Resync section offsets in the output object. This is needed
 424          * because probably sections are modified or new sections are added,
 425          * as a result overlap/gap might appears.
 426          */
 427         resync_sections(ecp);
 428
 429         /* Store SHDR offset in EHDR. */
 430         oeh.e_shoff = shtab->off;
 431
 432         /* Put program header table immediately after the Elf header. */
 433         if (ecp->ophnum > 0) {
 434                 oeh.e_phoff = gelf_fsize(ecp->eout, ELF_T_EHDR, 1, EV_CURRENT);
 435                 if (oeh.e_phoff == 0)
 436                         errx(EXIT_FAILURE, "gelf_fsize() failed: %s",
 437                             elf_errmsg(-1));
 438         }
 439
 440         /*
 441          * Update ELF object entry point if requested.
 442          */
 443         if (ecp->change_addr != 0)
 444                 oeh.e_entry += ecp->change_addr;
 445         if (ecp->flags & SET_START)
 446                 oeh.e_entry = ecp->set_start;
 447         if (ecp->change_start != 0)
 448                 oeh.e_entry += ecp->change_start;
 449
 450         /*
 451          * Update ehdr again before we call elf_update(), since we
 452          * modified e_shoff and e_phoff.
 453          */
 454         if (gelf_update_ehdr(ecp->eout, &oeh) == 0)
 455                 errx(EXIT_FAILURE, "gelf_update_ehdr() failed: %s",
 456                     elf_errmsg(-1));
 457
 458         if (ecp->ophnum > 0)
 459                 copy_phdr(ecp);
 460
 461         /* Write out the output elf object. */
 462         if (elf_update(ecp->eout, ELF_C_WRITE) < 0)
 463                 errx(EXIT_FAILURE, "elf_update() failed: %s",
 464                     elf_errmsg(-1));
 465
 466         /* Release allocated resource. */
 467         free_elf(ecp);
 468 }
 469
 470 void
 471 free_elf(struct elfcopy *ecp)
 472 {
 473         struct segment  *seg, *seg_temp;
 474         struct section  *sec, *sec_temp;
 475
 476         /* Free internal segment list. */
 477         if (!STAILQ_EMPTY(&ecp->v_seg)) {
 478                 STAILQ_FOREACH_SAFE(seg, &ecp->v_seg, seg_list, seg_temp) {
 479                         STAILQ_REMOVE(&ecp->v_seg, seg, segment, seg_list);
 480                         free(seg);
 481                 }
 482         }
 483
 484         /* Free symbol table buffers. */
 485         free_symtab(ecp);
 486
 487         /* Free internal section list. */
 488         if (!TAILQ_EMPTY(&ecp->v_sec)) {
 489                 TAILQ_FOREACH_SAFE(sec, &ecp->v_sec, sec_list, sec_temp) {
 490                         TAILQ_REMOVE(&ecp->v_sec, sec, sec_list);
 491                         if (sec->buf != NULL)
 492                                 free(sec->buf);
 493                         if (sec->newname != NULL)
 494                                 free(sec->newname);
 495                         if (sec->pad != NULL)
 496                                 free(sec->pad);
 497                         free(sec);
 498                 }
 499         }
 500
 501         if (ecp->secndx != NULL) {
 502                 free(ecp->secndx);
 503                 ecp->secndx = NULL;
 504         }
 505 }
 506
 507 /* Create a temporary file. */
 508 void
 509 create_tempfile(char **fn, int *fd)
 510 {
 511         const char      *tmpdir;
 512         char            *cp, *tmpf;
 513         size_t           tlen, plen;
 514
 515 #define _TEMPFILE "ecp.XXXXXXXX"
 516 #define _TEMPFILEPATH "/tmp/ecp.XXXXXXXX"
 517
 518         if (fn == NULL || fd == NULL)
 519                 return;
 520         /* Repect TMPDIR environment variable. */
 521         tmpdir = getenv("TMPDIR");
 522         if (tmpdir != NULL && *tmpdir != '\0') {
 523                 tlen = strlen(tmpdir);
 524                 plen = strlen(_TEMPFILE);
 525                 tmpf = malloc(tlen + plen + 2);
 526                 if (tmpf == NULL)
 527                         err(EXIT_FAILURE, "malloc failed");
 528                 strncpy(tmpf, tmpdir, tlen);
 529                 cp = &tmpf[tlen - 1];
 530                 if (*cp++ != '/')
 531                         *cp++ = '/';
 532                 strncpy(cp, _TEMPFILE, plen);
 533                 cp[plen] = '\0';
 534         } else {
 535                 tmpf = strdup(_TEMPFILEPATH);
 536                 if (tmpf == NULL)
 537                         err(EXIT_FAILURE, "strdup failed");
 538         }
 539         if ((*fd = mkstemp(tmpf)) == -1)
 540                 err(EXIT_FAILURE, "mkstemp %s failed", tmpf);
 541         if (fchmod(*fd, 0644) == -1)
 542                 err(EXIT_FAILURE, "fchmod %s failed", tmpf);
 543         *fn = tmpf;
 544
 545 #undef _TEMPFILE
 546 #undef _TEMPFILEPATH
 547 }
 548
 549 /*
 550  * Copy temporary file with path src and file descriptor infd to path dst.
 551  * If in_place is set act as if editing the file in place, avoiding rename()
 552  * to preserve hard and symbolic links. Output file remains open, with file
 553  * descriptor returned in outfd.
 554  */
 555 static int
 556 copy_from_tempfile(const char *src, const char *dst, int infd, int *outfd,
 557     int in_place)
 558 {
 559         int tmpfd;
 560
 561         /*
 562          * First, check if we can use rename().
 563          */
 564         if (in_place == 0) {
 565                 if (rename(src, dst) >= 0) {
 566                         *outfd = infd;
 567                         return (0);
 568                 } else if (errno != EXDEV)
 569                         return (-1);
 570
 571                 /*
 572                  * If the rename() failed due to 'src' and 'dst' residing in
 573                  * two different file systems, invoke a helper function in
 574                  * libelftc to do the copy.
 575                  */
 576
 577                 if (unlink(dst) < 0)
 578                         return (-1);
 579         }
 580
 581         if ((tmpfd = open(dst, O_CREAT | O_TRUNC | O_WRONLY, 0755)) < 0)
 582                 return (-1);
 583
 584         if (elftc_copyfile(infd, tmpfd) < 0)
 585                 return (-1);
 586
 587         /*
 588          * Remove the temporary file from the file system
 589          * namespace, and close its file descriptor.
 590          */
 591         if (unlink(src) < 0)
 592                 return (-1);
 593
 594         (void) close(infd);
 595
 596         /*
 597          * Return the file descriptor for the destination.
 598          */
 599         *outfd = tmpfd;
 600
 601         return (0);
 602 }
 603
 604 static void
 605 create_file(struct elfcopy *ecp, const char *src, const char *dst)
 606 {
 607         struct stat      sb;
 608         char            *tempfile, *elftemp;
 609         int              efd, ifd, ofd, ofd0, tfd;
 610         int              in_place;
 611
 612         tempfile = NULL;
 613
 614         if (src == NULL)
 615                 errx(EXIT_FAILURE, "internal: src == NULL");
 616         if ((ifd = open(src, O_RDONLY)) == -1)
 617                 err(EXIT_FAILURE, "open %s failed", src);
 618
 619         if (fstat(ifd, &sb) == -1)
 620                 err(EXIT_FAILURE, "fstat %s failed", src);
 621
 622         if (dst == NULL)
 623                 create_tempfile(&tempfile, &ofd);
 624         else
 625                 if ((ofd = open(dst, O_RDWR|O_CREAT, 0755)) == -1)
 626                         err(EXIT_FAILURE, "open %s failed", dst);
 627
 628 #ifndef LIBELF_AR
 629         /* Detect and process ar(1) archive using libarchive. */
 630         if (ac_detect_ar(ifd)) {
 631                 ac_create_ar(ecp, ifd, ofd);
 632                 goto copy_done;
 633         }
 634 #endif
 635
 636         if (lseek(ifd, 0, SEEK_SET) < 0)
 637                 err(EXIT_FAILURE, "lseek failed");
 638
 639         /*
 640          * If input object is not ELF file, convert it to an intermediate
 641          * ELF object before processing.
 642          */
 643         if (ecp->itf != ETF_ELF) {
 644                 /*
 645                  * If the output object is not an ELF file, choose an arbitrary
 646                  * ELF format for the intermediate file. srec, ihex and binary
 647                  * formats are independent of class, endianness and machine
 648                  * type so these choices do not affect the output.
 649                  */
 650                 if (ecp->otf != ETF_ELF) {
 651                         if (ecp->oec == ELFCLASSNONE)
 652                                 ecp->oec = ELFCLASS64;
 653                         if (ecp->oed == ELFDATANONE)
 654                                 ecp->oed = ELFDATA2LSB;
 655                 }
 656                 create_tempfile(&elftemp, &efd);
 657                 if ((ecp->eout = elf_begin(efd, ELF_C_WRITE, NULL)) == NULL)
 658                         errx(EXIT_FAILURE, "elf_begin() failed: %s",
 659                             elf_errmsg(-1));
 660                 elf_flagelf(ecp->eout, ELF_C_SET, ELF_F_LAYOUT);
 661                 if (ecp->itf == ETF_BINARY)
 662                         create_elf_from_binary(ecp, ifd, src);
 663                 else if (ecp->itf == ETF_IHEX)
 664                         create_elf_from_ihex(ecp, ifd);
 665                 else if (ecp->itf == ETF_SREC)
 666                         create_elf_from_srec(ecp, ifd);
 667                 else
 668                         errx(EXIT_FAILURE, "Internal: invalid target flavour");
 669                 elf_end(ecp->eout);
 670
 671                 /* Open intermediate ELF object as new input object. */
 672                 close(ifd);
 673                 if ((ifd = open(elftemp, O_RDONLY)) == -1)
 674                         err(EXIT_FAILURE, "open %s failed", src);
 675                 close(efd);
 676                 free(elftemp);
 677         }
 678
 679         if ((ecp->ein = elf_begin(ifd, ELF_C_READ, NULL)) == NULL)
 680                 errx(EXIT_FAILURE, "elf_begin() failed: %s",
 681                     elf_errmsg(-1));
 682
 683         switch (elf_kind(ecp->ein)) {
 684         case ELF_K_NONE:
 685                 errx(EXIT_FAILURE, "file format not recognized");
 686         case ELF_K_ELF:
 687                 if ((ecp->eout = elf_begin(ofd, ELF_C_WRITE, NULL)) == NULL)
 688                         errx(EXIT_FAILURE, "elf_begin() failed: %s",
 689                             elf_errmsg(-1));
 690
 691                 /* elfcopy(1) manage ELF layout by itself. */
 692                 elf_flagelf(ecp->eout, ELF_C_SET, ELF_F_LAYOUT);
 693
 694                 /*
 695                  * Create output ELF object.
 696                  */
 697                 create_elf(ecp);
 698                 elf_end(ecp->eout);
 699
 700                 /*
 701                  * Convert the output ELF object to binary/srec/ihex if need.
 702                  */
 703                 if (ecp->otf != ETF_ELF) {
 704                         /*
 705                          * Create (another) tempfile for binary/srec/ihex
 706                          * output object.
 707                          */
 708                         if (tempfile != NULL) {
 709                                 if (unlink(tempfile) < 0)
 710                                         err(EXIT_FAILURE, "unlink %s failed",
 711                                             tempfile);
 712                                 free(tempfile);
 713                         }
 714                         create_tempfile(&tempfile, &ofd0);
 715
 716
 717                         /*
 718                          * Rewind the file descriptor being processed.
 719                          */
 720                         if (lseek(ofd, 0, SEEK_SET) < 0)
 721                                 err(EXIT_FAILURE,
 722                                     "lseek failed for the output object");
 723
 724                         /*
 725                          * Call flavour-specific conversion routine.
 726                          */
 727                         switch (ecp->otf) {
 728                         case ETF_BINARY:
 729                                 create_binary(ofd, ofd0);
 730                                 break;
 731                         case ETF_IHEX:
 732                                 create_ihex(ofd, ofd0);
 733                                 break;
 734                         case ETF_SREC:
 735                                 create_srec(ecp, ofd, ofd0,
 736                                     dst != NULL ? dst : src);
 737                                 break;
 738                         case ETF_PE:
 739                         case ETF_EFI:
 740 #if     WITH_PE
 741                                 create_pe(ecp, ofd, ofd0);
 742 #else
 743                                 errx(EXIT_FAILURE, "PE/EFI support not enabled"
 744                                     " at compile time");
 745 #endif
 746                                 break;
 747                         default:
 748                                 errx(EXIT_FAILURE, "Internal: unsupported"
 749                                     " output flavour %d", ecp->oec);
 750                         }
 751
 752                         close(ofd);
 753                         ofd = ofd0;
 754                 }
 755
 756                 break;
 757
 758         case ELF_K_AR:
 759                 /* XXX: Not yet supported. */
 760                 break;
 761         default:
 762                 errx(EXIT_FAILURE, "file format not supported");
 763         }
 764
 765         elf_end(ecp->ein);
 766
 767 #ifndef LIBELF_AR
 768 copy_done:
 769 #endif
 770
 771         if (tempfile != NULL) {
 772                 in_place = 0;
 773                 if (dst == NULL) {
 774                         dst = src;
 775                         if (lstat(dst, &sb) != -1 &&
 776                             (sb.st_nlink > 1 || S_ISLNK(sb.st_mode)))
 777                                 in_place = 1;
 778                 }
 779
 780                 if (copy_from_tempfile(tempfile, dst, ofd, &tfd, in_place) < 0)
 781                         err(EXIT_FAILURE, "creation of %s failed", dst);
 782
 783                 free(tempfile);
 784                 tempfile = NULL;
 785
 786                 ofd = tfd;
 787         }
 788
 789         if (strcmp(dst, "/dev/null") && fchmod(ofd, sb.st_mode) == -1)
 790                 err(EXIT_FAILURE, "fchmod %s failed", dst);
 791
 792         if ((ecp->flags & PRESERVE_DATE) &&
 793             elftc_set_timestamps(dst, &sb) < 0)
 794                 err(EXIT_FAILURE, "setting timestamps failed");
 795
 796         close(ifd);
 797         close(ofd);
 798 }
 799
 800 static void
 801 elfcopy_main(struct elfcopy *ecp, int argc, char **argv)
 802 {
 803         struct sec_action       *sac;
 804         const char              *infile, *outfile;
 805         char                    *fn, *s;
 806         int                      opt;
 807
 808         while ((opt = getopt_long(argc, argv, "dB:gG:I:j:K:L:N:O:pR:s:SwW:xXV",
 809             elfcopy_longopts, NULL)) != -1) {
 810                 switch(opt) {
 811                 case 'B':
 812                         /* ignored */
 813                         break;
 814                 case 'R':
 815                         sac = lookup_sec_act(ecp, optarg, 1);
 816                         if (sac->copy != 0)
 817                                 errx(EXIT_FAILURE,
 818                                     "both copy and remove specified");
 819                         sac->remove = 1;
 820                         ecp->flags |= SEC_REMOVE;
 821                         break;
 822                 case 'S':
 823                         ecp->strip = STRIP_ALL;
 824                         break;
 825                 case 'g':
 826                         ecp->strip = STRIP_DEBUG;
 827                         break;
 828                 case 'G':
 829                         ecp->flags |= KEEP_GLOBAL;
 830                         add_to_symop_list(ecp, optarg, NULL, SYMOP_KEEPG);
 831                         break;
 832                 case 'I':
 833                 case 's':
 834                         set_input_target(ecp, optarg);
 835                         break;
 836                 case 'j':
 837                         sac = lookup_sec_act(ecp, optarg, 1);
 838                         if (sac->remove != 0)
 839                                 errx(EXIT_FAILURE,
 840                                     "both copy and remove specified");
 841                         sac->copy = 1;
 842                         ecp->flags |= SEC_COPY;
 843                         break;
 844                 case 'K':
 845                         add_to_symop_list(ecp, optarg, NULL, SYMOP_KEEP);
 846                         break;
 847                 case 'L':
 848                         add_to_symop_list(ecp, optarg, NULL, SYMOP_LOCALIZE);
 849                         break;
 850                 case 'N':
 851                         add_to_symop_list(ecp, optarg, NULL, SYMOP_STRIP);
 852                         break;
 853                 case 'O':
 854                         set_output_target(ecp, optarg);
 855                         break;
 856                 case 'p':
 857                         ecp->flags |= PRESERVE_DATE;
 858                         break;
 859                 case 'V':
 860                         print_version();
 861                         break;
 862                 case 'w':
 863                         ecp->flags |= WILDCARD;
 864                         break;
 865                 case 'W':
 866                         add_to_symop_list(ecp, optarg, NULL, SYMOP_WEAKEN);
 867                         break;
 868                 case 'x':
 869                         ecp->flags |= DISCARD_LOCAL;
 870                         break;
 871                 case 'X':
 872                         ecp->flags |= DISCARD_LLABEL;
 873                         break;
 874                 case ECP_ADD_GNU_DEBUGLINK:
 875                         ecp->debuglink = optarg;
 876                         break;
 877                 case ECP_ADD_SECTION:
 878                         add_section(ecp, optarg);
 879                         break;
 880                 case ECP_CHANGE_ADDR:
 881                         ecp->change_addr = (int64_t) strtoll(optarg, NULL, 0);
 882                         break;
 883                 case ECP_CHANGE_SEC_ADDR:
 884                         parse_sec_address_op(ecp, opt, "--change-section-addr",
 885                             optarg);
 886                         break;
 887                 case ECP_CHANGE_SEC_LMA:
 888                         parse_sec_address_op(ecp, opt, "--change-section-lma",
 889                             optarg);
 890                         break;
 891                 case ECP_CHANGE_SEC_VMA:
 892                         parse_sec_address_op(ecp, opt, "--change-section-vma",
 893                             optarg);
 894                         break;
 895                 case ECP_CHANGE_START:
 896                         ecp->change_start = (int64_t) strtoll(optarg, NULL, 0);
 897                         break;
 898                 case ECP_CHANGE_WARN:
 899                         /* default */
 900                         break;
 901                 case ECP_GAP_FILL:
 902                         ecp->fill = (uint8_t) strtoul(optarg, NULL, 0);
 903                         ecp->flags |= GAP_FILL;
 904                         break;
 905                 case ECP_GLOBALIZE_SYMBOL:
 906                         add_to_symop_list(ecp, optarg, NULL, SYMOP_GLOBALIZE);
 907                         break;
 908                 case ECP_GLOBALIZE_SYMBOLS:
 909                         parse_symlist_file(ecp, optarg, SYMOP_GLOBALIZE);
 910                         break;
 911                 case ECP_KEEP_SYMBOLS:
 912                         parse_symlist_file(ecp, optarg, SYMOP_KEEP);
 913                         break;
 914                 case ECP_KEEP_GLOBAL_SYMBOLS:
 915                         parse_symlist_file(ecp, optarg, SYMOP_KEEPG);
 916                         break;
 917                 case ECP_LOCALIZE_HIDDEN:
 918                         ecp->flags |= LOCALIZE_HIDDEN;
 919                         break;
 920                 case ECP_LOCALIZE_SYMBOLS:
 921                         parse_symlist_file(ecp, optarg, SYMOP_LOCALIZE);
 922                         break;
 923                 case ECP_NO_CHANGE_WARN:
 924                         ecp->flags |= NO_CHANGE_WARN;
 925                         break;
 926                 case ECP_ONLY_DEBUG:
 927                         ecp->strip = STRIP_NONDEBUG;
 928                         break;
 929                 case ECP_ONLY_DWO:
 930                         ecp->strip = STRIP_NONDWO;
 931                         break;
 932                 case ECP_PAD_TO:
 933                         ecp->pad_to = (uint64_t) strtoull(optarg, NULL, 0);
 934                         break;
 935                 case ECP_PREFIX_ALLOC:
 936                         ecp->prefix_alloc = optarg;
 937                         break;
 938                 case ECP_PREFIX_SEC:
 939                         ecp->prefix_sec = optarg;
 940                         break;
 941                 case ECP_PREFIX_SYM:
 942                         ecp->prefix_sym = optarg;
 943                         break;
 944                 case ECP_REDEF_SYMBOL:
 945                         if ((s = strchr(optarg, '=')) == NULL)
 946                                 errx(EXIT_FAILURE,
 947                                     "illegal format for --redefine-sym");
 948                         *s++ = '\0';
 949                         add_to_symop_list(ecp, optarg, s, SYMOP_REDEF);
 950                         break;
 951                 case ECP_REDEF_SYMBOLS:
 952                         parse_symlist_file(ecp, optarg, SYMOP_REDEF);
 953                         break;
 954                 case ECP_RENAME_SECTION:
 955                         if ((fn = strchr(optarg, '=')) == NULL)
 956                                 errx(EXIT_FAILURE,
 957                                     "illegal format for --rename-section");
 958                         *fn++ = '\0';
 959
 960                         /* Check for optional flags. */
 961                         if ((s = strchr(fn, ',')) != NULL)
 962                                 *s++ = '\0';
 963
 964                         sac = lookup_sec_act(ecp, optarg, 1);
 965                         sac->rename = 1;
 966                         sac->newname = fn;
 967                         if (s != NULL)
 968                                 parse_sec_flags(sac, s);
 969                         break;
 970                 case ECP_SET_OSABI:
 971                         set_osabi(ecp, optarg);
 972                         break;
 973                 case ECP_SET_SEC_FLAGS:
 974                         if ((s = strchr(optarg, '=')) == NULL)
 975                                 errx(EXIT_FAILURE,
 976                                     "illegal format for --set-section-flags");
 977                         *s++ = '\0';
 978                         sac = lookup_sec_act(ecp, optarg, 1);
 979                         parse_sec_flags(sac, s);
 980                         break;
 981                 case ECP_SET_START:
 982                         ecp->flags |= SET_START;
 983                         ecp->set_start = (uint64_t) strtoull(optarg, NULL, 0);
 984                         break;
 985                 case ECP_SREC_FORCE_S3:
 986                         ecp->flags |= SREC_FORCE_S3;
 987                         break;
 988                 case ECP_SREC_LEN:
 989                         ecp->flags |= SREC_FORCE_LEN;
 990                         ecp->srec_len = strtoul(optarg, NULL, 0);
 991                         break;
 992                 case ECP_STRIP_DWO:
 993                         ecp->strip = STRIP_DWO;
 994                         break;
 995                 case ECP_STRIP_SYMBOLS:
 996                         parse_symlist_file(ecp, optarg, SYMOP_STRIP);
 997                         break;
 998                 case ECP_STRIP_UNNEEDED:
 999                         ecp->strip = STRIP_UNNEEDED;
1000                         break;
1001                 case ECP_WEAKEN_ALL:
1002                         ecp->flags |= WEAKEN_ALL;
1003                         break;
1004                 case ECP_WEAKEN_SYMBOLS:
1005                         parse_symlist_file(ecp, optarg, SYMOP_WEAKEN);
1006                         break;
1007                 default:
1008                         elfcopy_usage();
1009                 }
1010         }
1011
1012         if (optind == argc || optind + 2 < argc)
1013                 elfcopy_usage();
1014
1015         infile = argv[optind];
1016         outfile = NULL;
1017         if (optind + 1 < argc)
1018                 outfile = argv[optind + 1];
1019
1020         create_file(ecp, infile, outfile);
1021 }
1022
1023 static void
1024 mcs_main(struct elfcopy *ecp, int argc, char **argv)
1025 {
1026         struct sec_action       *sac;
1027         const char              *string;
1028         int                      append, delete, compress, name, print;
1029         int                      opt, i;
1030
1031         append = delete = compress = name = print = 0;
1032         string = NULL;
1033         while ((opt = getopt_long(argc, argv, "a:cdhn:pV", mcs_longopts,
1034                 NULL)) != -1) {
1035                 switch(opt) {
1036                 case 'a':
1037                         append = 1;
1038                         string = optarg; /* XXX multiple -a not supported */
1039                         break;
1040                 case 'c':
1041                         compress = 1;
1042                         break;
1043                 case 'd':
1044                         delete = 1;
1045                         break;
1046                 case 'n':
1047                         name = 1;
1048                         (void)lookup_sec_act(ecp, optarg, 1);
1049                         break;
1050                 case 'p':
1051                         print = 1;
1052                         break;
1053                 case 'V':
1054                         print_version();
1055                         break;
1056                 case 'h':
1057                 default:
1058                         mcs_usage();
1059                 }
1060         }
1061
1062         if (optind == argc)
1063                 mcs_usage();
1064
1065         /* Must specify one operation at least. */
1066         if (!append && !compress && !delete && !print)
1067                 mcs_usage();
1068
1069         /*
1070          * If we are going to delete, ignore other operations. This is
1071          * different from the Solaris implementation, which can print
1072          * and delete a section at the same time, for example. Also, this
1073          * implementation do not respect the order between operations that
1074          * user specified, i.e., "mcs -pc a.out" equals to "mcs -cp a.out".
1075          */
1076         if (delete) {
1077                 append = compress = print = 0;
1078                 ecp->flags |= SEC_REMOVE;
1079         }
1080         if (append)
1081                 ecp->flags |= SEC_APPEND;
1082         if (compress)
1083                 ecp->flags |= SEC_COMPRESS;
1084         if (print)
1085                 ecp->flags |= SEC_PRINT;
1086
1087         /* .comment is the default section to operate on. */
1088         if (!name)
1089                 (void)lookup_sec_act(ecp, ".comment", 1);
1090
1091         STAILQ_FOREACH(sac, &ecp->v_sac, sac_list) {
1092                 sac->append = append;
1093                 sac->compress = compress;
1094                 sac->print = print;
1095                 sac->remove = delete;
1096                 sac->string = string;
1097         }
1098
1099         for (i = optind; i < argc; i++) {
1100                 /* If only -p is specified, output to /dev/null */
1101                 if (print && !append && !compress && !delete)
1102                         create_file(ecp, argv[i], "/dev/null");
1103                 else
1104                         create_file(ecp, argv[i], NULL);
1105         }
1106 }
1107
1108 static void
1109 strip_main(struct elfcopy *ecp, int argc, char **argv)
1110 {
1111         struct sec_action       *sac;
1112         const char              *outfile;
1113         int                      opt;
1114         int                      i;
1115
1116         outfile = NULL;
1117         while ((opt = getopt_long(argc, argv, "hI:K:N:o:O:pR:sSdgVxXw",
1118             strip_longopts, NULL)) != -1) {
1119                 switch(opt) {
1120                 case 'R':
1121                         sac = lookup_sec_act(ecp, optarg, 1);
1122                         sac->remove = 1;
1123                         ecp->flags |= SEC_REMOVE;
1124                         break;
1125                 case 's':
1126                         ecp->strip = STRIP_ALL;
1127                         break;
1128                 case 'S':
1129                 case 'g':
1130                 case 'd':
1131                         ecp->strip = STRIP_DEBUG;
1132                         break;
1133                 case 'I':
1134                         /* ignored */
1135                         break;
1136                 case 'K':
1137                         add_to_symop_list(ecp, optarg, NULL, SYMOP_KEEP);
1138                         break;
1139                 case 'N':
1140                         add_to_symop_list(ecp, optarg, NULL, SYMOP_STRIP);
1141                         break;
1142                 case 'o':
1143                         outfile = optarg;
1144                         break;
1145                 case 'O':
1146                         set_output_target(ecp, optarg);
1147                         break;
1148                 case 'p':
1149                         ecp->flags |= PRESERVE_DATE;
1150                         break;
1151                 case 'V':
1152                         print_version();
1153                         break;
1154                 case 'w':
1155                         ecp->flags |= WILDCARD;
1156                         break;
1157                 case 'x':
1158                         ecp->flags |= DISCARD_LOCAL;
1159                         break;
1160                 case 'X':
1161                         ecp->flags |= DISCARD_LLABEL;
1162                         break;
1163                 case ECP_ONLY_DEBUG:
1164                         ecp->strip = STRIP_NONDEBUG;
1165                         break;
1166                 case ECP_STRIP_UNNEEDED:
1167                         ecp->strip = STRIP_UNNEEDED;
1168                         break;
1169                 case 'h':
1170                 default:
1171                         strip_usage();
1172                 }
1173         }
1174
1175         if (ecp->strip == 0 &&
1176             ((ecp->flags & DISCARD_LOCAL) == 0) &&
1177             ((ecp->flags & DISCARD_LLABEL) == 0) &&
1178             lookup_symop_list(ecp, NULL, SYMOP_STRIP) == NULL)
1179                 ecp->strip = STRIP_ALL;
1180         if (optind == argc)
1181                 strip_usage();
1182
1183         for (i = optind; i < argc; i++)
1184                 create_file(ecp, argv[i], outfile);
1185 }
1186
1187 static void
1188 parse_sec_flags(struct sec_action *sac, char *s)
1189 {
1190         const char      *flag;
1191         int              found, i;
1192
1193         for (flag = strtok(s, ","); flag; flag = strtok(NULL, ",")) {
1194                 found = 0;
1195                 for (i = 0; sec_flags[i].name != NULL; i++)
1196                         if (strcasecmp(sec_flags[i].name, flag) == 0) {
1197                                 sac->flags |= sec_flags[i].value;
1198                                 found = 1;
1199                                 break;
1200                         }
1201                 if (!found)
1202                         errx(EXIT_FAILURE, "unrecognized section flag %s",
1203                             flag);
1204         }
1205 }
1206
1207 static void
1208 parse_sec_address_op(struct elfcopy *ecp, int optnum, const char *optname,
1209     char *s)
1210 {
1211         struct sec_action       *sac;
1212         const char              *name;
1213         char                    *v;
1214         char                     op;
1215
1216         name = v = s;
1217         do {
1218                 v++;
1219         } while (*v != '\0' && *v != '=' && *v != '+' && *v != '-');
1220         if (*v == '\0' || *(v + 1) == '\0')
1221                 errx(EXIT_FAILURE, "invalid format for %s", optname);
1222         op = *v;
1223         *v++ = '\0';
1224         sac = lookup_sec_act(ecp, name, 1);
1225         switch (op) {
1226         case '=':
1227                 if (optnum == ECP_CHANGE_SEC_LMA ||
1228                     optnum == ECP_CHANGE_SEC_ADDR) {
1229                         sac->setlma = 1;
1230                         sac->lma = (uint64_t) strtoull(v, NULL, 0);
1231                 }
1232                 if (optnum == ECP_CHANGE_SEC_VMA ||
1233                     optnum == ECP_CHANGE_SEC_ADDR) {
1234                         sac->setvma = 1;
1235                         sac->vma = (uint64_t) strtoull(v, NULL, 0);
1236                 }
1237                 break;
1238         case '+':
1239                 if (optnum == ECP_CHANGE_SEC_LMA ||
1240                     optnum == ECP_CHANGE_SEC_ADDR)
1241                         sac->lma_adjust = (int64_t) strtoll(v, NULL, 0);
1242                 if (optnum == ECP_CHANGE_SEC_VMA ||
1243                     optnum == ECP_CHANGE_SEC_ADDR)
1244                         sac->vma_adjust = (int64_t) strtoll(v, NULL, 0);
1245                 break;
1246         case '-':
1247                 if (optnum == ECP_CHANGE_SEC_LMA ||
1248                     optnum == ECP_CHANGE_SEC_ADDR)
1249                         sac->lma_adjust = (int64_t) -strtoll(v, NULL, 0);
1250                 if (optnum == ECP_CHANGE_SEC_VMA ||
1251                     optnum == ECP_CHANGE_SEC_ADDR)
1252                         sac->vma_adjust = (int64_t) -strtoll(v, NULL, 0);
1253                 break;
1254         default:
1255                 break;
1256         }
1257 }
1258
1259 static void
1260 parse_symlist_file(struct elfcopy *ecp, const char *fn, unsigned int op)
1261 {
1262         struct symfile  *sf;
1263         struct stat      sb;
1264         FILE            *fp;
1265         char            *data, *p, *line, *end, *e, *n;
1266
1267         if (stat(fn, &sb) == -1)
1268                 err(EXIT_FAILURE, "stat %s failed", fn);
1269
1270         /* Check if we already read and processed this file. */
1271         STAILQ_FOREACH(sf, &ecp->v_symfile, symfile_list) {
1272                 if (sf->dev == sb.st_dev && sf->ino == sb.st_ino)
1273                         goto process_symfile;
1274         }
1275
1276         if ((fp = fopen(fn, "r")) == NULL)
1277                 err(EXIT_FAILURE, "can not open %s", fn);
1278         if ((data = malloc(sb.st_size + 1)) == NULL)
1279                 err(EXIT_FAILURE, "malloc failed");
1280         if (fread(data, 1, sb.st_size, fp) == 0 || ferror(fp))
1281                 err(EXIT_FAILURE, "fread failed");
1282         fclose(fp);
1283         data[sb.st_size] = '\0';
1284
1285         if ((sf = calloc(1, sizeof(*sf))) == NULL)
1286                 err(EXIT_FAILURE, "malloc failed");
1287         sf->dev = sb.st_dev;
1288         sf->ino = sb.st_ino;
1289         sf->size = sb.st_size + 1;
1290         sf->data = data;
1291
1292 process_symfile:
1293
1294         /*
1295          * Basically what we do here is to convert EOL to '\0', and remove
1296          * leading and trailing whitespaces for each line.
1297          */
1298
1299         end = sf->data + sf->size;
1300         line = NULL;
1301         for(p = sf->data; p < end; p++) {
1302                 if ((*p == '\t' || *p == ' ') && line == NULL)
1303                         continue;
1304                 if (*p == '\r' || *p == '\n' || *p == '\0') {
1305                         *p = '\0';
1306                         if (line == NULL)
1307                                 continue;
1308
1309                         /* Skip comment. */
1310                         if (*line == '#') {
1311                                 line = NULL;
1312                                 continue;
1313                         }
1314
1315                         e = p - 1;
1316                         while(e != line && (*e == '\t' || *e == ' '))
1317                                 *e-- = '\0';
1318                         if (op != SYMOP_REDEF)
1319                                 add_to_symop_list(ecp, line, NULL, op);
1320                         else {
1321                                 if (strlen(line) < 3)
1322                                         errx(EXIT_FAILURE,
1323                                             "illegal format for"
1324                                             " --redefine-sym");
1325                                 for(n = line + 1; n < e; n++) {
1326                                         if (*n == ' ' || *n == '\t') {
1327                                                 while(*n == ' ' || *n == '\t')
1328                                                         *n++ = '\0';
1329                                                 break;
1330                                         }
1331                                 }
1332                                 if (n >= e)
1333                                         errx(EXIT_FAILURE,
1334                                             "illegal format for"
1335                                             " --redefine-sym");
1336                                 add_to_symop_list(ecp, line, n, op);
1337                         }
1338                         line = NULL;
1339                         continue;
1340                 }
1341
1342                 if (line == NULL)
1343                         line = p;
1344         }
1345 }
1346
1347 static void
1348 set_input_target(struct elfcopy *ecp, const char *target_name)
1349 {
1350         Elftc_Bfd_Target *tgt;
1351
1352         if ((tgt = elftc_bfd_find_target(target_name)) == NULL)
1353                 errx(EXIT_FAILURE, "%s: invalid target name", target_name);
1354         ecp->itf = elftc_bfd_target_flavor(tgt);
1355 }
1356
1357 static void
1358 set_output_target(struct elfcopy *ecp, const char *target_name)
1359 {
1360         Elftc_Bfd_Target *tgt;
1361
1362         if ((tgt = elftc_bfd_find_target(target_name)) == NULL)
1363                 errx(EXIT_FAILURE, "%s: invalid target name", target_name);
1364         ecp->otf = elftc_bfd_target_flavor(tgt);
1365         if (ecp->otf == ETF_ELF) {
1366                 ecp->oec = elftc_bfd_target_class(tgt);
1367                 ecp->oed = elftc_bfd_target_byteorder(tgt);
1368                 ecp->oem = elftc_bfd_target_machine(tgt);
1369         }
1370         if (ecp->otf == ETF_EFI || ecp->otf == ETF_PE)
1371                 ecp->oem = elftc_bfd_target_machine(tgt);
1372
1373         ecp->otgt = target_name;
1374 }
1375
1376 static void
1377 set_osabi(struct elfcopy *ecp, const char *abi)
1378 {
1379         int i, found;
1380
1381         found = 0;
1382         for (i = 0; osabis[i].name != NULL; i++)
1383                 if (strcasecmp(osabis[i].name, abi) == 0) {
1384                         ecp->abi = osabis[i].abi;
1385                         found = 1;
1386                         break;
1387                 }
1388         if (!found)
1389                 errx(EXIT_FAILURE, "unrecognized OSABI %s", abi);
1390 }
1391
1392 #define ELFCOPY_USAGE_MESSAGE   "\
1393 Usage: %s [options] infile [outfile]\n\
1394   Transform object files.\n\n\
1395   Options:\n\
1396   -d | -g | --strip-debug      Remove debugging information from the output.\n\
1397   -j SECTION | --only-section=SECTION\n\
1398                                Copy only the named section to the output.\n\
1399   -p | --preserve-dates        Preserve access and modification times.\n\
1400   -w | --wildcard              Use shell-style patterns to name symbols.\n\
1401   -x | --discard-all           Do not copy non-globals to the output.\n\
1402   -I FORMAT | --input-target=FORMAT\n\
1403                                Specify object format for the input file.\n\
1404   -K SYM | --keep-symbol=SYM   Copy symbol SYM to the output.\n\
1405   -L SYM | --localize-symbol=SYM\n\
1406                                Make symbol SYM local to the output file.\n\
1407   -N SYM | --strip-symbol=SYM  Do not copy symbol SYM to the output.\n\
1408   -O FORMAT | --output-target=FORMAT\n\
1409                                Specify object format for the output file.\n\
1410                                FORMAT should be a target name understood by\n\
1411                                elftc_bfd_find_target(3).\n\
1412   -R NAME | --remove-section=NAME\n\
1413                                Remove the named section.\n\
1414   -S | --strip-all             Remove all symbol and relocation information\n\
1415                                from the output.\n\
1416   -V | --version               Print a version identifier and exit.\n\
1417   -W SYM | --weaken-symbol=SYM Mark symbol SYM as weak in the output.\n\
1418   -X | --discard-locals        Do not copy compiler generated symbols to\n\
1419                                the output.\n\
1420   --add-section NAME=FILE      Add the contents of FILE to the ELF object as\n\
1421                                a new section named NAME.\n\
1422   --adjust-section-vma SECTION{=,+,-}VAL | \\\n\
1423     --change-section-address SECTION{=,+,-}VAL\n\
1424                                Set or adjust the VMA and the LMA of the\n\
1425                                named section by VAL.\n\
1426   --adjust-start=INCR | --change-start=INCR\n\
1427                                Add INCR to the start address for the ELF\n\
1428                                object.\n\
1429   --adjust-vma=INCR | --change-addresses=INCR\n\
1430                                Increase the VMA and LMA of all sections by\n\
1431                                INCR.\n\
1432   --adjust-warning | --change-warnings\n\
1433                                Issue warnings for non-existent sections.\n\
1434   --change-section-lma SECTION{=,+,-}VAL\n\
1435                                Set or adjust the LMA address of the named\n\
1436                                section by VAL.\n\
1437   --change-section-vma SECTION{=,+,-}VAL\n\
1438                                Set or adjust the VMA address of the named\n\
1439                                section by VAL.\n\
1440   --gap-fill=VAL               Fill the gaps between sections with bytes\n\
1441                                of value VAL.\n\
1442   --localize-hidden            Make all hidden symbols local to the output\n\
1443                                file.\n\
1444   --no-adjust-warning| --no-change-warnings\n\
1445                                Do not issue warnings for non-existent\n\
1446                                sections.\n\
1447   --only-keep-debug            Copy only debugging information.\n\
1448   --output-target=FORMAT       Use the specified format for the output.\n\
1449   --pad-to=ADDRESS             Pad the output object upto the given address.\n\
1450   --prefix-alloc-sections=STRING\n\
1451                                Prefix the section names of all the allocated\n\
1452                                sections with STRING.\n\
1453   --prefix-sections=STRING     Prefix the section names of all the sections\n\
1454                                with STRING.\n\
1455   --prefix-symbols=STRING      Prefix the symbol names of all the symbols\n\
1456                                with STRING.\n\
1457   --rename-section OLDNAME=NEWNAME[,FLAGS]\n\
1458                                Rename and optionally change section flags.\n\
1459   --set-section-flags SECTION=FLAGS\n\
1460                                Set section flags for the named section.\n\
1461                                Supported flags are: 'alloc', 'code',\n\
1462                                'contents', 'data', 'debug', 'load',\n\
1463                                'noload', 'readonly', 'rom', and 'shared'.\n\
1464   --set-start=ADDRESS          Set the start address of the ELF object.\n\
1465   --srec-forceS3               Only generate S3 S-Records.\n\
1466   --srec-len=LEN               Set the maximum length of a S-Record line.\n\
1467   --strip-unneeded             Do not copy relocation information.\n"
1468
1469 static void
1470 elfcopy_usage(void)
1471 {
1472         (void) fprintf(stderr, ELFCOPY_USAGE_MESSAGE, ELFTC_GETPROGNAME());
1473         exit(EXIT_FAILURE);
1474 }
1475
1476 #define MCS_USAGE_MESSAGE       "\
1477 Usage: %s [options] file...\n\
1478   Manipulate the comment section in an ELF object.\n\n\
1479   Options:\n\
1480   -a STRING        Append 'STRING' to the comment section.\n\
1481   -c               Remove duplicate entries from the comment section.\n\
1482   -d               Delete the comment section.\n\
1483   -h | --help      Print a help message and exit.\n\
1484   -n NAME          Operate on the ELF section with name 'NAME'.\n\
1485   -p               Print the contents of the comment section.\n\
1486   -V | --version   Print a version identifier and exit.\n"
1487
1488 static void
1489 mcs_usage(void)
1490 {
1491         (void) fprintf(stderr, MCS_USAGE_MESSAGE, ELFTC_GETPROGNAME());
1492         exit(EXIT_FAILURE);
1493 }
1494
1495 #define STRIP_USAGE_MESSAGE     "\
1496 Usage: %s [options] file...\n\
1497   Discard information from ELF objects.\n\n\
1498   Options:\n\
1499   -d | -g | -S | --strip-debug    Remove debugging symbols.\n\
1500   -h | --help                     Print a help message.\n\
1501   -o FILE | --output-file FILE    Write output to FILE.\n\
1502   --only-keep-debug               Keep debugging information only.\n\
1503   -p | --preserve-dates           Preserve access and modification times.\n\
1504   -s | --strip-all                Remove all symbols.\n\
1505   --strip-unneeded                Remove symbols not needed for relocation\n\
1506                                   processing.\n\
1507   -w | --wildcard                 Use shell-style patterns to name symbols.\n\
1508   -x | --discard-all              Discard all non-global symbols.\n\
1509   -I TGT| --input-target=TGT      (Accepted, but ignored).\n\
1510   -K SYM | --keep-symbol=SYM      Keep symbol 'SYM' in the output.\n\
1511   -N SYM | --strip-symbol=SYM     Remove symbol 'SYM' from the output.\n\
1512   -O TGT | --output-target=TGT    Set the output file format to 'TGT'.\n\
1513   -R SEC | --remove-section=SEC   Remove the section named 'SEC'.\n\
1514   -V | --version                  Print a version identifier and exit.\n\
1515   -X | --discard-locals           Remove compiler-generated local symbols.\n"
1516
1517 static void
1518 strip_usage(void)
1519 {
1520         (void) fprintf(stderr, STRIP_USAGE_MESSAGE, ELFTC_GETPROGNAME());
1521         exit(EXIT_FAILURE);
1522 }
1523
1524 static void
1525 print_version(void)
1526 {
1527         (void) printf("%s (%s)\n", ELFTC_GETPROGNAME(), elftc_version());
1528         exit(EXIT_SUCCESS);
1529 }
1530
1531 int
1532 main(int argc, char **argv)
1533 {
1534         struct elfcopy *ecp;
1535
1536         if (elf_version(EV_CURRENT) == EV_NONE)
1537                 errx(EXIT_FAILURE, "ELF library initialization failed: %s",
1538                     elf_errmsg(-1));
1539
1540         ecp = calloc(1, sizeof(*ecp));
1541         if (ecp == NULL)
1542                 err(EXIT_FAILURE, "calloc failed");
1543         memset(ecp, 0, sizeof(*ecp));
1544
1545         ecp->itf = ecp->otf = ETF_ELF;
1546         ecp->iec = ecp->oec = ELFCLASSNONE;
1547         ecp->oed = ELFDATANONE;
1548         ecp->abi = -1;
1549         /* There is always an empty section. */
1550         ecp->nos = 1;
1551         ecp->fill = 0;
1552
1553         STAILQ_INIT(&ecp->v_seg);
1554         STAILQ_INIT(&ecp->v_sac);
1555         STAILQ_INIT(&ecp->v_sadd);
1556         STAILQ_INIT(&ecp->v_symop);
1557         STAILQ_INIT(&ecp->v_symfile);
1558         STAILQ_INIT(&ecp->v_arobj);
1559         TAILQ_INIT(&ecp->v_sec);
1560
1561         if ((ecp->progname = ELFTC_GETPROGNAME()) == NULL)
1562                 ecp->progname = "elfcopy";
1563
1564         if (strcmp(ecp->progname, "strip") == 0)
1565                 strip_main(ecp, argc, argv);
1566         else if (strcmp(ecp->progname, "mcs") == 0)
1567                 mcs_main(ecp, argc, argv);
1568         else
1569                 elfcopy_main(ecp, argc, argv);
1570
1571         free_sec_add(ecp);
1572         free_sec_act(ecp);
1573         free(ecp);
1574
1575         exit(EXIT_SUCCESS);
1576 }