tools/relocate-rela.c

   1 // SPDX-License-Identifier: GPL-2.0+ OR BSD-2-Clause
   2 /*
   3  * Copyright 2013 Freescale Semiconductor, Inc.
   4  *
   5  * 64-bit and little-endian target only until we need to support a different
   6  * arch that needs this.
   7  */
   8
   9 #include <elf.h>
  10 #include <errno.h>
  11 #include <inttypes.h>
  12 #include <stdarg.h>
  13 #include <stdbool.h>
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include <string.h>
  17 #include "compiler.h"
  18
  19 #ifndef EM_AARCH64
  20 #define EM_AARCH64              183
  21 #endif
  22
  23 #ifndef R_AARCH64_RELATIVE
  24 #define R_AARCH64_RELATIVE      1027
  25 #endif
  26
  27 #ifndef EM_MICROBLAZE
  28 #define EM_MICROBLAZE           189
  29 #endif
  30
  31 #ifndef R_MICROBLAZE_NONE
  32 #define R_MICROBLAZE_NONE       0
  33 #endif
  34
  35 #ifndef R_MICROBLAZE_32
  36 #define R_MICROBLAZE_32         1
  37 #endif
  38
  39 #ifndef R_MICROBLAZE_REL
  40 #define R_MICROBLAZE_REL        16
  41 #endif
  42
  43 #ifndef R_MICROBLAZE_GLOB_DAT
  44 #define R_MICROBLAZE_GLOB_DAT   18
  45 #endif
  46
  47 static int ei_class;
  48 static int ei_data;
  49
  50 static uint64_t rela_start, rela_end, text_base, dyn_start;
  51
  52 static const bool debug_en;
  53
  54 static void debug(const char *fmt, ...)
  55 {
  56         va_list args;
  57
  58         if (debug_en) {
  59                 va_start(args, fmt);
  60                 vprintf(fmt, args);
  61                 va_end(args);
  62         }
  63 }
  64
  65 static uint16_t elf16_to_cpu(uint16_t data)
  66 {
  67         if (ei_data == ELFDATA2LSB)
  68                 return le16_to_cpu(data);
  69
  70         return be16_to_cpu(data);
  71 }
  72
  73 static uint32_t elf32_to_cpu(uint32_t data)
  74 {
  75         if (ei_data == ELFDATA2LSB)
  76                 return le32_to_cpu(data);
  77
  78         return be32_to_cpu(data);
  79 }
  80
  81 static bool supported_rela(Elf64_Rela *rela)
  82 {
  83         uint64_t mask = 0xffffffffULL; /* would be different on 32-bit */
  84         uint32_t type = rela->r_info & mask;
  85
  86         switch (type) {
  87         case R_AARCH64_RELATIVE:
  88                 return true;
  89         default:
  90                 fprintf(stderr, "warning: unsupported relocation type %"
  91                                 PRIu32 " at %" PRIx64 "\n",
  92                         type, rela->r_offset);
  93
  94                 return false;
  95         }
  96 }
  97
  98 static int decode_elf64(FILE *felf, char **argv)
  99 {
 100         size_t size;
 101         Elf64_Ehdr header;
 102         uint64_t section_header_base, section_header_size;
 103         uint64_t sh_addr, sh_offset, sh_size;
 104         Elf64_Half sh_index, sh_num;
 105         Elf64_Shdr *sh_table; /* Elf symbol table */
 106         int ret, i, machine;
 107         char *sh_str;
 108
 109         debug("64bit version\n");
 110
 111         /* Make sure we are at start */
 112         rewind(felf);
 113
 114         size = fread(&header, 1, sizeof(header), felf);
 115         if (size != sizeof(header)) {
 116                 fclose(felf);
 117                 return 25;
 118         }
 119
 120         machine = le16_to_cpu(header.e_machine);
 121         debug("Machine\t%d\n", machine);
 122
 123         if (machine != EM_AARCH64) {
 124                 fprintf(stderr, "%s: Not supported machine type\n", argv[0]);
 125                 return 30;
 126         }
 127
 128         text_base = le64_to_cpu(header.e_entry);
 129         section_header_base = le64_to_cpu(header.e_shoff);
 130         section_header_size = le16_to_cpu(header.e_shentsize) *
 131                               le16_to_cpu(header.e_shnum);
 132
 133         sh_table = malloc(section_header_size);
 134         if (!sh_table) {
 135                 fprintf(stderr, "%s: Cannot allocate space for section header\n",
 136                         argv[0]);
 137                 fclose(felf);
 138                 return 26;
 139         }
 140
 141         ret = fseek(felf, section_header_base, SEEK_SET);
 142         if (ret) {
 143                 fprintf(stderr, "%s: Can't set pointer to section header: %x/%lx\n",
 144                         argv[0], ret, section_header_base);
 145                 free(sh_table);
 146                 fclose(felf);
 147                 return 26;
 148         }
 149
 150         size = fread(sh_table, 1, section_header_size, felf);
 151         if (size != section_header_size) {
 152                 fprintf(stderr, "%s: Can't read section header: %lx/%lx\n",
 153                         argv[0], size, section_header_size);
 154                 free(sh_table);
 155                 fclose(felf);
 156                 return 27;
 157         }
 158
 159         sh_index = le16_to_cpu(header.e_shstrndx);
 160         sh_size = le64_to_cpu(sh_table[sh_index].sh_size);
 161         debug("e_shstrndx %x, sh_size %lx\n", sh_index, sh_size);
 162
 163         sh_str = malloc(sh_size);
 164         if (!sh_str) {
 165                 fprintf(stderr, "malloc failed\n");
 166                 free(sh_table);
 167                 fclose(felf);
 168                 return 28;
 169         }
 170
 171         /*
 172          * Specifies the byte offset from the beginning of the file
 173          * to the first byte in the section.
 174          */
 175         sh_offset = le64_to_cpu(sh_table[sh_index].sh_offset);
 176         sh_num = le16_to_cpu(header.e_shnum);
 177
 178         ret = fseek(felf, sh_offset, SEEK_SET);
 179         if (ret) {
 180                 fprintf(stderr, "Setting up sh_offset failed\n");
 181                 free(sh_str);
 182                 free(sh_table);
 183                 fclose(felf);
 184                 return 29;
 185         }
 186
 187         size = fread(sh_str, 1, sh_size, felf);
 188         if (size != sh_size) {
 189                 fprintf(stderr, "%s: Can't read section: %lx/%lx\n",
 190                         argv[0], size, sh_size);
 191                 free(sh_str);
 192                 free(sh_table);
 193                 fclose(felf);
 194                 return 30;
 195         }
 196
 197         for (i = 0; i < sh_num; i++) {
 198                 char *sh_name = sh_str + le32_to_cpu(sh_table[i].sh_name);
 199
 200                 debug("%s\n", sh_name);
 201
 202                 sh_addr = le64_to_cpu(sh_table[i].sh_addr);
 203                 sh_offset = le64_to_cpu(sh_table[i].sh_offset);
 204                 sh_size = le64_to_cpu(sh_table[i].sh_size);
 205
 206                 if (!strcmp(".rela.dyn", sh_name)) {
 207                         debug("Found section\t\".rela_dyn\"\n");
 208                         debug(" at addr\t0x%08x\n", sh_addr);
 209                         debug(" at offset\t0x%08x\n", sh_offset);
 210                         debug(" of size\t0x%08x\n", sh_size);
 211                         rela_start = sh_addr;
 212                         rela_end = rela_start + sh_size;
 213                         break;
 214                 }
 215         }
 216
 217         /* Clean up */
 218         free(sh_str);
 219         free(sh_table);
 220         fclose(felf);
 221
 222         debug("text_base\t0x%08lx\n", text_base);
 223         debug("rela_start\t0x%08lx\n", rela_start);
 224         debug("rela_end\t0x%08lx\n", rela_end);
 225
 226         if (!rela_start)
 227                 return 1;
 228
 229         return 0;
 230 }
 231
 232 static int decode_elf32(FILE *felf, char **argv)
 233 {
 234         size_t size;
 235         Elf32_Ehdr header;
 236         uint64_t section_header_base, section_header_size;
 237         uint32_t sh_addr, sh_offset, sh_size;
 238         Elf32_Half sh_index, sh_num;
 239         Elf32_Shdr *sh_table; /* Elf symbol table */
 240         int ret, i, machine;
 241         char *sh_str;
 242
 243         debug("32bit version\n");
 244
 245         /* Make sure we are at start */
 246         rewind(felf);
 247
 248         size = fread(&header, 1, sizeof(header), felf);
 249         if (size != sizeof(header)) {
 250                 fclose(felf);
 251                 return 25;
 252         }
 253
 254         machine = elf16_to_cpu(header.e_machine);
 255         debug("Machine %d\n", machine);
 256
 257         if (machine != EM_MICROBLAZE) {
 258                 fprintf(stderr, "%s: Not supported machine type\n", argv[0]);
 259                 return 30;
 260         }
 261
 262         text_base = elf32_to_cpu(header.e_entry);
 263         section_header_base = elf32_to_cpu(header.e_shoff);
 264         section_header_size = elf16_to_cpu(header.e_shentsize) *
 265                               elf16_to_cpu(header.e_shnum);
 266
 267         sh_table = malloc(section_header_size);
 268         if (!sh_table) {
 269                 fprintf(stderr, "%s: Cannot allocate space for section header\n",
 270                         argv[0]);
 271                 fclose(felf);
 272                 return 26;
 273         }
 274
 275         ret = fseek(felf, section_header_base, SEEK_SET);
 276         if (ret) {
 277                 fprintf(stderr, "%s: Can't set pointer to section header: %x/%lx\n",
 278                         argv[0], ret, section_header_base);
 279                 free(sh_table);
 280                 fclose(felf);
 281                 return 26;
 282         }
 283
 284         size = fread(sh_table, 1, section_header_size, felf);
 285         if (size != section_header_size) {
 286                 fprintf(stderr, "%s: Can't read section header: %lx/%lx\n",
 287                         argv[0], size, section_header_size);
 288                 free(sh_table);
 289                 fclose(felf);
 290                 return 27;
 291         }
 292
 293         sh_index = elf16_to_cpu(header.e_shstrndx);
 294         sh_size = elf32_to_cpu(sh_table[sh_index].sh_size);
 295         debug("e_shstrndx %x, sh_size %lx\n", sh_index, sh_size);
 296
 297         sh_str = malloc(sh_size);
 298         if (!sh_str) {
 299                 fprintf(stderr, "malloc failed\n");
 300                 free(sh_table);
 301                 fclose(felf);
 302                 return 28;
 303         }
 304
 305         /*
 306          * Specifies the byte offset from the beginning of the file
 307          * to the first byte in the section.
 308          */
 309         sh_offset = elf32_to_cpu(sh_table[sh_index].sh_offset);
 310         sh_num = elf16_to_cpu(header.e_shnum);
 311
 312         ret = fseek(felf, sh_offset, SEEK_SET);
 313         if (ret) {
 314                 fprintf(stderr, "Setting up sh_offset failed\n");
 315                 free(sh_str);
 316                 free(sh_table);
 317                 fclose(felf);
 318                 return 29;
 319         }
 320
 321         size = fread(sh_str, 1, sh_size, felf);
 322         if (size != sh_size) {
 323                 fprintf(stderr, "%s: Can't read section: %lx/%x\n",
 324                         argv[0], size, sh_size);
 325                 free(sh_str);
 326                 free(sh_table);
 327                 fclose(felf);
 328                 return 30;
 329         }
 330
 331         for (i = 0; i < sh_num; i++) {
 332                 char *sh_name = sh_str + elf32_to_cpu(sh_table[i].sh_name);
 333
 334                 debug("%s\n", sh_name);
 335
 336                 sh_addr = elf32_to_cpu(sh_table[i].sh_addr);
 337                 sh_offset = elf32_to_cpu(sh_table[i].sh_offset);
 338                 sh_size = elf32_to_cpu(sh_table[i].sh_size);
 339
 340                 if (!strcmp(".rela.dyn", sh_name)) {
 341                         debug("Found section\t\".rela_dyn\"\n");
 342                         debug(" at addr\t0x%08x\n", sh_addr);
 343                         debug(" at offset\t0x%08x\n", sh_offset);
 344                         debug(" of size\t0x%08x\n", sh_size);
 345                         rela_start = sh_addr;
 346                         rela_end = rela_start + sh_size;
 347                 }
 348                 if (!strcmp(".dynsym", sh_name)) {
 349                         debug("Found section\t\".dynsym\"\n");
 350                         debug(" at addr\t0x%08x\n", sh_addr);
 351                         debug(" at offset\t0x%08x\n", sh_offset);
 352                         debug(" of size\t0x%08x\n", sh_size);
 353                         dyn_start = sh_addr;
 354                 }
 355         }
 356
 357         /* Clean up */
 358         free(sh_str);
 359         free(sh_table);
 360         fclose(felf);
 361
 362         debug("text_base\t0x%08lx\n", text_base);
 363         debug("rela_start\t0x%08lx\n", rela_start);
 364         debug("rela_end\t0x%08lx\n", rela_end);
 365         debug("dyn_start\t0x%08lx\n", dyn_start);
 366
 367         if (!rela_start)
 368                 return 1;
 369
 370         return 0;
 371 }
 372
 373 static int decode_elf(char **argv)
 374 {
 375         FILE *felf;
 376         size_t size;
 377         unsigned char e_ident[EI_NIDENT];
 378
 379         felf = fopen(argv[2], "r+b");
 380         if (!felf) {
 381                 fprintf(stderr, "%s: Cannot open %s: %s\n",
 382                         argv[0], argv[5], strerror(errno));
 383                 return 2;
 384         }
 385
 386         size = fread(e_ident, 1, EI_NIDENT, felf);
 387         if (size != EI_NIDENT) {
 388                 fclose(felf);
 389                 return 25;
 390         }
 391
 392         /* Check if this is really ELF file */
 393         if (e_ident[0] != 0x7f &&
 394             e_ident[1] != 'E' &&
 395             e_ident[2] != 'L' &&
 396             e_ident[3] != 'F') {
 397                 fclose(felf);
 398                 return 1;
 399         }
 400
 401         ei_class = e_ident[4];
 402         debug("EI_CLASS(1=32bit, 2=64bit) %d\n", ei_class);
 403
 404         ei_data = e_ident[5];
 405         debug("EI_DATA(1=little endian, 2=big endian) %d\n", ei_data);
 406
 407         if (ei_class == 2)
 408                 return decode_elf64(felf, argv);
 409
 410         return decode_elf32(felf, argv);
 411 }
 412
 413 static int rela_elf64(char **argv, FILE *f)
 414 {
 415         int i, num;
 416
 417         if ((rela_end - rela_start) % sizeof(Elf64_Rela)) {
 418                 fprintf(stderr, "%s: rela size isn't a multiple of Elf64_Rela\n", argv[0]);
 419                 return 3;
 420         }
 421
 422         num = (rela_end - rela_start) / sizeof(Elf64_Rela);
 423
 424         for (i = 0; i < num; i++) {
 425                 Elf64_Rela rela, swrela;
 426                 uint64_t pos = rela_start + sizeof(Elf64_Rela) * i;
 427                 uint64_t addr;
 428
 429                 if (fseek(f, pos, SEEK_SET) < 0) {
 430                         fprintf(stderr, "%s: %s: seek to %" PRIx64
 431                                         " failed: %s\n",
 432                                 argv[0], argv[1], pos, strerror(errno));
 433                 }
 434
 435                 if (fread(&rela, sizeof(rela), 1, f) != 1) {
 436                         fprintf(stderr, "%s: %s: read rela failed at %"
 437                                         PRIx64 "\n",
 438                                 argv[0], argv[1], pos);
 439                         return 4;
 440                 }
 441
 442                 swrela.r_offset = le64_to_cpu(rela.r_offset);
 443                 swrela.r_info = le64_to_cpu(rela.r_info);
 444                 swrela.r_addend = le64_to_cpu(rela.r_addend);
 445
 446                 if (!supported_rela(&swrela))
 447                         continue;
 448
 449                 debug("Rela %" PRIx64 " %" PRIu64 " %" PRIx64 "\n",
 450                       swrela.r_offset, swrela.r_info, swrela.r_addend);
 451
 452                 if (swrela.r_offset < text_base) {
 453                         fprintf(stderr, "%s: %s: bad rela at %" PRIx64 "\n",
 454                                 argv[0], argv[1], pos);
 455                         return 4;
 456                 }
 457
 458                 addr = swrela.r_offset - text_base;
 459
 460                 if (fseek(f, addr, SEEK_SET) < 0) {
 461                         fprintf(stderr, "%s: %s: seek to %"
 462                                         PRIx64 " failed: %s\n",
 463                                 argv[0], argv[1], addr, strerror(errno));
 464                 }
 465
 466                 if (fwrite(&rela.r_addend, sizeof(rela.r_addend), 1, f) != 1) {
 467                         fprintf(stderr, "%s: %s: write failed at %" PRIx64 "\n",
 468                                 argv[0], argv[1], addr);
 469                         return 4;
 470                 }
 471         }
 472
 473         return 0;
 474 }
 475
 476 static bool supported_rela32(Elf32_Rela *rela, uint32_t *type)
 477 {
 478         uint32_t mask = 0xffULL; /* would be different on 32-bit */
 479         *type = rela->r_info & mask;
 480
 481         debug("Type:\t");
 482
 483         switch (*type) {
 484         case R_MICROBLAZE_32:
 485                 debug("R_MICROBLAZE_32\n");
 486                 return true;
 487         case R_MICROBLAZE_GLOB_DAT:
 488                 debug("R_MICROBLAZE_GLOB_DAT\n");
 489                 return true;
 490         case R_MICROBLAZE_NONE:
 491                 debug("R_MICROBLAZE_NONE - ignoring - do nothing\n");
 492                 return false;
 493         case R_MICROBLAZE_REL:
 494                 debug("R_MICROBLAZE_REL\n");
 495                 return true;
 496         default:
 497                 fprintf(stderr, "warning: unsupported relocation type %"
 498                         PRIu32 " at %" PRIx32 "\n", *type, rela->r_offset);
 499
 500                 return false;
 501         }
 502 }
 503
 504 static int rela_elf32(char **argv, FILE *f)
 505 {
 506         int i, num, index;
 507         uint32_t value, type;
 508
 509         if ((rela_end - rela_start) % sizeof(Elf32_Rela)) {
 510                 fprintf(stderr, "%s: rela size isn't a multiple of Elf32_Rela\n", argv[0]);
 511                 return 3;
 512         }
 513
 514         num = (rela_end - rela_start) / sizeof(Elf32_Rela);
 515
 516         debug("Number of entries: %u\n", num);
 517
 518         for (i = 0; i < num; i++) {
 519                 Elf32_Rela rela, swrela;
 520                 Elf32_Sym symbols;
 521                 uint32_t pos = rela_start + sizeof(Elf32_Rela) * i;
 522                 uint32_t addr, pos_dyn;
 523
 524                 debug("\nPosition:\t%d/0x%x\n", i, pos);
 525
 526                 if (fseek(f, pos, SEEK_SET) < 0) {
 527                         fprintf(stderr, "%s: %s: seek to %" PRIx32
 528                                         " failed: %s\n",
 529                                 argv[0], argv[1], pos, strerror(errno));
 530                 }
 531
 532                 if (fread(&rela, sizeof(rela), 1, f) != 1) {
 533                         fprintf(stderr, "%s: %s: read rela failed at %"
 534                                         PRIx32 "\n",
 535                                 argv[0], argv[1], pos);
 536                         return 4;
 537                 }
 538
 539                 debug("Rela:\toffset:\t%" PRIx32 " r_info:\t%"
 540                       PRIu32 " r_addend:\t%" PRIx32 "\n",
 541                       rela.r_offset, rela.r_info, rela.r_addend);
 542
 543                 swrela.r_offset = elf32_to_cpu(rela.r_offset);
 544                 swrela.r_info = elf32_to_cpu(rela.r_info);
 545                 swrela.r_addend = elf32_to_cpu(rela.r_addend);
 546
 547                 debug("SWRela:\toffset:\t%" PRIx32 " r_info:\t%"
 548                       PRIu32 " r_addend:\t%" PRIx32 "\n",
 549                       swrela.r_offset, swrela.r_info, swrela.r_addend);
 550
 551                 if (!supported_rela32(&swrela, &type))
 552                         continue;
 553
 554                 if (swrela.r_offset < text_base) {
 555                         fprintf(stderr, "%s: %s: bad rela at %" PRIx32 "\n",
 556                                 argv[0], argv[1], pos);
 557                         return 4;
 558                 }
 559
 560                 addr = swrela.r_offset - text_base;
 561
 562                 debug("Addr:\t0x%" PRIx32 "\n", addr);
 563
 564                 switch (type) {
 565                 case R_MICROBLAZE_REL:
 566                         if (fseek(f, addr, SEEK_SET) < 0) {
 567                                 fprintf(stderr, "%s: %s: seek to %"
 568                                         PRIx32 " failed: %s\n",
 569                                         argv[0], argv[1], addr, strerror(errno));
 570                                 return 5;
 571                         }
 572
 573                         debug("Write addend\n");
 574
 575                         if (fwrite(&rela.r_addend, sizeof(rela.r_addend), 1, f) != 1) {
 576                                 fprintf(stderr, "%s: %s: write failed at %" PRIx32 "\n",
 577                                         argv[0], argv[1], addr);
 578                                 return 4;
 579                         }
 580                         break;
 581                 case R_MICROBLAZE_32:
 582                 case R_MICROBLAZE_GLOB_DAT:
 583                         /* global symbols read it and add reloc offset */
 584                         index = swrela.r_info >> 8;
 585                         pos_dyn = dyn_start + sizeof(Elf32_Sym) * index;
 586
 587                         debug("Index:\t%d\n", index);
 588                         debug("Pos_dyn:\t0x%x\n", pos_dyn);
 589
 590                         if (fseek(f, pos_dyn, SEEK_SET) < 0) {
 591                                 fprintf(stderr, "%s: %s: seek to %"
 592                                         PRIx32 " failed: %s\n",
 593                                         argv[0], argv[1], pos_dyn, strerror(errno));
 594                                 return 5;
 595                         }
 596
 597                         if (fread(&symbols, sizeof(symbols), 1, f) != 1) {
 598                                 fprintf(stderr, "%s: %s: read symbols failed at %"
 599                                                 PRIx32 "\n",
 600                                         argv[0], argv[1], pos_dyn);
 601                                 return 4;
 602                         }
 603
 604                         debug("Symbol description:\n");
 605                         debug(" st_name:\t0x%x\n", symbols.st_name);
 606                         debug(" st_value:\t0x%x\n", symbols.st_value);
 607                         debug(" st_size:\t0x%x\n", symbols.st_size);
 608
 609                         value = swrela.r_addend + symbols.st_value;
 610
 611                         debug("Value:\t0x%x\n", value);
 612
 613                         if (fseek(f, addr, SEEK_SET) < 0) {
 614                                 fprintf(stderr, "%s: %s: seek to %"
 615                                         PRIx32 " failed: %s\n",
 616                                         argv[0], argv[1], addr, strerror(errno));
 617                                 return 5;
 618                         }
 619
 620                         if (fwrite(&value, sizeof(rela.r_addend), 1, f) != 1) {
 621                                 fprintf(stderr, "%s: %s: write failed at %" PRIx32 "\n",
 622                                         argv[0], argv[1], addr);
 623                                 return 4;
 624                         }
 625
 626                         break;
 627                 case R_MICROBLAZE_NONE:
 628                         debug("R_MICROBLAZE_NONE - skip\n");
 629                         break;
 630                 default:
 631                         fprintf(stderr, "warning: unsupported relocation type %"
 632                                 PRIu32 " at %" PRIx32 "\n",
 633                                 type, rela.r_offset);
 634                 }
 635         }
 636
 637         return 0;
 638 }
 639
 640 int main(int argc, char **argv)
 641 {
 642         FILE *f;
 643         int ret;
 644         uint64_t file_size;
 645
 646         if (argc != 3) {
 647                 fprintf(stderr, "Statically apply ELF rela relocations\n");
 648                 fprintf(stderr, "Usage: %s <bin file> <u-boot ELF>\n",
 649                         argv[0]);
 650                 return 1;
 651         }
 652
 653         ret = decode_elf(argv);
 654         if (ret) {
 655                 fprintf(stderr, "ELF decoding failed\n");
 656                 return ret;
 657         }
 658
 659         if (rela_start > rela_end || rela_start < text_base) {
 660                 fprintf(stderr, "%s: bad rela bounds\n", argv[0]);
 661                 return 3;
 662         }
 663
 664         rela_start -= text_base;
 665         rela_end -= text_base;
 666         dyn_start -= text_base;
 667
 668         f = fopen(argv[1], "r+b");
 669         if (!f) {
 670                 fprintf(stderr, "%s: Cannot open %s: %s\n",
 671                         argv[0], argv[1], strerror(errno));
 672                 return 2;
 673         }
 674
 675         fseek(f, 0, SEEK_END);
 676         file_size = ftell(f);
 677         rewind(f);
 678
 679         if (rela_end > file_size) {
 680                 // Most likely compiler inserted some section that didn't get
 681                 // objcopy-ed into the final binary
 682                 rela_end = file_size;
 683         }
 684
 685         if (ei_class == 2)
 686                 ret = rela_elf64(argv, f);
 687         else
 688                 ret = rela_elf32(argv, f);
 689
 690         if (fclose(f) < 0) {
 691                 fprintf(stderr, "%s: %s: close failed: %s\n",
 692                         argv[0], argv[1], strerror(errno));
 693                 return 4;
 694         }
 695
 696         return ret;
 697 }