arch/i386/boot/compressed/relocs.c

   1 #include <stdio.h>
   2 #include <stdarg.h>
   3 #include <stdlib.h>
   4 #include <stdint.h>
   5 #include <string.h>
   6 #include <errno.h>
   7 #include <unistd.h>
   8 #include <elf.h>
   9 #include <byteswap.h>
  10 #define USE_BSD
  11 #include <endian.h>
  12
  13 #define MAX_SHDRS 100
  14 static Elf32_Ehdr ehdr;
  15 static Elf32_Shdr shdr[MAX_SHDRS];
  16 static Elf32_Sym  *symtab[MAX_SHDRS];
  17 static Elf32_Rel  *reltab[MAX_SHDRS];
  18 static char *strtab[MAX_SHDRS];
  19 static unsigned long reloc_count, reloc_idx;
  20 static unsigned long *relocs;
  21
  22 /*
  23  * Following symbols have been audited. There values are constant and do
  24  * not change if bzImage is loaded at a different physical address than
  25  * the address for which it has been compiled. Don't warn user about
  26  * absolute relocations present w.r.t these symbols.
  27  */
  28 static const char* safe_abs_relocs[] = {
  29                 "__kernel_vsyscall",
  30                 "__kernel_rt_sigreturn",
  31                 "__kernel_sigreturn",
  32                 "SYSENTER_RETURN",
  33 };
  34
  35 static int is_safe_abs_reloc(const char* sym_name)
  36 {
  37         int i, array_size;
  38
  39         array_size = sizeof(safe_abs_relocs)/sizeof(char*);
  40
  41         for(i = 0; i < array_size; i++) {
  42                 if (!strcmp(sym_name, safe_abs_relocs[i]))
  43                         /* Match found */
  44                         return 1;
  45         }
  46         return 0;
  47 }
  48
  49 static void die(char *fmt, ...)
  50 {
  51         va_list ap;
  52         va_start(ap, fmt);
  53         vfprintf(stderr, fmt, ap);
  54         va_end(ap);
  55         exit(1);
  56 }
  57
  58 static const char *sym_type(unsigned type)
  59 {
  60         static const char *type_name[] = {
  61 #define SYM_TYPE(X) [X] = #X
  62                 SYM_TYPE(STT_NOTYPE),
  63                 SYM_TYPE(STT_OBJECT),
  64                 SYM_TYPE(STT_FUNC),
  65                 SYM_TYPE(STT_SECTION),
  66                 SYM_TYPE(STT_FILE),
  67                 SYM_TYPE(STT_COMMON),
  68                 SYM_TYPE(STT_TLS),
  69 #undef SYM_TYPE
  70         };
  71         const char *name = "unknown sym type name";
  72         if (type < sizeof(type_name)/sizeof(type_name[0])) {
  73                 name = type_name[type];
  74         }
  75         return name;
  76 }
  77
  78 static const char *sym_bind(unsigned bind)
  79 {
  80         static const char *bind_name[] = {
  81 #define SYM_BIND(X) [X] = #X
  82                 SYM_BIND(STB_LOCAL),
  83                 SYM_BIND(STB_GLOBAL),
  84                 SYM_BIND(STB_WEAK),
  85 #undef SYM_BIND
  86         };
  87         const char *name = "unknown sym bind name";
  88         if (bind < sizeof(bind_name)/sizeof(bind_name[0])) {
  89                 name = bind_name[bind];
  90         }
  91         return name;
  92 }
  93
  94 static const char *sym_visibility(unsigned visibility)
  95 {
  96         static const char *visibility_name[] = {
  97 #define SYM_VISIBILITY(X) [X] = #X
  98                 SYM_VISIBILITY(STV_DEFAULT),
  99                 SYM_VISIBILITY(STV_INTERNAL),
 100                 SYM_VISIBILITY(STV_HIDDEN),
 101                 SYM_VISIBILITY(STV_PROTECTED),
 102 #undef SYM_VISIBILITY
 103         };
 104         const char *name = "unknown sym visibility name";
 105         if (visibility < sizeof(visibility_name)/sizeof(visibility_name[0])) {
 106                 name = visibility_name[visibility];
 107         }
 108         return name;
 109 }
 110
 111 static const char *rel_type(unsigned type)
 112 {
 113         static const char *type_name[] = {
 114 #define REL_TYPE(X) [X] = #X
 115                 REL_TYPE(R_386_NONE),
 116                 REL_TYPE(R_386_32),
 117                 REL_TYPE(R_386_PC32),
 118                 REL_TYPE(R_386_GOT32),
 119                 REL_TYPE(R_386_PLT32),
 120                 REL_TYPE(R_386_COPY),
 121                 REL_TYPE(R_386_GLOB_DAT),
 122                 REL_TYPE(R_386_JMP_SLOT),
 123                 REL_TYPE(R_386_RELATIVE),
 124                 REL_TYPE(R_386_GOTOFF),
 125                 REL_TYPE(R_386_GOTPC),
 126 #undef REL_TYPE
 127         };
 128         const char *name = "unknown type rel type name";
 129         if (type < sizeof(type_name)/sizeof(type_name[0])) {
 130                 name = type_name[type];
 131         }
 132         return name;
 133 }
 134
 135 static const char *sec_name(unsigned shndx)
 136 {
 137         const char *sec_strtab;
 138         const char *name;
 139         sec_strtab = strtab[ehdr.e_shstrndx];
 140         name = "<noname>";
 141         if (shndx < ehdr.e_shnum) {
 142                 name = sec_strtab + shdr[shndx].sh_name;
 143         }
 144         else if (shndx == SHN_ABS) {
 145                 name = "ABSOLUTE";
 146         }
 147         else if (shndx == SHN_COMMON) {
 148                 name = "COMMON";
 149         }
 150         return name;
 151 }
 152
 153 static const char *sym_name(const char *sym_strtab, Elf32_Sym *sym)
 154 {
 155         const char *name;
 156         name = "<noname>";
 157         if (sym->st_name) {
 158                 name = sym_strtab + sym->st_name;
 159         }
 160         else {
 161                 name = sec_name(shdr[sym->st_shndx].sh_name);
 162         }
 163         return name;
 164 }
 165
 166
 167
 168 #if BYTE_ORDER == LITTLE_ENDIAN
 169 #define le16_to_cpu(val) (val)
 170 #define le32_to_cpu(val) (val)
 171 #endif
 172 #if BYTE_ORDER == BIG_ENDIAN
 173 #define le16_to_cpu(val) bswap_16(val)
 174 #define le32_to_cpu(val) bswap_32(val)
 175 #endif
 176
 177 static uint16_t elf16_to_cpu(uint16_t val)
 178 {
 179         return le16_to_cpu(val);
 180 }
 181
 182 static uint32_t elf32_to_cpu(uint32_t val)
 183 {
 184         return le32_to_cpu(val);
 185 }
 186
 187 static void read_ehdr(FILE *fp)
 188 {
 189         if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1) {
 190                 die("Cannot read ELF header: %s\n",
 191                         strerror(errno));
 192         }
 193         if (memcmp(ehdr.e_ident, ELFMAG, 4) != 0) {
 194                 die("No ELF magic\n");
 195         }
 196         if (ehdr.e_ident[EI_CLASS] != ELFCLASS32) {
 197                 die("Not a 32 bit executable\n");
 198         }
 199         if (ehdr.e_ident[EI_DATA] != ELFDATA2LSB) {
 200                 die("Not a LSB ELF executable\n");
 201         }
 202         if (ehdr.e_ident[EI_VERSION] != EV_CURRENT) {
 203                 die("Unknown ELF version\n");
 204         }
 205         /* Convert the fields to native endian */
 206         ehdr.e_type      = elf16_to_cpu(ehdr.e_type);
 207         ehdr.e_machine   = elf16_to_cpu(ehdr.e_machine);
 208         ehdr.e_version   = elf32_to_cpu(ehdr.e_version);
 209         ehdr.e_entry     = elf32_to_cpu(ehdr.e_entry);
 210         ehdr.e_phoff     = elf32_to_cpu(ehdr.e_phoff);
 211         ehdr.e_shoff     = elf32_to_cpu(ehdr.e_shoff);
 212         ehdr.e_flags     = elf32_to_cpu(ehdr.e_flags);
 213         ehdr.e_ehsize    = elf16_to_cpu(ehdr.e_ehsize);
 214         ehdr.e_phentsize = elf16_to_cpu(ehdr.e_phentsize);
 215         ehdr.e_phnum     = elf16_to_cpu(ehdr.e_phnum);
 216         ehdr.e_shentsize = elf16_to_cpu(ehdr.e_shentsize);
 217         ehdr.e_shnum     = elf16_to_cpu(ehdr.e_shnum);
 218         ehdr.e_shstrndx  = elf16_to_cpu(ehdr.e_shstrndx);
 219
 220         if ((ehdr.e_type != ET_EXEC) && (ehdr.e_type != ET_DYN)) {
 221                 die("Unsupported ELF header type\n");
 222         }
 223         if (ehdr.e_machine != EM_386) {
 224                 die("Not for x86\n");
 225         }
 226         if (ehdr.e_version != EV_CURRENT) {
 227                 die("Unknown ELF version\n");
 228         }
 229         if (ehdr.e_ehsize != sizeof(Elf32_Ehdr)) {
 230                 die("Bad Elf header size\n");
 231         }
 232         if (ehdr.e_phentsize != sizeof(Elf32_Phdr)) {
 233                 die("Bad program header entry\n");
 234         }
 235         if (ehdr.e_shentsize != sizeof(Elf32_Shdr)) {
 236                 die("Bad section header entry\n");
 237         }
 238         if (ehdr.e_shstrndx >= ehdr.e_shnum) {
 239                 die("String table index out of bounds\n");
 240         }
 241 }
 242
 243 static void read_shdrs(FILE *fp)
 244 {
 245         int i;
 246         if (ehdr.e_shnum > MAX_SHDRS) {
 247                 die("%d section headers supported: %d\n",
 248                         ehdr.e_shnum, MAX_SHDRS);
 249         }
 250         if (fseek(fp, ehdr.e_shoff, SEEK_SET) < 0) {
 251                 die("Seek to %d failed: %s\n",
 252                         ehdr.e_shoff, strerror(errno));
 253         }
 254         if (fread(&shdr, sizeof(shdr[0]), ehdr.e_shnum, fp) != ehdr.e_shnum) {
 255                 die("Cannot read ELF section headers: %s\n",
 256                         strerror(errno));
 257         }
 258         for(i = 0; i < ehdr.e_shnum; i++) {
 259                 shdr[i].sh_name      = elf32_to_cpu(shdr[i].sh_name);
 260                 shdr[i].sh_type      = elf32_to_cpu(shdr[i].sh_type);
 261                 shdr[i].sh_flags     = elf32_to_cpu(shdr[i].sh_flags);
 262                 shdr[i].sh_addr      = elf32_to_cpu(shdr[i].sh_addr);
 263                 shdr[i].sh_offset    = elf32_to_cpu(shdr[i].sh_offset);
 264                 shdr[i].sh_size      = elf32_to_cpu(shdr[i].sh_size);
 265                 shdr[i].sh_link      = elf32_to_cpu(shdr[i].sh_link);
 266                 shdr[i].sh_info      = elf32_to_cpu(shdr[i].sh_info);
 267                 shdr[i].sh_addralign = elf32_to_cpu(shdr[i].sh_addralign);
 268                 shdr[i].sh_entsize   = elf32_to_cpu(shdr[i].sh_entsize);
 269         }
 270
 271 }
 272
 273 static void read_strtabs(FILE *fp)
 274 {
 275         int i;
 276         for(i = 0; i < ehdr.e_shnum; i++) {
 277                 if (shdr[i].sh_type != SHT_STRTAB) {
 278                         continue;
 279                 }
 280                 strtab[i] = malloc(shdr[i].sh_size);
 281                 if (!strtab[i]) {
 282                         die("malloc of %d bytes for strtab failed\n",
 283                                 shdr[i].sh_size);
 284                 }
 285                 if (fseek(fp, shdr[i].sh_offset, SEEK_SET) < 0) {
 286                         die("Seek to %d failed: %s\n",
 287                                 shdr[i].sh_offset, strerror(errno));
 288                 }
 289                 if (fread(strtab[i], 1, shdr[i].sh_size, fp) != shdr[i].sh_size) {
 290                         die("Cannot read symbol table: %s\n",
 291                                 strerror(errno));
 292                 }
 293         }
 294 }
 295
 296 static void read_symtabs(FILE *fp)
 297 {
 298         int i,j;
 299         for(i = 0; i < ehdr.e_shnum; i++) {
 300                 if (shdr[i].sh_type != SHT_SYMTAB) {
 301                         continue;
 302                 }
 303                 symtab[i] = malloc(shdr[i].sh_size);
 304                 if (!symtab[i]) {
 305                         die("malloc of %d bytes for symtab failed\n",
 306                                 shdr[i].sh_size);
 307                 }
 308                 if (fseek(fp, shdr[i].sh_offset, SEEK_SET) < 0) {
 309                         die("Seek to %d failed: %s\n",
 310                                 shdr[i].sh_offset, strerror(errno));
 311                 }
 312                 if (fread(symtab[i], 1, shdr[i].sh_size, fp) != shdr[i].sh_size) {
 313                         die("Cannot read symbol table: %s\n",
 314                                 strerror(errno));
 315                 }
 316                 for(j = 0; j < shdr[i].sh_size/sizeof(symtab[i][0]); j++) {
 317                         symtab[i][j].st_name  = elf32_to_cpu(symtab[i][j].st_name);
 318                         symtab[i][j].st_value = elf32_to_cpu(symtab[i][j].st_value);
 319                         symtab[i][j].st_size  = elf32_to_cpu(symtab[i][j].st_size);
 320                         symtab[i][j].st_shndx = elf16_to_cpu(symtab[i][j].st_shndx);
 321                 }
 322         }
 323 }
 324
 325
 326 static void read_relocs(FILE *fp)
 327 {
 328         int i,j;
 329         for(i = 0; i < ehdr.e_shnum; i++) {
 330                 if (shdr[i].sh_type != SHT_REL) {
 331                         continue;
 332                 }
 333                 reltab[i] = malloc(shdr[i].sh_size);
 334                 if (!reltab[i]) {
 335                         die("malloc of %d bytes for relocs failed\n",
 336                                 shdr[i].sh_size);
 337                 }
 338                 if (fseek(fp, shdr[i].sh_offset, SEEK_SET) < 0) {
 339                         die("Seek to %d failed: %s\n",
 340                                 shdr[i].sh_offset, strerror(errno));
 341                 }
 342                 if (fread(reltab[i], 1, shdr[i].sh_size, fp) != shdr[i].sh_size) {
 343                         die("Cannot read symbol table: %s\n",
 344                                 strerror(errno));
 345                 }
 346                 for(j = 0; j < shdr[i].sh_size/sizeof(reltab[0][0]); j++) {
 347                         reltab[i][j].r_offset = elf32_to_cpu(reltab[i][j].r_offset);
 348                         reltab[i][j].r_info   = elf32_to_cpu(reltab[i][j].r_info);
 349                 }
 350         }
 351 }
 352
 353
 354 static void print_absolute_symbols(void)
 355 {
 356         int i;
 357         printf("Absolute symbols\n");
 358         printf(" Num:    Value Size  Type       Bind        Visibility  Name\n");
 359         for(i = 0; i < ehdr.e_shnum; i++) {
 360                 char *sym_strtab;
 361                 Elf32_Sym *sh_symtab;
 362                 int j;
 363                 if (shdr[i].sh_type != SHT_SYMTAB) {
 364                         continue;
 365                 }
 366                 sh_symtab = symtab[i];
 367                 sym_strtab = strtab[shdr[i].sh_link];
 368                 for(j = 0; j < shdr[i].sh_size/sizeof(symtab[0][0]); j++) {
 369                         Elf32_Sym *sym;
 370                         const char *name;
 371                         sym = &symtab[i][j];
 372                         name = sym_name(sym_strtab, sym);
 373                         if (sym->st_shndx != SHN_ABS) {
 374                                 continue;
 375                         }
 376                         printf("%5d %08x %5d %10s %10s %12s %s\n",
 377                                 j, sym->st_value, sym->st_size,
 378                                 sym_type(ELF32_ST_TYPE(sym->st_info)),
 379                                 sym_bind(ELF32_ST_BIND(sym->st_info)),
 380                                 sym_visibility(ELF32_ST_VISIBILITY(sym->st_other)),
 381                                 name);
 382                 }
 383         }
 384         printf("\n");
 385 }
 386
 387 static void print_absolute_relocs(void)
 388 {
 389         int i, printed = 0;
 390
 391         for(i = 0; i < ehdr.e_shnum; i++) {
 392                 char *sym_strtab;
 393                 Elf32_Sym *sh_symtab;
 394                 unsigned sec_applies, sec_symtab;
 395                 int j;
 396                 if (shdr[i].sh_type != SHT_REL) {
 397                         continue;
 398                 }
 399                 sec_symtab  = shdr[i].sh_link;
 400                 sec_applies = shdr[i].sh_info;
 401                 if (!(shdr[sec_applies].sh_flags & SHF_ALLOC)) {
 402                         continue;
 403                 }
 404                 sh_symtab = symtab[sec_symtab];
 405                 sym_strtab = strtab[shdr[sec_symtab].sh_link];
 406                 for(j = 0; j < shdr[i].sh_size/sizeof(reltab[0][0]); j++) {
 407                         Elf32_Rel *rel;
 408                         Elf32_Sym *sym;
 409                         const char *name;
 410                         rel = &reltab[i][j];
 411                         sym = &sh_symtab[ELF32_R_SYM(rel->r_info)];
 412                         name = sym_name(sym_strtab, sym);
 413                         if (sym->st_shndx != SHN_ABS) {
 414                                 continue;
 415                         }
 416
 417                         /* Absolute symbols are not relocated if bzImage is
 418                          * loaded at a non-compiled address. Display a warning
 419                          * to user at compile time about the absolute
 420                          * relocations present.
 421                          *
 422                          * User need to audit the code to make sure
 423                          * some symbols which should have been section
 424                          * relative have not become absolute because of some
 425                          * linker optimization or wrong programming usage.
 426                          *
 427                          * Before warning check if this absolute symbol
 428                          * relocation is harmless.
 429                          */
 430                         if (is_safe_abs_reloc(name))
 431                                 continue;
 432
 433                         if (!printed) {
 434                                 printf("WARNING: Absolute relocations"
 435                                         " present\n");
 436                                 printf("Offset     Info     Type     Sym.Value "
 437                                         "Sym.Name\n");
 438                                 printed = 1;
 439                         }
 440
 441                         printf("%08x %08x %10s %08x  %s\n",
 442                                 rel->r_offset,
 443                                 rel->r_info,
 444                                 rel_type(ELF32_R_TYPE(rel->r_info)),
 445                                 sym->st_value,
 446                                 name);
 447                 }
 448         }
 449
 450         if (printed)
 451                 printf("\n");
 452 }
 453
 454 static void walk_relocs(void (*visit)(Elf32_Rel *rel, Elf32_Sym *sym))
 455 {
 456         int i;
 457         /* Walk through the relocations */
 458         for(i = 0; i < ehdr.e_shnum; i++) {
 459                 char *sym_strtab;
 460                 Elf32_Sym *sh_symtab;
 461                 unsigned sec_applies, sec_symtab;
 462                 int j;
 463                 if (shdr[i].sh_type != SHT_REL) {
 464                         continue;
 465                 }
 466                 sec_symtab  = shdr[i].sh_link;
 467                 sec_applies = shdr[i].sh_info;
 468                 if (!(shdr[sec_applies].sh_flags & SHF_ALLOC)) {
 469                         continue;
 470                 }
 471                 sh_symtab = symtab[sec_symtab];
 472                 sym_strtab = strtab[shdr[sec_symtab].sh_link];
 473                 for(j = 0; j < shdr[i].sh_size/sizeof(reltab[0][0]); j++) {
 474                         Elf32_Rel *rel;
 475                         Elf32_Sym *sym;
 476                         unsigned r_type;
 477                         rel = &reltab[i][j];
 478                         sym = &sh_symtab[ELF32_R_SYM(rel->r_info)];
 479                         r_type = ELF32_R_TYPE(rel->r_info);
 480                         /* Don't visit relocations to absolute symbols */
 481                         if (sym->st_shndx == SHN_ABS) {
 482                                 continue;
 483                         }
 484                         if (r_type == R_386_PC32) {
 485                                 /* PC relative relocations don't need to be adjusted */
 486                         }
 487                         else if (r_type == R_386_32) {
 488                                 /* Visit relocations that need to be adjusted */
 489                                 visit(rel, sym);
 490                         }
 491                         else {
 492                                 die("Unsupported relocation type: %d\n", r_type);
 493                         }
 494                 }
 495         }
 496 }
 497
 498 static void count_reloc(Elf32_Rel *rel, Elf32_Sym *sym)
 499 {
 500         reloc_count += 1;
 501 }
 502
 503 static void collect_reloc(Elf32_Rel *rel, Elf32_Sym *sym)
 504 {
 505         /* Remember the address that needs to be adjusted. */
 506         relocs[reloc_idx++] = rel->r_offset;
 507 }
 508
 509 static int cmp_relocs(const void *va, const void *vb)
 510 {
 511         const unsigned long *a, *b;
 512         a = va; b = vb;
 513         return (*a == *b)? 0 : (*a > *b)? 1 : -1;
 514 }
 515
 516 static void emit_relocs(int as_text)
 517 {
 518         int i;
 519         /* Count how many relocations I have and allocate space for them. */
 520         reloc_count = 0;
 521         walk_relocs(count_reloc);
 522         relocs = malloc(reloc_count * sizeof(relocs[0]));
 523         if (!relocs) {
 524                 die("malloc of %d entries for relocs failed\n",
 525                         reloc_count);
 526         }
 527         /* Collect up the relocations */
 528         reloc_idx = 0;
 529         walk_relocs(collect_reloc);
 530
 531         /* Order the relocations for more efficient processing */
 532         qsort(relocs, reloc_count, sizeof(relocs[0]), cmp_relocs);
 533
 534         /* Print the relocations */
 535         if (as_text) {
 536                 /* Print the relocations in a form suitable that
 537                  * gas will like.
 538                  */
 539                 printf(".section \".data.reloc\",\"a\"\n");
 540                 printf(".balign 4\n");
 541                 for(i = 0; i < reloc_count; i++) {
 542                         printf("\t .long 0x%08lx\n", relocs[i]);
 543                 }
 544                 printf("\n");
 545         }
 546         else {
 547                 unsigned char buf[4];
 548                 buf[0] = buf[1] = buf[2] = buf[3] = 0;
 549                 /* Print a stop */
 550                 printf("%c%c%c%c", buf[0], buf[1], buf[2], buf[3]);
 551                 /* Now print each relocation */
 552                 for(i = 0; i < reloc_count; i++) {
 553                         buf[0] = (relocs[i] >>  0) & 0xff;
 554                         buf[1] = (relocs[i] >>  8) & 0xff;
 555                         buf[2] = (relocs[i] >> 16) & 0xff;
 556                         buf[3] = (relocs[i] >> 24) & 0xff;
 557                         printf("%c%c%c%c", buf[0], buf[1], buf[2], buf[3]);
 558                 }
 559         }
 560 }
 561
 562 static void usage(void)
 563 {
 564         die("relocs [--abs-syms |--abs-relocs | --text] vmlinux\n");
 565 }
 566
 567 int main(int argc, char **argv)
 568 {
 569         int show_absolute_syms, show_absolute_relocs;
 570         int as_text;
 571         const char *fname;
 572         FILE *fp;
 573         int i;
 574
 575         show_absolute_syms = 0;
 576         show_absolute_relocs = 0;
 577         as_text = 0;
 578         fname = NULL;
 579         for(i = 1; i < argc; i++) {
 580                 char *arg = argv[i];
 581                 if (*arg == '-') {
 582                         if (strcmp(argv[1], "--abs-syms") == 0) {
 583                                 show_absolute_syms = 1;
 584                                 continue;
 585                         }
 586
 587                         if (strcmp(argv[1], "--abs-relocs") == 0) {
 588                                 show_absolute_relocs = 1;
 589                                 continue;
 590                         }
 591                         else if (strcmp(argv[1], "--text") == 0) {
 592                                 as_text = 1;
 593                                 continue;
 594                         }
 595                 }
 596                 else if (!fname) {
 597                         fname = arg;
 598                         continue;
 599                 }
 600                 usage();
 601         }
 602         if (!fname) {
 603                 usage();
 604         }
 605         fp = fopen(fname, "r");
 606         if (!fp) {
 607                 die("Cannot open %s: %s\n",
 608                         fname, strerror(errno));
 609         }
 610         read_ehdr(fp);
 611         read_shdrs(fp);
 612         read_strtabs(fp);
 613         read_symtabs(fp);
 614         read_relocs(fp);
 615         if (show_absolute_syms) {
 616                 print_absolute_symbols();
 617                 return 0;
 618         }
 619         if (show_absolute_relocs) {
 620                 print_absolute_relocs();
 621                 return 0;
 622         }
 623         emit_relocs(as_text);
 624         return 0;
 625 }