elfdump.c revision 109457
1/*- 2 * Copyright (c) 2001 Jake Burkholder 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/cdefs.h> 28__FBSDID("$FreeBSD: head/usr.bin/elfdump/elfdump.c 109457 2003-01-18 02:33:49Z marcel $"); 29 30#include <sys/types.h> 31#include <sys/elf32.h> 32#include <sys/elf64.h> 33#include <sys/mman.h> 34#include <sys/stat.h> 35#include <err.h> 36#include <fcntl.h> 37#include <stddef.h> 38#include <stdio.h> 39#include <stdlib.h> 40#include <string.h> 41#include <unistd.h> 42 43#define ED_DYN (1<<0) 44#define ED_EHDR (1<<1) 45#define ED_GOT (1<<2) 46#define ED_HASH (1<<3) 47#define ED_INTERP (1<<4) 48#define ED_NOTE (1<<5) 49#define ED_PHDR (1<<6) 50#define ED_REL (1<<7) 51#define ED_SHDR (1<<8) 52#define ED_SYMTAB (1<<9) 53#define ED_ALL ((1<<10)-1) 54 55#define elf_get_addr elf_get_quad 56#define elf_get_off elf_get_quad 57#define elf_get_size elf_get_quad 58 59enum elf_member { 60 D_TAG = 1, D_PTR, D_VAL, 61 62 E_CLASS, E_DATA, E_OSABI, E_TYPE, E_MACHINE, E_VERSION, E_ENTRY, 63 E_PHOFF, E_SHOFF, E_FLAGS, E_EHSIZE, E_PHENTSIZE, E_PHNUM, E_SHENTSIZE, 64 E_SHNUM, E_SHSTRNDX, 65 66 N_NAMESZ, N_DESCSZ, N_TYPE, 67 68 P_TYPE, P_OFFSET, P_VADDR, P_PADDR, P_FILESZ, P_MEMSZ, P_FLAGS, 69 P_ALIGN, 70 71 SH_NAME, SH_TYPE, SH_FLAGS, SH_ADDR, SH_OFFSET, SH_SIZE, SH_LINK, 72 SH_INFO, SH_ADDRALIGN, SH_ENTSIZE, 73 74 ST_NAME, ST_VALUE, ST_SIZE, ST_INFO, ST_SHNDX, 75 76 R_OFFSET, R_INFO, 77 78 RA_OFFSET, RA_INFO, RA_ADDEND 79}; 80 81typedef enum elf_member elf_member_t; 82 83int elf32_offsets[] = { 84 0, 85 86 offsetof(Elf32_Dyn, d_tag), offsetof(Elf32_Dyn, d_un.d_ptr), 87 offsetof(Elf32_Dyn, d_un.d_val), 88 89 offsetof(Elf32_Ehdr, e_ident[EI_CLASS]), 90 offsetof(Elf32_Ehdr, e_ident[EI_DATA]), 91 offsetof(Elf32_Ehdr, e_ident[EI_OSABI]), 92 offsetof(Elf32_Ehdr, e_type), offsetof(Elf32_Ehdr, e_machine), 93 offsetof(Elf32_Ehdr, e_version), offsetof(Elf32_Ehdr, e_entry), 94 offsetof(Elf32_Ehdr, e_phoff), offsetof(Elf32_Ehdr, e_shoff), 95 offsetof(Elf32_Ehdr, e_flags), offsetof(Elf32_Ehdr, e_ehsize), 96 offsetof(Elf32_Ehdr, e_phentsize), offsetof(Elf32_Ehdr, e_phnum), 97 offsetof(Elf32_Ehdr, e_shentsize), offsetof(Elf32_Ehdr, e_shnum), 98 offsetof(Elf32_Ehdr, e_shstrndx), 99 100 offsetof(Elf_Note, n_namesz), offsetof(Elf_Note, n_descsz), 101 offsetof(Elf_Note, n_type), 102 103 offsetof(Elf32_Phdr, p_type), offsetof(Elf32_Phdr, p_offset), 104 offsetof(Elf32_Phdr, p_vaddr), offsetof(Elf32_Phdr, p_paddr), 105 offsetof(Elf32_Phdr, p_filesz), offsetof(Elf32_Phdr, p_memsz), 106 offsetof(Elf32_Phdr, p_flags), offsetof(Elf32_Phdr, p_align), 107 108 offsetof(Elf32_Shdr, sh_name), offsetof(Elf32_Shdr, sh_type), 109 offsetof(Elf32_Shdr, sh_flags), offsetof(Elf32_Shdr, sh_addr), 110 offsetof(Elf32_Shdr, sh_offset), offsetof(Elf32_Shdr, sh_size), 111 offsetof(Elf32_Shdr, sh_link), offsetof(Elf32_Shdr, sh_info), 112 offsetof(Elf32_Shdr, sh_addralign), offsetof(Elf32_Shdr, sh_entsize), 113 114 offsetof(Elf32_Sym, st_name), offsetof(Elf32_Sym, st_value), 115 offsetof(Elf32_Sym, st_size), offsetof(Elf32_Sym, st_info), 116 offsetof(Elf32_Sym, st_shndx), 117 118 offsetof(Elf32_Rel, r_offset), offsetof(Elf32_Rel, r_info), 119 120 offsetof(Elf32_Rela, r_offset), offsetof(Elf32_Rela, r_info), 121 offsetof(Elf32_Rela, r_addend) 122}; 123 124int elf64_offsets[] = { 125 0, 126 127 offsetof(Elf64_Dyn, d_tag), offsetof(Elf64_Dyn, d_un.d_ptr), 128 offsetof(Elf64_Dyn, d_un.d_val), 129 130 offsetof(Elf32_Ehdr, e_ident[EI_CLASS]), 131 offsetof(Elf32_Ehdr, e_ident[EI_DATA]), 132 offsetof(Elf32_Ehdr, e_ident[EI_OSABI]), 133 offsetof(Elf64_Ehdr, e_type), offsetof(Elf64_Ehdr, e_machine), 134 offsetof(Elf64_Ehdr, e_version), offsetof(Elf64_Ehdr, e_entry), 135 offsetof(Elf64_Ehdr, e_phoff), offsetof(Elf64_Ehdr, e_shoff), 136 offsetof(Elf64_Ehdr, e_flags), offsetof(Elf64_Ehdr, e_ehsize), 137 offsetof(Elf64_Ehdr, e_phentsize), offsetof(Elf64_Ehdr, e_phnum), 138 offsetof(Elf64_Ehdr, e_shentsize), offsetof(Elf64_Ehdr, e_shnum), 139 offsetof(Elf64_Ehdr, e_shstrndx), 140 141 offsetof(Elf_Note, n_namesz), offsetof(Elf_Note, n_descsz), 142 offsetof(Elf_Note, n_type), 143 144 offsetof(Elf64_Phdr, p_type), offsetof(Elf64_Phdr, p_offset), 145 offsetof(Elf64_Phdr, p_vaddr), offsetof(Elf64_Phdr, p_paddr), 146 offsetof(Elf64_Phdr, p_filesz), offsetof(Elf64_Phdr, p_memsz), 147 offsetof(Elf64_Phdr, p_flags), offsetof(Elf64_Phdr, p_align), 148 149 offsetof(Elf64_Shdr, sh_name), offsetof(Elf64_Shdr, sh_type), 150 offsetof(Elf64_Shdr, sh_flags), offsetof(Elf64_Shdr, sh_addr), 151 offsetof(Elf64_Shdr, sh_offset), offsetof(Elf64_Shdr, sh_size), 152 offsetof(Elf64_Shdr, sh_link), offsetof(Elf64_Shdr, sh_info), 153 offsetof(Elf64_Shdr, sh_addralign), offsetof(Elf64_Shdr, sh_entsize), 154 155 offsetof(Elf64_Sym, st_name), offsetof(Elf64_Sym, st_value), 156 offsetof(Elf64_Sym, st_size), offsetof(Elf64_Sym, st_info), 157 offsetof(Elf64_Sym, st_shndx), 158 159 offsetof(Elf64_Rel, r_offset), offsetof(Elf64_Rel, r_info), 160 161 offsetof(Elf64_Rela, r_offset), offsetof(Elf64_Rela, r_info), 162 offsetof(Elf64_Rela, r_addend) 163}; 164 165/* http://www.sco.com/developers/gabi/latest/ch5.dynamic.html#tag_encodings */ 166const char * 167d_tags(u_int64_t tag) { 168 switch (tag) { 169 case 0: return "DT_NULL"; 170 case 1: return "DT_NEEDED"; 171 case 2: return "DT_PLTRELSZ"; 172 case 3: return "DT_PLTGOT"; 173 case 4: return "DT_HASH"; 174 case 5: return "DT_STRTAB"; 175 case 6: return "DT_SYMTAB"; 176 case 7: return "DT_RELA"; 177 case 8: return "DT_RELASZ"; 178 case 9: return "DT_RELAENT"; 179 case 10: return "DT_STRSZ"; 180 case 11: return "DT_SYMENT"; 181 case 12: return "DT_INIT"; 182 case 13: return "DT_FINI"; 183 case 14: return "DT_SONAME"; 184 case 15: return "DT_RPATH"; 185 case 16: return "DT_SYMBOLIC"; 186 case 17: return "DT_REL"; 187 case 18: return "DT_RELSZ"; 188 case 19: return "DT_RELENT"; 189 case 20: return "DT_PLTREL"; 190 case 21: return "DT_DEBUG"; 191 case 22: return "DT_TEXTREL"; 192 case 23: return "DT_JMPREL"; 193 case 24: return "DT_BIND_NOW"; 194 case 25: return "DT_INIT_ARRAY"; 195 case 26: return "DT_FINI_ARRAY"; 196 case 27: return "DT_INIT_ARRAYSZ"; 197 case 28: return "DT_FINI_ARRAYSZ"; 198 case 29: return "DT_RUNPATH"; 199 case 30: return "DT_FLAGS"; 200 case 32: return "DT_PREINIT_ARRAY"; /* XXX: DT_ENCODING */ 201 case 33: return "DT_PREINIT_ARRAYSZ"; 202 /* 0x6000000D - 0x6ffff000 operating system-specific semantics */ 203 case 0x6ffffdf5: return "DT_GNU_PRELINKED"; 204 case 0x6ffffdf6: return "DT_GNU_CONFLICTSZ"; 205 case 0x6ffffdf7: return "DT_GNU_LIBLISTSZ"; 206 case 0x6ffffdf8: return "DT_SUNW_CHECKSUM"; 207 case 0x6ffffdf9: return "DT_PLTPADSZ"; 208 case 0x6ffffdfa: return "DT_MOVEENT"; 209 case 0x6ffffdfb: return "DT_MOVESZ"; 210 case 0x6ffffdfc: return "DT_FEATURE"; 211 case 0x6ffffdfd: return "DT_POSFLAG_1"; 212 case 0x6ffffdfe: return "DT_SYMINSZ"; 213 case 0x6ffffdff: return "DT_SYMINENT (DT_VALRNGHI)"; 214 case 0x6ffffe00: return "DT_ADDRRNGLO"; 215 case 0x6ffffef8: return "DT_GNU_CONFLICT"; 216 case 0x6ffffef9: return "DT_GNU_LIBLIST"; 217 case 0x6ffffefa: return "DT_SUNW_CONFIG"; 218 case 0x6ffffefb: return "DT_SUNW_DEPAUDIT"; 219 case 0x6ffffefc: return "DT_SUNW_AUDIT"; 220 case 0x6ffffefd: return "DT_SUNW_PLTPAD"; 221 case 0x6ffffefe: return "DT_SUNW_MOVETAB"; 222 case 0x6ffffeff: return "DT_SYMINFO (DT_ADDRRNGHI)"; 223 case 0x6ffffff9: return "DT_RELACOUNT"; 224 case 0x6ffffffa: return "DT_RELCOUNT"; 225 case 0x6ffffffb: return "DT_FLAGS_1"; 226 case 0x6ffffffc: return "DT_VERDEF"; 227 case 0x6ffffffd: return "DT_VERDEFNUM"; 228 case 0x6ffffffe: return "DT_VERNEED"; 229 case 0x6fffffff: return "DT_VERNEEDNUM"; 230 case 0x6ffffff0: return "DT_GNU_VERSYM"; 231 /* 0x70000000 - 0x7fffffff processor-specific semantics */ 232 case 0x70000000: return "DT_IA64_PLT_RESERVE"; 233 case 0x7ffffffd: return "DT_SUNW_AUXILIARY"; 234 case 0x7ffffffe: return "DT_SUNW_USED"; 235 case 0x7fffffff: return "DT_SUNW_FILTER"; 236 default: return "ERROR: TAG NOT DEFINED"; 237 } 238}; 239 240const char * 241e_machines(u_int mach) 242{ 243 switch (mach) { 244 case EM_NONE: return "EM_NONE"; 245 case EM_M32: return "EM_M32"; 246 case EM_SPARC: return "EM_SPARC"; 247 case EM_386: return "EM_386"; 248 case EM_68K: return "EM_68K"; 249 case EM_88K: return "EM_88K"; 250 case EM_486: return "EM_486"; 251 case EM_860: return "EM_860"; 252 case EM_MIPS: return "EM_MIPS"; 253 case EM_IA_64: return "EM_IA_64"; 254 } 255 return "(unknown machine)"; 256}; 257 258char *e_types[] = { 259 "ET_NONE", "ET_REL", "ET_EXEC", "ET_DYN", "ET_CORE" 260}; 261 262char *ei_versions[] = { 263 "EV_NONE", "EV_CURRENT" 264}; 265 266char *ei_classes[] = { 267 "ELFCLASSNONE", "ELFCLASS32", "ELFCLASS64" 268}; 269 270char *ei_data[] = { 271 "ELFDATANONE", "ELFDATA2LSB", "ELFDATA2MSB" 272}; 273 274char *ei_abis[] = { 275 "ELFOSABI_SYSV", "ELFOSABI_HPUX", "ELFOSABI_NETBSD", "ELFOSABI_LINUX", 276 "ELFOSABI_HURD", "ELFOSABI_86OPEN", "ELFOSABI_SOLARIS", 277 "ELFOSABI_MONTEREY", "ELFOSABI_IRIX", "ELFOSABI_FREEBSD", 278 "ELFOSABI_TRU64", "ELFOSABI_MODESTO", "ELFOSABI_OPENBSD" 279}; 280 281char *p_types[] = { 282 "PT_NULL", "PT_LOAD", "PT_DYNAMIC", "PT_INTERP", "PT_NOTE", 283 "PT_SHLIB", "PT_PHDR" 284}; 285 286char *p_flags[] = { 287 "", "PF_X", "PF_W", "PF_X|PF_W", "PF_R", "PF_X|PF_R", "PF_W|PF_R", 288 "PF_X|PF_W|PF_R" 289}; 290 291/* http://www.sco.com/developers/gabi/latest/ch4.sheader.html#sh_type */ 292const char * 293sh_types(u_int64_t sht) { 294 switch (sht) { 295 case 0: return "SHT_NULL"; 296 case 1: return "SHT_PROGBITS"; 297 case 2: return "SHT_SYMTAB"; 298 case 3: return "SHT_STRTAB"; 299 case 4: return "SHT_RELA"; 300 case 5: return "SHT_HASH"; 301 case 6: return "SHT_DYNAMIC"; 302 case 7: return "SHT_NOTE"; 303 case 8: return "SHT_NOBITS"; 304 case 9: return "SHT_REL"; 305 case 10: return "SHT_SHLIB"; 306 case 11: return "SHT_DYNSYM"; 307 case 14: return "SHT_INIT_ARRAY"; 308 case 15: return "SHT_FINI_ARRAY"; 309 case 16: return "SHT_PREINIT_ARRAY"; 310 case 17: return "SHT_GROUP"; 311 case 18: return "SHT_SYMTAB_SHNDX"; 312 /* 0x60000000 - 0x6fffffff operating system-specific semantics */ 313 case 0x6ffffff0: return "XXX:VERSYM"; 314 case 0x6ffffff7: return "SHT_GNU_LIBLIST"; 315 case 0x6ffffffc: return "XXX:VERDEF"; 316 case 0x6ffffffd: return "SHT_SUNW(GNU)_verdef"; 317 case 0x6ffffffe: return "SHT_SUNW(GNU)_verneed"; 318 case 0x6fffffff: return "SHT_SUNW(GNU)_versym"; 319 /* 0x70000000 - 0x7fffffff processor-specific semantics */ 320 case 0x70000000: return "SHT_IA_64_EXT"; 321 case 0x70000001: return "SHT_IA_64_UNWIND"; 322 case 0x7ffffffd: return "XXX:AUXILIARY"; 323 case 0x7fffffff: return "XXX:FILTER"; 324 /* 0x80000000 - 0xffffffff application programs */ 325 default: return "ERROR: SHT NOT DEFINED"; 326 } 327}; 328 329char *sh_flags[] = { 330 "", "SHF_WRITE", "SHF_ALLOC", "SHF_WRITE|SHF_ALLOC", "SHF_EXECINSTR", 331 "SHF_WRITE|SHF_EXECINSTR", "SHF_ALLOC|SHF_EXECINSTR", 332 "SHF_WRITE|SHF_ALLOC|SHF_EXECINSTR" 333}; 334 335char *st_types[] = { 336 "STT_NOTYPE", "STT_OBJECT", "STT_FUNC", "STT_SECTION", "STT_FILE" 337}; 338 339char *st_bindings[] = { 340 "STB_LOCAL", "STB_GLOBAL", "STB_WEAK" 341}; 342 343char *dynstr; 344char *shstrtab; 345char *strtab; 346FILE *out; 347 348u_int64_t elf_get_byte(Elf32_Ehdr *e, void *base, elf_member_t member); 349u_int64_t elf_get_quarter(Elf32_Ehdr *e, void *base, elf_member_t member); 350u_int64_t elf_get_half(Elf32_Ehdr *e, void *base, elf_member_t member); 351u_int64_t elf_get_word(Elf32_Ehdr *e, void *base, elf_member_t member); 352u_int64_t elf_get_quad(Elf32_Ehdr *e, void *base, elf_member_t member); 353 354void elf_print_ehdr(void *e); 355void elf_print_phdr(void *e, void *p); 356void elf_print_shdr(void *e, void *sh); 357void elf_print_symtab(void *e, void *sh, char *str); 358void elf_print_dynamic(void *e, void *sh); 359void elf_print_rel(void *e, void *r); 360void elf_print_rela(void *e, void *ra); 361void elf_print_interp(void *e, void *p); 362void elf_print_got(void *e, void *sh); 363void elf_print_hash(void *e, void *sh); 364void elf_print_note(void *e, void *sh); 365 366void usage(void); 367 368int 369main(int ac, char **av) 370{ 371 u_int64_t phoff; 372 u_int64_t shoff; 373 u_int64_t phentsize; 374 u_int64_t phnum; 375 u_int64_t shentsize; 376 u_int64_t shnum; 377 u_int64_t shstrndx; 378 u_int64_t offset; 379 u_int64_t name; 380 u_int64_t type; 381 struct stat sb; 382 u_int flags; 383 void *e; 384 void *p; 385 void *sh; 386 void *v; 387 int fd; 388 int ch; 389 int i; 390 391 out = stdout; 392 flags = 0; 393 while ((ch = getopt(ac, av, "acdeiGhnprsw:")) != -1) 394 switch (ch) { 395 case 'a': 396 flags = ED_ALL; 397 break; 398 case 'c': 399 flags |= ED_SHDR; 400 break; 401 case 'd': 402 flags |= ED_DYN; 403 break; 404 case 'e': 405 flags |= ED_EHDR; 406 break; 407 case 'i': 408 flags |= ED_INTERP; 409 break; 410 case 'G': 411 flags |= ED_GOT; 412 break; 413 case 'h': 414 flags |= ED_HASH; 415 break; 416 case 'n': 417 flags |= ED_NOTE; 418 break; 419 case 'p': 420 flags |= ED_PHDR; 421 break; 422 case 'r': 423 flags |= ED_REL; 424 break; 425 case 's': 426 flags |= ED_SYMTAB; 427 break; 428 case 'w': 429 if ((out = fopen(optarg, "w")) == NULL) 430 err(1, "%s", optarg); 431 break; 432 case '?': 433 default: 434 usage(); 435 } 436 ac -= optind; 437 av += optind; 438 if (ac == 0 || flags == 0) 439 usage(); 440 if ((fd = open(*av, O_RDONLY)) < 0 || 441 fstat(fd, &sb) < 0) 442 err(1, NULL); 443 e = mmap(NULL, sb.st_size, PROT_READ, MAP_SHARED, fd, 0); 444 if (e == MAP_FAILED) 445 err(1, NULL); 446 if (!IS_ELF(*(Elf32_Ehdr *)e)) 447 errx(1, "not an elf file"); 448 phoff = elf_get_off(e, e, E_PHOFF); 449 shoff = elf_get_off(e, e, E_SHOFF); 450 phentsize = elf_get_quarter(e, e, E_PHENTSIZE); 451 phnum = elf_get_quarter(e, e, E_PHNUM); 452 shentsize = elf_get_quarter(e, e, E_SHENTSIZE); 453 shnum = elf_get_quarter(e, e, E_SHNUM); 454 shstrndx = elf_get_quarter(e, e, E_SHSTRNDX); 455 p = e + phoff; 456 sh = e + shoff; 457 offset = elf_get_off(e, sh + shstrndx * shentsize, SH_OFFSET); 458 shstrtab = e + offset; 459 for (i = 0; i < shnum; i++) { 460 name = elf_get_word(e, sh + i * shentsize, SH_NAME); 461 offset = elf_get_off(e, sh + i * shentsize, SH_OFFSET); 462 if (strcmp(shstrtab + name, ".strtab") == 0) 463 strtab = e + offset; 464 if (strcmp(shstrtab + name, ".dynstr") == 0) 465 dynstr = e + offset; 466 } 467 if (flags & ED_EHDR) 468 elf_print_ehdr(e); 469 if (flags & ED_PHDR) 470 elf_print_phdr(e, p); 471 if (flags & ED_SHDR) 472 elf_print_shdr(e, sh); 473 for (i = 0; i < phnum; i++) { 474 v = p + i * phentsize; 475 type = elf_get_word(e, v, P_TYPE); 476 switch (type) { 477 case PT_INTERP: 478 if (flags & ED_INTERP) 479 elf_print_interp(e, v); 480 break; 481 case PT_NULL: 482 case PT_LOAD: 483 case PT_DYNAMIC: 484 case PT_NOTE: 485 case PT_SHLIB: 486 case PT_PHDR: 487 break; 488 } 489 } 490 for (i = 0; i < shnum; i++) { 491 v = sh + i * shentsize; 492 type = elf_get_word(e, v, SH_TYPE); 493 switch (type) { 494 case SHT_SYMTAB: 495 if (flags & ED_SYMTAB) 496 elf_print_symtab(e, v, strtab); 497 break; 498 case SHT_DYNAMIC: 499 if (flags & ED_DYN) 500 elf_print_dynamic(e, v); 501 break; 502 case SHT_RELA: 503 if (flags & ED_REL) 504 elf_print_rela(e, v); 505 break; 506 case SHT_REL: 507 if (flags & ED_REL) 508 elf_print_rel(e, v); 509 break; 510 case SHT_NOTE: 511 name = elf_get_word(e, v, SH_NAME); 512 if (flags & ED_NOTE && 513 strcmp(shstrtab + name, ".note.ABI-tag") == 0) 514 elf_print_note(e, v); 515 break; 516 case SHT_DYNSYM: 517 if (flags & ED_SYMTAB) 518 elf_print_symtab(e, v, dynstr); 519 break; 520 case SHT_PROGBITS: 521 name = elf_get_word(e, v, SH_NAME); 522 if (flags & ED_GOT && 523 strcmp(shstrtab + name, ".got") == 0) 524 elf_print_got(e, v); 525 break; 526 case SHT_HASH: 527 if (flags & ED_HASH) 528 elf_print_hash(e, v); 529 break; 530 case SHT_NULL: 531 case SHT_STRTAB: 532 case SHT_NOBITS: 533 case SHT_SHLIB: 534 break; 535 } 536 } 537 538 return 0; 539} 540 541void 542elf_print_ehdr(void *e) 543{ 544 u_int64_t class; 545 u_int64_t data; 546 u_int64_t osabi; 547 u_int64_t type; 548 u_int64_t machine; 549 u_int64_t version; 550 u_int64_t entry; 551 u_int64_t phoff; 552 u_int64_t shoff; 553 u_int64_t flags; 554 u_int64_t ehsize; 555 u_int64_t phentsize; 556 u_int64_t phnum; 557 u_int64_t shentsize; 558 u_int64_t shnum; 559 u_int64_t shstrndx; 560 561 class = elf_get_byte(e, e, E_CLASS); 562 data = elf_get_byte(e, e, E_DATA); 563 osabi = elf_get_byte(e, e, E_OSABI); 564 type = elf_get_quarter(e, e, E_TYPE); 565 machine = elf_get_quarter(e, e, E_MACHINE); 566 version = elf_get_word(e, e, E_VERSION); 567 entry = elf_get_addr(e, e, E_ENTRY); 568 phoff = elf_get_off(e, e, E_PHOFF); 569 shoff = elf_get_off(e, e, E_SHOFF); 570 flags = elf_get_word(e, e, E_FLAGS); 571 ehsize = elf_get_quarter(e, e, E_EHSIZE); 572 phentsize = elf_get_quarter(e, e, E_PHENTSIZE); 573 phnum = elf_get_quarter(e, e, E_PHNUM); 574 shentsize = elf_get_quarter(e, e, E_SHENTSIZE); 575 shnum = elf_get_quarter(e, e, E_SHNUM); 576 shstrndx = elf_get_quarter(e, e, E_SHSTRNDX); 577 fprintf(out, "\nelf header:\n"); 578 fprintf(out, "\n"); 579 fprintf(out, "\te_ident: %s %s %s\n", ei_classes[class], ei_data[data], 580 ei_abis[osabi]); 581 fprintf(out, "\te_type: %s\n", e_types[type]); 582 fprintf(out, "\te_machine: %s\n", e_machines(machine)); 583 fprintf(out, "\te_version: %s\n", ei_versions[version]); 584 fprintf(out, "\te_entry: %#llx\n", entry); 585 fprintf(out, "\te_phoff: %lld\n", phoff); 586 fprintf(out, "\te_shoff: %lld\n", shoff); 587 fprintf(out, "\te_flags: %lld\n", flags); 588 fprintf(out, "\te_ehsize: %lld\n", ehsize); 589 fprintf(out, "\te_phentsize: %lld\n", phentsize); 590 fprintf(out, "\te_phnum: %lld\n", phnum); 591 fprintf(out, "\te_shentsize: %lld\n", shentsize); 592 fprintf(out, "\te_shnum: %lld\n", shnum); 593 fprintf(out, "\te_shstrndx: %lld\n", shstrndx); 594} 595 596void 597elf_print_phdr(void *e, void *p) 598{ 599 u_int64_t phentsize; 600 u_int64_t phnum; 601 u_int64_t type; 602 u_int64_t offset; 603 u_int64_t vaddr; 604 u_int64_t paddr; 605 u_int64_t filesz; 606 u_int64_t memsz; 607 u_int64_t flags; 608 u_int64_t align; 609 void *v; 610 int i; 611 612 phentsize = elf_get_quarter(e, e, E_PHENTSIZE); 613 phnum = elf_get_quarter(e, e, E_PHNUM); 614 fprintf(out, "\nprogram header:\n"); 615 for (i = 0; i < phnum; i++) { 616 v = p + i * phentsize; 617 type = elf_get_word(e, v, P_TYPE); 618 offset = elf_get_off(e, v, P_OFFSET); 619 vaddr = elf_get_addr(e, v, P_VADDR); 620 paddr = elf_get_addr(e, v, P_PADDR); 621 filesz = elf_get_size(e, v, P_FILESZ); 622 memsz = elf_get_size(e, v, P_MEMSZ); 623 flags = elf_get_word(e, v, P_FLAGS); 624 align = elf_get_size(e, v, P_ALIGN); 625 fprintf(out, "\n"); 626 fprintf(out, "entry: %d\n", i); 627 fprintf(out, "\tp_type: %s\n", p_types[type & 0x7]); 628 fprintf(out, "\tp_offset: %lld\n", offset); 629 fprintf(out, "\tp_vaddr: %#llx\n", vaddr); 630 fprintf(out, "\tp_paddr: %#llx\n", paddr); 631 fprintf(out, "\tp_filesz: %lld\n", filesz); 632 fprintf(out, "\tp_memsz: %lld\n", memsz); 633 fprintf(out, "\tp_flags: %s\n", p_flags[flags]); 634 fprintf(out, "\tp_align: %lld\n", align); 635 } 636} 637 638void 639elf_print_shdr(void *e, void *sh) 640{ 641 u_int64_t shentsize; 642 u_int64_t shnum; 643 u_int64_t name; 644 u_int64_t type; 645 u_int64_t flags; 646 u_int64_t addr; 647 u_int64_t offset; 648 u_int64_t size; 649 u_int64_t link; 650 u_int64_t info; 651 u_int64_t addralign; 652 u_int64_t entsize; 653 void *v; 654 int i; 655 656 shentsize = elf_get_quarter(e, e, E_SHENTSIZE); 657 shnum = elf_get_quarter(e, e, E_SHNUM); 658 fprintf(out, "\nsection header:\n"); 659 for (i = 0; i < shnum; i++) { 660 v = sh + i * shentsize; 661 name = elf_get_word(e, v, SH_NAME); 662 type = elf_get_word(e, v, SH_TYPE); 663 flags = elf_get_word(e, v, SH_FLAGS); 664 addr = elf_get_addr(e, v, SH_ADDR); 665 offset = elf_get_off(e, v, SH_OFFSET); 666 size = elf_get_size(e, v, SH_SIZE); 667 link = elf_get_word(e, v, SH_LINK); 668 info = elf_get_word(e, v, SH_INFO); 669 addralign = elf_get_size(e, v, SH_ADDRALIGN); 670 entsize = elf_get_size(e, v, SH_ENTSIZE); 671 fprintf(out, "\n"); 672 fprintf(out, "entry: %d\n", i); 673 fprintf(out, "\tsh_name: %s\n", shstrtab + name); 674 fprintf(out, "\tsh_type: %s\n", sh_types(type)); 675 fprintf(out, "\tsh_flags: %s\n", sh_flags[flags & 0x7]); 676 fprintf(out, "\tsh_addr: %#llx\n", addr); 677 fprintf(out, "\tsh_offset: %lld\n", offset); 678 fprintf(out, "\tsh_size: %lld\n", size); 679 fprintf(out, "\tsh_link: %lld\n", link); 680 fprintf(out, "\tsh_info: %lld\n", info); 681 fprintf(out, "\tsh_addralign: %lld\n", addralign); 682 fprintf(out, "\tsh_entsize: %lld\n", entsize); 683 } 684} 685 686void 687elf_print_symtab(void *e, void *sh, char *str) 688{ 689 u_int64_t offset; 690 u_int64_t entsize; 691 u_int64_t size; 692 u_int64_t name; 693 u_int64_t value; 694 u_int64_t info; 695 u_int64_t shndx; 696 void *st; 697 int len; 698 int i; 699 700 offset = elf_get_off(e, sh, SH_OFFSET); 701 entsize = elf_get_size(e, sh, SH_ENTSIZE); 702 size = elf_get_size(e, sh, SH_SIZE); 703 name = elf_get_word(e, sh, SH_NAME); 704 len = size / entsize; 705 fprintf(out, "\nsymbol table (%s):\n", shstrtab + name); 706 for (i = 0; i < len; i++) { 707 st = e + offset + i * entsize; 708 name = elf_get_word(e, st, ST_NAME); 709 value = elf_get_addr(e, st, ST_VALUE); 710 size = elf_get_size(e, st, ST_SIZE); 711 info = elf_get_byte(e, st, ST_INFO); 712 shndx = elf_get_quarter(e, st, ST_SHNDX); 713 fprintf(out, "\n"); 714 fprintf(out, "entry: %d\n", i); 715 fprintf(out, "\tst_name: %s\n", str + name); 716 fprintf(out, "\tst_value: %#llx\n", value); 717 fprintf(out, "\tst_size: %lld\n", size); 718 fprintf(out, "\tst_info: %s %s\n", 719 st_types[ELF32_ST_TYPE(info)], 720 st_bindings[ELF32_ST_BIND(info)]); 721 fprintf(out, "\tst_shndx: %lld\n", shndx); 722 } 723} 724 725void 726elf_print_dynamic(void *e, void *sh) 727{ 728 u_int64_t offset; 729 u_int64_t entsize; 730 u_int64_t size; 731 int64_t tag; 732 u_int64_t ptr; 733 u_int64_t val; 734 void *d; 735 int i; 736 737 offset = elf_get_off(e, sh, SH_OFFSET); 738 entsize = elf_get_size(e, sh, SH_ENTSIZE); 739 size = elf_get_size(e, sh, SH_SIZE); 740 fprintf(out, "\ndynamic:\n"); 741 for (i = 0; i < size / entsize; i++) { 742 d = e + offset + i * entsize; 743 tag = elf_get_size(e, d, D_TAG); 744 ptr = elf_get_size(e, d, D_PTR); 745 val = elf_get_addr(e, d, D_VAL); 746 fprintf(out, "\n"); 747 fprintf(out, "entry: %d\n", i); 748 fprintf(out, "\td_tag: %s\n", d_tags(tag)); 749 switch (tag) { 750 case DT_NEEDED: 751 case DT_SONAME: 752 case DT_RPATH: 753 fprintf(out, "\td_val: %s\n", dynstr + val); 754 break; 755 case DT_PLTRELSZ: 756 case DT_RELA: 757 case DT_RELASZ: 758 case DT_RELAENT: 759 case DT_STRSZ: 760 case DT_SYMENT: 761 case DT_RELSZ: 762 case DT_RELENT: 763 case DT_PLTREL: 764 fprintf(out, "\td_val: %lld\n", val); 765 break; 766 case DT_PLTGOT: 767 case DT_HASH: 768 case DT_STRTAB: 769 case DT_SYMTAB: 770 case DT_INIT: 771 case DT_FINI: 772 case DT_REL: 773 case DT_JMPREL: 774 fprintf(out, "\td_ptr: %#llx\n", ptr); 775 break; 776 case DT_NULL: 777 case DT_SYMBOLIC: 778 case DT_DEBUG: 779 case DT_TEXTREL: 780 break; 781 } 782 } 783} 784 785void 786elf_print_rela(void *e, void *sh) 787{ 788 u_int64_t offset; 789 u_int64_t entsize; 790 u_int64_t size; 791 u_int64_t name; 792 u_int64_t info; 793 int64_t addend; 794 void *ra; 795 void *v; 796 int i; 797 798 offset = elf_get_off(e, sh, SH_OFFSET); 799 entsize = elf_get_size(e, sh, SH_ENTSIZE); 800 size = elf_get_size(e, sh, SH_SIZE); 801 name = elf_get_word(e, sh, SH_NAME); 802 v = e + offset; 803 fprintf(out, "\nrelocation with addend (%s):\n", shstrtab + name); 804 for (i = 0; i < size / entsize; i++) { 805 ra = v + i * entsize; 806 offset = elf_get_addr(e, ra, RA_OFFSET); 807 info = elf_get_word(e, ra, RA_INFO); 808 addend = elf_get_off(e, ra, RA_ADDEND); 809 fprintf(out, "\n"); 810 fprintf(out, "entry: %d\n", i); 811 fprintf(out, "\tr_offset: %#llx\n", offset); 812 fprintf(out, "\tr_info: %lld\n", info); 813 fprintf(out, "\tr_addend: %lld\n", addend); 814 } 815} 816 817void 818elf_print_rel(void *e, void *sh) 819{ 820 u_int64_t offset; 821 u_int64_t entsize; 822 u_int64_t size; 823 u_int64_t name; 824 u_int64_t info; 825 void *r; 826 void *v; 827 int i; 828 829 offset = elf_get_off(e, sh, SH_OFFSET); 830 entsize = elf_get_size(e, sh, SH_ENTSIZE); 831 size = elf_get_size(e, sh, SH_SIZE); 832 name = elf_get_word(e, sh, SH_NAME); 833 v = e + offset; 834 fprintf(out, "\nrelocation (%s):\n", shstrtab + name); 835 for (i = 0; i < size / entsize; i++) { 836 r = v + i * entsize; 837 offset = elf_get_addr(e, r, R_OFFSET); 838 info = elf_get_word(e, r, R_INFO); 839 fprintf(out, "\n"); 840 fprintf(out, "entry: %d\n", i); 841 fprintf(out, "\tr_offset: %#llx\n", offset); 842 fprintf(out, "\tr_info: %lld\n", info); 843 } 844} 845 846void 847elf_print_interp(void *e, void *p) 848{ 849 u_int64_t offset; 850 char *s; 851 852 offset = elf_get_off(e, p, P_OFFSET); 853 s = e + offset; 854 fprintf(out, "\ninterp:\n"); 855 fprintf(out, "\t%s\n", s); 856} 857 858void 859elf_print_got(void *e, void *sh) 860{ 861 u_int64_t offset; 862 u_int64_t addralign; 863 u_int64_t size; 864 u_int64_t addr; 865 void *v; 866 int i; 867 868 offset = elf_get_off(e, sh, SH_OFFSET); 869 addralign = elf_get_size(e, sh, SH_ADDRALIGN); 870 size = elf_get_size(e, sh, SH_SIZE); 871 v = e + offset; 872 fprintf(out, "\nglobal offset table:\n"); 873 for (i = 0; i < size / addralign; i++) { 874 addr = elf_get_addr(e, v + i * addralign, 0); 875 fprintf(out, "\n"); 876 fprintf(out, "entry: %d\n", i); 877 fprintf(out, "\t%#llx\n", addr); 878 } 879} 880 881void 882elf_print_hash(void *e, void *sh) 883{ 884} 885 886void 887elf_print_note(void *e, void *sh) 888{ 889 u_int64_t offset; 890 u_int64_t size; 891 u_int64_t name; 892 u_int32_t namesz; 893 u_int32_t descsz; 894 u_int32_t type; 895 u_int32_t desc; 896 char *s; 897 void *n; 898 899 offset = elf_get_off(e, sh, SH_OFFSET); 900 size = elf_get_size(e, sh, SH_SIZE); 901 name = elf_get_word(e, sh, SH_NAME); 902 n = e + offset; 903 fprintf(out, "\nnote (%s):\n", shstrtab + name); 904 while (n < e + offset + size) { 905 namesz = elf_get_word(e, n, N_NAMESZ); 906 descsz = elf_get_word(e, n, N_DESCSZ); 907 type = elf_get_word(e, n, N_TYPE); 908 s = n + sizeof(Elf_Note); 909 desc = elf_get_word(e, n + sizeof(Elf_Note) + namesz, 0); 910 fprintf(out, "\t%s %d\n", s, desc); 911 n += sizeof(Elf_Note) + namesz + descsz; 912 } 913} 914 915u_int64_t 916elf_get_byte(Elf32_Ehdr *e, void *base, elf_member_t member) 917{ 918 u_int64_t val; 919 u_char *p; 920 921 val = 0; 922 switch (e->e_ident[EI_CLASS]) { 923 case ELFCLASS32: 924 p = base + elf32_offsets[member]; 925 val = *p; 926 break; 927 case ELFCLASS64: 928 p = base + elf64_offsets[member]; 929 val = *p; 930 break; 931 case ELFCLASSNONE: 932 errx(1, "invalid class"); 933 } 934 935 return val; 936} 937 938u_int64_t 939elf_get_quarter(Elf32_Ehdr *e, void *base, elf_member_t member) 940{ 941 u_int64_t val; 942 u_char *p; 943 944 val = 0; 945 switch (e->e_ident[EI_CLASS]) { 946 case ELFCLASS32: 947 p = base + elf32_offsets[member]; 948 switch (e->e_ident[EI_DATA]) { 949 case ELFDATA2MSB: 950 val = p[0] << 8 | p[1]; 951 break; 952 case ELFDATA2LSB: 953 val = p[1] << 8 | p[0]; 954 break; 955 case ELFDATANONE: 956 errx(1, "invalid data format"); 957 } 958 break; 959 case ELFCLASS64: 960 p = base + elf64_offsets[member]; 961 switch (e->e_ident[EI_DATA]) { 962 case ELFDATA2MSB: 963 val = p[0] << 8 | p[1]; 964 break; 965 case ELFDATA2LSB: 966 val = p[1] << 8 | p[0]; 967 break; 968 case ELFDATANONE: 969 errx(1, "invalid data format"); 970 } 971 break; 972 case ELFCLASSNONE: 973 errx(1, "invalid class"); 974 } 975 976 return val; 977} 978 979u_int64_t 980elf_get_half(Elf32_Ehdr *e, void *base, elf_member_t member) 981{ 982 u_int64_t val; 983 u_char *p; 984 985 val = 0; 986 switch (e->e_ident[EI_CLASS]) { 987 case ELFCLASS32: 988 p = base + elf32_offsets[member]; 989 switch (e->e_ident[EI_DATA]) { 990 case ELFDATA2MSB: 991 val = p[0] << 8 | p[1]; 992 break; 993 case ELFDATA2LSB: 994 val = p[1] << 8 | p[0]; 995 break; 996 case ELFDATANONE: 997 errx(1, "invalid data format"); 998 } 999 break; 1000 case ELFCLASS64: 1001 p = base + elf64_offsets[member]; 1002 switch (e->e_ident[EI_DATA]) { 1003 case ELFDATA2MSB: 1004 val = p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3]; 1005 break; 1006 case ELFDATA2LSB: 1007 val = p[3] << 24 | p[2] << 16 | p[1] << 8 | p[0]; 1008 break; 1009 case ELFDATANONE: 1010 errx(1, "invalid data format"); 1011 } 1012 break; 1013 case ELFCLASSNONE: 1014 errx(1, "invalid class"); 1015 } 1016 1017 return val; 1018} 1019 1020u_int64_t 1021elf_get_word(Elf32_Ehdr *e, void *base, elf_member_t member) 1022{ 1023 u_int64_t val; 1024 u_char *p; 1025 1026 val = 0; 1027 switch (e->e_ident[EI_CLASS]) { 1028 case ELFCLASS32: 1029 p = base + elf32_offsets[member]; 1030 switch (e->e_ident[EI_DATA]) { 1031 case ELFDATA2MSB: 1032 val = p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3]; 1033 break; 1034 case ELFDATA2LSB: 1035 val = p[3] << 24 | p[2] << 16 | p[1] << 8 | p[0]; 1036 break; 1037 case ELFDATANONE: 1038 errx(1, "invalid data format"); 1039 } 1040 break; 1041 case ELFCLASS64: 1042 p = base + elf64_offsets[member]; 1043 switch (e->e_ident[EI_DATA]) { 1044 case ELFDATA2MSB: 1045 val = p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3]; 1046 break; 1047 case ELFDATA2LSB: 1048 val = p[3] << 24 | p[2] << 16 | p[1] << 8 | p[0]; 1049 break; 1050 case ELFDATANONE: 1051 errx(1, "invalid data format"); 1052 } 1053 break; 1054 case ELFCLASSNONE: 1055 errx(1, "invalid class"); 1056 } 1057 1058 return val; 1059} 1060 1061u_int64_t 1062elf_get_quad(Elf32_Ehdr *e, void *base, elf_member_t member) 1063{ 1064 u_int64_t high; 1065 u_int64_t low; 1066 u_int64_t val; 1067 u_char *p; 1068 1069 val = 0; 1070 switch (e->e_ident[EI_CLASS]) { 1071 case ELFCLASS32: 1072 p = base + elf32_offsets[member]; 1073 switch (e->e_ident[EI_DATA]) { 1074 case ELFDATA2MSB: 1075 val = p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3]; 1076 break; 1077 case ELFDATA2LSB: 1078 val = p[3] << 24 | p[2] << 16 | p[1] << 8 | p[0]; 1079 break; 1080 case ELFDATANONE: 1081 errx(1, "invalid data format"); 1082 } 1083 break; 1084 case ELFCLASS64: 1085 p = base + elf64_offsets[member]; 1086 switch (e->e_ident[EI_DATA]) { 1087 case ELFDATA2MSB: 1088 high = p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3]; 1089 low = p[4] << 24 | p[5] << 16 | p[6] << 8 | p[7]; 1090 val = high << 32 | low; 1091 break; 1092 case ELFDATA2LSB: 1093 high = p[7] << 24 | p[6] << 16 | p[5] << 8 | p[4]; 1094 low = p[3] << 24 | p[2] << 16 | p[1] << 8 | p[0]; 1095 val = high << 32 | low; 1096 break; 1097 case ELFDATANONE: 1098 errx(1, "invalid data format"); 1099 } 1100 break; 1101 case ELFCLASSNONE: 1102 errx(1, "invalid class"); 1103 } 1104 1105 return val; 1106} 1107 1108void 1109usage(void) 1110{ 1111 fprintf(stderr, "usage: elfdump [-acdeiGhnprs] [-w file] filename\n"); 1112 exit(1); 1113} 1114