elfdump.c revision 153500
1254219Scy/*- 2254219Scy * Copyright (c) 2003 David O'Brien. All rights reserved. 3254219Scy * Copyright (c) 2001 Jake Burkholder 4254219Scy * All rights reserved. 5254219Scy * 6254219Scy * Redistribution and use in source and binary forms, with or without 7254219Scy * modification, are permitted provided that the following conditions 8254219Scy * are met: 9254219Scy * 1. Redistributions of source code must retain the above copyright 10254219Scy * notice, this list of conditions and the following disclaimer. 11254219Scy * 2. Redistributions in binary form must reproduce the above copyright 12254219Scy * notice, this list of conditions and the following disclaimer in the 13254219Scy * documentation and/or other materials provided with the distribution. 14254219Scy * 15254219Scy * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16254219Scy * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17254219Scy * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18254219Scy * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19254219Scy * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20254219Scy * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21254219Scy * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22254219Scy * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23254219Scy * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24254219Scy * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25254219Scy * SUCH DAMAGE. 26254219Scy */ 27254219Scy 28254219Scy#include <sys/cdefs.h> 29254219Scy__FBSDID("$FreeBSD: head/usr.bin/elfdump/elfdump.c 153500 2005-12-17 23:24:34Z marcel $"); 30254219Scy 31254219Scy#include <sys/types.h> 32254219Scy#include <sys/elf32.h> 33254219Scy#include <sys/elf64.h> 34254219Scy#include <sys/endian.h> 35254219Scy#include <sys/mman.h> 36254219Scy#include <sys/stat.h> 37254219Scy#include <err.h> 38254219Scy#include <fcntl.h> 39254219Scy#include <inttypes.h> 40254219Scy#include <stddef.h> 41254219Scy#include <stdio.h> 42254219Scy#include <stdlib.h> 43254219Scy#include <string.h> 44254219Scy#include <unistd.h> 45254219Scy 46254219Scy#define ED_DYN (1<<0) 47254219Scy#define ED_EHDR (1<<1) 48254219Scy#define ED_GOT (1<<2) 49#define ED_HASH (1<<3) 50#define ED_INTERP (1<<4) 51#define ED_NOTE (1<<5) 52#define ED_PHDR (1<<6) 53#define ED_REL (1<<7) 54#define ED_SHDR (1<<8) 55#define ED_SYMTAB (1<<9) 56#define ED_ALL ((1<<10)-1) 57 58#define elf_get_addr elf_get_quad 59#define elf_get_off elf_get_quad 60#define elf_get_size elf_get_quad 61 62enum elf_member { 63 D_TAG = 1, D_PTR, D_VAL, 64 65 E_CLASS, E_DATA, E_OSABI, E_TYPE, E_MACHINE, E_VERSION, E_ENTRY, 66 E_PHOFF, E_SHOFF, E_FLAGS, E_EHSIZE, E_PHENTSIZE, E_PHNUM, E_SHENTSIZE, 67 E_SHNUM, E_SHSTRNDX, 68 69 N_NAMESZ, N_DESCSZ, N_TYPE, 70 71 P_TYPE, P_OFFSET, P_VADDR, P_PADDR, P_FILESZ, P_MEMSZ, P_FLAGS, 72 P_ALIGN, 73 74 SH_NAME, SH_TYPE, SH_FLAGS, SH_ADDR, SH_OFFSET, SH_SIZE, SH_LINK, 75 SH_INFO, SH_ADDRALIGN, SH_ENTSIZE, 76 77 ST_NAME, ST_VALUE, ST_SIZE, ST_INFO, ST_SHNDX, 78 79 R_OFFSET, R_INFO, 80 81 RA_OFFSET, RA_INFO, RA_ADDEND 82}; 83 84typedef enum elf_member elf_member_t; 85 86int elf32_offsets[] = { 87 0, 88 89 offsetof(Elf32_Dyn, d_tag), offsetof(Elf32_Dyn, d_un.d_ptr), 90 offsetof(Elf32_Dyn, d_un.d_val), 91 92 offsetof(Elf32_Ehdr, e_ident[EI_CLASS]), 93 offsetof(Elf32_Ehdr, e_ident[EI_DATA]), 94 offsetof(Elf32_Ehdr, e_ident[EI_OSABI]), 95 offsetof(Elf32_Ehdr, e_type), offsetof(Elf32_Ehdr, e_machine), 96 offsetof(Elf32_Ehdr, e_version), offsetof(Elf32_Ehdr, e_entry), 97 offsetof(Elf32_Ehdr, e_phoff), offsetof(Elf32_Ehdr, e_shoff), 98 offsetof(Elf32_Ehdr, e_flags), offsetof(Elf32_Ehdr, e_ehsize), 99 offsetof(Elf32_Ehdr, e_phentsize), offsetof(Elf32_Ehdr, e_phnum), 100 offsetof(Elf32_Ehdr, e_shentsize), offsetof(Elf32_Ehdr, e_shnum), 101 offsetof(Elf32_Ehdr, e_shstrndx), 102 103 offsetof(Elf_Note, n_namesz), offsetof(Elf_Note, n_descsz), 104 offsetof(Elf_Note, n_type), 105 106 offsetof(Elf32_Phdr, p_type), offsetof(Elf32_Phdr, p_offset), 107 offsetof(Elf32_Phdr, p_vaddr), offsetof(Elf32_Phdr, p_paddr), 108 offsetof(Elf32_Phdr, p_filesz), offsetof(Elf32_Phdr, p_memsz), 109 offsetof(Elf32_Phdr, p_flags), offsetof(Elf32_Phdr, p_align), 110 111 offsetof(Elf32_Shdr, sh_name), offsetof(Elf32_Shdr, sh_type), 112 offsetof(Elf32_Shdr, sh_flags), offsetof(Elf32_Shdr, sh_addr), 113 offsetof(Elf32_Shdr, sh_offset), offsetof(Elf32_Shdr, sh_size), 114 offsetof(Elf32_Shdr, sh_link), offsetof(Elf32_Shdr, sh_info), 115 offsetof(Elf32_Shdr, sh_addralign), offsetof(Elf32_Shdr, sh_entsize), 116 117 offsetof(Elf32_Sym, st_name), offsetof(Elf32_Sym, st_value), 118 offsetof(Elf32_Sym, st_size), offsetof(Elf32_Sym, st_info), 119 offsetof(Elf32_Sym, st_shndx), 120 121 offsetof(Elf32_Rel, r_offset), offsetof(Elf32_Rel, r_info), 122 123 offsetof(Elf32_Rela, r_offset), offsetof(Elf32_Rela, r_info), 124 offsetof(Elf32_Rela, r_addend) 125}; 126 127int elf64_offsets[] = { 128 0, 129 130 offsetof(Elf64_Dyn, d_tag), offsetof(Elf64_Dyn, d_un.d_ptr), 131 offsetof(Elf64_Dyn, d_un.d_val), 132 133 offsetof(Elf32_Ehdr, e_ident[EI_CLASS]), 134 offsetof(Elf32_Ehdr, e_ident[EI_DATA]), 135 offsetof(Elf32_Ehdr, e_ident[EI_OSABI]), 136 offsetof(Elf64_Ehdr, e_type), offsetof(Elf64_Ehdr, e_machine), 137 offsetof(Elf64_Ehdr, e_version), offsetof(Elf64_Ehdr, e_entry), 138 offsetof(Elf64_Ehdr, e_phoff), offsetof(Elf64_Ehdr, e_shoff), 139 offsetof(Elf64_Ehdr, e_flags), offsetof(Elf64_Ehdr, e_ehsize), 140 offsetof(Elf64_Ehdr, e_phentsize), offsetof(Elf64_Ehdr, e_phnum), 141 offsetof(Elf64_Ehdr, e_shentsize), offsetof(Elf64_Ehdr, e_shnum), 142 offsetof(Elf64_Ehdr, e_shstrndx), 143 144 offsetof(Elf_Note, n_namesz), offsetof(Elf_Note, n_descsz), 145 offsetof(Elf_Note, n_type), 146 147 offsetof(Elf64_Phdr, p_type), offsetof(Elf64_Phdr, p_offset), 148 offsetof(Elf64_Phdr, p_vaddr), offsetof(Elf64_Phdr, p_paddr), 149 offsetof(Elf64_Phdr, p_filesz), offsetof(Elf64_Phdr, p_memsz), 150 offsetof(Elf64_Phdr, p_flags), offsetof(Elf64_Phdr, p_align), 151 152 offsetof(Elf64_Shdr, sh_name), offsetof(Elf64_Shdr, sh_type), 153 offsetof(Elf64_Shdr, sh_flags), offsetof(Elf64_Shdr, sh_addr), 154 offsetof(Elf64_Shdr, sh_offset), offsetof(Elf64_Shdr, sh_size), 155 offsetof(Elf64_Shdr, sh_link), offsetof(Elf64_Shdr, sh_info), 156 offsetof(Elf64_Shdr, sh_addralign), offsetof(Elf64_Shdr, sh_entsize), 157 158 offsetof(Elf64_Sym, st_name), offsetof(Elf64_Sym, st_value), 159 offsetof(Elf64_Sym, st_size), offsetof(Elf64_Sym, st_info), 160 offsetof(Elf64_Sym, st_shndx), 161 162 offsetof(Elf64_Rel, r_offset), offsetof(Elf64_Rel, r_info), 163 164 offsetof(Elf64_Rela, r_offset), offsetof(Elf64_Rela, r_info), 165 offsetof(Elf64_Rela, r_addend) 166}; 167 168/* http://www.sco.com/developers/gabi/latest/ch5.dynamic.html#tag_encodings */ 169static const char * 170d_tags(u_int64_t tag) { 171 switch (tag) { 172 case 0: return "DT_NULL"; 173 case 1: return "DT_NEEDED"; 174 case 2: return "DT_PLTRELSZ"; 175 case 3: return "DT_PLTGOT"; 176 case 4: return "DT_HASH"; 177 case 5: return "DT_STRTAB"; 178 case 6: return "DT_SYMTAB"; 179 case 7: return "DT_RELA"; 180 case 8: return "DT_RELASZ"; 181 case 9: return "DT_RELAENT"; 182 case 10: return "DT_STRSZ"; 183 case 11: return "DT_SYMENT"; 184 case 12: return "DT_INIT"; 185 case 13: return "DT_FINI"; 186 case 14: return "DT_SONAME"; 187 case 15: return "DT_RPATH"; 188 case 16: return "DT_SYMBOLIC"; 189 case 17: return "DT_REL"; 190 case 18: return "DT_RELSZ"; 191 case 19: return "DT_RELENT"; 192 case 20: return "DT_PLTREL"; 193 case 21: return "DT_DEBUG"; 194 case 22: return "DT_TEXTREL"; 195 case 23: return "DT_JMPREL"; 196 case 24: return "DT_BIND_NOW"; 197 case 25: return "DT_INIT_ARRAY"; 198 case 26: return "DT_FINI_ARRAY"; 199 case 27: return "DT_INIT_ARRAYSZ"; 200 case 28: return "DT_FINI_ARRAYSZ"; 201 case 29: return "DT_RUNPATH"; 202 case 30: return "DT_FLAGS"; 203 case 32: return "DT_PREINIT_ARRAY"; /* XXX: DT_ENCODING */ 204 case 33: return "DT_PREINIT_ARRAYSZ"; 205 /* 0x6000000D - 0x6ffff000 operating system-specific semantics */ 206 case 0x6ffffdf5: return "DT_GNU_PRELINKED"; 207 case 0x6ffffdf6: return "DT_GNU_CONFLICTSZ"; 208 case 0x6ffffdf7: return "DT_GNU_LIBLISTSZ"; 209 case 0x6ffffdf8: return "DT_SUNW_CHECKSUM"; 210 case 0x6ffffdf9: return "DT_PLTPADSZ"; 211 case 0x6ffffdfa: return "DT_MOVEENT"; 212 case 0x6ffffdfb: return "DT_MOVESZ"; 213 case 0x6ffffdfc: return "DT_FEATURE"; 214 case 0x6ffffdfd: return "DT_POSFLAG_1"; 215 case 0x6ffffdfe: return "DT_SYMINSZ"; 216 case 0x6ffffdff: return "DT_SYMINENT (DT_VALRNGHI)"; 217 case 0x6ffffe00: return "DT_ADDRRNGLO"; 218 case 0x6ffffef8: return "DT_GNU_CONFLICT"; 219 case 0x6ffffef9: return "DT_GNU_LIBLIST"; 220 case 0x6ffffefa: return "DT_SUNW_CONFIG"; 221 case 0x6ffffefb: return "DT_SUNW_DEPAUDIT"; 222 case 0x6ffffefc: return "DT_SUNW_AUDIT"; 223 case 0x6ffffefd: return "DT_SUNW_PLTPAD"; 224 case 0x6ffffefe: return "DT_SUNW_MOVETAB"; 225 case 0x6ffffeff: return "DT_SYMINFO (DT_ADDRRNGHI)"; 226 case 0x6ffffff9: return "DT_RELACOUNT"; 227 case 0x6ffffffa: return "DT_RELCOUNT"; 228 case 0x6ffffffb: return "DT_FLAGS_1"; 229 case 0x6ffffffc: return "DT_VERDEF"; 230 case 0x6ffffffd: return "DT_VERDEFNUM"; 231 case 0x6ffffffe: return "DT_VERNEED"; 232 case 0x6fffffff: return "DT_VERNEEDNUM"; 233 case 0x6ffffff0: return "DT_GNU_VERSYM"; 234 /* 0x70000000 - 0x7fffffff processor-specific semantics */ 235 case 0x70000000: return "DT_IA64_PLT_RESERVE"; 236 case 0x7ffffffd: return "DT_SUNW_AUXILIARY"; 237 case 0x7ffffffe: return "DT_SUNW_USED"; 238 case 0x7fffffff: return "DT_SUNW_FILTER"; 239 default: return "ERROR: TAG NOT DEFINED"; 240 } 241} 242 243static const char * 244e_machines(u_int mach) 245{ 246 static char machdesc[64]; 247 248 switch (mach) { 249 case EM_NONE: return "EM_NONE"; 250 case EM_M32: return "EM_M32"; 251 case EM_SPARC: return "EM_SPARC"; 252 case EM_386: return "EM_386"; 253 case EM_68K: return "EM_68K"; 254 case EM_88K: return "EM_88K"; 255 case EM_860: return "EM_860"; 256 case EM_MIPS: return "EM_MIPS"; 257 case EM_PPC: return "EM_PPC"; 258 case EM_ARM: return "EM_ARM"; 259 case EM_ALPHA: return "EM_ALPHA (legacy)"; 260 case EM_SPARCV9:return "EM_SPARCV9"; 261 case EM_IA_64: return "EM_IA_64"; 262 case EM_X86_64: return "EM_X86_64"; 263 } 264 snprintf(machdesc, sizeof(machdesc), 265 "(unknown machine) -- type 0x%x", mach); 266 return (machdesc); 267} 268 269const char *e_types[] = { 270 "ET_NONE", "ET_REL", "ET_EXEC", "ET_DYN", "ET_CORE" 271}; 272 273const char *ei_versions[] = { 274 "EV_NONE", "EV_CURRENT" 275}; 276 277const char *ei_classes[] = { 278 "ELFCLASSNONE", "ELFCLASS32", "ELFCLASS64" 279}; 280 281const char *ei_data[] = { 282 "ELFDATANONE", "ELFDATA2LSB", "ELFDATA2MSB" 283}; 284 285const char *ei_abis[] = { 286 "ELFOSABI_SYSV", "ELFOSABI_HPUX", "ELFOSABI_NETBSD", "ELFOSABI_LINUX", 287 "ELFOSABI_HURD", "ELFOSABI_86OPEN", "ELFOSABI_SOLARIS", 288 "ELFOSABI_MONTEREY", "ELFOSABI_IRIX", "ELFOSABI_FREEBSD", 289 "ELFOSABI_TRU64", "ELFOSABI_MODESTO", "ELFOSABI_OPENBSD" 290}; 291 292const char *p_types[] = { 293 "PT_NULL", "PT_LOAD", "PT_DYNAMIC", "PT_INTERP", "PT_NOTE", 294 "PT_SHLIB", "PT_PHDR", "PT_TLS" 295}; 296 297const char *p_flags[] = { 298 "", "PF_X", "PF_W", "PF_X|PF_W", "PF_R", "PF_X|PF_R", "PF_W|PF_R", 299 "PF_X|PF_W|PF_R" 300}; 301 302/* http://www.sco.com/developers/gabi/latest/ch4.sheader.html#sh_type */ 303static const char * 304sh_types(u_int64_t sht) { 305 switch (sht) { 306 case 0: return "SHT_NULL"; 307 case 1: return "SHT_PROGBITS"; 308 case 2: return "SHT_SYMTAB"; 309 case 3: return "SHT_STRTAB"; 310 case 4: return "SHT_RELA"; 311 case 5: return "SHT_HASH"; 312 case 6: return "SHT_DYNAMIC"; 313 case 7: return "SHT_NOTE"; 314 case 8: return "SHT_NOBITS"; 315 case 9: return "SHT_REL"; 316 case 10: return "SHT_SHLIB"; 317 case 11: return "SHT_DYNSYM"; 318 case 14: return "SHT_INIT_ARRAY"; 319 case 15: return "SHT_FINI_ARRAY"; 320 case 16: return "SHT_PREINIT_ARRAY"; 321 case 17: return "SHT_GROUP"; 322 case 18: return "SHT_SYMTAB_SHNDX"; 323 /* 0x60000000 - 0x6fffffff operating system-specific semantics */ 324 case 0x6ffffff0: return "XXX:VERSYM"; 325 case 0x6ffffff7: return "SHT_GNU_LIBLIST"; 326 case 0x6ffffffc: return "XXX:VERDEF"; 327 case 0x6ffffffd: return "SHT_SUNW(GNU)_verdef"; 328 case 0x6ffffffe: return "SHT_SUNW(GNU)_verneed"; 329 case 0x6fffffff: return "SHT_SUNW(GNU)_versym"; 330 /* 0x70000000 - 0x7fffffff processor-specific semantics */ 331 case 0x70000000: return "SHT_IA_64_EXT"; 332 case 0x70000001: return "SHT_IA_64_UNWIND"; 333 case 0x7ffffffd: return "XXX:AUXILIARY"; 334 case 0x7fffffff: return "XXX:FILTER"; 335 /* 0x80000000 - 0xffffffff application programs */ 336 default: return "ERROR: SHT NOT DEFINED"; 337 } 338} 339 340const char *sh_flags[] = { 341 "", "SHF_WRITE", "SHF_ALLOC", "SHF_WRITE|SHF_ALLOC", "SHF_EXECINSTR", 342 "SHF_WRITE|SHF_EXECINSTR", "SHF_ALLOC|SHF_EXECINSTR", 343 "SHF_WRITE|SHF_ALLOC|SHF_EXECINSTR" 344}; 345 346const char *st_types[] = { 347 "STT_NOTYPE", "STT_OBJECT", "STT_FUNC", "STT_SECTION", "STT_FILE" 348}; 349 350const char *st_bindings[] = { 351 "STB_LOCAL", "STB_GLOBAL", "STB_WEAK" 352}; 353 354char *dynstr; 355char *shstrtab; 356char *strtab; 357FILE *out; 358 359u_int64_t elf_get_byte(Elf32_Ehdr *e, void *base, elf_member_t member); 360u_int64_t elf_get_quarter(Elf32_Ehdr *e, void *base, elf_member_t member); 361u_int64_t elf_get_half(Elf32_Ehdr *e, void *base, elf_member_t member); 362u_int64_t elf_get_word(Elf32_Ehdr *e, void *base, elf_member_t member); 363u_int64_t elf_get_quad(Elf32_Ehdr *e, void *base, elf_member_t member); 364 365void elf_print_ehdr(Elf32_Ehdr *e); 366void elf_print_phdr(Elf32_Ehdr *e, void *p); 367void elf_print_shdr(Elf32_Ehdr *e, void *sh); 368void elf_print_symtab(Elf32_Ehdr *e, void *sh, char *str); 369void elf_print_dynamic(Elf32_Ehdr *e, void *sh); 370void elf_print_rel(Elf32_Ehdr *e, void *r); 371void elf_print_rela(Elf32_Ehdr *e, void *ra); 372void elf_print_interp(Elf32_Ehdr *e, void *p); 373void elf_print_got(Elf32_Ehdr *e, void *sh); 374void elf_print_hash(Elf32_Ehdr *e, void *sh); 375void elf_print_note(Elf32_Ehdr *e, void *sh); 376 377void usage(void); 378 379int 380main(int ac, char **av) 381{ 382 u_int64_t phoff; 383 u_int64_t shoff; 384 u_int64_t phentsize; 385 u_int64_t phnum; 386 u_int64_t shentsize; 387 u_int64_t shnum; 388 u_int64_t shstrndx; 389 u_int64_t offset; 390 u_int64_t name; 391 u_int64_t type; 392 struct stat sb; 393 u_int flags; 394 Elf32_Ehdr *e; 395 void *p; 396 void *sh; 397 void *v; 398 int fd; 399 int ch; 400 int i; 401 402 out = stdout; 403 flags = 0; 404 while ((ch = getopt(ac, av, "acdeiGhnprsw:")) != -1) 405 switch (ch) { 406 case 'a': 407 flags = ED_ALL; 408 break; 409 case 'c': 410 flags |= ED_SHDR; 411 break; 412 case 'd': 413 flags |= ED_DYN; 414 break; 415 case 'e': 416 flags |= ED_EHDR; 417 break; 418 case 'i': 419 flags |= ED_INTERP; 420 break; 421 case 'G': 422 flags |= ED_GOT; 423 break; 424 case 'h': 425 flags |= ED_HASH; 426 break; 427 case 'n': 428 flags |= ED_NOTE; 429 break; 430 case 'p': 431 flags |= ED_PHDR; 432 break; 433 case 'r': 434 flags |= ED_REL; 435 break; 436 case 's': 437 flags |= ED_SYMTAB; 438 break; 439 case 'w': 440 if ((out = fopen(optarg, "w")) == NULL) 441 err(1, "%s", optarg); 442 break; 443 case '?': 444 default: 445 usage(); 446 } 447 ac -= optind; 448 av += optind; 449 if (ac == 0 || flags == 0) 450 usage(); 451 if ((fd = open(*av, O_RDONLY)) < 0 || 452 fstat(fd, &sb) < 0) 453 err(1, "%s", *av); 454 e = mmap(NULL, sb.st_size, PROT_READ, MAP_SHARED, fd, 0); 455 if (e == MAP_FAILED) 456 err(1, NULL); 457 if (!IS_ELF(*(Elf32_Ehdr *)e)) 458 errx(1, "not an elf file"); 459 phoff = elf_get_off(e, e, E_PHOFF); 460 shoff = elf_get_off(e, e, E_SHOFF); 461 phentsize = elf_get_quarter(e, e, E_PHENTSIZE); 462 phnum = elf_get_quarter(e, e, E_PHNUM); 463 shentsize = elf_get_quarter(e, e, E_SHENTSIZE); 464 shnum = elf_get_quarter(e, e, E_SHNUM); 465 shstrndx = elf_get_quarter(e, e, E_SHSTRNDX); 466 p = (char *)e + phoff; 467 sh = (char *)e + shoff; 468 offset = elf_get_off(e, (char *)sh + shstrndx * shentsize, SH_OFFSET); 469 shstrtab = (char *)e + offset; 470 for (i = 0; (u_int64_t)i < shnum; i++) { 471 name = elf_get_word(e, (char *)sh + i * shentsize, SH_NAME); 472 offset = elf_get_off(e, (char *)sh + i * shentsize, SH_OFFSET); 473 if (strcmp(shstrtab + name, ".strtab") == 0) 474 strtab = (char *)e + offset; 475 if (strcmp(shstrtab + name, ".dynstr") == 0) 476 dynstr = (char *)e + offset; 477 } 478 if (flags & ED_EHDR) 479 elf_print_ehdr(e); 480 if (flags & ED_PHDR) 481 elf_print_phdr(e, p); 482 if (flags & ED_SHDR) 483 elf_print_shdr(e, sh); 484 for (i = 0; (u_int64_t)i < phnum; i++) { 485 v = (char *)p + i * phentsize; 486 type = elf_get_word(e, v, P_TYPE); 487 switch (type) { 488 case PT_INTERP: 489 if (flags & ED_INTERP) 490 elf_print_interp(e, v); 491 break; 492 case PT_NULL: 493 case PT_LOAD: 494 case PT_DYNAMIC: 495 case PT_NOTE: 496 case PT_SHLIB: 497 case PT_PHDR: 498 break; 499 } 500 } 501 for (i = 0; (u_int64_t)i < shnum; i++) { 502 v = (char *)sh + i * shentsize; 503 type = elf_get_word(e, v, SH_TYPE); 504 switch (type) { 505 case SHT_SYMTAB: 506 if (flags & ED_SYMTAB) 507 elf_print_symtab(e, v, strtab); 508 break; 509 case SHT_DYNAMIC: 510 if (flags & ED_DYN) 511 elf_print_dynamic(e, v); 512 break; 513 case SHT_RELA: 514 if (flags & ED_REL) 515 elf_print_rela(e, v); 516 break; 517 case SHT_REL: 518 if (flags & ED_REL) 519 elf_print_rel(e, v); 520 break; 521 case SHT_NOTE: 522 name = elf_get_word(e, v, SH_NAME); 523 if (flags & ED_NOTE && 524 strcmp(shstrtab + name, ".note.ABI-tag") == 0) 525 elf_print_note(e, v); 526 break; 527 case SHT_DYNSYM: 528 if (flags & ED_SYMTAB) 529 elf_print_symtab(e, v, dynstr); 530 break; 531 case SHT_PROGBITS: 532 name = elf_get_word(e, v, SH_NAME); 533 if (flags & ED_GOT && 534 strcmp(shstrtab + name, ".got") == 0) 535 elf_print_got(e, v); 536 break; 537 case SHT_HASH: 538 if (flags & ED_HASH) 539 elf_print_hash(e, v); 540 break; 541 case SHT_NULL: 542 case SHT_STRTAB: 543 case SHT_NOBITS: 544 case SHT_SHLIB: 545 break; 546 } 547 } 548 549 return 0; 550} 551 552void 553elf_print_ehdr(Elf32_Ehdr *e) 554{ 555 u_int64_t class; 556 u_int64_t data; 557 u_int64_t osabi; 558 u_int64_t type; 559 u_int64_t machine; 560 u_int64_t version; 561 u_int64_t entry; 562 u_int64_t phoff; 563 u_int64_t shoff; 564 u_int64_t flags; 565 u_int64_t ehsize; 566 u_int64_t phentsize; 567 u_int64_t phnum; 568 u_int64_t shentsize; 569 u_int64_t shnum; 570 u_int64_t shstrndx; 571 572 class = elf_get_byte(e, e, E_CLASS); 573 data = elf_get_byte(e, e, E_DATA); 574 osabi = elf_get_byte(e, e, E_OSABI); 575 type = elf_get_quarter(e, e, E_TYPE); 576 machine = elf_get_quarter(e, e, E_MACHINE); 577 version = elf_get_word(e, e, E_VERSION); 578 entry = elf_get_addr(e, e, E_ENTRY); 579 phoff = elf_get_off(e, e, E_PHOFF); 580 shoff = elf_get_off(e, e, E_SHOFF); 581 flags = elf_get_word(e, e, E_FLAGS); 582 ehsize = elf_get_quarter(e, e, E_EHSIZE); 583 phentsize = elf_get_quarter(e, e, E_PHENTSIZE); 584 phnum = elf_get_quarter(e, e, E_PHNUM); 585 shentsize = elf_get_quarter(e, e, E_SHENTSIZE); 586 shnum = elf_get_quarter(e, e, E_SHNUM); 587 shstrndx = elf_get_quarter(e, e, E_SHSTRNDX); 588 fprintf(out, "\nelf header:\n"); 589 fprintf(out, "\n"); 590 fprintf(out, "\te_ident: %s %s %s\n", ei_classes[class], ei_data[data], 591 ei_abis[osabi]); 592 fprintf(out, "\te_type: %s\n", e_types[type]); 593 fprintf(out, "\te_machine: %s\n", e_machines(machine)); 594 fprintf(out, "\te_version: %s\n", ei_versions[version]); 595 fprintf(out, "\te_entry: %#jx\n", (intmax_t)entry); 596 fprintf(out, "\te_phoff: %jd\n", (intmax_t)phoff); 597 fprintf(out, "\te_shoff: %jd\n", (intmax_t)shoff); 598 fprintf(out, "\te_flags: %jd\n", (intmax_t)flags); 599 fprintf(out, "\te_ehsize: %jd\n", (intmax_t)ehsize); 600 fprintf(out, "\te_phentsize: %jd\n", (intmax_t)phentsize); 601 fprintf(out, "\te_phnum: %jd\n", (intmax_t)phnum); 602 fprintf(out, "\te_shentsize: %jd\n", (intmax_t)shentsize); 603 fprintf(out, "\te_shnum: %jd\n", (intmax_t)shnum); 604 fprintf(out, "\te_shstrndx: %jd\n", (intmax_t)shstrndx); 605} 606 607void 608elf_print_phdr(Elf32_Ehdr *e, void *p) 609{ 610 u_int64_t phentsize; 611 u_int64_t phnum; 612 u_int64_t type; 613 u_int64_t offset; 614 u_int64_t vaddr; 615 u_int64_t paddr; 616 u_int64_t filesz; 617 u_int64_t memsz; 618 u_int64_t flags; 619 u_int64_t align; 620 void *v; 621 int i; 622 623 phentsize = elf_get_quarter(e, e, E_PHENTSIZE); 624 phnum = elf_get_quarter(e, e, E_PHNUM); 625 fprintf(out, "\nprogram header:\n"); 626 for (i = 0; (u_int64_t)i < phnum; i++) { 627 v = (char *)p + i * phentsize; 628 type = elf_get_word(e, v, P_TYPE); 629 offset = elf_get_off(e, v, P_OFFSET); 630 vaddr = elf_get_addr(e, v, P_VADDR); 631 paddr = elf_get_addr(e, v, P_PADDR); 632 filesz = elf_get_size(e, v, P_FILESZ); 633 memsz = elf_get_size(e, v, P_MEMSZ); 634 flags = elf_get_word(e, v, P_FLAGS); 635 align = elf_get_size(e, v, P_ALIGN); 636 fprintf(out, "\n"); 637 fprintf(out, "entry: %d\n", i); 638 fprintf(out, "\tp_type: %s\n", p_types[type & 0x7]); 639 fprintf(out, "\tp_offset: %jd\n", (intmax_t)offset); 640 fprintf(out, "\tp_vaddr: %#jx\n", (intmax_t)vaddr); 641 fprintf(out, "\tp_paddr: %#jx\n", (intmax_t)paddr); 642 fprintf(out, "\tp_filesz: %jd\n", (intmax_t)filesz); 643 fprintf(out, "\tp_memsz: %jd\n", (intmax_t)memsz); 644 fprintf(out, "\tp_flags: %s\n", p_flags[flags]); 645 fprintf(out, "\tp_align: %jd\n", (intmax_t)align); 646 } 647} 648 649void 650elf_print_shdr(Elf32_Ehdr *e, void *sh) 651{ 652 u_int64_t shentsize; 653 u_int64_t shnum; 654 u_int64_t name; 655 u_int64_t type; 656 u_int64_t flags; 657 u_int64_t addr; 658 u_int64_t offset; 659 u_int64_t size; 660 u_int64_t shlink; 661 u_int64_t info; 662 u_int64_t addralign; 663 u_int64_t entsize; 664 void *v; 665 int i; 666 667 shentsize = elf_get_quarter(e, e, E_SHENTSIZE); 668 shnum = elf_get_quarter(e, e, E_SHNUM); 669 fprintf(out, "\nsection header:\n"); 670 for (i = 0; (u_int64_t)i < shnum; i++) { 671 v = (char *)sh + i * shentsize; 672 name = elf_get_word(e, v, SH_NAME); 673 type = elf_get_word(e, v, SH_TYPE); 674 flags = elf_get_word(e, v, SH_FLAGS); 675 addr = elf_get_addr(e, v, SH_ADDR); 676 offset = elf_get_off(e, v, SH_OFFSET); 677 size = elf_get_size(e, v, SH_SIZE); 678 shlink = elf_get_word(e, v, SH_LINK); 679 info = elf_get_word(e, v, SH_INFO); 680 addralign = elf_get_size(e, v, SH_ADDRALIGN); 681 entsize = elf_get_size(e, v, SH_ENTSIZE); 682 fprintf(out, "\n"); 683 fprintf(out, "entry: %d\n", i); 684 fprintf(out, "\tsh_name: %s\n", shstrtab + name); 685 fprintf(out, "\tsh_type: %s\n", sh_types(type)); 686 fprintf(out, "\tsh_flags: %s\n", sh_flags[flags & 0x7]); 687 fprintf(out, "\tsh_addr: %#jx\n", addr); 688 fprintf(out, "\tsh_offset: %jd\n", (intmax_t)offset); 689 fprintf(out, "\tsh_size: %jd\n", (intmax_t)size); 690 fprintf(out, "\tsh_link: %jd\n", (intmax_t)shlink); 691 fprintf(out, "\tsh_info: %jd\n", (intmax_t)info); 692 fprintf(out, "\tsh_addralign: %jd\n", (intmax_t)addralign); 693 fprintf(out, "\tsh_entsize: %jd\n", (intmax_t)entsize); 694 } 695} 696 697void 698elf_print_symtab(Elf32_Ehdr *e, void *sh, char *str) 699{ 700 u_int64_t offset; 701 u_int64_t entsize; 702 u_int64_t size; 703 u_int64_t name; 704 u_int64_t value; 705 u_int64_t info; 706 u_int64_t shndx; 707 void *st; 708 int len; 709 int i; 710 711 offset = elf_get_off(e, sh, SH_OFFSET); 712 entsize = elf_get_size(e, sh, SH_ENTSIZE); 713 size = elf_get_size(e, sh, SH_SIZE); 714 name = elf_get_word(e, sh, SH_NAME); 715 len = size / entsize; 716 fprintf(out, "\nsymbol table (%s):\n", shstrtab + name); 717 for (i = 0; i < len; i++) { 718 st = (char *)e + offset + i * entsize; 719 name = elf_get_word(e, st, ST_NAME); 720 value = elf_get_addr(e, st, ST_VALUE); 721 size = elf_get_size(e, st, ST_SIZE); 722 info = elf_get_byte(e, st, ST_INFO); 723 shndx = elf_get_quarter(e, st, ST_SHNDX); 724 fprintf(out, "\n"); 725 fprintf(out, "entry: %d\n", i); 726 fprintf(out, "\tst_name: %s\n", str + name); 727 fprintf(out, "\tst_value: %#jx\n", value); 728 fprintf(out, "\tst_size: %jd\n", (intmax_t)size); 729 fprintf(out, "\tst_info: %s %s\n", 730 st_types[ELF32_ST_TYPE(info)], 731 st_bindings[ELF32_ST_BIND(info)]); 732 fprintf(out, "\tst_shndx: %jd\n", (intmax_t)shndx); 733 } 734} 735 736void 737elf_print_dynamic(Elf32_Ehdr *e, void *sh) 738{ 739 u_int64_t offset; 740 u_int64_t entsize; 741 u_int64_t size; 742 int64_t tag; 743 u_int64_t ptr; 744 u_int64_t val; 745 void *d; 746 int i; 747 748 offset = elf_get_off(e, sh, SH_OFFSET); 749 entsize = elf_get_size(e, sh, SH_ENTSIZE); 750 size = elf_get_size(e, sh, SH_SIZE); 751 fprintf(out, "\ndynamic:\n"); 752 for (i = 0; (u_int64_t)i < size / entsize; i++) { 753 d = (char *)e + offset + i * entsize; 754 tag = elf_get_size(e, d, D_TAG); 755 ptr = elf_get_size(e, d, D_PTR); 756 val = elf_get_addr(e, d, D_VAL); 757 fprintf(out, "\n"); 758 fprintf(out, "entry: %d\n", i); 759 fprintf(out, "\td_tag: %s\n", d_tags(tag)); 760 switch (tag) { 761 case DT_NEEDED: 762 case DT_SONAME: 763 case DT_RPATH: 764 fprintf(out, "\td_val: %s\n", dynstr + val); 765 break; 766 case DT_PLTRELSZ: 767 case DT_RELA: 768 case DT_RELASZ: 769 case DT_RELAENT: 770 case DT_STRSZ: 771 case DT_SYMENT: 772 case DT_RELSZ: 773 case DT_RELENT: 774 case DT_PLTREL: 775 fprintf(out, "\td_val: %jd\n", (intmax_t)val); 776 break; 777 case DT_PLTGOT: 778 case DT_HASH: 779 case DT_STRTAB: 780 case DT_SYMTAB: 781 case DT_INIT: 782 case DT_FINI: 783 case DT_REL: 784 case DT_JMPREL: 785 fprintf(out, "\td_ptr: %#jx\n", ptr); 786 break; 787 case DT_NULL: 788 case DT_SYMBOLIC: 789 case DT_DEBUG: 790 case DT_TEXTREL: 791 break; 792 } 793 } 794} 795 796void 797elf_print_rela(Elf32_Ehdr *e, void *sh) 798{ 799 u_int64_t offset; 800 u_int64_t entsize; 801 u_int64_t size; 802 u_int64_t name; 803 u_int64_t info; 804 int64_t addend; 805 void *ra; 806 void *v; 807 int i; 808 809 offset = elf_get_off(e, sh, SH_OFFSET); 810 entsize = elf_get_size(e, sh, SH_ENTSIZE); 811 size = elf_get_size(e, sh, SH_SIZE); 812 name = elf_get_word(e, sh, SH_NAME); 813 v = (char *)e + offset; 814 fprintf(out, "\nrelocation with addend (%s):\n", shstrtab + name); 815 for (i = 0; (u_int64_t)i < size / entsize; i++) { 816 ra = (char *)v + i * entsize; 817 offset = elf_get_addr(e, ra, RA_OFFSET); 818 info = elf_get_word(e, ra, RA_INFO); 819 addend = elf_get_off(e, ra, RA_ADDEND); 820 fprintf(out, "\n"); 821 fprintf(out, "entry: %d\n", i); 822 fprintf(out, "\tr_offset: %#jx\n", offset); 823 fprintf(out, "\tr_info: %jd\n", (intmax_t)info); 824 fprintf(out, "\tr_addend: %jd\n", (intmax_t)addend); 825 } 826} 827 828void 829elf_print_rel(Elf32_Ehdr *e, void *sh) 830{ 831 u_int64_t offset; 832 u_int64_t entsize; 833 u_int64_t size; 834 u_int64_t name; 835 u_int64_t info; 836 void *r; 837 void *v; 838 int i; 839 840 offset = elf_get_off(e, sh, SH_OFFSET); 841 entsize = elf_get_size(e, sh, SH_ENTSIZE); 842 size = elf_get_size(e, sh, SH_SIZE); 843 name = elf_get_word(e, sh, SH_NAME); 844 v = (char *)e + offset; 845 fprintf(out, "\nrelocation (%s):\n", shstrtab + name); 846 for (i = 0; (u_int64_t)i < size / entsize; i++) { 847 r = (char *)v + i * entsize; 848 offset = elf_get_addr(e, r, R_OFFSET); 849 info = elf_get_word(e, r, R_INFO); 850 fprintf(out, "\n"); 851 fprintf(out, "entry: %d\n", i); 852 fprintf(out, "\tr_offset: %#jx\n", offset); 853 fprintf(out, "\tr_info: %jd\n", (intmax_t)info); 854 } 855} 856 857void 858elf_print_interp(Elf32_Ehdr *e, void *p) 859{ 860 u_int64_t offset; 861 char *s; 862 863 offset = elf_get_off(e, p, P_OFFSET); 864 s = (char *)e + offset; 865 fprintf(out, "\ninterp:\n"); 866 fprintf(out, "\t%s\n", s); 867} 868 869void 870elf_print_got(Elf32_Ehdr *e, void *sh) 871{ 872 u_int64_t offset; 873 u_int64_t addralign; 874 u_int64_t size; 875 u_int64_t addr; 876 void *v; 877 int i; 878 879 offset = elf_get_off(e, sh, SH_OFFSET); 880 addralign = elf_get_size(e, sh, SH_ADDRALIGN); 881 size = elf_get_size(e, sh, SH_SIZE); 882 v = (char *)e + offset; 883 fprintf(out, "\nglobal offset table:\n"); 884 for (i = 0; (u_int64_t)i < size / addralign; i++) { 885 addr = elf_get_addr(e, (char *)v + i * addralign, 0); 886 fprintf(out, "\n"); 887 fprintf(out, "entry: %d\n", i); 888 fprintf(out, "\t%#jx\n", addr); 889 } 890} 891 892void 893elf_print_hash(Elf32_Ehdr *e __unused, void *sh __unused) 894{ 895} 896 897void 898elf_print_note(Elf32_Ehdr *e, void *sh) 899{ 900 u_int64_t offset; 901 u_int64_t size; 902 u_int64_t name; 903 u_int32_t namesz; 904 u_int32_t descsz; 905 u_int32_t type; 906 u_int32_t desc; 907 char *n, *s; 908 909 offset = elf_get_off(e, sh, SH_OFFSET); 910 size = elf_get_size(e, sh, SH_SIZE); 911 name = elf_get_word(e, sh, SH_NAME); 912 n = (char *)e + offset; 913 fprintf(out, "\nnote (%s):\n", shstrtab + name); 914 while (n < ((char *)e + offset + size)) { 915 namesz = elf_get_word(e, n, N_NAMESZ); 916 descsz = elf_get_word(e, n, N_DESCSZ); 917 type = elf_get_word(e, n, N_TYPE); 918 s = n + sizeof(Elf_Note); 919 desc = elf_get_word(e, n + sizeof(Elf_Note) + namesz, 0); 920 fprintf(out, "\t%s %d\n", s, desc); 921 n += sizeof(Elf_Note) + namesz + descsz; 922 } 923} 924 925u_int64_t 926elf_get_byte(Elf32_Ehdr *e, void *base, elf_member_t member) 927{ 928 u_int64_t val; 929 930 val = 0; 931 switch (e->e_ident[EI_CLASS]) { 932 case ELFCLASS32: 933 val = ((char *)base)[elf32_offsets[member]]; 934 break; 935 case ELFCLASS64: 936 val = ((char *)base)[elf64_offsets[member]]; 937 break; 938 case ELFCLASSNONE: 939 errx(1, "invalid class"); 940 } 941 942 return val; 943} 944 945u_int64_t 946elf_get_quarter(Elf32_Ehdr *e, void *base, elf_member_t member) 947{ 948 u_int64_t val; 949 950 val = 0; 951 switch (e->e_ident[EI_CLASS]) { 952 case ELFCLASS32: 953 base = (char *)base + elf32_offsets[member]; 954 switch (e->e_ident[EI_DATA]) { 955 case ELFDATA2MSB: 956 val = be16dec(base); 957 break; 958 case ELFDATA2LSB: 959 val = le16dec(base); 960 break; 961 case ELFDATANONE: 962 errx(1, "invalid data format"); 963 } 964 break; 965 case ELFCLASS64: 966 base = (char *)base + elf64_offsets[member]; 967 switch (e->e_ident[EI_DATA]) { 968 case ELFDATA2MSB: 969 val = be16dec(base); 970 break; 971 case ELFDATA2LSB: 972 val = le16dec(base); 973 break; 974 case ELFDATANONE: 975 errx(1, "invalid data format"); 976 } 977 break; 978 case ELFCLASSNONE: 979 errx(1, "invalid class"); 980 } 981 982 return val; 983} 984 985u_int64_t 986elf_get_half(Elf32_Ehdr *e, void *base, elf_member_t member) 987{ 988 u_int64_t val; 989 990 val = 0; 991 switch (e->e_ident[EI_CLASS]) { 992 case ELFCLASS32: 993 base = (char *)base + elf32_offsets[member]; 994 switch (e->e_ident[EI_DATA]) { 995 case ELFDATA2MSB: 996 val = be16dec(base); 997 break; 998 case ELFDATA2LSB: 999 val = le16dec(base); 1000 break; 1001 case ELFDATANONE: 1002 errx(1, "invalid data format"); 1003 } 1004 break; 1005 case ELFCLASS64: 1006 base = (char *)base + elf64_offsets[member]; 1007 switch (e->e_ident[EI_DATA]) { 1008 case ELFDATA2MSB: 1009 val = be32dec(base); 1010 break; 1011 case ELFDATA2LSB: 1012 val = le32dec(base); 1013 break; 1014 case ELFDATANONE: 1015 errx(1, "invalid data format"); 1016 } 1017 break; 1018 case ELFCLASSNONE: 1019 errx(1, "invalid class"); 1020 } 1021 1022 return val; 1023} 1024 1025u_int64_t 1026elf_get_word(Elf32_Ehdr *e, void *base, elf_member_t member) 1027{ 1028 u_int64_t val; 1029 1030 val = 0; 1031 switch (e->e_ident[EI_CLASS]) { 1032 case ELFCLASS32: 1033 base = (char *)base + elf32_offsets[member]; 1034 switch (e->e_ident[EI_DATA]) { 1035 case ELFDATA2MSB: 1036 val = be32dec(base); 1037 break; 1038 case ELFDATA2LSB: 1039 val = le32dec(base); 1040 break; 1041 case ELFDATANONE: 1042 errx(1, "invalid data format"); 1043 } 1044 break; 1045 case ELFCLASS64: 1046 base = (char *)base + elf64_offsets[member]; 1047 switch (e->e_ident[EI_DATA]) { 1048 case ELFDATA2MSB: 1049 val = be32dec(base); 1050 break; 1051 case ELFDATA2LSB: 1052 val = le32dec(base); 1053 break; 1054 case ELFDATANONE: 1055 errx(1, "invalid data format"); 1056 } 1057 break; 1058 case ELFCLASSNONE: 1059 errx(1, "invalid class"); 1060 } 1061 1062 return val; 1063} 1064 1065u_int64_t 1066elf_get_quad(Elf32_Ehdr *e, void *base, elf_member_t member) 1067{ 1068 u_int64_t val; 1069 1070 val = 0; 1071 switch (e->e_ident[EI_CLASS]) { 1072 case ELFCLASS32: 1073 base = (char *)base + elf32_offsets[member]; 1074 switch (e->e_ident[EI_DATA]) { 1075 case ELFDATA2MSB: 1076 val = be32dec(base); 1077 break; 1078 case ELFDATA2LSB: 1079 val = le32dec(base); 1080 break; 1081 case ELFDATANONE: 1082 errx(1, "invalid data format"); 1083 } 1084 break; 1085 case ELFCLASS64: 1086 base = (char *)base + elf64_offsets[member]; 1087 switch (e->e_ident[EI_DATA]) { 1088 case ELFDATA2MSB: 1089 val = be64dec(base); 1090 break; 1091 case ELFDATA2LSB: 1092 val = le64dec(base); 1093 break; 1094 case ELFDATANONE: 1095 errx(1, "invalid data format"); 1096 } 1097 break; 1098 case ELFCLASSNONE: 1099 errx(1, "invalid class"); 1100 } 1101 1102 return val; 1103} 1104 1105void 1106usage(void) 1107{ 1108 fprintf(stderr, "usage: elfdump -a | -cdeGhinprs [-w file] file\n"); 1109 exit(1); 1110} 1111