elfdump.c revision 288173
1/*- 2 * Copyright (c) 2003 David O'Brien. All rights reserved. 3 * Copyright (c) 2001 Jake Burkholder 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28#include <sys/cdefs.h> 29__FBSDID("$FreeBSD: stable/10/usr.bin/elfdump/elfdump.c 288173 2015-09-24 12:54:50Z emaste $"); 30 31#include <sys/types.h> 32 33#include <sys/capability.h> 34#include <sys/elf32.h> 35#include <sys/elf64.h> 36#include <sys/endian.h> 37#include <sys/mman.h> 38#include <sys/stat.h> 39#include <err.h> 40#include <errno.h> 41#include <fcntl.h> 42#include <inttypes.h> 43#include <stddef.h> 44#include <stdio.h> 45#include <stdlib.h> 46#include <string.h> 47#include <unistd.h> 48 49#define ED_DYN (1<<0) 50#define ED_EHDR (1<<1) 51#define ED_GOT (1<<2) 52#define ED_HASH (1<<3) 53#define ED_INTERP (1<<4) 54#define ED_NOTE (1<<5) 55#define ED_PHDR (1<<6) 56#define ED_REL (1<<7) 57#define ED_SHDR (1<<8) 58#define ED_SYMTAB (1<<9) 59#define ED_ALL ((1<<10)-1) 60 61#define elf_get_addr elf_get_quad 62#define elf_get_off elf_get_quad 63#define elf_get_size elf_get_quad 64 65enum elf_member { 66 D_TAG = 1, D_PTR, D_VAL, 67 68 E_CLASS, E_DATA, E_OSABI, E_TYPE, E_MACHINE, E_VERSION, E_ENTRY, 69 E_PHOFF, E_SHOFF, E_FLAGS, E_EHSIZE, E_PHENTSIZE, E_PHNUM, E_SHENTSIZE, 70 E_SHNUM, E_SHSTRNDX, 71 72 N_NAMESZ, N_DESCSZ, N_TYPE, 73 74 P_TYPE, P_OFFSET, P_VADDR, P_PADDR, P_FILESZ, P_MEMSZ, P_FLAGS, 75 P_ALIGN, 76 77 SH_NAME, SH_TYPE, SH_FLAGS, SH_ADDR, SH_OFFSET, SH_SIZE, SH_LINK, 78 SH_INFO, SH_ADDRALIGN, SH_ENTSIZE, 79 80 ST_NAME, ST_VALUE, ST_SIZE, ST_INFO, ST_SHNDX, 81 82 R_OFFSET, R_INFO, 83 84 RA_OFFSET, RA_INFO, RA_ADDEND 85}; 86 87typedef enum elf_member elf_member_t; 88 89static int elf32_offsets[] = { 90 0, 91 92 offsetof(Elf32_Dyn, d_tag), offsetof(Elf32_Dyn, d_un.d_ptr), 93 offsetof(Elf32_Dyn, d_un.d_val), 94 95 offsetof(Elf32_Ehdr, e_ident[EI_CLASS]), 96 offsetof(Elf32_Ehdr, e_ident[EI_DATA]), 97 offsetof(Elf32_Ehdr, e_ident[EI_OSABI]), 98 offsetof(Elf32_Ehdr, e_type), offsetof(Elf32_Ehdr, e_machine), 99 offsetof(Elf32_Ehdr, e_version), offsetof(Elf32_Ehdr, e_entry), 100 offsetof(Elf32_Ehdr, e_phoff), offsetof(Elf32_Ehdr, e_shoff), 101 offsetof(Elf32_Ehdr, e_flags), offsetof(Elf32_Ehdr, e_ehsize), 102 offsetof(Elf32_Ehdr, e_phentsize), offsetof(Elf32_Ehdr, e_phnum), 103 offsetof(Elf32_Ehdr, e_shentsize), offsetof(Elf32_Ehdr, e_shnum), 104 offsetof(Elf32_Ehdr, e_shstrndx), 105 106 offsetof(Elf_Note, n_namesz), offsetof(Elf_Note, n_descsz), 107 offsetof(Elf_Note, n_type), 108 109 offsetof(Elf32_Phdr, p_type), offsetof(Elf32_Phdr, p_offset), 110 offsetof(Elf32_Phdr, p_vaddr), offsetof(Elf32_Phdr, p_paddr), 111 offsetof(Elf32_Phdr, p_filesz), offsetof(Elf32_Phdr, p_memsz), 112 offsetof(Elf32_Phdr, p_flags), offsetof(Elf32_Phdr, p_align), 113 114 offsetof(Elf32_Shdr, sh_name), offsetof(Elf32_Shdr, sh_type), 115 offsetof(Elf32_Shdr, sh_flags), offsetof(Elf32_Shdr, sh_addr), 116 offsetof(Elf32_Shdr, sh_offset), offsetof(Elf32_Shdr, sh_size), 117 offsetof(Elf32_Shdr, sh_link), offsetof(Elf32_Shdr, sh_info), 118 offsetof(Elf32_Shdr, sh_addralign), offsetof(Elf32_Shdr, sh_entsize), 119 120 offsetof(Elf32_Sym, st_name), offsetof(Elf32_Sym, st_value), 121 offsetof(Elf32_Sym, st_size), offsetof(Elf32_Sym, st_info), 122 offsetof(Elf32_Sym, st_shndx), 123 124 offsetof(Elf32_Rel, r_offset), offsetof(Elf32_Rel, r_info), 125 126 offsetof(Elf32_Rela, r_offset), offsetof(Elf32_Rela, r_info), 127 offsetof(Elf32_Rela, r_addend) 128}; 129 130static int elf64_offsets[] = { 131 0, 132 133 offsetof(Elf64_Dyn, d_tag), offsetof(Elf64_Dyn, d_un.d_ptr), 134 offsetof(Elf64_Dyn, d_un.d_val), 135 136 offsetof(Elf32_Ehdr, e_ident[EI_CLASS]), 137 offsetof(Elf32_Ehdr, e_ident[EI_DATA]), 138 offsetof(Elf32_Ehdr, e_ident[EI_OSABI]), 139 offsetof(Elf64_Ehdr, e_type), offsetof(Elf64_Ehdr, e_machine), 140 offsetof(Elf64_Ehdr, e_version), offsetof(Elf64_Ehdr, e_entry), 141 offsetof(Elf64_Ehdr, e_phoff), offsetof(Elf64_Ehdr, e_shoff), 142 offsetof(Elf64_Ehdr, e_flags), offsetof(Elf64_Ehdr, e_ehsize), 143 offsetof(Elf64_Ehdr, e_phentsize), offsetof(Elf64_Ehdr, e_phnum), 144 offsetof(Elf64_Ehdr, e_shentsize), offsetof(Elf64_Ehdr, e_shnum), 145 offsetof(Elf64_Ehdr, e_shstrndx), 146 147 offsetof(Elf_Note, n_namesz), offsetof(Elf_Note, n_descsz), 148 offsetof(Elf_Note, n_type), 149 150 offsetof(Elf64_Phdr, p_type), offsetof(Elf64_Phdr, p_offset), 151 offsetof(Elf64_Phdr, p_vaddr), offsetof(Elf64_Phdr, p_paddr), 152 offsetof(Elf64_Phdr, p_filesz), offsetof(Elf64_Phdr, p_memsz), 153 offsetof(Elf64_Phdr, p_flags), offsetof(Elf64_Phdr, p_align), 154 155 offsetof(Elf64_Shdr, sh_name), offsetof(Elf64_Shdr, sh_type), 156 offsetof(Elf64_Shdr, sh_flags), offsetof(Elf64_Shdr, sh_addr), 157 offsetof(Elf64_Shdr, sh_offset), offsetof(Elf64_Shdr, sh_size), 158 offsetof(Elf64_Shdr, sh_link), offsetof(Elf64_Shdr, sh_info), 159 offsetof(Elf64_Shdr, sh_addralign), offsetof(Elf64_Shdr, sh_entsize), 160 161 offsetof(Elf64_Sym, st_name), offsetof(Elf64_Sym, st_value), 162 offsetof(Elf64_Sym, st_size), offsetof(Elf64_Sym, st_info), 163 offsetof(Elf64_Sym, st_shndx), 164 165 offsetof(Elf64_Rel, r_offset), offsetof(Elf64_Rel, r_info), 166 167 offsetof(Elf64_Rela, r_offset), offsetof(Elf64_Rela, r_info), 168 offsetof(Elf64_Rela, r_addend) 169}; 170 171/* http://www.sco.com/developers/gabi/latest/ch5.dynamic.html#tag_encodings */ 172static const char * 173d_tags(u_int64_t tag) 174{ 175 static char unknown_tag[48]; 176 177 switch (tag) { 178 case DT_NULL: return "DT_NULL"; 179 case DT_NEEDED: return "DT_NEEDED"; 180 case DT_PLTRELSZ: return "DT_PLTRELSZ"; 181 case DT_PLTGOT: return "DT_PLTGOT"; 182 case DT_HASH: return "DT_HASH"; 183 case DT_STRTAB: return "DT_STRTAB"; 184 case DT_SYMTAB: return "DT_SYMTAB"; 185 case DT_RELA: return "DT_RELA"; 186 case DT_RELASZ: return "DT_RELASZ"; 187 case DT_RELAENT: return "DT_RELAENT"; 188 case DT_STRSZ: return "DT_STRSZ"; 189 case DT_SYMENT: return "DT_SYMENT"; 190 case DT_INIT: return "DT_INIT"; 191 case DT_FINI: return "DT_FINI"; 192 case DT_SONAME: return "DT_SONAME"; 193 case DT_RPATH: return "DT_RPATH"; 194 case DT_SYMBOLIC: return "DT_SYMBOLIC"; 195 case DT_REL: return "DT_REL"; 196 case DT_RELSZ: return "DT_RELSZ"; 197 case DT_RELENT: return "DT_RELENT"; 198 case DT_PLTREL: return "DT_PLTREL"; 199 case DT_DEBUG: return "DT_DEBUG"; 200 case DT_TEXTREL: return "DT_TEXTREL"; 201 case DT_JMPREL: return "DT_JMPREL"; 202 case DT_BIND_NOW: return "DT_BIND_NOW"; 203 case DT_INIT_ARRAY: return "DT_INIT_ARRAY"; 204 case DT_FINI_ARRAY: return "DT_FINI_ARRAY"; 205 case DT_INIT_ARRAYSZ: return "DT_INIT_ARRAYSZ"; 206 case DT_FINI_ARRAYSZ: return "DT_FINI_ARRAYSZ"; 207 case DT_RUNPATH: return "DT_RUNPATH"; 208 case DT_FLAGS: return "DT_FLAGS"; 209 case DT_PREINIT_ARRAY: return "DT_PREINIT_ARRAY"; /* XXX DT_ENCODING */ 210 case DT_PREINIT_ARRAYSZ:return "DT_PREINIT_ARRAYSZ"; 211 /* 0x6000000D - 0x6ffff000 operating system-specific semantics */ 212 case 0x6ffffdf5: return "DT_GNU_PRELINKED"; 213 case 0x6ffffdf6: return "DT_GNU_CONFLICTSZ"; 214 case 0x6ffffdf7: return "DT_GNU_LIBLISTSZ"; 215 case 0x6ffffdf8: return "DT_SUNW_CHECKSUM"; 216 case DT_PLTPADSZ: return "DT_PLTPADSZ"; 217 case DT_MOVEENT: return "DT_MOVEENT"; 218 case DT_MOVESZ: return "DT_MOVESZ"; 219 case DT_FEATURE: return "DT_FEATURE"; 220 case DT_POSFLAG_1: return "DT_POSFLAG_1"; 221 case DT_SYMINSZ: return "DT_SYMINSZ"; 222 case DT_SYMINENT : return "DT_SYMINENT (DT_VALRNGHI)"; 223 case DT_ADDRRNGLO: return "DT_ADDRRNGLO"; 224 case DT_GNU_HASH: return "DT_GNU_HASH"; 225 case 0x6ffffef8: return "DT_GNU_CONFLICT"; 226 case 0x6ffffef9: return "DT_GNU_LIBLIST"; 227 case DT_CONFIG: return "DT_CONFIG"; 228 case DT_DEPAUDIT: return "DT_DEPAUDIT"; 229 case DT_AUDIT: return "DT_AUDIT"; 230 case DT_PLTPAD: return "DT_PLTPAD"; 231 case DT_MOVETAB: return "DT_MOVETAB"; 232 case DT_SYMINFO : return "DT_SYMINFO (DT_ADDRRNGHI)"; 233 case DT_RELACOUNT: return "DT_RELACOUNT"; 234 case DT_RELCOUNT: return "DT_RELCOUNT"; 235 case DT_FLAGS_1: return "DT_FLAGS_1"; 236 case DT_VERDEF: return "DT_VERDEF"; 237 case DT_VERDEFNUM: return "DT_VERDEFNUM"; 238 case DT_VERNEED: return "DT_VERNEED"; 239 case DT_VERNEEDNUM: return "DT_VERNEEDNUM"; 240 case 0x6ffffff0: return "DT_GNU_VERSYM"; 241 /* 0x70000000 - 0x7fffffff processor-specific semantics */ 242 case 0x70000000: return "DT_IA_64_PLT_RESERVE"; 243 case 0x7ffffffd: return "DT_SUNW_AUXILIARY"; 244 case 0x7ffffffe: return "DT_SUNW_USED"; 245 case 0x7fffffff: return "DT_SUNW_FILTER"; 246 } 247 snprintf(unknown_tag, sizeof(unknown_tag), 248 "ERROR: TAG NOT DEFINED -- tag 0x%jx", (uintmax_t)tag); 249 return (unknown_tag); 250} 251 252static const char * 253e_machines(u_int mach) 254{ 255 static char machdesc[64]; 256 257 switch (mach) { 258 case EM_NONE: return "EM_NONE"; 259 case EM_M32: return "EM_M32"; 260 case EM_SPARC: return "EM_SPARC"; 261 case EM_386: return "EM_386"; 262 case EM_68K: return "EM_68K"; 263 case EM_88K: return "EM_88K"; 264 case EM_IAMCU: return "EM_IAMCU"; 265 case EM_860: return "EM_860"; 266 case EM_MIPS: return "EM_MIPS"; 267 case EM_PPC: return "EM_PPC"; 268 case EM_PPC64: return "EM_PPC64"; 269 case EM_ARM: return "EM_ARM"; 270 case EM_ALPHA: return "EM_ALPHA (legacy)"; 271 case EM_SPARCV9:return "EM_SPARCV9"; 272 case EM_IA_64: return "EM_IA_64"; 273 case EM_X86_64: return "EM_X86_64"; 274 case EM_AARCH64:return "EM_AARCH64"; 275 case EM_RISCV: return "EM_RISCV"; 276 } 277 snprintf(machdesc, sizeof(machdesc), 278 "(unknown machine) -- type 0x%x", mach); 279 return (machdesc); 280} 281 282static const char *e_types[] = { 283 "ET_NONE", "ET_REL", "ET_EXEC", "ET_DYN", "ET_CORE" 284}; 285 286static const char *ei_versions[] = { 287 "EV_NONE", "EV_CURRENT" 288}; 289 290static const char *ei_classes[] = { 291 "ELFCLASSNONE", "ELFCLASS32", "ELFCLASS64" 292}; 293 294static const char *ei_data[] = { 295 "ELFDATANONE", "ELFDATA2LSB", "ELFDATA2MSB" 296}; 297 298static const char *ei_abis[256] = { 299 "ELFOSABI_SYSV", "ELFOSABI_HPUX", "ELFOSABI_NETBSD", "ELFOSABI_LINUX", 300 "ELFOSABI_HURD", "ELFOSABI_86OPEN", "ELFOSABI_SOLARIS", "ELFOSABI_AIX", 301 "ELFOSABI_IRIX", "ELFOSABI_FREEBSD", "ELFOSABI_TRU64", 302 "ELFOSABI_MODESTO", "ELFOSABI_OPENBSD", 303 [255] = "ELFOSABI_STANDALONE" 304}; 305 306static const char *p_types[] = { 307 "PT_NULL", "PT_LOAD", "PT_DYNAMIC", "PT_INTERP", "PT_NOTE", 308 "PT_SHLIB", "PT_PHDR", "PT_TLS" 309}; 310 311static const char *p_flags[] = { 312 "", "PF_X", "PF_W", "PF_X|PF_W", "PF_R", "PF_X|PF_R", "PF_W|PF_R", 313 "PF_X|PF_W|PF_R" 314}; 315 316/* http://www.sco.com/developers/gabi/latest/ch4.sheader.html#sh_type */ 317static const char * 318sh_types(uint64_t machine, uint64_t sht) { 319 static char unknown_buf[64]; 320 321 if (sht < 0x60000000) { 322 switch (sht) { 323 case SHT_NULL: return "SHT_NULL"; 324 case SHT_PROGBITS: return "SHT_PROGBITS"; 325 case SHT_SYMTAB: return "SHT_SYMTAB"; 326 case SHT_STRTAB: return "SHT_STRTAB"; 327 case SHT_RELA: return "SHT_RELA"; 328 case SHT_HASH: return "SHT_HASH"; 329 case SHT_DYNAMIC: return "SHT_DYNAMIC"; 330 case SHT_NOTE: return "SHT_NOTE"; 331 case SHT_NOBITS: return "SHT_NOBITS"; 332 case SHT_REL: return "SHT_REL"; 333 case SHT_SHLIB: return "SHT_SHLIB"; 334 case SHT_DYNSYM: return "SHT_DYNSYM"; 335 case SHT_INIT_ARRAY: return "SHT_INIT_ARRAY"; 336 case SHT_FINI_ARRAY: return "SHT_FINI_ARRAY"; 337 case SHT_PREINIT_ARRAY: return "SHT_PREINIT_ARRAY"; 338 case SHT_GROUP: return "SHT_GROUP"; 339 case SHT_SYMTAB_SHNDX: return "SHT_SYMTAB_SHNDX"; 340 } 341 snprintf(unknown_buf, sizeof(unknown_buf), 342 "ERROR: SHT %ju NOT DEFINED", (uintmax_t)sht); 343 return (unknown_buf); 344 } else if (sht < 0x70000000) { 345 /* 0x60000000-0x6fffffff operating system-specific semantics */ 346 switch (sht) { 347 case 0x6ffffff0: return "XXX:VERSYM"; 348 case SHT_SUNW_dof: return "SHT_SUNW_dof"; 349 case SHT_GNU_HASH: return "SHT_GNU_HASH"; 350 case 0x6ffffff7: return "SHT_GNU_LIBLIST"; 351 case 0x6ffffffc: return "XXX:VERDEF"; 352 case SHT_SUNW_verdef: return "SHT_SUNW(GNU)_verdef"; 353 case SHT_SUNW_verneed: return "SHT_SUNW(GNU)_verneed"; 354 case SHT_SUNW_versym: return "SHT_SUNW(GNU)_versym"; 355 } 356 snprintf(unknown_buf, sizeof(unknown_buf), 357 "ERROR: OS-SPECIFIC SHT 0x%jx NOT DEFINED", 358 (uintmax_t)sht); 359 return (unknown_buf); 360 } else if (sht < 0x80000000) { 361 /* 0x70000000-0x7fffffff processor-specific semantics */ 362 switch (machine) { 363 case EM_ARM: 364 switch (sht) { 365 case SHT_ARM_EXIDX: return "SHT_ARM_EXIDX"; 366 case SHT_ARM_PREEMPTMAP:return "SHT_ARM_PREEMPTMAP"; 367 case SHT_ARM_ATTRIBUTES:return "SHT_ARM_ATTRIBUTES"; 368 case SHT_ARM_DEBUGOVERLAY: 369 return "SHT_ARM_DEBUGOVERLAY"; 370 case SHT_ARM_OVERLAYSECTION: 371 return "SHT_ARM_OVERLAYSECTION"; 372 } 373 break; 374 case EM_IA_64: 375 switch (sht) { 376 case 0x70000000: return "SHT_IA_64_EXT"; 377 case 0x70000001: return "SHT_IA_64_UNWIND"; 378 } 379 break; 380 case EM_MIPS: 381 switch (sht) { 382 case SHT_MIPS_OPTIONS: return "SHT_MIPS_OPTIONS"; 383 } 384 break; 385 } 386 switch (sht) { 387 case 0x7ffffffd: return "XXX:AUXILIARY"; 388 case 0x7fffffff: return "XXX:FILTER"; 389 } 390 snprintf(unknown_buf, sizeof(unknown_buf), 391 "ERROR: PROCESSOR-SPECIFIC SHT 0x%jx NOT DEFINED", 392 (uintmax_t)sht); 393 return (unknown_buf); 394 } else { 395 /* 0x80000000-0xffffffff application programs */ 396 snprintf(unknown_buf, sizeof(unknown_buf), 397 "ERROR: SHT 0x%jx NOT DEFINED", 398 (uintmax_t)sht); 399 return (unknown_buf); 400 } 401} 402 403static const char *sh_flags[] = { 404 "", "SHF_WRITE", "SHF_ALLOC", "SHF_WRITE|SHF_ALLOC", "SHF_EXECINSTR", 405 "SHF_WRITE|SHF_EXECINSTR", "SHF_ALLOC|SHF_EXECINSTR", 406 "SHF_WRITE|SHF_ALLOC|SHF_EXECINSTR" 407}; 408 409static const char *st_types[] = { 410 "STT_NOTYPE", "STT_OBJECT", "STT_FUNC", "STT_SECTION", "STT_FILE" 411}; 412 413static const char *st_bindings[] = { 414 "STB_LOCAL", "STB_GLOBAL", "STB_WEAK" 415}; 416 417static char *dynstr; 418static char *shstrtab; 419static char *strtab; 420static FILE *out; 421 422static u_int64_t elf_get_byte(Elf32_Ehdr *e, void *base, elf_member_t member); 423static u_int64_t elf_get_quarter(Elf32_Ehdr *e, void *base, 424 elf_member_t member); 425#if 0 426static u_int64_t elf_get_half(Elf32_Ehdr *e, void *base, elf_member_t member); 427#endif 428static u_int64_t elf_get_word(Elf32_Ehdr *e, void *base, elf_member_t member); 429static u_int64_t elf_get_quad(Elf32_Ehdr *e, void *base, elf_member_t member); 430 431static void elf_print_ehdr(Elf32_Ehdr *e, void *sh); 432static void elf_print_phdr(Elf32_Ehdr *e, void *p); 433static void elf_print_shdr(Elf32_Ehdr *e, void *sh); 434static void elf_print_symtab(Elf32_Ehdr *e, void *sh, char *str); 435static void elf_print_dynamic(Elf32_Ehdr *e, void *sh); 436static void elf_print_rel(Elf32_Ehdr *e, void *r); 437static void elf_print_rela(Elf32_Ehdr *e, void *ra); 438static void elf_print_interp(Elf32_Ehdr *e, void *p); 439static void elf_print_got(Elf32_Ehdr *e, void *sh); 440static void elf_print_hash(Elf32_Ehdr *e, void *sh); 441static void elf_print_note(Elf32_Ehdr *e, void *sh); 442 443static void usage(void); 444 445/* 446 * Helpers for ELF files with shnum or shstrndx values that don't fit in the 447 * ELF header. If the values are too large then an escape value is used to 448 * indicate that the actual value is found in one of section 0's fields. 449 */ 450static uint64_t 451elf_get_shnum(Elf32_Ehdr *e, void *sh) 452{ 453 uint64_t shnum; 454 455 shnum = elf_get_quarter(e, e, E_SHNUM); 456 if (shnum == 0) 457 shnum = elf_get_word(e, (char *)sh, SH_SIZE); 458 return shnum; 459} 460 461static uint64_t 462elf_get_shstrndx(Elf32_Ehdr *e, void *sh) 463{ 464 uint64_t shstrndx; 465 466 shstrndx = elf_get_quarter(e, e, E_SHSTRNDX); 467 if (shstrndx == SHN_XINDEX) 468 shstrndx = elf_get_word(e, (char *)sh, SH_LINK); 469 return shstrndx; 470} 471 472int 473main(int ac, char **av) 474{ 475 cap_rights_t rights; 476 u_int64_t phoff; 477 u_int64_t shoff; 478 u_int64_t phentsize; 479 u_int64_t phnum; 480 u_int64_t shentsize; 481 u_int64_t shnum; 482 u_int64_t shstrndx; 483 u_int64_t offset; 484 u_int64_t name; 485 u_int64_t type; 486 struct stat sb; 487 u_int flags; 488 Elf32_Ehdr *e; 489 void *p; 490 void *sh; 491 void *v; 492 int fd; 493 int ch; 494 int i; 495 496 out = stdout; 497 flags = 0; 498 while ((ch = getopt(ac, av, "acdeiGhnprsw:")) != -1) 499 switch (ch) { 500 case 'a': 501 flags = ED_ALL; 502 break; 503 case 'c': 504 flags |= ED_SHDR; 505 break; 506 case 'd': 507 flags |= ED_DYN; 508 break; 509 case 'e': 510 flags |= ED_EHDR; 511 break; 512 case 'i': 513 flags |= ED_INTERP; 514 break; 515 case 'G': 516 flags |= ED_GOT; 517 break; 518 case 'h': 519 flags |= ED_HASH; 520 break; 521 case 'n': 522 flags |= ED_NOTE; 523 break; 524 case 'p': 525 flags |= ED_PHDR; 526 break; 527 case 'r': 528 flags |= ED_REL; 529 break; 530 case 's': 531 flags |= ED_SYMTAB; 532 break; 533 case 'w': 534 if ((out = fopen(optarg, "w")) == NULL) 535 err(1, "%s", optarg); 536 cap_rights_init(&rights, CAP_FSTAT, CAP_WRITE); 537 if (cap_rights_limit(fileno(out), &rights) < 0 && errno != ENOSYS) 538 err(1, "unable to limit rights for %s", optarg); 539 break; 540 case '?': 541 default: 542 usage(); 543 } 544 ac -= optind; 545 av += optind; 546 if (ac == 0 || flags == 0) 547 usage(); 548 if ((fd = open(*av, O_RDONLY)) < 0 || 549 fstat(fd, &sb) < 0) 550 err(1, "%s", *av); 551 cap_rights_init(&rights, CAP_MMAP_R); 552 if (cap_rights_limit(fd, &rights) < 0 && errno != ENOSYS) 553 err(1, "unable to limit rights for %s", *av); 554 close(STDIN_FILENO); 555 cap_rights_init(&rights, CAP_WRITE); 556 if (cap_rights_limit(STDOUT_FILENO, &rights) < 0 && errno != ENOSYS) 557 err(1, "unable to limit rights for stdout"); 558 if (cap_rights_limit(STDERR_FILENO, &rights) < 0 && errno != ENOSYS) 559 err(1, "unable to limit rights for stderr"); 560 if (cap_enter() < 0 && errno != ENOSYS) 561 err(1, "unable to enter capability mode"); 562 e = mmap(NULL, sb.st_size, PROT_READ, MAP_SHARED, fd, 0); 563 if (e == MAP_FAILED) 564 err(1, NULL); 565 if (!IS_ELF(*(Elf32_Ehdr *)e)) 566 errx(1, "not an elf file"); 567 phoff = elf_get_off(e, e, E_PHOFF); 568 shoff = elf_get_off(e, e, E_SHOFF); 569 phentsize = elf_get_quarter(e, e, E_PHENTSIZE); 570 phnum = elf_get_quarter(e, e, E_PHNUM); 571 shentsize = elf_get_quarter(e, e, E_SHENTSIZE); 572 p = (char *)e + phoff; 573 if (shoff > 0) { 574 sh = (char *)e + shoff; 575 shnum = elf_get_shnum(e, sh); 576 shstrndx = elf_get_shstrndx(e, sh); 577 offset = elf_get_off(e, (char *)sh + shstrndx * shentsize, 578 SH_OFFSET); 579 shstrtab = (char *)e + offset; 580 } else { 581 sh = NULL; 582 shnum = 0; 583 shstrndx = 0; 584 shstrtab = NULL; 585 } 586 for (i = 0; (u_int64_t)i < shnum; i++) { 587 name = elf_get_word(e, (char *)sh + i * shentsize, SH_NAME); 588 offset = elf_get_off(e, (char *)sh + i * shentsize, SH_OFFSET); 589 if (strcmp(shstrtab + name, ".strtab") == 0) 590 strtab = (char *)e + offset; 591 if (strcmp(shstrtab + name, ".dynstr") == 0) 592 dynstr = (char *)e + offset; 593 } 594 if (flags & ED_EHDR) 595 elf_print_ehdr(e, sh); 596 if (flags & ED_PHDR) 597 elf_print_phdr(e, p); 598 if (flags & ED_SHDR) 599 elf_print_shdr(e, sh); 600 for (i = 0; (u_int64_t)i < phnum; i++) { 601 v = (char *)p + i * phentsize; 602 type = elf_get_word(e, v, P_TYPE); 603 switch (type) { 604 case PT_INTERP: 605 if (flags & ED_INTERP) 606 elf_print_interp(e, v); 607 break; 608 case PT_NULL: 609 case PT_LOAD: 610 case PT_DYNAMIC: 611 case PT_NOTE: 612 case PT_SHLIB: 613 case PT_PHDR: 614 break; 615 } 616 } 617 for (i = 0; (u_int64_t)i < shnum; i++) { 618 v = (char *)sh + i * shentsize; 619 type = elf_get_word(e, v, SH_TYPE); 620 switch (type) { 621 case SHT_SYMTAB: 622 if (flags & ED_SYMTAB) 623 elf_print_symtab(e, v, strtab); 624 break; 625 case SHT_DYNAMIC: 626 if (flags & ED_DYN) 627 elf_print_dynamic(e, v); 628 break; 629 case SHT_RELA: 630 if (flags & ED_REL) 631 elf_print_rela(e, v); 632 break; 633 case SHT_REL: 634 if (flags & ED_REL) 635 elf_print_rel(e, v); 636 break; 637 case SHT_NOTE: 638 name = elf_get_word(e, v, SH_NAME); 639 if (flags & ED_NOTE && 640 strcmp(shstrtab + name, ".note.ABI-tag") == 0) 641 elf_print_note(e, v); 642 break; 643 case SHT_DYNSYM: 644 if (flags & ED_SYMTAB) 645 elf_print_symtab(e, v, dynstr); 646 break; 647 case SHT_PROGBITS: 648 name = elf_get_word(e, v, SH_NAME); 649 if (flags & ED_GOT && 650 strcmp(shstrtab + name, ".got") == 0) 651 elf_print_got(e, v); 652 break; 653 case SHT_HASH: 654 if (flags & ED_HASH) 655 elf_print_hash(e, v); 656 break; 657 case SHT_NULL: 658 case SHT_STRTAB: 659 case SHT_NOBITS: 660 case SHT_SHLIB: 661 break; 662 } 663 } 664 665 return 0; 666} 667 668static void 669elf_print_ehdr(Elf32_Ehdr *e, void *sh) 670{ 671 u_int64_t class; 672 u_int64_t data; 673 u_int64_t osabi; 674 u_int64_t type; 675 u_int64_t machine; 676 u_int64_t version; 677 u_int64_t entry; 678 u_int64_t phoff; 679 u_int64_t shoff; 680 u_int64_t flags; 681 u_int64_t ehsize; 682 u_int64_t phentsize; 683 u_int64_t phnum; 684 u_int64_t shentsize; 685 u_int64_t shnum; 686 u_int64_t shstrndx; 687 688 class = elf_get_byte(e, e, E_CLASS); 689 data = elf_get_byte(e, e, E_DATA); 690 osabi = elf_get_byte(e, e, E_OSABI); 691 type = elf_get_quarter(e, e, E_TYPE); 692 machine = elf_get_quarter(e, e, E_MACHINE); 693 version = elf_get_word(e, e, E_VERSION); 694 entry = elf_get_addr(e, e, E_ENTRY); 695 phoff = elf_get_off(e, e, E_PHOFF); 696 shoff = elf_get_off(e, e, E_SHOFF); 697 flags = elf_get_word(e, e, E_FLAGS); 698 ehsize = elf_get_quarter(e, e, E_EHSIZE); 699 phentsize = elf_get_quarter(e, e, E_PHENTSIZE); 700 phnum = elf_get_quarter(e, e, E_PHNUM); 701 shentsize = elf_get_quarter(e, e, E_SHENTSIZE); 702 fprintf(out, "\nelf header:\n"); 703 fprintf(out, "\n"); 704 fprintf(out, "\te_ident: %s %s %s\n", ei_classes[class], ei_data[data], 705 ei_abis[osabi]); 706 fprintf(out, "\te_type: %s\n", e_types[type]); 707 fprintf(out, "\te_machine: %s\n", e_machines(machine)); 708 fprintf(out, "\te_version: %s\n", ei_versions[version]); 709 fprintf(out, "\te_entry: %#jx\n", (intmax_t)entry); 710 fprintf(out, "\te_phoff: %jd\n", (intmax_t)phoff); 711 fprintf(out, "\te_shoff: %jd\n", (intmax_t)shoff); 712 fprintf(out, "\te_flags: %jd\n", (intmax_t)flags); 713 fprintf(out, "\te_ehsize: %jd\n", (intmax_t)ehsize); 714 fprintf(out, "\te_phentsize: %jd\n", (intmax_t)phentsize); 715 fprintf(out, "\te_phnum: %jd\n", (intmax_t)phnum); 716 fprintf(out, "\te_shentsize: %jd\n", (intmax_t)shentsize); 717 if (sh != NULL) { 718 shnum = elf_get_shnum(e, sh); 719 shstrndx = elf_get_shstrndx(e, sh); 720 fprintf(out, "\te_shnum: %jd\n", (intmax_t)shnum); 721 fprintf(out, "\te_shstrndx: %jd\n", (intmax_t)shstrndx); 722 } 723} 724 725static void 726elf_print_phdr(Elf32_Ehdr *e, void *p) 727{ 728 u_int64_t phentsize; 729 u_int64_t phnum; 730 u_int64_t type; 731 u_int64_t offset; 732 u_int64_t vaddr; 733 u_int64_t paddr; 734 u_int64_t filesz; 735 u_int64_t memsz; 736 u_int64_t flags; 737 u_int64_t align; 738 void *v; 739 int i; 740 741 phentsize = elf_get_quarter(e, e, E_PHENTSIZE); 742 phnum = elf_get_quarter(e, e, E_PHNUM); 743 fprintf(out, "\nprogram header:\n"); 744 for (i = 0; (u_int64_t)i < phnum; i++) { 745 v = (char *)p + i * phentsize; 746 type = elf_get_word(e, v, P_TYPE); 747 offset = elf_get_off(e, v, P_OFFSET); 748 vaddr = elf_get_addr(e, v, P_VADDR); 749 paddr = elf_get_addr(e, v, P_PADDR); 750 filesz = elf_get_size(e, v, P_FILESZ); 751 memsz = elf_get_size(e, v, P_MEMSZ); 752 flags = elf_get_word(e, v, P_FLAGS); 753 align = elf_get_size(e, v, P_ALIGN); 754 fprintf(out, "\n"); 755 fprintf(out, "entry: %d\n", i); 756 fprintf(out, "\tp_type: %s\n", p_types[type & 0x7]); 757 fprintf(out, "\tp_offset: %jd\n", (intmax_t)offset); 758 fprintf(out, "\tp_vaddr: %#jx\n", (intmax_t)vaddr); 759 fprintf(out, "\tp_paddr: %#jx\n", (intmax_t)paddr); 760 fprintf(out, "\tp_filesz: %jd\n", (intmax_t)filesz); 761 fprintf(out, "\tp_memsz: %jd\n", (intmax_t)memsz); 762 fprintf(out, "\tp_flags: %s\n", p_flags[flags]); 763 fprintf(out, "\tp_align: %jd\n", (intmax_t)align); 764 } 765} 766 767static void 768elf_print_shdr(Elf32_Ehdr *e, void *sh) 769{ 770 u_int64_t shentsize; 771 u_int64_t shnum; 772 u_int64_t name; 773 u_int64_t type; 774 u_int64_t flags; 775 u_int64_t addr; 776 u_int64_t offset; 777 u_int64_t size; 778 u_int64_t shlink; 779 u_int64_t info; 780 u_int64_t addralign; 781 u_int64_t entsize; 782 u_int64_t machine; 783 void *v; 784 int i; 785 786 if (sh == NULL) { 787 fprintf(out, "\nNo section headers\n"); 788 return; 789 } 790 791 machine = elf_get_quarter(e, e, E_MACHINE); 792 shentsize = elf_get_quarter(e, e, E_SHENTSIZE); 793 shnum = elf_get_shnum(e, sh); 794 fprintf(out, "\nsection header:\n"); 795 for (i = 0; (u_int64_t)i < shnum; i++) { 796 v = (char *)sh + i * shentsize; 797 name = elf_get_word(e, v, SH_NAME); 798 type = elf_get_word(e, v, SH_TYPE); 799 flags = elf_get_word(e, v, SH_FLAGS); 800 addr = elf_get_addr(e, v, SH_ADDR); 801 offset = elf_get_off(e, v, SH_OFFSET); 802 size = elf_get_size(e, v, SH_SIZE); 803 shlink = elf_get_word(e, v, SH_LINK); 804 info = elf_get_word(e, v, SH_INFO); 805 addralign = elf_get_size(e, v, SH_ADDRALIGN); 806 entsize = elf_get_size(e, v, SH_ENTSIZE); 807 fprintf(out, "\n"); 808 fprintf(out, "entry: %d\n", i); 809 fprintf(out, "\tsh_name: %s\n", shstrtab + name); 810 fprintf(out, "\tsh_type: %s\n", sh_types(machine, type)); 811 fprintf(out, "\tsh_flags: %s\n", sh_flags[flags & 0x7]); 812 fprintf(out, "\tsh_addr: %#jx\n", addr); 813 fprintf(out, "\tsh_offset: %jd\n", (intmax_t)offset); 814 fprintf(out, "\tsh_size: %jd\n", (intmax_t)size); 815 fprintf(out, "\tsh_link: %jd\n", (intmax_t)shlink); 816 fprintf(out, "\tsh_info: %jd\n", (intmax_t)info); 817 fprintf(out, "\tsh_addralign: %jd\n", (intmax_t)addralign); 818 fprintf(out, "\tsh_entsize: %jd\n", (intmax_t)entsize); 819 } 820} 821 822static void 823elf_print_symtab(Elf32_Ehdr *e, void *sh, char *str) 824{ 825 u_int64_t offset; 826 u_int64_t entsize; 827 u_int64_t size; 828 u_int64_t name; 829 u_int64_t value; 830 u_int64_t info; 831 u_int64_t shndx; 832 void *st; 833 int len; 834 int i; 835 836 offset = elf_get_off(e, sh, SH_OFFSET); 837 entsize = elf_get_size(e, sh, SH_ENTSIZE); 838 size = elf_get_size(e, sh, SH_SIZE); 839 name = elf_get_word(e, sh, SH_NAME); 840 len = size / entsize; 841 fprintf(out, "\nsymbol table (%s):\n", shstrtab + name); 842 for (i = 0; i < len; i++) { 843 st = (char *)e + offset + i * entsize; 844 name = elf_get_word(e, st, ST_NAME); 845 value = elf_get_addr(e, st, ST_VALUE); 846 size = elf_get_size(e, st, ST_SIZE); 847 info = elf_get_byte(e, st, ST_INFO); 848 shndx = elf_get_quarter(e, st, ST_SHNDX); 849 fprintf(out, "\n"); 850 fprintf(out, "entry: %d\n", i); 851 fprintf(out, "\tst_name: %s\n", str + name); 852 fprintf(out, "\tst_value: %#jx\n", value); 853 fprintf(out, "\tst_size: %jd\n", (intmax_t)size); 854 fprintf(out, "\tst_info: %s %s\n", 855 st_types[ELF32_ST_TYPE(info)], 856 st_bindings[ELF32_ST_BIND(info)]); 857 fprintf(out, "\tst_shndx: %jd\n", (intmax_t)shndx); 858 } 859} 860 861static void 862elf_print_dynamic(Elf32_Ehdr *e, void *sh) 863{ 864 u_int64_t offset; 865 u_int64_t entsize; 866 u_int64_t size; 867 int64_t tag; 868 u_int64_t ptr; 869 u_int64_t val; 870 void *d; 871 int i; 872 873 offset = elf_get_off(e, sh, SH_OFFSET); 874 entsize = elf_get_size(e, sh, SH_ENTSIZE); 875 size = elf_get_size(e, sh, SH_SIZE); 876 fprintf(out, "\ndynamic:\n"); 877 for (i = 0; (u_int64_t)i < size / entsize; i++) { 878 d = (char *)e + offset + i * entsize; 879 tag = elf_get_size(e, d, D_TAG); 880 ptr = elf_get_size(e, d, D_PTR); 881 val = elf_get_addr(e, d, D_VAL); 882 fprintf(out, "\n"); 883 fprintf(out, "entry: %d\n", i); 884 fprintf(out, "\td_tag: %s\n", d_tags(tag)); 885 switch (tag) { 886 case DT_NEEDED: 887 case DT_SONAME: 888 case DT_RPATH: 889 fprintf(out, "\td_val: %s\n", dynstr + val); 890 break; 891 case DT_PLTRELSZ: 892 case DT_RELA: 893 case DT_RELASZ: 894 case DT_RELAENT: 895 case DT_STRSZ: 896 case DT_SYMENT: 897 case DT_RELSZ: 898 case DT_RELENT: 899 case DT_PLTREL: 900 fprintf(out, "\td_val: %jd\n", (intmax_t)val); 901 break; 902 case DT_PLTGOT: 903 case DT_HASH: 904 case DT_STRTAB: 905 case DT_SYMTAB: 906 case DT_INIT: 907 case DT_FINI: 908 case DT_REL: 909 case DT_JMPREL: 910 fprintf(out, "\td_ptr: %#jx\n", ptr); 911 break; 912 case DT_NULL: 913 case DT_SYMBOLIC: 914 case DT_DEBUG: 915 case DT_TEXTREL: 916 break; 917 } 918 } 919} 920 921static void 922elf_print_rela(Elf32_Ehdr *e, void *sh) 923{ 924 u_int64_t offset; 925 u_int64_t entsize; 926 u_int64_t size; 927 u_int64_t name; 928 u_int64_t info; 929 int64_t addend; 930 void *ra; 931 void *v; 932 int i; 933 934 offset = elf_get_off(e, sh, SH_OFFSET); 935 entsize = elf_get_size(e, sh, SH_ENTSIZE); 936 size = elf_get_size(e, sh, SH_SIZE); 937 name = elf_get_word(e, sh, SH_NAME); 938 v = (char *)e + offset; 939 fprintf(out, "\nrelocation with addend (%s):\n", shstrtab + name); 940 for (i = 0; (u_int64_t)i < size / entsize; i++) { 941 ra = (char *)v + i * entsize; 942 offset = elf_get_addr(e, ra, RA_OFFSET); 943 info = elf_get_word(e, ra, RA_INFO); 944 addend = elf_get_off(e, ra, RA_ADDEND); 945 fprintf(out, "\n"); 946 fprintf(out, "entry: %d\n", i); 947 fprintf(out, "\tr_offset: %#jx\n", offset); 948 fprintf(out, "\tr_info: %jd\n", (intmax_t)info); 949 fprintf(out, "\tr_addend: %jd\n", (intmax_t)addend); 950 } 951} 952 953static void 954elf_print_rel(Elf32_Ehdr *e, void *sh) 955{ 956 u_int64_t offset; 957 u_int64_t entsize; 958 u_int64_t size; 959 u_int64_t name; 960 u_int64_t info; 961 void *r; 962 void *v; 963 int i; 964 965 offset = elf_get_off(e, sh, SH_OFFSET); 966 entsize = elf_get_size(e, sh, SH_ENTSIZE); 967 size = elf_get_size(e, sh, SH_SIZE); 968 name = elf_get_word(e, sh, SH_NAME); 969 v = (char *)e + offset; 970 fprintf(out, "\nrelocation (%s):\n", shstrtab + name); 971 for (i = 0; (u_int64_t)i < size / entsize; i++) { 972 r = (char *)v + i * entsize; 973 offset = elf_get_addr(e, r, R_OFFSET); 974 info = elf_get_word(e, r, R_INFO); 975 fprintf(out, "\n"); 976 fprintf(out, "entry: %d\n", i); 977 fprintf(out, "\tr_offset: %#jx\n", offset); 978 fprintf(out, "\tr_info: %jd\n", (intmax_t)info); 979 } 980} 981 982static void 983elf_print_interp(Elf32_Ehdr *e, void *p) 984{ 985 u_int64_t offset; 986 char *s; 987 988 offset = elf_get_off(e, p, P_OFFSET); 989 s = (char *)e + offset; 990 fprintf(out, "\ninterp:\n"); 991 fprintf(out, "\t%s\n", s); 992} 993 994static void 995elf_print_got(Elf32_Ehdr *e, void *sh) 996{ 997 u_int64_t offset; 998 u_int64_t addralign; 999 u_int64_t size; 1000 u_int64_t addr; 1001 void *v; 1002 int i; 1003 1004 offset = elf_get_off(e, sh, SH_OFFSET); 1005 addralign = elf_get_size(e, sh, SH_ADDRALIGN); 1006 size = elf_get_size(e, sh, SH_SIZE); 1007 v = (char *)e + offset; 1008 fprintf(out, "\nglobal offset table:\n"); 1009 for (i = 0; (u_int64_t)i < size / addralign; i++) { 1010 addr = elf_get_addr(e, (char *)v + i * addralign, 0); 1011 fprintf(out, "\n"); 1012 fprintf(out, "entry: %d\n", i); 1013 fprintf(out, "\t%#jx\n", addr); 1014 } 1015} 1016 1017static void 1018elf_print_hash(Elf32_Ehdr *e __unused, void *sh __unused) 1019{ 1020} 1021 1022static void 1023elf_print_note(Elf32_Ehdr *e, void *sh) 1024{ 1025 u_int64_t offset; 1026 u_int64_t size; 1027 u_int64_t name; 1028 u_int32_t namesz; 1029 u_int32_t descsz; 1030 u_int32_t desc; 1031 char *n, *s; 1032 1033 offset = elf_get_off(e, sh, SH_OFFSET); 1034 size = elf_get_size(e, sh, SH_SIZE); 1035 name = elf_get_word(e, sh, SH_NAME); 1036 n = (char *)e + offset; 1037 fprintf(out, "\nnote (%s):\n", shstrtab + name); 1038 while (n < ((char *)e + offset + size)) { 1039 namesz = elf_get_word(e, n, N_NAMESZ); 1040 descsz = elf_get_word(e, n, N_DESCSZ); 1041 s = n + sizeof(Elf_Note); 1042 desc = elf_get_word(e, n + sizeof(Elf_Note) + namesz, 0); 1043 fprintf(out, "\t%s %d\n", s, desc); 1044 n += sizeof(Elf_Note) + namesz + descsz; 1045 } 1046} 1047 1048static u_int64_t 1049elf_get_byte(Elf32_Ehdr *e, void *base, elf_member_t member) 1050{ 1051 u_int64_t val; 1052 1053 val = 0; 1054 switch (e->e_ident[EI_CLASS]) { 1055 case ELFCLASS32: 1056 val = ((uint8_t *)base)[elf32_offsets[member]]; 1057 break; 1058 case ELFCLASS64: 1059 val = ((uint8_t *)base)[elf64_offsets[member]]; 1060 break; 1061 case ELFCLASSNONE: 1062 errx(1, "invalid class"); 1063 } 1064 1065 return val; 1066} 1067 1068static u_int64_t 1069elf_get_quarter(Elf32_Ehdr *e, void *base, elf_member_t member) 1070{ 1071 u_int64_t val; 1072 1073 val = 0; 1074 switch (e->e_ident[EI_CLASS]) { 1075 case ELFCLASS32: 1076 base = (char *)base + elf32_offsets[member]; 1077 switch (e->e_ident[EI_DATA]) { 1078 case ELFDATA2MSB: 1079 val = be16dec(base); 1080 break; 1081 case ELFDATA2LSB: 1082 val = le16dec(base); 1083 break; 1084 case ELFDATANONE: 1085 errx(1, "invalid data format"); 1086 } 1087 break; 1088 case ELFCLASS64: 1089 base = (char *)base + elf64_offsets[member]; 1090 switch (e->e_ident[EI_DATA]) { 1091 case ELFDATA2MSB: 1092 val = be16dec(base); 1093 break; 1094 case ELFDATA2LSB: 1095 val = le16dec(base); 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 1108#if 0 1109static u_int64_t 1110elf_get_half(Elf32_Ehdr *e, void *base, elf_member_t member) 1111{ 1112 u_int64_t val; 1113 1114 val = 0; 1115 switch (e->e_ident[EI_CLASS]) { 1116 case ELFCLASS32: 1117 base = (char *)base + elf32_offsets[member]; 1118 switch (e->e_ident[EI_DATA]) { 1119 case ELFDATA2MSB: 1120 val = be16dec(base); 1121 break; 1122 case ELFDATA2LSB: 1123 val = le16dec(base); 1124 break; 1125 case ELFDATANONE: 1126 errx(1, "invalid data format"); 1127 } 1128 break; 1129 case ELFCLASS64: 1130 base = (char *)base + elf64_offsets[member]; 1131 switch (e->e_ident[EI_DATA]) { 1132 case ELFDATA2MSB: 1133 val = be32dec(base); 1134 break; 1135 case ELFDATA2LSB: 1136 val = le32dec(base); 1137 break; 1138 case ELFDATANONE: 1139 errx(1, "invalid data format"); 1140 } 1141 break; 1142 case ELFCLASSNONE: 1143 errx(1, "invalid class"); 1144 } 1145 1146 return val; 1147} 1148#endif 1149 1150static u_int64_t 1151elf_get_word(Elf32_Ehdr *e, void *base, elf_member_t member) 1152{ 1153 u_int64_t val; 1154 1155 val = 0; 1156 switch (e->e_ident[EI_CLASS]) { 1157 case ELFCLASS32: 1158 base = (char *)base + elf32_offsets[member]; 1159 switch (e->e_ident[EI_DATA]) { 1160 case ELFDATA2MSB: 1161 val = be32dec(base); 1162 break; 1163 case ELFDATA2LSB: 1164 val = le32dec(base); 1165 break; 1166 case ELFDATANONE: 1167 errx(1, "invalid data format"); 1168 } 1169 break; 1170 case ELFCLASS64: 1171 base = (char *)base + elf64_offsets[member]; 1172 switch (e->e_ident[EI_DATA]) { 1173 case ELFDATA2MSB: 1174 val = be32dec(base); 1175 break; 1176 case ELFDATA2LSB: 1177 val = le32dec(base); 1178 break; 1179 case ELFDATANONE: 1180 errx(1, "invalid data format"); 1181 } 1182 break; 1183 case ELFCLASSNONE: 1184 errx(1, "invalid class"); 1185 } 1186 1187 return val; 1188} 1189 1190static u_int64_t 1191elf_get_quad(Elf32_Ehdr *e, void *base, elf_member_t member) 1192{ 1193 u_int64_t val; 1194 1195 val = 0; 1196 switch (e->e_ident[EI_CLASS]) { 1197 case ELFCLASS32: 1198 base = (char *)base + elf32_offsets[member]; 1199 switch (e->e_ident[EI_DATA]) { 1200 case ELFDATA2MSB: 1201 val = be32dec(base); 1202 break; 1203 case ELFDATA2LSB: 1204 val = le32dec(base); 1205 break; 1206 case ELFDATANONE: 1207 errx(1, "invalid data format"); 1208 } 1209 break; 1210 case ELFCLASS64: 1211 base = (char *)base + elf64_offsets[member]; 1212 switch (e->e_ident[EI_DATA]) { 1213 case ELFDATA2MSB: 1214 val = be64dec(base); 1215 break; 1216 case ELFDATA2LSB: 1217 val = le64dec(base); 1218 break; 1219 case ELFDATANONE: 1220 errx(1, "invalid data format"); 1221 } 1222 break; 1223 case ELFCLASSNONE: 1224 errx(1, "invalid class"); 1225 } 1226 1227 return val; 1228} 1229 1230static void 1231usage(void) 1232{ 1233 fprintf(stderr, "usage: elfdump -a | -cdeGhinprs [-w file] file\n"); 1234 exit(1); 1235} 1236