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("$FreeBSD$"); 30 31 #include <sys/types.h> 32 33 #include <sys/capsicum.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 65 enum 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 87 typedef enum elf_member elf_member_t; 88 89 static 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 }; 129 130 static 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 */ 172 static const char * 173 d_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 } 251 252 static const char * 253 e_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 } 276 snprintf(machdesc, sizeof(machdesc), 277 "(unknown machine) -- type 0x%x", mach); 278 return (machdesc); 279 } 280 281 static const char *e_types[] = { 282 "ET_NONE", "ET_REL", "ET_EXEC", "ET_DYN", "ET_CORE" 283 }; 284 285 static const char *ei_versions[] = { 286 "EV_NONE", "EV_CURRENT" 287 }; 288 289 static const char *ei_classes[] = { 290 "ELFCLASSNONE", "ELFCLASS32", "ELFCLASS64" 291 }; 292 293 static const char *ei_data[] = { 294 "ELFDATANONE", "ELFDATA2LSB", "ELFDATA2MSB" 295 }; 296 297 static const char *ei_abis[256] = { 298 "ELFOSABI_SYSV", "ELFOSABI_HPUX", "ELFOSABI_NETBSD", "ELFOSABI_LINUX", 299 "ELFOSABI_HURD", "ELFOSABI_86OPEN", "ELFOSABI_SOLARIS", "ELFOSABI_AIX", 300 "ELFOSABI_IRIX", "ELFOSABI_FREEBSD", "ELFOSABI_TRU64", 301 "ELFOSABI_MODESTO", "ELFOSABI_OPENBSD", 302 [255] = "ELFOSABI_STANDALONE" 303 }; 304 305 static const char *p_types[] = { 306 "PT_NULL", "PT_LOAD", "PT_DYNAMIC", "PT_INTERP", "PT_NOTE", 307 "PT_SHLIB", "PT_PHDR", "PT_TLS" 308 }; 309 310 static const char *p_flags[] = { 311 "", "PF_X", "PF_W", "PF_X|PF_W", "PF_R", "PF_X|PF_R", "PF_W|PF_R", 312 "PF_X|PF_W|PF_R" 313 }; 314 315 /* http://www.sco.com/developers/gabi/latest/ch4.sheader.html#sh_type */ 316 static const char * 317 sh_types(uint64_t machine, uint64_t sht) { 318 static char unknown_buf[64]; 319 320 if (sht < 0x60000000) { 321 switch (sht) { 322 case SHT_NULL: return "SHT_NULL"; 323 case SHT_PROGBITS: return "SHT_PROGBITS"; 324 case SHT_SYMTAB: return "SHT_SYMTAB"; 325 case SHT_STRTAB: return "SHT_STRTAB"; 326 case SHT_RELA: return "SHT_RELA"; 327 case SHT_HASH: return "SHT_HASH"; 328 case SHT_DYNAMIC: return "SHT_DYNAMIC"; 329 case SHT_NOTE: return "SHT_NOTE"; 330 case SHT_NOBITS: return "SHT_NOBITS"; 331 case SHT_REL: return "SHT_REL"; 332 case SHT_SHLIB: return "SHT_SHLIB"; 333 case SHT_DYNSYM: return "SHT_DYNSYM"; 334 case SHT_INIT_ARRAY: return "SHT_INIT_ARRAY"; 335 case SHT_FINI_ARRAY: return "SHT_FINI_ARRAY"; 336 case SHT_PREINIT_ARRAY: return "SHT_PREINIT_ARRAY"; 337 case SHT_GROUP: return "SHT_GROUP"; 338 case SHT_SYMTAB_SHNDX: return "SHT_SYMTAB_SHNDX"; 339 } 340 snprintf(unknown_buf, sizeof(unknown_buf), 341 "ERROR: SHT %ju NOT DEFINED", (uintmax_t)sht); 342 return (unknown_buf); 343 } else if (sht < 0x70000000) { 344 /* 0x60000000-0x6fffffff operating system-specific semantics */ 345 switch (sht) { 346 case 0x6ffffff0: return "XXX:VERSYM"; 347 case SHT_SUNW_dof: return "SHT_SUNW_dof"; 348 case SHT_GNU_HASH: return "SHT_GNU_HASH"; 349 case 0x6ffffff7: return "SHT_GNU_LIBLIST"; 350 case 0x6ffffffc: return "XXX:VERDEF"; 351 case SHT_SUNW_verdef: return "SHT_SUNW(GNU)_verdef"; 352 case SHT_SUNW_verneed: return "SHT_SUNW(GNU)_verneed"; 353 case SHT_SUNW_versym: return "SHT_SUNW(GNU)_versym"; 354 } 355 snprintf(unknown_buf, sizeof(unknown_buf), 356 "ERROR: OS-SPECIFIC SHT 0x%jx NOT DEFINED", 357 (uintmax_t)sht); 358 return (unknown_buf); 359 } else if (sht < 0x80000000) { 360 /* 0x70000000-0x7fffffff processor-specific semantics */ 361 switch (machine) { 362 case EM_ARM: 363 switch (sht) { 364 case SHT_ARM_EXIDX: return "SHT_ARM_EXIDX"; 365 case SHT_ARM_PREEMPTMAP:return "SHT_ARM_PREEMPTMAP"; 366 case SHT_ARM_ATTRIBUTES:return "SHT_ARM_ATTRIBUTES"; 367 case SHT_ARM_DEBUGOVERLAY: 368 return "SHT_ARM_DEBUGOVERLAY"; 369 case SHT_ARM_OVERLAYSECTION: 370 return "SHT_ARM_OVERLAYSECTION"; 371 } 372 break; 373 case EM_IA_64: 374 switch (sht) { 375 case 0x70000000: return "SHT_IA_64_EXT"; 376 case 0x70000001: return "SHT_IA_64_UNWIND"; 377 } 378 break; 379 case EM_MIPS: 380 switch (sht) { 381 case SHT_MIPS_OPTIONS: return "SHT_MIPS_OPTIONS"; 382 } 383 break; 384 } 385 switch (sht) { 386 case 0x7ffffffd: return "XXX:AUXILIARY"; 387 case 0x7fffffff: return "XXX:FILTER"; 388 } 389 snprintf(unknown_buf, sizeof(unknown_buf), 390 "ERROR: PROCESSOR-SPECIFIC SHT 0x%jx NOT DEFINED", 391 (uintmax_t)sht); 392 return (unknown_buf); 393 } else { 394 /* 0x80000000-0xffffffff application programs */ 395 snprintf(unknown_buf, sizeof(unknown_buf), 396 "ERROR: SHT 0x%jx NOT DEFINED", 397 (uintmax_t)sht); 398 return (unknown_buf); 399 } 400 } 401 402 static const char *sh_flags[] = { 403 "", "SHF_WRITE", "SHF_ALLOC", "SHF_WRITE|SHF_ALLOC", "SHF_EXECINSTR", 404 "SHF_WRITE|SHF_EXECINSTR", "SHF_ALLOC|SHF_EXECINSTR", 405 "SHF_WRITE|SHF_ALLOC|SHF_EXECINSTR" 406 }; 407 408 static const char *st_types[] = { 409 "STT_NOTYPE", "STT_OBJECT", "STT_FUNC", "STT_SECTION", "STT_FILE" 410 }; 411 412 static const char *st_bindings[] = { 413 "STB_LOCAL", "STB_GLOBAL", "STB_WEAK" 414 }; 415 416 static char *dynstr; 417 static char *shstrtab; 418 static char *strtab; 419 static FILE *out; 420 421 static u_int64_t elf_get_byte(Elf32_Ehdr *e, void *base, elf_member_t member); 422 static u_int64_t elf_get_quarter(Elf32_Ehdr *e, void *base, 423 elf_member_t member); 424 #if 0 425 static u_int64_t elf_get_half(Elf32_Ehdr *e, void *base, elf_member_t member); 426 #endif 427 static u_int64_t elf_get_word(Elf32_Ehdr *e, void *base, elf_member_t member); 428 static u_int64_t elf_get_quad(Elf32_Ehdr *e, void *base, elf_member_t member); 429 430 static void elf_print_ehdr(Elf32_Ehdr *e, void *sh); 431 static void elf_print_phdr(Elf32_Ehdr *e, void *p); 432 static void elf_print_shdr(Elf32_Ehdr *e, void *sh); 433 static void elf_print_symtab(Elf32_Ehdr *e, void *sh, char *str); 434 static void elf_print_dynamic(Elf32_Ehdr *e, void *sh); 435 static void elf_print_rel(Elf32_Ehdr *e, void *r); 436 static void elf_print_rela(Elf32_Ehdr *e, void *ra); 437 static void elf_print_interp(Elf32_Ehdr *e, void *p); 438 static void elf_print_got(Elf32_Ehdr *e, void *sh); 439 static void elf_print_hash(Elf32_Ehdr *e, void *sh); 440 static void elf_print_note(Elf32_Ehdr *e, void *sh); 441 442 static void usage(void); 443 444 /* 445 * Helpers for ELF files with shnum or shstrndx values that don't fit in the 446 * ELF header. If the values are too large then an escape value is used to 447 * indicate that the actual value is found in one of section 0's fields. 448 */ 449 static uint64_t 450 elf_get_shnum(Elf32_Ehdr *e, void *sh) 451 { 452 uint64_t shnum; 453 454 shnum = elf_get_quarter(e, e, E_SHNUM); 455 if (shnum == 0) 456 shnum = elf_get_word(e, (char *)sh, SH_SIZE); 457 return shnum; 458 } 459 460 static uint64_t 461 elf_get_shstrndx(Elf32_Ehdr *e, void *sh) 462 { 463 uint64_t shstrndx; 464 465 shstrndx = elf_get_quarter(e, e, E_SHSTRNDX); 466 if (shstrndx == SHN_XINDEX) 467 shstrndx = elf_get_word(e, (char *)sh, SH_LINK); 468 return shstrndx; 469 } 470 471 int 472 main(int ac, char **av) 473 { 474 cap_rights_t rights; 475 u_int64_t phoff; 476 u_int64_t shoff; 477 u_int64_t phentsize; 478 u_int64_t phnum; 479 u_int64_t shentsize; 480 u_int64_t shnum; 481 u_int64_t shstrndx; 482 u_int64_t offset; 483 u_int64_t name; 484 u_int64_t type; 485 struct stat sb; 486 u_int flags; 487 Elf32_Ehdr *e; 488 void *p; 489 void *sh; 490 void *v; 491 int fd; 492 int ch; 493 int i; 494 495 out = stdout; 496 flags = 0; 497 while ((ch = getopt(ac, av, "acdeiGhnprsw:")) != -1) 498 switch (ch) { 499 case 'a': 500 flags = ED_ALL; 501 break; 502 case 'c': 503 flags |= ED_SHDR; 504 break; 505 case 'd': 506 flags |= ED_DYN; 507 break; 508 case 'e': 509 flags |= ED_EHDR; 510 break; 511 case 'i': 512 flags |= ED_INTERP; 513 break; 514 case 'G': 515 flags |= ED_GOT; 516 break; 517 case 'h': 518 flags |= ED_HASH; 519 break; 520 case 'n': 521 flags |= ED_NOTE; 522 break; 523 case 'p': 524 flags |= ED_PHDR; 525 break; 526 case 'r': 527 flags |= ED_REL; 528 break; 529 case 's': 530 flags |= ED_SYMTAB; 531 break; 532 case 'w': 533 if ((out = fopen(optarg, "w")) == NULL) 534 err(1, "%s", optarg); 535 cap_rights_init(&rights, CAP_FSTAT, CAP_WRITE); 536 if (cap_rights_limit(fileno(out), &rights) < 0 && errno != ENOSYS) 537 err(1, "unable to limit rights for %s", optarg); 538 break; 539 case '?': 540 default: 541 usage(); 542 } 543 ac -= optind; 544 av += optind; 545 if (ac == 0 || flags == 0) 546 usage(); 547 if ((fd = open(*av, O_RDONLY)) < 0 || 548 fstat(fd, &sb) < 0) 549 err(1, "%s", *av); 550 cap_rights_init(&rights, CAP_MMAP_R); 551 if (cap_rights_limit(fd, &rights) < 0 && errno != ENOSYS) 552 err(1, "unable to limit rights for %s", *av); 553 close(STDIN_FILENO); 554 cap_rights_init(&rights, CAP_WRITE); 555 if (cap_rights_limit(STDOUT_FILENO, &rights) < 0 && errno != ENOSYS) 556 err(1, "unable to limit rights for stdout"); 557 if (cap_rights_limit(STDERR_FILENO, &rights) < 0 && errno != ENOSYS) 558 err(1, "unable to limit rights for stderr"); 559 if (cap_enter() < 0 && errno != ENOSYS) 560 err(1, "unable to enter capability mode"); 561 e = mmap(NULL, sb.st_size, PROT_READ, MAP_SHARED, fd, 0); 562 if (e == MAP_FAILED) 563 err(1, NULL); 564 if (!IS_ELF(*(Elf32_Ehdr *)e)) 565 errx(1, "not an elf file"); 566 phoff = elf_get_off(e, e, E_PHOFF); 567 shoff = elf_get_off(e, e, E_SHOFF); 568 phentsize = elf_get_quarter(e, e, E_PHENTSIZE); 569 phnum = elf_get_quarter(e, e, E_PHNUM); 570 shentsize = elf_get_quarter(e, e, E_SHENTSIZE); 571 p = (char *)e + phoff; 572 if (shoff > 0) { 573 sh = (char *)e + shoff; 574 shnum = elf_get_shnum(e, sh); 575 shstrndx = elf_get_shstrndx(e, sh); 576 offset = elf_get_off(e, (char *)sh + shstrndx * shentsize, 577 SH_OFFSET); 578 shstrtab = (char *)e + offset; 579 } else { 580 sh = NULL; 581 shnum = 0; 582 shstrndx = 0; 583 shstrtab = NULL; 584 } 585 for (i = 0; (u_int64_t)i < shnum; i++) { 586 name = elf_get_word(e, (char *)sh + i * shentsize, SH_NAME); 587 offset = elf_get_off(e, (char *)sh + i * shentsize, SH_OFFSET); 588 if (strcmp(shstrtab + name, ".strtab") == 0) 589 strtab = (char *)e + offset; 590 if (strcmp(shstrtab + name, ".dynstr") == 0) 591 dynstr = (char *)e + offset; 592 } 593 if (flags & ED_EHDR) 594 elf_print_ehdr(e, sh); 595 if (flags & ED_PHDR) 596 elf_print_phdr(e, p); 597 if (flags & ED_SHDR) 598 elf_print_shdr(e, sh); 599 for (i = 0; (u_int64_t)i < phnum; i++) { 600 v = (char *)p + i * phentsize; 601 type = elf_get_word(e, v, P_TYPE); 602 switch (type) { 603 case PT_INTERP: 604 if (flags & ED_INTERP) 605 elf_print_interp(e, v); 606 break; 607 case PT_NULL: 608 case PT_LOAD: 609 case PT_DYNAMIC: 610 case PT_NOTE: 611 case PT_SHLIB: 612 case PT_PHDR: 613 break; 614 } 615 } 616 for (i = 0; (u_int64_t)i < shnum; i++) { 617 v = (char *)sh + i * shentsize; 618 type = elf_get_word(e, v, SH_TYPE); 619 switch (type) { 620 case SHT_SYMTAB: 621 if (flags & ED_SYMTAB) 622 elf_print_symtab(e, v, strtab); 623 break; 624 case SHT_DYNAMIC: 625 if (flags & ED_DYN) 626 elf_print_dynamic(e, v); 627 break; 628 case SHT_RELA: 629 if (flags & ED_REL) 630 elf_print_rela(e, v); 631 break; 632 case SHT_REL: 633 if (flags & ED_REL) 634 elf_print_rel(e, v); 635 break; 636 case SHT_NOTE: 637 name = elf_get_word(e, v, SH_NAME); 638 if (flags & ED_NOTE && 639 strcmp(shstrtab + name, ".note.ABI-tag") == 0) 640 elf_print_note(e, v); 641 break; 642 case SHT_DYNSYM: 643 if (flags & ED_SYMTAB) 644 elf_print_symtab(e, v, dynstr); 645 break; 646 case SHT_PROGBITS: 647 name = elf_get_word(e, v, SH_NAME); 648 if (flags & ED_GOT && 649 strcmp(shstrtab + name, ".got") == 0) 650 elf_print_got(e, v); 651 break; 652 case SHT_HASH: 653 if (flags & ED_HASH) 654 elf_print_hash(e, v); 655 break; 656 case SHT_NULL: 657 case SHT_STRTAB: 658 case SHT_NOBITS: 659 case SHT_SHLIB: 660 break; 661 } 662 } 663 664 return 0; 665 } 666 667 static void 668 elf_print_ehdr(Elf32_Ehdr *e, void *sh) 669 { 670 u_int64_t class; 671 u_int64_t data; 672 u_int64_t osabi; 673 u_int64_t type; 674 u_int64_t machine; 675 u_int64_t version; 676 u_int64_t entry; 677 u_int64_t phoff; 678 u_int64_t shoff; 679 u_int64_t flags; 680 u_int64_t ehsize; 681 u_int64_t phentsize; 682 u_int64_t phnum; 683 u_int64_t shentsize; 684 u_int64_t shnum; 685 u_int64_t shstrndx; 686 687 class = elf_get_byte(e, e, E_CLASS); 688 data = elf_get_byte(e, e, E_DATA); 689 osabi = elf_get_byte(e, e, E_OSABI); 690 type = elf_get_quarter(e, e, E_TYPE); 691 machine = elf_get_quarter(e, e, E_MACHINE); 692 version = elf_get_word(e, e, E_VERSION); 693 entry = elf_get_addr(e, e, E_ENTRY); 694 phoff = elf_get_off(e, e, E_PHOFF); 695 shoff = elf_get_off(e, e, E_SHOFF); 696 flags = elf_get_word(e, e, E_FLAGS); 697 ehsize = elf_get_quarter(e, e, E_EHSIZE); 698 phentsize = elf_get_quarter(e, e, E_PHENTSIZE); 699 phnum = elf_get_quarter(e, e, E_PHNUM); 700 shentsize = elf_get_quarter(e, e, E_SHENTSIZE); 701 fprintf(out, "\nelf header:\n"); 702 fprintf(out, "\n"); 703 fprintf(out, "\te_ident: %s %s %s\n", ei_classes[class], ei_data[data], 704 ei_abis[osabi]); 705 fprintf(out, "\te_type: %s\n", e_types[type]); 706 fprintf(out, "\te_machine: %s\n", e_machines(machine)); 707 fprintf(out, "\te_version: %s\n", ei_versions[version]); 708 fprintf(out, "\te_entry: %#jx\n", (intmax_t)entry); 709 fprintf(out, "\te_phoff: %jd\n", (intmax_t)phoff); 710 fprintf(out, "\te_shoff: %jd\n", (intmax_t)shoff); 711 fprintf(out, "\te_flags: %jd\n", (intmax_t)flags); 712 fprintf(out, "\te_ehsize: %jd\n", (intmax_t)ehsize); 713 fprintf(out, "\te_phentsize: %jd\n", (intmax_t)phentsize); 714 fprintf(out, "\te_phnum: %jd\n", (intmax_t)phnum); 715 fprintf(out, "\te_shentsize: %jd\n", (intmax_t)shentsize); 716 if (sh != NULL) { 717 shnum = elf_get_shnum(e, sh); 718 shstrndx = elf_get_shstrndx(e, sh); 719 fprintf(out, "\te_shnum: %jd\n", (intmax_t)shnum); 720 fprintf(out, "\te_shstrndx: %jd\n", (intmax_t)shstrndx); 721 } 722 } 723 724 static void 725 elf_print_phdr(Elf32_Ehdr *e, void *p) 726 { 727 u_int64_t phentsize; 728 u_int64_t phnum; 729 u_int64_t type; 730 u_int64_t offset; 731 u_int64_t vaddr; 732 u_int64_t paddr; 733 u_int64_t filesz; 734 u_int64_t memsz; 735 u_int64_t flags; 736 u_int64_t align; 737 void *v; 738 int i; 739 740 phentsize = elf_get_quarter(e, e, E_PHENTSIZE); 741 phnum = elf_get_quarter(e, e, E_PHNUM); 742 fprintf(out, "\nprogram header:\n"); 743 for (i = 0; (u_int64_t)i < phnum; i++) { 744 v = (char *)p + i * phentsize; 745 type = elf_get_word(e, v, P_TYPE); 746 offset = elf_get_off(e, v, P_OFFSET); 747 vaddr = elf_get_addr(e, v, P_VADDR); 748 paddr = elf_get_addr(e, v, P_PADDR); 749 filesz = elf_get_size(e, v, P_FILESZ); 750 memsz = elf_get_size(e, v, P_MEMSZ); 751 flags = elf_get_word(e, v, P_FLAGS); 752 align = elf_get_size(e, v, P_ALIGN); 753 fprintf(out, "\n"); 754 fprintf(out, "entry: %d\n", i); 755 fprintf(out, "\tp_type: %s\n", p_types[type & 0x7]); 756 fprintf(out, "\tp_offset: %jd\n", (intmax_t)offset); 757 fprintf(out, "\tp_vaddr: %#jx\n", (intmax_t)vaddr); 758 fprintf(out, "\tp_paddr: %#jx\n", (intmax_t)paddr); 759 fprintf(out, "\tp_filesz: %jd\n", (intmax_t)filesz); 760 fprintf(out, "\tp_memsz: %jd\n", (intmax_t)memsz); 761 fprintf(out, "\tp_flags: %s\n", p_flags[flags]); 762 fprintf(out, "\tp_align: %jd\n", (intmax_t)align); 763 } 764 } 765 766 static void 767 elf_print_shdr(Elf32_Ehdr *e, void *sh) 768 { 769 u_int64_t shentsize; 770 u_int64_t shnum; 771 u_int64_t name; 772 u_int64_t type; 773 u_int64_t flags; 774 u_int64_t addr; 775 u_int64_t offset; 776 u_int64_t size; 777 u_int64_t shlink; 778 u_int64_t info; 779 u_int64_t addralign; 780 u_int64_t entsize; 781 u_int64_t machine; 782 void *v; 783 int i; 784 785 if (sh == NULL) { 786 fprintf(out, "\nNo section headers\n"); 787 return; 788 } 789 790 machine = elf_get_quarter(e, e, E_MACHINE); 791 shentsize = elf_get_quarter(e, e, E_SHENTSIZE); 792 shnum = elf_get_shnum(e, sh); 793 fprintf(out, "\nsection header:\n"); 794 for (i = 0; (u_int64_t)i < shnum; i++) { 795 v = (char *)sh + i * shentsize; 796 name = elf_get_word(e, v, SH_NAME); 797 type = elf_get_word(e, v, SH_TYPE); 798 flags = elf_get_word(e, v, SH_FLAGS); 799 addr = elf_get_addr(e, v, SH_ADDR); 800 offset = elf_get_off(e, v, SH_OFFSET); 801 size = elf_get_size(e, v, SH_SIZE); 802 shlink = elf_get_word(e, v, SH_LINK); 803 info = elf_get_word(e, v, SH_INFO); 804 addralign = elf_get_size(e, v, SH_ADDRALIGN); 805 entsize = elf_get_size(e, v, SH_ENTSIZE); 806 fprintf(out, "\n"); 807 fprintf(out, "entry: %d\n", i); 808 fprintf(out, "\tsh_name: %s\n", shstrtab + name); 809 fprintf(out, "\tsh_type: %s\n", sh_types(machine, type)); 810 fprintf(out, "\tsh_flags: %s\n", sh_flags[flags & 0x7]); 811 fprintf(out, "\tsh_addr: %#jx\n", addr); 812 fprintf(out, "\tsh_offset: %jd\n", (intmax_t)offset); 813 fprintf(out, "\tsh_size: %jd\n", (intmax_t)size); 814 fprintf(out, "\tsh_link: %jd\n", (intmax_t)shlink); 815 fprintf(out, "\tsh_info: %jd\n", (intmax_t)info); 816 fprintf(out, "\tsh_addralign: %jd\n", (intmax_t)addralign); 817 fprintf(out, "\tsh_entsize: %jd\n", (intmax_t)entsize); 818 } 819 } 820 821 static void 822 elf_print_symtab(Elf32_Ehdr *e, void *sh, char *str) 823 { 824 u_int64_t offset; 825 u_int64_t entsize; 826 u_int64_t size; 827 u_int64_t name; 828 u_int64_t value; 829 u_int64_t info; 830 u_int64_t shndx; 831 void *st; 832 int len; 833 int i; 834 835 offset = elf_get_off(e, sh, SH_OFFSET); 836 entsize = elf_get_size(e, sh, SH_ENTSIZE); 837 size = elf_get_size(e, sh, SH_SIZE); 838 name = elf_get_word(e, sh, SH_NAME); 839 len = size / entsize; 840 fprintf(out, "\nsymbol table (%s):\n", shstrtab + name); 841 for (i = 0; i < len; i++) { 842 st = (char *)e + offset + i * entsize; 843 name = elf_get_word(e, st, ST_NAME); 844 value = elf_get_addr(e, st, ST_VALUE); 845 size = elf_get_size(e, st, ST_SIZE); 846 info = elf_get_byte(e, st, ST_INFO); 847 shndx = elf_get_quarter(e, st, ST_SHNDX); 848 fprintf(out, "\n"); 849 fprintf(out, "entry: %d\n", i); 850 fprintf(out, "\tst_name: %s\n", str + name); 851 fprintf(out, "\tst_value: %#jx\n", value); 852 fprintf(out, "\tst_size: %jd\n", (intmax_t)size); 853 fprintf(out, "\tst_info: %s %s\n", 854 st_types[ELF32_ST_TYPE(info)], 855 st_bindings[ELF32_ST_BIND(info)]); 856 fprintf(out, "\tst_shndx: %jd\n", (intmax_t)shndx); 857 } 858 } 859 860 static void 861 elf_print_dynamic(Elf32_Ehdr *e, void *sh) 862 { 863 u_int64_t offset; 864 u_int64_t entsize; 865 u_int64_t size; 866 int64_t tag; 867 u_int64_t ptr; 868 u_int64_t val; 869 void *d; 870 int i; 871 872 offset = elf_get_off(e, sh, SH_OFFSET); 873 entsize = elf_get_size(e, sh, SH_ENTSIZE); 874 size = elf_get_size(e, sh, SH_SIZE); 875 fprintf(out, "\ndynamic:\n"); 876 for (i = 0; (u_int64_t)i < size / entsize; i++) { 877 d = (char *)e + offset + i * entsize; 878 tag = elf_get_size(e, d, D_TAG); 879 ptr = elf_get_size(e, d, D_PTR); 880 val = elf_get_addr(e, d, D_VAL); 881 fprintf(out, "\n"); 882 fprintf(out, "entry: %d\n", i); 883 fprintf(out, "\td_tag: %s\n", d_tags(tag)); 884 switch (tag) { 885 case DT_NEEDED: 886 case DT_SONAME: 887 case DT_RPATH: 888 fprintf(out, "\td_val: %s\n", dynstr + val); 889 break; 890 case DT_PLTRELSZ: 891 case DT_RELA: 892 case DT_RELASZ: 893 case DT_RELAENT: 894 case DT_STRSZ: 895 case DT_SYMENT: 896 case DT_RELSZ: 897 case DT_RELENT: 898 case DT_PLTREL: 899 fprintf(out, "\td_val: %jd\n", (intmax_t)val); 900 break; 901 case DT_PLTGOT: 902 case DT_HASH: 903 case DT_STRTAB: 904 case DT_SYMTAB: 905 case DT_INIT: 906 case DT_FINI: 907 case DT_REL: 908 case DT_JMPREL: 909 fprintf(out, "\td_ptr: %#jx\n", ptr); 910 break; 911 case DT_NULL: 912 case DT_SYMBOLIC: 913 case DT_DEBUG: 914 case DT_TEXTREL: 915 break; 916 } 917 } 918 } 919 920 static void 921 elf_print_rela(Elf32_Ehdr *e, void *sh) 922 { 923 u_int64_t offset; 924 u_int64_t entsize; 925 u_int64_t size; 926 u_int64_t name; 927 u_int64_t info; 928 int64_t addend; 929 void *ra; 930 void *v; 931 int i; 932 933 offset = elf_get_off(e, sh, SH_OFFSET); 934 entsize = elf_get_size(e, sh, SH_ENTSIZE); 935 size = elf_get_size(e, sh, SH_SIZE); 936 name = elf_get_word(e, sh, SH_NAME); 937 v = (char *)e + offset; 938 fprintf(out, "\nrelocation with addend (%s):\n", shstrtab + name); 939 for (i = 0; (u_int64_t)i < size / entsize; i++) { 940 ra = (char *)v + i * entsize; 941 offset = elf_get_addr(e, ra, RA_OFFSET); 942 info = elf_get_word(e, ra, RA_INFO); 943 addend = elf_get_off(e, ra, RA_ADDEND); 944 fprintf(out, "\n"); 945 fprintf(out, "entry: %d\n", i); 946 fprintf(out, "\tr_offset: %#jx\n", offset); 947 fprintf(out, "\tr_info: %jd\n", (intmax_t)info); 948 fprintf(out, "\tr_addend: %jd\n", (intmax_t)addend); 949 } 950 } 951 952 static void 953 elf_print_rel(Elf32_Ehdr *e, void *sh) 954 { 955 u_int64_t offset; 956 u_int64_t entsize; 957 u_int64_t size; 958 u_int64_t name; 959 u_int64_t info; 960 void *r; 961 void *v; 962 int i; 963 964 offset = elf_get_off(e, sh, SH_OFFSET); 965 entsize = elf_get_size(e, sh, SH_ENTSIZE); 966 size = elf_get_size(e, sh, SH_SIZE); 967 name = elf_get_word(e, sh, SH_NAME); 968 v = (char *)e + offset; 969 fprintf(out, "\nrelocation (%s):\n", shstrtab + name); 970 for (i = 0; (u_int64_t)i < size / entsize; i++) { 971 r = (char *)v + i * entsize; 972 offset = elf_get_addr(e, r, R_OFFSET); 973 info = elf_get_word(e, r, R_INFO); 974 fprintf(out, "\n"); 975 fprintf(out, "entry: %d\n", i); 976 fprintf(out, "\tr_offset: %#jx\n", offset); 977 fprintf(out, "\tr_info: %jd\n", (intmax_t)info); 978 } 979 } 980 981 static void 982 elf_print_interp(Elf32_Ehdr *e, void *p) 983 { 984 u_int64_t offset; 985 char *s; 986 987 offset = elf_get_off(e, p, P_OFFSET); 988 s = (char *)e + offset; 989 fprintf(out, "\ninterp:\n"); 990 fprintf(out, "\t%s\n", s); 991 } 992 993 static void 994 elf_print_got(Elf32_Ehdr *e, void *sh) 995 { 996 u_int64_t offset; 997 u_int64_t addralign; 998 u_int64_t size; 999 u_int64_t addr; 1000 void *v; 1001 int i; 1002 1003 offset = elf_get_off(e, sh, SH_OFFSET); 1004 addralign = elf_get_size(e, sh, SH_ADDRALIGN); 1005 size = elf_get_size(e, sh, SH_SIZE); 1006 v = (char *)e + offset; 1007 fprintf(out, "\nglobal offset table:\n"); 1008 for (i = 0; (u_int64_t)i < size / addralign; i++) { 1009 addr = elf_get_addr(e, (char *)v + i * addralign, 0); 1010 fprintf(out, "\n"); 1011 fprintf(out, "entry: %d\n", i); 1012 fprintf(out, "\t%#jx\n", addr); 1013 } 1014 } 1015 1016 static void 1017 elf_print_hash(Elf32_Ehdr *e __unused, void *sh __unused) 1018 { 1019 } 1020 1021 static void 1022 elf_print_note(Elf32_Ehdr *e, void *sh) 1023 { 1024 u_int64_t offset; 1025 u_int64_t size; 1026 u_int64_t name; 1027 u_int32_t namesz; 1028 u_int32_t descsz; 1029 u_int32_t desc; 1030 char *n, *s; 1031 1032 offset = elf_get_off(e, sh, SH_OFFSET); 1033 size = elf_get_size(e, sh, SH_SIZE); 1034 name = elf_get_word(e, sh, SH_NAME); 1035 n = (char *)e + offset; 1036 fprintf(out, "\nnote (%s):\n", shstrtab + name); 1037 while (n < ((char *)e + offset + size)) { 1038 namesz = elf_get_word(e, n, N_NAMESZ); 1039 descsz = elf_get_word(e, n, N_DESCSZ); 1040 s = n + sizeof(Elf_Note); 1041 desc = elf_get_word(e, n + sizeof(Elf_Note) + namesz, 0); 1042 fprintf(out, "\t%s %d\n", s, desc); 1043 n += sizeof(Elf_Note) + namesz + descsz; 1044 } 1045 } 1046 1047 static u_int64_t 1048 elf_get_byte(Elf32_Ehdr *e, void *base, elf_member_t member) 1049 { 1050 u_int64_t val; 1051 1052 val = 0; 1053 switch (e->e_ident[EI_CLASS]) { 1054 case ELFCLASS32: 1055 val = ((uint8_t *)base)[elf32_offsets[member]]; 1056 break; 1057 case ELFCLASS64: 1058 val = ((uint8_t *)base)[elf64_offsets[member]]; 1059 break; 1060 case ELFCLASSNONE: 1061 errx(1, "invalid class"); 1062 } 1063 1064 return val; 1065 } 1066 1067 static u_int64_t 1068 elf_get_quarter(Elf32_Ehdr *e, void *base, elf_member_t member) 1069 { 1070 u_int64_t val; 1071 1072 val = 0; 1073 switch (e->e_ident[EI_CLASS]) { 1074 case ELFCLASS32: 1075 base = (char *)base + elf32_offsets[member]; 1076 switch (e->e_ident[EI_DATA]) { 1077 case ELFDATA2MSB: 1078 val = be16dec(base); 1079 break; 1080 case ELFDATA2LSB: 1081 val = le16dec(base); 1082 break; 1083 case ELFDATANONE: 1084 errx(1, "invalid data format"); 1085 } 1086 break; 1087 case ELFCLASS64: 1088 base = (char *)base + elf64_offsets[member]; 1089 switch (e->e_ident[EI_DATA]) { 1090 case ELFDATA2MSB: 1091 val = be16dec(base); 1092 break; 1093 case ELFDATA2LSB: 1094 val = le16dec(base); 1095 break; 1096 case ELFDATANONE: 1097 errx(1, "invalid data format"); 1098 } 1099 break; 1100 case ELFCLASSNONE: 1101 errx(1, "invalid class"); 1102 } 1103 1104 return val; 1105 } 1106 1107 #if 0 1108 static u_int64_t 1109 elf_get_half(Elf32_Ehdr *e, void *base, elf_member_t member) 1110 { 1111 u_int64_t val; 1112 1113 val = 0; 1114 switch (e->e_ident[EI_CLASS]) { 1115 case ELFCLASS32: 1116 base = (char *)base + elf32_offsets[member]; 1117 switch (e->e_ident[EI_DATA]) { 1118 case ELFDATA2MSB: 1119 val = be16dec(base); 1120 break; 1121 case ELFDATA2LSB: 1122 val = le16dec(base); 1123 break; 1124 case ELFDATANONE: 1125 errx(1, "invalid data format"); 1126 } 1127 break; 1128 case ELFCLASS64: 1129 base = (char *)base + elf64_offsets[member]; 1130 switch (e->e_ident[EI_DATA]) { 1131 case ELFDATA2MSB: 1132 val = be32dec(base); 1133 break; 1134 case ELFDATA2LSB: 1135 val = le32dec(base); 1136 break; 1137 case ELFDATANONE: 1138 errx(1, "invalid data format"); 1139 } 1140 break; 1141 case ELFCLASSNONE: 1142 errx(1, "invalid class"); 1143 } 1144 1145 return val; 1146 } 1147 #endif 1148 1149 static u_int64_t 1150 elf_get_word(Elf32_Ehdr *e, void *base, elf_member_t member) 1151 { 1152 u_int64_t val; 1153 1154 val = 0; 1155 switch (e->e_ident[EI_CLASS]) { 1156 case ELFCLASS32: 1157 base = (char *)base + elf32_offsets[member]; 1158 switch (e->e_ident[EI_DATA]) { 1159 case ELFDATA2MSB: 1160 val = be32dec(base); 1161 break; 1162 case ELFDATA2LSB: 1163 val = le32dec(base); 1164 break; 1165 case ELFDATANONE: 1166 errx(1, "invalid data format"); 1167 } 1168 break; 1169 case ELFCLASS64: 1170 base = (char *)base + elf64_offsets[member]; 1171 switch (e->e_ident[EI_DATA]) { 1172 case ELFDATA2MSB: 1173 val = be32dec(base); 1174 break; 1175 case ELFDATA2LSB: 1176 val = le32dec(base); 1177 break; 1178 case ELFDATANONE: 1179 errx(1, "invalid data format"); 1180 } 1181 break; 1182 case ELFCLASSNONE: 1183 errx(1, "invalid class"); 1184 } 1185 1186 return val; 1187 } 1188 1189 static u_int64_t 1190 elf_get_quad(Elf32_Ehdr *e, void *base, elf_member_t member) 1191 { 1192 u_int64_t val; 1193 1194 val = 0; 1195 switch (e->e_ident[EI_CLASS]) { 1196 case ELFCLASS32: 1197 base = (char *)base + elf32_offsets[member]; 1198 switch (e->e_ident[EI_DATA]) { 1199 case ELFDATA2MSB: 1200 val = be32dec(base); 1201 break; 1202 case ELFDATA2LSB: 1203 val = le32dec(base); 1204 break; 1205 case ELFDATANONE: 1206 errx(1, "invalid data format"); 1207 } 1208 break; 1209 case ELFCLASS64: 1210 base = (char *)base + elf64_offsets[member]; 1211 switch (e->e_ident[EI_DATA]) { 1212 case ELFDATA2MSB: 1213 val = be64dec(base); 1214 break; 1215 case ELFDATA2LSB: 1216 val = le64dec(base); 1217 break; 1218 case ELFDATANONE: 1219 errx(1, "invalid data format"); 1220 } 1221 break; 1222 case ELFCLASSNONE: 1223 errx(1, "invalid class"); 1224 } 1225 1226 return val; 1227 } 1228 1229 static void 1230 usage(void) 1231 { 1232 fprintf(stderr, "usage: elfdump -a | -cdeGhinprs [-w file] file\n"); 1233 exit(1); 1234 } 1235