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 case EM_RISCV: return "EM_RISCV"; 276 } 277 snprintf(machdesc, sizeof(machdesc), 278 "(unknown machine) -- type 0x%x", mach); 279 return (machdesc); 280 } 281 282 static const char *e_types[] = { 283 "ET_NONE", "ET_REL", "ET_EXEC", "ET_DYN", "ET_CORE" 284 }; 285 286 static const char *ei_versions[] = { 287 "EV_NONE", "EV_CURRENT" 288 }; 289 290 static const char *ei_classes[] = { 291 "ELFCLASSNONE", "ELFCLASS32", "ELFCLASS64" 292 }; 293 294 static const char *ei_data[] = { 295 "ELFDATANONE", "ELFDATA2LSB", "ELFDATA2MSB" 296 }; 297 298 static 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 }; 305 306 static const char *p_types[] = { 307 "PT_NULL", "PT_LOAD", "PT_DYNAMIC", "PT_INTERP", "PT_NOTE", 308 "PT_SHLIB", "PT_PHDR", "PT_TLS" 309 }; 310 311 static 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 */ 317 static const char * 318 sh_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 case SHT_MIPS_ABIFLAGS: return "SHT_MIPS_ABIFLAGS"; 384 } 385 break; 386 } 387 switch (sht) { 388 case 0x7ffffffd: return "XXX:AUXILIARY"; 389 case 0x7fffffff: return "XXX:FILTER"; 390 } 391 snprintf(unknown_buf, sizeof(unknown_buf), 392 "ERROR: PROCESSOR-SPECIFIC SHT 0x%jx NOT DEFINED", 393 (uintmax_t)sht); 394 return (unknown_buf); 395 } else { 396 /* 0x80000000-0xffffffff application programs */ 397 snprintf(unknown_buf, sizeof(unknown_buf), 398 "ERROR: SHT 0x%jx NOT DEFINED", 399 (uintmax_t)sht); 400 return (unknown_buf); 401 } 402 } 403 404 static const char *sh_flags[] = { 405 "", "SHF_WRITE", "SHF_ALLOC", "SHF_WRITE|SHF_ALLOC", "SHF_EXECINSTR", 406 "SHF_WRITE|SHF_EXECINSTR", "SHF_ALLOC|SHF_EXECINSTR", 407 "SHF_WRITE|SHF_ALLOC|SHF_EXECINSTR" 408 }; 409 410 static const char *st_types[] = { 411 "STT_NOTYPE", "STT_OBJECT", "STT_FUNC", "STT_SECTION", "STT_FILE" 412 }; 413 414 static const char *st_bindings[] = { 415 "STB_LOCAL", "STB_GLOBAL", "STB_WEAK" 416 }; 417 418 static char *dynstr; 419 static char *shstrtab; 420 static char *strtab; 421 static FILE *out; 422 423 static u_int64_t elf_get_byte(Elf32_Ehdr *e, void *base, elf_member_t member); 424 static u_int64_t elf_get_quarter(Elf32_Ehdr *e, void *base, 425 elf_member_t member); 426 #if 0 427 static u_int64_t elf_get_half(Elf32_Ehdr *e, void *base, elf_member_t member); 428 #endif 429 static u_int64_t elf_get_word(Elf32_Ehdr *e, void *base, elf_member_t member); 430 static u_int64_t elf_get_quad(Elf32_Ehdr *e, void *base, elf_member_t member); 431 432 static void elf_print_ehdr(Elf32_Ehdr *e, void *sh); 433 static void elf_print_phdr(Elf32_Ehdr *e, void *p); 434 static void elf_print_shdr(Elf32_Ehdr *e, void *sh); 435 static void elf_print_symtab(Elf32_Ehdr *e, void *sh, char *str); 436 static void elf_print_dynamic(Elf32_Ehdr *e, void *sh); 437 static void elf_print_rel(Elf32_Ehdr *e, void *r); 438 static void elf_print_rela(Elf32_Ehdr *e, void *ra); 439 static void elf_print_interp(Elf32_Ehdr *e, void *p); 440 static void elf_print_got(Elf32_Ehdr *e, void *sh); 441 static void elf_print_hash(Elf32_Ehdr *e, void *sh); 442 static void elf_print_note(Elf32_Ehdr *e, void *sh); 443 444 static void usage(void); 445 446 /* 447 * Helpers for ELF files with shnum or shstrndx values that don't fit in the 448 * ELF header. If the values are too large then an escape value is used to 449 * indicate that the actual value is found in one of section 0's fields. 450 */ 451 static uint64_t 452 elf_get_shnum(Elf32_Ehdr *e, void *sh) 453 { 454 uint64_t shnum; 455 456 shnum = elf_get_quarter(e, e, E_SHNUM); 457 if (shnum == 0) 458 shnum = elf_get_word(e, (char *)sh, SH_SIZE); 459 return shnum; 460 } 461 462 static uint64_t 463 elf_get_shstrndx(Elf32_Ehdr *e, void *sh) 464 { 465 uint64_t shstrndx; 466 467 shstrndx = elf_get_quarter(e, e, E_SHSTRNDX); 468 if (shstrndx == SHN_XINDEX) 469 shstrndx = elf_get_word(e, (char *)sh, SH_LINK); 470 return shstrndx; 471 } 472 473 int 474 main(int ac, char **av) 475 { 476 cap_rights_t rights; 477 u_int64_t phoff; 478 u_int64_t shoff; 479 u_int64_t phentsize; 480 u_int64_t phnum; 481 u_int64_t shentsize; 482 u_int64_t shnum; 483 u_int64_t shstrndx; 484 u_int64_t offset; 485 u_int64_t name; 486 u_int64_t type; 487 struct stat sb; 488 u_int flags; 489 Elf32_Ehdr *e; 490 void *p; 491 void *sh; 492 void *v; 493 int fd; 494 int ch; 495 int i; 496 497 out = stdout; 498 flags = 0; 499 while ((ch = getopt(ac, av, "acdeiGhnprsw:")) != -1) 500 switch (ch) { 501 case 'a': 502 flags = ED_ALL; 503 break; 504 case 'c': 505 flags |= ED_SHDR; 506 break; 507 case 'd': 508 flags |= ED_DYN; 509 break; 510 case 'e': 511 flags |= ED_EHDR; 512 break; 513 case 'i': 514 flags |= ED_INTERP; 515 break; 516 case 'G': 517 flags |= ED_GOT; 518 break; 519 case 'h': 520 flags |= ED_HASH; 521 break; 522 case 'n': 523 flags |= ED_NOTE; 524 break; 525 case 'p': 526 flags |= ED_PHDR; 527 break; 528 case 'r': 529 flags |= ED_REL; 530 break; 531 case 's': 532 flags |= ED_SYMTAB; 533 break; 534 case 'w': 535 if ((out = fopen(optarg, "w")) == NULL) 536 err(1, "%s", optarg); 537 cap_rights_init(&rights, CAP_FSTAT, CAP_WRITE); 538 if (cap_rights_limit(fileno(out), &rights) < 0 && errno != ENOSYS) 539 err(1, "unable to limit rights for %s", optarg); 540 break; 541 case '?': 542 default: 543 usage(); 544 } 545 ac -= optind; 546 av += optind; 547 if (ac == 0 || flags == 0) 548 usage(); 549 if ((fd = open(*av, O_RDONLY)) < 0 || 550 fstat(fd, &sb) < 0) 551 err(1, "%s", *av); 552 cap_rights_init(&rights, CAP_MMAP_R); 553 if (cap_rights_limit(fd, &rights) < 0 && errno != ENOSYS) 554 err(1, "unable to limit rights for %s", *av); 555 close(STDIN_FILENO); 556 cap_rights_init(&rights, CAP_WRITE); 557 if (cap_rights_limit(STDOUT_FILENO, &rights) < 0 && errno != ENOSYS) 558 err(1, "unable to limit rights for stdout"); 559 if (cap_rights_limit(STDERR_FILENO, &rights) < 0 && errno != ENOSYS) 560 err(1, "unable to limit rights for stderr"); 561 if (cap_enter() < 0 && errno != ENOSYS) 562 err(1, "unable to enter capability mode"); 563 e = mmap(NULL, sb.st_size, PROT_READ, MAP_SHARED, fd, 0); 564 if (e == MAP_FAILED) 565 err(1, NULL); 566 if (!IS_ELF(*(Elf32_Ehdr *)e)) 567 errx(1, "not an elf file"); 568 phoff = elf_get_off(e, e, E_PHOFF); 569 shoff = elf_get_off(e, e, E_SHOFF); 570 phentsize = elf_get_quarter(e, e, E_PHENTSIZE); 571 phnum = elf_get_quarter(e, e, E_PHNUM); 572 shentsize = elf_get_quarter(e, e, E_SHENTSIZE); 573 p = (char *)e + phoff; 574 if (shoff > 0) { 575 sh = (char *)e + shoff; 576 shnum = elf_get_shnum(e, sh); 577 shstrndx = elf_get_shstrndx(e, sh); 578 offset = elf_get_off(e, (char *)sh + shstrndx * shentsize, 579 SH_OFFSET); 580 shstrtab = (char *)e + offset; 581 } else { 582 sh = NULL; 583 shnum = 0; 584 shstrndx = 0; 585 shstrtab = NULL; 586 } 587 for (i = 0; (u_int64_t)i < shnum; i++) { 588 name = elf_get_word(e, (char *)sh + i * shentsize, SH_NAME); 589 offset = elf_get_off(e, (char *)sh + i * shentsize, SH_OFFSET); 590 if (strcmp(shstrtab + name, ".strtab") == 0) 591 strtab = (char *)e + offset; 592 if (strcmp(shstrtab + name, ".dynstr") == 0) 593 dynstr = (char *)e + offset; 594 } 595 if (flags & ED_EHDR) 596 elf_print_ehdr(e, sh); 597 if (flags & ED_PHDR) 598 elf_print_phdr(e, p); 599 if (flags & ED_SHDR) 600 elf_print_shdr(e, sh); 601 for (i = 0; (u_int64_t)i < phnum; i++) { 602 v = (char *)p + i * phentsize; 603 type = elf_get_word(e, v, P_TYPE); 604 switch (type) { 605 case PT_INTERP: 606 if (flags & ED_INTERP) 607 elf_print_interp(e, v); 608 break; 609 case PT_NULL: 610 case PT_LOAD: 611 case PT_DYNAMIC: 612 case PT_NOTE: 613 case PT_SHLIB: 614 case PT_PHDR: 615 break; 616 } 617 } 618 for (i = 0; (u_int64_t)i < shnum; i++) { 619 v = (char *)sh + i * shentsize; 620 type = elf_get_word(e, v, SH_TYPE); 621 switch (type) { 622 case SHT_SYMTAB: 623 if (flags & ED_SYMTAB) 624 elf_print_symtab(e, v, strtab); 625 break; 626 case SHT_DYNAMIC: 627 if (flags & ED_DYN) 628 elf_print_dynamic(e, v); 629 break; 630 case SHT_RELA: 631 if (flags & ED_REL) 632 elf_print_rela(e, v); 633 break; 634 case SHT_REL: 635 if (flags & ED_REL) 636 elf_print_rel(e, v); 637 break; 638 case SHT_NOTE: 639 name = elf_get_word(e, v, SH_NAME); 640 if (flags & ED_NOTE && 641 strcmp(shstrtab + name, ".note.ABI-tag") == 0) 642 elf_print_note(e, v); 643 break; 644 case SHT_DYNSYM: 645 if (flags & ED_SYMTAB) 646 elf_print_symtab(e, v, dynstr); 647 break; 648 case SHT_PROGBITS: 649 name = elf_get_word(e, v, SH_NAME); 650 if (flags & ED_GOT && 651 strcmp(shstrtab + name, ".got") == 0) 652 elf_print_got(e, v); 653 break; 654 case SHT_HASH: 655 if (flags & ED_HASH) 656 elf_print_hash(e, v); 657 break; 658 case SHT_NULL: 659 case SHT_STRTAB: 660 case SHT_NOBITS: 661 case SHT_SHLIB: 662 break; 663 } 664 } 665 666 return 0; 667 } 668 669 static void 670 elf_print_ehdr(Elf32_Ehdr *e, void *sh) 671 { 672 u_int64_t class; 673 u_int64_t data; 674 u_int64_t osabi; 675 u_int64_t type; 676 u_int64_t machine; 677 u_int64_t version; 678 u_int64_t entry; 679 u_int64_t phoff; 680 u_int64_t shoff; 681 u_int64_t flags; 682 u_int64_t ehsize; 683 u_int64_t phentsize; 684 u_int64_t phnum; 685 u_int64_t shentsize; 686 u_int64_t shnum; 687 u_int64_t shstrndx; 688 689 class = elf_get_byte(e, e, E_CLASS); 690 data = elf_get_byte(e, e, E_DATA); 691 osabi = elf_get_byte(e, e, E_OSABI); 692 type = elf_get_quarter(e, e, E_TYPE); 693 machine = elf_get_quarter(e, e, E_MACHINE); 694 version = elf_get_word(e, e, E_VERSION); 695 entry = elf_get_addr(e, e, E_ENTRY); 696 phoff = elf_get_off(e, e, E_PHOFF); 697 shoff = elf_get_off(e, e, E_SHOFF); 698 flags = elf_get_word(e, e, E_FLAGS); 699 ehsize = elf_get_quarter(e, e, E_EHSIZE); 700 phentsize = elf_get_quarter(e, e, E_PHENTSIZE); 701 phnum = elf_get_quarter(e, e, E_PHNUM); 702 shentsize = elf_get_quarter(e, e, E_SHENTSIZE); 703 fprintf(out, "\nelf header:\n"); 704 fprintf(out, "\n"); 705 fprintf(out, "\te_ident: %s %s %s\n", ei_classes[class], ei_data[data], 706 ei_abis[osabi]); 707 fprintf(out, "\te_type: %s\n", e_types[type]); 708 fprintf(out, "\te_machine: %s\n", e_machines(machine)); 709 fprintf(out, "\te_version: %s\n", ei_versions[version]); 710 fprintf(out, "\te_entry: %#jx\n", (intmax_t)entry); 711 fprintf(out, "\te_phoff: %jd\n", (intmax_t)phoff); 712 fprintf(out, "\te_shoff: %jd\n", (intmax_t)shoff); 713 fprintf(out, "\te_flags: %jd\n", (intmax_t)flags); 714 fprintf(out, "\te_ehsize: %jd\n", (intmax_t)ehsize); 715 fprintf(out, "\te_phentsize: %jd\n", (intmax_t)phentsize); 716 fprintf(out, "\te_phnum: %jd\n", (intmax_t)phnum); 717 fprintf(out, "\te_shentsize: %jd\n", (intmax_t)shentsize); 718 if (sh != NULL) { 719 shnum = elf_get_shnum(e, sh); 720 shstrndx = elf_get_shstrndx(e, sh); 721 fprintf(out, "\te_shnum: %jd\n", (intmax_t)shnum); 722 fprintf(out, "\te_shstrndx: %jd\n", (intmax_t)shstrndx); 723 } 724 } 725 726 static void 727 elf_print_phdr(Elf32_Ehdr *e, void *p) 728 { 729 u_int64_t phentsize; 730 u_int64_t phnum; 731 u_int64_t type; 732 u_int64_t offset; 733 u_int64_t vaddr; 734 u_int64_t paddr; 735 u_int64_t filesz; 736 u_int64_t memsz; 737 u_int64_t flags; 738 u_int64_t align; 739 void *v; 740 int i; 741 742 phentsize = elf_get_quarter(e, e, E_PHENTSIZE); 743 phnum = elf_get_quarter(e, e, E_PHNUM); 744 fprintf(out, "\nprogram header:\n"); 745 for (i = 0; (u_int64_t)i < phnum; i++) { 746 v = (char *)p + i * phentsize; 747 type = elf_get_word(e, v, P_TYPE); 748 offset = elf_get_off(e, v, P_OFFSET); 749 vaddr = elf_get_addr(e, v, P_VADDR); 750 paddr = elf_get_addr(e, v, P_PADDR); 751 filesz = elf_get_size(e, v, P_FILESZ); 752 memsz = elf_get_size(e, v, P_MEMSZ); 753 flags = elf_get_word(e, v, P_FLAGS); 754 align = elf_get_size(e, v, P_ALIGN); 755 fprintf(out, "\n"); 756 fprintf(out, "entry: %d\n", i); 757 fprintf(out, "\tp_type: %s\n", p_types[type & 0x7]); 758 fprintf(out, "\tp_offset: %jd\n", (intmax_t)offset); 759 fprintf(out, "\tp_vaddr: %#jx\n", (intmax_t)vaddr); 760 fprintf(out, "\tp_paddr: %#jx\n", (intmax_t)paddr); 761 fprintf(out, "\tp_filesz: %jd\n", (intmax_t)filesz); 762 fprintf(out, "\tp_memsz: %jd\n", (intmax_t)memsz); 763 fprintf(out, "\tp_flags: %s\n", p_flags[flags]); 764 fprintf(out, "\tp_align: %jd\n", (intmax_t)align); 765 } 766 } 767 768 static void 769 elf_print_shdr(Elf32_Ehdr *e, void *sh) 770 { 771 u_int64_t shentsize; 772 u_int64_t shnum; 773 u_int64_t name; 774 u_int64_t type; 775 u_int64_t flags; 776 u_int64_t addr; 777 u_int64_t offset; 778 u_int64_t size; 779 u_int64_t shlink; 780 u_int64_t info; 781 u_int64_t addralign; 782 u_int64_t entsize; 783 u_int64_t machine; 784 void *v; 785 int i; 786 787 if (sh == NULL) { 788 fprintf(out, "\nNo section headers\n"); 789 return; 790 } 791 792 machine = elf_get_quarter(e, e, E_MACHINE); 793 shentsize = elf_get_quarter(e, e, E_SHENTSIZE); 794 shnum = elf_get_shnum(e, sh); 795 fprintf(out, "\nsection header:\n"); 796 for (i = 0; (u_int64_t)i < shnum; i++) { 797 v = (char *)sh + i * shentsize; 798 name = elf_get_word(e, v, SH_NAME); 799 type = elf_get_word(e, v, SH_TYPE); 800 flags = elf_get_word(e, v, SH_FLAGS); 801 addr = elf_get_addr(e, v, SH_ADDR); 802 offset = elf_get_off(e, v, SH_OFFSET); 803 size = elf_get_size(e, v, SH_SIZE); 804 shlink = elf_get_word(e, v, SH_LINK); 805 info = elf_get_word(e, v, SH_INFO); 806 addralign = elf_get_size(e, v, SH_ADDRALIGN); 807 entsize = elf_get_size(e, v, SH_ENTSIZE); 808 fprintf(out, "\n"); 809 fprintf(out, "entry: %d\n", i); 810 fprintf(out, "\tsh_name: %s\n", shstrtab + name); 811 fprintf(out, "\tsh_type: %s\n", sh_types(machine, type)); 812 fprintf(out, "\tsh_flags: %s\n", sh_flags[flags & 0x7]); 813 fprintf(out, "\tsh_addr: %#jx\n", addr); 814 fprintf(out, "\tsh_offset: %jd\n", (intmax_t)offset); 815 fprintf(out, "\tsh_size: %jd\n", (intmax_t)size); 816 fprintf(out, "\tsh_link: %jd\n", (intmax_t)shlink); 817 fprintf(out, "\tsh_info: %jd\n", (intmax_t)info); 818 fprintf(out, "\tsh_addralign: %jd\n", (intmax_t)addralign); 819 fprintf(out, "\tsh_entsize: %jd\n", (intmax_t)entsize); 820 } 821 } 822 823 static void 824 elf_print_symtab(Elf32_Ehdr *e, void *sh, char *str) 825 { 826 u_int64_t offset; 827 u_int64_t entsize; 828 u_int64_t size; 829 u_int64_t name; 830 u_int64_t value; 831 u_int64_t info; 832 u_int64_t shndx; 833 void *st; 834 int len; 835 int i; 836 837 offset = elf_get_off(e, sh, SH_OFFSET); 838 entsize = elf_get_size(e, sh, SH_ENTSIZE); 839 size = elf_get_size(e, sh, SH_SIZE); 840 name = elf_get_word(e, sh, SH_NAME); 841 len = size / entsize; 842 fprintf(out, "\nsymbol table (%s):\n", shstrtab + name); 843 for (i = 0; i < len; i++) { 844 st = (char *)e + offset + i * entsize; 845 name = elf_get_word(e, st, ST_NAME); 846 value = elf_get_addr(e, st, ST_VALUE); 847 size = elf_get_size(e, st, ST_SIZE); 848 info = elf_get_byte(e, st, ST_INFO); 849 shndx = elf_get_quarter(e, st, ST_SHNDX); 850 fprintf(out, "\n"); 851 fprintf(out, "entry: %d\n", i); 852 fprintf(out, "\tst_name: %s\n", str + name); 853 fprintf(out, "\tst_value: %#jx\n", value); 854 fprintf(out, "\tst_size: %jd\n", (intmax_t)size); 855 fprintf(out, "\tst_info: %s %s\n", 856 st_types[ELF32_ST_TYPE(info)], 857 st_bindings[ELF32_ST_BIND(info)]); 858 fprintf(out, "\tst_shndx: %jd\n", (intmax_t)shndx); 859 } 860 } 861 862 static void 863 elf_print_dynamic(Elf32_Ehdr *e, void *sh) 864 { 865 u_int64_t offset; 866 u_int64_t entsize; 867 u_int64_t size; 868 int64_t tag; 869 u_int64_t ptr; 870 u_int64_t val; 871 void *d; 872 int i; 873 874 offset = elf_get_off(e, sh, SH_OFFSET); 875 entsize = elf_get_size(e, sh, SH_ENTSIZE); 876 size = elf_get_size(e, sh, SH_SIZE); 877 fprintf(out, "\ndynamic:\n"); 878 for (i = 0; (u_int64_t)i < size / entsize; i++) { 879 d = (char *)e + offset + i * entsize; 880 tag = elf_get_size(e, d, D_TAG); 881 ptr = elf_get_size(e, d, D_PTR); 882 val = elf_get_addr(e, d, D_VAL); 883 fprintf(out, "\n"); 884 fprintf(out, "entry: %d\n", i); 885 fprintf(out, "\td_tag: %s\n", d_tags(tag)); 886 switch (tag) { 887 case DT_NEEDED: 888 case DT_SONAME: 889 case DT_RPATH: 890 fprintf(out, "\td_val: %s\n", dynstr + val); 891 break; 892 case DT_PLTRELSZ: 893 case DT_RELA: 894 case DT_RELASZ: 895 case DT_RELAENT: 896 case DT_STRSZ: 897 case DT_SYMENT: 898 case DT_RELSZ: 899 case DT_RELENT: 900 case DT_PLTREL: 901 fprintf(out, "\td_val: %jd\n", (intmax_t)val); 902 break; 903 case DT_PLTGOT: 904 case DT_HASH: 905 case DT_STRTAB: 906 case DT_SYMTAB: 907 case DT_INIT: 908 case DT_FINI: 909 case DT_REL: 910 case DT_JMPREL: 911 fprintf(out, "\td_ptr: %#jx\n", ptr); 912 break; 913 case DT_NULL: 914 case DT_SYMBOLIC: 915 case DT_DEBUG: 916 case DT_TEXTREL: 917 break; 918 } 919 } 920 } 921 922 static void 923 elf_print_rela(Elf32_Ehdr *e, void *sh) 924 { 925 u_int64_t offset; 926 u_int64_t entsize; 927 u_int64_t size; 928 u_int64_t name; 929 u_int64_t info; 930 int64_t addend; 931 void *ra; 932 void *v; 933 int i; 934 935 offset = elf_get_off(e, sh, SH_OFFSET); 936 entsize = elf_get_size(e, sh, SH_ENTSIZE); 937 size = elf_get_size(e, sh, SH_SIZE); 938 name = elf_get_word(e, sh, SH_NAME); 939 v = (char *)e + offset; 940 fprintf(out, "\nrelocation with addend (%s):\n", shstrtab + name); 941 for (i = 0; (u_int64_t)i < size / entsize; i++) { 942 ra = (char *)v + i * entsize; 943 offset = elf_get_addr(e, ra, RA_OFFSET); 944 info = elf_get_word(e, ra, RA_INFO); 945 addend = elf_get_off(e, ra, RA_ADDEND); 946 fprintf(out, "\n"); 947 fprintf(out, "entry: %d\n", i); 948 fprintf(out, "\tr_offset: %#jx\n", offset); 949 fprintf(out, "\tr_info: %jd\n", (intmax_t)info); 950 fprintf(out, "\tr_addend: %jd\n", (intmax_t)addend); 951 } 952 } 953 954 static void 955 elf_print_rel(Elf32_Ehdr *e, void *sh) 956 { 957 u_int64_t offset; 958 u_int64_t entsize; 959 u_int64_t size; 960 u_int64_t name; 961 u_int64_t info; 962 void *r; 963 void *v; 964 int i; 965 966 offset = elf_get_off(e, sh, SH_OFFSET); 967 entsize = elf_get_size(e, sh, SH_ENTSIZE); 968 size = elf_get_size(e, sh, SH_SIZE); 969 name = elf_get_word(e, sh, SH_NAME); 970 v = (char *)e + offset; 971 fprintf(out, "\nrelocation (%s):\n", shstrtab + name); 972 for (i = 0; (u_int64_t)i < size / entsize; i++) { 973 r = (char *)v + i * entsize; 974 offset = elf_get_addr(e, r, R_OFFSET); 975 info = elf_get_word(e, r, R_INFO); 976 fprintf(out, "\n"); 977 fprintf(out, "entry: %d\n", i); 978 fprintf(out, "\tr_offset: %#jx\n", offset); 979 fprintf(out, "\tr_info: %jd\n", (intmax_t)info); 980 } 981 } 982 983 static void 984 elf_print_interp(Elf32_Ehdr *e, void *p) 985 { 986 u_int64_t offset; 987 char *s; 988 989 offset = elf_get_off(e, p, P_OFFSET); 990 s = (char *)e + offset; 991 fprintf(out, "\ninterp:\n"); 992 fprintf(out, "\t%s\n", s); 993 } 994 995 static void 996 elf_print_got(Elf32_Ehdr *e, void *sh) 997 { 998 u_int64_t offset; 999 u_int64_t addralign; 1000 u_int64_t size; 1001 u_int64_t addr; 1002 void *v; 1003 int i; 1004 1005 offset = elf_get_off(e, sh, SH_OFFSET); 1006 addralign = elf_get_size(e, sh, SH_ADDRALIGN); 1007 size = elf_get_size(e, sh, SH_SIZE); 1008 v = (char *)e + offset; 1009 fprintf(out, "\nglobal offset table:\n"); 1010 for (i = 0; (u_int64_t)i < size / addralign; i++) { 1011 addr = elf_get_addr(e, (char *)v + i * addralign, 0); 1012 fprintf(out, "\n"); 1013 fprintf(out, "entry: %d\n", i); 1014 fprintf(out, "\t%#jx\n", addr); 1015 } 1016 } 1017 1018 static void 1019 elf_print_hash(Elf32_Ehdr *e __unused, void *sh __unused) 1020 { 1021 } 1022 1023 static void 1024 elf_print_note(Elf32_Ehdr *e, void *sh) 1025 { 1026 u_int64_t offset; 1027 u_int64_t size; 1028 u_int64_t name; 1029 u_int32_t namesz; 1030 u_int32_t descsz; 1031 u_int32_t desc; 1032 char *n, *s; 1033 1034 offset = elf_get_off(e, sh, SH_OFFSET); 1035 size = elf_get_size(e, sh, SH_SIZE); 1036 name = elf_get_word(e, sh, SH_NAME); 1037 n = (char *)e + offset; 1038 fprintf(out, "\nnote (%s):\n", shstrtab + name); 1039 while (n < ((char *)e + offset + size)) { 1040 namesz = elf_get_word(e, n, N_NAMESZ); 1041 descsz = elf_get_word(e, n, N_DESCSZ); 1042 s = n + sizeof(Elf_Note); 1043 desc = elf_get_word(e, n + sizeof(Elf_Note) + namesz, 0); 1044 fprintf(out, "\t%s %d\n", s, desc); 1045 n += sizeof(Elf_Note) + namesz + descsz; 1046 } 1047 } 1048 1049 static u_int64_t 1050 elf_get_byte(Elf32_Ehdr *e, void *base, elf_member_t member) 1051 { 1052 u_int64_t val; 1053 1054 val = 0; 1055 switch (e->e_ident[EI_CLASS]) { 1056 case ELFCLASS32: 1057 val = ((uint8_t *)base)[elf32_offsets[member]]; 1058 break; 1059 case ELFCLASS64: 1060 val = ((uint8_t *)base)[elf64_offsets[member]]; 1061 break; 1062 case ELFCLASSNONE: 1063 errx(1, "invalid class"); 1064 } 1065 1066 return val; 1067 } 1068 1069 static u_int64_t 1070 elf_get_quarter(Elf32_Ehdr *e, void *base, elf_member_t member) 1071 { 1072 u_int64_t val; 1073 1074 val = 0; 1075 switch (e->e_ident[EI_CLASS]) { 1076 case ELFCLASS32: 1077 base = (char *)base + elf32_offsets[member]; 1078 switch (e->e_ident[EI_DATA]) { 1079 case ELFDATA2MSB: 1080 val = be16dec(base); 1081 break; 1082 case ELFDATA2LSB: 1083 val = le16dec(base); 1084 break; 1085 case ELFDATANONE: 1086 errx(1, "invalid data format"); 1087 } 1088 break; 1089 case ELFCLASS64: 1090 base = (char *)base + elf64_offsets[member]; 1091 switch (e->e_ident[EI_DATA]) { 1092 case ELFDATA2MSB: 1093 val = be16dec(base); 1094 break; 1095 case ELFDATA2LSB: 1096 val = le16dec(base); 1097 break; 1098 case ELFDATANONE: 1099 errx(1, "invalid data format"); 1100 } 1101 break; 1102 case ELFCLASSNONE: 1103 errx(1, "invalid class"); 1104 } 1105 1106 return val; 1107 } 1108 1109 #if 0 1110 static u_int64_t 1111 elf_get_half(Elf32_Ehdr *e, void *base, elf_member_t member) 1112 { 1113 u_int64_t val; 1114 1115 val = 0; 1116 switch (e->e_ident[EI_CLASS]) { 1117 case ELFCLASS32: 1118 base = (char *)base + elf32_offsets[member]; 1119 switch (e->e_ident[EI_DATA]) { 1120 case ELFDATA2MSB: 1121 val = be16dec(base); 1122 break; 1123 case ELFDATA2LSB: 1124 val = le16dec(base); 1125 break; 1126 case ELFDATANONE: 1127 errx(1, "invalid data format"); 1128 } 1129 break; 1130 case ELFCLASS64: 1131 base = (char *)base + elf64_offsets[member]; 1132 switch (e->e_ident[EI_DATA]) { 1133 case ELFDATA2MSB: 1134 val = be32dec(base); 1135 break; 1136 case ELFDATA2LSB: 1137 val = le32dec(base); 1138 break; 1139 case ELFDATANONE: 1140 errx(1, "invalid data format"); 1141 } 1142 break; 1143 case ELFCLASSNONE: 1144 errx(1, "invalid class"); 1145 } 1146 1147 return val; 1148 } 1149 #endif 1150 1151 static u_int64_t 1152 elf_get_word(Elf32_Ehdr *e, void *base, elf_member_t member) 1153 { 1154 u_int64_t val; 1155 1156 val = 0; 1157 switch (e->e_ident[EI_CLASS]) { 1158 case ELFCLASS32: 1159 base = (char *)base + elf32_offsets[member]; 1160 switch (e->e_ident[EI_DATA]) { 1161 case ELFDATA2MSB: 1162 val = be32dec(base); 1163 break; 1164 case ELFDATA2LSB: 1165 val = le32dec(base); 1166 break; 1167 case ELFDATANONE: 1168 errx(1, "invalid data format"); 1169 } 1170 break; 1171 case ELFCLASS64: 1172 base = (char *)base + elf64_offsets[member]; 1173 switch (e->e_ident[EI_DATA]) { 1174 case ELFDATA2MSB: 1175 val = be32dec(base); 1176 break; 1177 case ELFDATA2LSB: 1178 val = le32dec(base); 1179 break; 1180 case ELFDATANONE: 1181 errx(1, "invalid data format"); 1182 } 1183 break; 1184 case ELFCLASSNONE: 1185 errx(1, "invalid class"); 1186 } 1187 1188 return val; 1189 } 1190 1191 static u_int64_t 1192 elf_get_quad(Elf32_Ehdr *e, void *base, elf_member_t member) 1193 { 1194 u_int64_t val; 1195 1196 val = 0; 1197 switch (e->e_ident[EI_CLASS]) { 1198 case ELFCLASS32: 1199 base = (char *)base + elf32_offsets[member]; 1200 switch (e->e_ident[EI_DATA]) { 1201 case ELFDATA2MSB: 1202 val = be32dec(base); 1203 break; 1204 case ELFDATA2LSB: 1205 val = le32dec(base); 1206 break; 1207 case ELFDATANONE: 1208 errx(1, "invalid data format"); 1209 } 1210 break; 1211 case ELFCLASS64: 1212 base = (char *)base + elf64_offsets[member]; 1213 switch (e->e_ident[EI_DATA]) { 1214 case ELFDATA2MSB: 1215 val = be64dec(base); 1216 break; 1217 case ELFDATA2LSB: 1218 val = le64dec(base); 1219 break; 1220 case ELFDATANONE: 1221 errx(1, "invalid data format"); 1222 } 1223 break; 1224 case ELFCLASSNONE: 1225 errx(1, "invalid class"); 1226 } 1227 1228 return val; 1229 } 1230 1231 static void 1232 usage(void) 1233 { 1234 fprintf(stderr, "usage: elfdump -a | -cdeGhinprs [-w file] file\n"); 1235 exit(1); 1236 } 1237