| 1 | /* simple-object-elf.c -- routines to manipulate ELF object files. |
| 2 | Copyright (C) 2010-2019 Free Software Foundation, Inc. |
| 3 | Written by Ian Lance Taylor, Google. |
| 4 | |
| 5 | This program is free software; you can redistribute it and/or modify it |
| 6 | under the terms of the GNU General Public License as published by the |
| 7 | Free Software Foundation; either version 2, or (at your option) any |
| 8 | later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program; if not, write to the Free Software |
| 17 | Foundation, 51 Franklin Street - Fifth Floor, |
| 18 | Boston, MA 02110-1301, USA. */ |
| 19 | |
| 20 | #include "config.h" |
| 21 | #include "libiberty.h" |
| 22 | #include "simple-object.h" |
| 23 | |
| 24 | #include <errno.h> |
| 25 | /* mingw.org's MinGW doesn't have ENOTSUP. */ |
| 26 | #ifndef ENOTSUP |
| 27 | # define ENOTSUP ENOSYS |
| 28 | #endif |
| 29 | #include <stddef.h> |
| 30 | |
| 31 | #ifdef HAVE_STDLIB_H |
| 32 | #include <stdlib.h> |
| 33 | #endif |
| 34 | |
| 35 | #ifdef HAVE_STDINT_H |
| 36 | #include <stdint.h> |
| 37 | #endif |
| 38 | |
| 39 | #ifdef HAVE_STRING_H |
| 40 | #include <string.h> |
| 41 | #endif |
| 42 | |
| 43 | #ifdef HAVE_INTTYPES_H |
| 44 | #include <inttypes.h> |
| 45 | #endif |
| 46 | |
| 47 | #include "simple-object-common.h" |
| 48 | |
| 49 | /* ELF structures and constants. */ |
| 50 | |
| 51 | /* 32-bit ELF file header. */ |
| 52 | |
| 53 | typedef struct { |
| 54 | unsigned char e_ident[16]; /* ELF "magic number" */ |
| 55 | unsigned char e_type[2]; /* Identifies object file type */ |
| 56 | unsigned char e_machine[2]; /* Specifies required architecture */ |
| 57 | unsigned char e_version[4]; /* Identifies object file version */ |
| 58 | unsigned char e_entry[4]; /* Entry point virtual address */ |
| 59 | unsigned char e_phoff[4]; /* Program header table file offset */ |
| 60 | unsigned char e_shoff[4]; /* Section header table file offset */ |
| 61 | unsigned char e_flags[4]; /* Processor-specific flags */ |
| 62 | unsigned char e_ehsize[2]; /* ELF header size in bytes */ |
| 63 | unsigned char e_phentsize[2]; /* Program header table entry size */ |
| 64 | unsigned char e_phnum[2]; /* Program header table entry count */ |
| 65 | unsigned char e_shentsize[2]; /* Section header table entry size */ |
| 66 | unsigned char e_shnum[2]; /* Section header table entry count */ |
| 67 | unsigned char e_shstrndx[2]; /* Section header string table index */ |
| 68 | } Elf32_External_Ehdr; |
| 69 | |
| 70 | /* 64-bit ELF file header. */ |
| 71 | |
| 72 | typedef struct { |
| 73 | unsigned char e_ident[16]; /* ELF "magic number" */ |
| 74 | unsigned char e_type[2]; /* Identifies object file type */ |
| 75 | unsigned char e_machine[2]; /* Specifies required architecture */ |
| 76 | unsigned char e_version[4]; /* Identifies object file version */ |
| 77 | unsigned char e_entry[8]; /* Entry point virtual address */ |
| 78 | unsigned char e_phoff[8]; /* Program header table file offset */ |
| 79 | unsigned char e_shoff[8]; /* Section header table file offset */ |
| 80 | unsigned char e_flags[4]; /* Processor-specific flags */ |
| 81 | unsigned char e_ehsize[2]; /* ELF header size in bytes */ |
| 82 | unsigned char e_phentsize[2]; /* Program header table entry size */ |
| 83 | unsigned char e_phnum[2]; /* Program header table entry count */ |
| 84 | unsigned char e_shentsize[2]; /* Section header table entry size */ |
| 85 | unsigned char e_shnum[2]; /* Section header table entry count */ |
| 86 | unsigned char e_shstrndx[2]; /* Section header string table index */ |
| 87 | } Elf64_External_Ehdr; |
| 88 | |
| 89 | /* Indexes and values in e_ident field of Ehdr. */ |
| 90 | |
| 91 | #define EI_MAG0 0 /* File identification byte 0 index */ |
| 92 | #define ELFMAG0 0x7F /* Magic number byte 0 */ |
| 93 | |
| 94 | #define EI_MAG1 1 /* File identification byte 1 index */ |
| 95 | #define ELFMAG1 'E' /* Magic number byte 1 */ |
| 96 | |
| 97 | #define EI_MAG2 2 /* File identification byte 2 index */ |
| 98 | #define ELFMAG2 'L' /* Magic number byte 2 */ |
| 99 | |
| 100 | #define EI_MAG3 3 /* File identification byte 3 index */ |
| 101 | #define ELFMAG3 'F' /* Magic number byte 3 */ |
| 102 | |
| 103 | #define EI_CLASS 4 /* File class */ |
| 104 | #define ELFCLASSNONE 0 /* Invalid class */ |
| 105 | #define ELFCLASS32 1 /* 32-bit objects */ |
| 106 | #define ELFCLASS64 2 /* 64-bit objects */ |
| 107 | |
| 108 | #define EI_DATA 5 /* Data encoding */ |
| 109 | #define ELFDATANONE 0 /* Invalid data encoding */ |
| 110 | #define ELFDATA2LSB 1 /* 2's complement, little endian */ |
| 111 | #define ELFDATA2MSB 2 /* 2's complement, big endian */ |
| 112 | |
| 113 | #define EI_VERSION 6 /* File version */ |
| 114 | #define EV_CURRENT 1 /* Current version */ |
| 115 | |
| 116 | #define EI_OSABI 7 /* Operating System/ABI indication */ |
| 117 | |
| 118 | /* Values for e_type field of Ehdr. */ |
| 119 | |
| 120 | #define ET_REL 1 /* Relocatable file */ |
| 121 | |
| 122 | /* Values for e_machine field of Ehdr. */ |
| 123 | |
| 124 | #define EM_SPARC 2 /* SUN SPARC */ |
| 125 | #define EM_SPARC32PLUS 18 /* Sun's "v8plus" */ |
| 126 | |
| 127 | /* Special section index values. */ |
| 128 | |
| 129 | #define SHN_UNDEF 0 /* Undefined section */ |
| 130 | #define SHN_LORESERVE 0xFF00 /* Begin range of reserved indices */ |
| 131 | #define SHN_COMMON 0xFFF2 /* Associated symbol is in common */ |
| 132 | #define SHN_XINDEX 0xFFFF /* Section index is held elsewhere */ |
| 133 | #define SHN_HIRESERVE 0xffff /* End of reserved indices */ |
| 134 | |
| 135 | |
| 136 | /* 32-bit ELF program header. */ |
| 137 | |
| 138 | typedef struct { |
| 139 | unsigned char p_type[4]; /* Identifies program segment type */ |
| 140 | unsigned char p_offset[4]; /* Segment file offset */ |
| 141 | unsigned char p_vaddr[4]; /* Segment virtual address */ |
| 142 | unsigned char p_paddr[4]; /* Segment physical address */ |
| 143 | unsigned char p_filesz[4]; /* Segment size in file */ |
| 144 | unsigned char p_memsz[4]; /* Segment size in memory */ |
| 145 | unsigned char p_flags[4]; /* Segment flags */ |
| 146 | unsigned char p_align[4]; /* Segment alignment, file & memory */ |
| 147 | } Elf32_External_Phdr; |
| 148 | |
| 149 | /* 64-bit ELF program header. */ |
| 150 | |
| 151 | typedef struct { |
| 152 | unsigned char p_type[4]; /* Identifies program segment type */ |
| 153 | unsigned char p_flags[4]; /* Segment flags */ |
| 154 | unsigned char p_offset[8]; /* Segment file offset */ |
| 155 | unsigned char p_vaddr[8]; /* Segment virtual address */ |
| 156 | unsigned char p_paddr[8]; /* Segment physical address */ |
| 157 | unsigned char p_filesz[8]; /* Segment size in file */ |
| 158 | unsigned char p_memsz[8]; /* Segment size in memory */ |
| 159 | unsigned char p_align[8]; /* Segment alignment, file & memory */ |
| 160 | } Elf64_External_Phdr; |
| 161 | |
| 162 | /* 32-bit ELF section header */ |
| 163 | |
| 164 | typedef struct { |
| 165 | unsigned char sh_name[4]; /* Section name, index in string tbl */ |
| 166 | unsigned char sh_type[4]; /* Type of section */ |
| 167 | unsigned char sh_flags[4]; /* Miscellaneous section attributes */ |
| 168 | unsigned char sh_addr[4]; /* Section virtual addr at execution */ |
| 169 | unsigned char sh_offset[4]; /* Section file offset */ |
| 170 | unsigned char sh_size[4]; /* Size of section in bytes */ |
| 171 | unsigned char sh_link[4]; /* Index of another section */ |
| 172 | unsigned char sh_info[4]; /* Additional section information */ |
| 173 | unsigned char sh_addralign[4]; /* Section alignment */ |
| 174 | unsigned char sh_entsize[4]; /* Entry size if section holds table */ |
| 175 | } Elf32_External_Shdr; |
| 176 | |
| 177 | /* 64-bit ELF section header. */ |
| 178 | |
| 179 | typedef struct { |
| 180 | unsigned char sh_name[4]; /* Section name, index in string tbl */ |
| 181 | unsigned char sh_type[4]; /* Type of section */ |
| 182 | unsigned char sh_flags[8]; /* Miscellaneous section attributes */ |
| 183 | unsigned char sh_addr[8]; /* Section virtual addr at execution */ |
| 184 | unsigned char sh_offset[8]; /* Section file offset */ |
| 185 | unsigned char sh_size[8]; /* Size of section in bytes */ |
| 186 | unsigned char sh_link[4]; /* Index of another section */ |
| 187 | unsigned char sh_info[4]; /* Additional section information */ |
| 188 | unsigned char sh_addralign[8]; /* Section alignment */ |
| 189 | unsigned char sh_entsize[8]; /* Entry size if section holds table */ |
| 190 | } Elf64_External_Shdr; |
| 191 | |
| 192 | /* Values for sh_type field. */ |
| 193 | |
| 194 | #define SHT_NULL 0 /* Section header table entry unused */ |
| 195 | #define SHT_PROGBITS 1 /* Program data */ |
| 196 | #define SHT_SYMTAB 2 /* Link editing symbol table */ |
| 197 | #define SHT_STRTAB 3 /* A string table */ |
| 198 | #define SHT_RELA 4 /* Relocation entries with addends */ |
| 199 | #define SHT_REL 9 /* Relocation entries, no addends */ |
| 200 | #define SHT_GROUP 17 /* Section contains a section group */ |
| 201 | #define SHT_SYMTAB_SHNDX 18 /* Extended section indeces */ |
| 202 | |
| 203 | /* Values for sh_flags field. */ |
| 204 | |
| 205 | #define SHF_INFO_LINK 0x00000040 /* `sh_info' contains SHT index */ |
| 206 | #define SHF_EXECINSTR 0x00000004 /* Executable section. */ |
| 207 | #define SHF_EXCLUDE 0x80000000 /* Link editor is to exclude this |
| 208 | section from executable and |
| 209 | shared library that it builds |
| 210 | when those objects are not to be |
| 211 | further relocated. */ |
| 212 | /* Symbol table entry. */ |
| 213 | |
| 214 | typedef struct |
| 215 | { |
| 216 | unsigned char st_name[4]; /* Symbol name (string tbl index) */ |
| 217 | unsigned char st_value[4]; /* Symbol value */ |
| 218 | unsigned char st_size[4]; /* Symbol size */ |
| 219 | unsigned char st_info; /* Symbol type and binding */ |
| 220 | unsigned char st_other; /* Symbol visibility */ |
| 221 | unsigned char st_shndx[2]; /* Section index */ |
| 222 | } Elf32_External_Sym; |
| 223 | |
| 224 | typedef struct |
| 225 | { |
| 226 | unsigned char st_name[4]; /* Symbol name (string tbl index) */ |
| 227 | unsigned char st_info; /* Symbol type and binding */ |
| 228 | unsigned char st_other; /* Symbol visibility */ |
| 229 | unsigned char st_shndx[2]; /* Section index */ |
| 230 | unsigned char st_value[8]; /* Symbol value */ |
| 231 | unsigned char st_size[8]; /* Symbol size */ |
| 232 | } Elf64_External_Sym; |
| 233 | |
| 234 | #define ELF_ST_BIND(val) (((unsigned char) (val)) >> 4) |
| 235 | #define ELF_ST_TYPE(val) ((val) & 0xf) |
| 236 | #define ELF_ST_INFO(bind, type) (((bind) << 4) + ((type) & 0xf)) |
| 237 | |
| 238 | #define STT_NOTYPE 0 /* Symbol type is unspecified */ |
| 239 | #define STT_OBJECT 1 /* Symbol is a data object */ |
| 240 | #define STT_FUNC 2 /* Symbol is a code object */ |
| 241 | #define STT_TLS 6 /* Thread local data object */ |
| 242 | #define STT_GNU_IFUNC 10 /* Symbol is an indirect code object */ |
| 243 | |
| 244 | #define STB_LOCAL 0 /* Local symbol */ |
| 245 | #define STB_GLOBAL 1 /* Global symbol */ |
| 246 | #define STB_WEAK 2 /* Weak global */ |
| 247 | |
| 248 | #define STV_DEFAULT 0 /* Visibility is specified by binding type */ |
| 249 | #define STV_HIDDEN 2 /* Can only be seen inside currect component */ |
| 250 | |
| 251 | /* Functions to fetch and store different ELF types, depending on the |
| 252 | endianness and size. */ |
| 253 | |
| 254 | struct elf_type_functions |
| 255 | { |
| 256 | unsigned short (*fetch_Elf_Half) (const unsigned char *); |
| 257 | unsigned int (*fetch_Elf_Word) (const unsigned char *); |
| 258 | ulong_type (*fetch_Elf_Addr) (const unsigned char *); |
| 259 | void (*set_Elf_Half) (unsigned char *, unsigned short); |
| 260 | void (*set_Elf_Word) (unsigned char *, unsigned int); |
| 261 | void (*set_Elf_Addr) (unsigned char *, ulong_type); |
| 262 | }; |
| 263 | |
| 264 | static const struct elf_type_functions elf_big_32_functions = |
| 265 | { |
| 266 | simple_object_fetch_big_16, |
| 267 | simple_object_fetch_big_32, |
| 268 | simple_object_fetch_big_32_ulong, |
| 269 | simple_object_set_big_16, |
| 270 | simple_object_set_big_32, |
| 271 | simple_object_set_big_32_ulong |
| 272 | }; |
| 273 | |
| 274 | static const struct elf_type_functions elf_little_32_functions = |
| 275 | { |
| 276 | simple_object_fetch_little_16, |
| 277 | simple_object_fetch_little_32, |
| 278 | simple_object_fetch_little_32_ulong, |
| 279 | simple_object_set_little_16, |
| 280 | simple_object_set_little_32, |
| 281 | simple_object_set_little_32_ulong |
| 282 | }; |
| 283 | |
| 284 | #ifdef UNSIGNED_64BIT_TYPE |
| 285 | |
| 286 | static const struct elf_type_functions elf_big_64_functions = |
| 287 | { |
| 288 | simple_object_fetch_big_16, |
| 289 | simple_object_fetch_big_32, |
| 290 | simple_object_fetch_big_64, |
| 291 | simple_object_set_big_16, |
| 292 | simple_object_set_big_32, |
| 293 | simple_object_set_big_64 |
| 294 | }; |
| 295 | |
| 296 | static const struct elf_type_functions elf_little_64_functions = |
| 297 | { |
| 298 | simple_object_fetch_little_16, |
| 299 | simple_object_fetch_little_32, |
| 300 | simple_object_fetch_little_64, |
| 301 | simple_object_set_little_16, |
| 302 | simple_object_set_little_32, |
| 303 | simple_object_set_little_64 |
| 304 | }; |
| 305 | |
| 306 | #endif |
| 307 | |
| 308 | /* Hideous macro to fetch the value of a field from an external ELF |
| 309 | struct of some sort. TYPEFUNCS is the set of type functions. |
| 310 | BUFFER points to the external data. STRUCTTYPE is the appropriate |
| 311 | struct type. FIELD is a field within the struct. TYPE is the type |
| 312 | of the field in the struct: Elf_Half, Elf_Word, or Elf_Addr. */ |
| 313 | |
| 314 | #define ELF_FETCH_STRUCT_FIELD(TYPEFUNCS, STRUCTTYPE, FIELD, BUFFER, TYPE) \ |
| 315 | ((TYPEFUNCS)->fetch_ ## TYPE ((BUFFER) + offsetof (STRUCTTYPE, FIELD))) |
| 316 | |
| 317 | /* Even more hideous macro to fetch the value of FIELD from BUFFER. |
| 318 | SIZE is 32 or 64. STRUCTTYPE is the name of the struct from |
| 319 | elf/external.h: Ehdr, Shdr, etc. FIELD is the name of a field in |
| 320 | the struct. TYPE is the type of the field in the struct: Elf_Half, |
| 321 | Elf_Word, or Elf_Addr. */ |
| 322 | |
| 323 | #define ELF_FETCH_SIZED_FIELD(TYPEFUNCS, SIZE, STRUCTTYPE, BUFFER, \ |
| 324 | FIELD, TYPE) \ |
| 325 | ELF_FETCH_STRUCT_FIELD (TYPEFUNCS, \ |
| 326 | Elf ## SIZE ## _External_ ## STRUCTTYPE, \ |
| 327 | FIELD, BUFFER, TYPE) |
| 328 | |
| 329 | /* Like ELF_FETCH_SIZED_FIELD but taking an ELFCLASS value. */ |
| 330 | |
| 331 | #define ELF_FETCH_FIELD(TYPEFUNCS, CLASS, STRUCTTYPE, BUFFER, \ |
| 332 | FIELD, TYPE) \ |
| 333 | ((CLASS) == ELFCLASS32 \ |
| 334 | ? ELF_FETCH_SIZED_FIELD (TYPEFUNCS, 32, STRUCTTYPE, BUFFER, FIELD, \ |
| 335 | TYPE) \ |
| 336 | : ELF_FETCH_SIZED_FIELD (TYPEFUNCS, 64, STRUCTTYPE, BUFFER, FIELD, \ |
| 337 | TYPE)) |
| 338 | |
| 339 | /* Hideous macro to set the value of a field in an external ELF |
| 340 | structure to VAL. TYPEFUNCS is the set of type functions. BUFFER |
| 341 | points to the external data. STRUCTTYPE is the appropriate |
| 342 | structure type. FIELD is a field within the struct. TYPE is the |
| 343 | type of the field in the struct: Elf_Half, Elf_Word, or |
| 344 | Elf_Addr. */ |
| 345 | |
| 346 | #define ELF_SET_STRUCT_FIELD(TYPEFUNCS, STRUCTTYPE, FIELD, BUFFER, TYPE, VAL) \ |
| 347 | (TYPEFUNCS)->set_ ## TYPE ((BUFFER) + offsetof (STRUCTTYPE, FIELD), (VAL)) |
| 348 | |
| 349 | /* Even more hideous macro to set the value of FIELD in BUFFER to VAL. |
| 350 | SIZE is 32 or 64. STRUCTTYPE is the name of the struct from |
| 351 | elf/external.h: Ehdr, Shdr, etc. FIELD is the name of a field in |
| 352 | the struct. TYPE is the type of the field in the struct: Elf_Half, |
| 353 | Elf_Word, or Elf_Addr. */ |
| 354 | |
| 355 | #define ELF_SET_SIZED_FIELD(TYPEFUNCS, SIZE, STRUCTTYPE, BUFFER, FIELD, \ |
| 356 | TYPE, VAL) \ |
| 357 | ELF_SET_STRUCT_FIELD (TYPEFUNCS, \ |
| 358 | Elf ## SIZE ## _External_ ## STRUCTTYPE, \ |
| 359 | FIELD, BUFFER, TYPE, VAL) |
| 360 | |
| 361 | /* Like ELF_SET_SIZED_FIELD but taking an ELFCLASS value. */ |
| 362 | |
| 363 | #define ELF_SET_FIELD(TYPEFUNCS, CLASS, STRUCTTYPE, BUFFER, FIELD, \ |
| 364 | TYPE, VAL) \ |
| 365 | ((CLASS) == ELFCLASS32 \ |
| 366 | ? ELF_SET_SIZED_FIELD (TYPEFUNCS, 32, STRUCTTYPE, BUFFER, FIELD, \ |
| 367 | TYPE, VAL) \ |
| 368 | : ELF_SET_SIZED_FIELD (TYPEFUNCS, 64, STRUCTTYPE, BUFFER, FIELD, \ |
| 369 | TYPE, VAL)) |
| 370 | |
| 371 | /* Private data for an simple_object_read. */ |
| 372 | |
| 373 | struct simple_object_elf_read |
| 374 | { |
| 375 | /* Type functions. */ |
| 376 | const struct elf_type_functions* type_functions; |
| 377 | /* Elf data. */ |
| 378 | unsigned char ei_data; |
| 379 | /* Elf class. */ |
| 380 | unsigned char ei_class; |
| 381 | /* ELF OS ABI. */ |
| 382 | unsigned char ei_osabi; |
| 383 | /* Elf machine number. */ |
| 384 | unsigned short machine; |
| 385 | /* Processor specific flags. */ |
| 386 | unsigned int flags; |
| 387 | /* File offset of section headers. */ |
| 388 | ulong_type shoff; |
| 389 | /* Number of sections. */ |
| 390 | unsigned int shnum; |
| 391 | /* Index of string table section header. */ |
| 392 | unsigned int shstrndx; |
| 393 | }; |
| 394 | |
| 395 | /* Private data for an simple_object_attributes. */ |
| 396 | |
| 397 | struct simple_object_elf_attributes |
| 398 | { |
| 399 | /* Type functions. */ |
| 400 | const struct elf_type_functions* type_functions; |
| 401 | /* Elf data. */ |
| 402 | unsigned char ei_data; |
| 403 | /* Elf class. */ |
| 404 | unsigned char ei_class; |
| 405 | /* ELF OS ABI. */ |
| 406 | unsigned char ei_osabi; |
| 407 | /* Elf machine number. */ |
| 408 | unsigned short machine; |
| 409 | /* Processor specific flags. */ |
| 410 | unsigned int flags; |
| 411 | }; |
| 412 | |
| 413 | /* Private data for an simple_object_write. */ |
| 414 | |
| 415 | struct simple_object_elf_write |
| 416 | { |
| 417 | struct simple_object_elf_attributes attrs; |
| 418 | unsigned char *shdrs; |
| 419 | }; |
| 420 | |
| 421 | /* See if we have an ELF file. */ |
| 422 | |
| 423 | static void * |
| 424 | simple_object_elf_match (unsigned char header[SIMPLE_OBJECT_MATCH_HEADER_LEN], |
| 425 | int descriptor, off_t offset, |
| 426 | const char *segment_name ATTRIBUTE_UNUSED, |
| 427 | const char **errmsg, int *err) |
| 428 | { |
| 429 | unsigned char ei_data; |
| 430 | unsigned char ei_class; |
| 431 | const struct elf_type_functions *type_functions; |
| 432 | unsigned char ehdr[sizeof (Elf64_External_Ehdr)]; |
| 433 | struct simple_object_elf_read *eor; |
| 434 | |
| 435 | if (header[EI_MAG0] != ELFMAG0 |
| 436 | || header[EI_MAG1] != ELFMAG1 |
| 437 | || header[EI_MAG2] != ELFMAG2 |
| 438 | || header[EI_MAG3] != ELFMAG3 |
| 439 | || header[EI_VERSION] != EV_CURRENT) |
| 440 | { |
| 441 | *errmsg = NULL; |
| 442 | *err = 0; |
| 443 | return NULL; |
| 444 | } |
| 445 | |
| 446 | ei_data = header[EI_DATA]; |
| 447 | if (ei_data != ELFDATA2LSB && ei_data != ELFDATA2MSB) |
| 448 | { |
| 449 | *errmsg = "unknown ELF endianness"; |
| 450 | *err = 0; |
| 451 | return NULL; |
| 452 | } |
| 453 | |
| 454 | ei_class = header[EI_CLASS]; |
| 455 | switch (ei_class) |
| 456 | { |
| 457 | case ELFCLASS32: |
| 458 | type_functions = (ei_data == ELFDATA2LSB |
| 459 | ? &elf_little_32_functions |
| 460 | : &elf_big_32_functions); |
| 461 | break; |
| 462 | |
| 463 | case ELFCLASS64: |
| 464 | #ifndef UNSIGNED_64BIT_TYPE |
| 465 | *errmsg = "64-bit ELF objects not supported"; |
| 466 | *err = 0; |
| 467 | return NULL; |
| 468 | #else |
| 469 | type_functions = (ei_data == ELFDATA2LSB |
| 470 | ? &elf_little_64_functions |
| 471 | : &elf_big_64_functions); |
| 472 | break; |
| 473 | #endif |
| 474 | |
| 475 | default: |
| 476 | *errmsg = "unrecognized ELF size"; |
| 477 | *err = 0; |
| 478 | return NULL; |
| 479 | } |
| 480 | |
| 481 | if (!simple_object_internal_read (descriptor, offset, ehdr, sizeof ehdr, |
| 482 | errmsg, err)) |
| 483 | return NULL; |
| 484 | |
| 485 | eor = XNEW (struct simple_object_elf_read); |
| 486 | eor->type_functions = type_functions; |
| 487 | eor->ei_data = ei_data; |
| 488 | eor->ei_class = ei_class; |
| 489 | eor->ei_osabi = header[EI_OSABI]; |
| 490 | eor->machine = ELF_FETCH_FIELD (type_functions, ei_class, Ehdr, ehdr, |
| 491 | e_machine, Elf_Half); |
| 492 | eor->flags = ELF_FETCH_FIELD (type_functions, ei_class, Ehdr, ehdr, |
| 493 | e_flags, Elf_Word); |
| 494 | eor->shoff = ELF_FETCH_FIELD (type_functions, ei_class, Ehdr, ehdr, |
| 495 | e_shoff, Elf_Addr); |
| 496 | eor->shnum = ELF_FETCH_FIELD (type_functions, ei_class, Ehdr, ehdr, |
| 497 | e_shnum, Elf_Half); |
| 498 | eor->shstrndx = ELF_FETCH_FIELD (type_functions, ei_class, Ehdr, ehdr, |
| 499 | e_shstrndx, Elf_Half); |
| 500 | |
| 501 | if ((eor->shnum == 0 || eor->shstrndx == SHN_XINDEX) |
| 502 | && eor->shoff != 0) |
| 503 | { |
| 504 | unsigned char shdr[sizeof (Elf64_External_Shdr)]; |
| 505 | |
| 506 | /* Object file has more than 0xffff sections. */ |
| 507 | |
| 508 | if (!simple_object_internal_read (descriptor, offset + eor->shoff, shdr, |
| 509 | (ei_class == ELFCLASS32 |
| 510 | ? sizeof (Elf32_External_Shdr) |
| 511 | : sizeof (Elf64_External_Shdr)), |
| 512 | errmsg, err)) |
| 513 | { |
| 514 | XDELETE (eor); |
| 515 | return NULL; |
| 516 | } |
| 517 | |
| 518 | if (eor->shnum == 0) |
| 519 | eor->shnum = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, |
| 520 | shdr, sh_size, Elf_Addr); |
| 521 | |
| 522 | if (eor->shstrndx == SHN_XINDEX) |
| 523 | { |
| 524 | eor->shstrndx = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, |
| 525 | shdr, sh_link, Elf_Word); |
| 526 | |
| 527 | /* Versions of the GNU binutils between 2.12 and 2.18 did |
| 528 | not handle objects with more than SHN_LORESERVE sections |
| 529 | correctly. All large section indexes were offset by |
| 530 | 0x100. There is more information at |
| 531 | http://sourceware.org/bugzilla/show_bug.cgi?id-5900 . |
| 532 | Fortunately these object files are easy to detect, as the |
| 533 | GNU binutils always put the section header string table |
| 534 | near the end of the list of sections. Thus if the |
| 535 | section header string table index is larger than the |
| 536 | number of sections, then we know we have to subtract |
| 537 | 0x100 to get the real section index. */ |
| 538 | if (eor->shstrndx >= eor->shnum |
| 539 | && eor->shstrndx >= SHN_LORESERVE + 0x100) |
| 540 | eor->shstrndx -= 0x100; |
| 541 | } |
| 542 | } |
| 543 | |
| 544 | if (eor->shstrndx >= eor->shnum) |
| 545 | { |
| 546 | *errmsg = "invalid ELF shstrndx >= shnum"; |
| 547 | *err = 0; |
| 548 | XDELETE (eor); |
| 549 | return NULL; |
| 550 | } |
| 551 | |
| 552 | if (eor->shstrndx == 0) |
| 553 | { |
| 554 | *errmsg = "invalid ELF shstrndx == 0"; |
| 555 | *err = 0; |
| 556 | XDELETE (eor); |
| 557 | return NULL; |
| 558 | } |
| 559 | |
| 560 | return (void *) eor; |
| 561 | } |
| 562 | |
| 563 | /* Find all sections in an ELF file. */ |
| 564 | |
| 565 | static const char * |
| 566 | simple_object_elf_find_sections (simple_object_read *sobj, |
| 567 | int (*pfn) (void *, const char *, |
| 568 | off_t offset, off_t length), |
| 569 | void *data, |
| 570 | int *err) |
| 571 | { |
| 572 | struct simple_object_elf_read *eor = |
| 573 | (struct simple_object_elf_read *) sobj->data; |
| 574 | const struct elf_type_functions *type_functions = eor->type_functions; |
| 575 | unsigned char ei_class = eor->ei_class; |
| 576 | size_t shdr_size; |
| 577 | unsigned int shnum; |
| 578 | unsigned char *shdrs; |
| 579 | const char *errmsg; |
| 580 | unsigned char *shstrhdr; |
| 581 | size_t name_size; |
| 582 | off_t shstroff; |
| 583 | unsigned char *names; |
| 584 | unsigned int i; |
| 585 | |
| 586 | shdr_size = (ei_class == ELFCLASS32 |
| 587 | ? sizeof (Elf32_External_Shdr) |
| 588 | : sizeof (Elf64_External_Shdr)); |
| 589 | |
| 590 | /* Read the section headers. We skip section 0, which is not a |
| 591 | useful section. */ |
| 592 | |
| 593 | shnum = eor->shnum; |
| 594 | shdrs = XNEWVEC (unsigned char, shdr_size * (shnum - 1)); |
| 595 | |
| 596 | if (!simple_object_internal_read (sobj->descriptor, |
| 597 | sobj->offset + eor->shoff + shdr_size, |
| 598 | shdrs, |
| 599 | shdr_size * (shnum - 1), |
| 600 | &errmsg, err)) |
| 601 | { |
| 602 | XDELETEVEC (shdrs); |
| 603 | return errmsg; |
| 604 | } |
| 605 | |
| 606 | /* Read the section names. */ |
| 607 | |
| 608 | shstrhdr = shdrs + (eor->shstrndx - 1) * shdr_size; |
| 609 | name_size = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, |
| 610 | shstrhdr, sh_size, Elf_Addr); |
| 611 | shstroff = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, |
| 612 | shstrhdr, sh_offset, Elf_Addr); |
| 613 | names = XNEWVEC (unsigned char, name_size); |
| 614 | if (!simple_object_internal_read (sobj->descriptor, |
| 615 | sobj->offset + shstroff, |
| 616 | names, name_size, &errmsg, err)) |
| 617 | { |
| 618 | XDELETEVEC (names); |
| 619 | XDELETEVEC (shdrs); |
| 620 | return errmsg; |
| 621 | } |
| 622 | |
| 623 | for (i = 1; i < shnum; ++i) |
| 624 | { |
| 625 | unsigned char *shdr; |
| 626 | unsigned int sh_name; |
| 627 | const char *name; |
| 628 | off_t offset; |
| 629 | off_t length; |
| 630 | |
| 631 | shdr = shdrs + (i - 1) * shdr_size; |
| 632 | sh_name = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, |
| 633 | shdr, sh_name, Elf_Word); |
| 634 | if (sh_name >= name_size) |
| 635 | { |
| 636 | *err = 0; |
| 637 | XDELETEVEC (names); |
| 638 | XDELETEVEC (shdrs); |
| 639 | return "ELF section name out of range"; |
| 640 | } |
| 641 | |
| 642 | name = (const char *) names + sh_name; |
| 643 | offset = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, |
| 644 | shdr, sh_offset, Elf_Addr); |
| 645 | length = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, |
| 646 | shdr, sh_size, Elf_Addr); |
| 647 | |
| 648 | if (!(*pfn) (data, name, offset, length)) |
| 649 | break; |
| 650 | } |
| 651 | |
| 652 | XDELETEVEC (names); |
| 653 | XDELETEVEC (shdrs); |
| 654 | |
| 655 | return NULL; |
| 656 | } |
| 657 | |
| 658 | /* Fetch the attributes for an simple_object_read. */ |
| 659 | |
| 660 | static void * |
| 661 | simple_object_elf_fetch_attributes (simple_object_read *sobj, |
| 662 | const char **errmsg ATTRIBUTE_UNUSED, |
| 663 | int *err ATTRIBUTE_UNUSED) |
| 664 | { |
| 665 | struct simple_object_elf_read *eor = |
| 666 | (struct simple_object_elf_read *) sobj->data; |
| 667 | struct simple_object_elf_attributes *ret; |
| 668 | |
| 669 | ret = XNEW (struct simple_object_elf_attributes); |
| 670 | ret->type_functions = eor->type_functions; |
| 671 | ret->ei_data = eor->ei_data; |
| 672 | ret->ei_class = eor->ei_class; |
| 673 | ret->ei_osabi = eor->ei_osabi; |
| 674 | ret->machine = eor->machine; |
| 675 | ret->flags = eor->flags; |
| 676 | return ret; |
| 677 | } |
| 678 | |
| 679 | /* Release the privata data for an simple_object_read. */ |
| 680 | |
| 681 | static void |
| 682 | simple_object_elf_release_read (void *data) |
| 683 | { |
| 684 | XDELETE (data); |
| 685 | } |
| 686 | |
| 687 | /* Compare two attributes structures. */ |
| 688 | |
| 689 | static const char * |
| 690 | simple_object_elf_attributes_merge (void *todata, void *fromdata, int *err) |
| 691 | { |
| 692 | struct simple_object_elf_attributes *to = |
| 693 | (struct simple_object_elf_attributes *) todata; |
| 694 | struct simple_object_elf_attributes *from = |
| 695 | (struct simple_object_elf_attributes *) fromdata; |
| 696 | |
| 697 | if (to->ei_data != from->ei_data || to->ei_class != from->ei_class) |
| 698 | { |
| 699 | *err = 0; |
| 700 | return "ELF object format mismatch"; |
| 701 | } |
| 702 | |
| 703 | if (to->machine != from->machine) |
| 704 | { |
| 705 | int ok; |
| 706 | |
| 707 | /* EM_SPARC and EM_SPARC32PLUS are compatible and force an |
| 708 | output of EM_SPARC32PLUS. */ |
| 709 | ok = 0; |
| 710 | switch (to->machine) |
| 711 | { |
| 712 | case EM_SPARC: |
| 713 | if (from->machine == EM_SPARC32PLUS) |
| 714 | { |
| 715 | to->machine = from->machine; |
| 716 | ok = 1; |
| 717 | } |
| 718 | break; |
| 719 | |
| 720 | case EM_SPARC32PLUS: |
| 721 | if (from->machine == EM_SPARC) |
| 722 | ok = 1; |
| 723 | break; |
| 724 | |
| 725 | default: |
| 726 | break; |
| 727 | } |
| 728 | |
| 729 | if (!ok) |
| 730 | { |
| 731 | *err = 0; |
| 732 | return "ELF machine number mismatch"; |
| 733 | } |
| 734 | } |
| 735 | |
| 736 | return NULL; |
| 737 | } |
| 738 | |
| 739 | /* Release the private data for an attributes structure. */ |
| 740 | |
| 741 | static void |
| 742 | simple_object_elf_release_attributes (void *data) |
| 743 | { |
| 744 | XDELETE (data); |
| 745 | } |
| 746 | |
| 747 | /* Prepare to write out a file. */ |
| 748 | |
| 749 | static void * |
| 750 | simple_object_elf_start_write (void *attributes_data, |
| 751 | const char **errmsg ATTRIBUTE_UNUSED, |
| 752 | int *err ATTRIBUTE_UNUSED) |
| 753 | { |
| 754 | struct simple_object_elf_attributes *attrs = |
| 755 | (struct simple_object_elf_attributes *) attributes_data; |
| 756 | struct simple_object_elf_write *ret; |
| 757 | |
| 758 | /* We're just going to record the attributes, but we need to make a |
| 759 | copy because the user may delete them. */ |
| 760 | ret = XNEW (struct simple_object_elf_write); |
| 761 | ret->attrs = *attrs; |
| 762 | ret->shdrs = NULL; |
| 763 | return ret; |
| 764 | } |
| 765 | |
| 766 | /* Write out an ELF ehdr. */ |
| 767 | |
| 768 | static int |
| 769 | simple_object_elf_write_ehdr (simple_object_write *sobj, int descriptor, |
| 770 | const char **errmsg, int *err) |
| 771 | { |
| 772 | struct simple_object_elf_attributes *attrs = |
| 773 | (struct simple_object_elf_attributes *) sobj->data; |
| 774 | const struct elf_type_functions* fns; |
| 775 | unsigned char cl; |
| 776 | size_t ehdr_size; |
| 777 | unsigned char buf[sizeof (Elf64_External_Ehdr)]; |
| 778 | simple_object_write_section *section; |
| 779 | unsigned int shnum; |
| 780 | unsigned int shstrndx; |
| 781 | |
| 782 | fns = attrs->type_functions; |
| 783 | cl = attrs->ei_class; |
| 784 | |
| 785 | shnum = 0; |
| 786 | for (section = sobj->sections; section != NULL; section = section->next) |
| 787 | ++shnum; |
| 788 | if (shnum > 0) |
| 789 | { |
| 790 | /* Add a section header for the dummy section and one for |
| 791 | .shstrtab. */ |
| 792 | shnum += 2; |
| 793 | } |
| 794 | |
| 795 | ehdr_size = (cl == ELFCLASS32 |
| 796 | ? sizeof (Elf32_External_Ehdr) |
| 797 | : sizeof (Elf64_External_Ehdr)); |
| 798 | memset (buf, 0, sizeof (Elf64_External_Ehdr)); |
| 799 | |
| 800 | buf[EI_MAG0] = ELFMAG0; |
| 801 | buf[EI_MAG1] = ELFMAG1; |
| 802 | buf[EI_MAG2] = ELFMAG2; |
| 803 | buf[EI_MAG3] = ELFMAG3; |
| 804 | buf[EI_CLASS] = cl; |
| 805 | buf[EI_DATA] = attrs->ei_data; |
| 806 | buf[EI_VERSION] = EV_CURRENT; |
| 807 | buf[EI_OSABI] = attrs->ei_osabi; |
| 808 | |
| 809 | ELF_SET_FIELD (fns, cl, Ehdr, buf, e_type, Elf_Half, ET_REL); |
| 810 | ELF_SET_FIELD (fns, cl, Ehdr, buf, e_machine, Elf_Half, attrs->machine); |
| 811 | ELF_SET_FIELD (fns, cl, Ehdr, buf, e_version, Elf_Word, EV_CURRENT); |
| 812 | /* e_entry left as zero. */ |
| 813 | /* e_phoff left as zero. */ |
| 814 | ELF_SET_FIELD (fns, cl, Ehdr, buf, e_shoff, Elf_Addr, ehdr_size); |
| 815 | ELF_SET_FIELD (fns, cl, Ehdr, buf, e_flags, Elf_Word, attrs->flags); |
| 816 | ELF_SET_FIELD (fns, cl, Ehdr, buf, e_ehsize, Elf_Half, ehdr_size); |
| 817 | ELF_SET_FIELD (fns, cl, Ehdr, buf, e_phentsize, Elf_Half, |
| 818 | (cl == ELFCLASS32 |
| 819 | ? sizeof (Elf32_External_Phdr) |
| 820 | : sizeof (Elf64_External_Phdr))); |
| 821 | /* e_phnum left as zero. */ |
| 822 | ELF_SET_FIELD (fns, cl, Ehdr, buf, e_shentsize, Elf_Half, |
| 823 | (cl == ELFCLASS32 |
| 824 | ? sizeof (Elf32_External_Shdr) |
| 825 | : sizeof (Elf64_External_Shdr))); |
| 826 | ELF_SET_FIELD (fns, cl, Ehdr, buf, e_shnum, Elf_Half, |
| 827 | shnum >= SHN_LORESERVE ? 0 : shnum); |
| 828 | if (shnum == 0) |
| 829 | shstrndx = 0; |
| 830 | else |
| 831 | { |
| 832 | shstrndx = shnum - 1; |
| 833 | if (shstrndx >= SHN_LORESERVE) |
| 834 | shstrndx = SHN_XINDEX; |
| 835 | } |
| 836 | ELF_SET_FIELD (fns, cl, Ehdr, buf, e_shstrndx, Elf_Half, shstrndx); |
| 837 | |
| 838 | return simple_object_internal_write (descriptor, 0, buf, ehdr_size, |
| 839 | errmsg, err); |
| 840 | } |
| 841 | |
| 842 | /* Write out an ELF shdr. */ |
| 843 | |
| 844 | static int |
| 845 | simple_object_elf_write_shdr (simple_object_write *sobj, int descriptor, |
| 846 | off_t offset, unsigned int sh_name, |
| 847 | unsigned int sh_type, unsigned int sh_flags, |
| 848 | off_t sh_addr, |
| 849 | unsigned int sh_offset, unsigned int sh_size, |
| 850 | unsigned int sh_link, unsigned int sh_info, |
| 851 | size_t sh_addralign, |
| 852 | size_t sh_entsize, |
| 853 | const char **errmsg, int *err) |
| 854 | { |
| 855 | struct simple_object_elf_attributes *attrs = |
| 856 | (struct simple_object_elf_attributes *) sobj->data; |
| 857 | const struct elf_type_functions* fns; |
| 858 | unsigned char cl; |
| 859 | size_t shdr_size; |
| 860 | unsigned char buf[sizeof (Elf64_External_Shdr)]; |
| 861 | |
| 862 | fns = attrs->type_functions; |
| 863 | cl = attrs->ei_class; |
| 864 | |
| 865 | shdr_size = (cl == ELFCLASS32 |
| 866 | ? sizeof (Elf32_External_Shdr) |
| 867 | : sizeof (Elf64_External_Shdr)); |
| 868 | memset (buf, 0, sizeof (Elf64_External_Shdr)); |
| 869 | |
| 870 | ELF_SET_FIELD (fns, cl, Shdr, buf, sh_name, Elf_Word, sh_name); |
| 871 | ELF_SET_FIELD (fns, cl, Shdr, buf, sh_type, Elf_Word, sh_type); |
| 872 | ELF_SET_FIELD (fns, cl, Shdr, buf, sh_flags, Elf_Addr, sh_flags); |
| 873 | ELF_SET_FIELD (fns, cl, Shdr, buf, sh_addr, Elf_Addr, sh_addr); |
| 874 | ELF_SET_FIELD (fns, cl, Shdr, buf, sh_offset, Elf_Addr, sh_offset); |
| 875 | ELF_SET_FIELD (fns, cl, Shdr, buf, sh_size, Elf_Addr, sh_size); |
| 876 | ELF_SET_FIELD (fns, cl, Shdr, buf, sh_link, Elf_Word, sh_link); |
| 877 | ELF_SET_FIELD (fns, cl, Shdr, buf, sh_info, Elf_Word, sh_info); |
| 878 | ELF_SET_FIELD (fns, cl, Shdr, buf, sh_addralign, Elf_Addr, sh_addralign); |
| 879 | ELF_SET_FIELD (fns, cl, Shdr, buf, sh_entsize, Elf_Addr, sh_entsize); |
| 880 | |
| 881 | return simple_object_internal_write (descriptor, offset, buf, shdr_size, |
| 882 | errmsg, err); |
| 883 | } |
| 884 | |
| 885 | /* Write out a complete ELF file. |
| 886 | Ehdr |
| 887 | initial dummy Shdr |
| 888 | user-created Shdrs |
| 889 | .shstrtab Shdr |
| 890 | user-created section data |
| 891 | .shstrtab data */ |
| 892 | |
| 893 | static const char * |
| 894 | simple_object_elf_write_to_file (simple_object_write *sobj, int descriptor, |
| 895 | int *err) |
| 896 | { |
| 897 | struct simple_object_elf_write *eow = |
| 898 | (struct simple_object_elf_write *) sobj->data; |
| 899 | struct simple_object_elf_attributes *attrs = &eow->attrs; |
| 900 | unsigned char cl; |
| 901 | size_t ehdr_size; |
| 902 | size_t shdr_size; |
| 903 | const char *errmsg; |
| 904 | simple_object_write_section *section; |
| 905 | unsigned int shnum; |
| 906 | size_t shdr_offset; |
| 907 | size_t sh_offset; |
| 908 | unsigned int first_sh_size; |
| 909 | unsigned int first_sh_link; |
| 910 | size_t sh_name; |
| 911 | unsigned char zero; |
| 912 | unsigned secnum; |
| 913 | |
| 914 | if (!simple_object_elf_write_ehdr (sobj, descriptor, &errmsg, err)) |
| 915 | return errmsg; |
| 916 | |
| 917 | cl = attrs->ei_class; |
| 918 | if (cl == ELFCLASS32) |
| 919 | { |
| 920 | ehdr_size = sizeof (Elf32_External_Ehdr); |
| 921 | shdr_size = sizeof (Elf32_External_Shdr); |
| 922 | } |
| 923 | else |
| 924 | { |
| 925 | ehdr_size = sizeof (Elf64_External_Ehdr); |
| 926 | shdr_size = sizeof (Elf64_External_Shdr); |
| 927 | } |
| 928 | |
| 929 | shnum = 0; |
| 930 | for (section = sobj->sections; section != NULL; section = section->next) |
| 931 | ++shnum; |
| 932 | if (shnum == 0) |
| 933 | return NULL; |
| 934 | |
| 935 | /* Add initial dummy Shdr and .shstrtab. */ |
| 936 | shnum += 2; |
| 937 | |
| 938 | shdr_offset = ehdr_size; |
| 939 | sh_offset = shdr_offset + shnum * shdr_size; |
| 940 | |
| 941 | if (shnum < SHN_LORESERVE) |
| 942 | first_sh_size = 0; |
| 943 | else |
| 944 | first_sh_size = shnum; |
| 945 | if (shnum - 1 < SHN_LORESERVE) |
| 946 | first_sh_link = 0; |
| 947 | else |
| 948 | first_sh_link = shnum - 1; |
| 949 | if (!simple_object_elf_write_shdr (sobj, descriptor, shdr_offset, |
| 950 | 0, 0, 0, 0, 0, first_sh_size, first_sh_link, |
| 951 | 0, 0, 0, &errmsg, err)) |
| 952 | return errmsg; |
| 953 | |
| 954 | shdr_offset += shdr_size; |
| 955 | |
| 956 | sh_name = 1; |
| 957 | secnum = 0; |
| 958 | for (section = sobj->sections; section != NULL; section = section->next) |
| 959 | { |
| 960 | size_t mask; |
| 961 | size_t new_sh_offset; |
| 962 | size_t sh_size; |
| 963 | struct simple_object_write_section_buffer *buffer; |
| 964 | unsigned int sh_type = SHT_PROGBITS; |
| 965 | unsigned int sh_flags = 0; |
| 966 | off_t sh_addr = 0; |
| 967 | unsigned int sh_link = 0; |
| 968 | unsigned int sh_info = 0; |
| 969 | size_t sh_addralign = 1U << section->align; |
| 970 | size_t sh_entsize = 0; |
| 971 | if (eow->shdrs) |
| 972 | { |
| 973 | sh_type = ELF_FETCH_FIELD (attrs->type_functions, attrs->ei_class, Shdr, |
| 974 | eow->shdrs + secnum * shdr_size, |
| 975 | sh_type, Elf_Word); |
| 976 | sh_flags = ELF_FETCH_FIELD (attrs->type_functions, attrs->ei_class, Shdr, |
| 977 | eow->shdrs + secnum * shdr_size, |
| 978 | sh_flags, Elf_Addr); |
| 979 | sh_addr = ELF_FETCH_FIELD (attrs->type_functions, attrs->ei_class, Shdr, |
| 980 | eow->shdrs + secnum * shdr_size, |
| 981 | sh_addr, Elf_Addr); |
| 982 | sh_link = ELF_FETCH_FIELD (attrs->type_functions, attrs->ei_class, Shdr, |
| 983 | eow->shdrs + secnum * shdr_size, |
| 984 | sh_link, Elf_Word); |
| 985 | sh_info = ELF_FETCH_FIELD (attrs->type_functions, attrs->ei_class, Shdr, |
| 986 | eow->shdrs + secnum * shdr_size, |
| 987 | sh_info, Elf_Word); |
| 988 | sh_addralign = ELF_FETCH_FIELD (attrs->type_functions, attrs->ei_class, Shdr, |
| 989 | eow->shdrs + secnum * shdr_size, |
| 990 | sh_addralign, Elf_Addr); |
| 991 | sh_entsize = ELF_FETCH_FIELD (attrs->type_functions, attrs->ei_class, Shdr, |
| 992 | eow->shdrs + secnum * shdr_size, |
| 993 | sh_entsize, Elf_Addr); |
| 994 | secnum++; |
| 995 | } |
| 996 | |
| 997 | mask = sh_addralign - 1; |
| 998 | new_sh_offset = sh_offset + mask; |
| 999 | new_sh_offset &= ~ mask; |
| 1000 | while (new_sh_offset > sh_offset) |
| 1001 | { |
| 1002 | unsigned char zeroes[16]; |
| 1003 | size_t write; |
| 1004 | |
| 1005 | memset (zeroes, 0, sizeof zeroes); |
| 1006 | write = new_sh_offset - sh_offset; |
| 1007 | if (write > sizeof zeroes) |
| 1008 | write = sizeof zeroes; |
| 1009 | if (!simple_object_internal_write (descriptor, sh_offset, zeroes, |
| 1010 | write, &errmsg, err)) |
| 1011 | return errmsg; |
| 1012 | sh_offset += write; |
| 1013 | } |
| 1014 | |
| 1015 | sh_size = 0; |
| 1016 | for (buffer = section->buffers; buffer != NULL; buffer = buffer->next) |
| 1017 | { |
| 1018 | if (!simple_object_internal_write (descriptor, sh_offset + sh_size, |
| 1019 | ((const unsigned char *) |
| 1020 | buffer->buffer), |
| 1021 | buffer->size, &errmsg, err)) |
| 1022 | return errmsg; |
| 1023 | sh_size += buffer->size; |
| 1024 | } |
| 1025 | |
| 1026 | if (!simple_object_elf_write_shdr (sobj, descriptor, shdr_offset, |
| 1027 | sh_name, sh_type, sh_flags, |
| 1028 | sh_addr, sh_offset, |
| 1029 | sh_size, sh_link, sh_info, |
| 1030 | sh_addralign, sh_entsize, |
| 1031 | &errmsg, err)) |
| 1032 | return errmsg; |
| 1033 | |
| 1034 | shdr_offset += shdr_size; |
| 1035 | sh_name += strlen (section->name) + 1; |
| 1036 | sh_offset += sh_size; |
| 1037 | } |
| 1038 | |
| 1039 | if (!simple_object_elf_write_shdr (sobj, descriptor, shdr_offset, |
| 1040 | sh_name, SHT_STRTAB, 0, 0, sh_offset, |
| 1041 | sh_name + strlen (".shstrtab") + 1, 0, 0, |
| 1042 | 1, 0, &errmsg, err)) |
| 1043 | return errmsg; |
| 1044 | |
| 1045 | /* .shstrtab has a leading zero byte. */ |
| 1046 | zero = 0; |
| 1047 | if (!simple_object_internal_write (descriptor, sh_offset, &zero, 1, |
| 1048 | &errmsg, err)) |
| 1049 | return errmsg; |
| 1050 | ++sh_offset; |
| 1051 | |
| 1052 | for (section = sobj->sections; section != NULL; section = section->next) |
| 1053 | { |
| 1054 | size_t len; |
| 1055 | |
| 1056 | len = strlen (section->name) + 1; |
| 1057 | if (!simple_object_internal_write (descriptor, sh_offset, |
| 1058 | (const unsigned char *) section->name, |
| 1059 | len, &errmsg, err)) |
| 1060 | return errmsg; |
| 1061 | sh_offset += len; |
| 1062 | } |
| 1063 | |
| 1064 | if (!simple_object_internal_write (descriptor, sh_offset, |
| 1065 | (const unsigned char *) ".shstrtab", |
| 1066 | strlen (".shstrtab") + 1, &errmsg, err)) |
| 1067 | return errmsg; |
| 1068 | |
| 1069 | return NULL; |
| 1070 | } |
| 1071 | |
| 1072 | /* Release the private data for an simple_object_write structure. */ |
| 1073 | |
| 1074 | static void |
| 1075 | simple_object_elf_release_write (void *data) |
| 1076 | { |
| 1077 | struct simple_object_elf_write *eow = (struct simple_object_elf_write *) data; |
| 1078 | if (eow->shdrs) |
| 1079 | XDELETE (eow->shdrs); |
| 1080 | XDELETE (data); |
| 1081 | } |
| 1082 | |
| 1083 | /* Copy all sections in an ELF file. */ |
| 1084 | |
| 1085 | static const char * |
| 1086 | simple_object_elf_copy_lto_debug_sections (simple_object_read *sobj, |
| 1087 | simple_object_write *dobj, |
| 1088 | char *(*pfn) (const char *), |
| 1089 | int *err) |
| 1090 | { |
| 1091 | struct simple_object_elf_read *eor = |
| 1092 | (struct simple_object_elf_read *) sobj->data; |
| 1093 | const struct elf_type_functions *type_functions = eor->type_functions; |
| 1094 | struct simple_object_elf_write *eow = |
| 1095 | (struct simple_object_elf_write *) dobj->data; |
| 1096 | unsigned char ei_class = eor->ei_class; |
| 1097 | size_t shdr_size; |
| 1098 | unsigned int shnum; |
| 1099 | unsigned char *shdrs; |
| 1100 | const char *errmsg; |
| 1101 | unsigned char *shstrhdr; |
| 1102 | size_t name_size; |
| 1103 | off_t shstroff; |
| 1104 | unsigned char *names; |
| 1105 | unsigned int i; |
| 1106 | int changed; |
| 1107 | int *pfnret; |
| 1108 | const char **pfnname; |
| 1109 | unsigned new_i; |
| 1110 | unsigned *sh_map; |
| 1111 | unsigned first_shndx = 0; |
| 1112 | unsigned int *symtab_indices_shndx; |
| 1113 | |
| 1114 | shdr_size = (ei_class == ELFCLASS32 |
| 1115 | ? sizeof (Elf32_External_Shdr) |
| 1116 | : sizeof (Elf64_External_Shdr)); |
| 1117 | |
| 1118 | /* Read the section headers. We skip section 0, which is not a |
| 1119 | useful section. */ |
| 1120 | |
| 1121 | shnum = eor->shnum; |
| 1122 | shdrs = XNEWVEC (unsigned char, shdr_size * (shnum - 1)); |
| 1123 | |
| 1124 | if (!simple_object_internal_read (sobj->descriptor, |
| 1125 | sobj->offset + eor->shoff + shdr_size, |
| 1126 | shdrs, |
| 1127 | shdr_size * (shnum - 1), |
| 1128 | &errmsg, err)) |
| 1129 | { |
| 1130 | XDELETEVEC (shdrs); |
| 1131 | return errmsg; |
| 1132 | } |
| 1133 | |
| 1134 | /* Read the section names. */ |
| 1135 | |
| 1136 | shstrhdr = shdrs + (eor->shstrndx - 1) * shdr_size; |
| 1137 | name_size = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, |
| 1138 | shstrhdr, sh_size, Elf_Addr); |
| 1139 | shstroff = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, |
| 1140 | shstrhdr, sh_offset, Elf_Addr); |
| 1141 | names = XNEWVEC (unsigned char, name_size); |
| 1142 | if (!simple_object_internal_read (sobj->descriptor, |
| 1143 | sobj->offset + shstroff, |
| 1144 | names, name_size, &errmsg, err)) |
| 1145 | { |
| 1146 | XDELETEVEC (names); |
| 1147 | XDELETEVEC (shdrs); |
| 1148 | return errmsg; |
| 1149 | } |
| 1150 | |
| 1151 | pfnret = XNEWVEC (int, shnum); |
| 1152 | pfnname = XNEWVEC (const char *, shnum); |
| 1153 | |
| 1154 | /* Map of symtab to index section. */ |
| 1155 | symtab_indices_shndx = XCNEWVEC (unsigned int, shnum - 1); |
| 1156 | |
| 1157 | /* First perform the callbacks to know which sections to preserve and |
| 1158 | what name to use for those. */ |
| 1159 | for (i = 1; i < shnum; ++i) |
| 1160 | { |
| 1161 | unsigned char *shdr; |
| 1162 | unsigned int sh_name, sh_type; |
| 1163 | const char *name; |
| 1164 | char *ret; |
| 1165 | |
| 1166 | shdr = shdrs + (i - 1) * shdr_size; |
| 1167 | sh_name = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, |
| 1168 | shdr, sh_name, Elf_Word); |
| 1169 | if (sh_name >= name_size) |
| 1170 | { |
| 1171 | *err = 0; |
| 1172 | XDELETEVEC (names); |
| 1173 | XDELETEVEC (shdrs); |
| 1174 | return "ELF section name out of range"; |
| 1175 | } |
| 1176 | |
| 1177 | name = (const char *) names + sh_name; |
| 1178 | |
| 1179 | ret = (*pfn) (name); |
| 1180 | pfnret[i - 1] = ret == NULL ? -1 : 0; |
| 1181 | pfnname[i - 1] = ret == NULL ? name : ret; |
| 1182 | if (first_shndx == 0 |
| 1183 | && pfnret[i - 1] == 0) |
| 1184 | first_shndx = i; |
| 1185 | |
| 1186 | /* Remember the indexes of existing SHT_SYMTAB_SHNDX sections. */ |
| 1187 | sh_type = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, |
| 1188 | shdr, sh_type, Elf_Word); |
| 1189 | if (sh_type == SHT_SYMTAB_SHNDX) |
| 1190 | { |
| 1191 | unsigned int sh_link; |
| 1192 | sh_link = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, |
| 1193 | shdr, sh_link, Elf_Word); |
| 1194 | symtab_indices_shndx[sh_link - 1] = i; |
| 1195 | /* Always discard the extended index sections, after |
| 1196 | copying it will not be needed. This way we don't need to |
| 1197 | update it and deal with the ordering constraints of |
| 1198 | processing the existing symtab and changing the index. */ |
| 1199 | pfnret[i - 1] = -1; |
| 1200 | } |
| 1201 | } |
| 1202 | |
| 1203 | /* Mark sections as preserved that are required by to be preserved |
| 1204 | sections. */ |
| 1205 | do |
| 1206 | { |
| 1207 | changed = 0; |
| 1208 | for (i = 1; i < shnum; ++i) |
| 1209 | { |
| 1210 | unsigned char *shdr; |
| 1211 | unsigned int sh_type, sh_info, sh_link; |
| 1212 | off_t offset; |
| 1213 | off_t length; |
| 1214 | |
| 1215 | shdr = shdrs + (i - 1) * shdr_size; |
| 1216 | sh_type = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, |
| 1217 | shdr, sh_type, Elf_Word); |
| 1218 | sh_info = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, |
| 1219 | shdr, sh_info, Elf_Word); |
| 1220 | sh_link = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, |
| 1221 | shdr, sh_link, Elf_Word); |
| 1222 | if (sh_type == SHT_GROUP) |
| 1223 | { |
| 1224 | /* Mark groups containing copied sections. */ |
| 1225 | unsigned entsize = ELF_FETCH_FIELD (type_functions, ei_class, |
| 1226 | Shdr, shdr, sh_entsize, |
| 1227 | Elf_Addr); |
| 1228 | unsigned char *ent, *buf; |
| 1229 | int keep = 0; |
| 1230 | offset = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, |
| 1231 | shdr, sh_offset, Elf_Addr); |
| 1232 | length = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, |
| 1233 | shdr, sh_size, Elf_Addr); |
| 1234 | buf = XNEWVEC (unsigned char, length); |
| 1235 | if (!simple_object_internal_read (sobj->descriptor, |
| 1236 | sobj->offset + offset, buf, |
| 1237 | (size_t) length, &errmsg, err)) |
| 1238 | { |
| 1239 | XDELETEVEC (buf); |
| 1240 | XDELETEVEC (names); |
| 1241 | XDELETEVEC (shdrs); |
| 1242 | return errmsg; |
| 1243 | } |
| 1244 | for (ent = buf + entsize; ent < buf + length; ent += entsize) |
| 1245 | { |
| 1246 | unsigned sec = type_functions->fetch_Elf_Word (ent); |
| 1247 | if (pfnret[sec - 1] == 0) |
| 1248 | keep = 1; |
| 1249 | } |
| 1250 | if (keep) |
| 1251 | { |
| 1252 | changed |= (pfnret[sh_link - 1] == -1 |
| 1253 | || pfnret[i - 1] == -1); |
| 1254 | pfnret[sh_link - 1] = 0; |
| 1255 | pfnret[i - 1] = 0; |
| 1256 | } |
| 1257 | } |
| 1258 | if (sh_type == SHT_RELA |
| 1259 | || sh_type == SHT_REL) |
| 1260 | { |
| 1261 | /* Mark relocation sections and symtab of copied sections. */ |
| 1262 | if (pfnret[sh_info - 1] == 0) |
| 1263 | { |
| 1264 | changed |= (pfnret[sh_link - 1] == -1 |
| 1265 | || pfnret[i - 1] == -1); |
| 1266 | pfnret[sh_link - 1] = 0; |
| 1267 | pfnret[i - 1] = 0; |
| 1268 | } |
| 1269 | } |
| 1270 | if (sh_type == SHT_SYMTAB) |
| 1271 | { |
| 1272 | /* Mark strings sections of copied symtabs. */ |
| 1273 | if (pfnret[i - 1] == 0) |
| 1274 | { |
| 1275 | changed |= pfnret[sh_link - 1] == -1; |
| 1276 | pfnret[sh_link - 1] = 0; |
| 1277 | } |
| 1278 | } |
| 1279 | } |
| 1280 | } |
| 1281 | while (changed); |
| 1282 | |
| 1283 | /* Compute a mapping of old -> new section numbers. */ |
| 1284 | sh_map = XNEWVEC (unsigned, shnum); |
| 1285 | sh_map[0] = 0; |
| 1286 | new_i = 1; |
| 1287 | for (i = 1; i < shnum; ++i) |
| 1288 | { |
| 1289 | if (pfnret[i - 1] == -1) |
| 1290 | sh_map[i] = 0; |
| 1291 | else |
| 1292 | sh_map[i] = new_i++; |
| 1293 | } |
| 1294 | if (new_i - 1 >= SHN_LORESERVE) |
| 1295 | { |
| 1296 | *err = ENOTSUP; |
| 1297 | return "Too many copied sections"; |
| 1298 | } |
| 1299 | eow->shdrs = XNEWVEC (unsigned char, shdr_size * (new_i - 1)); |
| 1300 | |
| 1301 | /* Then perform the actual copying. */ |
| 1302 | new_i = 0; |
| 1303 | for (i = 1; i < shnum; ++i) |
| 1304 | { |
| 1305 | unsigned char *shdr; |
| 1306 | unsigned int sh_name, sh_type; |
| 1307 | const char *name; |
| 1308 | off_t offset; |
| 1309 | off_t length; |
| 1310 | simple_object_write_section *dest; |
| 1311 | off_t flags; |
| 1312 | unsigned char *buf; |
| 1313 | |
| 1314 | if (pfnret[i - 1]) |
| 1315 | continue; |
| 1316 | |
| 1317 | new_i++; |
| 1318 | shdr = shdrs + (i - 1) * shdr_size; |
| 1319 | sh_name = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, |
| 1320 | shdr, sh_name, Elf_Word); |
| 1321 | if (sh_name >= name_size) |
| 1322 | { |
| 1323 | *err = 0; |
| 1324 | XDELETEVEC (names); |
| 1325 | XDELETEVEC (shdrs); |
| 1326 | XDELETEVEC (symtab_indices_shndx); |
| 1327 | return "ELF section name out of range"; |
| 1328 | } |
| 1329 | |
| 1330 | name = pfnname[i - 1]; |
| 1331 | offset = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, |
| 1332 | shdr, sh_offset, Elf_Addr); |
| 1333 | length = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, |
| 1334 | shdr, sh_size, Elf_Addr); |
| 1335 | sh_type = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, |
| 1336 | shdr, sh_type, Elf_Word); |
| 1337 | |
| 1338 | dest = simple_object_write_create_section (dobj, pfnname[i - 1], |
| 1339 | 0, &errmsg, err); |
| 1340 | if (dest == NULL) |
| 1341 | { |
| 1342 | XDELETEVEC (names); |
| 1343 | XDELETEVEC (shdrs); |
| 1344 | XDELETEVEC (symtab_indices_shndx); |
| 1345 | return errmsg; |
| 1346 | } |
| 1347 | |
| 1348 | /* Record the SHDR of the source. */ |
| 1349 | memcpy (eow->shdrs + (new_i - 1) * shdr_size, shdr, shdr_size); |
| 1350 | shdr = eow->shdrs + (new_i - 1) * shdr_size; |
| 1351 | |
| 1352 | /* Copy the data. |
| 1353 | ??? This is quite wasteful and ideally would be delayed until |
| 1354 | write_to_file (). Thus it questions the interfacing |
| 1355 | which eventually should contain destination creation plus |
| 1356 | writing. */ |
| 1357 | buf = XNEWVEC (unsigned char, length); |
| 1358 | if (!simple_object_internal_read (sobj->descriptor, |
| 1359 | sobj->offset + offset, buf, |
| 1360 | (size_t) length, &errmsg, err)) |
| 1361 | { |
| 1362 | XDELETEVEC (buf); |
| 1363 | XDELETEVEC (names); |
| 1364 | XDELETEVEC (shdrs); |
| 1365 | XDELETEVEC (symtab_indices_shndx); |
| 1366 | return errmsg; |
| 1367 | } |
| 1368 | |
| 1369 | /* If we are processing .symtab purge __gnu_lto_slim symbol |
| 1370 | from it and any symbols in discarded sections. */ |
| 1371 | if (sh_type == SHT_SYMTAB) |
| 1372 | { |
| 1373 | unsigned entsize = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, |
| 1374 | shdr, sh_entsize, Elf_Addr); |
| 1375 | unsigned strtab = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, |
| 1376 | shdr, sh_link, Elf_Word); |
| 1377 | unsigned char *strshdr = shdrs + (strtab - 1) * shdr_size; |
| 1378 | off_t stroff = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, |
| 1379 | strshdr, sh_offset, Elf_Addr); |
| 1380 | size_t strsz = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, |
| 1381 | strshdr, sh_size, Elf_Addr); |
| 1382 | char *strings = XNEWVEC (char, strsz); |
| 1383 | char *gnu_lto = strings; |
| 1384 | unsigned char *ent; |
| 1385 | unsigned *shndx_table = NULL; |
| 1386 | simple_object_internal_read (sobj->descriptor, |
| 1387 | sobj->offset + stroff, |
| 1388 | (unsigned char *)strings, |
| 1389 | strsz, &errmsg, err); |
| 1390 | /* Find first '\0' in strings. */ |
| 1391 | gnu_lto = (char *) memchr (gnu_lto + 1, '\0', |
| 1392 | strings + strsz - gnu_lto); |
| 1393 | /* Read the section index table if present. */ |
| 1394 | if (symtab_indices_shndx[i - 1] != 0) |
| 1395 | { |
| 1396 | unsigned char *sidxhdr = shdrs + (strtab - 1) * shdr_size; |
| 1397 | off_t sidxoff = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, |
| 1398 | sidxhdr, sh_offset, Elf_Addr); |
| 1399 | size_t sidxsz = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, |
| 1400 | sidxhdr, sh_size, Elf_Addr); |
| 1401 | shndx_table = (unsigned *)XNEWVEC (char, sidxsz); |
| 1402 | simple_object_internal_read (sobj->descriptor, |
| 1403 | sobj->offset + sidxoff, |
| 1404 | (unsigned char *)shndx_table, |
| 1405 | sidxsz, &errmsg, err); |
| 1406 | } |
| 1407 | for (ent = buf; ent < buf + length; ent += entsize) |
| 1408 | { |
| 1409 | unsigned st_shndx = ELF_FETCH_FIELD (type_functions, ei_class, |
| 1410 | Sym, ent, |
| 1411 | st_shndx, Elf_Half); |
| 1412 | unsigned raw_st_shndx = st_shndx; |
| 1413 | unsigned char *st_info; |
| 1414 | unsigned char *st_other; |
| 1415 | int discard = 0; |
| 1416 | if (ei_class == ELFCLASS32) |
| 1417 | { |
| 1418 | st_info = &((Elf32_External_Sym *)ent)->st_info; |
| 1419 | st_other = &((Elf32_External_Sym *)ent)->st_other; |
| 1420 | } |
| 1421 | else |
| 1422 | { |
| 1423 | st_info = &((Elf64_External_Sym *)ent)->st_info; |
| 1424 | st_other = &((Elf64_External_Sym *)ent)->st_other; |
| 1425 | } |
| 1426 | if (st_shndx == SHN_XINDEX) |
| 1427 | st_shndx = type_functions->fetch_Elf_Word |
| 1428 | ((unsigned char *)(shndx_table + (ent - buf) / entsize)); |
| 1429 | /* Eliminate all COMMONs - this includes __gnu_lto_v1 |
| 1430 | and __gnu_lto_slim which otherwise cause endless |
| 1431 | LTO plugin invocation. */ |
| 1432 | if (st_shndx == SHN_COMMON) |
| 1433 | discard = 1; |
| 1434 | /* We also need to remove symbols refering to sections |
| 1435 | we'll eventually remove as with fat LTO objects |
| 1436 | we otherwise get duplicate symbols at final link |
| 1437 | (with GNU ld, gold is fine and ignores symbols in |
| 1438 | sections marked as EXCLUDE). ld/20513 */ |
| 1439 | else if (st_shndx != SHN_UNDEF |
| 1440 | && st_shndx < shnum |
| 1441 | && pfnret[st_shndx - 1] == -1) |
| 1442 | discard = 1; |
| 1443 | |
| 1444 | if (discard) |
| 1445 | { |
| 1446 | /* Make discarded symbols undefined and unnamed |
| 1447 | in case it is local. */ |
| 1448 | int bind = ELF_ST_BIND (*st_info); |
| 1449 | int other = STV_DEFAULT; |
| 1450 | if (bind == STB_LOCAL) |
| 1451 | { |
| 1452 | /* Make discarded local symbols unnamed and |
| 1453 | defined in the first prevailing section. */ |
| 1454 | ELF_SET_FIELD (type_functions, ei_class, Sym, |
| 1455 | ent, st_name, Elf_Word, 0); |
| 1456 | ELF_SET_FIELD (type_functions, ei_class, Sym, |
| 1457 | ent, st_shndx, Elf_Half, |
| 1458 | sh_map[first_shndx]); |
| 1459 | } |
| 1460 | else |
| 1461 | { |
| 1462 | /* Make discarded global symbols hidden weak |
| 1463 | undefined and sharing the gnu_lto_ name. */ |
| 1464 | bind = STB_WEAK; |
| 1465 | other = STV_HIDDEN; |
| 1466 | ELF_SET_FIELD (type_functions, ei_class, Sym, |
| 1467 | ent, st_name, Elf_Word, |
| 1468 | gnu_lto - strings); |
| 1469 | ELF_SET_FIELD (type_functions, ei_class, Sym, |
| 1470 | ent, st_shndx, Elf_Half, SHN_UNDEF); |
| 1471 | } |
| 1472 | *st_other = other; |
| 1473 | *st_info = ELF_ST_INFO (bind, STT_NOTYPE); |
| 1474 | ELF_SET_FIELD (type_functions, ei_class, Sym, |
| 1475 | ent, st_value, Elf_Addr, 0); |
| 1476 | ELF_SET_FIELD (type_functions, ei_class, Sym, |
| 1477 | ent, st_size, Elf_Word, 0); |
| 1478 | } |
| 1479 | else if (raw_st_shndx < SHN_LORESERVE |
| 1480 | || raw_st_shndx == SHN_XINDEX) |
| 1481 | /* Remap the section reference. */ |
| 1482 | ELF_SET_FIELD (type_functions, ei_class, Sym, |
| 1483 | ent, st_shndx, Elf_Half, sh_map[st_shndx]); |
| 1484 | } |
| 1485 | XDELETEVEC (strings); |
| 1486 | XDELETEVEC (shndx_table); |
| 1487 | } |
| 1488 | else if (sh_type == SHT_GROUP) |
| 1489 | { |
| 1490 | /* Remap section indices in groups and remove removed members. */ |
| 1491 | unsigned char *ent, *dst; |
| 1492 | for (dst = ent = buf + 4; ent < buf + length; ent += 4) |
| 1493 | { |
| 1494 | unsigned shndx = type_functions->fetch_Elf_Word (ent); |
| 1495 | if (pfnret[shndx - 1] == -1) |
| 1496 | ; |
| 1497 | else |
| 1498 | { |
| 1499 | type_functions->set_Elf_Word (dst, sh_map[shndx]); |
| 1500 | dst += 4; |
| 1501 | } |
| 1502 | } |
| 1503 | /* Adjust the length. */ |
| 1504 | length = dst - buf; |
| 1505 | } |
| 1506 | |
| 1507 | errmsg = simple_object_write_add_data (dobj, dest, |
| 1508 | buf, length, 1, err); |
| 1509 | XDELETEVEC (buf); |
| 1510 | if (errmsg) |
| 1511 | { |
| 1512 | XDELETEVEC (names); |
| 1513 | XDELETEVEC (shdrs); |
| 1514 | XDELETEVEC (symtab_indices_shndx); |
| 1515 | return errmsg; |
| 1516 | } |
| 1517 | |
| 1518 | flags = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, |
| 1519 | shdr, sh_flags, Elf_Addr); |
| 1520 | /* Remap the section references. */ |
| 1521 | { |
| 1522 | unsigned int sh_info, sh_link; |
| 1523 | if (flags & SHF_INFO_LINK || sh_type == SHT_REL || sh_type == SHT_RELA) |
| 1524 | { |
| 1525 | sh_info = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, |
| 1526 | shdr, sh_info, Elf_Word); |
| 1527 | if (sh_info < SHN_LORESERVE |
| 1528 | || sh_info > SHN_HIRESERVE) |
| 1529 | sh_info = sh_map[sh_info]; |
| 1530 | ELF_SET_FIELD (type_functions, ei_class, Shdr, |
| 1531 | shdr, sh_info, Elf_Word, sh_info); |
| 1532 | } |
| 1533 | sh_link = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, |
| 1534 | shdr, sh_link, Elf_Word); |
| 1535 | if (sh_link < SHN_LORESERVE |
| 1536 | || sh_link > SHN_HIRESERVE) |
| 1537 | sh_link = sh_map[sh_link]; |
| 1538 | ELF_SET_FIELD (type_functions, ei_class, Shdr, |
| 1539 | shdr, sh_link, Elf_Word, sh_link); |
| 1540 | } |
| 1541 | /* The debugobj doesn't contain any code, thus no trampolines. |
| 1542 | Even when the original object needs trampolines, debugobj |
| 1543 | doesn't. */ |
| 1544 | if (strcmp (name, ".note.GNU-stack") == 0) |
| 1545 | flags &= ~SHF_EXECINSTR; |
| 1546 | /* Clear SHF_EXCLUDE on to be preserved sections. */ |
| 1547 | flags &= ~SHF_EXCLUDE; |
| 1548 | ELF_SET_FIELD (type_functions, ei_class, Shdr, |
| 1549 | shdr, sh_flags, Elf_Addr, flags); |
| 1550 | } |
| 1551 | |
| 1552 | XDELETEVEC (names); |
| 1553 | XDELETEVEC (shdrs); |
| 1554 | XDELETEVEC (pfnret); |
| 1555 | XDELETEVEC (pfnname); |
| 1556 | XDELETEVEC (symtab_indices_shndx); |
| 1557 | XDELETEVEC (sh_map); |
| 1558 | |
| 1559 | return NULL; |
| 1560 | } |
| 1561 | |
| 1562 | |
| 1563 | /* The ELF functions. */ |
| 1564 | |
| 1565 | const struct simple_object_functions simple_object_elf_functions = |
| 1566 | { |
| 1567 | simple_object_elf_match, |
| 1568 | simple_object_elf_find_sections, |
| 1569 | simple_object_elf_fetch_attributes, |
| 1570 | simple_object_elf_release_read, |
| 1571 | simple_object_elf_attributes_merge, |
| 1572 | simple_object_elf_release_attributes, |
| 1573 | simple_object_elf_start_write, |
| 1574 | simple_object_elf_write_to_file, |
| 1575 | simple_object_elf_release_write, |
| 1576 | simple_object_elf_copy_lto_debug_sections |
| 1577 | }; |