| 1 | /* ELF executable support for BFD. |
| 2 | Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, |
| 3 | 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 |
| 4 | Free Software Foundation, Inc. |
| 5 | |
| 6 | Written by Fred Fish @ Cygnus Support, from information published |
| 7 | in "UNIX System V Release 4, Programmers Guide: ANSI C and |
| 8 | Programming Support Tools". Sufficient support for gdb. |
| 9 | |
| 10 | Rewritten by Mark Eichin @ Cygnus Support, from information |
| 11 | published in "System V Application Binary Interface", chapters 4 |
| 12 | and 5, as well as the various "Processor Supplement" documents |
| 13 | derived from it. Added support for assembler and other object file |
| 14 | utilities. Further work done by Ken Raeburn (Cygnus Support), Michael |
| 15 | Meissner (Open Software Foundation), and Peter Hoogenboom (University |
| 16 | of Utah) to finish and extend this. |
| 17 | |
| 18 | This file is part of BFD, the Binary File Descriptor library. |
| 19 | |
| 20 | This program is free software; you can redistribute it and/or modify |
| 21 | it under the terms of the GNU General Public License as published by |
| 22 | the Free Software Foundation; either version 3 of the License, or |
| 23 | (at your option) any later version. |
| 24 | |
| 25 | This program is distributed in the hope that it will be useful, |
| 26 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 27 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 28 | GNU General Public License for more details. |
| 29 | |
| 30 | You should have received a copy of the GNU General Public License |
| 31 | along with this program; if not, write to the Free Software |
| 32 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 33 | MA 02110-1301, USA. */ |
| 34 | |
| 35 | |
| 36 | /* Problems and other issues to resolve. |
| 37 | |
| 38 | (1) BFD expects there to be some fixed number of "sections" in |
| 39 | the object file. I.E. there is a "section_count" variable in the |
| 40 | bfd structure which contains the number of sections. However, ELF |
| 41 | supports multiple "views" of a file. In particular, with current |
| 42 | implementations, executable files typically have two tables, a |
| 43 | program header table and a section header table, both of which |
| 44 | partition the executable. |
| 45 | |
| 46 | In ELF-speak, the "linking view" of the file uses the section header |
| 47 | table to access "sections" within the file, and the "execution view" |
| 48 | uses the program header table to access "segments" within the file. |
| 49 | "Segments" typically may contain all the data from one or more |
| 50 | "sections". |
| 51 | |
| 52 | Note that the section header table is optional in ELF executables, |
| 53 | but it is this information that is most useful to gdb. If the |
| 54 | section header table is missing, then gdb should probably try |
| 55 | to make do with the program header table. (FIXME) |
| 56 | |
| 57 | (2) The code in this file is compiled twice, once in 32-bit mode and |
| 58 | once in 64-bit mode. More of it should be made size-independent |
| 59 | and moved into elf.c. |
| 60 | |
| 61 | (3) ELF section symbols are handled rather sloppily now. This should |
| 62 | be cleaned up, and ELF section symbols reconciled with BFD section |
| 63 | symbols. |
| 64 | |
| 65 | (4) We need a published spec for 64-bit ELF. We've got some stuff here |
| 66 | that we're using for SPARC V9 64-bit chips, but don't assume that |
| 67 | it's cast in stone. |
| 68 | */ |
| 69 | |
| 70 | #include "sysdep.h" |
| 71 | #include "bfd.h" |
| 72 | #include "libiberty.h" |
| 73 | #include "bfdlink.h" |
| 74 | #include "libbfd.h" |
| 75 | #include "elf-bfd.h" |
| 76 | |
| 77 | /* Renaming structures, typedefs, macros and functions to be size-specific. */ |
| 78 | #define Elf_External_Ehdr NAME(Elf,External_Ehdr) |
| 79 | #define Elf_External_Sym NAME(Elf,External_Sym) |
| 80 | #define Elf_External_Shdr NAME(Elf,External_Shdr) |
| 81 | #define Elf_External_Phdr NAME(Elf,External_Phdr) |
| 82 | #define Elf_External_Rel NAME(Elf,External_Rel) |
| 83 | #define Elf_External_Rela NAME(Elf,External_Rela) |
| 84 | #define Elf_External_Dyn NAME(Elf,External_Dyn) |
| 85 | |
| 86 | #define elf_core_file_failing_command NAME(bfd_elf,core_file_failing_command) |
| 87 | #define elf_core_file_failing_signal NAME(bfd_elf,core_file_failing_signal) |
| 88 | #define elf_core_file_matches_executable_p \ |
| 89 | NAME(bfd_elf,core_file_matches_executable_p) |
| 90 | #define elf_object_p NAME(bfd_elf,object_p) |
| 91 | #define elf_core_file_p NAME(bfd_elf,core_file_p) |
| 92 | #define elf_get_symtab_upper_bound NAME(bfd_elf,get_symtab_upper_bound) |
| 93 | #define elf_get_dynamic_symtab_upper_bound \ |
| 94 | NAME(bfd_elf,get_dynamic_symtab_upper_bound) |
| 95 | #define elf_swap_reloc_in NAME(bfd_elf,swap_reloc_in) |
| 96 | #define elf_swap_reloca_in NAME(bfd_elf,swap_reloca_in) |
| 97 | #define elf_swap_reloc_out NAME(bfd_elf,swap_reloc_out) |
| 98 | #define elf_swap_reloca_out NAME(bfd_elf,swap_reloca_out) |
| 99 | #define elf_swap_symbol_in NAME(bfd_elf,swap_symbol_in) |
| 100 | #define elf_swap_symbol_out NAME(bfd_elf,swap_symbol_out) |
| 101 | #define elf_swap_phdr_in NAME(bfd_elf,swap_phdr_in) |
| 102 | #define elf_swap_phdr_out NAME(bfd_elf,swap_phdr_out) |
| 103 | #define elf_swap_dyn_in NAME(bfd_elf,swap_dyn_in) |
| 104 | #define elf_swap_dyn_out NAME(bfd_elf,swap_dyn_out) |
| 105 | #define elf_get_reloc_upper_bound NAME(bfd_elf,get_reloc_upper_bound) |
| 106 | #define elf_canonicalize_reloc NAME(bfd_elf,canonicalize_reloc) |
| 107 | #define elf_slurp_symbol_table NAME(bfd_elf,slurp_symbol_table) |
| 108 | #define elf_canonicalize_symtab NAME(bfd_elf,canonicalize_symtab) |
| 109 | #define elf_canonicalize_dynamic_symtab \ |
| 110 | NAME(bfd_elf,canonicalize_dynamic_symtab) |
| 111 | #define elf_get_synthetic_symtab \ |
| 112 | NAME(bfd_elf,get_synthetic_symtab) |
| 113 | #define elf_make_empty_symbol NAME(bfd_elf,make_empty_symbol) |
| 114 | #define elf_get_symbol_info NAME(bfd_elf,get_symbol_info) |
| 115 | #define elf_get_lineno NAME(bfd_elf,get_lineno) |
| 116 | #define elf_set_arch_mach NAME(bfd_elf,set_arch_mach) |
| 117 | #define elf_find_nearest_line NAME(bfd_elf,find_nearest_line) |
| 118 | #define elf_sizeof_headers NAME(bfd_elf,sizeof_headers) |
| 119 | #define elf_set_section_contents NAME(bfd_elf,set_section_contents) |
| 120 | #define elf_no_info_to_howto NAME(bfd_elf,no_info_to_howto) |
| 121 | #define elf_no_info_to_howto_rel NAME(bfd_elf,no_info_to_howto_rel) |
| 122 | #define elf_find_section NAME(bfd_elf,find_section) |
| 123 | #define elf_write_shdrs_and_ehdr NAME(bfd_elf,write_shdrs_and_ehdr) |
| 124 | #define elf_write_out_phdrs NAME(bfd_elf,write_out_phdrs) |
| 125 | #define elf_checksum_contents NAME(bfd_elf,checksum_contents) |
| 126 | #define elf_write_relocs NAME(bfd_elf,write_relocs) |
| 127 | #define elf_slurp_reloc_table NAME(bfd_elf,slurp_reloc_table) |
| 128 | |
| 129 | #if ARCH_SIZE == 64 |
| 130 | #define ELF_R_INFO(X,Y) ELF64_R_INFO(X,Y) |
| 131 | #define ELF_R_SYM(X) ELF64_R_SYM(X) |
| 132 | #define ELF_R_TYPE(X) ELF64_R_TYPE(X) |
| 133 | #define ELFCLASS ELFCLASS64 |
| 134 | #define FILE_ALIGN 8 |
| 135 | #define LOG_FILE_ALIGN 3 |
| 136 | #endif |
| 137 | #if ARCH_SIZE == 32 |
| 138 | #define ELF_R_INFO(X,Y) ELF32_R_INFO(X,Y) |
| 139 | #define ELF_R_SYM(X) ELF32_R_SYM(X) |
| 140 | #define ELF_R_TYPE(X) ELF32_R_TYPE(X) |
| 141 | #define ELFCLASS ELFCLASS32 |
| 142 | #define FILE_ALIGN 4 |
| 143 | #define LOG_FILE_ALIGN 2 |
| 144 | #endif |
| 145 | |
| 146 | #if DEBUG & 2 |
| 147 | static void elf_debug_section (int, Elf_Internal_Shdr *); |
| 148 | #endif |
| 149 | #if DEBUG & 1 |
| 150 | static void elf_debug_file (Elf_Internal_Ehdr *); |
| 151 | #endif |
| 152 | \f |
| 153 | /* Structure swapping routines */ |
| 154 | |
| 155 | /* Should perhaps use put_offset, put_word, etc. For now, the two versions |
| 156 | can be handled by explicitly specifying 32 bits or "the long type". */ |
| 157 | #if ARCH_SIZE == 64 |
| 158 | #define H_PUT_WORD H_PUT_64 |
| 159 | #define H_PUT_SIGNED_WORD H_PUT_S64 |
| 160 | #define H_GET_WORD H_GET_64 |
| 161 | #define H_GET_SIGNED_WORD H_GET_S64 |
| 162 | #endif |
| 163 | #if ARCH_SIZE == 32 |
| 164 | #define H_PUT_WORD H_PUT_32 |
| 165 | #define H_PUT_SIGNED_WORD H_PUT_S32 |
| 166 | #define H_GET_WORD H_GET_32 |
| 167 | #define H_GET_SIGNED_WORD H_GET_S32 |
| 168 | #endif |
| 169 | |
| 170 | /* Translate an ELF symbol in external format into an ELF symbol in internal |
| 171 | format. */ |
| 172 | |
| 173 | bfd_boolean |
| 174 | elf_swap_symbol_in (bfd *abfd, |
| 175 | const void *psrc, |
| 176 | const void *pshn, |
| 177 | Elf_Internal_Sym *dst) |
| 178 | { |
| 179 | const Elf_External_Sym *src = psrc; |
| 180 | const Elf_External_Sym_Shndx *shndx = pshn; |
| 181 | int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma; |
| 182 | |
| 183 | dst->st_name = H_GET_32 (abfd, src->st_name); |
| 184 | if (signed_vma) |
| 185 | dst->st_value = H_GET_SIGNED_WORD (abfd, src->st_value); |
| 186 | else |
| 187 | dst->st_value = H_GET_WORD (abfd, src->st_value); |
| 188 | dst->st_size = H_GET_WORD (abfd, src->st_size); |
| 189 | dst->st_info = H_GET_8 (abfd, src->st_info); |
| 190 | dst->st_other = H_GET_8 (abfd, src->st_other); |
| 191 | dst->st_shndx = H_GET_16 (abfd, src->st_shndx); |
| 192 | if (dst->st_shndx == (SHN_XINDEX & 0xffff)) |
| 193 | { |
| 194 | if (shndx == NULL) |
| 195 | return FALSE; |
| 196 | dst->st_shndx = H_GET_32 (abfd, shndx->est_shndx); |
| 197 | } |
| 198 | else if (dst->st_shndx >= (SHN_LORESERVE & 0xffff)) |
| 199 | dst->st_shndx += SHN_LORESERVE - (SHN_LORESERVE & 0xffff); |
| 200 | return TRUE; |
| 201 | } |
| 202 | |
| 203 | /* Translate an ELF symbol in internal format into an ELF symbol in external |
| 204 | format. */ |
| 205 | |
| 206 | void |
| 207 | elf_swap_symbol_out (bfd *abfd, |
| 208 | const Elf_Internal_Sym *src, |
| 209 | void *cdst, |
| 210 | void *shndx) |
| 211 | { |
| 212 | unsigned int tmp; |
| 213 | Elf_External_Sym *dst = cdst; |
| 214 | H_PUT_32 (abfd, src->st_name, dst->st_name); |
| 215 | H_PUT_WORD (abfd, src->st_value, dst->st_value); |
| 216 | H_PUT_WORD (abfd, src->st_size, dst->st_size); |
| 217 | H_PUT_8 (abfd, src->st_info, dst->st_info); |
| 218 | H_PUT_8 (abfd, src->st_other, dst->st_other); |
| 219 | tmp = src->st_shndx; |
| 220 | if (tmp >= (SHN_LORESERVE & 0xffff) && tmp < SHN_LORESERVE) |
| 221 | { |
| 222 | if (shndx == NULL) |
| 223 | abort (); |
| 224 | H_PUT_32 (abfd, tmp, shndx); |
| 225 | tmp = SHN_XINDEX & 0xffff; |
| 226 | } |
| 227 | H_PUT_16 (abfd, tmp, dst->st_shndx); |
| 228 | } |
| 229 | |
| 230 | /* Translate an ELF file header in external format into an ELF file header in |
| 231 | internal format. */ |
| 232 | |
| 233 | static void |
| 234 | elf_swap_ehdr_in (bfd *abfd, |
| 235 | const Elf_External_Ehdr *src, |
| 236 | Elf_Internal_Ehdr *dst) |
| 237 | { |
| 238 | int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma; |
| 239 | memcpy (dst->e_ident, src->e_ident, EI_NIDENT); |
| 240 | dst->e_type = H_GET_16 (abfd, src->e_type); |
| 241 | dst->e_machine = H_GET_16 (abfd, src->e_machine); |
| 242 | dst->e_version = H_GET_32 (abfd, src->e_version); |
| 243 | if (signed_vma) |
| 244 | dst->e_entry = H_GET_SIGNED_WORD (abfd, src->e_entry); |
| 245 | else |
| 246 | dst->e_entry = H_GET_WORD (abfd, src->e_entry); |
| 247 | dst->e_phoff = H_GET_WORD (abfd, src->e_phoff); |
| 248 | dst->e_shoff = H_GET_WORD (abfd, src->e_shoff); |
| 249 | dst->e_flags = H_GET_32 (abfd, src->e_flags); |
| 250 | dst->e_ehsize = H_GET_16 (abfd, src->e_ehsize); |
| 251 | dst->e_phentsize = H_GET_16 (abfd, src->e_phentsize); |
| 252 | dst->e_phnum = H_GET_16 (abfd, src->e_phnum); |
| 253 | dst->e_shentsize = H_GET_16 (abfd, src->e_shentsize); |
| 254 | dst->e_shnum = H_GET_16 (abfd, src->e_shnum); |
| 255 | dst->e_shstrndx = H_GET_16 (abfd, src->e_shstrndx); |
| 256 | } |
| 257 | |
| 258 | /* Translate an ELF file header in internal format into an ELF file header in |
| 259 | external format. */ |
| 260 | |
| 261 | static void |
| 262 | elf_swap_ehdr_out (bfd *abfd, |
| 263 | const Elf_Internal_Ehdr *src, |
| 264 | Elf_External_Ehdr *dst) |
| 265 | { |
| 266 | unsigned int tmp; |
| 267 | int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma; |
| 268 | memcpy (dst->e_ident, src->e_ident, EI_NIDENT); |
| 269 | /* note that all elements of dst are *arrays of unsigned char* already... */ |
| 270 | H_PUT_16 (abfd, src->e_type, dst->e_type); |
| 271 | H_PUT_16 (abfd, src->e_machine, dst->e_machine); |
| 272 | H_PUT_32 (abfd, src->e_version, dst->e_version); |
| 273 | if (signed_vma) |
| 274 | H_PUT_SIGNED_WORD (abfd, src->e_entry, dst->e_entry); |
| 275 | else |
| 276 | H_PUT_WORD (abfd, src->e_entry, dst->e_entry); |
| 277 | H_PUT_WORD (abfd, src->e_phoff, dst->e_phoff); |
| 278 | H_PUT_WORD (abfd, src->e_shoff, dst->e_shoff); |
| 279 | H_PUT_32 (abfd, src->e_flags, dst->e_flags); |
| 280 | H_PUT_16 (abfd, src->e_ehsize, dst->e_ehsize); |
| 281 | H_PUT_16 (abfd, src->e_phentsize, dst->e_phentsize); |
| 282 | H_PUT_16 (abfd, src->e_phnum, dst->e_phnum); |
| 283 | H_PUT_16 (abfd, src->e_shentsize, dst->e_shentsize); |
| 284 | tmp = src->e_shnum; |
| 285 | if (tmp >= (SHN_LORESERVE & 0xffff)) |
| 286 | tmp = SHN_UNDEF; |
| 287 | H_PUT_16 (abfd, tmp, dst->e_shnum); |
| 288 | tmp = src->e_shstrndx; |
| 289 | if (tmp >= (SHN_LORESERVE & 0xffff)) |
| 290 | tmp = SHN_XINDEX & 0xffff; |
| 291 | H_PUT_16 (abfd, tmp, dst->e_shstrndx); |
| 292 | } |
| 293 | |
| 294 | /* Translate an ELF section header table entry in external format into an |
| 295 | ELF section header table entry in internal format. */ |
| 296 | |
| 297 | static void |
| 298 | elf_swap_shdr_in (bfd *abfd, |
| 299 | const Elf_External_Shdr *src, |
| 300 | Elf_Internal_Shdr *dst) |
| 301 | { |
| 302 | int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma; |
| 303 | |
| 304 | dst->sh_name = H_GET_32 (abfd, src->sh_name); |
| 305 | dst->sh_type = H_GET_32 (abfd, src->sh_type); |
| 306 | dst->sh_flags = H_GET_WORD (abfd, src->sh_flags); |
| 307 | if (signed_vma) |
| 308 | dst->sh_addr = H_GET_SIGNED_WORD (abfd, src->sh_addr); |
| 309 | else |
| 310 | dst->sh_addr = H_GET_WORD (abfd, src->sh_addr); |
| 311 | dst->sh_offset = H_GET_WORD (abfd, src->sh_offset); |
| 312 | dst->sh_size = H_GET_WORD (abfd, src->sh_size); |
| 313 | dst->sh_link = H_GET_32 (abfd, src->sh_link); |
| 314 | dst->sh_info = H_GET_32 (abfd, src->sh_info); |
| 315 | dst->sh_addralign = H_GET_WORD (abfd, src->sh_addralign); |
| 316 | dst->sh_entsize = H_GET_WORD (abfd, src->sh_entsize); |
| 317 | dst->bfd_section = NULL; |
| 318 | dst->contents = NULL; |
| 319 | } |
| 320 | |
| 321 | /* Translate an ELF section header table entry in internal format into an |
| 322 | ELF section header table entry in external format. */ |
| 323 | |
| 324 | static void |
| 325 | elf_swap_shdr_out (bfd *abfd, |
| 326 | const Elf_Internal_Shdr *src, |
| 327 | Elf_External_Shdr *dst) |
| 328 | { |
| 329 | /* note that all elements of dst are *arrays of unsigned char* already... */ |
| 330 | H_PUT_32 (abfd, src->sh_name, dst->sh_name); |
| 331 | H_PUT_32 (abfd, src->sh_type, dst->sh_type); |
| 332 | H_PUT_WORD (abfd, src->sh_flags, dst->sh_flags); |
| 333 | H_PUT_WORD (abfd, src->sh_addr, dst->sh_addr); |
| 334 | H_PUT_WORD (abfd, src->sh_offset, dst->sh_offset); |
| 335 | H_PUT_WORD (abfd, src->sh_size, dst->sh_size); |
| 336 | H_PUT_32 (abfd, src->sh_link, dst->sh_link); |
| 337 | H_PUT_32 (abfd, src->sh_info, dst->sh_info); |
| 338 | H_PUT_WORD (abfd, src->sh_addralign, dst->sh_addralign); |
| 339 | H_PUT_WORD (abfd, src->sh_entsize, dst->sh_entsize); |
| 340 | } |
| 341 | |
| 342 | /* Translate an ELF program header table entry in external format into an |
| 343 | ELF program header table entry in internal format. */ |
| 344 | |
| 345 | void |
| 346 | elf_swap_phdr_in (bfd *abfd, |
| 347 | const Elf_External_Phdr *src, |
| 348 | Elf_Internal_Phdr *dst) |
| 349 | { |
| 350 | int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma; |
| 351 | |
| 352 | dst->p_type = H_GET_32 (abfd, src->p_type); |
| 353 | dst->p_flags = H_GET_32 (abfd, src->p_flags); |
| 354 | dst->p_offset = H_GET_WORD (abfd, src->p_offset); |
| 355 | if (signed_vma) |
| 356 | { |
| 357 | dst->p_vaddr = H_GET_SIGNED_WORD (abfd, src->p_vaddr); |
| 358 | dst->p_paddr = H_GET_SIGNED_WORD (abfd, src->p_paddr); |
| 359 | } |
| 360 | else |
| 361 | { |
| 362 | dst->p_vaddr = H_GET_WORD (abfd, src->p_vaddr); |
| 363 | dst->p_paddr = H_GET_WORD (abfd, src->p_paddr); |
| 364 | } |
| 365 | dst->p_filesz = H_GET_WORD (abfd, src->p_filesz); |
| 366 | dst->p_memsz = H_GET_WORD (abfd, src->p_memsz); |
| 367 | dst->p_align = H_GET_WORD (abfd, src->p_align); |
| 368 | } |
| 369 | |
| 370 | void |
| 371 | elf_swap_phdr_out (bfd *abfd, |
| 372 | const Elf_Internal_Phdr *src, |
| 373 | Elf_External_Phdr *dst) |
| 374 | { |
| 375 | const struct elf_backend_data *bed; |
| 376 | bfd_vma p_paddr; |
| 377 | |
| 378 | bed = get_elf_backend_data (abfd); |
| 379 | p_paddr = bed->want_p_paddr_set_to_zero ? 0 : src->p_paddr; |
| 380 | |
| 381 | /* note that all elements of dst are *arrays of unsigned char* already... */ |
| 382 | H_PUT_32 (abfd, src->p_type, dst->p_type); |
| 383 | H_PUT_WORD (abfd, src->p_offset, dst->p_offset); |
| 384 | H_PUT_WORD (abfd, src->p_vaddr, dst->p_vaddr); |
| 385 | H_PUT_WORD (abfd, p_paddr, dst->p_paddr); |
| 386 | H_PUT_WORD (abfd, src->p_filesz, dst->p_filesz); |
| 387 | H_PUT_WORD (abfd, src->p_memsz, dst->p_memsz); |
| 388 | H_PUT_32 (abfd, src->p_flags, dst->p_flags); |
| 389 | H_PUT_WORD (abfd, src->p_align, dst->p_align); |
| 390 | } |
| 391 | |
| 392 | /* Translate an ELF reloc from external format to internal format. */ |
| 393 | void |
| 394 | elf_swap_reloc_in (bfd *abfd, |
| 395 | const bfd_byte *s, |
| 396 | Elf_Internal_Rela *dst) |
| 397 | { |
| 398 | const Elf_External_Rel *src = (const Elf_External_Rel *) s; |
| 399 | dst->r_offset = H_GET_WORD (abfd, src->r_offset); |
| 400 | dst->r_info = H_GET_WORD (abfd, src->r_info); |
| 401 | dst->r_addend = 0; |
| 402 | } |
| 403 | |
| 404 | void |
| 405 | elf_swap_reloca_in (bfd *abfd, |
| 406 | const bfd_byte *s, |
| 407 | Elf_Internal_Rela *dst) |
| 408 | { |
| 409 | const Elf_External_Rela *src = (const Elf_External_Rela *) s; |
| 410 | dst->r_offset = H_GET_WORD (abfd, src->r_offset); |
| 411 | dst->r_info = H_GET_WORD (abfd, src->r_info); |
| 412 | dst->r_addend = H_GET_SIGNED_WORD (abfd, src->r_addend); |
| 413 | } |
| 414 | |
| 415 | /* Translate an ELF reloc from internal format to external format. */ |
| 416 | void |
| 417 | elf_swap_reloc_out (bfd *abfd, |
| 418 | const Elf_Internal_Rela *src, |
| 419 | bfd_byte *d) |
| 420 | { |
| 421 | Elf_External_Rel *dst = (Elf_External_Rel *) d; |
| 422 | H_PUT_WORD (abfd, src->r_offset, dst->r_offset); |
| 423 | H_PUT_WORD (abfd, src->r_info, dst->r_info); |
| 424 | } |
| 425 | |
| 426 | void |
| 427 | elf_swap_reloca_out (bfd *abfd, |
| 428 | const Elf_Internal_Rela *src, |
| 429 | bfd_byte *d) |
| 430 | { |
| 431 | Elf_External_Rela *dst = (Elf_External_Rela *) d; |
| 432 | H_PUT_WORD (abfd, src->r_offset, dst->r_offset); |
| 433 | H_PUT_WORD (abfd, src->r_info, dst->r_info); |
| 434 | H_PUT_SIGNED_WORD (abfd, src->r_addend, dst->r_addend); |
| 435 | } |
| 436 | |
| 437 | void |
| 438 | elf_swap_dyn_in (bfd *abfd, |
| 439 | const void *p, |
| 440 | Elf_Internal_Dyn *dst) |
| 441 | { |
| 442 | const Elf_External_Dyn *src = p; |
| 443 | |
| 444 | dst->d_tag = H_GET_WORD (abfd, src->d_tag); |
| 445 | dst->d_un.d_val = H_GET_WORD (abfd, src->d_un.d_val); |
| 446 | } |
| 447 | |
| 448 | void |
| 449 | elf_swap_dyn_out (bfd *abfd, |
| 450 | const Elf_Internal_Dyn *src, |
| 451 | void *p) |
| 452 | { |
| 453 | Elf_External_Dyn *dst = p; |
| 454 | |
| 455 | H_PUT_WORD (abfd, src->d_tag, dst->d_tag); |
| 456 | H_PUT_WORD (abfd, src->d_un.d_val, dst->d_un.d_val); |
| 457 | } |
| 458 | \f |
| 459 | /* ELF .o/exec file reading */ |
| 460 | |
| 461 | /* Begin processing a given object. |
| 462 | |
| 463 | First we validate the file by reading in the ELF header and checking |
| 464 | the magic number. */ |
| 465 | |
| 466 | static inline bfd_boolean |
| 467 | elf_file_p (Elf_External_Ehdr *x_ehdrp) |
| 468 | { |
| 469 | return ((x_ehdrp->e_ident[EI_MAG0] == ELFMAG0) |
| 470 | && (x_ehdrp->e_ident[EI_MAG1] == ELFMAG1) |
| 471 | && (x_ehdrp->e_ident[EI_MAG2] == ELFMAG2) |
| 472 | && (x_ehdrp->e_ident[EI_MAG3] == ELFMAG3)); |
| 473 | } |
| 474 | |
| 475 | /* Check to see if the file associated with ABFD matches the target vector |
| 476 | that ABFD points to. |
| 477 | |
| 478 | Note that we may be called several times with the same ABFD, but different |
| 479 | target vectors, most of which will not match. We have to avoid leaving |
| 480 | any side effects in ABFD, or any data it points to (like tdata), if the |
| 481 | file does not match the target vector. */ |
| 482 | |
| 483 | const bfd_target * |
| 484 | elf_object_p (bfd *abfd) |
| 485 | { |
| 486 | Elf_External_Ehdr x_ehdr; /* Elf file header, external form */ |
| 487 | Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */ |
| 488 | Elf_External_Shdr x_shdr; /* Section header table entry, external form */ |
| 489 | Elf_Internal_Shdr i_shdr; |
| 490 | Elf_Internal_Shdr *i_shdrp; /* Section header table, internal form */ |
| 491 | unsigned int shindex; |
| 492 | const struct elf_backend_data *ebd; |
| 493 | struct bfd_preserve preserve; |
| 494 | asection *s; |
| 495 | bfd_size_type amt; |
| 496 | const bfd_target *target; |
| 497 | const bfd_target * const *target_ptr; |
| 498 | |
| 499 | preserve.marker = NULL; |
| 500 | |
| 501 | /* Read in the ELF header in external format. */ |
| 502 | |
| 503 | if (bfd_bread (&x_ehdr, sizeof (x_ehdr), abfd) != sizeof (x_ehdr)) |
| 504 | { |
| 505 | if (bfd_get_error () != bfd_error_system_call) |
| 506 | goto got_wrong_format_error; |
| 507 | else |
| 508 | goto got_no_match; |
| 509 | } |
| 510 | |
| 511 | /* Now check to see if we have a valid ELF file, and one that BFD can |
| 512 | make use of. The magic number must match, the address size ('class') |
| 513 | and byte-swapping must match our XVEC entry, and it must have a |
| 514 | section header table (FIXME: See comments re sections at top of this |
| 515 | file). */ |
| 516 | |
| 517 | if (! elf_file_p (&x_ehdr) |
| 518 | || x_ehdr.e_ident[EI_VERSION] != EV_CURRENT |
| 519 | || x_ehdr.e_ident[EI_CLASS] != ELFCLASS) |
| 520 | goto got_wrong_format_error; |
| 521 | |
| 522 | /* Check that file's byte order matches xvec's */ |
| 523 | switch (x_ehdr.e_ident[EI_DATA]) |
| 524 | { |
| 525 | case ELFDATA2MSB: /* Big-endian */ |
| 526 | if (! bfd_header_big_endian (abfd)) |
| 527 | goto got_wrong_format_error; |
| 528 | break; |
| 529 | case ELFDATA2LSB: /* Little-endian */ |
| 530 | if (! bfd_header_little_endian (abfd)) |
| 531 | goto got_wrong_format_error; |
| 532 | break; |
| 533 | case ELFDATANONE: /* No data encoding specified */ |
| 534 | default: /* Unknown data encoding specified */ |
| 535 | goto got_wrong_format_error; |
| 536 | } |
| 537 | |
| 538 | if (!bfd_preserve_save (abfd, &preserve)) |
| 539 | goto got_no_match; |
| 540 | |
| 541 | target = abfd->xvec; |
| 542 | |
| 543 | /* Allocate an instance of the elf_obj_tdata structure and hook it up to |
| 544 | the tdata pointer in the bfd. */ |
| 545 | |
| 546 | if (! (*target->_bfd_set_format[bfd_object]) (abfd)) |
| 547 | goto got_no_match; |
| 548 | preserve.marker = elf_tdata (abfd); |
| 549 | |
| 550 | /* Now that we know the byte order, swap in the rest of the header */ |
| 551 | i_ehdrp = elf_elfheader (abfd); |
| 552 | elf_swap_ehdr_in (abfd, &x_ehdr, i_ehdrp); |
| 553 | #if DEBUG & 1 |
| 554 | elf_debug_file (i_ehdrp); |
| 555 | #endif |
| 556 | |
| 557 | /* Reject ET_CORE (header indicates core file, not object file) */ |
| 558 | if (i_ehdrp->e_type == ET_CORE) |
| 559 | goto got_wrong_format_error; |
| 560 | |
| 561 | /* If this is a relocatable file and there is no section header |
| 562 | table, then we're hosed. */ |
| 563 | if (i_ehdrp->e_shoff == 0 && i_ehdrp->e_type == ET_REL) |
| 564 | goto got_wrong_format_error; |
| 565 | |
| 566 | /* As a simple sanity check, verify that what BFD thinks is the |
| 567 | size of each section header table entry actually matches the size |
| 568 | recorded in the file, but only if there are any sections. */ |
| 569 | if (i_ehdrp->e_shentsize != sizeof (x_shdr) && i_ehdrp->e_shnum != 0) |
| 570 | goto got_wrong_format_error; |
| 571 | |
| 572 | /* Further sanity check. */ |
| 573 | if (i_ehdrp->e_shoff == 0 && i_ehdrp->e_shnum != 0) |
| 574 | goto got_wrong_format_error; |
| 575 | |
| 576 | ebd = get_elf_backend_data (abfd); |
| 577 | |
| 578 | /* Check that the ELF e_machine field matches what this particular |
| 579 | BFD format expects. */ |
| 580 | if (ebd->elf_machine_code != i_ehdrp->e_machine |
| 581 | && (ebd->elf_machine_alt1 == 0 |
| 582 | || i_ehdrp->e_machine != ebd->elf_machine_alt1) |
| 583 | && (ebd->elf_machine_alt2 == 0 |
| 584 | || i_ehdrp->e_machine != ebd->elf_machine_alt2)) |
| 585 | { |
| 586 | if (ebd->elf_machine_code != EM_NONE) |
| 587 | goto got_wrong_format_error; |
| 588 | |
| 589 | /* This is the generic ELF target. Let it match any ELF target |
| 590 | for which we do not have a specific backend. */ |
| 591 | for (target_ptr = bfd_target_vector; *target_ptr != NULL; target_ptr++) |
| 592 | { |
| 593 | const struct elf_backend_data *back; |
| 594 | |
| 595 | if ((*target_ptr)->flavour != bfd_target_elf_flavour) |
| 596 | continue; |
| 597 | back = xvec_get_elf_backend_data (*target_ptr); |
| 598 | if (back->elf_machine_code == i_ehdrp->e_machine |
| 599 | || (back->elf_machine_alt1 != 0 |
| 600 | && back->elf_machine_alt1 == i_ehdrp->e_machine) |
| 601 | || (back->elf_machine_alt2 != 0 |
| 602 | && back->elf_machine_alt2 == i_ehdrp->e_machine)) |
| 603 | { |
| 604 | /* target_ptr is an ELF backend which matches this |
| 605 | object file, so reject the generic ELF target. */ |
| 606 | goto got_wrong_format_error; |
| 607 | } |
| 608 | } |
| 609 | } |
| 610 | |
| 611 | if (i_ehdrp->e_type == ET_EXEC) |
| 612 | abfd->flags |= EXEC_P; |
| 613 | else if (i_ehdrp->e_type == ET_DYN) |
| 614 | abfd->flags |= DYNAMIC; |
| 615 | |
| 616 | if (i_ehdrp->e_phnum > 0) |
| 617 | abfd->flags |= D_PAGED; |
| 618 | |
| 619 | if (! bfd_default_set_arch_mach (abfd, ebd->arch, 0)) |
| 620 | { |
| 621 | /* It's OK if this fails for the generic target. */ |
| 622 | if (ebd->elf_machine_code != EM_NONE) |
| 623 | goto got_no_match; |
| 624 | } |
| 625 | |
| 626 | if (ebd->elf_machine_code != EM_NONE |
| 627 | && i_ehdrp->e_ident[EI_OSABI] != ebd->elf_osabi) |
| 628 | { |
| 629 | if (ebd->elf_osabi != ELFOSABI_NONE) |
| 630 | goto got_wrong_format_error; |
| 631 | |
| 632 | /* This is an ELFOSABI_NONE ELF target. Let it match any ELF |
| 633 | target of the compatible machine for which we do not have a |
| 634 | backend with matching ELFOSABI. */ |
| 635 | for (target_ptr = bfd_target_vector; |
| 636 | *target_ptr != NULL; |
| 637 | target_ptr++) |
| 638 | { |
| 639 | const struct elf_backend_data *back; |
| 640 | |
| 641 | /* Skip this target and targets with incompatible byte |
| 642 | order. */ |
| 643 | if (*target_ptr == target |
| 644 | || (*target_ptr)->flavour != bfd_target_elf_flavour |
| 645 | || (*target_ptr)->byteorder != target->byteorder |
| 646 | || ((*target_ptr)->header_byteorder |
| 647 | != target->header_byteorder)) |
| 648 | continue; |
| 649 | |
| 650 | back = xvec_get_elf_backend_data (*target_ptr); |
| 651 | if (back->elf_osabi == i_ehdrp->e_ident[EI_OSABI] |
| 652 | && (back->elf_machine_code == i_ehdrp->e_machine |
| 653 | || (back->elf_machine_alt1 != 0 |
| 654 | && back->elf_machine_alt1 == i_ehdrp->e_machine) |
| 655 | || (back->elf_machine_alt2 != 0 |
| 656 | && back->elf_machine_alt2 == i_ehdrp->e_machine))) |
| 657 | { |
| 658 | /* target_ptr is an ELF backend which matches this |
| 659 | object file, so reject the ELFOSABI_NONE ELF target. */ |
| 660 | goto got_wrong_format_error; |
| 661 | } |
| 662 | } |
| 663 | } |
| 664 | |
| 665 | if (i_ehdrp->e_shoff != 0) |
| 666 | { |
| 667 | bfd_signed_vma where = i_ehdrp->e_shoff; |
| 668 | |
| 669 | if (where != (file_ptr) where) |
| 670 | goto got_wrong_format_error; |
| 671 | |
| 672 | /* Seek to the section header table in the file. */ |
| 673 | if (bfd_seek (abfd, (file_ptr) where, SEEK_SET) != 0) |
| 674 | goto got_no_match; |
| 675 | |
| 676 | /* Read the first section header at index 0, and convert to internal |
| 677 | form. */ |
| 678 | if (bfd_bread (&x_shdr, sizeof x_shdr, abfd) != sizeof (x_shdr)) |
| 679 | goto got_no_match; |
| 680 | elf_swap_shdr_in (abfd, &x_shdr, &i_shdr); |
| 681 | |
| 682 | /* If the section count is zero, the actual count is in the first |
| 683 | section header. */ |
| 684 | if (i_ehdrp->e_shnum == SHN_UNDEF) |
| 685 | { |
| 686 | i_ehdrp->e_shnum = i_shdr.sh_size; |
| 687 | if (i_ehdrp->e_shnum != i_shdr.sh_size |
| 688 | || i_ehdrp->e_shnum == 0) |
| 689 | goto got_wrong_format_error; |
| 690 | } |
| 691 | |
| 692 | /* And similarly for the string table index. */ |
| 693 | if (i_ehdrp->e_shstrndx == (SHN_XINDEX & 0xffff)) |
| 694 | { |
| 695 | i_ehdrp->e_shstrndx = i_shdr.sh_link; |
| 696 | if (i_ehdrp->e_shstrndx != i_shdr.sh_link) |
| 697 | goto got_wrong_format_error; |
| 698 | } |
| 699 | |
| 700 | /* Sanity check that we can read all of the section headers. |
| 701 | It ought to be good enough to just read the last one. */ |
| 702 | if (i_ehdrp->e_shnum != 1) |
| 703 | { |
| 704 | /* Check that we don't have a totally silly number of sections. */ |
| 705 | if (i_ehdrp->e_shnum > (unsigned int) -1 / sizeof (x_shdr) |
| 706 | || i_ehdrp->e_shnum > (unsigned int) -1 / sizeof (i_shdr)) |
| 707 | goto got_wrong_format_error; |
| 708 | |
| 709 | where += (i_ehdrp->e_shnum - 1) * sizeof (x_shdr); |
| 710 | if (where != (file_ptr) where) |
| 711 | goto got_wrong_format_error; |
| 712 | if ((bfd_size_type) where <= i_ehdrp->e_shoff) |
| 713 | goto got_wrong_format_error; |
| 714 | |
| 715 | if (bfd_seek (abfd, (file_ptr) where, SEEK_SET) != 0) |
| 716 | goto got_no_match; |
| 717 | if (bfd_bread (&x_shdr, sizeof x_shdr, abfd) != sizeof (x_shdr)) |
| 718 | goto got_no_match; |
| 719 | |
| 720 | /* Back to where we were. */ |
| 721 | where = i_ehdrp->e_shoff + sizeof (x_shdr); |
| 722 | if (bfd_seek (abfd, (file_ptr) where, SEEK_SET) != 0) |
| 723 | goto got_no_match; |
| 724 | } |
| 725 | } |
| 726 | |
| 727 | /* Allocate space for a copy of the section header table in |
| 728 | internal form. */ |
| 729 | if (i_ehdrp->e_shnum != 0) |
| 730 | { |
| 731 | Elf_Internal_Shdr *shdrp; |
| 732 | unsigned int num_sec; |
| 733 | |
| 734 | amt = sizeof (*i_shdrp) * i_ehdrp->e_shnum; |
| 735 | i_shdrp = bfd_alloc (abfd, amt); |
| 736 | if (!i_shdrp) |
| 737 | goto got_no_match; |
| 738 | num_sec = i_ehdrp->e_shnum; |
| 739 | elf_numsections (abfd) = num_sec; |
| 740 | amt = sizeof (i_shdrp) * num_sec; |
| 741 | elf_elfsections (abfd) = bfd_alloc (abfd, amt); |
| 742 | if (!elf_elfsections (abfd)) |
| 743 | goto got_no_match; |
| 744 | |
| 745 | memcpy (i_shdrp, &i_shdr, sizeof (*i_shdrp)); |
| 746 | for (shdrp = i_shdrp, shindex = 0; shindex < num_sec; shindex++) |
| 747 | elf_elfsections (abfd)[shindex] = shdrp++; |
| 748 | |
| 749 | /* Read in the rest of the section header table and convert it |
| 750 | to internal form. */ |
| 751 | for (shindex = 1; shindex < i_ehdrp->e_shnum; shindex++) |
| 752 | { |
| 753 | if (bfd_bread (&x_shdr, sizeof x_shdr, abfd) != sizeof (x_shdr)) |
| 754 | goto got_no_match; |
| 755 | elf_swap_shdr_in (abfd, &x_shdr, i_shdrp + shindex); |
| 756 | |
| 757 | /* Sanity check sh_link and sh_info. */ |
| 758 | if (i_shdrp[shindex].sh_link >= num_sec) |
| 759 | goto got_wrong_format_error; |
| 760 | |
| 761 | if (((i_shdrp[shindex].sh_flags & SHF_INFO_LINK) |
| 762 | || i_shdrp[shindex].sh_type == SHT_RELA |
| 763 | || i_shdrp[shindex].sh_type == SHT_REL) |
| 764 | && i_shdrp[shindex].sh_info >= num_sec) |
| 765 | goto got_wrong_format_error; |
| 766 | |
| 767 | /* If the section is loaded, but not page aligned, clear |
| 768 | D_PAGED. */ |
| 769 | if (i_shdrp[shindex].sh_size != 0 |
| 770 | && (i_shdrp[shindex].sh_flags & SHF_ALLOC) != 0 |
| 771 | && i_shdrp[shindex].sh_type != SHT_NOBITS |
| 772 | && (((i_shdrp[shindex].sh_addr - i_shdrp[shindex].sh_offset) |
| 773 | % ebd->minpagesize) |
| 774 | != 0)) |
| 775 | abfd->flags &= ~D_PAGED; |
| 776 | } |
| 777 | } |
| 778 | |
| 779 | /* A further sanity check. */ |
| 780 | if (i_ehdrp->e_shnum != 0) |
| 781 | { |
| 782 | if (i_ehdrp->e_shstrndx >= elf_numsections (abfd)) |
| 783 | { |
| 784 | /* PR 2257: |
| 785 | We used to just goto got_wrong_format_error here |
| 786 | but there are binaries in existance for which this test |
| 787 | will prevent the binutils from working with them at all. |
| 788 | So we are kind, and reset the string index value to 0 |
| 789 | so that at least some processing can be done. */ |
| 790 | i_ehdrp->e_shstrndx = SHN_UNDEF; |
| 791 | _bfd_error_handler (_("warning: %s has a corrupt string table index - ignoring"), abfd->filename); |
| 792 | } |
| 793 | } |
| 794 | else if (i_ehdrp->e_shstrndx != SHN_UNDEF) |
| 795 | goto got_wrong_format_error; |
| 796 | |
| 797 | /* Read in the program headers. */ |
| 798 | if (i_ehdrp->e_phnum == 0) |
| 799 | elf_tdata (abfd)->phdr = NULL; |
| 800 | else |
| 801 | { |
| 802 | Elf_Internal_Phdr *i_phdr; |
| 803 | unsigned int i; |
| 804 | |
| 805 | amt = i_ehdrp->e_phnum * sizeof (Elf_Internal_Phdr); |
| 806 | elf_tdata (abfd)->phdr = bfd_alloc (abfd, amt); |
| 807 | if (elf_tdata (abfd)->phdr == NULL) |
| 808 | goto got_no_match; |
| 809 | if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_phoff, SEEK_SET) != 0) |
| 810 | goto got_no_match; |
| 811 | i_phdr = elf_tdata (abfd)->phdr; |
| 812 | for (i = 0; i < i_ehdrp->e_phnum; i++, i_phdr++) |
| 813 | { |
| 814 | Elf_External_Phdr x_phdr; |
| 815 | |
| 816 | if (bfd_bread (&x_phdr, sizeof x_phdr, abfd) != sizeof x_phdr) |
| 817 | goto got_no_match; |
| 818 | elf_swap_phdr_in (abfd, &x_phdr, i_phdr); |
| 819 | } |
| 820 | } |
| 821 | |
| 822 | if (i_ehdrp->e_shstrndx != 0 && i_ehdrp->e_shoff != 0) |
| 823 | { |
| 824 | unsigned int num_sec; |
| 825 | |
| 826 | /* Once all of the section headers have been read and converted, we |
| 827 | can start processing them. Note that the first section header is |
| 828 | a dummy placeholder entry, so we ignore it. */ |
| 829 | num_sec = elf_numsections (abfd); |
| 830 | for (shindex = 1; shindex < num_sec; shindex++) |
| 831 | if (!bfd_section_from_shdr (abfd, shindex)) |
| 832 | goto got_no_match; |
| 833 | |
| 834 | /* Set up ELF sections for SHF_GROUP and SHF_LINK_ORDER. */ |
| 835 | if (! _bfd_elf_setup_sections (abfd)) |
| 836 | goto got_wrong_format_error; |
| 837 | } |
| 838 | |
| 839 | /* Let the backend double check the format and override global |
| 840 | information. */ |
| 841 | if (ebd->elf_backend_object_p) |
| 842 | { |
| 843 | if (! (*ebd->elf_backend_object_p) (abfd)) |
| 844 | goto got_wrong_format_error; |
| 845 | } |
| 846 | |
| 847 | /* Remember the entry point specified in the ELF file header. */ |
| 848 | bfd_set_start_address (abfd, i_ehdrp->e_entry); |
| 849 | |
| 850 | /* If we have created any reloc sections that are associated with |
| 851 | debugging sections, mark the reloc sections as debugging as well. */ |
| 852 | for (s = abfd->sections; s != NULL; s = s->next) |
| 853 | { |
| 854 | if ((elf_section_data (s)->this_hdr.sh_type == SHT_REL |
| 855 | || elf_section_data (s)->this_hdr.sh_type == SHT_RELA) |
| 856 | && elf_section_data (s)->this_hdr.sh_info > 0) |
| 857 | { |
| 858 | unsigned long targ_index; |
| 859 | asection *targ_sec; |
| 860 | |
| 861 | targ_index = elf_section_data (s)->this_hdr.sh_info; |
| 862 | targ_sec = bfd_section_from_elf_index (abfd, targ_index); |
| 863 | if (targ_sec != NULL |
| 864 | && (targ_sec->flags & SEC_DEBUGGING) != 0) |
| 865 | s->flags |= SEC_DEBUGGING; |
| 866 | } |
| 867 | } |
| 868 | |
| 869 | bfd_preserve_finish (abfd, &preserve); |
| 870 | return target; |
| 871 | |
| 872 | got_wrong_format_error: |
| 873 | /* There is way too much undoing of half-known state here. The caller, |
| 874 | bfd_check_format_matches, really shouldn't iterate on live bfd's to |
| 875 | check match/no-match like it does. We have to rely on that a call to |
| 876 | bfd_default_set_arch_mach with the previously known mach, undoes what |
| 877 | was done by the first bfd_default_set_arch_mach (with mach 0) here. |
| 878 | For this to work, only elf-data and the mach may be changed by the |
| 879 | target-specific elf_backend_object_p function. Note that saving the |
| 880 | whole bfd here and restoring it would be even worse; the first thing |
| 881 | you notice is that the cached bfd file position gets out of sync. */ |
| 882 | bfd_set_error (bfd_error_wrong_format); |
| 883 | |
| 884 | got_no_match: |
| 885 | if (preserve.marker != NULL) |
| 886 | bfd_preserve_restore (abfd, &preserve); |
| 887 | return NULL; |
| 888 | } |
| 889 | \f |
| 890 | /* ELF .o/exec file writing */ |
| 891 | |
| 892 | /* Write out the relocs. */ |
| 893 | |
| 894 | void |
| 895 | elf_write_relocs (bfd *abfd, asection *sec, void *data) |
| 896 | { |
| 897 | bfd_boolean *failedp = data; |
| 898 | Elf_Internal_Shdr *rela_hdr; |
| 899 | bfd_vma addr_offset; |
| 900 | void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *); |
| 901 | size_t extsize; |
| 902 | bfd_byte *dst_rela; |
| 903 | unsigned int idx; |
| 904 | asymbol *last_sym; |
| 905 | int last_sym_idx; |
| 906 | |
| 907 | /* If we have already failed, don't do anything. */ |
| 908 | if (*failedp) |
| 909 | return; |
| 910 | |
| 911 | if ((sec->flags & SEC_RELOC) == 0) |
| 912 | return; |
| 913 | |
| 914 | /* The linker backend writes the relocs out itself, and sets the |
| 915 | reloc_count field to zero to inhibit writing them here. Also, |
| 916 | sometimes the SEC_RELOC flag gets set even when there aren't any |
| 917 | relocs. */ |
| 918 | if (sec->reloc_count == 0) |
| 919 | return; |
| 920 | |
| 921 | /* If we have opened an existing file for update, reloc_count may be |
| 922 | set even though we are not linking. In that case we have nothing |
| 923 | to do. */ |
| 924 | if (sec->orelocation == NULL) |
| 925 | return; |
| 926 | |
| 927 | rela_hdr = &elf_section_data (sec)->rel_hdr; |
| 928 | |
| 929 | rela_hdr->sh_size = rela_hdr->sh_entsize * sec->reloc_count; |
| 930 | rela_hdr->contents = bfd_alloc (abfd, rela_hdr->sh_size); |
| 931 | if (rela_hdr->contents == NULL) |
| 932 | { |
| 933 | *failedp = TRUE; |
| 934 | return; |
| 935 | } |
| 936 | |
| 937 | /* Figure out whether the relocations are RELA or REL relocations. */ |
| 938 | if (rela_hdr->sh_type == SHT_RELA) |
| 939 | { |
| 940 | swap_out = elf_swap_reloca_out; |
| 941 | extsize = sizeof (Elf_External_Rela); |
| 942 | } |
| 943 | else if (rela_hdr->sh_type == SHT_REL) |
| 944 | { |
| 945 | swap_out = elf_swap_reloc_out; |
| 946 | extsize = sizeof (Elf_External_Rel); |
| 947 | } |
| 948 | else |
| 949 | /* Every relocation section should be either an SHT_RELA or an |
| 950 | SHT_REL section. */ |
| 951 | abort (); |
| 952 | |
| 953 | /* The address of an ELF reloc is section relative for an object |
| 954 | file, and absolute for an executable file or shared library. |
| 955 | The address of a BFD reloc is always section relative. */ |
| 956 | addr_offset = 0; |
| 957 | if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0) |
| 958 | addr_offset = sec->vma; |
| 959 | |
| 960 | /* orelocation has the data, reloc_count has the count... */ |
| 961 | last_sym = 0; |
| 962 | last_sym_idx = 0; |
| 963 | dst_rela = rela_hdr->contents; |
| 964 | |
| 965 | for (idx = 0; idx < sec->reloc_count; idx++, dst_rela += extsize) |
| 966 | { |
| 967 | Elf_Internal_Rela src_rela; |
| 968 | arelent *ptr; |
| 969 | asymbol *sym; |
| 970 | int n; |
| 971 | |
| 972 | ptr = sec->orelocation[idx]; |
| 973 | sym = *ptr->sym_ptr_ptr; |
| 974 | if (sym == last_sym) |
| 975 | n = last_sym_idx; |
| 976 | else if (bfd_is_abs_section (sym->section) && sym->value == 0) |
| 977 | n = STN_UNDEF; |
| 978 | else |
| 979 | { |
| 980 | last_sym = sym; |
| 981 | n = _bfd_elf_symbol_from_bfd_symbol (abfd, &sym); |
| 982 | if (n < 0) |
| 983 | { |
| 984 | *failedp = TRUE; |
| 985 | return; |
| 986 | } |
| 987 | last_sym_idx = n; |
| 988 | } |
| 989 | |
| 990 | if ((*ptr->sym_ptr_ptr)->the_bfd != NULL |
| 991 | && (*ptr->sym_ptr_ptr)->the_bfd->xvec != abfd->xvec |
| 992 | && ! _bfd_elf_validate_reloc (abfd, ptr)) |
| 993 | { |
| 994 | *failedp = TRUE; |
| 995 | return; |
| 996 | } |
| 997 | |
| 998 | src_rela.r_offset = ptr->address + addr_offset; |
| 999 | src_rela.r_info = ELF_R_INFO (n, ptr->howto->type); |
| 1000 | src_rela.r_addend = ptr->addend; |
| 1001 | (*swap_out) (abfd, &src_rela, dst_rela); |
| 1002 | } |
| 1003 | } |
| 1004 | |
| 1005 | /* Write out the program headers. */ |
| 1006 | |
| 1007 | int |
| 1008 | elf_write_out_phdrs (bfd *abfd, |
| 1009 | const Elf_Internal_Phdr *phdr, |
| 1010 | unsigned int count) |
| 1011 | { |
| 1012 | while (count--) |
| 1013 | { |
| 1014 | Elf_External_Phdr extphdr; |
| 1015 | elf_swap_phdr_out (abfd, phdr, &extphdr); |
| 1016 | if (bfd_bwrite (&extphdr, sizeof (Elf_External_Phdr), abfd) |
| 1017 | != sizeof (Elf_External_Phdr)) |
| 1018 | return -1; |
| 1019 | phdr++; |
| 1020 | } |
| 1021 | return 0; |
| 1022 | } |
| 1023 | |
| 1024 | /* Write out the section headers and the ELF file header. */ |
| 1025 | |
| 1026 | bfd_boolean |
| 1027 | elf_write_shdrs_and_ehdr (bfd *abfd) |
| 1028 | { |
| 1029 | Elf_External_Ehdr x_ehdr; /* Elf file header, external form */ |
| 1030 | Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */ |
| 1031 | Elf_External_Shdr *x_shdrp; /* Section header table, external form */ |
| 1032 | Elf_Internal_Shdr **i_shdrp; /* Section header table, internal form */ |
| 1033 | unsigned int count; |
| 1034 | bfd_size_type amt; |
| 1035 | |
| 1036 | i_ehdrp = elf_elfheader (abfd); |
| 1037 | i_shdrp = elf_elfsections (abfd); |
| 1038 | |
| 1039 | /* swap the header before spitting it out... */ |
| 1040 | |
| 1041 | #if DEBUG & 1 |
| 1042 | elf_debug_file (i_ehdrp); |
| 1043 | #endif |
| 1044 | elf_swap_ehdr_out (abfd, i_ehdrp, &x_ehdr); |
| 1045 | amt = sizeof (x_ehdr); |
| 1046 | if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0 |
| 1047 | || bfd_bwrite (&x_ehdr, amt, abfd) != amt) |
| 1048 | return FALSE; |
| 1049 | |
| 1050 | /* Some fields in the first section header handle overflow of ehdr |
| 1051 | fields. */ |
| 1052 | if (i_ehdrp->e_shnum >= (SHN_LORESERVE & 0xffff)) |
| 1053 | i_shdrp[0]->sh_size = i_ehdrp->e_shnum; |
| 1054 | if (i_ehdrp->e_shstrndx >= (SHN_LORESERVE & 0xffff)) |
| 1055 | i_shdrp[0]->sh_link = i_ehdrp->e_shstrndx; |
| 1056 | |
| 1057 | /* at this point we've concocted all the ELF sections... */ |
| 1058 | amt = i_ehdrp->e_shnum; |
| 1059 | amt *= sizeof (*x_shdrp); |
| 1060 | x_shdrp = bfd_alloc (abfd, amt); |
| 1061 | if (!x_shdrp) |
| 1062 | return FALSE; |
| 1063 | |
| 1064 | for (count = 0; count < i_ehdrp->e_shnum; i_shdrp++, count++) |
| 1065 | { |
| 1066 | #if DEBUG & 2 |
| 1067 | elf_debug_section (count, *i_shdrp); |
| 1068 | #endif |
| 1069 | elf_swap_shdr_out (abfd, *i_shdrp, x_shdrp + count); |
| 1070 | } |
| 1071 | if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_shoff, SEEK_SET) != 0 |
| 1072 | || bfd_bwrite (x_shdrp, amt, abfd) != amt) |
| 1073 | return FALSE; |
| 1074 | |
| 1075 | /* need to dump the string table too... */ |
| 1076 | |
| 1077 | return TRUE; |
| 1078 | } |
| 1079 | |
| 1080 | bfd_boolean |
| 1081 | elf_checksum_contents (bfd *abfd, |
| 1082 | void (*process) (const void *, size_t, void *), |
| 1083 | void *arg) |
| 1084 | { |
| 1085 | Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd); |
| 1086 | Elf_Internal_Shdr **i_shdrp = elf_elfsections (abfd); |
| 1087 | Elf_Internal_Phdr *i_phdrp = elf_tdata (abfd)->phdr; |
| 1088 | unsigned int count, num; |
| 1089 | |
| 1090 | { |
| 1091 | Elf_External_Ehdr x_ehdr; |
| 1092 | Elf_Internal_Ehdr i_ehdr; |
| 1093 | |
| 1094 | i_ehdr = *i_ehdrp; |
| 1095 | i_ehdr.e_phoff = i_ehdr.e_shoff = 0; |
| 1096 | elf_swap_ehdr_out (abfd, &i_ehdr, &x_ehdr); |
| 1097 | (*process) (&x_ehdr, sizeof x_ehdr, arg); |
| 1098 | } |
| 1099 | |
| 1100 | num = i_ehdrp->e_phnum; |
| 1101 | for (count = 0; count < num; count++) |
| 1102 | { |
| 1103 | Elf_External_Phdr x_phdr; |
| 1104 | elf_swap_phdr_out (abfd, &i_phdrp[count], &x_phdr); |
| 1105 | (*process) (&x_phdr, sizeof x_phdr, arg); |
| 1106 | } |
| 1107 | |
| 1108 | num = elf_numsections (abfd); |
| 1109 | for (count = 0; count < num; count++) |
| 1110 | { |
| 1111 | Elf_Internal_Shdr i_shdr; |
| 1112 | Elf_External_Shdr x_shdr; |
| 1113 | |
| 1114 | i_shdr = *i_shdrp[count]; |
| 1115 | i_shdr.sh_offset = 0; |
| 1116 | |
| 1117 | elf_swap_shdr_out (abfd, &i_shdr, &x_shdr); |
| 1118 | (*process) (&x_shdr, sizeof x_shdr, arg); |
| 1119 | |
| 1120 | if (i_shdr.contents) |
| 1121 | (*process) (i_shdr.contents, i_shdr.sh_size, arg); |
| 1122 | } |
| 1123 | |
| 1124 | return TRUE; |
| 1125 | } |
| 1126 | |
| 1127 | long |
| 1128 | elf_slurp_symbol_table (bfd *abfd, asymbol **symptrs, bfd_boolean dynamic) |
| 1129 | { |
| 1130 | Elf_Internal_Shdr *hdr; |
| 1131 | Elf_Internal_Shdr *verhdr; |
| 1132 | unsigned long symcount; /* Number of external ELF symbols */ |
| 1133 | elf_symbol_type *sym; /* Pointer to current bfd symbol */ |
| 1134 | elf_symbol_type *symbase; /* Buffer for generated bfd symbols */ |
| 1135 | Elf_Internal_Sym *isym; |
| 1136 | Elf_Internal_Sym *isymend; |
| 1137 | Elf_Internal_Sym *isymbuf = NULL; |
| 1138 | Elf_External_Versym *xver; |
| 1139 | Elf_External_Versym *xverbuf = NULL; |
| 1140 | const struct elf_backend_data *ebd; |
| 1141 | bfd_size_type amt; |
| 1142 | |
| 1143 | /* Read each raw ELF symbol, converting from external ELF form to |
| 1144 | internal ELF form, and then using the information to create a |
| 1145 | canonical bfd symbol table entry. |
| 1146 | |
| 1147 | Note that we allocate the initial bfd canonical symbol buffer |
| 1148 | based on a one-to-one mapping of the ELF symbols to canonical |
| 1149 | symbols. We actually use all the ELF symbols, so there will be no |
| 1150 | space left over at the end. When we have all the symbols, we |
| 1151 | build the caller's pointer vector. */ |
| 1152 | |
| 1153 | if (! dynamic) |
| 1154 | { |
| 1155 | hdr = &elf_tdata (abfd)->symtab_hdr; |
| 1156 | verhdr = NULL; |
| 1157 | } |
| 1158 | else |
| 1159 | { |
| 1160 | hdr = &elf_tdata (abfd)->dynsymtab_hdr; |
| 1161 | if (elf_dynversym (abfd) == 0) |
| 1162 | verhdr = NULL; |
| 1163 | else |
| 1164 | verhdr = &elf_tdata (abfd)->dynversym_hdr; |
| 1165 | if ((elf_tdata (abfd)->dynverdef_section != 0 |
| 1166 | && elf_tdata (abfd)->verdef == NULL) |
| 1167 | || (elf_tdata (abfd)->dynverref_section != 0 |
| 1168 | && elf_tdata (abfd)->verref == NULL)) |
| 1169 | { |
| 1170 | if (!_bfd_elf_slurp_version_tables (abfd, FALSE)) |
| 1171 | return -1; |
| 1172 | } |
| 1173 | } |
| 1174 | |
| 1175 | ebd = get_elf_backend_data (abfd); |
| 1176 | symcount = hdr->sh_size / sizeof (Elf_External_Sym); |
| 1177 | if (symcount == 0) |
| 1178 | sym = symbase = NULL; |
| 1179 | else |
| 1180 | { |
| 1181 | isymbuf = bfd_elf_get_elf_syms (abfd, hdr, symcount, 0, |
| 1182 | NULL, NULL, NULL); |
| 1183 | if (isymbuf == NULL) |
| 1184 | return -1; |
| 1185 | |
| 1186 | amt = symcount; |
| 1187 | amt *= sizeof (elf_symbol_type); |
| 1188 | symbase = bfd_zalloc (abfd, amt); |
| 1189 | if (symbase == (elf_symbol_type *) NULL) |
| 1190 | goto error_return; |
| 1191 | |
| 1192 | /* Read the raw ELF version symbol information. */ |
| 1193 | if (verhdr != NULL |
| 1194 | && verhdr->sh_size / sizeof (Elf_External_Versym) != symcount) |
| 1195 | { |
| 1196 | (*_bfd_error_handler) |
| 1197 | (_("%s: version count (%ld) does not match symbol count (%ld)"), |
| 1198 | abfd->filename, |
| 1199 | (long) (verhdr->sh_size / sizeof (Elf_External_Versym)), |
| 1200 | symcount); |
| 1201 | |
| 1202 | /* Slurp in the symbols without the version information, |
| 1203 | since that is more helpful than just quitting. */ |
| 1204 | verhdr = NULL; |
| 1205 | } |
| 1206 | |
| 1207 | if (verhdr != NULL) |
| 1208 | { |
| 1209 | if (bfd_seek (abfd, verhdr->sh_offset, SEEK_SET) != 0) |
| 1210 | goto error_return; |
| 1211 | |
| 1212 | xverbuf = bfd_malloc (verhdr->sh_size); |
| 1213 | if (xverbuf == NULL && verhdr->sh_size != 0) |
| 1214 | goto error_return; |
| 1215 | |
| 1216 | if (bfd_bread (xverbuf, verhdr->sh_size, abfd) != verhdr->sh_size) |
| 1217 | goto error_return; |
| 1218 | } |
| 1219 | |
| 1220 | /* Skip first symbol, which is a null dummy. */ |
| 1221 | xver = xverbuf; |
| 1222 | if (xver != NULL) |
| 1223 | ++xver; |
| 1224 | isymend = isymbuf + symcount; |
| 1225 | for (isym = isymbuf + 1, sym = symbase; isym < isymend; isym++, sym++) |
| 1226 | { |
| 1227 | memcpy (&sym->internal_elf_sym, isym, sizeof (Elf_Internal_Sym)); |
| 1228 | sym->symbol.the_bfd = abfd; |
| 1229 | |
| 1230 | sym->symbol.name = bfd_elf_sym_name (abfd, hdr, isym, NULL); |
| 1231 | |
| 1232 | sym->symbol.value = isym->st_value; |
| 1233 | |
| 1234 | if (isym->st_shndx == SHN_UNDEF) |
| 1235 | { |
| 1236 | sym->symbol.section = bfd_und_section_ptr; |
| 1237 | } |
| 1238 | else if (isym->st_shndx == SHN_ABS) |
| 1239 | { |
| 1240 | sym->symbol.section = bfd_abs_section_ptr; |
| 1241 | } |
| 1242 | else if (isym->st_shndx == SHN_COMMON) |
| 1243 | { |
| 1244 | sym->symbol.section = bfd_com_section_ptr; |
| 1245 | /* Elf puts the alignment into the `value' field, and |
| 1246 | the size into the `size' field. BFD wants to see the |
| 1247 | size in the value field, and doesn't care (at the |
| 1248 | moment) about the alignment. */ |
| 1249 | sym->symbol.value = isym->st_size; |
| 1250 | } |
| 1251 | else |
| 1252 | { |
| 1253 | sym->symbol.section |
| 1254 | = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| 1255 | if (sym->symbol.section == NULL) |
| 1256 | { |
| 1257 | /* This symbol is in a section for which we did not |
| 1258 | create a BFD section. Just use bfd_abs_section, |
| 1259 | although it is wrong. FIXME. */ |
| 1260 | sym->symbol.section = bfd_abs_section_ptr; |
| 1261 | } |
| 1262 | } |
| 1263 | |
| 1264 | /* If this is a relocatable file, then the symbol value is |
| 1265 | already section relative. */ |
| 1266 | if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0) |
| 1267 | sym->symbol.value -= sym->symbol.section->vma; |
| 1268 | |
| 1269 | switch (ELF_ST_BIND (isym->st_info)) |
| 1270 | { |
| 1271 | case STB_LOCAL: |
| 1272 | sym->symbol.flags |= BSF_LOCAL; |
| 1273 | break; |
| 1274 | case STB_GLOBAL: |
| 1275 | if (isym->st_shndx != SHN_UNDEF && isym->st_shndx != SHN_COMMON) |
| 1276 | sym->symbol.flags |= BSF_GLOBAL; |
| 1277 | break; |
| 1278 | case STB_WEAK: |
| 1279 | sym->symbol.flags |= BSF_WEAK; |
| 1280 | break; |
| 1281 | } |
| 1282 | |
| 1283 | switch (ELF_ST_TYPE (isym->st_info)) |
| 1284 | { |
| 1285 | case STT_SECTION: |
| 1286 | sym->symbol.flags |= BSF_SECTION_SYM | BSF_DEBUGGING; |
| 1287 | break; |
| 1288 | case STT_FILE: |
| 1289 | sym->symbol.flags |= BSF_FILE | BSF_DEBUGGING; |
| 1290 | break; |
| 1291 | case STT_FUNC: |
| 1292 | sym->symbol.flags |= BSF_FUNCTION; |
| 1293 | break; |
| 1294 | case STT_COMMON: |
| 1295 | /* FIXME: Do we have to put the size field into the value field |
| 1296 | as we do with symbols in SHN_COMMON sections (see above) ? */ |
| 1297 | /* Fall through. */ |
| 1298 | case STT_OBJECT: |
| 1299 | sym->symbol.flags |= BSF_OBJECT; |
| 1300 | break; |
| 1301 | case STT_TLS: |
| 1302 | sym->symbol.flags |= BSF_THREAD_LOCAL; |
| 1303 | break; |
| 1304 | case STT_RELC: |
| 1305 | sym->symbol.flags |= BSF_RELC; |
| 1306 | break; |
| 1307 | case STT_SRELC: |
| 1308 | sym->symbol.flags |= BSF_SRELC; |
| 1309 | break; |
| 1310 | } |
| 1311 | |
| 1312 | if (dynamic) |
| 1313 | sym->symbol.flags |= BSF_DYNAMIC; |
| 1314 | |
| 1315 | if (xver != NULL) |
| 1316 | { |
| 1317 | Elf_Internal_Versym iversym; |
| 1318 | |
| 1319 | _bfd_elf_swap_versym_in (abfd, xver, &iversym); |
| 1320 | sym->version = iversym.vs_vers; |
| 1321 | xver++; |
| 1322 | } |
| 1323 | |
| 1324 | /* Do some backend-specific processing on this symbol. */ |
| 1325 | if (ebd->elf_backend_symbol_processing) |
| 1326 | (*ebd->elf_backend_symbol_processing) (abfd, &sym->symbol); |
| 1327 | } |
| 1328 | } |
| 1329 | |
| 1330 | /* Do some backend-specific processing on this symbol table. */ |
| 1331 | if (ebd->elf_backend_symbol_table_processing) |
| 1332 | (*ebd->elf_backend_symbol_table_processing) (abfd, symbase, symcount); |
| 1333 | |
| 1334 | /* We rely on the zalloc to clear out the final symbol entry. */ |
| 1335 | |
| 1336 | symcount = sym - symbase; |
| 1337 | |
| 1338 | /* Fill in the user's symbol pointer vector if needed. */ |
| 1339 | if (symptrs) |
| 1340 | { |
| 1341 | long l = symcount; |
| 1342 | |
| 1343 | sym = symbase; |
| 1344 | while (l-- > 0) |
| 1345 | { |
| 1346 | *symptrs++ = &sym->symbol; |
| 1347 | sym++; |
| 1348 | } |
| 1349 | *symptrs = 0; /* Final null pointer */ |
| 1350 | } |
| 1351 | |
| 1352 | if (xverbuf != NULL) |
| 1353 | free (xverbuf); |
| 1354 | if (isymbuf != NULL && hdr->contents != (unsigned char *) isymbuf) |
| 1355 | free (isymbuf); |
| 1356 | return symcount; |
| 1357 | |
| 1358 | error_return: |
| 1359 | if (xverbuf != NULL) |
| 1360 | free (xverbuf); |
| 1361 | if (isymbuf != NULL && hdr->contents != (unsigned char *) isymbuf) |
| 1362 | free (isymbuf); |
| 1363 | return -1; |
| 1364 | } |
| 1365 | |
| 1366 | /* Read relocations for ASECT from REL_HDR. There are RELOC_COUNT of |
| 1367 | them. */ |
| 1368 | |
| 1369 | static bfd_boolean |
| 1370 | elf_slurp_reloc_table_from_section (bfd *abfd, |
| 1371 | asection *asect, |
| 1372 | Elf_Internal_Shdr *rel_hdr, |
| 1373 | bfd_size_type reloc_count, |
| 1374 | arelent *relents, |
| 1375 | asymbol **symbols, |
| 1376 | bfd_boolean dynamic) |
| 1377 | { |
| 1378 | const struct elf_backend_data * const ebd = get_elf_backend_data (abfd); |
| 1379 | void *allocated = NULL; |
| 1380 | bfd_byte *native_relocs; |
| 1381 | arelent *relent; |
| 1382 | unsigned int i; |
| 1383 | int entsize; |
| 1384 | unsigned int symcount; |
| 1385 | |
| 1386 | allocated = bfd_malloc (rel_hdr->sh_size); |
| 1387 | if (allocated == NULL) |
| 1388 | goto error_return; |
| 1389 | |
| 1390 | if (bfd_seek (abfd, rel_hdr->sh_offset, SEEK_SET) != 0 |
| 1391 | || (bfd_bread (allocated, rel_hdr->sh_size, abfd) |
| 1392 | != rel_hdr->sh_size)) |
| 1393 | goto error_return; |
| 1394 | |
| 1395 | native_relocs = allocated; |
| 1396 | |
| 1397 | entsize = rel_hdr->sh_entsize; |
| 1398 | BFD_ASSERT (entsize == sizeof (Elf_External_Rel) |
| 1399 | || entsize == sizeof (Elf_External_Rela)); |
| 1400 | |
| 1401 | if (dynamic) |
| 1402 | symcount = bfd_get_dynamic_symcount (abfd); |
| 1403 | else |
| 1404 | symcount = bfd_get_symcount (abfd); |
| 1405 | |
| 1406 | for (i = 0, relent = relents; |
| 1407 | i < reloc_count; |
| 1408 | i++, relent++, native_relocs += entsize) |
| 1409 | { |
| 1410 | Elf_Internal_Rela rela; |
| 1411 | |
| 1412 | if (entsize == sizeof (Elf_External_Rela)) |
| 1413 | elf_swap_reloca_in (abfd, native_relocs, &rela); |
| 1414 | else |
| 1415 | elf_swap_reloc_in (abfd, native_relocs, &rela); |
| 1416 | |
| 1417 | /* The address of an ELF reloc is section relative for an object |
| 1418 | file, and absolute for an executable file or shared library. |
| 1419 | The address of a normal BFD reloc is always section relative, |
| 1420 | and the address of a dynamic reloc is absolute.. */ |
| 1421 | if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0 || dynamic) |
| 1422 | relent->address = rela.r_offset; |
| 1423 | else |
| 1424 | relent->address = rela.r_offset - asect->vma; |
| 1425 | |
| 1426 | if (ELF_R_SYM (rela.r_info) == 0) |
| 1427 | relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr; |
| 1428 | else if (ELF_R_SYM (rela.r_info) > symcount) |
| 1429 | { |
| 1430 | (*_bfd_error_handler) |
| 1431 | (_("%s(%s): relocation %d has invalid symbol index %ld"), |
| 1432 | abfd->filename, asect->name, i, ELF_R_SYM (rela.r_info)); |
| 1433 | relent->sym_ptr_ptr = bfd_abs_section.symbol_ptr_ptr; |
| 1434 | } |
| 1435 | else |
| 1436 | { |
| 1437 | asymbol **ps; |
| 1438 | |
| 1439 | ps = symbols + ELF_R_SYM (rela.r_info) - 1; |
| 1440 | |
| 1441 | relent->sym_ptr_ptr = ps; |
| 1442 | } |
| 1443 | |
| 1444 | relent->addend = rela.r_addend; |
| 1445 | |
| 1446 | if ((entsize == sizeof (Elf_External_Rela) |
| 1447 | && ebd->elf_info_to_howto != NULL) |
| 1448 | || ebd->elf_info_to_howto_rel == NULL) |
| 1449 | (*ebd->elf_info_to_howto) (abfd, relent, &rela); |
| 1450 | else |
| 1451 | (*ebd->elf_info_to_howto_rel) (abfd, relent, &rela); |
| 1452 | } |
| 1453 | |
| 1454 | if (allocated != NULL) |
| 1455 | free (allocated); |
| 1456 | |
| 1457 | return TRUE; |
| 1458 | |
| 1459 | error_return: |
| 1460 | if (allocated != NULL) |
| 1461 | free (allocated); |
| 1462 | return FALSE; |
| 1463 | } |
| 1464 | |
| 1465 | /* Read in and swap the external relocs. */ |
| 1466 | |
| 1467 | bfd_boolean |
| 1468 | elf_slurp_reloc_table (bfd *abfd, |
| 1469 | asection *asect, |
| 1470 | asymbol **symbols, |
| 1471 | bfd_boolean dynamic) |
| 1472 | { |
| 1473 | struct bfd_elf_section_data * const d = elf_section_data (asect); |
| 1474 | Elf_Internal_Shdr *rel_hdr; |
| 1475 | Elf_Internal_Shdr *rel_hdr2; |
| 1476 | bfd_size_type reloc_count; |
| 1477 | bfd_size_type reloc_count2; |
| 1478 | arelent *relents; |
| 1479 | bfd_size_type amt; |
| 1480 | |
| 1481 | if (asect->relocation != NULL) |
| 1482 | return TRUE; |
| 1483 | |
| 1484 | if (! dynamic) |
| 1485 | { |
| 1486 | if ((asect->flags & SEC_RELOC) == 0 |
| 1487 | || asect->reloc_count == 0) |
| 1488 | return TRUE; |
| 1489 | |
| 1490 | rel_hdr = &d->rel_hdr; |
| 1491 | reloc_count = NUM_SHDR_ENTRIES (rel_hdr); |
| 1492 | rel_hdr2 = d->rel_hdr2; |
| 1493 | reloc_count2 = (rel_hdr2 ? NUM_SHDR_ENTRIES (rel_hdr2) : 0); |
| 1494 | |
| 1495 | BFD_ASSERT (asect->reloc_count == reloc_count + reloc_count2); |
| 1496 | BFD_ASSERT (asect->rel_filepos == rel_hdr->sh_offset |
| 1497 | || (rel_hdr2 && asect->rel_filepos == rel_hdr2->sh_offset)); |
| 1498 | |
| 1499 | } |
| 1500 | else |
| 1501 | { |
| 1502 | /* Note that ASECT->RELOC_COUNT tends not to be accurate in this |
| 1503 | case because relocations against this section may use the |
| 1504 | dynamic symbol table, and in that case bfd_section_from_shdr |
| 1505 | in elf.c does not update the RELOC_COUNT. */ |
| 1506 | if (asect->size == 0) |
| 1507 | return TRUE; |
| 1508 | |
| 1509 | rel_hdr = &d->this_hdr; |
| 1510 | reloc_count = NUM_SHDR_ENTRIES (rel_hdr); |
| 1511 | rel_hdr2 = NULL; |
| 1512 | reloc_count2 = 0; |
| 1513 | } |
| 1514 | |
| 1515 | amt = (reloc_count + reloc_count2) * sizeof (arelent); |
| 1516 | relents = bfd_alloc (abfd, amt); |
| 1517 | if (relents == NULL) |
| 1518 | return FALSE; |
| 1519 | |
| 1520 | if (!elf_slurp_reloc_table_from_section (abfd, asect, |
| 1521 | rel_hdr, reloc_count, |
| 1522 | relents, |
| 1523 | symbols, dynamic)) |
| 1524 | return FALSE; |
| 1525 | |
| 1526 | if (rel_hdr2 |
| 1527 | && !elf_slurp_reloc_table_from_section (abfd, asect, |
| 1528 | rel_hdr2, reloc_count2, |
| 1529 | relents + reloc_count, |
| 1530 | symbols, dynamic)) |
| 1531 | return FALSE; |
| 1532 | |
| 1533 | asect->relocation = relents; |
| 1534 | return TRUE; |
| 1535 | } |
| 1536 | |
| 1537 | #if DEBUG & 2 |
| 1538 | static void |
| 1539 | elf_debug_section (int num, Elf_Internal_Shdr *hdr) |
| 1540 | { |
| 1541 | fprintf (stderr, "\nSection#%d '%s' 0x%.8lx\n", num, |
| 1542 | hdr->bfd_section != NULL ? hdr->bfd_section->name : "", |
| 1543 | (long) hdr); |
| 1544 | fprintf (stderr, |
| 1545 | "sh_name = %ld\tsh_type = %ld\tsh_flags = %ld\n", |
| 1546 | (long) hdr->sh_name, |
| 1547 | (long) hdr->sh_type, |
| 1548 | (long) hdr->sh_flags); |
| 1549 | fprintf (stderr, |
| 1550 | "sh_addr = %ld\tsh_offset = %ld\tsh_size = %ld\n", |
| 1551 | (long) hdr->sh_addr, |
| 1552 | (long) hdr->sh_offset, |
| 1553 | (long) hdr->sh_size); |
| 1554 | fprintf (stderr, |
| 1555 | "sh_link = %ld\tsh_info = %ld\tsh_addralign = %ld\n", |
| 1556 | (long) hdr->sh_link, |
| 1557 | (long) hdr->sh_info, |
| 1558 | (long) hdr->sh_addralign); |
| 1559 | fprintf (stderr, "sh_entsize = %ld\n", |
| 1560 | (long) hdr->sh_entsize); |
| 1561 | fflush (stderr); |
| 1562 | } |
| 1563 | #endif |
| 1564 | |
| 1565 | #if DEBUG & 1 |
| 1566 | static void |
| 1567 | elf_debug_file (Elf_Internal_Ehdr *ehdrp) |
| 1568 | { |
| 1569 | fprintf (stderr, "e_entry = 0x%.8lx\n", (long) ehdrp->e_entry); |
| 1570 | fprintf (stderr, "e_phoff = %ld\n", (long) ehdrp->e_phoff); |
| 1571 | fprintf (stderr, "e_phnum = %ld\n", (long) ehdrp->e_phnum); |
| 1572 | fprintf (stderr, "e_phentsize = %ld\n", (long) ehdrp->e_phentsize); |
| 1573 | fprintf (stderr, "e_shoff = %ld\n", (long) ehdrp->e_shoff); |
| 1574 | fprintf (stderr, "e_shnum = %ld\n", (long) ehdrp->e_shnum); |
| 1575 | fprintf (stderr, "e_shentsize = %ld\n", (long) ehdrp->e_shentsize); |
| 1576 | } |
| 1577 | #endif |
| 1578 | \f |
| 1579 | /* Create a new BFD as if by bfd_openr. Rather than opening a file, |
| 1580 | reconstruct an ELF file by reading the segments out of remote memory |
| 1581 | based on the ELF file header at EHDR_VMA and the ELF program headers it |
| 1582 | points to. If not null, *LOADBASEP is filled in with the difference |
| 1583 | between the VMAs from which the segments were read, and the VMAs the |
| 1584 | file headers (and hence BFD's idea of each section's VMA) put them at. |
| 1585 | |
| 1586 | The function TARGET_READ_MEMORY is called to copy LEN bytes from the |
| 1587 | remote memory at target address VMA into the local buffer at MYADDR; it |
| 1588 | should return zero on success or an `errno' code on failure. TEMPL must |
| 1589 | be a BFD for a target with the word size and byte order found in the |
| 1590 | remote memory. */ |
| 1591 | |
| 1592 | bfd * |
| 1593 | NAME(_bfd_elf,bfd_from_remote_memory) |
| 1594 | (bfd *templ, |
| 1595 | bfd_vma ehdr_vma, |
| 1596 | bfd_vma *loadbasep, |
| 1597 | int (*target_read_memory) (bfd_vma, bfd_byte *, int)) |
| 1598 | { |
| 1599 | Elf_External_Ehdr x_ehdr; /* Elf file header, external form */ |
| 1600 | Elf_Internal_Ehdr i_ehdr; /* Elf file header, internal form */ |
| 1601 | Elf_External_Phdr *x_phdrs; |
| 1602 | Elf_Internal_Phdr *i_phdrs, *last_phdr; |
| 1603 | bfd *nbfd; |
| 1604 | struct bfd_in_memory *bim; |
| 1605 | int contents_size; |
| 1606 | bfd_byte *contents; |
| 1607 | int err; |
| 1608 | unsigned int i; |
| 1609 | bfd_vma loadbase; |
| 1610 | bfd_boolean loadbase_set; |
| 1611 | |
| 1612 | /* Read in the ELF header in external format. */ |
| 1613 | err = target_read_memory (ehdr_vma, (bfd_byte *) &x_ehdr, sizeof x_ehdr); |
| 1614 | if (err) |
| 1615 | { |
| 1616 | bfd_set_error (bfd_error_system_call); |
| 1617 | errno = err; |
| 1618 | return NULL; |
| 1619 | } |
| 1620 | |
| 1621 | /* Now check to see if we have a valid ELF file, and one that BFD can |
| 1622 | make use of. The magic number must match, the address size ('class') |
| 1623 | and byte-swapping must match our XVEC entry. */ |
| 1624 | |
| 1625 | if (! elf_file_p (&x_ehdr) |
| 1626 | || x_ehdr.e_ident[EI_VERSION] != EV_CURRENT |
| 1627 | || x_ehdr.e_ident[EI_CLASS] != ELFCLASS) |
| 1628 | { |
| 1629 | bfd_set_error (bfd_error_wrong_format); |
| 1630 | return NULL; |
| 1631 | } |
| 1632 | |
| 1633 | /* Check that file's byte order matches xvec's */ |
| 1634 | switch (x_ehdr.e_ident[EI_DATA]) |
| 1635 | { |
| 1636 | case ELFDATA2MSB: /* Big-endian */ |
| 1637 | if (! bfd_header_big_endian (templ)) |
| 1638 | { |
| 1639 | bfd_set_error (bfd_error_wrong_format); |
| 1640 | return NULL; |
| 1641 | } |
| 1642 | break; |
| 1643 | case ELFDATA2LSB: /* Little-endian */ |
| 1644 | if (! bfd_header_little_endian (templ)) |
| 1645 | { |
| 1646 | bfd_set_error (bfd_error_wrong_format); |
| 1647 | return NULL; |
| 1648 | } |
| 1649 | break; |
| 1650 | case ELFDATANONE: /* No data encoding specified */ |
| 1651 | default: /* Unknown data encoding specified */ |
| 1652 | bfd_set_error (bfd_error_wrong_format); |
| 1653 | return NULL; |
| 1654 | } |
| 1655 | |
| 1656 | elf_swap_ehdr_in (templ, &x_ehdr, &i_ehdr); |
| 1657 | |
| 1658 | /* The file header tells where to find the program headers. |
| 1659 | These are what we use to actually choose what to read. */ |
| 1660 | |
| 1661 | if (i_ehdr.e_phentsize != sizeof (Elf_External_Phdr) || i_ehdr.e_phnum == 0) |
| 1662 | { |
| 1663 | bfd_set_error (bfd_error_wrong_format); |
| 1664 | return NULL; |
| 1665 | } |
| 1666 | |
| 1667 | x_phdrs = bfd_malloc (i_ehdr.e_phnum * (sizeof *x_phdrs + sizeof *i_phdrs)); |
| 1668 | if (x_phdrs == NULL) |
| 1669 | { |
| 1670 | bfd_set_error (bfd_error_no_memory); |
| 1671 | return NULL; |
| 1672 | } |
| 1673 | err = target_read_memory (ehdr_vma + i_ehdr.e_phoff, (bfd_byte *) x_phdrs, |
| 1674 | i_ehdr.e_phnum * sizeof x_phdrs[0]); |
| 1675 | if (err) |
| 1676 | { |
| 1677 | free (x_phdrs); |
| 1678 | bfd_set_error (bfd_error_system_call); |
| 1679 | errno = err; |
| 1680 | return NULL; |
| 1681 | } |
| 1682 | i_phdrs = (Elf_Internal_Phdr *) &x_phdrs[i_ehdr.e_phnum]; |
| 1683 | |
| 1684 | contents_size = 0; |
| 1685 | last_phdr = NULL; |
| 1686 | loadbase = ehdr_vma; |
| 1687 | loadbase_set = FALSE; |
| 1688 | for (i = 0; i < i_ehdr.e_phnum; ++i) |
| 1689 | { |
| 1690 | elf_swap_phdr_in (templ, &x_phdrs[i], &i_phdrs[i]); |
| 1691 | if (i_phdrs[i].p_type == PT_LOAD) |
| 1692 | { |
| 1693 | bfd_vma segment_end; |
| 1694 | segment_end = (i_phdrs[i].p_offset + i_phdrs[i].p_filesz |
| 1695 | + i_phdrs[i].p_align - 1) & -i_phdrs[i].p_align; |
| 1696 | if (segment_end > (bfd_vma) contents_size) |
| 1697 | contents_size = segment_end; |
| 1698 | |
| 1699 | /* LOADADDR is the `Base address' from the gELF specification: |
| 1700 | `lowest p_vaddr value for a PT_LOAD segment' is P_VADDR from the |
| 1701 | first PT_LOAD as PT_LOADs are ordered by P_VADDR. */ |
| 1702 | if (!loadbase_set && (i_phdrs[i].p_offset & -i_phdrs[i].p_align) == 0) |
| 1703 | { |
| 1704 | loadbase = ehdr_vma - (i_phdrs[i].p_vaddr & -i_phdrs[i].p_align); |
| 1705 | loadbase_set = TRUE; |
| 1706 | } |
| 1707 | |
| 1708 | last_phdr = &i_phdrs[i]; |
| 1709 | } |
| 1710 | } |
| 1711 | if (last_phdr == NULL) |
| 1712 | { |
| 1713 | /* There were no PT_LOAD segments, so we don't have anything to read. */ |
| 1714 | free (x_phdrs); |
| 1715 | bfd_set_error (bfd_error_wrong_format); |
| 1716 | return NULL; |
| 1717 | } |
| 1718 | |
| 1719 | /* Trim the last segment so we don't bother with zeros in the last page |
| 1720 | that are off the end of the file. However, if the extra bit in that |
| 1721 | page includes the section headers, keep them. */ |
| 1722 | if ((bfd_vma) contents_size > last_phdr->p_offset + last_phdr->p_filesz |
| 1723 | && (bfd_vma) contents_size >= (i_ehdr.e_shoff |
| 1724 | + i_ehdr.e_shnum * i_ehdr.e_shentsize)) |
| 1725 | { |
| 1726 | contents_size = last_phdr->p_offset + last_phdr->p_filesz; |
| 1727 | if ((bfd_vma) contents_size < (i_ehdr.e_shoff |
| 1728 | + i_ehdr.e_shnum * i_ehdr.e_shentsize)) |
| 1729 | contents_size = i_ehdr.e_shoff + i_ehdr.e_shnum * i_ehdr.e_shentsize; |
| 1730 | } |
| 1731 | else |
| 1732 | contents_size = last_phdr->p_offset + last_phdr->p_filesz; |
| 1733 | |
| 1734 | /* Now we know the size of the whole image we want read in. */ |
| 1735 | contents = bfd_zmalloc (contents_size); |
| 1736 | if (contents == NULL) |
| 1737 | { |
| 1738 | free (x_phdrs); |
| 1739 | bfd_set_error (bfd_error_no_memory); |
| 1740 | return NULL; |
| 1741 | } |
| 1742 | |
| 1743 | for (i = 0; i < i_ehdr.e_phnum; ++i) |
| 1744 | if (i_phdrs[i].p_type == PT_LOAD) |
| 1745 | { |
| 1746 | bfd_vma start = i_phdrs[i].p_offset & -i_phdrs[i].p_align; |
| 1747 | bfd_vma end = (i_phdrs[i].p_offset + i_phdrs[i].p_filesz |
| 1748 | + i_phdrs[i].p_align - 1) & -i_phdrs[i].p_align; |
| 1749 | if (end > (bfd_vma) contents_size) |
| 1750 | end = contents_size; |
| 1751 | err = target_read_memory ((loadbase + i_phdrs[i].p_vaddr) |
| 1752 | & -i_phdrs[i].p_align, |
| 1753 | contents + start, end - start); |
| 1754 | if (err) |
| 1755 | { |
| 1756 | free (x_phdrs); |
| 1757 | free (contents); |
| 1758 | bfd_set_error (bfd_error_system_call); |
| 1759 | errno = err; |
| 1760 | return NULL; |
| 1761 | } |
| 1762 | } |
| 1763 | free (x_phdrs); |
| 1764 | |
| 1765 | /* If the segments visible in memory didn't include the section headers, |
| 1766 | then clear them from the file header. */ |
| 1767 | if ((bfd_vma) contents_size < (i_ehdr.e_shoff |
| 1768 | + i_ehdr.e_shnum * i_ehdr.e_shentsize)) |
| 1769 | { |
| 1770 | memset (&x_ehdr.e_shoff, 0, sizeof x_ehdr.e_shoff); |
| 1771 | memset (&x_ehdr.e_shnum, 0, sizeof x_ehdr.e_shnum); |
| 1772 | memset (&x_ehdr.e_shstrndx, 0, sizeof x_ehdr.e_shstrndx); |
| 1773 | } |
| 1774 | |
| 1775 | /* This will normally have been in the first PT_LOAD segment. But it |
| 1776 | conceivably could be missing, and we might have just changed it. */ |
| 1777 | memcpy (contents, &x_ehdr, sizeof x_ehdr); |
| 1778 | |
| 1779 | /* Now we have a memory image of the ELF file contents. Make a BFD. */ |
| 1780 | bim = bfd_malloc (sizeof (struct bfd_in_memory)); |
| 1781 | if (bim == NULL) |
| 1782 | { |
| 1783 | free (contents); |
| 1784 | bfd_set_error (bfd_error_no_memory); |
| 1785 | return NULL; |
| 1786 | } |
| 1787 | nbfd = _bfd_new_bfd (); |
| 1788 | if (nbfd == NULL) |
| 1789 | { |
| 1790 | free (bim); |
| 1791 | free (contents); |
| 1792 | bfd_set_error (bfd_error_no_memory); |
| 1793 | return NULL; |
| 1794 | } |
| 1795 | nbfd->filename = "<in-memory>"; |
| 1796 | nbfd->xvec = templ->xvec; |
| 1797 | bim->size = contents_size; |
| 1798 | bim->buffer = contents; |
| 1799 | nbfd->iostream = bim; |
| 1800 | nbfd->flags = BFD_IN_MEMORY; |
| 1801 | nbfd->direction = read_direction; |
| 1802 | nbfd->mtime = time (NULL); |
| 1803 | nbfd->mtime_set = TRUE; |
| 1804 | |
| 1805 | if (loadbasep) |
| 1806 | *loadbasep = loadbase; |
| 1807 | return nbfd; |
| 1808 | } |
| 1809 | \f |
| 1810 | #include "elfcore.h" |
| 1811 | \f |
| 1812 | /* Size-dependent data and functions. */ |
| 1813 | const struct elf_size_info NAME(_bfd_elf,size_info) = { |
| 1814 | sizeof (Elf_External_Ehdr), |
| 1815 | sizeof (Elf_External_Phdr), |
| 1816 | sizeof (Elf_External_Shdr), |
| 1817 | sizeof (Elf_External_Rel), |
| 1818 | sizeof (Elf_External_Rela), |
| 1819 | sizeof (Elf_External_Sym), |
| 1820 | sizeof (Elf_External_Dyn), |
| 1821 | sizeof (Elf_External_Note), |
| 1822 | 4, |
| 1823 | 1, |
| 1824 | ARCH_SIZE, LOG_FILE_ALIGN, |
| 1825 | ELFCLASS, EV_CURRENT, |
| 1826 | elf_write_out_phdrs, |
| 1827 | elf_write_shdrs_and_ehdr, |
| 1828 | elf_checksum_contents, |
| 1829 | elf_write_relocs, |
| 1830 | elf_swap_symbol_in, |
| 1831 | elf_swap_symbol_out, |
| 1832 | elf_slurp_reloc_table, |
| 1833 | elf_slurp_symbol_table, |
| 1834 | elf_swap_dyn_in, |
| 1835 | elf_swap_dyn_out, |
| 1836 | elf_swap_reloc_in, |
| 1837 | elf_swap_reloc_out, |
| 1838 | elf_swap_reloca_in, |
| 1839 | elf_swap_reloca_out |
| 1840 | }; |