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