| 1 | /* ELF executable support for BFD. |
| 2 | Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, |
| 3 | 2001, 2002 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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_get_symtab NAME(bfd_elf,get_symtab) |
| 106 | #define elf_canonicalize_dynamic_symtab \ |
| 107 | NAME(bfd_elf,canonicalize_dynamic_symtab) |
| 108 | #define elf_make_empty_symbol NAME(bfd_elf,make_empty_symbol) |
| 109 | #define elf_get_symbol_info NAME(bfd_elf,get_symbol_info) |
| 110 | #define elf_get_lineno NAME(bfd_elf,get_lineno) |
| 111 | #define elf_set_arch_mach NAME(bfd_elf,set_arch_mach) |
| 112 | #define elf_find_nearest_line NAME(bfd_elf,find_nearest_line) |
| 113 | #define elf_sizeof_headers NAME(bfd_elf,sizeof_headers) |
| 114 | #define elf_set_section_contents NAME(bfd_elf,set_section_contents) |
| 115 | #define elf_no_info_to_howto NAME(bfd_elf,no_info_to_howto) |
| 116 | #define elf_no_info_to_howto_rel NAME(bfd_elf,no_info_to_howto_rel) |
| 117 | #define elf_find_section NAME(bfd_elf,find_section) |
| 118 | #define elf_bfd_link_add_symbols NAME(bfd_elf,bfd_link_add_symbols) |
| 119 | #define elf_add_dynamic_entry NAME(bfd_elf,add_dynamic_entry) |
| 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 | #define elf_link_create_dynamic_sections \ |
| 125 | NAME(bfd_elf,link_create_dynamic_sections) |
| 126 | #define elf_bfd_discard_info NAME(bfd_elf,discard_info) |
| 127 | #define elf_reloc_symbol_deleted_p NAME(_bfd_elf,reloc_symbol_deleted_p) |
| 128 | #define elf_link_record_dynamic_symbol _bfd_elf_link_record_dynamic_symbol |
| 129 | #define elf_bfd_final_link NAME(bfd_elf,bfd_final_link) |
| 130 | #define elf_create_pointer_linker_section NAME(bfd_elf,create_pointer_linker_section) |
| 131 | #define elf_finish_pointer_linker_section NAME(bfd_elf,finish_pointer_linker_section) |
| 132 | #define elf_gc_sections NAME(_bfd_elf,gc_sections) |
| 133 | #define elf_gc_common_finalize_got_offsets \ |
| 134 | NAME(_bfd_elf,gc_common_finalize_got_offsets) |
| 135 | #define elf_gc_common_final_link NAME(_bfd_elf,gc_common_final_link) |
| 136 | #define elf_gc_record_vtinherit NAME(_bfd_elf,gc_record_vtinherit) |
| 137 | #define elf_gc_record_vtentry NAME(_bfd_elf,gc_record_vtentry) |
| 138 | #define elf_link_record_local_dynamic_symbol \ |
| 139 | NAME(_bfd_elf,link_record_local_dynamic_symbol) |
| 140 | |
| 141 | #if ARCH_SIZE == 64 |
| 142 | #define ELF_R_INFO(X,Y) ELF64_R_INFO(X,Y) |
| 143 | #define ELF_R_SYM(X) ELF64_R_SYM(X) |
| 144 | #define ELF_R_TYPE(X) ELF64_R_TYPE(X) |
| 145 | #define ELFCLASS ELFCLASS64 |
| 146 | #define FILE_ALIGN 8 |
| 147 | #define LOG_FILE_ALIGN 3 |
| 148 | #endif |
| 149 | #if ARCH_SIZE == 32 |
| 150 | #define ELF_R_INFO(X,Y) ELF32_R_INFO(X,Y) |
| 151 | #define ELF_R_SYM(X) ELF32_R_SYM(X) |
| 152 | #define ELF_R_TYPE(X) ELF32_R_TYPE(X) |
| 153 | #define ELFCLASS ELFCLASS32 |
| 154 | #define FILE_ALIGN 4 |
| 155 | #define LOG_FILE_ALIGN 2 |
| 156 | #endif |
| 157 | |
| 158 | /* Static functions */ |
| 159 | |
| 160 | static void elf_swap_ehdr_in |
| 161 | PARAMS ((bfd *, const Elf_External_Ehdr *, Elf_Internal_Ehdr *)); |
| 162 | static void elf_swap_ehdr_out |
| 163 | PARAMS ((bfd *, const Elf_Internal_Ehdr *, Elf_External_Ehdr *)); |
| 164 | static void elf_swap_shdr_in |
| 165 | PARAMS ((bfd *, const Elf_External_Shdr *, Elf_Internal_Shdr *)); |
| 166 | static void elf_swap_shdr_out |
| 167 | PARAMS ((bfd *, const Elf_Internal_Shdr *, Elf_External_Shdr *)); |
| 168 | |
| 169 | #define elf_stringtab_init _bfd_elf_stringtab_init |
| 170 | |
| 171 | #define section_from_elf_index bfd_section_from_elf_index |
| 172 | |
| 173 | static boolean elf_slurp_reloc_table_from_section |
| 174 | PARAMS ((bfd *, asection *, Elf_Internal_Shdr *, bfd_size_type, |
| 175 | arelent *, asymbol **, boolean)); |
| 176 | |
| 177 | static boolean elf_file_p PARAMS ((Elf_External_Ehdr *)); |
| 178 | |
| 179 | #ifdef DEBUG |
| 180 | static void elf_debug_section PARAMS ((int, Elf_Internal_Shdr *)); |
| 181 | static void elf_debug_file PARAMS ((Elf_Internal_Ehdr *)); |
| 182 | static char *elf_symbol_flags PARAMS ((flagword)); |
| 183 | #endif |
| 184 | \f |
| 185 | /* Structure swapping routines */ |
| 186 | |
| 187 | /* Should perhaps use put_offset, put_word, etc. For now, the two versions |
| 188 | can be handled by explicitly specifying 32 bits or "the long type". */ |
| 189 | #if ARCH_SIZE == 64 |
| 190 | #define H_PUT_WORD H_PUT_64 |
| 191 | #define H_PUT_SIGNED_WORD H_PUT_S64 |
| 192 | #define H_GET_WORD H_GET_64 |
| 193 | #define H_GET_SIGNED_WORD H_GET_S64 |
| 194 | #endif |
| 195 | #if ARCH_SIZE == 32 |
| 196 | #define H_PUT_WORD H_PUT_32 |
| 197 | #define H_PUT_SIGNED_WORD H_PUT_S32 |
| 198 | #define H_GET_WORD H_GET_32 |
| 199 | #define H_GET_SIGNED_WORD H_GET_S32 |
| 200 | #endif |
| 201 | |
| 202 | /* Translate an ELF symbol in external format into an ELF symbol in internal |
| 203 | format. */ |
| 204 | |
| 205 | void |
| 206 | elf_swap_symbol_in (abfd, psrc, pshn, dst) |
| 207 | bfd *abfd; |
| 208 | const PTR psrc; |
| 209 | const PTR pshn; |
| 210 | Elf_Internal_Sym *dst; |
| 211 | { |
| 212 | const Elf_External_Sym *src = (const Elf_External_Sym *) psrc; |
| 213 | const Elf_External_Sym_Shndx *shndx = (const Elf_External_Sym_Shndx *) pshn; |
| 214 | int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma; |
| 215 | |
| 216 | dst->st_name = H_GET_32 (abfd, src->st_name); |
| 217 | if (signed_vma) |
| 218 | dst->st_value = H_GET_SIGNED_WORD (abfd, src->st_value); |
| 219 | else |
| 220 | dst->st_value = H_GET_WORD (abfd, src->st_value); |
| 221 | dst->st_size = H_GET_WORD (abfd, src->st_size); |
| 222 | dst->st_info = H_GET_8 (abfd, src->st_info); |
| 223 | dst->st_other = H_GET_8 (abfd, src->st_other); |
| 224 | dst->st_shndx = H_GET_16 (abfd, src->st_shndx); |
| 225 | if (dst->st_shndx == SHN_XINDEX) |
| 226 | { |
| 227 | if (shndx == NULL) |
| 228 | abort (); |
| 229 | dst->st_shndx = H_GET_32 (abfd, shndx->est_shndx); |
| 230 | } |
| 231 | } |
| 232 | |
| 233 | /* Translate an ELF symbol in internal format into an ELF symbol in external |
| 234 | format. */ |
| 235 | |
| 236 | void |
| 237 | elf_swap_symbol_out (abfd, src, cdst, shndx) |
| 238 | bfd *abfd; |
| 239 | const Elf_Internal_Sym *src; |
| 240 | PTR cdst; |
| 241 | PTR shndx; |
| 242 | { |
| 243 | unsigned int tmp; |
| 244 | Elf_External_Sym *dst = (Elf_External_Sym *) cdst; |
| 245 | H_PUT_32 (abfd, src->st_name, dst->st_name); |
| 246 | H_PUT_WORD (abfd, src->st_value, dst->st_value); |
| 247 | H_PUT_WORD (abfd, src->st_size, dst->st_size); |
| 248 | H_PUT_8 (abfd, src->st_info, dst->st_info); |
| 249 | H_PUT_8 (abfd, src->st_other, dst->st_other); |
| 250 | tmp = src->st_shndx; |
| 251 | if (tmp > SHN_HIRESERVE) |
| 252 | { |
| 253 | if (shndx == NULL) |
| 254 | abort (); |
| 255 | H_PUT_32 (abfd, tmp, shndx); |
| 256 | tmp = SHN_XINDEX; |
| 257 | } |
| 258 | H_PUT_16 (abfd, tmp, dst->st_shndx); |
| 259 | } |
| 260 | |
| 261 | /* Translate an ELF file header in external format into an ELF file header in |
| 262 | internal format. */ |
| 263 | |
| 264 | static void |
| 265 | elf_swap_ehdr_in (abfd, src, dst) |
| 266 | bfd *abfd; |
| 267 | const Elf_External_Ehdr *src; |
| 268 | Elf_Internal_Ehdr *dst; |
| 269 | { |
| 270 | int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma; |
| 271 | memcpy (dst->e_ident, src->e_ident, EI_NIDENT); |
| 272 | dst->e_type = H_GET_16 (abfd, src->e_type); |
| 273 | dst->e_machine = H_GET_16 (abfd, src->e_machine); |
| 274 | dst->e_version = H_GET_32 (abfd, src->e_version); |
| 275 | if (signed_vma) |
| 276 | dst->e_entry = H_GET_SIGNED_WORD (abfd, src->e_entry); |
| 277 | else |
| 278 | dst->e_entry = H_GET_WORD (abfd, src->e_entry); |
| 279 | dst->e_phoff = H_GET_WORD (abfd, src->e_phoff); |
| 280 | dst->e_shoff = H_GET_WORD (abfd, src->e_shoff); |
| 281 | dst->e_flags = H_GET_32 (abfd, src->e_flags); |
| 282 | dst->e_ehsize = H_GET_16 (abfd, src->e_ehsize); |
| 283 | dst->e_phentsize = H_GET_16 (abfd, src->e_phentsize); |
| 284 | dst->e_phnum = H_GET_16 (abfd, src->e_phnum); |
| 285 | dst->e_shentsize = H_GET_16 (abfd, src->e_shentsize); |
| 286 | dst->e_shnum = H_GET_16 (abfd, src->e_shnum); |
| 287 | dst->e_shstrndx = H_GET_16 (abfd, src->e_shstrndx); |
| 288 | } |
| 289 | |
| 290 | /* Translate an ELF file header in internal format into an ELF file header in |
| 291 | external format. */ |
| 292 | |
| 293 | static void |
| 294 | elf_swap_ehdr_out (abfd, src, dst) |
| 295 | bfd *abfd; |
| 296 | const Elf_Internal_Ehdr *src; |
| 297 | Elf_External_Ehdr *dst; |
| 298 | { |
| 299 | unsigned int tmp; |
| 300 | int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma; |
| 301 | memcpy (dst->e_ident, src->e_ident, EI_NIDENT); |
| 302 | /* note that all elements of dst are *arrays of unsigned char* already... */ |
| 303 | H_PUT_16 (abfd, src->e_type, dst->e_type); |
| 304 | H_PUT_16 (abfd, src->e_machine, dst->e_machine); |
| 305 | H_PUT_32 (abfd, src->e_version, dst->e_version); |
| 306 | if (signed_vma) |
| 307 | H_PUT_SIGNED_WORD (abfd, src->e_entry, dst->e_entry); |
| 308 | else |
| 309 | H_PUT_WORD (abfd, src->e_entry, dst->e_entry); |
| 310 | H_PUT_WORD (abfd, src->e_phoff, dst->e_phoff); |
| 311 | H_PUT_WORD (abfd, src->e_shoff, dst->e_shoff); |
| 312 | H_PUT_32 (abfd, src->e_flags, dst->e_flags); |
| 313 | H_PUT_16 (abfd, src->e_ehsize, dst->e_ehsize); |
| 314 | H_PUT_16 (abfd, src->e_phentsize, dst->e_phentsize); |
| 315 | H_PUT_16 (abfd, src->e_phnum, dst->e_phnum); |
| 316 | H_PUT_16 (abfd, src->e_shentsize, dst->e_shentsize); |
| 317 | tmp = src->e_shnum; |
| 318 | if (tmp >= SHN_LORESERVE) |
| 319 | tmp = SHN_UNDEF; |
| 320 | H_PUT_16 (abfd, tmp, dst->e_shnum); |
| 321 | tmp = src->e_shstrndx; |
| 322 | if (tmp >= SHN_LORESERVE) |
| 323 | tmp = SHN_XINDEX; |
| 324 | H_PUT_16 (abfd, tmp, dst->e_shstrndx); |
| 325 | } |
| 326 | |
| 327 | /* Translate an ELF section header table entry in external format into an |
| 328 | ELF section header table entry in internal format. */ |
| 329 | |
| 330 | static void |
| 331 | elf_swap_shdr_in (abfd, src, dst) |
| 332 | bfd *abfd; |
| 333 | const Elf_External_Shdr *src; |
| 334 | Elf_Internal_Shdr *dst; |
| 335 | { |
| 336 | int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma; |
| 337 | |
| 338 | dst->sh_name = H_GET_32 (abfd, src->sh_name); |
| 339 | dst->sh_type = H_GET_32 (abfd, src->sh_type); |
| 340 | dst->sh_flags = H_GET_WORD (abfd, src->sh_flags); |
| 341 | if (signed_vma) |
| 342 | dst->sh_addr = H_GET_SIGNED_WORD (abfd, src->sh_addr); |
| 343 | else |
| 344 | dst->sh_addr = H_GET_WORD (abfd, src->sh_addr); |
| 345 | dst->sh_offset = H_GET_WORD (abfd, src->sh_offset); |
| 346 | dst->sh_size = H_GET_WORD (abfd, src->sh_size); |
| 347 | dst->sh_link = H_GET_32 (abfd, src->sh_link); |
| 348 | dst->sh_info = H_GET_32 (abfd, src->sh_info); |
| 349 | dst->sh_addralign = H_GET_WORD (abfd, src->sh_addralign); |
| 350 | dst->sh_entsize = H_GET_WORD (abfd, src->sh_entsize); |
| 351 | dst->bfd_section = NULL; |
| 352 | dst->contents = NULL; |
| 353 | } |
| 354 | |
| 355 | /* Translate an ELF section header table entry in internal format into an |
| 356 | ELF section header table entry in external format. */ |
| 357 | |
| 358 | static void |
| 359 | elf_swap_shdr_out (abfd, src, dst) |
| 360 | bfd *abfd; |
| 361 | const Elf_Internal_Shdr *src; |
| 362 | Elf_External_Shdr *dst; |
| 363 | { |
| 364 | /* note that all elements of dst are *arrays of unsigned char* already... */ |
| 365 | H_PUT_32 (abfd, src->sh_name, dst->sh_name); |
| 366 | H_PUT_32 (abfd, src->sh_type, dst->sh_type); |
| 367 | H_PUT_WORD (abfd, src->sh_flags, dst->sh_flags); |
| 368 | H_PUT_WORD (abfd, src->sh_addr, dst->sh_addr); |
| 369 | H_PUT_WORD (abfd, src->sh_offset, dst->sh_offset); |
| 370 | H_PUT_WORD (abfd, src->sh_size, dst->sh_size); |
| 371 | H_PUT_32 (abfd, src->sh_link, dst->sh_link); |
| 372 | H_PUT_32 (abfd, src->sh_info, dst->sh_info); |
| 373 | H_PUT_WORD (abfd, src->sh_addralign, dst->sh_addralign); |
| 374 | H_PUT_WORD (abfd, src->sh_entsize, dst->sh_entsize); |
| 375 | } |
| 376 | |
| 377 | /* Translate an ELF program header table entry in external format into an |
| 378 | ELF program header table entry in internal format. */ |
| 379 | |
| 380 | void |
| 381 | elf_swap_phdr_in (abfd, src, dst) |
| 382 | bfd *abfd; |
| 383 | const Elf_External_Phdr *src; |
| 384 | Elf_Internal_Phdr *dst; |
| 385 | { |
| 386 | int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma; |
| 387 | |
| 388 | dst->p_type = H_GET_32 (abfd, src->p_type); |
| 389 | dst->p_flags = H_GET_32 (abfd, src->p_flags); |
| 390 | dst->p_offset = H_GET_WORD (abfd, src->p_offset); |
| 391 | if (signed_vma) |
| 392 | { |
| 393 | dst->p_vaddr = H_GET_SIGNED_WORD (abfd, src->p_vaddr); |
| 394 | dst->p_paddr = H_GET_SIGNED_WORD (abfd, src->p_paddr); |
| 395 | } |
| 396 | else |
| 397 | { |
| 398 | dst->p_vaddr = H_GET_WORD (abfd, src->p_vaddr); |
| 399 | dst->p_paddr = H_GET_WORD (abfd, src->p_paddr); |
| 400 | } |
| 401 | dst->p_filesz = H_GET_WORD (abfd, src->p_filesz); |
| 402 | dst->p_memsz = H_GET_WORD (abfd, src->p_memsz); |
| 403 | dst->p_align = H_GET_WORD (abfd, src->p_align); |
| 404 | } |
| 405 | |
| 406 | void |
| 407 | elf_swap_phdr_out (abfd, src, dst) |
| 408 | bfd *abfd; |
| 409 | const Elf_Internal_Phdr *src; |
| 410 | Elf_External_Phdr *dst; |
| 411 | { |
| 412 | /* note that all elements of dst are *arrays of unsigned char* already... */ |
| 413 | H_PUT_32 (abfd, src->p_type, dst->p_type); |
| 414 | H_PUT_WORD (abfd, src->p_offset, dst->p_offset); |
| 415 | H_PUT_WORD (abfd, src->p_vaddr, dst->p_vaddr); |
| 416 | H_PUT_WORD (abfd, src->p_paddr, dst->p_paddr); |
| 417 | H_PUT_WORD (abfd, src->p_filesz, dst->p_filesz); |
| 418 | H_PUT_WORD (abfd, src->p_memsz, dst->p_memsz); |
| 419 | H_PUT_32 (abfd, src->p_flags, dst->p_flags); |
| 420 | H_PUT_WORD (abfd, src->p_align, dst->p_align); |
| 421 | } |
| 422 | |
| 423 | /* Translate an ELF reloc from external format to internal format. */ |
| 424 | INLINE void |
| 425 | elf_swap_reloc_in (abfd, src, dst) |
| 426 | bfd *abfd; |
| 427 | const Elf_External_Rel *src; |
| 428 | Elf_Internal_Rel *dst; |
| 429 | { |
| 430 | dst->r_offset = H_GET_WORD (abfd, src->r_offset); |
| 431 | dst->r_info = H_GET_WORD (abfd, src->r_info); |
| 432 | } |
| 433 | |
| 434 | INLINE void |
| 435 | elf_swap_reloca_in (abfd, src, dst) |
| 436 | bfd *abfd; |
| 437 | const Elf_External_Rela *src; |
| 438 | Elf_Internal_Rela *dst; |
| 439 | { |
| 440 | dst->r_offset = H_GET_WORD (abfd, src->r_offset); |
| 441 | dst->r_info = H_GET_WORD (abfd, src->r_info); |
| 442 | dst->r_addend = H_GET_SIGNED_WORD (abfd, src->r_addend); |
| 443 | } |
| 444 | |
| 445 | /* Translate an ELF reloc from internal format to external format. */ |
| 446 | INLINE void |
| 447 | elf_swap_reloc_out (abfd, src, dst) |
| 448 | bfd *abfd; |
| 449 | const Elf_Internal_Rel *src; |
| 450 | Elf_External_Rel *dst; |
| 451 | { |
| 452 | H_PUT_WORD (abfd, src->r_offset, dst->r_offset); |
| 453 | H_PUT_WORD (abfd, src->r_info, dst->r_info); |
| 454 | } |
| 455 | |
| 456 | INLINE void |
| 457 | elf_swap_reloca_out (abfd, src, dst) |
| 458 | bfd *abfd; |
| 459 | const Elf_Internal_Rela *src; |
| 460 | Elf_External_Rela *dst; |
| 461 | { |
| 462 | H_PUT_WORD (abfd, src->r_offset, dst->r_offset); |
| 463 | H_PUT_WORD (abfd, src->r_info, dst->r_info); |
| 464 | H_PUT_SIGNED_WORD (abfd, src->r_addend, dst->r_addend); |
| 465 | } |
| 466 | |
| 467 | INLINE void |
| 468 | elf_swap_dyn_in (abfd, p, dst) |
| 469 | bfd *abfd; |
| 470 | const PTR p; |
| 471 | Elf_Internal_Dyn *dst; |
| 472 | { |
| 473 | const Elf_External_Dyn *src = (const Elf_External_Dyn *) p; |
| 474 | |
| 475 | dst->d_tag = H_GET_WORD (abfd, src->d_tag); |
| 476 | dst->d_un.d_val = H_GET_WORD (abfd, src->d_un.d_val); |
| 477 | } |
| 478 | |
| 479 | INLINE void |
| 480 | elf_swap_dyn_out (abfd, src, p) |
| 481 | bfd *abfd; |
| 482 | const Elf_Internal_Dyn *src; |
| 483 | PTR p; |
| 484 | { |
| 485 | Elf_External_Dyn *dst = (Elf_External_Dyn *) p; |
| 486 | |
| 487 | H_PUT_WORD (abfd, src->d_tag, dst->d_tag); |
| 488 | H_PUT_WORD (abfd, src->d_un.d_val, dst->d_un.d_val); |
| 489 | } |
| 490 | \f |
| 491 | /* ELF .o/exec file reading */ |
| 492 | |
| 493 | /* Begin processing a given object. |
| 494 | |
| 495 | First we validate the file by reading in the ELF header and checking |
| 496 | the magic number. */ |
| 497 | |
| 498 | static INLINE boolean |
| 499 | elf_file_p (x_ehdrp) |
| 500 | Elf_External_Ehdr *x_ehdrp; |
| 501 | { |
| 502 | return ((x_ehdrp->e_ident[EI_MAG0] == ELFMAG0) |
| 503 | && (x_ehdrp->e_ident[EI_MAG1] == ELFMAG1) |
| 504 | && (x_ehdrp->e_ident[EI_MAG2] == ELFMAG2) |
| 505 | && (x_ehdrp->e_ident[EI_MAG3] == ELFMAG3)); |
| 506 | } |
| 507 | |
| 508 | struct bfd_preserve |
| 509 | { |
| 510 | const struct bfd_arch_info *arch_info; |
| 511 | struct elf_obj_tdata *tdata; |
| 512 | struct bfd_hash_table section_htab; |
| 513 | struct sec *sections; |
| 514 | struct sec **section_tail; |
| 515 | unsigned int section_count; |
| 516 | }; |
| 517 | |
| 518 | /* Check to see if the file associated with ABFD matches the target vector |
| 519 | that ABFD points to. |
| 520 | |
| 521 | Note that we may be called several times with the same ABFD, but different |
| 522 | target vectors, most of which will not match. We have to avoid leaving |
| 523 | any side effects in ABFD, or any data it points to (like tdata), if the |
| 524 | file does not match the target vector. */ |
| 525 | |
| 526 | const bfd_target * |
| 527 | elf_object_p (abfd) |
| 528 | bfd *abfd; |
| 529 | { |
| 530 | Elf_External_Ehdr x_ehdr; /* Elf file header, external form */ |
| 531 | Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */ |
| 532 | Elf_External_Shdr x_shdr; /* Section header table entry, external form */ |
| 533 | Elf_Internal_Shdr i_shdr; |
| 534 | Elf_Internal_Shdr *i_shdrp; /* Section header table, internal form */ |
| 535 | unsigned int shindex; |
| 536 | char *shstrtab; /* Internal copy of section header stringtab */ |
| 537 | struct elf_backend_data *ebd; |
| 538 | struct bfd_preserve preserve; |
| 539 | struct elf_obj_tdata *new_tdata = NULL; |
| 540 | asection *s; |
| 541 | bfd_size_type amt; |
| 542 | |
| 543 | preserve.arch_info = abfd->arch_info; |
| 544 | |
| 545 | /* Read in the ELF header in external format. */ |
| 546 | |
| 547 | if (bfd_bread ((PTR) & x_ehdr, (bfd_size_type) sizeof (x_ehdr), abfd) |
| 548 | != sizeof (x_ehdr)) |
| 549 | { |
| 550 | if (bfd_get_error () != bfd_error_system_call) |
| 551 | goto got_wrong_format_error; |
| 552 | else |
| 553 | goto got_no_match; |
| 554 | } |
| 555 | |
| 556 | /* Now check to see if we have a valid ELF file, and one that BFD can |
| 557 | make use of. The magic number must match, the address size ('class') |
| 558 | and byte-swapping must match our XVEC entry, and it must have a |
| 559 | section header table (FIXME: See comments re sections at top of this |
| 560 | file). */ |
| 561 | |
| 562 | if ((elf_file_p (&x_ehdr) == false) || |
| 563 | (x_ehdr.e_ident[EI_VERSION] != EV_CURRENT) || |
| 564 | (x_ehdr.e_ident[EI_CLASS] != ELFCLASS)) |
| 565 | goto got_wrong_format_error; |
| 566 | |
| 567 | /* Check that file's byte order matches xvec's */ |
| 568 | switch (x_ehdr.e_ident[EI_DATA]) |
| 569 | { |
| 570 | case ELFDATA2MSB: /* Big-endian */ |
| 571 | if (! bfd_header_big_endian (abfd)) |
| 572 | goto got_wrong_format_error; |
| 573 | break; |
| 574 | case ELFDATA2LSB: /* Little-endian */ |
| 575 | if (! bfd_header_little_endian (abfd)) |
| 576 | goto got_wrong_format_error; |
| 577 | break; |
| 578 | case ELFDATANONE: /* No data encoding specified */ |
| 579 | default: /* Unknown data encoding specified */ |
| 580 | goto got_wrong_format_error; |
| 581 | } |
| 582 | |
| 583 | /* Allocate an instance of the elf_obj_tdata structure and hook it up to |
| 584 | the tdata pointer in the bfd. */ |
| 585 | |
| 586 | amt = sizeof (struct elf_obj_tdata); |
| 587 | new_tdata = (struct elf_obj_tdata *) bfd_zalloc (abfd, amt); |
| 588 | if (new_tdata == NULL) |
| 589 | goto got_no_match; |
| 590 | preserve.tdata = elf_tdata (abfd); |
| 591 | elf_tdata (abfd) = new_tdata; |
| 592 | |
| 593 | /* Clear section information, since there might be a recognized bfd that |
| 594 | we now check if we can replace, and we don't want to append to it. */ |
| 595 | preserve.sections = abfd->sections; |
| 596 | preserve.section_tail = abfd->section_tail; |
| 597 | preserve.section_count = abfd->section_count; |
| 598 | preserve.section_htab = abfd->section_htab; |
| 599 | abfd->sections = NULL; |
| 600 | abfd->section_tail = &abfd->sections; |
| 601 | abfd->section_count = 0; |
| 602 | if (!bfd_hash_table_init (&abfd->section_htab, bfd_section_hash_newfunc)) |
| 603 | goto got_no_match; |
| 604 | |
| 605 | /* Now that we know the byte order, swap in the rest of the header */ |
| 606 | i_ehdrp = elf_elfheader (abfd); |
| 607 | elf_swap_ehdr_in (abfd, &x_ehdr, i_ehdrp); |
| 608 | #if DEBUG & 1 |
| 609 | elf_debug_file (i_ehdrp); |
| 610 | #endif |
| 611 | |
| 612 | /* Reject ET_CORE (header indicates core file, not object file) */ |
| 613 | if (i_ehdrp->e_type == ET_CORE) |
| 614 | goto got_wrong_format_error; |
| 615 | |
| 616 | /* If this is a relocatable file and there is no section header |
| 617 | table, then we're hosed. */ |
| 618 | if (i_ehdrp->e_shoff == 0 && i_ehdrp->e_type == ET_REL) |
| 619 | goto got_wrong_format_error; |
| 620 | |
| 621 | /* As a simple sanity check, verify that the what BFD thinks is the |
| 622 | size of each section header table entry actually matches the size |
| 623 | recorded in the file, but only if there are any sections. */ |
| 624 | if (i_ehdrp->e_shentsize != sizeof (x_shdr) && i_ehdrp->e_shnum != 0) |
| 625 | goto got_wrong_format_error; |
| 626 | |
| 627 | ebd = get_elf_backend_data (abfd); |
| 628 | |
| 629 | /* Check that the ELF e_machine field matches what this particular |
| 630 | BFD format expects. */ |
| 631 | if (ebd->elf_machine_code != i_ehdrp->e_machine |
| 632 | && (ebd->elf_machine_alt1 == 0 || i_ehdrp->e_machine != ebd->elf_machine_alt1) |
| 633 | && (ebd->elf_machine_alt2 == 0 || i_ehdrp->e_machine != ebd->elf_machine_alt2)) |
| 634 | { |
| 635 | const bfd_target * const *target_ptr; |
| 636 | |
| 637 | if (ebd->elf_machine_code != EM_NONE) |
| 638 | goto got_wrong_format_error; |
| 639 | |
| 640 | /* This is the generic ELF target. Let it match any ELF target |
| 641 | for which we do not have a specific backend. */ |
| 642 | for (target_ptr = bfd_target_vector; *target_ptr != NULL; target_ptr++) |
| 643 | { |
| 644 | struct elf_backend_data *back; |
| 645 | |
| 646 | if ((*target_ptr)->flavour != bfd_target_elf_flavour) |
| 647 | continue; |
| 648 | back = (struct elf_backend_data *) (*target_ptr)->backend_data; |
| 649 | if (back->elf_machine_code == i_ehdrp->e_machine |
| 650 | || (back->elf_machine_alt1 != 0 |
| 651 | && back->elf_machine_alt1 == i_ehdrp->e_machine) |
| 652 | || (back->elf_machine_alt2 != 0 |
| 653 | && back->elf_machine_alt2 == i_ehdrp->e_machine)) |
| 654 | { |
| 655 | /* target_ptr is an ELF backend which matches this |
| 656 | object file, so reject the generic ELF target. */ |
| 657 | goto got_wrong_format_error; |
| 658 | } |
| 659 | } |
| 660 | } |
| 661 | |
| 662 | if (i_ehdrp->e_type == ET_EXEC) |
| 663 | abfd->flags |= EXEC_P; |
| 664 | else if (i_ehdrp->e_type == ET_DYN) |
| 665 | abfd->flags |= DYNAMIC; |
| 666 | |
| 667 | if (i_ehdrp->e_phnum > 0) |
| 668 | abfd->flags |= D_PAGED; |
| 669 | |
| 670 | if (! bfd_default_set_arch_mach (abfd, ebd->arch, 0)) |
| 671 | { |
| 672 | /* It's OK if this fails for the generic target. */ |
| 673 | if (ebd->elf_machine_code != EM_NONE) |
| 674 | goto got_no_match; |
| 675 | } |
| 676 | |
| 677 | /* Remember the entry point specified in the ELF file header. */ |
| 678 | bfd_set_start_address (abfd, i_ehdrp->e_entry); |
| 679 | |
| 680 | /* Seek to the section header table in the file. */ |
| 681 | if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_shoff, SEEK_SET) != 0) |
| 682 | goto got_no_match; |
| 683 | |
| 684 | /* Read the first section header at index 0, and convert to internal |
| 685 | form. */ |
| 686 | if (bfd_bread ((PTR) & x_shdr, (bfd_size_type) sizeof x_shdr, abfd) |
| 687 | != sizeof (x_shdr)) |
| 688 | goto got_no_match; |
| 689 | elf_swap_shdr_in (abfd, &x_shdr, &i_shdr); |
| 690 | |
| 691 | /* If the section count is zero, the actual count is in the first |
| 692 | section header. */ |
| 693 | if (i_ehdrp->e_shnum == SHN_UNDEF) |
| 694 | i_ehdrp->e_shnum = i_shdr.sh_size; |
| 695 | |
| 696 | /* And similarly for the string table index. */ |
| 697 | if (i_ehdrp->e_shstrndx == SHN_XINDEX) |
| 698 | i_ehdrp->e_shstrndx = i_shdr.sh_link; |
| 699 | |
| 700 | /* Allocate space for a copy of the section header table in |
| 701 | internal form. */ |
| 702 | if (i_ehdrp->e_shnum != 0) |
| 703 | { |
| 704 | Elf_Internal_Shdr *shdrp; |
| 705 | unsigned int num_sec; |
| 706 | |
| 707 | amt = sizeof (*i_shdrp) * i_ehdrp->e_shnum; |
| 708 | i_shdrp = (Elf_Internal_Shdr *) bfd_alloc (abfd, amt); |
| 709 | if (!i_shdrp) |
| 710 | goto got_no_match; |
| 711 | num_sec = i_ehdrp->e_shnum; |
| 712 | if (num_sec > SHN_LORESERVE) |
| 713 | num_sec += SHN_HIRESERVE + 1 - SHN_LORESERVE; |
| 714 | elf_numsections (abfd) = num_sec; |
| 715 | amt = sizeof (i_shdrp) * num_sec; |
| 716 | elf_elfsections (abfd) = (Elf_Internal_Shdr **) bfd_alloc (abfd, amt); |
| 717 | if (!elf_elfsections (abfd)) |
| 718 | goto got_no_match; |
| 719 | |
| 720 | memcpy (i_shdrp, &i_shdr, sizeof (*i_shdrp)); |
| 721 | shdrp = i_shdrp; |
| 722 | shindex = 0; |
| 723 | if (num_sec > SHN_LORESERVE) |
| 724 | { |
| 725 | for ( ; shindex < SHN_LORESERVE; shindex++) |
| 726 | elf_elfsections (abfd)[shindex] = shdrp++; |
| 727 | for ( ; shindex < SHN_HIRESERVE + 1; shindex++) |
| 728 | elf_elfsections (abfd)[shindex] = i_shdrp; |
| 729 | } |
| 730 | for ( ; shindex < num_sec; shindex++) |
| 731 | elf_elfsections (abfd)[shindex] = shdrp++; |
| 732 | |
| 733 | /* Read in the rest of the section header table and convert it |
| 734 | to internal form. */ |
| 735 | for (shindex = 1; shindex < i_ehdrp->e_shnum; shindex++) |
| 736 | { |
| 737 | if (bfd_bread ((PTR) & x_shdr, (bfd_size_type) sizeof x_shdr, abfd) |
| 738 | != sizeof (x_shdr)) |
| 739 | goto got_no_match; |
| 740 | elf_swap_shdr_in (abfd, &x_shdr, i_shdrp + shindex); |
| 741 | |
| 742 | /* If the section is loaded, but not page aligned, clear |
| 743 | D_PAGED. */ |
| 744 | if (i_shdrp[shindex].sh_size != 0 |
| 745 | && (i_shdrp[shindex].sh_flags & SHF_ALLOC) != 0 |
| 746 | && i_shdrp[shindex].sh_type != SHT_NOBITS |
| 747 | && (((i_shdrp[shindex].sh_addr - i_shdrp[shindex].sh_offset) |
| 748 | % ebd->maxpagesize) |
| 749 | != 0)) |
| 750 | abfd->flags &= ~D_PAGED; |
| 751 | } |
| 752 | } |
| 753 | |
| 754 | if (i_ehdrp->e_shstrndx) |
| 755 | { |
| 756 | if (! bfd_section_from_shdr (abfd, i_ehdrp->e_shstrndx)) |
| 757 | goto got_no_match; |
| 758 | } |
| 759 | |
| 760 | /* Read in the program headers. */ |
| 761 | if (i_ehdrp->e_phnum == 0) |
| 762 | elf_tdata (abfd)->phdr = NULL; |
| 763 | else |
| 764 | { |
| 765 | Elf_Internal_Phdr *i_phdr; |
| 766 | unsigned int i; |
| 767 | |
| 768 | amt = i_ehdrp->e_phnum * sizeof (Elf_Internal_Phdr); |
| 769 | elf_tdata (abfd)->phdr = (Elf_Internal_Phdr *) bfd_alloc (abfd, amt); |
| 770 | if (elf_tdata (abfd)->phdr == NULL) |
| 771 | goto got_no_match; |
| 772 | if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_phoff, SEEK_SET) != 0) |
| 773 | goto got_no_match; |
| 774 | i_phdr = elf_tdata (abfd)->phdr; |
| 775 | for (i = 0; i < i_ehdrp->e_phnum; i++, i_phdr++) |
| 776 | { |
| 777 | Elf_External_Phdr x_phdr; |
| 778 | |
| 779 | if (bfd_bread ((PTR) &x_phdr, (bfd_size_type) sizeof x_phdr, abfd) |
| 780 | != sizeof x_phdr) |
| 781 | goto got_no_match; |
| 782 | elf_swap_phdr_in (abfd, &x_phdr, i_phdr); |
| 783 | } |
| 784 | } |
| 785 | |
| 786 | /* Read in the string table containing the names of the sections. We |
| 787 | will need the base pointer to this table later. */ |
| 788 | /* We read this inline now, so that we don't have to go through |
| 789 | bfd_section_from_shdr with it (since this particular strtab is |
| 790 | used to find all of the ELF section names.) */ |
| 791 | |
| 792 | if (i_ehdrp->e_shstrndx != 0) |
| 793 | { |
| 794 | unsigned int num_sec; |
| 795 | |
| 796 | shstrtab = bfd_elf_get_str_section (abfd, i_ehdrp->e_shstrndx); |
| 797 | if (!shstrtab) |
| 798 | goto got_no_match; |
| 799 | |
| 800 | /* Once all of the section headers have been read and converted, we |
| 801 | can start processing them. Note that the first section header is |
| 802 | a dummy placeholder entry, so we ignore it. */ |
| 803 | num_sec = elf_numsections (abfd); |
| 804 | for (shindex = 1; shindex < num_sec; shindex++) |
| 805 | { |
| 806 | if (! bfd_section_from_shdr (abfd, shindex)) |
| 807 | goto got_no_match; |
| 808 | if (shindex == SHN_LORESERVE - 1) |
| 809 | shindex += SHN_HIRESERVE + 1 - SHN_LORESERVE; |
| 810 | } |
| 811 | } |
| 812 | |
| 813 | /* Let the backend double check the format and override global |
| 814 | information. */ |
| 815 | if (ebd->elf_backend_object_p) |
| 816 | { |
| 817 | if ((*ebd->elf_backend_object_p) (abfd) == false) |
| 818 | goto got_wrong_format_error; |
| 819 | } |
| 820 | |
| 821 | /* If we have created any reloc sections that are associated with |
| 822 | debugging sections, mark the reloc sections as debugging as well. */ |
| 823 | for (s = abfd->sections; s != NULL; s = s->next) |
| 824 | { |
| 825 | if ((elf_section_data (s)->this_hdr.sh_type == SHT_REL |
| 826 | || elf_section_data (s)->this_hdr.sh_type == SHT_RELA) |
| 827 | && elf_section_data (s)->this_hdr.sh_info > 0) |
| 828 | { |
| 829 | unsigned long targ_index; |
| 830 | asection *targ_sec; |
| 831 | |
| 832 | targ_index = elf_section_data (s)->this_hdr.sh_info; |
| 833 | targ_sec = bfd_section_from_elf_index (abfd, targ_index); |
| 834 | if (targ_sec != NULL |
| 835 | && (targ_sec->flags & SEC_DEBUGGING) != 0) |
| 836 | s->flags |= SEC_DEBUGGING; |
| 837 | } |
| 838 | } |
| 839 | |
| 840 | /* It would be nice to be able to free more memory here, eg. old |
| 841 | elf_elfsections, old tdata, but that's not possible since these |
| 842 | blocks are sitting inside obj_alloc'd memory. */ |
| 843 | bfd_hash_table_free (&preserve.section_htab); |
| 844 | return (abfd->xvec); |
| 845 | |
| 846 | got_wrong_format_error: |
| 847 | /* There is way too much undoing of half-known state here. The caller, |
| 848 | bfd_check_format_matches, really shouldn't iterate on live bfd's to |
| 849 | check match/no-match like it does. We have to rely on that a call to |
| 850 | bfd_default_set_arch_mach with the previously known mach, undoes what |
| 851 | was done by the first bfd_default_set_arch_mach (with mach 0) here. |
| 852 | For this to work, only elf-data and the mach may be changed by the |
| 853 | target-specific elf_backend_object_p function. Note that saving the |
| 854 | whole bfd here and restoring it would be even worse; the first thing |
| 855 | you notice is that the cached bfd file position gets out of sync. */ |
| 856 | bfd_set_error (bfd_error_wrong_format); |
| 857 | |
| 858 | got_no_match: |
| 859 | abfd->arch_info = preserve.arch_info; |
| 860 | if (new_tdata != NULL) |
| 861 | { |
| 862 | /* bfd_release frees all memory more recently bfd_alloc'd than |
| 863 | its arg, as well as its arg. */ |
| 864 | bfd_release (abfd, new_tdata); |
| 865 | elf_tdata (abfd) = preserve.tdata; |
| 866 | abfd->section_htab = preserve.section_htab; |
| 867 | abfd->sections = preserve.sections; |
| 868 | abfd->section_tail = preserve.section_tail; |
| 869 | abfd->section_count = preserve.section_count; |
| 870 | } |
| 871 | return NULL; |
| 872 | } |
| 873 | \f |
| 874 | /* ELF .o/exec file writing */ |
| 875 | |
| 876 | /* Write out the relocs. */ |
| 877 | |
| 878 | void |
| 879 | elf_write_relocs (abfd, sec, data) |
| 880 | bfd *abfd; |
| 881 | asection *sec; |
| 882 | PTR data; |
| 883 | { |
| 884 | boolean *failedp = (boolean *) data; |
| 885 | Elf_Internal_Shdr *rela_hdr; |
| 886 | Elf_External_Rela *outbound_relocas; |
| 887 | Elf_External_Rel *outbound_relocs; |
| 888 | unsigned int idx; |
| 889 | int use_rela_p; |
| 890 | asymbol *last_sym = 0; |
| 891 | int last_sym_idx = 0; |
| 892 | |
| 893 | /* If we have already failed, don't do anything. */ |
| 894 | if (*failedp) |
| 895 | return; |
| 896 | |
| 897 | if ((sec->flags & SEC_RELOC) == 0) |
| 898 | return; |
| 899 | |
| 900 | /* The linker backend writes the relocs out itself, and sets the |
| 901 | reloc_count field to zero to inhibit writing them here. Also, |
| 902 | sometimes the SEC_RELOC flag gets set even when there aren't any |
| 903 | relocs. */ |
| 904 | if (sec->reloc_count == 0) |
| 905 | return; |
| 906 | |
| 907 | rela_hdr = &elf_section_data (sec)->rel_hdr; |
| 908 | |
| 909 | rela_hdr->sh_size = rela_hdr->sh_entsize * sec->reloc_count; |
| 910 | rela_hdr->contents = (PTR) bfd_alloc (abfd, rela_hdr->sh_size); |
| 911 | if (rela_hdr->contents == NULL) |
| 912 | { |
| 913 | *failedp = true; |
| 914 | return; |
| 915 | } |
| 916 | |
| 917 | /* Figure out whether the relocations are RELA or REL relocations. */ |
| 918 | if (rela_hdr->sh_type == SHT_RELA) |
| 919 | use_rela_p = true; |
| 920 | else if (rela_hdr->sh_type == SHT_REL) |
| 921 | use_rela_p = false; |
| 922 | else |
| 923 | /* Every relocation section should be either an SHT_RELA or an |
| 924 | SHT_REL section. */ |
| 925 | abort (); |
| 926 | |
| 927 | /* orelocation has the data, reloc_count has the count... */ |
| 928 | if (use_rela_p) |
| 929 | { |
| 930 | outbound_relocas = (Elf_External_Rela *) rela_hdr->contents; |
| 931 | |
| 932 | for (idx = 0; idx < sec->reloc_count; idx++) |
| 933 | { |
| 934 | Elf_Internal_Rela dst_rela; |
| 935 | Elf_External_Rela *src_rela; |
| 936 | arelent *ptr; |
| 937 | asymbol *sym; |
| 938 | int n; |
| 939 | |
| 940 | ptr = sec->orelocation[idx]; |
| 941 | src_rela = outbound_relocas + idx; |
| 942 | |
| 943 | /* The address of an ELF reloc is section relative for an object |
| 944 | file, and absolute for an executable file or shared library. |
| 945 | The address of a BFD reloc is always section relative. */ |
| 946 | if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0) |
| 947 | dst_rela.r_offset = ptr->address; |
| 948 | else |
| 949 | dst_rela.r_offset = ptr->address + sec->vma; |
| 950 | |
| 951 | sym = *ptr->sym_ptr_ptr; |
| 952 | if (sym == last_sym) |
| 953 | n = last_sym_idx; |
| 954 | else if (bfd_is_abs_section (sym->section) && sym->value == 0) |
| 955 | n = STN_UNDEF; |
| 956 | else |
| 957 | { |
| 958 | last_sym = sym; |
| 959 | n = _bfd_elf_symbol_from_bfd_symbol (abfd, &sym); |
| 960 | if (n < 0) |
| 961 | { |
| 962 | *failedp = true; |
| 963 | return; |
| 964 | } |
| 965 | last_sym_idx = n; |
| 966 | } |
| 967 | |
| 968 | if ((*ptr->sym_ptr_ptr)->the_bfd != NULL |
| 969 | && (*ptr->sym_ptr_ptr)->the_bfd->xvec != abfd->xvec |
| 970 | && ! _bfd_elf_validate_reloc (abfd, ptr)) |
| 971 | { |
| 972 | *failedp = true; |
| 973 | return; |
| 974 | } |
| 975 | |
| 976 | dst_rela.r_info = ELF_R_INFO (n, ptr->howto->type); |
| 977 | |
| 978 | dst_rela.r_addend = ptr->addend; |
| 979 | elf_swap_reloca_out (abfd, &dst_rela, src_rela); |
| 980 | } |
| 981 | } |
| 982 | else |
| 983 | /* REL relocations */ |
| 984 | { |
| 985 | outbound_relocs = (Elf_External_Rel *) rela_hdr->contents; |
| 986 | |
| 987 | for (idx = 0; idx < sec->reloc_count; idx++) |
| 988 | { |
| 989 | Elf_Internal_Rel dst_rel; |
| 990 | Elf_External_Rel *src_rel; |
| 991 | arelent *ptr; |
| 992 | int n; |
| 993 | asymbol *sym; |
| 994 | |
| 995 | ptr = sec->orelocation[idx]; |
| 996 | sym = *ptr->sym_ptr_ptr; |
| 997 | src_rel = outbound_relocs + idx; |
| 998 | |
| 999 | /* The address of an ELF reloc is section relative for an object |
| 1000 | file, and absolute for an executable file or shared library. |
| 1001 | The address of a BFD reloc is always section relative. */ |
| 1002 | if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0) |
| 1003 | dst_rel.r_offset = ptr->address; |
| 1004 | else |
| 1005 | dst_rel.r_offset = ptr->address + sec->vma; |
| 1006 | |
| 1007 | if (sym == last_sym) |
| 1008 | n = last_sym_idx; |
| 1009 | else if (bfd_is_abs_section (sym->section) && sym->value == 0) |
| 1010 | n = STN_UNDEF; |
| 1011 | else |
| 1012 | { |
| 1013 | last_sym = sym; |
| 1014 | n = _bfd_elf_symbol_from_bfd_symbol (abfd, &sym); |
| 1015 | if (n < 0) |
| 1016 | { |
| 1017 | *failedp = true; |
| 1018 | return; |
| 1019 | } |
| 1020 | last_sym_idx = n; |
| 1021 | } |
| 1022 | |
| 1023 | if ((*ptr->sym_ptr_ptr)->the_bfd != NULL |
| 1024 | && (*ptr->sym_ptr_ptr)->the_bfd->xvec != abfd->xvec |
| 1025 | && ! _bfd_elf_validate_reloc (abfd, ptr)) |
| 1026 | { |
| 1027 | *failedp = true; |
| 1028 | return; |
| 1029 | } |
| 1030 | |
| 1031 | dst_rel.r_info = ELF_R_INFO (n, ptr->howto->type); |
| 1032 | |
| 1033 | elf_swap_reloc_out (abfd, &dst_rel, src_rel); |
| 1034 | } |
| 1035 | } |
| 1036 | } |
| 1037 | |
| 1038 | /* Write out the program headers. */ |
| 1039 | |
| 1040 | int |
| 1041 | elf_write_out_phdrs (abfd, phdr, count) |
| 1042 | bfd *abfd; |
| 1043 | const Elf_Internal_Phdr *phdr; |
| 1044 | unsigned int count; |
| 1045 | { |
| 1046 | while (count--) |
| 1047 | { |
| 1048 | Elf_External_Phdr extphdr; |
| 1049 | elf_swap_phdr_out (abfd, phdr, &extphdr); |
| 1050 | if (bfd_bwrite (&extphdr, (bfd_size_type) sizeof (Elf_External_Phdr), |
| 1051 | abfd) != sizeof (Elf_External_Phdr)) |
| 1052 | return -1; |
| 1053 | phdr++; |
| 1054 | } |
| 1055 | return 0; |
| 1056 | } |
| 1057 | |
| 1058 | /* Write out the section headers and the ELF file header. */ |
| 1059 | |
| 1060 | boolean |
| 1061 | elf_write_shdrs_and_ehdr (abfd) |
| 1062 | bfd *abfd; |
| 1063 | { |
| 1064 | Elf_External_Ehdr x_ehdr; /* Elf file header, external form */ |
| 1065 | Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */ |
| 1066 | Elf_External_Shdr *x_shdrp; /* Section header table, external form */ |
| 1067 | Elf_Internal_Shdr **i_shdrp; /* Section header table, internal form */ |
| 1068 | unsigned int count; |
| 1069 | bfd_size_type amt; |
| 1070 | |
| 1071 | i_ehdrp = elf_elfheader (abfd); |
| 1072 | i_shdrp = elf_elfsections (abfd); |
| 1073 | |
| 1074 | /* swap the header before spitting it out... */ |
| 1075 | |
| 1076 | #if DEBUG & 1 |
| 1077 | elf_debug_file (i_ehdrp); |
| 1078 | #endif |
| 1079 | elf_swap_ehdr_out (abfd, i_ehdrp, &x_ehdr); |
| 1080 | amt = sizeof (x_ehdr); |
| 1081 | if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0 |
| 1082 | || bfd_bwrite ((PTR) & x_ehdr, amt, abfd) != amt) |
| 1083 | return false; |
| 1084 | |
| 1085 | /* Some fields in the first section header handle overflow of ehdr |
| 1086 | fields. */ |
| 1087 | if (i_ehdrp->e_shnum >= SHN_LORESERVE) |
| 1088 | i_shdrp[0]->sh_size = i_ehdrp->e_shnum; |
| 1089 | if (i_ehdrp->e_shstrndx >= SHN_LORESERVE) |
| 1090 | i_shdrp[0]->sh_link = i_ehdrp->e_shstrndx; |
| 1091 | |
| 1092 | /* at this point we've concocted all the ELF sections... */ |
| 1093 | amt = i_ehdrp->e_shnum; |
| 1094 | amt *= sizeof (*x_shdrp); |
| 1095 | x_shdrp = (Elf_External_Shdr *) bfd_alloc (abfd, amt); |
| 1096 | if (!x_shdrp) |
| 1097 | return false; |
| 1098 | |
| 1099 | for (count = 0; count < i_ehdrp->e_shnum; i_shdrp++, count++) |
| 1100 | { |
| 1101 | #if DEBUG & 2 |
| 1102 | elf_debug_section (count, *i_shdrp); |
| 1103 | #endif |
| 1104 | elf_swap_shdr_out (abfd, *i_shdrp, x_shdrp + count); |
| 1105 | |
| 1106 | if (count == SHN_LORESERVE - 1) |
| 1107 | i_shdrp += SHN_HIRESERVE + 1 - SHN_LORESERVE; |
| 1108 | } |
| 1109 | if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_shoff, SEEK_SET) != 0 |
| 1110 | || bfd_bwrite ((PTR) x_shdrp, amt, abfd) != amt) |
| 1111 | return false; |
| 1112 | |
| 1113 | /* need to dump the string table too... */ |
| 1114 | |
| 1115 | return true; |
| 1116 | } |
| 1117 | |
| 1118 | long |
| 1119 | elf_slurp_symbol_table (abfd, symptrs, dynamic) |
| 1120 | bfd *abfd; |
| 1121 | asymbol **symptrs; /* Buffer for generated bfd symbols */ |
| 1122 | boolean dynamic; |
| 1123 | { |
| 1124 | Elf_Internal_Shdr *hdr; |
| 1125 | Elf_Internal_Shdr *verhdr; |
| 1126 | unsigned long symcount; /* Number of external ELF symbols */ |
| 1127 | elf_symbol_type *sym; /* Pointer to current bfd symbol */ |
| 1128 | elf_symbol_type *symbase; /* Buffer for generated bfd symbols */ |
| 1129 | Elf_Internal_Sym i_sym; |
| 1130 | Elf_External_Sym *x_symp = NULL; |
| 1131 | Elf_External_Sym_Shndx *x_shndx = NULL; |
| 1132 | Elf_External_Versym *x_versymp = NULL; |
| 1133 | bfd_size_type amt; |
| 1134 | |
| 1135 | /* Read each raw ELF symbol, converting from external ELF form to |
| 1136 | internal ELF form, and then using the information to create a |
| 1137 | canonical bfd symbol table entry. |
| 1138 | |
| 1139 | Note that we allocate the initial bfd canonical symbol buffer |
| 1140 | based on a one-to-one mapping of the ELF symbols to canonical |
| 1141 | symbols. We actually use all the ELF symbols, so there will be no |
| 1142 | space left over at the end. When we have all the symbols, we |
| 1143 | build the caller's pointer vector. */ |
| 1144 | |
| 1145 | if (! dynamic) |
| 1146 | { |
| 1147 | Elf_Internal_Shdr *shndx_hdr; |
| 1148 | |
| 1149 | hdr = &elf_tdata (abfd)->symtab_hdr; |
| 1150 | shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr; |
| 1151 | verhdr = NULL; |
| 1152 | |
| 1153 | /* If we have a SHT_SYMTAB_SHNDX section for the symbol table, |
| 1154 | read the raw contents. */ |
| 1155 | if (elf_elfsections (abfd) != NULL |
| 1156 | && elf_elfsections (abfd)[shndx_hdr->sh_link] == hdr) |
| 1157 | { |
| 1158 | amt = shndx_hdr->sh_size; |
| 1159 | x_shndx = (Elf_External_Sym_Shndx *) bfd_malloc (amt); |
| 1160 | if (x_shndx == NULL |
| 1161 | || bfd_seek (abfd, shndx_hdr->sh_offset, SEEK_SET) != 0 |
| 1162 | || bfd_bread ((PTR) x_shndx, amt, abfd) != amt) |
| 1163 | goto error_return; |
| 1164 | } |
| 1165 | } |
| 1166 | else |
| 1167 | { |
| 1168 | hdr = &elf_tdata (abfd)->dynsymtab_hdr; |
| 1169 | if (elf_dynversym (abfd) == 0) |
| 1170 | verhdr = NULL; |
| 1171 | else |
| 1172 | verhdr = &elf_tdata (abfd)->dynversym_hdr; |
| 1173 | if ((elf_tdata (abfd)->dynverdef_section != 0 |
| 1174 | && elf_tdata (abfd)->verdef == NULL) |
| 1175 | || (elf_tdata (abfd)->dynverref_section != 0 |
| 1176 | && elf_tdata (abfd)->verref == NULL)) |
| 1177 | { |
| 1178 | if (! _bfd_elf_slurp_version_tables (abfd)) |
| 1179 | return -1; |
| 1180 | } |
| 1181 | } |
| 1182 | |
| 1183 | if (bfd_seek (abfd, hdr->sh_offset, SEEK_SET) != 0) |
| 1184 | goto error_return; |
| 1185 | |
| 1186 | symcount = hdr->sh_size / sizeof (Elf_External_Sym); |
| 1187 | |
| 1188 | if (symcount == 0) |
| 1189 | sym = symbase = NULL; |
| 1190 | else |
| 1191 | { |
| 1192 | unsigned long i; |
| 1193 | |
| 1194 | if (bfd_seek (abfd, hdr->sh_offset, SEEK_SET) != 0) |
| 1195 | goto error_return; |
| 1196 | |
| 1197 | amt = symcount; |
| 1198 | amt *= sizeof (elf_symbol_type); |
| 1199 | symbase = (elf_symbol_type *) bfd_zalloc (abfd, amt); |
| 1200 | if (symbase == (elf_symbol_type *) NULL) |
| 1201 | goto error_return; |
| 1202 | sym = symbase; |
| 1203 | |
| 1204 | /* Temporarily allocate room for the raw ELF symbols. */ |
| 1205 | amt = symcount; |
| 1206 | amt *= sizeof (Elf_External_Sym); |
| 1207 | x_symp = (Elf_External_Sym *) bfd_malloc (amt); |
| 1208 | if (x_symp == NULL) |
| 1209 | goto error_return; |
| 1210 | |
| 1211 | if (bfd_bread ((PTR) x_symp, amt, abfd) != amt) |
| 1212 | goto error_return; |
| 1213 | |
| 1214 | /* Read the raw ELF version symbol information. */ |
| 1215 | |
| 1216 | if (verhdr != NULL |
| 1217 | && verhdr->sh_size / sizeof (Elf_External_Versym) != symcount) |
| 1218 | { |
| 1219 | (*_bfd_error_handler) |
| 1220 | (_("%s: version count (%ld) does not match symbol count (%ld)"), |
| 1221 | abfd->filename, |
| 1222 | (long) (verhdr->sh_size / sizeof (Elf_External_Versym)), |
| 1223 | symcount); |
| 1224 | |
| 1225 | /* Slurp in the symbols without the version information, |
| 1226 | since that is more helpful than just quitting. */ |
| 1227 | verhdr = NULL; |
| 1228 | } |
| 1229 | |
| 1230 | if (verhdr != NULL) |
| 1231 | { |
| 1232 | if (bfd_seek (abfd, verhdr->sh_offset, SEEK_SET) != 0) |
| 1233 | goto error_return; |
| 1234 | |
| 1235 | x_versymp = (Elf_External_Versym *) bfd_malloc (verhdr->sh_size); |
| 1236 | if (x_versymp == NULL && verhdr->sh_size != 0) |
| 1237 | goto error_return; |
| 1238 | |
| 1239 | if (bfd_bread ((PTR) x_versymp, verhdr->sh_size, abfd) |
| 1240 | != verhdr->sh_size) |
| 1241 | goto error_return; |
| 1242 | } |
| 1243 | |
| 1244 | /* Skip first symbol, which is a null dummy. */ |
| 1245 | for (i = 1; i < symcount; i++) |
| 1246 | { |
| 1247 | elf_swap_symbol_in (abfd, (const PTR) (x_symp + i), |
| 1248 | (const PTR) (x_shndx + (x_shndx ? i : 0)), |
| 1249 | &i_sym); |
| 1250 | memcpy (&sym->internal_elf_sym, &i_sym, sizeof (Elf_Internal_Sym)); |
| 1251 | #ifdef ELF_KEEP_EXTSYM |
| 1252 | memcpy (&sym->native_elf_sym, x_symp + i, sizeof (Elf_External_Sym)); |
| 1253 | #endif |
| 1254 | sym->symbol.the_bfd = abfd; |
| 1255 | |
| 1256 | sym->symbol.name = bfd_elf_string_from_elf_section (abfd, |
| 1257 | hdr->sh_link, |
| 1258 | i_sym.st_name); |
| 1259 | |
| 1260 | sym->symbol.value = i_sym.st_value; |
| 1261 | |
| 1262 | if (i_sym.st_shndx == SHN_UNDEF) |
| 1263 | { |
| 1264 | sym->symbol.section = bfd_und_section_ptr; |
| 1265 | } |
| 1266 | else if (i_sym.st_shndx < SHN_LORESERVE |
| 1267 | || i_sym.st_shndx > SHN_HIRESERVE) |
| 1268 | { |
| 1269 | sym->symbol.section = section_from_elf_index (abfd, |
| 1270 | i_sym.st_shndx); |
| 1271 | if (sym->symbol.section == NULL) |
| 1272 | { |
| 1273 | /* This symbol is in a section for which we did not |
| 1274 | create a BFD section. Just use bfd_abs_section, |
| 1275 | although it is wrong. FIXME. */ |
| 1276 | sym->symbol.section = bfd_abs_section_ptr; |
| 1277 | } |
| 1278 | } |
| 1279 | else if (i_sym.st_shndx == SHN_ABS) |
| 1280 | { |
| 1281 | sym->symbol.section = bfd_abs_section_ptr; |
| 1282 | } |
| 1283 | else if (i_sym.st_shndx == SHN_COMMON) |
| 1284 | { |
| 1285 | sym->symbol.section = bfd_com_section_ptr; |
| 1286 | /* Elf puts the alignment into the `value' field, and |
| 1287 | the size into the `size' field. BFD wants to see the |
| 1288 | size in the value field, and doesn't care (at the |
| 1289 | moment) about the alignment. */ |
| 1290 | sym->symbol.value = i_sym.st_size; |
| 1291 | } |
| 1292 | else |
| 1293 | sym->symbol.section = bfd_abs_section_ptr; |
| 1294 | |
| 1295 | /* If this is a relocateable file, then the symbol value is |
| 1296 | already section relative. */ |
| 1297 | if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0) |
| 1298 | sym->symbol.value -= sym->symbol.section->vma; |
| 1299 | |
| 1300 | switch (ELF_ST_BIND (i_sym.st_info)) |
| 1301 | { |
| 1302 | case STB_LOCAL: |
| 1303 | sym->symbol.flags |= BSF_LOCAL; |
| 1304 | break; |
| 1305 | case STB_GLOBAL: |
| 1306 | if (i_sym.st_shndx != SHN_UNDEF |
| 1307 | && i_sym.st_shndx != SHN_COMMON) |
| 1308 | sym->symbol.flags |= BSF_GLOBAL; |
| 1309 | break; |
| 1310 | case STB_WEAK: |
| 1311 | sym->symbol.flags |= BSF_WEAK; |
| 1312 | break; |
| 1313 | } |
| 1314 | |
| 1315 | switch (ELF_ST_TYPE (i_sym.st_info)) |
| 1316 | { |
| 1317 | case STT_SECTION: |
| 1318 | sym->symbol.flags |= BSF_SECTION_SYM | BSF_DEBUGGING; |
| 1319 | break; |
| 1320 | case STT_FILE: |
| 1321 | sym->symbol.flags |= BSF_FILE | BSF_DEBUGGING; |
| 1322 | break; |
| 1323 | case STT_FUNC: |
| 1324 | sym->symbol.flags |= BSF_FUNCTION; |
| 1325 | break; |
| 1326 | case STT_OBJECT: |
| 1327 | sym->symbol.flags |= BSF_OBJECT; |
| 1328 | break; |
| 1329 | } |
| 1330 | |
| 1331 | if (dynamic) |
| 1332 | sym->symbol.flags |= BSF_DYNAMIC; |
| 1333 | |
| 1334 | if (x_versymp != NULL) |
| 1335 | { |
| 1336 | Elf_Internal_Versym iversym; |
| 1337 | |
| 1338 | _bfd_elf_swap_versym_in (abfd, x_versymp + i, &iversym); |
| 1339 | sym->version = iversym.vs_vers; |
| 1340 | } |
| 1341 | |
| 1342 | /* Do some backend-specific processing on this symbol. */ |
| 1343 | { |
| 1344 | struct elf_backend_data *ebd = get_elf_backend_data (abfd); |
| 1345 | if (ebd->elf_backend_symbol_processing) |
| 1346 | (*ebd->elf_backend_symbol_processing) (abfd, &sym->symbol); |
| 1347 | } |
| 1348 | |
| 1349 | sym++; |
| 1350 | } |
| 1351 | } |
| 1352 | |
| 1353 | /* Do some backend-specific processing on this symbol table. */ |
| 1354 | { |
| 1355 | struct elf_backend_data *ebd = get_elf_backend_data (abfd); |
| 1356 | if (ebd->elf_backend_symbol_table_processing) |
| 1357 | (*ebd->elf_backend_symbol_table_processing) (abfd, symbase, symcount); |
| 1358 | } |
| 1359 | |
| 1360 | /* We rely on the zalloc to clear out the final symbol entry. */ |
| 1361 | |
| 1362 | symcount = sym - symbase; |
| 1363 | |
| 1364 | /* Fill in the user's symbol pointer vector if needed. */ |
| 1365 | if (symptrs) |
| 1366 | { |
| 1367 | long l = symcount; |
| 1368 | |
| 1369 | sym = symbase; |
| 1370 | while (l-- > 0) |
| 1371 | { |
| 1372 | *symptrs++ = &sym->symbol; |
| 1373 | sym++; |
| 1374 | } |
| 1375 | *symptrs = 0; /* Final null pointer */ |
| 1376 | } |
| 1377 | |
| 1378 | if (x_shndx != NULL) |
| 1379 | free (x_shndx); |
| 1380 | if (x_versymp != NULL) |
| 1381 | free (x_versymp); |
| 1382 | if (x_symp != NULL) |
| 1383 | free (x_symp); |
| 1384 | return symcount; |
| 1385 | |
| 1386 | error_return: |
| 1387 | if (x_shndx != NULL) |
| 1388 | free (x_shndx); |
| 1389 | if (x_versymp != NULL) |
| 1390 | free (x_versymp); |
| 1391 | if (x_symp != NULL) |
| 1392 | free (x_symp); |
| 1393 | return -1; |
| 1394 | } |
| 1395 | |
| 1396 | /* Read relocations for ASECT from REL_HDR. There are RELOC_COUNT of |
| 1397 | them. */ |
| 1398 | |
| 1399 | static boolean |
| 1400 | elf_slurp_reloc_table_from_section (abfd, asect, rel_hdr, reloc_count, |
| 1401 | relents, symbols, dynamic) |
| 1402 | bfd *abfd; |
| 1403 | asection *asect; |
| 1404 | Elf_Internal_Shdr *rel_hdr; |
| 1405 | bfd_size_type reloc_count; |
| 1406 | arelent *relents; |
| 1407 | asymbol **symbols; |
| 1408 | boolean dynamic; |
| 1409 | { |
| 1410 | struct elf_backend_data * const ebd = get_elf_backend_data (abfd); |
| 1411 | PTR allocated = NULL; |
| 1412 | bfd_byte *native_relocs; |
| 1413 | arelent *relent; |
| 1414 | unsigned int i; |
| 1415 | int entsize; |
| 1416 | |
| 1417 | allocated = (PTR) bfd_malloc (rel_hdr->sh_size); |
| 1418 | if (allocated == NULL) |
| 1419 | goto error_return; |
| 1420 | |
| 1421 | if (bfd_seek (abfd, rel_hdr->sh_offset, SEEK_SET) != 0 |
| 1422 | || (bfd_bread (allocated, rel_hdr->sh_size, abfd) |
| 1423 | != rel_hdr->sh_size)) |
| 1424 | goto error_return; |
| 1425 | |
| 1426 | native_relocs = (bfd_byte *) allocated; |
| 1427 | |
| 1428 | entsize = rel_hdr->sh_entsize; |
| 1429 | BFD_ASSERT (entsize == sizeof (Elf_External_Rel) |
| 1430 | || entsize == sizeof (Elf_External_Rela)); |
| 1431 | |
| 1432 | for (i = 0, relent = relents; |
| 1433 | i < reloc_count; |
| 1434 | i++, relent++, native_relocs += entsize) |
| 1435 | { |
| 1436 | Elf_Internal_Rela rela; |
| 1437 | Elf_Internal_Rel rel; |
| 1438 | |
| 1439 | if (entsize == sizeof (Elf_External_Rela)) |
| 1440 | elf_swap_reloca_in (abfd, (Elf_External_Rela *) native_relocs, &rela); |
| 1441 | else |
| 1442 | { |
| 1443 | elf_swap_reloc_in (abfd, (Elf_External_Rel *) native_relocs, &rel); |
| 1444 | rela.r_offset = rel.r_offset; |
| 1445 | rela.r_info = rel.r_info; |
| 1446 | rela.r_addend = 0; |
| 1447 | } |
| 1448 | |
| 1449 | /* The address of an ELF reloc is section relative for an object |
| 1450 | file, and absolute for an executable file or shared library. |
| 1451 | The address of a normal BFD reloc is always section relative, |
| 1452 | and the address of a dynamic reloc is absolute.. */ |
| 1453 | if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0 || dynamic) |
| 1454 | relent->address = rela.r_offset; |
| 1455 | else |
| 1456 | relent->address = rela.r_offset - asect->vma; |
| 1457 | |
| 1458 | if (ELF_R_SYM (rela.r_info) == 0) |
| 1459 | relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr; |
| 1460 | else |
| 1461 | { |
| 1462 | asymbol **ps, *s; |
| 1463 | |
| 1464 | ps = symbols + ELF_R_SYM (rela.r_info) - 1; |
| 1465 | s = *ps; |
| 1466 | |
| 1467 | /* Canonicalize ELF section symbols. FIXME: Why? */ |
| 1468 | if ((s->flags & BSF_SECTION_SYM) == 0) |
| 1469 | relent->sym_ptr_ptr = ps; |
| 1470 | else |
| 1471 | relent->sym_ptr_ptr = s->section->symbol_ptr_ptr; |
| 1472 | } |
| 1473 | |
| 1474 | relent->addend = rela.r_addend; |
| 1475 | |
| 1476 | if (entsize == sizeof (Elf_External_Rela)) |
| 1477 | (*ebd->elf_info_to_howto) (abfd, relent, &rela); |
| 1478 | else |
| 1479 | (*ebd->elf_info_to_howto_rel) (abfd, relent, &rel); |
| 1480 | } |
| 1481 | |
| 1482 | if (allocated != NULL) |
| 1483 | free (allocated); |
| 1484 | |
| 1485 | return true; |
| 1486 | |
| 1487 | error_return: |
| 1488 | if (allocated != NULL) |
| 1489 | free (allocated); |
| 1490 | return false; |
| 1491 | } |
| 1492 | |
| 1493 | /* Read in and swap the external relocs. */ |
| 1494 | |
| 1495 | boolean |
| 1496 | elf_slurp_reloc_table (abfd, asect, symbols, dynamic) |
| 1497 | bfd *abfd; |
| 1498 | asection *asect; |
| 1499 | asymbol **symbols; |
| 1500 | boolean dynamic; |
| 1501 | { |
| 1502 | struct bfd_elf_section_data * const d = elf_section_data (asect); |
| 1503 | Elf_Internal_Shdr *rel_hdr; |
| 1504 | Elf_Internal_Shdr *rel_hdr2; |
| 1505 | bfd_size_type reloc_count; |
| 1506 | bfd_size_type reloc_count2; |
| 1507 | arelent *relents; |
| 1508 | bfd_size_type amt; |
| 1509 | |
| 1510 | if (asect->relocation != NULL) |
| 1511 | return true; |
| 1512 | |
| 1513 | if (! dynamic) |
| 1514 | { |
| 1515 | if ((asect->flags & SEC_RELOC) == 0 |
| 1516 | || asect->reloc_count == 0) |
| 1517 | return true; |
| 1518 | |
| 1519 | rel_hdr = &d->rel_hdr; |
| 1520 | reloc_count = NUM_SHDR_ENTRIES (rel_hdr); |
| 1521 | rel_hdr2 = d->rel_hdr2; |
| 1522 | reloc_count2 = (rel_hdr2 ? NUM_SHDR_ENTRIES (rel_hdr2) : 0); |
| 1523 | |
| 1524 | BFD_ASSERT (asect->reloc_count == reloc_count + reloc_count2); |
| 1525 | BFD_ASSERT (asect->rel_filepos == rel_hdr->sh_offset |
| 1526 | || (rel_hdr2 && asect->rel_filepos == rel_hdr2->sh_offset)); |
| 1527 | |
| 1528 | } |
| 1529 | else |
| 1530 | { |
| 1531 | /* Note that ASECT->RELOC_COUNT tends not to be accurate in this |
| 1532 | case because relocations against this section may use the |
| 1533 | dynamic symbol table, and in that case bfd_section_from_shdr |
| 1534 | in elf.c does not update the RELOC_COUNT. */ |
| 1535 | if (asect->_raw_size == 0) |
| 1536 | return true; |
| 1537 | |
| 1538 | rel_hdr = &d->this_hdr; |
| 1539 | reloc_count = NUM_SHDR_ENTRIES (rel_hdr); |
| 1540 | rel_hdr2 = NULL; |
| 1541 | reloc_count2 = 0; |
| 1542 | } |
| 1543 | |
| 1544 | amt = (reloc_count + reloc_count2) * sizeof (arelent); |
| 1545 | relents = (arelent *) bfd_alloc (abfd, amt); |
| 1546 | if (relents == NULL) |
| 1547 | return false; |
| 1548 | |
| 1549 | if (!elf_slurp_reloc_table_from_section (abfd, asect, |
| 1550 | rel_hdr, reloc_count, |
| 1551 | relents, |
| 1552 | symbols, dynamic)) |
| 1553 | return false; |
| 1554 | |
| 1555 | if (rel_hdr2 |
| 1556 | && !elf_slurp_reloc_table_from_section (abfd, asect, |
| 1557 | rel_hdr2, reloc_count2, |
| 1558 | relents + reloc_count, |
| 1559 | symbols, dynamic)) |
| 1560 | return false; |
| 1561 | |
| 1562 | asect->relocation = relents; |
| 1563 | return true; |
| 1564 | } |
| 1565 | |
| 1566 | #ifdef DEBUG |
| 1567 | static void |
| 1568 | elf_debug_section (num, hdr) |
| 1569 | int num; |
| 1570 | Elf_Internal_Shdr *hdr; |
| 1571 | { |
| 1572 | fprintf (stderr, "\nSection#%d '%s' 0x%.8lx\n", num, |
| 1573 | hdr->bfd_section != NULL ? hdr->bfd_section->name : "", |
| 1574 | (long) hdr); |
| 1575 | fprintf (stderr, |
| 1576 | "sh_name = %ld\tsh_type = %ld\tsh_flags = %ld\n", |
| 1577 | (long) hdr->sh_name, |
| 1578 | (long) hdr->sh_type, |
| 1579 | (long) hdr->sh_flags); |
| 1580 | fprintf (stderr, |
| 1581 | "sh_addr = %ld\tsh_offset = %ld\tsh_size = %ld\n", |
| 1582 | (long) hdr->sh_addr, |
| 1583 | (long) hdr->sh_offset, |
| 1584 | (long) hdr->sh_size); |
| 1585 | fprintf (stderr, |
| 1586 | "sh_link = %ld\tsh_info = %ld\tsh_addralign = %ld\n", |
| 1587 | (long) hdr->sh_link, |
| 1588 | (long) hdr->sh_info, |
| 1589 | (long) hdr->sh_addralign); |
| 1590 | fprintf (stderr, "sh_entsize = %ld\n", |
| 1591 | (long) hdr->sh_entsize); |
| 1592 | fflush (stderr); |
| 1593 | } |
| 1594 | |
| 1595 | static void |
| 1596 | elf_debug_file (ehdrp) |
| 1597 | Elf_Internal_Ehdr *ehdrp; |
| 1598 | { |
| 1599 | fprintf (stderr, "e_entry = 0x%.8lx\n", (long) ehdrp->e_entry); |
| 1600 | fprintf (stderr, "e_phoff = %ld\n", (long) ehdrp->e_phoff); |
| 1601 | fprintf (stderr, "e_phnum = %ld\n", (long) ehdrp->e_phnum); |
| 1602 | fprintf (stderr, "e_phentsize = %ld\n", (long) ehdrp->e_phentsize); |
| 1603 | fprintf (stderr, "e_shoff = %ld\n", (long) ehdrp->e_shoff); |
| 1604 | fprintf (stderr, "e_shnum = %ld\n", (long) ehdrp->e_shnum); |
| 1605 | fprintf (stderr, "e_shentsize = %ld\n", (long) ehdrp->e_shentsize); |
| 1606 | } |
| 1607 | |
| 1608 | static char * |
| 1609 | elf_symbol_flags (flags) |
| 1610 | flagword flags; |
| 1611 | { |
| 1612 | static char buffer[1024]; |
| 1613 | |
| 1614 | buffer[0] = '\0'; |
| 1615 | if (flags & BSF_LOCAL) |
| 1616 | strcat (buffer, " local"); |
| 1617 | |
| 1618 | if (flags & BSF_GLOBAL) |
| 1619 | strcat (buffer, " global"); |
| 1620 | |
| 1621 | if (flags & BSF_DEBUGGING) |
| 1622 | strcat (buffer, " debug"); |
| 1623 | |
| 1624 | if (flags & BSF_FUNCTION) |
| 1625 | strcat (buffer, " function"); |
| 1626 | |
| 1627 | if (flags & BSF_KEEP) |
| 1628 | strcat (buffer, " keep"); |
| 1629 | |
| 1630 | if (flags & BSF_KEEP_G) |
| 1631 | strcat (buffer, " keep_g"); |
| 1632 | |
| 1633 | if (flags & BSF_WEAK) |
| 1634 | strcat (buffer, " weak"); |
| 1635 | |
| 1636 | if (flags & BSF_SECTION_SYM) |
| 1637 | strcat (buffer, " section-sym"); |
| 1638 | |
| 1639 | if (flags & BSF_OLD_COMMON) |
| 1640 | strcat (buffer, " old-common"); |
| 1641 | |
| 1642 | if (flags & BSF_NOT_AT_END) |
| 1643 | strcat (buffer, " not-at-end"); |
| 1644 | |
| 1645 | if (flags & BSF_CONSTRUCTOR) |
| 1646 | strcat (buffer, " constructor"); |
| 1647 | |
| 1648 | if (flags & BSF_WARNING) |
| 1649 | strcat (buffer, " warning"); |
| 1650 | |
| 1651 | if (flags & BSF_INDIRECT) |
| 1652 | strcat (buffer, " indirect"); |
| 1653 | |
| 1654 | if (flags & BSF_FILE) |
| 1655 | strcat (buffer, " file"); |
| 1656 | |
| 1657 | if (flags & DYNAMIC) |
| 1658 | strcat (buffer, " dynamic"); |
| 1659 | |
| 1660 | if (flags & ~(BSF_LOCAL |
| 1661 | | BSF_GLOBAL |
| 1662 | | BSF_DEBUGGING |
| 1663 | | BSF_FUNCTION |
| 1664 | | BSF_KEEP |
| 1665 | | BSF_KEEP_G |
| 1666 | | BSF_WEAK |
| 1667 | | BSF_SECTION_SYM |
| 1668 | | BSF_OLD_COMMON |
| 1669 | | BSF_NOT_AT_END |
| 1670 | | BSF_CONSTRUCTOR |
| 1671 | | BSF_WARNING |
| 1672 | | BSF_INDIRECT |
| 1673 | | BSF_FILE |
| 1674 | | BSF_DYNAMIC)) |
| 1675 | strcat (buffer, " unknown-bits"); |
| 1676 | |
| 1677 | return buffer; |
| 1678 | } |
| 1679 | #endif |
| 1680 | \f |
| 1681 | #include "elfcore.h" |
| 1682 | #include "elflink.h" |
| 1683 | \f |
| 1684 | /* Size-dependent data and functions. */ |
| 1685 | const struct elf_size_info NAME(_bfd_elf,size_info) = { |
| 1686 | sizeof (Elf_External_Ehdr), |
| 1687 | sizeof (Elf_External_Phdr), |
| 1688 | sizeof (Elf_External_Shdr), |
| 1689 | sizeof (Elf_External_Rel), |
| 1690 | sizeof (Elf_External_Rela), |
| 1691 | sizeof (Elf_External_Sym), |
| 1692 | sizeof (Elf_External_Dyn), |
| 1693 | sizeof (Elf_External_Note), |
| 1694 | 4, |
| 1695 | 1, |
| 1696 | ARCH_SIZE, FILE_ALIGN, |
| 1697 | ELFCLASS, EV_CURRENT, |
| 1698 | elf_write_out_phdrs, |
| 1699 | elf_write_shdrs_and_ehdr, |
| 1700 | elf_write_relocs, |
| 1701 | elf_swap_symbol_in, |
| 1702 | elf_swap_symbol_out, |
| 1703 | elf_slurp_reloc_table, |
| 1704 | elf_slurp_symbol_table, |
| 1705 | elf_swap_dyn_in, |
| 1706 | elf_swap_dyn_out, |
| 1707 | NULL, |
| 1708 | NULL, |
| 1709 | NULL, |
| 1710 | NULL |
| 1711 | }; |