| 1 | /* Intel 80386/80486-specific support for 32-bit ELF |
| 2 | Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001 |
| 3 | Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of BFD, the Binary File Descriptor library. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 20 | |
| 21 | #include "bfd.h" |
| 22 | #include "sysdep.h" |
| 23 | #include "bfdlink.h" |
| 24 | #include "libbfd.h" |
| 25 | #include "elf-bfd.h" |
| 26 | |
| 27 | static reloc_howto_type *elf_i386_reloc_type_lookup |
| 28 | PARAMS ((bfd *, bfd_reloc_code_real_type)); |
| 29 | static void elf_i386_info_to_howto |
| 30 | PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *)); |
| 31 | static void elf_i386_info_to_howto_rel |
| 32 | PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *)); |
| 33 | static boolean elf_i386_is_local_label_name |
| 34 | PARAMS ((bfd *, const char *)); |
| 35 | static boolean elf_i386_grok_prstatus |
| 36 | PARAMS ((bfd *abfd, Elf_Internal_Note *note)); |
| 37 | static boolean elf_i386_grok_psinfo |
| 38 | PARAMS ((bfd *abfd, Elf_Internal_Note *note)); |
| 39 | static struct bfd_hash_entry *link_hash_newfunc |
| 40 | PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); |
| 41 | static struct bfd_link_hash_table *elf_i386_link_hash_table_create |
| 42 | PARAMS ((bfd *)); |
| 43 | static boolean create_got_section |
| 44 | PARAMS((bfd *, struct bfd_link_info *)); |
| 45 | static boolean elf_i386_create_dynamic_sections |
| 46 | PARAMS((bfd *, struct bfd_link_info *)); |
| 47 | static void |
| 48 | elf_i386_copy_indirect_symbol |
| 49 | PARAMS ((struct elf_link_hash_entry *, struct elf_link_hash_entry *)); |
| 50 | static boolean elf_i386_check_relocs |
| 51 | PARAMS ((bfd *, struct bfd_link_info *, asection *, |
| 52 | const Elf_Internal_Rela *)); |
| 53 | static asection *elf_i386_gc_mark_hook |
| 54 | PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *, |
| 55 | struct elf_link_hash_entry *, Elf_Internal_Sym *)); |
| 56 | static boolean elf_i386_gc_sweep_hook |
| 57 | PARAMS ((bfd *, struct bfd_link_info *, asection *, |
| 58 | const Elf_Internal_Rela *)); |
| 59 | static boolean elf_i386_adjust_dynamic_symbol |
| 60 | PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); |
| 61 | static boolean allocate_dynrelocs |
| 62 | PARAMS ((struct elf_link_hash_entry *, PTR)); |
| 63 | static boolean readonly_dynrelocs |
| 64 | PARAMS ((struct elf_link_hash_entry *, PTR)); |
| 65 | static boolean elf_i386_fake_sections |
| 66 | PARAMS ((bfd *, Elf32_Internal_Shdr *, asection *)); |
| 67 | static boolean elf_i386_size_dynamic_sections |
| 68 | PARAMS ((bfd *, struct bfd_link_info *)); |
| 69 | static boolean elf_i386_relocate_section |
| 70 | PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, |
| 71 | Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); |
| 72 | static boolean elf_i386_finish_dynamic_symbol |
| 73 | PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, |
| 74 | Elf_Internal_Sym *)); |
| 75 | static enum elf_reloc_type_class elf_i386_reloc_type_class |
| 76 | PARAMS ((const Elf_Internal_Rela *)); |
| 77 | static boolean elf_i386_finish_dynamic_sections |
| 78 | PARAMS ((bfd *, struct bfd_link_info *)); |
| 79 | |
| 80 | #define USE_REL 1 /* 386 uses REL relocations instead of RELA */ |
| 81 | |
| 82 | #include "elf/i386.h" |
| 83 | |
| 84 | static reloc_howto_type elf_howto_table[]= |
| 85 | { |
| 86 | HOWTO(R_386_NONE, 0, 0, 0, false, 0, complain_overflow_bitfield, |
| 87 | bfd_elf_generic_reloc, "R_386_NONE", |
| 88 | true, 0x00000000, 0x00000000, false), |
| 89 | HOWTO(R_386_32, 0, 2, 32, false, 0, complain_overflow_bitfield, |
| 90 | bfd_elf_generic_reloc, "R_386_32", |
| 91 | true, 0xffffffff, 0xffffffff, false), |
| 92 | HOWTO(R_386_PC32, 0, 2, 32, true, 0, complain_overflow_bitfield, |
| 93 | bfd_elf_generic_reloc, "R_386_PC32", |
| 94 | true, 0xffffffff, 0xffffffff, true), |
| 95 | HOWTO(R_386_GOT32, 0, 2, 32, false, 0, complain_overflow_bitfield, |
| 96 | bfd_elf_generic_reloc, "R_386_GOT32", |
| 97 | true, 0xffffffff, 0xffffffff, false), |
| 98 | HOWTO(R_386_PLT32, 0, 2, 32, true, 0, complain_overflow_bitfield, |
| 99 | bfd_elf_generic_reloc, "R_386_PLT32", |
| 100 | true, 0xffffffff, 0xffffffff, true), |
| 101 | HOWTO(R_386_COPY, 0, 2, 32, false, 0, complain_overflow_bitfield, |
| 102 | bfd_elf_generic_reloc, "R_386_COPY", |
| 103 | true, 0xffffffff, 0xffffffff, false), |
| 104 | HOWTO(R_386_GLOB_DAT, 0, 2, 32, false, 0, complain_overflow_bitfield, |
| 105 | bfd_elf_generic_reloc, "R_386_GLOB_DAT", |
| 106 | true, 0xffffffff, 0xffffffff, false), |
| 107 | HOWTO(R_386_JUMP_SLOT, 0, 2, 32, false, 0, complain_overflow_bitfield, |
| 108 | bfd_elf_generic_reloc, "R_386_JUMP_SLOT", |
| 109 | true, 0xffffffff, 0xffffffff, false), |
| 110 | HOWTO(R_386_RELATIVE, 0, 2, 32, false, 0, complain_overflow_bitfield, |
| 111 | bfd_elf_generic_reloc, "R_386_RELATIVE", |
| 112 | true, 0xffffffff, 0xffffffff, false), |
| 113 | HOWTO(R_386_GOTOFF, 0, 2, 32, false, 0, complain_overflow_bitfield, |
| 114 | bfd_elf_generic_reloc, "R_386_GOTOFF", |
| 115 | true, 0xffffffff, 0xffffffff, false), |
| 116 | HOWTO(R_386_GOTPC, 0, 2, 32, true, 0, complain_overflow_bitfield, |
| 117 | bfd_elf_generic_reloc, "R_386_GOTPC", |
| 118 | true, 0xffffffff, 0xffffffff, true), |
| 119 | |
| 120 | /* We have a gap in the reloc numbers here. |
| 121 | R_386_standard counts the number up to this point, and |
| 122 | R_386_ext_offset is the value to subtract from a reloc type of |
| 123 | R_386_16 thru R_386_PC8 to form an index into this table. */ |
| 124 | #define R_386_standard ((unsigned int) R_386_GOTPC + 1) |
| 125 | #define R_386_ext_offset ((unsigned int) R_386_16 - R_386_standard) |
| 126 | |
| 127 | /* The remaining relocs are a GNU extension. */ |
| 128 | HOWTO(R_386_16, 0, 1, 16, false, 0, complain_overflow_bitfield, |
| 129 | bfd_elf_generic_reloc, "R_386_16", |
| 130 | true, 0xffff, 0xffff, false), |
| 131 | HOWTO(R_386_PC16, 0, 1, 16, true, 0, complain_overflow_bitfield, |
| 132 | bfd_elf_generic_reloc, "R_386_PC16", |
| 133 | true, 0xffff, 0xffff, true), |
| 134 | HOWTO(R_386_8, 0, 0, 8, false, 0, complain_overflow_bitfield, |
| 135 | bfd_elf_generic_reloc, "R_386_8", |
| 136 | true, 0xff, 0xff, false), |
| 137 | HOWTO(R_386_PC8, 0, 0, 8, true, 0, complain_overflow_signed, |
| 138 | bfd_elf_generic_reloc, "R_386_PC8", |
| 139 | true, 0xff, 0xff, true), |
| 140 | |
| 141 | /* Another gap. */ |
| 142 | #define R_386_ext ((unsigned int) R_386_PC8 + 1 - R_386_ext_offset) |
| 143 | #define R_386_vt_offset ((unsigned int) R_386_GNU_VTINHERIT - R_386_ext) |
| 144 | |
| 145 | /* GNU extension to record C++ vtable hierarchy. */ |
| 146 | HOWTO (R_386_GNU_VTINHERIT, /* type */ |
| 147 | 0, /* rightshift */ |
| 148 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 149 | 0, /* bitsize */ |
| 150 | false, /* pc_relative */ |
| 151 | 0, /* bitpos */ |
| 152 | complain_overflow_dont, /* complain_on_overflow */ |
| 153 | NULL, /* special_function */ |
| 154 | "R_386_GNU_VTINHERIT", /* name */ |
| 155 | false, /* partial_inplace */ |
| 156 | 0, /* src_mask */ |
| 157 | 0, /* dst_mask */ |
| 158 | false), |
| 159 | |
| 160 | /* GNU extension to record C++ vtable member usage. */ |
| 161 | HOWTO (R_386_GNU_VTENTRY, /* type */ |
| 162 | 0, /* rightshift */ |
| 163 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 164 | 0, /* bitsize */ |
| 165 | false, /* pc_relative */ |
| 166 | 0, /* bitpos */ |
| 167 | complain_overflow_dont, /* complain_on_overflow */ |
| 168 | _bfd_elf_rel_vtable_reloc_fn, /* special_function */ |
| 169 | "R_386_GNU_VTENTRY", /* name */ |
| 170 | false, /* partial_inplace */ |
| 171 | 0, /* src_mask */ |
| 172 | 0, /* dst_mask */ |
| 173 | false) |
| 174 | |
| 175 | #define R_386_vt ((unsigned int) R_386_GNU_VTENTRY + 1 - R_386_vt_offset) |
| 176 | |
| 177 | }; |
| 178 | |
| 179 | #ifdef DEBUG_GEN_RELOC |
| 180 | #define TRACE(str) fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str) |
| 181 | #else |
| 182 | #define TRACE(str) |
| 183 | #endif |
| 184 | |
| 185 | static reloc_howto_type * |
| 186 | elf_i386_reloc_type_lookup (abfd, code) |
| 187 | bfd *abfd ATTRIBUTE_UNUSED; |
| 188 | bfd_reloc_code_real_type code; |
| 189 | { |
| 190 | switch (code) |
| 191 | { |
| 192 | case BFD_RELOC_NONE: |
| 193 | TRACE ("BFD_RELOC_NONE"); |
| 194 | return &elf_howto_table[(unsigned int) R_386_NONE ]; |
| 195 | |
| 196 | case BFD_RELOC_32: |
| 197 | TRACE ("BFD_RELOC_32"); |
| 198 | return &elf_howto_table[(unsigned int) R_386_32 ]; |
| 199 | |
| 200 | case BFD_RELOC_CTOR: |
| 201 | TRACE ("BFD_RELOC_CTOR"); |
| 202 | return &elf_howto_table[(unsigned int) R_386_32 ]; |
| 203 | |
| 204 | case BFD_RELOC_32_PCREL: |
| 205 | TRACE ("BFD_RELOC_PC32"); |
| 206 | return &elf_howto_table[(unsigned int) R_386_PC32 ]; |
| 207 | |
| 208 | case BFD_RELOC_386_GOT32: |
| 209 | TRACE ("BFD_RELOC_386_GOT32"); |
| 210 | return &elf_howto_table[(unsigned int) R_386_GOT32 ]; |
| 211 | |
| 212 | case BFD_RELOC_386_PLT32: |
| 213 | TRACE ("BFD_RELOC_386_PLT32"); |
| 214 | return &elf_howto_table[(unsigned int) R_386_PLT32 ]; |
| 215 | |
| 216 | case BFD_RELOC_386_COPY: |
| 217 | TRACE ("BFD_RELOC_386_COPY"); |
| 218 | return &elf_howto_table[(unsigned int) R_386_COPY ]; |
| 219 | |
| 220 | case BFD_RELOC_386_GLOB_DAT: |
| 221 | TRACE ("BFD_RELOC_386_GLOB_DAT"); |
| 222 | return &elf_howto_table[(unsigned int) R_386_GLOB_DAT ]; |
| 223 | |
| 224 | case BFD_RELOC_386_JUMP_SLOT: |
| 225 | TRACE ("BFD_RELOC_386_JUMP_SLOT"); |
| 226 | return &elf_howto_table[(unsigned int) R_386_JUMP_SLOT ]; |
| 227 | |
| 228 | case BFD_RELOC_386_RELATIVE: |
| 229 | TRACE ("BFD_RELOC_386_RELATIVE"); |
| 230 | return &elf_howto_table[(unsigned int) R_386_RELATIVE ]; |
| 231 | |
| 232 | case BFD_RELOC_386_GOTOFF: |
| 233 | TRACE ("BFD_RELOC_386_GOTOFF"); |
| 234 | return &elf_howto_table[(unsigned int) R_386_GOTOFF ]; |
| 235 | |
| 236 | case BFD_RELOC_386_GOTPC: |
| 237 | TRACE ("BFD_RELOC_386_GOTPC"); |
| 238 | return &elf_howto_table[(unsigned int) R_386_GOTPC ]; |
| 239 | |
| 240 | /* The remaining relocs are a GNU extension. */ |
| 241 | case BFD_RELOC_16: |
| 242 | TRACE ("BFD_RELOC_16"); |
| 243 | return &elf_howto_table[(unsigned int) R_386_16 - R_386_ext_offset]; |
| 244 | |
| 245 | case BFD_RELOC_16_PCREL: |
| 246 | TRACE ("BFD_RELOC_16_PCREL"); |
| 247 | return &elf_howto_table[(unsigned int) R_386_PC16 - R_386_ext_offset]; |
| 248 | |
| 249 | case BFD_RELOC_8: |
| 250 | TRACE ("BFD_RELOC_8"); |
| 251 | return &elf_howto_table[(unsigned int) R_386_8 - R_386_ext_offset]; |
| 252 | |
| 253 | case BFD_RELOC_8_PCREL: |
| 254 | TRACE ("BFD_RELOC_8_PCREL"); |
| 255 | return &elf_howto_table[(unsigned int) R_386_PC8 - R_386_ext_offset]; |
| 256 | |
| 257 | case BFD_RELOC_VTABLE_INHERIT: |
| 258 | TRACE ("BFD_RELOC_VTABLE_INHERIT"); |
| 259 | return &elf_howto_table[(unsigned int) R_386_GNU_VTINHERIT |
| 260 | - R_386_vt_offset]; |
| 261 | |
| 262 | case BFD_RELOC_VTABLE_ENTRY: |
| 263 | TRACE ("BFD_RELOC_VTABLE_ENTRY"); |
| 264 | return &elf_howto_table[(unsigned int) R_386_GNU_VTENTRY |
| 265 | - R_386_vt_offset]; |
| 266 | |
| 267 | default: |
| 268 | break; |
| 269 | } |
| 270 | |
| 271 | TRACE ("Unknown"); |
| 272 | return 0; |
| 273 | } |
| 274 | |
| 275 | static void |
| 276 | elf_i386_info_to_howto (abfd, cache_ptr, dst) |
| 277 | bfd *abfd ATTRIBUTE_UNUSED; |
| 278 | arelent *cache_ptr ATTRIBUTE_UNUSED; |
| 279 | Elf32_Internal_Rela *dst ATTRIBUTE_UNUSED; |
| 280 | { |
| 281 | abort (); |
| 282 | } |
| 283 | |
| 284 | static void |
| 285 | elf_i386_info_to_howto_rel (abfd, cache_ptr, dst) |
| 286 | bfd *abfd ATTRIBUTE_UNUSED; |
| 287 | arelent *cache_ptr; |
| 288 | Elf32_Internal_Rel *dst; |
| 289 | { |
| 290 | unsigned int r_type = ELF32_R_TYPE (dst->r_info); |
| 291 | unsigned int indx; |
| 292 | |
| 293 | if ((indx = r_type) >= R_386_standard |
| 294 | && ((indx = r_type - R_386_ext_offset) - R_386_standard |
| 295 | >= R_386_ext - R_386_standard) |
| 296 | && ((indx = r_type - R_386_vt_offset) - R_386_ext |
| 297 | >= R_386_vt - R_386_ext)) |
| 298 | { |
| 299 | (*_bfd_error_handler) (_("%s: invalid relocation type %d"), |
| 300 | bfd_archive_filename (abfd), (int) r_type); |
| 301 | indx = (unsigned int) R_386_NONE; |
| 302 | } |
| 303 | cache_ptr->howto = &elf_howto_table[indx]; |
| 304 | } |
| 305 | |
| 306 | /* Return whether a symbol name implies a local label. The UnixWare |
| 307 | 2.1 cc generates temporary symbols that start with .X, so we |
| 308 | recognize them here. FIXME: do other SVR4 compilers also use .X?. |
| 309 | If so, we should move the .X recognition into |
| 310 | _bfd_elf_is_local_label_name. */ |
| 311 | |
| 312 | static boolean |
| 313 | elf_i386_is_local_label_name (abfd, name) |
| 314 | bfd *abfd; |
| 315 | const char *name; |
| 316 | { |
| 317 | if (name[0] == '.' && name[1] == 'X') |
| 318 | return true; |
| 319 | |
| 320 | return _bfd_elf_is_local_label_name (abfd, name); |
| 321 | } |
| 322 | \f |
| 323 | /* Support for core dump NOTE sections. */ |
| 324 | static boolean |
| 325 | elf_i386_grok_prstatus (abfd, note) |
| 326 | bfd *abfd; |
| 327 | Elf_Internal_Note *note; |
| 328 | { |
| 329 | int offset; |
| 330 | size_t raw_size; |
| 331 | |
| 332 | switch (note->descsz) |
| 333 | { |
| 334 | default: |
| 335 | return false; |
| 336 | |
| 337 | case 144: /* Linux/i386 */ |
| 338 | /* pr_cursig */ |
| 339 | elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12); |
| 340 | |
| 341 | /* pr_pid */ |
| 342 | elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24); |
| 343 | |
| 344 | /* pr_reg */ |
| 345 | offset = 72; |
| 346 | raw_size = 68; |
| 347 | |
| 348 | break; |
| 349 | } |
| 350 | |
| 351 | /* Make a ".reg/999" section. */ |
| 352 | return _bfd_elfcore_make_pseudosection (abfd, ".reg", |
| 353 | raw_size, note->descpos + offset); |
| 354 | } |
| 355 | |
| 356 | static boolean |
| 357 | elf_i386_grok_psinfo (abfd, note) |
| 358 | bfd *abfd; |
| 359 | Elf_Internal_Note *note; |
| 360 | { |
| 361 | switch (note->descsz) |
| 362 | { |
| 363 | default: |
| 364 | return false; |
| 365 | |
| 366 | case 128: /* Linux/MIPS elf_prpsinfo */ |
| 367 | elf_tdata (abfd)->core_program |
| 368 | = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); |
| 369 | elf_tdata (abfd)->core_command |
| 370 | = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); |
| 371 | } |
| 372 | |
| 373 | /* Note that for some reason, a spurious space is tacked |
| 374 | onto the end of the args in some (at least one anyway) |
| 375 | implementations, so strip it off if it exists. */ |
| 376 | |
| 377 | { |
| 378 | char *command = elf_tdata (abfd)->core_command; |
| 379 | int n = strlen (command); |
| 380 | |
| 381 | if (0 < n && command[n - 1] == ' ') |
| 382 | command[n - 1] = '\0'; |
| 383 | } |
| 384 | |
| 385 | return true; |
| 386 | } |
| 387 | \f |
| 388 | /* Functions for the i386 ELF linker. |
| 389 | |
| 390 | In order to gain some understanding of code in this file without |
| 391 | knowing all the intricate details of the linker, note the |
| 392 | following: |
| 393 | |
| 394 | Functions named elf_i386_* are called by external routines, other |
| 395 | functions are only called locally. elf_i386_* functions appear |
| 396 | in this file more or less in the order in which they are called |
| 397 | from external routines. eg. elf_i386_check_relocs is called |
| 398 | early in the link process, elf_i386_finish_dynamic_sections is |
| 399 | one of the last functions. */ |
| 400 | |
| 401 | |
| 402 | /* The name of the dynamic interpreter. This is put in the .interp |
| 403 | section. */ |
| 404 | |
| 405 | #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" |
| 406 | |
| 407 | /* The size in bytes of an entry in the procedure linkage table. */ |
| 408 | |
| 409 | #define PLT_ENTRY_SIZE 16 |
| 410 | |
| 411 | /* The first entry in an absolute procedure linkage table looks like |
| 412 | this. See the SVR4 ABI i386 supplement to see how this works. */ |
| 413 | |
| 414 | static const bfd_byte elf_i386_plt0_entry[PLT_ENTRY_SIZE] = |
| 415 | { |
| 416 | 0xff, 0x35, /* pushl contents of address */ |
| 417 | 0, 0, 0, 0, /* replaced with address of .got + 4. */ |
| 418 | 0xff, 0x25, /* jmp indirect */ |
| 419 | 0, 0, 0, 0, /* replaced with address of .got + 8. */ |
| 420 | 0, 0, 0, 0 /* pad out to 16 bytes. */ |
| 421 | }; |
| 422 | |
| 423 | /* Subsequent entries in an absolute procedure linkage table look like |
| 424 | this. */ |
| 425 | |
| 426 | static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] = |
| 427 | { |
| 428 | 0xff, 0x25, /* jmp indirect */ |
| 429 | 0, 0, 0, 0, /* replaced with address of this symbol in .got. */ |
| 430 | 0x68, /* pushl immediate */ |
| 431 | 0, 0, 0, 0, /* replaced with offset into relocation table. */ |
| 432 | 0xe9, /* jmp relative */ |
| 433 | 0, 0, 0, 0 /* replaced with offset to start of .plt. */ |
| 434 | }; |
| 435 | |
| 436 | /* The first entry in a PIC procedure linkage table look like this. */ |
| 437 | |
| 438 | static const bfd_byte elf_i386_pic_plt0_entry[PLT_ENTRY_SIZE] = |
| 439 | { |
| 440 | 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */ |
| 441 | 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */ |
| 442 | 0, 0, 0, 0 /* pad out to 16 bytes. */ |
| 443 | }; |
| 444 | |
| 445 | /* Subsequent entries in a PIC procedure linkage table look like this. */ |
| 446 | |
| 447 | static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] = |
| 448 | { |
| 449 | 0xff, 0xa3, /* jmp *offset(%ebx) */ |
| 450 | 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ |
| 451 | 0x68, /* pushl immediate */ |
| 452 | 0, 0, 0, 0, /* replaced with offset into relocation table. */ |
| 453 | 0xe9, /* jmp relative */ |
| 454 | 0, 0, 0, 0 /* replaced with offset to start of .plt. */ |
| 455 | }; |
| 456 | |
| 457 | /* The i386 linker needs to keep track of the number of relocs that it |
| 458 | decides to copy as dynamic relocs in check_relocs for each symbol. |
| 459 | This is so that it can later discard them if they are found to be |
| 460 | unnecessary. We store the information in a field extending the |
| 461 | regular ELF linker hash table. */ |
| 462 | |
| 463 | struct elf_i386_dyn_relocs |
| 464 | { |
| 465 | struct elf_i386_dyn_relocs *next; |
| 466 | |
| 467 | /* The input section of the reloc. */ |
| 468 | asection *sec; |
| 469 | |
| 470 | /* Total number of relocs copied for the input section. */ |
| 471 | bfd_size_type count; |
| 472 | |
| 473 | /* Number of pc-relative relocs copied for the input section. */ |
| 474 | bfd_size_type pc_count; |
| 475 | }; |
| 476 | |
| 477 | /* i386 ELF linker hash entry. */ |
| 478 | |
| 479 | struct elf_i386_link_hash_entry |
| 480 | { |
| 481 | struct elf_link_hash_entry elf; |
| 482 | |
| 483 | /* Track dynamic relocs copied for this symbol. */ |
| 484 | struct elf_i386_dyn_relocs *dyn_relocs; |
| 485 | }; |
| 486 | |
| 487 | /* i386 ELF linker hash table. */ |
| 488 | |
| 489 | struct elf_i386_link_hash_table |
| 490 | { |
| 491 | struct elf_link_hash_table elf; |
| 492 | |
| 493 | /* Short-cuts to get to dynamic linker sections. */ |
| 494 | asection *sgot; |
| 495 | asection *sgotplt; |
| 496 | asection *srelgot; |
| 497 | asection *splt; |
| 498 | asection *srelplt; |
| 499 | asection *sdynbss; |
| 500 | asection *srelbss; |
| 501 | }; |
| 502 | |
| 503 | /* Get the i386 ELF linker hash table from a link_info structure. */ |
| 504 | |
| 505 | #define elf_i386_hash_table(p) \ |
| 506 | ((struct elf_i386_link_hash_table *) ((p)->hash)) |
| 507 | |
| 508 | /* Create an entry in an i386 ELF linker hash table. */ |
| 509 | |
| 510 | static struct bfd_hash_entry * |
| 511 | link_hash_newfunc (entry, table, string) |
| 512 | struct bfd_hash_entry *entry; |
| 513 | struct bfd_hash_table *table; |
| 514 | const char *string; |
| 515 | { |
| 516 | /* Allocate the structure if it has not already been allocated by a |
| 517 | subclass. */ |
| 518 | if (entry == NULL) |
| 519 | { |
| 520 | entry = bfd_hash_allocate (table, |
| 521 | sizeof (struct elf_i386_link_hash_entry)); |
| 522 | if (entry == NULL) |
| 523 | return entry; |
| 524 | } |
| 525 | |
| 526 | /* Call the allocation method of the superclass. */ |
| 527 | entry = _bfd_elf_link_hash_newfunc (entry, table, string); |
| 528 | if (entry != NULL) |
| 529 | { |
| 530 | struct elf_i386_link_hash_entry *eh; |
| 531 | |
| 532 | eh = (struct elf_i386_link_hash_entry *) entry; |
| 533 | eh->dyn_relocs = NULL; |
| 534 | } |
| 535 | |
| 536 | return entry; |
| 537 | } |
| 538 | |
| 539 | /* Create an i386 ELF linker hash table. */ |
| 540 | |
| 541 | static struct bfd_link_hash_table * |
| 542 | elf_i386_link_hash_table_create (abfd) |
| 543 | bfd *abfd; |
| 544 | { |
| 545 | struct elf_i386_link_hash_table *ret; |
| 546 | bfd_size_type amt = sizeof (struct elf_i386_link_hash_table); |
| 547 | |
| 548 | ret = (struct elf_i386_link_hash_table *) bfd_alloc (abfd, amt); |
| 549 | if (ret == NULL) |
| 550 | return NULL; |
| 551 | |
| 552 | if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc)) |
| 553 | { |
| 554 | bfd_release (abfd, ret); |
| 555 | return NULL; |
| 556 | } |
| 557 | |
| 558 | ret->sgot = NULL; |
| 559 | ret->sgotplt = NULL; |
| 560 | ret->srelgot = NULL; |
| 561 | ret->splt = NULL; |
| 562 | ret->srelplt = NULL; |
| 563 | ret->sdynbss = NULL; |
| 564 | ret->srelbss = NULL; |
| 565 | |
| 566 | return &ret->elf.root; |
| 567 | } |
| 568 | |
| 569 | /* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up |
| 570 | shortcuts to them in our hash table. */ |
| 571 | |
| 572 | static boolean |
| 573 | create_got_section (dynobj, info) |
| 574 | bfd *dynobj; |
| 575 | struct bfd_link_info *info; |
| 576 | { |
| 577 | struct elf_i386_link_hash_table *htab; |
| 578 | |
| 579 | if (! _bfd_elf_create_got_section (dynobj, info)) |
| 580 | return false; |
| 581 | |
| 582 | htab = elf_i386_hash_table (info); |
| 583 | htab->sgot = bfd_get_section_by_name (dynobj, ".got"); |
| 584 | htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); |
| 585 | if (!htab->sgot || !htab->sgotplt) |
| 586 | abort (); |
| 587 | |
| 588 | htab->srelgot = bfd_make_section (dynobj, ".rel.got"); |
| 589 | if (htab->srelgot == NULL |
| 590 | || ! bfd_set_section_flags (dynobj, htab->srelgot, |
| 591 | (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS |
| 592 | | SEC_IN_MEMORY | SEC_LINKER_CREATED |
| 593 | | SEC_READONLY)) |
| 594 | || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2)) |
| 595 | return false; |
| 596 | return true; |
| 597 | } |
| 598 | |
| 599 | /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and |
| 600 | .rel.bss sections in DYNOBJ, and set up shortcuts to them in our |
| 601 | hash table. */ |
| 602 | |
| 603 | static boolean |
| 604 | elf_i386_create_dynamic_sections (dynobj, info) |
| 605 | bfd *dynobj; |
| 606 | struct bfd_link_info *info; |
| 607 | { |
| 608 | struct elf_i386_link_hash_table *htab; |
| 609 | |
| 610 | htab = elf_i386_hash_table (info); |
| 611 | if (!htab->sgot && !create_got_section (dynobj, info)) |
| 612 | return false; |
| 613 | |
| 614 | if (!_bfd_elf_create_dynamic_sections (dynobj, info)) |
| 615 | return false; |
| 616 | |
| 617 | htab->splt = bfd_get_section_by_name (dynobj, ".plt"); |
| 618 | htab->srelplt = bfd_get_section_by_name (dynobj, ".rel.plt"); |
| 619 | htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss"); |
| 620 | if (!info->shared) |
| 621 | htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss"); |
| 622 | |
| 623 | if (!htab->splt || !htab->srelplt || !htab->sdynbss |
| 624 | || (!info->shared && !htab->srelbss)) |
| 625 | abort (); |
| 626 | |
| 627 | return true; |
| 628 | } |
| 629 | |
| 630 | /* Copy the extra info we tack onto an elf_link_hash_entry. */ |
| 631 | |
| 632 | void |
| 633 | elf_i386_copy_indirect_symbol (dir, ind) |
| 634 | struct elf_link_hash_entry *dir, *ind; |
| 635 | { |
| 636 | struct elf_i386_link_hash_entry *edir, *eind; |
| 637 | |
| 638 | edir = (struct elf_i386_link_hash_entry *) dir; |
| 639 | eind = (struct elf_i386_link_hash_entry *) ind; |
| 640 | |
| 641 | if (edir->dyn_relocs == NULL) |
| 642 | { |
| 643 | edir->dyn_relocs = eind->dyn_relocs; |
| 644 | eind->dyn_relocs = NULL; |
| 645 | } |
| 646 | else if (eind->dyn_relocs != NULL) |
| 647 | abort (); |
| 648 | |
| 649 | _bfd_elf_link_hash_copy_indirect (dir, ind); |
| 650 | } |
| 651 | |
| 652 | /* Look through the relocs for a section during the first phase, and |
| 653 | allocate space in the global offset table or procedure linkage |
| 654 | table. */ |
| 655 | |
| 656 | static boolean |
| 657 | elf_i386_check_relocs (abfd, info, sec, relocs) |
| 658 | bfd *abfd; |
| 659 | struct bfd_link_info *info; |
| 660 | asection *sec; |
| 661 | const Elf_Internal_Rela *relocs; |
| 662 | { |
| 663 | struct elf_i386_link_hash_table *htab; |
| 664 | bfd *dynobj; |
| 665 | Elf_Internal_Shdr *symtab_hdr; |
| 666 | struct elf_link_hash_entry **sym_hashes; |
| 667 | bfd_signed_vma *local_got_refcounts; |
| 668 | const Elf_Internal_Rela *rel; |
| 669 | const Elf_Internal_Rela *rel_end; |
| 670 | asection *sreloc; |
| 671 | |
| 672 | if (info->relocateable) |
| 673 | return true; |
| 674 | |
| 675 | htab = elf_i386_hash_table (info); |
| 676 | dynobj = htab->elf.dynobj; |
| 677 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 678 | sym_hashes = elf_sym_hashes (abfd); |
| 679 | local_got_refcounts = elf_local_got_refcounts (abfd); |
| 680 | |
| 681 | sreloc = NULL; |
| 682 | |
| 683 | rel_end = relocs + sec->reloc_count; |
| 684 | for (rel = relocs; rel < rel_end; rel++) |
| 685 | { |
| 686 | unsigned long r_symndx; |
| 687 | struct elf_link_hash_entry *h; |
| 688 | |
| 689 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 690 | |
| 691 | if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) |
| 692 | { |
| 693 | (*_bfd_error_handler) (_("%s: bad symbol index: %d"), |
| 694 | bfd_archive_filename (abfd), |
| 695 | r_symndx); |
| 696 | return false; |
| 697 | } |
| 698 | |
| 699 | if (r_symndx < symtab_hdr->sh_info) |
| 700 | h = NULL; |
| 701 | else |
| 702 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 703 | |
| 704 | /* Some relocs require a global offset table. */ |
| 705 | if (htab->sgot == NULL) |
| 706 | { |
| 707 | switch (ELF32_R_TYPE (rel->r_info)) |
| 708 | { |
| 709 | case R_386_GOT32: |
| 710 | case R_386_GOTOFF: |
| 711 | case R_386_GOTPC: |
| 712 | if (dynobj == NULL) |
| 713 | htab->elf.dynobj = dynobj = abfd; |
| 714 | if (!create_got_section (dynobj, info)) |
| 715 | return false; |
| 716 | break; |
| 717 | |
| 718 | default: |
| 719 | break; |
| 720 | } |
| 721 | } |
| 722 | |
| 723 | switch (ELF32_R_TYPE (rel->r_info)) |
| 724 | { |
| 725 | case R_386_GOT32: |
| 726 | /* This symbol requires a global offset table entry. */ |
| 727 | if (h != NULL) |
| 728 | { |
| 729 | if (h->got.refcount == -1) |
| 730 | h->got.refcount = 1; |
| 731 | else |
| 732 | h->got.refcount += 1; |
| 733 | } |
| 734 | else |
| 735 | { |
| 736 | /* This is a global offset table entry for a local symbol. */ |
| 737 | if (local_got_refcounts == NULL) |
| 738 | { |
| 739 | bfd_size_type size; |
| 740 | |
| 741 | size = symtab_hdr->sh_info; |
| 742 | size *= sizeof (bfd_signed_vma); |
| 743 | local_got_refcounts = ((bfd_signed_vma *) |
| 744 | bfd_zalloc (abfd, size)); |
| 745 | if (local_got_refcounts == NULL) |
| 746 | return false; |
| 747 | elf_local_got_refcounts (abfd) = local_got_refcounts; |
| 748 | } |
| 749 | local_got_refcounts[r_symndx] += 1; |
| 750 | } |
| 751 | break; |
| 752 | |
| 753 | case R_386_PLT32: |
| 754 | /* This symbol requires a procedure linkage table entry. We |
| 755 | actually build the entry in adjust_dynamic_symbol, |
| 756 | because this might be a case of linking PIC code which is |
| 757 | never referenced by a dynamic object, in which case we |
| 758 | don't need to generate a procedure linkage table entry |
| 759 | after all. */ |
| 760 | |
| 761 | /* If this is a local symbol, we resolve it directly without |
| 762 | creating a procedure linkage table entry. */ |
| 763 | if (h == NULL) |
| 764 | continue; |
| 765 | |
| 766 | if (h->plt.refcount == -1) |
| 767 | { |
| 768 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; |
| 769 | h->plt.refcount = 1; |
| 770 | } |
| 771 | else |
| 772 | h->plt.refcount += 1; |
| 773 | break; |
| 774 | |
| 775 | case R_386_32: |
| 776 | case R_386_PC32: |
| 777 | if (h != NULL && !info->shared) |
| 778 | { |
| 779 | /* If this reloc is in a read-only section, we might |
| 780 | need a copy reloc. We can't check reliably at this |
| 781 | stage whether the section is read-only, as input |
| 782 | sections have not yet been mapped to output sections. |
| 783 | Tentatively set the flag for now, and correct in |
| 784 | adjust_dynamic_symbol. */ |
| 785 | h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF; |
| 786 | |
| 787 | /* We may need a .plt entry if the function this reloc |
| 788 | refers to is in a shared lib. */ |
| 789 | if (h->plt.refcount == -1) |
| 790 | h->plt.refcount = 1; |
| 791 | else |
| 792 | h->plt.refcount += 1; |
| 793 | } |
| 794 | |
| 795 | /* If we are creating a shared library, and this is a reloc |
| 796 | against a global symbol, or a non PC relative reloc |
| 797 | against a local symbol, then we need to copy the reloc |
| 798 | into the shared library. However, if we are linking with |
| 799 | -Bsymbolic, we do not need to copy a reloc against a |
| 800 | global symbol which is defined in an object we are |
| 801 | including in the link (i.e., DEF_REGULAR is set). At |
| 802 | this point we have not seen all the input files, so it is |
| 803 | possible that DEF_REGULAR is not set now but will be set |
| 804 | later (it is never cleared). In case of a weak definition, |
| 805 | DEF_REGULAR may be cleared later by a strong definition in |
| 806 | a shared library. We account for that possibility below by |
| 807 | storing information in the relocs_copied field of the hash |
| 808 | table entry. A similar situation occurs when creating |
| 809 | shared libraries and symbol visibility changes render the |
| 810 | symbol local. |
| 811 | |
| 812 | If on the other hand, we are creating an executable, we |
| 813 | may need to keep relocations for symbols satisfied by a |
| 814 | dynamic library if we manage to avoid copy relocs for the |
| 815 | symbol. */ |
| 816 | if ((info->shared |
| 817 | && (sec->flags & SEC_ALLOC) != 0 |
| 818 | && (ELF32_R_TYPE (rel->r_info) != R_386_PC32 |
| 819 | || (h != NULL |
| 820 | && (! info->symbolic |
| 821 | || h->root.type == bfd_link_hash_defweak |
| 822 | || (h->elf_link_hash_flags |
| 823 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) |
| 824 | || (!info->shared |
| 825 | && (sec->flags & SEC_ALLOC) != 0 |
| 826 | && h != NULL |
| 827 | && (h->root.type == bfd_link_hash_defweak |
| 828 | || (h->elf_link_hash_flags |
| 829 | & ELF_LINK_HASH_DEF_REGULAR) == 0))) |
| 830 | { |
| 831 | /* We must copy these reloc types into the output file. |
| 832 | Create a reloc section in dynobj and make room for |
| 833 | this reloc. */ |
| 834 | if (dynobj == NULL) |
| 835 | htab->elf.dynobj = dynobj = abfd; |
| 836 | |
| 837 | if (sreloc == NULL) |
| 838 | { |
| 839 | const char *name; |
| 840 | |
| 841 | name = (bfd_elf_string_from_elf_section |
| 842 | (abfd, |
| 843 | elf_elfheader (abfd)->e_shstrndx, |
| 844 | elf_section_data (sec)->rel_hdr.sh_name)); |
| 845 | if (name == NULL) |
| 846 | return false; |
| 847 | |
| 848 | if (strncmp (name, ".rel", 4) != 0 |
| 849 | || strcmp (bfd_get_section_name (abfd, sec), |
| 850 | name + 4) != 0) |
| 851 | { |
| 852 | (*_bfd_error_handler) |
| 853 | (_("%s: bad relocation section name `%s\'"), |
| 854 | bfd_archive_filename (abfd), name); |
| 855 | } |
| 856 | |
| 857 | sreloc = bfd_get_section_by_name (dynobj, name); |
| 858 | if (sreloc == NULL) |
| 859 | { |
| 860 | flagword flags; |
| 861 | |
| 862 | sreloc = bfd_make_section (dynobj, name); |
| 863 | flags = (SEC_HAS_CONTENTS | SEC_READONLY |
| 864 | | SEC_IN_MEMORY | SEC_LINKER_CREATED); |
| 865 | if ((sec->flags & SEC_ALLOC) != 0) |
| 866 | flags |= SEC_ALLOC | SEC_LOAD; |
| 867 | if (sreloc == NULL |
| 868 | || ! bfd_set_section_flags (dynobj, sreloc, flags) |
| 869 | || ! bfd_set_section_alignment (dynobj, sreloc, 2)) |
| 870 | return false; |
| 871 | } |
| 872 | elf_section_data (sec)->sreloc = sreloc; |
| 873 | } |
| 874 | |
| 875 | /* If this is a global symbol, we count the number of |
| 876 | relocations we need for this symbol. */ |
| 877 | if (h != NULL) |
| 878 | { |
| 879 | struct elf_i386_link_hash_entry *eh; |
| 880 | struct elf_i386_dyn_relocs *p; |
| 881 | |
| 882 | eh = (struct elf_i386_link_hash_entry *) h; |
| 883 | p = eh->dyn_relocs; |
| 884 | |
| 885 | if (p == NULL || p->sec != sec) |
| 886 | { |
| 887 | p = ((struct elf_i386_dyn_relocs *) |
| 888 | bfd_alloc (dynobj, (bfd_size_type) sizeof *p)); |
| 889 | if (p == NULL) |
| 890 | return false; |
| 891 | p->next = eh->dyn_relocs; |
| 892 | eh->dyn_relocs = p; |
| 893 | p->sec = sec; |
| 894 | p->count = 0; |
| 895 | p->pc_count = 0; |
| 896 | } |
| 897 | |
| 898 | p->count += 1; |
| 899 | if (ELF32_R_TYPE (rel->r_info) == R_386_PC32) |
| 900 | p->pc_count += 1; |
| 901 | } |
| 902 | else |
| 903 | { |
| 904 | /* Track dynamic relocs needed for local syms too. */ |
| 905 | elf_section_data (sec)->local_dynrel += 1; |
| 906 | } |
| 907 | } |
| 908 | |
| 909 | break; |
| 910 | |
| 911 | /* This relocation describes the C++ object vtable hierarchy. |
| 912 | Reconstruct it for later use during GC. */ |
| 913 | case R_386_GNU_VTINHERIT: |
| 914 | if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) |
| 915 | return false; |
| 916 | break; |
| 917 | |
| 918 | /* This relocation describes which C++ vtable entries are actually |
| 919 | used. Record for later use during GC. */ |
| 920 | case R_386_GNU_VTENTRY: |
| 921 | if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_offset)) |
| 922 | return false; |
| 923 | break; |
| 924 | |
| 925 | default: |
| 926 | break; |
| 927 | } |
| 928 | } |
| 929 | |
| 930 | return true; |
| 931 | } |
| 932 | |
| 933 | /* Return the section that should be marked against GC for a given |
| 934 | relocation. */ |
| 935 | |
| 936 | static asection * |
| 937 | elf_i386_gc_mark_hook (abfd, info, rel, h, sym) |
| 938 | bfd *abfd; |
| 939 | struct bfd_link_info *info ATTRIBUTE_UNUSED; |
| 940 | Elf_Internal_Rela *rel; |
| 941 | struct elf_link_hash_entry *h; |
| 942 | Elf_Internal_Sym *sym; |
| 943 | { |
| 944 | if (h != NULL) |
| 945 | { |
| 946 | switch (ELF32_R_TYPE (rel->r_info)) |
| 947 | { |
| 948 | case R_386_GNU_VTINHERIT: |
| 949 | case R_386_GNU_VTENTRY: |
| 950 | break; |
| 951 | |
| 952 | default: |
| 953 | switch (h->root.type) |
| 954 | { |
| 955 | case bfd_link_hash_defined: |
| 956 | case bfd_link_hash_defweak: |
| 957 | return h->root.u.def.section; |
| 958 | |
| 959 | case bfd_link_hash_common: |
| 960 | return h->root.u.c.p->section; |
| 961 | |
| 962 | default: |
| 963 | break; |
| 964 | } |
| 965 | } |
| 966 | } |
| 967 | else |
| 968 | { |
| 969 | if (!(elf_bad_symtab (abfd) |
| 970 | && ELF_ST_BIND (sym->st_info) != STB_LOCAL) |
| 971 | && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE) |
| 972 | && sym->st_shndx != SHN_COMMON)) |
| 973 | { |
| 974 | return bfd_section_from_elf_index (abfd, sym->st_shndx); |
| 975 | } |
| 976 | } |
| 977 | |
| 978 | return NULL; |
| 979 | } |
| 980 | |
| 981 | /* Update the got entry reference counts for the section being removed. */ |
| 982 | |
| 983 | static boolean |
| 984 | elf_i386_gc_sweep_hook (abfd, info, sec, relocs) |
| 985 | bfd *abfd; |
| 986 | struct bfd_link_info *info; |
| 987 | asection *sec; |
| 988 | const Elf_Internal_Rela *relocs; |
| 989 | { |
| 990 | Elf_Internal_Shdr *symtab_hdr; |
| 991 | struct elf_link_hash_entry **sym_hashes; |
| 992 | bfd_signed_vma *local_got_refcounts; |
| 993 | const Elf_Internal_Rela *rel, *relend; |
| 994 | unsigned long r_symndx; |
| 995 | struct elf_link_hash_entry *h; |
| 996 | bfd *dynobj; |
| 997 | |
| 998 | elf_section_data (sec)->local_dynrel = 0; |
| 999 | |
| 1000 | dynobj = elf_hash_table (info)->dynobj; |
| 1001 | if (dynobj == NULL) |
| 1002 | return true; |
| 1003 | |
| 1004 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 1005 | sym_hashes = elf_sym_hashes (abfd); |
| 1006 | local_got_refcounts = elf_local_got_refcounts (abfd); |
| 1007 | |
| 1008 | relend = relocs + sec->reloc_count; |
| 1009 | for (rel = relocs; rel < relend; rel++) |
| 1010 | switch (ELF32_R_TYPE (rel->r_info)) |
| 1011 | { |
| 1012 | case R_386_GOT32: |
| 1013 | case R_386_GOTOFF: |
| 1014 | case R_386_GOTPC: |
| 1015 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 1016 | if (r_symndx >= symtab_hdr->sh_info) |
| 1017 | { |
| 1018 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 1019 | if (h->got.refcount > 0) |
| 1020 | h->got.refcount -= 1; |
| 1021 | } |
| 1022 | else if (local_got_refcounts != NULL) |
| 1023 | { |
| 1024 | if (local_got_refcounts[r_symndx] > 0) |
| 1025 | local_got_refcounts[r_symndx] -= 1; |
| 1026 | } |
| 1027 | break; |
| 1028 | |
| 1029 | case R_386_32: |
| 1030 | case R_386_PC32: |
| 1031 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 1032 | if (r_symndx >= symtab_hdr->sh_info) |
| 1033 | { |
| 1034 | struct elf_i386_link_hash_entry *eh; |
| 1035 | struct elf_i386_dyn_relocs **pp; |
| 1036 | struct elf_i386_dyn_relocs *p; |
| 1037 | |
| 1038 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 1039 | |
| 1040 | if (!info->shared && h->plt.refcount > 0) |
| 1041 | h->plt.refcount -= 1; |
| 1042 | |
| 1043 | eh = (struct elf_i386_link_hash_entry *) h; |
| 1044 | |
| 1045 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) |
| 1046 | if (p->sec == sec) |
| 1047 | { |
| 1048 | if (ELF32_R_TYPE (rel->r_info) == R_386_PC32) |
| 1049 | p->pc_count -= 1; |
| 1050 | p->count -= 1; |
| 1051 | if (p->count == 0) |
| 1052 | *pp = p->next; |
| 1053 | break; |
| 1054 | } |
| 1055 | } |
| 1056 | break; |
| 1057 | |
| 1058 | case R_386_PLT32: |
| 1059 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 1060 | if (r_symndx >= symtab_hdr->sh_info) |
| 1061 | { |
| 1062 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 1063 | if (h->plt.refcount > 0) |
| 1064 | h->plt.refcount -= 1; |
| 1065 | } |
| 1066 | break; |
| 1067 | |
| 1068 | default: |
| 1069 | break; |
| 1070 | } |
| 1071 | |
| 1072 | return true; |
| 1073 | } |
| 1074 | |
| 1075 | /* Adjust a symbol defined by a dynamic object and referenced by a |
| 1076 | regular object. The current definition is in some section of the |
| 1077 | dynamic object, but we're not including those sections. We have to |
| 1078 | change the definition to something the rest of the link can |
| 1079 | understand. */ |
| 1080 | |
| 1081 | static boolean |
| 1082 | elf_i386_adjust_dynamic_symbol (info, h) |
| 1083 | struct bfd_link_info *info; |
| 1084 | struct elf_link_hash_entry *h; |
| 1085 | { |
| 1086 | struct elf_i386_link_hash_table *htab; |
| 1087 | bfd *dynobj; |
| 1088 | struct elf_i386_link_hash_entry * eh; |
| 1089 | struct elf_i386_dyn_relocs *p; |
| 1090 | asection *s; |
| 1091 | unsigned int power_of_two; |
| 1092 | |
| 1093 | htab = elf_i386_hash_table (info); |
| 1094 | dynobj = htab->elf.dynobj; |
| 1095 | |
| 1096 | /* If this is a function, put it in the procedure linkage table. We |
| 1097 | will fill in the contents of the procedure linkage table later, |
| 1098 | when we know the address of the .got section. */ |
| 1099 | if (h->type == STT_FUNC |
| 1100 | || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) |
| 1101 | { |
| 1102 | if (h->plt.refcount <= 0 |
| 1103 | || (! info->shared |
| 1104 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 |
| 1105 | && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0)) |
| 1106 | { |
| 1107 | /* This case can occur if we saw a PLT32 reloc in an input |
| 1108 | file, but the symbol was never referred to by a dynamic |
| 1109 | object, or if all references were garbage collected. In |
| 1110 | such a case, we don't actually need to build a procedure |
| 1111 | linkage table, and we can just do a PC32 reloc instead. */ |
| 1112 | h->plt.refcount = (bfd_vma) -1; |
| 1113 | h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; |
| 1114 | } |
| 1115 | |
| 1116 | return true; |
| 1117 | } |
| 1118 | else |
| 1119 | /* It's possible that we incorrectly decided a .plt reloc was |
| 1120 | needed for an R_386_PC32 reloc to a non-function sym in |
| 1121 | check_relocs. We can't decide accurately between function and |
| 1122 | non-function syms in check-relocs; Objects loaded later in |
| 1123 | the link may change h->type. So fix it now. */ |
| 1124 | h->plt.refcount = (bfd_vma) -1; |
| 1125 | |
| 1126 | /* If this is a weak symbol, and there is a real definition, the |
| 1127 | processor independent code will have arranged for us to see the |
| 1128 | real definition first, and we can just use the same value. */ |
| 1129 | if (h->weakdef != NULL) |
| 1130 | { |
| 1131 | BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined |
| 1132 | || h->weakdef->root.type == bfd_link_hash_defweak); |
| 1133 | h->root.u.def.section = h->weakdef->root.u.def.section; |
| 1134 | h->root.u.def.value = h->weakdef->root.u.def.value; |
| 1135 | } |
| 1136 | |
| 1137 | /* This is a reference to a symbol defined by a dynamic object which |
| 1138 | is not a function. */ |
| 1139 | |
| 1140 | /* If we are creating a shared library, we must presume that the |
| 1141 | only references to the symbol are via the global offset table. |
| 1142 | For such cases we need not do anything here; the relocations will |
| 1143 | be handled correctly by relocate_section. */ |
| 1144 | if (info->shared) |
| 1145 | return true; |
| 1146 | |
| 1147 | /* If there are no references to this symbol that do not use the |
| 1148 | GOT, we don't need to generate a copy reloc. */ |
| 1149 | if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0) |
| 1150 | return true; |
| 1151 | |
| 1152 | eh = (struct elf_i386_link_hash_entry *) h; |
| 1153 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 1154 | { |
| 1155 | s = p->sec->output_section; |
| 1156 | if (s != NULL && (s->flags & SEC_READONLY) != 0) |
| 1157 | break; |
| 1158 | } |
| 1159 | |
| 1160 | /* If we didn't find any dynamic relocs in read-only sections, then |
| 1161 | we'll be keeping the dynamic relocs and avoiding the copy reloc. */ |
| 1162 | if (p == NULL) |
| 1163 | { |
| 1164 | h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF; |
| 1165 | return true; |
| 1166 | } |
| 1167 | |
| 1168 | /* We must allocate the symbol in our .dynbss section, which will |
| 1169 | become part of the .bss section of the executable. There will be |
| 1170 | an entry for this symbol in the .dynsym section. The dynamic |
| 1171 | object will contain position independent code, so all references |
| 1172 | from the dynamic object to this symbol will go through the global |
| 1173 | offset table. The dynamic linker will use the .dynsym entry to |
| 1174 | determine the address it must put in the global offset table, so |
| 1175 | both the dynamic object and the regular object will refer to the |
| 1176 | same memory location for the variable. */ |
| 1177 | |
| 1178 | s = htab->sdynbss; |
| 1179 | if (s == NULL) |
| 1180 | abort (); |
| 1181 | |
| 1182 | /* We must generate a R_386_COPY reloc to tell the dynamic linker to |
| 1183 | copy the initial value out of the dynamic object and into the |
| 1184 | runtime process image. We need to remember the offset into the |
| 1185 | .rel.bss section we are going to use. */ |
| 1186 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) |
| 1187 | { |
| 1188 | asection *srel; |
| 1189 | |
| 1190 | srel = htab->srelbss; |
| 1191 | if (srel == NULL) |
| 1192 | abort (); |
| 1193 | srel->_raw_size += sizeof (Elf32_External_Rel); |
| 1194 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; |
| 1195 | } |
| 1196 | |
| 1197 | /* We need to figure out the alignment required for this symbol. I |
| 1198 | have no idea how ELF linkers handle this. */ |
| 1199 | power_of_two = bfd_log2 (h->size); |
| 1200 | if (power_of_two > 3) |
| 1201 | power_of_two = 3; |
| 1202 | |
| 1203 | /* Apply the required alignment. */ |
| 1204 | s->_raw_size = BFD_ALIGN (s->_raw_size, |
| 1205 | (bfd_size_type) (1 << power_of_two)); |
| 1206 | if (power_of_two > bfd_get_section_alignment (dynobj, s)) |
| 1207 | { |
| 1208 | if (! bfd_set_section_alignment (dynobj, s, power_of_two)) |
| 1209 | return false; |
| 1210 | } |
| 1211 | |
| 1212 | /* Define the symbol as being at this point in the section. */ |
| 1213 | h->root.u.def.section = s; |
| 1214 | h->root.u.def.value = s->_raw_size; |
| 1215 | |
| 1216 | /* Increment the section size to make room for the symbol. */ |
| 1217 | s->_raw_size += h->size; |
| 1218 | |
| 1219 | return true; |
| 1220 | } |
| 1221 | |
| 1222 | /* This is the condition under which elf_i386_finish_dynamic_symbol |
| 1223 | will be called from elflink.h. If elflink.h doesn't call our |
| 1224 | finish_dynamic_symbol routine, we'll need to do something about |
| 1225 | initializing any .plt and .got entries in elf_i386_relocate_section. */ |
| 1226 | #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, INFO, H) \ |
| 1227 | ((DYN) \ |
| 1228 | && ((INFO)->shared \ |
| 1229 | || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \ |
| 1230 | && ((H)->dynindx != -1 \ |
| 1231 | || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)) |
| 1232 | |
| 1233 | /* Allocate space in .plt, .got and associated reloc sections for |
| 1234 | dynamic relocs. */ |
| 1235 | |
| 1236 | static boolean |
| 1237 | allocate_dynrelocs (h, inf) |
| 1238 | struct elf_link_hash_entry *h; |
| 1239 | PTR inf; |
| 1240 | { |
| 1241 | struct bfd_link_info *info; |
| 1242 | struct elf_i386_link_hash_table *htab; |
| 1243 | asection *s; |
| 1244 | struct elf_i386_link_hash_entry *eh; |
| 1245 | struct elf_i386_dyn_relocs *p; |
| 1246 | |
| 1247 | if (h->root.type == bfd_link_hash_indirect |
| 1248 | || h->root.type == bfd_link_hash_warning) |
| 1249 | return true; |
| 1250 | |
| 1251 | info = (struct bfd_link_info *) inf; |
| 1252 | htab = elf_i386_hash_table (info); |
| 1253 | |
| 1254 | if (htab->elf.dynamic_sections_created |
| 1255 | && h->plt.refcount > 0) |
| 1256 | { |
| 1257 | /* Make sure this symbol is output as a dynamic symbol. |
| 1258 | Undefined weak syms won't yet be marked as dynamic. */ |
| 1259 | if (h->dynindx == -1 |
| 1260 | && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) |
| 1261 | { |
| 1262 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) |
| 1263 | return false; |
| 1264 | } |
| 1265 | |
| 1266 | if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, info, h)) |
| 1267 | { |
| 1268 | s = htab->splt; |
| 1269 | if (s == NULL) |
| 1270 | abort (); |
| 1271 | |
| 1272 | /* If this is the first .plt entry, make room for the special |
| 1273 | first entry. */ |
| 1274 | if (s->_raw_size == 0) |
| 1275 | s->_raw_size += PLT_ENTRY_SIZE; |
| 1276 | |
| 1277 | h->plt.offset = s->_raw_size; |
| 1278 | |
| 1279 | /* If this symbol is not defined in a regular file, and we are |
| 1280 | not generating a shared library, then set the symbol to this |
| 1281 | location in the .plt. This is required to make function |
| 1282 | pointers compare as equal between the normal executable and |
| 1283 | the shared library. */ |
| 1284 | if (! info->shared |
| 1285 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 1286 | { |
| 1287 | h->root.u.def.section = s; |
| 1288 | h->root.u.def.value = h->plt.offset; |
| 1289 | } |
| 1290 | |
| 1291 | /* Make room for this entry. */ |
| 1292 | s->_raw_size += PLT_ENTRY_SIZE; |
| 1293 | |
| 1294 | /* We also need to make an entry in the .got.plt section, which |
| 1295 | will be placed in the .got section by the linker script. */ |
| 1296 | s = htab->sgotplt; |
| 1297 | if (s == NULL) |
| 1298 | abort (); |
| 1299 | s->_raw_size += 4; |
| 1300 | |
| 1301 | /* We also need to make an entry in the .rel.plt section. */ |
| 1302 | s = htab->srelplt; |
| 1303 | if (s == NULL) |
| 1304 | abort (); |
| 1305 | s->_raw_size += sizeof (Elf32_External_Rel); |
| 1306 | } |
| 1307 | else |
| 1308 | { |
| 1309 | h->plt.offset = (bfd_vma) -1; |
| 1310 | h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; |
| 1311 | } |
| 1312 | } |
| 1313 | else |
| 1314 | { |
| 1315 | h->plt.offset = (bfd_vma) -1; |
| 1316 | h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; |
| 1317 | } |
| 1318 | |
| 1319 | if (h->got.refcount > 0) |
| 1320 | { |
| 1321 | boolean dyn; |
| 1322 | |
| 1323 | /* Make sure this symbol is output as a dynamic symbol. |
| 1324 | Undefined weak syms won't yet be marked as dynamic. */ |
| 1325 | if (h->dynindx == -1 |
| 1326 | && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) |
| 1327 | { |
| 1328 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) |
| 1329 | return false; |
| 1330 | } |
| 1331 | |
| 1332 | s = htab->sgot; |
| 1333 | h->got.offset = s->_raw_size; |
| 1334 | s->_raw_size += 4; |
| 1335 | dyn = htab->elf.dynamic_sections_created; |
| 1336 | if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h)) |
| 1337 | htab->srelgot->_raw_size += sizeof (Elf32_External_Rel); |
| 1338 | } |
| 1339 | else |
| 1340 | h->got.offset = (bfd_vma) -1; |
| 1341 | |
| 1342 | eh = (struct elf_i386_link_hash_entry *) h; |
| 1343 | if (eh->dyn_relocs == NULL) |
| 1344 | return true; |
| 1345 | |
| 1346 | /* In the shared -Bsymbolic case, discard space allocated for |
| 1347 | dynamic pc-relative relocs against symbols which turn out to be |
| 1348 | defined in regular objects. For the normal shared case, discard |
| 1349 | space for relocs that have become local due to symbol visibility |
| 1350 | changes. */ |
| 1351 | |
| 1352 | if (info->shared) |
| 1353 | { |
| 1354 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0 |
| 1355 | && ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0 |
| 1356 | || info->symbolic)) |
| 1357 | { |
| 1358 | struct elf_i386_dyn_relocs **pp; |
| 1359 | |
| 1360 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) |
| 1361 | { |
| 1362 | p->count -= p->pc_count; |
| 1363 | p->pc_count = 0; |
| 1364 | if (p->count == 0) |
| 1365 | *pp = p->next; |
| 1366 | else |
| 1367 | pp = &p->next; |
| 1368 | } |
| 1369 | } |
| 1370 | } |
| 1371 | else |
| 1372 | { |
| 1373 | /* For the non-shared case, discard space for relocs against |
| 1374 | symbols which turn out to need copy relocs or are not |
| 1375 | dynamic. */ |
| 1376 | |
| 1377 | if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0 |
| 1378 | && (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0 |
| 1379 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 1380 | || (htab->elf.dynamic_sections_created |
| 1381 | && (h->root.type == bfd_link_hash_undefweak |
| 1382 | || h->root.type == bfd_link_hash_undefined)))) |
| 1383 | { |
| 1384 | /* Make sure this symbol is output as a dynamic symbol. |
| 1385 | Undefined weak syms won't yet be marked as dynamic. */ |
| 1386 | if (h->dynindx == -1 |
| 1387 | && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) |
| 1388 | { |
| 1389 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) |
| 1390 | return false; |
| 1391 | } |
| 1392 | |
| 1393 | /* If that succeeded, we know we'll be keeping all the |
| 1394 | relocs. */ |
| 1395 | if (h->dynindx != -1) |
| 1396 | goto keep; |
| 1397 | } |
| 1398 | |
| 1399 | eh->dyn_relocs = NULL; |
| 1400 | |
| 1401 | keep: |
| 1402 | } |
| 1403 | |
| 1404 | /* Finally, allocate space. */ |
| 1405 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 1406 | { |
| 1407 | asection *sreloc = elf_section_data (p->sec)->sreloc; |
| 1408 | sreloc->_raw_size += p->count * sizeof (Elf32_External_Rel); |
| 1409 | } |
| 1410 | |
| 1411 | return true; |
| 1412 | } |
| 1413 | |
| 1414 | /* Find any dynamic relocs that apply to read-only sections. */ |
| 1415 | |
| 1416 | static boolean |
| 1417 | readonly_dynrelocs (h, inf) |
| 1418 | struct elf_link_hash_entry *h; |
| 1419 | PTR inf; |
| 1420 | { |
| 1421 | struct elf_i386_link_hash_entry *eh; |
| 1422 | struct elf_i386_dyn_relocs *p; |
| 1423 | |
| 1424 | eh = (struct elf_i386_link_hash_entry *) h; |
| 1425 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 1426 | { |
| 1427 | asection *s = p->sec->output_section; |
| 1428 | |
| 1429 | if (s != NULL && (s->flags & SEC_READONLY) != 0) |
| 1430 | { |
| 1431 | struct bfd_link_info *info = (struct bfd_link_info *) inf; |
| 1432 | |
| 1433 | info->flags |= DF_TEXTREL; |
| 1434 | |
| 1435 | /* Not an error, just cut short the traversal. */ |
| 1436 | return false; |
| 1437 | } |
| 1438 | } |
| 1439 | return true; |
| 1440 | } |
| 1441 | |
| 1442 | /* Set the sizes of the dynamic sections. */ |
| 1443 | |
| 1444 | static boolean |
| 1445 | elf_i386_size_dynamic_sections (output_bfd, info) |
| 1446 | bfd *output_bfd ATTRIBUTE_UNUSED; |
| 1447 | struct bfd_link_info *info; |
| 1448 | { |
| 1449 | struct elf_i386_link_hash_table *htab; |
| 1450 | bfd *dynobj; |
| 1451 | asection *s; |
| 1452 | boolean relocs; |
| 1453 | bfd *ibfd; |
| 1454 | |
| 1455 | htab = elf_i386_hash_table (info); |
| 1456 | dynobj = htab->elf.dynobj; |
| 1457 | if (dynobj == NULL) |
| 1458 | abort (); |
| 1459 | |
| 1460 | if (htab->elf.dynamic_sections_created) |
| 1461 | { |
| 1462 | /* Set the contents of the .interp section to the interpreter. */ |
| 1463 | if (! info->shared) |
| 1464 | { |
| 1465 | s = bfd_get_section_by_name (dynobj, ".interp"); |
| 1466 | if (s == NULL) |
| 1467 | abort (); |
| 1468 | s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; |
| 1469 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; |
| 1470 | } |
| 1471 | } |
| 1472 | |
| 1473 | /* Set up .got offsets for local syms, and space for local dynamic |
| 1474 | relocs. */ |
| 1475 | for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) |
| 1476 | { |
| 1477 | bfd_signed_vma *local_got; |
| 1478 | bfd_signed_vma *end_local_got; |
| 1479 | bfd_size_type locsymcount; |
| 1480 | Elf_Internal_Shdr *symtab_hdr; |
| 1481 | asection *srel; |
| 1482 | |
| 1483 | if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour) |
| 1484 | continue; |
| 1485 | |
| 1486 | for (s = ibfd->sections; s != NULL; s = s->next) |
| 1487 | { |
| 1488 | bfd_size_type count = elf_section_data (s)->local_dynrel; |
| 1489 | |
| 1490 | if (count != 0) |
| 1491 | { |
| 1492 | srel = elf_section_data (s)->sreloc; |
| 1493 | srel->_raw_size += count * sizeof (Elf32_External_Rel); |
| 1494 | } |
| 1495 | } |
| 1496 | |
| 1497 | local_got = elf_local_got_refcounts (ibfd); |
| 1498 | if (!local_got) |
| 1499 | continue; |
| 1500 | |
| 1501 | symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; |
| 1502 | locsymcount = symtab_hdr->sh_info; |
| 1503 | end_local_got = local_got + locsymcount; |
| 1504 | s = htab->sgot; |
| 1505 | srel = htab->srelgot; |
| 1506 | for (; local_got < end_local_got; ++local_got) |
| 1507 | { |
| 1508 | if (*local_got > 0) |
| 1509 | { |
| 1510 | *local_got = s->_raw_size; |
| 1511 | s->_raw_size += 4; |
| 1512 | if (info->shared) |
| 1513 | srel->_raw_size += sizeof (Elf32_External_Rel); |
| 1514 | } |
| 1515 | else |
| 1516 | *local_got = (bfd_vma) -1; |
| 1517 | } |
| 1518 | } |
| 1519 | |
| 1520 | /* Allocate global sym .plt and .got entries, and space for global |
| 1521 | sym dynamic relocs. */ |
| 1522 | elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info); |
| 1523 | |
| 1524 | /* We now have determined the sizes of the various dynamic sections. |
| 1525 | Allocate memory for them. */ |
| 1526 | relocs = false; |
| 1527 | for (s = dynobj->sections; s != NULL; s = s->next) |
| 1528 | { |
| 1529 | if ((s->flags & SEC_LINKER_CREATED) == 0) |
| 1530 | continue; |
| 1531 | |
| 1532 | if (s == htab->splt |
| 1533 | || s == htab->sgot |
| 1534 | || s == htab->sgotplt) |
| 1535 | { |
| 1536 | /* Strip this section if we don't need it; see the |
| 1537 | comment below. */ |
| 1538 | } |
| 1539 | else if (strncmp (bfd_get_section_name (dynobj, s), ".rel", 4) == 0) |
| 1540 | { |
| 1541 | if (s->_raw_size == 0) |
| 1542 | { |
| 1543 | /* If we don't need this section, strip it from the |
| 1544 | output file. This is mostly to handle .rel.bss and |
| 1545 | .rel.plt. We must create both sections in |
| 1546 | create_dynamic_sections, because they must be created |
| 1547 | before the linker maps input sections to output |
| 1548 | sections. The linker does that before |
| 1549 | adjust_dynamic_symbol is called, and it is that |
| 1550 | function which decides whether anything needs to go |
| 1551 | into these sections. */ |
| 1552 | } |
| 1553 | else |
| 1554 | { |
| 1555 | if (s != htab->srelplt) |
| 1556 | relocs = true; |
| 1557 | |
| 1558 | /* We use the reloc_count field as a counter if we need |
| 1559 | to copy relocs into the output file. */ |
| 1560 | s->reloc_count = 0; |
| 1561 | } |
| 1562 | } |
| 1563 | else |
| 1564 | { |
| 1565 | /* It's not one of our sections, so don't allocate space. */ |
| 1566 | continue; |
| 1567 | } |
| 1568 | |
| 1569 | if (s->_raw_size == 0) |
| 1570 | { |
| 1571 | _bfd_strip_section_from_output (info, s); |
| 1572 | continue; |
| 1573 | } |
| 1574 | |
| 1575 | /* Allocate memory for the section contents. We use bfd_zalloc |
| 1576 | here in case unused entries are not reclaimed before the |
| 1577 | section's contents are written out. This should not happen, |
| 1578 | but this way if it does, we get a R_386_NONE reloc instead |
| 1579 | of garbage. */ |
| 1580 | s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size); |
| 1581 | if (s->contents == NULL) |
| 1582 | return false; |
| 1583 | } |
| 1584 | |
| 1585 | if (htab->elf.dynamic_sections_created) |
| 1586 | { |
| 1587 | /* Add some entries to the .dynamic section. We fill in the |
| 1588 | values later, in elf_i386_finish_dynamic_sections, but we |
| 1589 | must add the entries now so that we get the correct size for |
| 1590 | the .dynamic section. The DT_DEBUG entry is filled in by the |
| 1591 | dynamic linker and used by the debugger. */ |
| 1592 | #define add_dynamic_entry(TAG, VAL) \ |
| 1593 | bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL)) |
| 1594 | |
| 1595 | if (! info->shared) |
| 1596 | { |
| 1597 | if (!add_dynamic_entry (DT_DEBUG, 0)) |
| 1598 | return false; |
| 1599 | } |
| 1600 | |
| 1601 | if (htab->splt->_raw_size != 0) |
| 1602 | { |
| 1603 | if (!add_dynamic_entry (DT_PLTGOT, 0) |
| 1604 | || !add_dynamic_entry (DT_PLTRELSZ, 0) |
| 1605 | || !add_dynamic_entry (DT_PLTREL, DT_REL) |
| 1606 | || !add_dynamic_entry (DT_JMPREL, 0)) |
| 1607 | return false; |
| 1608 | } |
| 1609 | |
| 1610 | if (relocs) |
| 1611 | { |
| 1612 | if (!add_dynamic_entry (DT_REL, 0) |
| 1613 | || !add_dynamic_entry (DT_RELSZ, 0) |
| 1614 | || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel))) |
| 1615 | return false; |
| 1616 | |
| 1617 | /* If any dynamic relocs apply to a read-only section, |
| 1618 | then we need a DT_TEXTREL entry. */ |
| 1619 | elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, (PTR) info); |
| 1620 | |
| 1621 | if ((info->flags & DF_TEXTREL) != 0) |
| 1622 | { |
| 1623 | if (!add_dynamic_entry (DT_TEXTREL, 0)) |
| 1624 | return false; |
| 1625 | } |
| 1626 | } |
| 1627 | } |
| 1628 | #undef add_dynamic_entry |
| 1629 | |
| 1630 | return true; |
| 1631 | } |
| 1632 | |
| 1633 | /* Set the correct type for an x86 ELF section. We do this by the |
| 1634 | section name, which is a hack, but ought to work. */ |
| 1635 | |
| 1636 | static boolean |
| 1637 | elf_i386_fake_sections (abfd, hdr, sec) |
| 1638 | bfd *abfd ATTRIBUTE_UNUSED; |
| 1639 | Elf32_Internal_Shdr *hdr; |
| 1640 | asection *sec; |
| 1641 | { |
| 1642 | register const char *name; |
| 1643 | |
| 1644 | name = bfd_get_section_name (abfd, sec); |
| 1645 | |
| 1646 | /* This is an ugly, but unfortunately necessary hack that is |
| 1647 | needed when producing EFI binaries on x86. It tells |
| 1648 | elf.c:elf_fake_sections() not to consider ".reloc" as a section |
| 1649 | containing ELF relocation info. We need this hack in order to |
| 1650 | be able to generate ELF binaries that can be translated into |
| 1651 | EFI applications (which are essentially COFF objects). Those |
| 1652 | files contain a COFF ".reloc" section inside an ELFNN object, |
| 1653 | which would normally cause BFD to segfault because it would |
| 1654 | attempt to interpret this section as containing relocation |
| 1655 | entries for section "oc". With this hack enabled, ".reloc" |
| 1656 | will be treated as a normal data section, which will avoid the |
| 1657 | segfault. However, you won't be able to create an ELFNN binary |
| 1658 | with a section named "oc" that needs relocations, but that's |
| 1659 | the kind of ugly side-effects you get when detecting section |
| 1660 | types based on their names... In practice, this limitation is |
| 1661 | unlikely to bite. */ |
| 1662 | if (strcmp (name, ".reloc") == 0) |
| 1663 | hdr->sh_type = SHT_PROGBITS; |
| 1664 | |
| 1665 | return true; |
| 1666 | } |
| 1667 | |
| 1668 | /* Relocate an i386 ELF section. */ |
| 1669 | |
| 1670 | static boolean |
| 1671 | elf_i386_relocate_section (output_bfd, info, input_bfd, input_section, |
| 1672 | contents, relocs, local_syms, local_sections) |
| 1673 | bfd *output_bfd; |
| 1674 | struct bfd_link_info *info; |
| 1675 | bfd *input_bfd; |
| 1676 | asection *input_section; |
| 1677 | bfd_byte *contents; |
| 1678 | Elf_Internal_Rela *relocs; |
| 1679 | Elf_Internal_Sym *local_syms; |
| 1680 | asection **local_sections; |
| 1681 | { |
| 1682 | struct elf_i386_link_hash_table *htab; |
| 1683 | bfd *dynobj; |
| 1684 | Elf_Internal_Shdr *symtab_hdr; |
| 1685 | struct elf_link_hash_entry **sym_hashes; |
| 1686 | bfd_vma *local_got_offsets; |
| 1687 | Elf_Internal_Rela *rel; |
| 1688 | Elf_Internal_Rela *relend; |
| 1689 | |
| 1690 | htab = elf_i386_hash_table (info); |
| 1691 | dynobj = htab->elf.dynobj; |
| 1692 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 1693 | sym_hashes = elf_sym_hashes (input_bfd); |
| 1694 | local_got_offsets = elf_local_got_offsets (input_bfd); |
| 1695 | |
| 1696 | rel = relocs; |
| 1697 | relend = relocs + input_section->reloc_count; |
| 1698 | for (; rel < relend; rel++) |
| 1699 | { |
| 1700 | int r_type; |
| 1701 | reloc_howto_type *howto; |
| 1702 | unsigned long r_symndx; |
| 1703 | struct elf_link_hash_entry *h; |
| 1704 | Elf_Internal_Sym *sym; |
| 1705 | asection *sec; |
| 1706 | bfd_vma off; |
| 1707 | bfd_vma relocation; |
| 1708 | boolean unresolved_reloc; |
| 1709 | bfd_reloc_status_type r; |
| 1710 | unsigned int indx; |
| 1711 | |
| 1712 | r_type = ELF32_R_TYPE (rel->r_info); |
| 1713 | if (r_type == (int) R_386_GNU_VTINHERIT |
| 1714 | || r_type == (int) R_386_GNU_VTENTRY) |
| 1715 | continue; |
| 1716 | |
| 1717 | if ((indx = (unsigned) r_type) >= R_386_standard |
| 1718 | && ((indx = (unsigned) r_type - R_386_ext_offset) - R_386_standard |
| 1719 | >= R_386_ext - R_386_standard)) |
| 1720 | { |
| 1721 | bfd_set_error (bfd_error_bad_value); |
| 1722 | return false; |
| 1723 | } |
| 1724 | howto = elf_howto_table + indx; |
| 1725 | |
| 1726 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 1727 | |
| 1728 | if (info->relocateable) |
| 1729 | { |
| 1730 | /* This is a relocateable link. We don't have to change |
| 1731 | anything, unless the reloc is against a section symbol, |
| 1732 | in which case we have to adjust according to where the |
| 1733 | section symbol winds up in the output section. */ |
| 1734 | if (r_symndx < symtab_hdr->sh_info) |
| 1735 | { |
| 1736 | sym = local_syms + r_symndx; |
| 1737 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) |
| 1738 | { |
| 1739 | bfd_vma val; |
| 1740 | |
| 1741 | sec = local_sections[r_symndx]; |
| 1742 | val = bfd_get_32 (input_bfd, contents + rel->r_offset); |
| 1743 | val += sec->output_offset + sym->st_value; |
| 1744 | bfd_put_32 (input_bfd, val, contents + rel->r_offset); |
| 1745 | } |
| 1746 | } |
| 1747 | |
| 1748 | continue; |
| 1749 | } |
| 1750 | |
| 1751 | /* This is a final link. */ |
| 1752 | h = NULL; |
| 1753 | sym = NULL; |
| 1754 | sec = NULL; |
| 1755 | unresolved_reloc = false; |
| 1756 | if (r_symndx < symtab_hdr->sh_info) |
| 1757 | { |
| 1758 | sym = local_syms + r_symndx; |
| 1759 | sec = local_sections[r_symndx]; |
| 1760 | relocation = (sec->output_section->vma |
| 1761 | + sec->output_offset |
| 1762 | + sym->st_value); |
| 1763 | } |
| 1764 | else |
| 1765 | { |
| 1766 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 1767 | while (h->root.type == bfd_link_hash_indirect |
| 1768 | || h->root.type == bfd_link_hash_warning) |
| 1769 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1770 | |
| 1771 | relocation = 0; |
| 1772 | if (h->root.type == bfd_link_hash_defined |
| 1773 | || h->root.type == bfd_link_hash_defweak) |
| 1774 | { |
| 1775 | sec = h->root.u.def.section; |
| 1776 | if (sec->output_section == NULL) |
| 1777 | /* Set a flag that will be cleared later if we find a |
| 1778 | relocation value for this symbol. output_section |
| 1779 | is typically NULL for symbols satisfied by a shared |
| 1780 | library. */ |
| 1781 | unresolved_reloc = true; |
| 1782 | else |
| 1783 | relocation = (h->root.u.def.value |
| 1784 | + sec->output_section->vma |
| 1785 | + sec->output_offset); |
| 1786 | } |
| 1787 | else if (h->root.type == bfd_link_hash_undefweak) |
| 1788 | ; |
| 1789 | else if (info->shared |
| 1790 | && (!info->symbolic || info->allow_shlib_undefined) |
| 1791 | && !info->no_undefined |
| 1792 | && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) |
| 1793 | ; |
| 1794 | else |
| 1795 | { |
| 1796 | if (! ((*info->callbacks->undefined_symbol) |
| 1797 | (info, h->root.root.string, input_bfd, |
| 1798 | input_section, rel->r_offset, |
| 1799 | (!info->shared || info->no_undefined |
| 1800 | || ELF_ST_VISIBILITY (h->other))))) |
| 1801 | return false; |
| 1802 | } |
| 1803 | } |
| 1804 | |
| 1805 | switch (r_type) |
| 1806 | { |
| 1807 | case R_386_GOT32: |
| 1808 | /* Relocation is to the entry for this symbol in the global |
| 1809 | offset table. */ |
| 1810 | if (htab->sgot == NULL) |
| 1811 | abort (); |
| 1812 | |
| 1813 | if (h != NULL) |
| 1814 | { |
| 1815 | boolean dyn; |
| 1816 | |
| 1817 | off = h->got.offset; |
| 1818 | dyn = htab->elf.dynamic_sections_created; |
| 1819 | if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h) |
| 1820 | || (info->shared |
| 1821 | && (info->symbolic |
| 1822 | || h->dynindx == -1 |
| 1823 | || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL)) |
| 1824 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) |
| 1825 | { |
| 1826 | /* This is actually a static link, or it is a |
| 1827 | -Bsymbolic link and the symbol is defined |
| 1828 | locally, or the symbol was forced to be local |
| 1829 | because of a version file. We must initialize |
| 1830 | this entry in the global offset table. Since the |
| 1831 | offset must always be a multiple of 4, we use the |
| 1832 | least significant bit to record whether we have |
| 1833 | initialized it already. |
| 1834 | |
| 1835 | When doing a dynamic link, we create a .rel.got |
| 1836 | relocation entry to initialize the value. This |
| 1837 | is done in the finish_dynamic_symbol routine. */ |
| 1838 | if ((off & 1) != 0) |
| 1839 | off &= ~1; |
| 1840 | else |
| 1841 | { |
| 1842 | bfd_put_32 (output_bfd, relocation, |
| 1843 | htab->sgot->contents + off); |
| 1844 | h->got.offset |= 1; |
| 1845 | } |
| 1846 | } |
| 1847 | else |
| 1848 | unresolved_reloc = false; |
| 1849 | } |
| 1850 | else |
| 1851 | { |
| 1852 | if (local_got_offsets == NULL) |
| 1853 | abort (); |
| 1854 | |
| 1855 | off = local_got_offsets[r_symndx]; |
| 1856 | |
| 1857 | /* The offset must always be a multiple of 4. We use |
| 1858 | the least significant bit to record whether we have |
| 1859 | already generated the necessary reloc. */ |
| 1860 | if ((off & 1) != 0) |
| 1861 | off &= ~1; |
| 1862 | else |
| 1863 | { |
| 1864 | bfd_put_32 (output_bfd, relocation, |
| 1865 | htab->sgot->contents + off); |
| 1866 | |
| 1867 | if (info->shared) |
| 1868 | { |
| 1869 | asection *srelgot; |
| 1870 | Elf_Internal_Rel outrel; |
| 1871 | |
| 1872 | srelgot = htab->srelgot; |
| 1873 | if (srelgot == NULL) |
| 1874 | abort (); |
| 1875 | |
| 1876 | outrel.r_offset = (htab->sgot->output_section->vma |
| 1877 | + htab->sgot->output_offset |
| 1878 | + off); |
| 1879 | outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
| 1880 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, |
| 1881 | (((Elf32_External_Rel *) |
| 1882 | srelgot->contents) |
| 1883 | + srelgot->reloc_count)); |
| 1884 | ++srelgot->reloc_count; |
| 1885 | } |
| 1886 | |
| 1887 | local_got_offsets[r_symndx] |= 1; |
| 1888 | } |
| 1889 | } |
| 1890 | |
| 1891 | if (off >= (bfd_vma) -2) |
| 1892 | abort (); |
| 1893 | |
| 1894 | relocation = htab->sgot->output_offset + off; |
| 1895 | break; |
| 1896 | |
| 1897 | case R_386_GOTOFF: |
| 1898 | /* Relocation is relative to the start of the global offset |
| 1899 | table. */ |
| 1900 | |
| 1901 | /* Note that sgot->output_offset is not involved in this |
| 1902 | calculation. We always want the start of .got. If we |
| 1903 | defined _GLOBAL_OFFSET_TABLE in a different way, as is |
| 1904 | permitted by the ABI, we might have to change this |
| 1905 | calculation. */ |
| 1906 | relocation -= htab->sgot->output_section->vma; |
| 1907 | break; |
| 1908 | |
| 1909 | case R_386_GOTPC: |
| 1910 | /* Use global offset table as symbol value. */ |
| 1911 | relocation = htab->sgot->output_section->vma; |
| 1912 | unresolved_reloc = false; |
| 1913 | break; |
| 1914 | |
| 1915 | case R_386_PLT32: |
| 1916 | /* Relocation is to the entry for this symbol in the |
| 1917 | procedure linkage table. */ |
| 1918 | |
| 1919 | /* Resolve a PLT32 reloc against a local symbol directly, |
| 1920 | without using the procedure linkage table. */ |
| 1921 | if (h == NULL) |
| 1922 | break; |
| 1923 | |
| 1924 | if (h->plt.offset == (bfd_vma) -1 |
| 1925 | || htab->splt == NULL) |
| 1926 | { |
| 1927 | /* We didn't make a PLT entry for this symbol. This |
| 1928 | happens when statically linking PIC code, or when |
| 1929 | using -Bsymbolic. */ |
| 1930 | break; |
| 1931 | } |
| 1932 | |
| 1933 | relocation = (htab->splt->output_section->vma |
| 1934 | + htab->splt->output_offset |
| 1935 | + h->plt.offset); |
| 1936 | unresolved_reloc = false; |
| 1937 | break; |
| 1938 | |
| 1939 | case R_386_32: |
| 1940 | case R_386_PC32: |
| 1941 | if ((info->shared |
| 1942 | && (input_section->flags & SEC_ALLOC) != 0 |
| 1943 | && (r_type != R_386_PC32 |
| 1944 | || (h != NULL |
| 1945 | && h->dynindx != -1 |
| 1946 | && (! info->symbolic |
| 1947 | || (h->elf_link_hash_flags |
| 1948 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) |
| 1949 | || (!info->shared |
| 1950 | && (input_section->flags & SEC_ALLOC) != 0 |
| 1951 | && h != NULL |
| 1952 | && h->dynindx != -1 |
| 1953 | && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0 |
| 1954 | && (((h->elf_link_hash_flags |
| 1955 | & ELF_LINK_HASH_DEF_DYNAMIC) != 0 |
| 1956 | && (h->elf_link_hash_flags |
| 1957 | & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 1958 | || h->root.type == bfd_link_hash_undefweak |
| 1959 | || h->root.type == bfd_link_hash_undefined))) |
| 1960 | { |
| 1961 | Elf_Internal_Rel outrel; |
| 1962 | boolean skip, relocate; |
| 1963 | asection *sreloc; |
| 1964 | Elf32_External_Rel *loc; |
| 1965 | |
| 1966 | /* When generating a shared object, these relocations |
| 1967 | are copied into the output file to be resolved at run |
| 1968 | time. */ |
| 1969 | |
| 1970 | skip = false; |
| 1971 | |
| 1972 | if (elf_section_data (input_section)->stab_info == NULL) |
| 1973 | outrel.r_offset = rel->r_offset; |
| 1974 | else |
| 1975 | { |
| 1976 | off = (_bfd_stab_section_offset |
| 1977 | (output_bfd, htab->elf.stab_info, input_section, |
| 1978 | &elf_section_data (input_section)->stab_info, |
| 1979 | rel->r_offset)); |
| 1980 | if (off == (bfd_vma) -1) |
| 1981 | skip = true; |
| 1982 | outrel.r_offset = off; |
| 1983 | } |
| 1984 | |
| 1985 | outrel.r_offset += (input_section->output_section->vma |
| 1986 | + input_section->output_offset); |
| 1987 | |
| 1988 | if (skip) |
| 1989 | { |
| 1990 | memset (&outrel, 0, sizeof outrel); |
| 1991 | relocate = false; |
| 1992 | } |
| 1993 | else if (h != NULL |
| 1994 | && h->dynindx != -1 |
| 1995 | && (r_type == R_386_PC32 |
| 1996 | || !info->shared |
| 1997 | || !info->symbolic |
| 1998 | || (h->elf_link_hash_flags |
| 1999 | & ELF_LINK_HASH_DEF_REGULAR) == 0)) |
| 2000 | |
| 2001 | { |
| 2002 | relocate = false; |
| 2003 | outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); |
| 2004 | } |
| 2005 | else |
| 2006 | { |
| 2007 | /* This symbol is local, or marked to become local. */ |
| 2008 | relocate = true; |
| 2009 | outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
| 2010 | } |
| 2011 | |
| 2012 | sreloc = elf_section_data (input_section)->sreloc; |
| 2013 | if (sreloc == NULL) |
| 2014 | abort (); |
| 2015 | |
| 2016 | loc = ((Elf32_External_Rel *) sreloc->contents |
| 2017 | + sreloc->reloc_count); |
| 2018 | sreloc->reloc_count += 1; |
| 2019 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 2020 | |
| 2021 | /* If this reloc is against an external symbol, we do |
| 2022 | not want to fiddle with the addend. Otherwise, we |
| 2023 | need to include the symbol value so that it becomes |
| 2024 | an addend for the dynamic reloc. */ |
| 2025 | if (! relocate) |
| 2026 | continue; |
| 2027 | } |
| 2028 | |
| 2029 | break; |
| 2030 | |
| 2031 | default: |
| 2032 | break; |
| 2033 | } |
| 2034 | |
| 2035 | /* FIXME: Why do we allow debugging sections to escape this error? |
| 2036 | More importantly, why do we not emit dynamic relocs for |
| 2037 | R_386_32 above in debugging sections (which are ! SEC_ALLOC)? |
| 2038 | If we had emitted the dynamic reloc, we could remove the |
| 2039 | fudge here. */ |
| 2040 | if (unresolved_reloc |
| 2041 | && !(info->shared |
| 2042 | && (input_section->flags & SEC_DEBUGGING) != 0 |
| 2043 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0)) |
| 2044 | (*_bfd_error_handler) |
| 2045 | (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"), |
| 2046 | bfd_archive_filename (input_bfd), |
| 2047 | bfd_get_section_name (input_bfd, input_section), |
| 2048 | (long) rel->r_offset, |
| 2049 | h->root.root.string); |
| 2050 | |
| 2051 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 2052 | contents, rel->r_offset, |
| 2053 | relocation, (bfd_vma) 0); |
| 2054 | |
| 2055 | switch (r) |
| 2056 | { |
| 2057 | case bfd_reloc_ok: |
| 2058 | break; |
| 2059 | |
| 2060 | case bfd_reloc_overflow: |
| 2061 | { |
| 2062 | const char *name; |
| 2063 | |
| 2064 | if (h != NULL) |
| 2065 | name = h->root.root.string; |
| 2066 | else |
| 2067 | { |
| 2068 | name = bfd_elf_string_from_elf_section (input_bfd, |
| 2069 | symtab_hdr->sh_link, |
| 2070 | sym->st_name); |
| 2071 | if (name == NULL) |
| 2072 | return false; |
| 2073 | if (*name == '\0') |
| 2074 | name = bfd_section_name (input_bfd, sec); |
| 2075 | } |
| 2076 | if (! ((*info->callbacks->reloc_overflow) |
| 2077 | (info, name, howto->name, (bfd_vma) 0, |
| 2078 | input_bfd, input_section, rel->r_offset))) |
| 2079 | return false; |
| 2080 | } |
| 2081 | break; |
| 2082 | |
| 2083 | default: |
| 2084 | case bfd_reloc_outofrange: |
| 2085 | abort (); |
| 2086 | break; |
| 2087 | } |
| 2088 | } |
| 2089 | |
| 2090 | return true; |
| 2091 | } |
| 2092 | |
| 2093 | /* Finish up dynamic symbol handling. We set the contents of various |
| 2094 | dynamic sections here. */ |
| 2095 | |
| 2096 | static boolean |
| 2097 | elf_i386_finish_dynamic_symbol (output_bfd, info, h, sym) |
| 2098 | bfd *output_bfd; |
| 2099 | struct bfd_link_info *info; |
| 2100 | struct elf_link_hash_entry *h; |
| 2101 | Elf_Internal_Sym *sym; |
| 2102 | { |
| 2103 | struct elf_i386_link_hash_table *htab; |
| 2104 | bfd *dynobj; |
| 2105 | |
| 2106 | htab = elf_i386_hash_table (info); |
| 2107 | dynobj = htab->elf.dynobj; |
| 2108 | |
| 2109 | if (h->plt.offset != (bfd_vma) -1) |
| 2110 | { |
| 2111 | bfd_vma plt_index; |
| 2112 | bfd_vma got_offset; |
| 2113 | Elf_Internal_Rel rel; |
| 2114 | |
| 2115 | /* This symbol has an entry in the procedure linkage table. Set |
| 2116 | it up. */ |
| 2117 | |
| 2118 | if (h->dynindx == -1 |
| 2119 | || htab->splt == NULL |
| 2120 | || htab->sgotplt == NULL |
| 2121 | || htab->srelplt == NULL) |
| 2122 | abort (); |
| 2123 | |
| 2124 | /* Get the index in the procedure linkage table which |
| 2125 | corresponds to this symbol. This is the index of this symbol |
| 2126 | in all the symbols for which we are making plt entries. The |
| 2127 | first entry in the procedure linkage table is reserved. */ |
| 2128 | plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; |
| 2129 | |
| 2130 | /* Get the offset into the .got table of the entry that |
| 2131 | corresponds to this function. Each .got entry is 4 bytes. |
| 2132 | The first three are reserved. */ |
| 2133 | got_offset = (plt_index + 3) * 4; |
| 2134 | |
| 2135 | /* Fill in the entry in the procedure linkage table. */ |
| 2136 | if (! info->shared) |
| 2137 | { |
| 2138 | memcpy (htab->splt->contents + h->plt.offset, elf_i386_plt_entry, |
| 2139 | PLT_ENTRY_SIZE); |
| 2140 | bfd_put_32 (output_bfd, |
| 2141 | (htab->sgotplt->output_section->vma |
| 2142 | + htab->sgotplt->output_offset |
| 2143 | + got_offset), |
| 2144 | htab->splt->contents + h->plt.offset + 2); |
| 2145 | } |
| 2146 | else |
| 2147 | { |
| 2148 | memcpy (htab->splt->contents + h->plt.offset, elf_i386_pic_plt_entry, |
| 2149 | PLT_ENTRY_SIZE); |
| 2150 | bfd_put_32 (output_bfd, got_offset, |
| 2151 | htab->splt->contents + h->plt.offset + 2); |
| 2152 | } |
| 2153 | |
| 2154 | bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel), |
| 2155 | htab->splt->contents + h->plt.offset + 7); |
| 2156 | bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE), |
| 2157 | htab->splt->contents + h->plt.offset + 12); |
| 2158 | |
| 2159 | /* Fill in the entry in the global offset table. */ |
| 2160 | bfd_put_32 (output_bfd, |
| 2161 | (htab->splt->output_section->vma |
| 2162 | + htab->splt->output_offset |
| 2163 | + h->plt.offset |
| 2164 | + 6), |
| 2165 | htab->sgotplt->contents + got_offset); |
| 2166 | |
| 2167 | /* Fill in the entry in the .rel.plt section. */ |
| 2168 | rel.r_offset = (htab->sgotplt->output_section->vma |
| 2169 | + htab->sgotplt->output_offset |
| 2170 | + got_offset); |
| 2171 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT); |
| 2172 | bfd_elf32_swap_reloc_out (output_bfd, &rel, |
| 2173 | ((Elf32_External_Rel *) htab->srelplt->contents |
| 2174 | + plt_index)); |
| 2175 | |
| 2176 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 2177 | { |
| 2178 | /* Mark the symbol as undefined, rather than as defined in |
| 2179 | the .plt section. Leave the value alone. */ |
| 2180 | sym->st_shndx = SHN_UNDEF; |
| 2181 | } |
| 2182 | } |
| 2183 | |
| 2184 | if (h->got.offset != (bfd_vma) -1) |
| 2185 | { |
| 2186 | Elf_Internal_Rel rel; |
| 2187 | |
| 2188 | /* This symbol has an entry in the global offset table. Set it |
| 2189 | up. */ |
| 2190 | |
| 2191 | if (htab->sgot == NULL || htab->srelgot == NULL) |
| 2192 | abort (); |
| 2193 | |
| 2194 | rel.r_offset = (htab->sgot->output_section->vma |
| 2195 | + htab->sgot->output_offset |
| 2196 | + (h->got.offset & ~(bfd_vma) 1)); |
| 2197 | |
| 2198 | /* If this is a static link, or it is a -Bsymbolic link and the |
| 2199 | symbol is defined locally or was forced to be local because |
| 2200 | of a version file, we just want to emit a RELATIVE reloc. |
| 2201 | The entry in the global offset table will already have been |
| 2202 | initialized in the relocate_section function. */ |
| 2203 | if (info->shared |
| 2204 | && (info->symbolic |
| 2205 | || h->dynindx == -1 |
| 2206 | || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL)) |
| 2207 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) |
| 2208 | { |
| 2209 | BFD_ASSERT((h->got.offset & 1) != 0); |
| 2210 | rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
| 2211 | } |
| 2212 | else |
| 2213 | { |
| 2214 | BFD_ASSERT((h->got.offset & 1) == 0); |
| 2215 | bfd_put_32 (output_bfd, (bfd_vma) 0, |
| 2216 | htab->sgot->contents + h->got.offset); |
| 2217 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT); |
| 2218 | } |
| 2219 | |
| 2220 | bfd_elf32_swap_reloc_out (output_bfd, &rel, |
| 2221 | ((Elf32_External_Rel *) htab->srelgot->contents |
| 2222 | + htab->srelgot->reloc_count)); |
| 2223 | ++htab->srelgot->reloc_count; |
| 2224 | } |
| 2225 | |
| 2226 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) |
| 2227 | { |
| 2228 | Elf_Internal_Rel rel; |
| 2229 | |
| 2230 | /* This symbol needs a copy reloc. Set it up. */ |
| 2231 | |
| 2232 | if (h->dynindx == -1 |
| 2233 | || (h->root.type != bfd_link_hash_defined |
| 2234 | && h->root.type != bfd_link_hash_defweak) |
| 2235 | || htab->srelbss == NULL) |
| 2236 | abort (); |
| 2237 | |
| 2238 | rel.r_offset = (h->root.u.def.value |
| 2239 | + h->root.u.def.section->output_section->vma |
| 2240 | + h->root.u.def.section->output_offset); |
| 2241 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY); |
| 2242 | bfd_elf32_swap_reloc_out (output_bfd, &rel, |
| 2243 | ((Elf32_External_Rel *) htab->srelbss->contents |
| 2244 | + htab->srelbss->reloc_count)); |
| 2245 | ++htab->srelbss->reloc_count; |
| 2246 | } |
| 2247 | |
| 2248 | /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ |
| 2249 | if (strcmp (h->root.root.string, "_DYNAMIC") == 0 |
| 2250 | || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) |
| 2251 | sym->st_shndx = SHN_ABS; |
| 2252 | |
| 2253 | return true; |
| 2254 | } |
| 2255 | |
| 2256 | /* Used to decide how to sort relocs in an optimal manner for the |
| 2257 | dynamic linker, before writing them out. */ |
| 2258 | |
| 2259 | static enum elf_reloc_type_class |
| 2260 | elf_i386_reloc_type_class (rela) |
| 2261 | const Elf_Internal_Rela *rela; |
| 2262 | { |
| 2263 | switch ((int) ELF32_R_TYPE (rela->r_info)) |
| 2264 | { |
| 2265 | case R_386_RELATIVE: |
| 2266 | return reloc_class_relative; |
| 2267 | case R_386_JUMP_SLOT: |
| 2268 | return reloc_class_plt; |
| 2269 | case R_386_COPY: |
| 2270 | return reloc_class_copy; |
| 2271 | default: |
| 2272 | return reloc_class_normal; |
| 2273 | } |
| 2274 | } |
| 2275 | |
| 2276 | /* Finish up the dynamic sections. */ |
| 2277 | |
| 2278 | static boolean |
| 2279 | elf_i386_finish_dynamic_sections (output_bfd, info) |
| 2280 | bfd *output_bfd; |
| 2281 | struct bfd_link_info *info; |
| 2282 | { |
| 2283 | struct elf_i386_link_hash_table *htab; |
| 2284 | bfd *dynobj; |
| 2285 | asection *sdyn; |
| 2286 | |
| 2287 | htab = elf_i386_hash_table (info); |
| 2288 | dynobj = htab->elf.dynobj; |
| 2289 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); |
| 2290 | |
| 2291 | if (htab->elf.dynamic_sections_created) |
| 2292 | { |
| 2293 | Elf32_External_Dyn *dyncon, *dynconend; |
| 2294 | |
| 2295 | if (sdyn == NULL || htab->sgot == NULL) |
| 2296 | abort (); |
| 2297 | |
| 2298 | dyncon = (Elf32_External_Dyn *) sdyn->contents; |
| 2299 | dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size); |
| 2300 | for (; dyncon < dynconend; dyncon++) |
| 2301 | { |
| 2302 | Elf_Internal_Dyn dyn; |
| 2303 | |
| 2304 | bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); |
| 2305 | |
| 2306 | switch (dyn.d_tag) |
| 2307 | { |
| 2308 | default: |
| 2309 | break; |
| 2310 | |
| 2311 | case DT_PLTGOT: |
| 2312 | dyn.d_un.d_ptr = htab->sgot->output_section->vma; |
| 2313 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 2314 | break; |
| 2315 | |
| 2316 | case DT_JMPREL: |
| 2317 | dyn.d_un.d_ptr = htab->srelplt->output_section->vma; |
| 2318 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 2319 | break; |
| 2320 | |
| 2321 | case DT_PLTRELSZ: |
| 2322 | if (htab->srelplt->output_section->_cooked_size != 0) |
| 2323 | dyn.d_un.d_val = htab->srelplt->output_section->_cooked_size; |
| 2324 | else |
| 2325 | dyn.d_un.d_val = htab->srelplt->output_section->_raw_size; |
| 2326 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 2327 | break; |
| 2328 | |
| 2329 | case DT_RELSZ: |
| 2330 | /* My reading of the SVR4 ABI indicates that the |
| 2331 | procedure linkage table relocs (DT_JMPREL) should be |
| 2332 | included in the overall relocs (DT_REL). This is |
| 2333 | what Solaris does. However, UnixWare can not handle |
| 2334 | that case. Therefore, we override the DT_RELSZ entry |
| 2335 | here to make it not include the JMPREL relocs. Since |
| 2336 | the linker script arranges for .rel.plt to follow all |
| 2337 | other relocation sections, we don't have to worry |
| 2338 | about changing the DT_REL entry. */ |
| 2339 | if (htab->srelplt != NULL) |
| 2340 | { |
| 2341 | if (htab->srelplt->output_section->_cooked_size != 0) |
| 2342 | dyn.d_un.d_val -= htab->srelplt->output_section->_cooked_size; |
| 2343 | else |
| 2344 | dyn.d_un.d_val -= htab->srelplt->output_section->_raw_size; |
| 2345 | } |
| 2346 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 2347 | break; |
| 2348 | } |
| 2349 | } |
| 2350 | |
| 2351 | /* Fill in the first entry in the procedure linkage table. */ |
| 2352 | if (htab->splt && htab->splt->_raw_size > 0) |
| 2353 | { |
| 2354 | if (info->shared) |
| 2355 | memcpy (htab->splt->contents, |
| 2356 | elf_i386_pic_plt0_entry, PLT_ENTRY_SIZE); |
| 2357 | else |
| 2358 | { |
| 2359 | memcpy (htab->splt->contents, |
| 2360 | elf_i386_plt0_entry, PLT_ENTRY_SIZE); |
| 2361 | bfd_put_32 (output_bfd, |
| 2362 | (htab->sgotplt->output_section->vma |
| 2363 | + htab->sgotplt->output_offset |
| 2364 | + 4), |
| 2365 | htab->splt->contents + 2); |
| 2366 | bfd_put_32 (output_bfd, |
| 2367 | (htab->sgotplt->output_section->vma |
| 2368 | + htab->sgotplt->output_offset |
| 2369 | + 8), |
| 2370 | htab->splt->contents + 8); |
| 2371 | } |
| 2372 | |
| 2373 | /* UnixWare sets the entsize of .plt to 4, although that doesn't |
| 2374 | really seem like the right value. */ |
| 2375 | elf_section_data (htab->splt->output_section) |
| 2376 | ->this_hdr.sh_entsize = 4; |
| 2377 | } |
| 2378 | } |
| 2379 | |
| 2380 | if (htab->sgotplt) |
| 2381 | { |
| 2382 | /* Fill in the first three entries in the global offset table. */ |
| 2383 | if (htab->sgotplt->_raw_size > 0) |
| 2384 | { |
| 2385 | bfd_put_32 (output_bfd, |
| 2386 | (sdyn == NULL ? (bfd_vma) 0 |
| 2387 | : sdyn->output_section->vma + sdyn->output_offset), |
| 2388 | htab->sgotplt->contents); |
| 2389 | bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 4); |
| 2390 | bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8); |
| 2391 | } |
| 2392 | |
| 2393 | elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = 4; |
| 2394 | } |
| 2395 | return true; |
| 2396 | } |
| 2397 | |
| 2398 | #define TARGET_LITTLE_SYM bfd_elf32_i386_vec |
| 2399 | #define TARGET_LITTLE_NAME "elf32-i386" |
| 2400 | #define ELF_ARCH bfd_arch_i386 |
| 2401 | #define ELF_MACHINE_CODE EM_386 |
| 2402 | #define ELF_MAXPAGESIZE 0x1000 |
| 2403 | |
| 2404 | #define elf_backend_can_gc_sections 1 |
| 2405 | #define elf_backend_want_got_plt 1 |
| 2406 | #define elf_backend_plt_readonly 1 |
| 2407 | #define elf_backend_want_plt_sym 0 |
| 2408 | #define elf_backend_got_header_size 12 |
| 2409 | #define elf_backend_plt_header_size PLT_ENTRY_SIZE |
| 2410 | |
| 2411 | #define elf_info_to_howto elf_i386_info_to_howto |
| 2412 | #define elf_info_to_howto_rel elf_i386_info_to_howto_rel |
| 2413 | |
| 2414 | #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name |
| 2415 | #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create |
| 2416 | #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup |
| 2417 | |
| 2418 | #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol |
| 2419 | #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol |
| 2420 | #define elf_backend_check_relocs elf_i386_check_relocs |
| 2421 | #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections |
| 2422 | #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections |
| 2423 | #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol |
| 2424 | #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook |
| 2425 | #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook |
| 2426 | #define elf_backend_relocate_section elf_i386_relocate_section |
| 2427 | #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections |
| 2428 | #define elf_backend_fake_sections elf_i386_fake_sections |
| 2429 | #define elf_backend_grok_prstatus elf_i386_grok_prstatus |
| 2430 | #define elf_backend_grok_psinfo elf_i386_grok_psinfo |
| 2431 | #define elf_backend_reloc_type_class elf_i386_reloc_type_class |
| 2432 | |
| 2433 | #include "elf32-target.h" |