| 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 PARAMS ((bfd *, const char *)); |
| 34 | static struct bfd_hash_entry *elf_i386_link_hash_newfunc |
| 35 | PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); |
| 36 | static struct bfd_link_hash_table *elf_i386_link_hash_table_create |
| 37 | PARAMS ((bfd *)); |
| 38 | static boolean create_got_section PARAMS((bfd *, struct bfd_link_info *)); |
| 39 | static boolean elf_i386_create_dynamic_sections |
| 40 | PARAMS((bfd *, struct bfd_link_info *)); |
| 41 | static boolean elf_i386_check_relocs |
| 42 | PARAMS ((bfd *, struct bfd_link_info *, asection *, |
| 43 | const Elf_Internal_Rela *)); |
| 44 | static boolean elf_i386_adjust_dynamic_symbol |
| 45 | PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); |
| 46 | static boolean allocate_plt_and_got_and_discard_relocs |
| 47 | PARAMS ((struct elf_link_hash_entry *, PTR)); |
| 48 | static boolean elf_i386_size_dynamic_sections |
| 49 | PARAMS ((bfd *, struct bfd_link_info *)); |
| 50 | static boolean elf_i386_relocate_section |
| 51 | PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, |
| 52 | Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); |
| 53 | static boolean elf_i386_finish_dynamic_symbol |
| 54 | PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, |
| 55 | Elf_Internal_Sym *)); |
| 56 | static boolean elf_i386_finish_dynamic_sections |
| 57 | PARAMS ((bfd *, struct bfd_link_info *)); |
| 58 | |
| 59 | #define USE_REL 1 /* 386 uses REL relocations instead of RELA */ |
| 60 | |
| 61 | #include "elf/i386.h" |
| 62 | |
| 63 | static reloc_howto_type elf_howto_table[]= |
| 64 | { |
| 65 | HOWTO(R_386_NONE, 0, 0, 0, false, 0, complain_overflow_bitfield, |
| 66 | bfd_elf_generic_reloc, "R_386_NONE", |
| 67 | true, 0x00000000, 0x00000000, false), |
| 68 | HOWTO(R_386_32, 0, 2, 32, false, 0, complain_overflow_bitfield, |
| 69 | bfd_elf_generic_reloc, "R_386_32", |
| 70 | true, 0xffffffff, 0xffffffff, false), |
| 71 | HOWTO(R_386_PC32, 0, 2, 32, true, 0, complain_overflow_bitfield, |
| 72 | bfd_elf_generic_reloc, "R_386_PC32", |
| 73 | true, 0xffffffff, 0xffffffff, true), |
| 74 | HOWTO(R_386_GOT32, 0, 2, 32, false, 0, complain_overflow_bitfield, |
| 75 | bfd_elf_generic_reloc, "R_386_GOT32", |
| 76 | true, 0xffffffff, 0xffffffff, false), |
| 77 | HOWTO(R_386_PLT32, 0, 2, 32, true, 0, complain_overflow_bitfield, |
| 78 | bfd_elf_generic_reloc, "R_386_PLT32", |
| 79 | true, 0xffffffff, 0xffffffff, true), |
| 80 | HOWTO(R_386_COPY, 0, 2, 32, false, 0, complain_overflow_bitfield, |
| 81 | bfd_elf_generic_reloc, "R_386_COPY", |
| 82 | true, 0xffffffff, 0xffffffff, false), |
| 83 | HOWTO(R_386_GLOB_DAT, 0, 2, 32, false, 0, complain_overflow_bitfield, |
| 84 | bfd_elf_generic_reloc, "R_386_GLOB_DAT", |
| 85 | true, 0xffffffff, 0xffffffff, false), |
| 86 | HOWTO(R_386_JUMP_SLOT, 0, 2, 32, false, 0, complain_overflow_bitfield, |
| 87 | bfd_elf_generic_reloc, "R_386_JUMP_SLOT", |
| 88 | true, 0xffffffff, 0xffffffff, false), |
| 89 | HOWTO(R_386_RELATIVE, 0, 2, 32, false, 0, complain_overflow_bitfield, |
| 90 | bfd_elf_generic_reloc, "R_386_RELATIVE", |
| 91 | true, 0xffffffff, 0xffffffff, false), |
| 92 | HOWTO(R_386_GOTOFF, 0, 2, 32, false, 0, complain_overflow_bitfield, |
| 93 | bfd_elf_generic_reloc, "R_386_GOTOFF", |
| 94 | true, 0xffffffff, 0xffffffff, false), |
| 95 | HOWTO(R_386_GOTPC, 0, 2, 32, true, 0, complain_overflow_bitfield, |
| 96 | bfd_elf_generic_reloc, "R_386_GOTPC", |
| 97 | true, 0xffffffff, 0xffffffff, true), |
| 98 | |
| 99 | /* We have a gap in the reloc numbers here. |
| 100 | R_386_standard counts the number up to this point, and |
| 101 | R_386_ext_offset is the value to subtract from a reloc type of |
| 102 | R_386_16 thru R_386_PC8 to form an index into this table. */ |
| 103 | #define R_386_standard ((unsigned int) R_386_GOTPC + 1) |
| 104 | #define R_386_ext_offset ((unsigned int) R_386_16 - R_386_standard) |
| 105 | |
| 106 | /* The remaining relocs are a GNU extension. */ |
| 107 | HOWTO(R_386_16, 0, 1, 16, false, 0, complain_overflow_bitfield, |
| 108 | bfd_elf_generic_reloc, "R_386_16", |
| 109 | true, 0xffff, 0xffff, false), |
| 110 | HOWTO(R_386_PC16, 0, 1, 16, true, 0, complain_overflow_bitfield, |
| 111 | bfd_elf_generic_reloc, "R_386_PC16", |
| 112 | true, 0xffff, 0xffff, true), |
| 113 | HOWTO(R_386_8, 0, 0, 8, false, 0, complain_overflow_bitfield, |
| 114 | bfd_elf_generic_reloc, "R_386_8", |
| 115 | true, 0xff, 0xff, false), |
| 116 | HOWTO(R_386_PC8, 0, 0, 8, true, 0, complain_overflow_signed, |
| 117 | bfd_elf_generic_reloc, "R_386_PC8", |
| 118 | true, 0xff, 0xff, true), |
| 119 | |
| 120 | /* Another gap. */ |
| 121 | #define R_386_ext ((unsigned int) R_386_PC8 + 1 - R_386_ext_offset) |
| 122 | #define R_386_vt_offset ((unsigned int) R_386_GNU_VTINHERIT - R_386_ext) |
| 123 | |
| 124 | /* GNU extension to record C++ vtable hierarchy. */ |
| 125 | HOWTO (R_386_GNU_VTINHERIT, /* type */ |
| 126 | 0, /* rightshift */ |
| 127 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 128 | 0, /* bitsize */ |
| 129 | false, /* pc_relative */ |
| 130 | 0, /* bitpos */ |
| 131 | complain_overflow_dont, /* complain_on_overflow */ |
| 132 | NULL, /* special_function */ |
| 133 | "R_386_GNU_VTINHERIT", /* name */ |
| 134 | false, /* partial_inplace */ |
| 135 | 0, /* src_mask */ |
| 136 | 0, /* dst_mask */ |
| 137 | false), |
| 138 | |
| 139 | /* GNU extension to record C++ vtable member usage. */ |
| 140 | HOWTO (R_386_GNU_VTENTRY, /* type */ |
| 141 | 0, /* rightshift */ |
| 142 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 143 | 0, /* bitsize */ |
| 144 | false, /* pc_relative */ |
| 145 | 0, /* bitpos */ |
| 146 | complain_overflow_dont, /* complain_on_overflow */ |
| 147 | _bfd_elf_rel_vtable_reloc_fn, /* special_function */ |
| 148 | "R_386_GNU_VTENTRY", /* name */ |
| 149 | false, /* partial_inplace */ |
| 150 | 0, /* src_mask */ |
| 151 | 0, /* dst_mask */ |
| 152 | false) |
| 153 | |
| 154 | #define R_386_vt ((unsigned int) R_386_GNU_VTENTRY + 1 - R_386_vt_offset) |
| 155 | |
| 156 | }; |
| 157 | |
| 158 | #ifdef DEBUG_GEN_RELOC |
| 159 | #define TRACE(str) fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str) |
| 160 | #else |
| 161 | #define TRACE(str) |
| 162 | #endif |
| 163 | |
| 164 | static reloc_howto_type * |
| 165 | elf_i386_reloc_type_lookup (abfd, code) |
| 166 | bfd *abfd ATTRIBUTE_UNUSED; |
| 167 | bfd_reloc_code_real_type code; |
| 168 | { |
| 169 | switch (code) |
| 170 | { |
| 171 | case BFD_RELOC_NONE: |
| 172 | TRACE ("BFD_RELOC_NONE"); |
| 173 | return &elf_howto_table[(unsigned int) R_386_NONE ]; |
| 174 | |
| 175 | case BFD_RELOC_32: |
| 176 | TRACE ("BFD_RELOC_32"); |
| 177 | return &elf_howto_table[(unsigned int) R_386_32 ]; |
| 178 | |
| 179 | case BFD_RELOC_CTOR: |
| 180 | TRACE ("BFD_RELOC_CTOR"); |
| 181 | return &elf_howto_table[(unsigned int) R_386_32 ]; |
| 182 | |
| 183 | case BFD_RELOC_32_PCREL: |
| 184 | TRACE ("BFD_RELOC_PC32"); |
| 185 | return &elf_howto_table[(unsigned int) R_386_PC32 ]; |
| 186 | |
| 187 | case BFD_RELOC_386_GOT32: |
| 188 | TRACE ("BFD_RELOC_386_GOT32"); |
| 189 | return &elf_howto_table[(unsigned int) R_386_GOT32 ]; |
| 190 | |
| 191 | case BFD_RELOC_386_PLT32: |
| 192 | TRACE ("BFD_RELOC_386_PLT32"); |
| 193 | return &elf_howto_table[(unsigned int) R_386_PLT32 ]; |
| 194 | |
| 195 | case BFD_RELOC_386_COPY: |
| 196 | TRACE ("BFD_RELOC_386_COPY"); |
| 197 | return &elf_howto_table[(unsigned int) R_386_COPY ]; |
| 198 | |
| 199 | case BFD_RELOC_386_GLOB_DAT: |
| 200 | TRACE ("BFD_RELOC_386_GLOB_DAT"); |
| 201 | return &elf_howto_table[(unsigned int) R_386_GLOB_DAT ]; |
| 202 | |
| 203 | case BFD_RELOC_386_JUMP_SLOT: |
| 204 | TRACE ("BFD_RELOC_386_JUMP_SLOT"); |
| 205 | return &elf_howto_table[(unsigned int) R_386_JUMP_SLOT ]; |
| 206 | |
| 207 | case BFD_RELOC_386_RELATIVE: |
| 208 | TRACE ("BFD_RELOC_386_RELATIVE"); |
| 209 | return &elf_howto_table[(unsigned int) R_386_RELATIVE ]; |
| 210 | |
| 211 | case BFD_RELOC_386_GOTOFF: |
| 212 | TRACE ("BFD_RELOC_386_GOTOFF"); |
| 213 | return &elf_howto_table[(unsigned int) R_386_GOTOFF ]; |
| 214 | |
| 215 | case BFD_RELOC_386_GOTPC: |
| 216 | TRACE ("BFD_RELOC_386_GOTPC"); |
| 217 | return &elf_howto_table[(unsigned int) R_386_GOTPC ]; |
| 218 | |
| 219 | /* The remaining relocs are a GNU extension. */ |
| 220 | case BFD_RELOC_16: |
| 221 | TRACE ("BFD_RELOC_16"); |
| 222 | return &elf_howto_table[(unsigned int) R_386_16 - R_386_ext_offset]; |
| 223 | |
| 224 | case BFD_RELOC_16_PCREL: |
| 225 | TRACE ("BFD_RELOC_16_PCREL"); |
| 226 | return &elf_howto_table[(unsigned int) R_386_PC16 - R_386_ext_offset]; |
| 227 | |
| 228 | case BFD_RELOC_8: |
| 229 | TRACE ("BFD_RELOC_8"); |
| 230 | return &elf_howto_table[(unsigned int) R_386_8 - R_386_ext_offset]; |
| 231 | |
| 232 | case BFD_RELOC_8_PCREL: |
| 233 | TRACE ("BFD_RELOC_8_PCREL"); |
| 234 | return &elf_howto_table[(unsigned int) R_386_PC8 - R_386_ext_offset]; |
| 235 | |
| 236 | case BFD_RELOC_VTABLE_INHERIT: |
| 237 | TRACE ("BFD_RELOC_VTABLE_INHERIT"); |
| 238 | return &elf_howto_table[(unsigned int) R_386_GNU_VTINHERIT |
| 239 | - R_386_vt_offset]; |
| 240 | |
| 241 | case BFD_RELOC_VTABLE_ENTRY: |
| 242 | TRACE ("BFD_RELOC_VTABLE_ENTRY"); |
| 243 | return &elf_howto_table[(unsigned int) R_386_GNU_VTENTRY |
| 244 | - R_386_vt_offset]; |
| 245 | |
| 246 | default: |
| 247 | break; |
| 248 | } |
| 249 | |
| 250 | TRACE ("Unknown"); |
| 251 | return 0; |
| 252 | } |
| 253 | |
| 254 | static void |
| 255 | elf_i386_info_to_howto (abfd, cache_ptr, dst) |
| 256 | bfd *abfd ATTRIBUTE_UNUSED; |
| 257 | arelent *cache_ptr ATTRIBUTE_UNUSED; |
| 258 | Elf32_Internal_Rela *dst ATTRIBUTE_UNUSED; |
| 259 | { |
| 260 | abort (); |
| 261 | } |
| 262 | |
| 263 | static void |
| 264 | elf_i386_info_to_howto_rel (abfd, cache_ptr, dst) |
| 265 | bfd *abfd ATTRIBUTE_UNUSED; |
| 266 | arelent *cache_ptr; |
| 267 | Elf32_Internal_Rel *dst; |
| 268 | { |
| 269 | unsigned int r_type = ELF32_R_TYPE (dst->r_info); |
| 270 | unsigned int indx; |
| 271 | |
| 272 | if ((indx = r_type) >= R_386_standard |
| 273 | && ((indx = r_type - R_386_ext_offset) - R_386_standard |
| 274 | >= R_386_ext - R_386_standard) |
| 275 | && ((indx = r_type - R_386_vt_offset) - R_386_ext |
| 276 | >= R_386_vt - R_386_ext)) |
| 277 | { |
| 278 | (*_bfd_error_handler) (_("%s: invalid relocation type %d"), |
| 279 | bfd_get_filename (abfd), (int) r_type); |
| 280 | indx = (unsigned int) R_386_NONE; |
| 281 | } |
| 282 | cache_ptr->howto = &elf_howto_table[indx]; |
| 283 | } |
| 284 | |
| 285 | /* Return whether a symbol name implies a local label. The UnixWare |
| 286 | 2.1 cc generates temporary symbols that start with .X, so we |
| 287 | recognize them here. FIXME: do other SVR4 compilers also use .X?. |
| 288 | If so, we should move the .X recognition into |
| 289 | _bfd_elf_is_local_label_name. */ |
| 290 | |
| 291 | static boolean |
| 292 | elf_i386_is_local_label_name (abfd, name) |
| 293 | bfd *abfd; |
| 294 | const char *name; |
| 295 | { |
| 296 | if (name[0] == '.' && name[1] == 'X') |
| 297 | return true; |
| 298 | |
| 299 | return _bfd_elf_is_local_label_name (abfd, name); |
| 300 | } |
| 301 | \f |
| 302 | /* Functions for the i386 ELF linker. */ |
| 303 | |
| 304 | /* The name of the dynamic interpreter. This is put in the .interp |
| 305 | section. */ |
| 306 | |
| 307 | #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" |
| 308 | |
| 309 | /* The size in bytes of an entry in the procedure linkage table. */ |
| 310 | |
| 311 | #define PLT_ENTRY_SIZE 16 |
| 312 | |
| 313 | /* The first entry in an absolute procedure linkage table looks like |
| 314 | this. See the SVR4 ABI i386 supplement to see how this works. */ |
| 315 | |
| 316 | static const bfd_byte elf_i386_plt0_entry[PLT_ENTRY_SIZE] = |
| 317 | { |
| 318 | 0xff, 0x35, /* pushl contents of address */ |
| 319 | 0, 0, 0, 0, /* replaced with address of .got + 4. */ |
| 320 | 0xff, 0x25, /* jmp indirect */ |
| 321 | 0, 0, 0, 0, /* replaced with address of .got + 8. */ |
| 322 | 0, 0, 0, 0 /* pad out to 16 bytes. */ |
| 323 | }; |
| 324 | |
| 325 | /* Subsequent entries in an absolute procedure linkage table look like |
| 326 | this. */ |
| 327 | |
| 328 | static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] = |
| 329 | { |
| 330 | 0xff, 0x25, /* jmp indirect */ |
| 331 | 0, 0, 0, 0, /* replaced with address of this symbol in .got. */ |
| 332 | 0x68, /* pushl immediate */ |
| 333 | 0, 0, 0, 0, /* replaced with offset into relocation table. */ |
| 334 | 0xe9, /* jmp relative */ |
| 335 | 0, 0, 0, 0 /* replaced with offset to start of .plt. */ |
| 336 | }; |
| 337 | |
| 338 | /* The first entry in a PIC procedure linkage table look like this. */ |
| 339 | |
| 340 | static const bfd_byte elf_i386_pic_plt0_entry[PLT_ENTRY_SIZE] = |
| 341 | { |
| 342 | 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */ |
| 343 | 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */ |
| 344 | 0, 0, 0, 0 /* pad out to 16 bytes. */ |
| 345 | }; |
| 346 | |
| 347 | /* Subsequent entries in a PIC procedure linkage table look like this. */ |
| 348 | |
| 349 | static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] = |
| 350 | { |
| 351 | 0xff, 0xa3, /* jmp *offset(%ebx) */ |
| 352 | 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ |
| 353 | 0x68, /* pushl immediate */ |
| 354 | 0, 0, 0, 0, /* replaced with offset into relocation table. */ |
| 355 | 0xe9, /* jmp relative */ |
| 356 | 0, 0, 0, 0 /* replaced with offset to start of .plt. */ |
| 357 | }; |
| 358 | |
| 359 | /* The i386 linker needs to keep track of the number of relocs that it |
| 360 | decides to copy as dynamic relocs in check_relocs for each symbol. |
| 361 | This is so that it can later discard them if they are found to be |
| 362 | unnecessary. We store the information in a field extending the |
| 363 | regular ELF linker hash table. */ |
| 364 | |
| 365 | struct elf_i386_dyn_relocs |
| 366 | { |
| 367 | /* Next section. */ |
| 368 | struct elf_i386_dyn_relocs *next; |
| 369 | /* A section in dynobj. */ |
| 370 | asection *section; |
| 371 | /* Number of relocs copied in this section. */ |
| 372 | bfd_size_type count; |
| 373 | }; |
| 374 | |
| 375 | /* i386 ELF linker hash entry. */ |
| 376 | |
| 377 | struct elf_i386_link_hash_entry |
| 378 | { |
| 379 | struct elf_link_hash_entry root; |
| 380 | |
| 381 | /* Number of PC relative relocs copied for this symbol. */ |
| 382 | struct elf_i386_dyn_relocs *dyn_relocs; |
| 383 | }; |
| 384 | |
| 385 | /* i386 ELF linker hash table. */ |
| 386 | |
| 387 | struct elf_i386_link_hash_table |
| 388 | { |
| 389 | struct elf_link_hash_table root; |
| 390 | |
| 391 | /* Short-cuts to get to dynamic linker sections. */ |
| 392 | asection *sgot; |
| 393 | asection *sgotplt; |
| 394 | asection *srelgot; |
| 395 | asection *splt; |
| 396 | asection *srelplt; |
| 397 | asection *sdynbss; |
| 398 | asection *srelbss; |
| 399 | }; |
| 400 | |
| 401 | /* Get the i386 ELF linker hash table from a link_info structure. */ |
| 402 | |
| 403 | #define elf_i386_hash_table(p) \ |
| 404 | ((struct elf_i386_link_hash_table *) ((p)->hash)) |
| 405 | |
| 406 | /* Create an entry in an i386 ELF linker hash table. */ |
| 407 | |
| 408 | static struct bfd_hash_entry * |
| 409 | elf_i386_link_hash_newfunc (entry, table, string) |
| 410 | struct bfd_hash_entry *entry; |
| 411 | struct bfd_hash_table *table; |
| 412 | const char *string; |
| 413 | { |
| 414 | struct elf_i386_link_hash_entry *ret = |
| 415 | (struct elf_i386_link_hash_entry *) entry; |
| 416 | |
| 417 | /* Allocate the structure if it has not already been allocated by a |
| 418 | subclass. */ |
| 419 | if (ret == (struct elf_i386_link_hash_entry *) NULL) |
| 420 | ret = ((struct elf_i386_link_hash_entry *) |
| 421 | bfd_hash_allocate (table, |
| 422 | sizeof (struct elf_i386_link_hash_entry))); |
| 423 | if (ret == (struct elf_i386_link_hash_entry *) NULL) |
| 424 | return (struct bfd_hash_entry *) ret; |
| 425 | |
| 426 | /* Call the allocation method of the superclass. */ |
| 427 | ret = ((struct elf_i386_link_hash_entry *) |
| 428 | _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, |
| 429 | table, string)); |
| 430 | if (ret != (struct elf_i386_link_hash_entry *) NULL) |
| 431 | { |
| 432 | ret->dyn_relocs = NULL; |
| 433 | } |
| 434 | |
| 435 | return (struct bfd_hash_entry *) ret; |
| 436 | } |
| 437 | |
| 438 | /* Create an i386 ELF linker hash table. */ |
| 439 | |
| 440 | static struct bfd_link_hash_table * |
| 441 | elf_i386_link_hash_table_create (abfd) |
| 442 | bfd *abfd; |
| 443 | { |
| 444 | struct elf_i386_link_hash_table *ret; |
| 445 | |
| 446 | ret = ((struct elf_i386_link_hash_table *) |
| 447 | bfd_alloc (abfd, sizeof (struct elf_i386_link_hash_table))); |
| 448 | if (ret == (struct elf_i386_link_hash_table *) NULL) |
| 449 | return NULL; |
| 450 | |
| 451 | if (! _bfd_elf_link_hash_table_init (&ret->root, abfd, |
| 452 | elf_i386_link_hash_newfunc)) |
| 453 | { |
| 454 | bfd_release (abfd, ret); |
| 455 | return NULL; |
| 456 | } |
| 457 | |
| 458 | ret->sgot = NULL; |
| 459 | ret->sgotplt = NULL; |
| 460 | ret->srelgot = NULL; |
| 461 | ret->splt = NULL; |
| 462 | ret->srelplt = NULL; |
| 463 | ret->sdynbss = NULL; |
| 464 | ret->srelbss = NULL; |
| 465 | |
| 466 | return &ret->root.root; |
| 467 | } |
| 468 | |
| 469 | /* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up |
| 470 | shortcuts to them in our hash table. */ |
| 471 | |
| 472 | static boolean |
| 473 | create_got_section (dynobj, info) |
| 474 | bfd *dynobj; |
| 475 | struct bfd_link_info *info; |
| 476 | { |
| 477 | struct elf_i386_link_hash_table *htab; |
| 478 | |
| 479 | if (! _bfd_elf_create_got_section (dynobj, info)) |
| 480 | return false; |
| 481 | |
| 482 | htab = elf_i386_hash_table (info); |
| 483 | htab->sgot = bfd_get_section_by_name (dynobj, ".got"); |
| 484 | htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); |
| 485 | if (!htab->sgot || !htab->sgotplt) |
| 486 | abort (); |
| 487 | |
| 488 | htab->srelgot = bfd_make_section (dynobj, ".rel.got"); |
| 489 | if (htab->srelgot == NULL |
| 490 | || ! bfd_set_section_flags (dynobj, htab->srelgot, |
| 491 | (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS |
| 492 | | SEC_IN_MEMORY | SEC_LINKER_CREATED |
| 493 | | SEC_READONLY)) |
| 494 | || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2)) |
| 495 | return false; |
| 496 | return true; |
| 497 | } |
| 498 | |
| 499 | /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and |
| 500 | .rel.bss sections in DYNOBJ, and set up shortcuts to them in our |
| 501 | hash table. */ |
| 502 | |
| 503 | static boolean |
| 504 | elf_i386_create_dynamic_sections (dynobj, info) |
| 505 | bfd *dynobj; |
| 506 | struct bfd_link_info *info; |
| 507 | { |
| 508 | struct elf_i386_link_hash_table *htab; |
| 509 | |
| 510 | htab = elf_i386_hash_table (info); |
| 511 | if (!htab->sgot && !create_got_section (dynobj, info)) |
| 512 | return false; |
| 513 | |
| 514 | if (!_bfd_elf_create_dynamic_sections (dynobj, info)) |
| 515 | return false; |
| 516 | |
| 517 | htab->splt = bfd_get_section_by_name (dynobj, ".plt"); |
| 518 | htab->srelplt = bfd_get_section_by_name (dynobj, ".rel.plt"); |
| 519 | htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss"); |
| 520 | if (!info->shared) |
| 521 | htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss"); |
| 522 | |
| 523 | if (!htab->splt || !htab->srelplt || !htab->sdynbss |
| 524 | || (!info->shared && !htab->srelbss)) |
| 525 | abort (); |
| 526 | |
| 527 | return true; |
| 528 | } |
| 529 | |
| 530 | /* Look through the relocs for a section during the first phase, and |
| 531 | allocate space in the global offset table or procedure linkage |
| 532 | table. */ |
| 533 | |
| 534 | static boolean |
| 535 | elf_i386_check_relocs (abfd, info, sec, relocs) |
| 536 | bfd *abfd; |
| 537 | struct bfd_link_info *info; |
| 538 | asection *sec; |
| 539 | const Elf_Internal_Rela *relocs; |
| 540 | { |
| 541 | struct elf_i386_link_hash_table *htab; |
| 542 | bfd *dynobj; |
| 543 | Elf_Internal_Shdr *symtab_hdr; |
| 544 | struct elf_link_hash_entry **sym_hashes; |
| 545 | bfd_signed_vma *local_got_refcounts; |
| 546 | const Elf_Internal_Rela *rel; |
| 547 | const Elf_Internal_Rela *rel_end; |
| 548 | asection *sreloc; |
| 549 | |
| 550 | if (info->relocateable) |
| 551 | return true; |
| 552 | |
| 553 | htab = elf_i386_hash_table (info); |
| 554 | dynobj = htab->root.dynobj; |
| 555 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 556 | sym_hashes = elf_sym_hashes (abfd); |
| 557 | local_got_refcounts = elf_local_got_refcounts (abfd); |
| 558 | |
| 559 | sreloc = NULL; |
| 560 | |
| 561 | rel_end = relocs + sec->reloc_count; |
| 562 | for (rel = relocs; rel < rel_end; rel++) |
| 563 | { |
| 564 | unsigned long r_symndx; |
| 565 | struct elf_link_hash_entry *h; |
| 566 | |
| 567 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 568 | |
| 569 | if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) |
| 570 | { |
| 571 | if (abfd->my_archive) |
| 572 | (*_bfd_error_handler) (_("%s(%s): bad symbol index: %d"), |
| 573 | bfd_get_filename (abfd->my_archive), |
| 574 | bfd_get_filename (abfd), |
| 575 | r_symndx); |
| 576 | else |
| 577 | (*_bfd_error_handler) (_("%s: bad symbol index: %d"), |
| 578 | bfd_get_filename (abfd), |
| 579 | r_symndx); |
| 580 | return false; |
| 581 | } |
| 582 | |
| 583 | if (r_symndx < symtab_hdr->sh_info) |
| 584 | h = NULL; |
| 585 | else |
| 586 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 587 | |
| 588 | /* Some relocs require a global offset table. */ |
| 589 | if (htab->sgot == NULL) |
| 590 | { |
| 591 | switch (ELF32_R_TYPE (rel->r_info)) |
| 592 | { |
| 593 | case R_386_GOT32: |
| 594 | case R_386_GOTOFF: |
| 595 | case R_386_GOTPC: |
| 596 | if (dynobj == NULL) |
| 597 | htab->root.dynobj = dynobj = abfd; |
| 598 | if (!create_got_section (dynobj, info)) |
| 599 | return false; |
| 600 | break; |
| 601 | |
| 602 | default: |
| 603 | break; |
| 604 | } |
| 605 | } |
| 606 | |
| 607 | switch (ELF32_R_TYPE (rel->r_info)) |
| 608 | { |
| 609 | case R_386_GOT32: |
| 610 | /* This symbol requires a global offset table entry. */ |
| 611 | if (h != NULL) |
| 612 | { |
| 613 | if (h->got.refcount == -1) |
| 614 | { |
| 615 | /* Make sure this symbol is output as a dynamic symbol. */ |
| 616 | if (h->dynindx == -1) |
| 617 | { |
| 618 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) |
| 619 | return false; |
| 620 | } |
| 621 | h->got.refcount = 1; |
| 622 | } |
| 623 | else |
| 624 | h->got.refcount += 1; |
| 625 | } |
| 626 | else |
| 627 | { |
| 628 | /* This is a global offset table entry for a local symbol. */ |
| 629 | if (local_got_refcounts == NULL) |
| 630 | { |
| 631 | size_t size; |
| 632 | |
| 633 | size = symtab_hdr->sh_info * sizeof (bfd_signed_vma); |
| 634 | local_got_refcounts = ((bfd_signed_vma *) |
| 635 | bfd_alloc (abfd, size)); |
| 636 | if (local_got_refcounts == NULL) |
| 637 | return false; |
| 638 | elf_local_got_refcounts (abfd) = local_got_refcounts; |
| 639 | memset (local_got_refcounts, -1, size); |
| 640 | } |
| 641 | if (local_got_refcounts[r_symndx] == -1) |
| 642 | local_got_refcounts[r_symndx] = 1; |
| 643 | else |
| 644 | local_got_refcounts[r_symndx] += 1; |
| 645 | } |
| 646 | break; |
| 647 | |
| 648 | case R_386_PLT32: |
| 649 | /* This symbol requires a procedure linkage table entry. We |
| 650 | actually build the entry in adjust_dynamic_symbol, |
| 651 | because this might be a case of linking PIC code which is |
| 652 | never referenced by a dynamic object, in which case we |
| 653 | don't need to generate a procedure linkage table entry |
| 654 | after all. */ |
| 655 | |
| 656 | /* If this is a local symbol, we resolve it directly without |
| 657 | creating a procedure linkage table entry. */ |
| 658 | if (h == NULL) |
| 659 | continue; |
| 660 | |
| 661 | if (h->plt.refcount == -1) |
| 662 | { |
| 663 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; |
| 664 | h->plt.refcount = 1; |
| 665 | } |
| 666 | else |
| 667 | h->plt.refcount += 1; |
| 668 | break; |
| 669 | |
| 670 | case R_386_32: |
| 671 | case R_386_PC32: |
| 672 | if (h != NULL && !info->shared) |
| 673 | { |
| 674 | /* If this reloc is in a read-only section, we might |
| 675 | need a copy reloc. */ |
| 676 | if ((sec->flags & SEC_READONLY) != 0) |
| 677 | h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF; |
| 678 | |
| 679 | /* We may need a .plt entry if the function this reloc |
| 680 | refers to is in a shared lib. */ |
| 681 | if (h->plt.refcount == -1) |
| 682 | h->plt.refcount = 1; |
| 683 | else |
| 684 | h->plt.refcount += 1; |
| 685 | } |
| 686 | |
| 687 | /* If we are creating a shared library, and this is a reloc |
| 688 | against a global symbol, or a non PC relative reloc |
| 689 | against a local symbol, then we need to copy the reloc |
| 690 | into the shared library. However, if we are linking with |
| 691 | -Bsymbolic, we do not need to copy a reloc against a |
| 692 | global symbol which is defined in an object we are |
| 693 | including in the link (i.e., DEF_REGULAR is set). At |
| 694 | this point we have not seen all the input files, so it is |
| 695 | possible that DEF_REGULAR is not set now but will be set |
| 696 | later (it is never cleared). In case of a weak definition, |
| 697 | DEF_REGULAR may be cleared later by a strong definition in |
| 698 | a shared library. We account for that possibility below by |
| 699 | storing information in the relocs_copied field of the hash |
| 700 | table entry. A similar situation occurs when creating |
| 701 | shared libraries and symbol visibility changes render the |
| 702 | symbol local. |
| 703 | If on the other hand, we are creating an executable, we |
| 704 | may need to keep relocations for symbols satisfied by a |
| 705 | dynamic library if we manage to avoid copy relocs for the |
| 706 | symbol. */ |
| 707 | if ((info->shared |
| 708 | && (sec->flags & SEC_ALLOC) != 0 |
| 709 | && (ELF32_R_TYPE (rel->r_info) != R_386_PC32 |
| 710 | || (h != NULL |
| 711 | && (! info->symbolic |
| 712 | || h->root.type == bfd_link_hash_defweak |
| 713 | || (h->elf_link_hash_flags |
| 714 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) |
| 715 | || (!info->shared |
| 716 | && (sec->flags & SEC_ALLOC) != 0 |
| 717 | && h != NULL |
| 718 | && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0 |
| 719 | && (h->root.type == bfd_link_hash_defweak |
| 720 | || (h->elf_link_hash_flags |
| 721 | & ELF_LINK_HASH_DEF_REGULAR) == 0))) |
| 722 | { |
| 723 | /* We must copy these reloc types into the output file. |
| 724 | Create a reloc section in dynobj and make room for |
| 725 | this reloc. */ |
| 726 | if (dynobj == NULL) |
| 727 | htab->root.dynobj = dynobj = abfd; |
| 728 | if (sreloc == NULL) |
| 729 | { |
| 730 | const char *name; |
| 731 | |
| 732 | name = (bfd_elf_string_from_elf_section |
| 733 | (abfd, |
| 734 | elf_elfheader (abfd)->e_shstrndx, |
| 735 | elf_section_data (sec)->rel_hdr.sh_name)); |
| 736 | if (name == NULL) |
| 737 | return false; |
| 738 | |
| 739 | if (strncmp (name, ".rel", 4) != 0 |
| 740 | || strcmp (bfd_get_section_name (abfd, sec), |
| 741 | name + 4) != 0) |
| 742 | { |
| 743 | if (abfd->my_archive) |
| 744 | (*_bfd_error_handler) (_("%s(%s): bad relocation section name `%s\'"), |
| 745 | bfd_get_filename (abfd->my_archive), |
| 746 | bfd_get_filename (abfd), |
| 747 | name); |
| 748 | else |
| 749 | (*_bfd_error_handler) (_("%s: bad relocation section name `%s\'"), |
| 750 | bfd_get_filename (abfd), |
| 751 | name); |
| 752 | } |
| 753 | |
| 754 | sreloc = bfd_get_section_by_name (dynobj, name); |
| 755 | if (sreloc == NULL) |
| 756 | { |
| 757 | flagword flags; |
| 758 | |
| 759 | sreloc = bfd_make_section (dynobj, name); |
| 760 | flags = (SEC_HAS_CONTENTS | SEC_READONLY |
| 761 | | SEC_IN_MEMORY | SEC_LINKER_CREATED); |
| 762 | if ((sec->flags & SEC_ALLOC) != 0) |
| 763 | flags |= SEC_ALLOC | SEC_LOAD; |
| 764 | if (sreloc == NULL |
| 765 | || ! bfd_set_section_flags (dynobj, sreloc, flags) |
| 766 | || ! bfd_set_section_alignment (dynobj, sreloc, 2)) |
| 767 | return false; |
| 768 | } |
| 769 | } |
| 770 | |
| 771 | sreloc->_raw_size += sizeof (Elf32_External_Rel); |
| 772 | |
| 773 | /* If this is a global symbol, we count the number of PC |
| 774 | relative relocations we have entered for this symbol, |
| 775 | so that we can discard them later as necessary. Note |
| 776 | that this function is only called if we are using an |
| 777 | elf_i386 linker hash table, which means that h is |
| 778 | really a pointer to an elf_i386_link_hash_entry. */ |
| 779 | if (!info->shared |
| 780 | || (h != NULL |
| 781 | && ELF32_R_TYPE (rel->r_info) == R_386_PC32)) |
| 782 | { |
| 783 | struct elf_i386_link_hash_entry *eh; |
| 784 | struct elf_i386_dyn_relocs *p; |
| 785 | |
| 786 | eh = (struct elf_i386_link_hash_entry *) h; |
| 787 | |
| 788 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 789 | if (p->section == sreloc) |
| 790 | break; |
| 791 | |
| 792 | if (p == NULL) |
| 793 | { |
| 794 | p = ((struct elf_i386_dyn_relocs *) |
| 795 | bfd_alloc (dynobj, sizeof *p)); |
| 796 | if (p == NULL) |
| 797 | return false; |
| 798 | p->next = eh->dyn_relocs; |
| 799 | eh->dyn_relocs = p; |
| 800 | p->section = sreloc; |
| 801 | p->count = 0; |
| 802 | } |
| 803 | |
| 804 | ++p->count; |
| 805 | } |
| 806 | } |
| 807 | |
| 808 | break; |
| 809 | |
| 810 | /* This relocation describes the C++ object vtable hierarchy. |
| 811 | Reconstruct it for later use during GC. */ |
| 812 | case R_386_GNU_VTINHERIT: |
| 813 | if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) |
| 814 | return false; |
| 815 | break; |
| 816 | |
| 817 | /* This relocation describes which C++ vtable entries are actually |
| 818 | used. Record for later use during GC. */ |
| 819 | case R_386_GNU_VTENTRY: |
| 820 | if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_offset)) |
| 821 | return false; |
| 822 | break; |
| 823 | |
| 824 | default: |
| 825 | break; |
| 826 | } |
| 827 | } |
| 828 | |
| 829 | return true; |
| 830 | } |
| 831 | |
| 832 | /* Return the section that should be marked against GC for a given |
| 833 | relocation. */ |
| 834 | |
| 835 | static asection * |
| 836 | elf_i386_gc_mark_hook (abfd, info, rel, h, sym) |
| 837 | bfd *abfd; |
| 838 | struct bfd_link_info *info ATTRIBUTE_UNUSED; |
| 839 | Elf_Internal_Rela *rel; |
| 840 | struct elf_link_hash_entry *h; |
| 841 | Elf_Internal_Sym *sym; |
| 842 | { |
| 843 | if (h != NULL) |
| 844 | { |
| 845 | switch (ELF32_R_TYPE (rel->r_info)) |
| 846 | { |
| 847 | case R_386_GNU_VTINHERIT: |
| 848 | case R_386_GNU_VTENTRY: |
| 849 | break; |
| 850 | |
| 851 | default: |
| 852 | switch (h->root.type) |
| 853 | { |
| 854 | case bfd_link_hash_defined: |
| 855 | case bfd_link_hash_defweak: |
| 856 | return h->root.u.def.section; |
| 857 | |
| 858 | case bfd_link_hash_common: |
| 859 | return h->root.u.c.p->section; |
| 860 | |
| 861 | default: |
| 862 | break; |
| 863 | } |
| 864 | } |
| 865 | } |
| 866 | else |
| 867 | { |
| 868 | if (!(elf_bad_symtab (abfd) |
| 869 | && ELF_ST_BIND (sym->st_info) != STB_LOCAL) |
| 870 | && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE) |
| 871 | && sym->st_shndx != SHN_COMMON)) |
| 872 | { |
| 873 | return bfd_section_from_elf_index (abfd, sym->st_shndx); |
| 874 | } |
| 875 | } |
| 876 | |
| 877 | return NULL; |
| 878 | } |
| 879 | |
| 880 | /* Update the got entry reference counts for the section being removed. */ |
| 881 | |
| 882 | static boolean |
| 883 | elf_i386_gc_sweep_hook (abfd, info, sec, relocs) |
| 884 | bfd *abfd; |
| 885 | struct bfd_link_info *info; |
| 886 | asection *sec; |
| 887 | const Elf_Internal_Rela *relocs; |
| 888 | { |
| 889 | Elf_Internal_Shdr *symtab_hdr; |
| 890 | struct elf_link_hash_entry **sym_hashes; |
| 891 | bfd_signed_vma *local_got_refcounts; |
| 892 | const Elf_Internal_Rela *rel, *relend; |
| 893 | unsigned long r_symndx; |
| 894 | struct elf_link_hash_entry *h; |
| 895 | bfd *dynobj; |
| 896 | |
| 897 | dynobj = elf_hash_table (info)->dynobj; |
| 898 | if (dynobj == NULL) |
| 899 | return true; |
| 900 | |
| 901 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 902 | sym_hashes = elf_sym_hashes (abfd); |
| 903 | local_got_refcounts = elf_local_got_refcounts (abfd); |
| 904 | |
| 905 | relend = relocs + sec->reloc_count; |
| 906 | for (rel = relocs; rel < relend; rel++) |
| 907 | switch (ELF32_R_TYPE (rel->r_info)) |
| 908 | { |
| 909 | case R_386_GOT32: |
| 910 | case R_386_GOTOFF: |
| 911 | case R_386_GOTPC: |
| 912 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 913 | if (r_symndx >= symtab_hdr->sh_info) |
| 914 | { |
| 915 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 916 | if (h->got.refcount > 0) |
| 917 | h->got.refcount -= 1; |
| 918 | } |
| 919 | else if (local_got_refcounts != NULL) |
| 920 | { |
| 921 | if (local_got_refcounts[r_symndx] > 0) |
| 922 | local_got_refcounts[r_symndx] -= 1; |
| 923 | } |
| 924 | break; |
| 925 | |
| 926 | case R_386_32: |
| 927 | case R_386_PC32: |
| 928 | if (info->shared) |
| 929 | break; |
| 930 | /* Fall through. */ |
| 931 | |
| 932 | case R_386_PLT32: |
| 933 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 934 | if (r_symndx >= symtab_hdr->sh_info) |
| 935 | { |
| 936 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 937 | if (h->plt.refcount > 0) |
| 938 | h->plt.refcount -= 1; |
| 939 | } |
| 940 | break; |
| 941 | |
| 942 | default: |
| 943 | break; |
| 944 | } |
| 945 | |
| 946 | return true; |
| 947 | } |
| 948 | |
| 949 | /* Adjust a symbol defined by a dynamic object and referenced by a |
| 950 | regular object. The current definition is in some section of the |
| 951 | dynamic object, but we're not including those sections. We have to |
| 952 | change the definition to something the rest of the link can |
| 953 | understand. */ |
| 954 | |
| 955 | static boolean |
| 956 | elf_i386_adjust_dynamic_symbol (info, h) |
| 957 | struct bfd_link_info *info; |
| 958 | struct elf_link_hash_entry *h; |
| 959 | { |
| 960 | struct elf_i386_link_hash_table *htab; |
| 961 | bfd *dynobj; |
| 962 | asection *s; |
| 963 | unsigned int power_of_two; |
| 964 | |
| 965 | htab = elf_i386_hash_table (info); |
| 966 | dynobj = htab->root.dynobj; |
| 967 | |
| 968 | /* If this is a function, put it in the procedure linkage table. We |
| 969 | will fill in the contents of the procedure linkage table later, |
| 970 | when we know the address of the .got section. */ |
| 971 | if (h->type == STT_FUNC |
| 972 | || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) |
| 973 | { |
| 974 | if (h->plt.refcount <= 0 |
| 975 | || (! info->shared |
| 976 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 |
| 977 | && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0)) |
| 978 | { |
| 979 | /* This case can occur if we saw a PLT32 reloc in an input |
| 980 | file, but the symbol was never referred to by a dynamic |
| 981 | object, or if all references were garbage collected. In |
| 982 | such a case, we don't actually need to build a procedure |
| 983 | linkage table, and we can just do a PC32 reloc instead. */ |
| 984 | h->plt.refcount = (bfd_vma) -1; |
| 985 | h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; |
| 986 | return true; |
| 987 | } |
| 988 | |
| 989 | /* Make sure this symbol is output as a dynamic symbol. */ |
| 990 | if (h->dynindx == -1) |
| 991 | { |
| 992 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) |
| 993 | return false; |
| 994 | } |
| 995 | |
| 996 | return true; |
| 997 | } |
| 998 | else |
| 999 | /* It's possible that we incorrectly decided a .plt reloc was |
| 1000 | needed for an R_386_PC32 reloc to a non-function sym in |
| 1001 | check_relocs. We can't decide accurately between function and |
| 1002 | non-function syms in check-relocs; Objects loaded later in |
| 1003 | the link may change h->type. So fix it now. */ |
| 1004 | h->plt.refcount = (bfd_vma) -1; |
| 1005 | |
| 1006 | /* If this is a weak symbol, and there is a real definition, the |
| 1007 | processor independent code will have arranged for us to see the |
| 1008 | real definition first, and we can just use the same value. */ |
| 1009 | if (h->weakdef != NULL) |
| 1010 | { |
| 1011 | BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined |
| 1012 | || h->weakdef->root.type == bfd_link_hash_defweak); |
| 1013 | h->root.u.def.section = h->weakdef->root.u.def.section; |
| 1014 | h->root.u.def.value = h->weakdef->root.u.def.value; |
| 1015 | return true; |
| 1016 | } |
| 1017 | |
| 1018 | /* This is a reference to a symbol defined by a dynamic object which |
| 1019 | is not a function. */ |
| 1020 | |
| 1021 | /* If we are creating a shared library, we must presume that the |
| 1022 | only references to the symbol are via the global offset table. |
| 1023 | For such cases we need not do anything here; the relocations will |
| 1024 | be handled correctly by relocate_section. */ |
| 1025 | if (info->shared) |
| 1026 | return true; |
| 1027 | |
| 1028 | /* If there are no references to this symbol that do not use the |
| 1029 | GOT, we don't need to generate a copy reloc. */ |
| 1030 | if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0) |
| 1031 | return true; |
| 1032 | |
| 1033 | /* We must allocate the symbol in our .dynbss section, which will |
| 1034 | become part of the .bss section of the executable. There will be |
| 1035 | an entry for this symbol in the .dynsym section. The dynamic |
| 1036 | object will contain position independent code, so all references |
| 1037 | from the dynamic object to this symbol will go through the global |
| 1038 | offset table. The dynamic linker will use the .dynsym entry to |
| 1039 | determine the address it must put in the global offset table, so |
| 1040 | both the dynamic object and the regular object will refer to the |
| 1041 | same memory location for the variable. */ |
| 1042 | |
| 1043 | s = htab->sdynbss; |
| 1044 | if (s == NULL) |
| 1045 | abort (); |
| 1046 | |
| 1047 | /* We must generate a R_386_COPY reloc to tell the dynamic linker to |
| 1048 | copy the initial value out of the dynamic object and into the |
| 1049 | runtime process image. We need to remember the offset into the |
| 1050 | .rel.bss section we are going to use. */ |
| 1051 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) |
| 1052 | { |
| 1053 | asection *srel; |
| 1054 | |
| 1055 | srel = htab->srelbss; |
| 1056 | if (srel == NULL) |
| 1057 | abort (); |
| 1058 | srel->_raw_size += sizeof (Elf32_External_Rel); |
| 1059 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; |
| 1060 | } |
| 1061 | |
| 1062 | /* We need to figure out the alignment required for this symbol. I |
| 1063 | have no idea how ELF linkers handle this. */ |
| 1064 | power_of_two = bfd_log2 (h->size); |
| 1065 | if (power_of_two > 3) |
| 1066 | power_of_two = 3; |
| 1067 | |
| 1068 | /* Apply the required alignment. */ |
| 1069 | s->_raw_size = BFD_ALIGN (s->_raw_size, |
| 1070 | (bfd_size_type) (1 << power_of_two)); |
| 1071 | if (power_of_two > bfd_get_section_alignment (dynobj, s)) |
| 1072 | { |
| 1073 | if (! bfd_set_section_alignment (dynobj, s, power_of_two)) |
| 1074 | return false; |
| 1075 | } |
| 1076 | |
| 1077 | /* Define the symbol as being at this point in the section. */ |
| 1078 | h->root.u.def.section = s; |
| 1079 | h->root.u.def.value = s->_raw_size; |
| 1080 | |
| 1081 | /* Increment the section size to make room for the symbol. */ |
| 1082 | s->_raw_size += h->size; |
| 1083 | |
| 1084 | return true; |
| 1085 | } |
| 1086 | |
| 1087 | /* This is the condition under which elf_i386_finish_dynamic_symbol |
| 1088 | will be called from elflink.h. If elflink.h doesn't call our |
| 1089 | finish_dynamic_symbol routine, we'll need to do something about |
| 1090 | initializing any .plt and .got entries in elf_i386_relocate_section. */ |
| 1091 | #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, INFO, H) \ |
| 1092 | ((DYN) \ |
| 1093 | && ((INFO)->shared \ |
| 1094 | || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \ |
| 1095 | && ((H)->dynindx != -1 \ |
| 1096 | || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)) |
| 1097 | |
| 1098 | /* Allocate space in .plt, .got and associated reloc sections for |
| 1099 | global syms. Also discards space allocated for relocs in the |
| 1100 | check_relocs function that we subsequently have found to be |
| 1101 | unneeded. */ |
| 1102 | |
| 1103 | static boolean |
| 1104 | allocate_plt_and_got_and_discard_relocs (h, inf) |
| 1105 | struct elf_link_hash_entry *h; |
| 1106 | PTR inf; |
| 1107 | { |
| 1108 | struct bfd_link_info *info; |
| 1109 | struct elf_i386_link_hash_table *htab; |
| 1110 | asection *s; |
| 1111 | |
| 1112 | if (h->root.type == bfd_link_hash_indirect |
| 1113 | || h->root.type == bfd_link_hash_warning) |
| 1114 | return true; |
| 1115 | |
| 1116 | info = (struct bfd_link_info *) inf; |
| 1117 | htab = elf_i386_hash_table (info); |
| 1118 | |
| 1119 | if (htab->root.dynamic_sections_created |
| 1120 | && h->plt.refcount > 0) |
| 1121 | { |
| 1122 | s = htab->splt; |
| 1123 | if (s == NULL) |
| 1124 | abort (); |
| 1125 | |
| 1126 | /* If this is the first .plt entry, make room for the special |
| 1127 | first entry. */ |
| 1128 | if (s->_raw_size == 0) |
| 1129 | s->_raw_size += PLT_ENTRY_SIZE; |
| 1130 | |
| 1131 | h->plt.offset = s->_raw_size; |
| 1132 | |
| 1133 | /* If this symbol is not defined in a regular file, and we are |
| 1134 | not generating a shared library, then set the symbol to this |
| 1135 | location in the .plt. This is required to make function |
| 1136 | pointers compare as equal between the normal executable and |
| 1137 | the shared library. */ |
| 1138 | if (! info->shared |
| 1139 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 1140 | { |
| 1141 | h->root.u.def.section = s; |
| 1142 | h->root.u.def.value = h->plt.offset; |
| 1143 | } |
| 1144 | |
| 1145 | /* Make room for this entry. */ |
| 1146 | s->_raw_size += PLT_ENTRY_SIZE; |
| 1147 | |
| 1148 | /* We also need to make an entry in the .got.plt section, which |
| 1149 | will be placed in the .got section by the linker script. */ |
| 1150 | s = htab->sgotplt; |
| 1151 | if (s == NULL) |
| 1152 | abort (); |
| 1153 | s->_raw_size += 4; |
| 1154 | |
| 1155 | if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, info, h)) |
| 1156 | { |
| 1157 | /* We also need to make an entry in the .rel.plt section. */ |
| 1158 | s = htab->srelplt; |
| 1159 | if (s == NULL) |
| 1160 | abort (); |
| 1161 | s->_raw_size += sizeof (Elf32_External_Rel); |
| 1162 | } |
| 1163 | } |
| 1164 | else |
| 1165 | { |
| 1166 | h->plt.offset = (bfd_vma) -1; |
| 1167 | h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; |
| 1168 | } |
| 1169 | |
| 1170 | if (h->got.refcount > 0) |
| 1171 | { |
| 1172 | boolean dyn; |
| 1173 | |
| 1174 | s = htab->sgot; |
| 1175 | h->got.offset = s->_raw_size; |
| 1176 | s->_raw_size += 4; |
| 1177 | dyn = htab->root.dynamic_sections_created; |
| 1178 | if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h)) |
| 1179 | htab->srelgot->_raw_size += sizeof (Elf32_External_Rel); |
| 1180 | } |
| 1181 | else |
| 1182 | h->got.offset = (bfd_vma) -1; |
| 1183 | |
| 1184 | /* In the shared -Bsymbolic case, discard space allocated to copy |
| 1185 | PC relative relocs against symbols which turn out to be defined |
| 1186 | in regular objects. For the normal shared case, discard space |
| 1187 | for relocs that have become local due to symbol visibility |
| 1188 | changes. For the non-shared case, discard space for symbols |
| 1189 | which turn out to need copy relocs or are not dynamic. */ |
| 1190 | |
| 1191 | if ((info->shared |
| 1192 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0 |
| 1193 | && ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0 |
| 1194 | || info->symbolic)) |
| 1195 | || (!info->shared |
| 1196 | && ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) != 0 |
| 1197 | || h->dynindx == -1))) |
| 1198 | { |
| 1199 | struct elf_i386_link_hash_entry *eh; |
| 1200 | struct elf_i386_dyn_relocs *c; |
| 1201 | |
| 1202 | eh = (struct elf_i386_link_hash_entry *) h; |
| 1203 | for (c = eh->dyn_relocs; c != NULL; c = c->next) |
| 1204 | c->section->_raw_size -= c->count * sizeof (Elf32_External_Rel); |
| 1205 | } |
| 1206 | |
| 1207 | return true; |
| 1208 | } |
| 1209 | |
| 1210 | /* Set the sizes of the dynamic sections. */ |
| 1211 | |
| 1212 | static boolean |
| 1213 | elf_i386_size_dynamic_sections (output_bfd, info) |
| 1214 | bfd *output_bfd; |
| 1215 | struct bfd_link_info *info; |
| 1216 | { |
| 1217 | struct elf_i386_link_hash_table *htab; |
| 1218 | bfd *dynobj; |
| 1219 | asection *s; |
| 1220 | boolean relocs; |
| 1221 | boolean reltext; |
| 1222 | bfd *i; |
| 1223 | |
| 1224 | htab = elf_i386_hash_table (info); |
| 1225 | dynobj = htab->root.dynobj; |
| 1226 | if (dynobj == NULL) |
| 1227 | abort (); |
| 1228 | |
| 1229 | if (htab->root.dynamic_sections_created) |
| 1230 | { |
| 1231 | /* Set the contents of the .interp section to the interpreter. */ |
| 1232 | if (! info->shared) |
| 1233 | { |
| 1234 | s = bfd_get_section_by_name (dynobj, ".interp"); |
| 1235 | if (s == NULL) |
| 1236 | abort (); |
| 1237 | s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; |
| 1238 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; |
| 1239 | } |
| 1240 | } |
| 1241 | |
| 1242 | /* Set up .got offsets for local syms. */ |
| 1243 | for (i = info->input_bfds; i; i = i->link_next) |
| 1244 | { |
| 1245 | bfd_signed_vma *local_got; |
| 1246 | bfd_signed_vma *end_local_got; |
| 1247 | bfd_size_type locsymcount; |
| 1248 | Elf_Internal_Shdr *symtab_hdr; |
| 1249 | asection *srel; |
| 1250 | |
| 1251 | if (bfd_get_flavour (i) != bfd_target_elf_flavour) |
| 1252 | continue; |
| 1253 | |
| 1254 | local_got = elf_local_got_refcounts (i); |
| 1255 | if (!local_got) |
| 1256 | continue; |
| 1257 | |
| 1258 | symtab_hdr = &elf_tdata (i)->symtab_hdr; |
| 1259 | locsymcount = symtab_hdr->sh_info; |
| 1260 | end_local_got = local_got + locsymcount; |
| 1261 | s = htab->sgot; |
| 1262 | srel = htab->srelgot; |
| 1263 | for (; local_got < end_local_got; ++local_got) |
| 1264 | { |
| 1265 | if (*local_got > 0) |
| 1266 | { |
| 1267 | *local_got = s->_raw_size; |
| 1268 | s->_raw_size += 4; |
| 1269 | if (info->shared) |
| 1270 | srel->_raw_size += sizeof (Elf32_External_Rel); |
| 1271 | } |
| 1272 | else |
| 1273 | *local_got = (bfd_vma) -1; |
| 1274 | } |
| 1275 | } |
| 1276 | |
| 1277 | /* Allocate global sym .plt and .got entries. Also discard all |
| 1278 | unneeded relocs. */ |
| 1279 | elf_link_hash_traverse (&htab->root, |
| 1280 | allocate_plt_and_got_and_discard_relocs, |
| 1281 | (PTR) info); |
| 1282 | |
| 1283 | /* The check_relocs and adjust_dynamic_symbol entry points have |
| 1284 | determined the sizes of the various dynamic sections. Allocate |
| 1285 | memory for them. */ |
| 1286 | relocs = false; |
| 1287 | reltext = false; |
| 1288 | for (s = dynobj->sections; s != NULL; s = s->next) |
| 1289 | { |
| 1290 | if ((s->flags & SEC_LINKER_CREATED) == 0) |
| 1291 | continue; |
| 1292 | |
| 1293 | if (s == htab->splt |
| 1294 | || s == htab->sgot |
| 1295 | || s == htab->sgotplt) |
| 1296 | { |
| 1297 | /* Strip this section if we don't need it; see the |
| 1298 | comment below. */ |
| 1299 | } |
| 1300 | else if (strncmp (bfd_get_section_name (dynobj, s), ".rel", 4) == 0) |
| 1301 | { |
| 1302 | if (s->_raw_size == 0) |
| 1303 | { |
| 1304 | /* If we don't need this section, strip it from the |
| 1305 | output file. This is mostly to handle .rel.bss and |
| 1306 | .rel.plt. We must create both sections in |
| 1307 | create_dynamic_sections, because they must be created |
| 1308 | before the linker maps input sections to output |
| 1309 | sections. The linker does that before |
| 1310 | adjust_dynamic_symbol is called, and it is that |
| 1311 | function which decides whether anything needs to go |
| 1312 | into these sections. */ |
| 1313 | } |
| 1314 | else |
| 1315 | { |
| 1316 | asection *target; |
| 1317 | |
| 1318 | /* Remember whether there are any reloc sections other |
| 1319 | than .rel.plt. */ |
| 1320 | if (s != htab->srelplt) |
| 1321 | { |
| 1322 | const char *outname; |
| 1323 | |
| 1324 | relocs = true; |
| 1325 | |
| 1326 | /* If this relocation section applies to a read only |
| 1327 | section, then we probably need a DT_TEXTREL |
| 1328 | entry. The entries in the .rel.plt section |
| 1329 | really apply to the .got section, which we |
| 1330 | created ourselves and so know is not readonly. */ |
| 1331 | outname = bfd_get_section_name (output_bfd, |
| 1332 | s->output_section); |
| 1333 | target = bfd_get_section_by_name (output_bfd, outname + 4); |
| 1334 | if (target != NULL |
| 1335 | && (target->flags & SEC_READONLY) != 0 |
| 1336 | && (target->flags & SEC_ALLOC) != 0) |
| 1337 | reltext = true; |
| 1338 | } |
| 1339 | |
| 1340 | /* We use the reloc_count field as a counter if we need |
| 1341 | to copy relocs into the output file. */ |
| 1342 | s->reloc_count = 0; |
| 1343 | } |
| 1344 | } |
| 1345 | else |
| 1346 | { |
| 1347 | /* It's not one of our sections, so don't allocate space. */ |
| 1348 | continue; |
| 1349 | } |
| 1350 | |
| 1351 | if (s->_raw_size == 0) |
| 1352 | { |
| 1353 | _bfd_strip_section_from_output (info, s); |
| 1354 | continue; |
| 1355 | } |
| 1356 | |
| 1357 | /* Allocate memory for the section contents. We use bfd_zalloc |
| 1358 | here in case unused entries are not reclaimed before the |
| 1359 | section's contents are written out. This should not happen, |
| 1360 | but this way if it does, we get a R_386_NONE reloc instead |
| 1361 | of garbage. */ |
| 1362 | s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size); |
| 1363 | if (s->contents == NULL) |
| 1364 | return false; |
| 1365 | } |
| 1366 | |
| 1367 | if (htab->root.dynamic_sections_created) |
| 1368 | { |
| 1369 | /* Add some entries to the .dynamic section. We fill in the |
| 1370 | values later, in elf_i386_finish_dynamic_sections, but we |
| 1371 | must add the entries now so that we get the correct size for |
| 1372 | the .dynamic section. The DT_DEBUG entry is filled in by the |
| 1373 | dynamic linker and used by the debugger. */ |
| 1374 | if (! info->shared) |
| 1375 | { |
| 1376 | if (! bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0)) |
| 1377 | return false; |
| 1378 | } |
| 1379 | |
| 1380 | if (htab->splt->_raw_size != 0) |
| 1381 | { |
| 1382 | if (! bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0) |
| 1383 | || ! bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0) |
| 1384 | || ! bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_REL) |
| 1385 | || ! bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0)) |
| 1386 | return false; |
| 1387 | } |
| 1388 | |
| 1389 | if (relocs) |
| 1390 | { |
| 1391 | if (! bfd_elf32_add_dynamic_entry (info, DT_REL, 0) |
| 1392 | || ! bfd_elf32_add_dynamic_entry (info, DT_RELSZ, 0) |
| 1393 | || ! bfd_elf32_add_dynamic_entry (info, DT_RELENT, |
| 1394 | sizeof (Elf32_External_Rel))) |
| 1395 | return false; |
| 1396 | } |
| 1397 | |
| 1398 | if (reltext) |
| 1399 | { |
| 1400 | if (! bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0)) |
| 1401 | return false; |
| 1402 | info->flags |= DF_TEXTREL; |
| 1403 | } |
| 1404 | } |
| 1405 | |
| 1406 | return true; |
| 1407 | } |
| 1408 | |
| 1409 | /* Relocate an i386 ELF section. */ |
| 1410 | |
| 1411 | static boolean |
| 1412 | elf_i386_relocate_section (output_bfd, info, input_bfd, input_section, |
| 1413 | contents, relocs, local_syms, local_sections) |
| 1414 | bfd *output_bfd; |
| 1415 | struct bfd_link_info *info; |
| 1416 | bfd *input_bfd; |
| 1417 | asection *input_section; |
| 1418 | bfd_byte *contents; |
| 1419 | Elf_Internal_Rela *relocs; |
| 1420 | Elf_Internal_Sym *local_syms; |
| 1421 | asection **local_sections; |
| 1422 | { |
| 1423 | struct elf_i386_link_hash_table *htab; |
| 1424 | bfd *dynobj; |
| 1425 | Elf_Internal_Shdr *symtab_hdr; |
| 1426 | struct elf_link_hash_entry **sym_hashes; |
| 1427 | bfd_vma *local_got_offsets; |
| 1428 | asection *sreloc; |
| 1429 | Elf_Internal_Rela *rel; |
| 1430 | Elf_Internal_Rela *relend; |
| 1431 | |
| 1432 | htab = elf_i386_hash_table (info); |
| 1433 | dynobj = htab->root.dynobj; |
| 1434 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 1435 | sym_hashes = elf_sym_hashes (input_bfd); |
| 1436 | local_got_offsets = elf_local_got_offsets (input_bfd); |
| 1437 | |
| 1438 | sreloc = NULL; |
| 1439 | rel = relocs; |
| 1440 | relend = relocs + input_section->reloc_count; |
| 1441 | for (; rel < relend; rel++) |
| 1442 | { |
| 1443 | int r_type; |
| 1444 | reloc_howto_type *howto; |
| 1445 | unsigned long r_symndx; |
| 1446 | struct elf_link_hash_entry *h; |
| 1447 | Elf_Internal_Sym *sym; |
| 1448 | asection *sec; |
| 1449 | bfd_vma off; |
| 1450 | bfd_vma relocation; |
| 1451 | bfd_reloc_status_type r; |
| 1452 | unsigned int indx; |
| 1453 | |
| 1454 | r_type = ELF32_R_TYPE (rel->r_info); |
| 1455 | if (r_type == (int) R_386_GNU_VTINHERIT |
| 1456 | || r_type == (int) R_386_GNU_VTENTRY) |
| 1457 | continue; |
| 1458 | |
| 1459 | if ((indx = (unsigned) r_type) >= R_386_standard |
| 1460 | && ((indx = (unsigned) r_type - R_386_ext_offset) - R_386_standard |
| 1461 | >= R_386_ext - R_386_standard)) |
| 1462 | { |
| 1463 | bfd_set_error (bfd_error_bad_value); |
| 1464 | return false; |
| 1465 | } |
| 1466 | howto = elf_howto_table + indx; |
| 1467 | |
| 1468 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 1469 | |
| 1470 | if (info->relocateable) |
| 1471 | { |
| 1472 | /* This is a relocateable link. We don't have to change |
| 1473 | anything, unless the reloc is against a section symbol, |
| 1474 | in which case we have to adjust according to where the |
| 1475 | section symbol winds up in the output section. */ |
| 1476 | if (r_symndx < symtab_hdr->sh_info) |
| 1477 | { |
| 1478 | sym = local_syms + r_symndx; |
| 1479 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) |
| 1480 | { |
| 1481 | bfd_vma val; |
| 1482 | |
| 1483 | sec = local_sections[r_symndx]; |
| 1484 | val = bfd_get_32 (input_bfd, contents + rel->r_offset); |
| 1485 | val += sec->output_offset + sym->st_value; |
| 1486 | bfd_put_32 (input_bfd, val, contents + rel->r_offset); |
| 1487 | } |
| 1488 | } |
| 1489 | |
| 1490 | continue; |
| 1491 | } |
| 1492 | |
| 1493 | /* This is a final link. */ |
| 1494 | h = NULL; |
| 1495 | sym = NULL; |
| 1496 | sec = NULL; |
| 1497 | if (r_symndx < symtab_hdr->sh_info) |
| 1498 | { |
| 1499 | sym = local_syms + r_symndx; |
| 1500 | sec = local_sections[r_symndx]; |
| 1501 | relocation = (sec->output_section->vma |
| 1502 | + sec->output_offset |
| 1503 | + sym->st_value); |
| 1504 | } |
| 1505 | else |
| 1506 | { |
| 1507 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 1508 | while (h->root.type == bfd_link_hash_indirect |
| 1509 | || h->root.type == bfd_link_hash_warning) |
| 1510 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1511 | |
| 1512 | relocation = 0; |
| 1513 | if (h->root.type == bfd_link_hash_defined |
| 1514 | || h->root.type == bfd_link_hash_defweak) |
| 1515 | { |
| 1516 | sec = h->root.u.def.section; |
| 1517 | if (r_type == R_386_GOTPC |
| 1518 | || (r_type == R_386_PLT32 |
| 1519 | && htab->splt != NULL |
| 1520 | && h->plt.offset != (bfd_vma) -1) |
| 1521 | || (r_type == R_386_GOT32 |
| 1522 | && (WILL_CALL_FINISH_DYNAMIC_SYMBOL |
| 1523 | (htab->root.dynamic_sections_created, info, h)) |
| 1524 | && !(info->shared |
| 1525 | && (info->symbolic |
| 1526 | || h->dynindx == -1 |
| 1527 | || (h->elf_link_hash_flags |
| 1528 | & ELF_LINK_FORCED_LOCAL)) |
| 1529 | && (h->elf_link_hash_flags |
| 1530 | & ELF_LINK_HASH_DEF_REGULAR))) |
| 1531 | || ((r_type == R_386_32 |
| 1532 | || r_type == R_386_PC32) |
| 1533 | && ((info->shared |
| 1534 | && ((!info->symbolic && h->dynindx != -1) |
| 1535 | || (h->elf_link_hash_flags |
| 1536 | & ELF_LINK_HASH_DEF_REGULAR) == 0)) |
| 1537 | || (!info->shared |
| 1538 | && h->dynindx != -1 |
| 1539 | && (h->elf_link_hash_flags |
| 1540 | & ELF_LINK_NON_GOT_REF) == 0 |
| 1541 | && (h->elf_link_hash_flags |
| 1542 | & ELF_LINK_HASH_DEF_REGULAR) == 0)) |
| 1543 | && ((input_section->flags & SEC_ALLOC) != 0 |
| 1544 | /* DWARF will emit R_386_32 relocations in its |
| 1545 | sections against symbols defined externally |
| 1546 | in shared libraries. We can't do anything |
| 1547 | with them here. */ |
| 1548 | || ((input_section->flags & SEC_DEBUGGING) != 0 |
| 1549 | && (h->elf_link_hash_flags |
| 1550 | & ELF_LINK_HASH_DEF_DYNAMIC) != 0)))) |
| 1551 | /* In these cases, we don't need the relocation |
| 1552 | value. We check specially because in some |
| 1553 | obscure cases sec->output_section will be NULL. */ |
| 1554 | ; |
| 1555 | else if (sec->output_section == NULL) |
| 1556 | (*_bfd_error_handler) |
| 1557 | (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"), |
| 1558 | bfd_get_filename (input_bfd), |
| 1559 | bfd_get_section_name (input_bfd, input_section), |
| 1560 | (long) rel->r_offset, |
| 1561 | h->root.root.string); |
| 1562 | else |
| 1563 | relocation = (h->root.u.def.value |
| 1564 | + sec->output_section->vma |
| 1565 | + sec->output_offset); |
| 1566 | } |
| 1567 | else if (h->root.type == bfd_link_hash_undefweak) |
| 1568 | ; |
| 1569 | else if (info->shared && !info->symbolic |
| 1570 | && !info->no_undefined |
| 1571 | && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) |
| 1572 | ; |
| 1573 | else |
| 1574 | { |
| 1575 | if (! ((*info->callbacks->undefined_symbol) |
| 1576 | (info, h->root.root.string, input_bfd, |
| 1577 | input_section, rel->r_offset, |
| 1578 | (!info->shared || info->no_undefined |
| 1579 | || ELF_ST_VISIBILITY (h->other))))) |
| 1580 | return false; |
| 1581 | } |
| 1582 | } |
| 1583 | |
| 1584 | switch (r_type) |
| 1585 | { |
| 1586 | case R_386_GOT32: |
| 1587 | /* Relocation is to the entry for this symbol in the global |
| 1588 | offset table. */ |
| 1589 | if (htab->sgot == NULL) |
| 1590 | abort (); |
| 1591 | |
| 1592 | if (h != NULL) |
| 1593 | { |
| 1594 | boolean dyn; |
| 1595 | |
| 1596 | off = h->got.offset; |
| 1597 | dyn = htab->root.dynamic_sections_created; |
| 1598 | if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h) |
| 1599 | || (info->shared |
| 1600 | && (info->symbolic |
| 1601 | || h->dynindx == -1 |
| 1602 | || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL)) |
| 1603 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) |
| 1604 | { |
| 1605 | /* This is actually a static link, or it is a |
| 1606 | -Bsymbolic link and the symbol is defined |
| 1607 | locally, or the symbol was forced to be local |
| 1608 | because of a version file. We must initialize |
| 1609 | this entry in the global offset table. Since the |
| 1610 | offset must always be a multiple of 4, we use the |
| 1611 | least significant bit to record whether we have |
| 1612 | initialized it already. |
| 1613 | |
| 1614 | When doing a dynamic link, we create a .rel.got |
| 1615 | relocation entry to initialize the value. This |
| 1616 | is done in the finish_dynamic_symbol routine. */ |
| 1617 | if ((off & 1) != 0) |
| 1618 | off &= ~1; |
| 1619 | else |
| 1620 | { |
| 1621 | bfd_put_32 (output_bfd, relocation, |
| 1622 | htab->sgot->contents + off); |
| 1623 | h->got.offset |= 1; |
| 1624 | } |
| 1625 | } |
| 1626 | } |
| 1627 | else |
| 1628 | { |
| 1629 | if (local_got_offsets == NULL) |
| 1630 | abort (); |
| 1631 | |
| 1632 | off = local_got_offsets[r_symndx]; |
| 1633 | |
| 1634 | /* The offset must always be a multiple of 4. We use |
| 1635 | the least significant bit to record whether we have |
| 1636 | already generated the necessary reloc. */ |
| 1637 | if ((off & 1) != 0) |
| 1638 | off &= ~1; |
| 1639 | else |
| 1640 | { |
| 1641 | bfd_put_32 (output_bfd, relocation, |
| 1642 | htab->sgot->contents + off); |
| 1643 | |
| 1644 | if (info->shared) |
| 1645 | { |
| 1646 | asection *srelgot; |
| 1647 | Elf_Internal_Rel outrel; |
| 1648 | |
| 1649 | srelgot = htab->srelgot; |
| 1650 | if (srelgot == NULL) |
| 1651 | abort (); |
| 1652 | |
| 1653 | outrel.r_offset = (htab->sgot->output_section->vma |
| 1654 | + htab->sgot->output_offset |
| 1655 | + off); |
| 1656 | outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
| 1657 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, |
| 1658 | (((Elf32_External_Rel *) |
| 1659 | srelgot->contents) |
| 1660 | + srelgot->reloc_count)); |
| 1661 | ++srelgot->reloc_count; |
| 1662 | } |
| 1663 | |
| 1664 | local_got_offsets[r_symndx] |= 1; |
| 1665 | } |
| 1666 | } |
| 1667 | |
| 1668 | if (off >= (bfd_vma) -2) |
| 1669 | abort (); |
| 1670 | |
| 1671 | relocation = htab->sgot->output_offset + off; |
| 1672 | break; |
| 1673 | |
| 1674 | case R_386_GOTOFF: |
| 1675 | /* Relocation is relative to the start of the global offset |
| 1676 | table. */ |
| 1677 | |
| 1678 | /* Note that sgot->output_offset is not involved in this |
| 1679 | calculation. We always want the start of .got. If we |
| 1680 | defined _GLOBAL_OFFSET_TABLE in a different way, as is |
| 1681 | permitted by the ABI, we might have to change this |
| 1682 | calculation. */ |
| 1683 | relocation -= htab->sgot->output_section->vma; |
| 1684 | break; |
| 1685 | |
| 1686 | case R_386_GOTPC: |
| 1687 | /* Use global offset table as symbol value. */ |
| 1688 | relocation = htab->sgot->output_section->vma; |
| 1689 | break; |
| 1690 | |
| 1691 | case R_386_PLT32: |
| 1692 | /* Relocation is to the entry for this symbol in the |
| 1693 | procedure linkage table. */ |
| 1694 | |
| 1695 | /* Resolve a PLT32 reloc against a local symbol directly, |
| 1696 | without using the procedure linkage table. */ |
| 1697 | if (h == NULL) |
| 1698 | break; |
| 1699 | |
| 1700 | if (h->plt.offset == (bfd_vma) -1 |
| 1701 | || htab->splt == NULL) |
| 1702 | { |
| 1703 | /* We didn't make a PLT entry for this symbol. This |
| 1704 | happens when statically linking PIC code, or when |
| 1705 | using -Bsymbolic. */ |
| 1706 | break; |
| 1707 | } |
| 1708 | |
| 1709 | relocation = (htab->splt->output_section->vma |
| 1710 | + htab->splt->output_offset |
| 1711 | + h->plt.offset); |
| 1712 | break; |
| 1713 | |
| 1714 | case R_386_32: |
| 1715 | case R_386_PC32: |
| 1716 | if ((info->shared |
| 1717 | && (input_section->flags & SEC_ALLOC) != 0 |
| 1718 | && (r_type != R_386_PC32 |
| 1719 | || (h != NULL |
| 1720 | && h->dynindx != -1 |
| 1721 | && (! info->symbolic |
| 1722 | || (h->elf_link_hash_flags |
| 1723 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) |
| 1724 | || (!info->shared |
| 1725 | && (input_section->flags & SEC_ALLOC) != 0 |
| 1726 | && h != NULL |
| 1727 | && h->dynindx != -1 |
| 1728 | && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0 |
| 1729 | && (h->root.type == bfd_link_hash_defweak |
| 1730 | || (h->elf_link_hash_flags |
| 1731 | & ELF_LINK_HASH_DEF_REGULAR) == 0))) |
| 1732 | { |
| 1733 | Elf_Internal_Rel outrel; |
| 1734 | boolean skip, relocate; |
| 1735 | |
| 1736 | /* When generating a shared object, these relocations |
| 1737 | are copied into the output file to be resolved at run |
| 1738 | time. */ |
| 1739 | |
| 1740 | if (sreloc == NULL) |
| 1741 | { |
| 1742 | const char *name; |
| 1743 | |
| 1744 | name = (bfd_elf_string_from_elf_section |
| 1745 | (input_bfd, |
| 1746 | elf_elfheader (input_bfd)->e_shstrndx, |
| 1747 | elf_section_data (input_section)->rel_hdr.sh_name)); |
| 1748 | if (name == NULL) |
| 1749 | return false; |
| 1750 | |
| 1751 | if (strncmp (name, ".rel", 4) != 0 |
| 1752 | || strcmp (bfd_get_section_name (input_bfd, |
| 1753 | input_section), |
| 1754 | name + 4) != 0) |
| 1755 | { |
| 1756 | if (input_bfd->my_archive) |
| 1757 | (*_bfd_error_handler)\ |
| 1758 | (_("%s(%s): bad relocation section name `%s\'"), |
| 1759 | bfd_get_filename (input_bfd->my_archive), |
| 1760 | bfd_get_filename (input_bfd), |
| 1761 | name); |
| 1762 | else |
| 1763 | (*_bfd_error_handler) |
| 1764 | (_("%s: bad relocation section name `%s\'"), |
| 1765 | bfd_get_filename (input_bfd), |
| 1766 | name); |
| 1767 | return false; |
| 1768 | } |
| 1769 | |
| 1770 | sreloc = bfd_get_section_by_name (dynobj, name); |
| 1771 | if (sreloc == NULL) |
| 1772 | abort (); |
| 1773 | } |
| 1774 | |
| 1775 | skip = false; |
| 1776 | |
| 1777 | if (elf_section_data (input_section)->stab_info == NULL) |
| 1778 | outrel.r_offset = rel->r_offset; |
| 1779 | else |
| 1780 | { |
| 1781 | bfd_vma off; |
| 1782 | |
| 1783 | off = (_bfd_stab_section_offset |
| 1784 | (output_bfd, htab->root.stab_info, input_section, |
| 1785 | &elf_section_data (input_section)->stab_info, |
| 1786 | rel->r_offset)); |
| 1787 | if (off == (bfd_vma) -1) |
| 1788 | skip = true; |
| 1789 | outrel.r_offset = off; |
| 1790 | } |
| 1791 | |
| 1792 | outrel.r_offset += (input_section->output_section->vma |
| 1793 | + input_section->output_offset); |
| 1794 | |
| 1795 | if (skip) |
| 1796 | { |
| 1797 | memset (&outrel, 0, sizeof outrel); |
| 1798 | relocate = false; |
| 1799 | } |
| 1800 | else if (r_type == R_386_PC32) |
| 1801 | { |
| 1802 | BFD_ASSERT (h != NULL && h->dynindx != -1); |
| 1803 | relocate = false; |
| 1804 | outrel.r_info = ELF32_R_INFO (h->dynindx, R_386_PC32); |
| 1805 | } |
| 1806 | else |
| 1807 | { |
| 1808 | /* h->dynindx may be -1 if this symbol was marked to |
| 1809 | become local. */ |
| 1810 | if (h == NULL |
| 1811 | || (info->shared |
| 1812 | && (info->symbolic || h->dynindx == -1) |
| 1813 | && (h->elf_link_hash_flags |
| 1814 | & ELF_LINK_HASH_DEF_REGULAR) != 0)) |
| 1815 | { |
| 1816 | relocate = true; |
| 1817 | outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
| 1818 | } |
| 1819 | else |
| 1820 | { |
| 1821 | BFD_ASSERT (h->dynindx != -1); |
| 1822 | relocate = false; |
| 1823 | outrel.r_info = ELF32_R_INFO (h->dynindx, R_386_32); |
| 1824 | } |
| 1825 | } |
| 1826 | |
| 1827 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, |
| 1828 | (((Elf32_External_Rel *) |
| 1829 | sreloc->contents) |
| 1830 | + sreloc->reloc_count)); |
| 1831 | ++sreloc->reloc_count; |
| 1832 | |
| 1833 | /* If this reloc is against an external symbol, we do |
| 1834 | not want to fiddle with the addend. Otherwise, we |
| 1835 | need to include the symbol value so that it becomes |
| 1836 | an addend for the dynamic reloc. */ |
| 1837 | if (! relocate) |
| 1838 | continue; |
| 1839 | } |
| 1840 | |
| 1841 | break; |
| 1842 | |
| 1843 | default: |
| 1844 | break; |
| 1845 | } |
| 1846 | |
| 1847 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 1848 | contents, rel->r_offset, |
| 1849 | relocation, (bfd_vma) 0); |
| 1850 | |
| 1851 | switch (r) |
| 1852 | { |
| 1853 | case bfd_reloc_ok: |
| 1854 | break; |
| 1855 | |
| 1856 | case bfd_reloc_overflow: |
| 1857 | { |
| 1858 | const char *name; |
| 1859 | |
| 1860 | if (h != NULL) |
| 1861 | name = h->root.root.string; |
| 1862 | else |
| 1863 | { |
| 1864 | name = bfd_elf_string_from_elf_section (input_bfd, |
| 1865 | symtab_hdr->sh_link, |
| 1866 | sym->st_name); |
| 1867 | if (name == NULL) |
| 1868 | return false; |
| 1869 | if (*name == '\0') |
| 1870 | name = bfd_section_name (input_bfd, sec); |
| 1871 | } |
| 1872 | if (! ((*info->callbacks->reloc_overflow) |
| 1873 | (info, name, howto->name, (bfd_vma) 0, |
| 1874 | input_bfd, input_section, rel->r_offset))) |
| 1875 | return false; |
| 1876 | } |
| 1877 | break; |
| 1878 | |
| 1879 | default: |
| 1880 | case bfd_reloc_outofrange: |
| 1881 | abort (); |
| 1882 | break; |
| 1883 | } |
| 1884 | } |
| 1885 | |
| 1886 | return true; |
| 1887 | } |
| 1888 | |
| 1889 | /* Finish up dynamic symbol handling. We set the contents of various |
| 1890 | dynamic sections here. */ |
| 1891 | |
| 1892 | static boolean |
| 1893 | elf_i386_finish_dynamic_symbol (output_bfd, info, h, sym) |
| 1894 | bfd *output_bfd; |
| 1895 | struct bfd_link_info *info; |
| 1896 | struct elf_link_hash_entry *h; |
| 1897 | Elf_Internal_Sym *sym; |
| 1898 | { |
| 1899 | struct elf_i386_link_hash_table *htab; |
| 1900 | bfd *dynobj; |
| 1901 | |
| 1902 | htab = elf_i386_hash_table (info); |
| 1903 | dynobj = htab->root.dynobj; |
| 1904 | |
| 1905 | if (h->plt.offset != (bfd_vma) -1) |
| 1906 | { |
| 1907 | bfd_vma plt_index; |
| 1908 | bfd_vma got_offset; |
| 1909 | Elf_Internal_Rel rel; |
| 1910 | |
| 1911 | /* This symbol has an entry in the procedure linkage table. Set |
| 1912 | it up. */ |
| 1913 | |
| 1914 | if (h->dynindx == -1 |
| 1915 | || htab->splt == NULL |
| 1916 | || htab->sgotplt == NULL |
| 1917 | || htab->srelplt == NULL) |
| 1918 | abort (); |
| 1919 | |
| 1920 | /* Get the index in the procedure linkage table which |
| 1921 | corresponds to this symbol. This is the index of this symbol |
| 1922 | in all the symbols for which we are making plt entries. The |
| 1923 | first entry in the procedure linkage table is reserved. */ |
| 1924 | plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; |
| 1925 | |
| 1926 | /* Get the offset into the .got table of the entry that |
| 1927 | corresponds to this function. Each .got entry is 4 bytes. |
| 1928 | The first three are reserved. */ |
| 1929 | got_offset = (plt_index + 3) * 4; |
| 1930 | |
| 1931 | /* Fill in the entry in the procedure linkage table. */ |
| 1932 | if (! info->shared) |
| 1933 | { |
| 1934 | memcpy (htab->splt->contents + h->plt.offset, elf_i386_plt_entry, |
| 1935 | PLT_ENTRY_SIZE); |
| 1936 | bfd_put_32 (output_bfd, |
| 1937 | (htab->sgotplt->output_section->vma |
| 1938 | + htab->sgotplt->output_offset |
| 1939 | + got_offset), |
| 1940 | htab->splt->contents + h->plt.offset + 2); |
| 1941 | } |
| 1942 | else |
| 1943 | { |
| 1944 | memcpy (htab->splt->contents + h->plt.offset, elf_i386_pic_plt_entry, |
| 1945 | PLT_ENTRY_SIZE); |
| 1946 | bfd_put_32 (output_bfd, got_offset, |
| 1947 | htab->splt->contents + h->plt.offset + 2); |
| 1948 | } |
| 1949 | |
| 1950 | bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel), |
| 1951 | htab->splt->contents + h->plt.offset + 7); |
| 1952 | bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE), |
| 1953 | htab->splt->contents + h->plt.offset + 12); |
| 1954 | |
| 1955 | /* Fill in the entry in the global offset table. */ |
| 1956 | bfd_put_32 (output_bfd, |
| 1957 | (htab->splt->output_section->vma |
| 1958 | + htab->splt->output_offset |
| 1959 | + h->plt.offset |
| 1960 | + 6), |
| 1961 | htab->sgotplt->contents + got_offset); |
| 1962 | |
| 1963 | /* Fill in the entry in the .rel.plt section. */ |
| 1964 | rel.r_offset = (htab->sgotplt->output_section->vma |
| 1965 | + htab->sgotplt->output_offset |
| 1966 | + got_offset); |
| 1967 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT); |
| 1968 | bfd_elf32_swap_reloc_out (output_bfd, &rel, |
| 1969 | ((Elf32_External_Rel *) htab->srelplt->contents |
| 1970 | + plt_index)); |
| 1971 | |
| 1972 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 1973 | { |
| 1974 | /* Mark the symbol as undefined, rather than as defined in |
| 1975 | the .plt section. Leave the value alone. */ |
| 1976 | sym->st_shndx = SHN_UNDEF; |
| 1977 | } |
| 1978 | } |
| 1979 | |
| 1980 | if (h->got.offset != (bfd_vma) -1) |
| 1981 | { |
| 1982 | Elf_Internal_Rel rel; |
| 1983 | |
| 1984 | /* This symbol has an entry in the global offset table. Set it |
| 1985 | up. */ |
| 1986 | |
| 1987 | if (htab->sgot == NULL || htab->srelgot == NULL) |
| 1988 | abort (); |
| 1989 | |
| 1990 | rel.r_offset = (htab->sgot->output_section->vma |
| 1991 | + htab->sgot->output_offset |
| 1992 | + (h->got.offset &~ 1)); |
| 1993 | |
| 1994 | /* If this is a static link, or it is a -Bsymbolic link and the |
| 1995 | symbol is defined locally or was forced to be local because |
| 1996 | of a version file, we just want to emit a RELATIVE reloc. |
| 1997 | The entry in the global offset table will already have been |
| 1998 | initialized in the relocate_section function. */ |
| 1999 | if (info->shared |
| 2000 | && (info->symbolic |
| 2001 | || h->dynindx == -1 |
| 2002 | || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL)) |
| 2003 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) |
| 2004 | { |
| 2005 | BFD_ASSERT((h->got.offset & 1) != 0); |
| 2006 | rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
| 2007 | } |
| 2008 | else |
| 2009 | { |
| 2010 | BFD_ASSERT((h->got.offset & 1) == 0); |
| 2011 | bfd_put_32 (output_bfd, (bfd_vma) 0, |
| 2012 | htab->sgot->contents + h->got.offset); |
| 2013 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT); |
| 2014 | } |
| 2015 | |
| 2016 | bfd_elf32_swap_reloc_out (output_bfd, &rel, |
| 2017 | ((Elf32_External_Rel *) htab->srelgot->contents |
| 2018 | + htab->srelgot->reloc_count)); |
| 2019 | ++htab->srelgot->reloc_count; |
| 2020 | } |
| 2021 | |
| 2022 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) |
| 2023 | { |
| 2024 | Elf_Internal_Rel rel; |
| 2025 | |
| 2026 | /* This symbol needs a copy reloc. Set it up. */ |
| 2027 | |
| 2028 | if (h->dynindx == -1 |
| 2029 | || (h->root.type != bfd_link_hash_defined |
| 2030 | && h->root.type != bfd_link_hash_defweak) |
| 2031 | || htab->srelbss == NULL) |
| 2032 | abort (); |
| 2033 | |
| 2034 | rel.r_offset = (h->root.u.def.value |
| 2035 | + h->root.u.def.section->output_section->vma |
| 2036 | + h->root.u.def.section->output_offset); |
| 2037 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY); |
| 2038 | bfd_elf32_swap_reloc_out (output_bfd, &rel, |
| 2039 | ((Elf32_External_Rel *) htab->srelbss->contents |
| 2040 | + htab->srelbss->reloc_count)); |
| 2041 | ++htab->srelbss->reloc_count; |
| 2042 | } |
| 2043 | |
| 2044 | /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ |
| 2045 | if (strcmp (h->root.root.string, "_DYNAMIC") == 0 |
| 2046 | || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) |
| 2047 | sym->st_shndx = SHN_ABS; |
| 2048 | |
| 2049 | return true; |
| 2050 | } |
| 2051 | |
| 2052 | /* Finish up the dynamic sections. */ |
| 2053 | |
| 2054 | static boolean |
| 2055 | elf_i386_finish_dynamic_sections (output_bfd, info) |
| 2056 | bfd *output_bfd; |
| 2057 | struct bfd_link_info *info; |
| 2058 | { |
| 2059 | struct elf_i386_link_hash_table *htab; |
| 2060 | bfd *dynobj; |
| 2061 | asection *sdyn; |
| 2062 | |
| 2063 | htab = elf_i386_hash_table (info); |
| 2064 | dynobj = htab->root.dynobj; |
| 2065 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); |
| 2066 | |
| 2067 | if (htab->root.dynamic_sections_created) |
| 2068 | { |
| 2069 | Elf32_External_Dyn *dyncon, *dynconend; |
| 2070 | |
| 2071 | if (sdyn == NULL || htab->sgot == NULL) |
| 2072 | abort (); |
| 2073 | |
| 2074 | dyncon = (Elf32_External_Dyn *) sdyn->contents; |
| 2075 | dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size); |
| 2076 | for (; dyncon < dynconend; dyncon++) |
| 2077 | { |
| 2078 | Elf_Internal_Dyn dyn; |
| 2079 | |
| 2080 | bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); |
| 2081 | |
| 2082 | switch (dyn.d_tag) |
| 2083 | { |
| 2084 | default: |
| 2085 | break; |
| 2086 | |
| 2087 | case DT_PLTGOT: |
| 2088 | dyn.d_un.d_ptr = htab->sgot->output_section->vma; |
| 2089 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 2090 | break; |
| 2091 | |
| 2092 | case DT_JMPREL: |
| 2093 | dyn.d_un.d_ptr = htab->srelplt->output_section->vma; |
| 2094 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 2095 | break; |
| 2096 | |
| 2097 | case DT_PLTRELSZ: |
| 2098 | if (htab->srelplt->output_section->_cooked_size != 0) |
| 2099 | dyn.d_un.d_val = htab->srelplt->output_section->_cooked_size; |
| 2100 | else |
| 2101 | dyn.d_un.d_val = htab->srelplt->output_section->_raw_size; |
| 2102 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 2103 | break; |
| 2104 | |
| 2105 | case DT_RELSZ: |
| 2106 | /* My reading of the SVR4 ABI indicates that the |
| 2107 | procedure linkage table relocs (DT_JMPREL) should be |
| 2108 | included in the overall relocs (DT_REL). This is |
| 2109 | what Solaris does. However, UnixWare can not handle |
| 2110 | that case. Therefore, we override the DT_RELSZ entry |
| 2111 | here to make it not include the JMPREL relocs. Since |
| 2112 | the linker script arranges for .rel.plt to follow all |
| 2113 | other relocation sections, we don't have to worry |
| 2114 | about changing the DT_REL entry. */ |
| 2115 | if (htab->srelplt != NULL) |
| 2116 | { |
| 2117 | if (htab->srelplt->output_section->_cooked_size != 0) |
| 2118 | dyn.d_un.d_val -= htab->srelplt->output_section->_cooked_size; |
| 2119 | else |
| 2120 | dyn.d_un.d_val -= htab->srelplt->output_section->_raw_size; |
| 2121 | } |
| 2122 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 2123 | break; |
| 2124 | } |
| 2125 | } |
| 2126 | |
| 2127 | /* Fill in the first entry in the procedure linkage table. */ |
| 2128 | if (htab->splt && htab->splt->_raw_size > 0) |
| 2129 | { |
| 2130 | if (info->shared) |
| 2131 | memcpy (htab->splt->contents, |
| 2132 | elf_i386_pic_plt0_entry, PLT_ENTRY_SIZE); |
| 2133 | else |
| 2134 | { |
| 2135 | memcpy (htab->splt->contents, |
| 2136 | elf_i386_plt0_entry, PLT_ENTRY_SIZE); |
| 2137 | bfd_put_32 (output_bfd, |
| 2138 | (htab->sgotplt->output_section->vma |
| 2139 | + htab->sgotplt->output_offset |
| 2140 | + 4), |
| 2141 | htab->splt->contents + 2); |
| 2142 | bfd_put_32 (output_bfd, |
| 2143 | (htab->sgotplt->output_section->vma |
| 2144 | + htab->sgotplt->output_offset |
| 2145 | + 8), |
| 2146 | htab->splt->contents + 8); |
| 2147 | } |
| 2148 | |
| 2149 | /* UnixWare sets the entsize of .plt to 4, although that doesn't |
| 2150 | really seem like the right value. */ |
| 2151 | elf_section_data (htab->splt->output_section) |
| 2152 | ->this_hdr.sh_entsize = 4; |
| 2153 | } |
| 2154 | } |
| 2155 | |
| 2156 | if (htab->sgotplt) |
| 2157 | { |
| 2158 | /* Fill in the first three entries in the global offset table. */ |
| 2159 | if (htab->sgotplt->_raw_size > 0) |
| 2160 | { |
| 2161 | bfd_put_32 (output_bfd, |
| 2162 | (sdyn == NULL ? (bfd_vma) 0 |
| 2163 | : sdyn->output_section->vma + sdyn->output_offset), |
| 2164 | htab->sgotplt->contents); |
| 2165 | bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 4); |
| 2166 | bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8); |
| 2167 | } |
| 2168 | |
| 2169 | elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = 4; |
| 2170 | } |
| 2171 | return true; |
| 2172 | } |
| 2173 | |
| 2174 | /* Set the correct type for an x86 ELF section. We do this by the |
| 2175 | section name, which is a hack, but ought to work. */ |
| 2176 | |
| 2177 | static boolean |
| 2178 | elf_i386_fake_sections (abfd, hdr, sec) |
| 2179 | bfd *abfd ATTRIBUTE_UNUSED; |
| 2180 | Elf32_Internal_Shdr *hdr; |
| 2181 | asection *sec; |
| 2182 | { |
| 2183 | register const char *name; |
| 2184 | |
| 2185 | name = bfd_get_section_name (abfd, sec); |
| 2186 | |
| 2187 | if (strcmp (name, ".reloc") == 0) |
| 2188 | /* |
| 2189 | * This is an ugly, but unfortunately necessary hack that is |
| 2190 | * needed when producing EFI binaries on x86. It tells |
| 2191 | * elf.c:elf_fake_sections() not to consider ".reloc" as a section |
| 2192 | * containing ELF relocation info. We need this hack in order to |
| 2193 | * be able to generate ELF binaries that can be translated into |
| 2194 | * EFI applications (which are essentially COFF objects). Those |
| 2195 | * files contain a COFF ".reloc" section inside an ELFNN object, |
| 2196 | * which would normally cause BFD to segfault because it would |
| 2197 | * attempt to interpret this section as containing relocation |
| 2198 | * entries for section "oc". With this hack enabled, ".reloc" |
| 2199 | * will be treated as a normal data section, which will avoid the |
| 2200 | * segfault. However, you won't be able to create an ELFNN binary |
| 2201 | * with a section named "oc" that needs relocations, but that's |
| 2202 | * the kind of ugly side-effects you get when detecting section |
| 2203 | * types based on their names... In practice, this limitation is |
| 2204 | * unlikely to bite. |
| 2205 | */ |
| 2206 | hdr->sh_type = SHT_PROGBITS; |
| 2207 | |
| 2208 | return true; |
| 2209 | } |
| 2210 | |
| 2211 | |
| 2212 | #define TARGET_LITTLE_SYM bfd_elf32_i386_vec |
| 2213 | #define TARGET_LITTLE_NAME "elf32-i386" |
| 2214 | #define ELF_ARCH bfd_arch_i386 |
| 2215 | #define ELF_MACHINE_CODE EM_386 |
| 2216 | #define ELF_MAXPAGESIZE 0x1000 |
| 2217 | |
| 2218 | #define elf_backend_can_gc_sections 1 |
| 2219 | #define elf_backend_want_got_plt 1 |
| 2220 | #define elf_backend_plt_readonly 1 |
| 2221 | #define elf_backend_want_plt_sym 0 |
| 2222 | #define elf_backend_got_header_size 12 |
| 2223 | #define elf_backend_plt_header_size PLT_ENTRY_SIZE |
| 2224 | |
| 2225 | #define elf_info_to_howto elf_i386_info_to_howto |
| 2226 | #define elf_info_to_howto_rel elf_i386_info_to_howto_rel |
| 2227 | |
| 2228 | #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name |
| 2229 | #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create |
| 2230 | #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup |
| 2231 | |
| 2232 | #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol |
| 2233 | #define elf_backend_check_relocs elf_i386_check_relocs |
| 2234 | #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections |
| 2235 | #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections |
| 2236 | #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol |
| 2237 | #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook |
| 2238 | #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook |
| 2239 | #define elf_backend_relocate_section elf_i386_relocate_section |
| 2240 | #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections |
| 2241 | #define elf_backend_fake_sections elf_i386_fake_sections |
| 2242 | |
| 2243 | #include "elf32-target.h" |