| 1 | /* Intel 80386/80486-specific support for 32-bit ELF |
| 2 | Copyright 1993, 94-98, 1999 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of BFD, the Binary File Descriptor library. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 19 | |
| 20 | #include "bfd.h" |
| 21 | #include "sysdep.h" |
| 22 | #include "bfdlink.h" |
| 23 | #include "libbfd.h" |
| 24 | #include "elf-bfd.h" |
| 25 | |
| 26 | static reloc_howto_type *elf_i386_reloc_type_lookup |
| 27 | PARAMS ((bfd *, bfd_reloc_code_real_type)); |
| 28 | static void elf_i386_info_to_howto |
| 29 | PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *)); |
| 30 | static void elf_i386_info_to_howto_rel |
| 31 | PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *)); |
| 32 | static boolean elf_i386_is_local_label_name PARAMS ((bfd *, const char *)); |
| 33 | static struct bfd_hash_entry *elf_i386_link_hash_newfunc |
| 34 | PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); |
| 35 | static struct bfd_link_hash_table *elf_i386_link_hash_table_create |
| 36 | PARAMS ((bfd *)); |
| 37 | static boolean elf_i386_check_relocs |
| 38 | PARAMS ((bfd *, struct bfd_link_info *, asection *, |
| 39 | const Elf_Internal_Rela *)); |
| 40 | static boolean elf_i386_adjust_dynamic_symbol |
| 41 | PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); |
| 42 | static boolean elf_i386_size_dynamic_sections |
| 43 | PARAMS ((bfd *, struct bfd_link_info *)); |
| 44 | static boolean elf_i386_relocate_section |
| 45 | PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, |
| 46 | Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); |
| 47 | static boolean elf_i386_finish_dynamic_symbol |
| 48 | PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, |
| 49 | Elf_Internal_Sym *)); |
| 50 | static boolean elf_i386_finish_dynamic_sections |
| 51 | PARAMS ((bfd *, struct bfd_link_info *)); |
| 52 | |
| 53 | #define USE_REL 1 /* 386 uses REL relocations instead of RELA */ |
| 54 | |
| 55 | #include "elf/i386.h" |
| 56 | |
| 57 | static reloc_howto_type elf_howto_table[]= |
| 58 | { |
| 59 | HOWTO(R_386_NONE, 0,0, 0,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_NONE", true,0x00000000,0x00000000,false), |
| 60 | HOWTO(R_386_32, 0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_32", true,0xffffffff,0xffffffff,false), |
| 61 | HOWTO(R_386_PC32, 0,2,32,true, 0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_PC32", true,0xffffffff,0xffffffff,true), |
| 62 | HOWTO(R_386_GOT32, 0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_GOT32", true,0xffffffff,0xffffffff,false), |
| 63 | HOWTO(R_386_PLT32, 0,2,32,true,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_PLT32", true,0xffffffff,0xffffffff,true), |
| 64 | HOWTO(R_386_COPY, 0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_COPY", true,0xffffffff,0xffffffff,false), |
| 65 | HOWTO(R_386_GLOB_DAT, 0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_GLOB_DAT", true,0xffffffff,0xffffffff,false), |
| 66 | HOWTO(R_386_JUMP_SLOT, 0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_JUMP_SLOT",true,0xffffffff,0xffffffff,false), |
| 67 | HOWTO(R_386_RELATIVE, 0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_RELATIVE", true,0xffffffff,0xffffffff,false), |
| 68 | HOWTO(R_386_GOTOFF, 0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_GOTOFF", true,0xffffffff,0xffffffff,false), |
| 69 | HOWTO(R_386_GOTPC, 0,2,32,true,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_GOTPC", true,0xffffffff,0xffffffff,true), |
| 70 | EMPTY_HOWTO (11), |
| 71 | EMPTY_HOWTO (12), |
| 72 | EMPTY_HOWTO (13), |
| 73 | EMPTY_HOWTO (14), |
| 74 | EMPTY_HOWTO (15), |
| 75 | EMPTY_HOWTO (16), |
| 76 | EMPTY_HOWTO (17), |
| 77 | EMPTY_HOWTO (18), |
| 78 | EMPTY_HOWTO (19), |
| 79 | /* The remaining relocs are a GNU extension. */ |
| 80 | HOWTO(R_386_16, 0,1,16,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_16", true,0xffff,0xffff,false), |
| 81 | HOWTO(R_386_PC16, 0,1,16,true, 0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_PC16", true,0xffff,0xffff,true), |
| 82 | HOWTO(R_386_8, 0,0,8,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_8", true,0xff,0xff,false), |
| 83 | HOWTO(R_386_PC8, 0,0,8,true, 0,complain_overflow_signed, bfd_elf_generic_reloc,"R_386_PC8", true,0xff,0xff,true), |
| 84 | }; |
| 85 | |
| 86 | /* GNU extension to record C++ vtable hierarchy. */ |
| 87 | static reloc_howto_type elf32_i386_vtinherit_howto = |
| 88 | HOWTO (R_386_GNU_VTINHERIT, /* type */ |
| 89 | 0, /* rightshift */ |
| 90 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 91 | 0, /* bitsize */ |
| 92 | false, /* pc_relative */ |
| 93 | 0, /* bitpos */ |
| 94 | complain_overflow_dont, /* complain_on_overflow */ |
| 95 | NULL, /* special_function */ |
| 96 | "R_386_GNU_VTINHERIT", /* name */ |
| 97 | false, /* partial_inplace */ |
| 98 | 0, /* src_mask */ |
| 99 | 0, /* dst_mask */ |
| 100 | false); |
| 101 | |
| 102 | /* GNU extension to record C++ vtable member usage. */ |
| 103 | static reloc_howto_type elf32_i386_vtentry_howto = |
| 104 | HOWTO (R_386_GNU_VTENTRY, /* type */ |
| 105 | 0, /* rightshift */ |
| 106 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 107 | 0, /* bitsize */ |
| 108 | false, /* pc_relative */ |
| 109 | 0, /* bitpos */ |
| 110 | complain_overflow_dont, /* complain_on_overflow */ |
| 111 | _bfd_elf_rel_vtable_reloc_fn, /* special_function */ |
| 112 | "R_386_GNU_VTENTRY", /* name */ |
| 113 | false, /* partial_inplace */ |
| 114 | 0, /* src_mask */ |
| 115 | 0, /* dst_mask */ |
| 116 | false); |
| 117 | |
| 118 | #ifdef DEBUG_GEN_RELOC |
| 119 | #define TRACE(str) fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str) |
| 120 | #else |
| 121 | #define TRACE(str) |
| 122 | #endif |
| 123 | |
| 124 | static reloc_howto_type * |
| 125 | elf_i386_reloc_type_lookup (abfd, code) |
| 126 | bfd *abfd ATTRIBUTE_UNUSED; |
| 127 | bfd_reloc_code_real_type code; |
| 128 | { |
| 129 | switch (code) |
| 130 | { |
| 131 | case BFD_RELOC_NONE: |
| 132 | TRACE ("BFD_RELOC_NONE"); |
| 133 | return &elf_howto_table[ (int)R_386_NONE ]; |
| 134 | |
| 135 | case BFD_RELOC_32: |
| 136 | TRACE ("BFD_RELOC_32"); |
| 137 | return &elf_howto_table[ (int)R_386_32 ]; |
| 138 | |
| 139 | case BFD_RELOC_CTOR: |
| 140 | TRACE ("BFD_RELOC_CTOR"); |
| 141 | return &elf_howto_table[ (int)R_386_32 ]; |
| 142 | |
| 143 | case BFD_RELOC_32_PCREL: |
| 144 | TRACE ("BFD_RELOC_PC32"); |
| 145 | return &elf_howto_table[ (int)R_386_PC32 ]; |
| 146 | |
| 147 | case BFD_RELOC_386_GOT32: |
| 148 | TRACE ("BFD_RELOC_386_GOT32"); |
| 149 | return &elf_howto_table[ (int)R_386_GOT32 ]; |
| 150 | |
| 151 | case BFD_RELOC_386_PLT32: |
| 152 | TRACE ("BFD_RELOC_386_PLT32"); |
| 153 | return &elf_howto_table[ (int)R_386_PLT32 ]; |
| 154 | |
| 155 | case BFD_RELOC_386_COPY: |
| 156 | TRACE ("BFD_RELOC_386_COPY"); |
| 157 | return &elf_howto_table[ (int)R_386_COPY ]; |
| 158 | |
| 159 | case BFD_RELOC_386_GLOB_DAT: |
| 160 | TRACE ("BFD_RELOC_386_GLOB_DAT"); |
| 161 | return &elf_howto_table[ (int)R_386_GLOB_DAT ]; |
| 162 | |
| 163 | case BFD_RELOC_386_JUMP_SLOT: |
| 164 | TRACE ("BFD_RELOC_386_JUMP_SLOT"); |
| 165 | return &elf_howto_table[ (int)R_386_JUMP_SLOT ]; |
| 166 | |
| 167 | case BFD_RELOC_386_RELATIVE: |
| 168 | TRACE ("BFD_RELOC_386_RELATIVE"); |
| 169 | return &elf_howto_table[ (int)R_386_RELATIVE ]; |
| 170 | |
| 171 | case BFD_RELOC_386_GOTOFF: |
| 172 | TRACE ("BFD_RELOC_386_GOTOFF"); |
| 173 | return &elf_howto_table[ (int)R_386_GOTOFF ]; |
| 174 | |
| 175 | case BFD_RELOC_386_GOTPC: |
| 176 | TRACE ("BFD_RELOC_386_GOTPC"); |
| 177 | return &elf_howto_table[ (int)R_386_GOTPC ]; |
| 178 | |
| 179 | /* The remaining relocs are a GNU extension. */ |
| 180 | case BFD_RELOC_16: |
| 181 | TRACE ("BFD_RELOC_16"); |
| 182 | return &elf_howto_table[(int) R_386_16]; |
| 183 | |
| 184 | case BFD_RELOC_16_PCREL: |
| 185 | TRACE ("BFD_RELOC_16_PCREL"); |
| 186 | return &elf_howto_table[(int) R_386_PC16]; |
| 187 | |
| 188 | case BFD_RELOC_8: |
| 189 | TRACE ("BFD_RELOC_8"); |
| 190 | return &elf_howto_table[(int) R_386_8]; |
| 191 | |
| 192 | case BFD_RELOC_8_PCREL: |
| 193 | TRACE ("BFD_RELOC_8_PCREL"); |
| 194 | return &elf_howto_table[(int) R_386_PC8]; |
| 195 | |
| 196 | case BFD_RELOC_VTABLE_INHERIT: |
| 197 | TRACE ("BFD_RELOC_VTABLE_INHERIT"); |
| 198 | return &elf32_i386_vtinherit_howto; |
| 199 | |
| 200 | case BFD_RELOC_VTABLE_ENTRY: |
| 201 | TRACE ("BFD_RELOC_VTABLE_ENTRY"); |
| 202 | return &elf32_i386_vtentry_howto; |
| 203 | |
| 204 | default: |
| 205 | break; |
| 206 | } |
| 207 | |
| 208 | TRACE ("Unknown"); |
| 209 | return 0; |
| 210 | } |
| 211 | |
| 212 | static void |
| 213 | elf_i386_info_to_howto (abfd, cache_ptr, dst) |
| 214 | bfd *abfd ATTRIBUTE_UNUSED; |
| 215 | arelent *cache_ptr ATTRIBUTE_UNUSED; |
| 216 | Elf32_Internal_Rela *dst ATTRIBUTE_UNUSED; |
| 217 | { |
| 218 | abort (); |
| 219 | } |
| 220 | |
| 221 | static void |
| 222 | elf_i386_info_to_howto_rel (abfd, cache_ptr, dst) |
| 223 | bfd *abfd ATTRIBUTE_UNUSED; |
| 224 | arelent *cache_ptr; |
| 225 | Elf32_Internal_Rel *dst; |
| 226 | { |
| 227 | enum elf_i386_reloc_type type; |
| 228 | |
| 229 | type = (enum elf_i386_reloc_type) ELF32_R_TYPE (dst->r_info); |
| 230 | if (type == R_386_GNU_VTINHERIT) |
| 231 | cache_ptr->howto = &elf32_i386_vtinherit_howto; |
| 232 | else if (type == R_386_GNU_VTENTRY) |
| 233 | cache_ptr->howto = &elf32_i386_vtentry_howto; |
| 234 | else |
| 235 | { |
| 236 | BFD_ASSERT (type < R_386_max); |
| 237 | BFD_ASSERT (type < FIRST_INVALID_RELOC || type > LAST_INVALID_RELOC); |
| 238 | cache_ptr->howto = &elf_howto_table[(int) type]; |
| 239 | } |
| 240 | } |
| 241 | |
| 242 | /* Return whether a symbol name implies a local label. The UnixWare |
| 243 | 2.1 cc generates temporary symbols that start with .X, so we |
| 244 | recognize them here. FIXME: do other SVR4 compilers also use .X?. |
| 245 | If so, we should move the .X recognition into |
| 246 | _bfd_elf_is_local_label_name. */ |
| 247 | |
| 248 | static boolean |
| 249 | elf_i386_is_local_label_name (abfd, name) |
| 250 | bfd *abfd; |
| 251 | const char *name; |
| 252 | { |
| 253 | if (name[0] == '.' && name[1] == 'X') |
| 254 | return true; |
| 255 | |
| 256 | return _bfd_elf_is_local_label_name (abfd, name); |
| 257 | } |
| 258 | \f |
| 259 | /* Functions for the i386 ELF linker. */ |
| 260 | |
| 261 | /* The name of the dynamic interpreter. This is put in the .interp |
| 262 | section. */ |
| 263 | |
| 264 | #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" |
| 265 | |
| 266 | /* The size in bytes of an entry in the procedure linkage table. */ |
| 267 | |
| 268 | #define PLT_ENTRY_SIZE 16 |
| 269 | |
| 270 | /* The first entry in an absolute procedure linkage table looks like |
| 271 | this. See the SVR4 ABI i386 supplement to see how this works. */ |
| 272 | |
| 273 | static const bfd_byte elf_i386_plt0_entry[PLT_ENTRY_SIZE] = |
| 274 | { |
| 275 | 0xff, 0x35, /* pushl contents of address */ |
| 276 | 0, 0, 0, 0, /* replaced with address of .got + 4. */ |
| 277 | 0xff, 0x25, /* jmp indirect */ |
| 278 | 0, 0, 0, 0, /* replaced with address of .got + 8. */ |
| 279 | 0, 0, 0, 0 /* pad out to 16 bytes. */ |
| 280 | }; |
| 281 | |
| 282 | /* Subsequent entries in an absolute procedure linkage table look like |
| 283 | this. */ |
| 284 | |
| 285 | static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] = |
| 286 | { |
| 287 | 0xff, 0x25, /* jmp indirect */ |
| 288 | 0, 0, 0, 0, /* replaced with address of this symbol in .got. */ |
| 289 | 0x68, /* pushl immediate */ |
| 290 | 0, 0, 0, 0, /* replaced with offset into relocation table. */ |
| 291 | 0xe9, /* jmp relative */ |
| 292 | 0, 0, 0, 0 /* replaced with offset to start of .plt. */ |
| 293 | }; |
| 294 | |
| 295 | /* The first entry in a PIC procedure linkage table look like this. */ |
| 296 | |
| 297 | static const bfd_byte elf_i386_pic_plt0_entry[PLT_ENTRY_SIZE] = |
| 298 | { |
| 299 | 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */ |
| 300 | 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */ |
| 301 | 0, 0, 0, 0 /* pad out to 16 bytes. */ |
| 302 | }; |
| 303 | |
| 304 | /* Subsequent entries in a PIC procedure linkage table look like this. */ |
| 305 | |
| 306 | static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] = |
| 307 | { |
| 308 | 0xff, 0xa3, /* jmp *offset(%ebx) */ |
| 309 | 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ |
| 310 | 0x68, /* pushl immediate */ |
| 311 | 0, 0, 0, 0, /* replaced with offset into relocation table. */ |
| 312 | 0xe9, /* jmp relative */ |
| 313 | 0, 0, 0, 0 /* replaced with offset to start of .plt. */ |
| 314 | }; |
| 315 | |
| 316 | /* The i386 linker needs to keep track of the number of relocs that it |
| 317 | decides to copy in check_relocs for each symbol. This is so that |
| 318 | it can discard PC relative relocs if it doesn't need them when |
| 319 | linking with -Bsymbolic. We store the information in a field |
| 320 | extending the regular ELF linker hash table. */ |
| 321 | |
| 322 | /* This structure keeps track of the number of PC relative relocs we |
| 323 | have copied for a given symbol. */ |
| 324 | |
| 325 | struct elf_i386_pcrel_relocs_copied |
| 326 | { |
| 327 | /* Next section. */ |
| 328 | struct elf_i386_pcrel_relocs_copied *next; |
| 329 | /* A section in dynobj. */ |
| 330 | asection *section; |
| 331 | /* Number of relocs copied in this section. */ |
| 332 | bfd_size_type count; |
| 333 | }; |
| 334 | |
| 335 | /* i386 ELF linker hash entry. */ |
| 336 | |
| 337 | struct elf_i386_link_hash_entry |
| 338 | { |
| 339 | struct elf_link_hash_entry root; |
| 340 | |
| 341 | /* Number of PC relative relocs copied for this symbol. */ |
| 342 | struct elf_i386_pcrel_relocs_copied *pcrel_relocs_copied; |
| 343 | }; |
| 344 | |
| 345 | /* i386 ELF linker hash table. */ |
| 346 | |
| 347 | struct elf_i386_link_hash_table |
| 348 | { |
| 349 | struct elf_link_hash_table root; |
| 350 | }; |
| 351 | |
| 352 | /* Declare this now that the above structures are defined. */ |
| 353 | |
| 354 | static boolean elf_i386_discard_copies |
| 355 | PARAMS ((struct elf_i386_link_hash_entry *, PTR)); |
| 356 | |
| 357 | /* Traverse an i386 ELF linker hash table. */ |
| 358 | |
| 359 | #define elf_i386_link_hash_traverse(table, func, info) \ |
| 360 | (elf_link_hash_traverse \ |
| 361 | (&(table)->root, \ |
| 362 | (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \ |
| 363 | (info))) |
| 364 | |
| 365 | /* Get the i386 ELF linker hash table from a link_info structure. */ |
| 366 | |
| 367 | #define elf_i386_hash_table(p) \ |
| 368 | ((struct elf_i386_link_hash_table *) ((p)->hash)) |
| 369 | |
| 370 | /* Create an entry in an i386 ELF linker hash table. */ |
| 371 | |
| 372 | static struct bfd_hash_entry * |
| 373 | elf_i386_link_hash_newfunc (entry, table, string) |
| 374 | struct bfd_hash_entry *entry; |
| 375 | struct bfd_hash_table *table; |
| 376 | const char *string; |
| 377 | { |
| 378 | struct elf_i386_link_hash_entry *ret = |
| 379 | (struct elf_i386_link_hash_entry *) entry; |
| 380 | |
| 381 | /* Allocate the structure if it has not already been allocated by a |
| 382 | subclass. */ |
| 383 | if (ret == (struct elf_i386_link_hash_entry *) NULL) |
| 384 | ret = ((struct elf_i386_link_hash_entry *) |
| 385 | bfd_hash_allocate (table, |
| 386 | sizeof (struct elf_i386_link_hash_entry))); |
| 387 | if (ret == (struct elf_i386_link_hash_entry *) NULL) |
| 388 | return (struct bfd_hash_entry *) ret; |
| 389 | |
| 390 | /* Call the allocation method of the superclass. */ |
| 391 | ret = ((struct elf_i386_link_hash_entry *) |
| 392 | _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, |
| 393 | table, string)); |
| 394 | if (ret != (struct elf_i386_link_hash_entry *) NULL) |
| 395 | { |
| 396 | ret->pcrel_relocs_copied = NULL; |
| 397 | } |
| 398 | |
| 399 | return (struct bfd_hash_entry *) ret; |
| 400 | } |
| 401 | |
| 402 | /* Create an i386 ELF linker hash table. */ |
| 403 | |
| 404 | static struct bfd_link_hash_table * |
| 405 | elf_i386_link_hash_table_create (abfd) |
| 406 | bfd *abfd; |
| 407 | { |
| 408 | struct elf_i386_link_hash_table *ret; |
| 409 | |
| 410 | ret = ((struct elf_i386_link_hash_table *) |
| 411 | bfd_alloc (abfd, sizeof (struct elf_i386_link_hash_table))); |
| 412 | if (ret == (struct elf_i386_link_hash_table *) NULL) |
| 413 | return NULL; |
| 414 | |
| 415 | if (! _bfd_elf_link_hash_table_init (&ret->root, abfd, |
| 416 | elf_i386_link_hash_newfunc)) |
| 417 | { |
| 418 | bfd_release (abfd, ret); |
| 419 | return NULL; |
| 420 | } |
| 421 | |
| 422 | return &ret->root.root; |
| 423 | } |
| 424 | |
| 425 | /* Look through the relocs for a section during the first phase, and |
| 426 | allocate space in the global offset table or procedure linkage |
| 427 | table. */ |
| 428 | |
| 429 | static boolean |
| 430 | elf_i386_check_relocs (abfd, info, sec, relocs) |
| 431 | bfd *abfd; |
| 432 | struct bfd_link_info *info; |
| 433 | asection *sec; |
| 434 | const Elf_Internal_Rela *relocs; |
| 435 | { |
| 436 | bfd *dynobj; |
| 437 | Elf_Internal_Shdr *symtab_hdr; |
| 438 | struct elf_link_hash_entry **sym_hashes; |
| 439 | bfd_vma *local_got_offsets; |
| 440 | const Elf_Internal_Rela *rel; |
| 441 | const Elf_Internal_Rela *rel_end; |
| 442 | asection *sgot; |
| 443 | asection *srelgot; |
| 444 | asection *sreloc; |
| 445 | |
| 446 | if (info->relocateable) |
| 447 | return true; |
| 448 | |
| 449 | dynobj = elf_hash_table (info)->dynobj; |
| 450 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 451 | sym_hashes = elf_sym_hashes (abfd); |
| 452 | local_got_offsets = elf_local_got_offsets (abfd); |
| 453 | |
| 454 | sgot = NULL; |
| 455 | srelgot = NULL; |
| 456 | sreloc = NULL; |
| 457 | |
| 458 | rel_end = relocs + sec->reloc_count; |
| 459 | for (rel = relocs; rel < rel_end; rel++) |
| 460 | { |
| 461 | unsigned long r_symndx; |
| 462 | struct elf_link_hash_entry *h; |
| 463 | |
| 464 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 465 | |
| 466 | if (r_symndx < symtab_hdr->sh_info) |
| 467 | h = NULL; |
| 468 | else |
| 469 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 470 | |
| 471 | /* Some relocs require a global offset table. */ |
| 472 | if (dynobj == NULL) |
| 473 | { |
| 474 | switch (ELF32_R_TYPE (rel->r_info)) |
| 475 | { |
| 476 | case R_386_GOT32: |
| 477 | case R_386_GOTOFF: |
| 478 | case R_386_GOTPC: |
| 479 | elf_hash_table (info)->dynobj = dynobj = abfd; |
| 480 | if (! _bfd_elf_create_got_section (dynobj, info)) |
| 481 | return false; |
| 482 | break; |
| 483 | |
| 484 | default: |
| 485 | break; |
| 486 | } |
| 487 | } |
| 488 | |
| 489 | switch (ELF32_R_TYPE (rel->r_info)) |
| 490 | { |
| 491 | case R_386_GOT32: |
| 492 | /* This symbol requires a global offset table entry. */ |
| 493 | |
| 494 | if (sgot == NULL) |
| 495 | { |
| 496 | sgot = bfd_get_section_by_name (dynobj, ".got"); |
| 497 | BFD_ASSERT (sgot != NULL); |
| 498 | } |
| 499 | |
| 500 | if (srelgot == NULL |
| 501 | && (h != NULL || info->shared)) |
| 502 | { |
| 503 | srelgot = bfd_get_section_by_name (dynobj, ".rel.got"); |
| 504 | if (srelgot == NULL) |
| 505 | { |
| 506 | srelgot = bfd_make_section (dynobj, ".rel.got"); |
| 507 | if (srelgot == NULL |
| 508 | || ! bfd_set_section_flags (dynobj, srelgot, |
| 509 | (SEC_ALLOC |
| 510 | | SEC_LOAD |
| 511 | | SEC_HAS_CONTENTS |
| 512 | | SEC_IN_MEMORY |
| 513 | | SEC_LINKER_CREATED |
| 514 | | SEC_READONLY)) |
| 515 | || ! bfd_set_section_alignment (dynobj, srelgot, 2)) |
| 516 | return false; |
| 517 | } |
| 518 | } |
| 519 | |
| 520 | if (h != NULL) |
| 521 | { |
| 522 | if (h->got.offset != (bfd_vma) -1) |
| 523 | { |
| 524 | /* We have already allocated space in the .got. */ |
| 525 | break; |
| 526 | } |
| 527 | h->got.offset = sgot->_raw_size; |
| 528 | |
| 529 | /* Make sure this symbol is output as a dynamic symbol. */ |
| 530 | if (h->dynindx == -1) |
| 531 | { |
| 532 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) |
| 533 | return false; |
| 534 | } |
| 535 | |
| 536 | srelgot->_raw_size += sizeof (Elf32_External_Rel); |
| 537 | } |
| 538 | else |
| 539 | { |
| 540 | /* This is a global offset table entry for a local |
| 541 | symbol. */ |
| 542 | if (local_got_offsets == NULL) |
| 543 | { |
| 544 | size_t size; |
| 545 | register unsigned int i; |
| 546 | |
| 547 | size = symtab_hdr->sh_info * sizeof (bfd_vma); |
| 548 | local_got_offsets = (bfd_vma *) bfd_alloc (abfd, size); |
| 549 | if (local_got_offsets == NULL) |
| 550 | return false; |
| 551 | elf_local_got_offsets (abfd) = local_got_offsets; |
| 552 | for (i = 0; i < symtab_hdr->sh_info; i++) |
| 553 | local_got_offsets[i] = (bfd_vma) -1; |
| 554 | } |
| 555 | if (local_got_offsets[r_symndx] != (bfd_vma) -1) |
| 556 | { |
| 557 | /* We have already allocated space in the .got. */ |
| 558 | break; |
| 559 | } |
| 560 | local_got_offsets[r_symndx] = sgot->_raw_size; |
| 561 | |
| 562 | if (info->shared) |
| 563 | { |
| 564 | /* If we are generating a shared object, we need to |
| 565 | output a R_386_RELATIVE reloc so that the dynamic |
| 566 | linker can adjust this GOT entry. */ |
| 567 | srelgot->_raw_size += sizeof (Elf32_External_Rel); |
| 568 | } |
| 569 | } |
| 570 | |
| 571 | sgot->_raw_size += 4; |
| 572 | |
| 573 | break; |
| 574 | |
| 575 | case R_386_PLT32: |
| 576 | /* This symbol requires a procedure linkage table entry. We |
| 577 | actually build the entry in adjust_dynamic_symbol, |
| 578 | because this might be a case of linking PIC code which is |
| 579 | never referenced by a dynamic object, in which case we |
| 580 | don't need to generate a procedure linkage table entry |
| 581 | after all. */ |
| 582 | |
| 583 | /* If this is a local symbol, we resolve it directly without |
| 584 | creating a procedure linkage table entry. */ |
| 585 | if (h == NULL) |
| 586 | continue; |
| 587 | |
| 588 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; |
| 589 | |
| 590 | break; |
| 591 | |
| 592 | case R_386_32: |
| 593 | case R_386_PC32: |
| 594 | if (h != NULL) |
| 595 | h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF; |
| 596 | |
| 597 | /* If we are creating a shared library, and this is a reloc |
| 598 | against a global symbol, or a non PC relative reloc |
| 599 | against a local symbol, then we need to copy the reloc |
| 600 | into the shared library. However, if we are linking with |
| 601 | -Bsymbolic, we do not need to copy a reloc against a |
| 602 | global symbol which is defined in an object we are |
| 603 | including in the link (i.e., DEF_REGULAR is set). At |
| 604 | this point we have not seen all the input files, so it is |
| 605 | possible that DEF_REGULAR is not set now but will be set |
| 606 | later (it is never cleared). We account for that |
| 607 | possibility below by storing information in the |
| 608 | pcrel_relocs_copied field of the hash table entry. */ |
| 609 | if (info->shared |
| 610 | && (sec->flags & SEC_ALLOC) != 0 |
| 611 | && (ELF32_R_TYPE (rel->r_info) != R_386_PC32 |
| 612 | || (h != NULL |
| 613 | && (! info->symbolic |
| 614 | || (h->elf_link_hash_flags |
| 615 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) |
| 616 | { |
| 617 | /* When creating a shared object, we must copy these |
| 618 | reloc types into the output file. We create a reloc |
| 619 | section in dynobj and make room for this reloc. */ |
| 620 | if (sreloc == NULL) |
| 621 | { |
| 622 | const char *name; |
| 623 | |
| 624 | name = (bfd_elf_string_from_elf_section |
| 625 | (abfd, |
| 626 | elf_elfheader (abfd)->e_shstrndx, |
| 627 | elf_section_data (sec)->rel_hdr.sh_name)); |
| 628 | if (name == NULL) |
| 629 | return false; |
| 630 | |
| 631 | BFD_ASSERT (strncmp (name, ".rel", 4) == 0 |
| 632 | && strcmp (bfd_get_section_name (abfd, sec), |
| 633 | name + 4) == 0); |
| 634 | |
| 635 | sreloc = bfd_get_section_by_name (dynobj, name); |
| 636 | if (sreloc == NULL) |
| 637 | { |
| 638 | flagword flags; |
| 639 | |
| 640 | sreloc = bfd_make_section (dynobj, name); |
| 641 | flags = (SEC_HAS_CONTENTS | SEC_READONLY |
| 642 | | SEC_IN_MEMORY | SEC_LINKER_CREATED); |
| 643 | if ((sec->flags & SEC_ALLOC) != 0) |
| 644 | flags |= SEC_ALLOC | SEC_LOAD; |
| 645 | if (sreloc == NULL |
| 646 | || ! bfd_set_section_flags (dynobj, sreloc, flags) |
| 647 | || ! bfd_set_section_alignment (dynobj, sreloc, 2)) |
| 648 | return false; |
| 649 | } |
| 650 | } |
| 651 | |
| 652 | sreloc->_raw_size += sizeof (Elf32_External_Rel); |
| 653 | |
| 654 | /* If we are linking with -Bsymbolic, and this is a |
| 655 | global symbol, we count the number of PC relative |
| 656 | relocations we have entered for this symbol, so that |
| 657 | we can discard them again if the symbol is later |
| 658 | defined by a regular object. Note that this function |
| 659 | is only called if we are using an elf_i386 linker |
| 660 | hash table, which means that h is really a pointer to |
| 661 | an elf_i386_link_hash_entry. */ |
| 662 | if (h != NULL && info->symbolic |
| 663 | && ELF32_R_TYPE (rel->r_info) == R_386_PC32) |
| 664 | { |
| 665 | struct elf_i386_link_hash_entry *eh; |
| 666 | struct elf_i386_pcrel_relocs_copied *p; |
| 667 | |
| 668 | eh = (struct elf_i386_link_hash_entry *) h; |
| 669 | |
| 670 | for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next) |
| 671 | if (p->section == sreloc) |
| 672 | break; |
| 673 | |
| 674 | if (p == NULL) |
| 675 | { |
| 676 | p = ((struct elf_i386_pcrel_relocs_copied *) |
| 677 | bfd_alloc (dynobj, sizeof *p)); |
| 678 | if (p == NULL) |
| 679 | return false; |
| 680 | p->next = eh->pcrel_relocs_copied; |
| 681 | eh->pcrel_relocs_copied = p; |
| 682 | p->section = sreloc; |
| 683 | p->count = 0; |
| 684 | } |
| 685 | |
| 686 | ++p->count; |
| 687 | } |
| 688 | } |
| 689 | |
| 690 | break; |
| 691 | |
| 692 | /* This relocation describes the C++ object vtable hierarchy. |
| 693 | Reconstruct it for later use during GC. */ |
| 694 | case R_386_GNU_VTINHERIT: |
| 695 | if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) |
| 696 | return false; |
| 697 | break; |
| 698 | |
| 699 | /* This relocation describes which C++ vtable entries are actually |
| 700 | used. Record for later use during GC. */ |
| 701 | case R_386_GNU_VTENTRY: |
| 702 | if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_offset)) |
| 703 | return false; |
| 704 | break; |
| 705 | |
| 706 | default: |
| 707 | break; |
| 708 | } |
| 709 | } |
| 710 | |
| 711 | return true; |
| 712 | } |
| 713 | |
| 714 | /* Return the section that should be marked against GC for a given |
| 715 | relocation. */ |
| 716 | |
| 717 | static asection * |
| 718 | elf_i386_gc_mark_hook (abfd, info, rel, h, sym) |
| 719 | bfd *abfd; |
| 720 | struct bfd_link_info *info ATTRIBUTE_UNUSED; |
| 721 | Elf_Internal_Rela *rel; |
| 722 | struct elf_link_hash_entry *h; |
| 723 | Elf_Internal_Sym *sym; |
| 724 | { |
| 725 | if (h != NULL) |
| 726 | { |
| 727 | switch (ELF32_R_TYPE (rel->r_info)) |
| 728 | { |
| 729 | case R_386_GNU_VTINHERIT: |
| 730 | case R_386_GNU_VTENTRY: |
| 731 | break; |
| 732 | |
| 733 | default: |
| 734 | switch (h->root.type) |
| 735 | { |
| 736 | case bfd_link_hash_defined: |
| 737 | case bfd_link_hash_defweak: |
| 738 | return h->root.u.def.section; |
| 739 | |
| 740 | case bfd_link_hash_common: |
| 741 | return h->root.u.c.p->section; |
| 742 | |
| 743 | default: |
| 744 | break; |
| 745 | } |
| 746 | } |
| 747 | } |
| 748 | else |
| 749 | { |
| 750 | if (!(elf_bad_symtab (abfd) |
| 751 | && ELF_ST_BIND (sym->st_info) != STB_LOCAL) |
| 752 | && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE) |
| 753 | && sym->st_shndx != SHN_COMMON)) |
| 754 | { |
| 755 | return bfd_section_from_elf_index (abfd, sym->st_shndx); |
| 756 | } |
| 757 | } |
| 758 | |
| 759 | return NULL; |
| 760 | } |
| 761 | |
| 762 | /* Update the got entry reference counts for the section being removed. */ |
| 763 | |
| 764 | static boolean |
| 765 | elf_i386_gc_sweep_hook (abfd, info, sec, relocs) |
| 766 | bfd *abfd ATTRIBUTE_UNUSED; |
| 767 | struct bfd_link_info *info ATTRIBUTE_UNUSED; |
| 768 | asection *sec ATTRIBUTE_UNUSED; |
| 769 | const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED; |
| 770 | { |
| 771 | /* ??? It would seem that the existing i386 code does no sort |
| 772 | of reference counting or whatnot on its GOT and PLT entries, |
| 773 | so it is not possible to garbage collect them at this time. */ |
| 774 | |
| 775 | return true; |
| 776 | } |
| 777 | |
| 778 | /* Adjust a symbol defined by a dynamic object and referenced by a |
| 779 | regular object. The current definition is in some section of the |
| 780 | dynamic object, but we're not including those sections. We have to |
| 781 | change the definition to something the rest of the link can |
| 782 | understand. */ |
| 783 | |
| 784 | static boolean |
| 785 | elf_i386_adjust_dynamic_symbol (info, h) |
| 786 | struct bfd_link_info *info; |
| 787 | struct elf_link_hash_entry *h; |
| 788 | { |
| 789 | bfd *dynobj; |
| 790 | asection *s; |
| 791 | unsigned int power_of_two; |
| 792 | |
| 793 | dynobj = elf_hash_table (info)->dynobj; |
| 794 | |
| 795 | /* Make sure we know what is going on here. */ |
| 796 | BFD_ASSERT (dynobj != NULL |
| 797 | && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) |
| 798 | || h->weakdef != NULL |
| 799 | || ((h->elf_link_hash_flags |
| 800 | & ELF_LINK_HASH_DEF_DYNAMIC) != 0 |
| 801 | && (h->elf_link_hash_flags |
| 802 | & ELF_LINK_HASH_REF_REGULAR) != 0 |
| 803 | && (h->elf_link_hash_flags |
| 804 | & ELF_LINK_HASH_DEF_REGULAR) == 0))); |
| 805 | |
| 806 | /* If this is a function, put it in the procedure linkage table. We |
| 807 | will fill in the contents of the procedure linkage table later, |
| 808 | when we know the address of the .got section. */ |
| 809 | if (h->type == STT_FUNC |
| 810 | || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) |
| 811 | { |
| 812 | if (! info->shared |
| 813 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 |
| 814 | && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0) |
| 815 | { |
| 816 | /* This case can occur if we saw a PLT32 reloc in an input |
| 817 | file, but the symbol was never referred to by a dynamic |
| 818 | object. In such a case, we don't actually need to build |
| 819 | a procedure linkage table, and we can just do a PC32 |
| 820 | reloc instead. */ |
| 821 | BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0); |
| 822 | return true; |
| 823 | } |
| 824 | |
| 825 | /* Make sure this symbol is output as a dynamic symbol. */ |
| 826 | if (h->dynindx == -1) |
| 827 | { |
| 828 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) |
| 829 | return false; |
| 830 | } |
| 831 | |
| 832 | s = bfd_get_section_by_name (dynobj, ".plt"); |
| 833 | BFD_ASSERT (s != NULL); |
| 834 | |
| 835 | /* If this is the first .plt entry, make room for the special |
| 836 | first entry. */ |
| 837 | if (s->_raw_size == 0) |
| 838 | s->_raw_size += PLT_ENTRY_SIZE; |
| 839 | |
| 840 | /* If this symbol is not defined in a regular file, and we are |
| 841 | not generating a shared library, then set the symbol to this |
| 842 | location in the .plt. This is required to make function |
| 843 | pointers compare as equal between the normal executable and |
| 844 | the shared library. */ |
| 845 | if (! info->shared |
| 846 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 847 | { |
| 848 | h->root.u.def.section = s; |
| 849 | h->root.u.def.value = s->_raw_size; |
| 850 | } |
| 851 | |
| 852 | h->plt.offset = s->_raw_size; |
| 853 | |
| 854 | /* Make room for this entry. */ |
| 855 | s->_raw_size += PLT_ENTRY_SIZE; |
| 856 | |
| 857 | /* We also need to make an entry in the .got.plt section, which |
| 858 | will be placed in the .got section by the linker script. */ |
| 859 | |
| 860 | s = bfd_get_section_by_name (dynobj, ".got.plt"); |
| 861 | BFD_ASSERT (s != NULL); |
| 862 | s->_raw_size += 4; |
| 863 | |
| 864 | /* We also need to make an entry in the .rel.plt section. */ |
| 865 | |
| 866 | s = bfd_get_section_by_name (dynobj, ".rel.plt"); |
| 867 | BFD_ASSERT (s != NULL); |
| 868 | s->_raw_size += sizeof (Elf32_External_Rel); |
| 869 | |
| 870 | return true; |
| 871 | } |
| 872 | |
| 873 | /* If this is a weak symbol, and there is a real definition, the |
| 874 | processor independent code will have arranged for us to see the |
| 875 | real definition first, and we can just use the same value. */ |
| 876 | if (h->weakdef != NULL) |
| 877 | { |
| 878 | BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined |
| 879 | || h->weakdef->root.type == bfd_link_hash_defweak); |
| 880 | h->root.u.def.section = h->weakdef->root.u.def.section; |
| 881 | h->root.u.def.value = h->weakdef->root.u.def.value; |
| 882 | return true; |
| 883 | } |
| 884 | |
| 885 | /* This is a reference to a symbol defined by a dynamic object which |
| 886 | is not a function. */ |
| 887 | |
| 888 | /* If we are creating a shared library, we must presume that the |
| 889 | only references to the symbol are via the global offset table. |
| 890 | For such cases we need not do anything here; the relocations will |
| 891 | be handled correctly by relocate_section. */ |
| 892 | if (info->shared) |
| 893 | return true; |
| 894 | |
| 895 | /* If there are no references to this symbol that do not use the |
| 896 | GOT, we don't need to generate a copy reloc. */ |
| 897 | if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0) |
| 898 | return true; |
| 899 | |
| 900 | /* We must allocate the symbol in our .dynbss section, which will |
| 901 | become part of the .bss section of the executable. There will be |
| 902 | an entry for this symbol in the .dynsym section. The dynamic |
| 903 | object will contain position independent code, so all references |
| 904 | from the dynamic object to this symbol will go through the global |
| 905 | offset table. The dynamic linker will use the .dynsym entry to |
| 906 | determine the address it must put in the global offset table, so |
| 907 | both the dynamic object and the regular object will refer to the |
| 908 | same memory location for the variable. */ |
| 909 | |
| 910 | s = bfd_get_section_by_name (dynobj, ".dynbss"); |
| 911 | BFD_ASSERT (s != NULL); |
| 912 | |
| 913 | /* We must generate a R_386_COPY reloc to tell the dynamic linker to |
| 914 | copy the initial value out of the dynamic object and into the |
| 915 | runtime process image. We need to remember the offset into the |
| 916 | .rel.bss section we are going to use. */ |
| 917 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) |
| 918 | { |
| 919 | asection *srel; |
| 920 | |
| 921 | srel = bfd_get_section_by_name (dynobj, ".rel.bss"); |
| 922 | BFD_ASSERT (srel != NULL); |
| 923 | srel->_raw_size += sizeof (Elf32_External_Rel); |
| 924 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; |
| 925 | } |
| 926 | |
| 927 | /* We need to figure out the alignment required for this symbol. I |
| 928 | have no idea how ELF linkers handle this. */ |
| 929 | power_of_two = bfd_log2 (h->size); |
| 930 | if (power_of_two > 3) |
| 931 | power_of_two = 3; |
| 932 | |
| 933 | /* Apply the required alignment. */ |
| 934 | s->_raw_size = BFD_ALIGN (s->_raw_size, |
| 935 | (bfd_size_type) (1 << power_of_two)); |
| 936 | if (power_of_two > bfd_get_section_alignment (dynobj, s)) |
| 937 | { |
| 938 | if (! bfd_set_section_alignment (dynobj, s, power_of_two)) |
| 939 | return false; |
| 940 | } |
| 941 | |
| 942 | /* Define the symbol as being at this point in the section. */ |
| 943 | h->root.u.def.section = s; |
| 944 | h->root.u.def.value = s->_raw_size; |
| 945 | |
| 946 | /* Increment the section size to make room for the symbol. */ |
| 947 | s->_raw_size += h->size; |
| 948 | |
| 949 | return true; |
| 950 | } |
| 951 | |
| 952 | /* Set the sizes of the dynamic sections. */ |
| 953 | |
| 954 | static boolean |
| 955 | elf_i386_size_dynamic_sections (output_bfd, info) |
| 956 | bfd *output_bfd; |
| 957 | struct bfd_link_info *info; |
| 958 | { |
| 959 | bfd *dynobj; |
| 960 | asection *s; |
| 961 | boolean plt; |
| 962 | boolean relocs; |
| 963 | boolean reltext; |
| 964 | |
| 965 | dynobj = elf_hash_table (info)->dynobj; |
| 966 | BFD_ASSERT (dynobj != NULL); |
| 967 | |
| 968 | if (elf_hash_table (info)->dynamic_sections_created) |
| 969 | { |
| 970 | /* Set the contents of the .interp section to the interpreter. */ |
| 971 | if (! info->shared) |
| 972 | { |
| 973 | s = bfd_get_section_by_name (dynobj, ".interp"); |
| 974 | BFD_ASSERT (s != NULL); |
| 975 | s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; |
| 976 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; |
| 977 | } |
| 978 | } |
| 979 | else |
| 980 | { |
| 981 | /* We may have created entries in the .rel.got section. |
| 982 | However, if we are not creating the dynamic sections, we will |
| 983 | not actually use these entries. Reset the size of .rel.got, |
| 984 | which will cause it to get stripped from the output file |
| 985 | below. */ |
| 986 | s = bfd_get_section_by_name (dynobj, ".rel.got"); |
| 987 | if (s != NULL) |
| 988 | s->_raw_size = 0; |
| 989 | } |
| 990 | |
| 991 | /* If this is a -Bsymbolic shared link, then we need to discard all |
| 992 | PC relative relocs against symbols defined in a regular object. |
| 993 | We allocated space for them in the check_relocs routine, but we |
| 994 | will not fill them in in the relocate_section routine. */ |
| 995 | if (info->shared && info->symbolic) |
| 996 | elf_i386_link_hash_traverse (elf_i386_hash_table (info), |
| 997 | elf_i386_discard_copies, |
| 998 | (PTR) NULL); |
| 999 | |
| 1000 | /* The check_relocs and adjust_dynamic_symbol entry points have |
| 1001 | determined the sizes of the various dynamic sections. Allocate |
| 1002 | memory for them. */ |
| 1003 | plt = false; |
| 1004 | relocs = false; |
| 1005 | reltext = false; |
| 1006 | for (s = dynobj->sections; s != NULL; s = s->next) |
| 1007 | { |
| 1008 | const char *name; |
| 1009 | boolean strip; |
| 1010 | |
| 1011 | if ((s->flags & SEC_LINKER_CREATED) == 0) |
| 1012 | continue; |
| 1013 | |
| 1014 | /* It's OK to base decisions on the section name, because none |
| 1015 | of the dynobj section names depend upon the input files. */ |
| 1016 | name = bfd_get_section_name (dynobj, s); |
| 1017 | |
| 1018 | strip = false; |
| 1019 | |
| 1020 | if (strcmp (name, ".plt") == 0) |
| 1021 | { |
| 1022 | if (s->_raw_size == 0) |
| 1023 | { |
| 1024 | /* Strip this section if we don't need it; see the |
| 1025 | comment below. */ |
| 1026 | strip = true; |
| 1027 | } |
| 1028 | else |
| 1029 | { |
| 1030 | /* Remember whether there is a PLT. */ |
| 1031 | plt = true; |
| 1032 | } |
| 1033 | } |
| 1034 | else if (strncmp (name, ".rel", 4) == 0) |
| 1035 | { |
| 1036 | if (s->_raw_size == 0) |
| 1037 | { |
| 1038 | /* If we don't need this section, strip it from the |
| 1039 | output file. This is mostly to handle .rel.bss and |
| 1040 | .rel.plt. We must create both sections in |
| 1041 | create_dynamic_sections, because they must be created |
| 1042 | before the linker maps input sections to output |
| 1043 | sections. The linker does that before |
| 1044 | adjust_dynamic_symbol is called, and it is that |
| 1045 | function which decides whether anything needs to go |
| 1046 | into these sections. */ |
| 1047 | strip = true; |
| 1048 | } |
| 1049 | else |
| 1050 | { |
| 1051 | asection *target; |
| 1052 | |
| 1053 | /* Remember whether there are any reloc sections other |
| 1054 | than .rel.plt. */ |
| 1055 | if (strcmp (name, ".rel.plt") != 0) |
| 1056 | { |
| 1057 | const char *outname; |
| 1058 | |
| 1059 | relocs = true; |
| 1060 | |
| 1061 | /* If this relocation section applies to a read only |
| 1062 | section, then we probably need a DT_TEXTREL |
| 1063 | entry. The entries in the .rel.plt section |
| 1064 | really apply to the .got section, which we |
| 1065 | created ourselves and so know is not readonly. */ |
| 1066 | outname = bfd_get_section_name (output_bfd, |
| 1067 | s->output_section); |
| 1068 | target = bfd_get_section_by_name (output_bfd, outname + 4); |
| 1069 | if (target != NULL |
| 1070 | && (target->flags & SEC_READONLY) != 0 |
| 1071 | && (target->flags & SEC_ALLOC) != 0) |
| 1072 | reltext = true; |
| 1073 | } |
| 1074 | |
| 1075 | /* We use the reloc_count field as a counter if we need |
| 1076 | to copy relocs into the output file. */ |
| 1077 | s->reloc_count = 0; |
| 1078 | } |
| 1079 | } |
| 1080 | else if (strncmp (name, ".got", 4) != 0) |
| 1081 | { |
| 1082 | /* It's not one of our sections, so don't allocate space. */ |
| 1083 | continue; |
| 1084 | } |
| 1085 | |
| 1086 | if (strip) |
| 1087 | { |
| 1088 | _bfd_strip_section_from_output (s); |
| 1089 | continue; |
| 1090 | } |
| 1091 | |
| 1092 | /* Allocate memory for the section contents. */ |
| 1093 | s->contents = (bfd_byte *) bfd_alloc (dynobj, s->_raw_size); |
| 1094 | if (s->contents == NULL && s->_raw_size != 0) |
| 1095 | return false; |
| 1096 | } |
| 1097 | |
| 1098 | if (elf_hash_table (info)->dynamic_sections_created) |
| 1099 | { |
| 1100 | /* Add some entries to the .dynamic section. We fill in the |
| 1101 | values later, in elf_i386_finish_dynamic_sections, but we |
| 1102 | must add the entries now so that we get the correct size for |
| 1103 | the .dynamic section. The DT_DEBUG entry is filled in by the |
| 1104 | dynamic linker and used by the debugger. */ |
| 1105 | if (! info->shared) |
| 1106 | { |
| 1107 | if (! bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0)) |
| 1108 | return false; |
| 1109 | } |
| 1110 | |
| 1111 | if (plt) |
| 1112 | { |
| 1113 | if (! bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0) |
| 1114 | || ! bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0) |
| 1115 | || ! bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_REL) |
| 1116 | || ! bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0)) |
| 1117 | return false; |
| 1118 | } |
| 1119 | |
| 1120 | if (relocs) |
| 1121 | { |
| 1122 | if (! bfd_elf32_add_dynamic_entry (info, DT_REL, 0) |
| 1123 | || ! bfd_elf32_add_dynamic_entry (info, DT_RELSZ, 0) |
| 1124 | || ! bfd_elf32_add_dynamic_entry (info, DT_RELENT, |
| 1125 | sizeof (Elf32_External_Rel))) |
| 1126 | return false; |
| 1127 | } |
| 1128 | |
| 1129 | if (reltext) |
| 1130 | { |
| 1131 | if (! bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0)) |
| 1132 | return false; |
| 1133 | } |
| 1134 | } |
| 1135 | |
| 1136 | return true; |
| 1137 | } |
| 1138 | |
| 1139 | /* This function is called via elf_i386_link_hash_traverse if we are |
| 1140 | creating a shared object with -Bsymbolic. It discards the space |
| 1141 | allocated to copy PC relative relocs against symbols which are |
| 1142 | defined in regular objects. We allocated space for them in the |
| 1143 | check_relocs routine, but we won't fill them in in the |
| 1144 | relocate_section routine. */ |
| 1145 | |
| 1146 | /*ARGSUSED*/ |
| 1147 | static boolean |
| 1148 | elf_i386_discard_copies (h, ignore) |
| 1149 | struct elf_i386_link_hash_entry *h; |
| 1150 | PTR ignore ATTRIBUTE_UNUSED; |
| 1151 | { |
| 1152 | struct elf_i386_pcrel_relocs_copied *s; |
| 1153 | |
| 1154 | /* We only discard relocs for symbols defined in a regular object. */ |
| 1155 | if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 1156 | return true; |
| 1157 | |
| 1158 | for (s = h->pcrel_relocs_copied; s != NULL; s = s->next) |
| 1159 | s->section->_raw_size -= s->count * sizeof (Elf32_External_Rel); |
| 1160 | |
| 1161 | return true; |
| 1162 | } |
| 1163 | |
| 1164 | /* Relocate an i386 ELF section. */ |
| 1165 | |
| 1166 | static boolean |
| 1167 | elf_i386_relocate_section (output_bfd, info, input_bfd, input_section, |
| 1168 | contents, relocs, local_syms, local_sections) |
| 1169 | bfd *output_bfd; |
| 1170 | struct bfd_link_info *info; |
| 1171 | bfd *input_bfd; |
| 1172 | asection *input_section; |
| 1173 | bfd_byte *contents; |
| 1174 | Elf_Internal_Rela *relocs; |
| 1175 | Elf_Internal_Sym *local_syms; |
| 1176 | asection **local_sections; |
| 1177 | { |
| 1178 | bfd *dynobj; |
| 1179 | Elf_Internal_Shdr *symtab_hdr; |
| 1180 | struct elf_link_hash_entry **sym_hashes; |
| 1181 | bfd_vma *local_got_offsets; |
| 1182 | asection *sgot; |
| 1183 | asection *splt; |
| 1184 | asection *sreloc; |
| 1185 | Elf_Internal_Rela *rel; |
| 1186 | Elf_Internal_Rela *relend; |
| 1187 | |
| 1188 | dynobj = elf_hash_table (info)->dynobj; |
| 1189 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 1190 | sym_hashes = elf_sym_hashes (input_bfd); |
| 1191 | local_got_offsets = elf_local_got_offsets (input_bfd); |
| 1192 | |
| 1193 | sgot = NULL; |
| 1194 | splt = NULL; |
| 1195 | sreloc = NULL; |
| 1196 | |
| 1197 | rel = relocs; |
| 1198 | relend = relocs + input_section->reloc_count; |
| 1199 | for (; rel < relend; rel++) |
| 1200 | { |
| 1201 | int r_type; |
| 1202 | reloc_howto_type *howto; |
| 1203 | unsigned long r_symndx; |
| 1204 | struct elf_link_hash_entry *h; |
| 1205 | Elf_Internal_Sym *sym; |
| 1206 | asection *sec; |
| 1207 | bfd_vma relocation; |
| 1208 | bfd_reloc_status_type r; |
| 1209 | |
| 1210 | r_type = ELF32_R_TYPE (rel->r_info); |
| 1211 | if (r_type == R_386_GNU_VTINHERIT |
| 1212 | || r_type == R_386_GNU_VTENTRY) |
| 1213 | continue; |
| 1214 | if (r_type < 0 |
| 1215 | || r_type >= (int) R_386_max |
| 1216 | || (r_type >= (int) FIRST_INVALID_RELOC |
| 1217 | && r_type <= (int) LAST_INVALID_RELOC)) |
| 1218 | { |
| 1219 | bfd_set_error (bfd_error_bad_value); |
| 1220 | return false; |
| 1221 | } |
| 1222 | howto = elf_howto_table + r_type; |
| 1223 | |
| 1224 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 1225 | |
| 1226 | if (info->relocateable) |
| 1227 | { |
| 1228 | /* This is a relocateable link. We don't have to change |
| 1229 | anything, unless the reloc is against a section symbol, |
| 1230 | in which case we have to adjust according to where the |
| 1231 | section symbol winds up in the output section. */ |
| 1232 | if (r_symndx < symtab_hdr->sh_info) |
| 1233 | { |
| 1234 | sym = local_syms + r_symndx; |
| 1235 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) |
| 1236 | { |
| 1237 | bfd_vma val; |
| 1238 | |
| 1239 | sec = local_sections[r_symndx]; |
| 1240 | val = bfd_get_32 (input_bfd, contents + rel->r_offset); |
| 1241 | val += sec->output_offset + sym->st_value; |
| 1242 | bfd_put_32 (input_bfd, val, contents + rel->r_offset); |
| 1243 | } |
| 1244 | } |
| 1245 | |
| 1246 | continue; |
| 1247 | } |
| 1248 | |
| 1249 | /* This is a final link. */ |
| 1250 | h = NULL; |
| 1251 | sym = NULL; |
| 1252 | sec = NULL; |
| 1253 | if (r_symndx < symtab_hdr->sh_info) |
| 1254 | { |
| 1255 | sym = local_syms + r_symndx; |
| 1256 | sec = local_sections[r_symndx]; |
| 1257 | relocation = (sec->output_section->vma |
| 1258 | + sec->output_offset |
| 1259 | + sym->st_value); |
| 1260 | } |
| 1261 | else |
| 1262 | { |
| 1263 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 1264 | while (h->root.type == bfd_link_hash_indirect |
| 1265 | || h->root.type == bfd_link_hash_warning) |
| 1266 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1267 | if (h->root.type == bfd_link_hash_defined |
| 1268 | || h->root.type == bfd_link_hash_defweak) |
| 1269 | { |
| 1270 | sec = h->root.u.def.section; |
| 1271 | if (r_type == R_386_GOTPC |
| 1272 | || (r_type == R_386_PLT32 |
| 1273 | && h->plt.offset != (bfd_vma) -1) |
| 1274 | || (r_type == R_386_GOT32 |
| 1275 | && elf_hash_table (info)->dynamic_sections_created |
| 1276 | && (! info->shared |
| 1277 | || (! info->symbolic && h->dynindx != -1) |
| 1278 | || (h->elf_link_hash_flags |
| 1279 | & ELF_LINK_HASH_DEF_REGULAR) == 0)) |
| 1280 | || (info->shared |
| 1281 | && ((! info->symbolic && h->dynindx != -1) |
| 1282 | || (h->elf_link_hash_flags |
| 1283 | & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 1284 | && (r_type == R_386_32 |
| 1285 | || r_type == R_386_PC32) |
| 1286 | && ((input_section->flags & SEC_ALLOC) != 0 |
| 1287 | /* DWARF will emit R_386_32 relocations in its |
| 1288 | sections against symbols defined externally |
| 1289 | in shared libraries. We can't do anything |
| 1290 | with them here. */ |
| 1291 | || (input_section->flags & SEC_DEBUGGING) != 0))) |
| 1292 | { |
| 1293 | /* In these cases, we don't need the relocation |
| 1294 | value. We check specially because in some |
| 1295 | obscure cases sec->output_section will be NULL. */ |
| 1296 | relocation = 0; |
| 1297 | } |
| 1298 | else if (sec->output_section == NULL) |
| 1299 | { |
| 1300 | (*_bfd_error_handler) |
| 1301 | (_("%s: warning: unresolvable relocation against symbol `%s' from %s section"), |
| 1302 | bfd_get_filename (input_bfd), h->root.root.string, |
| 1303 | bfd_get_section_name (input_bfd, input_section)); |
| 1304 | relocation = 0; |
| 1305 | } |
| 1306 | else |
| 1307 | relocation = (h->root.u.def.value |
| 1308 | + sec->output_section->vma |
| 1309 | + sec->output_offset); |
| 1310 | } |
| 1311 | else if (h->root.type == bfd_link_hash_undefweak) |
| 1312 | relocation = 0; |
| 1313 | else if (info->shared && !info->symbolic && !info->no_undefined) |
| 1314 | relocation = 0; |
| 1315 | else |
| 1316 | { |
| 1317 | if (! ((*info->callbacks->undefined_symbol) |
| 1318 | (info, h->root.root.string, input_bfd, |
| 1319 | input_section, rel->r_offset))) |
| 1320 | return false; |
| 1321 | relocation = 0; |
| 1322 | } |
| 1323 | } |
| 1324 | |
| 1325 | switch (r_type) |
| 1326 | { |
| 1327 | case R_386_GOT32: |
| 1328 | /* Relocation is to the entry for this symbol in the global |
| 1329 | offset table. */ |
| 1330 | if (sgot == NULL) |
| 1331 | { |
| 1332 | sgot = bfd_get_section_by_name (dynobj, ".got"); |
| 1333 | BFD_ASSERT (sgot != NULL); |
| 1334 | } |
| 1335 | |
| 1336 | if (h != NULL) |
| 1337 | { |
| 1338 | bfd_vma off; |
| 1339 | |
| 1340 | off = h->got.offset; |
| 1341 | BFD_ASSERT (off != (bfd_vma) -1); |
| 1342 | |
| 1343 | if (! elf_hash_table (info)->dynamic_sections_created |
| 1344 | || (info->shared |
| 1345 | && (info->symbolic || h->dynindx == -1) |
| 1346 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) |
| 1347 | { |
| 1348 | /* This is actually a static link, or it is a |
| 1349 | -Bsymbolic link and the symbol is defined |
| 1350 | locally, or the symbol was forced to be local |
| 1351 | because of a version file. We must initialize |
| 1352 | this entry in the global offset table. Since the |
| 1353 | offset must always be a multiple of 4, we use the |
| 1354 | least significant bit to record whether we have |
| 1355 | initialized it already. |
| 1356 | |
| 1357 | When doing a dynamic link, we create a .rel.got |
| 1358 | relocation entry to initialize the value. This |
| 1359 | is done in the finish_dynamic_symbol routine. */ |
| 1360 | if ((off & 1) != 0) |
| 1361 | off &= ~1; |
| 1362 | else |
| 1363 | { |
| 1364 | bfd_put_32 (output_bfd, relocation, |
| 1365 | sgot->contents + off); |
| 1366 | h->got.offset |= 1; |
| 1367 | } |
| 1368 | } |
| 1369 | |
| 1370 | relocation = sgot->output_offset + off; |
| 1371 | } |
| 1372 | else |
| 1373 | { |
| 1374 | bfd_vma off; |
| 1375 | |
| 1376 | BFD_ASSERT (local_got_offsets != NULL |
| 1377 | && local_got_offsets[r_symndx] != (bfd_vma) -1); |
| 1378 | |
| 1379 | off = local_got_offsets[r_symndx]; |
| 1380 | |
| 1381 | /* The offset must always be a multiple of 4. We use |
| 1382 | the least significant bit to record whether we have |
| 1383 | already generated the necessary reloc. */ |
| 1384 | if ((off & 1) != 0) |
| 1385 | off &= ~1; |
| 1386 | else |
| 1387 | { |
| 1388 | bfd_put_32 (output_bfd, relocation, sgot->contents + off); |
| 1389 | |
| 1390 | if (info->shared) |
| 1391 | { |
| 1392 | asection *srelgot; |
| 1393 | Elf_Internal_Rel outrel; |
| 1394 | |
| 1395 | srelgot = bfd_get_section_by_name (dynobj, ".rel.got"); |
| 1396 | BFD_ASSERT (srelgot != NULL); |
| 1397 | |
| 1398 | outrel.r_offset = (sgot->output_section->vma |
| 1399 | + sgot->output_offset |
| 1400 | + off); |
| 1401 | outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
| 1402 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, |
| 1403 | (((Elf32_External_Rel *) |
| 1404 | srelgot->contents) |
| 1405 | + srelgot->reloc_count)); |
| 1406 | ++srelgot->reloc_count; |
| 1407 | } |
| 1408 | |
| 1409 | local_got_offsets[r_symndx] |= 1; |
| 1410 | } |
| 1411 | |
| 1412 | relocation = sgot->output_offset + off; |
| 1413 | } |
| 1414 | |
| 1415 | break; |
| 1416 | |
| 1417 | case R_386_GOTOFF: |
| 1418 | /* Relocation is relative to the start of the global offset |
| 1419 | table. */ |
| 1420 | |
| 1421 | if (sgot == NULL) |
| 1422 | { |
| 1423 | sgot = bfd_get_section_by_name (dynobj, ".got"); |
| 1424 | BFD_ASSERT (sgot != NULL); |
| 1425 | } |
| 1426 | |
| 1427 | /* Note that sgot->output_offset is not involved in this |
| 1428 | calculation. We always want the start of .got. If we |
| 1429 | defined _GLOBAL_OFFSET_TABLE in a different way, as is |
| 1430 | permitted by the ABI, we might have to change this |
| 1431 | calculation. */ |
| 1432 | relocation -= sgot->output_section->vma; |
| 1433 | |
| 1434 | break; |
| 1435 | |
| 1436 | case R_386_GOTPC: |
| 1437 | /* Use global offset table as symbol value. */ |
| 1438 | |
| 1439 | if (sgot == NULL) |
| 1440 | { |
| 1441 | sgot = bfd_get_section_by_name (dynobj, ".got"); |
| 1442 | BFD_ASSERT (sgot != NULL); |
| 1443 | } |
| 1444 | |
| 1445 | relocation = sgot->output_section->vma; |
| 1446 | |
| 1447 | break; |
| 1448 | |
| 1449 | case R_386_PLT32: |
| 1450 | /* Relocation is to the entry for this symbol in the |
| 1451 | procedure linkage table. */ |
| 1452 | |
| 1453 | /* Resolve a PLT32 reloc again a local symbol directly, |
| 1454 | without using the procedure linkage table. */ |
| 1455 | if (h == NULL) |
| 1456 | break; |
| 1457 | |
| 1458 | if (h->plt.offset == (bfd_vma) -1) |
| 1459 | { |
| 1460 | /* We didn't make a PLT entry for this symbol. This |
| 1461 | happens when statically linking PIC code, or when |
| 1462 | using -Bsymbolic. */ |
| 1463 | break; |
| 1464 | } |
| 1465 | |
| 1466 | if (splt == NULL) |
| 1467 | { |
| 1468 | splt = bfd_get_section_by_name (dynobj, ".plt"); |
| 1469 | BFD_ASSERT (splt != NULL); |
| 1470 | } |
| 1471 | |
| 1472 | relocation = (splt->output_section->vma |
| 1473 | + splt->output_offset |
| 1474 | + h->plt.offset); |
| 1475 | |
| 1476 | break; |
| 1477 | |
| 1478 | case R_386_32: |
| 1479 | case R_386_PC32: |
| 1480 | if (info->shared |
| 1481 | && (input_section->flags & SEC_ALLOC) != 0 |
| 1482 | && (r_type != R_386_PC32 |
| 1483 | || (h != NULL |
| 1484 | && h->dynindx != -1 |
| 1485 | && (! info->symbolic |
| 1486 | || (h->elf_link_hash_flags |
| 1487 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) |
| 1488 | { |
| 1489 | Elf_Internal_Rel outrel; |
| 1490 | boolean skip, relocate; |
| 1491 | |
| 1492 | /* When generating a shared object, these relocations |
| 1493 | are copied into the output file to be resolved at run |
| 1494 | time. */ |
| 1495 | |
| 1496 | if (sreloc == NULL) |
| 1497 | { |
| 1498 | const char *name; |
| 1499 | |
| 1500 | name = (bfd_elf_string_from_elf_section |
| 1501 | (input_bfd, |
| 1502 | elf_elfheader (input_bfd)->e_shstrndx, |
| 1503 | elf_section_data (input_section)->rel_hdr.sh_name)); |
| 1504 | if (name == NULL) |
| 1505 | return false; |
| 1506 | |
| 1507 | BFD_ASSERT (strncmp (name, ".rel", 4) == 0 |
| 1508 | && strcmp (bfd_get_section_name (input_bfd, |
| 1509 | input_section), |
| 1510 | name + 4) == 0); |
| 1511 | |
| 1512 | sreloc = bfd_get_section_by_name (dynobj, name); |
| 1513 | BFD_ASSERT (sreloc != NULL); |
| 1514 | } |
| 1515 | |
| 1516 | skip = false; |
| 1517 | |
| 1518 | if (elf_section_data (input_section)->stab_info == NULL) |
| 1519 | outrel.r_offset = rel->r_offset; |
| 1520 | else |
| 1521 | { |
| 1522 | bfd_vma off; |
| 1523 | |
| 1524 | off = (_bfd_stab_section_offset |
| 1525 | (output_bfd, &elf_hash_table (info)->stab_info, |
| 1526 | input_section, |
| 1527 | &elf_section_data (input_section)->stab_info, |
| 1528 | rel->r_offset)); |
| 1529 | if (off == (bfd_vma) -1) |
| 1530 | skip = true; |
| 1531 | outrel.r_offset = off; |
| 1532 | } |
| 1533 | |
| 1534 | outrel.r_offset += (input_section->output_section->vma |
| 1535 | + input_section->output_offset); |
| 1536 | |
| 1537 | if (skip) |
| 1538 | { |
| 1539 | memset (&outrel, 0, sizeof outrel); |
| 1540 | relocate = false; |
| 1541 | } |
| 1542 | else if (r_type == R_386_PC32) |
| 1543 | { |
| 1544 | BFD_ASSERT (h != NULL && h->dynindx != -1); |
| 1545 | relocate = false; |
| 1546 | outrel.r_info = ELF32_R_INFO (h->dynindx, R_386_PC32); |
| 1547 | } |
| 1548 | else |
| 1549 | { |
| 1550 | /* h->dynindx may be -1 if this symbol was marked to |
| 1551 | become local. */ |
| 1552 | if (h == NULL |
| 1553 | || ((info->symbolic || h->dynindx == -1) |
| 1554 | && (h->elf_link_hash_flags |
| 1555 | & ELF_LINK_HASH_DEF_REGULAR) != 0)) |
| 1556 | { |
| 1557 | relocate = true; |
| 1558 | outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
| 1559 | } |
| 1560 | else |
| 1561 | { |
| 1562 | BFD_ASSERT (h->dynindx != -1); |
| 1563 | relocate = false; |
| 1564 | outrel.r_info = ELF32_R_INFO (h->dynindx, R_386_32); |
| 1565 | } |
| 1566 | } |
| 1567 | |
| 1568 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, |
| 1569 | (((Elf32_External_Rel *) |
| 1570 | sreloc->contents) |
| 1571 | + sreloc->reloc_count)); |
| 1572 | ++sreloc->reloc_count; |
| 1573 | |
| 1574 | /* If this reloc is against an external symbol, we do |
| 1575 | not want to fiddle with the addend. Otherwise, we |
| 1576 | need to include the symbol value so that it becomes |
| 1577 | an addend for the dynamic reloc. */ |
| 1578 | if (! relocate) |
| 1579 | continue; |
| 1580 | } |
| 1581 | |
| 1582 | break; |
| 1583 | |
| 1584 | default: |
| 1585 | break; |
| 1586 | } |
| 1587 | |
| 1588 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 1589 | contents, rel->r_offset, |
| 1590 | relocation, (bfd_vma) 0); |
| 1591 | |
| 1592 | if (r != bfd_reloc_ok) |
| 1593 | { |
| 1594 | switch (r) |
| 1595 | { |
| 1596 | default: |
| 1597 | case bfd_reloc_outofrange: |
| 1598 | abort (); |
| 1599 | case bfd_reloc_overflow: |
| 1600 | { |
| 1601 | const char *name; |
| 1602 | |
| 1603 | if (h != NULL) |
| 1604 | name = h->root.root.string; |
| 1605 | else |
| 1606 | { |
| 1607 | name = bfd_elf_string_from_elf_section (input_bfd, |
| 1608 | symtab_hdr->sh_link, |
| 1609 | sym->st_name); |
| 1610 | if (name == NULL) |
| 1611 | return false; |
| 1612 | if (*name == '\0') |
| 1613 | name = bfd_section_name (input_bfd, sec); |
| 1614 | } |
| 1615 | if (! ((*info->callbacks->reloc_overflow) |
| 1616 | (info, name, howto->name, (bfd_vma) 0, |
| 1617 | input_bfd, input_section, rel->r_offset))) |
| 1618 | return false; |
| 1619 | } |
| 1620 | break; |
| 1621 | } |
| 1622 | } |
| 1623 | } |
| 1624 | |
| 1625 | return true; |
| 1626 | } |
| 1627 | |
| 1628 | /* Finish up dynamic symbol handling. We set the contents of various |
| 1629 | dynamic sections here. */ |
| 1630 | |
| 1631 | static boolean |
| 1632 | elf_i386_finish_dynamic_symbol (output_bfd, info, h, sym) |
| 1633 | bfd *output_bfd; |
| 1634 | struct bfd_link_info *info; |
| 1635 | struct elf_link_hash_entry *h; |
| 1636 | Elf_Internal_Sym *sym; |
| 1637 | { |
| 1638 | bfd *dynobj; |
| 1639 | |
| 1640 | dynobj = elf_hash_table (info)->dynobj; |
| 1641 | |
| 1642 | if (h->plt.offset != (bfd_vma) -1) |
| 1643 | { |
| 1644 | asection *splt; |
| 1645 | asection *sgot; |
| 1646 | asection *srel; |
| 1647 | bfd_vma plt_index; |
| 1648 | bfd_vma got_offset; |
| 1649 | Elf_Internal_Rel rel; |
| 1650 | |
| 1651 | /* This symbol has an entry in the procedure linkage table. Set |
| 1652 | it up. */ |
| 1653 | |
| 1654 | BFD_ASSERT (h->dynindx != -1); |
| 1655 | |
| 1656 | splt = bfd_get_section_by_name (dynobj, ".plt"); |
| 1657 | sgot = bfd_get_section_by_name (dynobj, ".got.plt"); |
| 1658 | srel = bfd_get_section_by_name (dynobj, ".rel.plt"); |
| 1659 | BFD_ASSERT (splt != NULL && sgot != NULL && srel != NULL); |
| 1660 | |
| 1661 | /* Get the index in the procedure linkage table which |
| 1662 | corresponds to this symbol. This is the index of this symbol |
| 1663 | in all the symbols for which we are making plt entries. The |
| 1664 | first entry in the procedure linkage table is reserved. */ |
| 1665 | plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; |
| 1666 | |
| 1667 | /* Get the offset into the .got table of the entry that |
| 1668 | corresponds to this function. Each .got entry is 4 bytes. |
| 1669 | The first three are reserved. */ |
| 1670 | got_offset = (plt_index + 3) * 4; |
| 1671 | |
| 1672 | /* Fill in the entry in the procedure linkage table. */ |
| 1673 | if (! info->shared) |
| 1674 | { |
| 1675 | memcpy (splt->contents + h->plt.offset, elf_i386_plt_entry, |
| 1676 | PLT_ENTRY_SIZE); |
| 1677 | bfd_put_32 (output_bfd, |
| 1678 | (sgot->output_section->vma |
| 1679 | + sgot->output_offset |
| 1680 | + got_offset), |
| 1681 | splt->contents + h->plt.offset + 2); |
| 1682 | } |
| 1683 | else |
| 1684 | { |
| 1685 | memcpy (splt->contents + h->plt.offset, elf_i386_pic_plt_entry, |
| 1686 | PLT_ENTRY_SIZE); |
| 1687 | bfd_put_32 (output_bfd, got_offset, |
| 1688 | splt->contents + h->plt.offset + 2); |
| 1689 | } |
| 1690 | |
| 1691 | bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel), |
| 1692 | splt->contents + h->plt.offset + 7); |
| 1693 | bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE), |
| 1694 | splt->contents + h->plt.offset + 12); |
| 1695 | |
| 1696 | /* Fill in the entry in the global offset table. */ |
| 1697 | bfd_put_32 (output_bfd, |
| 1698 | (splt->output_section->vma |
| 1699 | + splt->output_offset |
| 1700 | + h->plt.offset |
| 1701 | + 6), |
| 1702 | sgot->contents + got_offset); |
| 1703 | |
| 1704 | /* Fill in the entry in the .rel.plt section. */ |
| 1705 | rel.r_offset = (sgot->output_section->vma |
| 1706 | + sgot->output_offset |
| 1707 | + got_offset); |
| 1708 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT); |
| 1709 | bfd_elf32_swap_reloc_out (output_bfd, &rel, |
| 1710 | ((Elf32_External_Rel *) srel->contents |
| 1711 | + plt_index)); |
| 1712 | |
| 1713 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 1714 | { |
| 1715 | /* Mark the symbol as undefined, rather than as defined in |
| 1716 | the .plt section. Leave the value alone. */ |
| 1717 | sym->st_shndx = SHN_UNDEF; |
| 1718 | } |
| 1719 | } |
| 1720 | |
| 1721 | if (h->got.offset != (bfd_vma) -1) |
| 1722 | { |
| 1723 | asection *sgot; |
| 1724 | asection *srel; |
| 1725 | Elf_Internal_Rel rel; |
| 1726 | |
| 1727 | /* This symbol has an entry in the global offset table. Set it |
| 1728 | up. */ |
| 1729 | |
| 1730 | sgot = bfd_get_section_by_name (dynobj, ".got"); |
| 1731 | srel = bfd_get_section_by_name (dynobj, ".rel.got"); |
| 1732 | BFD_ASSERT (sgot != NULL && srel != NULL); |
| 1733 | |
| 1734 | rel.r_offset = (sgot->output_section->vma |
| 1735 | + sgot->output_offset |
| 1736 | + (h->got.offset &~ 1)); |
| 1737 | |
| 1738 | /* If this is a -Bsymbolic link, and the symbol is defined |
| 1739 | locally, we just want to emit a RELATIVE reloc. Likewise if |
| 1740 | the symbol was forced to be local because of a version file. |
| 1741 | The entry in the global offset table will already have been |
| 1742 | initialized in the relocate_section function. */ |
| 1743 | if (info->shared |
| 1744 | && (info->symbolic || h->dynindx == -1) |
| 1745 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) |
| 1746 | rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
| 1747 | else |
| 1748 | { |
| 1749 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset); |
| 1750 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT); |
| 1751 | } |
| 1752 | |
| 1753 | bfd_elf32_swap_reloc_out (output_bfd, &rel, |
| 1754 | ((Elf32_External_Rel *) srel->contents |
| 1755 | + srel->reloc_count)); |
| 1756 | ++srel->reloc_count; |
| 1757 | } |
| 1758 | |
| 1759 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) |
| 1760 | { |
| 1761 | asection *s; |
| 1762 | Elf_Internal_Rel rel; |
| 1763 | |
| 1764 | /* This symbol needs a copy reloc. Set it up. */ |
| 1765 | |
| 1766 | BFD_ASSERT (h->dynindx != -1 |
| 1767 | && (h->root.type == bfd_link_hash_defined |
| 1768 | || h->root.type == bfd_link_hash_defweak)); |
| 1769 | |
| 1770 | s = bfd_get_section_by_name (h->root.u.def.section->owner, |
| 1771 | ".rel.bss"); |
| 1772 | BFD_ASSERT (s != NULL); |
| 1773 | |
| 1774 | rel.r_offset = (h->root.u.def.value |
| 1775 | + h->root.u.def.section->output_section->vma |
| 1776 | + h->root.u.def.section->output_offset); |
| 1777 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY); |
| 1778 | bfd_elf32_swap_reloc_out (output_bfd, &rel, |
| 1779 | ((Elf32_External_Rel *) s->contents |
| 1780 | + s->reloc_count)); |
| 1781 | ++s->reloc_count; |
| 1782 | } |
| 1783 | |
| 1784 | /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ |
| 1785 | if (strcmp (h->root.root.string, "_DYNAMIC") == 0 |
| 1786 | || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) |
| 1787 | sym->st_shndx = SHN_ABS; |
| 1788 | |
| 1789 | return true; |
| 1790 | } |
| 1791 | |
| 1792 | /* Finish up the dynamic sections. */ |
| 1793 | |
| 1794 | static boolean |
| 1795 | elf_i386_finish_dynamic_sections (output_bfd, info) |
| 1796 | bfd *output_bfd; |
| 1797 | struct bfd_link_info *info; |
| 1798 | { |
| 1799 | bfd *dynobj; |
| 1800 | asection *sgot; |
| 1801 | asection *sdyn; |
| 1802 | |
| 1803 | dynobj = elf_hash_table (info)->dynobj; |
| 1804 | |
| 1805 | sgot = bfd_get_section_by_name (dynobj, ".got.plt"); |
| 1806 | BFD_ASSERT (sgot != NULL); |
| 1807 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); |
| 1808 | |
| 1809 | if (elf_hash_table (info)->dynamic_sections_created) |
| 1810 | { |
| 1811 | asection *splt; |
| 1812 | Elf32_External_Dyn *dyncon, *dynconend; |
| 1813 | |
| 1814 | BFD_ASSERT (sdyn != NULL); |
| 1815 | |
| 1816 | dyncon = (Elf32_External_Dyn *) sdyn->contents; |
| 1817 | dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size); |
| 1818 | for (; dyncon < dynconend; dyncon++) |
| 1819 | { |
| 1820 | Elf_Internal_Dyn dyn; |
| 1821 | const char *name; |
| 1822 | asection *s; |
| 1823 | |
| 1824 | bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); |
| 1825 | |
| 1826 | switch (dyn.d_tag) |
| 1827 | { |
| 1828 | default: |
| 1829 | break; |
| 1830 | |
| 1831 | case DT_PLTGOT: |
| 1832 | name = ".got"; |
| 1833 | goto get_vma; |
| 1834 | case DT_JMPREL: |
| 1835 | name = ".rel.plt"; |
| 1836 | get_vma: |
| 1837 | s = bfd_get_section_by_name (output_bfd, name); |
| 1838 | BFD_ASSERT (s != NULL); |
| 1839 | dyn.d_un.d_ptr = s->vma; |
| 1840 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 1841 | break; |
| 1842 | |
| 1843 | case DT_PLTRELSZ: |
| 1844 | s = bfd_get_section_by_name (output_bfd, ".rel.plt"); |
| 1845 | BFD_ASSERT (s != NULL); |
| 1846 | if (s->_cooked_size != 0) |
| 1847 | dyn.d_un.d_val = s->_cooked_size; |
| 1848 | else |
| 1849 | dyn.d_un.d_val = s->_raw_size; |
| 1850 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 1851 | break; |
| 1852 | |
| 1853 | case DT_RELSZ: |
| 1854 | /* My reading of the SVR4 ABI indicates that the |
| 1855 | procedure linkage table relocs (DT_JMPREL) should be |
| 1856 | included in the overall relocs (DT_REL). This is |
| 1857 | what Solaris does. However, UnixWare can not handle |
| 1858 | that case. Therefore, we override the DT_RELSZ entry |
| 1859 | here to make it not include the JMPREL relocs. Since |
| 1860 | the linker script arranges for .rel.plt to follow all |
| 1861 | other relocation sections, we don't have to worry |
| 1862 | about changing the DT_REL entry. */ |
| 1863 | s = bfd_get_section_by_name (output_bfd, ".rel.plt"); |
| 1864 | if (s != NULL) |
| 1865 | { |
| 1866 | if (s->_cooked_size != 0) |
| 1867 | dyn.d_un.d_val -= s->_cooked_size; |
| 1868 | else |
| 1869 | dyn.d_un.d_val -= s->_raw_size; |
| 1870 | } |
| 1871 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 1872 | break; |
| 1873 | } |
| 1874 | } |
| 1875 | |
| 1876 | /* Fill in the first entry in the procedure linkage table. */ |
| 1877 | splt = bfd_get_section_by_name (dynobj, ".plt"); |
| 1878 | if (splt && splt->_raw_size > 0) |
| 1879 | { |
| 1880 | if (info->shared) |
| 1881 | memcpy (splt->contents, elf_i386_pic_plt0_entry, PLT_ENTRY_SIZE); |
| 1882 | else |
| 1883 | { |
| 1884 | memcpy (splt->contents, elf_i386_plt0_entry, PLT_ENTRY_SIZE); |
| 1885 | bfd_put_32 (output_bfd, |
| 1886 | sgot->output_section->vma + sgot->output_offset + 4, |
| 1887 | splt->contents + 2); |
| 1888 | bfd_put_32 (output_bfd, |
| 1889 | sgot->output_section->vma + sgot->output_offset + 8, |
| 1890 | splt->contents + 8); |
| 1891 | } |
| 1892 | |
| 1893 | /* UnixWare sets the entsize of .plt to 4, although that doesn't |
| 1894 | really seem like the right value. */ |
| 1895 | elf_section_data (splt->output_section)->this_hdr.sh_entsize = 4; |
| 1896 | } |
| 1897 | } |
| 1898 | |
| 1899 | /* Fill in the first three entries in the global offset table. */ |
| 1900 | if (sgot->_raw_size > 0) |
| 1901 | { |
| 1902 | if (sdyn == NULL) |
| 1903 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); |
| 1904 | else |
| 1905 | bfd_put_32 (output_bfd, |
| 1906 | sdyn->output_section->vma + sdyn->output_offset, |
| 1907 | sgot->contents); |
| 1908 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); |
| 1909 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); |
| 1910 | } |
| 1911 | |
| 1912 | elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; |
| 1913 | |
| 1914 | return true; |
| 1915 | } |
| 1916 | |
| 1917 | #define TARGET_LITTLE_SYM bfd_elf32_i386_vec |
| 1918 | #define TARGET_LITTLE_NAME "elf32-i386" |
| 1919 | #define ELF_ARCH bfd_arch_i386 |
| 1920 | #define ELF_MACHINE_CODE EM_386 |
| 1921 | #define ELF_MAXPAGESIZE 0x1000 |
| 1922 | #define elf_info_to_howto elf_i386_info_to_howto |
| 1923 | #define elf_info_to_howto_rel elf_i386_info_to_howto_rel |
| 1924 | #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup |
| 1925 | #define bfd_elf32_bfd_is_local_label_name \ |
| 1926 | elf_i386_is_local_label_name |
| 1927 | #define elf_backend_create_dynamic_sections \ |
| 1928 | _bfd_elf_create_dynamic_sections |
| 1929 | #define bfd_elf32_bfd_link_hash_table_create \ |
| 1930 | elf_i386_link_hash_table_create |
| 1931 | #define elf_backend_check_relocs elf_i386_check_relocs |
| 1932 | #define elf_backend_adjust_dynamic_symbol \ |
| 1933 | elf_i386_adjust_dynamic_symbol |
| 1934 | #define elf_backend_size_dynamic_sections \ |
| 1935 | elf_i386_size_dynamic_sections |
| 1936 | #define elf_backend_relocate_section elf_i386_relocate_section |
| 1937 | #define elf_backend_finish_dynamic_symbol \ |
| 1938 | elf_i386_finish_dynamic_symbol |
| 1939 | #define elf_backend_finish_dynamic_sections \ |
| 1940 | elf_i386_finish_dynamic_sections |
| 1941 | #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook |
| 1942 | #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook |
| 1943 | |
| 1944 | #define elf_backend_can_gc_sections 1 |
| 1945 | #define elf_backend_want_got_plt 1 |
| 1946 | #define elf_backend_plt_readonly 1 |
| 1947 | #define elf_backend_want_plt_sym 0 |
| 1948 | #define elf_backend_got_header_size 12 |
| 1949 | #define elf_backend_plt_header_size PLT_ENTRY_SIZE |
| 1950 | |
| 1951 | #include "elf32-target.h" |