elf32-m68k.c revision 1.1.1.2
1 /* Motorola 68k series support for 32-bit ELF 2 Copyright 1993, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 3 2004, 2005, 2006, 2007, 2008, 2009, 2010 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 3 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., 51 Franklin Street - Fifth Floor, Boston, 20 MA 02110-1301, USA. */ 21 22 #include "sysdep.h" 23 #include "bfd.h" 24 #include "bfdlink.h" 25 #include "libbfd.h" 26 #include "elf-bfd.h" 27 #include "elf/m68k.h" 28 #include "opcode/m68k.h" 29 30 static reloc_howto_type *reloc_type_lookup 31 PARAMS ((bfd *, bfd_reloc_code_real_type)); 32 static void rtype_to_howto 33 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *)); 34 static struct bfd_hash_entry *elf_m68k_link_hash_newfunc 35 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); 36 static struct bfd_link_hash_table *elf_m68k_link_hash_table_create 37 PARAMS ((bfd *)); 38 static bfd_boolean elf_m68k_check_relocs 39 PARAMS ((bfd *, struct bfd_link_info *, asection *, 40 const Elf_Internal_Rela *)); 41 static bfd_boolean elf_m68k_adjust_dynamic_symbol 42 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); 43 static bfd_boolean elf_m68k_size_dynamic_sections 44 PARAMS ((bfd *, struct bfd_link_info *)); 45 static bfd_boolean elf_m68k_discard_copies 46 PARAMS ((struct elf_link_hash_entry *, PTR)); 47 static bfd_boolean elf_m68k_relocate_section 48 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, 49 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); 50 static bfd_boolean elf_m68k_finish_dynamic_symbol 51 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, 52 Elf_Internal_Sym *)); 53 static bfd_boolean elf_m68k_finish_dynamic_sections 54 PARAMS ((bfd *, struct bfd_link_info *)); 55 56 static bfd_boolean elf32_m68k_set_private_flags 57 PARAMS ((bfd *, flagword)); 58 static bfd_boolean elf32_m68k_merge_private_bfd_data 59 PARAMS ((bfd *, bfd *)); 60 static bfd_boolean elf32_m68k_print_private_bfd_data 61 PARAMS ((bfd *, PTR)); 62 static enum elf_reloc_type_class elf32_m68k_reloc_type_class 63 PARAMS ((const Elf_Internal_Rela *)); 64 65 static reloc_howto_type howto_table[] = { 66 HOWTO(R_68K_NONE, 0, 0, 0, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_NONE", FALSE, 0, 0x00000000,FALSE), 67 HOWTO(R_68K_32, 0, 2,32, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_32", FALSE, 0, 0xffffffff,FALSE), 68 HOWTO(R_68K_16, 0, 1,16, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_16", FALSE, 0, 0x0000ffff,FALSE), 69 HOWTO(R_68K_8, 0, 0, 8, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_8", FALSE, 0, 0x000000ff,FALSE), 70 HOWTO(R_68K_PC32, 0, 2,32, TRUE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PC32", FALSE, 0, 0xffffffff,TRUE), 71 HOWTO(R_68K_PC16, 0, 1,16, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC16", FALSE, 0, 0x0000ffff,TRUE), 72 HOWTO(R_68K_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC8", FALSE, 0, 0x000000ff,TRUE), 73 HOWTO(R_68K_GOT32, 0, 2,32, TRUE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32", FALSE, 0, 0xffffffff,TRUE), 74 HOWTO(R_68K_GOT16, 0, 1,16, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16", FALSE, 0, 0x0000ffff,TRUE), 75 HOWTO(R_68K_GOT8, 0, 0, 8, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8", FALSE, 0, 0x000000ff,TRUE), 76 HOWTO(R_68K_GOT32O, 0, 2,32, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32O", FALSE, 0, 0xffffffff,FALSE), 77 HOWTO(R_68K_GOT16O, 0, 1,16, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16O", FALSE, 0, 0x0000ffff,FALSE), 78 HOWTO(R_68K_GOT8O, 0, 0, 8, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8O", FALSE, 0, 0x000000ff,FALSE), 79 HOWTO(R_68K_PLT32, 0, 2,32, TRUE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32", FALSE, 0, 0xffffffff,TRUE), 80 HOWTO(R_68K_PLT16, 0, 1,16, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16", FALSE, 0, 0x0000ffff,TRUE), 81 HOWTO(R_68K_PLT8, 0, 0, 8, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8", FALSE, 0, 0x000000ff,TRUE), 82 HOWTO(R_68K_PLT32O, 0, 2,32, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32O", FALSE, 0, 0xffffffff,FALSE), 83 HOWTO(R_68K_PLT16O, 0, 1,16, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16O", FALSE, 0, 0x0000ffff,FALSE), 84 HOWTO(R_68K_PLT8O, 0, 0, 8, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8O", FALSE, 0, 0x000000ff,FALSE), 85 HOWTO(R_68K_COPY, 0, 0, 0, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_COPY", FALSE, 0, 0xffffffff,FALSE), 86 HOWTO(R_68K_GLOB_DAT, 0, 2,32, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_GLOB_DAT", FALSE, 0, 0xffffffff,FALSE), 87 HOWTO(R_68K_JMP_SLOT, 0, 2,32, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_JMP_SLOT", FALSE, 0, 0xffffffff,FALSE), 88 HOWTO(R_68K_RELATIVE, 0, 2,32, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_RELATIVE", FALSE, 0, 0xffffffff,FALSE), 89 /* GNU extension to record C++ vtable hierarchy. */ 90 HOWTO (R_68K_GNU_VTINHERIT, /* type */ 91 0, /* rightshift */ 92 2, /* size (0 = byte, 1 = short, 2 = long) */ 93 0, /* bitsize */ 94 FALSE, /* pc_relative */ 95 0, /* bitpos */ 96 complain_overflow_dont, /* complain_on_overflow */ 97 NULL, /* special_function */ 98 "R_68K_GNU_VTINHERIT", /* name */ 99 FALSE, /* partial_inplace */ 100 0, /* src_mask */ 101 0, /* dst_mask */ 102 FALSE), 103 /* GNU extension to record C++ vtable member usage. */ 104 HOWTO (R_68K_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_68K_GNU_VTENTRY", /* name */ 113 FALSE, /* partial_inplace */ 114 0, /* src_mask */ 115 0, /* dst_mask */ 116 FALSE), 117 118 /* TLS general dynamic variable reference. */ 119 HOWTO (R_68K_TLS_GD32, /* type */ 120 0, /* rightshift */ 121 2, /* size (0 = byte, 1 = short, 2 = long) */ 122 32, /* bitsize */ 123 FALSE, /* pc_relative */ 124 0, /* bitpos */ 125 complain_overflow_bitfield, /* complain_on_overflow */ 126 bfd_elf_generic_reloc, /* special_function */ 127 "R_68K_TLS_GD32", /* name */ 128 FALSE, /* partial_inplace */ 129 0, /* src_mask */ 130 0xffffffff, /* dst_mask */ 131 FALSE), /* pcrel_offset */ 132 133 HOWTO (R_68K_TLS_GD16, /* type */ 134 0, /* rightshift */ 135 1, /* size (0 = byte, 1 = short, 2 = long) */ 136 16, /* bitsize */ 137 FALSE, /* pc_relative */ 138 0, /* bitpos */ 139 complain_overflow_signed, /* complain_on_overflow */ 140 bfd_elf_generic_reloc, /* special_function */ 141 "R_68K_TLS_GD16", /* name */ 142 FALSE, /* partial_inplace */ 143 0, /* src_mask */ 144 0x0000ffff, /* dst_mask */ 145 FALSE), /* pcrel_offset */ 146 147 HOWTO (R_68K_TLS_GD8, /* type */ 148 0, /* rightshift */ 149 0, /* size (0 = byte, 1 = short, 2 = long) */ 150 8, /* bitsize */ 151 FALSE, /* pc_relative */ 152 0, /* bitpos */ 153 complain_overflow_signed, /* complain_on_overflow */ 154 bfd_elf_generic_reloc, /* special_function */ 155 "R_68K_TLS_GD8", /* name */ 156 FALSE, /* partial_inplace */ 157 0, /* src_mask */ 158 0x000000ff, /* dst_mask */ 159 FALSE), /* pcrel_offset */ 160 161 /* TLS local dynamic variable reference. */ 162 HOWTO (R_68K_TLS_LDM32, /* type */ 163 0, /* rightshift */ 164 2, /* size (0 = byte, 1 = short, 2 = long) */ 165 32, /* bitsize */ 166 FALSE, /* pc_relative */ 167 0, /* bitpos */ 168 complain_overflow_bitfield, /* complain_on_overflow */ 169 bfd_elf_generic_reloc, /* special_function */ 170 "R_68K_TLS_LDM32", /* name */ 171 FALSE, /* partial_inplace */ 172 0, /* src_mask */ 173 0xffffffff, /* dst_mask */ 174 FALSE), /* pcrel_offset */ 175 176 HOWTO (R_68K_TLS_LDM16, /* type */ 177 0, /* rightshift */ 178 1, /* size (0 = byte, 1 = short, 2 = long) */ 179 16, /* bitsize */ 180 FALSE, /* pc_relative */ 181 0, /* bitpos */ 182 complain_overflow_signed, /* complain_on_overflow */ 183 bfd_elf_generic_reloc, /* special_function */ 184 "R_68K_TLS_LDM16", /* name */ 185 FALSE, /* partial_inplace */ 186 0, /* src_mask */ 187 0x0000ffff, /* dst_mask */ 188 FALSE), /* pcrel_offset */ 189 190 HOWTO (R_68K_TLS_LDM8, /* type */ 191 0, /* rightshift */ 192 0, /* size (0 = byte, 1 = short, 2 = long) */ 193 8, /* bitsize */ 194 FALSE, /* pc_relative */ 195 0, /* bitpos */ 196 complain_overflow_signed, /* complain_on_overflow */ 197 bfd_elf_generic_reloc, /* special_function */ 198 "R_68K_TLS_LDM8", /* name */ 199 FALSE, /* partial_inplace */ 200 0, /* src_mask */ 201 0x000000ff, /* dst_mask */ 202 FALSE), /* pcrel_offset */ 203 204 HOWTO (R_68K_TLS_LDO32, /* type */ 205 0, /* rightshift */ 206 2, /* size (0 = byte, 1 = short, 2 = long) */ 207 32, /* bitsize */ 208 FALSE, /* pc_relative */ 209 0, /* bitpos */ 210 complain_overflow_bitfield, /* complain_on_overflow */ 211 bfd_elf_generic_reloc, /* special_function */ 212 "R_68K_TLS_LDO32", /* name */ 213 FALSE, /* partial_inplace */ 214 0, /* src_mask */ 215 0xffffffff, /* dst_mask */ 216 FALSE), /* pcrel_offset */ 217 218 HOWTO (R_68K_TLS_LDO16, /* type */ 219 0, /* rightshift */ 220 1, /* size (0 = byte, 1 = short, 2 = long) */ 221 16, /* bitsize */ 222 FALSE, /* pc_relative */ 223 0, /* bitpos */ 224 complain_overflow_signed, /* complain_on_overflow */ 225 bfd_elf_generic_reloc, /* special_function */ 226 "R_68K_TLS_LDO16", /* name */ 227 FALSE, /* partial_inplace */ 228 0, /* src_mask */ 229 0x0000ffff, /* dst_mask */ 230 FALSE), /* pcrel_offset */ 231 232 HOWTO (R_68K_TLS_LDO8, /* type */ 233 0, /* rightshift */ 234 0, /* size (0 = byte, 1 = short, 2 = long) */ 235 8, /* bitsize */ 236 FALSE, /* pc_relative */ 237 0, /* bitpos */ 238 complain_overflow_signed, /* complain_on_overflow */ 239 bfd_elf_generic_reloc, /* special_function */ 240 "R_68K_TLS_LDO8", /* name */ 241 FALSE, /* partial_inplace */ 242 0, /* src_mask */ 243 0x000000ff, /* dst_mask */ 244 FALSE), /* pcrel_offset */ 245 246 /* TLS initial execution variable reference. */ 247 HOWTO (R_68K_TLS_IE32, /* type */ 248 0, /* rightshift */ 249 2, /* size (0 = byte, 1 = short, 2 = long) */ 250 32, /* bitsize */ 251 FALSE, /* pc_relative */ 252 0, /* bitpos */ 253 complain_overflow_bitfield, /* complain_on_overflow */ 254 bfd_elf_generic_reloc, /* special_function */ 255 "R_68K_TLS_IE32", /* name */ 256 FALSE, /* partial_inplace */ 257 0, /* src_mask */ 258 0xffffffff, /* dst_mask */ 259 FALSE), /* pcrel_offset */ 260 261 HOWTO (R_68K_TLS_IE16, /* type */ 262 0, /* rightshift */ 263 1, /* size (0 = byte, 1 = short, 2 = long) */ 264 16, /* bitsize */ 265 FALSE, /* pc_relative */ 266 0, /* bitpos */ 267 complain_overflow_signed, /* complain_on_overflow */ 268 bfd_elf_generic_reloc, /* special_function */ 269 "R_68K_TLS_IE16", /* name */ 270 FALSE, /* partial_inplace */ 271 0, /* src_mask */ 272 0x0000ffff, /* dst_mask */ 273 FALSE), /* pcrel_offset */ 274 275 HOWTO (R_68K_TLS_IE8, /* type */ 276 0, /* rightshift */ 277 0, /* size (0 = byte, 1 = short, 2 = long) */ 278 8, /* bitsize */ 279 FALSE, /* pc_relative */ 280 0, /* bitpos */ 281 complain_overflow_signed, /* complain_on_overflow */ 282 bfd_elf_generic_reloc, /* special_function */ 283 "R_68K_TLS_IE8", /* name */ 284 FALSE, /* partial_inplace */ 285 0, /* src_mask */ 286 0x000000ff, /* dst_mask */ 287 FALSE), /* pcrel_offset */ 288 289 /* TLS local execution variable reference. */ 290 HOWTO (R_68K_TLS_LE32, /* type */ 291 0, /* rightshift */ 292 2, /* size (0 = byte, 1 = short, 2 = long) */ 293 32, /* bitsize */ 294 FALSE, /* pc_relative */ 295 0, /* bitpos */ 296 complain_overflow_bitfield, /* complain_on_overflow */ 297 bfd_elf_generic_reloc, /* special_function */ 298 "R_68K_TLS_LE32", /* name */ 299 FALSE, /* partial_inplace */ 300 0, /* src_mask */ 301 0xffffffff, /* dst_mask */ 302 FALSE), /* pcrel_offset */ 303 304 HOWTO (R_68K_TLS_LE16, /* type */ 305 0, /* rightshift */ 306 1, /* size (0 = byte, 1 = short, 2 = long) */ 307 16, /* bitsize */ 308 FALSE, /* pc_relative */ 309 0, /* bitpos */ 310 complain_overflow_signed, /* complain_on_overflow */ 311 bfd_elf_generic_reloc, /* special_function */ 312 "R_68K_TLS_LE16", /* name */ 313 FALSE, /* partial_inplace */ 314 0, /* src_mask */ 315 0x0000ffff, /* dst_mask */ 316 FALSE), /* pcrel_offset */ 317 318 HOWTO (R_68K_TLS_LE8, /* type */ 319 0, /* rightshift */ 320 0, /* size (0 = byte, 1 = short, 2 = long) */ 321 8, /* bitsize */ 322 FALSE, /* pc_relative */ 323 0, /* bitpos */ 324 complain_overflow_signed, /* complain_on_overflow */ 325 bfd_elf_generic_reloc, /* special_function */ 326 "R_68K_TLS_LE8", /* name */ 327 FALSE, /* partial_inplace */ 328 0, /* src_mask */ 329 0x000000ff, /* dst_mask */ 330 FALSE), /* pcrel_offset */ 331 332 /* TLS GD/LD dynamic relocations. */ 333 HOWTO (R_68K_TLS_DTPMOD32, /* type */ 334 0, /* rightshift */ 335 2, /* size (0 = byte, 1 = short, 2 = long) */ 336 32, /* bitsize */ 337 FALSE, /* pc_relative */ 338 0, /* bitpos */ 339 complain_overflow_dont, /* complain_on_overflow */ 340 bfd_elf_generic_reloc, /* special_function */ 341 "R_68K_TLS_DTPMOD32", /* name */ 342 FALSE, /* partial_inplace */ 343 0, /* src_mask */ 344 0xffffffff, /* dst_mask */ 345 FALSE), /* pcrel_offset */ 346 347 HOWTO (R_68K_TLS_DTPREL32, /* type */ 348 0, /* rightshift */ 349 2, /* size (0 = byte, 1 = short, 2 = long) */ 350 32, /* bitsize */ 351 FALSE, /* pc_relative */ 352 0, /* bitpos */ 353 complain_overflow_dont, /* complain_on_overflow */ 354 bfd_elf_generic_reloc, /* special_function */ 355 "R_68K_TLS_DTPREL32", /* name */ 356 FALSE, /* partial_inplace */ 357 0, /* src_mask */ 358 0xffffffff, /* dst_mask */ 359 FALSE), /* pcrel_offset */ 360 361 HOWTO (R_68K_TLS_TPREL32, /* type */ 362 0, /* rightshift */ 363 2, /* size (0 = byte, 1 = short, 2 = long) */ 364 32, /* bitsize */ 365 FALSE, /* pc_relative */ 366 0, /* bitpos */ 367 complain_overflow_dont, /* complain_on_overflow */ 368 bfd_elf_generic_reloc, /* special_function */ 369 "R_68K_TLS_TPREL32", /* name */ 370 FALSE, /* partial_inplace */ 371 0, /* src_mask */ 372 0xffffffff, /* dst_mask */ 373 FALSE), /* pcrel_offset */ 374 }; 375 376 static void 377 rtype_to_howto (bfd *abfd, arelent *cache_ptr, Elf_Internal_Rela *dst) 378 { 379 unsigned int indx = ELF32_R_TYPE (dst->r_info); 380 381 if (indx >= (unsigned int) R_68K_max) 382 { 383 (*_bfd_error_handler) (_("%B: invalid relocation type %d"), 384 abfd, (int) indx); 385 indx = R_68K_NONE; 386 } 387 cache_ptr->howto = &howto_table[indx]; 388 } 389 390 #define elf_info_to_howto rtype_to_howto 391 392 static const struct 393 { 394 bfd_reloc_code_real_type bfd_val; 395 int elf_val; 396 } 397 reloc_map[] = 398 { 399 { BFD_RELOC_NONE, R_68K_NONE }, 400 { BFD_RELOC_32, R_68K_32 }, 401 { BFD_RELOC_16, R_68K_16 }, 402 { BFD_RELOC_8, R_68K_8 }, 403 { BFD_RELOC_32_PCREL, R_68K_PC32 }, 404 { BFD_RELOC_16_PCREL, R_68K_PC16 }, 405 { BFD_RELOC_8_PCREL, R_68K_PC8 }, 406 { BFD_RELOC_32_GOT_PCREL, R_68K_GOT32 }, 407 { BFD_RELOC_16_GOT_PCREL, R_68K_GOT16 }, 408 { BFD_RELOC_8_GOT_PCREL, R_68K_GOT8 }, 409 { BFD_RELOC_32_GOTOFF, R_68K_GOT32O }, 410 { BFD_RELOC_16_GOTOFF, R_68K_GOT16O }, 411 { BFD_RELOC_8_GOTOFF, R_68K_GOT8O }, 412 { BFD_RELOC_32_PLT_PCREL, R_68K_PLT32 }, 413 { BFD_RELOC_16_PLT_PCREL, R_68K_PLT16 }, 414 { BFD_RELOC_8_PLT_PCREL, R_68K_PLT8 }, 415 { BFD_RELOC_32_PLTOFF, R_68K_PLT32O }, 416 { BFD_RELOC_16_PLTOFF, R_68K_PLT16O }, 417 { BFD_RELOC_8_PLTOFF, R_68K_PLT8O }, 418 { BFD_RELOC_NONE, R_68K_COPY }, 419 { BFD_RELOC_68K_GLOB_DAT, R_68K_GLOB_DAT }, 420 { BFD_RELOC_68K_JMP_SLOT, R_68K_JMP_SLOT }, 421 { BFD_RELOC_68K_RELATIVE, R_68K_RELATIVE }, 422 { BFD_RELOC_CTOR, R_68K_32 }, 423 { BFD_RELOC_VTABLE_INHERIT, R_68K_GNU_VTINHERIT }, 424 { BFD_RELOC_VTABLE_ENTRY, R_68K_GNU_VTENTRY }, 425 { BFD_RELOC_68K_TLS_GD32, R_68K_TLS_GD32 }, 426 { BFD_RELOC_68K_TLS_GD16, R_68K_TLS_GD16 }, 427 { BFD_RELOC_68K_TLS_GD8, R_68K_TLS_GD8 }, 428 { BFD_RELOC_68K_TLS_LDM32, R_68K_TLS_LDM32 }, 429 { BFD_RELOC_68K_TLS_LDM16, R_68K_TLS_LDM16 }, 430 { BFD_RELOC_68K_TLS_LDM8, R_68K_TLS_LDM8 }, 431 { BFD_RELOC_68K_TLS_LDO32, R_68K_TLS_LDO32 }, 432 { BFD_RELOC_68K_TLS_LDO16, R_68K_TLS_LDO16 }, 433 { BFD_RELOC_68K_TLS_LDO8, R_68K_TLS_LDO8 }, 434 { BFD_RELOC_68K_TLS_IE32, R_68K_TLS_IE32 }, 435 { BFD_RELOC_68K_TLS_IE16, R_68K_TLS_IE16 }, 436 { BFD_RELOC_68K_TLS_IE8, R_68K_TLS_IE8 }, 437 { BFD_RELOC_68K_TLS_LE32, R_68K_TLS_LE32 }, 438 { BFD_RELOC_68K_TLS_LE16, R_68K_TLS_LE16 }, 439 { BFD_RELOC_68K_TLS_LE8, R_68K_TLS_LE8 }, 440 }; 441 442 static reloc_howto_type * 443 reloc_type_lookup (abfd, code) 444 bfd *abfd ATTRIBUTE_UNUSED; 445 bfd_reloc_code_real_type code; 446 { 447 unsigned int i; 448 for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++) 449 { 450 if (reloc_map[i].bfd_val == code) 451 return &howto_table[reloc_map[i].elf_val]; 452 } 453 return 0; 454 } 455 456 static reloc_howto_type * 457 reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name) 458 { 459 unsigned int i; 460 461 for (i = 0; i < sizeof (howto_table) / sizeof (howto_table[0]); i++) 462 if (howto_table[i].name != NULL 463 && strcasecmp (howto_table[i].name, r_name) == 0) 464 return &howto_table[i]; 465 466 return NULL; 467 } 468 469 #define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup 470 #define bfd_elf32_bfd_reloc_name_lookup reloc_name_lookup 471 #define ELF_ARCH bfd_arch_m68k 472 #define ELF_TARGET_ID M68K_ELF_DATA 473 474 /* Functions for the m68k ELF linker. */ 476 477 /* The name of the dynamic interpreter. This is put in the .interp 478 section. */ 479 480 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" 481 482 /* Describes one of the various PLT styles. */ 483 484 struct elf_m68k_plt_info 485 { 486 /* The size of each PLT entry. */ 487 bfd_vma size; 488 489 /* The template for the first PLT entry. */ 490 const bfd_byte *plt0_entry; 491 492 /* Offsets of fields in PLT0_ENTRY that require R_68K_PC32 relocations. 493 The comments by each member indicate the value that the relocation 494 is against. */ 495 struct { 496 unsigned int got4; /* .got + 4 */ 497 unsigned int got8; /* .got + 8 */ 498 } plt0_relocs; 499 500 /* The template for a symbol's PLT entry. */ 501 const bfd_byte *symbol_entry; 502 503 /* Offsets of fields in SYMBOL_ENTRY that require R_68K_PC32 relocations. 504 The comments by each member indicate the value that the relocation 505 is against. */ 506 struct { 507 unsigned int got; /* the symbol's .got.plt entry */ 508 unsigned int plt; /* .plt */ 509 } symbol_relocs; 510 511 /* The offset of the resolver stub from the start of SYMBOL_ENTRY. 512 The stub starts with "move.l #relocoffset,%d0". */ 513 bfd_vma symbol_resolve_entry; 514 }; 515 516 /* The size in bytes of an entry in the procedure linkage table. */ 517 518 #define PLT_ENTRY_SIZE 20 519 520 /* The first entry in a procedure linkage table looks like this. See 521 the SVR4 ABI m68k supplement to see how this works. */ 522 523 static const bfd_byte elf_m68k_plt0_entry[PLT_ENTRY_SIZE] = 524 { 525 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */ 526 0, 0, 0, 2, /* + (.got + 4) - . */ 527 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,addr]) */ 528 0, 0, 0, 2, /* + (.got + 8) - . */ 529 0, 0, 0, 0 /* pad out to 20 bytes. */ 530 }; 531 532 /* Subsequent entries in a procedure linkage table look like this. */ 533 534 static const bfd_byte elf_m68k_plt_entry[PLT_ENTRY_SIZE] = 535 { 536 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,symbol@GOTPC]) */ 537 0, 0, 0, 2, /* + (.got.plt entry) - . */ 538 0x2f, 0x3c, /* move.l #offset,-(%sp) */ 539 0, 0, 0, 0, /* + reloc index */ 540 0x60, 0xff, /* bra.l .plt */ 541 0, 0, 0, 0 /* + .plt - . */ 542 }; 543 544 static const struct elf_m68k_plt_info elf_m68k_plt_info = { 545 PLT_ENTRY_SIZE, 546 elf_m68k_plt0_entry, { 4, 12 }, 547 elf_m68k_plt_entry, { 4, 16 }, 8 548 }; 549 550 #define ISAB_PLT_ENTRY_SIZE 24 551 552 static const bfd_byte elf_isab_plt0_entry[ISAB_PLT_ENTRY_SIZE] = 553 { 554 0x20, 0x3c, /* move.l #offset,%d0 */ 555 0, 0, 0, 0, /* + (.got + 4) - . */ 556 0x2f, 0x3b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l),-(%sp) */ 557 0x20, 0x3c, /* move.l #offset,%d0 */ 558 0, 0, 0, 0, /* + (.got + 8) - . */ 559 0x20, 0x7b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l), %a0 */ 560 0x4e, 0xd0, /* jmp (%a0) */ 561 0x4e, 0x71 /* nop */ 562 }; 563 564 /* Subsequent entries in a procedure linkage table look like this. */ 565 566 static const bfd_byte elf_isab_plt_entry[ISAB_PLT_ENTRY_SIZE] = 567 { 568 0x20, 0x3c, /* move.l #offset,%d0 */ 569 0, 0, 0, 0, /* + (.got.plt entry) - . */ 570 0x20, 0x7b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l), %a0 */ 571 0x4e, 0xd0, /* jmp (%a0) */ 572 0x2f, 0x3c, /* move.l #offset,-(%sp) */ 573 0, 0, 0, 0, /* + reloc index */ 574 0x60, 0xff, /* bra.l .plt */ 575 0, 0, 0, 0 /* + .plt - . */ 576 }; 577 578 static const struct elf_m68k_plt_info elf_isab_plt_info = { 579 ISAB_PLT_ENTRY_SIZE, 580 elf_isab_plt0_entry, { 2, 12 }, 581 elf_isab_plt_entry, { 2, 20 }, 12 582 }; 583 584 #define ISAC_PLT_ENTRY_SIZE 24 585 586 static const bfd_byte elf_isac_plt0_entry[ISAC_PLT_ENTRY_SIZE] = 587 { 588 0x20, 0x3c, /* move.l #offset,%d0 */ 589 0, 0, 0, 0, /* replaced with .got + 4 - . */ 590 0x2e, 0xbb, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l),(%sp) */ 591 0x20, 0x3c, /* move.l #offset,%d0 */ 592 0, 0, 0, 0, /* replaced with .got + 8 - . */ 593 0x20, 0x7b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l), %a0 */ 594 0x4e, 0xd0, /* jmp (%a0) */ 595 0x4e, 0x71 /* nop */ 596 }; 597 598 /* Subsequent entries in a procedure linkage table look like this. */ 599 600 static const bfd_byte elf_isac_plt_entry[ISAC_PLT_ENTRY_SIZE] = 601 { 602 0x20, 0x3c, /* move.l #offset,%d0 */ 603 0, 0, 0, 0, /* replaced with (.got entry) - . */ 604 0x20, 0x7b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l), %a0 */ 605 0x4e, 0xd0, /* jmp (%a0) */ 606 0x2f, 0x3c, /* move.l #offset,-(%sp) */ 607 0, 0, 0, 0, /* replaced with offset into relocation table */ 608 0x61, 0xff, /* bsr.l .plt */ 609 0, 0, 0, 0 /* replaced with .plt - . */ 610 }; 611 612 static const struct elf_m68k_plt_info elf_isac_plt_info = { 613 ISAC_PLT_ENTRY_SIZE, 614 elf_isac_plt0_entry, { 2, 12}, 615 elf_isac_plt_entry, { 2, 20 }, 12 616 }; 617 618 #define CPU32_PLT_ENTRY_SIZE 24 619 /* Procedure linkage table entries for the cpu32 */ 620 static const bfd_byte elf_cpu32_plt0_entry[CPU32_PLT_ENTRY_SIZE] = 621 { 622 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */ 623 0, 0, 0, 2, /* + (.got + 4) - . */ 624 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */ 625 0, 0, 0, 2, /* + (.got + 8) - . */ 626 0x4e, 0xd1, /* jmp %a1@ */ 627 0, 0, 0, 0, /* pad out to 24 bytes. */ 628 0, 0 629 }; 630 631 static const bfd_byte elf_cpu32_plt_entry[CPU32_PLT_ENTRY_SIZE] = 632 { 633 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */ 634 0, 0, 0, 2, /* + (.got.plt entry) - . */ 635 0x4e, 0xd1, /* jmp %a1@ */ 636 0x2f, 0x3c, /* move.l #offset,-(%sp) */ 637 0, 0, 0, 0, /* + reloc index */ 638 0x60, 0xff, /* bra.l .plt */ 639 0, 0, 0, 0, /* + .plt - . */ 640 0, 0 641 }; 642 643 static const struct elf_m68k_plt_info elf_cpu32_plt_info = { 644 CPU32_PLT_ENTRY_SIZE, 645 elf_cpu32_plt0_entry, { 4, 12 }, 646 elf_cpu32_plt_entry, { 4, 18 }, 10 647 }; 648 649 /* The m68k linker needs to keep track of the number of relocs that it 650 decides to copy in check_relocs for each symbol. This is so that it 651 can discard PC relative relocs if it doesn't need them when linking 652 with -Bsymbolic. We store the information in a field extending the 653 regular ELF linker hash table. */ 654 655 /* This structure keeps track of the number of PC relative relocs we have 656 copied for a given symbol. */ 657 658 struct elf_m68k_pcrel_relocs_copied 659 { 660 /* Next section. */ 661 struct elf_m68k_pcrel_relocs_copied *next; 662 /* A section in dynobj. */ 663 asection *section; 664 /* Number of relocs copied in this section. */ 665 bfd_size_type count; 666 }; 667 668 /* Forward declaration. */ 669 struct elf_m68k_got_entry; 670 671 /* m68k ELF linker hash entry. */ 672 673 struct elf_m68k_link_hash_entry 674 { 675 struct elf_link_hash_entry root; 676 677 /* Number of PC relative relocs copied for this symbol. */ 678 struct elf_m68k_pcrel_relocs_copied *pcrel_relocs_copied; 679 680 /* Key to got_entries. */ 681 unsigned long got_entry_key; 682 683 /* List of GOT entries for this symbol. This list is build during 684 offset finalization and is used within elf_m68k_finish_dynamic_symbol 685 to traverse all GOT entries for a particular symbol. 686 687 ??? We could've used root.got.glist field instead, but having 688 a separate field is cleaner. */ 689 struct elf_m68k_got_entry *glist; 690 }; 691 692 #define elf_m68k_hash_entry(ent) ((struct elf_m68k_link_hash_entry *) (ent)) 693 694 /* Key part of GOT entry in hashtable. */ 695 struct elf_m68k_got_entry_key 696 { 697 /* BFD in which this symbol was defined. NULL for global symbols. */ 698 const bfd *bfd; 699 700 /* Symbol index. Either local symbol index or h->got_entry_key. */ 701 unsigned long symndx; 702 703 /* Type is one of R_68K_GOT{8, 16, 32}O, R_68K_TLS_GD{8, 16, 32}, 704 R_68K_TLS_LDM{8, 16, 32} or R_68K_TLS_IE{8, 16, 32}. 705 706 From perspective of hashtable key, only elf_m68k_got_reloc_type (type) 707 matters. That is, we distinguish between, say, R_68K_GOT16O 708 and R_68K_GOT32O when allocating offsets, but they are considered to be 709 the same when searching got->entries. */ 710 enum elf_m68k_reloc_type type; 711 }; 712 713 /* Size of the GOT offset suitable for relocation. */ 714 enum elf_m68k_got_offset_size { R_8, R_16, R_32, R_LAST }; 715 716 /* Entry of the GOT. */ 717 struct elf_m68k_got_entry 718 { 719 /* GOT entries are put into a got->entries hashtable. This is the key. */ 720 struct elf_m68k_got_entry_key key_; 721 722 /* GOT entry data. We need s1 before offset finalization and s2 after. */ 723 union 724 { 725 struct 726 { 727 /* Number of times this entry is referenced. It is used to 728 filter out unnecessary GOT slots in elf_m68k_gc_sweep_hook. */ 729 bfd_vma refcount; 730 } s1; 731 732 struct 733 { 734 /* Offset from the start of .got section. To calculate offset relative 735 to GOT pointer one should substract got->offset from this value. */ 736 bfd_vma offset; 737 738 /* Pointer to the next GOT entry for this global symbol. 739 Symbols have at most one entry in one GOT, but might 740 have entries in more than one GOT. 741 Root of this list is h->glist. 742 NULL for local symbols. */ 743 struct elf_m68k_got_entry *next; 744 } s2; 745 } u; 746 }; 747 748 /* Return representative type for relocation R_TYPE. 749 This is used to avoid enumerating many relocations in comparisons, 750 switches etc. */ 751 752 static enum elf_m68k_reloc_type 753 elf_m68k_reloc_got_type (enum elf_m68k_reloc_type r_type) 754 { 755 switch (r_type) 756 { 757 /* In most cases R_68K_GOTx relocations require the very same 758 handling as R_68K_GOT32O relocation. In cases when we need 759 to distinguish between the two, we use explicitly compare against 760 r_type. */ 761 case R_68K_GOT32: 762 case R_68K_GOT16: 763 case R_68K_GOT8: 764 case R_68K_GOT32O: 765 case R_68K_GOT16O: 766 case R_68K_GOT8O: 767 return R_68K_GOT32O; 768 769 case R_68K_TLS_GD32: 770 case R_68K_TLS_GD16: 771 case R_68K_TLS_GD8: 772 return R_68K_TLS_GD32; 773 774 case R_68K_TLS_LDM32: 775 case R_68K_TLS_LDM16: 776 case R_68K_TLS_LDM8: 777 return R_68K_TLS_LDM32; 778 779 case R_68K_TLS_IE32: 780 case R_68K_TLS_IE16: 781 case R_68K_TLS_IE8: 782 return R_68K_TLS_IE32; 783 784 default: 785 BFD_ASSERT (FALSE); 786 return 0; 787 } 788 } 789 790 /* Return size of the GOT entry offset for relocation R_TYPE. */ 791 792 static enum elf_m68k_got_offset_size 793 elf_m68k_reloc_got_offset_size (enum elf_m68k_reloc_type r_type) 794 { 795 switch (r_type) 796 { 797 case R_68K_GOT32: case R_68K_GOT16: case R_68K_GOT8: 798 case R_68K_GOT32O: case R_68K_TLS_GD32: case R_68K_TLS_LDM32: 799 case R_68K_TLS_IE32: 800 return R_32; 801 802 case R_68K_GOT16O: case R_68K_TLS_GD16: case R_68K_TLS_LDM16: 803 case R_68K_TLS_IE16: 804 return R_16; 805 806 case R_68K_GOT8O: case R_68K_TLS_GD8: case R_68K_TLS_LDM8: 807 case R_68K_TLS_IE8: 808 return R_8; 809 810 default: 811 BFD_ASSERT (FALSE); 812 return 0; 813 } 814 } 815 816 /* Return number of GOT entries we need to allocate in GOT for 817 relocation R_TYPE. */ 818 819 static bfd_vma 820 elf_m68k_reloc_got_n_slots (enum elf_m68k_reloc_type r_type) 821 { 822 switch (elf_m68k_reloc_got_type (r_type)) 823 { 824 case R_68K_GOT32O: 825 case R_68K_TLS_IE32: 826 return 1; 827 828 case R_68K_TLS_GD32: 829 case R_68K_TLS_LDM32: 830 return 2; 831 832 default: 833 BFD_ASSERT (FALSE); 834 return 0; 835 } 836 } 837 838 /* Return TRUE if relocation R_TYPE is a TLS one. */ 839 840 static bfd_boolean 841 elf_m68k_reloc_tls_p (enum elf_m68k_reloc_type r_type) 842 { 843 switch (r_type) 844 { 845 case R_68K_TLS_GD32: case R_68K_TLS_GD16: case R_68K_TLS_GD8: 846 case R_68K_TLS_LDM32: case R_68K_TLS_LDM16: case R_68K_TLS_LDM8: 847 case R_68K_TLS_LDO32: case R_68K_TLS_LDO16: case R_68K_TLS_LDO8: 848 case R_68K_TLS_IE32: case R_68K_TLS_IE16: case R_68K_TLS_IE8: 849 case R_68K_TLS_LE32: case R_68K_TLS_LE16: case R_68K_TLS_LE8: 850 case R_68K_TLS_DTPMOD32: case R_68K_TLS_DTPREL32: case R_68K_TLS_TPREL32: 851 return TRUE; 852 853 default: 854 return FALSE; 855 } 856 } 857 858 /* Data structure representing a single GOT. */ 859 struct elf_m68k_got 860 { 861 /* Hashtable of 'struct elf_m68k_got_entry's. 862 Starting size of this table is the maximum number of 863 R_68K_GOT8O entries. */ 864 htab_t entries; 865 866 /* Number of R_x slots in this GOT. Some (e.g., TLS) entries require 867 several GOT slots. 868 869 n_slots[R_8] is the count of R_8 slots in this GOT. 870 n_slots[R_16] is the cumulative count of R_8 and R_16 slots 871 in this GOT. 872 n_slots[R_32] is the cumulative count of R_8, R_16 and R_32 slots 873 in this GOT. This is the total number of slots. */ 874 bfd_vma n_slots[R_LAST]; 875 876 /* Number of local (entry->key_.h == NULL) slots in this GOT. 877 This is only used to properly calculate size of .rela.got section; 878 see elf_m68k_partition_multi_got. */ 879 bfd_vma local_n_slots; 880 881 /* Offset of this GOT relative to beginning of .got section. */ 882 bfd_vma offset; 883 }; 884 885 /* BFD and its GOT. This is an entry in multi_got->bfd2got hashtable. */ 886 struct elf_m68k_bfd2got_entry 887 { 888 /* BFD. */ 889 const bfd *bfd; 890 891 /* Assigned GOT. Before partitioning multi-GOT each BFD has its own 892 GOT structure. After partitioning several BFD's might [and often do] 893 share a single GOT. */ 894 struct elf_m68k_got *got; 895 }; 896 897 /* The main data structure holding all the pieces. */ 898 struct elf_m68k_multi_got 899 { 900 /* Hashtable mapping each BFD to its GOT. If a BFD doesn't have an entry 901 here, then it doesn't need a GOT (this includes the case of a BFD 902 having an empty GOT). 903 904 ??? This hashtable can be replaced by an array indexed by bfd->id. */ 905 htab_t bfd2got; 906 907 /* Next symndx to assign a global symbol. 908 h->got_entry_key is initialized from this counter. */ 909 unsigned long global_symndx; 910 }; 911 912 /* m68k ELF linker hash table. */ 913 914 struct elf_m68k_link_hash_table 915 { 916 struct elf_link_hash_table root; 917 918 /* Small local sym cache. */ 919 struct sym_cache sym_cache; 920 921 /* The PLT format used by this link, or NULL if the format has not 922 yet been chosen. */ 923 const struct elf_m68k_plt_info *plt_info; 924 925 /* True, if GP is loaded within each function which uses it. 926 Set to TRUE when GOT negative offsets or multi-GOT is enabled. */ 927 bfd_boolean local_gp_p; 928 929 /* Switch controlling use of negative offsets to double the size of GOTs. */ 930 bfd_boolean use_neg_got_offsets_p; 931 932 /* Switch controlling generation of multiple GOTs. */ 933 bfd_boolean allow_multigot_p; 934 935 /* Multi-GOT data structure. */ 936 struct elf_m68k_multi_got multi_got_; 937 }; 938 939 /* Get the m68k ELF linker hash table from a link_info structure. */ 940 941 #define elf_m68k_hash_table(p) \ 942 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \ 943 == M68K_ELF_DATA ? ((struct elf_m68k_link_hash_table *) ((p)->hash)) : NULL) 944 945 /* Shortcut to multi-GOT data. */ 946 #define elf_m68k_multi_got(INFO) (&elf_m68k_hash_table (INFO)->multi_got_) 947 948 /* Create an entry in an m68k ELF linker hash table. */ 949 950 static struct bfd_hash_entry * 951 elf_m68k_link_hash_newfunc (struct bfd_hash_entry *entry, 952 struct bfd_hash_table *table, 953 const char *string) 954 { 955 struct bfd_hash_entry *ret = entry; 956 957 /* Allocate the structure if it has not already been allocated by a 958 subclass. */ 959 if (ret == NULL) 960 ret = bfd_hash_allocate (table, 961 sizeof (struct elf_m68k_link_hash_entry)); 962 if (ret == NULL) 963 return ret; 964 965 /* Call the allocation method of the superclass. */ 966 ret = _bfd_elf_link_hash_newfunc (ret, table, string); 967 if (ret != NULL) 968 { 969 elf_m68k_hash_entry (ret)->pcrel_relocs_copied = NULL; 970 elf_m68k_hash_entry (ret)->got_entry_key = 0; 971 elf_m68k_hash_entry (ret)->glist = NULL; 972 } 973 974 return ret; 975 } 976 977 /* Create an m68k ELF linker hash table. */ 978 979 static struct bfd_link_hash_table * 980 elf_m68k_link_hash_table_create (bfd *abfd) 981 { 982 struct elf_m68k_link_hash_table *ret; 983 bfd_size_type amt = sizeof (struct elf_m68k_link_hash_table); 984 985 ret = (struct elf_m68k_link_hash_table *) bfd_malloc (amt); 986 if (ret == (struct elf_m68k_link_hash_table *) NULL) 987 return NULL; 988 989 if (!_bfd_elf_link_hash_table_init (&ret->root, abfd, 990 elf_m68k_link_hash_newfunc, 991 sizeof (struct elf_m68k_link_hash_entry), 992 M68K_ELF_DATA)) 993 { 994 free (ret); 995 return NULL; 996 } 997 998 ret->sym_cache.abfd = NULL; 999 ret->plt_info = NULL; 1000 ret->local_gp_p = FALSE; 1001 ret->use_neg_got_offsets_p = FALSE; 1002 ret->allow_multigot_p = FALSE; 1003 ret->multi_got_.bfd2got = NULL; 1004 ret->multi_got_.global_symndx = 1; 1005 1006 return &ret->root.root; 1007 } 1008 1009 /* Destruct local data. */ 1010 1011 static void 1012 elf_m68k_link_hash_table_free (struct bfd_link_hash_table *_htab) 1013 { 1014 struct elf_m68k_link_hash_table *htab; 1015 1016 htab = (struct elf_m68k_link_hash_table *) _htab; 1017 1018 if (htab->multi_got_.bfd2got != NULL) 1019 { 1020 htab_delete (htab->multi_got_.bfd2got); 1021 htab->multi_got_.bfd2got = NULL; 1022 } 1023 } 1024 1025 /* Set the right machine number. */ 1026 1027 static bfd_boolean 1028 elf32_m68k_object_p (bfd *abfd) 1029 { 1030 unsigned int mach = 0; 1031 unsigned features = 0; 1032 flagword eflags = elf_elfheader (abfd)->e_flags; 1033 1034 if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_M68000) 1035 features |= m68000; 1036 else if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32) 1037 features |= cpu32; 1038 else if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO) 1039 features |= fido_a; 1040 else 1041 { 1042 switch (eflags & EF_M68K_CF_ISA_MASK) 1043 { 1044 case EF_M68K_CF_ISA_A_NODIV: 1045 features |= mcfisa_a; 1046 break; 1047 case EF_M68K_CF_ISA_A: 1048 features |= mcfisa_a|mcfhwdiv; 1049 break; 1050 case EF_M68K_CF_ISA_A_PLUS: 1051 features |= mcfisa_a|mcfisa_aa|mcfhwdiv|mcfusp; 1052 break; 1053 case EF_M68K_CF_ISA_B_NOUSP: 1054 features |= mcfisa_a|mcfisa_b|mcfhwdiv; 1055 break; 1056 case EF_M68K_CF_ISA_B: 1057 features |= mcfisa_a|mcfisa_b|mcfhwdiv|mcfusp; 1058 break; 1059 case EF_M68K_CF_ISA_C: 1060 features |= mcfisa_a|mcfisa_c|mcfhwdiv|mcfusp; 1061 break; 1062 case EF_M68K_CF_ISA_C_NODIV: 1063 features |= mcfisa_a|mcfisa_c|mcfusp; 1064 break; 1065 } 1066 switch (eflags & EF_M68K_CF_MAC_MASK) 1067 { 1068 case EF_M68K_CF_MAC: 1069 features |= mcfmac; 1070 break; 1071 case EF_M68K_CF_EMAC: 1072 features |= mcfemac; 1073 break; 1074 } 1075 if (eflags & EF_M68K_CF_FLOAT) 1076 features |= cfloat; 1077 } 1078 1079 mach = bfd_m68k_features_to_mach (features); 1080 bfd_default_set_arch_mach (abfd, bfd_arch_m68k, mach); 1081 1082 return TRUE; 1083 } 1084 1085 /* Somewhat reverse of elf32_m68k_object_p, this sets the e_flag 1086 field based on the machine number. */ 1087 1088 static void 1089 elf_m68k_final_write_processing (bfd *abfd, 1090 bfd_boolean linker ATTRIBUTE_UNUSED) 1091 { 1092 int mach = bfd_get_mach (abfd); 1093 unsigned long e_flags = elf_elfheader (abfd)->e_flags; 1094 1095 if (!e_flags) 1096 { 1097 unsigned int arch_mask; 1098 1099 arch_mask = bfd_m68k_mach_to_features (mach); 1100 1101 if (arch_mask & m68000) 1102 e_flags = EF_M68K_M68000; 1103 else if (arch_mask & cpu32) 1104 e_flags = EF_M68K_CPU32; 1105 else if (arch_mask & fido_a) 1106 e_flags = EF_M68K_FIDO; 1107 else 1108 { 1109 switch (arch_mask 1110 & (mcfisa_a | mcfisa_aa | mcfisa_b | mcfisa_c | mcfhwdiv | mcfusp)) 1111 { 1112 case mcfisa_a: 1113 e_flags |= EF_M68K_CF_ISA_A_NODIV; 1114 break; 1115 case mcfisa_a | mcfhwdiv: 1116 e_flags |= EF_M68K_CF_ISA_A; 1117 break; 1118 case mcfisa_a | mcfisa_aa | mcfhwdiv | mcfusp: 1119 e_flags |= EF_M68K_CF_ISA_A_PLUS; 1120 break; 1121 case mcfisa_a | mcfisa_b | mcfhwdiv: 1122 e_flags |= EF_M68K_CF_ISA_B_NOUSP; 1123 break; 1124 case mcfisa_a | mcfisa_b | mcfhwdiv | mcfusp: 1125 e_flags |= EF_M68K_CF_ISA_B; 1126 break; 1127 case mcfisa_a | mcfisa_c | mcfhwdiv | mcfusp: 1128 e_flags |= EF_M68K_CF_ISA_C; 1129 break; 1130 case mcfisa_a | mcfisa_c | mcfusp: 1131 e_flags |= EF_M68K_CF_ISA_C_NODIV; 1132 break; 1133 } 1134 if (arch_mask & mcfmac) 1135 e_flags |= EF_M68K_CF_MAC; 1136 else if (arch_mask & mcfemac) 1137 e_flags |= EF_M68K_CF_EMAC; 1138 if (arch_mask & cfloat) 1139 e_flags |= EF_M68K_CF_FLOAT | EF_M68K_CFV4E; 1140 } 1141 elf_elfheader (abfd)->e_flags = e_flags; 1142 } 1143 } 1144 1145 /* Keep m68k-specific flags in the ELF header. */ 1146 1147 static bfd_boolean 1148 elf32_m68k_set_private_flags (abfd, flags) 1149 bfd *abfd; 1150 flagword flags; 1151 { 1152 elf_elfheader (abfd)->e_flags = flags; 1153 elf_flags_init (abfd) = TRUE; 1154 return TRUE; 1155 } 1156 1157 /* Merge backend specific data from an object file to the output 1158 object file when linking. */ 1159 static bfd_boolean 1160 elf32_m68k_merge_private_bfd_data (ibfd, obfd) 1161 bfd *ibfd; 1162 bfd *obfd; 1163 { 1164 flagword out_flags; 1165 flagword in_flags; 1166 flagword out_isa; 1167 flagword in_isa; 1168 const bfd_arch_info_type *arch_info; 1169 1170 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour 1171 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 1172 return FALSE; 1173 1174 /* Get the merged machine. This checks for incompatibility between 1175 Coldfire & non-Coldfire flags, incompability between different 1176 Coldfire ISAs, and incompability between different MAC types. */ 1177 arch_info = bfd_arch_get_compatible (ibfd, obfd, FALSE); 1178 if (!arch_info) 1179 return FALSE; 1180 1181 bfd_set_arch_mach (obfd, bfd_arch_m68k, arch_info->mach); 1182 1183 in_flags = elf_elfheader (ibfd)->e_flags; 1184 if (!elf_flags_init (obfd)) 1185 { 1186 elf_flags_init (obfd) = TRUE; 1187 out_flags = in_flags; 1188 } 1189 else 1190 { 1191 out_flags = elf_elfheader (obfd)->e_flags; 1192 unsigned int variant_mask; 1193 1194 if ((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_M68000) 1195 variant_mask = 0; 1196 else if ((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32) 1197 variant_mask = 0; 1198 else if ((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO) 1199 variant_mask = 0; 1200 else 1201 variant_mask = EF_M68K_CF_ISA_MASK; 1202 1203 in_isa = (in_flags & variant_mask); 1204 out_isa = (out_flags & variant_mask); 1205 if (in_isa > out_isa) 1206 out_flags ^= in_isa ^ out_isa; 1207 if (((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32 1208 && (out_flags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO) 1209 || ((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO 1210 && (out_flags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32)) 1211 out_flags = EF_M68K_FIDO; 1212 else 1213 out_flags |= in_flags ^ in_isa; 1214 } 1215 elf_elfheader (obfd)->e_flags = out_flags; 1216 1217 return TRUE; 1218 } 1219 1220 /* Display the flags field. */ 1221 1222 static bfd_boolean 1223 elf32_m68k_print_private_bfd_data (bfd *abfd, void * ptr) 1224 { 1225 FILE *file = (FILE *) ptr; 1226 flagword eflags = elf_elfheader (abfd)->e_flags; 1227 1228 BFD_ASSERT (abfd != NULL && ptr != NULL); 1229 1230 /* Print normal ELF private data. */ 1231 _bfd_elf_print_private_bfd_data (abfd, ptr); 1232 1233 /* Ignore init flag - it may not be set, despite the flags field containing valid data. */ 1234 1235 /* xgettext:c-format */ 1236 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); 1237 1238 if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_M68000) 1239 fprintf (file, " [m68000]"); 1240 else if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32) 1241 fprintf (file, " [cpu32]"); 1242 else if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO) 1243 fprintf (file, " [fido]"); 1244 else 1245 { 1246 if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_CFV4E) 1247 fprintf (file, " [cfv4e]"); 1248 1249 if (eflags & EF_M68K_CF_ISA_MASK) 1250 { 1251 char const *isa = _("unknown"); 1252 char const *mac = _("unknown"); 1253 char const *additional = ""; 1254 1255 switch (eflags & EF_M68K_CF_ISA_MASK) 1256 { 1257 case EF_M68K_CF_ISA_A_NODIV: 1258 isa = "A"; 1259 additional = " [nodiv]"; 1260 break; 1261 case EF_M68K_CF_ISA_A: 1262 isa = "A"; 1263 break; 1264 case EF_M68K_CF_ISA_A_PLUS: 1265 isa = "A+"; 1266 break; 1267 case EF_M68K_CF_ISA_B_NOUSP: 1268 isa = "B"; 1269 additional = " [nousp]"; 1270 break; 1271 case EF_M68K_CF_ISA_B: 1272 isa = "B"; 1273 break; 1274 case EF_M68K_CF_ISA_C: 1275 isa = "C"; 1276 break; 1277 case EF_M68K_CF_ISA_C_NODIV: 1278 isa = "C"; 1279 additional = " [nodiv]"; 1280 break; 1281 } 1282 fprintf (file, " [isa %s]%s", isa, additional); 1283 1284 if (eflags & EF_M68K_CF_FLOAT) 1285 fprintf (file, " [float]"); 1286 1287 switch (eflags & EF_M68K_CF_MAC_MASK) 1288 { 1289 case 0: 1290 mac = NULL; 1291 break; 1292 case EF_M68K_CF_MAC: 1293 mac = "mac"; 1294 break; 1295 case EF_M68K_CF_EMAC: 1296 mac = "emac"; 1297 break; 1298 case EF_M68K_CF_EMAC_B: 1299 mac = "emac_b"; 1300 break; 1301 } 1302 if (mac) 1303 fprintf (file, " [%s]", mac); 1304 } 1305 } 1306 1307 fputc ('\n', file); 1308 1309 return TRUE; 1310 } 1311 1312 /* Multi-GOT support implementation design: 1313 1314 Multi-GOT starts in check_relocs hook. There we scan all 1315 relocations of a BFD and build a local GOT (struct elf_m68k_got) 1316 for it. If a single BFD appears to require too many GOT slots with 1317 R_68K_GOT8O or R_68K_GOT16O relocations, we fail with notification 1318 to user. 1319 After check_relocs has been invoked for each input BFD, we have 1320 constructed a GOT for each input BFD. 1321 1322 To minimize total number of GOTs required for a particular output BFD 1323 (as some environments support only 1 GOT per output object) we try 1324 to merge some of the GOTs to share an offset space. Ideally [and in most 1325 cases] we end up with a single GOT. In cases when there are too many 1326 restricted relocations (e.g., R_68K_GOT16O relocations) we end up with 1327 several GOTs, assuming the environment can handle them. 1328 1329 Partitioning is done in elf_m68k_partition_multi_got. We start with 1330 an empty GOT and traverse bfd2got hashtable putting got_entries from 1331 local GOTs to the new 'big' one. We do that by constructing an 1332 intermediate GOT holding all the entries the local GOT has and the big 1333 GOT lacks. Then we check if there is room in the big GOT to accomodate 1334 all the entries from diff. On success we add those entries to the big 1335 GOT; on failure we start the new 'big' GOT and retry the adding of 1336 entries from the local GOT. Note that this retry will always succeed as 1337 each local GOT doesn't overflow the limits. After partitioning we 1338 end up with each bfd assigned one of the big GOTs. GOT entries in the 1339 big GOTs are initialized with GOT offsets. Note that big GOTs are 1340 positioned consequently in program space and represent a single huge GOT 1341 to the outside world. 1342 1343 After that we get to elf_m68k_relocate_section. There we 1344 adjust relocations of GOT pointer (_GLOBAL_OFFSET_TABLE_) and symbol 1345 relocations to refer to appropriate [assigned to current input_bfd] 1346 big GOT. 1347 1348 Notes: 1349 1350 GOT entry type: We have several types of GOT entries. 1351 * R_8 type is used in entries for symbols that have at least one 1352 R_68K_GOT8O or R_68K_TLS_*8 relocation. We can have at most 0x40 1353 such entries in one GOT. 1354 * R_16 type is used in entries for symbols that have at least one 1355 R_68K_GOT16O or R_68K_TLS_*16 relocation and no R_8 relocations. 1356 We can have at most 0x4000 such entries in one GOT. 1357 * R_32 type is used in all other cases. We can have as many 1358 such entries in one GOT as we'd like. 1359 When counting relocations we have to include the count of the smaller 1360 ranged relocations in the counts of the larger ranged ones in order 1361 to correctly detect overflow. 1362 1363 Sorting the GOT: In each GOT starting offsets are assigned to 1364 R_8 entries, which are followed by R_16 entries, and 1365 R_32 entries go at the end. See finalize_got_offsets for details. 1366 1367 Negative GOT offsets: To double usable offset range of GOTs we use 1368 negative offsets. As we assign entries with GOT offsets relative to 1369 start of .got section, the offset values are positive. They become 1370 negative only in relocate_section where got->offset value is 1371 subtracted from them. 1372 1373 3 special GOT entries: There are 3 special GOT entries used internally 1374 by loader. These entries happen to be placed to .got.plt section, 1375 so we don't do anything about them in multi-GOT support. 1376 1377 Memory management: All data except for hashtables 1378 multi_got->bfd2got and got->entries are allocated on 1379 elf_hash_table (info)->dynobj bfd (for this reason we pass 'info' 1380 to most functions), so we don't need to care to free them. At the 1381 moment of allocation hashtables are being linked into main data 1382 structure (multi_got), all pieces of which are reachable from 1383 elf_m68k_multi_got (info). We deallocate them in 1384 elf_m68k_link_hash_table_free. */ 1385 1386 /* Initialize GOT. */ 1387 1388 static void 1389 elf_m68k_init_got (struct elf_m68k_got *got) 1390 { 1391 got->entries = NULL; 1392 got->n_slots[R_8] = 0; 1393 got->n_slots[R_16] = 0; 1394 got->n_slots[R_32] = 0; 1395 got->local_n_slots = 0; 1396 got->offset = (bfd_vma) -1; 1397 } 1398 1399 /* Destruct GOT. */ 1400 1401 static void 1402 elf_m68k_clear_got (struct elf_m68k_got *got) 1403 { 1404 if (got->entries != NULL) 1405 { 1406 htab_delete (got->entries); 1407 got->entries = NULL; 1408 } 1409 } 1410 1411 /* Create and empty GOT structure. INFO is the context where memory 1412 should be allocated. */ 1413 1414 static struct elf_m68k_got * 1415 elf_m68k_create_empty_got (struct bfd_link_info *info) 1416 { 1417 struct elf_m68k_got *got; 1418 1419 got = bfd_alloc (elf_hash_table (info)->dynobj, sizeof (*got)); 1420 if (got == NULL) 1421 return NULL; 1422 1423 elf_m68k_init_got (got); 1424 1425 return got; 1426 } 1427 1428 /* Initialize KEY. */ 1429 1430 static void 1431 elf_m68k_init_got_entry_key (struct elf_m68k_got_entry_key *key, 1432 struct elf_link_hash_entry *h, 1433 const bfd *abfd, unsigned long symndx, 1434 enum elf_m68k_reloc_type reloc_type) 1435 { 1436 if (elf_m68k_reloc_got_type (reloc_type) == R_68K_TLS_LDM32) 1437 /* All TLS_LDM relocations share a single GOT entry. */ 1438 { 1439 key->bfd = NULL; 1440 key->symndx = 0; 1441 } 1442 else if (h != NULL) 1443 /* Global symbols are identified with their got_entry_key. */ 1444 { 1445 key->bfd = NULL; 1446 key->symndx = elf_m68k_hash_entry (h)->got_entry_key; 1447 BFD_ASSERT (key->symndx != 0); 1448 } 1449 else 1450 /* Local symbols are identified by BFD they appear in and symndx. */ 1451 { 1452 key->bfd = abfd; 1453 key->symndx = symndx; 1454 } 1455 1456 key->type = reloc_type; 1457 } 1458 1459 /* Calculate hash of got_entry. 1460 ??? Is it good? */ 1461 1462 static hashval_t 1463 elf_m68k_got_entry_hash (const void *_entry) 1464 { 1465 const struct elf_m68k_got_entry_key *key; 1466 1467 key = &((const struct elf_m68k_got_entry *) _entry)->key_; 1468 1469 return (key->symndx 1470 + (key->bfd != NULL ? (int) key->bfd->id : -1) 1471 + elf_m68k_reloc_got_type (key->type)); 1472 } 1473 1474 /* Check if two got entries are equal. */ 1475 1476 static int 1477 elf_m68k_got_entry_eq (const void *_entry1, const void *_entry2) 1478 { 1479 const struct elf_m68k_got_entry_key *key1; 1480 const struct elf_m68k_got_entry_key *key2; 1481 1482 key1 = &((const struct elf_m68k_got_entry *) _entry1)->key_; 1483 key2 = &((const struct elf_m68k_got_entry *) _entry2)->key_; 1484 1485 return (key1->bfd == key2->bfd 1486 && key1->symndx == key2->symndx 1487 && (elf_m68k_reloc_got_type (key1->type) 1488 == elf_m68k_reloc_got_type (key2->type))); 1489 } 1490 1491 /* When using negative offsets, we allocate one extra R_8, one extra R_16 1492 and one extra R_32 slots to simplify handling of 2-slot entries during 1493 offset allocation -- hence -1 for R_8 slots and -2 for R_16 slots. */ 1494 1495 /* Maximal number of R_8 slots in a single GOT. */ 1496 #define ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT(INFO) \ 1497 (elf_m68k_hash_table (INFO)->use_neg_got_offsets_p \ 1498 ? (0x40 - 1) \ 1499 : 0x20) 1500 1501 /* Maximal number of R_8 and R_16 slots in a single GOT. */ 1502 #define ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT(INFO) \ 1503 (elf_m68k_hash_table (INFO)->use_neg_got_offsets_p \ 1504 ? (0x4000 - 2) \ 1505 : 0x2000) 1506 1507 /* SEARCH - simply search the hashtable, don't insert new entries or fail when 1508 the entry cannot be found. 1509 FIND_OR_CREATE - search for an existing entry, but create new if there's 1510 no such. 1511 MUST_FIND - search for an existing entry and assert that it exist. 1512 MUST_CREATE - assert that there's no such entry and create new one. */ 1513 enum elf_m68k_get_entry_howto 1514 { 1515 SEARCH, 1516 FIND_OR_CREATE, 1517 MUST_FIND, 1518 MUST_CREATE 1519 }; 1520 1521 /* Get or create (depending on HOWTO) entry with KEY in GOT. 1522 INFO is context in which memory should be allocated (can be NULL if 1523 HOWTO is SEARCH or MUST_FIND). */ 1524 1525 static struct elf_m68k_got_entry * 1526 elf_m68k_get_got_entry (struct elf_m68k_got *got, 1527 const struct elf_m68k_got_entry_key *key, 1528 enum elf_m68k_get_entry_howto howto, 1529 struct bfd_link_info *info) 1530 { 1531 struct elf_m68k_got_entry entry_; 1532 struct elf_m68k_got_entry *entry; 1533 void **ptr; 1534 1535 BFD_ASSERT ((info == NULL) == (howto == SEARCH || howto == MUST_FIND)); 1536 1537 if (got->entries == NULL) 1538 /* This is the first entry in ABFD. Initialize hashtable. */ 1539 { 1540 if (howto == SEARCH) 1541 return NULL; 1542 1543 got->entries = htab_try_create (ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT 1544 (info), 1545 elf_m68k_got_entry_hash, 1546 elf_m68k_got_entry_eq, NULL); 1547 if (got->entries == NULL) 1548 { 1549 bfd_set_error (bfd_error_no_memory); 1550 return NULL; 1551 } 1552 } 1553 1554 entry_.key_ = *key; 1555 ptr = htab_find_slot (got->entries, &entry_, (howto != SEARCH 1556 ? INSERT : NO_INSERT)); 1557 if (ptr == NULL) 1558 { 1559 if (howto == SEARCH) 1560 /* Entry not found. */ 1561 return NULL; 1562 1563 /* We're out of memory. */ 1564 bfd_set_error (bfd_error_no_memory); 1565 return NULL; 1566 } 1567 1568 if (*ptr == NULL) 1569 /* We didn't find the entry and we're asked to create a new one. */ 1570 { 1571 BFD_ASSERT (howto != MUST_FIND && howto != SEARCH); 1572 1573 entry = bfd_alloc (elf_hash_table (info)->dynobj, sizeof (*entry)); 1574 if (entry == NULL) 1575 return NULL; 1576 1577 /* Initialize new entry. */ 1578 entry->key_ = *key; 1579 1580 entry->u.s1.refcount = 0; 1581 1582 /* Mark the entry as not initialized. */ 1583 entry->key_.type = R_68K_max; 1584 1585 *ptr = entry; 1586 } 1587 else 1588 /* We found the entry. */ 1589 { 1590 BFD_ASSERT (howto != MUST_CREATE); 1591 1592 entry = *ptr; 1593 } 1594 1595 return entry; 1596 } 1597 1598 /* Update GOT counters when merging entry of WAS type with entry of NEW type. 1599 Return the value to which ENTRY's type should be set. */ 1600 1601 static enum elf_m68k_reloc_type 1602 elf_m68k_update_got_entry_type (struct elf_m68k_got *got, 1603 enum elf_m68k_reloc_type was, 1604 enum elf_m68k_reloc_type new_reloc) 1605 { 1606 enum elf_m68k_got_offset_size was_size; 1607 enum elf_m68k_got_offset_size new_size; 1608 bfd_vma n_slots; 1609 1610 if (was == R_68K_max) 1611 /* The type of the entry is not initialized yet. */ 1612 { 1613 /* Update all got->n_slots counters, including n_slots[R_32]. */ 1614 was_size = R_LAST; 1615 1616 was = new_reloc; 1617 } 1618 else 1619 { 1620 /* !!! We, probably, should emit an error rather then fail on assert 1621 in such a case. */ 1622 BFD_ASSERT (elf_m68k_reloc_got_type (was) 1623 == elf_m68k_reloc_got_type (new_reloc)); 1624 1625 was_size = elf_m68k_reloc_got_offset_size (was); 1626 } 1627 1628 new_size = elf_m68k_reloc_got_offset_size (new_reloc); 1629 n_slots = elf_m68k_reloc_got_n_slots (new_reloc); 1630 1631 while (was_size > new_size) 1632 { 1633 --was_size; 1634 got->n_slots[was_size] += n_slots; 1635 } 1636 1637 if (new_reloc > was) 1638 /* Relocations are ordered from bigger got offset size to lesser, 1639 so choose the relocation type with lesser offset size. */ 1640 was = new_reloc; 1641 1642 return was; 1643 } 1644 1645 /* Update GOT counters when removing an entry of type TYPE. */ 1646 1647 static void 1648 elf_m68k_remove_got_entry_type (struct elf_m68k_got *got, 1649 enum elf_m68k_reloc_type type) 1650 { 1651 enum elf_m68k_got_offset_size os; 1652 bfd_vma n_slots; 1653 1654 n_slots = elf_m68k_reloc_got_n_slots (type); 1655 1656 /* Decrese counter of slots with offset size corresponding to TYPE 1657 and all greater offset sizes. */ 1658 for (os = elf_m68k_reloc_got_offset_size (type); os <= R_32; ++os) 1659 { 1660 BFD_ASSERT (got->n_slots[os] >= n_slots); 1661 1662 got->n_slots[os] -= n_slots; 1663 } 1664 } 1665 1666 /* Add new or update existing entry to GOT. 1667 H, ABFD, TYPE and SYMNDX is data for the entry. 1668 INFO is a context where memory should be allocated. */ 1669 1670 static struct elf_m68k_got_entry * 1671 elf_m68k_add_entry_to_got (struct elf_m68k_got *got, 1672 struct elf_link_hash_entry *h, 1673 const bfd *abfd, 1674 enum elf_m68k_reloc_type reloc_type, 1675 unsigned long symndx, 1676 struct bfd_link_info *info) 1677 { 1678 struct elf_m68k_got_entry_key key_; 1679 struct elf_m68k_got_entry *entry; 1680 1681 if (h != NULL && elf_m68k_hash_entry (h)->got_entry_key == 0) 1682 elf_m68k_hash_entry (h)->got_entry_key 1683 = elf_m68k_multi_got (info)->global_symndx++; 1684 1685 elf_m68k_init_got_entry_key (&key_, h, abfd, symndx, reloc_type); 1686 1687 entry = elf_m68k_get_got_entry (got, &key_, FIND_OR_CREATE, info); 1688 if (entry == NULL) 1689 return NULL; 1690 1691 /* Determine entry's type and update got->n_slots counters. */ 1692 entry->key_.type = elf_m68k_update_got_entry_type (got, 1693 entry->key_.type, 1694 reloc_type); 1695 1696 /* Update refcount. */ 1697 ++entry->u.s1.refcount; 1698 1699 if (entry->u.s1.refcount == 1) 1700 /* We see this entry for the first time. */ 1701 { 1702 if (entry->key_.bfd != NULL) 1703 got->local_n_slots += elf_m68k_reloc_got_n_slots (entry->key_.type); 1704 } 1705 1706 BFD_ASSERT (got->n_slots[R_32] >= got->local_n_slots); 1707 1708 if ((got->n_slots[R_8] 1709 > ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info)) 1710 || (got->n_slots[R_16] 1711 > ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT (info))) 1712 /* This BFD has too many relocation. */ 1713 { 1714 if (got->n_slots[R_8] > ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info)) 1715 (*_bfd_error_handler) (_("%B: GOT overflow: " 1716 "Number of relocations with 8-bit " 1717 "offset > %d"), 1718 abfd, 1719 ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info)); 1720 else 1721 (*_bfd_error_handler) (_("%B: GOT overflow: " 1722 "Number of relocations with 8- or 16-bit " 1723 "offset > %d"), 1724 abfd, 1725 ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT (info)); 1726 1727 return NULL; 1728 } 1729 1730 return entry; 1731 } 1732 1733 /* Compute the hash value of the bfd in a bfd2got hash entry. */ 1734 1735 static hashval_t 1736 elf_m68k_bfd2got_entry_hash (const void *entry) 1737 { 1738 const struct elf_m68k_bfd2got_entry *e; 1739 1740 e = (const struct elf_m68k_bfd2got_entry *) entry; 1741 1742 return e->bfd->id; 1743 } 1744 1745 /* Check whether two hash entries have the same bfd. */ 1746 1747 static int 1748 elf_m68k_bfd2got_entry_eq (const void *entry1, const void *entry2) 1749 { 1750 const struct elf_m68k_bfd2got_entry *e1; 1751 const struct elf_m68k_bfd2got_entry *e2; 1752 1753 e1 = (const struct elf_m68k_bfd2got_entry *) entry1; 1754 e2 = (const struct elf_m68k_bfd2got_entry *) entry2; 1755 1756 return e1->bfd == e2->bfd; 1757 } 1758 1759 /* Destruct a bfd2got entry. */ 1760 1761 static void 1762 elf_m68k_bfd2got_entry_del (void *_entry) 1763 { 1764 struct elf_m68k_bfd2got_entry *entry; 1765 1766 entry = (struct elf_m68k_bfd2got_entry *) _entry; 1767 1768 BFD_ASSERT (entry->got != NULL); 1769 elf_m68k_clear_got (entry->got); 1770 } 1771 1772 /* Find existing or create new (depending on HOWTO) bfd2got entry in 1773 MULTI_GOT. ABFD is the bfd we need a GOT for. INFO is a context where 1774 memory should be allocated. */ 1775 1776 static struct elf_m68k_bfd2got_entry * 1777 elf_m68k_get_bfd2got_entry (struct elf_m68k_multi_got *multi_got, 1778 const bfd *abfd, 1779 enum elf_m68k_get_entry_howto howto, 1780 struct bfd_link_info *info) 1781 { 1782 struct elf_m68k_bfd2got_entry entry_; 1783 void **ptr; 1784 struct elf_m68k_bfd2got_entry *entry; 1785 1786 BFD_ASSERT ((info == NULL) == (howto == SEARCH || howto == MUST_FIND)); 1787 1788 if (multi_got->bfd2got == NULL) 1789 /* This is the first GOT. Initialize bfd2got. */ 1790 { 1791 if (howto == SEARCH) 1792 return NULL; 1793 1794 multi_got->bfd2got = htab_try_create (1, elf_m68k_bfd2got_entry_hash, 1795 elf_m68k_bfd2got_entry_eq, 1796 elf_m68k_bfd2got_entry_del); 1797 if (multi_got->bfd2got == NULL) 1798 { 1799 bfd_set_error (bfd_error_no_memory); 1800 return NULL; 1801 } 1802 } 1803 1804 entry_.bfd = abfd; 1805 ptr = htab_find_slot (multi_got->bfd2got, &entry_, (howto != SEARCH 1806 ? INSERT : NO_INSERT)); 1807 if (ptr == NULL) 1808 { 1809 if (howto == SEARCH) 1810 /* Entry not found. */ 1811 return NULL; 1812 1813 /* We're out of memory. */ 1814 bfd_set_error (bfd_error_no_memory); 1815 return NULL; 1816 } 1817 1818 if (*ptr == NULL) 1819 /* Entry was not found. Create new one. */ 1820 { 1821 BFD_ASSERT (howto != MUST_FIND && howto != SEARCH); 1822 1823 entry = ((struct elf_m68k_bfd2got_entry *) 1824 bfd_alloc (elf_hash_table (info)->dynobj, sizeof (*entry))); 1825 if (entry == NULL) 1826 return NULL; 1827 1828 entry->bfd = abfd; 1829 1830 entry->got = elf_m68k_create_empty_got (info); 1831 if (entry->got == NULL) 1832 return NULL; 1833 1834 *ptr = entry; 1835 } 1836 else 1837 { 1838 BFD_ASSERT (howto != MUST_CREATE); 1839 1840 /* Return existing entry. */ 1841 entry = *ptr; 1842 } 1843 1844 return entry; 1845 } 1846 1847 struct elf_m68k_can_merge_gots_arg 1848 { 1849 /* A current_got that we constructing a DIFF against. */ 1850 struct elf_m68k_got *big; 1851 1852 /* GOT holding entries not present or that should be changed in 1853 BIG. */ 1854 struct elf_m68k_got *diff; 1855 1856 /* Context where to allocate memory. */ 1857 struct bfd_link_info *info; 1858 1859 /* Error flag. */ 1860 bfd_boolean error_p; 1861 }; 1862 1863 /* Process a single entry from the small GOT to see if it should be added 1864 or updated in the big GOT. */ 1865 1866 static int 1867 elf_m68k_can_merge_gots_1 (void **_entry_ptr, void *_arg) 1868 { 1869 const struct elf_m68k_got_entry *entry1; 1870 struct elf_m68k_can_merge_gots_arg *arg; 1871 const struct elf_m68k_got_entry *entry2; 1872 enum elf_m68k_reloc_type type; 1873 1874 entry1 = (const struct elf_m68k_got_entry *) *_entry_ptr; 1875 arg = (struct elf_m68k_can_merge_gots_arg *) _arg; 1876 1877 entry2 = elf_m68k_get_got_entry (arg->big, &entry1->key_, SEARCH, NULL); 1878 1879 if (entry2 != NULL) 1880 /* We found an existing entry. Check if we should update it. */ 1881 { 1882 type = elf_m68k_update_got_entry_type (arg->diff, 1883 entry2->key_.type, 1884 entry1->key_.type); 1885 1886 if (type == entry2->key_.type) 1887 /* ENTRY1 doesn't update data in ENTRY2. Skip it. 1888 To skip creation of difference entry we use the type, 1889 which we won't see in GOT entries for sure. */ 1890 type = R_68K_max; 1891 } 1892 else 1893 /* We didn't find the entry. Add entry1 to DIFF. */ 1894 { 1895 BFD_ASSERT (entry1->key_.type != R_68K_max); 1896 1897 type = elf_m68k_update_got_entry_type (arg->diff, 1898 R_68K_max, entry1->key_.type); 1899 1900 if (entry1->key_.bfd != NULL) 1901 arg->diff->local_n_slots += elf_m68k_reloc_got_n_slots (type); 1902 } 1903 1904 if (type != R_68K_max) 1905 /* Create an entry in DIFF. */ 1906 { 1907 struct elf_m68k_got_entry *entry; 1908 1909 entry = elf_m68k_get_got_entry (arg->diff, &entry1->key_, MUST_CREATE, 1910 arg->info); 1911 if (entry == NULL) 1912 { 1913 arg->error_p = TRUE; 1914 return 0; 1915 } 1916 1917 entry->key_.type = type; 1918 } 1919 1920 return 1; 1921 } 1922 1923 /* Return TRUE if SMALL GOT can be added to BIG GOT without overflowing it. 1924 Construct DIFF GOT holding the entries which should be added or updated 1925 in BIG GOT to accumulate information from SMALL. 1926 INFO is the context where memory should be allocated. */ 1927 1928 static bfd_boolean 1929 elf_m68k_can_merge_gots (struct elf_m68k_got *big, 1930 const struct elf_m68k_got *small, 1931 struct bfd_link_info *info, 1932 struct elf_m68k_got *diff) 1933 { 1934 struct elf_m68k_can_merge_gots_arg arg_; 1935 1936 BFD_ASSERT (small->offset == (bfd_vma) -1); 1937 1938 arg_.big = big; 1939 arg_.diff = diff; 1940 arg_.info = info; 1941 arg_.error_p = FALSE; 1942 htab_traverse_noresize (small->entries, elf_m68k_can_merge_gots_1, &arg_); 1943 if (arg_.error_p) 1944 { 1945 diff->offset = 0; 1946 return FALSE; 1947 } 1948 1949 /* Check for overflow. */ 1950 if ((big->n_slots[R_8] + arg_.diff->n_slots[R_8] 1951 > ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info)) 1952 || (big->n_slots[R_16] + arg_.diff->n_slots[R_16] 1953 > ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT (info))) 1954 return FALSE; 1955 1956 return TRUE; 1957 } 1958 1959 struct elf_m68k_merge_gots_arg 1960 { 1961 /* The BIG got. */ 1962 struct elf_m68k_got *big; 1963 1964 /* Context where memory should be allocated. */ 1965 struct bfd_link_info *info; 1966 1967 /* Error flag. */ 1968 bfd_boolean error_p; 1969 }; 1970 1971 /* Process a single entry from DIFF got. Add or update corresponding 1972 entry in the BIG got. */ 1973 1974 static int 1975 elf_m68k_merge_gots_1 (void **entry_ptr, void *_arg) 1976 { 1977 const struct elf_m68k_got_entry *from; 1978 struct elf_m68k_merge_gots_arg *arg; 1979 struct elf_m68k_got_entry *to; 1980 1981 from = (const struct elf_m68k_got_entry *) *entry_ptr; 1982 arg = (struct elf_m68k_merge_gots_arg *) _arg; 1983 1984 to = elf_m68k_get_got_entry (arg->big, &from->key_, FIND_OR_CREATE, 1985 arg->info); 1986 if (to == NULL) 1987 { 1988 arg->error_p = TRUE; 1989 return 0; 1990 } 1991 1992 BFD_ASSERT (to->u.s1.refcount == 0); 1993 /* All we need to merge is TYPE. */ 1994 to->key_.type = from->key_.type; 1995 1996 return 1; 1997 } 1998 1999 /* Merge data from DIFF to BIG. INFO is context where memory should be 2000 allocated. */ 2001 2002 static bfd_boolean 2003 elf_m68k_merge_gots (struct elf_m68k_got *big, 2004 struct elf_m68k_got *diff, 2005 struct bfd_link_info *info) 2006 { 2007 if (diff->entries != NULL) 2008 /* DIFF is not empty. Merge it into BIG GOT. */ 2009 { 2010 struct elf_m68k_merge_gots_arg arg_; 2011 2012 /* Merge entries. */ 2013 arg_.big = big; 2014 arg_.info = info; 2015 arg_.error_p = FALSE; 2016 htab_traverse_noresize (diff->entries, elf_m68k_merge_gots_1, &arg_); 2017 if (arg_.error_p) 2018 return FALSE; 2019 2020 /* Merge counters. */ 2021 big->n_slots[R_8] += diff->n_slots[R_8]; 2022 big->n_slots[R_16] += diff->n_slots[R_16]; 2023 big->n_slots[R_32] += diff->n_slots[R_32]; 2024 big->local_n_slots += diff->local_n_slots; 2025 } 2026 else 2027 /* DIFF is empty. */ 2028 { 2029 BFD_ASSERT (diff->n_slots[R_8] == 0); 2030 BFD_ASSERT (diff->n_slots[R_16] == 0); 2031 BFD_ASSERT (diff->n_slots[R_32] == 0); 2032 BFD_ASSERT (diff->local_n_slots == 0); 2033 } 2034 2035 BFD_ASSERT (!elf_m68k_hash_table (info)->allow_multigot_p 2036 || ((big->n_slots[R_8] 2037 <= ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info)) 2038 && (big->n_slots[R_16] 2039 <= ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT (info)))); 2040 2041 return TRUE; 2042 } 2043 2044 struct elf_m68k_finalize_got_offsets_arg 2045 { 2046 /* Ranges of the offsets for GOT entries. 2047 R_x entries receive offsets between offset1[R_x] and offset2[R_x]. 2048 R_x is R_8, R_16 and R_32. */ 2049 bfd_vma *offset1; 2050 bfd_vma *offset2; 2051 2052 /* Mapping from global symndx to global symbols. 2053 This is used to build lists of got entries for global symbols. */ 2054 struct elf_m68k_link_hash_entry **symndx2h; 2055 2056 bfd_vma n_ldm_entries; 2057 }; 2058 2059 /* Assign ENTRY an offset. Build list of GOT entries for global symbols 2060 along the way. */ 2061 2062 static int 2063 elf_m68k_finalize_got_offsets_1 (void **entry_ptr, void *_arg) 2064 { 2065 struct elf_m68k_got_entry *entry; 2066 struct elf_m68k_finalize_got_offsets_arg *arg; 2067 2068 enum elf_m68k_got_offset_size got_offset_size; 2069 bfd_vma entry_size; 2070 2071 entry = (struct elf_m68k_got_entry *) *entry_ptr; 2072 arg = (struct elf_m68k_finalize_got_offsets_arg *) _arg; 2073 2074 /* This should be a fresh entry created in elf_m68k_can_merge_gots. */ 2075 BFD_ASSERT (entry->u.s1.refcount == 0); 2076 2077 /* Get GOT offset size for the entry . */ 2078 got_offset_size = elf_m68k_reloc_got_offset_size (entry->key_.type); 2079 2080 /* Calculate entry size in bytes. */ 2081 entry_size = 4 * elf_m68k_reloc_got_n_slots (entry->key_.type); 2082 2083 /* Check if we should switch to negative range of the offsets. */ 2084 if (arg->offset1[got_offset_size] + entry_size 2085 > arg->offset2[got_offset_size]) 2086 { 2087 /* Verify that this is the only switch to negative range for 2088 got_offset_size. If this assertion fails, then we've miscalculated 2089 range for got_offset_size entries in 2090 elf_m68k_finalize_got_offsets. */ 2091 BFD_ASSERT (arg->offset2[got_offset_size] 2092 != arg->offset2[-(int) got_offset_size - 1]); 2093 2094 /* Switch. */ 2095 arg->offset1[got_offset_size] = arg->offset1[-(int) got_offset_size - 1]; 2096 arg->offset2[got_offset_size] = arg->offset2[-(int) got_offset_size - 1]; 2097 2098 /* Verify that now we have enough room for the entry. */ 2099 BFD_ASSERT (arg->offset1[got_offset_size] + entry_size 2100 <= arg->offset2[got_offset_size]); 2101 } 2102 2103 /* Assign offset to entry. */ 2104 entry->u.s2.offset = arg->offset1[got_offset_size]; 2105 arg->offset1[got_offset_size] += entry_size; 2106 2107 if (entry->key_.bfd == NULL) 2108 /* Hook up this entry into the list of got_entries of H. */ 2109 { 2110 struct elf_m68k_link_hash_entry *h; 2111 2112 h = arg->symndx2h[entry->key_.symndx]; 2113 if (h != NULL) 2114 { 2115 entry->u.s2.next = h->glist; 2116 h->glist = entry; 2117 } 2118 else 2119 /* This should be the entry for TLS_LDM relocation then. */ 2120 { 2121 BFD_ASSERT ((elf_m68k_reloc_got_type (entry->key_.type) 2122 == R_68K_TLS_LDM32) 2123 && entry->key_.symndx == 0); 2124 2125 ++arg->n_ldm_entries; 2126 } 2127 } 2128 else 2129 /* This entry is for local symbol. */ 2130 entry->u.s2.next = NULL; 2131 2132 return 1; 2133 } 2134 2135 /* Assign offsets within GOT. USE_NEG_GOT_OFFSETS_P indicates if we 2136 should use negative offsets. 2137 Build list of GOT entries for global symbols along the way. 2138 SYMNDX2H is mapping from global symbol indices to actual 2139 global symbols. 2140 Return offset at which next GOT should start. */ 2141 2142 static void 2143 elf_m68k_finalize_got_offsets (struct elf_m68k_got *got, 2144 bfd_boolean use_neg_got_offsets_p, 2145 struct elf_m68k_link_hash_entry **symndx2h, 2146 bfd_vma *final_offset, bfd_vma *n_ldm_entries) 2147 { 2148 struct elf_m68k_finalize_got_offsets_arg arg_; 2149 bfd_vma offset1_[2 * R_LAST]; 2150 bfd_vma offset2_[2 * R_LAST]; 2151 int i; 2152 bfd_vma start_offset; 2153 2154 BFD_ASSERT (got->offset != (bfd_vma) -1); 2155 2156 /* We set entry offsets relative to the .got section (and not the 2157 start of a particular GOT), so that we can use them in 2158 finish_dynamic_symbol without needing to know the GOT which they come 2159 from. */ 2160 2161 /* Put offset1 in the middle of offset1_, same for offset2. */ 2162 arg_.offset1 = offset1_ + R_LAST; 2163 arg_.offset2 = offset2_ + R_LAST; 2164 2165 start_offset = got->offset; 2166 2167 if (use_neg_got_offsets_p) 2168 /* Setup both negative and positive ranges for R_8, R_16 and R_32. */ 2169 i = -(int) R_32 - 1; 2170 else 2171 /* Setup positives ranges for R_8, R_16 and R_32. */ 2172 i = (int) R_8; 2173 2174 for (; i <= (int) R_32; ++i) 2175 { 2176 int j; 2177 size_t n; 2178 2179 /* Set beginning of the range of offsets I. */ 2180 arg_.offset1[i] = start_offset; 2181 2182 /* Calculate number of slots that require I offsets. */ 2183 j = (i >= 0) ? i : -i - 1; 2184 n = (j >= 1) ? got->n_slots[j - 1] : 0; 2185 n = got->n_slots[j] - n; 2186 2187 if (use_neg_got_offsets_p && n != 0) 2188 { 2189 if (i < 0) 2190 /* We first fill the positive side of the range, so we might 2191 end up with one empty slot at that side when we can't fit 2192 whole 2-slot entry. Account for that at negative side of 2193 the interval with one additional entry. */ 2194 n = n / 2 + 1; 2195 else 2196 /* When the number of slots is odd, make positive side of the 2197 range one entry bigger. */ 2198 n = (n + 1) / 2; 2199 } 2200 2201 /* N is the number of slots that require I offsets. 2202 Calculate length of the range for I offsets. */ 2203 n = 4 * n; 2204 2205 /* Set end of the range. */ 2206 arg_.offset2[i] = start_offset + n; 2207 2208 start_offset = arg_.offset2[i]; 2209 } 2210 2211 if (!use_neg_got_offsets_p) 2212 /* Make sure that if we try to switch to negative offsets in 2213 elf_m68k_finalize_got_offsets_1, the assert therein will catch 2214 the bug. */ 2215 for (i = R_8; i <= R_32; ++i) 2216 arg_.offset2[-i - 1] = arg_.offset2[i]; 2217 2218 /* Setup got->offset. offset1[R_8] is either in the middle or at the 2219 beginning of GOT depending on use_neg_got_offsets_p. */ 2220 got->offset = arg_.offset1[R_8]; 2221 2222 arg_.symndx2h = symndx2h; 2223 arg_.n_ldm_entries = 0; 2224 2225 /* Assign offsets. */ 2226 htab_traverse (got->entries, elf_m68k_finalize_got_offsets_1, &arg_); 2227 2228 /* Check offset ranges we have actually assigned. */ 2229 for (i = (int) R_8; i <= (int) R_32; ++i) 2230 BFD_ASSERT (arg_.offset2[i] - arg_.offset1[i] <= 4); 2231 2232 *final_offset = start_offset; 2233 *n_ldm_entries = arg_.n_ldm_entries; 2234 } 2235 2236 struct elf_m68k_partition_multi_got_arg 2237 { 2238 /* The GOT we are adding entries to. Aka big got. */ 2239 struct elf_m68k_got *current_got; 2240 2241 /* Offset to assign the next CURRENT_GOT. */ 2242 bfd_vma offset; 2243 2244 /* Context where memory should be allocated. */ 2245 struct bfd_link_info *info; 2246 2247 /* Total number of slots in the .got section. 2248 This is used to calculate size of the .got and .rela.got sections. */ 2249 bfd_vma n_slots; 2250 2251 /* Difference in numbers of allocated slots in the .got section 2252 and necessary relocations in the .rela.got section. 2253 This is used to calculate size of the .rela.got section. */ 2254 bfd_vma slots_relas_diff; 2255 2256 /* Error flag. */ 2257 bfd_boolean error_p; 2258 2259 /* Mapping from global symndx to global symbols. 2260 This is used to build lists of got entries for global symbols. */ 2261 struct elf_m68k_link_hash_entry **symndx2h; 2262 }; 2263 2264 static void 2265 elf_m68k_partition_multi_got_2 (struct elf_m68k_partition_multi_got_arg *arg) 2266 { 2267 bfd_vma n_ldm_entries; 2268 2269 elf_m68k_finalize_got_offsets (arg->current_got, 2270 (elf_m68k_hash_table (arg->info) 2271 ->use_neg_got_offsets_p), 2272 arg->symndx2h, 2273 &arg->offset, &n_ldm_entries); 2274 2275 arg->n_slots += arg->current_got->n_slots[R_32]; 2276 2277 if (!arg->info->shared) 2278 /* If we are generating a shared object, we need to 2279 output a R_68K_RELATIVE reloc so that the dynamic 2280 linker can adjust this GOT entry. Overwise we 2281 don't need space in .rela.got for local symbols. */ 2282 arg->slots_relas_diff += arg->current_got->local_n_slots; 2283 2284 /* @LDM relocations require a 2-slot GOT entry, but only 2285 one relocation. Account for that. */ 2286 arg->slots_relas_diff += n_ldm_entries; 2287 2288 BFD_ASSERT (arg->slots_relas_diff <= arg->n_slots); 2289 } 2290 2291 2292 /* Process a single BFD2GOT entry and either merge GOT to CURRENT_GOT 2293 or start a new CURRENT_GOT. */ 2294 2295 static int 2296 elf_m68k_partition_multi_got_1 (void **_entry, void *_arg) 2297 { 2298 struct elf_m68k_bfd2got_entry *entry; 2299 struct elf_m68k_partition_multi_got_arg *arg; 2300 struct elf_m68k_got *got; 2301 struct elf_m68k_got diff_; 2302 struct elf_m68k_got *diff; 2303 2304 entry = (struct elf_m68k_bfd2got_entry *) *_entry; 2305 arg = (struct elf_m68k_partition_multi_got_arg *) _arg; 2306 2307 got = entry->got; 2308 BFD_ASSERT (got != NULL); 2309 BFD_ASSERT (got->offset == (bfd_vma) -1); 2310 2311 diff = NULL; 2312 2313 if (arg->current_got != NULL) 2314 /* Construct diff. */ 2315 { 2316 diff = &diff_; 2317 elf_m68k_init_got (diff); 2318 2319 if (!elf_m68k_can_merge_gots (arg->current_got, got, arg->info, diff)) 2320 { 2321 if (diff->offset == 0) 2322 /* Offset set to 0 in the diff_ indicates an error. */ 2323 { 2324 arg->error_p = TRUE; 2325 goto final_return; 2326 } 2327 2328 if (elf_m68k_hash_table (arg->info)->allow_multigot_p) 2329 { 2330 elf_m68k_clear_got (diff); 2331 /* Schedule to finish up current_got and start new one. */ 2332 diff = NULL; 2333 } 2334 /* else 2335 Merge GOTs no matter what. If big GOT overflows, 2336 we'll fail in relocate_section due to truncated relocations. 2337 2338 ??? May be fail earlier? E.g., in can_merge_gots. */ 2339 } 2340 } 2341 else 2342 /* Diff of got against empty current_got is got itself. */ 2343 { 2344 /* Create empty current_got to put subsequent GOTs to. */ 2345 arg->current_got = elf_m68k_create_empty_got (arg->info); 2346 if (arg->current_got == NULL) 2347 { 2348 arg->error_p = TRUE; 2349 goto final_return; 2350 } 2351 2352 arg->current_got->offset = arg->offset; 2353 2354 diff = got; 2355 } 2356 2357 if (diff != NULL) 2358 { 2359 if (!elf_m68k_merge_gots (arg->current_got, diff, arg->info)) 2360 { 2361 arg->error_p = TRUE; 2362 goto final_return; 2363 } 2364 2365 /* Now we can free GOT. */ 2366 elf_m68k_clear_got (got); 2367 2368 entry->got = arg->current_got; 2369 } 2370 else 2371 { 2372 /* Finish up current_got. */ 2373 elf_m68k_partition_multi_got_2 (arg); 2374 2375 /* Schedule to start a new current_got. */ 2376 arg->current_got = NULL; 2377 2378 /* Retry. */ 2379 if (!elf_m68k_partition_multi_got_1 (_entry, _arg)) 2380 { 2381 BFD_ASSERT (arg->error_p); 2382 goto final_return; 2383 } 2384 } 2385 2386 final_return: 2387 if (diff != NULL) 2388 elf_m68k_clear_got (diff); 2389 2390 return arg->error_p == FALSE ? 1 : 0; 2391 } 2392 2393 /* Helper function to build symndx2h mapping. */ 2394 2395 static bfd_boolean 2396 elf_m68k_init_symndx2h_1 (struct elf_link_hash_entry *_h, 2397 void *_arg) 2398 { 2399 struct elf_m68k_link_hash_entry *h; 2400 2401 h = elf_m68k_hash_entry (_h); 2402 2403 if (h->got_entry_key != 0) 2404 /* H has at least one entry in the GOT. */ 2405 { 2406 struct elf_m68k_partition_multi_got_arg *arg; 2407 2408 arg = (struct elf_m68k_partition_multi_got_arg *) _arg; 2409 2410 BFD_ASSERT (arg->symndx2h[h->got_entry_key] == NULL); 2411 arg->symndx2h[h->got_entry_key] = h; 2412 } 2413 2414 return TRUE; 2415 } 2416 2417 /* Merge GOTs of some BFDs, assign offsets to GOT entries and build 2418 lists of GOT entries for global symbols. 2419 Calculate sizes of .got and .rela.got sections. */ 2420 2421 static bfd_boolean 2422 elf_m68k_partition_multi_got (struct bfd_link_info *info) 2423 { 2424 struct elf_m68k_multi_got *multi_got; 2425 struct elf_m68k_partition_multi_got_arg arg_; 2426 2427 multi_got = elf_m68k_multi_got (info); 2428 2429 arg_.current_got = NULL; 2430 arg_.offset = 0; 2431 arg_.info = info; 2432 arg_.n_slots = 0; 2433 arg_.slots_relas_diff = 0; 2434 arg_.error_p = FALSE; 2435 2436 if (multi_got->bfd2got != NULL) 2437 { 2438 /* Initialize symndx2h mapping. */ 2439 { 2440 arg_.symndx2h = bfd_zmalloc (multi_got->global_symndx 2441 * sizeof (*arg_.symndx2h)); 2442 if (arg_.symndx2h == NULL) 2443 return FALSE; 2444 2445 elf_link_hash_traverse (elf_hash_table (info), 2446 elf_m68k_init_symndx2h_1, &arg_); 2447 } 2448 2449 /* Partition. */ 2450 htab_traverse (multi_got->bfd2got, elf_m68k_partition_multi_got_1, 2451 &arg_); 2452 if (arg_.error_p) 2453 { 2454 free (arg_.symndx2h); 2455 arg_.symndx2h = NULL; 2456 2457 return FALSE; 2458 } 2459 2460 /* Finish up last current_got. */ 2461 elf_m68k_partition_multi_got_2 (&arg_); 2462 2463 free (arg_.symndx2h); 2464 } 2465 2466 if (elf_hash_table (info)->dynobj != NULL) 2467 /* Set sizes of .got and .rela.got sections. */ 2468 { 2469 asection *s; 2470 2471 s = bfd_get_section_by_name (elf_hash_table (info)->dynobj, ".got"); 2472 if (s != NULL) 2473 s->size = arg_.offset; 2474 else 2475 BFD_ASSERT (arg_.offset == 0); 2476 2477 BFD_ASSERT (arg_.slots_relas_diff <= arg_.n_slots); 2478 arg_.n_slots -= arg_.slots_relas_diff; 2479 2480 s = bfd_get_section_by_name (elf_hash_table (info)->dynobj, ".rela.got"); 2481 if (s != NULL) 2482 s->size = arg_.n_slots * sizeof (Elf32_External_Rela); 2483 else 2484 BFD_ASSERT (arg_.n_slots == 0); 2485 } 2486 else 2487 BFD_ASSERT (multi_got->bfd2got == NULL); 2488 2489 return TRUE; 2490 } 2491 2492 /* Specialized version of elf_m68k_get_got_entry that returns pointer 2493 to hashtable slot, thus allowing removal of entry via 2494 elf_m68k_remove_got_entry. */ 2495 2496 static struct elf_m68k_got_entry ** 2497 elf_m68k_find_got_entry_ptr (struct elf_m68k_got *got, 2498 struct elf_m68k_got_entry_key *key) 2499 { 2500 void **ptr; 2501 struct elf_m68k_got_entry entry_; 2502 struct elf_m68k_got_entry **entry_ptr; 2503 2504 entry_.key_ = *key; 2505 ptr = htab_find_slot (got->entries, &entry_, NO_INSERT); 2506 BFD_ASSERT (ptr != NULL); 2507 2508 entry_ptr = (struct elf_m68k_got_entry **) ptr; 2509 2510 return entry_ptr; 2511 } 2512 2513 /* Remove entry pointed to by ENTRY_PTR from GOT. */ 2514 2515 static void 2516 elf_m68k_remove_got_entry (struct elf_m68k_got *got, 2517 struct elf_m68k_got_entry **entry_ptr) 2518 { 2519 struct elf_m68k_got_entry *entry; 2520 2521 entry = *entry_ptr; 2522 2523 /* Check that offsets have not been finalized yet. */ 2524 BFD_ASSERT (got->offset == (bfd_vma) -1); 2525 /* Check that this entry is indeed unused. */ 2526 BFD_ASSERT (entry->u.s1.refcount == 0); 2527 2528 elf_m68k_remove_got_entry_type (got, entry->key_.type); 2529 2530 if (entry->key_.bfd != NULL) 2531 got->local_n_slots -= elf_m68k_reloc_got_n_slots (entry->key_.type); 2532 2533 BFD_ASSERT (got->n_slots[R_32] >= got->local_n_slots); 2534 2535 htab_clear_slot (got->entries, (void **) entry_ptr); 2536 } 2537 2538 /* Copy any information related to dynamic linking from a pre-existing 2539 symbol to a newly created symbol. Also called to copy flags and 2540 other back-end info to a weakdef, in which case the symbol is not 2541 newly created and plt/got refcounts and dynamic indices should not 2542 be copied. */ 2543 2544 static void 2545 elf_m68k_copy_indirect_symbol (struct bfd_link_info *info, 2546 struct elf_link_hash_entry *_dir, 2547 struct elf_link_hash_entry *_ind) 2548 { 2549 struct elf_m68k_link_hash_entry *dir; 2550 struct elf_m68k_link_hash_entry *ind; 2551 2552 _bfd_elf_link_hash_copy_indirect (info, _dir, _ind); 2553 2554 if (_ind->root.type != bfd_link_hash_indirect) 2555 return; 2556 2557 dir = elf_m68k_hash_entry (_dir); 2558 ind = elf_m68k_hash_entry (_ind); 2559 2560 /* Any absolute non-dynamic relocations against an indirect or weak 2561 definition will be against the target symbol. */ 2562 _dir->non_got_ref |= _ind->non_got_ref; 2563 2564 /* We might have a direct symbol already having entries in the GOTs. 2565 Update its key only in case indirect symbol has GOT entries and 2566 assert that both indirect and direct symbols don't have GOT entries 2567 at the same time. */ 2568 if (ind->got_entry_key != 0) 2569 { 2570 BFD_ASSERT (dir->got_entry_key == 0); 2571 /* Assert that GOTs aren't partioned yet. */ 2572 BFD_ASSERT (ind->glist == NULL); 2573 2574 dir->got_entry_key = ind->got_entry_key; 2575 ind->got_entry_key = 0; 2576 } 2577 } 2578 2579 /* Look through the relocs for a section during the first phase, and 2580 allocate space in the global offset table or procedure linkage 2581 table. */ 2582 2583 static bfd_boolean 2584 elf_m68k_check_relocs (abfd, info, sec, relocs) 2585 bfd *abfd; 2586 struct bfd_link_info *info; 2587 asection *sec; 2588 const Elf_Internal_Rela *relocs; 2589 { 2590 bfd *dynobj; 2591 Elf_Internal_Shdr *symtab_hdr; 2592 struct elf_link_hash_entry **sym_hashes; 2593 const Elf_Internal_Rela *rel; 2594 const Elf_Internal_Rela *rel_end; 2595 asection *sgot; 2596 asection *srelgot; 2597 asection *sreloc; 2598 struct elf_m68k_got *got; 2599 2600 if (info->relocatable) 2601 return TRUE; 2602 2603 dynobj = elf_hash_table (info)->dynobj; 2604 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 2605 sym_hashes = elf_sym_hashes (abfd); 2606 2607 sgot = NULL; 2608 srelgot = NULL; 2609 sreloc = NULL; 2610 2611 got = NULL; 2612 2613 rel_end = relocs + sec->reloc_count; 2614 for (rel = relocs; rel < rel_end; rel++) 2615 { 2616 unsigned long r_symndx; 2617 struct elf_link_hash_entry *h; 2618 2619 r_symndx = ELF32_R_SYM (rel->r_info); 2620 2621 if (r_symndx < symtab_hdr->sh_info) 2622 h = NULL; 2623 else 2624 { 2625 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 2626 while (h->root.type == bfd_link_hash_indirect 2627 || h->root.type == bfd_link_hash_warning) 2628 h = (struct elf_link_hash_entry *) h->root.u.i.link; 2629 } 2630 2631 switch (ELF32_R_TYPE (rel->r_info)) 2632 { 2633 case R_68K_GOT8: 2634 case R_68K_GOT16: 2635 case R_68K_GOT32: 2636 if (h != NULL 2637 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) 2638 break; 2639 /* Fall through. */ 2640 2641 /* Relative GOT relocations. */ 2642 case R_68K_GOT8O: 2643 case R_68K_GOT16O: 2644 case R_68K_GOT32O: 2645 /* Fall through. */ 2646 2647 /* TLS relocations. */ 2648 case R_68K_TLS_GD8: 2649 case R_68K_TLS_GD16: 2650 case R_68K_TLS_GD32: 2651 case R_68K_TLS_LDM8: 2652 case R_68K_TLS_LDM16: 2653 case R_68K_TLS_LDM32: 2654 case R_68K_TLS_IE8: 2655 case R_68K_TLS_IE16: 2656 case R_68K_TLS_IE32: 2657 2658 case R_68K_TLS_TPREL32: 2659 case R_68K_TLS_DTPREL32: 2660 2661 if (ELF32_R_TYPE (rel->r_info) == R_68K_TLS_TPREL32 2662 && info->shared) 2663 /* Do the special chorus for libraries with static TLS. */ 2664 info->flags |= DF_STATIC_TLS; 2665 2666 /* This symbol requires a global offset table entry. */ 2667 2668 if (dynobj == NULL) 2669 { 2670 /* Create the .got section. */ 2671 elf_hash_table (info)->dynobj = dynobj = abfd; 2672 if (!_bfd_elf_create_got_section (dynobj, info)) 2673 return FALSE; 2674 } 2675 2676 if (sgot == NULL) 2677 { 2678 sgot = bfd_get_section_by_name (dynobj, ".got"); 2679 BFD_ASSERT (sgot != NULL); 2680 } 2681 2682 if (srelgot == NULL 2683 && (h != NULL || info->shared)) 2684 { 2685 srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); 2686 if (srelgot == NULL) 2687 { 2688 srelgot = bfd_make_section_with_flags (dynobj, 2689 ".rela.got", 2690 (SEC_ALLOC 2691 | SEC_LOAD 2692 | SEC_HAS_CONTENTS 2693 | SEC_IN_MEMORY 2694 | SEC_LINKER_CREATED 2695 | SEC_READONLY)); 2696 if (srelgot == NULL 2697 || !bfd_set_section_alignment (dynobj, srelgot, 2)) 2698 return FALSE; 2699 } 2700 } 2701 2702 if (got == NULL) 2703 { 2704 struct elf_m68k_bfd2got_entry *bfd2got_entry; 2705 2706 bfd2got_entry 2707 = elf_m68k_get_bfd2got_entry (elf_m68k_multi_got (info), 2708 abfd, FIND_OR_CREATE, info); 2709 if (bfd2got_entry == NULL) 2710 return FALSE; 2711 2712 got = bfd2got_entry->got; 2713 BFD_ASSERT (got != NULL); 2714 } 2715 2716 { 2717 struct elf_m68k_got_entry *got_entry; 2718 2719 /* Add entry to got. */ 2720 got_entry = elf_m68k_add_entry_to_got (got, h, abfd, 2721 ELF32_R_TYPE (rel->r_info), 2722 r_symndx, info); 2723 if (got_entry == NULL) 2724 return FALSE; 2725 2726 if (got_entry->u.s1.refcount == 1) 2727 { 2728 /* Make sure this symbol is output as a dynamic symbol. */ 2729 if (h != NULL 2730 && h->dynindx == -1 2731 && !h->forced_local) 2732 { 2733 if (!bfd_elf_link_record_dynamic_symbol (info, h)) 2734 return FALSE; 2735 } 2736 } 2737 } 2738 2739 break; 2740 2741 case R_68K_PLT8: 2742 case R_68K_PLT16: 2743 case R_68K_PLT32: 2744 /* This symbol requires a procedure linkage table entry. We 2745 actually build the entry in adjust_dynamic_symbol, 2746 because this might be a case of linking PIC code which is 2747 never referenced by a dynamic object, in which case we 2748 don't need to generate a procedure linkage table entry 2749 after all. */ 2750 2751 /* If this is a local symbol, we resolve it directly without 2752 creating a procedure linkage table entry. */ 2753 if (h == NULL) 2754 continue; 2755 2756 h->needs_plt = 1; 2757 h->plt.refcount++; 2758 break; 2759 2760 case R_68K_PLT8O: 2761 case R_68K_PLT16O: 2762 case R_68K_PLT32O: 2763 /* This symbol requires a procedure linkage table entry. */ 2764 2765 if (h == NULL) 2766 { 2767 /* It does not make sense to have this relocation for a 2768 local symbol. FIXME: does it? How to handle it if 2769 it does make sense? */ 2770 bfd_set_error (bfd_error_bad_value); 2771 return FALSE; 2772 } 2773 2774 /* Make sure this symbol is output as a dynamic symbol. */ 2775 if (h->dynindx == -1 2776 && !h->forced_local) 2777 { 2778 if (!bfd_elf_link_record_dynamic_symbol (info, h)) 2779 return FALSE; 2780 } 2781 2782 h->needs_plt = 1; 2783 h->plt.refcount++; 2784 break; 2785 2786 case R_68K_PC8: 2787 case R_68K_PC16: 2788 case R_68K_PC32: 2789 /* If we are creating a shared library and this is not a local 2790 symbol, we need to copy the reloc into the shared library. 2791 However when linking with -Bsymbolic and this is a global 2792 symbol which is defined in an object we are including in the 2793 link (i.e., DEF_REGULAR is set), then we can resolve the 2794 reloc directly. At this point we have not seen all the input 2795 files, so it is possible that DEF_REGULAR is not set now but 2796 will be set later (it is never cleared). We account for that 2797 possibility below by storing information in the 2798 pcrel_relocs_copied field of the hash table entry. */ 2799 if (!(info->shared 2800 && (sec->flags & SEC_ALLOC) != 0 2801 && h != NULL 2802 && (!info->symbolic 2803 || h->root.type == bfd_link_hash_defweak 2804 || !h->def_regular))) 2805 { 2806 if (h != NULL) 2807 { 2808 /* Make sure a plt entry is created for this symbol if 2809 it turns out to be a function defined by a dynamic 2810 object. */ 2811 h->plt.refcount++; 2812 } 2813 break; 2814 } 2815 /* Fall through. */ 2816 case R_68K_8: 2817 case R_68K_16: 2818 case R_68K_32: 2819 if (h != NULL) 2820 { 2821 /* Make sure a plt entry is created for this symbol if it 2822 turns out to be a function defined by a dynamic object. */ 2823 h->plt.refcount++; 2824 2825 if (!info->shared) 2826 /* This symbol needs a non-GOT reference. */ 2827 h->non_got_ref = 1; 2828 } 2829 2830 /* If we are creating a shared library, we need to copy the 2831 reloc into the shared library. */ 2832 if (info->shared 2833 && (sec->flags & SEC_ALLOC) != 0) 2834 { 2835 /* When creating a shared object, we must copy these 2836 reloc types into the output file. We create a reloc 2837 section in dynobj and make room for this reloc. */ 2838 if (sreloc == NULL) 2839 { 2840 sreloc = _bfd_elf_make_dynamic_reloc_section 2841 (sec, dynobj, 2, abfd, /*rela?*/ TRUE); 2842 2843 if (sreloc == NULL) 2844 return FALSE; 2845 } 2846 2847 if (sec->flags & SEC_READONLY 2848 /* Don't set DF_TEXTREL yet for PC relative 2849 relocations, they might be discarded later. */ 2850 && !(ELF32_R_TYPE (rel->r_info) == R_68K_PC8 2851 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16 2852 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32)) 2853 info->flags |= DF_TEXTREL; 2854 2855 sreloc->size += sizeof (Elf32_External_Rela); 2856 2857 /* We count the number of PC relative relocations we have 2858 entered for this symbol, so that we can discard them 2859 again if, in the -Bsymbolic case, the symbol is later 2860 defined by a regular object, or, in the normal shared 2861 case, the symbol is forced to be local. Note that this 2862 function is only called if we are using an m68kelf linker 2863 hash table, which means that h is really a pointer to an 2864 elf_m68k_link_hash_entry. */ 2865 if (ELF32_R_TYPE (rel->r_info) == R_68K_PC8 2866 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16 2867 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32) 2868 { 2869 struct elf_m68k_pcrel_relocs_copied *p; 2870 struct elf_m68k_pcrel_relocs_copied **head; 2871 2872 if (h != NULL) 2873 { 2874 struct elf_m68k_link_hash_entry *eh 2875 = elf_m68k_hash_entry (h); 2876 head = &eh->pcrel_relocs_copied; 2877 } 2878 else 2879 { 2880 asection *s; 2881 void *vpp; 2882 Elf_Internal_Sym *isym; 2883 2884 isym = bfd_sym_from_r_symndx (&elf_m68k_hash_table (info)->sym_cache, 2885 abfd, r_symndx); 2886 if (isym == NULL) 2887 return FALSE; 2888 2889 s = bfd_section_from_elf_index (abfd, isym->st_shndx); 2890 if (s == NULL) 2891 s = sec; 2892 2893 vpp = &elf_section_data (s)->local_dynrel; 2894 head = (struct elf_m68k_pcrel_relocs_copied **) vpp; 2895 } 2896 2897 for (p = *head; p != NULL; p = p->next) 2898 if (p->section == sreloc) 2899 break; 2900 2901 if (p == NULL) 2902 { 2903 p = ((struct elf_m68k_pcrel_relocs_copied *) 2904 bfd_alloc (dynobj, (bfd_size_type) sizeof *p)); 2905 if (p == NULL) 2906 return FALSE; 2907 p->next = *head; 2908 *head = p; 2909 p->section = sreloc; 2910 p->count = 0; 2911 } 2912 2913 ++p->count; 2914 } 2915 } 2916 2917 break; 2918 2919 /* This relocation describes the C++ object vtable hierarchy. 2920 Reconstruct it for later use during GC. */ 2921 case R_68K_GNU_VTINHERIT: 2922 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 2923 return FALSE; 2924 break; 2925 2926 /* This relocation describes which C++ vtable entries are actually 2927 used. Record for later use during GC. */ 2928 case R_68K_GNU_VTENTRY: 2929 BFD_ASSERT (h != NULL); 2930 if (h != NULL 2931 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 2932 return FALSE; 2933 break; 2934 2935 default: 2936 break; 2937 } 2938 } 2939 2940 return TRUE; 2941 } 2942 2943 /* Return the section that should be marked against GC for a given 2944 relocation. */ 2945 2946 static asection * 2947 elf_m68k_gc_mark_hook (asection *sec, 2948 struct bfd_link_info *info, 2949 Elf_Internal_Rela *rel, 2950 struct elf_link_hash_entry *h, 2951 Elf_Internal_Sym *sym) 2952 { 2953 if (h != NULL) 2954 switch (ELF32_R_TYPE (rel->r_info)) 2955 { 2956 case R_68K_GNU_VTINHERIT: 2957 case R_68K_GNU_VTENTRY: 2958 return NULL; 2959 } 2960 2961 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 2962 } 2963 2964 /* Update the got entry reference counts for the section being removed. */ 2965 2966 static bfd_boolean 2967 elf_m68k_gc_sweep_hook (bfd *abfd, 2968 struct bfd_link_info *info, 2969 asection *sec, 2970 const Elf_Internal_Rela *relocs) 2971 { 2972 Elf_Internal_Shdr *symtab_hdr; 2973 struct elf_link_hash_entry **sym_hashes; 2974 const Elf_Internal_Rela *rel, *relend; 2975 bfd *dynobj; 2976 struct elf_m68k_got *got; 2977 2978 if (info->relocatable) 2979 return TRUE; 2980 2981 dynobj = elf_hash_table (info)->dynobj; 2982 if (dynobj == NULL) 2983 return TRUE; 2984 2985 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 2986 sym_hashes = elf_sym_hashes (abfd); 2987 got = NULL; 2988 2989 relend = relocs + sec->reloc_count; 2990 for (rel = relocs; rel < relend; rel++) 2991 { 2992 unsigned long r_symndx; 2993 struct elf_link_hash_entry *h = NULL; 2994 2995 r_symndx = ELF32_R_SYM (rel->r_info); 2996 if (r_symndx >= symtab_hdr->sh_info) 2997 { 2998 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 2999 while (h->root.type == bfd_link_hash_indirect 3000 || h->root.type == bfd_link_hash_warning) 3001 h = (struct elf_link_hash_entry *) h->root.u.i.link; 3002 } 3003 3004 switch (ELF32_R_TYPE (rel->r_info)) 3005 { 3006 case R_68K_GOT8: 3007 case R_68K_GOT16: 3008 case R_68K_GOT32: 3009 if (h != NULL 3010 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) 3011 break; 3012 3013 /* FALLTHRU */ 3014 case R_68K_GOT8O: 3015 case R_68K_GOT16O: 3016 case R_68K_GOT32O: 3017 /* Fall through. */ 3018 3019 /* TLS relocations. */ 3020 case R_68K_TLS_GD8: 3021 case R_68K_TLS_GD16: 3022 case R_68K_TLS_GD32: 3023 case R_68K_TLS_LDM8: 3024 case R_68K_TLS_LDM16: 3025 case R_68K_TLS_LDM32: 3026 case R_68K_TLS_IE8: 3027 case R_68K_TLS_IE16: 3028 case R_68K_TLS_IE32: 3029 3030 case R_68K_TLS_TPREL32: 3031 case R_68K_TLS_DTPREL32: 3032 3033 if (got == NULL) 3034 { 3035 got = elf_m68k_get_bfd2got_entry (elf_m68k_multi_got (info), 3036 abfd, MUST_FIND, NULL)->got; 3037 BFD_ASSERT (got != NULL); 3038 } 3039 3040 { 3041 struct elf_m68k_got_entry_key key_; 3042 struct elf_m68k_got_entry **got_entry_ptr; 3043 struct elf_m68k_got_entry *got_entry; 3044 3045 elf_m68k_init_got_entry_key (&key_, h, abfd, r_symndx, 3046 ELF32_R_TYPE (rel->r_info)); 3047 got_entry_ptr = elf_m68k_find_got_entry_ptr (got, &key_); 3048 3049 got_entry = *got_entry_ptr; 3050 3051 if (got_entry->u.s1.refcount > 0) 3052 { 3053 --got_entry->u.s1.refcount; 3054 3055 if (got_entry->u.s1.refcount == 0) 3056 /* We don't need the .got entry any more. */ 3057 elf_m68k_remove_got_entry (got, got_entry_ptr); 3058 } 3059 } 3060 break; 3061 3062 case R_68K_PLT8: 3063 case R_68K_PLT16: 3064 case R_68K_PLT32: 3065 case R_68K_PLT8O: 3066 case R_68K_PLT16O: 3067 case R_68K_PLT32O: 3068 case R_68K_PC8: 3069 case R_68K_PC16: 3070 case R_68K_PC32: 3071 case R_68K_8: 3072 case R_68K_16: 3073 case R_68K_32: 3074 if (h != NULL) 3075 { 3076 if (h->plt.refcount > 0) 3077 --h->plt.refcount; 3078 } 3079 break; 3080 3081 default: 3082 break; 3083 } 3084 } 3085 3086 return TRUE; 3087 } 3088 3089 /* Return the type of PLT associated with OUTPUT_BFD. */ 3091 3092 static const struct elf_m68k_plt_info * 3093 elf_m68k_get_plt_info (bfd *output_bfd) 3094 { 3095 unsigned int features; 3096 3097 features = bfd_m68k_mach_to_features (bfd_get_mach (output_bfd)); 3098 if (features & cpu32) 3099 return &elf_cpu32_plt_info; 3100 if (features & mcfisa_b) 3101 return &elf_isab_plt_info; 3102 if (features & mcfisa_c) 3103 return &elf_isac_plt_info; 3104 return &elf_m68k_plt_info; 3105 } 3106 3107 /* This function is called after all the input files have been read, 3108 and the input sections have been assigned to output sections. 3109 It's a convenient place to determine the PLT style. */ 3110 3111 static bfd_boolean 3112 elf_m68k_always_size_sections (bfd *output_bfd, struct bfd_link_info *info) 3113 { 3114 /* Bind input BFDs to GOTs and calculate sizes of .got and .rela.got 3115 sections. */ 3116 if (!elf_m68k_partition_multi_got (info)) 3117 return FALSE; 3118 3119 elf_m68k_hash_table (info)->plt_info = elf_m68k_get_plt_info (output_bfd); 3120 return TRUE; 3121 } 3122 3123 /* Adjust a symbol defined by a dynamic object and referenced by a 3124 regular object. The current definition is in some section of the 3125 dynamic object, but we're not including those sections. We have to 3126 change the definition to something the rest of the link can 3127 understand. */ 3128 3129 static bfd_boolean 3130 elf_m68k_adjust_dynamic_symbol (info, h) 3131 struct bfd_link_info *info; 3132 struct elf_link_hash_entry *h; 3133 { 3134 struct elf_m68k_link_hash_table *htab; 3135 bfd *dynobj; 3136 asection *s; 3137 3138 htab = elf_m68k_hash_table (info); 3139 dynobj = elf_hash_table (info)->dynobj; 3140 3141 /* Make sure we know what is going on here. */ 3142 BFD_ASSERT (dynobj != NULL 3143 && (h->needs_plt 3144 || h->u.weakdef != NULL 3145 || (h->def_dynamic 3146 && h->ref_regular 3147 && !h->def_regular))); 3148 3149 /* If this is a function, put it in the procedure linkage table. We 3150 will fill in the contents of the procedure linkage table later, 3151 when we know the address of the .got section. */ 3152 if (h->type == STT_FUNC 3153 || h->needs_plt) 3154 { 3155 if ((h->plt.refcount <= 0 3156 || SYMBOL_CALLS_LOCAL (info, h) 3157 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 3158 && h->root.type == bfd_link_hash_undefweak)) 3159 /* We must always create the plt entry if it was referenced 3160 by a PLTxxO relocation. In this case we already recorded 3161 it as a dynamic symbol. */ 3162 && h->dynindx == -1) 3163 { 3164 /* This case can occur if we saw a PLTxx reloc in an input 3165 file, but the symbol was never referred to by a dynamic 3166 object, or if all references were garbage collected. In 3167 such a case, we don't actually need to build a procedure 3168 linkage table, and we can just do a PCxx reloc instead. */ 3169 h->plt.offset = (bfd_vma) -1; 3170 h->needs_plt = 0; 3171 return TRUE; 3172 } 3173 3174 /* Make sure this symbol is output as a dynamic symbol. */ 3175 if (h->dynindx == -1 3176 && !h->forced_local) 3177 { 3178 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 3179 return FALSE; 3180 } 3181 3182 s = bfd_get_section_by_name (dynobj, ".plt"); 3183 BFD_ASSERT (s != NULL); 3184 3185 /* If this is the first .plt entry, make room for the special 3186 first entry. */ 3187 if (s->size == 0) 3188 s->size = htab->plt_info->size; 3189 3190 /* If this symbol is not defined in a regular file, and we are 3191 not generating a shared library, then set the symbol to this 3192 location in the .plt. This is required to make function 3193 pointers compare as equal between the normal executable and 3194 the shared library. */ 3195 if (!info->shared 3196 && !h->def_regular) 3197 { 3198 h->root.u.def.section = s; 3199 h->root.u.def.value = s->size; 3200 } 3201 3202 h->plt.offset = s->size; 3203 3204 /* Make room for this entry. */ 3205 s->size += htab->plt_info->size; 3206 3207 /* We also need to make an entry in the .got.plt section, which 3208 will be placed in the .got section by the linker script. */ 3209 s = bfd_get_section_by_name (dynobj, ".got.plt"); 3210 BFD_ASSERT (s != NULL); 3211 s->size += 4; 3212 3213 /* We also need to make an entry in the .rela.plt section. */ 3214 s = bfd_get_section_by_name (dynobj, ".rela.plt"); 3215 BFD_ASSERT (s != NULL); 3216 s->size += sizeof (Elf32_External_Rela); 3217 3218 return TRUE; 3219 } 3220 3221 /* Reinitialize the plt offset now that it is not used as a reference 3222 count any more. */ 3223 h->plt.offset = (bfd_vma) -1; 3224 3225 /* If this is a weak symbol, and there is a real definition, the 3226 processor independent code will have arranged for us to see the 3227 real definition first, and we can just use the same value. */ 3228 if (h->u.weakdef != NULL) 3229 { 3230 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 3231 || h->u.weakdef->root.type == bfd_link_hash_defweak); 3232 h->root.u.def.section = h->u.weakdef->root.u.def.section; 3233 h->root.u.def.value = h->u.weakdef->root.u.def.value; 3234 return TRUE; 3235 } 3236 3237 /* This is a reference to a symbol defined by a dynamic object which 3238 is not a function. */ 3239 3240 /* If we are creating a shared library, we must presume that the 3241 only references to the symbol are via the global offset table. 3242 For such cases we need not do anything here; the relocations will 3243 be handled correctly by relocate_section. */ 3244 if (info->shared) 3245 return TRUE; 3246 3247 /* If there are no references to this symbol that do not use the 3248 GOT, we don't need to generate a copy reloc. */ 3249 if (!h->non_got_ref) 3250 return TRUE; 3251 3252 if (h->size == 0) 3253 { 3254 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"), 3255 h->root.root.string); 3256 return TRUE; 3257 } 3258 3259 /* We must allocate the symbol in our .dynbss section, which will 3260 become part of the .bss section of the executable. There will be 3261 an entry for this symbol in the .dynsym section. The dynamic 3262 object will contain position independent code, so all references 3263 from the dynamic object to this symbol will go through the global 3264 offset table. The dynamic linker will use the .dynsym entry to 3265 determine the address it must put in the global offset table, so 3266 both the dynamic object and the regular object will refer to the 3267 same memory location for the variable. */ 3268 3269 s = bfd_get_section_by_name (dynobj, ".dynbss"); 3270 BFD_ASSERT (s != NULL); 3271 3272 /* We must generate a R_68K_COPY reloc to tell the dynamic linker to 3273 copy the initial value out of the dynamic object and into the 3274 runtime process image. We need to remember the offset into the 3275 .rela.bss section we are going to use. */ 3276 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) 3277 { 3278 asection *srel; 3279 3280 srel = bfd_get_section_by_name (dynobj, ".rela.bss"); 3281 BFD_ASSERT (srel != NULL); 3282 srel->size += sizeof (Elf32_External_Rela); 3283 h->needs_copy = 1; 3284 } 3285 3286 return _bfd_elf_adjust_dynamic_copy (h, s); 3287 } 3288 3289 /* Set the sizes of the dynamic sections. */ 3290 3291 static bfd_boolean 3292 elf_m68k_size_dynamic_sections (output_bfd, info) 3293 bfd *output_bfd ATTRIBUTE_UNUSED; 3294 struct bfd_link_info *info; 3295 { 3296 bfd *dynobj; 3297 asection *s; 3298 bfd_boolean plt; 3299 bfd_boolean relocs; 3300 3301 dynobj = elf_hash_table (info)->dynobj; 3302 BFD_ASSERT (dynobj != NULL); 3303 3304 if (elf_hash_table (info)->dynamic_sections_created) 3305 { 3306 /* Set the contents of the .interp section to the interpreter. */ 3307 if (info->executable) 3308 { 3309 s = bfd_get_section_by_name (dynobj, ".interp"); 3310 BFD_ASSERT (s != NULL); 3311 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 3312 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 3313 } 3314 } 3315 else 3316 { 3317 /* We may have created entries in the .rela.got section. 3318 However, if we are not creating the dynamic sections, we will 3319 not actually use these entries. Reset the size of .rela.got, 3320 which will cause it to get stripped from the output file 3321 below. */ 3322 s = bfd_get_section_by_name (dynobj, ".rela.got"); 3323 if (s != NULL) 3324 s->size = 0; 3325 } 3326 3327 /* If this is a -Bsymbolic shared link, then we need to discard all 3328 PC relative relocs against symbols defined in a regular object. 3329 For the normal shared case we discard the PC relative relocs 3330 against symbols that have become local due to visibility changes. 3331 We allocated space for them in the check_relocs routine, but we 3332 will not fill them in in the relocate_section routine. */ 3333 if (info->shared) 3334 elf_link_hash_traverse (elf_hash_table (info), 3335 elf_m68k_discard_copies, 3336 (PTR) info); 3337 3338 /* The check_relocs and adjust_dynamic_symbol entry points have 3339 determined the sizes of the various dynamic sections. Allocate 3340 memory for them. */ 3341 plt = FALSE; 3342 relocs = FALSE; 3343 for (s = dynobj->sections; s != NULL; s = s->next) 3344 { 3345 const char *name; 3346 3347 if ((s->flags & SEC_LINKER_CREATED) == 0) 3348 continue; 3349 3350 /* It's OK to base decisions on the section name, because none 3351 of the dynobj section names depend upon the input files. */ 3352 name = bfd_get_section_name (dynobj, s); 3353 3354 if (strcmp (name, ".plt") == 0) 3355 { 3356 /* Remember whether there is a PLT. */ 3357 plt = s->size != 0; 3358 } 3359 else if (CONST_STRNEQ (name, ".rela")) 3360 { 3361 if (s->size != 0) 3362 { 3363 relocs = TRUE; 3364 3365 /* We use the reloc_count field as a counter if we need 3366 to copy relocs into the output file. */ 3367 s->reloc_count = 0; 3368 } 3369 } 3370 else if (! CONST_STRNEQ (name, ".got") 3371 && strcmp (name, ".dynbss") != 0) 3372 { 3373 /* It's not one of our sections, so don't allocate space. */ 3374 continue; 3375 } 3376 3377 if (s->size == 0) 3378 { 3379 /* If we don't need this section, strip it from the 3380 output file. This is mostly to handle .rela.bss and 3381 .rela.plt. We must create both sections in 3382 create_dynamic_sections, because they must be created 3383 before the linker maps input sections to output 3384 sections. The linker does that before 3385 adjust_dynamic_symbol is called, and it is that 3386 function which decides whether anything needs to go 3387 into these sections. */ 3388 s->flags |= SEC_EXCLUDE; 3389 continue; 3390 } 3391 3392 if ((s->flags & SEC_HAS_CONTENTS) == 0) 3393 continue; 3394 3395 /* Allocate memory for the section contents. */ 3396 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc. 3397 Unused entries should be reclaimed before the section's contents 3398 are written out, but at the moment this does not happen. Thus in 3399 order to prevent writing out garbage, we initialise the section's 3400 contents to zero. */ 3401 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); 3402 if (s->contents == NULL) 3403 return FALSE; 3404 } 3405 3406 if (elf_hash_table (info)->dynamic_sections_created) 3407 { 3408 /* Add some entries to the .dynamic section. We fill in the 3409 values later, in elf_m68k_finish_dynamic_sections, but we 3410 must add the entries now so that we get the correct size for 3411 the .dynamic section. The DT_DEBUG entry is filled in by the 3412 dynamic linker and used by the debugger. */ 3413 #define add_dynamic_entry(TAG, VAL) \ 3414 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 3415 3416 if (!info->shared) 3417 { 3418 if (!add_dynamic_entry (DT_DEBUG, 0)) 3419 return FALSE; 3420 } 3421 3422 if (plt) 3423 { 3424 if (!add_dynamic_entry (DT_PLTGOT, 0) 3425 || !add_dynamic_entry (DT_PLTRELSZ, 0) 3426 || !add_dynamic_entry (DT_PLTREL, DT_RELA) 3427 || !add_dynamic_entry (DT_JMPREL, 0)) 3428 return FALSE; 3429 } 3430 3431 if (relocs) 3432 { 3433 if (!add_dynamic_entry (DT_RELA, 0) 3434 || !add_dynamic_entry (DT_RELASZ, 0) 3435 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela))) 3436 return FALSE; 3437 } 3438 3439 if ((info->flags & DF_TEXTREL) != 0) 3440 { 3441 if (!add_dynamic_entry (DT_TEXTREL, 0)) 3442 return FALSE; 3443 } 3444 } 3445 #undef add_dynamic_entry 3446 3447 return TRUE; 3448 } 3449 3450 /* This function is called via elf_link_hash_traverse if we are 3451 creating a shared object. In the -Bsymbolic case it discards the 3452 space allocated to copy PC relative relocs against symbols which 3453 are defined in regular objects. For the normal shared case, it 3454 discards space for pc-relative relocs that have become local due to 3455 symbol visibility changes. We allocated space for them in the 3456 check_relocs routine, but we won't fill them in in the 3457 relocate_section routine. 3458 3459 We also check whether any of the remaining relocations apply 3460 against a readonly section, and set the DF_TEXTREL flag in this 3461 case. */ 3462 3463 static bfd_boolean 3464 elf_m68k_discard_copies (h, inf) 3465 struct elf_link_hash_entry *h; 3466 PTR inf; 3467 { 3468 struct bfd_link_info *info = (struct bfd_link_info *) inf; 3469 struct elf_m68k_pcrel_relocs_copied *s; 3470 3471 if (h->root.type == bfd_link_hash_warning) 3472 h = (struct elf_link_hash_entry *) h->root.u.i.link; 3473 3474 if (!SYMBOL_CALLS_LOCAL (info, h)) 3475 { 3476 if ((info->flags & DF_TEXTREL) == 0) 3477 { 3478 /* Look for relocations against read-only sections. */ 3479 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied; 3480 s != NULL; 3481 s = s->next) 3482 if ((s->section->flags & SEC_READONLY) != 0) 3483 { 3484 info->flags |= DF_TEXTREL; 3485 break; 3486 } 3487 } 3488 3489 return TRUE; 3490 } 3491 3492 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied; 3493 s != NULL; 3494 s = s->next) 3495 s->section->size -= s->count * sizeof (Elf32_External_Rela); 3496 3497 return TRUE; 3498 } 3499 3500 3501 /* Install relocation RELA. */ 3502 3503 static void 3504 elf_m68k_install_rela (bfd *output_bfd, 3505 asection *srela, 3506 Elf_Internal_Rela *rela) 3507 { 3508 bfd_byte *loc; 3509 3510 loc = srela->contents; 3511 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela); 3512 bfd_elf32_swap_reloca_out (output_bfd, rela, loc); 3513 } 3514 3515 /* Find the base offsets for thread-local storage in this object, 3516 for GD/LD and IE/LE respectively. */ 3517 3518 #define DTP_OFFSET 0x8000 3519 #define TP_OFFSET 0x7000 3520 3521 static bfd_vma 3522 dtpoff_base (struct bfd_link_info *info) 3523 { 3524 /* If tls_sec is NULL, we should have signalled an error already. */ 3525 if (elf_hash_table (info)->tls_sec == NULL) 3526 return 0; 3527 return elf_hash_table (info)->tls_sec->vma + DTP_OFFSET; 3528 } 3529 3530 static bfd_vma 3531 tpoff_base (struct bfd_link_info *info) 3532 { 3533 /* If tls_sec is NULL, we should have signalled an error already. */ 3534 if (elf_hash_table (info)->tls_sec == NULL) 3535 return 0; 3536 return elf_hash_table (info)->tls_sec->vma + TP_OFFSET; 3537 } 3538 3539 /* Output necessary relocation to handle a symbol during static link. 3540 This function is called from elf_m68k_relocate_section. */ 3541 3542 static void 3543 elf_m68k_init_got_entry_static (struct bfd_link_info *info, 3544 bfd *output_bfd, 3545 enum elf_m68k_reloc_type r_type, 3546 asection *sgot, 3547 bfd_vma got_entry_offset, 3548 bfd_vma relocation) 3549 { 3550 switch (elf_m68k_reloc_got_type (r_type)) 3551 { 3552 case R_68K_GOT32O: 3553 bfd_put_32 (output_bfd, relocation, sgot->contents + got_entry_offset); 3554 break; 3555 3556 case R_68K_TLS_GD32: 3557 /* We know the offset within the module, 3558 put it into the second GOT slot. */ 3559 bfd_put_32 (output_bfd, relocation - dtpoff_base (info), 3560 sgot->contents + got_entry_offset + 4); 3561 /* FALLTHRU */ 3562 3563 case R_68K_TLS_LDM32: 3564 /* Mark it as belonging to module 1, the executable. */ 3565 bfd_put_32 (output_bfd, 1, sgot->contents + got_entry_offset); 3566 break; 3567 3568 case R_68K_TLS_IE32: 3569 bfd_put_32 (output_bfd, relocation - tpoff_base (info), 3570 sgot->contents + got_entry_offset); 3571 break; 3572 3573 default: 3574 BFD_ASSERT (FALSE); 3575 } 3576 } 3577 3578 /* Output necessary relocation to handle a local symbol 3579 during dynamic link. 3580 This function is called either from elf_m68k_relocate_section 3581 or from elf_m68k_finish_dynamic_symbol. */ 3582 3583 static void 3584 elf_m68k_init_got_entry_local_shared (struct bfd_link_info *info, 3585 bfd *output_bfd, 3586 enum elf_m68k_reloc_type r_type, 3587 asection *sgot, 3588 bfd_vma got_entry_offset, 3589 bfd_vma relocation, 3590 asection *srela) 3591 { 3592 Elf_Internal_Rela outrel; 3593 3594 switch (elf_m68k_reloc_got_type (r_type)) 3595 { 3596 case R_68K_GOT32O: 3597 /* Emit RELATIVE relocation to initialize GOT slot 3598 at run-time. */ 3599 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE); 3600 outrel.r_addend = relocation; 3601 break; 3602 3603 case R_68K_TLS_GD32: 3604 /* We know the offset within the module, 3605 put it into the second GOT slot. */ 3606 bfd_put_32 (output_bfd, relocation - dtpoff_base (info), 3607 sgot->contents + got_entry_offset + 4); 3608 /* FALLTHRU */ 3609 3610 case R_68K_TLS_LDM32: 3611 /* We don't know the module number, 3612 create a relocation for it. */ 3613 outrel.r_info = ELF32_R_INFO (0, R_68K_TLS_DTPMOD32); 3614 outrel.r_addend = 0; 3615 break; 3616 3617 case R_68K_TLS_IE32: 3618 /* Emit TPREL relocation to initialize GOT slot 3619 at run-time. */ 3620 outrel.r_info = ELF32_R_INFO (0, R_68K_TLS_TPREL32); 3621 outrel.r_addend = relocation - elf_hash_table (info)->tls_sec->vma; 3622 break; 3623 3624 default: 3625 BFD_ASSERT (FALSE); 3626 } 3627 3628 /* Offset of the GOT entry. */ 3629 outrel.r_offset = (sgot->output_section->vma 3630 + sgot->output_offset 3631 + got_entry_offset); 3632 3633 /* Install one of the above relocations. */ 3634 elf_m68k_install_rela (output_bfd, srela, &outrel); 3635 3636 bfd_put_32 (output_bfd, outrel.r_addend, sgot->contents + got_entry_offset); 3637 } 3638 3639 /* Relocate an M68K ELF section. */ 3640 3641 static bfd_boolean 3642 elf_m68k_relocate_section (output_bfd, info, input_bfd, input_section, 3643 contents, relocs, local_syms, local_sections) 3644 bfd *output_bfd; 3645 struct bfd_link_info *info; 3646 bfd *input_bfd; 3647 asection *input_section; 3648 bfd_byte *contents; 3649 Elf_Internal_Rela *relocs; 3650 Elf_Internal_Sym *local_syms; 3651 asection **local_sections; 3652 { 3653 bfd *dynobj; 3654 Elf_Internal_Shdr *symtab_hdr; 3655 struct elf_link_hash_entry **sym_hashes; 3656 asection *sgot; 3657 asection *splt; 3658 asection *sreloc; 3659 asection *srela; 3660 struct elf_m68k_got *got; 3661 Elf_Internal_Rela *rel; 3662 Elf_Internal_Rela *relend; 3663 3664 dynobj = elf_hash_table (info)->dynobj; 3665 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 3666 sym_hashes = elf_sym_hashes (input_bfd); 3667 3668 sgot = NULL; 3669 splt = NULL; 3670 sreloc = NULL; 3671 srela = NULL; 3672 3673 got = NULL; 3674 3675 rel = relocs; 3676 relend = relocs + input_section->reloc_count; 3677 for (; rel < relend; rel++) 3678 { 3679 int r_type; 3680 reloc_howto_type *howto; 3681 unsigned long r_symndx; 3682 struct elf_link_hash_entry *h; 3683 Elf_Internal_Sym *sym; 3684 asection *sec; 3685 bfd_vma relocation; 3686 bfd_boolean unresolved_reloc; 3687 bfd_reloc_status_type r; 3688 3689 r_type = ELF32_R_TYPE (rel->r_info); 3690 if (r_type < 0 || r_type >= (int) R_68K_max) 3691 { 3692 bfd_set_error (bfd_error_bad_value); 3693 return FALSE; 3694 } 3695 howto = howto_table + r_type; 3696 3697 r_symndx = ELF32_R_SYM (rel->r_info); 3698 3699 h = NULL; 3700 sym = NULL; 3701 sec = NULL; 3702 unresolved_reloc = FALSE; 3703 3704 if (r_symndx < symtab_hdr->sh_info) 3705 { 3706 sym = local_syms + r_symndx; 3707 sec = local_sections[r_symndx]; 3708 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 3709 } 3710 else 3711 { 3712 bfd_boolean warned; 3713 3714 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 3715 r_symndx, symtab_hdr, sym_hashes, 3716 h, sec, relocation, 3717 unresolved_reloc, warned); 3718 } 3719 3720 if (sec != NULL && elf_discarded_section (sec)) 3721 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 3722 rel, relend, howto, contents); 3723 3724 if (info->relocatable) 3725 continue; 3726 3727 switch (r_type) 3728 { 3729 case R_68K_GOT8: 3730 case R_68K_GOT16: 3731 case R_68K_GOT32: 3732 /* Relocation is to the address of the entry for this symbol 3733 in the global offset table. */ 3734 if (h != NULL 3735 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) 3736 { 3737 if (elf_m68k_hash_table (info)->local_gp_p) 3738 { 3739 bfd_vma sgot_output_offset; 3740 bfd_vma got_offset; 3741 3742 if (sgot == NULL) 3743 { 3744 sgot = bfd_get_section_by_name (dynobj, ".got"); 3745 3746 if (sgot != NULL) 3747 sgot_output_offset = sgot->output_offset; 3748 else 3749 /* In this case we have a reference to 3750 _GLOBAL_OFFSET_TABLE_, but the GOT itself is 3751 empty. 3752 ??? Issue a warning? */ 3753 sgot_output_offset = 0; 3754 } 3755 else 3756 sgot_output_offset = sgot->output_offset; 3757 3758 if (got == NULL) 3759 { 3760 struct elf_m68k_bfd2got_entry *bfd2got_entry; 3761 3762 bfd2got_entry 3763 = elf_m68k_get_bfd2got_entry (elf_m68k_multi_got (info), 3764 input_bfd, SEARCH, NULL); 3765 3766 if (bfd2got_entry != NULL) 3767 { 3768 got = bfd2got_entry->got; 3769 BFD_ASSERT (got != NULL); 3770 3771 got_offset = got->offset; 3772 } 3773 else 3774 /* In this case we have a reference to 3775 _GLOBAL_OFFSET_TABLE_, but no other references 3776 accessing any GOT entries. 3777 ??? Issue a warning? */ 3778 got_offset = 0; 3779 } 3780 else 3781 got_offset = got->offset; 3782 3783 /* Adjust GOT pointer to point to the GOT 3784 assigned to input_bfd. */ 3785 rel->r_addend += sgot_output_offset + got_offset; 3786 } 3787 else 3788 BFD_ASSERT (got == NULL || got->offset == 0); 3789 3790 break; 3791 } 3792 /* Fall through. */ 3793 case R_68K_GOT8O: 3794 case R_68K_GOT16O: 3795 case R_68K_GOT32O: 3796 3797 case R_68K_TLS_LDM32: 3798 case R_68K_TLS_LDM16: 3799 case R_68K_TLS_LDM8: 3800 3801 case R_68K_TLS_GD8: 3802 case R_68K_TLS_GD16: 3803 case R_68K_TLS_GD32: 3804 3805 case R_68K_TLS_IE8: 3806 case R_68K_TLS_IE16: 3807 case R_68K_TLS_IE32: 3808 3809 /* Relocation is the offset of the entry for this symbol in 3810 the global offset table. */ 3811 3812 { 3813 struct elf_m68k_got_entry_key key_; 3814 bfd_vma *off_ptr; 3815 bfd_vma off; 3816 3817 if (sgot == NULL) 3818 { 3819 sgot = bfd_get_section_by_name (dynobj, ".got"); 3820 BFD_ASSERT (sgot != NULL); 3821 } 3822 3823 if (got == NULL) 3824 { 3825 got = elf_m68k_get_bfd2got_entry (elf_m68k_multi_got (info), 3826 input_bfd, MUST_FIND, 3827 NULL)->got; 3828 BFD_ASSERT (got != NULL); 3829 } 3830 3831 /* Get GOT offset for this symbol. */ 3832 elf_m68k_init_got_entry_key (&key_, h, input_bfd, r_symndx, 3833 r_type); 3834 off_ptr = &elf_m68k_get_got_entry (got, &key_, MUST_FIND, 3835 NULL)->u.s2.offset; 3836 off = *off_ptr; 3837 3838 /* The offset must always be a multiple of 4. We use 3839 the least significant bit to record whether we have 3840 already generated the necessary reloc. */ 3841 if ((off & 1) != 0) 3842 off &= ~1; 3843 else 3844 { 3845 if (h != NULL 3846 /* @TLSLDM relocations are bounded to the module, in 3847 which the symbol is defined -- not to the symbol 3848 itself. */ 3849 && elf_m68k_reloc_got_type (r_type) != R_68K_TLS_LDM32) 3850 { 3851 bfd_boolean dyn; 3852 3853 dyn = elf_hash_table (info)->dynamic_sections_created; 3854 if (!WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) 3855 || (info->shared 3856 && SYMBOL_REFERENCES_LOCAL (info, h)) 3857 || (ELF_ST_VISIBILITY (h->other) 3858 && h->root.type == bfd_link_hash_undefweak)) 3859 { 3860 /* This is actually a static link, or it is a 3861 -Bsymbolic link and the symbol is defined 3862 locally, or the symbol was forced to be local 3863 because of a version file. We must initialize 3864 this entry in the global offset table. Since 3865 the offset must always be a multiple of 4, we 3866 use the least significant bit to record whether 3867 we have initialized it already. 3868 3869 When doing a dynamic link, we create a .rela.got 3870 relocation entry to initialize the value. This 3871 is done in the finish_dynamic_symbol routine. */ 3872 3873 elf_m68k_init_got_entry_static (info, 3874 output_bfd, 3875 r_type, 3876 sgot, 3877 off, 3878 relocation); 3879 3880 *off_ptr |= 1; 3881 } 3882 else 3883 unresolved_reloc = FALSE; 3884 } 3885 else if (info->shared) /* && h == NULL */ 3886 /* Process local symbol during dynamic link. */ 3887 { 3888 if (srela == NULL) 3889 { 3890 srela = bfd_get_section_by_name (dynobj, ".rela.got"); 3891 BFD_ASSERT (srela != NULL); 3892 } 3893 3894 elf_m68k_init_got_entry_local_shared (info, 3895 output_bfd, 3896 r_type, 3897 sgot, 3898 off, 3899 relocation, 3900 srela); 3901 3902 *off_ptr |= 1; 3903 } 3904 else /* h == NULL && !info->shared */ 3905 { 3906 elf_m68k_init_got_entry_static (info, 3907 output_bfd, 3908 r_type, 3909 sgot, 3910 off, 3911 relocation); 3912 3913 *off_ptr |= 1; 3914 } 3915 } 3916 3917 /* We don't use elf_m68k_reloc_got_type in the condition below 3918 because this is the only place where difference between 3919 R_68K_GOTx and R_68K_GOTxO relocations matters. */ 3920 if (r_type == R_68K_GOT32O 3921 || r_type == R_68K_GOT16O 3922 || r_type == R_68K_GOT8O 3923 || elf_m68k_reloc_got_type (r_type) == R_68K_TLS_GD32 3924 || elf_m68k_reloc_got_type (r_type) == R_68K_TLS_LDM32 3925 || elf_m68k_reloc_got_type (r_type) == R_68K_TLS_IE32) 3926 { 3927 /* GOT pointer is adjusted to point to the start/middle 3928 of local GOT. Adjust the offset accordingly. */ 3929 BFD_ASSERT (elf_m68k_hash_table (info)->use_neg_got_offsets_p 3930 || off >= got->offset); 3931 3932 if (elf_m68k_hash_table (info)->local_gp_p) 3933 relocation = off - got->offset; 3934 else 3935 { 3936 BFD_ASSERT (got->offset == 0); 3937 relocation = sgot->output_offset + off; 3938 } 3939 3940 /* This relocation does not use the addend. */ 3941 rel->r_addend = 0; 3942 } 3943 else 3944 relocation = (sgot->output_section->vma + sgot->output_offset 3945 + off); 3946 } 3947 break; 3948 3949 case R_68K_TLS_LDO32: 3950 case R_68K_TLS_LDO16: 3951 case R_68K_TLS_LDO8: 3952 relocation -= dtpoff_base (info); 3953 break; 3954 3955 case R_68K_TLS_LE32: 3956 case R_68K_TLS_LE16: 3957 case R_68K_TLS_LE8: 3958 if (info->shared) 3959 { 3960 (*_bfd_error_handler) 3961 (_("%B(%A+0x%lx): R_68K_TLS_LE32 relocation not permitted " 3962 "in shared object"), 3963 input_bfd, input_section, (long) rel->r_offset, howto->name); 3964 3965 return FALSE; 3966 } 3967 else 3968 relocation -= tpoff_base (info); 3969 3970 break; 3971 3972 case R_68K_PLT8: 3973 case R_68K_PLT16: 3974 case R_68K_PLT32: 3975 /* Relocation is to the entry for this symbol in the 3976 procedure linkage table. */ 3977 3978 /* Resolve a PLTxx reloc against a local symbol directly, 3979 without using the procedure linkage table. */ 3980 if (h == NULL) 3981 break; 3982 3983 if (h->plt.offset == (bfd_vma) -1 3984 || !elf_hash_table (info)->dynamic_sections_created) 3985 { 3986 /* We didn't make a PLT entry for this symbol. This 3987 happens when statically linking PIC code, or when 3988 using -Bsymbolic. */ 3989 break; 3990 } 3991 3992 if (splt == NULL) 3993 { 3994 splt = bfd_get_section_by_name (dynobj, ".plt"); 3995 BFD_ASSERT (splt != NULL); 3996 } 3997 3998 relocation = (splt->output_section->vma 3999 + splt->output_offset 4000 + h->plt.offset); 4001 unresolved_reloc = FALSE; 4002 break; 4003 4004 case R_68K_PLT8O: 4005 case R_68K_PLT16O: 4006 case R_68K_PLT32O: 4007 /* Relocation is the offset of the entry for this symbol in 4008 the procedure linkage table. */ 4009 BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1); 4010 4011 if (splt == NULL) 4012 { 4013 splt = bfd_get_section_by_name (dynobj, ".plt"); 4014 BFD_ASSERT (splt != NULL); 4015 } 4016 4017 relocation = h->plt.offset; 4018 unresolved_reloc = FALSE; 4019 4020 /* This relocation does not use the addend. */ 4021 rel->r_addend = 0; 4022 4023 break; 4024 4025 case R_68K_8: 4026 case R_68K_16: 4027 case R_68K_32: 4028 case R_68K_PC8: 4029 case R_68K_PC16: 4030 case R_68K_PC32: 4031 if (info->shared 4032 && r_symndx != STN_UNDEF 4033 && (input_section->flags & SEC_ALLOC) != 0 4034 && (h == NULL 4035 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 4036 || h->root.type != bfd_link_hash_undefweak) 4037 && ((r_type != R_68K_PC8 4038 && r_type != R_68K_PC16 4039 && r_type != R_68K_PC32) 4040 || !SYMBOL_CALLS_LOCAL (info, h))) 4041 { 4042 Elf_Internal_Rela outrel; 4043 bfd_byte *loc; 4044 bfd_boolean skip, relocate; 4045 4046 /* When generating a shared object, these relocations 4047 are copied into the output file to be resolved at run 4048 time. */ 4049 4050 skip = FALSE; 4051 relocate = FALSE; 4052 4053 outrel.r_offset = 4054 _bfd_elf_section_offset (output_bfd, info, input_section, 4055 rel->r_offset); 4056 if (outrel.r_offset == (bfd_vma) -1) 4057 skip = TRUE; 4058 else if (outrel.r_offset == (bfd_vma) -2) 4059 skip = TRUE, relocate = TRUE; 4060 outrel.r_offset += (input_section->output_section->vma 4061 + input_section->output_offset); 4062 4063 if (skip) 4064 memset (&outrel, 0, sizeof outrel); 4065 else if (h != NULL 4066 && h->dynindx != -1 4067 && (r_type == R_68K_PC8 4068 || r_type == R_68K_PC16 4069 || r_type == R_68K_PC32 4070 || !info->shared 4071 || !info->symbolic 4072 || !h->def_regular)) 4073 { 4074 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 4075 outrel.r_addend = rel->r_addend; 4076 } 4077 else 4078 { 4079 /* This symbol is local, or marked to become local. */ 4080 outrel.r_addend = relocation + rel->r_addend; 4081 4082 if (r_type == R_68K_32) 4083 { 4084 relocate = TRUE; 4085 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE); 4086 } 4087 else 4088 { 4089 long indx; 4090 4091 if (bfd_is_abs_section (sec)) 4092 indx = 0; 4093 else if (sec == NULL || sec->owner == NULL) 4094 { 4095 bfd_set_error (bfd_error_bad_value); 4096 return FALSE; 4097 } 4098 else 4099 { 4100 asection *osec; 4101 4102 /* We are turning this relocation into one 4103 against a section symbol. It would be 4104 proper to subtract the symbol's value, 4105 osec->vma, from the emitted reloc addend, 4106 but ld.so expects buggy relocs. */ 4107 osec = sec->output_section; 4108 indx = elf_section_data (osec)->dynindx; 4109 if (indx == 0) 4110 { 4111 struct elf_link_hash_table *htab; 4112 htab = elf_hash_table (info); 4113 osec = htab->text_index_section; 4114 indx = elf_section_data (osec)->dynindx; 4115 } 4116 BFD_ASSERT (indx != 0); 4117 } 4118 4119 outrel.r_info = ELF32_R_INFO (indx, r_type); 4120 } 4121 } 4122 4123 sreloc = elf_section_data (input_section)->sreloc; 4124 if (sreloc == NULL) 4125 abort (); 4126 4127 loc = sreloc->contents; 4128 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); 4129 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 4130 4131 /* This reloc will be computed at runtime, so there's no 4132 need to do anything now, except for R_68K_32 4133 relocations that have been turned into 4134 R_68K_RELATIVE. */ 4135 if (!relocate) 4136 continue; 4137 } 4138 4139 break; 4140 4141 case R_68K_GNU_VTINHERIT: 4142 case R_68K_GNU_VTENTRY: 4143 /* These are no-ops in the end. */ 4144 continue; 4145 4146 default: 4147 break; 4148 } 4149 4150 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 4151 because such sections are not SEC_ALLOC and thus ld.so will 4152 not process them. */ 4153 if (unresolved_reloc 4154 && !((input_section->flags & SEC_DEBUGGING) != 0 4155 && h->def_dynamic)) 4156 { 4157 (*_bfd_error_handler) 4158 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), 4159 input_bfd, 4160 input_section, 4161 (long) rel->r_offset, 4162 howto->name, 4163 h->root.root.string); 4164 return FALSE; 4165 } 4166 4167 if (r_symndx != STN_UNDEF 4168 && r_type != R_68K_NONE 4169 && (h == NULL 4170 || h->root.type == bfd_link_hash_defined 4171 || h->root.type == bfd_link_hash_defweak)) 4172 { 4173 char sym_type; 4174 4175 sym_type = (sym != NULL) ? ELF32_ST_TYPE (sym->st_info) : h->type; 4176 4177 if (elf_m68k_reloc_tls_p (r_type) != (sym_type == STT_TLS)) 4178 { 4179 const char *name; 4180 4181 if (h != NULL) 4182 name = h->root.root.string; 4183 else 4184 { 4185 name = (bfd_elf_string_from_elf_section 4186 (input_bfd, symtab_hdr->sh_link, sym->st_name)); 4187 if (name == NULL || *name == '\0') 4188 name = bfd_section_name (input_bfd, sec); 4189 } 4190 4191 (*_bfd_error_handler) 4192 ((sym_type == STT_TLS 4193 ? _("%B(%A+0x%lx): %s used with TLS symbol %s") 4194 : _("%B(%A+0x%lx): %s used with non-TLS symbol %s")), 4195 input_bfd, 4196 input_section, 4197 (long) rel->r_offset, 4198 howto->name, 4199 name); 4200 } 4201 } 4202 4203 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 4204 contents, rel->r_offset, 4205 relocation, rel->r_addend); 4206 4207 if (r != bfd_reloc_ok) 4208 { 4209 const char *name; 4210 4211 if (h != NULL) 4212 name = h->root.root.string; 4213 else 4214 { 4215 name = bfd_elf_string_from_elf_section (input_bfd, 4216 symtab_hdr->sh_link, 4217 sym->st_name); 4218 if (name == NULL) 4219 return FALSE; 4220 if (*name == '\0') 4221 name = bfd_section_name (input_bfd, sec); 4222 } 4223 4224 if (r == bfd_reloc_overflow) 4225 { 4226 if (!(info->callbacks->reloc_overflow 4227 (info, (h ? &h->root : NULL), name, howto->name, 4228 (bfd_vma) 0, input_bfd, input_section, 4229 rel->r_offset))) 4230 return FALSE; 4231 } 4232 else 4233 { 4234 (*_bfd_error_handler) 4235 (_("%B(%A+0x%lx): reloc against `%s': error %d"), 4236 input_bfd, input_section, 4237 (long) rel->r_offset, name, (int) r); 4238 return FALSE; 4239 } 4240 } 4241 } 4242 4243 return TRUE; 4244 } 4245 4246 /* Install an M_68K_PC32 relocation against VALUE at offset OFFSET 4247 into section SEC. */ 4248 4249 static void 4250 elf_m68k_install_pc32 (asection *sec, bfd_vma offset, bfd_vma value) 4251 { 4252 /* Make VALUE PC-relative. */ 4253 value -= sec->output_section->vma + offset; 4254 4255 /* Apply any in-place addend. */ 4256 value += bfd_get_32 (sec->owner, sec->contents + offset); 4257 4258 bfd_put_32 (sec->owner, value, sec->contents + offset); 4259 } 4260 4261 /* Finish up dynamic symbol handling. We set the contents of various 4262 dynamic sections here. */ 4263 4264 static bfd_boolean 4265 elf_m68k_finish_dynamic_symbol (output_bfd, info, h, sym) 4266 bfd *output_bfd; 4267 struct bfd_link_info *info; 4268 struct elf_link_hash_entry *h; 4269 Elf_Internal_Sym *sym; 4270 { 4271 bfd *dynobj; 4272 4273 dynobj = elf_hash_table (info)->dynobj; 4274 4275 if (h->plt.offset != (bfd_vma) -1) 4276 { 4277 const struct elf_m68k_plt_info *plt_info; 4278 asection *splt; 4279 asection *sgot; 4280 asection *srela; 4281 bfd_vma plt_index; 4282 bfd_vma got_offset; 4283 Elf_Internal_Rela rela; 4284 bfd_byte *loc; 4285 4286 /* This symbol has an entry in the procedure linkage table. Set 4287 it up. */ 4288 4289 BFD_ASSERT (h->dynindx != -1); 4290 4291 plt_info = elf_m68k_hash_table (info)->plt_info; 4292 splt = bfd_get_section_by_name (dynobj, ".plt"); 4293 sgot = bfd_get_section_by_name (dynobj, ".got.plt"); 4294 srela = bfd_get_section_by_name (dynobj, ".rela.plt"); 4295 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL); 4296 4297 /* Get the index in the procedure linkage table which 4298 corresponds to this symbol. This is the index of this symbol 4299 in all the symbols for which we are making plt entries. The 4300 first entry in the procedure linkage table is reserved. */ 4301 plt_index = (h->plt.offset / plt_info->size) - 1; 4302 4303 /* Get the offset into the .got table of the entry that 4304 corresponds to this function. Each .got entry is 4 bytes. 4305 The first three are reserved. */ 4306 got_offset = (plt_index + 3) * 4; 4307 4308 memcpy (splt->contents + h->plt.offset, 4309 plt_info->symbol_entry, 4310 plt_info->size); 4311 4312 elf_m68k_install_pc32 (splt, h->plt.offset + plt_info->symbol_relocs.got, 4313 (sgot->output_section->vma 4314 + sgot->output_offset 4315 + got_offset)); 4316 4317 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela), 4318 splt->contents 4319 + h->plt.offset 4320 + plt_info->symbol_resolve_entry + 2); 4321 4322 elf_m68k_install_pc32 (splt, h->plt.offset + plt_info->symbol_relocs.plt, 4323 splt->output_section->vma); 4324 4325 /* Fill in the entry in the global offset table. */ 4326 bfd_put_32 (output_bfd, 4327 (splt->output_section->vma 4328 + splt->output_offset 4329 + h->plt.offset 4330 + plt_info->symbol_resolve_entry), 4331 sgot->contents + got_offset); 4332 4333 /* Fill in the entry in the .rela.plt section. */ 4334 rela.r_offset = (sgot->output_section->vma 4335 + sgot->output_offset 4336 + got_offset); 4337 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT); 4338 rela.r_addend = 0; 4339 loc = srela->contents + plt_index * sizeof (Elf32_External_Rela); 4340 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 4341 4342 if (!h->def_regular) 4343 { 4344 /* Mark the symbol as undefined, rather than as defined in 4345 the .plt section. Leave the value alone. */ 4346 sym->st_shndx = SHN_UNDEF; 4347 } 4348 } 4349 4350 if (elf_m68k_hash_entry (h)->glist != NULL) 4351 { 4352 asection *sgot; 4353 asection *srela; 4354 struct elf_m68k_got_entry *got_entry; 4355 4356 /* This symbol has an entry in the global offset table. Set it 4357 up. */ 4358 4359 sgot = bfd_get_section_by_name (dynobj, ".got"); 4360 srela = bfd_get_section_by_name (dynobj, ".rela.got"); 4361 BFD_ASSERT (sgot != NULL && srela != NULL); 4362 4363 got_entry = elf_m68k_hash_entry (h)->glist; 4364 4365 while (got_entry != NULL) 4366 { 4367 enum elf_m68k_reloc_type r_type; 4368 bfd_vma got_entry_offset; 4369 4370 r_type = got_entry->key_.type; 4371 got_entry_offset = got_entry->u.s2.offset &~ (bfd_vma) 1; 4372 4373 /* If this is a -Bsymbolic link, and the symbol is defined 4374 locally, we just want to emit a RELATIVE reloc. Likewise if 4375 the symbol was forced to be local because of a version file. 4376 The entry in the global offset table already have been 4377 initialized in the relocate_section function. */ 4378 if (info->shared 4379 && SYMBOL_REFERENCES_LOCAL (info, h)) 4380 { 4381 bfd_vma relocation; 4382 4383 relocation = bfd_get_signed_32 (output_bfd, 4384 (sgot->contents 4385 + got_entry_offset)); 4386 4387 /* Undo TP bias. */ 4388 switch (elf_m68k_reloc_got_type (r_type)) 4389 { 4390 case R_68K_GOT32O: 4391 case R_68K_TLS_LDM32: 4392 break; 4393 4394 case R_68K_TLS_GD32: 4395 relocation += dtpoff_base (info); 4396 break; 4397 4398 case R_68K_TLS_IE32: 4399 relocation += tpoff_base (info); 4400 break; 4401 4402 default: 4403 BFD_ASSERT (FALSE); 4404 } 4405 4406 elf_m68k_init_got_entry_local_shared (info, 4407 output_bfd, 4408 r_type, 4409 sgot, 4410 got_entry_offset, 4411 relocation, 4412 srela); 4413 } 4414 else 4415 { 4416 Elf_Internal_Rela rela; 4417 4418 /* Put zeros to GOT slots that will be initialized 4419 at run-time. */ 4420 { 4421 bfd_vma n_slots; 4422 4423 n_slots = elf_m68k_reloc_got_n_slots (got_entry->key_.type); 4424 while (n_slots--) 4425 bfd_put_32 (output_bfd, (bfd_vma) 0, 4426 (sgot->contents + got_entry_offset 4427 + 4 * n_slots)); 4428 } 4429 4430 rela.r_addend = 0; 4431 rela.r_offset = (sgot->output_section->vma 4432 + sgot->output_offset 4433 + got_entry_offset); 4434 4435 switch (elf_m68k_reloc_got_type (r_type)) 4436 { 4437 case R_68K_GOT32O: 4438 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT); 4439 elf_m68k_install_rela (output_bfd, srela, &rela); 4440 break; 4441 4442 case R_68K_TLS_GD32: 4443 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_TLS_DTPMOD32); 4444 elf_m68k_install_rela (output_bfd, srela, &rela); 4445 4446 rela.r_offset += 4; 4447 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_TLS_DTPREL32); 4448 elf_m68k_install_rela (output_bfd, srela, &rela); 4449 break; 4450 4451 case R_68K_TLS_IE32: 4452 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_TLS_TPREL32); 4453 elf_m68k_install_rela (output_bfd, srela, &rela); 4454 break; 4455 4456 default: 4457 BFD_ASSERT (FALSE); 4458 break; 4459 } 4460 } 4461 4462 got_entry = got_entry->u.s2.next; 4463 } 4464 } 4465 4466 if (h->needs_copy) 4467 { 4468 asection *s; 4469 Elf_Internal_Rela rela; 4470 bfd_byte *loc; 4471 4472 /* This symbol needs a copy reloc. Set it up. */ 4473 4474 BFD_ASSERT (h->dynindx != -1 4475 && (h->root.type == bfd_link_hash_defined 4476 || h->root.type == bfd_link_hash_defweak)); 4477 4478 s = bfd_get_section_by_name (h->root.u.def.section->owner, 4479 ".rela.bss"); 4480 BFD_ASSERT (s != NULL); 4481 4482 rela.r_offset = (h->root.u.def.value 4483 + h->root.u.def.section->output_section->vma 4484 + h->root.u.def.section->output_offset); 4485 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY); 4486 rela.r_addend = 0; 4487 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela); 4488 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 4489 } 4490 4491 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ 4492 if (strcmp (h->root.root.string, "_DYNAMIC") == 0 4493 || h == elf_hash_table (info)->hgot) 4494 sym->st_shndx = SHN_ABS; 4495 4496 return TRUE; 4497 } 4498 4499 /* Finish up the dynamic sections. */ 4500 4501 static bfd_boolean 4502 elf_m68k_finish_dynamic_sections (output_bfd, info) 4503 bfd *output_bfd; 4504 struct bfd_link_info *info; 4505 { 4506 bfd *dynobj; 4507 asection *sgot; 4508 asection *sdyn; 4509 4510 dynobj = elf_hash_table (info)->dynobj; 4511 4512 sgot = bfd_get_section_by_name (dynobj, ".got.plt"); 4513 BFD_ASSERT (sgot != NULL); 4514 sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); 4515 4516 if (elf_hash_table (info)->dynamic_sections_created) 4517 { 4518 asection *splt; 4519 Elf32_External_Dyn *dyncon, *dynconend; 4520 4521 splt = bfd_get_section_by_name (dynobj, ".plt"); 4522 BFD_ASSERT (splt != NULL && sdyn != NULL); 4523 4524 dyncon = (Elf32_External_Dyn *) sdyn->contents; 4525 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 4526 for (; dyncon < dynconend; dyncon++) 4527 { 4528 Elf_Internal_Dyn dyn; 4529 const char *name; 4530 asection *s; 4531 4532 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 4533 4534 switch (dyn.d_tag) 4535 { 4536 default: 4537 break; 4538 4539 case DT_PLTGOT: 4540 name = ".got"; 4541 goto get_vma; 4542 case DT_JMPREL: 4543 name = ".rela.plt"; 4544 get_vma: 4545 s = bfd_get_section_by_name (output_bfd, name); 4546 BFD_ASSERT (s != NULL); 4547 dyn.d_un.d_ptr = s->vma; 4548 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 4549 break; 4550 4551 case DT_PLTRELSZ: 4552 s = bfd_get_section_by_name (output_bfd, ".rela.plt"); 4553 BFD_ASSERT (s != NULL); 4554 dyn.d_un.d_val = s->size; 4555 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 4556 break; 4557 4558 case DT_RELASZ: 4559 /* The procedure linkage table relocs (DT_JMPREL) should 4560 not be included in the overall relocs (DT_RELA). 4561 Therefore, we override the DT_RELASZ entry here to 4562 make it not include the JMPREL relocs. Since the 4563 linker script arranges for .rela.plt to follow all 4564 other relocation sections, we don't have to worry 4565 about changing the DT_RELA entry. */ 4566 s = bfd_get_section_by_name (output_bfd, ".rela.plt"); 4567 if (s != NULL) 4568 dyn.d_un.d_val -= s->size; 4569 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 4570 break; 4571 } 4572 } 4573 4574 /* Fill in the first entry in the procedure linkage table. */ 4575 if (splt->size > 0) 4576 { 4577 const struct elf_m68k_plt_info *plt_info; 4578 4579 plt_info = elf_m68k_hash_table (info)->plt_info; 4580 memcpy (splt->contents, plt_info->plt0_entry, plt_info->size); 4581 4582 elf_m68k_install_pc32 (splt, plt_info->plt0_relocs.got4, 4583 (sgot->output_section->vma 4584 + sgot->output_offset 4585 + 4)); 4586 4587 elf_m68k_install_pc32 (splt, plt_info->plt0_relocs.got8, 4588 (sgot->output_section->vma 4589 + sgot->output_offset 4590 + 8)); 4591 4592 elf_section_data (splt->output_section)->this_hdr.sh_entsize 4593 = plt_info->size; 4594 } 4595 } 4596 4597 /* Fill in the first three entries in the global offset table. */ 4598 if (sgot->size > 0) 4599 { 4600 if (sdyn == NULL) 4601 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); 4602 else 4603 bfd_put_32 (output_bfd, 4604 sdyn->output_section->vma + sdyn->output_offset, 4605 sgot->contents); 4606 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); 4607 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); 4608 } 4609 4610 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; 4611 4612 return TRUE; 4613 } 4614 4615 /* Given a .data section and a .emreloc in-memory section, store 4616 relocation information into the .emreloc section which can be 4617 used at runtime to relocate the section. This is called by the 4618 linker when the --embedded-relocs switch is used. This is called 4619 after the add_symbols entry point has been called for all the 4620 objects, and before the final_link entry point is called. */ 4621 4622 bfd_boolean 4623 bfd_m68k_elf32_create_embedded_relocs (abfd, info, datasec, relsec, errmsg) 4624 bfd *abfd; 4625 struct bfd_link_info *info; 4626 asection *datasec; 4627 asection *relsec; 4628 char **errmsg; 4629 { 4630 Elf_Internal_Shdr *symtab_hdr; 4631 Elf_Internal_Sym *isymbuf = NULL; 4632 Elf_Internal_Rela *internal_relocs = NULL; 4633 Elf_Internal_Rela *irel, *irelend; 4634 bfd_byte *p; 4635 bfd_size_type amt; 4636 4637 BFD_ASSERT (! info->relocatable); 4638 4639 *errmsg = NULL; 4640 4641 if (datasec->reloc_count == 0) 4642 return TRUE; 4643 4644 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 4645 4646 /* Get a copy of the native relocations. */ 4647 internal_relocs = (_bfd_elf_link_read_relocs 4648 (abfd, datasec, (PTR) NULL, (Elf_Internal_Rela *) NULL, 4649 info->keep_memory)); 4650 if (internal_relocs == NULL) 4651 goto error_return; 4652 4653 amt = (bfd_size_type) datasec->reloc_count * 12; 4654 relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt); 4655 if (relsec->contents == NULL) 4656 goto error_return; 4657 4658 p = relsec->contents; 4659 4660 irelend = internal_relocs + datasec->reloc_count; 4661 for (irel = internal_relocs; irel < irelend; irel++, p += 12) 4662 { 4663 asection *targetsec; 4664 4665 /* We are going to write a four byte longword into the runtime 4666 reloc section. The longword will be the address in the data 4667 section which must be relocated. It is followed by the name 4668 of the target section NUL-padded or truncated to 8 4669 characters. */ 4670 4671 /* We can only relocate absolute longword relocs at run time. */ 4672 if (ELF32_R_TYPE (irel->r_info) != (int) R_68K_32) 4673 { 4674 *errmsg = _("unsupported reloc type"); 4675 bfd_set_error (bfd_error_bad_value); 4676 goto error_return; 4677 } 4678 4679 /* Get the target section referred to by the reloc. */ 4680 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) 4681 { 4682 /* A local symbol. */ 4683 Elf_Internal_Sym *isym; 4684 4685 /* Read this BFD's local symbols if we haven't done so already. */ 4686 if (isymbuf == NULL) 4687 { 4688 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 4689 if (isymbuf == NULL) 4690 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, 4691 symtab_hdr->sh_info, 0, 4692 NULL, NULL, NULL); 4693 if (isymbuf == NULL) 4694 goto error_return; 4695 } 4696 4697 isym = isymbuf + ELF32_R_SYM (irel->r_info); 4698 targetsec = bfd_section_from_elf_index (abfd, isym->st_shndx); 4699 } 4700 else 4701 { 4702 unsigned long indx; 4703 struct elf_link_hash_entry *h; 4704 4705 /* An external symbol. */ 4706 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; 4707 h = elf_sym_hashes (abfd)[indx]; 4708 BFD_ASSERT (h != NULL); 4709 if (h->root.type == bfd_link_hash_defined 4710 || h->root.type == bfd_link_hash_defweak) 4711 targetsec = h->root.u.def.section; 4712 else 4713 targetsec = NULL; 4714 } 4715 4716 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p); 4717 memset (p + 4, 0, 8); 4718 if (targetsec != NULL) 4719 strncpy ((char *) p + 4, targetsec->output_section->name, 8); 4720 } 4721 4722 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) 4723 free (isymbuf); 4724 if (internal_relocs != NULL 4725 && elf_section_data (datasec)->relocs != internal_relocs) 4726 free (internal_relocs); 4727 return TRUE; 4728 4729 error_return: 4730 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) 4731 free (isymbuf); 4732 if (internal_relocs != NULL 4733 && elf_section_data (datasec)->relocs != internal_relocs) 4734 free (internal_relocs); 4735 return FALSE; 4736 } 4737 4738 /* Set target options. */ 4739 4740 void 4741 bfd_elf_m68k_set_target_options (struct bfd_link_info *info, int got_handling) 4742 { 4743 struct elf_m68k_link_hash_table *htab; 4744 bfd_boolean use_neg_got_offsets_p; 4745 bfd_boolean allow_multigot_p; 4746 bfd_boolean local_gp_p; 4747 4748 switch (got_handling) 4749 { 4750 case 0: 4751 /* --got=single. */ 4752 local_gp_p = FALSE; 4753 use_neg_got_offsets_p = FALSE; 4754 allow_multigot_p = FALSE; 4755 break; 4756 4757 case 1: 4758 /* --got=negative. */ 4759 local_gp_p = TRUE; 4760 use_neg_got_offsets_p = TRUE; 4761 allow_multigot_p = FALSE; 4762 break; 4763 4764 case 2: 4765 /* --got=multigot. */ 4766 local_gp_p = TRUE; 4767 use_neg_got_offsets_p = TRUE; 4768 allow_multigot_p = TRUE; 4769 break; 4770 4771 default: 4772 BFD_ASSERT (FALSE); 4773 return; 4774 } 4775 4776 htab = elf_m68k_hash_table (info); 4777 if (htab != NULL) 4778 { 4779 htab->local_gp_p = local_gp_p; 4780 htab->use_neg_got_offsets_p = use_neg_got_offsets_p; 4781 htab->allow_multigot_p = allow_multigot_p; 4782 } 4783 } 4784 4785 static enum elf_reloc_type_class 4786 elf32_m68k_reloc_type_class (rela) 4787 const Elf_Internal_Rela *rela; 4788 { 4789 switch ((int) ELF32_R_TYPE (rela->r_info)) 4790 { 4791 case R_68K_RELATIVE: 4792 return reloc_class_relative; 4793 case R_68K_JMP_SLOT: 4794 return reloc_class_plt; 4795 case R_68K_COPY: 4796 return reloc_class_copy; 4797 default: 4798 return reloc_class_normal; 4799 } 4800 } 4801 4802 /* Return address for Ith PLT stub in section PLT, for relocation REL 4803 or (bfd_vma) -1 if it should not be included. */ 4804 4805 static bfd_vma 4806 elf_m68k_plt_sym_val (bfd_vma i, const asection *plt, 4807 const arelent *rel ATTRIBUTE_UNUSED) 4808 { 4809 return plt->vma + (i + 1) * elf_m68k_get_plt_info (plt->owner)->size; 4810 } 4811 4812 #define TARGET_BIG_SYM bfd_elf32_m68k_vec 4813 #define TARGET_BIG_NAME "elf32-m68k" 4814 #define ELF_MACHINE_CODE EM_68K 4815 #define ELF_MAXPAGESIZE 0x2000 4816 #define elf_backend_create_dynamic_sections \ 4817 _bfd_elf_create_dynamic_sections 4818 #define bfd_elf32_bfd_link_hash_table_create \ 4819 elf_m68k_link_hash_table_create 4820 /* ??? Should it be this macro or bfd_elfNN_bfd_link_hash_table_create? */ 4821 #define bfd_elf32_bfd_link_hash_table_free \ 4822 elf_m68k_link_hash_table_free 4823 #define bfd_elf32_bfd_final_link bfd_elf_final_link 4824 4825 #define elf_backend_check_relocs elf_m68k_check_relocs 4826 #define elf_backend_always_size_sections \ 4827 elf_m68k_always_size_sections 4828 #define elf_backend_adjust_dynamic_symbol \ 4829 elf_m68k_adjust_dynamic_symbol 4830 #define elf_backend_size_dynamic_sections \ 4831 elf_m68k_size_dynamic_sections 4832 #define elf_backend_final_write_processing elf_m68k_final_write_processing 4833 #define elf_backend_init_index_section _bfd_elf_init_1_index_section 4834 #define elf_backend_relocate_section elf_m68k_relocate_section 4835 #define elf_backend_finish_dynamic_symbol \ 4836 elf_m68k_finish_dynamic_symbol 4837 #define elf_backend_finish_dynamic_sections \ 4838 elf_m68k_finish_dynamic_sections 4839 #define elf_backend_gc_mark_hook elf_m68k_gc_mark_hook 4840 #define elf_backend_gc_sweep_hook elf_m68k_gc_sweep_hook 4841 #define elf_backend_copy_indirect_symbol elf_m68k_copy_indirect_symbol 4842 #define bfd_elf32_bfd_merge_private_bfd_data \ 4843 elf32_m68k_merge_private_bfd_data 4844 #define bfd_elf32_bfd_set_private_flags \ 4845 elf32_m68k_set_private_flags 4846 #define bfd_elf32_bfd_print_private_bfd_data \ 4847 elf32_m68k_print_private_bfd_data 4848 #define elf_backend_reloc_type_class elf32_m68k_reloc_type_class 4849 #define elf_backend_plt_sym_val elf_m68k_plt_sym_val 4850 #define elf_backend_object_p elf32_m68k_object_p 4851 4852 #define elf_backend_can_gc_sections 1 4853 #define elf_backend_can_refcount 1 4854 #define elf_backend_want_got_plt 1 4855 #define elf_backend_plt_readonly 1 4856 #define elf_backend_want_plt_sym 0 4857 #define elf_backend_got_header_size 12 4858 #define elf_backend_rela_normal 1 4859 4860 #include "elf32-target.h" 4861
Indexes created Sat Mar 28 00:23:22 UTC 2026