1/* Motorola 68k series support for 32-bit ELF 2 Copyright (C) 1993-2017 Free Software Foundation, Inc. 3 4 This file is part of BFD, the Binary File Descriptor library. 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program; if not, write to the Free Software 18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 19 MA 02110-1301, USA. */ 20 21#include "sysdep.h" 22#include "bfd.h" 23#include "bfdlink.h" 24#include "libbfd.h" 25#include "elf-bfd.h" 26#include "elf/m68k.h" 27#include "opcode/m68k.h" 28 29static bfd_boolean 30elf_m68k_discard_copies (struct elf_link_hash_entry *, void *); 31 32static reloc_howto_type howto_table[] = 33{ 34 HOWTO(R_68K_NONE, 0, 3, 0, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_NONE", FALSE, 0, 0x00000000,FALSE), 35 HOWTO(R_68K_32, 0, 2,32, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_32", FALSE, 0, 0xffffffff,FALSE), 36 HOWTO(R_68K_16, 0, 1,16, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_16", FALSE, 0, 0x0000ffff,FALSE), 37 HOWTO(R_68K_8, 0, 0, 8, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_8", FALSE, 0, 0x000000ff,FALSE), 38 HOWTO(R_68K_PC32, 0, 2,32, TRUE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PC32", FALSE, 0, 0xffffffff,TRUE), 39 HOWTO(R_68K_PC16, 0, 1,16, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC16", FALSE, 0, 0x0000ffff,TRUE), 40 HOWTO(R_68K_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC8", FALSE, 0, 0x000000ff,TRUE), 41 HOWTO(R_68K_GOT32, 0, 2,32, TRUE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32", FALSE, 0, 0xffffffff,TRUE), 42 HOWTO(R_68K_GOT16, 0, 1,16, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16", FALSE, 0, 0x0000ffff,TRUE), 43 HOWTO(R_68K_GOT8, 0, 0, 8, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8", FALSE, 0, 0x000000ff,TRUE), 44 HOWTO(R_68K_GOT32O, 0, 2,32, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32O", FALSE, 0, 0xffffffff,FALSE), 45 HOWTO(R_68K_GOT16O, 0, 1,16, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16O", FALSE, 0, 0x0000ffff,FALSE), 46 HOWTO(R_68K_GOT8O, 0, 0, 8, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8O", FALSE, 0, 0x000000ff,FALSE), 47 HOWTO(R_68K_PLT32, 0, 2,32, TRUE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32", FALSE, 0, 0xffffffff,TRUE), 48 HOWTO(R_68K_PLT16, 0, 1,16, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16", FALSE, 0, 0x0000ffff,TRUE), 49 HOWTO(R_68K_PLT8, 0, 0, 8, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8", FALSE, 0, 0x000000ff,TRUE), 50 HOWTO(R_68K_PLT32O, 0, 2,32, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32O", FALSE, 0, 0xffffffff,FALSE), 51 HOWTO(R_68K_PLT16O, 0, 1,16, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16O", FALSE, 0, 0x0000ffff,FALSE), 52 HOWTO(R_68K_PLT8O, 0, 0, 8, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8O", FALSE, 0, 0x000000ff,FALSE), 53 HOWTO(R_68K_COPY, 0, 0, 0, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_COPY", FALSE, 0, 0xffffffff,FALSE), 54 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), 55 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), 56 HOWTO(R_68K_RELATIVE, 0, 2,32, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_RELATIVE", FALSE, 0, 0xffffffff,FALSE), 57 /* GNU extension to record C++ vtable hierarchy. */ 58 HOWTO (R_68K_GNU_VTINHERIT, /* type */ 59 0, /* rightshift */ 60 2, /* size (0 = byte, 1 = short, 2 = long) */ 61 0, /* bitsize */ 62 FALSE, /* pc_relative */ 63 0, /* bitpos */ 64 complain_overflow_dont, /* complain_on_overflow */ 65 NULL, /* special_function */ 66 "R_68K_GNU_VTINHERIT", /* name */ 67 FALSE, /* partial_inplace */ 68 0, /* src_mask */ 69 0, /* dst_mask */ 70 FALSE), 71 /* GNU extension to record C++ vtable member usage. */ 72 HOWTO (R_68K_GNU_VTENTRY, /* type */ 73 0, /* rightshift */ 74 2, /* size (0 = byte, 1 = short, 2 = long) */ 75 0, /* bitsize */ 76 FALSE, /* pc_relative */ 77 0, /* bitpos */ 78 complain_overflow_dont, /* complain_on_overflow */ 79 _bfd_elf_rel_vtable_reloc_fn, /* special_function */ 80 "R_68K_GNU_VTENTRY", /* name */ 81 FALSE, /* partial_inplace */ 82 0, /* src_mask */ 83 0, /* dst_mask */ 84 FALSE), 85 86 /* TLS general dynamic variable reference. */ 87 HOWTO (R_68K_TLS_GD32, /* type */ 88 0, /* rightshift */ 89 2, /* size (0 = byte, 1 = short, 2 = long) */ 90 32, /* bitsize */ 91 FALSE, /* pc_relative */ 92 0, /* bitpos */ 93 complain_overflow_bitfield, /* complain_on_overflow */ 94 bfd_elf_generic_reloc, /* special_function */ 95 "R_68K_TLS_GD32", /* name */ 96 FALSE, /* partial_inplace */ 97 0, /* src_mask */ 98 0xffffffff, /* dst_mask */ 99 FALSE), /* pcrel_offset */ 100 101 HOWTO (R_68K_TLS_GD16, /* type */ 102 0, /* rightshift */ 103 1, /* size (0 = byte, 1 = short, 2 = long) */ 104 16, /* bitsize */ 105 FALSE, /* pc_relative */ 106 0, /* bitpos */ 107 complain_overflow_signed, /* complain_on_overflow */ 108 bfd_elf_generic_reloc, /* special_function */ 109 "R_68K_TLS_GD16", /* name */ 110 FALSE, /* partial_inplace */ 111 0, /* src_mask */ 112 0x0000ffff, /* dst_mask */ 113 FALSE), /* pcrel_offset */ 114 115 HOWTO (R_68K_TLS_GD8, /* type */ 116 0, /* rightshift */ 117 0, /* size (0 = byte, 1 = short, 2 = long) */ 118 8, /* bitsize */ 119 FALSE, /* pc_relative */ 120 0, /* bitpos */ 121 complain_overflow_signed, /* complain_on_overflow */ 122 bfd_elf_generic_reloc, /* special_function */ 123 "R_68K_TLS_GD8", /* name */ 124 FALSE, /* partial_inplace */ 125 0, /* src_mask */ 126 0x000000ff, /* dst_mask */ 127 FALSE), /* pcrel_offset */ 128 129 /* TLS local dynamic variable reference. */ 130 HOWTO (R_68K_TLS_LDM32, /* type */ 131 0, /* rightshift */ 132 2, /* size (0 = byte, 1 = short, 2 = long) */ 133 32, /* bitsize */ 134 FALSE, /* pc_relative */ 135 0, /* bitpos */ 136 complain_overflow_bitfield, /* complain_on_overflow */ 137 bfd_elf_generic_reloc, /* special_function */ 138 "R_68K_TLS_LDM32", /* name */ 139 FALSE, /* partial_inplace */ 140 0, /* src_mask */ 141 0xffffffff, /* dst_mask */ 142 FALSE), /* pcrel_offset */ 143 144 HOWTO (R_68K_TLS_LDM16, /* type */ 145 0, /* rightshift */ 146 1, /* size (0 = byte, 1 = short, 2 = long) */ 147 16, /* bitsize */ 148 FALSE, /* pc_relative */ 149 0, /* bitpos */ 150 complain_overflow_signed, /* complain_on_overflow */ 151 bfd_elf_generic_reloc, /* special_function */ 152 "R_68K_TLS_LDM16", /* name */ 153 FALSE, /* partial_inplace */ 154 0, /* src_mask */ 155 0x0000ffff, /* dst_mask */ 156 FALSE), /* pcrel_offset */ 157 158 HOWTO (R_68K_TLS_LDM8, /* type */ 159 0, /* rightshift */ 160 0, /* size (0 = byte, 1 = short, 2 = long) */ 161 8, /* bitsize */ 162 FALSE, /* pc_relative */ 163 0, /* bitpos */ 164 complain_overflow_signed, /* complain_on_overflow */ 165 bfd_elf_generic_reloc, /* special_function */ 166 "R_68K_TLS_LDM8", /* name */ 167 FALSE, /* partial_inplace */ 168 0, /* src_mask */ 169 0x000000ff, /* dst_mask */ 170 FALSE), /* pcrel_offset */ 171 172 HOWTO (R_68K_TLS_LDO32, /* type */ 173 0, /* rightshift */ 174 2, /* size (0 = byte, 1 = short, 2 = long) */ 175 32, /* bitsize */ 176 FALSE, /* pc_relative */ 177 0, /* bitpos */ 178 complain_overflow_bitfield, /* complain_on_overflow */ 179 bfd_elf_generic_reloc, /* special_function */ 180 "R_68K_TLS_LDO32", /* name */ 181 FALSE, /* partial_inplace */ 182 0, /* src_mask */ 183 0xffffffff, /* dst_mask */ 184 FALSE), /* pcrel_offset */ 185 186 HOWTO (R_68K_TLS_LDO16, /* type */ 187 0, /* rightshift */ 188 1, /* size (0 = byte, 1 = short, 2 = long) */ 189 16, /* bitsize */ 190 FALSE, /* pc_relative */ 191 0, /* bitpos */ 192 complain_overflow_signed, /* complain_on_overflow */ 193 bfd_elf_generic_reloc, /* special_function */ 194 "R_68K_TLS_LDO16", /* name */ 195 FALSE, /* partial_inplace */ 196 0, /* src_mask */ 197 0x0000ffff, /* dst_mask */ 198 FALSE), /* pcrel_offset */ 199 200 HOWTO (R_68K_TLS_LDO8, /* type */ 201 0, /* rightshift */ 202 0, /* size (0 = byte, 1 = short, 2 = long) */ 203 8, /* bitsize */ 204 FALSE, /* pc_relative */ 205 0, /* bitpos */ 206 complain_overflow_signed, /* complain_on_overflow */ 207 bfd_elf_generic_reloc, /* special_function */ 208 "R_68K_TLS_LDO8", /* name */ 209 FALSE, /* partial_inplace */ 210 0, /* src_mask */ 211 0x000000ff, /* dst_mask */ 212 FALSE), /* pcrel_offset */ 213 214 /* TLS initial execution variable reference. */ 215 HOWTO (R_68K_TLS_IE32, /* type */ 216 0, /* rightshift */ 217 2, /* size (0 = byte, 1 = short, 2 = long) */ 218 32, /* bitsize */ 219 FALSE, /* pc_relative */ 220 0, /* bitpos */ 221 complain_overflow_bitfield, /* complain_on_overflow */ 222 bfd_elf_generic_reloc, /* special_function */ 223 "R_68K_TLS_IE32", /* name */ 224 FALSE, /* partial_inplace */ 225 0, /* src_mask */ 226 0xffffffff, /* dst_mask */ 227 FALSE), /* pcrel_offset */ 228 229 HOWTO (R_68K_TLS_IE16, /* type */ 230 0, /* rightshift */ 231 1, /* size (0 = byte, 1 = short, 2 = long) */ 232 16, /* bitsize */ 233 FALSE, /* pc_relative */ 234 0, /* bitpos */ 235 complain_overflow_signed, /* complain_on_overflow */ 236 bfd_elf_generic_reloc, /* special_function */ 237 "R_68K_TLS_IE16", /* name */ 238 FALSE, /* partial_inplace */ 239 0, /* src_mask */ 240 0x0000ffff, /* dst_mask */ 241 FALSE), /* pcrel_offset */ 242 243 HOWTO (R_68K_TLS_IE8, /* type */ 244 0, /* rightshift */ 245 0, /* size (0 = byte, 1 = short, 2 = long) */ 246 8, /* bitsize */ 247 FALSE, /* pc_relative */ 248 0, /* bitpos */ 249 complain_overflow_signed, /* complain_on_overflow */ 250 bfd_elf_generic_reloc, /* special_function */ 251 "R_68K_TLS_IE8", /* name */ 252 FALSE, /* partial_inplace */ 253 0, /* src_mask */ 254 0x000000ff, /* dst_mask */ 255 FALSE), /* pcrel_offset */ 256 257 /* TLS local execution variable reference. */ 258 HOWTO (R_68K_TLS_LE32, /* type */ 259 0, /* rightshift */ 260 2, /* size (0 = byte, 1 = short, 2 = long) */ 261 32, /* bitsize */ 262 FALSE, /* pc_relative */ 263 0, /* bitpos */ 264 complain_overflow_bitfield, /* complain_on_overflow */ 265 bfd_elf_generic_reloc, /* special_function */ 266 "R_68K_TLS_LE32", /* name */ 267 FALSE, /* partial_inplace */ 268 0, /* src_mask */ 269 0xffffffff, /* dst_mask */ 270 FALSE), /* pcrel_offset */ 271 272 HOWTO (R_68K_TLS_LE16, /* type */ 273 0, /* rightshift */ 274 1, /* size (0 = byte, 1 = short, 2 = long) */ 275 16, /* bitsize */ 276 FALSE, /* pc_relative */ 277 0, /* bitpos */ 278 complain_overflow_signed, /* complain_on_overflow */ 279 bfd_elf_generic_reloc, /* special_function */ 280 "R_68K_TLS_LE16", /* name */ 281 FALSE, /* partial_inplace */ 282 0, /* src_mask */ 283 0x0000ffff, /* dst_mask */ 284 FALSE), /* pcrel_offset */ 285 286 HOWTO (R_68K_TLS_LE8, /* type */ 287 0, /* rightshift */ 288 0, /* size (0 = byte, 1 = short, 2 = long) */ 289 8, /* bitsize */ 290 FALSE, /* pc_relative */ 291 0, /* bitpos */ 292 complain_overflow_signed, /* complain_on_overflow */ 293 bfd_elf_generic_reloc, /* special_function */ 294 "R_68K_TLS_LE8", /* name */ 295 FALSE, /* partial_inplace */ 296 0, /* src_mask */ 297 0x000000ff, /* dst_mask */ 298 FALSE), /* pcrel_offset */ 299 300 /* TLS GD/LD dynamic relocations. */ 301 HOWTO (R_68K_TLS_DTPMOD32, /* type */ 302 0, /* rightshift */ 303 2, /* size (0 = byte, 1 = short, 2 = long) */ 304 32, /* bitsize */ 305 FALSE, /* pc_relative */ 306 0, /* bitpos */ 307 complain_overflow_dont, /* complain_on_overflow */ 308 bfd_elf_generic_reloc, /* special_function */ 309 "R_68K_TLS_DTPMOD32", /* name */ 310 FALSE, /* partial_inplace */ 311 0, /* src_mask */ 312 0xffffffff, /* dst_mask */ 313 FALSE), /* pcrel_offset */ 314 315 HOWTO (R_68K_TLS_DTPREL32, /* type */ 316 0, /* rightshift */ 317 2, /* size (0 = byte, 1 = short, 2 = long) */ 318 32, /* bitsize */ 319 FALSE, /* pc_relative */ 320 0, /* bitpos */ 321 complain_overflow_dont, /* complain_on_overflow */ 322 bfd_elf_generic_reloc, /* special_function */ 323 "R_68K_TLS_DTPREL32", /* name */ 324 FALSE, /* partial_inplace */ 325 0, /* src_mask */ 326 0xffffffff, /* dst_mask */ 327 FALSE), /* pcrel_offset */ 328 329 HOWTO (R_68K_TLS_TPREL32, /* type */ 330 0, /* rightshift */ 331 2, /* size (0 = byte, 1 = short, 2 = long) */ 332 32, /* bitsize */ 333 FALSE, /* pc_relative */ 334 0, /* bitpos */ 335 complain_overflow_dont, /* complain_on_overflow */ 336 bfd_elf_generic_reloc, /* special_function */ 337 "R_68K_TLS_TPREL32", /* name */ 338 FALSE, /* partial_inplace */ 339 0, /* src_mask */ 340 0xffffffff, /* dst_mask */ 341 FALSE), /* pcrel_offset */ 342}; 343 344static void 345rtype_to_howto (bfd *abfd, arelent *cache_ptr, Elf_Internal_Rela *dst) 346{ 347 unsigned int indx = ELF32_R_TYPE (dst->r_info); 348 349 if (indx >= (unsigned int) R_68K_max) 350 { 351 /* xgettext:c-format */ 352 _bfd_error_handler (_("%B: invalid relocation type %d"), 353 abfd, (int) indx); 354 indx = R_68K_NONE; 355 } 356 cache_ptr->howto = &howto_table[indx]; 357} 358 359#define elf_info_to_howto rtype_to_howto 360 361static const struct 362{ 363 bfd_reloc_code_real_type bfd_val; 364 int elf_val; 365} 366 reloc_map[] = 367{ 368 { BFD_RELOC_NONE, R_68K_NONE }, 369 { BFD_RELOC_32, R_68K_32 }, 370 { BFD_RELOC_16, R_68K_16 }, 371 { BFD_RELOC_8, R_68K_8 }, 372 { BFD_RELOC_32_PCREL, R_68K_PC32 }, 373 { BFD_RELOC_16_PCREL, R_68K_PC16 }, 374 { BFD_RELOC_8_PCREL, R_68K_PC8 }, 375 { BFD_RELOC_32_GOT_PCREL, R_68K_GOT32 }, 376 { BFD_RELOC_16_GOT_PCREL, R_68K_GOT16 }, 377 { BFD_RELOC_8_GOT_PCREL, R_68K_GOT8 }, 378 { BFD_RELOC_32_GOTOFF, R_68K_GOT32O }, 379 { BFD_RELOC_16_GOTOFF, R_68K_GOT16O }, 380 { BFD_RELOC_8_GOTOFF, R_68K_GOT8O }, 381 { BFD_RELOC_32_PLT_PCREL, R_68K_PLT32 }, 382 { BFD_RELOC_16_PLT_PCREL, R_68K_PLT16 }, 383 { BFD_RELOC_8_PLT_PCREL, R_68K_PLT8 }, 384 { BFD_RELOC_32_PLTOFF, R_68K_PLT32O }, 385 { BFD_RELOC_16_PLTOFF, R_68K_PLT16O }, 386 { BFD_RELOC_8_PLTOFF, R_68K_PLT8O }, 387 { BFD_RELOC_NONE, R_68K_COPY }, 388 { BFD_RELOC_68K_GLOB_DAT, R_68K_GLOB_DAT }, 389 { BFD_RELOC_68K_JMP_SLOT, R_68K_JMP_SLOT }, 390 { BFD_RELOC_68K_RELATIVE, R_68K_RELATIVE }, 391 { BFD_RELOC_CTOR, R_68K_32 }, 392 { BFD_RELOC_VTABLE_INHERIT, R_68K_GNU_VTINHERIT }, 393 { BFD_RELOC_VTABLE_ENTRY, R_68K_GNU_VTENTRY }, 394 { BFD_RELOC_68K_TLS_GD32, R_68K_TLS_GD32 }, 395 { BFD_RELOC_68K_TLS_GD16, R_68K_TLS_GD16 }, 396 { BFD_RELOC_68K_TLS_GD8, R_68K_TLS_GD8 }, 397 { BFD_RELOC_68K_TLS_LDM32, R_68K_TLS_LDM32 }, 398 { BFD_RELOC_68K_TLS_LDM16, R_68K_TLS_LDM16 }, 399 { BFD_RELOC_68K_TLS_LDM8, R_68K_TLS_LDM8 }, 400 { BFD_RELOC_68K_TLS_LDO32, R_68K_TLS_LDO32 }, 401 { BFD_RELOC_68K_TLS_LDO16, R_68K_TLS_LDO16 }, 402 { BFD_RELOC_68K_TLS_LDO8, R_68K_TLS_LDO8 }, 403 { BFD_RELOC_68K_TLS_IE32, R_68K_TLS_IE32 }, 404 { BFD_RELOC_68K_TLS_IE16, R_68K_TLS_IE16 }, 405 { BFD_RELOC_68K_TLS_IE8, R_68K_TLS_IE8 }, 406 { BFD_RELOC_68K_TLS_LE32, R_68K_TLS_LE32 }, 407 { BFD_RELOC_68K_TLS_LE16, R_68K_TLS_LE16 }, 408 { BFD_RELOC_68K_TLS_LE8, R_68K_TLS_LE8 }, 409}; 410 411static reloc_howto_type * 412reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, 413 bfd_reloc_code_real_type code) 414{ 415 unsigned int i; 416 for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++) 417 { 418 if (reloc_map[i].bfd_val == code) 419 return &howto_table[reloc_map[i].elf_val]; 420 } 421 return 0; 422} 423 424static reloc_howto_type * 425reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name) 426{ 427 unsigned int i; 428 429 for (i = 0; i < sizeof (howto_table) / sizeof (howto_table[0]); i++) 430 if (howto_table[i].name != NULL 431 && strcasecmp (howto_table[i].name, r_name) == 0) 432 return &howto_table[i]; 433 434 return NULL; 435} 436 437#define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup 438#define bfd_elf32_bfd_reloc_name_lookup reloc_name_lookup 439#define ELF_ARCH bfd_arch_m68k 440#define ELF_TARGET_ID M68K_ELF_DATA 441 442/* Functions for the m68k ELF linker. */ 443 444/* The name of the dynamic interpreter. This is put in the .interp 445 section. */ 446 447#define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" 448 449/* Describes one of the various PLT styles. */ 450 451struct elf_m68k_plt_info 452{ 453 /* The size of each PLT entry. */ 454 bfd_vma size; 455 456 /* The template for the first PLT entry. */ 457 const bfd_byte *plt0_entry; 458 459 /* Offsets of fields in PLT0_ENTRY that require R_68K_PC32 relocations. 460 The comments by each member indicate the value that the relocation 461 is against. */ 462 struct { 463 unsigned int got4; /* .got + 4 */ 464 unsigned int got8; /* .got + 8 */ 465 } plt0_relocs; 466 467 /* The template for a symbol's PLT entry. */ 468 const bfd_byte *symbol_entry; 469 470 /* Offsets of fields in SYMBOL_ENTRY that require R_68K_PC32 relocations. 471 The comments by each member indicate the value that the relocation 472 is against. */ 473 struct { 474 unsigned int got; /* the symbol's .got.plt entry */ 475 unsigned int plt; /* .plt */ 476 } symbol_relocs; 477 478 /* The offset of the resolver stub from the start of SYMBOL_ENTRY. 479 The stub starts with "move.l #relocoffset,%d0". */ 480 bfd_vma symbol_resolve_entry; 481}; 482 483/* The size in bytes of an entry in the procedure linkage table. */ 484 485#define PLT_ENTRY_SIZE 20 486 487/* The first entry in a procedure linkage table looks like this. See 488 the SVR4 ABI m68k supplement to see how this works. */ 489 490static const bfd_byte elf_m68k_plt0_entry[PLT_ENTRY_SIZE] = 491{ 492 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */ 493 0, 0, 0, 2, /* + (.got + 4) - . */ 494 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,addr]) */ 495 0, 0, 0, 2, /* + (.got + 8) - . */ 496 0, 0, 0, 0 /* pad out to 20 bytes. */ 497}; 498 499/* Subsequent entries in a procedure linkage table look like this. */ 500 501static const bfd_byte elf_m68k_plt_entry[PLT_ENTRY_SIZE] = 502{ 503 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,symbol@GOTPC]) */ 504 0, 0, 0, 2, /* + (.got.plt entry) - . */ 505 0x2f, 0x3c, /* move.l #offset,-(%sp) */ 506 0, 0, 0, 0, /* + reloc index */ 507 0x60, 0xff, /* bra.l .plt */ 508 0, 0, 0, 0 /* + .plt - . */ 509}; 510 511static const struct elf_m68k_plt_info elf_m68k_plt_info = 512{ 513 PLT_ENTRY_SIZE, 514 elf_m68k_plt0_entry, { 4, 12 }, 515 elf_m68k_plt_entry, { 4, 16 }, 8 516}; 517 518#define ISAB_PLT_ENTRY_SIZE 24 519 520static const bfd_byte elf_isab_plt0_entry[ISAB_PLT_ENTRY_SIZE] = 521{ 522 0x20, 0x3c, /* move.l #offset,%d0 */ 523 0, 0, 0, 0, /* + (.got + 4) - . */ 524 0x2f, 0x3b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l),-(%sp) */ 525 0x20, 0x3c, /* move.l #offset,%d0 */ 526 0, 0, 0, 0, /* + (.got + 8) - . */ 527 0x20, 0x7b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l), %a0 */ 528 0x4e, 0xd0, /* jmp (%a0) */ 529 0x4e, 0x71 /* nop */ 530}; 531 532/* Subsequent entries in a procedure linkage table look like this. */ 533 534static const bfd_byte elf_isab_plt_entry[ISAB_PLT_ENTRY_SIZE] = 535{ 536 0x20, 0x3c, /* move.l #offset,%d0 */ 537 0, 0, 0, 0, /* + (.got.plt entry) - . */ 538 0x20, 0x7b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l), %a0 */ 539 0x4e, 0xd0, /* jmp (%a0) */ 540 0x2f, 0x3c, /* move.l #offset,-(%sp) */ 541 0, 0, 0, 0, /* + reloc index */ 542 0x60, 0xff, /* bra.l .plt */ 543 0, 0, 0, 0 /* + .plt - . */ 544}; 545 546static const struct elf_m68k_plt_info elf_isab_plt_info = 547{ 548 ISAB_PLT_ENTRY_SIZE, 549 elf_isab_plt0_entry, { 2, 12 }, 550 elf_isab_plt_entry, { 2, 20 }, 12 551}; 552 553#define ISAC_PLT_ENTRY_SIZE 24 554 555static const bfd_byte elf_isac_plt0_entry[ISAC_PLT_ENTRY_SIZE] = 556{ 557 0x20, 0x3c, /* move.l #offset,%d0 */ 558 0, 0, 0, 0, /* replaced with .got + 4 - . */ 559 0x2e, 0xbb, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l),(%sp) */ 560 0x20, 0x3c, /* move.l #offset,%d0 */ 561 0, 0, 0, 0, /* replaced with .got + 8 - . */ 562 0x20, 0x7b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l), %a0 */ 563 0x4e, 0xd0, /* jmp (%a0) */ 564 0x4e, 0x71 /* nop */ 565}; 566 567/* Subsequent entries in a procedure linkage table look like this. */ 568 569static const bfd_byte elf_isac_plt_entry[ISAC_PLT_ENTRY_SIZE] = 570{ 571 0x20, 0x3c, /* move.l #offset,%d0 */ 572 0, 0, 0, 0, /* replaced with (.got entry) - . */ 573 0x20, 0x7b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l), %a0 */ 574 0x4e, 0xd0, /* jmp (%a0) */ 575 0x2f, 0x3c, /* move.l #offset,-(%sp) */ 576 0, 0, 0, 0, /* replaced with offset into relocation table */ 577 0x61, 0xff, /* bsr.l .plt */ 578 0, 0, 0, 0 /* replaced with .plt - . */ 579}; 580 581static const struct elf_m68k_plt_info elf_isac_plt_info = 582{ 583 ISAC_PLT_ENTRY_SIZE, 584 elf_isac_plt0_entry, { 2, 12}, 585 elf_isac_plt_entry, { 2, 20 }, 12 586}; 587 588#define CPU32_PLT_ENTRY_SIZE 24 589/* Procedure linkage table entries for the cpu32 */ 590static const bfd_byte elf_cpu32_plt0_entry[CPU32_PLT_ENTRY_SIZE] = 591{ 592 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */ 593 0, 0, 0, 2, /* + (.got + 4) - . */ 594 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */ 595 0, 0, 0, 2, /* + (.got + 8) - . */ 596 0x4e, 0xd1, /* jmp %a1@ */ 597 0, 0, 0, 0, /* pad out to 24 bytes. */ 598 0, 0 599}; 600 601static const bfd_byte elf_cpu32_plt_entry[CPU32_PLT_ENTRY_SIZE] = 602{ 603 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */ 604 0, 0, 0, 2, /* + (.got.plt entry) - . */ 605 0x4e, 0xd1, /* jmp %a1@ */ 606 0x2f, 0x3c, /* move.l #offset,-(%sp) */ 607 0, 0, 0, 0, /* + reloc index */ 608 0x60, 0xff, /* bra.l .plt */ 609 0, 0, 0, 0, /* + .plt - . */ 610 0, 0 611}; 612 613static const struct elf_m68k_plt_info elf_cpu32_plt_info = 614{ 615 CPU32_PLT_ENTRY_SIZE, 616 elf_cpu32_plt0_entry, { 4, 12 }, 617 elf_cpu32_plt_entry, { 4, 18 }, 10 618}; 619 620/* The m68k linker needs to keep track of the number of relocs that it 621 decides to copy in check_relocs for each symbol. This is so that it 622 can discard PC relative relocs if it doesn't need them when linking 623 with -Bsymbolic. We store the information in a field extending the 624 regular ELF linker hash table. */ 625 626/* This structure keeps track of the number of PC relative relocs we have 627 copied for a given symbol. */ 628 629struct elf_m68k_pcrel_relocs_copied 630{ 631 /* Next section. */ 632 struct elf_m68k_pcrel_relocs_copied *next; 633 /* A section in dynobj. */ 634 asection *section; 635 /* Number of relocs copied in this section. */ 636 bfd_size_type count; 637}; 638 639/* Forward declaration. */ 640struct elf_m68k_got_entry; 641 642/* m68k ELF linker hash entry. */ 643 644struct elf_m68k_link_hash_entry 645{ 646 struct elf_link_hash_entry root; 647 648 /* Number of PC relative relocs copied for this symbol. */ 649 struct elf_m68k_pcrel_relocs_copied *pcrel_relocs_copied; 650 651 /* Key to got_entries. */ 652 unsigned long got_entry_key; 653 654 /* List of GOT entries for this symbol. This list is build during 655 offset finalization and is used within elf_m68k_finish_dynamic_symbol 656 to traverse all GOT entries for a particular symbol. 657 658 ??? We could've used root.got.glist field instead, but having 659 a separate field is cleaner. */ 660 struct elf_m68k_got_entry *glist; 661}; 662 663#define elf_m68k_hash_entry(ent) ((struct elf_m68k_link_hash_entry *) (ent)) 664 665/* Key part of GOT entry in hashtable. */ 666struct elf_m68k_got_entry_key 667{ 668 /* BFD in which this symbol was defined. NULL for global symbols. */ 669 const bfd *bfd; 670 671 /* Symbol index. Either local symbol index or h->got_entry_key. */ 672 unsigned long symndx; 673 674 /* Type is one of R_68K_GOT{8, 16, 32}O, R_68K_TLS_GD{8, 16, 32}, 675 R_68K_TLS_LDM{8, 16, 32} or R_68K_TLS_IE{8, 16, 32}. 676 677 From perspective of hashtable key, only elf_m68k_got_reloc_type (type) 678 matters. That is, we distinguish between, say, R_68K_GOT16O 679 and R_68K_GOT32O when allocating offsets, but they are considered to be 680 the same when searching got->entries. */ 681 enum elf_m68k_reloc_type type; 682}; 683 684/* Size of the GOT offset suitable for relocation. */ 685enum elf_m68k_got_offset_size { R_8, R_16, R_32, R_LAST }; 686 687/* Entry of the GOT. */ 688struct elf_m68k_got_entry 689{ 690 /* GOT entries are put into a got->entries hashtable. This is the key. */ 691 struct elf_m68k_got_entry_key key_; 692 693 /* GOT entry data. We need s1 before offset finalization and s2 after. */ 694 union 695 { 696 struct 697 { 698 /* Number of times this entry is referenced. It is used to 699 filter out unnecessary GOT slots in elf_m68k_gc_sweep_hook. */ 700 bfd_vma refcount; 701 } s1; 702 703 struct 704 { 705 /* Offset from the start of .got section. To calculate offset relative 706 to GOT pointer one should substract got->offset from this value. */ 707 bfd_vma offset; 708 709 /* Pointer to the next GOT entry for this global symbol. 710 Symbols have at most one entry in one GOT, but might 711 have entries in more than one GOT. 712 Root of this list is h->glist. 713 NULL for local symbols. */ 714 struct elf_m68k_got_entry *next; 715 } s2; 716 } u; 717}; 718 719/* Return representative type for relocation R_TYPE. 720 This is used to avoid enumerating many relocations in comparisons, 721 switches etc. */ 722 723static enum elf_m68k_reloc_type 724elf_m68k_reloc_got_type (enum elf_m68k_reloc_type r_type) 725{ 726 switch (r_type) 727 { 728 /* In most cases R_68K_GOTx relocations require the very same 729 handling as R_68K_GOT32O relocation. In cases when we need 730 to distinguish between the two, we use explicitly compare against 731 r_type. */ 732 case R_68K_GOT32: 733 case R_68K_GOT16: 734 case R_68K_GOT8: 735 case R_68K_GOT32O: 736 case R_68K_GOT16O: 737 case R_68K_GOT8O: 738 return R_68K_GOT32O; 739 740 case R_68K_TLS_GD32: 741 case R_68K_TLS_GD16: 742 case R_68K_TLS_GD8: 743 return R_68K_TLS_GD32; 744 745 case R_68K_TLS_LDM32: 746 case R_68K_TLS_LDM16: 747 case R_68K_TLS_LDM8: 748 return R_68K_TLS_LDM32; 749 750 case R_68K_TLS_IE32: 751 case R_68K_TLS_IE16: 752 case R_68K_TLS_IE8: 753 return R_68K_TLS_IE32; 754 755 default: 756 BFD_ASSERT (FALSE); 757 return 0; 758 } 759} 760 761/* Return size of the GOT entry offset for relocation R_TYPE. */ 762 763static enum elf_m68k_got_offset_size 764elf_m68k_reloc_got_offset_size (enum elf_m68k_reloc_type r_type) 765{ 766 switch (r_type) 767 { 768 case R_68K_GOT32: case R_68K_GOT16: case R_68K_GOT8: 769 case R_68K_GOT32O: case R_68K_TLS_GD32: case R_68K_TLS_LDM32: 770 case R_68K_TLS_IE32: 771 return R_32; 772 773 case R_68K_GOT16O: case R_68K_TLS_GD16: case R_68K_TLS_LDM16: 774 case R_68K_TLS_IE16: 775 return R_16; 776 777 case R_68K_GOT8O: case R_68K_TLS_GD8: case R_68K_TLS_LDM8: 778 case R_68K_TLS_IE8: 779 return R_8; 780 781 default: 782 BFD_ASSERT (FALSE); 783 return 0; 784 } 785} 786 787/* Return number of GOT entries we need to allocate in GOT for 788 relocation R_TYPE. */ 789 790static bfd_vma 791elf_m68k_reloc_got_n_slots (enum elf_m68k_reloc_type r_type) 792{ 793 switch (elf_m68k_reloc_got_type (r_type)) 794 { 795 case R_68K_GOT32O: 796 case R_68K_TLS_IE32: 797 return 1; 798 799 case R_68K_TLS_GD32: 800 case R_68K_TLS_LDM32: 801 return 2; 802 803 default: 804 BFD_ASSERT (FALSE); 805 return 0; 806 } 807} 808 809/* Return TRUE if relocation R_TYPE is a TLS one. */ 810 811static bfd_boolean 812elf_m68k_reloc_tls_p (enum elf_m68k_reloc_type r_type) 813{ 814 switch (r_type) 815 { 816 case R_68K_TLS_GD32: case R_68K_TLS_GD16: case R_68K_TLS_GD8: 817 case R_68K_TLS_LDM32: case R_68K_TLS_LDM16: case R_68K_TLS_LDM8: 818 case R_68K_TLS_LDO32: case R_68K_TLS_LDO16: case R_68K_TLS_LDO8: 819 case R_68K_TLS_IE32: case R_68K_TLS_IE16: case R_68K_TLS_IE8: 820 case R_68K_TLS_LE32: case R_68K_TLS_LE16: case R_68K_TLS_LE8: 821 case R_68K_TLS_DTPMOD32: case R_68K_TLS_DTPREL32: case R_68K_TLS_TPREL32: 822 return TRUE; 823 824 default: 825 return FALSE; 826 } 827} 828 829/* Data structure representing a single GOT. */ 830struct elf_m68k_got 831{ 832 /* Hashtable of 'struct elf_m68k_got_entry's. 833 Starting size of this table is the maximum number of 834 R_68K_GOT8O entries. */ 835 htab_t entries; 836 837 /* Number of R_x slots in this GOT. Some (e.g., TLS) entries require 838 several GOT slots. 839 840 n_slots[R_8] is the count of R_8 slots in this GOT. 841 n_slots[R_16] is the cumulative count of R_8 and R_16 slots 842 in this GOT. 843 n_slots[R_32] is the cumulative count of R_8, R_16 and R_32 slots 844 in this GOT. This is the total number of slots. */ 845 bfd_vma n_slots[R_LAST]; 846 847 /* Number of local (entry->key_.h == NULL) slots in this GOT. 848 This is only used to properly calculate size of .rela.got section; 849 see elf_m68k_partition_multi_got. */ 850 bfd_vma local_n_slots; 851 852 /* Offset of this GOT relative to beginning of .got section. */ 853 bfd_vma offset; 854}; 855 856/* BFD and its GOT. This is an entry in multi_got->bfd2got hashtable. */ 857struct elf_m68k_bfd2got_entry 858{ 859 /* BFD. */ 860 const bfd *bfd; 861 862 /* Assigned GOT. Before partitioning multi-GOT each BFD has its own 863 GOT structure. After partitioning several BFD's might [and often do] 864 share a single GOT. */ 865 struct elf_m68k_got *got; 866}; 867 868/* The main data structure holding all the pieces. */ 869struct elf_m68k_multi_got 870{ 871 /* Hashtable mapping each BFD to its GOT. If a BFD doesn't have an entry 872 here, then it doesn't need a GOT (this includes the case of a BFD 873 having an empty GOT). 874 875 ??? This hashtable can be replaced by an array indexed by bfd->id. */ 876 htab_t bfd2got; 877 878 /* Next symndx to assign a global symbol. 879 h->got_entry_key is initialized from this counter. */ 880 unsigned long global_symndx; 881}; 882 883/* m68k ELF linker hash table. */ 884 885struct elf_m68k_link_hash_table 886{ 887 struct elf_link_hash_table root; 888 889 /* Small local sym cache. */ 890 struct sym_cache sym_cache; 891 892 /* The PLT format used by this link, or NULL if the format has not 893 yet been chosen. */ 894 const struct elf_m68k_plt_info *plt_info; 895 896 /* True, if GP is loaded within each function which uses it. 897 Set to TRUE when GOT negative offsets or multi-GOT is enabled. */ 898 bfd_boolean local_gp_p; 899 900 /* Switch controlling use of negative offsets to double the size of GOTs. */ 901 bfd_boolean use_neg_got_offsets_p; 902 903 /* Switch controlling generation of multiple GOTs. */ 904 bfd_boolean allow_multigot_p; 905 906 /* Multi-GOT data structure. */ 907 struct elf_m68k_multi_got multi_got_; 908}; 909 910/* Get the m68k ELF linker hash table from a link_info structure. */ 911 912#define elf_m68k_hash_table(p) \ 913 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \ 914 == M68K_ELF_DATA ? ((struct elf_m68k_link_hash_table *) ((p)->hash)) : NULL) 915 916/* Shortcut to multi-GOT data. */ 917#define elf_m68k_multi_got(INFO) (&elf_m68k_hash_table (INFO)->multi_got_) 918 919/* Create an entry in an m68k ELF linker hash table. */ 920 921static struct bfd_hash_entry * 922elf_m68k_link_hash_newfunc (struct bfd_hash_entry *entry, 923 struct bfd_hash_table *table, 924 const char *string) 925{ 926 struct bfd_hash_entry *ret = entry; 927 928 /* Allocate the structure if it has not already been allocated by a 929 subclass. */ 930 if (ret == NULL) 931 ret = bfd_hash_allocate (table, 932 sizeof (struct elf_m68k_link_hash_entry)); 933 if (ret == NULL) 934 return ret; 935 936 /* Call the allocation method of the superclass. */ 937 ret = _bfd_elf_link_hash_newfunc (ret, table, string); 938 if (ret != NULL) 939 { 940 elf_m68k_hash_entry (ret)->pcrel_relocs_copied = NULL; 941 elf_m68k_hash_entry (ret)->got_entry_key = 0; 942 elf_m68k_hash_entry (ret)->glist = NULL; 943 } 944 945 return ret; 946} 947 948/* Destroy an m68k ELF linker hash table. */ 949 950static void 951elf_m68k_link_hash_table_free (bfd *obfd) 952{ 953 struct elf_m68k_link_hash_table *htab; 954 955 htab = (struct elf_m68k_link_hash_table *) obfd->link.hash; 956 957 if (htab->multi_got_.bfd2got != NULL) 958 { 959 htab_delete (htab->multi_got_.bfd2got); 960 htab->multi_got_.bfd2got = NULL; 961 } 962 _bfd_elf_link_hash_table_free (obfd); 963} 964 965/* Create an m68k ELF linker hash table. */ 966 967static struct bfd_link_hash_table * 968elf_m68k_link_hash_table_create (bfd *abfd) 969{ 970 struct elf_m68k_link_hash_table *ret; 971 bfd_size_type amt = sizeof (struct elf_m68k_link_hash_table); 972 973 ret = (struct elf_m68k_link_hash_table *) bfd_zmalloc (amt); 974 if (ret == (struct elf_m68k_link_hash_table *) NULL) 975 return NULL; 976 977 if (!_bfd_elf_link_hash_table_init (&ret->root, abfd, 978 elf_m68k_link_hash_newfunc, 979 sizeof (struct elf_m68k_link_hash_entry), 980 M68K_ELF_DATA)) 981 { 982 free (ret); 983 return NULL; 984 } 985 ret->root.root.hash_table_free = elf_m68k_link_hash_table_free; 986 987 ret->multi_got_.global_symndx = 1; 988 989 return &ret->root.root; 990} 991 992/* Set the right machine number. */ 993 994static bfd_boolean 995elf32_m68k_object_p (bfd *abfd) 996{ 997 unsigned int mach = 0; 998 unsigned features = 0; 999 flagword eflags = elf_elfheader (abfd)->e_flags; 1000 1001 if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_M68000) 1002 features |= m68000; 1003 else if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32) 1004 features |= cpu32; 1005 else if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO) 1006 features |= fido_a; 1007 else 1008 { 1009 switch (eflags & EF_M68K_CF_ISA_MASK) 1010 { 1011 case EF_M68K_CF_ISA_A_NODIV: 1012 features |= mcfisa_a; 1013 break; 1014 case EF_M68K_CF_ISA_A: 1015 features |= mcfisa_a|mcfhwdiv; 1016 break; 1017 case EF_M68K_CF_ISA_A_PLUS: 1018 features |= mcfisa_a|mcfisa_aa|mcfhwdiv|mcfusp; 1019 break; 1020 case EF_M68K_CF_ISA_B_NOUSP: 1021 features |= mcfisa_a|mcfisa_b|mcfhwdiv; 1022 break; 1023 case EF_M68K_CF_ISA_B: 1024 features |= mcfisa_a|mcfisa_b|mcfhwdiv|mcfusp; 1025 break; 1026 case EF_M68K_CF_ISA_C: 1027 features |= mcfisa_a|mcfisa_c|mcfhwdiv|mcfusp; 1028 break; 1029 case EF_M68K_CF_ISA_C_NODIV: 1030 features |= mcfisa_a|mcfisa_c|mcfusp; 1031 break; 1032 } 1033 switch (eflags & EF_M68K_CF_MAC_MASK) 1034 { 1035 case EF_M68K_CF_MAC: 1036 features |= mcfmac; 1037 break; 1038 case EF_M68K_CF_EMAC: 1039 features |= mcfemac; 1040 break; 1041 } 1042 if (eflags & EF_M68K_CF_FLOAT) 1043 features |= cfloat; 1044 } 1045 1046 mach = bfd_m68k_features_to_mach (features); 1047 bfd_default_set_arch_mach (abfd, bfd_arch_m68k, mach); 1048 1049 return TRUE; 1050} 1051 1052/* Somewhat reverse of elf32_m68k_object_p, this sets the e_flag 1053 field based on the machine number. */ 1054 1055static void 1056elf_m68k_final_write_processing (bfd *abfd, 1057 bfd_boolean linker ATTRIBUTE_UNUSED) 1058{ 1059 int mach = bfd_get_mach (abfd); 1060 unsigned long e_flags = elf_elfheader (abfd)->e_flags; 1061 1062 if (!e_flags) 1063 { 1064 unsigned int arch_mask; 1065 1066 arch_mask = bfd_m68k_mach_to_features (mach); 1067 1068 if (arch_mask & m68000) 1069 e_flags = EF_M68K_M68000; 1070 else if (arch_mask & cpu32) 1071 e_flags = EF_M68K_CPU32; 1072 else if (arch_mask & fido_a) 1073 e_flags = EF_M68K_FIDO; 1074 else 1075 { 1076 switch (arch_mask 1077 & (mcfisa_a | mcfisa_aa | mcfisa_b | mcfisa_c | mcfhwdiv | mcfusp)) 1078 { 1079 case mcfisa_a: 1080 e_flags |= EF_M68K_CF_ISA_A_NODIV; 1081 break; 1082 case mcfisa_a | mcfhwdiv: 1083 e_flags |= EF_M68K_CF_ISA_A; 1084 break; 1085 case mcfisa_a | mcfisa_aa | mcfhwdiv | mcfusp: 1086 e_flags |= EF_M68K_CF_ISA_A_PLUS; 1087 break; 1088 case mcfisa_a | mcfisa_b | mcfhwdiv: 1089 e_flags |= EF_M68K_CF_ISA_B_NOUSP; 1090 break; 1091 case mcfisa_a | mcfisa_b | mcfhwdiv | mcfusp: 1092 e_flags |= EF_M68K_CF_ISA_B; 1093 break; 1094 case mcfisa_a | mcfisa_c | mcfhwdiv | mcfusp: 1095 e_flags |= EF_M68K_CF_ISA_C; 1096 break; 1097 case mcfisa_a | mcfisa_c | mcfusp: 1098 e_flags |= EF_M68K_CF_ISA_C_NODIV; 1099 break; 1100 } 1101 if (arch_mask & mcfmac) 1102 e_flags |= EF_M68K_CF_MAC; 1103 else if (arch_mask & mcfemac) 1104 e_flags |= EF_M68K_CF_EMAC; 1105 if (arch_mask & cfloat) 1106 e_flags |= EF_M68K_CF_FLOAT | EF_M68K_CFV4E; 1107 } 1108 elf_elfheader (abfd)->e_flags = e_flags; 1109 } 1110} 1111 1112/* Keep m68k-specific flags in the ELF header. */ 1113 1114static bfd_boolean 1115elf32_m68k_set_private_flags (bfd *abfd, flagword flags) 1116{ 1117 elf_elfheader (abfd)->e_flags = flags; 1118 elf_flags_init (abfd) = TRUE; 1119 return TRUE; 1120} 1121 1122/* Merge backend specific data from an object file to the output 1123 object file when linking. */ 1124static bfd_boolean 1125elf32_m68k_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info) 1126{ 1127 bfd *obfd = info->output_bfd; 1128 flagword out_flags; 1129 flagword in_flags; 1130 flagword out_isa; 1131 flagword in_isa; 1132 const bfd_arch_info_type *arch_info; 1133 1134 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour 1135 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 1136 return FALSE; 1137 1138 /* Get the merged machine. This checks for incompatibility between 1139 Coldfire & non-Coldfire flags, incompability between different 1140 Coldfire ISAs, and incompability between different MAC types. */ 1141 arch_info = bfd_arch_get_compatible (ibfd, obfd, FALSE); 1142 if (!arch_info) 1143 return FALSE; 1144 1145 bfd_set_arch_mach (obfd, bfd_arch_m68k, arch_info->mach); 1146 1147 in_flags = elf_elfheader (ibfd)->e_flags; 1148 if (!elf_flags_init (obfd)) 1149 { 1150 elf_flags_init (obfd) = TRUE; 1151 out_flags = in_flags; 1152 } 1153 else 1154 { 1155 out_flags = elf_elfheader (obfd)->e_flags; 1156 unsigned int variant_mask; 1157 1158 if ((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_M68000) 1159 variant_mask = 0; 1160 else if ((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32) 1161 variant_mask = 0; 1162 else if ((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO) 1163 variant_mask = 0; 1164 else 1165 variant_mask = EF_M68K_CF_ISA_MASK; 1166 1167 in_isa = (in_flags & variant_mask); 1168 out_isa = (out_flags & variant_mask); 1169 if (in_isa > out_isa) 1170 out_flags ^= in_isa ^ out_isa; 1171 if (((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32 1172 && (out_flags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO) 1173 || ((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO 1174 && (out_flags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32)) 1175 out_flags = EF_M68K_FIDO; 1176 else 1177 out_flags |= in_flags ^ in_isa; 1178 } 1179 elf_elfheader (obfd)->e_flags = out_flags; 1180 1181 return TRUE; 1182} 1183 1184/* Display the flags field. */ 1185 1186static bfd_boolean 1187elf32_m68k_print_private_bfd_data (bfd *abfd, void * ptr) 1188{ 1189 FILE *file = (FILE *) ptr; 1190 flagword eflags = elf_elfheader (abfd)->e_flags; 1191 1192 BFD_ASSERT (abfd != NULL && ptr != NULL); 1193 1194 /* Print normal ELF private data. */ 1195 _bfd_elf_print_private_bfd_data (abfd, ptr); 1196 1197 /* Ignore init flag - it may not be set, despite the flags field containing valid data. */ 1198 1199 /* xgettext:c-format */ 1200 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); 1201 1202 if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_M68000) 1203 fprintf (file, " [m68000]"); 1204 else if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32) 1205 fprintf (file, " [cpu32]"); 1206 else if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO) 1207 fprintf (file, " [fido]"); 1208 else 1209 { 1210 if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_CFV4E) 1211 fprintf (file, " [cfv4e]"); 1212 1213 if (eflags & EF_M68K_CF_ISA_MASK) 1214 { 1215 char const *isa = _("unknown"); 1216 char const *mac = _("unknown"); 1217 char const *additional = ""; 1218 1219 switch (eflags & EF_M68K_CF_ISA_MASK) 1220 { 1221 case EF_M68K_CF_ISA_A_NODIV: 1222 isa = "A"; 1223 additional = " [nodiv]"; 1224 break; 1225 case EF_M68K_CF_ISA_A: 1226 isa = "A"; 1227 break; 1228 case EF_M68K_CF_ISA_A_PLUS: 1229 isa = "A+"; 1230 break; 1231 case EF_M68K_CF_ISA_B_NOUSP: 1232 isa = "B"; 1233 additional = " [nousp]"; 1234 break; 1235 case EF_M68K_CF_ISA_B: 1236 isa = "B"; 1237 break; 1238 case EF_M68K_CF_ISA_C: 1239 isa = "C"; 1240 break; 1241 case EF_M68K_CF_ISA_C_NODIV: 1242 isa = "C"; 1243 additional = " [nodiv]"; 1244 break; 1245 } 1246 fprintf (file, " [isa %s]%s", isa, additional); 1247 1248 if (eflags & EF_M68K_CF_FLOAT) 1249 fprintf (file, " [float]"); 1250 1251 switch (eflags & EF_M68K_CF_MAC_MASK) 1252 { 1253 case 0: 1254 mac = NULL; 1255 break; 1256 case EF_M68K_CF_MAC: 1257 mac = "mac"; 1258 break; 1259 case EF_M68K_CF_EMAC: 1260 mac = "emac"; 1261 break; 1262 case EF_M68K_CF_EMAC_B: 1263 mac = "emac_b"; 1264 break; 1265 } 1266 if (mac) 1267 fprintf (file, " [%s]", mac); 1268 } 1269 } 1270 1271 fputc ('\n', file); 1272 1273 return TRUE; 1274} 1275 1276/* Multi-GOT support implementation design: 1277 1278 Multi-GOT starts in check_relocs hook. There we scan all 1279 relocations of a BFD and build a local GOT (struct elf_m68k_got) 1280 for it. If a single BFD appears to require too many GOT slots with 1281 R_68K_GOT8O or R_68K_GOT16O relocations, we fail with notification 1282 to user. 1283 After check_relocs has been invoked for each input BFD, we have 1284 constructed a GOT for each input BFD. 1285 1286 To minimize total number of GOTs required for a particular output BFD 1287 (as some environments support only 1 GOT per output object) we try 1288 to merge some of the GOTs to share an offset space. Ideally [and in most 1289 cases] we end up with a single GOT. In cases when there are too many 1290 restricted relocations (e.g., R_68K_GOT16O relocations) we end up with 1291 several GOTs, assuming the environment can handle them. 1292 1293 Partitioning is done in elf_m68k_partition_multi_got. We start with 1294 an empty GOT and traverse bfd2got hashtable putting got_entries from 1295 local GOTs to the new 'big' one. We do that by constructing an 1296 intermediate GOT holding all the entries the local GOT has and the big 1297 GOT lacks. Then we check if there is room in the big GOT to accomodate 1298 all the entries from diff. On success we add those entries to the big 1299 GOT; on failure we start the new 'big' GOT and retry the adding of 1300 entries from the local GOT. Note that this retry will always succeed as 1301 each local GOT doesn't overflow the limits. After partitioning we 1302 end up with each bfd assigned one of the big GOTs. GOT entries in the 1303 big GOTs are initialized with GOT offsets. Note that big GOTs are 1304 positioned consequently in program space and represent a single huge GOT 1305 to the outside world. 1306 1307 After that we get to elf_m68k_relocate_section. There we 1308 adjust relocations of GOT pointer (_GLOBAL_OFFSET_TABLE_) and symbol 1309 relocations to refer to appropriate [assigned to current input_bfd] 1310 big GOT. 1311 1312 Notes: 1313 1314 GOT entry type: We have several types of GOT entries. 1315 * R_8 type is used in entries for symbols that have at least one 1316 R_68K_GOT8O or R_68K_TLS_*8 relocation. We can have at most 0x40 1317 such entries in one GOT. 1318 * R_16 type is used in entries for symbols that have at least one 1319 R_68K_GOT16O or R_68K_TLS_*16 relocation and no R_8 relocations. 1320 We can have at most 0x4000 such entries in one GOT. 1321 * R_32 type is used in all other cases. We can have as many 1322 such entries in one GOT as we'd like. 1323 When counting relocations we have to include the count of the smaller 1324 ranged relocations in the counts of the larger ranged ones in order 1325 to correctly detect overflow. 1326 1327 Sorting the GOT: In each GOT starting offsets are assigned to 1328 R_8 entries, which are followed by R_16 entries, and 1329 R_32 entries go at the end. See finalize_got_offsets for details. 1330 1331 Negative GOT offsets: To double usable offset range of GOTs we use 1332 negative offsets. As we assign entries with GOT offsets relative to 1333 start of .got section, the offset values are positive. They become 1334 negative only in relocate_section where got->offset value is 1335 subtracted from them. 1336 1337 3 special GOT entries: There are 3 special GOT entries used internally 1338 by loader. These entries happen to be placed to .got.plt section, 1339 so we don't do anything about them in multi-GOT support. 1340 1341 Memory management: All data except for hashtables 1342 multi_got->bfd2got and got->entries are allocated on 1343 elf_hash_table (info)->dynobj bfd (for this reason we pass 'info' 1344 to most functions), so we don't need to care to free them. At the 1345 moment of allocation hashtables are being linked into main data 1346 structure (multi_got), all pieces of which are reachable from 1347 elf_m68k_multi_got (info). We deallocate them in 1348 elf_m68k_link_hash_table_free. */ 1349 1350/* Initialize GOT. */ 1351 1352static void 1353elf_m68k_init_got (struct elf_m68k_got *got) 1354{ 1355 got->entries = NULL; 1356 got->n_slots[R_8] = 0; 1357 got->n_slots[R_16] = 0; 1358 got->n_slots[R_32] = 0; 1359 got->local_n_slots = 0; 1360 got->offset = (bfd_vma) -1; 1361} 1362 1363/* Destruct GOT. */ 1364 1365static void 1366elf_m68k_clear_got (struct elf_m68k_got *got) 1367{ 1368 if (got->entries != NULL) 1369 { 1370 htab_delete (got->entries); 1371 got->entries = NULL; 1372 } 1373} 1374 1375/* Create and empty GOT structure. INFO is the context where memory 1376 should be allocated. */ 1377 1378static struct elf_m68k_got * 1379elf_m68k_create_empty_got (struct bfd_link_info *info) 1380{ 1381 struct elf_m68k_got *got; 1382 1383 got = bfd_alloc (elf_hash_table (info)->dynobj, sizeof (*got)); 1384 if (got == NULL) 1385 return NULL; 1386 1387 elf_m68k_init_got (got); 1388 1389 return got; 1390} 1391 1392/* Initialize KEY. */ 1393 1394static void 1395elf_m68k_init_got_entry_key (struct elf_m68k_got_entry_key *key, 1396 struct elf_link_hash_entry *h, 1397 const bfd *abfd, unsigned long symndx, 1398 enum elf_m68k_reloc_type reloc_type) 1399{ 1400 if (elf_m68k_reloc_got_type (reloc_type) == R_68K_TLS_LDM32) 1401 /* All TLS_LDM relocations share a single GOT entry. */ 1402 { 1403 key->bfd = NULL; 1404 key->symndx = 0; 1405 } 1406 else if (h != NULL) 1407 /* Global symbols are identified with their got_entry_key. */ 1408 { 1409 key->bfd = NULL; 1410 key->symndx = elf_m68k_hash_entry (h)->got_entry_key; 1411 BFD_ASSERT (key->symndx != 0); 1412 } 1413 else 1414 /* Local symbols are identified by BFD they appear in and symndx. */ 1415 { 1416 key->bfd = abfd; 1417 key->symndx = symndx; 1418 } 1419 1420 key->type = reloc_type; 1421} 1422 1423/* Calculate hash of got_entry. 1424 ??? Is it good? */ 1425 1426static hashval_t 1427elf_m68k_got_entry_hash (const void *_entry) 1428{ 1429 const struct elf_m68k_got_entry_key *key; 1430 1431 key = &((const struct elf_m68k_got_entry *) _entry)->key_; 1432 1433 return (key->symndx 1434 + (key->bfd != NULL ? (int) key->bfd->id : -1) 1435 + elf_m68k_reloc_got_type (key->type)); 1436} 1437 1438/* Check if two got entries are equal. */ 1439 1440static int 1441elf_m68k_got_entry_eq (const void *_entry1, const void *_entry2) 1442{ 1443 const struct elf_m68k_got_entry_key *key1; 1444 const struct elf_m68k_got_entry_key *key2; 1445 1446 key1 = &((const struct elf_m68k_got_entry *) _entry1)->key_; 1447 key2 = &((const struct elf_m68k_got_entry *) _entry2)->key_; 1448 1449 return (key1->bfd == key2->bfd 1450 && key1->symndx == key2->symndx 1451 && (elf_m68k_reloc_got_type (key1->type) 1452 == elf_m68k_reloc_got_type (key2->type))); 1453} 1454 1455/* When using negative offsets, we allocate one extra R_8, one extra R_16 1456 and one extra R_32 slots to simplify handling of 2-slot entries during 1457 offset allocation -- hence -1 for R_8 slots and -2 for R_16 slots. */ 1458 1459/* Maximal number of R_8 slots in a single GOT. */ 1460#define ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT(INFO) \ 1461 (elf_m68k_hash_table (INFO)->use_neg_got_offsets_p \ 1462 ? (0x40 - 1) \ 1463 : 0x20) 1464 1465/* Maximal number of R_8 and R_16 slots in a single GOT. */ 1466#define ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT(INFO) \ 1467 (elf_m68k_hash_table (INFO)->use_neg_got_offsets_p \ 1468 ? (0x4000 - 2) \ 1469 : 0x2000) 1470 1471/* SEARCH - simply search the hashtable, don't insert new entries or fail when 1472 the entry cannot be found. 1473 FIND_OR_CREATE - search for an existing entry, but create new if there's 1474 no such. 1475 MUST_FIND - search for an existing entry and assert that it exist. 1476 MUST_CREATE - assert that there's no such entry and create new one. */ 1477enum elf_m68k_get_entry_howto 1478 { 1479 SEARCH, 1480 FIND_OR_CREATE, 1481 MUST_FIND, 1482 MUST_CREATE 1483 }; 1484 1485/* Get or create (depending on HOWTO) entry with KEY in GOT. 1486 INFO is context in which memory should be allocated (can be NULL if 1487 HOWTO is SEARCH or MUST_FIND). */ 1488 1489static struct elf_m68k_got_entry * 1490elf_m68k_get_got_entry (struct elf_m68k_got *got, 1491 const struct elf_m68k_got_entry_key *key, 1492 enum elf_m68k_get_entry_howto howto, 1493 struct bfd_link_info *info) 1494{ 1495 struct elf_m68k_got_entry entry_; 1496 struct elf_m68k_got_entry *entry; 1497 void **ptr; 1498 1499 BFD_ASSERT ((info == NULL) == (howto == SEARCH || howto == MUST_FIND)); 1500 1501 if (got->entries == NULL) 1502 /* This is the first entry in ABFD. Initialize hashtable. */ 1503 { 1504 if (howto == SEARCH) 1505 return NULL; 1506 1507 got->entries = htab_try_create (ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT 1508 (info), 1509 elf_m68k_got_entry_hash, 1510 elf_m68k_got_entry_eq, NULL); 1511 if (got->entries == NULL) 1512 { 1513 bfd_set_error (bfd_error_no_memory); 1514 return NULL; 1515 } 1516 } 1517 1518 entry_.key_ = *key; 1519 ptr = htab_find_slot (got->entries, &entry_, (howto != SEARCH 1520 ? INSERT : NO_INSERT)); 1521 if (ptr == NULL) 1522 { 1523 if (howto == SEARCH) 1524 /* Entry not found. */ 1525 return NULL; 1526 1527 /* We're out of memory. */ 1528 bfd_set_error (bfd_error_no_memory); 1529 return NULL; 1530 } 1531 1532 if (*ptr == NULL) 1533 /* We didn't find the entry and we're asked to create a new one. */ 1534 { 1535 BFD_ASSERT (howto != MUST_FIND && howto != SEARCH); 1536 1537 entry = bfd_alloc (elf_hash_table (info)->dynobj, sizeof (*entry)); 1538 if (entry == NULL) 1539 return NULL; 1540 1541 /* Initialize new entry. */ 1542 entry->key_ = *key; 1543 1544 entry->u.s1.refcount = 0; 1545 1546 /* Mark the entry as not initialized. */ 1547 entry->key_.type = R_68K_max; 1548 1549 *ptr = entry; 1550 } 1551 else 1552 /* We found the entry. */ 1553 { 1554 BFD_ASSERT (howto != MUST_CREATE); 1555 1556 entry = *ptr; 1557 } 1558 1559 return entry; 1560} 1561 1562/* Update GOT counters when merging entry of WAS type with entry of NEW type. 1563 Return the value to which ENTRY's type should be set. */ 1564 1565static enum elf_m68k_reloc_type 1566elf_m68k_update_got_entry_type (struct elf_m68k_got *got, 1567 enum elf_m68k_reloc_type was, 1568 enum elf_m68k_reloc_type new_reloc) 1569{ 1570 enum elf_m68k_got_offset_size was_size; 1571 enum elf_m68k_got_offset_size new_size; 1572 bfd_vma n_slots; 1573 1574 if (was == R_68K_max) 1575 /* The type of the entry is not initialized yet. */ 1576 { 1577 /* Update all got->n_slots counters, including n_slots[R_32]. */ 1578 was_size = R_LAST; 1579 1580 was = new_reloc; 1581 } 1582 else 1583 { 1584 /* !!! We, probably, should emit an error rather then fail on assert 1585 in such a case. */ 1586 BFD_ASSERT (elf_m68k_reloc_got_type (was) 1587 == elf_m68k_reloc_got_type (new_reloc)); 1588 1589 was_size = elf_m68k_reloc_got_offset_size (was); 1590 } 1591 1592 new_size = elf_m68k_reloc_got_offset_size (new_reloc); 1593 n_slots = elf_m68k_reloc_got_n_slots (new_reloc); 1594 1595 while (was_size > new_size) 1596 { 1597 --was_size; 1598 got->n_slots[was_size] += n_slots; 1599 } 1600 1601 if (new_reloc > was) 1602 /* Relocations are ordered from bigger got offset size to lesser, 1603 so choose the relocation type with lesser offset size. */ 1604 was = new_reloc; 1605 1606 return was; 1607} 1608 1609/* Update GOT counters when removing an entry of type TYPE. */ 1610 1611static void 1612elf_m68k_remove_got_entry_type (struct elf_m68k_got *got, 1613 enum elf_m68k_reloc_type type) 1614{ 1615 enum elf_m68k_got_offset_size os; 1616 bfd_vma n_slots; 1617 1618 n_slots = elf_m68k_reloc_got_n_slots (type); 1619 1620 /* Decrese counter of slots with offset size corresponding to TYPE 1621 and all greater offset sizes. */ 1622 for (os = elf_m68k_reloc_got_offset_size (type); os <= R_32; ++os) 1623 { 1624 BFD_ASSERT (got->n_slots[os] >= n_slots); 1625 1626 got->n_slots[os] -= n_slots; 1627 } 1628} 1629 1630/* Add new or update existing entry to GOT. 1631 H, ABFD, TYPE and SYMNDX is data for the entry. 1632 INFO is a context where memory should be allocated. */ 1633 1634static struct elf_m68k_got_entry * 1635elf_m68k_add_entry_to_got (struct elf_m68k_got *got, 1636 struct elf_link_hash_entry *h, 1637 const bfd *abfd, 1638 enum elf_m68k_reloc_type reloc_type, 1639 unsigned long symndx, 1640 struct bfd_link_info *info) 1641{ 1642 struct elf_m68k_got_entry_key key_; 1643 struct elf_m68k_got_entry *entry; 1644 1645 if (h != NULL && elf_m68k_hash_entry (h)->got_entry_key == 0) 1646 elf_m68k_hash_entry (h)->got_entry_key 1647 = elf_m68k_multi_got (info)->global_symndx++; 1648 1649 elf_m68k_init_got_entry_key (&key_, h, abfd, symndx, reloc_type); 1650 1651 entry = elf_m68k_get_got_entry (got, &key_, FIND_OR_CREATE, info); 1652 if (entry == NULL) 1653 return NULL; 1654 1655 /* Determine entry's type and update got->n_slots counters. */ 1656 entry->key_.type = elf_m68k_update_got_entry_type (got, 1657 entry->key_.type, 1658 reloc_type); 1659 1660 /* Update refcount. */ 1661 ++entry->u.s1.refcount; 1662 1663 if (entry->u.s1.refcount == 1) 1664 /* We see this entry for the first time. */ 1665 { 1666 if (entry->key_.bfd != NULL) 1667 got->local_n_slots += elf_m68k_reloc_got_n_slots (entry->key_.type); 1668 } 1669 1670 BFD_ASSERT (got->n_slots[R_32] >= got->local_n_slots); 1671 1672 if ((got->n_slots[R_8] 1673 > ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info)) 1674 || (got->n_slots[R_16] 1675 > ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT (info))) 1676 /* This BFD has too many relocation. */ 1677 { 1678 if (got->n_slots[R_8] > ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info)) 1679 /* xgettext:c-format */ 1680 _bfd_error_handler (_("%B: GOT overflow: " 1681 "Number of relocations with 8-bit " 1682 "offset > %d"), 1683 abfd, 1684 ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info)); 1685 else 1686 /* xgettext:c-format */ 1687 _bfd_error_handler (_("%B: GOT overflow: " 1688 "Number of relocations with 8- or 16-bit " 1689 "offset > %d"), 1690 abfd, 1691 ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT (info)); 1692 1693 return NULL; 1694 } 1695 1696 return entry; 1697} 1698 1699/* Compute the hash value of the bfd in a bfd2got hash entry. */ 1700 1701static hashval_t 1702elf_m68k_bfd2got_entry_hash (const void *entry) 1703{ 1704 const struct elf_m68k_bfd2got_entry *e; 1705 1706 e = (const struct elf_m68k_bfd2got_entry *) entry; 1707 1708 return e->bfd->id; 1709} 1710 1711/* Check whether two hash entries have the same bfd. */ 1712 1713static int 1714elf_m68k_bfd2got_entry_eq (const void *entry1, const void *entry2) 1715{ 1716 const struct elf_m68k_bfd2got_entry *e1; 1717 const struct elf_m68k_bfd2got_entry *e2; 1718 1719 e1 = (const struct elf_m68k_bfd2got_entry *) entry1; 1720 e2 = (const struct elf_m68k_bfd2got_entry *) entry2; 1721 1722 return e1->bfd == e2->bfd; 1723} 1724 1725/* Destruct a bfd2got entry. */ 1726 1727static void 1728elf_m68k_bfd2got_entry_del (void *_entry) 1729{ 1730 struct elf_m68k_bfd2got_entry *entry; 1731 1732 entry = (struct elf_m68k_bfd2got_entry *) _entry; 1733 1734 BFD_ASSERT (entry->got != NULL); 1735 elf_m68k_clear_got (entry->got); 1736} 1737 1738/* Find existing or create new (depending on HOWTO) bfd2got entry in 1739 MULTI_GOT. ABFD is the bfd we need a GOT for. INFO is a context where 1740 memory should be allocated. */ 1741 1742static struct elf_m68k_bfd2got_entry * 1743elf_m68k_get_bfd2got_entry (struct elf_m68k_multi_got *multi_got, 1744 const bfd *abfd, 1745 enum elf_m68k_get_entry_howto howto, 1746 struct bfd_link_info *info) 1747{ 1748 struct elf_m68k_bfd2got_entry entry_; 1749 void **ptr; 1750 struct elf_m68k_bfd2got_entry *entry; 1751 1752 BFD_ASSERT ((info == NULL) == (howto == SEARCH || howto == MUST_FIND)); 1753 1754 if (multi_got->bfd2got == NULL) 1755 /* This is the first GOT. Initialize bfd2got. */ 1756 { 1757 if (howto == SEARCH) 1758 return NULL; 1759 1760 multi_got->bfd2got = htab_try_create (1, elf_m68k_bfd2got_entry_hash, 1761 elf_m68k_bfd2got_entry_eq, 1762 elf_m68k_bfd2got_entry_del); 1763 if (multi_got->bfd2got == NULL) 1764 { 1765 bfd_set_error (bfd_error_no_memory); 1766 return NULL; 1767 } 1768 } 1769 1770 entry_.bfd = abfd; 1771 ptr = htab_find_slot (multi_got->bfd2got, &entry_, (howto != SEARCH 1772 ? INSERT : NO_INSERT)); 1773 if (ptr == NULL) 1774 { 1775 if (howto == SEARCH) 1776 /* Entry not found. */ 1777 return NULL; 1778 1779 /* We're out of memory. */ 1780 bfd_set_error (bfd_error_no_memory); 1781 return NULL; 1782 } 1783 1784 if (*ptr == NULL) 1785 /* Entry was not found. Create new one. */ 1786 { 1787 BFD_ASSERT (howto != MUST_FIND && howto != SEARCH); 1788 1789 entry = ((struct elf_m68k_bfd2got_entry *) 1790 bfd_alloc (elf_hash_table (info)->dynobj, sizeof (*entry))); 1791 if (entry == NULL) 1792 return NULL; 1793 1794 entry->bfd = abfd; 1795 1796 entry->got = elf_m68k_create_empty_got (info); 1797 if (entry->got == NULL) 1798 return NULL; 1799 1800 *ptr = entry; 1801 } 1802 else 1803 { 1804 BFD_ASSERT (howto != MUST_CREATE); 1805 1806 /* Return existing entry. */ 1807 entry = *ptr; 1808 } 1809 1810 return entry; 1811} 1812 1813struct elf_m68k_can_merge_gots_arg 1814{ 1815 /* A current_got that we constructing a DIFF against. */ 1816 struct elf_m68k_got *big; 1817 1818 /* GOT holding entries not present or that should be changed in 1819 BIG. */ 1820 struct elf_m68k_got *diff; 1821 1822 /* Context where to allocate memory. */ 1823 struct bfd_link_info *info; 1824 1825 /* Error flag. */ 1826 bfd_boolean error_p; 1827}; 1828 1829/* Process a single entry from the small GOT to see if it should be added 1830 or updated in the big GOT. */ 1831 1832static int 1833elf_m68k_can_merge_gots_1 (void **_entry_ptr, void *_arg) 1834{ 1835 const struct elf_m68k_got_entry *entry1; 1836 struct elf_m68k_can_merge_gots_arg *arg; 1837 const struct elf_m68k_got_entry *entry2; 1838 enum elf_m68k_reloc_type type; 1839 1840 entry1 = (const struct elf_m68k_got_entry *) *_entry_ptr; 1841 arg = (struct elf_m68k_can_merge_gots_arg *) _arg; 1842 1843 entry2 = elf_m68k_get_got_entry (arg->big, &entry1->key_, SEARCH, NULL); 1844 1845 if (entry2 != NULL) 1846 /* We found an existing entry. Check if we should update it. */ 1847 { 1848 type = elf_m68k_update_got_entry_type (arg->diff, 1849 entry2->key_.type, 1850 entry1->key_.type); 1851 1852 if (type == entry2->key_.type) 1853 /* ENTRY1 doesn't update data in ENTRY2. Skip it. 1854 To skip creation of difference entry we use the type, 1855 which we won't see in GOT entries for sure. */ 1856 type = R_68K_max; 1857 } 1858 else 1859 /* We didn't find the entry. Add entry1 to DIFF. */ 1860 { 1861 BFD_ASSERT (entry1->key_.type != R_68K_max); 1862 1863 type = elf_m68k_update_got_entry_type (arg->diff, 1864 R_68K_max, entry1->key_.type); 1865 1866 if (entry1->key_.bfd != NULL) 1867 arg->diff->local_n_slots += elf_m68k_reloc_got_n_slots (type); 1868 } 1869 1870 if (type != R_68K_max) 1871 /* Create an entry in DIFF. */ 1872 { 1873 struct elf_m68k_got_entry *entry; 1874 1875 entry = elf_m68k_get_got_entry (arg->diff, &entry1->key_, MUST_CREATE, 1876 arg->info); 1877 if (entry == NULL) 1878 { 1879 arg->error_p = TRUE; 1880 return 0; 1881 } 1882 1883 entry->key_.type = type; 1884 } 1885 1886 return 1; 1887} 1888 1889/* Return TRUE if SMALL GOT can be added to BIG GOT without overflowing it. 1890 Construct DIFF GOT holding the entries which should be added or updated 1891 in BIG GOT to accumulate information from SMALL. 1892 INFO is the context where memory should be allocated. */ 1893 1894static bfd_boolean 1895elf_m68k_can_merge_gots (struct elf_m68k_got *big, 1896 const struct elf_m68k_got *small, 1897 struct bfd_link_info *info, 1898 struct elf_m68k_got *diff) 1899{ 1900 struct elf_m68k_can_merge_gots_arg arg_; 1901 1902 BFD_ASSERT (small->offset == (bfd_vma) -1); 1903 1904 arg_.big = big; 1905 arg_.diff = diff; 1906 arg_.info = info; 1907 arg_.error_p = FALSE; 1908 htab_traverse_noresize (small->entries, elf_m68k_can_merge_gots_1, &arg_); 1909 if (arg_.error_p) 1910 { 1911 diff->offset = 0; 1912 return FALSE; 1913 } 1914 1915 /* Check for overflow. */ 1916 if ((big->n_slots[R_8] + arg_.diff->n_slots[R_8] 1917 > ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info)) 1918 || (big->n_slots[R_16] + arg_.diff->n_slots[R_16] 1919 > ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT (info))) 1920 return FALSE; 1921 1922 return TRUE; 1923} 1924 1925struct elf_m68k_merge_gots_arg 1926{ 1927 /* The BIG got. */ 1928 struct elf_m68k_got *big; 1929 1930 /* Context where memory should be allocated. */ 1931 struct bfd_link_info *info; 1932 1933 /* Error flag. */ 1934 bfd_boolean error_p; 1935}; 1936 1937/* Process a single entry from DIFF got. Add or update corresponding 1938 entry in the BIG got. */ 1939 1940static int 1941elf_m68k_merge_gots_1 (void **entry_ptr, void *_arg) 1942{ 1943 const struct elf_m68k_got_entry *from; 1944 struct elf_m68k_merge_gots_arg *arg; 1945 struct elf_m68k_got_entry *to; 1946 1947 from = (const struct elf_m68k_got_entry *) *entry_ptr; 1948 arg = (struct elf_m68k_merge_gots_arg *) _arg; 1949 1950 to = elf_m68k_get_got_entry (arg->big, &from->key_, FIND_OR_CREATE, 1951 arg->info); 1952 if (to == NULL) 1953 { 1954 arg->error_p = TRUE; 1955 return 0; 1956 } 1957 1958 BFD_ASSERT (to->u.s1.refcount == 0); 1959 /* All we need to merge is TYPE. */ 1960 to->key_.type = from->key_.type; 1961 1962 return 1; 1963} 1964 1965/* Merge data from DIFF to BIG. INFO is context where memory should be 1966 allocated. */ 1967 1968static bfd_boolean 1969elf_m68k_merge_gots (struct elf_m68k_got *big, 1970 struct elf_m68k_got *diff, 1971 struct bfd_link_info *info) 1972{ 1973 if (diff->entries != NULL) 1974 /* DIFF is not empty. Merge it into BIG GOT. */ 1975 { 1976 struct elf_m68k_merge_gots_arg arg_; 1977 1978 /* Merge entries. */ 1979 arg_.big = big; 1980 arg_.info = info; 1981 arg_.error_p = FALSE; 1982 htab_traverse_noresize (diff->entries, elf_m68k_merge_gots_1, &arg_); 1983 if (arg_.error_p) 1984 return FALSE; 1985 1986 /* Merge counters. */ 1987 big->n_slots[R_8] += diff->n_slots[R_8]; 1988 big->n_slots[R_16] += diff->n_slots[R_16]; 1989 big->n_slots[R_32] += diff->n_slots[R_32]; 1990 big->local_n_slots += diff->local_n_slots; 1991 } 1992 else 1993 /* DIFF is empty. */ 1994 { 1995 BFD_ASSERT (diff->n_slots[R_8] == 0); 1996 BFD_ASSERT (diff->n_slots[R_16] == 0); 1997 BFD_ASSERT (diff->n_slots[R_32] == 0); 1998 BFD_ASSERT (diff->local_n_slots == 0); 1999 } 2000 2001 BFD_ASSERT (!elf_m68k_hash_table (info)->allow_multigot_p 2002 || ((big->n_slots[R_8] 2003 <= ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info)) 2004 && (big->n_slots[R_16] 2005 <= ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT (info)))); 2006 2007 return TRUE; 2008} 2009 2010struct elf_m68k_finalize_got_offsets_arg 2011{ 2012 /* Ranges of the offsets for GOT entries. 2013 R_x entries receive offsets between offset1[R_x] and offset2[R_x]. 2014 R_x is R_8, R_16 and R_32. */ 2015 bfd_vma *offset1; 2016 bfd_vma *offset2; 2017 2018 /* Mapping from global symndx to global symbols. 2019 This is used to build lists of got entries for global symbols. */ 2020 struct elf_m68k_link_hash_entry **symndx2h; 2021 2022 bfd_vma n_ldm_entries; 2023}; 2024 2025/* Assign ENTRY an offset. Build list of GOT entries for global symbols 2026 along the way. */ 2027 2028static int 2029elf_m68k_finalize_got_offsets_1 (void **entry_ptr, void *_arg) 2030{ 2031 struct elf_m68k_got_entry *entry; 2032 struct elf_m68k_finalize_got_offsets_arg *arg; 2033 2034 enum elf_m68k_got_offset_size got_offset_size; 2035 bfd_vma entry_size; 2036 2037 entry = (struct elf_m68k_got_entry *) *entry_ptr; 2038 arg = (struct elf_m68k_finalize_got_offsets_arg *) _arg; 2039 2040 /* This should be a fresh entry created in elf_m68k_can_merge_gots. */ 2041 BFD_ASSERT (entry->u.s1.refcount == 0); 2042 2043 /* Get GOT offset size for the entry . */ 2044 got_offset_size = elf_m68k_reloc_got_offset_size (entry->key_.type); 2045 2046 /* Calculate entry size in bytes. */ 2047 entry_size = 4 * elf_m68k_reloc_got_n_slots (entry->key_.type); 2048 2049 /* Check if we should switch to negative range of the offsets. */ 2050 if (arg->offset1[got_offset_size] + entry_size 2051 > arg->offset2[got_offset_size]) 2052 { 2053 /* Verify that this is the only switch to negative range for 2054 got_offset_size. If this assertion fails, then we've miscalculated 2055 range for got_offset_size entries in 2056 elf_m68k_finalize_got_offsets. */ 2057 BFD_ASSERT (arg->offset2[got_offset_size] 2058 != arg->offset2[-(int) got_offset_size - 1]); 2059 2060 /* Switch. */ 2061 arg->offset1[got_offset_size] = arg->offset1[-(int) got_offset_size - 1]; 2062 arg->offset2[got_offset_size] = arg->offset2[-(int) got_offset_size - 1]; 2063 2064 /* Verify that now we have enough room for the entry. */ 2065 BFD_ASSERT (arg->offset1[got_offset_size] + entry_size 2066 <= arg->offset2[got_offset_size]); 2067 } 2068 2069 /* Assign offset to entry. */ 2070 entry->u.s2.offset = arg->offset1[got_offset_size]; 2071 arg->offset1[got_offset_size] += entry_size; 2072 2073 if (entry->key_.bfd == NULL) 2074 /* Hook up this entry into the list of got_entries of H. */ 2075 { 2076 struct elf_m68k_link_hash_entry *h; 2077 2078 h = arg->symndx2h[entry->key_.symndx]; 2079 if (h != NULL) 2080 { 2081 entry->u.s2.next = h->glist; 2082 h->glist = entry; 2083 } 2084 else 2085 /* This should be the entry for TLS_LDM relocation then. */ 2086 { 2087 BFD_ASSERT ((elf_m68k_reloc_got_type (entry->key_.type) 2088 == R_68K_TLS_LDM32) 2089 && entry->key_.symndx == 0); 2090 2091 ++arg->n_ldm_entries; 2092 } 2093 } 2094 else 2095 /* This entry is for local symbol. */ 2096 entry->u.s2.next = NULL; 2097 2098 return 1; 2099} 2100 2101/* Assign offsets within GOT. USE_NEG_GOT_OFFSETS_P indicates if we 2102 should use negative offsets. 2103 Build list of GOT entries for global symbols along the way. 2104 SYMNDX2H is mapping from global symbol indices to actual 2105 global symbols. 2106 Return offset at which next GOT should start. */ 2107 2108static void 2109elf_m68k_finalize_got_offsets (struct elf_m68k_got *got, 2110 bfd_boolean use_neg_got_offsets_p, 2111 struct elf_m68k_link_hash_entry **symndx2h, 2112 bfd_vma *final_offset, bfd_vma *n_ldm_entries) 2113{ 2114 struct elf_m68k_finalize_got_offsets_arg arg_; 2115 bfd_vma offset1_[2 * R_LAST]; 2116 bfd_vma offset2_[2 * R_LAST]; 2117 int i; 2118 bfd_vma start_offset; 2119 2120 BFD_ASSERT (got->offset != (bfd_vma) -1); 2121 2122 /* We set entry offsets relative to the .got section (and not the 2123 start of a particular GOT), so that we can use them in 2124 finish_dynamic_symbol without needing to know the GOT which they come 2125 from. */ 2126 2127 /* Put offset1 in the middle of offset1_, same for offset2. */ 2128 arg_.offset1 = offset1_ + R_LAST; 2129 arg_.offset2 = offset2_ + R_LAST; 2130 2131 start_offset = got->offset; 2132 2133 if (use_neg_got_offsets_p) 2134 /* Setup both negative and positive ranges for R_8, R_16 and R_32. */ 2135 i = -(int) R_32 - 1; 2136 else 2137 /* Setup positives ranges for R_8, R_16 and R_32. */ 2138 i = (int) R_8; 2139 2140 for (; i <= (int) R_32; ++i) 2141 { 2142 int j; 2143 size_t n; 2144 2145 /* Set beginning of the range of offsets I. */ 2146 arg_.offset1[i] = start_offset; 2147 2148 /* Calculate number of slots that require I offsets. */ 2149 j = (i >= 0) ? i : -i - 1; 2150 n = (j >= 1) ? got->n_slots[j - 1] : 0; 2151 n = got->n_slots[j] - n; 2152 2153 if (use_neg_got_offsets_p && n != 0) 2154 { 2155 if (i < 0) 2156 /* We first fill the positive side of the range, so we might 2157 end up with one empty slot at that side when we can't fit 2158 whole 2-slot entry. Account for that at negative side of 2159 the interval with one additional entry. */ 2160 n = n / 2 + 1; 2161 else 2162 /* When the number of slots is odd, make positive side of the 2163 range one entry bigger. */ 2164 n = (n + 1) / 2; 2165 } 2166 2167 /* N is the number of slots that require I offsets. 2168 Calculate length of the range for I offsets. */ 2169 n = 4 * n; 2170 2171 /* Set end of the range. */ 2172 arg_.offset2[i] = start_offset + n; 2173 2174 start_offset = arg_.offset2[i]; 2175 } 2176 2177 if (!use_neg_got_offsets_p) 2178 /* Make sure that if we try to switch to negative offsets in 2179 elf_m68k_finalize_got_offsets_1, the assert therein will catch 2180 the bug. */ 2181 for (i = R_8; i <= R_32; ++i) 2182 arg_.offset2[-i - 1] = arg_.offset2[i]; 2183 2184 /* Setup got->offset. offset1[R_8] is either in the middle or at the 2185 beginning of GOT depending on use_neg_got_offsets_p. */ 2186 got->offset = arg_.offset1[R_8]; 2187 2188 arg_.symndx2h = symndx2h; 2189 arg_.n_ldm_entries = 0; 2190 2191 /* Assign offsets. */ 2192 htab_traverse (got->entries, elf_m68k_finalize_got_offsets_1, &arg_); 2193 2194 /* Check offset ranges we have actually assigned. */ 2195 for (i = (int) R_8; i <= (int) R_32; ++i) 2196 BFD_ASSERT (arg_.offset2[i] - arg_.offset1[i] <= 4); 2197 2198 *final_offset = start_offset; 2199 *n_ldm_entries = arg_.n_ldm_entries; 2200} 2201 2202struct elf_m68k_partition_multi_got_arg 2203{ 2204 /* The GOT we are adding entries to. Aka big got. */ 2205 struct elf_m68k_got *current_got; 2206 2207 /* Offset to assign the next CURRENT_GOT. */ 2208 bfd_vma offset; 2209 2210 /* Context where memory should be allocated. */ 2211 struct bfd_link_info *info; 2212 2213 /* Total number of slots in the .got section. 2214 This is used to calculate size of the .got and .rela.got sections. */ 2215 bfd_vma n_slots; 2216 2217 /* Difference in numbers of allocated slots in the .got section 2218 and necessary relocations in the .rela.got section. 2219 This is used to calculate size of the .rela.got section. */ 2220 bfd_vma slots_relas_diff; 2221 2222 /* Error flag. */ 2223 bfd_boolean error_p; 2224 2225 /* Mapping from global symndx to global symbols. 2226 This is used to build lists of got entries for global symbols. */ 2227 struct elf_m68k_link_hash_entry **symndx2h; 2228}; 2229 2230static void 2231elf_m68k_partition_multi_got_2 (struct elf_m68k_partition_multi_got_arg *arg) 2232{ 2233 bfd_vma n_ldm_entries; 2234 2235 elf_m68k_finalize_got_offsets (arg->current_got, 2236 (elf_m68k_hash_table (arg->info) 2237 ->use_neg_got_offsets_p), 2238 arg->symndx2h, 2239 &arg->offset, &n_ldm_entries); 2240 2241 arg->n_slots += arg->current_got->n_slots[R_32]; 2242 2243 if (!bfd_link_pic (arg->info)) 2244 /* If we are generating a shared object, we need to 2245 output a R_68K_RELATIVE reloc so that the dynamic 2246 linker can adjust this GOT entry. Overwise we 2247 don't need space in .rela.got for local symbols. */ 2248 arg->slots_relas_diff += arg->current_got->local_n_slots; 2249 2250 /* @LDM relocations require a 2-slot GOT entry, but only 2251 one relocation. Account for that. */ 2252 arg->slots_relas_diff += n_ldm_entries; 2253 2254 BFD_ASSERT (arg->slots_relas_diff <= arg->n_slots); 2255} 2256 2257 2258/* Process a single BFD2GOT entry and either merge GOT to CURRENT_GOT 2259 or start a new CURRENT_GOT. */ 2260 2261static int 2262elf_m68k_partition_multi_got_1 (void **_entry, void *_arg) 2263{ 2264 struct elf_m68k_bfd2got_entry *entry; 2265 struct elf_m68k_partition_multi_got_arg *arg; 2266 struct elf_m68k_got *got; 2267 struct elf_m68k_got diff_; 2268 struct elf_m68k_got *diff; 2269 2270 entry = (struct elf_m68k_bfd2got_entry *) *_entry; 2271 arg = (struct elf_m68k_partition_multi_got_arg *) _arg; 2272 2273 got = entry->got; 2274 BFD_ASSERT (got != NULL); 2275 BFD_ASSERT (got->offset == (bfd_vma) -1); 2276 2277 diff = NULL; 2278 2279 if (arg->current_got != NULL) 2280 /* Construct diff. */ 2281 { 2282 diff = &diff_; 2283 elf_m68k_init_got (diff); 2284 2285 if (!elf_m68k_can_merge_gots (arg->current_got, got, arg->info, diff)) 2286 { 2287 if (diff->offset == 0) 2288 /* Offset set to 0 in the diff_ indicates an error. */ 2289 { 2290 arg->error_p = TRUE; 2291 goto final_return; 2292 } 2293 2294 if (elf_m68k_hash_table (arg->info)->allow_multigot_p) 2295 { 2296 elf_m68k_clear_got (diff); 2297 /* Schedule to finish up current_got and start new one. */ 2298 diff = NULL; 2299 } 2300 /* else 2301 Merge GOTs no matter what. If big GOT overflows, 2302 we'll fail in relocate_section due to truncated relocations. 2303 2304 ??? May be fail earlier? E.g., in can_merge_gots. */ 2305 } 2306 } 2307 else 2308 /* Diff of got against empty current_got is got itself. */ 2309 { 2310 /* Create empty current_got to put subsequent GOTs to. */ 2311 arg->current_got = elf_m68k_create_empty_got (arg->info); 2312 if (arg->current_got == NULL) 2313 { 2314 arg->error_p = TRUE; 2315 goto final_return; 2316 } 2317 2318 arg->current_got->offset = arg->offset; 2319 2320 diff = got; 2321 } 2322 2323 if (diff != NULL) 2324 { 2325 if (!elf_m68k_merge_gots (arg->current_got, diff, arg->info)) 2326 { 2327 arg->error_p = TRUE; 2328 goto final_return; 2329 } 2330 2331 /* Now we can free GOT. */ 2332 elf_m68k_clear_got (got); 2333 2334 entry->got = arg->current_got; 2335 } 2336 else 2337 { 2338 /* Finish up current_got. */ 2339 elf_m68k_partition_multi_got_2 (arg); 2340 2341 /* Schedule to start a new current_got. */ 2342 arg->current_got = NULL; 2343 2344 /* Retry. */ 2345 if (!elf_m68k_partition_multi_got_1 (_entry, _arg)) 2346 { 2347 BFD_ASSERT (arg->error_p); 2348 goto final_return; 2349 } 2350 } 2351 2352 final_return: 2353 if (diff != NULL) 2354 elf_m68k_clear_got (diff); 2355 2356 return arg->error_p == FALSE ? 1 : 0; 2357} 2358 2359/* Helper function to build symndx2h mapping. */ 2360 2361static bfd_boolean 2362elf_m68k_init_symndx2h_1 (struct elf_link_hash_entry *_h, 2363 void *_arg) 2364{ 2365 struct elf_m68k_link_hash_entry *h; 2366 2367 h = elf_m68k_hash_entry (_h); 2368 2369 if (h->got_entry_key != 0) 2370 /* H has at least one entry in the GOT. */ 2371 { 2372 struct elf_m68k_partition_multi_got_arg *arg; 2373 2374 arg = (struct elf_m68k_partition_multi_got_arg *) _arg; 2375 2376 BFD_ASSERT (arg->symndx2h[h->got_entry_key] == NULL); 2377 arg->symndx2h[h->got_entry_key] = h; 2378 } 2379 2380 return TRUE; 2381} 2382 2383/* Merge GOTs of some BFDs, assign offsets to GOT entries and build 2384 lists of GOT entries for global symbols. 2385 Calculate sizes of .got and .rela.got sections. */ 2386 2387static bfd_boolean 2388elf_m68k_partition_multi_got (struct bfd_link_info *info) 2389{ 2390 struct elf_m68k_multi_got *multi_got; 2391 struct elf_m68k_partition_multi_got_arg arg_; 2392 2393 multi_got = elf_m68k_multi_got (info); 2394 2395 arg_.current_got = NULL; 2396 arg_.offset = 0; 2397 arg_.info = info; 2398 arg_.n_slots = 0; 2399 arg_.slots_relas_diff = 0; 2400 arg_.error_p = FALSE; 2401 2402 if (multi_got->bfd2got != NULL) 2403 { 2404 /* Initialize symndx2h mapping. */ 2405 { 2406 arg_.symndx2h = bfd_zmalloc (multi_got->global_symndx 2407 * sizeof (*arg_.symndx2h)); 2408 if (arg_.symndx2h == NULL) 2409 return FALSE; 2410 2411 elf_link_hash_traverse (elf_hash_table (info), 2412 elf_m68k_init_symndx2h_1, &arg_); 2413 } 2414 2415 /* Partition. */ 2416 htab_traverse (multi_got->bfd2got, elf_m68k_partition_multi_got_1, 2417 &arg_); 2418 if (arg_.error_p) 2419 { 2420 free (arg_.symndx2h); 2421 arg_.symndx2h = NULL; 2422 2423 return FALSE; 2424 } 2425 2426 /* Finish up last current_got. */ 2427 elf_m68k_partition_multi_got_2 (&arg_); 2428 2429 free (arg_.symndx2h); 2430 } 2431 2432 if (elf_hash_table (info)->dynobj != NULL) 2433 /* Set sizes of .got and .rela.got sections. */ 2434 { 2435 asection *s; 2436 2437 s = elf_hash_table (info)->sgot; 2438 if (s != NULL) 2439 s->size = arg_.offset; 2440 else 2441 BFD_ASSERT (arg_.offset == 0); 2442 2443 BFD_ASSERT (arg_.slots_relas_diff <= arg_.n_slots); 2444 arg_.n_slots -= arg_.slots_relas_diff; 2445 2446 s = elf_hash_table (info)->srelgot; 2447 if (s != NULL) 2448 s->size = arg_.n_slots * sizeof (Elf32_External_Rela); 2449 else 2450 BFD_ASSERT (arg_.n_slots == 0); 2451 } 2452 else 2453 BFD_ASSERT (multi_got->bfd2got == NULL); 2454 2455 return TRUE; 2456} 2457 2458/* Specialized version of elf_m68k_get_got_entry that returns pointer 2459 to hashtable slot, thus allowing removal of entry via 2460 elf_m68k_remove_got_entry. */ 2461 2462static struct elf_m68k_got_entry ** 2463elf_m68k_find_got_entry_ptr (struct elf_m68k_got *got, 2464 struct elf_m68k_got_entry_key *key) 2465{ 2466 void **ptr; 2467 struct elf_m68k_got_entry entry_; 2468 struct elf_m68k_got_entry **entry_ptr; 2469 2470 entry_.key_ = *key; 2471 ptr = htab_find_slot (got->entries, &entry_, NO_INSERT); 2472 BFD_ASSERT (ptr != NULL); 2473 2474 entry_ptr = (struct elf_m68k_got_entry **) ptr; 2475 2476 return entry_ptr; 2477} 2478 2479/* Remove entry pointed to by ENTRY_PTR from GOT. */ 2480 2481static void 2482elf_m68k_remove_got_entry (struct elf_m68k_got *got, 2483 struct elf_m68k_got_entry **entry_ptr) 2484{ 2485 struct elf_m68k_got_entry *entry; 2486 2487 entry = *entry_ptr; 2488 2489 /* Check that offsets have not been finalized yet. */ 2490 BFD_ASSERT (got->offset == (bfd_vma) -1); 2491 /* Check that this entry is indeed unused. */ 2492 BFD_ASSERT (entry->u.s1.refcount == 0); 2493 2494 elf_m68k_remove_got_entry_type (got, entry->key_.type); 2495 2496 if (entry->key_.bfd != NULL) 2497 got->local_n_slots -= elf_m68k_reloc_got_n_slots (entry->key_.type); 2498 2499 BFD_ASSERT (got->n_slots[R_32] >= got->local_n_slots); 2500 2501 htab_clear_slot (got->entries, (void **) entry_ptr); 2502} 2503 2504/* Copy any information related to dynamic linking from a pre-existing 2505 symbol to a newly created symbol. Also called to copy flags and 2506 other back-end info to a weakdef, in which case the symbol is not 2507 newly created and plt/got refcounts and dynamic indices should not 2508 be copied. */ 2509 2510static void 2511elf_m68k_copy_indirect_symbol (struct bfd_link_info *info, 2512 struct elf_link_hash_entry *_dir, 2513 struct elf_link_hash_entry *_ind) 2514{ 2515 struct elf_m68k_link_hash_entry *dir; 2516 struct elf_m68k_link_hash_entry *ind; 2517 2518 _bfd_elf_link_hash_copy_indirect (info, _dir, _ind); 2519 2520 if (_ind->root.type != bfd_link_hash_indirect) 2521 return; 2522 2523 dir = elf_m68k_hash_entry (_dir); 2524 ind = elf_m68k_hash_entry (_ind); 2525 2526 /* Any absolute non-dynamic relocations against an indirect or weak 2527 definition will be against the target symbol. */ 2528 _dir->non_got_ref |= _ind->non_got_ref; 2529 2530 /* We might have a direct symbol already having entries in the GOTs. 2531 Update its key only in case indirect symbol has GOT entries and 2532 assert that both indirect and direct symbols don't have GOT entries 2533 at the same time. */ 2534 if (ind->got_entry_key != 0) 2535 { 2536 BFD_ASSERT (dir->got_entry_key == 0); 2537 /* Assert that GOTs aren't partioned yet. */ 2538 BFD_ASSERT (ind->glist == NULL); 2539 2540 dir->got_entry_key = ind->got_entry_key; 2541 ind->got_entry_key = 0; 2542 } 2543} 2544 2545/* Look through the relocs for a section during the first phase, and 2546 allocate space in the global offset table or procedure linkage 2547 table. */ 2548 2549static bfd_boolean 2550elf_m68k_check_relocs (bfd *abfd, 2551 struct bfd_link_info *info, 2552 asection *sec, 2553 const Elf_Internal_Rela *relocs) 2554{ 2555 bfd *dynobj; 2556 Elf_Internal_Shdr *symtab_hdr; 2557 struct elf_link_hash_entry **sym_hashes; 2558 const Elf_Internal_Rela *rel; 2559 const Elf_Internal_Rela *rel_end; 2560 asection *sreloc; 2561 struct elf_m68k_got *got; 2562 2563 if (bfd_link_relocatable (info)) 2564 return TRUE; 2565 2566 dynobj = elf_hash_table (info)->dynobj; 2567 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 2568 sym_hashes = elf_sym_hashes (abfd); 2569 2570 sreloc = NULL; 2571 2572 got = NULL; 2573 2574 rel_end = relocs + sec->reloc_count; 2575 for (rel = relocs; rel < rel_end; rel++) 2576 { 2577 unsigned long r_symndx; 2578 struct elf_link_hash_entry *h; 2579 2580 r_symndx = ELF32_R_SYM (rel->r_info); 2581 2582 if (r_symndx < symtab_hdr->sh_info) 2583 h = NULL; 2584 else 2585 { 2586 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 2587 while (h->root.type == bfd_link_hash_indirect 2588 || h->root.type == bfd_link_hash_warning) 2589 h = (struct elf_link_hash_entry *) h->root.u.i.link; 2590 2591 /* PR15323, ref flags aren't set for references in the same 2592 object. */ 2593 h->root.non_ir_ref = 1; 2594 } 2595 2596 switch (ELF32_R_TYPE (rel->r_info)) 2597 { 2598 case R_68K_GOT8: 2599 case R_68K_GOT16: 2600 case R_68K_GOT32: 2601 if (h != NULL 2602 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) 2603 break; 2604 /* Fall through. */ 2605 2606 /* Relative GOT relocations. */ 2607 case R_68K_GOT8O: 2608 case R_68K_GOT16O: 2609 case R_68K_GOT32O: 2610 /* Fall through. */ 2611 2612 /* TLS relocations. */ 2613 case R_68K_TLS_GD8: 2614 case R_68K_TLS_GD16: 2615 case R_68K_TLS_GD32: 2616 case R_68K_TLS_LDM8: 2617 case R_68K_TLS_LDM16: 2618 case R_68K_TLS_LDM32: 2619 case R_68K_TLS_IE8: 2620 case R_68K_TLS_IE16: 2621 case R_68K_TLS_IE32: 2622 2623 case R_68K_TLS_TPREL32: 2624 case R_68K_TLS_DTPREL32: 2625 2626 if (ELF32_R_TYPE (rel->r_info) == R_68K_TLS_TPREL32 2627 && bfd_link_pic (info)) 2628 /* Do the special chorus for libraries with static TLS. */ 2629 info->flags |= DF_STATIC_TLS; 2630 2631 /* This symbol requires a global offset table entry. */ 2632 2633 if (dynobj == NULL) 2634 { 2635 /* Create the .got section. */ 2636 elf_hash_table (info)->dynobj = dynobj = abfd; 2637 if (!_bfd_elf_create_got_section (dynobj, info)) 2638 return FALSE; 2639 } 2640 2641 if (got == NULL) 2642 { 2643 struct elf_m68k_bfd2got_entry *bfd2got_entry; 2644 2645 bfd2got_entry 2646 = elf_m68k_get_bfd2got_entry (elf_m68k_multi_got (info), 2647 abfd, FIND_OR_CREATE, info); 2648 if (bfd2got_entry == NULL) 2649 return FALSE; 2650 2651 got = bfd2got_entry->got; 2652 BFD_ASSERT (got != NULL); 2653 } 2654 2655 { 2656 struct elf_m68k_got_entry *got_entry; 2657 2658 /* Add entry to got. */ 2659 got_entry = elf_m68k_add_entry_to_got (got, h, abfd, 2660 ELF32_R_TYPE (rel->r_info), 2661 r_symndx, info); 2662 if (got_entry == NULL) 2663 return FALSE; 2664 2665 if (got_entry->u.s1.refcount == 1) 2666 { 2667 /* Make sure this symbol is output as a dynamic symbol. */ 2668 if (h != NULL 2669 && h->dynindx == -1 2670 && !h->forced_local) 2671 { 2672 if (!bfd_elf_link_record_dynamic_symbol (info, h)) 2673 return FALSE; 2674 } 2675 } 2676 } 2677 2678 break; 2679 2680 case R_68K_PLT8: 2681 case R_68K_PLT16: 2682 case R_68K_PLT32: 2683 /* This symbol requires a procedure linkage table entry. We 2684 actually build the entry in adjust_dynamic_symbol, 2685 because this might be a case of linking PIC code which is 2686 never referenced by a dynamic object, in which case we 2687 don't need to generate a procedure linkage table entry 2688 after all. */ 2689 2690 /* If this is a local symbol, we resolve it directly without 2691 creating a procedure linkage table entry. */ 2692 if (h == NULL) 2693 continue; 2694 2695 h->needs_plt = 1; 2696 h->plt.refcount++; 2697 break; 2698 2699 case R_68K_PLT8O: 2700 case R_68K_PLT16O: 2701 case R_68K_PLT32O: 2702 /* This symbol requires a procedure linkage table entry. */ 2703 2704 if (h == NULL) 2705 { 2706 /* It does not make sense to have this relocation for a 2707 local symbol. FIXME: does it? How to handle it if 2708 it does make sense? */ 2709 bfd_set_error (bfd_error_bad_value); 2710 return FALSE; 2711 } 2712 2713 /* Make sure this symbol is output as a dynamic symbol. */ 2714 if (h->dynindx == -1 2715 && !h->forced_local) 2716 { 2717 if (!bfd_elf_link_record_dynamic_symbol (info, h)) 2718 return FALSE; 2719 } 2720 2721 h->needs_plt = 1; 2722 h->plt.refcount++; 2723 break; 2724 2725 case R_68K_PC8: 2726 case R_68K_PC16: 2727 case R_68K_PC32: 2728 /* If we are creating a shared library and this is not a local 2729 symbol, we need to copy the reloc into the shared library. 2730 However when linking with -Bsymbolic and this is a global 2731 symbol which is defined in an object we are including in the 2732 link (i.e., DEF_REGULAR is set), then we can resolve the 2733 reloc directly. At this point we have not seen all the input 2734 files, so it is possible that DEF_REGULAR is not set now but 2735 will be set later (it is never cleared). We account for that 2736 possibility below by storing information in the 2737 pcrel_relocs_copied field of the hash table entry. */ 2738 if (!(bfd_link_pic (info) 2739 && (sec->flags & SEC_ALLOC) != 0 2740 && h != NULL 2741 && (!SYMBOLIC_BIND (info, h) 2742 || h->root.type == bfd_link_hash_defweak 2743 || !h->def_regular))) 2744 { 2745 if (h != NULL) 2746 { 2747 /* Make sure a plt entry is created for this symbol if 2748 it turns out to be a function defined by a dynamic 2749 object. */ 2750 h->plt.refcount++; 2751 } 2752 break; 2753 } 2754 /* Fall through. */ 2755 case R_68K_8: 2756 case R_68K_16: 2757 case R_68K_32: 2758 /* We don't need to handle relocs into sections not going into 2759 the "real" output. */ 2760 if ((sec->flags & SEC_ALLOC) == 0) 2761 break; 2762 2763 if (h != NULL) 2764 { 2765 /* Make sure a plt entry is created for this symbol if it 2766 turns out to be a function defined by a dynamic object. */ 2767 h->plt.refcount++; 2768 2769 if (bfd_link_executable (info)) 2770 /* This symbol needs a non-GOT reference. */ 2771 h->non_got_ref = 1; 2772 } 2773 2774 /* If we are creating a shared library, we need to copy the 2775 reloc into the shared library. */ 2776 if (bfd_link_pic (info)) 2777 { 2778 /* When creating a shared object, we must copy these 2779 reloc types into the output file. We create a reloc 2780 section in dynobj and make room for this reloc. */ 2781 if (sreloc == NULL) 2782 { 2783 sreloc = _bfd_elf_make_dynamic_reloc_section 2784 (sec, dynobj, 2, abfd, /*rela?*/ TRUE); 2785 2786 if (sreloc == NULL) 2787 return FALSE; 2788 } 2789 2790 if (sec->flags & SEC_READONLY 2791 /* Don't set DF_TEXTREL yet for PC relative 2792 relocations, they might be discarded later. */ 2793 && !(ELF32_R_TYPE (rel->r_info) == R_68K_PC8 2794 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16 2795 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32)) 2796 info->flags |= DF_TEXTREL; 2797 2798 sreloc->size += sizeof (Elf32_External_Rela); 2799 2800 /* We count the number of PC relative relocations we have 2801 entered for this symbol, so that we can discard them 2802 again if, in the -Bsymbolic case, the symbol is later 2803 defined by a regular object, or, in the normal shared 2804 case, the symbol is forced to be local. Note that this 2805 function is only called if we are using an m68kelf linker 2806 hash table, which means that h is really a pointer to an 2807 elf_m68k_link_hash_entry. */ 2808 if (ELF32_R_TYPE (rel->r_info) == R_68K_PC8 2809 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16 2810 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32) 2811 { 2812 struct elf_m68k_pcrel_relocs_copied *p; 2813 struct elf_m68k_pcrel_relocs_copied **head; 2814 2815 if (h != NULL) 2816 { 2817 struct elf_m68k_link_hash_entry *eh 2818 = elf_m68k_hash_entry (h); 2819 head = &eh->pcrel_relocs_copied; 2820 } 2821 else 2822 { 2823 asection *s; 2824 void *vpp; 2825 Elf_Internal_Sym *isym; 2826 2827 isym = bfd_sym_from_r_symndx (&elf_m68k_hash_table (info)->sym_cache, 2828 abfd, r_symndx); 2829 if (isym == NULL) 2830 return FALSE; 2831 2832 s = bfd_section_from_elf_index (abfd, isym->st_shndx); 2833 if (s == NULL) 2834 s = sec; 2835 2836 vpp = &elf_section_data (s)->local_dynrel; 2837 head = (struct elf_m68k_pcrel_relocs_copied **) vpp; 2838 } 2839 2840 for (p = *head; p != NULL; p = p->next) 2841 if (p->section == sreloc) 2842 break; 2843 2844 if (p == NULL) 2845 { 2846 p = ((struct elf_m68k_pcrel_relocs_copied *) 2847 bfd_alloc (dynobj, (bfd_size_type) sizeof *p)); 2848 if (p == NULL) 2849 return FALSE; 2850 p->next = *head; 2851 *head = p; 2852 p->section = sreloc; 2853 p->count = 0; 2854 } 2855 2856 ++p->count; 2857 } 2858 } 2859 2860 break; 2861 2862 /* This relocation describes the C++ object vtable hierarchy. 2863 Reconstruct it for later use during GC. */ 2864 case R_68K_GNU_VTINHERIT: 2865 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 2866 return FALSE; 2867 break; 2868 2869 /* This relocation describes which C++ vtable entries are actually 2870 used. Record for later use during GC. */ 2871 case R_68K_GNU_VTENTRY: 2872 BFD_ASSERT (h != NULL); 2873 if (h != NULL 2874 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 2875 return FALSE; 2876 break; 2877 2878 default: 2879 break; 2880 } 2881 } 2882 2883 return TRUE; 2884} 2885 2886/* Return the section that should be marked against GC for a given 2887 relocation. */ 2888 2889static asection * 2890elf_m68k_gc_mark_hook (asection *sec, 2891 struct bfd_link_info *info, 2892 Elf_Internal_Rela *rel, 2893 struct elf_link_hash_entry *h, 2894 Elf_Internal_Sym *sym) 2895{ 2896 if (h != NULL) 2897 switch (ELF32_R_TYPE (rel->r_info)) 2898 { 2899 case R_68K_GNU_VTINHERIT: 2900 case R_68K_GNU_VTENTRY: 2901 return NULL; 2902 } 2903 2904 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 2905} 2906 2907/* Update the got entry reference counts for the section being removed. */ 2908 2909static bfd_boolean 2910elf_m68k_gc_sweep_hook (bfd *abfd, 2911 struct bfd_link_info *info, 2912 asection *sec, 2913 const Elf_Internal_Rela *relocs) 2914{ 2915 Elf_Internal_Shdr *symtab_hdr; 2916 struct elf_link_hash_entry **sym_hashes; 2917 const Elf_Internal_Rela *rel, *relend; 2918 bfd *dynobj; 2919 struct elf_m68k_got *got; 2920 2921 if (bfd_link_relocatable (info)) 2922 return TRUE; 2923 2924 dynobj = elf_hash_table (info)->dynobj; 2925 if (dynobj == NULL) 2926 return TRUE; 2927 2928 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 2929 sym_hashes = elf_sym_hashes (abfd); 2930 got = NULL; 2931 2932 relend = relocs + sec->reloc_count; 2933 for (rel = relocs; rel < relend; rel++) 2934 { 2935 unsigned long r_symndx; 2936 struct elf_link_hash_entry *h = NULL; 2937 2938 r_symndx = ELF32_R_SYM (rel->r_info); 2939 if (r_symndx >= symtab_hdr->sh_info) 2940 { 2941 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 2942 while (h->root.type == bfd_link_hash_indirect 2943 || h->root.type == bfd_link_hash_warning) 2944 h = (struct elf_link_hash_entry *) h->root.u.i.link; 2945 } 2946 2947 switch (ELF32_R_TYPE (rel->r_info)) 2948 { 2949 case R_68K_GOT8: 2950 case R_68K_GOT16: 2951 case R_68K_GOT32: 2952 if (h != NULL 2953 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) 2954 break; 2955 2956 /* FALLTHRU */ 2957 case R_68K_GOT8O: 2958 case R_68K_GOT16O: 2959 case R_68K_GOT32O: 2960 /* Fall through. */ 2961 2962 /* TLS relocations. */ 2963 case R_68K_TLS_GD8: 2964 case R_68K_TLS_GD16: 2965 case R_68K_TLS_GD32: 2966 case R_68K_TLS_LDM8: 2967 case R_68K_TLS_LDM16: 2968 case R_68K_TLS_LDM32: 2969 case R_68K_TLS_IE8: 2970 case R_68K_TLS_IE16: 2971 case R_68K_TLS_IE32: 2972 2973 case R_68K_TLS_TPREL32: 2974 case R_68K_TLS_DTPREL32: 2975 2976 if (got == NULL) 2977 { 2978 got = elf_m68k_get_bfd2got_entry (elf_m68k_multi_got (info), 2979 abfd, MUST_FIND, NULL)->got; 2980 BFD_ASSERT (got != NULL); 2981 } 2982 2983 { 2984 struct elf_m68k_got_entry_key key_; 2985 struct elf_m68k_got_entry **got_entry_ptr; 2986 struct elf_m68k_got_entry *got_entry; 2987 2988 elf_m68k_init_got_entry_key (&key_, h, abfd, r_symndx, 2989 ELF32_R_TYPE (rel->r_info)); 2990 got_entry_ptr = elf_m68k_find_got_entry_ptr (got, &key_); 2991 2992 got_entry = *got_entry_ptr; 2993 2994 if (got_entry->u.s1.refcount > 0) 2995 { 2996 --got_entry->u.s1.refcount; 2997 2998 if (got_entry->u.s1.refcount == 0) 2999 /* We don't need the .got entry any more. */ 3000 elf_m68k_remove_got_entry (got, got_entry_ptr); 3001 } 3002 } 3003 break; 3004 3005 case R_68K_PLT8: 3006 case R_68K_PLT16: 3007 case R_68K_PLT32: 3008 case R_68K_PLT8O: 3009 case R_68K_PLT16O: 3010 case R_68K_PLT32O: 3011 case R_68K_PC8: 3012 case R_68K_PC16: 3013 case R_68K_PC32: 3014 case R_68K_8: 3015 case R_68K_16: 3016 case R_68K_32: 3017 if (h != NULL) 3018 { 3019 if (h->plt.refcount > 0) 3020 --h->plt.refcount; 3021 } 3022 break; 3023 3024 default: 3025 break; 3026 } 3027 } 3028 3029 return TRUE; 3030} 3031 3032/* Return the type of PLT associated with OUTPUT_BFD. */ 3033 3034static const struct elf_m68k_plt_info * 3035elf_m68k_get_plt_info (bfd *output_bfd) 3036{ 3037 unsigned int features; 3038 3039 features = bfd_m68k_mach_to_features (bfd_get_mach (output_bfd)); 3040 if (features & cpu32) 3041 return &elf_cpu32_plt_info; 3042 if (features & mcfisa_b) 3043 return &elf_isab_plt_info; 3044 if (features & mcfisa_c) 3045 return &elf_isac_plt_info; 3046 return &elf_m68k_plt_info; 3047} 3048 3049/* This function is called after all the input files have been read, 3050 and the input sections have been assigned to output sections. 3051 It's a convenient place to determine the PLT style. */ 3052 3053static bfd_boolean 3054elf_m68k_always_size_sections (bfd *output_bfd, struct bfd_link_info *info) 3055{ 3056 /* Bind input BFDs to GOTs and calculate sizes of .got and .rela.got 3057 sections. */ 3058 if (!elf_m68k_partition_multi_got (info)) 3059 return FALSE; 3060 3061 elf_m68k_hash_table (info)->plt_info = elf_m68k_get_plt_info (output_bfd); 3062 return TRUE; 3063} 3064 3065/* Adjust a symbol defined by a dynamic object and referenced by a 3066 regular object. The current definition is in some section of the 3067 dynamic object, but we're not including those sections. We have to 3068 change the definition to something the rest of the link can 3069 understand. */ 3070 3071static bfd_boolean 3072elf_m68k_adjust_dynamic_symbol (struct bfd_link_info *info, 3073 struct elf_link_hash_entry *h) 3074{ 3075 struct elf_m68k_link_hash_table *htab; 3076 bfd *dynobj; 3077 asection *s; 3078 3079 htab = elf_m68k_hash_table (info); 3080 dynobj = htab->root.dynobj; 3081 3082 /* Make sure we know what is going on here. */ 3083 BFD_ASSERT (dynobj != NULL 3084 && (h->needs_plt 3085 || h->u.weakdef != NULL 3086 || (h->def_dynamic 3087 && h->ref_regular 3088 && !h->def_regular))); 3089 3090 /* If this is a function, put it in the procedure linkage table. We 3091 will fill in the contents of the procedure linkage table later, 3092 when we know the address of the .got section. */ 3093 if (h->type == STT_FUNC 3094 || h->needs_plt) 3095 { 3096 if ((h->plt.refcount <= 0 3097 || SYMBOL_CALLS_LOCAL (info, h) 3098 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 3099 && h->root.type == bfd_link_hash_undefweak)) 3100 /* We must always create the plt entry if it was referenced 3101 by a PLTxxO relocation. In this case we already recorded 3102 it as a dynamic symbol. */ 3103 && h->dynindx == -1) 3104 { 3105 /* This case can occur if we saw a PLTxx reloc in an input 3106 file, but the symbol was never referred to by a dynamic 3107 object, or if all references were garbage collected. In 3108 such a case, we don't actually need to build a procedure 3109 linkage table, and we can just do a PCxx reloc instead. */ 3110 h->plt.offset = (bfd_vma) -1; 3111 h->needs_plt = 0; 3112 return TRUE; 3113 } 3114 3115 /* Make sure this symbol is output as a dynamic symbol. */ 3116 if (h->dynindx == -1 3117 && !h->forced_local) 3118 { 3119 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 3120 return FALSE; 3121 } 3122 3123 s = htab->root.splt; 3124 BFD_ASSERT (s != NULL); 3125 3126 /* If this is the first .plt entry, make room for the special 3127 first entry. */ 3128 if (s->size == 0) 3129 s->size = htab->plt_info->size; 3130 3131 /* If this symbol is not defined in a regular file, and we are 3132 not generating a shared library, then set the symbol to this 3133 location in the .plt. This is required to make function 3134 pointers compare as equal between the normal executable and 3135 the shared library. */ 3136 if (!bfd_link_pic (info) 3137 && !h->def_regular) 3138 { 3139 h->root.u.def.section = s; 3140 h->root.u.def.value = s->size; 3141 } 3142 3143 h->plt.offset = s->size; 3144 3145 /* Make room for this entry. */ 3146 s->size += htab->plt_info->size; 3147 3148 /* We also need to make an entry in the .got.plt section, which 3149 will be placed in the .got section by the linker script. */ 3150 s = htab->root.sgotplt; 3151 BFD_ASSERT (s != NULL); 3152 s->size += 4; 3153 3154 /* We also need to make an entry in the .rela.plt section. */ 3155 s = htab->root.srelplt; 3156 BFD_ASSERT (s != NULL); 3157 s->size += sizeof (Elf32_External_Rela); 3158 3159 return TRUE; 3160 } 3161 3162 /* Reinitialize the plt offset now that it is not used as a reference 3163 count any more. */ 3164 h->plt.offset = (bfd_vma) -1; 3165 3166 /* If this is a weak symbol, and there is a real definition, the 3167 processor independent code will have arranged for us to see the 3168 real definition first, and we can just use the same value. */ 3169 if (h->u.weakdef != NULL) 3170 { 3171 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 3172 || h->u.weakdef->root.type == bfd_link_hash_defweak); 3173 h->root.u.def.section = h->u.weakdef->root.u.def.section; 3174 h->root.u.def.value = h->u.weakdef->root.u.def.value; 3175 return TRUE; 3176 } 3177 3178 /* This is a reference to a symbol defined by a dynamic object which 3179 is not a function. */ 3180 3181 /* If we are creating a shared library, we must presume that the 3182 only references to the symbol are via the global offset table. 3183 For such cases we need not do anything here; the relocations will 3184 be handled correctly by relocate_section. */ 3185 if (bfd_link_pic (info)) 3186 return TRUE; 3187 3188 /* If there are no references to this symbol that do not use the 3189 GOT, we don't need to generate a copy reloc. */ 3190 if (!h->non_got_ref) 3191 return TRUE; 3192 3193 /* We must allocate the symbol in our .dynbss section, which will 3194 become part of the .bss section of the executable. There will be 3195 an entry for this symbol in the .dynsym section. The dynamic 3196 object will contain position independent code, so all references 3197 from the dynamic object to this symbol will go through the global 3198 offset table. The dynamic linker will use the .dynsym entry to 3199 determine the address it must put in the global offset table, so 3200 both the dynamic object and the regular object will refer to the 3201 same memory location for the variable. */ 3202 3203 s = bfd_get_linker_section (dynobj, ".dynbss"); 3204 BFD_ASSERT (s != NULL); 3205 3206 /* We must generate a R_68K_COPY reloc to tell the dynamic linker to 3207 copy the initial value out of the dynamic object and into the 3208 runtime process image. We need to remember the offset into the 3209 .rela.bss section we are going to use. */ 3210 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) 3211 { 3212 asection *srel; 3213 3214 srel = bfd_get_linker_section (dynobj, ".rela.bss"); 3215 BFD_ASSERT (srel != NULL); 3216 srel->size += sizeof (Elf32_External_Rela); 3217 h->needs_copy = 1; 3218 } 3219 3220 return _bfd_elf_adjust_dynamic_copy (info, h, s); 3221} 3222 3223/* Set the sizes of the dynamic sections. */ 3224 3225static bfd_boolean 3226elf_m68k_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, 3227 struct bfd_link_info *info) 3228{ 3229 bfd *dynobj; 3230 asection *s; 3231 bfd_boolean plt; 3232 bfd_boolean relocs; 3233 3234 dynobj = elf_hash_table (info)->dynobj; 3235 BFD_ASSERT (dynobj != NULL); 3236 3237 if (elf_hash_table (info)->dynamic_sections_created) 3238 { 3239 /* Set the contents of the .interp section to the interpreter. */ 3240 if (bfd_link_executable (info) && !info->nointerp) 3241 { 3242 s = bfd_get_linker_section (dynobj, ".interp"); 3243 BFD_ASSERT (s != NULL); 3244 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 3245 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 3246 } 3247 } 3248 else 3249 { 3250 /* We may have created entries in the .rela.got section. 3251 However, if we are not creating the dynamic sections, we will 3252 not actually use these entries. Reset the size of .rela.got, 3253 which will cause it to get stripped from the output file 3254 below. */ 3255 s = elf_hash_table (info)->srelgot; 3256 if (s != NULL) 3257 s->size = 0; 3258 } 3259 3260 /* If this is a -Bsymbolic shared link, then we need to discard all 3261 PC relative relocs against symbols defined in a regular object. 3262 For the normal shared case we discard the PC relative relocs 3263 against symbols that have become local due to visibility changes. 3264 We allocated space for them in the check_relocs routine, but we 3265 will not fill them in in the relocate_section routine. */ 3266 if (bfd_link_pic (info)) 3267 elf_link_hash_traverse (elf_hash_table (info), 3268 elf_m68k_discard_copies, 3269 info); 3270 3271 /* The check_relocs and adjust_dynamic_symbol entry points have 3272 determined the sizes of the various dynamic sections. Allocate 3273 memory for them. */ 3274 plt = FALSE; 3275 relocs = FALSE; 3276 for (s = dynobj->sections; s != NULL; s = s->next) 3277 { 3278 const char *name; 3279 3280 if ((s->flags & SEC_LINKER_CREATED) == 0) 3281 continue; 3282 3283 /* It's OK to base decisions on the section name, because none 3284 of the dynobj section names depend upon the input files. */ 3285 name = bfd_get_section_name (dynobj, s); 3286 3287 if (strcmp (name, ".plt") == 0) 3288 { 3289 /* Remember whether there is a PLT. */ 3290 plt = s->size != 0; 3291 } 3292 else if (CONST_STRNEQ (name, ".rela")) 3293 { 3294 if (s->size != 0) 3295 { 3296 relocs = TRUE; 3297 3298 /* We use the reloc_count field as a counter if we need 3299 to copy relocs into the output file. */ 3300 s->reloc_count = 0; 3301 } 3302 } 3303 else if (! CONST_STRNEQ (name, ".got") 3304 && strcmp (name, ".dynbss") != 0) 3305 { 3306 /* It's not one of our sections, so don't allocate space. */ 3307 continue; 3308 } 3309 3310 if (s->size == 0) 3311 { 3312 /* If we don't need this section, strip it from the 3313 output file. This is mostly to handle .rela.bss and 3314 .rela.plt. We must create both sections in 3315 create_dynamic_sections, because they must be created 3316 before the linker maps input sections to output 3317 sections. The linker does that before 3318 adjust_dynamic_symbol is called, and it is that 3319 function which decides whether anything needs to go 3320 into these sections. */ 3321 s->flags |= SEC_EXCLUDE; 3322 continue; 3323 } 3324 3325 if ((s->flags & SEC_HAS_CONTENTS) == 0) 3326 continue; 3327 3328 /* Allocate memory for the section contents. */ 3329 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc. 3330 Unused entries should be reclaimed before the section's contents 3331 are written out, but at the moment this does not happen. Thus in 3332 order to prevent writing out garbage, we initialise the section's 3333 contents to zero. */ 3334 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); 3335 if (s->contents == NULL) 3336 return FALSE; 3337 } 3338 3339 if (elf_hash_table (info)->dynamic_sections_created) 3340 { 3341 /* Add some entries to the .dynamic section. We fill in the 3342 values later, in elf_m68k_finish_dynamic_sections, but we 3343 must add the entries now so that we get the correct size for 3344 the .dynamic section. The DT_DEBUG entry is filled in by the 3345 dynamic linker and used by the debugger. */ 3346#define add_dynamic_entry(TAG, VAL) \ 3347 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 3348 3349 if (bfd_link_executable (info)) 3350 { 3351 if (!add_dynamic_entry (DT_DEBUG, 0)) 3352 return FALSE; 3353 } 3354 3355 if (plt) 3356 { 3357 if (!add_dynamic_entry (DT_PLTGOT, 0) 3358 || !add_dynamic_entry (DT_PLTRELSZ, 0) 3359 || !add_dynamic_entry (DT_PLTREL, DT_RELA) 3360 || !add_dynamic_entry (DT_JMPREL, 0)) 3361 return FALSE; 3362 } 3363 3364 if (relocs) 3365 { 3366 if (!add_dynamic_entry (DT_RELA, 0) 3367 || !add_dynamic_entry (DT_RELASZ, 0) 3368 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela))) 3369 return FALSE; 3370 } 3371 3372 if ((info->flags & DF_TEXTREL) != 0) 3373 { 3374 if (!add_dynamic_entry (DT_TEXTREL, 0)) 3375 return FALSE; 3376 } 3377 } 3378#undef add_dynamic_entry 3379 3380 return TRUE; 3381} 3382 3383/* This function is called via elf_link_hash_traverse if we are 3384 creating a shared object. In the -Bsymbolic case it discards the 3385 space allocated to copy PC relative relocs against symbols which 3386 are defined in regular objects. For the normal shared case, it 3387 discards space for pc-relative relocs that have become local due to 3388 symbol visibility changes. We allocated space for them in the 3389 check_relocs routine, but we won't fill them in in the 3390 relocate_section routine. 3391 3392 We also check whether any of the remaining relocations apply 3393 against a readonly section, and set the DF_TEXTREL flag in this 3394 case. */ 3395 3396static bfd_boolean 3397elf_m68k_discard_copies (struct elf_link_hash_entry *h, 3398 void * inf) 3399{ 3400 struct bfd_link_info *info = (struct bfd_link_info *) inf; 3401 struct elf_m68k_pcrel_relocs_copied *s; 3402 3403 if (!SYMBOL_CALLS_LOCAL (info, h)) 3404 { 3405 if ((info->flags & DF_TEXTREL) == 0) 3406 { 3407 /* Look for relocations against read-only sections. */ 3408 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied; 3409 s != NULL; 3410 s = s->next) 3411 if ((s->section->flags & SEC_READONLY) != 0) 3412 { 3413 info->flags |= DF_TEXTREL; 3414 break; 3415 } 3416 } 3417 3418 /* Make sure undefined weak symbols are output as a dynamic symbol 3419 in PIEs. */ 3420 if (h->non_got_ref 3421 && h->root.type == bfd_link_hash_undefweak 3422 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 3423 && h->dynindx == -1 3424 && !h->forced_local) 3425 { 3426 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 3427 return FALSE; 3428 } 3429 3430 return TRUE; 3431 } 3432 3433 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied; 3434 s != NULL; 3435 s = s->next) 3436 s->section->size -= s->count * sizeof (Elf32_External_Rela); 3437 3438 return TRUE; 3439} 3440 3441 3442/* Install relocation RELA. */ 3443 3444static void 3445elf_m68k_install_rela (bfd *output_bfd, 3446 asection *srela, 3447 Elf_Internal_Rela *rela) 3448{ 3449 bfd_byte *loc; 3450 3451 loc = srela->contents; 3452 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela); 3453 bfd_elf32_swap_reloca_out (output_bfd, rela, loc); 3454} 3455 3456/* Find the base offsets for thread-local storage in this object, 3457 for GD/LD and IE/LE respectively. */ 3458 3459#define DTP_OFFSET 0x8000 3460#define TP_OFFSET 0x7000 3461 3462static bfd_vma 3463dtpoff_base (struct bfd_link_info *info) 3464{ 3465 /* If tls_sec is NULL, we should have signalled an error already. */ 3466 if (elf_hash_table (info)->tls_sec == NULL) 3467 return 0; 3468 return elf_hash_table (info)->tls_sec->vma + DTP_OFFSET; 3469} 3470 3471static bfd_vma 3472tpoff_base (struct bfd_link_info *info) 3473{ 3474 /* If tls_sec is NULL, we should have signalled an error already. */ 3475 if (elf_hash_table (info)->tls_sec == NULL) 3476 return 0; 3477 return elf_hash_table (info)->tls_sec->vma + TP_OFFSET; 3478} 3479 3480/* Output necessary relocation to handle a symbol during static link. 3481 This function is called from elf_m68k_relocate_section. */ 3482 3483static void 3484elf_m68k_init_got_entry_static (struct bfd_link_info *info, 3485 bfd *output_bfd, 3486 enum elf_m68k_reloc_type r_type, 3487 asection *sgot, 3488 bfd_vma got_entry_offset, 3489 bfd_vma relocation) 3490{ 3491 switch (elf_m68k_reloc_got_type (r_type)) 3492 { 3493 case R_68K_GOT32O: 3494 bfd_put_32 (output_bfd, relocation, sgot->contents + got_entry_offset); 3495 break; 3496 3497 case R_68K_TLS_GD32: 3498 /* We know the offset within the module, 3499 put it into the second GOT slot. */ 3500 bfd_put_32 (output_bfd, relocation - dtpoff_base (info), 3501 sgot->contents + got_entry_offset + 4); 3502 /* FALLTHRU */ 3503 3504 case R_68K_TLS_LDM32: 3505 /* Mark it as belonging to module 1, the executable. */ 3506 bfd_put_32 (output_bfd, 1, sgot->contents + got_entry_offset); 3507 break; 3508 3509 case R_68K_TLS_IE32: 3510 bfd_put_32 (output_bfd, relocation - tpoff_base (info), 3511 sgot->contents + got_entry_offset); 3512 break; 3513 3514 default: 3515 BFD_ASSERT (FALSE); 3516 } 3517} 3518 3519/* Output necessary relocation to handle a local symbol 3520 during dynamic link. 3521 This function is called either from elf_m68k_relocate_section 3522 or from elf_m68k_finish_dynamic_symbol. */ 3523 3524static void 3525elf_m68k_init_got_entry_local_shared (struct bfd_link_info *info, 3526 bfd *output_bfd, 3527 enum elf_m68k_reloc_type r_type, 3528 asection *sgot, 3529 bfd_vma got_entry_offset, 3530 bfd_vma relocation, 3531 asection *srela) 3532{ 3533 Elf_Internal_Rela outrel; 3534 3535 switch (elf_m68k_reloc_got_type (r_type)) 3536 { 3537 case R_68K_GOT32O: 3538 /* Emit RELATIVE relocation to initialize GOT slot 3539 at run-time. */ 3540 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE); 3541 outrel.r_addend = relocation; 3542 break; 3543 3544 case R_68K_TLS_GD32: 3545 /* We know the offset within the module, 3546 put it into the second GOT slot. */ 3547 bfd_put_32 (output_bfd, relocation - dtpoff_base (info), 3548 sgot->contents + got_entry_offset + 4); 3549 /* FALLTHRU */ 3550 3551 case R_68K_TLS_LDM32: 3552 /* We don't know the module number, 3553 create a relocation for it. */ 3554 outrel.r_info = ELF32_R_INFO (0, R_68K_TLS_DTPMOD32); 3555 outrel.r_addend = 0; 3556 break; 3557 3558 case R_68K_TLS_IE32: 3559 /* Emit TPREL relocation to initialize GOT slot 3560 at run-time. */ 3561 outrel.r_info = ELF32_R_INFO (0, R_68K_TLS_TPREL32); 3562 outrel.r_addend = relocation - elf_hash_table (info)->tls_sec->vma; 3563 break; 3564 3565 default: 3566 BFD_ASSERT (FALSE); 3567 } 3568 3569 /* Offset of the GOT entry. */ 3570 outrel.r_offset = (sgot->output_section->vma 3571 + sgot->output_offset 3572 + got_entry_offset); 3573 3574 /* Install one of the above relocations. */ 3575 elf_m68k_install_rela (output_bfd, srela, &outrel); 3576 3577 bfd_put_32 (output_bfd, outrel.r_addend, sgot->contents + got_entry_offset); 3578} 3579 3580/* Relocate an M68K ELF section. */ 3581 3582static bfd_boolean 3583elf_m68k_relocate_section (bfd *output_bfd, 3584 struct bfd_link_info *info, 3585 bfd *input_bfd, 3586 asection *input_section, 3587 bfd_byte *contents, 3588 Elf_Internal_Rela *relocs, 3589 Elf_Internal_Sym *local_syms, 3590 asection **local_sections) 3591{ 3592 Elf_Internal_Shdr *symtab_hdr; 3593 struct elf_link_hash_entry **sym_hashes; 3594 asection *sgot; 3595 asection *splt; 3596 asection *sreloc; 3597 asection *srela; 3598 struct elf_m68k_got *got; 3599 Elf_Internal_Rela *rel; 3600 Elf_Internal_Rela *relend; 3601 3602 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 3603 sym_hashes = elf_sym_hashes (input_bfd); 3604 3605 sgot = NULL; 3606 splt = NULL; 3607 sreloc = NULL; 3608 srela = NULL; 3609 3610 got = NULL; 3611 3612 rel = relocs; 3613 relend = relocs + input_section->reloc_count; 3614 for (; rel < relend; rel++) 3615 { 3616 int r_type; 3617 reloc_howto_type *howto; 3618 unsigned long r_symndx; 3619 struct elf_link_hash_entry *h; 3620 Elf_Internal_Sym *sym; 3621 asection *sec; 3622 bfd_vma relocation; 3623 bfd_boolean unresolved_reloc; 3624 bfd_reloc_status_type r; 3625 3626 r_type = ELF32_R_TYPE (rel->r_info); 3627 if (r_type < 0 || r_type >= (int) R_68K_max) 3628 { 3629 bfd_set_error (bfd_error_bad_value); 3630 return FALSE; 3631 } 3632 howto = howto_table + r_type; 3633 3634 r_symndx = ELF32_R_SYM (rel->r_info); 3635 3636 h = NULL; 3637 sym = NULL; 3638 sec = NULL; 3639 unresolved_reloc = FALSE; 3640 3641 if (r_symndx < symtab_hdr->sh_info) 3642 { 3643 sym = local_syms + r_symndx; 3644 sec = local_sections[r_symndx]; 3645 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 3646 } 3647 else 3648 { 3649 bfd_boolean warned, ignored; 3650 3651 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 3652 r_symndx, symtab_hdr, sym_hashes, 3653 h, sec, relocation, 3654 unresolved_reloc, warned, ignored); 3655 } 3656 3657 if (sec != NULL && discarded_section (sec)) 3658 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 3659 rel, 1, relend, howto, 0, contents); 3660 3661 if (bfd_link_relocatable (info)) 3662 continue; 3663 3664 switch (r_type) 3665 { 3666 case R_68K_GOT8: 3667 case R_68K_GOT16: 3668 case R_68K_GOT32: 3669 /* Relocation is to the address of the entry for this symbol 3670 in the global offset table. */ 3671 if (h != NULL 3672 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) 3673 { 3674 if (elf_m68k_hash_table (info)->local_gp_p) 3675 { 3676 bfd_vma sgot_output_offset; 3677 bfd_vma got_offset; 3678 3679 sgot = elf_hash_table (info)->sgot; 3680 3681 if (sgot != NULL) 3682 sgot_output_offset = sgot->output_offset; 3683 else 3684 /* In this case we have a reference to 3685 _GLOBAL_OFFSET_TABLE_, but the GOT itself is 3686 empty. 3687 ??? Issue a warning? */ 3688 sgot_output_offset = 0; 3689 3690 if (got == NULL) 3691 { 3692 struct elf_m68k_bfd2got_entry *bfd2got_entry; 3693 3694 bfd2got_entry 3695 = elf_m68k_get_bfd2got_entry (elf_m68k_multi_got (info), 3696 input_bfd, SEARCH, NULL); 3697 3698 if (bfd2got_entry != NULL) 3699 { 3700 got = bfd2got_entry->got; 3701 BFD_ASSERT (got != NULL); 3702 3703 got_offset = got->offset; 3704 } 3705 else 3706 /* In this case we have a reference to 3707 _GLOBAL_OFFSET_TABLE_, but no other references 3708 accessing any GOT entries. 3709 ??? Issue a warning? */ 3710 got_offset = 0; 3711 } 3712 else 3713 got_offset = got->offset; 3714 3715 /* Adjust GOT pointer to point to the GOT 3716 assigned to input_bfd. */ 3717 rel->r_addend += sgot_output_offset + got_offset; 3718 } 3719 else 3720 BFD_ASSERT (got == NULL || got->offset == 0); 3721 3722 break; 3723 } 3724 /* Fall through. */ 3725 case R_68K_GOT8O: 3726 case R_68K_GOT16O: 3727 case R_68K_GOT32O: 3728 3729 case R_68K_TLS_LDM32: 3730 case R_68K_TLS_LDM16: 3731 case R_68K_TLS_LDM8: 3732 3733 case R_68K_TLS_GD8: 3734 case R_68K_TLS_GD16: 3735 case R_68K_TLS_GD32: 3736 3737 case R_68K_TLS_IE8: 3738 case R_68K_TLS_IE16: 3739 case R_68K_TLS_IE32: 3740 3741 /* Relocation is the offset of the entry for this symbol in 3742 the global offset table. */ 3743 3744 { 3745 struct elf_m68k_got_entry_key key_; 3746 bfd_vma *off_ptr; 3747 bfd_vma off; 3748 3749 sgot = elf_hash_table (info)->sgot; 3750 BFD_ASSERT (sgot != NULL); 3751 3752 if (got == NULL) 3753 { 3754 got = elf_m68k_get_bfd2got_entry (elf_m68k_multi_got (info), 3755 input_bfd, MUST_FIND, 3756 NULL)->got; 3757 BFD_ASSERT (got != NULL); 3758 } 3759 3760 /* Get GOT offset for this symbol. */ 3761 elf_m68k_init_got_entry_key (&key_, h, input_bfd, r_symndx, 3762 r_type); 3763 off_ptr = &elf_m68k_get_got_entry (got, &key_, MUST_FIND, 3764 NULL)->u.s2.offset; 3765 off = *off_ptr; 3766 3767 /* The offset must always be a multiple of 4. We use 3768 the least significant bit to record whether we have 3769 already generated the necessary reloc. */ 3770 if ((off & 1) != 0) 3771 off &= ~1; 3772 else 3773 { 3774 if (h != NULL 3775 /* @TLSLDM relocations are bounded to the module, in 3776 which the symbol is defined -- not to the symbol 3777 itself. */ 3778 && elf_m68k_reloc_got_type (r_type) != R_68K_TLS_LDM32) 3779 { 3780 bfd_boolean dyn; 3781 3782 dyn = elf_hash_table (info)->dynamic_sections_created; 3783 if (!WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 3784 bfd_link_pic (info), 3785 h) 3786 || (bfd_link_pic (info) 3787 && SYMBOL_REFERENCES_LOCAL (info, h)) 3788 || (ELF_ST_VISIBILITY (h->other) 3789 && h->root.type == bfd_link_hash_undefweak)) 3790 { 3791 /* This is actually a static link, or it is a 3792 -Bsymbolic link and the symbol is defined 3793 locally, or the symbol was forced to be local 3794 because of a version file. We must initialize 3795 this entry in the global offset table. Since 3796 the offset must always be a multiple of 4, we 3797 use the least significant bit to record whether 3798 we have initialized it already. 3799 3800 When doing a dynamic link, we create a .rela.got 3801 relocation entry to initialize the value. This 3802 is done in the finish_dynamic_symbol routine. */ 3803 3804 elf_m68k_init_got_entry_static (info, 3805 output_bfd, 3806 r_type, 3807 sgot, 3808 off, 3809 relocation); 3810 3811 *off_ptr |= 1; 3812 } 3813 else 3814 unresolved_reloc = FALSE; 3815 } 3816 else if (bfd_link_pic (info)) /* && h == NULL */ 3817 /* Process local symbol during dynamic link. */ 3818 { 3819 srela = elf_hash_table (info)->srelgot; 3820 BFD_ASSERT (srela != NULL); 3821 3822 elf_m68k_init_got_entry_local_shared (info, 3823 output_bfd, 3824 r_type, 3825 sgot, 3826 off, 3827 relocation, 3828 srela); 3829 3830 *off_ptr |= 1; 3831 } 3832 else /* h == NULL && !bfd_link_pic (info) */ 3833 { 3834 elf_m68k_init_got_entry_static (info, 3835 output_bfd, 3836 r_type, 3837 sgot, 3838 off, 3839 relocation); 3840 3841 *off_ptr |= 1; 3842 } 3843 } 3844 3845 /* We don't use elf_m68k_reloc_got_type in the condition below 3846 because this is the only place where difference between 3847 R_68K_GOTx and R_68K_GOTxO relocations matters. */ 3848 if (r_type == R_68K_GOT32O 3849 || r_type == R_68K_GOT16O 3850 || r_type == R_68K_GOT8O 3851 || elf_m68k_reloc_got_type (r_type) == R_68K_TLS_GD32 3852 || elf_m68k_reloc_got_type (r_type) == R_68K_TLS_LDM32 3853 || elf_m68k_reloc_got_type (r_type) == R_68K_TLS_IE32) 3854 { 3855 /* GOT pointer is adjusted to point to the start/middle 3856 of local GOT. Adjust the offset accordingly. */ 3857 BFD_ASSERT (elf_m68k_hash_table (info)->use_neg_got_offsets_p 3858 || off >= got->offset); 3859 3860 if (elf_m68k_hash_table (info)->local_gp_p) 3861 relocation = off - got->offset; 3862 else 3863 { 3864 BFD_ASSERT (got->offset == 0); 3865 relocation = sgot->output_offset + off; 3866 } 3867 3868 /* This relocation does not use the addend. */ 3869 rel->r_addend = 0; 3870 } 3871 else 3872 relocation = (sgot->output_section->vma + sgot->output_offset 3873 + off); 3874 } 3875 break; 3876 3877 case R_68K_TLS_LDO32: 3878 case R_68K_TLS_LDO16: 3879 case R_68K_TLS_LDO8: 3880 relocation -= dtpoff_base (info); 3881 break; 3882 3883 case R_68K_TLS_LE32: 3884 case R_68K_TLS_LE16: 3885 case R_68K_TLS_LE8: 3886 if (bfd_link_dll (info)) 3887 { 3888 _bfd_error_handler 3889 /* xgettext:c-format */ 3890 (_("%B(%A+0x%lx): R_68K_TLS_LE32 relocation not permitted " 3891 "in shared object"), 3892 input_bfd, input_section, (long) rel->r_offset, howto->name); 3893 3894 return FALSE; 3895 } 3896 else 3897 relocation -= tpoff_base (info); 3898 3899 break; 3900 3901 case R_68K_PLT8: 3902 case R_68K_PLT16: 3903 case R_68K_PLT32: 3904 /* Relocation is to the entry for this symbol in the 3905 procedure linkage table. */ 3906 3907 /* Resolve a PLTxx reloc against a local symbol directly, 3908 without using the procedure linkage table. */ 3909 if (h == NULL) 3910 break; 3911 3912 if (h->plt.offset == (bfd_vma) -1 3913 || !elf_hash_table (info)->dynamic_sections_created) 3914 { 3915 /* We didn't make a PLT entry for this symbol. This 3916 happens when statically linking PIC code, or when 3917 using -Bsymbolic. */ 3918 break; 3919 } 3920 3921 splt = elf_hash_table (info)->splt; 3922 BFD_ASSERT (splt != NULL); 3923 3924 relocation = (splt->output_section->vma 3925 + splt->output_offset 3926 + h->plt.offset); 3927 unresolved_reloc = FALSE; 3928 break; 3929 3930 case R_68K_PLT8O: 3931 case R_68K_PLT16O: 3932 case R_68K_PLT32O: 3933 /* Relocation is the offset of the entry for this symbol in 3934 the procedure linkage table. */ 3935 BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1); 3936 3937 splt = elf_hash_table (info)->splt; 3938 BFD_ASSERT (splt != NULL); 3939 3940 relocation = h->plt.offset; 3941 unresolved_reloc = FALSE; 3942 3943 /* This relocation does not use the addend. */ 3944 rel->r_addend = 0; 3945 3946 break; 3947 3948 case R_68K_8: 3949 case R_68K_16: 3950 case R_68K_32: 3951 case R_68K_PC8: 3952 case R_68K_PC16: 3953 case R_68K_PC32: 3954 if (bfd_link_pic (info) 3955 && r_symndx != STN_UNDEF 3956 && (input_section->flags & SEC_ALLOC) != 0 3957 && (h == NULL 3958 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 3959 || h->root.type != bfd_link_hash_undefweak) 3960 && ((r_type != R_68K_PC8 3961 && r_type != R_68K_PC16 3962 && r_type != R_68K_PC32) 3963 || !SYMBOL_CALLS_LOCAL (info, h))) 3964 { 3965 Elf_Internal_Rela outrel; 3966 bfd_byte *loc; 3967 bfd_boolean skip, relocate; 3968 3969 /* When generating a shared object, these relocations 3970 are copied into the output file to be resolved at run 3971 time. */ 3972 3973 skip = FALSE; 3974 relocate = FALSE; 3975 3976 outrel.r_offset = 3977 _bfd_elf_section_offset (output_bfd, info, input_section, 3978 rel->r_offset); 3979 if (outrel.r_offset == (bfd_vma) -1) 3980 skip = TRUE; 3981 else if (outrel.r_offset == (bfd_vma) -2) 3982 skip = TRUE, relocate = TRUE; 3983 outrel.r_offset += (input_section->output_section->vma 3984 + input_section->output_offset); 3985 3986 if (skip) 3987 memset (&outrel, 0, sizeof outrel); 3988 else if (h != NULL 3989 && h->dynindx != -1 3990 && (r_type == R_68K_PC8 3991 || r_type == R_68K_PC16 3992 || r_type == R_68K_PC32 3993 || !bfd_link_pic (info) 3994 || !SYMBOLIC_BIND (info, h) 3995 || !h->def_regular)) 3996 { 3997 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 3998 outrel.r_addend = rel->r_addend; 3999 } 4000 else 4001 { 4002 /* This symbol is local, or marked to become local. */ 4003 outrel.r_addend = relocation + rel->r_addend; 4004 4005 if (r_type == R_68K_32) 4006 { 4007 relocate = TRUE; 4008 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE); 4009 } 4010 else 4011 { 4012 long indx; 4013 4014 if (bfd_is_abs_section (sec)) 4015 indx = 0; 4016 else if (sec == NULL || sec->owner == NULL) 4017 { 4018 bfd_set_error (bfd_error_bad_value); 4019 return FALSE; 4020 } 4021 else 4022 { 4023 asection *osec; 4024 4025 /* We are turning this relocation into one 4026 against a section symbol. It would be 4027 proper to subtract the symbol's value, 4028 osec->vma, from the emitted reloc addend, 4029 but ld.so expects buggy relocs. */ 4030 osec = sec->output_section; 4031 indx = elf_section_data (osec)->dynindx; 4032 if (indx == 0) 4033 { 4034 struct elf_link_hash_table *htab; 4035 htab = elf_hash_table (info); 4036 osec = htab->text_index_section; 4037 indx = elf_section_data (osec)->dynindx; 4038 } 4039 BFD_ASSERT (indx != 0); 4040 } 4041 4042 outrel.r_info = ELF32_R_INFO (indx, r_type); 4043 } 4044 } 4045 4046 sreloc = elf_section_data (input_section)->sreloc; 4047 if (sreloc == NULL) 4048 abort (); 4049 4050 loc = sreloc->contents; 4051 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); 4052 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 4053 4054 /* This reloc will be computed at runtime, so there's no 4055 need to do anything now, except for R_68K_32 4056 relocations that have been turned into 4057 R_68K_RELATIVE. */ 4058 if (!relocate) 4059 continue; 4060 } 4061 4062 break; 4063 4064 case R_68K_GNU_VTINHERIT: 4065 case R_68K_GNU_VTENTRY: 4066 /* These are no-ops in the end. */ 4067 continue; 4068 4069 default: 4070 break; 4071 } 4072 4073 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 4074 because such sections are not SEC_ALLOC and thus ld.so will 4075 not process them. */ 4076 if (unresolved_reloc 4077 && !((input_section->flags & SEC_DEBUGGING) != 0 4078 && h->def_dynamic) 4079 && _bfd_elf_section_offset (output_bfd, info, input_section, 4080 rel->r_offset) != (bfd_vma) -1) 4081 { 4082 _bfd_error_handler 4083 /* xgettext:c-format */ 4084 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), 4085 input_bfd, 4086 input_section, 4087 (long) rel->r_offset, 4088 howto->name, 4089 h->root.root.string); 4090 return FALSE; 4091 } 4092 4093 if (r_symndx != STN_UNDEF 4094 && r_type != R_68K_NONE 4095 && (h == NULL 4096 || h->root.type == bfd_link_hash_defined 4097 || h->root.type == bfd_link_hash_defweak)) 4098 { 4099 char sym_type; 4100 4101 sym_type = (sym != NULL) ? ELF32_ST_TYPE (sym->st_info) : h->type; 4102 4103 if (elf_m68k_reloc_tls_p (r_type) != (sym_type == STT_TLS)) 4104 { 4105 const char *name; 4106 4107 if (h != NULL) 4108 name = h->root.root.string; 4109 else 4110 { 4111 name = (bfd_elf_string_from_elf_section 4112 (input_bfd, symtab_hdr->sh_link, sym->st_name)); 4113 if (name == NULL || *name == '\0') 4114 name = bfd_section_name (input_bfd, sec); 4115 } 4116 4117 _bfd_error_handler 4118 ((sym_type == STT_TLS 4119 /* xgettext:c-format */ 4120 ? _("%B(%A+0x%lx): %s used with TLS symbol %s") 4121 /* xgettext:c-format */ 4122 : _("%B(%A+0x%lx): %s used with non-TLS symbol %s")), 4123 input_bfd, 4124 input_section, 4125 (long) rel->r_offset, 4126 howto->name, 4127 name); 4128 } 4129 } 4130 4131 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 4132 contents, rel->r_offset, 4133 relocation, rel->r_addend); 4134 4135 if (r != bfd_reloc_ok) 4136 { 4137 const char *name; 4138 4139 if (h != NULL) 4140 name = h->root.root.string; 4141 else 4142 { 4143 name = bfd_elf_string_from_elf_section (input_bfd, 4144 symtab_hdr->sh_link, 4145 sym->st_name); 4146 if (name == NULL) 4147 return FALSE; 4148 if (*name == '\0') 4149 name = bfd_section_name (input_bfd, sec); 4150 } 4151 4152 if (r == bfd_reloc_overflow) 4153 (*info->callbacks->reloc_overflow) 4154 (info, (h ? &h->root : NULL), name, howto->name, 4155 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 4156 else 4157 { 4158 _bfd_error_handler 4159 /* xgettext:c-format */ 4160 (_("%B(%A+0x%lx): reloc against `%s': error %d"), 4161 input_bfd, input_section, 4162 (long) rel->r_offset, name, (int) r); 4163 return FALSE; 4164 } 4165 } 4166 } 4167 4168 return TRUE; 4169} 4170 4171/* Install an M_68K_PC32 relocation against VALUE at offset OFFSET 4172 into section SEC. */ 4173 4174static void 4175elf_m68k_install_pc32 (asection *sec, bfd_vma offset, bfd_vma value) 4176{ 4177 /* Make VALUE PC-relative. */ 4178 value -= sec->output_section->vma + offset; 4179 4180 /* Apply any in-place addend. */ 4181 value += bfd_get_32 (sec->owner, sec->contents + offset); 4182 4183 bfd_put_32 (sec->owner, value, sec->contents + offset); 4184} 4185 4186/* Finish up dynamic symbol handling. We set the contents of various 4187 dynamic sections here. */ 4188 4189static bfd_boolean 4190elf_m68k_finish_dynamic_symbol (bfd *output_bfd, 4191 struct bfd_link_info *info, 4192 struct elf_link_hash_entry *h, 4193 Elf_Internal_Sym *sym) 4194{ 4195 bfd *dynobj; 4196 4197 dynobj = elf_hash_table (info)->dynobj; 4198 4199 if (h->plt.offset != (bfd_vma) -1) 4200 { 4201 const struct elf_m68k_plt_info *plt_info; 4202 asection *splt; 4203 asection *sgot; 4204 asection *srela; 4205 bfd_vma plt_index; 4206 bfd_vma got_offset; 4207 Elf_Internal_Rela rela; 4208 bfd_byte *loc; 4209 4210 /* This symbol has an entry in the procedure linkage table. Set 4211 it up. */ 4212 4213 BFD_ASSERT (h->dynindx != -1); 4214 4215 plt_info = elf_m68k_hash_table (info)->plt_info; 4216 splt = elf_hash_table (info)->splt; 4217 sgot = elf_hash_table (info)->sgotplt; 4218 srela = elf_hash_table (info)->srelplt; 4219 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL); 4220 4221 /* Get the index in the procedure linkage table which 4222 corresponds to this symbol. This is the index of this symbol 4223 in all the symbols for which we are making plt entries. The 4224 first entry in the procedure linkage table is reserved. */ 4225 plt_index = (h->plt.offset / plt_info->size) - 1; 4226 4227 /* Get the offset into the .got table of the entry that 4228 corresponds to this function. Each .got entry is 4 bytes. 4229 The first three are reserved. */ 4230 got_offset = (plt_index + 3) * 4; 4231 4232 memcpy (splt->contents + h->plt.offset, 4233 plt_info->symbol_entry, 4234 plt_info->size); 4235 4236 elf_m68k_install_pc32 (splt, h->plt.offset + plt_info->symbol_relocs.got, 4237 (sgot->output_section->vma 4238 + sgot->output_offset 4239 + got_offset)); 4240 4241 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela), 4242 splt->contents 4243 + h->plt.offset 4244 + plt_info->symbol_resolve_entry + 2); 4245 4246 elf_m68k_install_pc32 (splt, h->plt.offset + plt_info->symbol_relocs.plt, 4247 splt->output_section->vma); 4248 4249 /* Fill in the entry in the global offset table. */ 4250 bfd_put_32 (output_bfd, 4251 (splt->output_section->vma 4252 + splt->output_offset 4253 + h->plt.offset 4254 + plt_info->symbol_resolve_entry), 4255 sgot->contents + got_offset); 4256 4257 /* Fill in the entry in the .rela.plt section. */ 4258 rela.r_offset = (sgot->output_section->vma 4259 + sgot->output_offset 4260 + got_offset); 4261 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT); 4262 rela.r_addend = 0; 4263 loc = srela->contents + plt_index * sizeof (Elf32_External_Rela); 4264 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 4265 4266 if (!h->def_regular) 4267 { 4268 /* Mark the symbol as undefined, rather than as defined in 4269 the .plt section. Leave the value alone. */ 4270 sym->st_shndx = SHN_UNDEF; 4271 } 4272 } 4273 4274 if (elf_m68k_hash_entry (h)->glist != NULL) 4275 { 4276 asection *sgot; 4277 asection *srela; 4278 struct elf_m68k_got_entry *got_entry; 4279 4280 /* This symbol has an entry in the global offset table. Set it 4281 up. */ 4282 4283 sgot = elf_hash_table (info)->sgot; 4284 srela = elf_hash_table (info)->srelgot; 4285 BFD_ASSERT (sgot != NULL && srela != NULL); 4286 4287 got_entry = elf_m68k_hash_entry (h)->glist; 4288 4289 while (got_entry != NULL) 4290 { 4291 enum elf_m68k_reloc_type r_type; 4292 bfd_vma got_entry_offset; 4293 4294 r_type = got_entry->key_.type; 4295 got_entry_offset = got_entry->u.s2.offset &~ (bfd_vma) 1; 4296 4297 /* If this is a -Bsymbolic link, and the symbol is defined 4298 locally, we just want to emit a RELATIVE reloc. Likewise if 4299 the symbol was forced to be local because of a version file. 4300 The entry in the global offset table already have been 4301 initialized in the relocate_section function. */ 4302 if (bfd_link_pic (info) 4303 && SYMBOL_REFERENCES_LOCAL (info, h)) 4304 { 4305 bfd_vma relocation; 4306 4307 relocation = bfd_get_signed_32 (output_bfd, 4308 (sgot->contents 4309 + got_entry_offset)); 4310 4311 /* Undo TP bias. */ 4312 switch (elf_m68k_reloc_got_type (r_type)) 4313 { 4314 case R_68K_GOT32O: 4315 case R_68K_TLS_LDM32: 4316 break; 4317 4318 case R_68K_TLS_GD32: 4319 /* The value for this relocation is actually put in 4320 the second GOT slot. */ 4321 relocation = bfd_get_signed_32 (output_bfd, 4322 (sgot->contents 4323 + got_entry_offset + 4)); 4324 relocation += dtpoff_base (info); 4325 break; 4326 4327 case R_68K_TLS_IE32: 4328 relocation += tpoff_base (info); 4329 break; 4330 4331 default: 4332 BFD_ASSERT (FALSE); 4333 } 4334 4335 elf_m68k_init_got_entry_local_shared (info, 4336 output_bfd, 4337 r_type, 4338 sgot, 4339 got_entry_offset, 4340 relocation, 4341 srela); 4342 } 4343 else 4344 { 4345 Elf_Internal_Rela rela; 4346 4347 /* Put zeros to GOT slots that will be initialized 4348 at run-time. */ 4349 { 4350 bfd_vma n_slots; 4351 4352 n_slots = elf_m68k_reloc_got_n_slots (got_entry->key_.type); 4353 while (n_slots--) 4354 bfd_put_32 (output_bfd, (bfd_vma) 0, 4355 (sgot->contents + got_entry_offset 4356 + 4 * n_slots)); 4357 } 4358 4359 rela.r_addend = 0; 4360 rela.r_offset = (sgot->output_section->vma 4361 + sgot->output_offset 4362 + got_entry_offset); 4363 4364 switch (elf_m68k_reloc_got_type (r_type)) 4365 { 4366 case R_68K_GOT32O: 4367 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT); 4368 elf_m68k_install_rela (output_bfd, srela, &rela); 4369 break; 4370 4371 case R_68K_TLS_GD32: 4372 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_TLS_DTPMOD32); 4373 elf_m68k_install_rela (output_bfd, srela, &rela); 4374 4375 rela.r_offset += 4; 4376 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_TLS_DTPREL32); 4377 elf_m68k_install_rela (output_bfd, srela, &rela); 4378 break; 4379 4380 case R_68K_TLS_IE32: 4381 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_TLS_TPREL32); 4382 elf_m68k_install_rela (output_bfd, srela, &rela); 4383 break; 4384 4385 default: 4386 BFD_ASSERT (FALSE); 4387 break; 4388 } 4389 } 4390 4391 got_entry = got_entry->u.s2.next; 4392 } 4393 } 4394 4395 if (h->needs_copy) 4396 { 4397 asection *s; 4398 Elf_Internal_Rela rela; 4399 bfd_byte *loc; 4400 4401 /* This symbol needs a copy reloc. Set it up. */ 4402 4403 BFD_ASSERT (h->dynindx != -1 4404 && (h->root.type == bfd_link_hash_defined 4405 || h->root.type == bfd_link_hash_defweak)); 4406 4407 s = bfd_get_linker_section (dynobj, ".rela.bss"); 4408 BFD_ASSERT (s != NULL); 4409 4410 rela.r_offset = (h->root.u.def.value 4411 + h->root.u.def.section->output_section->vma 4412 + h->root.u.def.section->output_offset); 4413 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY); 4414 rela.r_addend = 0; 4415 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela); 4416 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 4417 } 4418 4419 return TRUE; 4420} 4421 4422/* Finish up the dynamic sections. */ 4423 4424static bfd_boolean 4425elf_m68k_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) 4426{ 4427 bfd *dynobj; 4428 asection *sgot; 4429 asection *sdyn; 4430 4431 dynobj = elf_hash_table (info)->dynobj; 4432 4433 sgot = elf_hash_table (info)->sgotplt; 4434 BFD_ASSERT (sgot != NULL); 4435 sdyn = bfd_get_linker_section (dynobj, ".dynamic"); 4436 4437 if (elf_hash_table (info)->dynamic_sections_created) 4438 { 4439 asection *splt; 4440 Elf32_External_Dyn *dyncon, *dynconend; 4441 4442 splt = elf_hash_table (info)->splt; 4443 BFD_ASSERT (splt != NULL && sdyn != NULL); 4444 4445 dyncon = (Elf32_External_Dyn *) sdyn->contents; 4446 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 4447 for (; dyncon < dynconend; dyncon++) 4448 { 4449 Elf_Internal_Dyn dyn; 4450 asection *s; 4451 4452 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 4453 4454 switch (dyn.d_tag) 4455 { 4456 default: 4457 break; 4458 4459 case DT_PLTGOT: 4460 s = elf_hash_table (info)->sgotplt; 4461 goto get_vma; 4462 case DT_JMPREL: 4463 s = elf_hash_table (info)->srelplt; 4464 get_vma: 4465 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 4466 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 4467 break; 4468 4469 case DT_PLTRELSZ: 4470 s = elf_hash_table (info)->srelplt; 4471 dyn.d_un.d_val = s->size; 4472 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 4473 break; 4474 } 4475 } 4476 4477 /* Fill in the first entry in the procedure linkage table. */ 4478 if (splt->size > 0) 4479 { 4480 const struct elf_m68k_plt_info *plt_info; 4481 4482 plt_info = elf_m68k_hash_table (info)->plt_info; 4483 memcpy (splt->contents, plt_info->plt0_entry, plt_info->size); 4484 4485 elf_m68k_install_pc32 (splt, plt_info->plt0_relocs.got4, 4486 (sgot->output_section->vma 4487 + sgot->output_offset 4488 + 4)); 4489 4490 elf_m68k_install_pc32 (splt, plt_info->plt0_relocs.got8, 4491 (sgot->output_section->vma 4492 + sgot->output_offset 4493 + 8)); 4494 4495 elf_section_data (splt->output_section)->this_hdr.sh_entsize 4496 = plt_info->size; 4497 } 4498 } 4499 4500 /* Fill in the first three entries in the global offset table. */ 4501 if (sgot->size > 0) 4502 { 4503 if (sdyn == NULL) 4504 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); 4505 else 4506 bfd_put_32 (output_bfd, 4507 sdyn->output_section->vma + sdyn->output_offset, 4508 sgot->contents); 4509 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); 4510 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); 4511 } 4512 4513 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; 4514 4515 return TRUE; 4516} 4517 4518/* Given a .data section and a .emreloc in-memory section, store 4519 relocation information into the .emreloc section which can be 4520 used at runtime to relocate the section. This is called by the 4521 linker when the --embedded-relocs switch is used. This is called 4522 after the add_symbols entry point has been called for all the 4523 objects, and before the final_link entry point is called. */ 4524 4525bfd_boolean 4526bfd_m68k_elf32_create_embedded_relocs (bfd *abfd, struct bfd_link_info *info, 4527 asection *datasec, asection *relsec, 4528 char **errmsg) 4529{ 4530 Elf_Internal_Shdr *symtab_hdr; 4531 Elf_Internal_Sym *isymbuf = NULL; 4532 Elf_Internal_Rela *internal_relocs = NULL; 4533 Elf_Internal_Rela *irel, *irelend; 4534 bfd_byte *p; 4535 bfd_size_type amt; 4536 4537 BFD_ASSERT (! bfd_link_relocatable (info)); 4538 4539 *errmsg = NULL; 4540 4541 if (datasec->reloc_count == 0) 4542 return TRUE; 4543 4544 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 4545 4546 /* Get a copy of the native relocations. */ 4547 internal_relocs = (_bfd_elf_link_read_relocs 4548 (abfd, datasec, NULL, (Elf_Internal_Rela *) NULL, 4549 info->keep_memory)); 4550 if (internal_relocs == NULL) 4551 goto error_return; 4552 4553 amt = (bfd_size_type) datasec->reloc_count * 12; 4554 relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt); 4555 if (relsec->contents == NULL) 4556 goto error_return; 4557 4558 p = relsec->contents; 4559 4560 irelend = internal_relocs + datasec->reloc_count; 4561 for (irel = internal_relocs; irel < irelend; irel++, p += 12) 4562 { 4563 asection *targetsec; 4564 4565 /* We are going to write a four byte longword into the runtime 4566 reloc section. The longword will be the address in the data 4567 section which must be relocated. It is followed by the name 4568 of the target section NUL-padded or truncated to 8 4569 characters. */ 4570 4571 /* We can only relocate absolute longword relocs at run time. */ 4572 if (ELF32_R_TYPE (irel->r_info) != (int) R_68K_32) 4573 { 4574 *errmsg = _("unsupported reloc type"); 4575 bfd_set_error (bfd_error_bad_value); 4576 goto error_return; 4577 } 4578 4579 /* Get the target section referred to by the reloc. */ 4580 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) 4581 { 4582 /* A local symbol. */ 4583 Elf_Internal_Sym *isym; 4584 4585 /* Read this BFD's local symbols if we haven't done so already. */ 4586 if (isymbuf == NULL) 4587 { 4588 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 4589 if (isymbuf == NULL) 4590 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, 4591 symtab_hdr->sh_info, 0, 4592 NULL, NULL, NULL); 4593 if (isymbuf == NULL) 4594 goto error_return; 4595 } 4596 4597 isym = isymbuf + ELF32_R_SYM (irel->r_info); 4598 targetsec = bfd_section_from_elf_index (abfd, isym->st_shndx); 4599 } 4600 else 4601 { 4602 unsigned long indx; 4603 struct elf_link_hash_entry *h; 4604 4605 /* An external symbol. */ 4606 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; 4607 h = elf_sym_hashes (abfd)[indx]; 4608 BFD_ASSERT (h != NULL); 4609 if (h->root.type == bfd_link_hash_defined 4610 || h->root.type == bfd_link_hash_defweak) 4611 targetsec = h->root.u.def.section; 4612 else 4613 targetsec = NULL; 4614 } 4615 4616 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p); 4617 memset (p + 4, 0, 8); 4618 if (targetsec != NULL) 4619 strncpy ((char *) p + 4, targetsec->output_section->name, 8); 4620 } 4621 4622 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) 4623 free (isymbuf); 4624 if (internal_relocs != NULL 4625 && elf_section_data (datasec)->relocs != internal_relocs) 4626 free (internal_relocs); 4627 return TRUE; 4628 4629error_return: 4630 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) 4631 free (isymbuf); 4632 if (internal_relocs != NULL 4633 && elf_section_data (datasec)->relocs != internal_relocs) 4634 free (internal_relocs); 4635 return FALSE; 4636} 4637 4638/* Set target options. */ 4639 4640void 4641bfd_elf_m68k_set_target_options (struct bfd_link_info *info, int got_handling) 4642{ 4643 struct elf_m68k_link_hash_table *htab; 4644 bfd_boolean use_neg_got_offsets_p; 4645 bfd_boolean allow_multigot_p; 4646 bfd_boolean local_gp_p; 4647 4648 switch (got_handling) 4649 { 4650 case 0: 4651 /* --got=single. */ 4652 local_gp_p = FALSE; 4653 use_neg_got_offsets_p = FALSE; 4654 allow_multigot_p = FALSE; 4655 break; 4656 4657 case 1: 4658 /* --got=negative. */ 4659 local_gp_p = TRUE; 4660 use_neg_got_offsets_p = TRUE; 4661 allow_multigot_p = FALSE; 4662 break; 4663 4664 case 2: 4665 /* --got=multigot. */ 4666 local_gp_p = TRUE; 4667 use_neg_got_offsets_p = TRUE; 4668 allow_multigot_p = TRUE; 4669 break; 4670 4671 default: 4672 BFD_ASSERT (FALSE); 4673 return; 4674 } 4675 4676 htab = elf_m68k_hash_table (info); 4677 if (htab != NULL) 4678 { 4679 htab->local_gp_p = local_gp_p; 4680 htab->use_neg_got_offsets_p = use_neg_got_offsets_p; 4681 htab->allow_multigot_p = allow_multigot_p; 4682 } 4683} 4684 4685static enum elf_reloc_type_class 4686elf32_m68k_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED, 4687 const asection *rel_sec ATTRIBUTE_UNUSED, 4688 const Elf_Internal_Rela *rela) 4689{ 4690 switch ((int) ELF32_R_TYPE (rela->r_info)) 4691 { 4692 case R_68K_RELATIVE: 4693 return reloc_class_relative; 4694 case R_68K_JMP_SLOT: 4695 return reloc_class_plt; 4696 case R_68K_COPY: 4697 return reloc_class_copy; 4698 default: 4699 return reloc_class_normal; 4700 } 4701} 4702 4703/* Return address for Ith PLT stub in section PLT, for relocation REL 4704 or (bfd_vma) -1 if it should not be included. */ 4705 4706static bfd_vma 4707elf_m68k_plt_sym_val (bfd_vma i, const asection *plt, 4708 const arelent *rel ATTRIBUTE_UNUSED) 4709{ 4710 return plt->vma + (i + 1) * elf_m68k_get_plt_info (plt->owner)->size; 4711} 4712 4713/* Support for core dump NOTE sections. */ 4714 4715static bfd_boolean 4716elf_m68k_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) 4717{ 4718 int offset; 4719 size_t size; 4720 4721 switch (note->descsz) 4722 { 4723 default: 4724 return FALSE; 4725 4726 case 154: /* Linux/m68k */ 4727 /* pr_cursig */ 4728 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12); 4729 4730 /* pr_pid */ 4731 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 22); 4732 4733 /* pr_reg */ 4734 offset = 70; 4735 size = 80; 4736 4737 break; 4738 } 4739 4740 /* Make a ".reg/999" section. */ 4741 return _bfd_elfcore_make_pseudosection (abfd, ".reg", 4742 size, note->descpos + offset); 4743} 4744 4745static bfd_boolean 4746elf_m68k_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) 4747{ 4748 switch (note->descsz) 4749 { 4750 default: 4751 return FALSE; 4752 4753 case 124: /* Linux/m68k elf_prpsinfo. */ 4754 elf_tdata (abfd)->core->pid 4755 = bfd_get_32 (abfd, note->descdata + 12); 4756 elf_tdata (abfd)->core->program 4757 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); 4758 elf_tdata (abfd)->core->command 4759 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); 4760 } 4761 4762 /* Note that for some reason, a spurious space is tacked 4763 onto the end of the args in some (at least one anyway) 4764 implementations, so strip it off if it exists. */ 4765 { 4766 char *command = elf_tdata (abfd)->core->command; 4767 int n = strlen (command); 4768 4769 if (n > 0 && command[n - 1] == ' ') 4770 command[n - 1] = '\0'; 4771 } 4772 4773 return TRUE; 4774} 4775 4776/* Hook called by the linker routine which adds symbols from an object 4777 file. */ 4778 4779static bfd_boolean 4780elf_m68k_add_symbol_hook (bfd *abfd, 4781 struct bfd_link_info *info, 4782 Elf_Internal_Sym *sym, 4783 const char **namep ATTRIBUTE_UNUSED, 4784 flagword *flagsp ATTRIBUTE_UNUSED, 4785 asection **secp ATTRIBUTE_UNUSED, 4786 bfd_vma *valp ATTRIBUTE_UNUSED) 4787{ 4788 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC 4789 && (abfd->flags & DYNAMIC) == 0 4790 && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour) 4791 elf_tdata (info->output_bfd)->has_gnu_symbols |= elf_gnu_symbol_ifunc; 4792 4793 return TRUE; 4794} 4795 4796#define TARGET_BIG_SYM m68k_elf32_vec 4797#define TARGET_BIG_NAME "elf32-m68k" 4798#define ELF_MACHINE_CODE EM_68K 4799#define ELF_MAXPAGESIZE 0x2000 4800#define elf_backend_create_dynamic_sections \ 4801 _bfd_elf_create_dynamic_sections 4802#define bfd_elf32_bfd_link_hash_table_create \ 4803 elf_m68k_link_hash_table_create 4804#define bfd_elf32_bfd_final_link bfd_elf_final_link 4805 4806#define elf_backend_check_relocs elf_m68k_check_relocs 4807#define elf_backend_always_size_sections \ 4808 elf_m68k_always_size_sections 4809#define elf_backend_adjust_dynamic_symbol \ 4810 elf_m68k_adjust_dynamic_symbol 4811#define elf_backend_size_dynamic_sections \ 4812 elf_m68k_size_dynamic_sections 4813#define elf_backend_final_write_processing elf_m68k_final_write_processing 4814#define elf_backend_init_index_section _bfd_elf_init_1_index_section 4815#define elf_backend_relocate_section elf_m68k_relocate_section 4816#define elf_backend_finish_dynamic_symbol \ 4817 elf_m68k_finish_dynamic_symbol 4818#define elf_backend_finish_dynamic_sections \ 4819 elf_m68k_finish_dynamic_sections 4820#define elf_backend_gc_mark_hook elf_m68k_gc_mark_hook 4821#define elf_backend_gc_sweep_hook elf_m68k_gc_sweep_hook 4822#define elf_backend_copy_indirect_symbol elf_m68k_copy_indirect_symbol 4823#define bfd_elf32_bfd_merge_private_bfd_data \ 4824 elf32_m68k_merge_private_bfd_data 4825#define bfd_elf32_bfd_set_private_flags \ 4826 elf32_m68k_set_private_flags 4827#define bfd_elf32_bfd_print_private_bfd_data \ 4828 elf32_m68k_print_private_bfd_data 4829#define elf_backend_reloc_type_class elf32_m68k_reloc_type_class 4830#define elf_backend_plt_sym_val elf_m68k_plt_sym_val 4831#define elf_backend_object_p elf32_m68k_object_p 4832#define elf_backend_grok_prstatus elf_m68k_grok_prstatus 4833#define elf_backend_grok_psinfo elf_m68k_grok_psinfo 4834#define elf_backend_add_symbol_hook elf_m68k_add_symbol_hook 4835 4836#define elf_backend_can_gc_sections 1 4837#define elf_backend_can_refcount 1 4838#define elf_backend_want_got_plt 1 4839#define elf_backend_plt_readonly 1 4840#define elf_backend_want_plt_sym 0 4841#define elf_backend_got_header_size 12 4842#define elf_backend_rela_normal 1 4843#define elf_backend_dtrel_excludes_plt 1 4844 4845#include "elf32-target.h" 4846