bfd/elf64-x86-64.c

   1 /* X86-64 specific support for 64-bit ELF
   2    Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
   3    2010  Free Software Foundation, Inc.
   4    Contributed by Jan Hubicka <jh@suse.cz>.
   5
   6    This file is part of BFD, the Binary File Descriptor library.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  21    MA 02110-1301, USA.  */
  22
  23 #include "sysdep.h"
  24 #include "bfd.h"
  25 #include "bfdlink.h"
  26 #include "libbfd.h"
  27 #include "elf-bfd.h"
  28 #include "bfd_stdint.h"
  29 #include "objalloc.h"
  30 #include "hashtab.h"
  31
  32 #include "elf/x86-64.h"
  33
  34 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value.  */
  35 #define MINUS_ONE (~ (bfd_vma) 0)
  36
  37 /* The relocation "howto" table.  Order of fields:
  38    type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
  39    special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset.  */
  40 static reloc_howto_type x86_64_elf_howto_table[] =
  41 {
  42   HOWTO(R_X86_64_NONE, 0, 0, 0, FALSE, 0, complain_overflow_dont,
  43         bfd_elf_generic_reloc, "R_X86_64_NONE", FALSE, 0x00000000, 0x00000000,
  44         FALSE),
  45   HOWTO(R_X86_64_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
  46         bfd_elf_generic_reloc, "R_X86_64_64", FALSE, MINUS_ONE, MINUS_ONE,
  47         FALSE),
  48   HOWTO(R_X86_64_PC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
  49         bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff,
  50         TRUE),
  51   HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
  52         bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff,
  53         FALSE),
  54   HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
  55         bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff,
  56         TRUE),
  57   HOWTO(R_X86_64_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
  58         bfd_elf_generic_reloc, "R_X86_64_COPY", FALSE, 0xffffffff, 0xffffffff,
  59         FALSE),
  60   HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
  61         bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", FALSE, MINUS_ONE,
  62         MINUS_ONE, FALSE),
  63   HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
  64         bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", FALSE, MINUS_ONE,
  65         MINUS_ONE, FALSE),
  66   HOWTO(R_X86_64_RELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
  67         bfd_elf_generic_reloc, "R_X86_64_RELATIVE", FALSE, MINUS_ONE,
  68         MINUS_ONE, FALSE),
  69   HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed,
  70         bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff,
  71         0xffffffff, TRUE),
  72   HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
  73         bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
  74         FALSE),
  75   HOWTO(R_X86_64_32S, 0, 2, 32, FALSE, 0, complain_overflow_signed,
  76         bfd_elf_generic_reloc, "R_X86_64_32S", FALSE, 0xffffffff, 0xffffffff,
  77         FALSE),
  78   HOWTO(R_X86_64_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
  79         bfd_elf_generic_reloc, "R_X86_64_16", FALSE, 0xffff, 0xffff, FALSE),
  80   HOWTO(R_X86_64_PC16,0, 1, 16, TRUE, 0, complain_overflow_bitfield,
  81         bfd_elf_generic_reloc, "R_X86_64_PC16", FALSE, 0xffff, 0xffff, TRUE),
  82   HOWTO(R_X86_64_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
  83         bfd_elf_generic_reloc, "R_X86_64_8", FALSE, 0xff, 0xff, FALSE),
  84   HOWTO(R_X86_64_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
  85         bfd_elf_generic_reloc, "R_X86_64_PC8", FALSE, 0xff, 0xff, TRUE),
  86   HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
  87         bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE,
  88         MINUS_ONE, FALSE),
  89   HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
  90         bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE,
  91         MINUS_ONE, FALSE),
  92   HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
  93         bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE,
  94         MINUS_ONE, FALSE),
  95   HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
  96         bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff,
  97         0xffffffff, TRUE),
  98   HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
  99         bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff,
 100         0xffffffff, TRUE),
 101   HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
 102         bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff,
 103         0xffffffff, FALSE),
 104   HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed,
 105         bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff,
 106         0xffffffff, TRUE),
 107   HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
 108         bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff,
 109         0xffffffff, FALSE),
 110   HOWTO(R_X86_64_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
 111         bfd_elf_generic_reloc, "R_X86_64_PC64", FALSE, MINUS_ONE, MINUS_ONE,
 112         TRUE),
 113   HOWTO(R_X86_64_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
 114         bfd_elf_generic_reloc, "R_X86_64_GOTOFF64",
 115         FALSE, MINUS_ONE, MINUS_ONE, FALSE),
 116   HOWTO(R_X86_64_GOTPC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
 117         bfd_elf_generic_reloc, "R_X86_64_GOTPC32",
 118         FALSE, 0xffffffff, 0xffffffff, TRUE),
 119   HOWTO(R_X86_64_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
 120         bfd_elf_generic_reloc, "R_X86_64_GOT64", FALSE, MINUS_ONE, MINUS_ONE,
 121         FALSE),
 122   HOWTO(R_X86_64_GOTPCREL64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
 123         bfd_elf_generic_reloc, "R_X86_64_GOTPCREL64", FALSE, MINUS_ONE,
 124         MINUS_ONE, TRUE),
 125   HOWTO(R_X86_64_GOTPC64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
 126         bfd_elf_generic_reloc, "R_X86_64_GOTPC64",
 127         FALSE, MINUS_ONE, MINUS_ONE, TRUE),
 128   HOWTO(R_X86_64_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
 129         bfd_elf_generic_reloc, "R_X86_64_GOTPLT64", FALSE, MINUS_ONE,
 130         MINUS_ONE, FALSE),
 131   HOWTO(R_X86_64_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
 132         bfd_elf_generic_reloc, "R_X86_64_PLTOFF64", FALSE, MINUS_ONE,
 133         MINUS_ONE, FALSE),
 134   EMPTY_HOWTO (32),
 135   EMPTY_HOWTO (33),
 136   HOWTO(R_X86_64_GOTPC32_TLSDESC, 0, 2, 32, TRUE, 0,
 137         complain_overflow_bitfield, bfd_elf_generic_reloc,
 138         "R_X86_64_GOTPC32_TLSDESC",
 139         FALSE, 0xffffffff, 0xffffffff, TRUE),
 140   HOWTO(R_X86_64_TLSDESC_CALL, 0, 0, 0, FALSE, 0,
 141         complain_overflow_dont, bfd_elf_generic_reloc,
 142         "R_X86_64_TLSDESC_CALL",
 143         FALSE, 0, 0, FALSE),
 144   HOWTO(R_X86_64_TLSDESC, 0, 4, 64, FALSE, 0,
 145         complain_overflow_bitfield, bfd_elf_generic_reloc,
 146         "R_X86_64_TLSDESC",
 147         FALSE, MINUS_ONE, MINUS_ONE, FALSE),
 148   HOWTO(R_X86_64_IRELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
 149         bfd_elf_generic_reloc, "R_X86_64_IRELATIVE", FALSE, MINUS_ONE,
 150         MINUS_ONE, FALSE),
 151
 152   /* We have a gap in the reloc numbers here.
 153      R_X86_64_standard counts the number up to this point, and
 154      R_X86_64_vt_offset is the value to subtract from a reloc type of
 155      R_X86_64_GNU_VT* to form an index into this table.  */
 156 #define R_X86_64_standard (R_X86_64_IRELATIVE + 1)
 157 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
 158
 159 /* GNU extension to record C++ vtable hierarchy.  */
 160   HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont,
 161          NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE),
 162
 163 /* GNU extension to record C++ vtable member usage.  */
 164   HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont,
 165          _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0,
 166          FALSE)
 167 };
 168
 169 #define IS_X86_64_PCREL_TYPE(TYPE)      \
 170   (   ((TYPE) == R_X86_64_PC8)          \
 171    || ((TYPE) == R_X86_64_PC16)         \
 172    || ((TYPE) == R_X86_64_PC32)         \
 173    || ((TYPE) == R_X86_64_PC64))
 174
 175 /* Map BFD relocs to the x86_64 elf relocs.  */
 176 struct elf_reloc_map
 177 {
 178   bfd_reloc_code_real_type bfd_reloc_val;
 179   unsigned char elf_reloc_val;
 180 };
 181
 182 static const struct elf_reloc_map x86_64_reloc_map[] =
 183 {
 184   { BFD_RELOC_NONE,             R_X86_64_NONE, },
 185   { BFD_RELOC_64,               R_X86_64_64,   },
 186   { BFD_RELOC_32_PCREL,         R_X86_64_PC32, },
 187   { BFD_RELOC_X86_64_GOT32,     R_X86_64_GOT32,},
 188   { BFD_RELOC_X86_64_PLT32,     R_X86_64_PLT32,},
 189   { BFD_RELOC_X86_64_COPY,      R_X86_64_COPY, },
 190   { BFD_RELOC_X86_64_GLOB_DAT,  R_X86_64_GLOB_DAT, },
 191   { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, },
 192   { BFD_RELOC_X86_64_RELATIVE,  R_X86_64_RELATIVE, },
 193   { BFD_RELOC_X86_64_GOTPCREL,  R_X86_64_GOTPCREL, },
 194   { BFD_RELOC_32,               R_X86_64_32, },
 195   { BFD_RELOC_X86_64_32S,       R_X86_64_32S, },
 196   { BFD_RELOC_16,               R_X86_64_16, },
 197   { BFD_RELOC_16_PCREL,         R_X86_64_PC16, },
 198   { BFD_RELOC_8,                R_X86_64_8, },
 199   { BFD_RELOC_8_PCREL,          R_X86_64_PC8, },
 200   { BFD_RELOC_X86_64_DTPMOD64,  R_X86_64_DTPMOD64, },
 201   { BFD_RELOC_X86_64_DTPOFF64,  R_X86_64_DTPOFF64, },
 202   { BFD_RELOC_X86_64_TPOFF64,   R_X86_64_TPOFF64, },
 203   { BFD_RELOC_X86_64_TLSGD,     R_X86_64_TLSGD, },
 204   { BFD_RELOC_X86_64_TLSLD,     R_X86_64_TLSLD, },
 205   { BFD_RELOC_X86_64_DTPOFF32,  R_X86_64_DTPOFF32, },
 206   { BFD_RELOC_X86_64_GOTTPOFF,  R_X86_64_GOTTPOFF, },
 207   { BFD_RELOC_X86_64_TPOFF32,   R_X86_64_TPOFF32, },
 208   { BFD_RELOC_64_PCREL,         R_X86_64_PC64, },
 209   { BFD_RELOC_X86_64_GOTOFF64,  R_X86_64_GOTOFF64, },
 210   { BFD_RELOC_X86_64_GOTPC32,   R_X86_64_GOTPC32, },
 211   { BFD_RELOC_X86_64_GOT64,     R_X86_64_GOT64, },
 212   { BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, },
 213   { BFD_RELOC_X86_64_GOTPC64,   R_X86_64_GOTPC64, },
 214   { BFD_RELOC_X86_64_GOTPLT64,  R_X86_64_GOTPLT64, },
 215   { BFD_RELOC_X86_64_PLTOFF64,  R_X86_64_PLTOFF64, },
 216   { BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, },
 217   { BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, },
 218   { BFD_RELOC_X86_64_TLSDESC,   R_X86_64_TLSDESC, },
 219   { BFD_RELOC_X86_64_IRELATIVE, R_X86_64_IRELATIVE, },
 220   { BFD_RELOC_VTABLE_INHERIT,   R_X86_64_GNU_VTINHERIT, },
 221   { BFD_RELOC_VTABLE_ENTRY,     R_X86_64_GNU_VTENTRY, },
 222 };
 223
 224 static reloc_howto_type *
 225 elf64_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type)
 226 {
 227   unsigned i;
 228
 229   if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT
 230       || r_type >= (unsigned int) R_X86_64_max)
 231     {
 232       if (r_type >= (unsigned int) R_X86_64_standard)
 233         {
 234           (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
 235                                  abfd, (int) r_type);
 236           r_type = R_X86_64_NONE;
 237         }
 238       i = r_type;
 239     }
 240   else
 241     i = r_type - (unsigned int) R_X86_64_vt_offset;
 242   BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type);
 243   return &x86_64_elf_howto_table[i];
 244 }
 245
 246 /* Given a BFD reloc type, return a HOWTO structure.  */
 247 static reloc_howto_type *
 248 elf64_x86_64_reloc_type_lookup (bfd *abfd,
 249                                 bfd_reloc_code_real_type code)
 250 {
 251   unsigned int i;
 252
 253   for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map);
 254        i++)
 255     {
 256       if (x86_64_reloc_map[i].bfd_reloc_val == code)
 257         return elf64_x86_64_rtype_to_howto (abfd,
 258                                             x86_64_reloc_map[i].elf_reloc_val);
 259     }
 260   return 0;
 261 }
 262
 263 static reloc_howto_type *
 264 elf64_x86_64_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 265                                 const char *r_name)
 266 {
 267   unsigned int i;
 268
 269   for (i = 0;
 270        i < (sizeof (x86_64_elf_howto_table)
 271             / sizeof (x86_64_elf_howto_table[0]));
 272        i++)
 273     if (x86_64_elf_howto_table[i].name != NULL
 274         && strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0)
 275       return &x86_64_elf_howto_table[i];
 276
 277   return NULL;
 278 }
 279
 280 /* Given an x86_64 ELF reloc type, fill in an arelent structure.  */
 281
 282 static void
 283 elf64_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
 284                             Elf_Internal_Rela *dst)
 285 {
 286   unsigned r_type;
 287
 288   r_type = ELF64_R_TYPE (dst->r_info);
 289   cache_ptr->howto = elf64_x86_64_rtype_to_howto (abfd, r_type);
 290   BFD_ASSERT (r_type == cache_ptr->howto->type);
 291 }
 292 \f
 293 /* Support for core dump NOTE sections.  */
 294 static bfd_boolean
 295 elf64_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
 296 {
 297   int offset;
 298   size_t size;
 299
 300   switch (note->descsz)
 301     {
 302       default:
 303         return FALSE;
 304
 305       case 336:         /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
 306         /* pr_cursig */
 307         elf_tdata (abfd)->core_signal
 308           = bfd_get_16 (abfd, note->descdata + 12);
 309
 310         /* pr_pid */
 311         elf_tdata (abfd)->core_pid
 312           = bfd_get_32 (abfd, note->descdata + 32);
 313
 314         /* pr_reg */
 315         offset = 112;
 316         size = 216;
 317
 318         break;
 319     }
 320
 321   /* Make a ".reg/999" section.  */
 322   return _bfd_elfcore_make_pseudosection (abfd, ".reg",
 323                                           size, note->descpos + offset);
 324 }
 325
 326 static bfd_boolean
 327 elf64_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
 328 {
 329   switch (note->descsz)
 330     {
 331       default:
 332         return FALSE;
 333
 334       case 136:         /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
 335         elf_tdata (abfd)->core_program
 336          = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
 337         elf_tdata (abfd)->core_command
 338          = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
 339     }
 340
 341   /* Note that for some reason, a spurious space is tacked
 342      onto the end of the args in some (at least one anyway)
 343      implementations, so strip it off if it exists.  */
 344
 345   {
 346     char *command = elf_tdata (abfd)->core_command;
 347     int n = strlen (command);
 348
 349     if (0 < n && command[n - 1] == ' ')
 350       command[n - 1] = '\0';
 351   }
 352
 353   return TRUE;
 354 }
 355 \f
 356 /* Functions for the x86-64 ELF linker.  */
 357
 358 /* The name of the dynamic interpreter.  This is put in the .interp
 359    section.  */
 360
 361 #define ELF_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
 362
 363 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
 364    copying dynamic variables from a shared lib into an app's dynbss
 365    section, and instead use a dynamic relocation to point into the
 366    shared lib.  */
 367 #define ELIMINATE_COPY_RELOCS 1
 368
 369 /* The size in bytes of an entry in the global offset table.  */
 370
 371 #define GOT_ENTRY_SIZE 8
 372
 373 /* The size in bytes of an entry in the procedure linkage table.  */
 374
 375 #define PLT_ENTRY_SIZE 16
 376
 377 /* The first entry in a procedure linkage table looks like this.  See the
 378    SVR4 ABI i386 supplement and the x86-64 ABI to see how this works.  */
 379
 380 static const bfd_byte elf64_x86_64_plt0_entry[PLT_ENTRY_SIZE] =
 381 {
 382   0xff, 0x35, 8, 0, 0, 0,       /* pushq GOT+8(%rip)  */
 383   0xff, 0x25, 16, 0, 0, 0,      /* jmpq *GOT+16(%rip) */
 384   0x0f, 0x1f, 0x40, 0x00        /* nopl 0(%rax)       */
 385 };
 386
 387 /* Subsequent entries in a procedure linkage table look like this.  */
 388
 389 static const bfd_byte elf64_x86_64_plt_entry[PLT_ENTRY_SIZE] =
 390 {
 391   0xff, 0x25,   /* jmpq *name@GOTPC(%rip) */
 392   0, 0, 0, 0,   /* replaced with offset to this symbol in .got.  */
 393   0x68,         /* pushq immediate */
 394   0, 0, 0, 0,   /* replaced with index into relocation table.  */
 395   0xe9,         /* jmp relative */
 396   0, 0, 0, 0    /* replaced with offset to start of .plt0.  */
 397 };
 398
 399 /* x86-64 ELF linker hash entry.  */
 400
 401 struct elf64_x86_64_link_hash_entry
 402 {
 403   struct elf_link_hash_entry elf;
 404
 405   /* Track dynamic relocs copied for this symbol.  */
 406   struct elf_dyn_relocs *dyn_relocs;
 407
 408 #define GOT_UNKNOWN     0
 409 #define GOT_NORMAL      1
 410 #define GOT_TLS_GD      2
 411 #define GOT_TLS_IE      3
 412 #define GOT_TLS_GDESC   4
 413 #define GOT_TLS_GD_BOTH_P(type) \
 414   ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
 415 #define GOT_TLS_GD_P(type) \
 416   ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
 417 #define GOT_TLS_GDESC_P(type) \
 418   ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
 419 #define GOT_TLS_GD_ANY_P(type) \
 420   (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
 421   unsigned char tls_type;
 422
 423   /* Offset of the GOTPLT entry reserved for the TLS descriptor,
 424      starting at the end of the jump table.  */
 425   bfd_vma tlsdesc_got;
 426 };
 427
 428 #define elf64_x86_64_hash_entry(ent) \
 429   ((struct elf64_x86_64_link_hash_entry *)(ent))
 430
 431 struct elf64_x86_64_obj_tdata
 432 {
 433   struct elf_obj_tdata root;
 434
 435   /* tls_type for each local got entry.  */
 436   char *local_got_tls_type;
 437
 438   /* GOTPLT entries for TLS descriptors.  */
 439   bfd_vma *local_tlsdesc_gotent;
 440 };
 441
 442 #define elf64_x86_64_tdata(abfd) \
 443   ((struct elf64_x86_64_obj_tdata *) (abfd)->tdata.any)
 444
 445 #define elf64_x86_64_local_got_tls_type(abfd) \
 446   (elf64_x86_64_tdata (abfd)->local_got_tls_type)
 447
 448 #define elf64_x86_64_local_tlsdesc_gotent(abfd) \
 449   (elf64_x86_64_tdata (abfd)->local_tlsdesc_gotent)
 450
 451 #define is_x86_64_elf(bfd)                              \
 452   (bfd_get_flavour (bfd) == bfd_target_elf_flavour      \
 453    && elf_tdata (bfd) != NULL                           \
 454    && elf_object_id (bfd) == X86_64_ELF_DATA)
 455
 456 static bfd_boolean
 457 elf64_x86_64_mkobject (bfd *abfd)
 458 {
 459   return bfd_elf_allocate_object (abfd, sizeof (struct elf64_x86_64_obj_tdata),
 460                                   X86_64_ELF_DATA);
 461 }
 462
 463 /* x86-64 ELF linker hash table.  */
 464
 465 struct elf64_x86_64_link_hash_table
 466 {
 467   struct elf_link_hash_table elf;
 468
 469   /* Short-cuts to get to dynamic linker sections.  */
 470   asection *sdynbss;
 471   asection *srelbss;
 472
 473   union
 474   {
 475     bfd_signed_vma refcount;
 476     bfd_vma offset;
 477   } tls_ld_got;
 478
 479   /* The amount of space used by the jump slots in the GOT.  */
 480   bfd_vma sgotplt_jump_table_size;
 481
 482   /* Small local sym cache.  */
 483   struct sym_cache sym_cache;
 484
 485   /* _TLS_MODULE_BASE_ symbol.  */
 486   struct bfd_link_hash_entry *tls_module_base;
 487
 488   /* Used by local STT_GNU_IFUNC symbols.  */
 489   htab_t loc_hash_table;
 490   void * loc_hash_memory;
 491
 492   /* The offset into splt of the PLT entry for the TLS descriptor
 493      resolver.  Special values are 0, if not necessary (or not found
 494      to be necessary yet), and -1 if needed but not determined
 495      yet.  */
 496   bfd_vma tlsdesc_plt;
 497   /* The offset into sgot of the GOT entry used by the PLT entry
 498      above.  */
 499   bfd_vma tlsdesc_got;
 500 };
 501
 502 /* Get the x86-64 ELF linker hash table from a link_info structure.  */
 503
 504 #define elf64_x86_64_hash_table(p) \
 505   (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
 506   == X86_64_ELF_DATA ? ((struct elf64_x86_64_link_hash_table *) ((p)->hash)) : NULL)
 507
 508 #define elf64_x86_64_compute_jump_table_size(htab) \
 509   ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
 510
 511 /* Create an entry in an x86-64 ELF linker hash table.  */
 512
 513 static struct bfd_hash_entry *
 514 elf64_x86_64_link_hash_newfunc (struct bfd_hash_entry *entry,
 515                                 struct bfd_hash_table *table,
 516                                 const char *string)
 517 {
 518   /* Allocate the structure if it has not already been allocated by a
 519      subclass.  */
 520   if (entry == NULL)
 521     {
 522       entry = (struct bfd_hash_entry *)
 523           bfd_hash_allocate (table,
 524                              sizeof (struct elf64_x86_64_link_hash_entry));
 525       if (entry == NULL)
 526         return entry;
 527     }
 528
 529   /* Call the allocation method of the superclass.  */
 530   entry = _bfd_elf_link_hash_newfunc (entry, table, string);
 531   if (entry != NULL)
 532     {
 533       struct elf64_x86_64_link_hash_entry *eh;
 534
 535       eh = (struct elf64_x86_64_link_hash_entry *) entry;
 536       eh->dyn_relocs = NULL;
 537       eh->tls_type = GOT_UNKNOWN;
 538       eh->tlsdesc_got = (bfd_vma) -1;
 539     }
 540
 541   return entry;
 542 }
 543
 544 /* Compute a hash of a local hash entry.  We use elf_link_hash_entry
 545   for local symbol so that we can handle local STT_GNU_IFUNC symbols
 546   as global symbol.  We reuse indx and dynstr_index for local symbol
 547   hash since they aren't used by global symbols in this backend.  */
 548
 549 static hashval_t
 550 elf64_x86_64_local_htab_hash (const void *ptr)
 551 {
 552   struct elf_link_hash_entry *h
 553     = (struct elf_link_hash_entry *) ptr;
 554   return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
 555 }
 556
 557 /* Compare local hash entries.  */
 558
 559 static int
 560 elf64_x86_64_local_htab_eq (const void *ptr1, const void *ptr2)
 561 {
 562   struct elf_link_hash_entry *h1
 563      = (struct elf_link_hash_entry *) ptr1;
 564   struct elf_link_hash_entry *h2
 565     = (struct elf_link_hash_entry *) ptr2;
 566
 567   return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
 568 }
 569
 570 /* Find and/or create a hash entry for local symbol.  */
 571
 572 static struct elf_link_hash_entry *
 573 elf64_x86_64_get_local_sym_hash (struct elf64_x86_64_link_hash_table *htab,
 574                                  bfd *abfd, const Elf_Internal_Rela *rel,
 575                                  bfd_boolean create)
 576 {
 577   struct elf64_x86_64_link_hash_entry e, *ret;
 578   asection *sec = abfd->sections;
 579   hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
 580                                        ELF64_R_SYM (rel->r_info));
 581   void **slot;
 582
 583   e.elf.indx = sec->id;
 584   e.elf.dynstr_index = ELF64_R_SYM (rel->r_info);
 585   slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
 586                                    create ? INSERT : NO_INSERT);
 587
 588   if (!slot)
 589     return NULL;
 590
 591   if (*slot)
 592     {
 593       ret = (struct elf64_x86_64_link_hash_entry *) *slot;
 594       return &ret->elf;
 595     }
 596
 597   ret = (struct elf64_x86_64_link_hash_entry *)
 598         objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
 599                         sizeof (struct elf64_x86_64_link_hash_entry));
 600   if (ret)
 601     {
 602       memset (ret, 0, sizeof (*ret));
 603       ret->elf.indx = sec->id;
 604       ret->elf.dynstr_index = ELF64_R_SYM (rel->r_info);
 605       ret->elf.dynindx = -1;
 606       ret->elf.plt.offset = (bfd_vma) -1;
 607       ret->elf.got.offset = (bfd_vma) -1;
 608       *slot = ret;
 609     }
 610   return &ret->elf;
 611 }
 612
 613 /* Create an X86-64 ELF linker hash table.  */
 614
 615 static struct bfd_link_hash_table *
 616 elf64_x86_64_link_hash_table_create (bfd *abfd)
 617 {
 618   struct elf64_x86_64_link_hash_table *ret;
 619   bfd_size_type amt = sizeof (struct elf64_x86_64_link_hash_table);
 620
 621   ret = (struct elf64_x86_64_link_hash_table *) bfd_malloc (amt);
 622   if (ret == NULL)
 623     return NULL;
 624
 625   if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
 626                                       elf64_x86_64_link_hash_newfunc,
 627                                       sizeof (struct elf64_x86_64_link_hash_entry),
 628                                       X86_64_ELF_DATA))
 629     {
 630       free (ret);
 631       return NULL;
 632     }
 633
 634   ret->sdynbss = NULL;
 635   ret->srelbss = NULL;
 636   ret->sym_cache.abfd = NULL;
 637   ret->tlsdesc_plt = 0;
 638   ret->tlsdesc_got = 0;
 639   ret->tls_ld_got.refcount = 0;
 640   ret->sgotplt_jump_table_size = 0;
 641   ret->tls_module_base = NULL;
 642
 643   ret->loc_hash_table = htab_try_create (1024,
 644                                          elf64_x86_64_local_htab_hash,
 645                                          elf64_x86_64_local_htab_eq,
 646                                          NULL);
 647   ret->loc_hash_memory = objalloc_create ();
 648   if (!ret->loc_hash_table || !ret->loc_hash_memory)
 649     {
 650       free (ret);
 651       return NULL;
 652     }
 653
 654   return &ret->elf.root;
 655 }
 656
 657 /* Destroy an X86-64 ELF linker hash table.  */
 658
 659 static void
 660 elf64_x86_64_link_hash_table_free (struct bfd_link_hash_table *hash)
 661 {
 662   struct elf64_x86_64_link_hash_table *htab
 663     = (struct elf64_x86_64_link_hash_table *) hash;
 664
 665   if (htab->loc_hash_table)
 666     htab_delete (htab->loc_hash_table);
 667   if (htab->loc_hash_memory)
 668     objalloc_free ((struct objalloc *) htab->loc_hash_memory);
 669   _bfd_generic_link_hash_table_free (hash);
 670 }
 671
 672 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
 673    .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
 674    hash table.  */
 675
 676 static bfd_boolean
 677 elf64_x86_64_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
 678 {
 679   struct elf64_x86_64_link_hash_table *htab;
 680
 681   if (!_bfd_elf_create_dynamic_sections (dynobj, info))
 682     return FALSE;
 683
 684   htab = elf64_x86_64_hash_table (info);
 685   if (htab == NULL)
 686     return FALSE;
 687
 688   htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
 689   if (!info->shared)
 690     htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
 691
 692   if (!htab->sdynbss
 693       || (!info->shared && !htab->srelbss))
 694     abort ();
 695
 696   return TRUE;
 697 }
 698
 699 /* Copy the extra info we tack onto an elf_link_hash_entry.  */
 700
 701 static void
 702 elf64_x86_64_copy_indirect_symbol (struct bfd_link_info *info,
 703                                    struct elf_link_hash_entry *dir,
 704                                    struct elf_link_hash_entry *ind)
 705 {
 706   struct elf64_x86_64_link_hash_entry *edir, *eind;
 707
 708   edir = (struct elf64_x86_64_link_hash_entry *) dir;
 709   eind = (struct elf64_x86_64_link_hash_entry *) ind;
 710
 711   if (eind->dyn_relocs != NULL)
 712     {
 713       if (edir->dyn_relocs != NULL)
 714         {
 715           struct elf_dyn_relocs **pp;
 716           struct elf_dyn_relocs *p;
 717
 718           /* Add reloc counts against the indirect sym to the direct sym
 719              list.  Merge any entries against the same section.  */
 720           for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
 721             {
 722               struct elf_dyn_relocs *q;
 723
 724               for (q = edir->dyn_relocs; q != NULL; q = q->next)
 725                 if (q->sec == p->sec)
 726                   {
 727                     q->pc_count += p->pc_count;
 728                     q->count += p->count;
 729                     *pp = p->next;
 730                     break;
 731                   }
 732               if (q == NULL)
 733                 pp = &p->next;
 734             }
 735           *pp = edir->dyn_relocs;
 736         }
 737
 738       edir->dyn_relocs = eind->dyn_relocs;
 739       eind->dyn_relocs = NULL;
 740     }
 741
 742   if (ind->root.type == bfd_link_hash_indirect
 743       && dir->got.refcount <= 0)
 744     {
 745       edir->tls_type = eind->tls_type;
 746       eind->tls_type = GOT_UNKNOWN;
 747     }
 748
 749   if (ELIMINATE_COPY_RELOCS
 750       && ind->root.type != bfd_link_hash_indirect
 751       && dir->dynamic_adjusted)
 752     {
 753       /* If called to transfer flags for a weakdef during processing
 754          of elf_adjust_dynamic_symbol, don't copy non_got_ref.
 755          We clear it ourselves for ELIMINATE_COPY_RELOCS.  */
 756       dir->ref_dynamic |= ind->ref_dynamic;
 757       dir->ref_regular |= ind->ref_regular;
 758       dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
 759       dir->needs_plt |= ind->needs_plt;
 760       dir->pointer_equality_needed |= ind->pointer_equality_needed;
 761     }
 762   else
 763     _bfd_elf_link_hash_copy_indirect (info, dir, ind);
 764 }
 765
 766 static bfd_boolean
 767 elf64_x86_64_elf_object_p (bfd *abfd)
 768 {
 769   /* Set the right machine number for an x86-64 elf64 file.  */
 770   bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
 771   return TRUE;
 772 }
 773
 774 typedef union
 775   {
 776     unsigned char c[2];
 777     uint16_t i;
 778   }
 779 x86_64_opcode16;
 780
 781 typedef union
 782   {
 783     unsigned char c[4];
 784     uint32_t i;
 785   }
 786 x86_64_opcode32;
 787
 788 /* Return TRUE if the TLS access code sequence support transition
 789    from R_TYPE.  */
 790
 791 static bfd_boolean
 792 elf64_x86_64_check_tls_transition (bfd *abfd, asection *sec,
 793                                    bfd_byte *contents,
 794                                    Elf_Internal_Shdr *symtab_hdr,
 795                                    struct elf_link_hash_entry **sym_hashes,
 796                                    unsigned int r_type,
 797                                    const Elf_Internal_Rela *rel,
 798                                    const Elf_Internal_Rela *relend)
 799 {
 800   unsigned int val;
 801   unsigned long r_symndx;
 802   struct elf_link_hash_entry *h;
 803   bfd_vma offset;
 804
 805   /* Get the section contents.  */
 806   if (contents == NULL)
 807     {
 808       if (elf_section_data (sec)->this_hdr.contents != NULL)
 809         contents = elf_section_data (sec)->this_hdr.contents;
 810       else
 811         {
 812           /* FIXME: How to better handle error condition?  */
 813           if (!bfd_malloc_and_get_section (abfd, sec, &contents))
 814             return FALSE;
 815
 816           /* Cache the section contents for elf_link_input_bfd.  */
 817           elf_section_data (sec)->this_hdr.contents = contents;
 818         }
 819     }
 820
 821   offset = rel->r_offset;
 822   switch (r_type)
 823     {
 824     case R_X86_64_TLSGD:
 825     case R_X86_64_TLSLD:
 826       if ((rel + 1) >= relend)
 827         return FALSE;
 828
 829       if (r_type == R_X86_64_TLSGD)
 830         {
 831           /* Check transition from GD access model.  Only
 832                 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
 833                 .word 0x6666; rex64; call __tls_get_addr
 834              can transit to different access model.  */
 835
 836           static x86_64_opcode32 leaq = { { 0x66, 0x48, 0x8d, 0x3d } },
 837                                  call = { { 0x66, 0x66, 0x48, 0xe8 } };
 838           if (offset < 4
 839               || (offset + 12) > sec->size
 840               || bfd_get_32 (abfd, contents + offset - 4) != leaq.i
 841               || bfd_get_32 (abfd, contents + offset + 4) != call.i)
 842             return FALSE;
 843         }
 844       else
 845         {
 846           /* Check transition from LD access model.  Only
 847                 leaq foo@tlsld(%rip), %rdi;
 848                 call __tls_get_addr
 849              can transit to different access model.  */
 850
 851           static x86_64_opcode32 ld = { { 0x48, 0x8d, 0x3d, 0xe8 } };
 852           x86_64_opcode32 op;
 853
 854           if (offset < 3 || (offset + 9) > sec->size)
 855             return FALSE;
 856
 857           op.i = bfd_get_32 (abfd, contents + offset - 3);
 858           op.c[3] = bfd_get_8 (abfd, contents + offset + 4);
 859           if (op.i != ld.i)
 860             return FALSE;
 861         }
 862
 863       r_symndx = ELF64_R_SYM (rel[1].r_info);
 864       if (r_symndx < symtab_hdr->sh_info)
 865         return FALSE;
 866
 867       h = sym_hashes[r_symndx - symtab_hdr->sh_info];
 868       /* Use strncmp to check __tls_get_addr since __tls_get_addr
 869          may be versioned.  */
 870       return (h != NULL
 871               && h->root.root.string != NULL
 872               && (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PC32
 873                   || ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32)
 874               && (strncmp (h->root.root.string,
 875                            "__tls_get_addr", 14) == 0));
 876
 877     case R_X86_64_GOTTPOFF:
 878       /* Check transition from IE access model:
 879                 movq foo@gottpoff(%rip), %reg
 880                 addq foo@gottpoff(%rip), %reg
 881        */
 882
 883       if (offset < 3 || (offset + 4) > sec->size)
 884         return FALSE;
 885
 886       val = bfd_get_8 (abfd, contents + offset - 3);
 887       if (val != 0x48 && val != 0x4c)
 888         return FALSE;
 889
 890       val = bfd_get_8 (abfd, contents + offset - 2);
 891       if (val != 0x8b && val != 0x03)
 892         return FALSE;
 893
 894       val = bfd_get_8 (abfd, contents + offset - 1);
 895       return (val & 0xc7) == 5;
 896
 897     case R_X86_64_GOTPC32_TLSDESC:
 898       /* Check transition from GDesc access model:
 899                 leaq x@tlsdesc(%rip), %rax
 900
 901          Make sure it's a leaq adding rip to a 32-bit offset
 902          into any register, although it's probably almost always
 903          going to be rax.  */
 904
 905       if (offset < 3 || (offset + 4) > sec->size)
 906         return FALSE;
 907
 908       val = bfd_get_8 (abfd, contents + offset - 3);
 909       if ((val & 0xfb) != 0x48)
 910         return FALSE;
 911
 912       if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
 913         return FALSE;
 914
 915       val = bfd_get_8 (abfd, contents + offset - 1);
 916       return (val & 0xc7) == 0x05;
 917
 918     case R_X86_64_TLSDESC_CALL:
 919       /* Check transition from GDesc access model:
 920                 call *x@tlsdesc(%rax)
 921        */
 922       if (offset + 2 <= sec->size)
 923         {
 924           /* Make sure that it's a call *x@tlsdesc(%rax).  */
 925           static x86_64_opcode16 call = { { 0xff, 0x10 } };
 926           return bfd_get_16 (abfd, contents + offset) == call.i;
 927         }
 928
 929       return FALSE;
 930
 931     default:
 932       abort ();
 933     }
 934 }
 935
 936 /* Return TRUE if the TLS access transition is OK or no transition
 937    will be performed.  Update R_TYPE if there is a transition.  */
 938
 939 static bfd_boolean
 940 elf64_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd,
 941                              asection *sec, bfd_byte *contents,
 942                              Elf_Internal_Shdr *symtab_hdr,
 943                              struct elf_link_hash_entry **sym_hashes,
 944                              unsigned int *r_type, int tls_type,
 945                              const Elf_Internal_Rela *rel,
 946                              const Elf_Internal_Rela *relend,
 947                              struct elf_link_hash_entry *h,
 948                              unsigned long r_symndx)
 949 {
 950   unsigned int from_type = *r_type;
 951   unsigned int to_type = from_type;
 952   bfd_boolean check = TRUE;
 953
 954   switch (from_type)
 955     {
 956     case R_X86_64_TLSGD:
 957     case R_X86_64_GOTPC32_TLSDESC:
 958     case R_X86_64_TLSDESC_CALL:
 959     case R_X86_64_GOTTPOFF:
 960       if (info->executable)
 961         {
 962           if (h == NULL)
 963             to_type = R_X86_64_TPOFF32;
 964           else
 965             to_type = R_X86_64_GOTTPOFF;
 966         }
 967
 968       /* When we are called from elf64_x86_64_relocate_section,
 969          CONTENTS isn't NULL and there may be additional transitions
 970          based on TLS_TYPE.  */
 971       if (contents != NULL)
 972         {
 973           unsigned int new_to_type = to_type;
 974
 975           if (info->executable
 976               && h != NULL
 977               && h->dynindx == -1
 978               && tls_type == GOT_TLS_IE)
 979             new_to_type = R_X86_64_TPOFF32;
 980
 981           if (to_type == R_X86_64_TLSGD
 982               || to_type == R_X86_64_GOTPC32_TLSDESC
 983               || to_type == R_X86_64_TLSDESC_CALL)
 984             {
 985               if (tls_type == GOT_TLS_IE)
 986                 new_to_type = R_X86_64_GOTTPOFF;
 987             }
 988
 989           /* We checked the transition before when we were called from
 990              elf64_x86_64_check_relocs.  We only want to check the new
 991              transition which hasn't been checked before.  */
 992           check = new_to_type != to_type && from_type == to_type;
 993           to_type = new_to_type;
 994         }
 995
 996       break;
 997
 998     case R_X86_64_TLSLD:
 999       if (info->executable)
1000         to_type = R_X86_64_TPOFF32;
1001       break;
1002
1003     default:
1004       return TRUE;
1005     }
1006
1007   /* Return TRUE if there is no transition.  */
1008   if (from_type == to_type)
1009     return TRUE;
1010
1011   /* Check if the transition can be performed.  */
1012   if (check
1013       && ! elf64_x86_64_check_tls_transition (abfd, sec, contents,
1014                                               symtab_hdr, sym_hashes,
1015                                               from_type, rel, relend))
1016     {
1017       reloc_howto_type *from, *to;
1018       const char *name;
1019
1020       from = elf64_x86_64_rtype_to_howto (abfd, from_type);
1021       to = elf64_x86_64_rtype_to_howto (abfd, to_type);
1022
1023       if (h)
1024         name = h->root.root.string;
1025       else
1026         {
1027           struct elf64_x86_64_link_hash_table *htab;
1028
1029           htab = elf64_x86_64_hash_table (info);
1030           if (htab == NULL)
1031             name = "*unknown*";
1032           else
1033             {
1034               Elf_Internal_Sym *isym;
1035
1036               isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1037                                             abfd, r_symndx);
1038               name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1039             }
1040         }
1041
1042       (*_bfd_error_handler)
1043         (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1044            "in section `%A' failed"),
1045          abfd, sec, from->name, to->name, name,
1046          (unsigned long) rel->r_offset);
1047       bfd_set_error (bfd_error_bad_value);
1048       return FALSE;
1049     }
1050
1051   *r_type = to_type;
1052   return TRUE;
1053 }
1054
1055 /* Look through the relocs for a section during the first phase, and
1056    calculate needed space in the global offset table, procedure
1057    linkage table, and dynamic reloc sections.  */
1058
1059 static bfd_boolean
1060 elf64_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
1061                            asection *sec,
1062                            const Elf_Internal_Rela *relocs)
1063 {
1064   struct elf64_x86_64_link_hash_table *htab;
1065   Elf_Internal_Shdr *symtab_hdr;
1066   struct elf_link_hash_entry **sym_hashes;
1067   const Elf_Internal_Rela *rel;
1068   const Elf_Internal_Rela *rel_end;
1069   asection *sreloc;
1070
1071   if (info->relocatable)
1072     return TRUE;
1073
1074   BFD_ASSERT (is_x86_64_elf (abfd));
1075
1076   htab = elf64_x86_64_hash_table (info);
1077   if (htab == NULL)
1078     return FALSE;
1079
1080   symtab_hdr = &elf_symtab_hdr (abfd);
1081   sym_hashes = elf_sym_hashes (abfd);
1082
1083   sreloc = NULL;
1084
1085   rel_end = relocs + sec->reloc_count;
1086   for (rel = relocs; rel < rel_end; rel++)
1087     {
1088       unsigned int r_type;
1089       unsigned long r_symndx;
1090       struct elf_link_hash_entry *h;
1091       Elf_Internal_Sym *isym;
1092       const char *name;
1093
1094       r_symndx = ELF64_R_SYM (rel->r_info);
1095       r_type = ELF64_R_TYPE (rel->r_info);
1096
1097       if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1098         {
1099           (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1100                                  abfd, r_symndx);
1101           return FALSE;
1102         }
1103
1104       if (r_symndx < symtab_hdr->sh_info)
1105         {
1106           /* A local symbol.  */
1107           isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1108                                         abfd, r_symndx);
1109           if (isym == NULL)
1110             return FALSE;
1111
1112           /* Check relocation against local STT_GNU_IFUNC symbol.  */
1113           if (ELF64_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1114             {
1115               h = elf64_x86_64_get_local_sym_hash (htab, abfd, rel,
1116                                                    TRUE);
1117               if (h == NULL)
1118                 return FALSE;
1119
1120               /* Fake a STT_GNU_IFUNC symbol.  */
1121               h->type = STT_GNU_IFUNC;
1122               h->def_regular = 1;
1123               h->ref_regular = 1;
1124               h->forced_local = 1;
1125               h->root.type = bfd_link_hash_defined;
1126             }
1127           else
1128             h = NULL;
1129         }
1130       else
1131         {
1132           isym = NULL;
1133           h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1134           while (h->root.type == bfd_link_hash_indirect
1135                  || h->root.type == bfd_link_hash_warning)
1136             h = (struct elf_link_hash_entry *) h->root.u.i.link;
1137         }
1138
1139       if (h != NULL)
1140         {
1141           /* Create the ifunc sections for static executables.  If we
1142              never see an indirect function symbol nor we are building
1143              a static executable, those sections will be empty and
1144              won't appear in output.  */
1145           switch (r_type)
1146             {
1147             default:
1148               break;
1149
1150             case R_X86_64_32S:
1151             case R_X86_64_32:
1152             case R_X86_64_64:
1153             case R_X86_64_PC32:
1154             case R_X86_64_PC64:
1155             case R_X86_64_PLT32:
1156             case R_X86_64_GOTPCREL:
1157             case R_X86_64_GOTPCREL64:
1158               if (!_bfd_elf_create_ifunc_sections (abfd, info))
1159                 return FALSE;
1160               break;
1161             }
1162
1163           /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
1164              it here if it is defined in a non-shared object.  */
1165           if (h->type == STT_GNU_IFUNC
1166               && h->def_regular)
1167             {
1168               /* It is referenced by a non-shared object. */
1169               h->ref_regular = 1;
1170               h->needs_plt = 1;
1171
1172               /* STT_GNU_IFUNC symbol must go through PLT.  */
1173               h->plt.refcount += 1;
1174
1175               /* STT_GNU_IFUNC needs dynamic sections.  */
1176               if (htab->elf.dynobj == NULL)
1177                 htab->elf.dynobj = abfd;
1178
1179               switch (r_type)
1180                 {
1181                 default:
1182                   if (h->root.root.string)
1183                     name = h->root.root.string;
1184                   else
1185                     name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1186                                              NULL);
1187                   (*_bfd_error_handler)
1188                     (_("%B: relocation %s against STT_GNU_IFUNC "
1189                        "symbol `%s' isn't handled by %s"), abfd,
1190                      x86_64_elf_howto_table[r_type].name,
1191                      name, __FUNCTION__);
1192                   bfd_set_error (bfd_error_bad_value);
1193                   return FALSE;
1194
1195                 case R_X86_64_64:
1196                   h->non_got_ref = 1;
1197                   h->pointer_equality_needed = 1;
1198                   if (info->shared)
1199                     {
1200                       /* We must copy these reloc types into the output
1201                          file.  Create a reloc section in dynobj and
1202                          make room for this reloc.  */
1203                       sreloc = _bfd_elf_create_ifunc_dyn_reloc
1204                         (abfd, info, sec, sreloc,
1205                          &((struct elf64_x86_64_link_hash_entry *) h)->dyn_relocs);
1206                       if (sreloc == NULL)
1207                         return FALSE;
1208                     }
1209                   break;
1210
1211                 case R_X86_64_32S:
1212                 case R_X86_64_32:
1213                 case R_X86_64_PC32:
1214                 case R_X86_64_PC64:
1215                   h->non_got_ref = 1;
1216                   if (r_type != R_X86_64_PC32
1217                       && r_type != R_X86_64_PC64)
1218                     h->pointer_equality_needed = 1;
1219                   break;
1220
1221                 case R_X86_64_PLT32:
1222                   break;
1223
1224                 case R_X86_64_GOTPCREL:
1225                 case R_X86_64_GOTPCREL64:
1226                   h->got.refcount += 1;
1227                   if (htab->elf.sgot == NULL
1228                       && !_bfd_elf_create_got_section (htab->elf.dynobj,
1229                                                        info))
1230                     return FALSE;
1231                   break;
1232                 }
1233
1234               continue;
1235             }
1236         }
1237
1238       if (! elf64_x86_64_tls_transition (info, abfd, sec, NULL,
1239                                          symtab_hdr, sym_hashes,
1240                                          &r_type, GOT_UNKNOWN,
1241                                          rel, rel_end, h, r_symndx))
1242         return FALSE;
1243
1244       switch (r_type)
1245         {
1246         case R_X86_64_TLSLD:
1247           htab->tls_ld_got.refcount += 1;
1248           goto create_got;
1249
1250         case R_X86_64_TPOFF32:
1251           if (!info->executable)
1252             {
1253               if (h)
1254                 name = h->root.root.string;
1255               else
1256                 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1257                                          NULL);
1258               (*_bfd_error_handler)
1259                 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1260                  abfd,
1261                  x86_64_elf_howto_table[r_type].name, name);
1262               bfd_set_error (bfd_error_bad_value);
1263               return FALSE;
1264             }
1265           break;
1266
1267         case R_X86_64_GOTTPOFF:
1268           if (!info->executable)
1269             info->flags |= DF_STATIC_TLS;
1270           /* Fall through */
1271
1272         case R_X86_64_GOT32:
1273         case R_X86_64_GOTPCREL:
1274         case R_X86_64_TLSGD:
1275         case R_X86_64_GOT64:
1276         case R_X86_64_GOTPCREL64:
1277         case R_X86_64_GOTPLT64:
1278         case R_X86_64_GOTPC32_TLSDESC:
1279         case R_X86_64_TLSDESC_CALL:
1280           /* This symbol requires a global offset table entry.  */
1281           {
1282             int tls_type, old_tls_type;
1283
1284             switch (r_type)
1285               {
1286               default: tls_type = GOT_NORMAL; break;
1287               case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break;
1288               case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break;
1289               case R_X86_64_GOTPC32_TLSDESC:
1290               case R_X86_64_TLSDESC_CALL:
1291                 tls_type = GOT_TLS_GDESC; break;
1292               }
1293
1294             if (h != NULL)
1295               {
1296                 if (r_type == R_X86_64_GOTPLT64)
1297                   {
1298                     /* This relocation indicates that we also need
1299                        a PLT entry, as this is a function.  We don't need
1300                        a PLT entry for local symbols.  */
1301                     h->needs_plt = 1;
1302                     h->plt.refcount += 1;
1303                   }
1304                 h->got.refcount += 1;
1305                 old_tls_type = elf64_x86_64_hash_entry (h)->tls_type;
1306               }
1307             else
1308               {
1309                 bfd_signed_vma *local_got_refcounts;
1310
1311                 /* This is a global offset table entry for a local symbol.  */
1312                 local_got_refcounts = elf_local_got_refcounts (abfd);
1313                 if (local_got_refcounts == NULL)
1314                   {
1315                     bfd_size_type size;
1316
1317                     size = symtab_hdr->sh_info;
1318                     size *= sizeof (bfd_signed_vma)
1319                       + sizeof (bfd_vma) + sizeof (char);
1320                     local_got_refcounts = ((bfd_signed_vma *)
1321                                            bfd_zalloc (abfd, size));
1322                     if (local_got_refcounts == NULL)
1323                       return FALSE;
1324                     elf_local_got_refcounts (abfd) = local_got_refcounts;
1325                     elf64_x86_64_local_tlsdesc_gotent (abfd)
1326                       = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1327                     elf64_x86_64_local_got_tls_type (abfd)
1328                       = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1329                   }
1330                 local_got_refcounts[r_symndx] += 1;
1331                 old_tls_type
1332                   = elf64_x86_64_local_got_tls_type (abfd) [r_symndx];
1333               }
1334
1335             /* If a TLS symbol is accessed using IE at least once,
1336                there is no point to use dynamic model for it.  */
1337             if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1338                 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1339                     || tls_type != GOT_TLS_IE))
1340               {
1341                 if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type))
1342                   tls_type = old_tls_type;
1343                 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1344                          && GOT_TLS_GD_ANY_P (tls_type))
1345                   tls_type |= old_tls_type;
1346                 else
1347                   {
1348                     if (h)
1349                       name = h->root.root.string;
1350                     else
1351                       name = bfd_elf_sym_name (abfd, symtab_hdr,
1352                                                isym, NULL);
1353                     (*_bfd_error_handler)
1354                       (_("%B: '%s' accessed both as normal and thread local symbol"),
1355                        abfd, name);
1356                     return FALSE;
1357                   }
1358               }
1359
1360             if (old_tls_type != tls_type)
1361               {
1362                 if (h != NULL)
1363                   elf64_x86_64_hash_entry (h)->tls_type = tls_type;
1364                 else
1365                   elf64_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type;
1366               }
1367           }
1368           /* Fall through */
1369
1370         case R_X86_64_GOTOFF64:
1371         case R_X86_64_GOTPC32:
1372         case R_X86_64_GOTPC64:
1373         create_got:
1374           if (htab->elf.sgot == NULL)
1375             {
1376               if (htab->elf.dynobj == NULL)
1377                 htab->elf.dynobj = abfd;
1378               if (!_bfd_elf_create_got_section (htab->elf.dynobj,
1379                                                 info))
1380                 return FALSE;
1381             }
1382           break;
1383
1384         case R_X86_64_PLT32:
1385           /* This symbol requires a procedure linkage table entry.  We
1386              actually build the entry in adjust_dynamic_symbol,
1387              because this might be a case of linking PIC code which is
1388              never referenced by a dynamic object, in which case we
1389              don't need to generate a procedure linkage table entry
1390              after all.  */
1391
1392           /* If this is a local symbol, we resolve it directly without
1393              creating a procedure linkage table entry.  */
1394           if (h == NULL)
1395             continue;
1396
1397           h->needs_plt = 1;
1398           h->plt.refcount += 1;
1399           break;
1400
1401         case R_X86_64_PLTOFF64:
1402           /* This tries to form the 'address' of a function relative
1403              to GOT.  For global symbols we need a PLT entry.  */
1404           if (h != NULL)
1405             {
1406               h->needs_plt = 1;
1407               h->plt.refcount += 1;
1408             }
1409           goto create_got;
1410
1411         case R_X86_64_8:
1412         case R_X86_64_16:
1413         case R_X86_64_32:
1414         case R_X86_64_32S:
1415           /* Let's help debug shared library creation.  These relocs
1416              cannot be used in shared libs.  Don't error out for
1417              sections we don't care about, such as debug sections or
1418              non-constant sections.  */
1419           if (info->shared
1420               && (sec->flags & SEC_ALLOC) != 0
1421               && (sec->flags & SEC_READONLY) != 0)
1422             {
1423               if (h)
1424                 name = h->root.root.string;
1425               else
1426                 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1427               (*_bfd_error_handler)
1428                 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1429                  abfd, x86_64_elf_howto_table[r_type].name, name);
1430               bfd_set_error (bfd_error_bad_value);
1431               return FALSE;
1432             }
1433           /* Fall through.  */
1434
1435         case R_X86_64_PC8:
1436         case R_X86_64_PC16:
1437         case R_X86_64_PC32:
1438         case R_X86_64_PC64:
1439         case R_X86_64_64:
1440           if (h != NULL && info->executable)
1441             {
1442               /* If this reloc is in a read-only section, we might
1443                  need a copy reloc.  We can't check reliably at this
1444                  stage whether the section is read-only, as input
1445                  sections have not yet been mapped to output sections.
1446                  Tentatively set the flag for now, and correct in
1447                  adjust_dynamic_symbol.  */
1448               h->non_got_ref = 1;
1449
1450               /* We may need a .plt entry if the function this reloc
1451                  refers to is in a shared lib.  */
1452               h->plt.refcount += 1;
1453               if (r_type != R_X86_64_PC32 && r_type != R_X86_64_PC64)
1454                 h->pointer_equality_needed = 1;
1455             }
1456
1457           /* If we are creating a shared library, and this is a reloc
1458              against a global symbol, or a non PC relative reloc
1459              against a local symbol, then we need to copy the reloc
1460              into the shared library.  However, if we are linking with
1461              -Bsymbolic, we do not need to copy a reloc against a
1462              global symbol which is defined in an object we are
1463              including in the link (i.e., DEF_REGULAR is set).  At
1464              this point we have not seen all the input files, so it is
1465              possible that DEF_REGULAR is not set now but will be set
1466              later (it is never cleared).  In case of a weak definition,
1467              DEF_REGULAR may be cleared later by a strong definition in
1468              a shared library.  We account for that possibility below by
1469              storing information in the relocs_copied field of the hash
1470              table entry.  A similar situation occurs when creating
1471              shared libraries and symbol visibility changes render the
1472              symbol local.
1473
1474              If on the other hand, we are creating an executable, we
1475              may need to keep relocations for symbols satisfied by a
1476              dynamic library if we manage to avoid copy relocs for the
1477              symbol.  */
1478           if ((info->shared
1479                && (sec->flags & SEC_ALLOC) != 0
1480                && (! IS_X86_64_PCREL_TYPE (r_type)
1481                    || (h != NULL
1482                        && (! SYMBOLIC_BIND (info, h)
1483                            || h->root.type == bfd_link_hash_defweak
1484                            || !h->def_regular))))
1485               || (ELIMINATE_COPY_RELOCS
1486                   && !info->shared
1487                   && (sec->flags & SEC_ALLOC) != 0
1488                   && h != NULL
1489                   && (h->root.type == bfd_link_hash_defweak
1490                       || !h->def_regular)))
1491             {
1492               struct elf_dyn_relocs *p;
1493               struct elf_dyn_relocs **head;
1494
1495               /* We must copy these reloc types into the output file.
1496                  Create a reloc section in dynobj and make room for
1497                  this reloc.  */
1498               if (sreloc == NULL)
1499                 {
1500                   if (htab->elf.dynobj == NULL)
1501                     htab->elf.dynobj = abfd;
1502
1503                   sreloc = _bfd_elf_make_dynamic_reloc_section
1504                     (sec, htab->elf.dynobj, 3, abfd, /*rela?*/ TRUE);
1505
1506                   if (sreloc == NULL)
1507                     return FALSE;
1508                 }
1509
1510               /* If this is a global symbol, we count the number of
1511                  relocations we need for this symbol.  */
1512               if (h != NULL)
1513                 {
1514                   head = &((struct elf64_x86_64_link_hash_entry *) h)->dyn_relocs;
1515                 }
1516               else
1517                 {
1518                   /* Track dynamic relocs needed for local syms too.
1519                      We really need local syms available to do this
1520                      easily.  Oh well.  */
1521                   asection *s;
1522                   void **vpp;
1523
1524                   isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1525                                                 abfd, r_symndx);
1526                   if (isym == NULL)
1527                     return FALSE;
1528
1529                   s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1530                   if (s == NULL)
1531                     s = sec;
1532
1533                   /* Beware of type punned pointers vs strict aliasing
1534                      rules.  */
1535                   vpp = &(elf_section_data (s)->local_dynrel);
1536                   head = (struct elf_dyn_relocs **)vpp;
1537                 }
1538
1539               p = *head;
1540               if (p == NULL || p->sec != sec)
1541                 {
1542                   bfd_size_type amt = sizeof *p;
1543
1544                   p = ((struct elf_dyn_relocs *)
1545                        bfd_alloc (htab->elf.dynobj, amt));
1546                   if (p == NULL)
1547                     return FALSE;
1548                   p->next = *head;
1549                   *head = p;
1550                   p->sec = sec;
1551                   p->count = 0;
1552                   p->pc_count = 0;
1553                 }
1554
1555               p->count += 1;
1556               if (IS_X86_64_PCREL_TYPE (r_type))
1557                 p->pc_count += 1;
1558             }
1559           break;
1560
1561           /* This relocation describes the C++ object vtable hierarchy.
1562              Reconstruct it for later use during GC.  */
1563         case R_X86_64_GNU_VTINHERIT:
1564           if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1565             return FALSE;
1566           break;
1567
1568           /* This relocation describes which C++ vtable entries are actually
1569              used.  Record for later use during GC.  */
1570         case R_X86_64_GNU_VTENTRY:
1571           BFD_ASSERT (h != NULL);
1572           if (h != NULL
1573               && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1574             return FALSE;
1575           break;
1576
1577         default:
1578           break;
1579         }
1580     }
1581
1582   return TRUE;
1583 }
1584
1585 /* Return the section that should be marked against GC for a given
1586    relocation.  */
1587
1588 static asection *
1589 elf64_x86_64_gc_mark_hook (asection *sec,
1590                            struct bfd_link_info *info,
1591                            Elf_Internal_Rela *rel,
1592                            struct elf_link_hash_entry *h,
1593                            Elf_Internal_Sym *sym)
1594 {
1595   if (h != NULL)
1596     switch (ELF64_R_TYPE (rel->r_info))
1597       {
1598       case R_X86_64_GNU_VTINHERIT:
1599       case R_X86_64_GNU_VTENTRY:
1600         return NULL;
1601       }
1602
1603   return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1604 }
1605
1606 /* Update the got entry reference counts for the section being removed.  */
1607
1608 static bfd_boolean
1609 elf64_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info,
1610                             asection *sec,
1611                             const Elf_Internal_Rela *relocs)
1612 {
1613   struct elf64_x86_64_link_hash_table *htab;
1614   Elf_Internal_Shdr *symtab_hdr;
1615   struct elf_link_hash_entry **sym_hashes;
1616   bfd_signed_vma *local_got_refcounts;
1617   const Elf_Internal_Rela *rel, *relend;
1618
1619   if (info->relocatable)
1620     return TRUE;
1621
1622   htab = elf64_x86_64_hash_table (info);
1623   if (htab == NULL)
1624     return FALSE;
1625
1626   elf_section_data (sec)->local_dynrel = NULL;
1627
1628   symtab_hdr = &elf_symtab_hdr (abfd);
1629   sym_hashes = elf_sym_hashes (abfd);
1630   local_got_refcounts = elf_local_got_refcounts (abfd);
1631
1632   relend = relocs + sec->reloc_count;
1633   for (rel = relocs; rel < relend; rel++)
1634     {
1635       unsigned long r_symndx;
1636       unsigned int r_type;
1637       struct elf_link_hash_entry *h = NULL;
1638
1639       r_symndx = ELF64_R_SYM (rel->r_info);
1640       if (r_symndx >= symtab_hdr->sh_info)
1641         {
1642           struct elf64_x86_64_link_hash_entry *eh;
1643           struct elf_dyn_relocs **pp;
1644           struct elf_dyn_relocs *p;
1645
1646           h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1647           while (h->root.type == bfd_link_hash_indirect
1648                  || h->root.type == bfd_link_hash_warning)
1649             h = (struct elf_link_hash_entry *) h->root.u.i.link;
1650           eh = (struct elf64_x86_64_link_hash_entry *) h;
1651
1652           for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1653             if (p->sec == sec)
1654               {
1655                 /* Everything must go for SEC.  */
1656                 *pp = p->next;
1657                 break;
1658               }
1659         }
1660
1661       r_type = ELF64_R_TYPE (rel->r_info);
1662       if (! elf64_x86_64_tls_transition (info, abfd, sec, NULL,
1663                                          symtab_hdr, sym_hashes,
1664                                          &r_type, GOT_UNKNOWN,
1665                                          rel, relend, h, r_symndx))
1666         return FALSE;
1667
1668       switch (r_type)
1669         {
1670         case R_X86_64_TLSLD:
1671           if (htab->tls_ld_got.refcount > 0)
1672             htab->tls_ld_got.refcount -= 1;
1673           break;
1674
1675         case R_X86_64_TLSGD:
1676         case R_X86_64_GOTPC32_TLSDESC:
1677         case R_X86_64_TLSDESC_CALL:
1678         case R_X86_64_GOTTPOFF:
1679         case R_X86_64_GOT32:
1680         case R_X86_64_GOTPCREL:
1681         case R_X86_64_GOT64:
1682         case R_X86_64_GOTPCREL64:
1683         case R_X86_64_GOTPLT64:
1684           if (h != NULL)
1685             {
1686               if (r_type == R_X86_64_GOTPLT64 && h->plt.refcount > 0)
1687                 h->plt.refcount -= 1;
1688               if (h->got.refcount > 0)
1689                 h->got.refcount -= 1;
1690             }
1691           else if (local_got_refcounts != NULL)
1692             {
1693               if (local_got_refcounts[r_symndx] > 0)
1694                 local_got_refcounts[r_symndx] -= 1;
1695             }
1696           break;
1697
1698         case R_X86_64_8:
1699         case R_X86_64_16:
1700         case R_X86_64_32:
1701         case R_X86_64_64:
1702         case R_X86_64_32S:
1703         case R_X86_64_PC8:
1704         case R_X86_64_PC16:
1705         case R_X86_64_PC32:
1706         case R_X86_64_PC64:
1707           if (info->shared)
1708             break;
1709           /* Fall thru */
1710
1711         case R_X86_64_PLT32:
1712         case R_X86_64_PLTOFF64:
1713           if (h != NULL)
1714             {
1715               if (h->plt.refcount > 0)
1716                 h->plt.refcount -= 1;
1717             }
1718           break;
1719
1720         default:
1721           break;
1722         }
1723     }
1724
1725   return TRUE;
1726 }
1727
1728 /* Adjust a symbol defined by a dynamic object and referenced by a
1729    regular object.  The current definition is in some section of the
1730    dynamic object, but we're not including those sections.  We have to
1731    change the definition to something the rest of the link can
1732    understand.  */
1733
1734 static bfd_boolean
1735 elf64_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info,
1736                                     struct elf_link_hash_entry *h)
1737 {
1738   struct elf64_x86_64_link_hash_table *htab;
1739   asection *s;
1740
1741   /* STT_GNU_IFUNC symbol must go through PLT. */
1742   if (h->type == STT_GNU_IFUNC)
1743     {
1744       if (h->plt.refcount <= 0)
1745         {
1746           h->plt.offset = (bfd_vma) -1;
1747           h->needs_plt = 0;
1748         }
1749       return TRUE;
1750     }
1751
1752   /* If this is a function, put it in the procedure linkage table.  We
1753      will fill in the contents of the procedure linkage table later,
1754      when we know the address of the .got section.  */
1755   if (h->type == STT_FUNC
1756       || h->needs_plt)
1757     {
1758       if (h->plt.refcount <= 0
1759           || SYMBOL_CALLS_LOCAL (info, h)
1760           || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1761               && h->root.type == bfd_link_hash_undefweak))
1762         {
1763           /* This case can occur if we saw a PLT32 reloc in an input
1764              file, but the symbol was never referred to by a dynamic
1765              object, or if all references were garbage collected.  In
1766              such a case, we don't actually need to build a procedure
1767              linkage table, and we can just do a PC32 reloc instead.  */
1768           h->plt.offset = (bfd_vma) -1;
1769           h->needs_plt = 0;
1770         }
1771
1772       return TRUE;
1773     }
1774   else
1775     /* It's possible that we incorrectly decided a .plt reloc was
1776        needed for an R_X86_64_PC32 reloc to a non-function sym in
1777        check_relocs.  We can't decide accurately between function and
1778        non-function syms in check-relocs;  Objects loaded later in
1779        the link may change h->type.  So fix it now.  */
1780     h->plt.offset = (bfd_vma) -1;
1781
1782   /* If this is a weak symbol, and there is a real definition, the
1783      processor independent code will have arranged for us to see the
1784      real definition first, and we can just use the same value.  */
1785   if (h->u.weakdef != NULL)
1786     {
1787       BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1788                   || h->u.weakdef->root.type == bfd_link_hash_defweak);
1789       h->root.u.def.section = h->u.weakdef->root.u.def.section;
1790       h->root.u.def.value = h->u.weakdef->root.u.def.value;
1791       if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1792         h->non_got_ref = h->u.weakdef->non_got_ref;
1793       return TRUE;
1794     }
1795
1796   /* This is a reference to a symbol defined by a dynamic object which
1797      is not a function.  */
1798
1799   /* If we are creating a shared library, we must presume that the
1800      only references to the symbol are via the global offset table.
1801      For such cases we need not do anything here; the relocations will
1802      be handled correctly by relocate_section.  */
1803   if (info->shared)
1804     return TRUE;
1805
1806   /* If there are no references to this symbol that do not use the
1807      GOT, we don't need to generate a copy reloc.  */
1808   if (!h->non_got_ref)
1809     return TRUE;
1810
1811   /* If -z nocopyreloc was given, we won't generate them either.  */
1812   if (info->nocopyreloc)
1813     {
1814       h->non_got_ref = 0;
1815       return TRUE;
1816     }
1817
1818   if (ELIMINATE_COPY_RELOCS)
1819     {
1820       struct elf64_x86_64_link_hash_entry * eh;
1821       struct elf_dyn_relocs *p;
1822
1823       eh = (struct elf64_x86_64_link_hash_entry *) h;
1824       for (p = eh->dyn_relocs; p != NULL; p = p->next)
1825         {
1826           s = p->sec->output_section;
1827           if (s != NULL && (s->flags & SEC_READONLY) != 0)
1828             break;
1829         }
1830
1831       /* If we didn't find any dynamic relocs in read-only sections, then
1832          we'll be keeping the dynamic relocs and avoiding the copy reloc.  */
1833       if (p == NULL)
1834         {
1835           h->non_got_ref = 0;
1836           return TRUE;
1837         }
1838     }
1839
1840   if (h->size == 0)
1841     {
1842       (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
1843                              h->root.root.string);
1844       return TRUE;
1845     }
1846
1847   /* We must allocate the symbol in our .dynbss section, which will
1848      become part of the .bss section of the executable.  There will be
1849      an entry for this symbol in the .dynsym section.  The dynamic
1850      object will contain position independent code, so all references
1851      from the dynamic object to this symbol will go through the global
1852      offset table.  The dynamic linker will use the .dynsym entry to
1853      determine the address it must put in the global offset table, so
1854      both the dynamic object and the regular object will refer to the
1855      same memory location for the variable.  */
1856
1857   htab = elf64_x86_64_hash_table (info);
1858   if (htab == NULL)
1859     return FALSE;
1860
1861   /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
1862      to copy the initial value out of the dynamic object and into the
1863      runtime process image.  */
1864   if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1865     {
1866       htab->srelbss->size += sizeof (Elf64_External_Rela);
1867       h->needs_copy = 1;
1868     }
1869
1870   s = htab->sdynbss;
1871
1872   return _bfd_elf_adjust_dynamic_copy (h, s);
1873 }
1874
1875 /* Allocate space in .plt, .got and associated reloc sections for
1876    dynamic relocs.  */
1877
1878 static bfd_boolean
1879 elf64_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
1880 {
1881   struct bfd_link_info *info;
1882   struct elf64_x86_64_link_hash_table *htab;
1883   struct elf64_x86_64_link_hash_entry *eh;
1884   struct elf_dyn_relocs *p;
1885
1886   if (h->root.type == bfd_link_hash_indirect)
1887     return TRUE;
1888
1889   if (h->root.type == bfd_link_hash_warning)
1890     h = (struct elf_link_hash_entry *) h->root.u.i.link;
1891   eh = (struct elf64_x86_64_link_hash_entry *) h;
1892
1893   info = (struct bfd_link_info *) inf;
1894   htab = elf64_x86_64_hash_table (info);
1895   if (htab == NULL)
1896     return FALSE;
1897
1898   /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
1899      here if it is defined and referenced in a non-shared object.  */
1900   if (h->type == STT_GNU_IFUNC
1901       && h->def_regular)
1902     return _bfd_elf_allocate_ifunc_dyn_relocs (info, h,
1903                                                &eh->dyn_relocs,
1904                                                PLT_ENTRY_SIZE,
1905                                                GOT_ENTRY_SIZE);
1906   else if (htab->elf.dynamic_sections_created
1907            && h->plt.refcount > 0)
1908     {
1909       /* Make sure this symbol is output as a dynamic symbol.
1910          Undefined weak syms won't yet be marked as dynamic.  */
1911       if (h->dynindx == -1
1912           && !h->forced_local)
1913         {
1914           if (! bfd_elf_link_record_dynamic_symbol (info, h))
1915             return FALSE;
1916         }
1917
1918       if (info->shared
1919           || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1920         {
1921           asection *s = htab->elf.splt;
1922
1923           /* If this is the first .plt entry, make room for the special
1924              first entry.  */
1925           if (s->size == 0)
1926             s->size += PLT_ENTRY_SIZE;
1927
1928           h->plt.offset = s->size;
1929
1930           /* If this symbol is not defined in a regular file, and we are
1931              not generating a shared library, then set the symbol to this
1932              location in the .plt.  This is required to make function
1933              pointers compare as equal between the normal executable and
1934              the shared library.  */
1935           if (! info->shared
1936               && !h->def_regular)
1937             {
1938               h->root.u.def.section = s;
1939               h->root.u.def.value = h->plt.offset;
1940             }
1941
1942           /* Make room for this entry.  */
1943           s->size += PLT_ENTRY_SIZE;
1944
1945           /* We also need to make an entry in the .got.plt section, which
1946              will be placed in the .got section by the linker script.  */
1947           htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
1948
1949           /* We also need to make an entry in the .rela.plt section.  */
1950           htab->elf.srelplt->size += sizeof (Elf64_External_Rela);
1951           htab->elf.srelplt->reloc_count++;
1952         }
1953       else
1954         {
1955           h->plt.offset = (bfd_vma) -1;
1956           h->needs_plt = 0;
1957         }
1958     }
1959   else
1960     {
1961       h->plt.offset = (bfd_vma) -1;
1962       h->needs_plt = 0;
1963     }
1964
1965   eh->tlsdesc_got = (bfd_vma) -1;
1966
1967   /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
1968      make it a R_X86_64_TPOFF32 requiring no GOT entry.  */
1969   if (h->got.refcount > 0
1970       && info->executable
1971       && h->dynindx == -1
1972       && elf64_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE)
1973     {
1974       h->got.offset = (bfd_vma) -1;
1975     }
1976   else if (h->got.refcount > 0)
1977     {
1978       asection *s;
1979       bfd_boolean dyn;
1980       int tls_type = elf64_x86_64_hash_entry (h)->tls_type;
1981
1982       /* Make sure this symbol is output as a dynamic symbol.
1983          Undefined weak syms won't yet be marked as dynamic.  */
1984       if (h->dynindx == -1
1985           && !h->forced_local)
1986         {
1987           if (! bfd_elf_link_record_dynamic_symbol (info, h))
1988             return FALSE;
1989         }
1990
1991       if (GOT_TLS_GDESC_P (tls_type))
1992         {
1993           eh->tlsdesc_got = htab->elf.sgotplt->size
1994             - elf64_x86_64_compute_jump_table_size (htab);
1995           htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
1996           h->got.offset = (bfd_vma) -2;
1997         }
1998       if (! GOT_TLS_GDESC_P (tls_type)
1999           || GOT_TLS_GD_P (tls_type))
2000         {
2001           s = htab->elf.sgot;
2002           h->got.offset = s->size;
2003           s->size += GOT_ENTRY_SIZE;
2004           if (GOT_TLS_GD_P (tls_type))
2005             s->size += GOT_ENTRY_SIZE;
2006         }
2007       dyn = htab->elf.dynamic_sections_created;
2008       /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2009          and two if global.
2010          R_X86_64_GOTTPOFF needs one dynamic relocation.  */
2011       if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2012           || tls_type == GOT_TLS_IE)
2013         htab->elf.srelgot->size += sizeof (Elf64_External_Rela);
2014       else if (GOT_TLS_GD_P (tls_type))
2015         htab->elf.srelgot->size += 2 * sizeof (Elf64_External_Rela);
2016       else if (! GOT_TLS_GDESC_P (tls_type)
2017                && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2018                    || h->root.type != bfd_link_hash_undefweak)
2019                && (info->shared
2020                    || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2021         htab->elf.srelgot->size += sizeof (Elf64_External_Rela);
2022       if (GOT_TLS_GDESC_P (tls_type))
2023         {
2024           htab->elf.srelplt->size += sizeof (Elf64_External_Rela);
2025           htab->tlsdesc_plt = (bfd_vma) -1;
2026         }
2027     }
2028   else
2029     h->got.offset = (bfd_vma) -1;
2030
2031   if (eh->dyn_relocs == NULL)
2032     return TRUE;
2033
2034   /* In the shared -Bsymbolic case, discard space allocated for
2035      dynamic pc-relative relocs against symbols which turn out to be
2036      defined in regular objects.  For the normal shared case, discard
2037      space for pc-relative relocs that have become local due to symbol
2038      visibility changes.  */
2039
2040   if (info->shared)
2041     {
2042       /* Relocs that use pc_count are those that appear on a call
2043          insn, or certain REL relocs that can generated via assembly.
2044          We want calls to protected symbols to resolve directly to the
2045          function rather than going via the plt.  If people want
2046          function pointer comparisons to work as expected then they
2047          should avoid writing weird assembly.  */
2048       if (SYMBOL_CALLS_LOCAL (info, h))
2049         {
2050           struct elf_dyn_relocs **pp;
2051
2052           for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2053             {
2054               p->count -= p->pc_count;
2055               p->pc_count = 0;
2056               if (p->count == 0)
2057                 *pp = p->next;
2058               else
2059                 pp = &p->next;
2060             }
2061         }
2062
2063       /* Also discard relocs on undefined weak syms with non-default
2064          visibility.  */
2065       if (eh->dyn_relocs != NULL
2066           && h->root.type == bfd_link_hash_undefweak)
2067         {
2068           if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2069             eh->dyn_relocs = NULL;
2070
2071           /* Make sure undefined weak symbols are output as a dynamic
2072              symbol in PIEs.  */
2073           else if (h->dynindx == -1
2074                    && ! h->forced_local
2075                    && ! bfd_elf_link_record_dynamic_symbol (info, h))
2076             return FALSE;
2077         }
2078
2079     }
2080   else if (ELIMINATE_COPY_RELOCS)
2081     {
2082       /* For the non-shared case, discard space for relocs against
2083          symbols which turn out to need copy relocs or are not
2084          dynamic.  */
2085
2086       if (!h->non_got_ref
2087           && ((h->def_dynamic
2088                && !h->def_regular)
2089               || (htab->elf.dynamic_sections_created
2090                   && (h->root.type == bfd_link_hash_undefweak
2091                       || h->root.type == bfd_link_hash_undefined))))
2092         {
2093           /* Make sure this symbol is output as a dynamic symbol.
2094              Undefined weak syms won't yet be marked as dynamic.  */
2095           if (h->dynindx == -1
2096               && ! h->forced_local
2097               && ! bfd_elf_link_record_dynamic_symbol (info, h))
2098             return FALSE;
2099
2100           /* If that succeeded, we know we'll be keeping all the
2101              relocs.  */
2102           if (h->dynindx != -1)
2103             goto keep;
2104         }
2105
2106       eh->dyn_relocs = NULL;
2107
2108     keep: ;
2109     }
2110
2111   /* Finally, allocate space.  */
2112   for (p = eh->dyn_relocs; p != NULL; p = p->next)
2113     {
2114       asection * sreloc;
2115
2116       sreloc = elf_section_data (p->sec)->sreloc;
2117
2118       BFD_ASSERT (sreloc != NULL);
2119
2120       sreloc->size += p->count * sizeof (Elf64_External_Rela);
2121     }
2122
2123   return TRUE;
2124 }
2125
2126 /* Allocate space in .plt, .got and associated reloc sections for
2127    local dynamic relocs.  */
2128
2129 static bfd_boolean
2130 elf64_x86_64_allocate_local_dynrelocs (void **slot, void *inf)
2131 {
2132   struct elf_link_hash_entry *h
2133     = (struct elf_link_hash_entry *) *slot;
2134
2135   if (h->type != STT_GNU_IFUNC
2136       || !h->def_regular
2137       || !h->ref_regular
2138       || !h->forced_local
2139       || h->root.type != bfd_link_hash_defined)
2140     abort ();
2141
2142   return elf64_x86_64_allocate_dynrelocs (h, inf);
2143 }
2144
2145 /* Find any dynamic relocs that apply to read-only sections.  */
2146
2147 static bfd_boolean
2148 elf64_x86_64_readonly_dynrelocs (struct elf_link_hash_entry *h, void * inf)
2149 {
2150   struct elf64_x86_64_link_hash_entry *eh;
2151   struct elf_dyn_relocs *p;
2152
2153   if (h->root.type == bfd_link_hash_warning)
2154     h = (struct elf_link_hash_entry *) h->root.u.i.link;
2155
2156   eh = (struct elf64_x86_64_link_hash_entry *) h;
2157   for (p = eh->dyn_relocs; p != NULL; p = p->next)
2158     {
2159       asection *s = p->sec->output_section;
2160
2161       if (s != NULL && (s->flags & SEC_READONLY) != 0)
2162         {
2163           struct bfd_link_info *info = (struct bfd_link_info *) inf;
2164
2165           info->flags |= DF_TEXTREL;
2166
2167           /* Not an error, just cut short the traversal.  */
2168           return FALSE;
2169         }
2170     }
2171   return TRUE;
2172 }
2173
2174 /* Set the sizes of the dynamic sections.  */
2175
2176 static bfd_boolean
2177 elf64_x86_64_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
2178                                     struct bfd_link_info *info)
2179 {
2180   struct elf64_x86_64_link_hash_table *htab;
2181   bfd *dynobj;
2182   asection *s;
2183   bfd_boolean relocs;
2184   bfd *ibfd;
2185
2186   htab = elf64_x86_64_hash_table (info);
2187   if (htab == NULL)
2188     return FALSE;
2189
2190   dynobj = htab->elf.dynobj;
2191   if (dynobj == NULL)
2192     abort ();
2193
2194   if (htab->elf.dynamic_sections_created)
2195     {
2196       /* Set the contents of the .interp section to the interpreter.  */
2197       if (info->executable)
2198         {
2199           s = bfd_get_section_by_name (dynobj, ".interp");
2200           if (s == NULL)
2201             abort ();
2202           s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2203           s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2204         }
2205     }
2206
2207   /* Set up .got offsets for local syms, and space for local dynamic
2208      relocs.  */
2209   for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2210     {
2211       bfd_signed_vma *local_got;
2212       bfd_signed_vma *end_local_got;
2213       char *local_tls_type;
2214       bfd_vma *local_tlsdesc_gotent;
2215       bfd_size_type locsymcount;
2216       Elf_Internal_Shdr *symtab_hdr;
2217       asection *srel;
2218
2219       if (! is_x86_64_elf (ibfd))
2220         continue;
2221
2222       for (s = ibfd->sections; s != NULL; s = s->next)
2223         {
2224           struct elf_dyn_relocs *p;
2225
2226           for (p = (struct elf_dyn_relocs *)
2227                     (elf_section_data (s)->local_dynrel);
2228                p != NULL;
2229                p = p->next)
2230             {
2231               if (!bfd_is_abs_section (p->sec)
2232                   && bfd_is_abs_section (p->sec->output_section))
2233                 {
2234                   /* Input section has been discarded, either because
2235                      it is a copy of a linkonce section or due to
2236                      linker script /DISCARD/, so we'll be discarding
2237                      the relocs too.  */
2238                 }
2239               else if (p->count != 0)
2240                 {
2241                   srel = elf_section_data (p->sec)->sreloc;
2242                   srel->size += p->count * sizeof (Elf64_External_Rela);
2243                   if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2244                     info->flags |= DF_TEXTREL;
2245                 }
2246             }
2247         }
2248
2249       local_got = elf_local_got_refcounts (ibfd);
2250       if (!local_got)
2251         continue;
2252
2253       symtab_hdr = &elf_symtab_hdr (ibfd);
2254       locsymcount = symtab_hdr->sh_info;
2255       end_local_got = local_got + locsymcount;
2256       local_tls_type = elf64_x86_64_local_got_tls_type (ibfd);
2257       local_tlsdesc_gotent = elf64_x86_64_local_tlsdesc_gotent (ibfd);
2258       s = htab->elf.sgot;
2259       srel = htab->elf.srelgot;
2260       for (; local_got < end_local_got;
2261            ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2262         {
2263           *local_tlsdesc_gotent = (bfd_vma) -1;
2264           if (*local_got > 0)
2265             {
2266               if (GOT_TLS_GDESC_P (*local_tls_type))
2267                 {
2268                   *local_tlsdesc_gotent = htab->elf.sgotplt->size
2269                     - elf64_x86_64_compute_jump_table_size (htab);
2270                   htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
2271                   *local_got = (bfd_vma) -2;
2272                 }
2273               if (! GOT_TLS_GDESC_P (*local_tls_type)
2274                   || GOT_TLS_GD_P (*local_tls_type))
2275                 {
2276                   *local_got = s->size;
2277                   s->size += GOT_ENTRY_SIZE;
2278                   if (GOT_TLS_GD_P (*local_tls_type))
2279                     s->size += GOT_ENTRY_SIZE;
2280                 }
2281               if (info->shared
2282                   || GOT_TLS_GD_ANY_P (*local_tls_type)
2283                   || *local_tls_type == GOT_TLS_IE)
2284                 {
2285                   if (GOT_TLS_GDESC_P (*local_tls_type))
2286                     {
2287                       htab->elf.srelplt->size
2288                         += sizeof (Elf64_External_Rela);
2289                       htab->tlsdesc_plt = (bfd_vma) -1;
2290                     }
2291                   if (! GOT_TLS_GDESC_P (*local_tls_type)
2292                       || GOT_TLS_GD_P (*local_tls_type))
2293                     srel->size += sizeof (Elf64_External_Rela);
2294                 }
2295             }
2296           else
2297             *local_got = (bfd_vma) -1;
2298         }
2299     }
2300
2301   if (htab->tls_ld_got.refcount > 0)
2302     {
2303       /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
2304          relocs.  */
2305       htab->tls_ld_got.offset = htab->elf.sgot->size;
2306       htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
2307       htab->elf.srelgot->size += sizeof (Elf64_External_Rela);
2308     }
2309   else
2310     htab->tls_ld_got.offset = -1;
2311
2312   /* Allocate global sym .plt and .got entries, and space for global
2313      sym dynamic relocs.  */
2314   elf_link_hash_traverse (&htab->elf, elf64_x86_64_allocate_dynrelocs,
2315                           info);
2316
2317   /* Allocate .plt and .got entries, and space for local symbols.  */
2318   htab_traverse (htab->loc_hash_table,
2319                  elf64_x86_64_allocate_local_dynrelocs,
2320                  info);
2321
2322   /* For every jump slot reserved in the sgotplt, reloc_count is
2323      incremented.  However, when we reserve space for TLS descriptors,
2324      it's not incremented, so in order to compute the space reserved
2325      for them, it suffices to multiply the reloc count by the jump
2326      slot size.  */
2327   if (htab->elf.srelplt)
2328     htab->sgotplt_jump_table_size
2329       = elf64_x86_64_compute_jump_table_size (htab);
2330
2331   if (htab->tlsdesc_plt)
2332     {
2333       /* If we're not using lazy TLS relocations, don't generate the
2334          PLT and GOT entries they require.  */
2335       if ((info->flags & DF_BIND_NOW))
2336         htab->tlsdesc_plt = 0;
2337       else
2338         {
2339           htab->tlsdesc_got = htab->elf.sgot->size;
2340           htab->elf.sgot->size += GOT_ENTRY_SIZE;
2341           /* Reserve room for the initial entry.
2342              FIXME: we could probably do away with it in this case.  */
2343           if (htab->elf.splt->size == 0)
2344             htab->elf.splt->size += PLT_ENTRY_SIZE;
2345           htab->tlsdesc_plt = htab->elf.splt->size;
2346           htab->elf.splt->size += PLT_ENTRY_SIZE;
2347         }
2348     }
2349
2350   /* We now have determined the sizes of the various dynamic sections.
2351      Allocate memory for them.  */
2352   relocs = FALSE;
2353   for (s = dynobj->sections; s != NULL; s = s->next)
2354     {
2355       if ((s->flags & SEC_LINKER_CREATED) == 0)
2356         continue;
2357
2358       if (s == htab->elf.splt
2359           || s == htab->elf.sgot
2360           || s == htab->elf.sgotplt
2361           || s == htab->elf.iplt
2362           || s == htab->elf.igotplt
2363           || s == htab->sdynbss)
2364         {
2365           /* Strip this section if we don't need it; see the
2366              comment below.  */
2367         }
2368       else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
2369         {
2370           if (s->size != 0 && s != htab->elf.srelplt)
2371             relocs = TRUE;
2372
2373           /* We use the reloc_count field as a counter if we need
2374              to copy relocs into the output file.  */
2375           if (s != htab->elf.srelplt)
2376             s->reloc_count = 0;
2377         }
2378       else
2379         {
2380           /* It's not one of our sections, so don't allocate space.  */
2381           continue;
2382         }
2383
2384       if (s->size == 0)
2385         {
2386           /* If we don't need this section, strip it from the
2387              output file.  This is mostly to handle .rela.bss and
2388              .rela.plt.  We must create both sections in
2389              create_dynamic_sections, because they must be created
2390              before the linker maps input sections to output
2391              sections.  The linker does that before
2392              adjust_dynamic_symbol is called, and it is that
2393              function which decides whether anything needs to go
2394              into these sections.  */
2395
2396           s->flags |= SEC_EXCLUDE;
2397           continue;
2398         }
2399
2400       if ((s->flags & SEC_HAS_CONTENTS) == 0)
2401         continue;
2402
2403       /* Allocate memory for the section contents.  We use bfd_zalloc
2404          here in case unused entries are not reclaimed before the
2405          section's contents are written out.  This should not happen,
2406          but this way if it does, we get a R_X86_64_NONE reloc instead
2407          of garbage.  */
2408       s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2409       if (s->contents == NULL)
2410         return FALSE;
2411     }
2412
2413   if (htab->elf.dynamic_sections_created)
2414     {
2415       /* Add some entries to the .dynamic section.  We fill in the
2416          values later, in elf64_x86_64_finish_dynamic_sections, but we
2417          must add the entries now so that we get the correct size for
2418          the .dynamic section.  The DT_DEBUG entry is filled in by the
2419          dynamic linker and used by the debugger.  */
2420 #define add_dynamic_entry(TAG, VAL) \
2421   _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2422
2423       if (info->executable)
2424         {
2425           if (!add_dynamic_entry (DT_DEBUG, 0))
2426             return FALSE;
2427         }
2428
2429       if (htab->elf.splt->size != 0)
2430         {
2431           if (!add_dynamic_entry (DT_PLTGOT, 0)
2432               || !add_dynamic_entry (DT_PLTRELSZ, 0)
2433               || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2434               || !add_dynamic_entry (DT_JMPREL, 0))
2435             return FALSE;
2436
2437           if (htab->tlsdesc_plt
2438               && (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
2439                   || !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
2440             return FALSE;
2441         }
2442
2443       if (relocs)
2444         {
2445           if (!add_dynamic_entry (DT_RELA, 0)
2446               || !add_dynamic_entry (DT_RELASZ, 0)
2447               || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
2448             return FALSE;
2449
2450           /* If any dynamic relocs apply to a read-only section,
2451              then we need a DT_TEXTREL entry.  */
2452           if ((info->flags & DF_TEXTREL) == 0)
2453             elf_link_hash_traverse (&htab->elf,
2454                                     elf64_x86_64_readonly_dynrelocs,
2455                                     info);
2456
2457           if ((info->flags & DF_TEXTREL) != 0)
2458             {
2459               if (!add_dynamic_entry (DT_TEXTREL, 0))
2460                 return FALSE;
2461             }
2462         }
2463     }
2464 #undef add_dynamic_entry
2465
2466   return TRUE;
2467 }
2468
2469 static bfd_boolean
2470 elf64_x86_64_always_size_sections (bfd *output_bfd,
2471                                    struct bfd_link_info *info)
2472 {
2473   asection *tls_sec = elf_hash_table (info)->tls_sec;
2474
2475   if (tls_sec)
2476     {
2477       struct elf_link_hash_entry *tlsbase;
2478
2479       tlsbase = elf_link_hash_lookup (elf_hash_table (info),
2480                                       "_TLS_MODULE_BASE_",
2481                                       FALSE, FALSE, FALSE);
2482
2483       if (tlsbase && tlsbase->type == STT_TLS)
2484         {
2485           struct elf64_x86_64_link_hash_table *htab;
2486           struct bfd_link_hash_entry *bh = NULL;
2487           const struct elf_backend_data *bed
2488             = get_elf_backend_data (output_bfd);
2489
2490           htab = elf64_x86_64_hash_table (info);
2491           if (htab == NULL)
2492             return FALSE;
2493
2494           if (!(_bfd_generic_link_add_one_symbol
2495                 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
2496                  tls_sec, 0, NULL, FALSE,
2497                  bed->collect, &bh)))
2498             return FALSE;
2499
2500           htab->tls_module_base = bh;
2501
2502           tlsbase = (struct elf_link_hash_entry *)bh;
2503           tlsbase->def_regular = 1;
2504           tlsbase->other = STV_HIDDEN;
2505           (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
2506         }
2507     }
2508
2509   return TRUE;
2510 }
2511
2512 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
2513    executables.  Rather than setting it to the beginning of the TLS
2514    section, we have to set it to the end.  This function may be called
2515    multiple times, it is idempotent.  */
2516
2517 static void
2518 elf64_x86_64_set_tls_module_base (struct bfd_link_info *info)
2519 {
2520   struct elf64_x86_64_link_hash_table *htab;
2521   struct bfd_link_hash_entry *base;
2522
2523   if (!info->executable)
2524     return;
2525
2526   htab = elf64_x86_64_hash_table (info);
2527   if (htab == NULL)
2528     return;
2529
2530   base = htab->tls_module_base;
2531   if (base == NULL)
2532     return;
2533
2534   base->u.def.value = htab->elf.tls_size;
2535 }
2536
2537 /* Return the base VMA address which should be subtracted from real addresses
2538    when resolving @dtpoff relocation.
2539    This is PT_TLS segment p_vaddr.  */
2540
2541 static bfd_vma
2542 elf64_x86_64_dtpoff_base (struct bfd_link_info *info)
2543 {
2544   /* If tls_sec is NULL, we should have signalled an error already.  */
2545   if (elf_hash_table (info)->tls_sec == NULL)
2546     return 0;
2547   return elf_hash_table (info)->tls_sec->vma;
2548 }
2549
2550 /* Return the relocation value for @tpoff relocation
2551    if STT_TLS virtual address is ADDRESS.  */
2552
2553 static bfd_vma
2554 elf64_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address)
2555 {
2556   struct elf_link_hash_table *htab = elf_hash_table (info);
2557
2558   /* If tls_segment is NULL, we should have signalled an error already.  */
2559   if (htab->tls_sec == NULL)
2560     return 0;
2561   return address - htab->tls_size - htab->tls_sec->vma;
2562 }
2563
2564 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
2565    branch?  */
2566
2567 static bfd_boolean
2568 is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset)
2569 {
2570   /* Opcode             Instruction
2571      0xe8               call
2572      0xe9               jump
2573      0x0f 0x8x          conditional jump */
2574   return ((offset > 0
2575            && (contents [offset - 1] == 0xe8
2576                || contents [offset - 1] == 0xe9))
2577           || (offset > 1
2578               && contents [offset - 2] == 0x0f
2579               && (contents [offset - 1] & 0xf0) == 0x80));
2580 }
2581
2582 static void
2583 elf64_x86_64_append_rela (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
2584 {
2585   bfd_byte *loc = s->contents;
2586   loc += s->reloc_count++ * sizeof (Elf64_External_Rela);
2587   BFD_ASSERT (loc + sizeof (Elf64_External_Rela)
2588               <= s->contents + s->size);
2589   bfd_elf64_swap_reloca_out (abfd, rel, loc);
2590 }
2591
2592 /* Relocate an x86_64 ELF section.  */
2593
2594 static bfd_boolean
2595 elf64_x86_64_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
2596                                bfd *input_bfd, asection *input_section,
2597                                bfd_byte *contents, Elf_Internal_Rela *relocs,
2598                                Elf_Internal_Sym *local_syms,
2599                                asection **local_sections)
2600 {
2601   struct elf64_x86_64_link_hash_table *htab;
2602   Elf_Internal_Shdr *symtab_hdr;
2603   struct elf_link_hash_entry **sym_hashes;
2604   bfd_vma *local_got_offsets;
2605   bfd_vma *local_tlsdesc_gotents;
2606   Elf_Internal_Rela *rel;
2607   Elf_Internal_Rela *relend;
2608
2609   BFD_ASSERT (is_x86_64_elf (input_bfd));
2610
2611   htab = elf64_x86_64_hash_table (info);
2612   if (htab == NULL)
2613     return FALSE;
2614   symtab_hdr = &elf_symtab_hdr (input_bfd);
2615   sym_hashes = elf_sym_hashes (input_bfd);
2616   local_got_offsets = elf_local_got_offsets (input_bfd);
2617   local_tlsdesc_gotents = elf64_x86_64_local_tlsdesc_gotent (input_bfd);
2618
2619   elf64_x86_64_set_tls_module_base (info);
2620
2621   rel = relocs;
2622   relend = relocs + input_section->reloc_count;
2623   for (; rel < relend; rel++)
2624     {
2625       unsigned int r_type;
2626       reloc_howto_type *howto;
2627       unsigned long r_symndx;
2628       struct elf_link_hash_entry *h;
2629       Elf_Internal_Sym *sym;
2630       asection *sec;
2631       bfd_vma off, offplt;
2632       bfd_vma relocation;
2633       bfd_boolean unresolved_reloc;
2634       bfd_reloc_status_type r;
2635       int tls_type;
2636       asection *base_got;
2637
2638       r_type = ELF64_R_TYPE (rel->r_info);
2639       if (r_type == (int) R_X86_64_GNU_VTINHERIT
2640           || r_type == (int) R_X86_64_GNU_VTENTRY)
2641         continue;
2642
2643       if (r_type >= R_X86_64_max)
2644         {
2645           bfd_set_error (bfd_error_bad_value);
2646           return FALSE;
2647         }
2648
2649       howto = x86_64_elf_howto_table + r_type;
2650       r_symndx = ELF64_R_SYM (rel->r_info);
2651       h = NULL;
2652       sym = NULL;
2653       sec = NULL;
2654       unresolved_reloc = FALSE;
2655       if (r_symndx < symtab_hdr->sh_info)
2656         {
2657           sym = local_syms + r_symndx;
2658           sec = local_sections[r_symndx];
2659
2660           relocation = _bfd_elf_rela_local_sym (output_bfd, sym,
2661                                                 &sec, rel);
2662
2663           /* Relocate against local STT_GNU_IFUNC symbol.  */
2664           if (!info->relocatable
2665               && ELF64_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2666             {
2667               h = elf64_x86_64_get_local_sym_hash (htab, input_bfd,
2668                                                    rel, FALSE);
2669               if (h == NULL)
2670                 abort ();
2671
2672               /* Set STT_GNU_IFUNC symbol value.  */
2673               h->root.u.def.value = sym->st_value;
2674               h->root.u.def.section = sec;
2675             }
2676         }
2677       else
2678         {
2679           bfd_boolean warned ATTRIBUTE_UNUSED;
2680
2681           RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2682                                    r_symndx, symtab_hdr, sym_hashes,
2683                                    h, sec, relocation,
2684                                    unresolved_reloc, warned);
2685         }
2686
2687       if (sec != NULL && elf_discarded_section (sec))
2688         RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
2689                                          rel, relend, howto, contents);
2690
2691       if (info->relocatable)
2692         continue;
2693
2694       /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2695          it here if it is defined in a non-shared object.  */
2696       if (h != NULL
2697           && h->type == STT_GNU_IFUNC
2698           && h->def_regular)
2699         {
2700           asection *plt;
2701           bfd_vma plt_index;
2702           const char *name;
2703
2704           if ((input_section->flags & SEC_ALLOC) == 0
2705               || h->plt.offset == (bfd_vma) -1)
2706             abort ();
2707
2708           /* STT_GNU_IFUNC symbol must go through PLT.  */
2709           plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
2710           relocation = (plt->output_section->vma
2711                         + plt->output_offset + h->plt.offset);
2712
2713           switch (r_type)
2714             {
2715             default:
2716               if (h->root.root.string)
2717                 name = h->root.root.string;
2718               else
2719                 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2720                                          NULL);
2721               (*_bfd_error_handler)
2722                 (_("%B: relocation %s against STT_GNU_IFUNC "
2723                    "symbol `%s' isn't handled by %s"), input_bfd,
2724                  x86_64_elf_howto_table[r_type].name,
2725                  name, __FUNCTION__);
2726               bfd_set_error (bfd_error_bad_value);
2727               return FALSE;
2728
2729             case R_X86_64_32S:
2730               if (info->shared)
2731                 abort ();
2732               goto do_relocation;
2733
2734             case R_X86_64_64:
2735               if (rel->r_addend != 0)
2736                 {
2737                   if (h->root.root.string)
2738                     name = h->root.root.string;
2739                   else
2740                     name = bfd_elf_sym_name (input_bfd, symtab_hdr,
2741                                              sym, NULL);
2742                   (*_bfd_error_handler)
2743                     (_("%B: relocation %s against STT_GNU_IFUNC "
2744                        "symbol `%s' has non-zero addend: %d"),
2745                      input_bfd, x86_64_elf_howto_table[r_type].name,
2746                      name, rel->r_addend);
2747                   bfd_set_error (bfd_error_bad_value);
2748                   return FALSE;
2749                 }
2750
2751               /* Generate dynamic relcoation only when there is a
2752                  non-GOF reference in a shared object.  */
2753               if (info->shared && h->non_got_ref)
2754                 {
2755                   Elf_Internal_Rela outrel;
2756                   asection *sreloc;
2757
2758                   /* Need a dynamic relocation to get the real function
2759                      address.  */
2760                   outrel.r_offset = _bfd_elf_section_offset (output_bfd,
2761                                                              info,
2762                                                              input_section,
2763                                                              rel->r_offset);
2764                   if (outrel.r_offset == (bfd_vma) -1
2765                       || outrel.r_offset == (bfd_vma) -2)
2766                     abort ();
2767
2768                   outrel.r_offset += (input_section->output_section->vma
2769                                       + input_section->output_offset);
2770
2771                   if (h->dynindx == -1
2772                       || h->forced_local
2773                       || info->executable)
2774                     {
2775                       /* This symbol is resolved locally.  */
2776                       outrel.r_info = ELF64_R_INFO (0, R_X86_64_IRELATIVE);
2777                       outrel.r_addend = (h->root.u.def.value
2778                                          + h->root.u.def.section->output_section->vma
2779                                          + h->root.u.def.section->output_offset);
2780                     }
2781                   else
2782                     {
2783                       outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
2784                       outrel.r_addend = 0;
2785                     }
2786
2787                   sreloc = htab->elf.irelifunc;
2788                   elf64_x86_64_append_rela (output_bfd, sreloc, &outrel);
2789
2790                   /* If this reloc is against an external symbol, we
2791                      do not want to fiddle with the addend.  Otherwise,
2792                      we need to include the symbol value so that it
2793                      becomes an addend for the dynamic reloc.  For an
2794                      internal symbol, we have updated addend.  */
2795                   continue;
2796                 }
2797
2798             case R_X86_64_32:
2799             case R_X86_64_PC32:
2800             case R_X86_64_PC64:
2801             case R_X86_64_PLT32:
2802               goto do_relocation;
2803
2804             case R_X86_64_GOTPCREL:
2805             case R_X86_64_GOTPCREL64:
2806               base_got = htab->elf.sgot;
2807               off = h->got.offset;
2808
2809               if (base_got == NULL)
2810                 abort ();
2811
2812               if (off == (bfd_vma) -1)
2813                 {
2814                   /* We can't use h->got.offset here to save state, or
2815                      even just remember the offset, as finish_dynamic_symbol
2816                      would use that as offset into .got.  */
2817
2818                   if (htab->elf.splt != NULL)
2819                     {
2820                       plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
2821                       off = (plt_index + 3) * GOT_ENTRY_SIZE;
2822                       base_got = htab->elf.sgotplt;
2823                     }
2824                   else
2825                     {
2826                       plt_index = h->plt.offset / PLT_ENTRY_SIZE;
2827                       off = plt_index * GOT_ENTRY_SIZE;
2828                       base_got = htab->elf.igotplt;
2829                     }
2830
2831                   if (h->dynindx == -1
2832                       || h->forced_local
2833                       || info->symbolic)
2834                     {
2835                       /* This references the local defitionion.  We must
2836                          initialize this entry in the global offset table.
2837                          Since the offset must always be a multiple of 8,
2838                          we use the least significant bit to record
2839                          whether we have initialized it already.
2840
2841                          When doing a dynamic link, we create a .rela.got
2842                          relocation entry to initialize the value.  This
2843                          is done in the finish_dynamic_symbol routine.   */
2844                       if ((off & 1) != 0)
2845                         off &= ~1;
2846                       else
2847                         {
2848                           bfd_put_64 (output_bfd, relocation,
2849                                       base_got->contents + off);
2850                           /* Note that this is harmless for the GOTPLT64
2851                              case, as -1 | 1 still is -1.  */
2852                           h->got.offset |= 1;
2853                         }
2854                     }
2855                 }
2856
2857               relocation = (base_got->output_section->vma
2858                             + base_got->output_offset + off);
2859
2860               if (r_type != R_X86_64_GOTPCREL
2861                   && r_type != R_X86_64_GOTPCREL64)
2862                 {
2863                   asection *gotplt;
2864                   if (htab->elf.splt != NULL)
2865                     gotplt = htab->elf.sgotplt;
2866                   else
2867                     gotplt = htab->elf.igotplt;
2868                   relocation -= (gotplt->output_section->vma
2869                                  - gotplt->output_offset);
2870                 }
2871
2872               goto do_relocation;
2873             }
2874         }
2875
2876       /* When generating a shared object, the relocations handled here are
2877          copied into the output file to be resolved at run time.  */
2878       switch (r_type)
2879         {
2880         case R_X86_64_GOT32:
2881         case R_X86_64_GOT64:
2882           /* Relocation is to the entry for this symbol in the global
2883              offset table.  */
2884         case R_X86_64_GOTPCREL:
2885         case R_X86_64_GOTPCREL64:
2886           /* Use global offset table entry as symbol value.  */
2887         case R_X86_64_GOTPLT64:
2888           /* This is the same as GOT64 for relocation purposes, but
2889              indicates the existence of a PLT entry.  The difficulty is,
2890              that we must calculate the GOT slot offset from the PLT
2891              offset, if this symbol got a PLT entry (it was global).
2892              Additionally if it's computed from the PLT entry, then that
2893              GOT offset is relative to .got.plt, not to .got.  */
2894           base_got = htab->elf.sgot;
2895
2896           if (htab->elf.sgot == NULL)
2897             abort ();
2898
2899           if (h != NULL)
2900             {
2901               bfd_boolean dyn;
2902
2903               off = h->got.offset;
2904               if (h->needs_plt
2905                   && h->plt.offset != (bfd_vma)-1
2906                   && off == (bfd_vma)-1)
2907                 {
2908                   /* We can't use h->got.offset here to save
2909                      state, or even just remember the offset, as
2910                      finish_dynamic_symbol would use that as offset into
2911                      .got.  */
2912                   bfd_vma plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
2913                   off = (plt_index + 3) * GOT_ENTRY_SIZE;
2914                   base_got = htab->elf.sgotplt;
2915                 }
2916
2917               dyn = htab->elf.dynamic_sections_created;
2918
2919               if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2920                   || (info->shared
2921                       && SYMBOL_REFERENCES_LOCAL (info, h))
2922                   || (ELF_ST_VISIBILITY (h->other)
2923                       && h->root.type == bfd_link_hash_undefweak))
2924                 {
2925                   /* This is actually a static link, or it is a -Bsymbolic
2926                      link and the symbol is defined locally, or the symbol
2927                      was forced to be local because of a version file.  We
2928                      must initialize this entry in the global offset table.
2929                      Since the offset must always be a multiple of 8, we
2930                      use the least significant bit to record whether we
2931                      have initialized it already.
2932
2933                      When doing a dynamic link, we create a .rela.got
2934                      relocation entry to initialize the value.  This is
2935                      done in the finish_dynamic_symbol routine.  */
2936                   if ((off & 1) != 0)
2937                     off &= ~1;
2938                   else
2939                     {
2940                       bfd_put_64 (output_bfd, relocation,
2941                                   base_got->contents + off);
2942                       /* Note that this is harmless for the GOTPLT64 case,
2943                          as -1 | 1 still is -1.  */
2944                       h->got.offset |= 1;
2945                     }
2946                 }
2947               else
2948                 unresolved_reloc = FALSE;
2949             }
2950           else
2951             {
2952               if (local_got_offsets == NULL)
2953                 abort ();
2954
2955               off = local_got_offsets[r_symndx];
2956
2957               /* The offset must always be a multiple of 8.  We use
2958                  the least significant bit to record whether we have
2959                  already generated the necessary reloc.  */
2960               if ((off & 1) != 0)
2961                 off &= ~1;
2962               else
2963                 {
2964                   bfd_put_64 (output_bfd, relocation,
2965                               base_got->contents + off);
2966
2967                   if (info->shared)
2968                     {
2969                       asection *s;
2970                       Elf_Internal_Rela outrel;
2971
2972                       /* We need to generate a R_X86_64_RELATIVE reloc
2973                          for the dynamic linker.  */
2974                       s = htab->elf.srelgot;
2975                       if (s == NULL)
2976                         abort ();
2977
2978                       outrel.r_offset = (base_got->output_section->vma
2979                                          + base_got->output_offset
2980                                          + off);
2981                       outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
2982                       outrel.r_addend = relocation;
2983                       elf64_x86_64_append_rela (output_bfd, s, &outrel);
2984                     }
2985
2986                   local_got_offsets[r_symndx] |= 1;
2987                 }
2988             }
2989
2990           if (off >= (bfd_vma) -2)
2991             abort ();
2992
2993           relocation = base_got->output_section->vma
2994                        + base_got->output_offset + off;
2995           if (r_type != R_X86_64_GOTPCREL && r_type != R_X86_64_GOTPCREL64)
2996             relocation -= htab->elf.sgotplt->output_section->vma
2997                           - htab->elf.sgotplt->output_offset;
2998
2999           break;
3000
3001         case R_X86_64_GOTOFF64:
3002           /* Relocation is relative to the start of the global offset
3003              table.  */
3004
3005           /* Check to make sure it isn't a protected function symbol
3006              for shared library since it may not be local when used
3007              as function address.  */
3008           if (info->shared
3009               && h
3010               && h->def_regular
3011               && h->type == STT_FUNC
3012               && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3013             {
3014               (*_bfd_error_handler)
3015                 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
3016                  input_bfd, h->root.root.string);
3017               bfd_set_error (bfd_error_bad_value);
3018               return FALSE;
3019             }
3020
3021           /* Note that sgot is not involved in this
3022              calculation.  We always want the start of .got.plt.  If we
3023              defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3024              permitted by the ABI, we might have to change this
3025              calculation.  */
3026           relocation -= htab->elf.sgotplt->output_section->vma
3027                         + htab->elf.sgotplt->output_offset;
3028           break;
3029
3030         case R_X86_64_GOTPC32:
3031         case R_X86_64_GOTPC64:
3032           /* Use global offset table as symbol value.  */
3033           relocation = htab->elf.sgotplt->output_section->vma
3034                        + htab->elf.sgotplt->output_offset;
3035           unresolved_reloc = FALSE;
3036           break;
3037
3038         case R_X86_64_PLTOFF64:
3039           /* Relocation is PLT entry relative to GOT.  For local
3040              symbols it's the symbol itself relative to GOT.  */
3041           if (h != NULL
3042               /* See PLT32 handling.  */
3043               && h->plt.offset != (bfd_vma) -1
3044               && htab->elf.splt != NULL)
3045             {
3046               relocation = (htab->elf.splt->output_section->vma
3047                             + htab->elf.splt->output_offset
3048                             + h->plt.offset);
3049               unresolved_reloc = FALSE;
3050             }
3051
3052           relocation -= htab->elf.sgotplt->output_section->vma
3053                         + htab->elf.sgotplt->output_offset;
3054           break;
3055
3056         case R_X86_64_PLT32:
3057           /* Relocation is to the entry for this symbol in the
3058              procedure linkage table.  */
3059
3060           /* Resolve a PLT32 reloc against a local symbol directly,
3061              without using the procedure linkage table.  */
3062           if (h == NULL)
3063             break;
3064
3065           if (h->plt.offset == (bfd_vma) -1
3066               || htab->elf.splt == NULL)
3067             {
3068               /* We didn't make a PLT entry for this symbol.  This
3069                  happens when statically linking PIC code, or when
3070                  using -Bsymbolic.  */
3071               break;
3072             }
3073
3074           relocation = (htab->elf.splt->output_section->vma
3075                         + htab->elf.splt->output_offset
3076                         + h->plt.offset);
3077           unresolved_reloc = FALSE;
3078           break;
3079
3080         case R_X86_64_PC8:
3081         case R_X86_64_PC16:
3082         case R_X86_64_PC32:
3083           if (info->shared
3084               && (input_section->flags & SEC_ALLOC) != 0
3085               && (input_section->flags & SEC_READONLY) != 0
3086               && h != NULL)
3087             {
3088               bfd_boolean fail = FALSE;
3089               bfd_boolean branch
3090                 = (r_type == R_X86_64_PC32
3091                    && is_32bit_relative_branch (contents, rel->r_offset));
3092
3093               if (SYMBOL_REFERENCES_LOCAL (info, h))
3094                 {
3095                   /* Symbol is referenced locally.  Make sure it is
3096                      defined locally or for a branch.  */
3097                   fail = !h->def_regular && !branch;
3098                 }
3099               else
3100                 {
3101                   /* Symbol isn't referenced locally.  We only allow
3102                      branch to symbol with non-default visibility. */
3103                   fail = (!branch
3104                           || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT);
3105                 }
3106
3107               if (fail)
3108                 {
3109                   const char *fmt;
3110                   const char *v;
3111                   const char *pic = "";
3112
3113                   switch (ELF_ST_VISIBILITY (h->other))
3114                     {
3115                     case STV_HIDDEN:
3116                       v = _("hidden symbol");
3117                       break;
3118                     case STV_INTERNAL:
3119                       v = _("internal symbol");
3120                       break;
3121                     case STV_PROTECTED:
3122                       v = _("protected symbol");
3123                       break;
3124                     default:
3125                       v = _("symbol");
3126                       pic = _("; recompile with -fPIC");
3127                       break;
3128                     }
3129
3130                   if (h->def_regular)
3131                     fmt = _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
3132                   else
3133                     fmt = _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
3134
3135                   (*_bfd_error_handler) (fmt, input_bfd,
3136                                          x86_64_elf_howto_table[r_type].name,
3137                                          v,  h->root.root.string, pic);
3138                   bfd_set_error (bfd_error_bad_value);
3139                   return FALSE;
3140                 }
3141             }
3142           /* Fall through.  */
3143
3144         case R_X86_64_8:
3145         case R_X86_64_16:
3146         case R_X86_64_32:
3147         case R_X86_64_PC64:
3148         case R_X86_64_64:
3149           /* FIXME: The ABI says the linker should make sure the value is
3150              the same when it's zeroextended to 64 bit.  */
3151
3152           if ((input_section->flags & SEC_ALLOC) == 0)
3153             break;
3154
3155           if ((info->shared
3156                && (h == NULL
3157                    || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3158                    || h->root.type != bfd_link_hash_undefweak)
3159                && (! IS_X86_64_PCREL_TYPE (r_type)
3160                    || ! SYMBOL_CALLS_LOCAL (info, h)))
3161               || (ELIMINATE_COPY_RELOCS
3162                   && !info->shared
3163                   && h != NULL
3164                   && h->dynindx != -1
3165                   && !h->non_got_ref
3166                   && ((h->def_dynamic
3167                        && !h->def_regular)
3168                       || h->root.type == bfd_link_hash_undefweak
3169                       || h->root.type == bfd_link_hash_undefined)))
3170             {
3171               Elf_Internal_Rela outrel;
3172               bfd_boolean skip, relocate;
3173               asection *sreloc;
3174
3175               /* When generating a shared object, these relocations
3176                  are copied into the output file to be resolved at run
3177                  time.  */
3178               skip = FALSE;
3179               relocate = FALSE;
3180
3181               outrel.r_offset =
3182                 _bfd_elf_section_offset (output_bfd, info, input_section,
3183                                          rel->r_offset);
3184               if (outrel.r_offset == (bfd_vma) -1)
3185                 skip = TRUE;
3186               else if (outrel.r_offset == (bfd_vma) -2)
3187                 skip = TRUE, relocate = TRUE;
3188
3189               outrel.r_offset += (input_section->output_section->vma
3190                                   + input_section->output_offset);
3191
3192               if (skip)
3193                 memset (&outrel, 0, sizeof outrel);
3194
3195               /* h->dynindx may be -1 if this symbol was marked to
3196                  become local.  */
3197               else if (h != NULL
3198                        && h->dynindx != -1
3199                        && (IS_X86_64_PCREL_TYPE (r_type)
3200                            || ! info->shared
3201                            || ! SYMBOLIC_BIND (info, h)
3202                            || ! h->def_regular))
3203                 {
3204                   outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
3205                   outrel.r_addend = rel->r_addend;
3206                 }
3207               else
3208                 {
3209                   /* This symbol is local, or marked to become local.  */
3210                   if (r_type == R_X86_64_64)
3211                     {
3212                       relocate = TRUE;
3213                       outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
3214                       outrel.r_addend = relocation + rel->r_addend;
3215                     }
3216                   else
3217                     {
3218                       long sindx;
3219
3220                       if (bfd_is_abs_section (sec))
3221                         sindx = 0;
3222                       else if (sec == NULL || sec->owner == NULL)
3223                         {
3224                           bfd_set_error (bfd_error_bad_value);
3225                           return FALSE;
3226                         }
3227                       else
3228                         {
3229                           asection *osec;
3230
3231                           /* We are turning this relocation into one
3232                              against a section symbol.  It would be
3233                              proper to subtract the symbol's value,
3234                              osec->vma, from the emitted reloc addend,
3235                              but ld.so expects buggy relocs.  */
3236                           osec = sec->output_section;
3237                           sindx = elf_section_data (osec)->dynindx;
3238                           if (sindx == 0)
3239                             {
3240                               asection *oi = htab->elf.text_index_section;
3241                               sindx = elf_section_data (oi)->dynindx;
3242                             }
3243                           BFD_ASSERT (sindx != 0);
3244                         }
3245
3246                       outrel.r_info = ELF64_R_INFO (sindx, r_type);
3247                       outrel.r_addend = relocation + rel->r_addend;
3248                     }
3249                 }
3250
3251               sreloc = elf_section_data (input_section)->sreloc;
3252
3253               BFD_ASSERT (sreloc != NULL && sreloc->contents != NULL);
3254
3255               elf64_x86_64_append_rela (output_bfd, sreloc, &outrel);
3256
3257               /* If this reloc is against an external symbol, we do
3258                  not want to fiddle with the addend.  Otherwise, we
3259                  need to include the symbol value so that it becomes
3260                  an addend for the dynamic reloc.  */
3261               if (! relocate)
3262                 continue;
3263             }
3264
3265           break;
3266
3267         case R_X86_64_TLSGD:
3268         case R_X86_64_GOTPC32_TLSDESC:
3269         case R_X86_64_TLSDESC_CALL:
3270         case R_X86_64_GOTTPOFF:
3271           tls_type = GOT_UNKNOWN;
3272           if (h == NULL && local_got_offsets)
3273             tls_type = elf64_x86_64_local_got_tls_type (input_bfd) [r_symndx];
3274           else if (h != NULL)
3275             tls_type = elf64_x86_64_hash_entry (h)->tls_type;
3276
3277           if (! elf64_x86_64_tls_transition (info, input_bfd,
3278                                              input_section, contents,
3279                                              symtab_hdr, sym_hashes,
3280                                              &r_type, tls_type, rel,
3281                                              relend, h, r_symndx))
3282             return FALSE;
3283
3284           if (r_type == R_X86_64_TPOFF32)
3285             {
3286               bfd_vma roff = rel->r_offset;
3287
3288               BFD_ASSERT (! unresolved_reloc);
3289
3290               if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
3291                 {
3292                   /* GD->LE transition.
3293                      .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3294                      .word 0x6666; rex64; call __tls_get_addr
3295                      Change it into:
3296                      movq %fs:0, %rax
3297                      leaq foo@tpoff(%rax), %rax */
3298                   memcpy (contents + roff - 4,
3299                           "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3300                           16);
3301                   bfd_put_32 (output_bfd,
3302                               elf64_x86_64_tpoff (info, relocation),
3303                               contents + roff + 8);
3304                   /* Skip R_X86_64_PC32/R_X86_64_PLT32.  */
3305                   rel++;
3306                   continue;
3307                 }
3308               else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
3309                 {
3310                   /* GDesc -> LE transition.
3311                      It's originally something like:
3312                      leaq x@tlsdesc(%rip), %rax
3313
3314                      Change it to:
3315                      movl $x@tpoff, %rax.  */
3316
3317                   unsigned int val, type;
3318
3319                   type = bfd_get_8 (input_bfd, contents + roff - 3);
3320                   val = bfd_get_8 (input_bfd, contents + roff - 1);
3321                   bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1),
3322                              contents + roff - 3);
3323                   bfd_put_8 (output_bfd, 0xc7, contents + roff - 2);
3324                   bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3325                              contents + roff - 1);
3326                   bfd_put_32 (output_bfd,
3327                               elf64_x86_64_tpoff (info, relocation),
3328                               contents + roff);
3329                   continue;
3330                 }
3331               else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
3332                 {
3333                   /* GDesc -> LE transition.
3334                      It's originally:
3335                      call *(%rax)
3336                      Turn it into:
3337                      xchg %ax,%ax.  */
3338                   bfd_put_8 (output_bfd, 0x66, contents + roff);
3339                   bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3340                   continue;
3341                 }
3342               else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF)
3343                 {
3344                   /* IE->LE transition:
3345                      Originally it can be one of:
3346                      movq foo@gottpoff(%rip), %reg
3347                      addq foo@gottpoff(%rip), %reg
3348                      We change it into:
3349                      movq $foo, %reg
3350                      leaq foo(%reg), %reg
3351                      addq $foo, %reg.  */
3352
3353                   unsigned int val, type, reg;
3354
3355                   val = bfd_get_8 (input_bfd, contents + roff - 3);
3356                   type = bfd_get_8 (input_bfd, contents + roff - 2);
3357                   reg = bfd_get_8 (input_bfd, contents + roff - 1);
3358                   reg >>= 3;
3359                   if (type == 0x8b)
3360                     {
3361                       /* movq */
3362                       if (val == 0x4c)
3363                         bfd_put_8 (output_bfd, 0x49,
3364                                    contents + roff - 3);
3365                       bfd_put_8 (output_bfd, 0xc7,
3366                                  contents + roff - 2);
3367                       bfd_put_8 (output_bfd, 0xc0 | reg,
3368                                  contents + roff - 1);
3369                     }
3370                   else if (reg == 4)
3371                     {
3372                       /* addq -> addq - addressing with %rsp/%r12 is
3373                          special  */
3374                       if (val == 0x4c)
3375                         bfd_put_8 (output_bfd, 0x49,
3376                                    contents + roff - 3);
3377                       bfd_put_8 (output_bfd, 0x81,
3378                                  contents + roff - 2);
3379                       bfd_put_8 (output_bfd, 0xc0 | reg,
3380                                  contents + roff - 1);
3381                     }
3382                   else
3383                     {
3384                       /* addq -> leaq */
3385                       if (val == 0x4c)
3386                         bfd_put_8 (output_bfd, 0x4d,
3387                                    contents + roff - 3);
3388                       bfd_put_8 (output_bfd, 0x8d,
3389                                  contents + roff - 2);
3390                       bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
3391                                  contents + roff - 1);
3392                     }
3393                   bfd_put_32 (output_bfd,
3394                               elf64_x86_64_tpoff (info, relocation),
3395                               contents + roff);
3396                   continue;
3397                 }
3398               else
3399                 BFD_ASSERT (FALSE);
3400             }
3401
3402           if (htab->elf.sgot == NULL)
3403             abort ();
3404
3405           if (h != NULL)
3406             {
3407               off = h->got.offset;
3408               offplt = elf64_x86_64_hash_entry (h)->tlsdesc_got;
3409             }
3410           else
3411             {
3412               if (local_got_offsets == NULL)
3413                 abort ();
3414
3415               off = local_got_offsets[r_symndx];
3416               offplt = local_tlsdesc_gotents[r_symndx];
3417             }
3418
3419           if ((off & 1) != 0)
3420             off &= ~1;
3421           else
3422             {
3423               Elf_Internal_Rela outrel;
3424               int dr_type, indx;
3425               asection *sreloc;
3426
3427               if (htab->elf.srelgot == NULL)
3428                 abort ();
3429
3430               indx = h && h->dynindx != -1 ? h->dynindx : 0;
3431
3432               if (GOT_TLS_GDESC_P (tls_type))
3433                 {
3434                   outrel.r_info = ELF64_R_INFO (indx, R_X86_64_TLSDESC);
3435                   BFD_ASSERT (htab->sgotplt_jump_table_size + offplt
3436                               + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size);
3437                   outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3438                                      + htab->elf.sgotplt->output_offset
3439                                      + offplt
3440                                      + htab->sgotplt_jump_table_size);
3441                   sreloc = htab->elf.srelplt;
3442                   if (indx == 0)
3443                     outrel.r_addend = relocation - elf64_x86_64_dtpoff_base (info);
3444                   else
3445                     outrel.r_addend = 0;
3446                   elf64_x86_64_append_rela (output_bfd, sreloc, &outrel);
3447                 }
3448
3449               sreloc = htab->elf.srelgot;
3450
3451               outrel.r_offset = (htab->elf.sgot->output_section->vma
3452                                  + htab->elf.sgot->output_offset + off);
3453
3454               if (GOT_TLS_GD_P (tls_type))
3455                 dr_type = R_X86_64_DTPMOD64;
3456               else if (GOT_TLS_GDESC_P (tls_type))
3457                 goto dr_done;
3458               else
3459                 dr_type = R_X86_64_TPOFF64;
3460
3461               bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off);
3462               outrel.r_addend = 0;
3463               if ((dr_type == R_X86_64_TPOFF64
3464                    || dr_type == R_X86_64_TLSDESC) && indx == 0)
3465                 outrel.r_addend = relocation - elf64_x86_64_dtpoff_base (info);
3466               outrel.r_info = ELF64_R_INFO (indx, dr_type);
3467
3468               elf64_x86_64_append_rela (output_bfd, sreloc, &outrel);
3469
3470               if (GOT_TLS_GD_P (tls_type))
3471                 {
3472                   if (indx == 0)
3473                     {
3474                       BFD_ASSERT (! unresolved_reloc);
3475                       bfd_put_64 (output_bfd,
3476                                   relocation - elf64_x86_64_dtpoff_base (info),
3477                                   htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3478                     }
3479                   else
3480                     {
3481                       bfd_put_64 (output_bfd, 0,
3482                                   htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3483                       outrel.r_info = ELF64_R_INFO (indx,
3484                                                     R_X86_64_DTPOFF64);
3485                       outrel.r_offset += GOT_ENTRY_SIZE;
3486                       elf64_x86_64_append_rela (output_bfd, sreloc,
3487                                                 &outrel);
3488                     }
3489                 }
3490
3491             dr_done:
3492               if (h != NULL)
3493                 h->got.offset |= 1;
3494               else
3495                 local_got_offsets[r_symndx] |= 1;
3496             }
3497
3498           if (off >= (bfd_vma) -2
3499               && ! GOT_TLS_GDESC_P (tls_type))
3500             abort ();
3501           if (r_type == ELF64_R_TYPE (rel->r_info))
3502             {
3503               if (r_type == R_X86_64_GOTPC32_TLSDESC
3504                   || r_type == R_X86_64_TLSDESC_CALL)
3505                 relocation = htab->elf.sgotplt->output_section->vma
3506                   + htab->elf.sgotplt->output_offset
3507                   + offplt + htab->sgotplt_jump_table_size;
3508               else
3509                 relocation = htab->elf.sgot->output_section->vma
3510                   + htab->elf.sgot->output_offset + off;
3511               unresolved_reloc = FALSE;
3512             }
3513           else
3514             {
3515               bfd_vma roff = rel->r_offset;
3516
3517               if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
3518                 {
3519                   /* GD->IE transition.
3520                      .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3521                      .word 0x6666; rex64; call __tls_get_addr@plt
3522                      Change it into:
3523                      movq %fs:0, %rax
3524                      addq foo@gottpoff(%rip), %rax */
3525                   memcpy (contents + roff - 4,
3526                           "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
3527                           16);
3528
3529                   relocation = (htab->elf.sgot->output_section->vma
3530                                 + htab->elf.sgot->output_offset + off
3531                                 - roff
3532                                 - input_section->output_section->vma
3533                                 - input_section->output_offset
3534                                 - 12);
3535                   bfd_put_32 (output_bfd, relocation,
3536                               contents + roff + 8);
3537                   /* Skip R_X86_64_PLT32.  */
3538                   rel++;
3539                   continue;
3540                 }
3541               else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
3542                 {
3543                   /* GDesc -> IE transition.
3544                      It's originally something like:
3545                      leaq x@tlsdesc(%rip), %rax
3546
3547                      Change it to:
3548                      movq x@gottpoff(%rip), %rax # before xchg %ax,%ax.  */
3549
3550                   /* Now modify the instruction as appropriate. To
3551                      turn a leaq into a movq in the form we use it, it
3552                      suffices to change the second byte from 0x8d to
3553                      0x8b.  */
3554                   bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3555
3556                   bfd_put_32 (output_bfd,
3557                               htab->elf.sgot->output_section->vma
3558                               + htab->elf.sgot->output_offset + off
3559                               - rel->r_offset
3560                               - input_section->output_section->vma
3561                               - input_section->output_offset
3562                               - 4,
3563                               contents + roff);
3564                   continue;
3565                 }
3566               else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
3567                 {
3568                   /* GDesc -> IE transition.
3569                      It's originally:
3570                      call *(%rax)
3571
3572                      Change it to:
3573                      xchg %ax, %ax.  */
3574
3575                   bfd_put_8 (output_bfd, 0x66, contents + roff);
3576                   bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3577                   continue;
3578                 }
3579               else
3580                 BFD_ASSERT (FALSE);
3581             }
3582           break;
3583
3584         case R_X86_64_TLSLD:
3585           if (! elf64_x86_64_tls_transition (info, input_bfd,
3586                                              input_section, contents,
3587                                              symtab_hdr, sym_hashes,
3588                                              &r_type, GOT_UNKNOWN,
3589                                              rel, relend, h, r_symndx))
3590             return FALSE;
3591
3592           if (r_type != R_X86_64_TLSLD)
3593             {
3594               /* LD->LE transition:
3595                  leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
3596                  We change it into:
3597                  .word 0x6666; .byte 0x66; movl %fs:0, %rax.  */
3598
3599               BFD_ASSERT (r_type == R_X86_64_TPOFF32);
3600               memcpy (contents + rel->r_offset - 3,
3601                       "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
3602               /* Skip R_X86_64_PC32/R_X86_64_PLT32.  */
3603               rel++;
3604               continue;
3605             }
3606
3607           if (htab->elf.sgot == NULL)
3608             abort ();
3609
3610           off = htab->tls_ld_got.offset;
3611           if (off & 1)
3612             off &= ~1;
3613           else
3614             {
3615               Elf_Internal_Rela outrel;
3616
3617               if (htab->elf.srelgot == NULL)
3618                 abort ();
3619
3620               outrel.r_offset = (htab->elf.sgot->output_section->vma
3621                                  + htab->elf.sgot->output_offset + off);
3622
3623               bfd_put_64 (output_bfd, 0,
3624                           htab->elf.sgot->contents + off);
3625               bfd_put_64 (output_bfd, 0,
3626                           htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3627               outrel.r_info = ELF64_R_INFO (0, R_X86_64_DTPMOD64);
3628               outrel.r_addend = 0;
3629               elf64_x86_64_append_rela (output_bfd, htab->elf.srelgot,
3630                                         &outrel);
3631               htab->tls_ld_got.offset |= 1;
3632             }
3633           relocation = htab->elf.sgot->output_section->vma
3634                        + htab->elf.sgot->output_offset + off;
3635           unresolved_reloc = FALSE;
3636           break;
3637
3638         case R_X86_64_DTPOFF32:
3639           if (!info->executable|| (input_section->flags & SEC_CODE) == 0)
3640             relocation -= elf64_x86_64_dtpoff_base (info);
3641           else
3642             relocation = elf64_x86_64_tpoff (info, relocation);
3643           break;
3644
3645         case R_X86_64_TPOFF32:
3646           BFD_ASSERT (info->executable);
3647           relocation = elf64_x86_64_tpoff (info, relocation);
3648           break;
3649
3650         default:
3651           break;
3652         }
3653
3654       /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3655          because such sections are not SEC_ALLOC and thus ld.so will
3656          not process them.  */
3657       if (unresolved_reloc
3658           && !((input_section->flags & SEC_DEBUGGING) != 0
3659                && h->def_dynamic))
3660         (*_bfd_error_handler)
3661           (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3662            input_bfd,
3663            input_section,
3664            (long) rel->r_offset,
3665            howto->name,
3666            h->root.root.string);
3667
3668 do_relocation:
3669       r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3670                                     contents, rel->r_offset,
3671                                     relocation, rel->r_addend);
3672
3673       if (r != bfd_reloc_ok)
3674         {
3675           const char *name;
3676
3677           if (h != NULL)
3678             name = h->root.root.string;
3679           else
3680             {
3681               name = bfd_elf_string_from_elf_section (input_bfd,
3682                                                       symtab_hdr->sh_link,
3683                                                       sym->st_name);
3684               if (name == NULL)
3685                 return FALSE;
3686               if (*name == '\0')
3687                 name = bfd_section_name (input_bfd, sec);
3688             }
3689
3690           if (r == bfd_reloc_overflow)
3691             {
3692               if (! ((*info->callbacks->reloc_overflow)
3693                      (info, (h ? &h->root : NULL), name, howto->name,
3694                       (bfd_vma) 0, input_bfd, input_section,
3695                       rel->r_offset)))
3696                 return FALSE;
3697             }
3698           else
3699             {
3700               (*_bfd_error_handler)
3701                 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3702                  input_bfd, input_section,
3703                  (long) rel->r_offset, name, (int) r);
3704               return FALSE;
3705             }
3706         }
3707     }
3708
3709   return TRUE;
3710 }
3711
3712 /* Finish up dynamic symbol handling.  We set the contents of various
3713    dynamic sections here.  */
3714
3715 static bfd_boolean
3716 elf64_x86_64_finish_dynamic_symbol (bfd *output_bfd,
3717                                     struct bfd_link_info *info,
3718                                     struct elf_link_hash_entry *h,
3719                                     Elf_Internal_Sym *sym)
3720 {
3721   struct elf64_x86_64_link_hash_table *htab;
3722
3723   htab = elf64_x86_64_hash_table (info);
3724   if (htab == NULL)
3725     return FALSE;
3726
3727   if (h->plt.offset != (bfd_vma) -1)
3728     {
3729       bfd_vma plt_index;
3730       bfd_vma got_offset;
3731       Elf_Internal_Rela rela;
3732       bfd_byte *loc;
3733       asection *plt, *gotplt, *relplt;
3734
3735       /* When building a static executable, use .iplt, .igot.plt and
3736          .rela.iplt sections for STT_GNU_IFUNC symbols.  */
3737       if (htab->elf.splt != NULL)
3738         {
3739           plt = htab->elf.splt;
3740           gotplt = htab->elf.sgotplt;
3741           relplt = htab->elf.srelplt;
3742         }
3743       else
3744         {
3745           plt = htab->elf.iplt;
3746           gotplt = htab->elf.igotplt;
3747           relplt = htab->elf.irelplt;
3748         }
3749
3750       /* This symbol has an entry in the procedure linkage table.  Set
3751          it up.  */
3752       if ((h->dynindx == -1
3753            && !((h->forced_local || info->executable)
3754                 && h->def_regular
3755                 && h->type == STT_GNU_IFUNC))
3756           || plt == NULL
3757           || gotplt == NULL
3758           || relplt == NULL)
3759         abort ();
3760
3761       /* Get the index in the procedure linkage table which
3762          corresponds to this symbol.  This is the index of this symbol
3763          in all the symbols for which we are making plt entries.  The
3764          first entry in the procedure linkage table is reserved.
3765
3766          Get the offset into the .got table of the entry that
3767          corresponds to this function.  Each .got entry is GOT_ENTRY_SIZE
3768          bytes. The first three are reserved for the dynamic linker.
3769
3770          For static executables, we don't reserve anything.  */
3771
3772       if (plt == htab->elf.splt)
3773         {
3774           plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
3775           got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3776         }
3777       else
3778         {
3779           plt_index = h->plt.offset / PLT_ENTRY_SIZE;
3780           got_offset = plt_index * GOT_ENTRY_SIZE;
3781         }
3782
3783       /* Fill in the entry in the procedure linkage table.  */
3784       memcpy (plt->contents + h->plt.offset, elf64_x86_64_plt_entry,
3785               PLT_ENTRY_SIZE);
3786
3787       /* Insert the relocation positions of the plt section.  The magic
3788          numbers at the end of the statements are the positions of the
3789          relocations in the plt section.  */
3790       /* Put offset for jmp *name@GOTPCREL(%rip), since the
3791          instruction uses 6 bytes, subtract this value.  */
3792       bfd_put_32 (output_bfd,
3793                       (gotplt->output_section->vma
3794                        + gotplt->output_offset
3795                        + got_offset
3796                        - plt->output_section->vma
3797                        - plt->output_offset
3798                        - h->plt.offset
3799                        - 6),
3800                   plt->contents + h->plt.offset + 2);
3801
3802       /* Don't fill PLT entry for static executables.  */
3803       if (plt == htab->elf.splt)
3804         {
3805           /* Put relocation index.  */
3806           bfd_put_32 (output_bfd, plt_index,
3807                       plt->contents + h->plt.offset + 7);
3808           /* Put offset for jmp .PLT0.  */
3809           bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
3810                       plt->contents + h->plt.offset + 12);
3811         }
3812
3813       /* Fill in the entry in the global offset table, initially this
3814          points to the pushq instruction in the PLT which is at offset 6.  */
3815       bfd_put_64 (output_bfd, (plt->output_section->vma
3816                                + plt->output_offset
3817                                + h->plt.offset + 6),
3818                   gotplt->contents + got_offset);
3819
3820       /* Fill in the entry in the .rela.plt section.  */
3821       rela.r_offset = (gotplt->output_section->vma
3822                        + gotplt->output_offset
3823                        + got_offset);
3824       if (h->dynindx == -1
3825           || ((info->executable
3826                || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
3827               && h->def_regular
3828               && h->type == STT_GNU_IFUNC))
3829         {
3830           /* If an STT_GNU_IFUNC symbol is locally defined, generate
3831              R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT.  */
3832           rela.r_info = ELF64_R_INFO (0, R_X86_64_IRELATIVE);
3833           rela.r_addend = (h->root.u.def.value
3834                            + h->root.u.def.section->output_section->vma
3835                            + h->root.u.def.section->output_offset);
3836         }
3837       else
3838         {
3839           rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_JUMP_SLOT);
3840           rela.r_addend = 0;
3841         }
3842       loc = relplt->contents + plt_index * sizeof (Elf64_External_Rela);
3843       bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3844
3845       if (!h->def_regular)
3846         {
3847           /* Mark the symbol as undefined, rather than as defined in
3848              the .plt section.  Leave the value if there were any
3849              relocations where pointer equality matters (this is a clue
3850              for the dynamic linker, to make function pointer
3851              comparisons work between an application and shared
3852              library), otherwise set it to zero.  If a function is only
3853              called from a binary, there is no need to slow down
3854              shared libraries because of that.  */
3855           sym->st_shndx = SHN_UNDEF;
3856           if (!h->pointer_equality_needed)
3857             sym->st_value = 0;
3858         }
3859     }
3860
3861   if (h->got.offset != (bfd_vma) -1
3862       && ! GOT_TLS_GD_ANY_P (elf64_x86_64_hash_entry (h)->tls_type)
3863       && elf64_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE)
3864     {
3865       Elf_Internal_Rela rela;
3866
3867       /* This symbol has an entry in the global offset table.  Set it
3868          up.  */
3869       if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3870         abort ();
3871
3872       rela.r_offset = (htab->elf.sgot->output_section->vma
3873                        + htab->elf.sgot->output_offset
3874                        + (h->got.offset &~ (bfd_vma) 1));
3875
3876       /* If this is a static link, or it is a -Bsymbolic link and the
3877          symbol is defined locally or was forced to be local because
3878          of a version file, we just want to emit a RELATIVE reloc.
3879          The entry in the global offset table will already have been
3880          initialized in the relocate_section function.  */
3881       if (h->def_regular
3882           && h->type == STT_GNU_IFUNC)
3883         {
3884           if (info->shared)
3885             {
3886               /* Generate R_X86_64_GLOB_DAT.  */
3887               goto do_glob_dat;
3888             }
3889           else
3890             {
3891               asection *plt;
3892
3893               if (!h->pointer_equality_needed)
3894                 abort ();
3895
3896               /* For non-shared object, we can't use .got.plt, which
3897                  contains the real function addres if we need pointer
3898                  equality.  We load the GOT entry with the PLT entry.  */
3899               plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
3900               bfd_put_64 (output_bfd, (plt->output_section->vma
3901                                        + plt->output_offset
3902                                        + h->plt.offset),
3903                           htab->elf.sgot->contents + h->got.offset);
3904               return TRUE;
3905             }
3906         }
3907       else if (info->shared
3908                && SYMBOL_REFERENCES_LOCAL (info, h))
3909         {
3910           if (!h->def_regular)
3911             return FALSE;
3912           BFD_ASSERT((h->got.offset & 1) != 0);
3913           rela.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
3914           rela.r_addend = (h->root.u.def.value
3915                            + h->root.u.def.section->output_section->vma
3916                            + h->root.u.def.section->output_offset);
3917         }
3918       else
3919         {
3920           BFD_ASSERT((h->got.offset & 1) == 0);
3921 do_glob_dat:
3922           bfd_put_64 (output_bfd, (bfd_vma) 0,
3923                       htab->elf.sgot->contents + h->got.offset);
3924           rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_GLOB_DAT);
3925           rela.r_addend = 0;
3926         }
3927
3928       elf64_x86_64_append_rela (output_bfd, htab->elf.srelgot, &rela);
3929     }
3930
3931   if (h->needs_copy)
3932     {
3933       Elf_Internal_Rela rela;
3934
3935       /* This symbol needs a copy reloc.  Set it up.  */
3936
3937       if (h->dynindx == -1
3938           || (h->root.type != bfd_link_hash_defined
3939               && h->root.type != bfd_link_hash_defweak)
3940           || htab->srelbss == NULL)
3941         abort ();
3942
3943       rela.r_offset = (h->root.u.def.value
3944                        + h->root.u.def.section->output_section->vma
3945                        + h->root.u.def.section->output_offset);
3946       rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_COPY);
3947       rela.r_addend = 0;
3948       elf64_x86_64_append_rela (output_bfd, htab->srelbss, &rela);
3949     }
3950
3951   /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute.  SYM may
3952      be NULL for local symbols.  */
3953   if (sym != NULL
3954       && (strcmp (h->root.root.string, "_DYNAMIC") == 0
3955           || h == htab->elf.hgot))
3956     sym->st_shndx = SHN_ABS;
3957
3958   return TRUE;
3959 }
3960
3961 /* Finish up local dynamic symbol handling.  We set the contents of
3962    various dynamic sections here.  */
3963
3964 static bfd_boolean
3965 elf64_x86_64_finish_local_dynamic_symbol (void **slot, void *inf)
3966 {
3967   struct elf_link_hash_entry *h
3968     = (struct elf_link_hash_entry *) *slot;
3969   struct bfd_link_info *info
3970     = (struct bfd_link_info *) inf;
3971
3972   return elf64_x86_64_finish_dynamic_symbol (info->output_bfd,
3973                                              info, h, NULL);
3974 }
3975
3976 /* Used to decide how to sort relocs in an optimal manner for the
3977    dynamic linker, before writing them out.  */
3978
3979 static enum elf_reloc_type_class
3980 elf64_x86_64_reloc_type_class (const Elf_Internal_Rela *rela)
3981 {
3982   switch ((int) ELF64_R_TYPE (rela->r_info))
3983     {
3984     case R_X86_64_RELATIVE:
3985       return reloc_class_relative;
3986     case R_X86_64_JUMP_SLOT:
3987       return reloc_class_plt;
3988     case R_X86_64_COPY:
3989       return reloc_class_copy;
3990     default:
3991       return reloc_class_normal;
3992     }
3993 }
3994
3995 /* Finish up the dynamic sections.  */
3996
3997 static bfd_boolean
3998 elf64_x86_64_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
3999 {
4000   struct elf64_x86_64_link_hash_table *htab;
4001   bfd *dynobj;
4002   asection *sdyn;
4003
4004   htab = elf64_x86_64_hash_table (info);
4005   if (htab == NULL)
4006     return FALSE;
4007
4008   dynobj = htab->elf.dynobj;
4009   sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
4010
4011   if (htab->elf.dynamic_sections_created)
4012     {
4013       Elf64_External_Dyn *dyncon, *dynconend;
4014
4015       if (sdyn == NULL || htab->elf.sgot == NULL)
4016         abort ();
4017
4018       dyncon = (Elf64_External_Dyn *) sdyn->contents;
4019       dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size);
4020       for (; dyncon < dynconend; dyncon++)
4021         {
4022           Elf_Internal_Dyn dyn;
4023           asection *s;
4024
4025           bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
4026
4027           switch (dyn.d_tag)
4028             {
4029             default:
4030               continue;
4031
4032             case DT_PLTGOT:
4033               s = htab->elf.sgotplt;
4034               dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4035               break;
4036
4037             case DT_JMPREL:
4038               dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
4039               break;
4040
4041             case DT_PLTRELSZ:
4042               s = htab->elf.srelplt->output_section;
4043               dyn.d_un.d_val = s->size;
4044               break;
4045
4046             case DT_RELASZ:
4047               /* The procedure linkage table relocs (DT_JMPREL) should
4048                  not be included in the overall relocs (DT_RELA).
4049                  Therefore, we override the DT_RELASZ entry here to
4050                  make it not include the JMPREL relocs.  Since the
4051                  linker script arranges for .rela.plt to follow all
4052                  other relocation sections, we don't have to worry
4053                  about changing the DT_RELA entry.  */
4054               if (htab->elf.srelplt != NULL)
4055                 {
4056                   s = htab->elf.srelplt->output_section;
4057                   dyn.d_un.d_val -= s->size;
4058                 }
4059               break;
4060
4061             case DT_TLSDESC_PLT:
4062               s = htab->elf.splt;
4063               dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
4064                 + htab->tlsdesc_plt;
4065               break;
4066
4067             case DT_TLSDESC_GOT:
4068               s = htab->elf.sgot;
4069               dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
4070                 + htab->tlsdesc_got;
4071               break;
4072             }
4073
4074           bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
4075         }
4076
4077       /* Fill in the special first entry in the procedure linkage table.  */
4078       if (htab->elf.splt && htab->elf.splt->size > 0)
4079         {
4080           /* Fill in the first entry in the procedure linkage table.  */
4081           memcpy (htab->elf.splt->contents, elf64_x86_64_plt0_entry,
4082                   PLT_ENTRY_SIZE);
4083           /* Add offset for pushq GOT+8(%rip), since the instruction
4084              uses 6 bytes subtract this value.  */
4085           bfd_put_32 (output_bfd,
4086                       (htab->elf.sgotplt->output_section->vma
4087                        + htab->elf.sgotplt->output_offset
4088                        + 8
4089                        - htab->elf.splt->output_section->vma
4090                        - htab->elf.splt->output_offset
4091                        - 6),
4092                       htab->elf.splt->contents + 2);
4093           /* Add offset for jmp *GOT+16(%rip). The 12 is the offset to
4094              the end of the instruction.  */
4095           bfd_put_32 (output_bfd,
4096                       (htab->elf.sgotplt->output_section->vma
4097                        + htab->elf.sgotplt->output_offset
4098                        + 16
4099                        - htab->elf.splt->output_section->vma
4100                        - htab->elf.splt->output_offset
4101                        - 12),
4102                       htab->elf.splt->contents + 8);
4103
4104           elf_section_data (htab->elf.splt->output_section)->this_hdr.sh_entsize =
4105             PLT_ENTRY_SIZE;
4106
4107           if (htab->tlsdesc_plt)
4108             {
4109               bfd_put_64 (output_bfd, (bfd_vma) 0,
4110                           htab->elf.sgot->contents + htab->tlsdesc_got);
4111
4112               memcpy (htab->elf.splt->contents + htab->tlsdesc_plt,
4113                       elf64_x86_64_plt0_entry,
4114                       PLT_ENTRY_SIZE);
4115
4116               /* Add offset for pushq GOT+8(%rip), since the
4117                  instruction uses 6 bytes subtract this value.  */
4118               bfd_put_32 (output_bfd,
4119                           (htab->elf.sgotplt->output_section->vma
4120                            + htab->elf.sgotplt->output_offset
4121                            + 8
4122                            - htab->elf.splt->output_section->vma
4123                            - htab->elf.splt->output_offset
4124                            - htab->tlsdesc_plt
4125                            - 6),
4126                           htab->elf.splt->contents + htab->tlsdesc_plt + 2);
4127               /* Add offset for jmp *GOT+TDG(%rip), where TGD stands for
4128                  htab->tlsdesc_got. The 12 is the offset to the end of
4129                  the instruction.  */
4130               bfd_put_32 (output_bfd,
4131                           (htab->elf.sgot->output_section->vma
4132                            + htab->elf.sgot->output_offset
4133                            + htab->tlsdesc_got
4134                            - htab->elf.splt->output_section->vma
4135                            - htab->elf.splt->output_offset
4136                            - htab->tlsdesc_plt
4137                            - 12),
4138                           htab->elf.splt->contents + htab->tlsdesc_plt + 8);
4139             }
4140         }
4141     }
4142
4143   if (htab->elf.sgotplt)
4144     {
4145       /* Fill in the first three entries in the global offset table.  */
4146       if (htab->elf.sgotplt->size > 0)
4147         {
4148           /* Set the first entry in the global offset table to the address of
4149              the dynamic section.  */
4150           if (sdyn == NULL)
4151             bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents);
4152           else
4153             bfd_put_64 (output_bfd,
4154                         sdyn->output_section->vma + sdyn->output_offset,
4155                         htab->elf.sgotplt->contents);
4156           /* Write GOT[1] and GOT[2], needed for the dynamic linker.  */
4157           bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE);
4158           bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE*2);
4159         }
4160
4161       elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize =
4162         GOT_ENTRY_SIZE;
4163     }
4164
4165   if (htab->elf.sgot && htab->elf.sgot->size > 0)
4166     elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize
4167       = GOT_ENTRY_SIZE;
4168
4169   /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols.  */
4170   htab_traverse (htab->loc_hash_table,
4171                  elf64_x86_64_finish_local_dynamic_symbol,
4172                  info);
4173
4174   return TRUE;
4175 }
4176
4177 /* Return address for Ith PLT stub in section PLT, for relocation REL
4178    or (bfd_vma) -1 if it should not be included.  */
4179
4180 static bfd_vma
4181 elf64_x86_64_plt_sym_val (bfd_vma i, const asection *plt,
4182                           const arelent *rel ATTRIBUTE_UNUSED)
4183 {
4184   return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
4185 }
4186
4187 /* Handle an x86-64 specific section when reading an object file.  This
4188    is called when elfcode.h finds a section with an unknown type.  */
4189
4190 static bfd_boolean
4191 elf64_x86_64_section_from_shdr (bfd *abfd,
4192                                 Elf_Internal_Shdr *hdr,
4193                                 const char *name,
4194                                 int shindex)
4195 {
4196   if (hdr->sh_type != SHT_X86_64_UNWIND)
4197     return FALSE;
4198
4199   if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
4200     return FALSE;
4201
4202   return TRUE;
4203 }
4204
4205 /* Hook called by the linker routine which adds symbols from an object
4206    file.  We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
4207    of .bss.  */
4208
4209 static bfd_boolean
4210 elf64_x86_64_add_symbol_hook (bfd *abfd,
4211                               struct bfd_link_info *info,
4212                               Elf_Internal_Sym *sym,
4213                               const char **namep ATTRIBUTE_UNUSED,
4214                               flagword *flagsp ATTRIBUTE_UNUSED,
4215                               asection **secp,
4216                               bfd_vma *valp)
4217 {
4218   asection *lcomm;
4219
4220   switch (sym->st_shndx)
4221     {
4222     case SHN_X86_64_LCOMMON:
4223       lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON");
4224       if (lcomm == NULL)
4225         {
4226           lcomm = bfd_make_section_with_flags (abfd,
4227                                                "LARGE_COMMON",
4228                                                (SEC_ALLOC
4229                                                 | SEC_IS_COMMON
4230                                                 | SEC_LINKER_CREATED));
4231           if (lcomm == NULL)
4232             return FALSE;
4233           elf_section_flags (lcomm) |= SHF_X86_64_LARGE;
4234         }
4235       *secp = lcomm;
4236       *valp = sym->st_size;
4237       return TRUE;
4238     }
4239
4240   if ((abfd->flags & DYNAMIC) == 0
4241       && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
4242     elf_tdata (info->output_bfd)->has_ifunc_symbols = TRUE;
4243
4244   return TRUE;
4245 }
4246
4247
4248 /* Given a BFD section, try to locate the corresponding ELF section
4249    index.  */
4250
4251 static bfd_boolean
4252 elf64_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED,
4253                                            asection *sec, int *index_return)
4254 {
4255   if (sec == &_bfd_elf_large_com_section)
4256     {
4257       *index_return = SHN_X86_64_LCOMMON;
4258       return TRUE;
4259     }
4260   return FALSE;
4261 }
4262
4263 /* Process a symbol.  */
4264
4265 static void
4266 elf64_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
4267                                 asymbol *asym)
4268 {
4269   elf_symbol_type *elfsym = (elf_symbol_type *) asym;
4270
4271   switch (elfsym->internal_elf_sym.st_shndx)
4272     {
4273     case SHN_X86_64_LCOMMON:
4274       asym->section = &_bfd_elf_large_com_section;
4275       asym->value = elfsym->internal_elf_sym.st_size;
4276       /* Common symbol doesn't set BSF_GLOBAL.  */
4277       asym->flags &= ~BSF_GLOBAL;
4278       break;
4279     }
4280 }
4281
4282 static bfd_boolean
4283 elf64_x86_64_common_definition (Elf_Internal_Sym *sym)
4284 {
4285   return (sym->st_shndx == SHN_COMMON
4286           || sym->st_shndx == SHN_X86_64_LCOMMON);
4287 }
4288
4289 static unsigned int
4290 elf64_x86_64_common_section_index (asection *sec)
4291 {
4292   if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
4293     return SHN_COMMON;
4294   else
4295     return SHN_X86_64_LCOMMON;
4296 }
4297
4298 static asection *
4299 elf64_x86_64_common_section (asection *sec)
4300 {
4301   if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
4302     return bfd_com_section_ptr;
4303   else
4304     return &_bfd_elf_large_com_section;
4305 }
4306
4307 static bfd_boolean
4308 elf64_x86_64_merge_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
4309                            struct elf_link_hash_entry **sym_hash ATTRIBUTE_UNUSED,
4310                            struct elf_link_hash_entry *h,
4311                            Elf_Internal_Sym *sym,
4312                            asection **psec,
4313                            bfd_vma *pvalue ATTRIBUTE_UNUSED,
4314                            unsigned int *pold_alignment ATTRIBUTE_UNUSED,
4315                            bfd_boolean *skip ATTRIBUTE_UNUSED,
4316                            bfd_boolean *override ATTRIBUTE_UNUSED,
4317                            bfd_boolean *type_change_ok ATTRIBUTE_UNUSED,
4318                            bfd_boolean *size_change_ok ATTRIBUTE_UNUSED,
4319                            bfd_boolean *newdef ATTRIBUTE_UNUSED,
4320                            bfd_boolean *newdyn,
4321                            bfd_boolean *newdyncommon ATTRIBUTE_UNUSED,
4322                            bfd_boolean *newweak ATTRIBUTE_UNUSED,
4323                            bfd *abfd ATTRIBUTE_UNUSED,
4324                            asection **sec,
4325                            bfd_boolean *olddef ATTRIBUTE_UNUSED,
4326                            bfd_boolean *olddyn,
4327                            bfd_boolean *olddyncommon ATTRIBUTE_UNUSED,
4328                            bfd_boolean *oldweak ATTRIBUTE_UNUSED,
4329                            bfd *oldbfd,
4330                            asection **oldsec)
4331 {
4332   /* A normal common symbol and a large common symbol result in a
4333      normal common symbol.  We turn the large common symbol into a
4334      normal one.  */
4335   if (!*olddyn
4336       && h->root.type == bfd_link_hash_common
4337       && !*newdyn
4338       && bfd_is_com_section (*sec)
4339       && *oldsec != *sec)
4340     {
4341       if (sym->st_shndx == SHN_COMMON
4342           && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) != 0)
4343         {
4344           h->root.u.c.p->section
4345             = bfd_make_section_old_way (oldbfd, "COMMON");
4346           h->root.u.c.p->section->flags = SEC_ALLOC;
4347         }
4348       else if (sym->st_shndx == SHN_X86_64_LCOMMON
4349                && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) == 0)
4350         *psec = *sec = bfd_com_section_ptr;
4351     }
4352
4353   return TRUE;
4354 }
4355
4356 static int
4357 elf64_x86_64_additional_program_headers (bfd *abfd,
4358                                          struct bfd_link_info *info ATTRIBUTE_UNUSED)
4359 {
4360   asection *s;
4361   int count = 0;
4362
4363   /* Check to see if we need a large readonly segment.  */
4364   s = bfd_get_section_by_name (abfd, ".lrodata");
4365   if (s && (s->flags & SEC_LOAD))
4366     count++;
4367
4368   /* Check to see if we need a large data segment.  Since .lbss sections
4369      is placed right after the .bss section, there should be no need for
4370      a large data segment just because of .lbss.  */
4371   s = bfd_get_section_by_name (abfd, ".ldata");
4372   if (s && (s->flags & SEC_LOAD))
4373     count++;
4374
4375   return count;
4376 }
4377
4378 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section.  */
4379
4380 static bfd_boolean
4381 elf64_x86_64_hash_symbol (struct elf_link_hash_entry *h)
4382 {
4383   if (h->plt.offset != (bfd_vma) -1
4384       && !h->def_regular
4385       && !h->pointer_equality_needed)
4386     return FALSE;
4387
4388   return _bfd_elf_hash_symbol (h);
4389 }
4390
4391 static const struct bfd_elf_special_section
4392   elf64_x86_64_special_sections[]=
4393 {
4394   { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS,   SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
4395   { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
4396   { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
4397   { STRING_COMMA_LEN (".lbss"),            -2, SHT_NOBITS,   SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
4398   { STRING_COMMA_LEN (".ldata"),           -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
4399   { STRING_COMMA_LEN (".lrodata"),         -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
4400   { NULL,                       0,          0, 0,            0 }
4401 };
4402
4403 #define TARGET_LITTLE_SYM                   bfd_elf64_x86_64_vec
4404 #define TARGET_LITTLE_NAME                  "elf64-x86-64"
4405 #define ELF_ARCH                            bfd_arch_i386
4406 #define ELF_MACHINE_CODE                    EM_X86_64
4407 #define ELF_MAXPAGESIZE                     0x200000
4408 #define ELF_MINPAGESIZE                     0x1000
4409 #define ELF_COMMONPAGESIZE                  0x1000
4410
4411 #define elf_backend_can_gc_sections         1
4412 #define elf_backend_can_refcount            1
4413 #define elf_backend_want_got_plt            1
4414 #define elf_backend_plt_readonly            1
4415 #define elf_backend_want_plt_sym            0
4416 #define elf_backend_got_header_size         (GOT_ENTRY_SIZE*3)
4417 #define elf_backend_rela_normal             1
4418
4419 #define elf_info_to_howto                   elf64_x86_64_info_to_howto
4420
4421 #define bfd_elf64_bfd_link_hash_table_create \
4422   elf64_x86_64_link_hash_table_create
4423 #define bfd_elf64_bfd_link_hash_table_free \
4424   elf64_x86_64_link_hash_table_free
4425 #define bfd_elf64_bfd_reloc_type_lookup     elf64_x86_64_reloc_type_lookup
4426 #define bfd_elf64_bfd_reloc_name_lookup \
4427   elf64_x86_64_reloc_name_lookup
4428
4429 #define elf_backend_adjust_dynamic_symbol   elf64_x86_64_adjust_dynamic_symbol
4430 #define elf_backend_relocs_compatible       _bfd_elf_relocs_compatible
4431 #define elf_backend_check_relocs            elf64_x86_64_check_relocs
4432 #define elf_backend_copy_indirect_symbol    elf64_x86_64_copy_indirect_symbol
4433 #define elf_backend_create_dynamic_sections elf64_x86_64_create_dynamic_sections
4434 #define elf_backend_finish_dynamic_sections elf64_x86_64_finish_dynamic_sections
4435 #define elf_backend_finish_dynamic_symbol   elf64_x86_64_finish_dynamic_symbol
4436 #define elf_backend_gc_mark_hook            elf64_x86_64_gc_mark_hook
4437 #define elf_backend_gc_sweep_hook           elf64_x86_64_gc_sweep_hook
4438 #define elf_backend_grok_prstatus           elf64_x86_64_grok_prstatus
4439 #define elf_backend_grok_psinfo             elf64_x86_64_grok_psinfo
4440 #define elf_backend_reloc_type_class        elf64_x86_64_reloc_type_class
4441 #define elf_backend_relocate_section        elf64_x86_64_relocate_section
4442 #define elf_backend_size_dynamic_sections   elf64_x86_64_size_dynamic_sections
4443 #define elf_backend_always_size_sections    elf64_x86_64_always_size_sections
4444 #define elf_backend_init_index_section      _bfd_elf_init_1_index_section
4445 #define elf_backend_plt_sym_val             elf64_x86_64_plt_sym_val
4446 #define elf_backend_object_p                elf64_x86_64_elf_object_p
4447 #define bfd_elf64_mkobject                  elf64_x86_64_mkobject
4448
4449 #define elf_backend_section_from_shdr \
4450         elf64_x86_64_section_from_shdr
4451
4452 #define elf_backend_section_from_bfd_section \
4453   elf64_x86_64_elf_section_from_bfd_section
4454 #define elf_backend_add_symbol_hook \
4455   elf64_x86_64_add_symbol_hook
4456 #define elf_backend_symbol_processing \
4457   elf64_x86_64_symbol_processing
4458 #define elf_backend_common_section_index \
4459   elf64_x86_64_common_section_index
4460 #define elf_backend_common_section \
4461   elf64_x86_64_common_section
4462 #define elf_backend_common_definition \
4463   elf64_x86_64_common_definition
4464 #define elf_backend_merge_symbol \
4465   elf64_x86_64_merge_symbol
4466 #define elf_backend_special_sections \
4467   elf64_x86_64_special_sections
4468 #define elf_backend_additional_program_headers \
4469   elf64_x86_64_additional_program_headers
4470 #define elf_backend_hash_symbol \
4471   elf64_x86_64_hash_symbol
4472
4473 #undef  elf_backend_post_process_headers
4474 #define elf_backend_post_process_headers  _bfd_elf_set_osabi
4475
4476 #include "elf64-target.h"
4477
4478 /* FreeBSD support.  */
4479
4480 #undef  TARGET_LITTLE_SYM
4481 #define TARGET_LITTLE_SYM                   bfd_elf64_x86_64_freebsd_vec
4482 #undef  TARGET_LITTLE_NAME
4483 #define TARGET_LITTLE_NAME                  "elf64-x86-64-freebsd"
4484
4485 #undef  ELF_OSABI
4486 #define ELF_OSABI                           ELFOSABI_FREEBSD
4487
4488 #undef  elf64_bed
4489 #define elf64_bed elf64_x86_64_fbsd_bed
4490
4491 #include "elf64-target.h"
4492
4493 /* Solaris 2 support.  */
4494
4495 #undef  TARGET_LITTLE_SYM
4496 #define TARGET_LITTLE_SYM                   bfd_elf64_x86_64_sol2_vec
4497 #undef  TARGET_LITTLE_NAME
4498 #define TARGET_LITTLE_NAME                  "elf64-x86-64-sol2"
4499
4500 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4501    objects won't be recognized.  */
4502 #undef ELF_OSABI
4503
4504 #undef  elf64_bed
4505 #define elf64_bed                           elf64_x86_64_sol2_bed
4506
4507 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4508
4509    Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4510    File, p.63.  */
4511 #undef elf_backend_want_plt_sym
4512 #define elf_backend_want_plt_sym            1
4513
4514 #include "elf64-target.h"
4515
4516 /* Intel L1OM support.  */
4517
4518 static bfd_boolean
4519 elf64_l1om_elf_object_p (bfd *abfd)
4520 {
4521   /* Set the right machine number for an L1OM elf64 file.  */
4522   bfd_default_set_arch_mach (abfd, bfd_arch_l1om, bfd_mach_l1om);
4523   return TRUE;
4524 }
4525
4526 #undef  TARGET_LITTLE_SYM
4527 #define TARGET_LITTLE_SYM                   bfd_elf64_l1om_vec
4528 #undef  TARGET_LITTLE_NAME
4529 #define TARGET_LITTLE_NAME                  "elf64-l1om"
4530 #undef ELF_ARCH
4531 #define ELF_ARCH                            bfd_arch_l1om
4532
4533 #undef  ELF_MACHINE_CODE
4534 #define ELF_MACHINE_CODE                    EM_L1OM
4535
4536 #undef  ELF_OSABI
4537
4538 #undef  elf64_bed
4539 #define elf64_bed elf64_l1om_bed
4540
4541 #undef elf_backend_object_p
4542 #define elf_backend_object_p                elf64_l1om_elf_object_p
4543
4544 #undef  elf_backend_post_process_headers
4545
4546 #include "elf64-target.h"
4547
4548 /* FreeBSD L1OM support.  */
4549
4550 #undef  TARGET_LITTLE_SYM
4551 #define TARGET_LITTLE_SYM                   bfd_elf64_l1om_freebsd_vec
4552 #undef  TARGET_LITTLE_NAME
4553 #define TARGET_LITTLE_NAME                  "elf64-l1om-freebsd"
4554
4555 #undef  ELF_OSABI
4556 #define ELF_OSABI                           ELFOSABI_FREEBSD
4557
4558 #undef  elf64_bed
4559 #define elf64_bed elf64_l1om_fbsd_bed
4560
4561 #undef  elf_backend_post_process_headers
4562 #define elf_backend_post_process_headers  _bfd_elf_set_osabi
4563
4564 #include "elf64-target.h"