/src/binutils-gdb/bfd/elf64-s390.c

Source
/* IBM S/390-specific support for 64-bit ELF
   Copyright (C) 2000-2026 Free Software Foundation, Inc.
   Contributed Martin Schwidefsky (schwidefsky@de.ibm.com).

   This file is part of BFD, the Binary File Descriptor library.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
   02110-1301, USA.  */

#include "sysdep.h"
#include "bfd.h"
#include "bfdlink.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf/s390.h"
#include "elf-s390.h"
#include "dwarf2.h"
#include "sframe.h"
#include "sframe-api.h"
#include <stdarg.h>

/* In case we're on a 32-bit machine, construct a 64-bit "-1" value
   from smaller values.  Start with zero, widen, *then* decrement.  */
#define MINUS_ONE      (((bfd_vma)0) - 1)

static bfd_reloc_status_type
s390_tls_reloc (bfd *, arelent *, asymbol *, void *,
    asection *, bfd *, char **);
static bfd_reloc_status_type
s390_elf_ldisp_reloc (bfd *, arelent *, asymbol *, void *,
          asection *, bfd *, char **);

/* The relocation "howto" table.  */
static reloc_howto_type elf_howto_table[] =
{
  HOWTO (R_390_NONE,    /* type */
   0,     /* rightshift */
   0,     /* size */
   0,     /* bitsize */
   false,     /* pc_relative */
   0,     /* bitpos */
   complain_overflow_dont, /* complain_on_overflow */
   bfd_elf_generic_reloc, /* special_function */
   "R_390_NONE",    /* name */
   false,     /* partial_inplace */
   0,     /* src_mask */
   0,     /* dst_mask */
   false),    /* pcrel_offset */

  HOWTO(R_390_8,   0, 1,  8, false, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_8",  false, 0,0x000000ff, false),
  HOWTO(R_390_12,  0, 2, 12, false, 0, complain_overflow_dont,
  bfd_elf_generic_reloc, "R_390_12",   false, 0,0x00000fff, false),
  HOWTO(R_390_16,  0, 2, 16, false, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_16",   false, 0,0x0000ffff, false),
  HOWTO(R_390_32,  0, 4, 32, false, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_32",   false, 0,0xffffffff, false),
  HOWTO(R_390_PC32,  0, 4, 32,  true, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_PC32",   false, 0,0xffffffff, true),
  HOWTO(R_390_GOT12,   0, 2, 12, false, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_GOT12",  false, 0,0x00000fff, false),
  HOWTO(R_390_GOT32,   0, 4, 32, false, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_GOT32",  false, 0,0xffffffff, false),
  HOWTO(R_390_PLT32,   0, 4, 32,  true, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_PLT32",  false, 0,0xffffffff, true),
  HOWTO(R_390_COPY,  0, 8, 64, false, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_COPY",   false, 0,MINUS_ONE,  false),
  HOWTO(R_390_GLOB_DAT,  0, 8, 64, false, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_GLOB_DAT", false, 0,MINUS_ONE,  false),
  HOWTO(R_390_JMP_SLOT,  0, 8, 64, false, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_JMP_SLOT", false, 0,MINUS_ONE,  false),
  HOWTO(R_390_RELATIVE,  0, 8, 64,  true, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_RELATIVE", false, 0,MINUS_ONE,  false),
  HOWTO(R_390_GOTOFF32,  0, 4, 32, false, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_GOTOFF32", false, 0,MINUS_ONE,  false),
  HOWTO(R_390_GOTPC,   0, 8, 64,  true, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_GOTPC",  false, 0,MINUS_ONE,  true),
  HOWTO(R_390_GOT16,   0, 2, 16, false, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_GOT16",  false, 0,0x0000ffff, false),
  HOWTO(R_390_PC16,  0, 2, 16,  true, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_PC16",   false, 0,0x0000ffff, true),
  HOWTO(R_390_PC16DBL,   1, 2, 16,  true, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_PC16DBL",  false, 0,0x0000ffff, true),
  HOWTO(R_390_PLT16DBL,  1, 2, 16,  true, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_PLT16DBL", false, 0,0x0000ffff, true),
  HOWTO(R_390_PC32DBL,   1, 4, 32,  true, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_PC32DBL",  false, 0,0xffffffff, true),
  HOWTO(R_390_PLT32DBL,  1, 4, 32,  true, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_PLT32DBL", false, 0,0xffffffff, true),
  HOWTO(R_390_GOTPCDBL,  1, 4, 32,  true, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_GOTPCDBL", false, 0,MINUS_ONE,  true),
  HOWTO(R_390_64,  0, 8, 64, false, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_64",   false, 0,MINUS_ONE,  false),
  HOWTO(R_390_PC64,  0, 8, 64,  true, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_PC64",   false, 0,MINUS_ONE,  true),
  HOWTO(R_390_GOT64,   0, 8, 64, false, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_GOT64",  false, 0,MINUS_ONE,  false),
  HOWTO(R_390_PLT64,   0, 8, 64,  true, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_PLT64",  false, 0,MINUS_ONE,  true),
  HOWTO(R_390_GOTENT,  1, 4, 32,  true, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_GOTENT",   false, 0,MINUS_ONE,  true),
  HOWTO(R_390_GOTOFF16,  0, 2, 16, false, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_GOTOFF16", false, 0,0x0000ffff, false),
  HOWTO(R_390_GOTOFF64,  0, 8, 64, false, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_GOTOFF64", false, 0,MINUS_ONE,  false),
  HOWTO(R_390_GOTPLT12,  0, 2, 12, false, 0, complain_overflow_dont,
  bfd_elf_generic_reloc, "R_390_GOTPLT12", false, 0,0x00000fff, false),
  HOWTO(R_390_GOTPLT16,  0, 2, 16, false, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_GOTPLT16", false, 0,0x0000ffff, false),
  HOWTO(R_390_GOTPLT32,  0, 4, 32, false, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_GOTPLT32", false, 0,0xffffffff, false),
  HOWTO(R_390_GOTPLT64,  0, 8, 64, false, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_GOTPLT64", false, 0,MINUS_ONE,  false),
  HOWTO(R_390_GOTPLTENT, 1, 4, 32,  true, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_GOTPLTENT",false, 0,MINUS_ONE,  true),
  HOWTO(R_390_PLTOFF16,  0, 2, 16, false, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_PLTOFF16", false, 0,0x0000ffff, false),
  HOWTO(R_390_PLTOFF32,  0, 4, 32, false, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_PLTOFF32", false, 0,0xffffffff, false),
  HOWTO(R_390_PLTOFF64,  0, 8, 64, false, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_PLTOFF64", false, 0,MINUS_ONE,  false),
  HOWTO(R_390_TLS_LOAD, 0, 0, 0, false, 0, complain_overflow_dont,
  s390_tls_reloc, "R_390_TLS_LOAD", false, 0, 0, false),
  HOWTO(R_390_TLS_GDCALL, 0, 0, 0, false, 0, complain_overflow_dont,
  s390_tls_reloc, "R_390_TLS_GDCALL", false, 0, 0, false),
  HOWTO(R_390_TLS_LDCALL, 0, 0, 0, false, 0, complain_overflow_dont,
  s390_tls_reloc, "R_390_TLS_LDCALL", false, 0, 0, false),
  EMPTY_HOWTO (R_390_TLS_GD32), /* Empty entry for R_390_TLS_GD32.  */
  HOWTO(R_390_TLS_GD64,  0, 8, 64, false, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_TLS_GD64", false, 0, MINUS_ONE, false),
  HOWTO(R_390_TLS_GOTIE12, 0, 2, 12, false, 0, complain_overflow_dont,
  bfd_elf_generic_reloc, "R_390_TLS_GOTIE12", false, 0, 0x00000fff, false),
  EMPTY_HOWTO (R_390_TLS_GOTIE32),  /* Empty entry for R_390_TLS_GOTIE32.  */
  HOWTO(R_390_TLS_GOTIE64, 0, 8, 64, false, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_TLS_GOTIE64", false, 0, MINUS_ONE, false),
  EMPTY_HOWTO (R_390_TLS_LDM32),  /* Empty entry for R_390_TLS_LDM32.  */
  HOWTO(R_390_TLS_LDM64, 0, 8, 64, false, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_TLS_LDM64", false, 0, MINUS_ONE, false),
  EMPTY_HOWTO (R_390_TLS_IE32), /* Empty entry for R_390_TLS_IE32.  */
  HOWTO(R_390_TLS_IE64,  0, 8, 64, false, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_TLS_IE64", false, 0, MINUS_ONE, false),
  HOWTO(R_390_TLS_IEENT, 1, 4, 32, true, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_TLS_IEENT", false, 0, MINUS_ONE, true),
  EMPTY_HOWTO (R_390_TLS_LE32), /* Empty entry for R_390_TLS_LE32.  */
  HOWTO(R_390_TLS_LE64,  0, 8, 64, false, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_TLS_LE64", false, 0, MINUS_ONE, false),
  EMPTY_HOWTO (R_390_TLS_LDO32),  /* Empty entry for R_390_TLS_LDO32.  */
  HOWTO(R_390_TLS_LDO64, 0, 8, 64, false, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_TLS_LDO64", false, 0, MINUS_ONE, false),
  HOWTO(R_390_TLS_DTPMOD, 0, 8, 64, false, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_TLS_DTPMOD", false, 0, MINUS_ONE, false),
  HOWTO(R_390_TLS_DTPOFF, 0, 8, 64, false, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_TLS_DTPOFF", false, 0, MINUS_ONE, false),
  HOWTO(R_390_TLS_TPOFF, 0, 8, 64, false, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_TLS_TPOFF", false, 0, MINUS_ONE, false),
  HOWTO(R_390_20,  0, 4, 20, false, 8, complain_overflow_dont,
  s390_elf_ldisp_reloc, "R_390_20",      false, 0,0x0fffff00, false),
  HOWTO(R_390_GOT20,   0, 4, 20, false, 8, complain_overflow_dont,
  s390_elf_ldisp_reloc, "R_390_GOT20",   false, 0,0x0fffff00, false),
  HOWTO(R_390_GOTPLT20,  0, 4, 20, false, 8, complain_overflow_dont,
  s390_elf_ldisp_reloc, "R_390_GOTPLT20", false, 0,0x0fffff00, false),
  HOWTO(R_390_TLS_GOTIE20, 0, 4, 20, false, 8, complain_overflow_dont,
  s390_elf_ldisp_reloc, "R_390_TLS_GOTIE20", false, 0,0x0fffff00, false),
  HOWTO(R_390_IRELATIVE, 0, 8, 64, false, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_IRELATIVE", false, 0, MINUS_ONE, false),
  HOWTO(R_390_PC12DBL,   1, 2, 12,  true, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_PC12DBL",  false, 0,0x00000fff, true),
  HOWTO(R_390_PLT12DBL,  1, 2, 12,  true, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_PLT12DBL", false, 0,0x00000fff, true),
  HOWTO(R_390_PC24DBL,   1, 4, 24,  true, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_PC24DBL",  false, 0,0x00ffffff, true),
  HOWTO(R_390_PLT24DBL,  1, 4, 24,  true, 0, complain_overflow_bitfield,
  bfd_elf_generic_reloc, "R_390_PLT24DBL", false, 0,0x00ffffff, true),
};

/* GNU extension to record C++ vtable hierarchy.  */
static reloc_howto_type elf64_s390_vtinherit_howto =
  HOWTO (R_390_GNU_VTINHERIT, 0,8,0,false,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", false,0, 0, false);
static reloc_howto_type elf64_s390_vtentry_howto =
  HOWTO (R_390_GNU_VTENTRY, 0,8,0,false,0,complain_overflow_dont, _bfd_elf_rel_vtable_reloc_fn,"R_390_GNU_VTENTRY", false,0,0, false);

static reloc_howto_type *
elf_s390_reloc_type_lookup (bfd *abfd,
          bfd_reloc_code_real_type code)
{
  switch (code)
    {
    case BFD_RELOC_NONE:
      return &elf_howto_table[(int) R_390_NONE];
    case BFD_RELOC_8:
      return &elf_howto_table[(int) R_390_8];
    case BFD_RELOC_390_12:
      return &elf_howto_table[(int) R_390_12];
    case BFD_RELOC_16:
      return &elf_howto_table[(int) R_390_16];
    case BFD_RELOC_32:
      return &elf_howto_table[(int) R_390_32];
    case BFD_RELOC_CTOR:
      return &elf_howto_table[(int) R_390_32];
    case BFD_RELOC_32_PCREL:
      return &elf_howto_table[(int) R_390_PC32];
    case BFD_RELOC_390_GOT12:
      return &elf_howto_table[(int) R_390_GOT12];
    case BFD_RELOC_32_GOT_PCREL:
      return &elf_howto_table[(int) R_390_GOT32];
    case BFD_RELOC_32_PLT_PCREL:
      return &elf_howto_table[(int) R_390_PLT32];
    case BFD_RELOC_COPY:
      return &elf_howto_table[(int) R_390_COPY];
    case BFD_RELOC_GLOB_DAT:
      return &elf_howto_table[(int) R_390_GLOB_DAT];
    case BFD_RELOC_JMP_SLOT:
      return &elf_howto_table[(int) R_390_JMP_SLOT];
    case BFD_RELOC_RELATIVE:
      return &elf_howto_table[(int) R_390_RELATIVE];
    case BFD_RELOC_32_GOTOFF:
      return &elf_howto_table[(int) R_390_GOTOFF32];
    case BFD_RELOC_390_GOTPC:
      return &elf_howto_table[(int) R_390_GOTPC];
    case BFD_RELOC_390_GOT16:
      return &elf_howto_table[(int) R_390_GOT16];
    case BFD_RELOC_16_PCREL:
      return &elf_howto_table[(int) R_390_PC16];
    case BFD_RELOC_390_PC12DBL:
      return &elf_howto_table[(int) R_390_PC12DBL];
    case BFD_RELOC_390_PLT12DBL:
      return &elf_howto_table[(int) R_390_PLT12DBL];
    case BFD_RELOC_390_PC16DBL:
      return &elf_howto_table[(int) R_390_PC16DBL];
    case BFD_RELOC_390_PLT16DBL:
      return &elf_howto_table[(int) R_390_PLT16DBL];
    case BFD_RELOC_390_PC24DBL:
      return &elf_howto_table[(int) R_390_PC24DBL];
    case BFD_RELOC_390_PLT24DBL:
      return &elf_howto_table[(int) R_390_PLT24DBL];
    case BFD_RELOC_390_PC32DBL:
      return &elf_howto_table[(int) R_390_PC32DBL];
    case BFD_RELOC_390_PLT32DBL:
      return &elf_howto_table[(int) R_390_PLT32DBL];
    case BFD_RELOC_390_GOTPCDBL:
      return &elf_howto_table[(int) R_390_GOTPCDBL];
    case BFD_RELOC_64:
      return &elf_howto_table[(int) R_390_64];
    case BFD_RELOC_64_PCREL:
      return &elf_howto_table[(int) R_390_PC64];
    case BFD_RELOC_390_GOT64:
      return &elf_howto_table[(int) R_390_GOT64];
    case BFD_RELOC_64_PLT_PCREL:
      return &elf_howto_table[(int) R_390_PLT64];
    case BFD_RELOC_390_GOTENT:
      return &elf_howto_table[(int) R_390_GOTENT];
    case BFD_RELOC_16_GOTOFF:
      return &elf_howto_table[(int) R_390_GOTOFF16];
    case BFD_RELOC_390_GOTOFF64:
      return &elf_howto_table[(int) R_390_GOTOFF64];
    case BFD_RELOC_390_GOTPLT12:
      return &elf_howto_table[(int) R_390_GOTPLT12];
    case BFD_RELOC_390_GOTPLT16:
      return &elf_howto_table[(int) R_390_GOTPLT16];
    case BFD_RELOC_390_GOTPLT32:
      return &elf_howto_table[(int) R_390_GOTPLT32];
    case BFD_RELOC_390_GOTPLT64:
      return &elf_howto_table[(int) R_390_GOTPLT64];
    case BFD_RELOC_390_GOTPLTENT:
      return &elf_howto_table[(int) R_390_GOTPLTENT];
    case BFD_RELOC_390_PLTOFF16:
      return &elf_howto_table[(int) R_390_PLTOFF16];
    case BFD_RELOC_390_PLTOFF32:
      return &elf_howto_table[(int) R_390_PLTOFF32];
    case BFD_RELOC_390_PLTOFF64:
      return &elf_howto_table[(int) R_390_PLTOFF64];
    case BFD_RELOC_390_TLS_LOAD:
      return &elf_howto_table[(int) R_390_TLS_LOAD];
    case BFD_RELOC_390_TLS_GDCALL:
      return &elf_howto_table[(int) R_390_TLS_GDCALL];
    case BFD_RELOC_390_TLS_LDCALL:
      return &elf_howto_table[(int) R_390_TLS_LDCALL];
    case BFD_RELOC_390_TLS_GD64:
      return &elf_howto_table[(int) R_390_TLS_GD64];
    case BFD_RELOC_390_TLS_GOTIE12:
      return &elf_howto_table[(int) R_390_TLS_GOTIE12];
    case BFD_RELOC_390_TLS_GOTIE64:
      return &elf_howto_table[(int) R_390_TLS_GOTIE64];
    case BFD_RELOC_390_TLS_LDM64:
      return &elf_howto_table[(int) R_390_TLS_LDM64];
    case BFD_RELOC_390_TLS_IE64:
      return &elf_howto_table[(int) R_390_TLS_IE64];
    case BFD_RELOC_390_TLS_IEENT:
      return &elf_howto_table[(int) R_390_TLS_IEENT];
    case BFD_RELOC_390_TLS_LE64:
      return &elf_howto_table[(int) R_390_TLS_LE64];
    case BFD_RELOC_390_TLS_LDO64:
      return &elf_howto_table[(int) R_390_TLS_LDO64];
    case BFD_RELOC_390_TLS_DTPMOD:
      return &elf_howto_table[(int) R_390_TLS_DTPMOD];
    case BFD_RELOC_390_TLS_DTPOFF:
      return &elf_howto_table[(int) R_390_TLS_DTPOFF];
    case BFD_RELOC_390_TLS_TPOFF:
      return &elf_howto_table[(int) R_390_TLS_TPOFF];
    case BFD_RELOC_390_20:
      return &elf_howto_table[(int) R_390_20];
    case BFD_RELOC_390_GOT20:
      return &elf_howto_table[(int) R_390_GOT20];
    case BFD_RELOC_390_GOTPLT20:
      return &elf_howto_table[(int) R_390_GOTPLT20];
    case BFD_RELOC_390_TLS_GOTIE20:
      return &elf_howto_table[(int) R_390_TLS_GOTIE20];
    case BFD_RELOC_IRELATIVE:
      return &elf_howto_table[(int) R_390_IRELATIVE];
    case BFD_RELOC_VTABLE_INHERIT:
      return &elf64_s390_vtinherit_howto;
    case BFD_RELOC_VTABLE_ENTRY:
      return &elf64_s390_vtentry_howto;
    default:
      break;
    }

  /* xgettext:c-format */
  _bfd_error_handler (_("%pB: unsupported relocation type %#x"), abfd, (int) code);
  bfd_set_error (bfd_error_bad_value);
  return NULL;
}

static reloc_howto_type *
elf_s390_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
          const char *r_name)
{
  unsigned int i;

  for (i = 0;
       i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]);
       i++)
    if (elf_howto_table[i].name != NULL
  && strcasecmp (elf_howto_table[i].name, r_name) == 0)
      return &elf_howto_table[i];

  if (strcasecmp (elf64_s390_vtinherit_howto.name, r_name) == 0)
    return &elf64_s390_vtinherit_howto;
  if (strcasecmp (elf64_s390_vtentry_howto.name, r_name) == 0)
    return &elf64_s390_vtentry_howto;

  return NULL;
}

/* We need to use ELF64_R_TYPE so we have our own copy of this function,
   and elf64-s390.c has its own copy.  */

static bool
elf_s390_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED,
      arelent *cache_ptr,
      Elf_Internal_Rela *dst)
{
  unsigned int r_type = ELF64_R_TYPE(dst->r_info);

  switch (r_type)
    {
    case R_390_GNU_VTINHERIT:
      cache_ptr->howto = &elf64_s390_vtinherit_howto;
      break;

    case R_390_GNU_VTENTRY:
      cache_ptr->howto = &elf64_s390_vtentry_howto;
      break;

    default:
      if (r_type >= sizeof (elf_howto_table) / sizeof (elf_howto_table[0]))
  {
    /* xgettext:c-format */
    _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
            abfd, r_type);
    bfd_set_error (bfd_error_bad_value);
    return false;
  }
      cache_ptr->howto = &elf_howto_table[r_type];
    }
  return true;
}

/* A relocation function which doesn't do anything.  */
static bfd_reloc_status_type
s390_tls_reloc (bfd *abfd ATTRIBUTE_UNUSED,
    arelent *reloc_entry,
    asymbol *symbol ATTRIBUTE_UNUSED,
    void * data ATTRIBUTE_UNUSED,
    asection *input_section,
    bfd *output_bfd,
    char **error_message ATTRIBUTE_UNUSED)
{
  if (output_bfd)
    reloc_entry->address += input_section->output_offset;
  return bfd_reloc_ok;
}

/* Handle the large displacement relocs.  */
static bfd_reloc_status_type
s390_elf_ldisp_reloc (bfd *abfd,
          arelent *reloc_entry,
          asymbol *symbol,
          void * data,
          asection *input_section,
          bfd *output_bfd,
          char **error_message ATTRIBUTE_UNUSED)
{
  reloc_howto_type *howto = reloc_entry->howto;
  bfd_vma relocation;
  bfd_vma insn;

  if (output_bfd != (bfd *) NULL
      && (symbol->flags & BSF_SECTION_SYM) == 0
      && (! howto->partial_inplace
    || reloc_entry->addend == 0))
    {
      reloc_entry->address += input_section->output_offset;
      return bfd_reloc_ok;
    }
  if (output_bfd != NULL)
    return bfd_reloc_continue;

  if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
    return bfd_reloc_outofrange;

  relocation = (symbol->value
    + symbol->section->output_section->vma
    + symbol->section->output_offset);
  relocation += reloc_entry->addend;
  if (howto->pc_relative)
    {
      relocation -= (input_section->output_section->vma
         + input_section->output_offset);
      relocation -= reloc_entry->address;
    }

  insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
  insn |= (relocation & 0xfff) << 16 | (relocation & 0xff000) >> 4;
  bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address);

  if ((bfd_signed_vma) relocation < - 0x80000
      || (bfd_signed_vma) relocation > 0x7ffff)
    return bfd_reloc_overflow;
  else
    return bfd_reloc_ok;
}

static bool
elf_s390_is_local_label_name (bfd *abfd, const char *name)
{
  if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
    return true;

  return _bfd_elf_is_local_label_name (abfd, name);
}

/* Functions for the 390 ELF linker.  */

/* The name of the dynamic interpreter.  This is put in the .interp
   section.  */

#define ELF_DYNAMIC_INTERPRETER "/lib/ld64.so.1"

/* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
   copying dynamic variables from a shared lib into an app's dynbss
   section, and instead use a dynamic relocation to point into the
   shared lib.  */
#define ELIMINATE_COPY_RELOCS 1

/* The size in bytes of the first entry in the procedure linkage table.  */
#define PLT_FIRST_ENTRY_SIZE 32
/* The size in bytes of an entry in the procedure linkage table.  */
#define PLT_ENTRY_SIZE 32

#define GOT_ENTRY_SIZE 8

#define RELA_ENTRY_SIZE sizeof (Elf64_External_Rela)

/* The first three entries in a global offset table are reserved,
   and the initial contents are unimportant (we zero them out).
   Subsequent entries look like this.  See the SVR4 ABI 386
   supplement to see how this works.  */

/* For the s390, simple addr offset can only be 0 - 4096.
   To use the full 16777216 TB address space, several instructions
   are needed to load an address in a register and execute
   a branch( or just saving the address)

   Furthermore, only r 0 and 1 are free to use!!!  */

/* The first 3 words in the GOT are then reserved.
   Word 0 is the address of the dynamic table.
   Word 1 is a pointer to a structure describing the object
   Word 2 is used to point to the loader entry address.

   The code for PLT entries looks like this:

   The GOT holds the address in the PLT to be executed.
   The loader then gets:
   48(15) =  Pointer to the structure describing the object.
   56(15) =  Offset in symbol table
   The loader  must  then find the module where the function is
   and insert the address in the GOT.

   PLT1: LARL 1,<fn>@GOTENT # 6 bytes  Load address of GOT entry in r1
   LG   1,0(1)    # 6 bytes  Load address from GOT in r1
   BCR  15,1    # 2 bytes  Jump to address
   RET1: BASR 1,0   # 2 bytes  Return from GOT 1st time
   LGF  1,12(1)   # 6 bytes  Load rela.plt offset into r1
   BRCL 15,-x   # 6 bytes  Jump to first PLT entry
   .long ?    # 4 bytes  offset into .rela.plt

   Total = 32 bytes per PLT entry
   Fixup at offset 2: relative address to GOT entry
   Fixup at offset 22: relative branch to PLT0
   Fixup at offset 28: 32 bit offset into .rela.plt

   A 32 bit offset into the symbol table is enough. It allows for
   .rela.plt sections up to a size of 2 gigabyte.  A single dynamic
   object (the main program, any shared library) is limited to 4GB in
   size.  Having a .rela.plt of 2GB would already make the .plt
   section bigger than 8GB.  */

static const bfd_byte elf_s390x_plt_entry[PLT_ENTRY_SIZE] =
  {
    0xc0, 0x10, 0x00, 0x00, 0x00, 0x00,     /* larl    %r1,.     */
    0xe3, 0x10, 0x10, 0x00, 0x00, 0x04,     /* lg      %r1,0(%r1)  */
    0x07, 0xf1,           /* br      %r1     */
    0x0d, 0x10,           /* basr    %r1,%r0     */
    0xe3, 0x10, 0x10, 0x0c, 0x00, 0x14,     /* lgf     %r1,12(%r1) */
    0xc0, 0xf4, 0x00, 0x00, 0x00, 0x00,     /* jg      first plt   */
    0x00, 0x00, 0x00, 0x00        /* .long   0x00000000  */
  };

/* The first PLT entry pushes the offset into the symbol table
   from R1 onto the stack at 56(15) and the loader object info
   at 48(15), loads the loader address in R1 and jumps to it.  */

/* The first entry in the PLT:

  PLT0:
     STG  1,56(15)  # r1 contains the offset into the symbol table
     LARL 1,_GLOBAL_OFFSET_TABLE # load address of global offset table
     MVC  48(8,15),8(1) # move loader ino (object struct address) to stack
     LG   1,16(1)   # get entry address of loader
     BCR  15,1      # jump to loader

     Fixup at offset 8: relative address to start of GOT.  */

static const bfd_byte elf_s390x_first_plt_entry[PLT_FIRST_ENTRY_SIZE] =
  {
    0xe3, 0x10, 0xf0, 0x38, 0x00, 0x24,     /* stg     %r1,56(%r15)  */
    0xc0, 0x10, 0x00, 0x00, 0x00, 0x00,     /* larl    %r1,.     */
    0xd2, 0x07, 0xf0, 0x30, 0x10, 0x08,     /* mvc     48(8,%r15),8(%r1) */
    0xe3, 0x10, 0x10, 0x10, 0x00, 0x04,     /* lg      %r1,16(%r1)   */
    0x07, 0xf1,           /* br      %r1     */
    0x07, 0x00,           /* nopr    %r0     */
    0x07, 0x00,           /* nopr    %r0     */
    0x07, 0x00            /* nopr    %r0     */
  };

/* .eh_frame covering the .plt section.  */

#define PLT_CIE_SIZE    24
#define PLT_FDE_SIZE    20
#define PLT_FDE_START_OFFSET  (PLT_CIE_SIZE + 8)
#define PLT_FDE_LEN_OFFSET  (PLT_CIE_SIZE + 12)

static const bfd_byte elf_s390x_eh_frame_plt[] =
{
  0, 0, 0, PLT_CIE_SIZE - 4,  /* CIE length */
  0, 0, 0, 0,     /* CIE ID */
  1,        /* CIE version */
  'z', 'R', 0,      /* Augmentation string */
  1,        /* Code alignment factor */
  0x78,       /* Data alignment factor */
  14,       /* Return address column */
  1,        /* Augmentation size */
  DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
  DW_CFA_def_cfa, 15, 0xa0, 0x01, /* DW_CFA_def_cfa: r15 ofs 160 */
  DW_CFA_nop, DW_CFA_nop, DW_CFA_nop,

  0, 0, 0, PLT_FDE_SIZE - 4,  /* FDE length */
  0, 0, 0, PLT_CIE_SIZE + 4,  /* CIE pointer */
  0, 0, 0, 0,     /* R_S390_PC32 .plt goes here */
  0, 0, 0, 0,     /* .plt size goes here */
  0,        /* Augmentation size */
  DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
};

/* .sframe covering the .plt section.  */

/* This must be the same as sframe_get_hdr_size (sfh).  For s390x, this value
   is the same as sizeof (sframe_header) because there is no SFrame auxilliary
   header.  */
#define PLT_SFRAME_FDE_START_OFFSET sizeof (sframe_header)

#define SFRAME_PLT0_MAX_NUM_FRES 1
#define SFRAME_PLTN_MAX_NUM_FRES 1

struct elf_s390x_sframe_plt
{
  unsigned int plt0_entry_size;
  unsigned int plt0_num_fres;
  const sframe_frame_row_entry *plt0_fres[SFRAME_PLT0_MAX_NUM_FRES];

  unsigned int pltn_entry_size;
  unsigned int pltn_num_fres;
  const sframe_frame_row_entry *pltn_fres[SFRAME_PLTN_MAX_NUM_FRES];
};

/* .sframe FRE covering the PLT0/PLTn .plt section entry.  */
static const sframe_frame_row_entry elf_s390x_sframe_plt_fre =
{
  0, /* SFrame FRE start address.  */
  { SFRAME_V2_S390X_CFA_OFFSET_ENCODE (160), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, /* Offset bytes.  */
  SFRAME_V1_FRE_INFO (SFRAME_BASE_REG_SP, 1, SFRAME_FRE_OFFSET_1B) /* FRE info.  */
};

/* SFrame helper object for PLT.  */
static const struct elf_s390x_sframe_plt elf_s390x_sframe_plt =
{
  PLT_FIRST_ENTRY_SIZE,
  1, /* Number of FREs for PLT0.  */
  /* Array of SFrame FREs for PLT0.  */
  { &elf_s390x_sframe_plt_fre },

  PLT_ENTRY_SIZE,
  1, /* Number of FREs for PLTn.  */
  /* Array of SFrame FREs for PLTn.  */
  { &elf_s390x_sframe_plt_fre },
};


/* s390 ELF linker hash entry.  */

struct elf_s390_link_hash_entry
{
  struct elf_link_hash_entry elf;

  /* Number of GOTPLT references for a function.  */
  bfd_signed_vma gotplt_refcount;

#define GOT_UNKNOWN 0
#define GOT_NORMAL  1
#define GOT_TLS_GD  2
#define GOT_TLS_IE  3
#define GOT_TLS_IE_NLT  4  /* Initial Exec, no literal pool entry.  */
  unsigned char tls_type;

  /* For pointer equality reasons we might need to change the symbol
     type from STT_GNU_IFUNC to STT_FUNC together with its value and
     section entry.  So after alloc_dynrelocs only these values should
     be used.  In order to check whether a symbol is IFUNC use
     s390_is_ifunc_symbol_p.  */
  bfd_vma ifunc_resolver_address;
  asection *ifunc_resolver_section;
};

#define elf_s390_hash_entry(ent) \
  ((struct elf_s390_link_hash_entry *)(ent))

/* This structure represents an entry in the local PLT list needed for
   local IFUNC symbols.  */
struct plt_entry
{
  /* The section of the local symbol.
     Set in relocate_section and used in finish_dynamic_sections.  */
  asection *sec;

  union
    {
      bfd_signed_vma refcount;
      bfd_vma offset;
    } plt;
};

/* NOTE: Keep this structure in sync with
   the one declared in elf32-s390.c.  */
struct elf_s390_obj_tdata
{
  struct elf_obj_tdata root;

  /* A local PLT is needed for ifunc symbols.  */
  struct plt_entry *local_plt;

  /* TLS type for each local got entry.  */
  char *local_got_tls_type;
};

#define elf_s390_tdata(abfd) \
  ((struct elf_s390_obj_tdata *) (abfd)->tdata.any)

#define elf_s390_local_plt(abfd) \
  (elf_s390_tdata (abfd)->local_plt)

#define elf_s390_local_got_tls_type(abfd) \
  (elf_s390_tdata (abfd)->local_got_tls_type)

#define is_s390_elf(bfd)        \
  (bfd_get_flavour (bfd) == bfd_target_elf_flavour  \
   && elf_tdata (bfd) != NULL        \
   && elf_object_id (bfd) == S390_ELF_DATA)

static bool
elf_s390_mkobject (bfd *abfd)
{
  return bfd_elf_allocate_object (abfd, sizeof (struct elf_s390_obj_tdata));
}

static bool
elf_s390_object_p (bfd *abfd)
{
  /* Set the right machine number for an s390 elf32 file.  */
  return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_64);
}

/* s390 ELF linker hash table.  */

struct elf_s390_link_hash_table
{
  struct elf_link_hash_table elf;

  /* Short-cuts to get to dynamic linker sections.  */
  asection *irelifunc;
  asection *plt_eh_frame;

  sframe_encoder_ctx *plt_cfe_ctx;
  asection *plt_sframe;
  /* The .sframe helper object for .plt section.  */
  const struct elf_s390x_sframe_plt *sframe_plt;

  union {
    bfd_signed_vma refcount;
    bfd_vma offset;
  } tls_ldm_got;

  /* Options passed from the linker.  */
  struct s390_elf_params *params;
};

/* Get the s390 ELF linker hash table from a link_info structure.  */

#define elf_s390_hash_table(p)            \
  ((is_elf_hash_table ((p)->hash)          \
    && elf_hash_table_id (elf_hash_table (p)) == S390_ELF_DATA)   \
   ? (struct elf_s390_link_hash_table *) (p)->hash : NULL)

#define ELF64 1
#include "elf-s390-common.c"

/* Create an entry in an s390 ELF linker hash table.  */

static struct bfd_hash_entry *
link_hash_newfunc (struct bfd_hash_entry *entry,
       struct bfd_hash_table *table,
       const char *string)
{
  /* Allocate the structure if it has not already been allocated by a
     subclass.  */
  if (entry == NULL)
    {
      entry = bfd_hash_allocate (table,
         sizeof (struct elf_s390_link_hash_entry));
      if (entry == NULL)
  return entry;
    }

  /* Call the allocation method of the superclass.  */
  entry = _bfd_elf_link_hash_newfunc (entry, table, string);
  if (entry != NULL)
    {
      struct elf_s390_link_hash_entry *eh;

      eh = (struct elf_s390_link_hash_entry *) entry;
      eh->gotplt_refcount = 0;
      eh->tls_type = GOT_UNKNOWN;
      eh->ifunc_resolver_address = 0;
      eh->ifunc_resolver_section = NULL;
    }

  return entry;
}

static void
elf_s390_link_hash_table_free (bfd *obfd)
{
  struct elf_s390_link_hash_table *htab
    = (struct elf_s390_link_hash_table *) obfd->link.hash;
  sframe_encoder_free (&htab->plt_cfe_ctx);
  _bfd_elf_link_hash_table_free (obfd);
}

/* Create an s390 ELF linker hash table.  */

static struct bfd_link_hash_table *
elf_s390_link_hash_table_create (bfd *abfd)
{
  struct elf_s390_link_hash_table *ret;

  ret = bfd_zmalloc (sizeof (*ret));
  if (ret == NULL)
    return NULL;

  if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc,
              sizeof (struct elf_s390_link_hash_entry)))
    {
      free (ret);
      return NULL;
    }
  ret->elf.root.hash_table_free = elf_s390_link_hash_table_free;

  return &ret->elf.root;
}

/* Copy the extra info we tack onto an elf_link_hash_entry.  */

static void
elf_s390_copy_indirect_symbol (struct bfd_link_info *info,
             struct elf_link_hash_entry *dir,
             struct elf_link_hash_entry *ind)
{
  struct elf_s390_link_hash_entry *edir, *eind;

  edir = (struct elf_s390_link_hash_entry *) dir;
  eind = (struct elf_s390_link_hash_entry *) ind;

  if (ind->root.type == bfd_link_hash_indirect
      && dir->got.refcount <= 0)
    {
      edir->tls_type = eind->tls_type;
      eind->tls_type = GOT_UNKNOWN;
    }

  if (ELIMINATE_COPY_RELOCS
      && ind->root.type != bfd_link_hash_indirect
      && dir->dynamic_adjusted)
    {
      /* If called to transfer flags for a weakdef during processing
   of elf_adjust_dynamic_symbol, don't copy non_got_ref.
   We clear it ourselves for ELIMINATE_COPY_RELOCS.  */
      if (dir->versioned != versioned_hidden)
  dir->ref_dynamic |= ind->ref_dynamic;
      dir->ref_regular |= ind->ref_regular;
      dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
      dir->needs_plt |= ind->needs_plt;
      dir->pointer_equality_needed |= ind->pointer_equality_needed;
    }
  else
    _bfd_elf_link_hash_copy_indirect (info, dir, ind);
}

static int
elf_s390_tls_transition (struct bfd_link_info *info,
       int r_type,
       int is_local)
{
  if (bfd_link_dll (info))
    return r_type;

  switch (r_type)
    {
    case R_390_TLS_GD64:
    case R_390_TLS_IE64:
      if (is_local)
  return R_390_TLS_LE64;
      return R_390_TLS_IE64;
    case R_390_TLS_GOTIE64:
      if (is_local)
  return R_390_TLS_LE64;
      return R_390_TLS_GOTIE64;
    case R_390_TLS_LDM64:
      return R_390_TLS_LE64;
    }

  return r_type;
}

/* Look through the relocs for a section during the first phase, and
   allocate space in the global offset table or procedure linkage
   table.  */

static bool
elf_s390_check_relocs (bfd *abfd,
           struct bfd_link_info *info,
           asection *sec,
           const Elf_Internal_Rela *relocs)
{
  struct elf_s390_link_hash_table *htab;
  Elf_Internal_Shdr *symtab_hdr;
  struct elf_link_hash_entry **sym_hashes;
  const Elf_Internal_Rela *rel;
  const Elf_Internal_Rela *rel_end;
  asection *sreloc;
  bfd_signed_vma *local_got_refcounts;
  int tls_type, old_tls_type;

  if (bfd_link_relocatable (info))
    return true;

  BFD_ASSERT (is_s390_elf (abfd));

  htab = elf_s390_hash_table (info);
  if (htab == NULL)
    return false;

  symtab_hdr = &elf_symtab_hdr (abfd);
  sym_hashes = elf_sym_hashes (abfd);
  local_got_refcounts = elf_local_got_refcounts (abfd);

  sreloc = NULL;

  rel_end = relocs + sec->reloc_count;
  for (rel = relocs; rel < rel_end; rel++)
    {
      unsigned int r_type;
      unsigned int r_symndx;
      struct elf_link_hash_entry *h;
      Elf_Internal_Sym *isym;

      r_symndx = ELF64_R_SYM (rel->r_info);

      if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
  {
    /* xgettext:c-format */
    _bfd_error_handler (_("%pB: bad symbol index: %d"),
            abfd, r_symndx);
    return false;
  }

      if (r_symndx < symtab_hdr->sh_info)
  {
    /* A local symbol.  */
    isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
          abfd, r_symndx);
    if (isym == NULL)
      return false;

    if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
      {
        struct plt_entry *plt;

        if (htab->elf.dynobj == NULL)
    htab->elf.dynobj = abfd;

        if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info))
    return false;

        if (local_got_refcounts == NULL)
    {
      if (!elf_s390_allocate_local_syminfo (abfd, symtab_hdr))
        return false;
      local_got_refcounts = elf_local_got_refcounts (abfd);
    }
        plt = elf_s390_local_plt (abfd);
        plt[r_symndx].plt.refcount++;
      }
    h = NULL;
  }
      else
  {
    h = sym_hashes[r_symndx - symtab_hdr->sh_info];
    while (h->root.type == bfd_link_hash_indirect
     || h->root.type == bfd_link_hash_warning)
      h = (struct elf_link_hash_entry *) h->root.u.i.link;
  }

      /* Create got section and local_got_refcounts array if they
   are needed.  */
      r_type = elf_s390_tls_transition (info,
          ELF64_R_TYPE (rel->r_info),
          h == NULL);
      switch (r_type)
  {
  case R_390_GOT12:
  case R_390_GOT16:
  case R_390_GOT20:
  case R_390_GOT32:
  case R_390_GOT64:
  case R_390_GOTENT:
  case R_390_GOTPLT12:
  case R_390_GOTPLT16:
  case R_390_GOTPLT20:
  case R_390_GOTPLT32:
  case R_390_GOTPLT64:
  case R_390_GOTPLTENT:
  case R_390_TLS_GD64:
  case R_390_TLS_GOTIE12:
  case R_390_TLS_GOTIE20:
  case R_390_TLS_GOTIE64:
  case R_390_TLS_IEENT:
  case R_390_TLS_IE64:
  case R_390_TLS_LDM64:
    if (h == NULL
        && local_got_refcounts == NULL)
      {
        if (!elf_s390_allocate_local_syminfo (abfd, symtab_hdr))
    return false;
        local_got_refcounts = elf_local_got_refcounts (abfd);
      }

    /* Fall through.  */
  case R_390_GOTOFF16:
  case R_390_GOTOFF32:
  case R_390_GOTOFF64:
  case R_390_GOTPC:
  case R_390_GOTPCDBL:
    if (htab->elf.sgot == NULL)
      {
        if (htab->elf.dynobj == NULL)
    htab->elf.dynobj = abfd;
        if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
    return false;
      }
  }

      if (h != NULL)
  {
    if (htab->elf.dynobj == NULL)
      htab->elf.dynobj = abfd;
    if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info))
      return false;

    /* Make sure an IFUNC symbol defined in a non-shared object
       always gets a PLT slot.  */
    if (s390_is_ifunc_symbol_p (h) && h->def_regular)
      {
        /* The symbol is called by the dynamic loader in order
     to resolve the relocation.  So it is in fact also
     referenced.  */
        h->ref_regular = 1;
        h->needs_plt = 1;
        h->pointer_equality_needed = 1;
      }
  }

      switch (r_type)
  {
  case R_390_GOTPC:
  case R_390_GOTPCDBL:
    /* These relocs do not need a GOT slot.  They just load the
       GOT pointer itself or address something else relative to
       the GOT.  Since the GOT pointer has been set up above we
       are done.  */
    break;
  case R_390_GOTOFF16:
  case R_390_GOTOFF32:
  case R_390_GOTOFF64:
    if (h == NULL || !s390_is_ifunc_symbol_p (h) || !h->def_regular)
      break;
    /* Fall through.  */

  case R_390_PLT12DBL:
  case R_390_PLT16DBL:
  case R_390_PLT24DBL:
  case R_390_PLT32:
  case R_390_PLT32DBL:
  case R_390_PLT64:
  case R_390_PLTOFF16:
  case R_390_PLTOFF32:
  case R_390_PLTOFF64:
    /* This symbol requires a procedure linkage table entry.  We
       actually build the entry in adjust_dynamic_symbol,
       because this might be a case of linking PIC code which is
       never referenced by a dynamic object, in which case we
       don't need to generate a procedure linkage table entry
       after all.  */

    /* If this is a local symbol, we resolve it directly without
       creating a procedure linkage table entry.  */
    if (h != NULL)
      {
        h->needs_plt = 1;
        h->plt.refcount += 1;

        /* GCC 12-14 unconditionally suffix non-local symbols
     with @PLT, regardless of whether they are used in
     function call instructions (i.e. brasl) or address
     taking instructions (i.e. larl).  Treat PLT32DBL
     relocation for "larl rX,<sym>@PLT" instruction as
     address taking and require pointer equality.  */
        if (bfd_link_executable (info)
      && r_type == R_390_PLT32DBL
      && rel->r_offset >= 2)
    {
      bfd_byte *contents;
      void *insn_start;
      uint16_t op;

      if (elf_section_data (sec)->this_hdr.contents != NULL)
        contents = elf_section_data (sec)->this_hdr.contents;
      else if (!_bfd_elf_mmap_section_contents (abfd, sec, &contents))
        return false;

      insn_start = contents + rel->r_offset - 2;
      op = bfd_get_16 (abfd, insn_start) & 0xff0f;

      if (op == 0xc000)
        {
          /* larl rX,<sym>@PLT  */
          h->pointer_equality_needed = 1;
        }

      if (elf_section_data (sec)->this_hdr.contents != contents)
        _bfd_elf_munmap_section_contents (sec, contents);
    }
      }
    break;

  case R_390_GOTPLT12:
  case R_390_GOTPLT16:
  case R_390_GOTPLT20:
  case R_390_GOTPLT32:
  case R_390_GOTPLT64:
  case R_390_GOTPLTENT:
    /* This symbol requires either a procedure linkage table entry
       or an entry in the local got. We actually build the entry
       in adjust_dynamic_symbol because whether this is really a
       global reference can change and with it the fact if we have
       to create a plt entry or a local got entry. To be able to
       make a once global symbol a local one we have to keep track
       of the number of gotplt references that exist for this
       symbol.  */
    if (h != NULL)
      {
        ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++;
        h->needs_plt = 1;
        h->plt.refcount += 1;
      }
    else
      local_got_refcounts[r_symndx] += 1;
    break;

  case R_390_TLS_LDM64:
    htab->tls_ldm_got.refcount += 1;
    break;

  case R_390_TLS_IE64:
  case R_390_TLS_GOTIE12:
  case R_390_TLS_GOTIE20:
  case R_390_TLS_GOTIE64:
  case R_390_TLS_IEENT:
    if (bfd_link_dll (info))
      info->flags |= DF_STATIC_TLS;
    /* Fall through */

  case R_390_GOT12:
  case R_390_GOT16:
  case R_390_GOT20:
  case R_390_GOT32:
  case R_390_GOT64:
  case R_390_GOTENT:
  case R_390_TLS_GD64:
    /* This symbol requires a global offset table entry.  */
    switch (r_type)
      {
      default:
      case R_390_GOT12:
      case R_390_GOT16:
      case R_390_GOT20:
      case R_390_GOT32:
      case R_390_GOTENT:
        tls_type = GOT_NORMAL;
        break;
      case R_390_TLS_GD64:
        tls_type = GOT_TLS_GD;
        break;
      case R_390_TLS_IE64:
      case R_390_TLS_GOTIE64:
        tls_type = GOT_TLS_IE;
        break;
      case R_390_TLS_GOTIE12:
      case R_390_TLS_GOTIE20:
      case R_390_TLS_IEENT:
        tls_type = GOT_TLS_IE_NLT;
        break;
      }

    if (h != NULL)
      {
        h->got.refcount += 1;
        old_tls_type = elf_s390_hash_entry(h)->tls_type;
      }
    else
      {
        local_got_refcounts[r_symndx] += 1;
        old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx];
      }
    /* If a TLS symbol is accessed using IE at least once,
       there is no point to use dynamic model for it.  */
    if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN)
      {
        if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL)
    {
      _bfd_error_handler
        /* xgettext:c-format */
        (_("%pB: `%s' accessed both as normal and thread local symbol"),
         abfd, h->root.root.string);
      return false;
    }
        if (old_tls_type > tls_type)
    tls_type = old_tls_type;
      }

    if (old_tls_type != tls_type)
      {
        if (h != NULL)
    elf_s390_hash_entry (h)->tls_type = tls_type;
        else
    elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type;
      }

    if (r_type != R_390_TLS_IE64)
      break;
    /* Fall through */

  case R_390_TLS_LE64:
    /* For static linking and executables this reloc will be
       calculated at linktime otherwise a TLS_TPOFF runtime
       reloc will be generated.  */
    if (r_type == R_390_TLS_LE64 && bfd_link_pie (info))
      break;

    if (!bfd_link_dll (info))
      break;
    info->flags |= DF_STATIC_TLS;
    /* Fall through */

  case R_390_8:
  case R_390_16:
  case R_390_32:
  case R_390_64:
  case R_390_PC12DBL:
  case R_390_PC16:
  case R_390_PC16DBL:
  case R_390_PC24DBL:
  case R_390_PC32:
  case R_390_PC32DBL:
  case R_390_PC64:
    if (h != NULL && bfd_link_executable (info))
      {
        /* If this reloc is in a read-only section, we might
     need a copy reloc.  We can't check reliably at this
     stage whether the section is read-only, as input
     sections have not yet been mapped to output sections.
     Tentatively set the flag for now, and correct in
     adjust_dynamic_symbol.  */
        h->non_got_ref = 1;

        if (!bfd_link_pic (info))
    {
      /* We may need a .plt entry if the function this reloc
         refers to is in a shared lib.  */
      h->plt.refcount += 1;
    }

        /* Require pointer equality in PDE for above PC-relative
     relocations, that are likely in address taken context,
     and direct relocations, that are likely in function
     reference context.  */
        h->pointer_equality_needed = 1;
      }

    /* If we are creating a shared library, and this is a reloc
       against a global symbol, or a non PC relative reloc
       against a local symbol, then we need to copy the reloc
       into the shared library.  However, if we are linking with
       -Bsymbolic, we do not need to copy a reloc against a
       global symbol which is defined in an object we are
       including in the link (i.e., DEF_REGULAR is set).  At
       this point we have not seen all the input files, so it is
       possible that DEF_REGULAR is not set now but will be set
       later (it is never cleared).  In case of a weak definition,
       DEF_REGULAR may be cleared later by a strong definition in
       a shared library. We account for that possibility below by
       storing information in the relocs_copied field of the hash
       table entry.  A similar situation occurs when creating
       shared libraries and symbol visibility changes render the
       symbol local.

       If on the other hand, we are creating an executable, we
       may need to keep relocations for symbols satisfied by a
       dynamic library if we manage to avoid copy relocs for the
       symbol.  */
    if ((bfd_link_pic (info)
         && (sec->flags & SEC_ALLOC) != 0
         && ((ELF64_R_TYPE (rel->r_info) != R_390_PC16
        && ELF64_R_TYPE (rel->r_info) != R_390_PC12DBL
        && ELF64_R_TYPE (rel->r_info) != R_390_PC16DBL
        && ELF64_R_TYPE (rel->r_info) != R_390_PC24DBL
        && ELF64_R_TYPE (rel->r_info) != R_390_PC32
        && ELF64_R_TYPE (rel->r_info) != R_390_PC32DBL
        && ELF64_R_TYPE (rel->r_info) != R_390_PC64)
       || (h != NULL
           && (! SYMBOLIC_BIND (info, h)
         || h->root.type == bfd_link_hash_defweak
         || !h->def_regular))))
        || (ELIMINATE_COPY_RELOCS
      && !bfd_link_pic (info)
      && (sec->flags & SEC_ALLOC) != 0
      && h != NULL
      && (h->root.type == bfd_link_hash_defweak
          || !h->def_regular)))
      {
        struct elf_dyn_relocs *p;
        struct elf_dyn_relocs **head;

        /* We must copy these reloc types into the output file.
     Create a reloc section in dynobj and make room for
     this reloc.  */
        if (sreloc == NULL)
    {
      if (htab->elf.dynobj == NULL)
        htab->elf.dynobj = abfd;

      sreloc = _bfd_elf_make_dynamic_reloc_section
        (sec, htab->elf.dynobj, 3, abfd, /*rela?*/ true);

      if (sreloc == NULL)
        return false;
    }

        /* If this is a global symbol, we count the number of
     relocations we need for this symbol.  */
        if (h != NULL)
    {
      head = &h->dyn_relocs;
    }
        else
    {
      /* Track dynamic relocs needed for local syms too.
         We really need local syms available to do this
         easily.  Oh well.  */
      asection *s;
      void *vpp;

      isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
            abfd, r_symndx);
      if (isym == NULL)
        return false;

      s = bfd_section_from_elf_index (abfd, isym->st_shndx);
      if (s == NULL)
        s = sec;

      vpp = &elf_section_data (s)->local_dynrel;
      head = (struct elf_dyn_relocs **) vpp;
    }

        p = *head;
        if (p == NULL || p->sec != sec)
    {
      size_t amt = sizeof *p;
      p = ((struct elf_dyn_relocs *)
           bfd_alloc (htab->elf.dynobj, amt));
      if (p == NULL)
        return false;
      p->next = *head;
      *head = p;
      p->sec = sec;
      p->count = 0;
      p->pc_count = 0;
    }

        p->count += 1;
        if (ELF64_R_TYPE (rel->r_info) == R_390_PC16
      || ELF64_R_TYPE (rel->r_info) == R_390_PC12DBL
      || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL
      || ELF64_R_TYPE (rel->r_info) == R_390_PC24DBL
      || ELF64_R_TYPE (rel->r_info) == R_390_PC32
      || ELF64_R_TYPE (rel->r_info) == R_390_PC32DBL
      || ELF64_R_TYPE (rel->r_info) == R_390_PC64)
    p->pc_count += 1;
      }
    break;

    /* This relocation describes the C++ object vtable hierarchy.
       Reconstruct it for later use during GC.  */
  case R_390_GNU_VTINHERIT:
    if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
      return false;
    break;

    /* This relocation describes which C++ vtable entries are actually
       used.  Record for later use during GC.  */
  case R_390_GNU_VTENTRY:
    if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
      return false;
    break;

  default:
    break;
  }
    }

  return true;
}

/* Return the section that should be marked against GC for a given
   relocation.  */

static asection *
elf_s390_gc_mark_hook (asection *sec,
           struct bfd_link_info *info,
           struct elf_reloc_cookie *cookie,
           struct elf_link_hash_entry *h,
           unsigned int symndx)
{
  if (h != NULL)
    switch (ELF64_R_TYPE (cookie->rel->r_info))
      {
      case R_390_GNU_VTINHERIT:
      case R_390_GNU_VTENTRY:
  return NULL;
      }

  return _bfd_elf_gc_mark_hook (sec, info, cookie, h, symndx);
}

/* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
   entry but we found we will not create any.  Called when we find we will
   not have any PLT for this symbol, by for example
   elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link,
   or elf_s390_late_size_sections if no dynamic sections will be
   created (we're only linking static objects).  */

static void
elf_s390_adjust_gotplt (struct elf_s390_link_hash_entry *h)
{
  if (h->elf.root.type == bfd_link_hash_warning)
    h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link;

  if (h->gotplt_refcount <= 0)
    return;

  /* We simply add the number of gotplt references to the number
   * of got references for this symbol.  */
  h->elf.got.refcount += h->gotplt_refcount;
  h->gotplt_refcount = -1;
}

/* Adjust a symbol defined by a dynamic object and referenced by a
   regular object.  The current definition is in some section of the
   dynamic object, but we're not including those sections.  We have to
   change the definition to something the rest of the link can
   understand.  */

static bool
elf_s390_adjust_dynamic_symbol (struct bfd_link_info *info,
        struct elf_link_hash_entry *h)
{
  struct elf_s390_link_hash_table *htab;
  asection *s, *srel;

  /* STT_GNU_IFUNC symbol must go through PLT. */
  if (s390_is_ifunc_symbol_p (h))
    {
      /* All local STT_GNU_IFUNC references must be treated as local
   calls via local PLT.  */
      if (h->ref_regular && SYMBOL_CALLS_LOCAL (info, h))
  {
    bfd_size_type pc_count = 0, count = 0;
    struct elf_dyn_relocs **pp;
    struct elf_dyn_relocs *p;

    for (pp = &h->dyn_relocs; (p = *pp) != NULL; )
      {
        pc_count += p->pc_count;
        p->count -= p->pc_count;
        p->pc_count = 0;
        count += p->count;
        if (p->count == 0)
    *pp = p->next;
        else
    pp = &p->next;
      }

    if (pc_count || count)
      {
        h->needs_plt = 1;
        h->non_got_ref = 1;
        if (h->plt.refcount <= 0)
    h->plt.refcount = 1;
        else
    h->plt.refcount += 1;
      }
  }

      if (h->plt.refcount <= 0)
  {
    h->plt.offset = (bfd_vma) -1;
    h->needs_plt = 0;
  }
      return true;
    }

  /* If this is a function, put it in the procedure linkage table.  We
     will fill in the contents of the procedure linkage table later
     (although we could actually do it here).  */
  if (h->type == STT_FUNC
      || h->needs_plt)
    {
      if (h->plt.refcount <= 0
    || SYMBOL_CALLS_LOCAL (info, h)
    || UNDEFWEAK_NO_DYNAMIC_RELOC (info, h))
  {
    /* This case can occur if we saw a PLT32 reloc in an input
       file, but the symbol was never referred to by a dynamic
       object, or if all references were garbage collected.  In
       such a case, we don't actually need to build a procedure
       linkage table, and we can just do a PC32 reloc instead.  */
    h->plt.offset = (bfd_vma) -1;
    h->needs_plt = 0;
    elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
  }

      return true;
    }
  else
    /* It's possible that we incorrectly decided a .plt reloc was
       needed for an R_390_PC32 reloc to a non-function sym in
       check_relocs.  We can't decide accurately between function and
       non-function syms in check-relocs;  Objects loaded later in
       the link may change h->type.  So fix it now.  */
    h->plt.offset = (bfd_vma) -1;

  /* If this is a weak symbol, and there is a real definition, the
     processor independent code will have arranged for us to see the
     real definition first, and we can just use the same value.  */
  if (h->is_weakalias)
    {
      struct elf_link_hash_entry *def = weakdef (h);
      BFD_ASSERT (def->root.type == bfd_link_hash_defined);
      h->root.u.def.section = def->root.u.def.section;
      h->root.u.def.value = def->root.u.def.value;
      if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
  h->non_got_ref = def->non_got_ref;
      return true;
    }

  /* This is a reference to a symbol defined by a dynamic object which
     is not a function.  */

  /* If we are creating a shared library, we must presume that the
     only references to the symbol are via the global offset table.
     For such cases we need not do anything here; the relocations will
     be handled correctly by relocate_section.  */
  if (bfd_link_pic (info))
    return true;

  /* If there are no references to this symbol that do not use the
     GOT, we don't need to generate a copy reloc.  */
  if (!h->non_got_ref)
    return true;

  /* If -z nocopyreloc was given, we won't generate them either.  */
  if (info->nocopyreloc)
    {
      h->non_got_ref = 0;
      return true;
    }

  /* If we don't find any dynamic relocs in read-only sections, then
     we'll be keeping the dynamic relocs and avoiding the copy reloc.  */
  if (ELIMINATE_COPY_RELOCS && !_bfd_elf_readonly_dynrelocs (h))
    {
      h->non_got_ref = 0;
      return true;
    }

  /* We must allocate the symbol in our .dynbss section, which will
     become part of the .bss section of the executable.  There will be
     an entry for this symbol in the .dynsym section.  The dynamic
     object will contain position independent code, so all references
     from the dynamic object to this symbol will go through the global
     offset table.  The dynamic linker will use the .dynsym entry to
     determine the address it must put in the global offset table, so
     both the dynamic object and the regular object will refer to the
     same memory location for the variable.  */

  htab = elf_s390_hash_table (info);
  if (htab == NULL)
    return false;

  /* We must generate a R_390_COPY reloc to tell the dynamic linker to
     copy the initial value out of the dynamic object and into the
     runtime process image.  */
  if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
    {
      s = htab->elf.sdynrelro;
      srel = htab->elf.sreldynrelro;
    }
  else
    {
      s = htab->elf.sdynbss;
      srel = htab->elf.srelbss;
    }
  if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
    {
      srel->size += sizeof (Elf64_External_Rela);
      h->needs_copy = 1;
    }

  return _bfd_elf_adjust_dynamic_copy (info, h, s);
}

/* Create SFrame stack trace info for the PLT entries in the .plt section.  */

static bool
_bfd_s390_elf_create_sframe_plt (struct bfd_link_info *info)
{
  struct elf_s390_link_hash_table *htab;

  unsigned int plt0_entry_size;
  unsigned char func_info;
  uint32_t fre_type;
  /* The dynamic plt section for which .sframe stack trace information is being
     created.  */
  asection *dpltsec;

  int err = 0;

  sframe_encoder_ctx **ectx = NULL;
  unsigned plt_entry_size = 0;
  unsigned int num_pltn_fres = 0;
  unsigned int num_pltn_entries = 0;
  const sframe_frame_row_entry * const *pltn_fres;

  htab = elf_s390_hash_table (info);
  ectx = &htab->plt_cfe_ctx;
  dpltsec = htab->elf.splt;

  plt0_entry_size = htab->sframe_plt->plt0_entry_size;
  plt_entry_size = htab->sframe_plt->pltn_entry_size;
  pltn_fres = htab->sframe_plt->pltn_fres;
  num_pltn_fres = htab->sframe_plt->pltn_num_fres;
  num_pltn_entries = (dpltsec->size - plt0_entry_size) / plt_entry_size;

  *ectx = sframe_encode (SFRAME_VERSION_3,
       SFRAME_F_FDE_FUNC_START_PCREL,
       SFRAME_ABI_S390X_ENDIAN_BIG,
       SFRAME_CFA_FIXED_FP_INVALID,
       SFRAME_CFA_FIXED_RA_INVALID,
       &err);

  /* FRE type is dependent on the size of the function.  */
  fre_type = sframe_calc_fre_type (dpltsec->size);
  func_info = sframe_fde_create_func_info (fre_type, SFRAME_V3_FDE_PCTYPE_INC);

  /* Add SFrame FDE and the associated FREs for PLT0 if PLT0 has been
     generated.  */
  if (plt0_entry_size)
    {
      /* Add SFrame FDE for PLT0, the function start address is updated later
   at _bfd_elf_merge_section_sframe time.  */
      sframe_encoder_add_funcdesc_v3 (*ectx,
              0, /* func start addr.  */
              plt0_entry_size,
              func_info,
              0, /* func_info2.  */
              0, /* Rep block size.  */
              0 /* Num FREs.  */);
      sframe_frame_row_entry plt0_fre;
      unsigned int num_plt0_fres = htab->sframe_plt->plt0_num_fres;
      for (unsigned int j = 0; j < num_plt0_fres; j++)
  {
    plt0_fre = *(htab->sframe_plt->plt0_fres[j]);
    sframe_encoder_add_fre (*ectx, 0, &plt0_fre);
  }
    }

  if (num_pltn_entries)
    {
      /* PLTn entries use an SFrame FDE of type
   SFRAME_V3_FDE_PCTYPE_MASK to exploit the repetitive
   pattern of the instructions in these entries.  Using this SFrame FDE
   type helps in keeping the SFrame stack trace info for PLTn entries
   compact.  */
      func_info = sframe_fde_create_func_info (fre_type,
                 SFRAME_V3_FDE_PCTYPE_MASK);
      /* Add the SFrame FDE for all PCs starting at the first PLTn entry (hence,
   function start address = plt0_entry_size.  As usual, this will be
   updated later at _bfd_elf_merge_section_sframe, by when the
   sections are relocated.  */
      sframe_encoder_add_funcdesc_v3 (*ectx,
              plt0_entry_size, /* func start addr.  */
              dpltsec->size - plt0_entry_size,
              func_info,
              0, /* func_info2.  */
              plt_entry_size,
              0 /* Num FREs.  */);

      sframe_frame_row_entry pltn_fre;
      /* Now add the FREs for PLTn.  Simply adding the FREs suffices due
   to the usage of SFRAME_V3_FDE_PCTYPE_MASK above.  */
      for (unsigned int j = 0; j < num_pltn_fres; j++)
  {
    unsigned int func_idx = plt0_entry_size ? 1 : 0;
    pltn_fre = *(pltn_fres[j]);
    sframe_encoder_add_fre (*ectx, func_idx, &pltn_fre);
  }
    }

  return true;
}

/* Write contents of the .sframe section.  */

static bool
_bfd_s390_elf_write_sframe_plt (struct bfd_link_info *info)
{
  struct elf_s390_link_hash_table *htab;
  sframe_encoder_ctx **ectx;
  size_t sec_size;
  asection *sec;
  bfd *dynobj;

  int err = 0;

  htab = elf_s390_hash_table (info);
  dynobj = htab->elf.dynobj;

  ectx = &htab->plt_cfe_ctx;
  sec = htab->plt_sframe;

  BFD_ASSERT (*ectx);

  void *contents = sframe_encoder_write (*ectx, &sec_size, false, &err);

  sec->size = (bfd_size_type) sec_size;
  sec->contents = (unsigned char *) bfd_zalloc (dynobj, sec->size);
  sec->alloced = 1;
  memcpy (sec->contents, contents, sec_size);

  sframe_encoder_free (ectx);

  return true;
}

/* Allocate space in .plt, .got and associated reloc sections for
   dynamic relocs.  */

static bool
allocate_dynrelocs (struct elf_link_hash_entry *h,
        void * inf)
{
  struct bfd_link_info *info;
  struct elf_s390_link_hash_table *htab;
  struct elf_dyn_relocs *p;

  if (h->root.type == bfd_link_hash_indirect)
    return true;

  info = (struct bfd_link_info *) inf;
  htab = elf_s390_hash_table (info);
  if (htab == NULL)
    return false;

  /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
     here if it is defined and referenced in a non-shared object.  */
  if (s390_is_ifunc_symbol_p (h) && h->def_regular)
    return s390_elf_allocate_ifunc_dyn_relocs (info, h);
  else if (htab->elf.dynamic_sections_created
     && h->plt.refcount > 0)
    {
      /* Make sure this symbol is output as a dynamic symbol.
   Undefined weak syms won't yet be marked as dynamic.  */
      if (h->dynindx == -1
    && !h->forced_local)
  {
    if (! bfd_elf_link_record_dynamic_symbol (info, h))
      return false;
  }

      if (bfd_link_pic (info)
    || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
  {
    asection *s = htab->elf.splt;

    /* If this is the first .plt entry, make room for the special
       first entry.  */
    if (s->size == 0)
      s->size += PLT_FIRST_ENTRY_SIZE;

    h->plt.offset = s->size;

    /* If this symbol is not defined in a regular file, and we are
       not generating a shared library, then set the symbol to this
       location in the .plt.  This is required to make function
       pointers compare as equal between the normal executable and
       the shared library.  */
    if (! bfd_link_pic (info)
        && !h->def_regular)
      {
        h->root.u.def.section = s;
        h->root.u.def.value = h->plt.offset;
      }

    /* Make room for this entry.  */
    s->size += PLT_ENTRY_SIZE;

    /* We also need to make an entry in the .got.plt section.  */
    htab->elf.sgotplt->size += GOT_ENTRY_SIZE;

    /* We also need to make an entry in the .rela.plt section.  */
    htab->elf.srelplt->size += sizeof (Elf64_External_Rela);
  }
      else
  {
    h->plt.offset = (bfd_vma) -1;
    h->needs_plt = 0;
    elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
  }
    }
  else
    {
      h->plt.offset = (bfd_vma) -1;
      h->needs_plt = 0;
      elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
    }

  /* If R_390_TLS_{IE64,GOTIE64,GOTIE12,GOTIE20,IEENT} symbol is now local to
     the binary, we can optimize a bit. IE64 and GOTIE64 get converted
     to R_390_TLS_LE64 requiring no TLS entry. For GOTIE12, GOTIE20, and IEENT
     we can save the dynamic TLS relocation.  */
  if (h->got.refcount > 0
      && !bfd_link_dll (info)
      && h->dynindx == -1
      && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE)
    {
      if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT)
  /* For the GOTIE access without a literal pool entry the offset has
     to be stored somewhere. The immediate value in the instruction
     is not bit enough so the value is stored in the got.  */
  {
    h->got.offset = htab->elf.sgot->size;
    htab->elf.sgot->size += GOT_ENTRY_SIZE;
  }
      else
  h->got.offset = (bfd_vma) -1;
    }
  else if (h->got.refcount > 0)
    {
      asection *s;
      bool dyn;
      int tls_type = elf_s390_hash_entry(h)->tls_type;

      /* Make sure this symbol is output as a dynamic symbol.
   Undefined weak syms won't yet be marked as dynamic.  */
      if (h->dynindx == -1
    && !h->forced_local)
  {
    if (! bfd_elf_link_record_dynamic_symbol (info, h))
      return false;
  }

      s = htab->elf.sgot;
      h->got.offset = s->size;
      s->size += GOT_ENTRY_SIZE;
      /* R_390_TLS_GD64 needs 2 consecutive GOT slots.  */
      if (tls_type == GOT_TLS_GD)
  s->size += GOT_ENTRY_SIZE;
      dyn = htab->elf.dynamic_sections_created;
      /* R_390_TLS_IE64 needs one dynamic relocation,
   R_390_TLS_GD64 needs one if local symbol and two if global.  */
      if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
    || tls_type >= GOT_TLS_IE)
  htab->elf.srelgot->size += sizeof (Elf64_External_Rela);
      else if (tls_type == GOT_TLS_GD)
  htab->elf.srelgot->size += 2 * sizeof (Elf64_External_Rela);
      else if (!UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)
         && (bfd_link_pic (info)
       || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
  htab->elf.srelgot->size += sizeof (Elf64_External_Rela);
    }
  else
    h->got.offset = (bfd_vma) -1;

  if (h->dyn_relocs == NULL)
    return true;

  /* In the shared -Bsymbolic case, discard space allocated for
     dynamic pc-relative relocs against symbols which turn out to be
     defined in regular objects.  For the normal shared case, discard
     space for pc-relative relocs that have become local due to symbol
     visibility changes.  */

  if (bfd_link_pic (info))
    {
      if (SYMBOL_CALLS_LOCAL (info, h))
  {
    struct elf_dyn_relocs **pp;

    for (pp = &h->dyn_relocs; (p = *pp) != NULL; )
      {
        p->count -= p->pc_count;
        p->pc_count = 0;
        if (p->count == 0)
    *pp = p->next;
        else
    pp = &p->next;
      }
  }

      /* Also discard relocs on undefined weak syms with non-default
   visibility.  */
      if (h->dyn_relocs != NULL
    && h->root.type == bfd_link_hash_undefweak)
  {
    if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
        || UNDEFWEAK_NO_DYNAMIC_RELOC (info, h))
      h->dyn_relocs = NULL;

    /* Make sure undefined weak symbols are output as a dynamic
       symbol in PIEs.  */
    else if (h->dynindx == -1
       && !h->forced_local)
      {
        if (! bfd_elf_link_record_dynamic_symbol (info, h))
    return false;
      }
  }
    }
  else if (ELIMINATE_COPY_RELOCS)
    {
      /* For the non-shared case, discard space for relocs against
   symbols which turn out to need copy relocs or are not
   dynamic.  */

      if (!h->non_got_ref
    && ((h->def_dynamic
         && !h->def_regular)
        || (htab->elf.dynamic_sections_created
      && (h->root.type == bfd_link_hash_undefweak
          || h->root.type == bfd_link_hash_undefined))))
  {
    /* Make sure this symbol is output as a dynamic symbol.
       Undefined weak syms won't yet be marked as dynamic.  */
    if (h->dynindx == -1
        && !h->forced_local)
      {
        if (! bfd_elf_link_record_dynamic_symbol (info, h))
    return false;
      }

    /* If that succeeded, we know we'll be keeping all the
       relocs.  */
    if (h->dynindx != -1)
      goto keep;
  }

      h->dyn_relocs = NULL;

    keep: ;
    }

  /* Finally, allocate space.  */
  for (p = h->dyn_relocs; p != NULL; p = p->next)
    {
      asection *sreloc = elf_section_data (p->sec)->sreloc;
      sreloc->size += p->count * sizeof (Elf64_External_Rela);
    }

  return true;
}

/* Set the sizes of the dynamic sections.  */

static bool
elf_s390_late_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
           struct bfd_link_info *info)
{
  struct elf_s390_link_hash_table *htab;
  bfd *dynobj;
  asection *s;
  bool relocs;
  bfd *ibfd;

  htab = elf_s390_hash_table (info);
  if (htab == NULL)
    return false;

  dynobj = htab->elf.dynobj;
  if (dynobj == NULL)
    return true;

  if (htab->elf.dynamic_sections_created)
    {
      /* Set the contents of the .interp section to the interpreter.  */
      if (bfd_link_executable (info) && !info->nointerp)
  {
    s = htab->elf.interp;
    if (s == NULL)
      abort ();
    s->size = sizeof ELF_DYNAMIC_INTERPRETER;
    s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
    s->alloced = 1;
  }
    }

  if (htab->elf.sgot && s390_gotplt_after_got_p (info))
    {
      /* _bfd_elf_create_got_section adds the got header size always
   to .got.plt but we need it in .got if this section comes
   first.  */
      htab->elf.sgot->size += 3 * GOT_ENTRY_SIZE;
      htab->elf.sgotplt->size -= 3 * GOT_ENTRY_SIZE;

      /* Make the _GLOBAL_OFFSET_TABLE_ symbol point to the .got
   instead of .got.plt.  */
      htab->elf.hgot->root.u.def.section = htab->elf.sgot;
      htab->elf.hgot->root.u.def.value = 0;
    }

  /* Set up .got offsets for local syms, and space for local dynamic
     relocs.  */
  for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
    {
      bfd_signed_vma *local_got;
      bfd_signed_vma *end_local_got;
      char *local_tls_type;
      bfd_size_type locsymcount;
      Elf_Internal_Shdr *symtab_hdr;
      asection *srela;
      struct plt_entry *local_plt;
      unsigned int i;

      if (! is_s390_elf (ibfd))
  continue;

      for (s = ibfd->sections; s != NULL; s = s->next)
  {
    struct elf_dyn_relocs *p;

    for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next)
      {
        if (!bfd_is_abs_section (p->sec)
      && bfd_is_abs_section (p->sec->output_section))
    {
      /* Input section has been discarded, either because
         it is a copy of a linkonce section or due to
         linker script /DISCARD/, so we'll be discarding
         the relocs too.  */
    }
        else if (p->count != 0)
    {
      srela = elf_section_data (p->sec)->sreloc;
      srela->size += p->count * sizeof (Elf64_External_Rela);
      if ((p->sec->output_section->flags & SEC_READONLY) != 0)
        info->flags |= DF_TEXTREL;
    }
      }
  }

      local_got = elf_local_got_refcounts (ibfd);
      if (!local_got)
  continue;

      symtab_hdr = &elf_symtab_hdr (ibfd);
      locsymcount = symtab_hdr->sh_info;
      end_local_got = local_got + locsymcount;
      local_tls_type = elf_s390_local_got_tls_type (ibfd);
      s = htab->elf.sgot;
      srela = htab->elf.srelgot;
      for (; local_got < end_local_got; ++local_got, ++local_tls_type)
  {
    if (*local_got > 0)
      {
        *local_got = s->size;
        s->size += GOT_ENTRY_SIZE;
        if (*local_tls_type == GOT_TLS_GD)
    s->size += GOT_ENTRY_SIZE;
        if (bfd_link_pic (info))
    srela->size += sizeof (Elf64_External_Rela);
      }
    else
      *local_got = (bfd_vma) -1;
  }

      local_plt = elf_s390_local_plt (ibfd);
      for (i = 0; i < symtab_hdr->sh_info; i++)
  {
    if (local_plt[i].plt.refcount > 0)
      {
        local_plt[i].plt.offset = htab->elf.iplt->size;
        htab->elf.iplt->size += PLT_ENTRY_SIZE;
        htab->elf.igotplt->size += GOT_ENTRY_SIZE;
        htab->elf.irelplt->size += sizeof (Elf64_External_Rela);
      }
    else
      local_plt[i].plt.offset = (bfd_vma) -1;
  }
    }

  if (htab->tls_ldm_got.refcount > 0)
    {
      /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM64
   relocs.  */
      htab->tls_ldm_got.offset = htab->elf.sgot->size;
      htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
      htab->elf.srelgot->size += sizeof (Elf64_External_Rela);
    }
  else
    htab->tls_ldm_got.offset = -1;

  /* Allocate global sym .plt and .got entries, and space for global
     sym dynamic relocs.  */
  elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info);

  if (_bfd_elf_eh_frame_present (info))
    {
      if (htab->plt_eh_frame != NULL
    && htab->elf.splt != NULL
    && htab->elf.splt->size != 0
    && !bfd_is_abs_section (htab->elf.splt->output_section))
  htab->plt_eh_frame->size = sizeof (elf_s390x_eh_frame_plt);
    }

  /* No need to size the .sframe section explicitly because the write-out
     mechanism is different.  Simply prep up the FDE/FRE for the
     .plt section.  */
  if (_bfd_elf_sframe_present (info))
    {
      if (htab->plt_sframe != NULL
    && htab->elf.splt != NULL
    && htab->elf.splt->size != 0
    && !bfd_is_abs_section (htab->elf.splt->output_section))
  {
    _bfd_s390_elf_create_sframe_plt (info);
    /* FIXME - Dirty Hack.  Set the size to something non-zero for now,
       so that the section does not get stripped out below.  The precise
       size of this section is known only when the contents are
       serialized in _bfd_s390x_elf_write_sframe_plt.  */
    htab->plt_sframe->size = sizeof (sframe_header) + 1;
  }
    }

  /* We now have determined the sizes of the various dynamic sections.
     Allocate memory for them.  */
  relocs = false;
  for (s = dynobj->sections; s != NULL; s = s->next)
    {
      if ((s->flags & SEC_LINKER_CREATED) == 0)
  continue;

      if (s == htab->elf.splt
    || s == htab->elf.sgot
    || s == htab->elf.sgotplt
    || s == htab->plt_eh_frame
    || s == htab->plt_sframe
    || s == htab->elf.sdynbss
    || s == htab->elf.sdynrelro
    || s == htab->elf.iplt
    || s == htab->elf.igotplt
    || s == htab->irelifunc)
  {
    /* Strip this section if we don't need it; see the
       comment below.  */
  }
      else if (startswith (bfd_section_name (s), ".rela"))
  {
    if (s->size != 0 && s != htab->elf.srelplt)
      {
        relocs = true;
        if (s == htab->elf.irelplt)
    {
      /* In static-pie case, there are IRELATIVE-relocs in
         .rela.iplt (htab->irelplt), which will later be grouped
         to .rela.plt.  On s390, the IRELATIVE relocations are
         always located in .rela.iplt - even for non-static case.
         Ensure that DT_JMPREL, DT_PLTRELA, DT_PLTRELASZ is added
         to the dynamic section even if htab->srelplt->size == 0.
         See _bfd_elf_add_dynamic_tags in bfd/elflink.c.  */
      htab->elf.dt_jmprel_required = true;
    }
      }

    /* We use the reloc_count field as a counter if we need
       to copy relocs into the output file.  */
    s->reloc_count = 0;
  }
      else
  {
    /* It's not one of our sections, so don't allocate space.  */
    continue;
  }

      if (s->size == 0)
  {
    /* If we don't need this section, strip it from the
       output file.  This is to handle .rela.bss and
       .rela.plt.  We must create it in
       create_dynamic_sections, because it must be created
       before the linker maps input sections to output
       sections.  The linker does that before
       adjust_dynamic_symbol is called, and it is that
       function which decides whether anything needs to go
       into these sections.  */

    s->flags |= SEC_EXCLUDE;
    continue;
  }

      if ((s->flags & SEC_HAS_CONTENTS) == 0)
  continue;

      /* Skip allocating contents for .sframe section as it is written
   out differently.  See below.  */
      if (s == htab->plt_sframe)
  continue;

      /* Allocate memory for the section contents.  We use bfd_zalloc
   here in case unused entries are not reclaimed before the
   section's contents are written out.  This should not happen,
   but this way if it does, we get a R_390_NONE reloc instead
   of garbage.  */
      s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
      if (s->contents == NULL)
  return false;
      s->alloced = 1;
    }

  if (htab->plt_eh_frame != NULL
      && htab->plt_eh_frame->contents != NULL)
    {
      memcpy (htab->plt_eh_frame->contents,
        elf_s390x_eh_frame_plt,
        htab->plt_eh_frame->size);
      bfd_put_32 (dynobj, htab->elf.splt->size,
      htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
    }

  if (_bfd_elf_sframe_present (info))
    {
      if (htab->plt_sframe != NULL
    && htab->elf.splt != NULL
    && htab->elf.splt->size != 0
    && htab->plt_sframe->contents == NULL)
  _bfd_s390_elf_write_sframe_plt (info);
    }

  return _bfd_elf_add_dynamic_tags (output_bfd, info, relocs);
}

/* Return the base VMA address which should be subtracted from real addresses
   when resolving @dtpoff relocation.
   This is PT_TLS segment p_vaddr.  */

static bfd_vma
dtpoff_base (struct bfd_link_info *info)
{
  /* If tls_sec is NULL, we should have signalled an error already.  */
  if (elf_hash_table (info)->tls_sec == NULL)
    return 0;
  return elf_hash_table (info)->tls_sec->vma;
}

/* Return the relocation value for @tpoff relocation
   if STT_TLS virtual address is ADDRESS.  */

static bfd_vma
tpoff (struct bfd_link_info *info, bfd_vma address)
{
  struct elf_link_hash_table *htab = elf_hash_table (info);

  /* If tls_sec is NULL, we should have signalled an error already.  */
  if (htab->tls_sec == NULL)
    return 0;
  return htab->tls_size + htab->tls_sec->vma - address;
}

/* Complain if TLS instruction relocation is against an invalid
   instruction.  */

static void
invalid_tls_insn (bfd *input_bfd,
      asection *input_section,
      Elf_Internal_Rela *rel)
{
  reloc_howto_type *howto;

  howto = elf_howto_table + ELF64_R_TYPE (rel->r_info);
  _bfd_error_handler
    /* xgettext:c-format */
    (_("%pB(%pA+%#" PRIx64 "): invalid instruction for TLS relocation %s"),
     input_bfd,
     input_section,
     (uint64_t) rel->r_offset,
     howto->name);
  bfd_set_error (bfd_error_bad_value);
}

/* Relocate a 390 ELF section.  */

static int
elf_s390_relocate_section (bfd *output_bfd,
         struct bfd_link_info *info,
         bfd *input_bfd,
         asection *input_section,
         bfd_byte *contents,
         Elf_Internal_Rela *relocs,
         Elf_Internal_Sym *local_syms,
         asection **local_sections)
{
  struct elf_s390_link_hash_table *htab;
  Elf_Internal_Shdr *symtab_hdr;
  struct elf_link_hash_entry **sym_hashes;
  bfd_vma *local_got_offsets;
  Elf_Internal_Rela *rel;
  Elf_Internal_Rela *relend;

  if (!is_s390_elf (input_bfd))
    {
      bfd_set_error (bfd_error_wrong_format);
      return false;
    }

  htab = elf_s390_hash_table (info);
  if (htab == NULL)
    return false;

  symtab_hdr = &elf_symtab_hdr (input_bfd);
  sym_hashes = elf_sym_hashes (input_bfd);
  local_got_offsets = elf_local_got_offsets (input_bfd);

  rel = relocs;
  relend = relocs + input_section->reloc_count;
  for (; rel < relend; rel++)
    {
      unsigned int r_type;
      reloc_howto_type *howto;
      unsigned long r_symndx;
      struct elf_link_hash_entry *h;
      Elf_Internal_Sym *sym;
      asection *sec;
      bfd_vma off;
      bfd_vma relocation;
      bool unresolved_reloc;
      bfd_reloc_status_type r;
      int tls_type;
      bool resolved_to_zero;
      bool relax;

      r_type = ELF64_R_TYPE (rel->r_info);
      if (r_type == (int) R_390_GNU_VTINHERIT
    || r_type == (int) R_390_GNU_VTENTRY)
  continue;
      if (r_type >= (int) R_390_max)
  {
    bfd_set_error (bfd_error_bad_value);
    return false;
  }

      howto = elf_howto_table + r_type;
      r_symndx = ELF64_R_SYM (rel->r_info);

      h = NULL;
      sym = NULL;
      sec = NULL;
      unresolved_reloc = false;
      if (r_symndx < symtab_hdr->sh_info)
  {
    sym = local_syms + r_symndx;
    sec = local_sections[r_symndx];

    if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
      {
        struct plt_entry *local_plt = elf_s390_local_plt (input_bfd);
        if (local_plt == NULL)
    return false;

        /* Address of the PLT slot.  */
        relocation = (htab->elf.iplt->output_section->vma
          + htab->elf.iplt->output_offset
          + local_plt[r_symndx].plt.offset);

        switch (r_type)
    {
    case R_390_PLTOFF16:
    case R_390_PLTOFF32:
    case R_390_PLTOFF64:
      relocation -= s390_got_pointer (info);
      break;
    case R_390_GOTPLT12:
    case R_390_GOTPLT16:
    case R_390_GOTPLT20:
    case R_390_GOTPLT32:
    case R_390_GOTPLT64:
    case R_390_GOTPLTENT:
    case R_390_GOT12:
    case R_390_GOT16:
    case R_390_GOT20:
    case R_390_GOT32:
    case R_390_GOT64:
    case R_390_GOTENT:
      {
        /* Write the PLT slot address into the GOT slot.  */
        bfd_put_64 (output_bfd, relocation,
        htab->elf.sgot->contents +
        local_got_offsets[r_symndx]);
        relocation = (local_got_offsets[r_symndx] +
          s390_got_offset (info));

        if (r_type == R_390_GOTENT || r_type == R_390_GOTPLTENT)
          relocation += s390_got_pointer (info);
        break;
      }
    default:
      break;
    }
        /* The output section is needed later in
     finish_dynamic_section when creating the dynamic
     relocation.  */
        local_plt[r_symndx].sec = sec;
        goto do_relocation;
      }
    else
      relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
  }
      else
  {
    bool warned ATTRIBUTE_UNUSED;
    bool ignored ATTRIBUTE_UNUSED;

    RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
           r_symndx, symtab_hdr, sym_hashes,
           h, sec, relocation,
           unresolved_reloc, warned, ignored);
  }

      if (sec != NULL && discarded_section (sec))
  RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
           rel, 1, relend, R_390_NONE,
           howto, 0, contents);

      if (bfd_link_relocatable (info))
  continue;

      resolved_to_zero = (h != NULL
        && UNDEFWEAK_NO_DYNAMIC_RELOC (info, h));

      /* Rewrite instructions and related relocations if (1) relaxation
   disabled by default, (2) enabled by target, or (3) enabled by
   user.  Suppress rewriting if linker option --no-relax is used.  */
      relax = info->disable_target_specific_optimizations <= 1;

      switch (r_type)
  {
  case R_390_GOTPLT12:
  case R_390_GOTPLT16:
  case R_390_GOTPLT20:
  case R_390_GOTPLT32:
  case R_390_GOTPLT64:
  case R_390_GOTPLTENT:
    /* There are three cases for a GOTPLT relocation. 1) The
       relocation is against the jump slot entry of a plt that
       will get emitted to the output file. 2) The relocation
       is against the jump slot of a plt entry that has been
       removed. elf_s390_adjust_gotplt has created a GOT entry
       as replacement. 3) The relocation is against a local symbol.
       Cases 2) and 3) are the same as the GOT relocation code
       so we just have to test for case 1 and fall through for
       the other two.  */
    if (h != NULL && h->plt.offset != (bfd_vma) -1)
      {
        bfd_vma plt_index;

        if (s390_is_ifunc_symbol_p (h))
    {
      /* Entry indices of .iplt and .igot.plt match
         1:1. No magic PLT first entry here.  */
      plt_index = h->plt.offset / PLT_ENTRY_SIZE;
      relocation = (plt_index * GOT_ENTRY_SIZE
        + s390_gotplt_offset (info)
        + htab->elf.igotplt->output_offset);
    }
        else
    {
      plt_index = ((h->plt.offset - PLT_FIRST_ENTRY_SIZE)
             / PLT_ENTRY_SIZE);

      relocation = (plt_index * GOT_ENTRY_SIZE
        + s390_gotplt_offset (info));
    }
        if (r_type == R_390_GOTPLTENT)
    relocation += s390_got_pointer (info);
        unresolved_reloc = false;
        break;
      }
    /* Fall through.  */

  case R_390_GOT12:
  case R_390_GOT16:
  case R_390_GOT20:
  case R_390_GOT32:
  case R_390_GOT64:
  case R_390_GOTENT:
    /* Relocation is to the entry for this symbol in the global
       offset table.  */
    if (htab->elf.sgot == NULL)
      abort ();

    if (h != NULL)
      {
        bool dyn;

        off = h->got.offset;
        dyn = htab->elf.dynamic_sections_created;

        if (s390_is_ifunc_symbol_p (h))
    {
      BFD_ASSERT (h->plt.offset != (bfd_vma) -1);
      if (off == (bfd_vma)-1)
        {
          /* No explicit GOT usage so redirect to the
       got.iplt slot.  */
          relocation = (s390_gotplt_offset (info)
            + htab->elf.igotplt->output_offset
            + (h->plt.offset / PLT_ENTRY_SIZE
               * GOT_ENTRY_SIZE));

          /* For @GOTENT the relocation is against the offset between
       the instruction and the symbols entry in the GOT and not
       between the start of the GOT and the symbols entry. We
       add the vma of the GOT to get the correct value.  */
          if (r_type == R_390_GOTENT || r_type == R_390_GOTPLTENT)
      relocation += s390_got_pointer (info);

          break;
        }
      else
        {
          /* Explicit GOT slots must contain the address
       of the PLT slot. This will be handled in
       finish_dynamic_symbol.  */
        }
    }
        else if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
                bfd_link_pic (info),
                h)
           || SYMBOL_REFERENCES_LOCAL (info, h)
           || resolved_to_zero)
    {
      /* This is actually a static link, or it is a
         -Bsymbolic link and the symbol is defined
         locally, or the symbol was forced to be local
         because of a version file.  We must initialize
         this entry in the global offset table.  Since the
         offset must always be a multiple of 2, we use the
         least significant bit to record whether we have
         initialized it already.

         When doing a dynamic link, we create a .rel.got
         relocation entry to initialize the value.  This
         is done in the finish_dynamic_symbol routine.  */
      if ((off & 1) != 0)
        off &= ~1;
      else
        {
          bfd_put_64 (output_bfd, relocation,
          htab->elf.sgot->contents + off);
          h->got.offset |= 1;
        }

      /* When turning a GOT slot dereference into a direct
         reference using larl we have to make sure that
         the symbol is 1. properly aligned and 2. it is no
         ABS symbol or will become one.  */
      if (relax
          && h->def_regular
          && SYMBOL_REFERENCES_LOCAL (info, h)
          /* lgrl rx,sym@GOTENT -> larl rx, sym */
          && ((r_type == R_390_GOTENT
         && (bfd_get_16 (input_bfd,
             contents + rel->r_offset - 2)
             & 0xff0f) == 0xc408)
        /* lg rx, sym@GOT(r12) -> larl rx, sym */
        || (r_type == R_390_GOT20
            && (bfd_get_32 (input_bfd,
                contents + rel->r_offset - 2)
          & 0xff00f000) == 0xe300c000
            && bfd_get_8 (input_bfd,
              contents + rel->r_offset + 3) == 0x04))
          && !bfd_is_abs_symbol (&h->root)
          && h != htab->elf.hdynamic
          && h != htab->elf.hgot
          && h != htab->elf.hplt
          && !((h->root.u.def.value
          + sec->output_section->vma
          + sec->output_offset) & 1))
        {
          unsigned short new_insn =
      (0xc000 | (bfd_get_8 (input_bfd,
                contents + rel->r_offset - 1) & 0xf0));
          bfd_put_16 (output_bfd, new_insn,
          contents + rel->r_offset - 2);
          r_type = R_390_PC32DBL;
          rel->r_info = ELF64_R_INFO (r_symndx, r_type);
          rel->r_addend = 2;
          howto = elf_howto_table + r_type;
          relocation = h->root.u.def.value
      + h->root.u.def.section->output_section->vma
      + h->root.u.def.section->output_offset;
          goto do_relocation;
        }
    }
        else
    unresolved_reloc = false;
      }
    else
      {
        if (local_got_offsets == NULL)
    abort ();

        off = local_got_offsets[r_symndx];

        /* The offset must always be a multiple of 8.  We use
     the least significant bit to record whether we have
     already generated the necessary reloc.  */
        if ((off & 1) != 0)
    off &= ~1;
        else
    {
      bfd_put_64 (output_bfd, relocation,
            htab->elf.sgot->contents + off);

      if (bfd_link_pic (info))
        {
          asection *s;
          Elf_Internal_Rela outrel;
          bfd_byte *loc;

          s = htab->elf.srelgot;
          if (s == NULL)
      abort ();

          outrel.r_offset = (htab->elf.sgot->output_section->vma
           + htab->elf.sgot->output_offset
           + off);
          outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
          outrel.r_addend = relocation;
          loc = s->contents;
          loc += s->reloc_count++ * sizeof (Elf64_External_Rela);
          bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
        }

      local_got_offsets[r_symndx] |= 1;
    }
      }

    if (off >= (bfd_vma) -2)
      abort ();

    relocation = s390_got_offset (info) + off;

    /* For @GOTENT the relocation is against the offset between
       the instruction and the symbols entry in the GOT and not
       between the start of the GOT and the symbols entry. We
       add the vma of the GOT to get the correct value.  */
    if (   r_type == R_390_GOTENT
        || r_type == R_390_GOTPLTENT)
      relocation += s390_got_pointer (info);

    break;

  case R_390_GOTOFF16:
  case R_390_GOTOFF32:
  case R_390_GOTOFF64:
    /* Relocation is relative to the start of the global offset
       table.  */

    if (h != NULL
        && s390_is_ifunc_symbol_p (h)
        && h->def_regular
        && !bfd_link_executable (info))
      {
        relocation = (htab->elf.iplt->output_section->vma
          + htab->elf.iplt->output_offset
          + h->plt.offset
          - s390_got_pointer (info));
        goto do_relocation;
      }

    relocation -= s390_got_pointer (info);
    break;

  case R_390_GOTPC:
  case R_390_GOTPCDBL:
    /* Use global offset table as symbol value.  */
    relocation = s390_got_pointer (info);
    unresolved_reloc = false;
    break;

  case R_390_PLT12DBL:
  case R_390_PLT16DBL:
  case R_390_PLT24DBL:
  case R_390_PLT32:
  case R_390_PLT32DBL:
  case R_390_PLT64:
    /* Relocation is to the entry for this symbol in the
       procedure linkage table.  */

    /* Resolve a PLT32 reloc against a local symbol directly,
       without using the procedure linkage table.  */
    if (h == NULL)
      break;

    if (h->plt.offset == (bfd_vma) -1
        || (htab->elf.splt == NULL && !s390_is_ifunc_symbol_p (h)))
      {
        /* We didn't make a PLT entry for this symbol.  This
     happens when statically linking PIC code, or when
     using -Bsymbolic.  */

        /* Replace relative long addressing instructions of weak
     symbols, which will definitely resolve to zero, with
     either a load address of 0 or a trapping insn.
     This prevents the PLT32DBL relocation from overflowing in
     case the binary will be loaded at 4GB or more.  */
        if (relax
      && h->root.type == bfd_link_hash_undefweak
      && !h->root.linker_def
      && (bfd_link_executable (info)
          || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
      && r_type == R_390_PLT32DBL
      && rel->r_offset >= 2)
    {
      void *insn_start = contents + rel->r_offset - 2;
      uint16_t op = bfd_get_16 (input_bfd, insn_start) & 0xff0f;
      uint8_t reg = bfd_get_8 (input_bfd, insn_start + 1) & 0xf0;

      /* NOTE: The order of the if's is important!  */
      /* Replace load address relative long (larl) with load
         address (lay) */
      if (op == 0xc000)
        {
          /* larl rX,<weak sym> -> lay rX,0(0)  */
          bfd_put_16 (output_bfd, 0xe300 | reg, insn_start);
          bfd_put_32 (output_bfd, 0x71, insn_start + 2);
          rel->r_info = ELF64_R_INFO (0, R_390_NONE);
          rel->r_addend = 0;
          continue;
        }
      /* Replace branch relative and save long (brasl) with a trap.  */
      else if (op == 0xc005)
        {
          /* brasl rX,<weak sym> -> jg .+2 (6-byte trap)  */
          bfd_put_16 (output_bfd, 0xc0f4, insn_start);
          bfd_put_32 (output_bfd, 0x1, insn_start + 2);
          rel->r_info = ELF64_R_INFO (0, R_390_NONE);
          rel->r_addend = 0;
          continue;
        }
    }

        break;
      }
    if (s390_is_ifunc_symbol_p (h))
      relocation = (htab->elf.iplt->output_section->vma
        + htab->elf.iplt->output_offset
        + h->plt.offset);
    else
      relocation = (htab->elf.splt->output_section->vma
        + htab->elf.splt->output_offset
        + h->plt.offset);
    unresolved_reloc = false;
    break;

  case R_390_PLTOFF16:
  case R_390_PLTOFF32:
  case R_390_PLTOFF64:
    /* Relocation is to the entry for this symbol in the
       procedure linkage table relative to the start of the GOT.  */

    /* For local symbols or if we didn't make a PLT entry for
       this symbol resolve the symbol directly.  */
    if (h == NULL
        || h->plt.offset == (bfd_vma) -1
        || (htab->elf.splt == NULL && !s390_is_ifunc_symbol_p (h)))
      {
        relocation -= s390_got_pointer (info);
        break;
      }

    if (s390_is_ifunc_symbol_p (h))
      relocation = (htab->elf.iplt->output_section->vma
        + htab->elf.iplt->output_offset
        + h->plt.offset
        - s390_got_pointer (info));
    else
      relocation = (htab->elf.splt->output_section->vma
        + htab->elf.splt->output_offset
        + h->plt.offset
        - s390_got_pointer (info));
    unresolved_reloc = false;
    break;

  case R_390_PC16:
  case R_390_PC12DBL:
  case R_390_PC16DBL:
  case R_390_PC24DBL:
  case R_390_PC32:
  case R_390_PC32DBL:
  case R_390_PC64:
    if (h != NULL
        && bfd_link_pie (info)
        && !h->def_regular)
      {
        _bfd_error_handler (_("%pB: `%s' non-PLT reloc for symbol defined "
            "in shared library and accessed "
            "from executable "
            "(rebuild file with -fPIC ?)"),
          input_bfd, h->root.root.string);
        bfd_set_error (bfd_error_bad_value);
        return false;
      }
    /* The target of these relocs are instruction operands
       residing in read-only sections.  We cannot emit a runtime
       reloc for it.  */
    if (h != NULL
        && s390_is_ifunc_symbol_p (h)
        && h->def_regular
        && bfd_link_pic (info))
      {
        relocation = (htab->elf.iplt->output_section->vma
          + htab->elf.iplt->output_offset
          + h->plt.offset);
        goto do_relocation;
      }

    /* Replace relative long addressing instructions of weak
       symbols, which will definitely resolve to zero, with
       either a load address of 0, a NOP, or a trapping insn.
       This prevents the PC32DBL relocation from overflowing in
       case the binary will be loaded at 4GB or more.  */
    if (relax
        && h != NULL
        && h->root.type == bfd_link_hash_undefweak
        && !h->root.linker_def
        && (bfd_link_executable (info)
      || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
        && r_type == R_390_PC32DBL
        && rel->r_offset >= 2)
      {
        void *insn_start = contents + rel->r_offset - 2;
        uint16_t op = bfd_get_16 (input_bfd, insn_start) & 0xff0f;
        uint8_t reg = bfd_get_8 (input_bfd, insn_start + 1) & 0xf0;

        /* NOTE: The order of the if's is important!  */
        /* Replace load address relative long (larl) with load
     address (lay) */
        if (op == 0xc000)
    {
      /* larl rX,<weak sym> -> lay rX,0(0)  */
      bfd_put_16 (output_bfd, 0xe300 | reg, insn_start);
      bfd_put_32 (output_bfd, 0x71, insn_start + 2);
      rel->r_info = ELF64_R_INFO (0, R_390_NONE);
      rel->r_addend = 0;
      continue;
    }
        /* Replace prefetch data relative long (pfdrl) with a NOP  */
        else if (op == 0xc602)
    {
      /* Emit a 6-byte NOP: jgnop .  */
      bfd_put_16 (output_bfd, 0xc004, insn_start);
      bfd_put_32 (output_bfd, 0x0, insn_start + 2);
      rel->r_info = ELF64_R_INFO (0, R_390_NONE);
      rel->r_addend = 0;
      continue;
    }
        /* Replace the following instructions with a trap:
     - branch relative and save long (brasl)
     - load (logical) relative long (lrl, lgrl, lgfrl, llgfrl)
     - load (logical) halfword relative long (lhrl, lghrl, llhrl, llghrl)
     - store relative long (strl, stgrl)
     - store halfword relative long (sthrl)
     - execute relative long (exrl)
     - compare (logical) relative long (crl, clrl, cgrl, clgrl, cgfrl, clgfrl)
     - compare (logical) halfword relative long (chrl, cghrl, clhrl, clghrl)  */
        else if (op == 0xc005 || (op & 0xff00) == 0xc400
           || (op & 0xff00) == 0xc600)
    {
      /* Emit a 6-byte trap: jg .+2  */
      bfd_put_16 (output_bfd, 0xc0f4, insn_start);
      bfd_put_32 (output_bfd, 0x1, insn_start + 2);
      rel->r_info = ELF64_R_INFO (0, R_390_NONE);
      rel->r_addend = 0;
      continue;
    }
      }
    /* Fall through.  */

  case R_390_8:
  case R_390_16:
  case R_390_32:
  case R_390_64:

    if ((input_section->flags & SEC_ALLOC) == 0)
      break;

    if (h != NULL
        && s390_is_ifunc_symbol_p (h)
        && h->def_regular)
      {
        if (!bfd_link_pic (info))
    {
      /* For a non-shared object the symbol will not
         change.  Hence we can write the address of the
         target IPLT slot now.  */
      relocation = (htab->elf.iplt->output_section->vma
        + htab->elf.iplt->output_offset
        + h ->plt.offset);
      goto do_relocation;
    }
        else
    {
      /* For shared objects a runtime relocation is needed.  */

      Elf_Internal_Rela outrel;
      asection *sreloc;

      /* Need a dynamic relocation to get the real function
         address.  */
      outrel.r_offset = _bfd_elf_section_offset (output_bfd,
                   info,
                   input_section,
                   rel->r_offset);
      if (outrel.r_offset == (bfd_vma) -1
          || outrel.r_offset == (bfd_vma) -2)
        abort ();

      outrel.r_offset += (input_section->output_section->vma
              + input_section->output_offset);

      if (h->dynindx == -1
          || h->forced_local
          || bfd_link_executable (info))
        {
          /* This symbol is resolved locally.  */
          outrel.r_info = ELF64_R_INFO (0, R_390_IRELATIVE);
          outrel.r_addend = (h->root.u.def.value
           + h->root.u.def.section->output_section->vma
           + h->root.u.def.section->output_offset);
        }
      else
        {
          outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
          outrel.r_addend = 0;
        }

      sreloc = htab->elf.irelifunc;
      _bfd_elf_append_rela (output_bfd, sreloc, &outrel);

      /* If this reloc is against an external symbol, we
         do not want to fiddle with the addend.  Otherwise,
         we need to include the symbol value so that it
         becomes an addend for the dynamic reloc.  For an
         internal symbol, we have updated addend.  */
      continue;
    }
      }

    if ((bfd_link_pic (info)
         && (h == NULL
       || (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
           && !resolved_to_zero)
       || h->root.type != bfd_link_hash_undefweak)
         && ((r_type != R_390_PC16
        && r_type != R_390_PC12DBL
        && r_type != R_390_PC16DBL
        && r_type != R_390_PC24DBL
        && r_type != R_390_PC32
        && r_type != R_390_PC32DBL
        && r_type != R_390_PC64)
       || !SYMBOL_CALLS_LOCAL (info, h)))
        || (ELIMINATE_COPY_RELOCS
      && !bfd_link_pic (info)
      && h != NULL
      && h->dynindx != -1
      && !h->non_got_ref
      && ((h->def_dynamic
           && !h->def_regular)
          || h->root.type == bfd_link_hash_undefweak
          || h->root.type == bfd_link_hash_undefined)))
      {
        Elf_Internal_Rela outrel;
        bool skip, relocate;
        asection *sreloc;
        bfd_byte *loc;

        /* When generating a shared object, these relocations
     are copied into the output file to be resolved at run
     time.  */
        skip = false;
        relocate = false;

        outrel.r_offset =
    _bfd_elf_section_offset (output_bfd, info, input_section,
           rel->r_offset);
        if (outrel.r_offset == (bfd_vma) -1)
    skip = true;
        else if (outrel.r_offset == (bfd_vma) -2)
    skip = true, relocate = true;

        outrel.r_offset += (input_section->output_section->vma
          + input_section->output_offset);

        if (skip)
    memset (&outrel, 0, sizeof outrel);
        else if (h != NULL
           && h->dynindx != -1
           && (r_type == R_390_PC16
         || r_type == R_390_PC12DBL
         || r_type == R_390_PC16DBL
         || r_type == R_390_PC24DBL
         || r_type == R_390_PC32
         || r_type == R_390_PC32DBL
         || r_type == R_390_PC64
         || !(bfd_link_executable (info) || SYMBOLIC_BIND (info, h))
         || !h->def_regular))
    {
      outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
      outrel.r_addend = rel->r_addend;
    }
        else
    {
      /* This symbol is local, or marked to become local.  */
      outrel.r_addend = relocation + rel->r_addend;
      if (r_type == R_390_64)
        {
          relocate = true;
          outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
        }
      else
        {
          long sindx;

          if (bfd_is_abs_section (sec))
      sindx = 0;
          else if (sec == NULL || sec->owner == NULL)
      {
        bfd_set_error(bfd_error_bad_value);
        return false;
      }
          else
      {
        asection *osec;

        osec = sec->output_section;
        sindx = elf_section_data (osec)->dynindx;

        if (sindx == 0)
          {
            osec = htab->elf.text_index_section;
            sindx = elf_section_data (osec)->dynindx;
          }
        BFD_ASSERT (sindx != 0);

        /* We are turning this relocation into one
           against a section symbol, so subtract out
           the output section's address but not the
           offset of the input section in the output
           section.  */
        outrel.r_addend -= osec->vma;
      }
          outrel.r_info = ELF64_R_INFO (sindx, r_type);
        }
    }

        sreloc = elf_section_data (input_section)->sreloc;
        if (sreloc == NULL)
    abort ();

        loc = sreloc->contents;
        loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
        bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);

        /* If this reloc is against an external symbol, we do
     not want to fiddle with the addend.  Otherwise, we
     need to include the symbol value so that it becomes
     an addend for the dynamic reloc.  */
        if (! relocate)
    continue;
      }

    break;

    /* Relocations for tls literal pool entries.  */
  case R_390_TLS_IE64:
    if (bfd_link_dll (info))
      {
        Elf_Internal_Rela outrel;
        asection *sreloc;
        bfd_byte *loc;

        outrel.r_offset = rel->r_offset
        + input_section->output_section->vma
        + input_section->output_offset;
        outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
        sreloc = elf_section_data (input_section)->sreloc;
        if (sreloc == NULL)
    abort ();
        loc = sreloc->contents;
        loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
        bfd_elf64_swap_reloc_out (output_bfd, &outrel, loc);
      }
    /* Fall through.  */

  case R_390_TLS_GD64:
  case R_390_TLS_GOTIE64:
    r_type = elf_s390_tls_transition (info, r_type, h == NULL);
    tls_type = GOT_UNKNOWN;
    if (h == NULL && local_got_offsets)
      tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
    else if (h != NULL)
      {
        tls_type = elf_s390_hash_entry(h)->tls_type;
        if (!bfd_link_dll (info) && h->dynindx == -1 && tls_type >= GOT_TLS_IE)
    r_type = R_390_TLS_LE64;
      }
    if (r_type == R_390_TLS_GD64 && tls_type >= GOT_TLS_IE)
      r_type = R_390_TLS_IE64;

    if (r_type == R_390_TLS_LE64)
      {
        /* This relocation gets optimized away by the local exec
     access optimization.  */
        BFD_ASSERT (! unresolved_reloc);
        bfd_put_64 (output_bfd, -tpoff (info, relocation) + rel->r_addend,
        contents + rel->r_offset);
        continue;
      }

    if (htab->elf.sgot == NULL)
      abort ();

    if (h != NULL)
      off = h->got.offset;
    else
      {
        if (local_got_offsets == NULL)
    abort ();

        off = local_got_offsets[r_symndx];
      }

  emit_tls_relocs:

    if ((off & 1) != 0)
      off &= ~1;
    else
      {
        Elf_Internal_Rela outrel;
        bfd_byte *loc;
        int dr_type, indx;

        if (htab->elf.srelgot == NULL)
    abort ();

        outrel.r_offset = (htab->elf.sgot->output_section->vma
         + htab->elf.sgot->output_offset + off);

        indx = h && h->dynindx != -1 ? h->dynindx : 0;
        if (r_type == R_390_TLS_GD64)
    dr_type = R_390_TLS_DTPMOD;
        else
    dr_type = R_390_TLS_TPOFF;
        if (dr_type == R_390_TLS_TPOFF && indx == 0)
    outrel.r_addend = relocation - dtpoff_base (info);
        else
    outrel.r_addend = 0;
        outrel.r_info = ELF64_R_INFO (indx, dr_type);
        loc = htab->elf.srelgot->contents;
        loc += htab->elf.srelgot->reloc_count++
    * sizeof (Elf64_External_Rela);
        bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);

        if (r_type == R_390_TLS_GD64)
    {
      if (indx == 0)
        {
          BFD_ASSERT (! unresolved_reloc);
          bfd_put_64 (output_bfd,
          relocation - dtpoff_base (info),
          htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
        }
      else
        {
          outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_DTPOFF);
          outrel.r_offset += GOT_ENTRY_SIZE;
          outrel.r_addend = 0;
          htab->elf.srelgot->reloc_count++;
          loc += sizeof (Elf64_External_Rela);
          bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
        }
    }

        if (h != NULL)
    h->got.offset |= 1;
        else
    local_got_offsets[r_symndx] |= 1;
      }

    if (off >= (bfd_vma) -2)
      abort ();
    if (r_type == ELF64_R_TYPE (rel->r_info))
      {
        relocation = htab->elf.sgot->output_offset + off;
        if (r_type == R_390_TLS_IE64 || r_type == R_390_TLS_IEENT)
    relocation += htab->elf.sgot->output_section->vma;
        unresolved_reloc = false;
      }
    else
      {
        bfd_put_64 (output_bfd, htab->elf.sgot->output_offset + off,
        contents + rel->r_offset);
        continue;
      }
    break;

  case R_390_TLS_GOTIE12:
  case R_390_TLS_GOTIE20:
  case R_390_TLS_IEENT:
    if (h == NULL)
      {
        if (local_got_offsets == NULL)
    abort();
        off = local_got_offsets[r_symndx];
        if (bfd_link_dll (info))
    goto emit_tls_relocs;
      }
    else
      {
        off = h->got.offset;
        tls_type = elf_s390_hash_entry(h)->tls_type;
        if (bfd_link_dll (info) || h->dynindx != -1 || tls_type < GOT_TLS_IE)
    goto emit_tls_relocs;
      }

    if (htab->elf.sgot == NULL)
      abort ();

    BFD_ASSERT (! unresolved_reloc);
    bfd_put_64 (output_bfd, -tpoff (info, relocation),
          htab->elf.sgot->contents + off);
    relocation = htab->elf.sgot->output_offset + off;
    if (r_type == R_390_TLS_IEENT)
      relocation += htab->elf.sgot->output_section->vma;
    unresolved_reloc = false;
    break;

  case R_390_TLS_LDM64:
    if (! bfd_link_dll (info))
      /* The literal pool entry this relocation refers to gets ignored
         by the optimized code of the local exec model. Do nothing
         and the value will turn out zero.  */
      continue;

    if (htab->elf.sgot == NULL)
      abort ();

    off = htab->tls_ldm_got.offset;
    if (off & 1)
      off &= ~1;
    else
      {
        Elf_Internal_Rela outrel;
        bfd_byte *loc;

        if (htab->elf.srelgot == NULL)
    abort ();

        outrel.r_offset = (htab->elf.sgot->output_section->vma
         + htab->elf.sgot->output_offset + off);

        bfd_put_64 (output_bfd, 0,
        htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
        outrel.r_info = ELF64_R_INFO (0, R_390_TLS_DTPMOD);
        outrel.r_addend = 0;
        loc = htab->elf.srelgot->contents;
        loc += htab->elf.srelgot->reloc_count++
    * sizeof (Elf64_External_Rela);
        bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
        htab->tls_ldm_got.offset |= 1;
      }
    relocation = htab->elf.sgot->output_offset + off;
    unresolved_reloc = false;
    break;

  case R_390_TLS_LE64:
    if (bfd_link_dll (info))
      {
        /* Linking a shared library with non-fpic code requires
     a R_390_TLS_TPOFF relocation.  */
        Elf_Internal_Rela outrel;
        asection *sreloc;
        bfd_byte *loc;
        int indx;

        outrel.r_offset = rel->r_offset
        + input_section->output_section->vma
        + input_section->output_offset;
        if (h != NULL && h->dynindx != -1)
    indx = h->dynindx;
        else
    indx = 0;
        outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_TPOFF);
        if (indx == 0)
    outrel.r_addend = relocation - dtpoff_base (info);
        else
    outrel.r_addend = 0;
        sreloc = elf_section_data (input_section)->sreloc;
        if (sreloc == NULL)
    abort ();
        loc = sreloc->contents;
        loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
        bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
      }
    else
      {
        BFD_ASSERT (! unresolved_reloc);
        bfd_put_64 (output_bfd, -tpoff (info, relocation) + rel->r_addend,
        contents + rel->r_offset);
      }
    continue;

  case R_390_TLS_LDO64:
    if (bfd_link_dll (info) || (input_section->flags & SEC_DEBUGGING))
      relocation -= dtpoff_base (info);
    else
      /* When converting LDO to LE, we must negate.  */
      relocation = -tpoff (info, relocation);
    break;

    /* Relocations for tls instructions.  */
  case R_390_TLS_LOAD:
  case R_390_TLS_GDCALL:
  case R_390_TLS_LDCALL:
    tls_type = GOT_UNKNOWN;
    if (h == NULL && local_got_offsets)
      tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
    else if (h != NULL)
      tls_type = elf_s390_hash_entry(h)->tls_type;

    if (tls_type == GOT_TLS_GD)
      continue;

    if (r_type == R_390_TLS_LOAD)
      {
        if (!bfd_link_dll (info) && (h == NULL || h->dynindx == -1))
    {
      /* IE->LE transition. Four valid cases:
         lg %rx,(0,%ry)    -> sllg %rx,%ry,0
         lg %rx,(%ry,0)    -> sllg %rx,%ry,0
         lg %rx,(%ry,%r12) -> sllg %rx,%ry,0
         lg %rx,(%r12,%ry) -> sllg %rx,%ry,0  */
      unsigned int insn0, insn1, ry;

      insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
      insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
      if (insn1 != 0x0004)
        {
          invalid_tls_insn (input_bfd, input_section, rel);
          return false;
        }
      if ((insn0 & 0xff00f000) == 0xe3000000)
        /* lg %rx,0(%ry,0) -> sllg %rx,%ry,0  */
        ry = (insn0 & 0x000f0000);
      else if ((insn0 & 0xff0f0000) == 0xe3000000)
        /* lg %rx,0(0,%ry) -> sllg %rx,%ry,0  */
        ry = (insn0 & 0x0000f000) << 4;
      else if ((insn0 & 0xff00f000) == 0xe300c000)
        /* lg %rx,0(%ry,%r12) -> sllg %rx,%ry,0  */
        ry = (insn0 & 0x000f0000);
      else if ((insn0 & 0xff0f0000) == 0xe30c0000)
        /* lg %rx,0(%r12,%ry) -> sllg %rx,%ry,0  */
        ry = (insn0 & 0x0000f000) << 4;
      else
        {
          invalid_tls_insn (input_bfd, input_section, rel);
          return false;
        }
      insn0 = 0xeb000000 | (insn0 & 0x00f00000) | ry;
      insn1 = 0x000d;
      bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
      bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
    }
      }
    else if (r_type == R_390_TLS_GDCALL)
      {
        unsigned int insn0, insn1;

        insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
        insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
        if ((insn0 & 0xffff0000) != 0xc0e50000)
    {
      invalid_tls_insn (input_bfd, input_section, rel);
      return false;
    }
        if (!bfd_link_dll (info) && (h == NULL || h->dynindx == -1))
    {
      /* GD->LE transition.
         brasl %r14,__tls_get_addr@plt -> brcl 0,. */
      insn0 = 0xc0040000;
      insn1 = 0x0000;
    }
        else
    {
      /* GD->IE transition.
         brasl %r14,__tls_get_addr@plt -> lg %r2,0(%r2,%r12)  */
      insn0 = 0xe322c000;
      insn1 = 0x0004;
    }
        bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
        bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
      }
    else if (r_type == R_390_TLS_LDCALL)
      {
        if (!bfd_link_dll (info))
    {
      unsigned int insn0, insn1;

      insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
      insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
      if ((insn0 & 0xffff0000) != 0xc0e50000)
        {
          invalid_tls_insn (input_bfd, input_section, rel);
          return false;
        }
      /* LD->LE transition.
         brasl %r14,__tls_get_addr@plt -> brcl 0,. */
      insn0 = 0xc0040000;
      insn1 = 0x0000;
      bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
      bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
    }
      }
    continue;

  default:
    break;
  }

      /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
   because such sections are not SEC_ALLOC and thus ld.so will
   not process them.  */
      if (unresolved_reloc
    && !((input_section->flags & SEC_DEBUGGING) != 0
         && h->def_dynamic)
    && _bfd_elf_section_offset (output_bfd, info, input_section,
              rel->r_offset) != (bfd_vma) -1)
  _bfd_error_handler
    /* xgettext:c-format */
    (_("%pB(%pA+%#" PRIx64 "): "
       "unresolvable %s relocation against symbol `%s'"),
     input_bfd,
     input_section,
     (uint64_t) rel->r_offset,
     howto->name,
     h->root.root.string);

    do_relocation:

      /* When applying a 24 bit reloc we need to start one byte
   earlier.  Otherwise the 32 bit get/put bfd operations might
   access a byte after the actual section.  */
      if (r_type == R_390_PC24DBL
    || r_type == R_390_PLT24DBL)
  rel->r_offset--;

      /* Issue an error if the right shift implied by the relocation
   would drop bits from the symbol value.  */
      if (howto->rightshift
    && (relocation & (((bfd_vma)1 << howto->rightshift) - 1)))
  {
    _bfd_error_handler
      /* xgettext:c-format */
      (_("%pB(%pA+%#" PRIx64 "): "
         "relocation %s against misaligned symbol `%s' (%#" PRIx64 ") in %pB"),
       input_bfd,
       input_section,
       (uint64_t) rel->r_offset,
       howto->name,
       h->root.root.string,
       (uint64_t)relocation,
       sec->owner);
    return false;
  }

      if (r_type == R_390_20
    || r_type == R_390_GOT20
    || r_type == R_390_GOTPLT20
    || r_type == R_390_TLS_GOTIE20)
  {
    relocation += rel->r_addend;
    relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
    r = _bfd_final_link_relocate (howto, input_bfd, input_section,
          contents, rel->r_offset,
          relocation, 0);
  }
      else
  r = _bfd_final_link_relocate (howto, input_bfd, input_section,
              contents, rel->r_offset,
              relocation, rel->r_addend);

      if (r != bfd_reloc_ok)
  {
    const char *name;

    if (h != NULL)
      name = h->root.root.string;
    else
      {
        name = bfd_elf_string_from_elf_section (input_bfd,
                  symtab_hdr->sh_link,
                  sym->st_name);
        if (name == NULL)
    return false;
        if (*name == '\0')
    name = bfd_section_name (sec);
      }

    if (r == bfd_reloc_overflow)
      (*info->callbacks->reloc_overflow)
        (info, (h ? &h->root : NULL), name, howto->name,
         (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
    else
      {
        _bfd_error_handler
    /* xgettext:c-format */
    (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"),
     input_bfd, input_section,
     (uint64_t) rel->r_offset, name, (int) r);
        return false;
      }
  }
    }

  return true;
}

/* Generate the PLT slots together with the dynamic relocations needed
   for IFUNC symbols.  */

static void
elf_s390_finish_ifunc_symbol (bfd *output_bfd,
            struct bfd_link_info *info,
            struct elf_link_hash_entry *h,
            struct elf_s390_link_hash_table *htab,
            bfd_vma plt_offset,
            bfd_vma resolver_address)
{
  bfd_vma plt_index;
  bfd_vma got_offset;
  Elf_Internal_Rela rela;
  bfd_byte *loc;
  asection *plt, *gotplt, *relplt;

  if (htab->elf.iplt == NULL
      || htab->elf.igotplt == NULL
      || htab->elf.irelplt == NULL)
    abort ();

  /* Index of the PLT slot within iplt section.  */
  plt_index = plt_offset / PLT_ENTRY_SIZE;
  plt = htab->elf.iplt;
  /* Offset into the igot.plt section.  */
  got_offset = plt_index * GOT_ENTRY_SIZE;
  gotplt = htab->elf.igotplt;
  relplt = htab->elf.irelplt;

  /* Fill in the blueprint of a PLT.  */
  memcpy (plt->contents + plt_offset, elf_s390x_plt_entry,
    PLT_ENTRY_SIZE);

  /* Fixup the relative address to the GOT entry */
  bfd_put_32 (output_bfd,
        (gotplt->output_section->vma +
         gotplt->output_offset + got_offset
         - (plt->output_section->vma +
      plt->output_offset +
      plt_offset))/2,
        plt->contents + plt_offset + 2);
  /* Fixup the relative branch to PLT 0 */
  bfd_put_32 (output_bfd, - (plt->output_offset +
           (PLT_ENTRY_SIZE * plt_index) + 22)/2,
        plt->contents + plt_offset + 24);
  /* Fixup offset into .rela.plt section.  */
  bfd_put_32 (output_bfd, relplt->output_offset +
        plt_index * sizeof (Elf64_External_Rela),
        plt->contents + plt_offset + 28);

  /* Fill in the entry in the global offset table.
     Points to instruction after GOT offset.  */
  bfd_put_64 (output_bfd,
        (plt->output_section->vma
         + plt->output_offset
         + plt_offset
         + 14),
        gotplt->contents + got_offset);

  /* Fill in the entry in the .rela.plt section.  */
  rela.r_offset = (gotplt->output_section->vma
       + gotplt->output_offset
       + got_offset);

  if (!h
      || h->dynindx == -1
      || ((bfd_link_executable (info)
     || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
    && h->def_regular))
    {
      /* The symbol can be locally resolved.  */
      rela.r_info = ELF64_R_INFO (0, R_390_IRELATIVE);
      rela.r_addend = resolver_address;
    }
  else
    {
      rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT);
      rela.r_addend = 0;
    }

  loc = relplt->contents + plt_index * sizeof (Elf64_External_Rela);
  bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
}


/* Finish up dynamic symbol handling.  We set the contents of various
   dynamic sections here.  */

static bool
elf_s390_finish_dynamic_symbol (bfd *output_bfd,
        struct bfd_link_info *info,
        struct elf_link_hash_entry *h,
        Elf_Internal_Sym *sym)
{
  struct elf_s390_link_hash_table *htab;
  struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry*)h;

  htab = elf_s390_hash_table (info);

  if (h->plt.offset != (bfd_vma) -1)
    {
      bfd_vma plt_index;
      bfd_vma gotplt_offset;
      Elf_Internal_Rela rela;
      bfd_byte *loc;

      /* This symbol has an entry in the procedure linkage table.  Set
   it up.  */
      if (s390_is_ifunc_symbol_p (h) && h->def_regular)
  {
    elf_s390_finish_ifunc_symbol (output_bfd, info, h,
      htab, h->plt.offset,
      eh->ifunc_resolver_address +
      eh->ifunc_resolver_section->output_offset +
      eh->ifunc_resolver_section->output_section->vma);

    /* Do not return yet.  Handling of explicit GOT slots of
       IFUNC symbols is below.  */
  }
      else
  {
    if (h->dynindx == -1
        || htab->elf.splt == NULL
        || htab->elf.sgotplt == NULL
        || htab->elf.srelplt == NULL)
      abort ();

    /* Calc. index no.
       Current offset - size first entry / entry size.  */
    plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;

    /* The slots in the .got.plt correspond to the PLT slots in
       the same order.  */
    gotplt_offset = plt_index * GOT_ENTRY_SIZE;

    /* If .got.plt comes first it needs to contain the 3 header
       entries.  */
    if (!s390_gotplt_after_got_p (info))
      gotplt_offset += 3 * GOT_ENTRY_SIZE;

    /* Fill in the blueprint of a PLT.  */
    memcpy (htab->elf.splt->contents + h->plt.offset, elf_s390x_plt_entry,
      PLT_ENTRY_SIZE);

    /* The first instruction in the PLT entry is a LARL loading
       the address of the GOT slot.  We write the 4 byte
       immediate operand of the LARL instruction here.  */
    bfd_put_32 (output_bfd,
          (htab->elf.sgotplt->output_section->vma +
           htab->elf.sgotplt->output_offset + gotplt_offset
           - (htab->elf.splt->output_section->vma +
        htab->elf.splt->output_offset +
        h->plt.offset))/2,
          htab->elf.splt->contents + h->plt.offset + 2);
    /* Fixup the relative branch to PLT 0 */
    bfd_put_32 (output_bfd, - (PLT_FIRST_ENTRY_SIZE +
             (PLT_ENTRY_SIZE * plt_index) + 22)/2,
          htab->elf.splt->contents + h->plt.offset + 24);
    /* Fixup offset into .rela.plt section.  */
    bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela),
          htab->elf.splt->contents + h->plt.offset + 28);

    /* Fill in the entry in the global offset table.
       Points to instruction after GOT offset.  */
    bfd_put_64 (output_bfd,
          (htab->elf.splt->output_section->vma
           + htab->elf.splt->output_offset
           + h->plt.offset
           + 14),
          htab->elf.sgotplt->contents + gotplt_offset);

    /* Fill in the entry in the .rela.plt section.  */
    rela.r_offset = (htab->elf.sgotplt->output_section->vma
         + htab->elf.sgotplt->output_offset
         + gotplt_offset);
    rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT);
    rela.r_addend = 0;
    loc = htab->elf.srelplt->contents + plt_index *
      sizeof (Elf64_External_Rela);
    bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);

    if (!h->def_regular)
      {
        /* Mark the symbol as undefined, rather than as defined in
     the .plt section.  Leave the value if there were any
     relocations where pointer equality matters (this is a clue
     for the dynamic linker, to make function pointer
     comparisons work between an application and shared
     library), otherwise set it to zero.  If a function is only
     called from a binary, there is no need to slow down
     shared libraries because of that.  */
        sym->st_shndx = SHN_UNDEF;
        if (!h->pointer_equality_needed)
    sym->st_value = 0;
      }
  }
    }

  if (h->got.offset != (bfd_vma) -1
      && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
      && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
      && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
    {
      Elf_Internal_Rela rela;
      bfd_byte *loc;

      /* This symbol has an entry in the global offset table.  Set it
   up.  */
      if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
  abort ();

      rela.r_offset = (htab->elf.sgot->output_section->vma
           + htab->elf.sgot->output_offset
           + (h->got.offset &~ (bfd_vma) 1));

      if (h->def_regular && s390_is_ifunc_symbol_p (h))
  {
    if (bfd_link_pic (info))
      {
        /* An explicit GOT slot usage needs GLOB_DAT.  If the
     symbol references local the implicit got.iplt slot
     will be used and the IRELATIVE reloc has been created
     above.  */
        goto do_glob_dat;
      }
    else
      {
        if (!h->pointer_equality_needed)
    abort ();

        /* For non-shared objects explicit GOT slots must be
     filled with the PLT slot address for pointer
     equality reasons.  */
        bfd_put_64 (output_bfd, (htab->elf.iplt->output_section->vma
               + htab->elf.iplt->output_offset
               + h->plt.offset),
        htab->elf.sgot->contents + h->got.offset);
        return true;
      }
  }
      else if (SYMBOL_REFERENCES_LOCAL (info, h))
  {
    if (UNDEFWEAK_NO_DYNAMIC_RELOC (info, h))
      return true;

    /* If this is a static link, or it is a -Bsymbolic link and
       the symbol is defined locally or was forced to be local
       because of a version file, we just want to emit a
       RELATIVE reloc.  The entry in the global offset table
       will already have been initialized in the
       relocate_section function.  */
    if (!(h->def_regular || ELF_COMMON_DEF_P (h)))
      return false;
    BFD_ASSERT((h->got.offset & 1) != 0);
    rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
    rela.r_addend = (h->root.u.def.value
         + h->root.u.def.section->output_section->vma
         + h->root.u.def.section->output_offset);
  }
      else
  {
    BFD_ASSERT((h->got.offset & 1) == 0);
  do_glob_dat:
    bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgot->contents + h->got.offset);
    rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT);
    rela.r_addend = 0;
  }

      loc = htab->elf.srelgot->contents;
      loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
      bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
    }

  if (h->needs_copy)
    {
      Elf_Internal_Rela rela;
      asection *s;
      bfd_byte *loc;

      /* This symbols needs a copy reloc.  Set it up.  */

      if (h->dynindx == -1
    || (h->root.type != bfd_link_hash_defined
        && h->root.type != bfd_link_hash_defweak)
    || htab->elf.srelbss == NULL
    || htab->elf.sreldynrelro == NULL)
  abort ();

      rela.r_offset = (h->root.u.def.value
           + h->root.u.def.section->output_section->vma
           + h->root.u.def.section->output_offset);
      rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY);
      rela.r_addend = 0;
      if (h->root.u.def.section == htab->elf.sdynrelro)
  s = htab->elf.sreldynrelro;
      else
  s = htab->elf.srelbss;
      loc = s->contents + s->reloc_count++ * sizeof (Elf64_External_Rela);
      bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
    }

  /* Mark some specially defined symbols as absolute.  */
  if (h == htab->elf.hdynamic
      || h == htab->elf.hgot
      || h == htab->elf.hplt)
    sym->st_shndx = SHN_ABS;

  return true;
}

/* Used to decide how to sort relocs in an optimal manner for the
   dynamic linker, before writing them out.  */

static enum elf_reloc_type_class
elf_s390_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
         const asection *rel_sec ATTRIBUTE_UNUSED,
         const Elf_Internal_Rela *rela)
{
  bfd *abfd = info->output_bfd;
  elf_backend_data *bed = get_elf_backend_data (abfd);
  struct elf_s390_link_hash_table *htab = elf_s390_hash_table (info);
  unsigned long r_symndx = ELF64_R_SYM (rela->r_info);
  Elf_Internal_Sym sym;

  if (htab->elf.dynsym == NULL
      || !bed->s->swap_symbol_in (abfd,
          (htab->elf.dynsym->contents
           + r_symndx * bed->s->sizeof_sym),
          0, &sym))
    abort ();

  /* Check relocation against STT_GNU_IFUNC symbol.  */
  if (ELF_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
    return reloc_class_ifunc;

  switch ((int) ELF64_R_TYPE (rela->r_info))
    {
    case R_390_RELATIVE:
      return reloc_class_relative;
    case R_390_JMP_SLOT:
      return reloc_class_plt;
    case R_390_COPY:
      return reloc_class_copy;
    default:
      return reloc_class_normal;
    }
}

/* Finish up the dynamic sections.  */

static bool
elf_s390_finish_dynamic_sections (bfd *output_bfd,
          struct bfd_link_info *info,
          bfd_byte *buf)
{
  struct elf_s390_link_hash_table *htab;
  bfd *dynobj;
  asection *sdyn;
  bfd *ibfd;
  unsigned int i;

  htab = elf_s390_hash_table (info);
  if (htab == NULL)
    return false;

  dynobj = htab->elf.dynobj;
  sdyn = bfd_get_linker_section (dynobj, ".dynamic");

  if (htab->elf.dynamic_sections_created)
    {
      Elf64_External_Dyn *dyncon, *dynconend;

      if (sdyn == NULL || htab->elf.sgot == NULL)
  abort ();

      dyncon = (Elf64_External_Dyn *) sdyn->contents;
      dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size);
      for (; dyncon < dynconend; dyncon++)
  {
    Elf_Internal_Dyn dyn;
    asection *s;

    bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);

    switch (dyn.d_tag)
      {
      default:
        continue;

      case DT_PLTGOT:
        /* DT_PLTGOT matches _GLOBAL_OFFSET_TABLE_ */
        dyn.d_un.d_ptr = s390_got_pointer (info);
        break;

      case DT_JMPREL:
        s = htab->elf.srelplt;
        dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
        break;

      case DT_PLTRELSZ:
        dyn.d_un.d_val = htab->elf.srelplt->size;
        if (htab->elf.irelplt)
    dyn.d_un.d_val += htab->elf.irelplt->size;
        break;

      case DT_RELASZ:
        /* The procedure linkage table relocs (DT_JMPREL) should
     not be included in the overall relocs (DT_RELA).
     Therefore, we override the DT_RELASZ entry here to
     make it not include the JMPREL relocs.  Since the
     linker script arranges for .rela.plt to follow all
     other relocation sections, we don't have to worry
     about changing the DT_RELA entry.  */
        dyn.d_un.d_val -= htab->elf.srelplt->size;
        if (htab->elf.irelplt)
    dyn.d_un.d_val -= htab->elf.irelplt->size;
        break;
      }

    bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
  }

      /* Fill in the special first entry in the procedure linkage table.  */
      if (htab->elf.splt && htab->elf.splt->size > 0)
  {
    /* fill in blueprint for plt 0 entry */
    memcpy (htab->elf.splt->contents, elf_s390x_first_plt_entry,
      PLT_FIRST_ENTRY_SIZE);
    /* The second instruction in the first PLT entry is a LARL
       loading the GOT pointer.  Fill in the LARL immediate
       address.  */
    bfd_put_32 (output_bfd,
          (s390_got_pointer (info)
           - htab->elf.splt->output_section->vma
           - htab->elf.splt->output_offset - 6)/2,
          htab->elf.splt->contents + 8);
  }
      if (elf_section_data (htab->elf.splt->output_section) != NULL)
  elf_section_data (htab->elf.splt->output_section)->this_hdr.sh_entsize
    = PLT_ENTRY_SIZE;
    }

  if (htab->elf.hgot && htab->elf.hgot->root.u.def.section)
    {
      /* Fill in the first three entries in the global offset table.  */
      if (htab->elf.hgot->root.u.def.section->size > 0)
  {
    bfd_put_64 (output_bfd,
          (sdyn == NULL ? (bfd_vma) 0
           : sdyn->output_section->vma + sdyn->output_offset),
          htab->elf.hgot->root.u.def.section->contents);
    /* One entry for shared object struct ptr.  */
    bfd_put_64 (output_bfd, (bfd_vma) 0,
          htab->elf.hgot->root.u.def.section->contents + 8);
    /* One entry for _dl_runtime_resolve.  */
    bfd_put_64 (output_bfd, (bfd_vma) 0,
          htab->elf.hgot->root.u.def.section->contents + 16);
  }
      if (htab->elf.sgot != NULL && htab->elf.sgot->size > 0)
  elf_section_data (htab->elf.sgot->output_section)
    ->this_hdr.sh_entsize = 8;
    }

  /* Finish dynamic symbol for local IFUNC symbols.  */
  for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
    {
      struct plt_entry *local_plt;
      Elf_Internal_Sym *isym;
      Elf_Internal_Shdr *symtab_hdr;

      symtab_hdr = &elf_symtab_hdr (ibfd);

      if (!is_s390_elf (ibfd))
  continue;

      local_plt = elf_s390_local_plt (ibfd);
      if (local_plt != NULL)
  for (i = 0; i < symtab_hdr->sh_info; i++)
    {
      if (local_plt[i].plt.offset != (bfd_vma) -1)
        {
    asection *sec = local_plt[i].sec;
    isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache, ibfd, i);
    if (isym == NULL)
      return false;

    if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
      elf_s390_finish_ifunc_symbol (output_bfd, info, NULL, htab,
            local_plt[i].plt.offset,
            isym->st_value
            + sec->output_section->vma
            + sec->output_offset);

        }
    }
    }

  /* Adjust .eh_frame for .plt section.  */
  if (htab->plt_eh_frame != NULL
      && htab->plt_eh_frame->contents != NULL)
    {
      if (htab->elf.splt != NULL
    && htab->elf.splt->size != 0
    && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
    && htab->elf.splt->output_section != NULL
    && htab->plt_eh_frame->output_section != NULL)
  {
    bfd_vma plt_start = htab->elf.splt->output_section->vma;
    bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
           + htab->plt_eh_frame->output_offset
           + PLT_FDE_START_OFFSET;
    /* Note: Linker may have discarded the FDE, so that store may
       be beyond current htab->plt_eh_frame->size.  Can be ignored,
       as htab->plt_eh_frame->contents got allocated with
       sizeof (elf_s390x_eh_frame_plt).  See PR 12570.  */
    bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
           htab->plt_eh_frame->contents
           + PLT_FDE_START_OFFSET);
  }

      if (htab->plt_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME
    && !_bfd_elf_write_linker_section_eh_frame (output_bfd, info,
                  htab->plt_eh_frame, buf))
  return NULL;
    }

  /* Make any adjustment if necessary and merge .sframe section to
     create the final .sframe section for output_bfd.  */
  if (htab->plt_sframe != NULL
      && htab->plt_sframe->contents != NULL)
    {
      if (htab->elf.splt != NULL
    && htab->elf.splt->size != 0
    && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
    && htab->elf.splt->output_section != NULL
    && htab->plt_sframe->output_section != NULL)
  {
    bfd_vma plt_start = htab->elf.splt->output_section->vma;
    bfd_vma sframe_start = htab->plt_sframe->output_section->vma
           + htab->plt_sframe->output_offset
           + PLT_SFRAME_FDE_START_OFFSET;
    bfd_put_signed_64 (dynobj, plt_start - sframe_start,
           htab->plt_sframe->contents
           + PLT_SFRAME_FDE_START_OFFSET);
  }
      if (htab->plt_sframe->sec_info_type == SEC_INFO_TYPE_SFRAME)
  {
    if (! _bfd_elf_merge_section_sframe (output_bfd, info,
                 htab->plt_sframe,
                 htab->plt_sframe->contents))
      return false;
  }
    }

  return true;
}

/* Support for core dump NOTE sections.  */

static bool
elf_s390_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
{
  int offset;
  size_t size;

  switch (note->descsz)
    {
    default:
      return false;

    case 336:     /* sizeof(struct elf_prstatus) on s390x */
      /* pr_cursig */
      elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);

      /* pr_pid */
      elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 32);

      /* pr_reg */
      offset = 112;
      size = 216;
      break;
    }

  /* Make a ".reg/999" section.  */
  return _bfd_elfcore_make_pseudosection (abfd, ".reg",
            size, note->descpos + offset);
}

static bool
elf_s390_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
{
  switch (note->descsz)
    {
    default:
      return false;

    case 136:     /* sizeof(struct elf_prpsinfo) on s390x */
      elf_tdata (abfd)->core->pid
  = bfd_get_32 (abfd, note->descdata + 24);
      elf_tdata (abfd)->core->program
  = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
      elf_tdata (abfd)->core->command
  = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
    }

  /* Note that for some reason, a spurious space is tacked
     onto the end of the args in some (at least one anyway)
     implementations, so strip it off if it exists.  */

  {
    char *command = elf_tdata (abfd)->core->command;
    int n = strlen (command);

    if (0 < n && command[n - 1] == ' ')
      command[n - 1] = '\0';
  }

  return true;
}

static char *
elf_s390_write_core_note (bfd *abfd, char *buf, int *bufsiz,
        int note_type, ...)
{
  va_list ap;

  switch (note_type)
    {
    default:
      return NULL;

    case NT_PRPSINFO:
      {
  char data[136] ATTRIBUTE_NONSTRING = { 0 };
  const char *fname, *psargs;

  va_start (ap, note_type);
  fname = va_arg (ap, const char *);
  psargs = va_arg (ap, const char *);
  va_end (ap);

  strncpy (data + 40, fname, 16);
#if GCC_VERSION == 8000 || GCC_VERSION == 8001
  DIAGNOSTIC_PUSH;
  /* GCC 8.0 and 8.1 warn about 80 equals destination size with
     -Wstringop-truncation:
     https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85643
   */
  DIAGNOSTIC_IGNORE_STRINGOP_TRUNCATION;
#endif
  strncpy (data + 56, psargs, 80);
#if GCC_VERSION == 8000 || GCC_VERSION == 8001
  DIAGNOSTIC_POP;
#endif
  return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
           &data, sizeof (data));
      }

    case NT_PRSTATUS:
      {
  char data[336] = { 0 };
  long pid;
  int cursig;
  const void *gregs;

  va_start (ap, note_type);
  pid = va_arg (ap, long);
  cursig = va_arg (ap, int);
  gregs = va_arg (ap, const void *);
  va_end (ap);

  bfd_put_16 (abfd, cursig, data + 12);
  bfd_put_32 (abfd, pid, data + 32);
  memcpy (data + 112, gregs, 216);
  return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
           &data, sizeof (data));
      }
    }
  /* NOTREACHED */
}

/* Return address for Ith PLT stub in section PLT, for relocation REL
   or (bfd_vma) -1 if it should not be included.  */

static bfd_vma
elf_s390_plt_sym_val (bfd_vma i, const asection *plt,
          const arelent *rel ATTRIBUTE_UNUSED)
{
  return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE;
}

/* Merge backend specific data from an object file to the output
   object file when linking.  */

static bool
elf64_s390_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
{
  if (!is_s390_elf (ibfd))
    return true;

  return elf_s390_merge_obj_attributes (ibfd, info);
}

/* We may add a PT_S390_PGSTE program header.  */

static int
elf_s390_additional_program_headers (bfd *abfd ATTRIBUTE_UNUSED,
             struct bfd_link_info *info)
{
  struct elf_s390_link_hash_table *htab;

  if (info)
    {
      htab = elf_s390_hash_table (info);
      if (htab)
  return htab->params->pgste;
    }
  return 0;
}


/* Add the PT_S390_PGSTE program header.  */

static bool
elf_s390_modify_segment_map (bfd *abfd, struct bfd_link_info *info)
{
  struct elf_s390_link_hash_table *htab;
  struct elf_segment_map *m, *pm = NULL;

  if (!abfd || !info)
    return true;

  htab = elf_s390_hash_table (info);
  if (!htab || !htab->params->pgste)
    return true;

  /* If there is already a PT_S390_PGSTE header, avoid adding
     another.  */
  m = elf_seg_map (abfd);
  while (m && m->p_type != PT_S390_PGSTE)
    {
      pm = m;
      m = m->next;
    }

  if (m)
    return true;

  m = (struct elf_segment_map *)
    bfd_zalloc (abfd, sizeof (struct elf_segment_map));
  if (m == NULL)
    return false;
  m->p_type = PT_S390_PGSTE;
  m->count = 0;
  m->next = NULL;
  if (pm)
    pm->next = m;

  return true;
}

bool
bfd_elf_s390_set_options (struct bfd_link_info *info,
        struct s390_elf_params *params)
{
  struct elf_s390_link_hash_table *htab;

  if (info)
    {
      htab = elf_s390_hash_table (info);
      if (htab)
  htab->params = params;
    }

  return true;
}

/* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
   .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
   hash table.  */

static bool
elf_s390_create_dynamic_sections (bfd *dynobj,
                                  struct bfd_link_info *info)
{
  struct elf_s390_link_hash_table *htab;

  if (!_bfd_elf_create_dynamic_sections (dynobj, info))
    return false;

  htab = elf_s390_hash_table (info);
  if (htab == NULL)
    return false;

  htab->sframe_plt = &elf_s390x_sframe_plt;

  if (htab->elf.splt != NULL)
    {
      /* Create .eh_frame section for .plt section.  */
      if (!info->no_ld_generated_unwind_info)
        {
          flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
                            | SEC_HAS_CONTENTS | SEC_IN_MEMORY
                            | SEC_LINKER_CREATED);

          if (htab->plt_eh_frame == NULL)
            {
              htab->plt_eh_frame
                = bfd_make_section_anyway_with_flags (dynobj,
                                                      ".eh_frame",
                                                      flags);
              if (htab->plt_eh_frame == NULL
                  || !bfd_set_section_alignment (htab->plt_eh_frame, 3))
                return false;
            }
        }

      /* Create .sframe section for .plt section.
   Do not make SFrame sections for dynobj unconditionally.  If there
   are no SFrame sections for any input files, skip creating the linker
   created SFrame sections too.  Since SFrame sections are marked KEEP,
   prohibiting these linker-created SFrame sections when unnecessary,
   helps avoid creating of empty SFrame sections in the output.  */
      bool gen_plt_sframe_p = (_bfd_elf_sframe_present_input_bfds (info)
             && !info->discard_sframe);
      if (gen_plt_sframe_p)
  {
    flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
          | SEC_HAS_CONTENTS | SEC_IN_MEMORY
          | SEC_LINKER_CREATED);

    htab->plt_sframe = bfd_make_section_anyway_with_flags (dynobj,
                 ".sframe",
                 flags);
    if (htab->plt_sframe == NULL)
      return false;

    elf_section_type (htab->plt_sframe) = SHT_GNU_SFRAME;
  }
    }

  return true;
}

/* Return TRUE if symbol should be hashed in the `.gnu.hash' section.  */

static bool
elf_s390_hash_symbol (struct elf_link_hash_entry *h)
{
  if (h->plt.offset != (bfd_vma) -1
      && !h->def_regular
      && !h->pointer_equality_needed)
    return false;

  return _bfd_elf_hash_symbol (h);
}

/* Why was the hash table entry size definition changed from
   ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and
   this is the only reason for the s390_elf64_size_info structure.  */

static const struct elf_size_info s390_elf64_size_info =
{
  sizeof (Elf64_External_Ehdr),
  sizeof (Elf64_External_Phdr),
  sizeof (Elf64_External_Shdr),
  sizeof (Elf64_External_Rel),
  sizeof (Elf64_External_Rela),
  sizeof (Elf64_External_Sym),
  sizeof (Elf64_External_Dyn),
  sizeof (Elf_External_Note),
  8,    /* hash-table entry size.  */
  1,    /* internal relocations per external relocations.  */
  64,   /* arch_size.  */
  3,    /* log_file_align.  */
  ELFCLASS64, EV_CURRENT,
  bfd_elf64_write_out_phdrs,
  bfd_elf64_write_shdrs_and_ehdr,
  bfd_elf64_checksum_contents,
  bfd_elf64_write_relocs,
  bfd_elf64_swap_symbol_in,
  bfd_elf64_swap_symbol_out,
  bfd_elf64_slurp_reloc_table,
  bfd_elf64_slurp_symbol_table,
  bfd_elf64_swap_dyn_in,
  bfd_elf64_swap_dyn_out,
  bfd_elf64_swap_reloc_in,
  bfd_elf64_swap_reloc_out,
  bfd_elf64_swap_reloca_in,
  bfd_elf64_swap_reloca_out
};

#define TARGET_BIG_SYM  s390_elf64_vec
#define TARGET_BIG_NAME "elf64-s390"
#define ELF_ARCH  bfd_arch_s390
#define ELF_TARGET_ID S390_ELF_DATA
#define ELF_MACHINE_CODE EM_S390
#define ELF_MACHINE_ALT1 EM_S390_OLD
#define ELF_MAXPAGESIZE 0x1000

#define elf_backend_size_info   s390_elf64_size_info

#define elf_backend_can_gc_sections 1
#define elf_backend_can_refcount  1
#define elf_backend_want_got_plt  1
#define elf_backend_plt_readonly  1
#define elf_backend_want_plt_sym  0
#define elf_backend_got_header_size 24
#define elf_backend_want_dynrelro 1
#define elf_backend_rela_normal   1

#define elf_info_to_howto   elf_s390_info_to_howto

#define bfd_elf64_bfd_is_local_label_name     elf_s390_is_local_label_name
#define bfd_elf64_bfd_link_hash_table_create  elf_s390_link_hash_table_create
#define bfd_elf64_bfd_reloc_type_lookup       elf_s390_reloc_type_lookup
#define bfd_elf64_bfd_reloc_name_lookup       elf_s390_reloc_name_lookup
#define bfd_elf64_bfd_merge_private_bfd_data  elf64_s390_merge_private_bfd_data

#define elf_backend_adjust_dynamic_symbol     elf_s390_adjust_dynamic_symbol
#define elf_backend_check_relocs        elf_s390_check_relocs
#define elf_backend_copy_indirect_symbol      elf_s390_copy_indirect_symbol
#define elf_backend_create_dynamic_sections   elf_s390_create_dynamic_sections
#define elf_backend_finish_dynamic_sections   elf_s390_finish_dynamic_sections
#define elf_backend_finish_dynamic_symbol     elf_s390_finish_dynamic_symbol
#define elf_backend_gc_mark_hook        elf_s390_gc_mark_hook
#define elf_backend_reloc_type_class        elf_s390_reloc_type_class
#define elf_backend_relocate_section        elf_s390_relocate_section
#define elf_backend_late_size_sections        elf_s390_late_size_sections
#define elf_backend_init_index_section        _bfd_elf_init_1_index_section
#define elf_backend_grok_prstatus       elf_s390_grok_prstatus
#define elf_backend_grok_psinfo         elf_s390_grok_psinfo
#define elf_backend_write_core_note       elf_s390_write_core_note
#define elf_backend_plt_sym_val         elf_s390_plt_sym_val
#define elf_backend_sort_relocs_p       elf_s390_elf_sort_relocs_p
#define elf_backend_additional_program_headers elf_s390_additional_program_headers
#define elf_backend_modify_segment_map        elf_s390_modify_segment_map
#define elf_backend_hash_symbol         elf_s390_hash_symbol

#define bfd_elf64_mkobject    elf_s390_mkobject
#define elf_backend_object_p    elf_s390_object_p

#include "elf64-target.h"

Coverage Report

Created: 2026-04-04 08:16