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/* SPARC-specific support for 64-bit ELF

   Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,

   2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011

   Free Software Foundation, Inc.

   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 "libbfd.h"

#include "elf-bfd.h"

#include "elf/sparc.h"

#include "opcode/sparc.h"

#include "elfxx-sparc.h"

/* In case we're on a 32-bit machine, construct a 64-bit "-1" value.  */

#define MINUS_ONE (~ (bfd_vma) 0)

/* Due to the way how we handle R_SPARC_OLO10, each entry in a SHT_RELA

   section can represent up to two relocs, we must tell the user to allocate

   more space.  */

static long

elf64_sparc_get_reloc_upper_bound (bfd *abfd ATTRIBUTE_UNUSED, asection *sec)

{

  return (sec->reloc_count * 2 + 1) * sizeof (arelent *);

}

static long

elf64_sparc_get_dynamic_reloc_upper_bound (bfd *abfd)

{

  return _bfd_elf_get_dynamic_reloc_upper_bound (abfd) * 2;

}

/* Read  relocations for ASECT from REL_HDR.  There are RELOC_COUNT of

   them.  We cannot use generic elf routines for this,  because R_SPARC_OLO10

   has secondary addend in ELF64_R_TYPE_DATA.  We handle it as two relocations

   for the same location,  R_SPARC_LO10 and R_SPARC_13.  */

static bfd_boolean

elf64_sparc_slurp_one_reloc_table (bfd *abfd, asection *asect,

                                   Elf_Internal_Shdr *rel_hdr,

                                   asymbol **symbols, bfd_boolean dynamic)

{

  PTR allocated = NULL;

  bfd_byte *native_relocs;

  arelent *relent;

  unsigned int i;

  int entsize;

  bfd_size_type count;

  arelent *relents;

  allocated = (PTR) bfd_malloc (rel_hdr->sh_size);

  if (allocated == NULL)

    goto error_return;

  if (bfd_seek (abfd, rel_hdr->sh_offset, SEEK_SET) != 0

      || bfd_bread (allocated, rel_hdr->sh_size, abfd) != rel_hdr->sh_size)

    goto error_return;

  native_relocs = (bfd_byte *) allocated;

  relents = asect->relocation + canon_reloc_count (asect);

  entsize = rel_hdr->sh_entsize;

  BFD_ASSERT (entsize == sizeof (Elf64_External_Rela));

  count = rel_hdr->sh_size / entsize;

  for (i = 0, relent = relents; i < count;

       i++, relent++, native_relocs += entsize)

    {

      Elf_Internal_Rela rela;

      unsigned int r_type;

      bfd_elf64_swap_reloca_in (abfd, native_relocs, &rela);

      /* The address of an ELF reloc is section relative for an object

         file, and absolute for an executable file or shared library.

         The address of a normal BFD reloc is always section relative,

         and the address of a dynamic reloc is absolute..  */

      if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0 || dynamic)

        relent->address = rela.r_offset;

      else

        relent->address = rela.r_offset - asect->vma;

      if (ELF64_R_SYM (rela.r_info) == STN_UNDEF)

        relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;

      else

        {

          asymbol **ps, *s;

          ps = symbols + ELF64_R_SYM (rela.r_info) - 1;

          s = *ps;

          /* Canonicalize ELF section symbols.  FIXME: Why?  */

          if ((s->flags & BSF_SECTION_SYM) == 0)

            relent->sym_ptr_ptr = ps;

          else

            relent->sym_ptr_ptr = s->section->symbol_ptr_ptr;

        }

      relent->addend = rela.r_addend;

      r_type = ELF64_R_TYPE_ID (rela.r_info);

      if (r_type == R_SPARC_OLO10)

        {

          relent->howto = _bfd_sparc_elf_info_to_howto_ptr (R_SPARC_LO10);

          relent[1].address = relent->address;

          relent++;

          relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;

          relent->addend = ELF64_R_TYPE_DATA (rela.r_info);

          relent->howto = _bfd_sparc_elf_info_to_howto_ptr (R_SPARC_13);

        }

      else

        relent->howto = _bfd_sparc_elf_info_to_howto_ptr (r_type);

    }

  canon_reloc_count (asect) += relent - relents;

  if (allocated != NULL)

    free (allocated);

  return TRUE;

 error_return:

  if (allocated != NULL)

    free (allocated);

  return FALSE;

}

/* Read in and swap the external relocs.  */

static bfd_boolean

elf64_sparc_slurp_reloc_table (bfd *abfd, asection *asect,

                               asymbol **symbols, bfd_boolean dynamic)

{

  struct bfd_elf_section_data * const d = elf_section_data (asect);

  Elf_Internal_Shdr *rel_hdr;

  Elf_Internal_Shdr *rel_hdr2;

  bfd_size_type amt;

  if (asect->relocation != NULL)

    return TRUE;

  if (! dynamic)

    {

      if ((asect->flags & SEC_RELOC) == 0

          || asect->reloc_count == 0)

        return TRUE;

      rel_hdr = d->rel.hdr;

      rel_hdr2 = d->rela.hdr;

      BFD_ASSERT ((rel_hdr && asect->rel_filepos == rel_hdr->sh_offset)

                  || (rel_hdr2 && asect->rel_filepos == rel_hdr2->sh_offset));

    }

  else

    {

      /* Note that ASECT->RELOC_COUNT tends not to be accurate in this

         case because relocations against this section may use the

         dynamic symbol table, and in that case bfd_section_from_shdr

         in elf.c does not update the RELOC_COUNT.  */

      if (asect->size == 0)

        return TRUE;

      rel_hdr = &d->this_hdr;

      asect->reloc_count = NUM_SHDR_ENTRIES (rel_hdr);

      rel_hdr2 = NULL;

    }

  amt = asect->reloc_count;

  amt *= 2 * sizeof (arelent);

  asect->relocation = (arelent *) bfd_alloc (abfd, amt);

  if (asect->relocation == NULL)

    return FALSE;

  /* The elf64_sparc_slurp_one_reloc_table routine increments

     canon_reloc_count.  */

  canon_reloc_count (asect) = 0;

  if (rel_hdr

      && !elf64_sparc_slurp_one_reloc_table (abfd, asect, rel_hdr, symbols,

                                             dynamic))

    return FALSE;

  if (rel_hdr2

      && !elf64_sparc_slurp_one_reloc_table (abfd, asect, rel_hdr2, symbols,

                                             dynamic))

    return FALSE;

  return TRUE;

}

/* Canonicalize the relocs.  */

static long

elf64_sparc_canonicalize_reloc (bfd *abfd, sec_ptr section,

                                arelent **relptr, asymbol **symbols)

{

  arelent *tblptr;

  unsigned int i;

  const struct elf_backend_data *bed = get_elf_backend_data (abfd);

  if (! bed->s->slurp_reloc_table (abfd, section, symbols, FALSE))

    return -1;

  tblptr = section->relocation;

  for (i = 0; i < canon_reloc_count (section); i++)

    *relptr++ = tblptr++;

  *relptr = NULL;

  return canon_reloc_count (section);

}

/* Canonicalize the dynamic relocation entries.  Note that we return

   the dynamic relocations as a single block, although they are

   actually associated with particular sections; the interface, which

   was designed for SunOS style shared libraries, expects that there

   is only one set of dynamic relocs.  Any section that was actually

   installed in the BFD, and has type SHT_REL or SHT_RELA, and uses

   the dynamic symbol table, is considered to be a dynamic reloc

   section.  */

static long

elf64_sparc_canonicalize_dynamic_reloc (bfd *abfd, arelent **storage,

                                        asymbol **syms)

{

  asection *s;

  long ret;

  if (elf_dynsymtab (abfd) == 0)

    {

      bfd_set_error (bfd_error_invalid_operation);

      return -1;

    }

  ret = 0;

  for (s = abfd->sections; s != NULL; s = s->next)

    {

      if (elf_section_data (s)->this_hdr.sh_link == elf_dynsymtab (abfd)

          && (elf_section_data (s)->this_hdr.sh_type == SHT_RELA))

        {

          arelent *p;

          long count, i;

          if (! elf64_sparc_slurp_reloc_table (abfd, s, syms, TRUE))

            return -1;

          count = canon_reloc_count (s);

          p = s->relocation;

          for (i = 0; i < count; i++)

            *storage++ = p++;

          ret += count;

        }

    }

  *storage = NULL;

  return ret;

}

/* Write out the relocs.  */

static void

elf64_sparc_write_relocs (bfd *abfd, asection *sec, PTR data)

{

  bfd_boolean *failedp = (bfd_boolean *) data;

  Elf_Internal_Shdr *rela_hdr;

  bfd_vma addr_offset;

  Elf64_External_Rela *outbound_relocas, *src_rela;

  unsigned int idx, count;

  asymbol *last_sym = 0;

  int last_sym_idx = 0;

  /* If we have already failed, don't do anything.  */

  if (*failedp)

    return;

  if ((sec->flags & SEC_RELOC) == 0)

    return;

  /* The linker backend writes the relocs out itself, and sets the

     reloc_count field to zero to inhibit writing them here.  Also,

     sometimes the SEC_RELOC flag gets set even when there aren't any

     relocs.  */

  if (sec->reloc_count == 0)

    return;

  /* We can combine two relocs that refer to the same address

     into R_SPARC_OLO10 if first one is R_SPARC_LO10 and the

     latter is R_SPARC_13 with no associated symbol.  */

  count = 0;

  for (idx = 0; idx < sec->reloc_count; idx++)

    {

      bfd_vma addr;

      ++count;

      addr = sec->orelocation[idx]->address;

      if (sec->orelocation[idx]->howto->type == R_SPARC_LO10

          && idx < sec->reloc_count - 1)

        {

          arelent *r = sec->orelocation[idx + 1];

          if (r->howto->type == R_SPARC_13

              && r->address == addr

              && bfd_is_abs_section ((*r->sym_ptr_ptr)->section)

              && (*r->sym_ptr_ptr)->value == 0)

            ++idx;

        }

    }

  rela_hdr = elf_section_data (sec)->rela.hdr;

  rela_hdr->sh_size = rela_hdr->sh_entsize * count;

  rela_hdr->contents = (PTR) bfd_alloc (abfd, rela_hdr->sh_size);

  if (rela_hdr->contents == NULL)

    {

      *failedp = TRUE;

      return;

    }

  /* Figure out whether the relocations are RELA or REL relocations.  */

  if (rela_hdr->sh_type != SHT_RELA)

    abort ();

  /* The address of an ELF reloc is section relative for an object

     file, and absolute for an executable file or shared library.

     The address of a BFD reloc is always section relative.  */

  addr_offset = 0;

  if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)

    addr_offset = sec->vma;

  /* orelocation has the data, reloc_count has the count...  */

  outbound_relocas = (Elf64_External_Rela *) rela_hdr->contents;

  src_rela = outbound_relocas;

  for (idx = 0; idx < sec->reloc_count; idx++)

    {

      Elf_Internal_Rela dst_rela;

      arelent *ptr;

      asymbol *sym;

      int n;

      ptr = sec->orelocation[idx];

      sym = *ptr->sym_ptr_ptr;

      if (sym == last_sym)

        n = last_sym_idx;

      else if (bfd_is_abs_section (sym->section) && sym->value == 0)

        n = STN_UNDEF;

      else

        {

          last_sym = sym;

          n = _bfd_elf_symbol_from_bfd_symbol (abfd, &sym);

          if (n < 0)

            {

              *failedp = TRUE;

              return;

            }

          last_sym_idx = n;

        }

      if ((*ptr->sym_ptr_ptr)->the_bfd != NULL

          && (*ptr->sym_ptr_ptr)->the_bfd->xvec != abfd->xvec

          && ! _bfd_elf_validate_reloc (abfd, ptr))

        {

          *failedp = TRUE;

          return;

        }

      if (ptr->howto->type == R_SPARC_LO10

          && idx < sec->reloc_count - 1)

        {

          arelent *r = sec->orelocation[idx + 1];

          if (r->howto->type == R_SPARC_13

              && r->address == ptr->address

              && bfd_is_abs_section ((*r->sym_ptr_ptr)->section)

              && (*r->sym_ptr_ptr)->value == 0)

            {

              idx++;

              dst_rela.r_info

                = ELF64_R_INFO (n, ELF64_R_TYPE_INFO (r->addend,

                                                      R_SPARC_OLO10));

            }

          else

            dst_rela.r_info = ELF64_R_INFO (n, R_SPARC_LO10);

        }

      else

        dst_rela.r_info = ELF64_R_INFO (n, ptr->howto->type);

      dst_rela.r_offset = ptr->address + addr_offset;

      dst_rela.r_addend = ptr->addend;

      bfd_elf64_swap_reloca_out (abfd, &dst_rela, (bfd_byte *) src_rela);

      ++src_rela;

    }

}

/* Hook called by the linker routine which adds symbols from an object

   file.  We use it for STT_REGISTER symbols.  */

static bfd_boolean

elf64_sparc_add_symbol_hook (bfd *abfd, struct bfd_link_info *info,

                             Elf_Internal_Sym *sym, const char **namep,

                             flagword *flagsp ATTRIBUTE_UNUSED,

                             asection **secp ATTRIBUTE_UNUSED,

                             bfd_vma *valp ATTRIBUTE_UNUSED)

{

  static const char *const stt_types[] = { "NOTYPE", "OBJECT", "FUNCTION" };

  if ((abfd->flags & DYNAMIC) == 0

      && (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC

          || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE))

    elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;

  if (ELF_ST_TYPE (sym->st_info) == STT_REGISTER)

    {

      int reg;

      struct _bfd_sparc_elf_app_reg *p;

      reg = (int)sym->st_value;

      switch (reg & ~1)

        {

        case 2: reg -= 2; break;

        case 6: reg -= 4; break;

        default:

          (*_bfd_error_handler)

            (_("%B: Only registers %%g[2367] can be declared using STT_REGISTER"),

             abfd);

          return FALSE;

        }

      if (info->output_bfd->xvec != abfd->xvec

          || (abfd->flags & DYNAMIC) != 0)

        {

          /* STT_REGISTER only works when linking an elf64_sparc object.

             If STT_REGISTER comes from a dynamic object, don't put it into

             the output bfd.  The dynamic linker will recheck it.  */

          *namep = NULL;

          return TRUE;

        }

      p = _bfd_sparc_elf_hash_table(info)->app_regs + reg;

      if (p->name != NULL && strcmp (p->name, *namep))

        {

          (*_bfd_error_handler)

            (_("Register %%g%d used incompatibly: %s in %B, previously %s in %B"),

             abfd, p->abfd, (int) sym->st_value,

             **namep ? *namep : "#scratch",

             *p->name ? p->name : "#scratch");

          return FALSE;

        }

      if (p->name == NULL)

        {

          if (**namep)

            {

              struct elf_link_hash_entry *h;

              h = (struct elf_link_hash_entry *)

                bfd_link_hash_lookup (info->hash, *namep, FALSE, FALSE, FALSE);

              if (h != NULL)

                {

                  unsigned char type = h->type;

                  if (type > STT_FUNC)

                    type = 0;

                  (*_bfd_error_handler)

                    (_("Symbol `%s' has differing types: REGISTER in %B, previously %s in %B"),

                     abfd, p->abfd, *namep, stt_types[type]);

                  return FALSE;

                }

              p->name = bfd_hash_allocate (&info->hash->table,

                                           strlen (*namep) + 1);

              if (!p->name)

                return FALSE;

              strcpy (p->name, *namep);

            }

          else

            p->name = "";

          p->bind = ELF_ST_BIND (sym->st_info);

          p->abfd = abfd;

          p->shndx = sym->st_shndx;

        }

      else

        {

          if (p->bind == STB_WEAK

              && ELF_ST_BIND (sym->st_info) == STB_GLOBAL)

            {

              p->bind = STB_GLOBAL;

              p->abfd = abfd;

            }

        }

      *namep = NULL;

      return TRUE;

    }

  else if (*namep && **namep

           && info->output_bfd->xvec == abfd->xvec)

    {

      int i;

      struct _bfd_sparc_elf_app_reg *p;

      p = _bfd_sparc_elf_hash_table(info)->app_regs;

      for (i = 0; i < 4; i++, p++)

        if (p->name != NULL && ! strcmp (p->name, *namep))

          {

            unsigned char type = ELF_ST_TYPE (sym->st_info);

            if (type > STT_FUNC)

              type = 0;

            (*_bfd_error_handler)

              (_("Symbol `%s' has differing types: %s in %B, previously REGISTER in %B"),

               abfd, p->abfd, *namep, stt_types[type]);

            return FALSE;

          }

    }

  return TRUE;

}

/* This function takes care of emitting STT_REGISTER symbols

   which we cannot easily keep in the symbol hash table.  */

static bfd_boolean

elf64_sparc_output_arch_syms (bfd *output_bfd ATTRIBUTE_UNUSED,

                              struct bfd_link_info *info,

                              PTR finfo,

                              int (*func) (PTR, const char *,

                                           Elf_Internal_Sym *,

                                           asection *,

                                           struct elf_link_hash_entry *))

{

  int reg;

  struct _bfd_sparc_elf_app_reg *app_regs =

    _bfd_sparc_elf_hash_table(info)->app_regs;

  Elf_Internal_Sym sym;

  /* We arranged in size_dynamic_sections to put the STT_REGISTER entries

     at the end of the dynlocal list, so they came at the end of the local

     symbols in the symtab.  Except that they aren't STB_LOCAL, so we need

     to back up symtab->sh_info.  */

  if (elf_hash_table (info)->dynlocal)

    {

      bfd * dynobj = elf_hash_table (info)->dynobj;

      asection *dynsymsec = bfd_get_section_by_name (dynobj, ".dynsym");

      struct elf_link_local_dynamic_entry *e;

      for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)

        if (e->input_indx == -1)

          break;

      if (e)

        {

          elf_section_data (dynsymsec->output_section)->this_hdr.sh_info

            = e->dynindx;

        }

    }

  if (info->strip == strip_all)

    return TRUE;

  for (reg = 0; reg < 4; reg++)

    if (app_regs [reg].name != NULL)

      {

        if (info->strip == strip_some

            && bfd_hash_lookup (info->keep_hash,

                                app_regs [reg].name,

                                FALSE, FALSE) == NULL)

          continue;

        sym.st_value = reg < 2 ? reg + 2 : reg + 4;

        sym.st_size = 0;

        sym.st_other = 0;

        sym.st_info = ELF_ST_INFO (app_regs [reg].bind, STT_REGISTER);

        sym.st_shndx = app_regs [reg].shndx;

        sym.st_target_internal = 0;

        if ((*func) (finfo, app_regs [reg].name, &sym,

                     sym.st_shndx == SHN_ABS

                     ? bfd_abs_section_ptr : bfd_und_section_ptr,

                     NULL) != 1)

          return FALSE;

      }

  return TRUE;

}

static int

elf64_sparc_get_symbol_type (Elf_Internal_Sym *elf_sym, int type)

{

  if (ELF_ST_TYPE (elf_sym->st_info) == STT_REGISTER)

    return STT_REGISTER;

  else

    return type;

}

/* A STB_GLOBAL,STT_REGISTER symbol should be BSF_GLOBAL

   even in SHN_UNDEF section.  */

static void

elf64_sparc_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED, asymbol *asym)

{

  elf_symbol_type *elfsym;

  elfsym = (elf_symbol_type *) asym;

  if (elfsym->internal_elf_sym.st_info

      == ELF_ST_INFO (STB_GLOBAL, STT_REGISTER))

    {

      asym->flags |= BSF_GLOBAL;

    }

}

/* Functions for dealing with the e_flags field.  */

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

   object file when linking.  */

static bfd_boolean

elf64_sparc_merge_private_bfd_data (bfd *ibfd, bfd *obfd)

{

  bfd_boolean error;

  flagword new_flags, old_flags;

  int new_mm, old_mm;

  if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour

      || bfd_get_flavour (obfd) != bfd_target_elf_flavour)

    return TRUE;

  new_flags = elf_elfheader (ibfd)->e_flags;

  old_flags = elf_elfheader (obfd)->e_flags;

  if (!elf_flags_init (obfd))   /* First call, no flags set */

    {

      elf_flags_init (obfd) = TRUE;

      elf_elfheader (obfd)->e_flags = new_flags;

    }

  else if (new_flags == old_flags)      /* Compatible flags are ok */

    ;

  else                                  /* Incompatible flags */

    {

      error = FALSE;

#define EF_SPARC_ISA_EXTENSIONS \

  (EF_SPARC_SUN_US1 | EF_SPARC_SUN_US3 | EF_SPARC_HAL_R1)

      if ((ibfd->flags & DYNAMIC) != 0)

        {

          /* We don't want dynamic objects memory ordering and

             architecture to have any role. That's what dynamic linker

             should do.  */

          new_flags &= ~(EF_SPARCV9_MM | EF_SPARC_ISA_EXTENSIONS);