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/* FR30-specific support for 32-bit ELF.

   Copyright (C) 1998, 1999 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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include "bfd.h"

#include "sysdep.h"

#include "libbfd.h"

#include "elf-bfd.h"

#include "elf/fr30.h"

/* Forward declarations.  */

static bfd_reloc_status_type fr30_elf_i20_reloc

  PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));

static bfd_reloc_status_type fr30_elf_i32_reloc

  PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));

static reloc_howto_type * fr30_reloc_type_lookup

  PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));

static void fr30_info_to_howto_rela

  PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));

static boolean fr30_elf_relocate_section

  PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));

static bfd_reloc_status_type fr30_final_link_relocate

  PARAMS ((reloc_howto_type *, bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma));

static boolean fr30_elf_gc_sweep_hook

  PARAMS ((bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *));

static asection * fr30_elf_gc_mark_hook

  PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *, struct elf_link_hash_entry *, Elf_Internal_Sym *));

static reloc_howto_type fr30_elf_howto_table [] =

{

  /* This reloc does nothing.  */

  HOWTO (R_FR30_NONE,           /* type */

         0,                      /* rightshift */

         2,                     /* size (0 = byte, 1 = short, 2 = long) */

         32,                    /* bitsize */

         false,                 /* pc_relative */

         0,                      /* bitpos */

         complain_overflow_bitfield, /* complain_on_overflow */

         bfd_elf_generic_reloc, /* special_function */

         "R_FR30_NONE",         /* name */

         false,                 /* partial_inplace */

         0,                      /* src_mask */

         0,                      /* dst_mask */

         false),                /* pcrel_offset */

  /* An 8 bit absolute relocation.  */

  HOWTO (R_FR30_8,              /* type */

         0,                      /* rightshift */

         1,                     /* size (0 = byte, 1 = short, 2 = long) */

         8,                     /* bitsize */

         false,                 /* pc_relative */

         4,                     /* bitpos */

         complain_overflow_bitfield, /* complain_on_overflow */

         bfd_elf_generic_reloc, /* special_function */

         "R_FR30_8",            /* name */

         true,                  /* partial_inplace */

         0x0000,                /* src_mask */

         0x0ff0,                /* dst_mask */

         false),                /* pcrel_offset */

  /* A 20 bit absolute relocation.  */

  HOWTO (R_FR30_20,             /* type */

         0,                      /* rightshift */

         2,                     /* size (0 = byte, 1 = short, 2 = long) */

         20,                    /* bitsize */

         false,                 /* pc_relative */

         0,                      /* bitpos */

         complain_overflow_bitfield, /* complain_on_overflow */

         fr30_elf_i20_reloc,    /* special_function */

         "R_FR30_20",           /* name */

         true,                  /* partial_inplace */

         0x00000000,            /* src_mask */

         0x00f0ffff,            /* dst_mask */

         false),                /* pcrel_offset */

  /* A 32 bit absolute relocation.  */

  HOWTO (R_FR30_32,             /* type */

         0,                      /* rightshift */

         2,                     /* size (0 = byte, 1 = short, 2 = long) */

         32,                    /* bitsize */

         false,                 /* pc_relative */

         0,                      /* bitpos */

         complain_overflow_bitfield, /* complain_on_overflow */

         bfd_elf_generic_reloc, /* special_function */

         "R_FR30_32",           /* name */

         true,                  /* partial_inplace */

         0x00000000,            /* src_mask */

         0xffffffff,            /* dst_mask */

         false),                /* pcrel_offset */

  /* A 32 bit into 48 bits absolute relocation.  */

  HOWTO (R_FR30_48,             /* type */

         0,                      /* rightshift */

         2,                     /* size (0 = byte, 1 = short, 2 = long) */

         32,                    /* bitsize */

         false,                 /* pc_relative */

         0,                      /* bitpos */

         complain_overflow_bitfield, /* complain_on_overflow */

         fr30_elf_i32_reloc,    /* special_function */

         "R_FR30_48",           /* name */

         true,                  /* partial_inplace */

         0x00000000,            /* src_mask */

         0xffffffff,            /* dst_mask */

         false),                /* pcrel_offset */

  /* A 6 bit absolute relocation.  */

  HOWTO (R_FR30_6_IN_4,         /* type */

         2,                     /* rightshift */

         1,                     /* size (0 = byte, 1 = short, 2 = long) */

         6,                     /* bitsize */

         false,                 /* pc_relative */

         4,                     /* bitpos */

         complain_overflow_unsigned, /* complain_on_overflow */

         bfd_elf_generic_reloc, /* special_function */

         "R_FR30_6_IN_4",       /* name */

         true,                  /* partial_inplace */

         0x0000,                /* src_mask */

         0x00f0,                /* dst_mask */

         false),                /* pcrel_offset */

  /* An 8 bit absolute relocation.  */

  HOWTO (R_FR30_8_IN_8,         /* type */

         0,                      /* rightshift */

         1,                     /* size (0 = byte, 1 = short, 2 = long) */

         8,                     /* bitsize */

         false,                 /* pc_relative */

         4,                     /* bitpos */

         complain_overflow_signed, /* complain_on_overflow */

         bfd_elf_generic_reloc,/* special_function */

         "R_FR30_8_IN_8",       /* name */

         true,                  /* partial_inplace */

         0x0000,                /* src_mask */

         0x0ff0,                /* dst_mask */

         false),                /* pcrel_offset */

  /* A 9 bit absolute relocation.  */

  HOWTO (R_FR30_9_IN_8,         /* type */

         1,                     /* rightshift */

         1,                     /* size (0 = byte, 1 = short, 2 = long) */

         9,                     /* bitsize */

         false,                 /* pc_relative */

         4,                     /* bitpos */

         complain_overflow_signed, /* complain_on_overflow */

         bfd_elf_generic_reloc,/* special_function */

         "R_FR30_9_IN_8",       /* name */

         true,                  /* partial_inplace */

         0x0000,                /* src_mask */

         0x0ff0,                /* dst_mask */

         false),                /* pcrel_offset */

  /* A 10 bit absolute relocation.  */

  HOWTO (R_FR30_10_IN_8,        /* type */

         2,                     /* rightshift */

         1,                     /* size (0 = byte, 1 = short, 2 = long) */

         10,                    /* bitsize */

         false,                 /* pc_relative */

         4,                     /* bitpos */

         complain_overflow_signed, /* complain_on_overflow */

         bfd_elf_generic_reloc,/* special_function */

         "R_FR30_10_IN_8",      /* name */

         true,                  /* partial_inplace */

         0x0000,                /* src_mask */

         0x0ff0,                /* dst_mask */

         false),                /* pcrel_offset */

  /* A PC relative 9 bit relocation, right shifted by 1.  */

  HOWTO (R_FR30_9_PCREL,        /* type */

         1,                     /* rightshift */

         1,                     /* size (0 = byte, 1 = short, 2 = long) */

         9,                     /* bitsize */

         true,                  /* pc_relative */

         0,                      /* bitpos */

         complain_overflow_signed, /* complain_on_overflow */

         bfd_elf_generic_reloc, /* special_function */

         "R_FR30_9_PCREL",      /* name */

         false,                 /* partial_inplace */

         0x0000,                /* src_mask */

         0x00ff,                /* dst_mask */

         false),                /* pcrel_offset */

  /* A PC relative 12 bit relocation, right shifted by 1.  */

  HOWTO (R_FR30_12_PCREL,       /* type */

         1,                     /* rightshift */

         1,                     /* size (0 = byte, 1 = short, 2 = long) */

         12,                    /* bitsize */

         true,                  /* pc_relative */

         0,                      /* bitpos */

         complain_overflow_signed, /* complain_on_overflow */

         bfd_elf_generic_reloc, /* special_function */

         "R_FR30_12_PCREL",     /* name */

         false,                 /* partial_inplace */

         0x0000,                /* src_mask */

         0x07ff,                /* dst_mask */

         false),                /* pcrel_offset */

  /* GNU extension to record C++ vtable hierarchy */

  HOWTO (R_FR30_GNU_VTINHERIT, /* type */

         0,                     /* rightshift */

         2,                     /* size (0 = byte, 1 = short, 2 = long) */

         0,                     /* bitsize */

         false,                 /* pc_relative */

         0,                     /* bitpos */

         complain_overflow_dont, /* complain_on_overflow */

         NULL,                  /* special_function */

         "R_FR30_GNU_VTINHERIT", /* name */

         false,                 /* partial_inplace */

         0,                     /* src_mask */

         0,                     /* dst_mask */

         false),                /* pcrel_offset */

  /* GNU extension to record C++ vtable member usage */

  HOWTO (R_FR30_GNU_VTENTRY,     /* type */

         0,                     /* rightshift */

         2,                     /* size (0 = byte, 1 = short, 2 = long) */

         0,                     /* bitsize */

         false,                 /* pc_relative */

         0,                     /* bitpos */

         complain_overflow_dont, /* complain_on_overflow */

         _bfd_elf_rel_vtable_reloc_fn,  /* special_function */

         "R_FR30_GNU_VTENTRY",   /* name */

         false,                 /* partial_inplace */

         0,                     /* src_mask */

         0,                     /* dst_mask */

         false),                /* pcrel_offset */

};

/* Utility to actually perform an R_FR30_20 reloc.  */

static bfd_reloc_status_type

fr30_elf_i20_reloc (abfd, reloc_entry, symbol, data,

                    input_section, output_bfd, error_message)

     bfd *      abfd;

     arelent *  reloc_entry;

     asymbol *  symbol;

     PTR        data;

     asection * input_section;

     bfd *      output_bfd;

     char **    error_message ATTRIBUTE_UNUSED;

{

  bfd_vma       relocation;

  unsigned long x;

  /* This part is from bfd_elf_generic_reloc.  */

  if (output_bfd != (bfd *) NULL

      && (symbol->flags & BSF_SECTION_SYM) == 0

      && (! reloc_entry->howto->partial_inplace

          || reloc_entry->addend == 0))

    {

      reloc_entry->address += input_section->output_offset;

      return bfd_reloc_ok;

    }

  if (output_bfd != NULL)

    /* FIXME: See bfd_perform_relocation.  Is this right?  */

    return bfd_reloc_ok;

  relocation =

    symbol->value

    + symbol->section->output_section->vma

    + symbol->section->output_offset

    + reloc_entry->addend;

  if (relocation > ((1U << 20) - 1))

    return bfd_reloc_overflow;

  x = bfd_get_32 (abfd, data + reloc_entry->address);

  x = (x & 0xff0f0000) | (relocation & 0x0000ffff) | ((relocation & 0x000f0000) << 4);

  bfd_put_32 (abfd, x, data + reloc_entry->address);

  return bfd_reloc_ok;

}

/* Utility to actually perform a R_FR30_48 reloc.  */

static bfd_reloc_status_type

fr30_elf_i32_reloc (abfd, reloc_entry, symbol, data,

                    input_section, output_bfd, error_message)

     bfd *      abfd;

     arelent *  reloc_entry;

     asymbol *  symbol;

     PTR        data;

     asection * input_section;

     bfd *      output_bfd;

     char **    error_message ATTRIBUTE_UNUSED;

{

  bfd_vma       relocation;

  /* This part is from bfd_elf_generic_reloc.  */

  if (output_bfd != (bfd *) NULL

      && (symbol->flags & BSF_SECTION_SYM) == 0

      && (! reloc_entry->howto->partial_inplace

          || reloc_entry->addend == 0))

    {

      reloc_entry->address += input_section->output_offset;

      return bfd_reloc_ok;

    }

  if (output_bfd != NULL)

    /* FIXME: See bfd_perform_relocation.  Is this right?  */

    return bfd_reloc_ok;

  relocation =

    symbol->value

    + symbol->section->output_section->vma

    + symbol->section->output_offset

    + reloc_entry->addend;

  bfd_put_32 (abfd, relocation, data + reloc_entry->address + 2);

  return bfd_reloc_ok;

}

/* Map BFD reloc types to FR30 ELF reloc types.  */

struct fr30_reloc_map

{

  bfd_reloc_code_real_type bfd_reloc_val;

  unsigned int fr30_reloc_val;

};

static const struct fr30_reloc_map fr30_reloc_map [] =

{

  { BFD_RELOC_NONE,           R_FR30_NONE },

  { BFD_RELOC_8,              R_FR30_8 },

  { BFD_RELOC_FR30_20,        R_FR30_20 },

  { BFD_RELOC_32,             R_FR30_32 },

  { BFD_RELOC_FR30_48,        R_FR30_48 },

  { BFD_RELOC_FR30_6_IN_4,    R_FR30_6_IN_4 },

  { BFD_RELOC_FR30_8_IN_8,    R_FR30_8_IN_8 },

  { BFD_RELOC_FR30_9_IN_8,    R_FR30_9_IN_8 },

  { BFD_RELOC_FR30_10_IN_8,   R_FR30_10_IN_8 },

  { BFD_RELOC_FR30_9_PCREL,   R_FR30_9_PCREL },

  { BFD_RELOC_FR30_12_PCREL,  R_FR30_12_PCREL },

  { BFD_RELOC_VTABLE_INHERIT, R_FR30_GNU_VTINHERIT },

  { BFD_RELOC_VTABLE_ENTRY,   R_FR30_GNU_VTENTRY },

};

static reloc_howto_type *

fr30_reloc_type_lookup (abfd, code)

     bfd * abfd ATTRIBUTE_UNUSED;

     bfd_reloc_code_real_type code;

{

  unsigned int i;

  for (i = sizeof (fr30_reloc_map) / sizeof (fr30_reloc_map[0]);

       --i;)

    if (fr30_reloc_map [i].bfd_reloc_val == code)

      return & fr30_elf_howto_table [fr30_reloc_map[i].fr30_reloc_val];

  return NULL;

}

/* Set the howto pointer for an FR30 ELF reloc.  */

static void

fr30_info_to_howto_rela (abfd, cache_ptr, dst)

     bfd * abfd ATTRIBUTE_UNUSED;

     arelent * cache_ptr;

     Elf32_Internal_Rela * dst;

{

  unsigned int r_type;

  r_type = ELF32_R_TYPE (dst->r_info);

  BFD_ASSERT (r_type < (unsigned int) R_FR30_max);

  cache_ptr->howto = & fr30_elf_howto_table [r_type];

}

/* Perform a single relocation.  By default we use the standard BFD

   routines, but a few relocs, we have to do them ourselves.  */

static bfd_reloc_status_type

fr30_final_link_relocate (howto, input_bfd, input_section, contents, rel, relocation)

     reloc_howto_type *  howto;

     bfd *               input_bfd;

     asection *          input_section;

     bfd_byte *          contents;

     Elf_Internal_Rela * rel;

     bfd_vma             relocation;

{

  bfd_reloc_status_type r = bfd_reloc_ok;

  bfd_vma               x;

  bfd_signed_vma        srel;

  switch (howto->type)

    {

    case R_FR30_20:

      contents   += rel->r_offset;

      relocation += rel->r_addend;

      if (relocation > ((1 << 20) - 1))

        return bfd_reloc_overflow;

      x = bfd_get_32 (input_bfd, contents);

      x = (x & 0xff0f0000) | (relocation & 0x0000ffff) | ((relocation & 0x000f0000) << 4);

      bfd_put_32 (input_bfd, x, contents);

      break;

    case R_FR30_48:

      contents   += rel->r_offset + 2;

      relocation += rel->r_addend;

      bfd_put_32 (input_bfd, relocation, contents);

      break;

    case R_FR30_9_PCREL:

      contents   += rel->r_offset + 1;

      srel = (bfd_signed_vma) relocation;

      srel += rel->r_addend;

      srel -= rel->r_offset;

      srel -= 2;  /* Branch instructions add 2 to the PC... */

      srel -= (input_section->output_section->vma +

                     input_section->output_offset);

      if (srel & 1)

        return bfd_reloc_outofrange;

      if (srel > ((1 << 8) - 1) || (srel < - (1 << 8)))

        return bfd_reloc_overflow;

      bfd_put_8 (input_bfd, srel >> 1, contents);

      break;

    case R_FR30_12_PCREL:

      contents   += rel->r_offset;

      srel = (bfd_signed_vma) relocation;

      srel += rel->r_addend;

      srel -= rel->r_offset;

      srel -= 2; /* Branch instructions add 2 to the PC... */

      srel -= (input_section->output_section->vma +

                     input_section->output_offset);

      if (srel & 1)

        return bfd_reloc_outofrange;

      if (srel > ((1 << 11) - 1) || (srel < - (1 << 11)))

          return bfd_reloc_overflow;

      x = bfd_get_16 (input_bfd, contents);

      x = (x & 0xf800) | ((srel >> 1) & 0x7ff);

      bfd_put_16 (input_bfd, x, contents);

      break;

    default:

      r = _bfd_final_link_relocate (howto, input_bfd, input_section,

                                    contents, rel->r_offset,

                                    relocation, rel->r_addend);

    }

  return r;

}

/* Relocate an FR30 ELF section.

   There is some attempt to make this function usable for many architectures,

   both USE_REL and USE_RELA ['twould be nice if such a critter existed],

   if only to serve as a learning tool.

   The RELOCATE_SECTION function is called by the new ELF backend linker

   to handle the relocations for a section.

   The relocs are always passed as Rela structures; if the section

   actually uses Rel structures, the r_addend field will always be

   zero.

   This function is responsible for adjusting the section contents as

   necessary, and (if using Rela relocs and generating a relocateable

   output file) adjusting the reloc addend as necessary.

   This function does not have to worry about setting the reloc

   address or the reloc symbol index.

   LOCAL_SYMS is a pointer to the swapped in local symbols.

   LOCAL_SECTIONS is an array giving the section in the input file

   corresponding to the st_shndx field of each local symbol.

   The global hash table entry for the global symbols can be found

   via elf_sym_hashes (input_bfd).

   When generating relocateable output, this function must handle

   STB_LOCAL/STT_SECTION symbols specially.  The output symbol is

   going to be the section symbol corresponding to the output

   section, which means that the addend must be adjusted

   accordingly.  */

static boolean

fr30_elf_relocate_section (output_bfd, info, input_bfd, input_section,

                           contents, relocs, local_syms, local_sections)

     bfd *                   output_bfd ATTRIBUTE_UNUSED;

     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;

{

  Elf_Internal_Shdr *           symtab_hdr;

  struct elf_link_hash_entry ** sym_hashes;

  Elf_Internal_Rela *           rel;

  Elf_Internal_Rela *           relend;

  symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;

  sym_hashes = elf_sym_hashes (input_bfd);

  relend     = relocs + input_section->reloc_count;

  for (rel = relocs; rel < relend; rel ++)

    {

      reloc_howto_type *           howto;

      unsigned long                r_symndx;

      Elf_Internal_Sym *           sym;

      asection *                   sec;

      struct elf_link_hash_entry * h;

      bfd_vma                      relocation;

      bfd_reloc_status_type        r;

      const char *                 name = NULL;

      int                          r_type;

      r_type = ELF32_R_TYPE (rel->r_info);

      if (   r_type == R_FR30_GNU_VTINHERIT

          || r_type == R_FR30_GNU_VTENTRY)

        continue;

      r_symndx = ELF32_R_SYM (rel->r_info);

      if (info->relocateable)

        {

          /* This is a relocateable link.  We don't have to change

             anything, unless the reloc is against a section symbol,

             in which case we have to adjust according to where the

             section symbol winds up in the output section.  */

          if (r_symndx < symtab_hdr->sh_info)

            {

              sym = local_syms + r_symndx;

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

                {

                  sec = local_sections [r_symndx];

                  rel->r_addend += sec->output_offset + sym->st_value;

                }

            }

          continue;

        }

      /* This is a final link.  */

      howto  = fr30_elf_howto_table + ELF32_R_TYPE (rel->r_info);

      h      = NULL;

      sym    = NULL;

      sec    = NULL;

      if (r_symndx < symtab_hdr->sh_info)

        {

          sym = local_syms + r_symndx;

          sec = local_sections [r_symndx];

          relocation = (sec->output_section->vma

                        + sec->output_offset

                        + sym->st_value);

          name = bfd_elf_string_from_elf_section

            (input_bfd, symtab_hdr->sh_link, sym->st_name);

          name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;

#if 0

          fprintf (stderr, "local: sec: %s, sym: %s (%d), value: %x + %x + %x addend %x\n",

                   sec->name, name, sym->st_name,

                   sec->output_section->vma, sec->output_offset,

                   sym->st_value, rel->r_addend);

#endif

        }

      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;

          name = h->root.root.string;

          if (h->root.type == bfd_link_hash_defined

              || h->root.type == bfd_link_hash_defweak)

            {

              sec = h->root.u.def.section;

              relocation = (h->root.u.def.value

                            + sec->output_section->vma

                            + sec->output_offset);

#if 0

              fprintf (stderr,

                       "defined: sec: %s, name: %s, value: %x + %x + %x gives: %x\n",

                       sec->name, name, h->root.u.def.value,

                       sec->output_section->vma, sec->output_offset, relocation);

#endif

            }

          else if (h->root.type == bfd_link_hash_undefweak)

            {

#if 0

              fprintf (stderr, "undefined: sec: %s, name: %s\n",

                       sec->name, name);

#endif

              relocation = 0;

            }

          else

            {

              if (! ((*info->callbacks->undefined_symbol)

                     (info, h->root.root.string, input_bfd,

                      input_section, rel->r_offset, true)))

                return false;

#if 0

              fprintf (stderr, "unknown: name: %s\n", name);

#endif

              relocation = 0;

            }

        }

      r = fr30_final_link_relocate (howto, input_bfd, input_section,

                                     contents, rel, relocation);

      if (r != bfd_reloc_ok)

        {

          const char * msg = (const char *) NULL;

          switch (r)

            {

            case bfd_reloc_overflow:

              r = info->callbacks->reloc_overflow

                (info, name, howto->name, (bfd_vma) 0,

                 input_bfd, input_section, rel->r_offset);

              break;

            case bfd_reloc_undefined:

              r = info->callbacks->undefined_symbol

                (info, name, input_bfd, input_section, rel->r_offset,

                 true);

              break;

            case bfd_reloc_outofrange:

              msg = _("internal error: out of range error");

              break;

            case bfd_reloc_notsupported:

              msg = _("internal error: unsupported relocation error");

              break;

            case bfd_reloc_dangerous:

              msg = _("internal error: dangerous relocation");

              break;

            default:

              msg = _("internal error: unknown error");

              break;

            }

          if (msg)

            r = info->callbacks->warning

              (info, msg, name, input_bfd, input_section, rel->r_offset);

          if (! r)

            return false;

        }

    }

  return true;

}

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

   relocation.  */

static asection *

fr30_elf_gc_mark_hook (abfd, info, rel, h, sym)