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/* ARC-specific support for 32-bit ELF

   Copyright (C) 1994, 1995, 1997, 1999 Free Software Foundation, Inc.

   Contributed by Doug Evans (dje@cygnus.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 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/arc.h"

static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup

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

static void arc_info_to_howto_rel

  PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *));

static boolean arc_elf_object_p PARAMS ((bfd *));

static void arc_elf_final_write_processing PARAMS ((bfd *, boolean));

/* Try to minimize the amount of space occupied by relocation tables

   on the ROM (not that the ROM won't be swamped by other ELF overhead).  */

#define USE_REL

static reloc_howto_type elf_arc_howto_table[] =

{

  /* This reloc does nothing.  */

  HOWTO (R_ARC_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_ARC_NONE",          /* name */

         false,                 /* partial_inplace */

         0,                      /* src_mask */

         0,                      /* dst_mask */

         false),                /* pcrel_offset */

  /* A standard 32 bit relocation.  */

  HOWTO (R_ARC_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_ARC_32",            /* name */

         false,                 /* partial_inplace */

         0xffffffff,            /* src_mask */

         0xffffffff,            /* dst_mask */

         false),                /* pcrel_offset */

  /* A 26 bit absolute branch, right shifted by 2.  */

  HOWTO (R_ARC_B26,             /* type */

         2,                     /* rightshift */

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

         26,                    /* bitsize */

         false,                 /* pc_relative */

         0,                      /* bitpos */

         complain_overflow_bitfield, /* complain_on_overflow */

         bfd_elf_generic_reloc, /* special_function */

         "R_ARC_B26",           /* name */

         false,                 /* partial_inplace */

         0x00ffffff,            /* src_mask */

         0x00ffffff,            /* dst_mask */

         false),                /* pcrel_offset */

  /* A relative 22 bit branch; bits 21-2 are stored in bits 26-7.  */

  HOWTO (R_ARC_B22_PCREL,       /* type */

         2,                     /* rightshift */

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

         22,                    /* bitsize */

         true,                  /* pc_relative */

         7,                     /* bitpos */

         complain_overflow_signed, /* complain_on_overflow */

         bfd_elf_generic_reloc, /* special_function */

         "R_ARC_B22_PCREL",     /* name */

         false,                 /* partial_inplace */

         0x07ffff80,            /* src_mask */

         0x07ffff80,            /* dst_mask */

         true),                 /* pcrel_offset */

};

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

struct arc_reloc_map

{

  bfd_reloc_code_real_type bfd_reloc_val;

  unsigned char elf_reloc_val;

};

static const struct arc_reloc_map arc_reloc_map[] =

{

  { BFD_RELOC_NONE, R_ARC_NONE, },

  { BFD_RELOC_32, R_ARC_32 },

  { BFD_RELOC_CTOR, R_ARC_32 },

  { BFD_RELOC_ARC_B26, R_ARC_B26 },

  { BFD_RELOC_ARC_B22_PCREL, R_ARC_B22_PCREL },

};

static reloc_howto_type *

bfd_elf32_bfd_reloc_type_lookup (abfd, code)

     bfd *abfd ATTRIBUTE_UNUSED;

     bfd_reloc_code_real_type code;

{

  unsigned int i;

  for (i = 0;

       i < sizeof (arc_reloc_map) / sizeof (struct arc_reloc_map);

       i++)

    {

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

        return &elf_arc_howto_table[arc_reloc_map[i].elf_reloc_val];

    }

  return NULL;

}

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

static void

arc_info_to_howto_rel (abfd, cache_ptr, dst)

     bfd *abfd ATTRIBUTE_UNUSED;

     arelent *cache_ptr;

     Elf32_Internal_Rel *dst;

{

  unsigned int r_type;

  r_type = ELF32_R_TYPE (dst->r_info);

  BFD_ASSERT (r_type < (unsigned int) R_ARC_max);

  cache_ptr->howto = &elf_arc_howto_table[r_type];

}

/* Set the right machine number for an ARC ELF file.  */

static boolean

arc_elf_object_p (abfd)

     bfd *abfd;

{

  int mach;

  unsigned long arch = elf_elfheader (abfd)->e_flags & EF_ARC_MACH;

  switch (arch)

    {

    case E_ARC_MACH_BASE:

      mach = bfd_mach_arc_base;

      break;

    default:

      /* Unknown cpu type.  ??? What to do?  */

      return false;

    }

  (void) bfd_default_set_arch_mach (abfd, bfd_arch_arc, mach);

  return true;

}

/* The final processing done just before writing out an ARC ELF object file.

   This gets the ARC architecture right based on the machine number.  */

static void

arc_elf_final_write_processing (abfd, linker)

     bfd *abfd;

     boolean linker ATTRIBUTE_UNUSED;

{

  int mach;

  unsigned long val;

  switch (mach = bfd_get_mach (abfd))

    {

    case bfd_mach_arc_base:

      val = E_ARC_MACH_BASE;

      break;

    default:

      return;

    }

  elf_elfheader (abfd)->e_flags &=~ EF_ARC_MACH;

  elf_elfheader (abfd)->e_flags |= val;

}

#define TARGET_LITTLE_SYM       bfd_elf32_littlearc_vec

#define TARGET_LITTLE_NAME      "elf32-littlearc"

#define TARGET_BIG_SYM          bfd_elf32_bigarc_vec

#define TARGET_BIG_NAME         "elf32-bigarc"

#define ELF_ARCH                bfd_arch_arc

#define ELF_MACHINE_CODE        EM_CYGNUS_ARC

#define ELF_MAXPAGESIZE         0x1000

#define elf_info_to_howto       0

#define elf_info_to_howto_rel   arc_info_to_howto_rel

#define elf_backend_object_p    arc_elf_object_p

#define elf_backend_final_write_processing \

                                arc_elf_final_write_processing

#include "elf32-target.h"