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/* BFD library support routines for the AVR architecture.

   Copyright 1999, 2000, 2002, 2005, 2006, 2007, 2008

   Free Software Foundation, Inc.

   Contributed by Denis Chertykov <denisc@overta.ru>

   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"

/* This routine is provided two arch_infos and works out which AVR

   machine which would be compatible with both and returns a pointer

   to its info structure.  */

static const bfd_arch_info_type *

compatible (const bfd_arch_info_type * a,

            const bfd_arch_info_type * b)

{

  /* If a & b are for different architectures we can do nothing.  */

  if (a->arch != b->arch)

    return NULL;

  if (a->mach == b->mach)

    return a;

  /* avr-6 is compatible only with itself as its call convention is not

     compatible with other avr (the mcu saves the return address on 3 bytes

     instead of 2).  */

  if (a->mach == bfd_mach_avr6 || b->mach == bfd_mach_avr6)

    return NULL;

  if (a->mach < bfd_mach_avr6 && b->mach < bfd_mach_avr6)

    {

      /* Special case for ATmega[16]03 (avr:3) and ATmega83 (avr:4).  */

      if ((a->mach == bfd_mach_avr3 && b->mach == bfd_mach_avr4)

         || (a->mach == bfd_mach_avr4 && b->mach == bfd_mach_avr3))

       return NULL;

      if (a->mach <= b->mach)

       return b;

      if (a->mach >= b->mach)

       return a;

    }

  if (a->mach == bfd_mach_avr2 && b->mach == bfd_mach_avr25)

    return a;

  if (a->mach == bfd_mach_avr25 && b->mach == bfd_mach_avr2)

    return b;

  if (a->mach == bfd_mach_avr3 && b->mach == bfd_mach_avr31)

    return a;

  if (a->mach == bfd_mach_avr31 && b->mach == bfd_mach_avr3)

    return b;

  if (a->mach == bfd_mach_avr3 && b->mach == bfd_mach_avr35)

    return a;

  if (a->mach == bfd_mach_avr35 && b->mach == bfd_mach_avr3)

    return b;

  if (a->mach == bfd_mach_avr5 && b->mach == bfd_mach_avr51)

    return a;

  if (a->mach == bfd_mach_avr51 && b->mach == bfd_mach_avr5)

    return b;

  return NULL;

}

#define N(addr_bits, machine, print, default, next)             \

{                                                               \

  8,                            /* 8 bits in a word.  */        \

  addr_bits,                    /* bits in an address.  */      \

  8,                            /* 8 bits in a byte.  */        \

  bfd_arch_avr,                                                 \

  machine,                      /* Machine number.  */          \

  "avr",                        /* Architecture name.   */      \

  print,                        /* Printable name.  */          \

  1,                            /* Section align power.  */     \

  default,                      /* Is this the default ?  */    \

  compatible,                                                   \

  bfd_default_scan,                                             \

  next                                                          \

}

static const bfd_arch_info_type arch_info_struct[] =

{

  /* Assembler only.  */

  N (16, bfd_mach_avr1, "avr:1", FALSE, & arch_info_struct[1]),

  /* Classic, <= 8K.  */

  N (16, bfd_mach_avr2, "avr:2", FALSE, & arch_info_struct[2]),

  /* Classic + MOVW, <= 8K.  */

  N (16, bfd_mach_avr25, "avr:25", FALSE, & arch_info_struct[3]),

  /* Classic, > 8K, <= 64K.  */

  /* TODO:  addr_bits should be 16, but set to 22 for some following

     version of GCC (from 4.3) for backward compatibility.  */

  N (22, bfd_mach_avr3, "avr:3", FALSE, & arch_info_struct[4]),

  /* Classic, == 128K.  */

  N (22, bfd_mach_avr31, "avr:31", FALSE, & arch_info_struct[5]),

  /* Classic + MOVW + JMP/CALL, > 8K, <= 64K. */

  N (16, bfd_mach_avr35, "avr:35", FALSE, & arch_info_struct[6]),

  /* Enhanced, <= 8K.  */

  N (16, bfd_mach_avr4, "avr:4", FALSE, & arch_info_struct[7]),

  /* Enhanced, > 8K, <= 64K.  */

  /* TODO:  addr_bits should be 16, but set to 22 for some following

     version of GCC (from 4.3) for backward compatibility.  */

  N (22, bfd_mach_avr5, "avr:5", FALSE, & arch_info_struct[8]),

  /* Enhanced, == 128K.  */

  N (22, bfd_mach_avr51, "avr:51", FALSE, & arch_info_struct[9]),

  /* 3-Byte PC.  */

  N (22, bfd_mach_avr6, "avr:6", FALSE, NULL)

};

const bfd_arch_info_type bfd_avr_arch =

  N (16, bfd_mach_avr2, "avr", TRUE, & arch_info_struct[0]);