bfd/cpu-avr.c

   1 /* BFD library support routines for the AVR architecture.
   2    Copyright (C) 1999, 2000 Free Software Foundation, Inc.
   3    Contributed by Denis Chertykov <denisc@overta.ru>
   4
   5 This file is part of BFD, the Binary File Descriptor library.
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2 of the License, or
  10 (at your option) any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program; if not, write to the Free Software
  19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  20
  21 #include "bfd.h"
  22 #include "sysdep.h"
  23 #include "libbfd.h"
  24
  25
  26 static const bfd_arch_info_type *compatible
  27   PARAMS ((const bfd_arch_info_type *, const bfd_arch_info_type *));
  28
  29
  30 #define N(addr_bits, machine, print, default, next)             \
  31 {                                                               \
  32   8,                            /* 8 bits in a word */          \
  33   addr_bits,                    /* bits in an address */        \
  34   8,                            /* 8 bits in a byte */          \
  35   bfd_arch_avr,                                                 \
  36   machine,                      /* machine */                   \
  37   "avr",                        /* arch_name  */                \
  38   print,                        /* printable name */            \
  39   1,                            /* section align power */       \
  40   default,                      /* the default machine */       \
  41   compatible,                                                   \
  42   bfd_default_scan,                                             \
  43   next                                                          \
  44 }
  45
  46 static const bfd_arch_info_type arch_info_struct[] =
  47 {
  48   /* AT90S1200 */
  49   N (16, bfd_mach_avr1, "avr:1", false, & arch_info_struct[1]),
  50
  51   /* AT90S2xxx, AT90S4xxx, AT90S81xx, ATtiny22 */
  52   N (16, bfd_mach_avr2, "avr:2", false, & arch_info_struct[2]),
  53
  54   /* ATmega103, ATmega603 */
  55   N (22, bfd_mach_avr3, "avr:3", false, & arch_info_struct[3]),
  56
  57   /* ATmega161 */
  58   N (16, bfd_mach_avr4, "avr:4", false, NULL)
  59 };
  60
  61 const bfd_arch_info_type bfd_avr_arch =
  62   N (16, bfd_mach_avr2, "avr", true, & arch_info_struct[0]);
  63
  64 /* This routine is provided two arch_infos and works out which AVR
  65    machine which would be compatible with both and returns a pointer
  66    to its info structure.  */
  67
  68 static const bfd_arch_info_type *
  69 compatible (a,b)
  70      const bfd_arch_info_type * a;
  71      const bfd_arch_info_type * b;
  72 {
  73   /* If a & b are for different architectures we can do nothing.  */
  74   if (a->arch != b->arch)
  75     return NULL;
  76
  77   /* Special case for ATmega[16]03 (avr:3) and ATmega161 (avr:4).  */
  78   if ((a->mach == 3 && b->mach == 4)
  79       || (a->mach == 4 && b->mach == 3))
  80     return NULL;
  81
  82   /* So far all newer AVR architecture cores are supersets of previous
  83      cores.  */
  84   if (a->mach <= b->mach)
  85     return b;
  86
  87   /* Never reached!  */
  88   return NULL;
  89 }