gnu/dist/gdb6/bfd/cpu-avr.c

   1 /* BFD library support routines for the AVR architecture.
   2    Copyright 1999, 2000, 2002, 2006 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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  20
  21 #include "bfd.h"
  22 #include "sysdep.h"
  23 #include "libbfd.h"
  24
  25 /* This routine is provided two arch_infos and works out which AVR
  26    machine which would be compatible with both and returns a pointer
  27    to its info structure.  */
  28
  29 static const bfd_arch_info_type *
  30 compatible (const bfd_arch_info_type * a,
  31             const bfd_arch_info_type * b)
  32 {
  33   /* If a & b are for different architectures we can do nothing.  */
  34   if (a->arch != b->arch)
  35     return NULL;
  36
  37   /* Special case for ATmega[16]03 (avr:3) and ATmega83 (avr:4).  */
  38   if ((a->mach == bfd_mach_avr3 && b->mach == bfd_mach_avr4)
  39       || (a->mach == bfd_mach_avr4 && b->mach == bfd_mach_avr3))
  40     return NULL;
  41
  42   /* So far all newer AVR architecture cores are supersets of previous
  43      cores.  */
  44   if (a->mach <= b->mach)
  45     return b;
  46
  47   if (a->mach >= b->mach)
  48     return a;
  49
  50   /* Never reached!  */
  51   return NULL;
  52 }
  53
  54 #define N(addr_bits, machine, print, default, next)             \
  55 {                                                               \
  56   8,                            /* 8 bits in a word.  */        \
  57   addr_bits,                    /* bits in an address.  */      \
  58   8,                            /* 8 bits in a byte.  */        \
  59   bfd_arch_avr,                                                 \
  60   machine,                      /* Machine number.  */          \
  61   "avr",                        /* Architecture name.   */      \
  62   print,                        /* Printable name.  */          \
  63   1,                            /* Section align power.  */     \
  64   default,                      /* Is this the default ?  */    \
  65   compatible,                                                   \
  66   bfd_default_scan,                                             \
  67   next                                                          \
  68 }
  69
  70 static const bfd_arch_info_type arch_info_struct[] =
  71 {
  72   /* AT90S1200, ATtiny1x, ATtiny28.  */
  73   N (16, bfd_mach_avr1, "avr:1", FALSE, & arch_info_struct[1]),
  74
  75   /* AT90S2xxx, AT90S4xxx, AT90S8xxx, ATtiny22.  */
  76   N (16, bfd_mach_avr2, "avr:2", FALSE, & arch_info_struct[2]),
  77
  78   /* ATmega103, ATmega603.  */
  79   N (22, bfd_mach_avr3, "avr:3", FALSE, & arch_info_struct[3]),
  80
  81   /* ATmega83, ATmega85.  */
  82   N (16, bfd_mach_avr4, "avr:4", FALSE, & arch_info_struct[4]),
  83
  84   /* ATmega161, ATmega163, ATmega32, AT94K.  */
  85   N (22, bfd_mach_avr5, "avr:5", FALSE, NULL)
  86 };
  87
  88 const bfd_arch_info_type bfd_avr_arch =
  89   N (16, bfd_mach_avr2, "avr", TRUE, & arch_info_struct[0]);