bfd/cpu-avr.c

   1 /* BFD library support routines for the AVR architecture.
   2    Copyright 1999, 2000, 2002, 2006, 2007 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 3 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,
  20    MA 02110-1301, USA.  */
  21
  22 #include "sysdep.h"
  23 #include "bfd.h"
  24 #include "libbfd.h"
  25
  26 /* This routine is provided two arch_infos and works out which AVR
  27    machine which would be compatible with both and returns a pointer
  28    to its info structure.  */
  29
  30 static const bfd_arch_info_type *
  31 compatible (const bfd_arch_info_type * a,
  32             const bfd_arch_info_type * b)
  33 {
  34   /* If a & b are for different architectures we can do nothing.  */
  35   if (a->arch != b->arch)
  36     return NULL;
  37
  38   if (a->mach == b->mach)
  39     return a;
  40
  41   /* avr-6 is compatible only with itself as its call convention is not
  42      compatible with other avr (the mcu saves the return address on 3 bytes
  43      instead of 2).  */
  44   if (a->mach == bfd_mach_avr6 || b->mach == bfd_mach_avr6)
  45     return NULL;
  46
  47   if (a->mach < bfd_mach_avr6 && b->mach < bfd_mach_avr6)
  48     {
  49       /* Special case for ATmega[16]03 (avr:3) and ATmega83 (avr:4).  */
  50       if ((a->mach == bfd_mach_avr3 && b->mach == bfd_mach_avr4)
  51          || (a->mach == bfd_mach_avr4 && b->mach == bfd_mach_avr3))
  52        return NULL;
  53
  54       if (a->mach <= b->mach)
  55        return b;
  56
  57       if (a->mach >= b->mach)
  58        return a;
  59     }
  60
  61   if (a->mach == bfd_mach_avr2 && b->mach == bfd_mach_avr25)
  62     return a;
  63   if (a->mach == bfd_mach_avr25 && b->mach == bfd_mach_avr2)
  64     return b;
  65
  66   if (a->mach == bfd_mach_avr3 && b->mach == bfd_mach_avr31)
  67     return a;
  68   if (a->mach == bfd_mach_avr31 && b->mach == bfd_mach_avr3)
  69     return b;
  70
  71   if (a->mach == bfd_mach_avr3 && b->mach == bfd_mach_avr35)
  72     return a;
  73   if (a->mach == bfd_mach_avr35 && b->mach == bfd_mach_avr3)
  74     return b;
  75
  76   if (a->mach == bfd_mach_avr5 && b->mach == bfd_mach_avr51)
  77     return a;
  78   if (a->mach == bfd_mach_avr51 && b->mach == bfd_mach_avr5)
  79     return b;
  80
  81
  82   return NULL;
  83 }
  84
  85 #define N(addr_bits, machine, print, default, next)             \
  86 {                                                               \
  87   8,                            /* 8 bits in a word.  */        \
  88   addr_bits,                    /* bits in an address.  */      \
  89   8,                            /* 8 bits in a byte.  */        \
  90   bfd_arch_avr,                                                 \
  91   machine,                      /* Machine number.  */          \
  92   "avr",                        /* Architecture name.   */      \
  93   print,                        /* Printable name.  */          \
  94   1,                            /* Section align power.  */     \
  95   default,                      /* Is this the default ?  */    \
  96   compatible,                                                   \
  97   bfd_default_scan,                                             \
  98   next                                                          \
  99 }
 100
 101 static const bfd_arch_info_type arch_info_struct[] =
 102 {
 103   /* Assembler only.  */
 104   N (16, bfd_mach_avr1, "avr:1", FALSE, & arch_info_struct[1]),
 105
 106   /* Classic, <= 8K.  */
 107   N (16, bfd_mach_avr2, "avr:2", FALSE, & arch_info_struct[2]),
 108
 109   /* Classic + MOVW, <= 8K.  */
 110   N (16, bfd_mach_avr25, "avr:25", FALSE, & arch_info_struct[3]),
 111
 112   /* Classic, > 8K, <= 64K.  */
 113   /* TODO:  addr_bits should be 16, but set to 22 for some following
 114      version of GCC (from 4.3) for backward compatibility.  */
 115   N (22, bfd_mach_avr3, "avr:3", FALSE, & arch_info_struct[4]),
 116
 117   /* Classic, == 128K.  */
 118   N (22, bfd_mach_avr31, "avr:31", FALSE, & arch_info_struct[5]),
 119
 120   /* Classic + MOVW + JMP/CALL, > 8K, <= 64K. */
 121   N (16, bfd_mach_avr35, "avr:35", FALSE, & arch_info_struct[6]),
 122
 123   /* Enhanced, <= 8K.  */
 124   N (16, bfd_mach_avr4, "avr:4", FALSE, & arch_info_struct[7]),
 125
 126   /* Enhanced, > 8K, <= 64K.  */
 127   /* TODO:  addr_bits should be 16, but set to 22 for some following
 128      version of GCC (from 4.3) for backward compatibility.  */
 129   N (22, bfd_mach_avr5, "avr:5", FALSE, & arch_info_struct[8]),
 130
 131   /* Enhanced, == 128K.  */
 132   N (22, bfd_mach_avr51, "avr:51", FALSE, & arch_info_struct[9]),
 133
 134   /* 3-Byte PC.  */
 135   N (22, bfd_mach_avr6, "avr:6", FALSE, NULL)
 136 };
 137
 138 const bfd_arch_info_type bfd_avr_arch =
 139   N (16, bfd_mach_avr2, "avr", TRUE, & arch_info_struct[0]);