bfd/cpu-avr.c

   1 /* BFD library support routines for the AVR architecture.
   2    Copyright 1999, 2000, 2002, 2005, 2006, 2007, 2008
   3    Free Software Foundation, Inc.
   4    Contributed by Denis Chertykov <denisc@overta.ru>
   5
   6    This file is part of BFD, the Binary File Descriptor library.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  21    MA 02110-1301, USA.  */
  22
  23 #include "sysdep.h"
  24 #include "bfd.h"
  25 #include "libbfd.h"
  26
  27 /* This routine is provided two arch_infos and works out which AVR
  28    machine which would be compatible with both and returns a pointer
  29    to its info structure.  */
  30
  31 static const bfd_arch_info_type *
  32 compatible (const bfd_arch_info_type * a,
  33             const bfd_arch_info_type * b)
  34 {
  35   /* If a & b are for different architectures we can do nothing.  */
  36   if (a->arch != b->arch)
  37     return NULL;
  38
  39   if (a->mach == b->mach)
  40     return a;
  41
  42   /* avr-6 is compatible only with itself as its call convention is not
  43      compatible with other avr (the mcu saves the return address on 3 bytes
  44      instead of 2).  */
  45   if (a->mach == bfd_mach_avr6 || b->mach == bfd_mach_avr6)
  46     return NULL;
  47
  48   if (a->mach < bfd_mach_avr6 && b->mach < bfd_mach_avr6)
  49     {
  50       /* Special case for ATmega[16]03 (avr:3) and ATmega83 (avr:4).  */
  51       if ((a->mach == bfd_mach_avr3 && b->mach == bfd_mach_avr4)
  52          || (a->mach == bfd_mach_avr4 && b->mach == bfd_mach_avr3))
  53        return NULL;
  54
  55       if (a->mach <= b->mach)
  56        return b;
  57
  58       if (a->mach >= b->mach)
  59        return a;
  60     }
  61
  62   if (a->mach == bfd_mach_avr2 && b->mach == bfd_mach_avr25)
  63     return a;
  64   if (a->mach == bfd_mach_avr25 && b->mach == bfd_mach_avr2)
  65     return b;
  66
  67   if (a->mach == bfd_mach_avr3 && b->mach == bfd_mach_avr31)
  68     return a;
  69   if (a->mach == bfd_mach_avr31 && b->mach == bfd_mach_avr3)
  70     return b;
  71
  72   if (a->mach == bfd_mach_avr3 && b->mach == bfd_mach_avr35)
  73     return a;
  74   if (a->mach == bfd_mach_avr35 && b->mach == bfd_mach_avr3)
  75     return b;
  76
  77   if (a->mach == bfd_mach_avr5 && b->mach == bfd_mach_avr51)
  78     return a;
  79   if (a->mach == bfd_mach_avr51 && b->mach == bfd_mach_avr5)
  80     return b;
  81
  82
  83   return NULL;
  84 }
  85
  86 #define N(addr_bits, machine, print, default, next)             \
  87 {                                                               \
  88   8,                            /* 8 bits in a word.  */        \
  89   addr_bits,                    /* bits in an address.  */      \
  90   8,                            /* 8 bits in a byte.  */        \
  91   bfd_arch_avr,                                                 \
  92   machine,                      /* Machine number.  */          \
  93   "avr",                        /* Architecture name.   */      \
  94   print,                        /* Printable name.  */          \
  95   1,                            /* Section align power.  */     \
  96   default,                      /* Is this the default ?  */    \
  97   compatible,                                                   \
  98   bfd_default_scan,                                             \
  99   next                                                          \
 100 }
 101
 102 static const bfd_arch_info_type arch_info_struct[] =
 103 {
 104   /* Assembler only.  */
 105   N (16, bfd_mach_avr1, "avr:1", FALSE, & arch_info_struct[1]),
 106
 107   /* Classic, <= 8K.  */
 108   N (16, bfd_mach_avr2, "avr:2", FALSE, & arch_info_struct[2]),
 109
 110   /* Classic + MOVW, <= 8K.  */
 111   N (16, bfd_mach_avr25, "avr:25", FALSE, & arch_info_struct[3]),
 112
 113   /* Classic, > 8K, <= 64K.  */
 114   /* TODO:  addr_bits should be 16, but set to 22 for some following
 115      version of GCC (from 4.3) for backward compatibility.  */
 116   N (22, bfd_mach_avr3, "avr:3", FALSE, & arch_info_struct[4]),
 117
 118   /* Classic, == 128K.  */
 119   N (22, bfd_mach_avr31, "avr:31", FALSE, & arch_info_struct[5]),
 120
 121   /* Classic + MOVW + JMP/CALL, > 8K, <= 64K. */
 122   N (16, bfd_mach_avr35, "avr:35", FALSE, & arch_info_struct[6]),
 123
 124   /* Enhanced, <= 8K.  */
 125   N (16, bfd_mach_avr4, "avr:4", FALSE, & arch_info_struct[7]),
 126
 127   /* Enhanced, > 8K, <= 64K.  */
 128   /* TODO:  addr_bits should be 16, but set to 22 for some following
 129      version of GCC (from 4.3) for backward compatibility.  */
 130   N (22, bfd_mach_avr5, "avr:5", FALSE, & arch_info_struct[8]),
 131
 132   /* Enhanced, == 128K.  */
 133   N (22, bfd_mach_avr51, "avr:51", FALSE, & arch_info_struct[9]),
 134
 135   /* 3-Byte PC.  */
 136   N (22, bfd_mach_avr6, "avr:6", FALSE, NULL)
 137 };
 138
 139 const bfd_arch_info_type bfd_avr_arch =
 140   N (16, bfd_mach_avr2, "avr", TRUE, & arch_info_struct[0]);