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
31static const bfd_arch_info_type *
32compatible (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
102static 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
139const bfd_arch_info_type bfd_avr_arch =
140  N (16, bfd_mach_avr2, "avr", TRUE, & arch_info_struct[0]);
141