1/* BFD library support routines for the AVR architecture.
2   Copyright 1999, 2000, 2002 Free Software Foundation, Inc.
3   Contributed by Denis Chertykov <denisc@overta.ru>
4
5This file is part of BFD, the Binary File Descriptor library.
6
7This program is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2 of the License, or
10(at your option) any later version.
11
12This program is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with this program; if not, write to the Free Software
19Foundation, 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
25static const bfd_arch_info_type *compatible
26  PARAMS ((const bfd_arch_info_type *, const bfd_arch_info_type *));
27
28#define N(addr_bits, machine, print, default, next)		\
29{								\
30  8,				/* 8 bits in a word */		\
31  addr_bits,			/* bits in an address */	\
32  8,				/* 8 bits in a byte */		\
33  bfd_arch_avr,							\
34  machine,			/* machine */			\
35  "avr",			/* arch_name  */		\
36  print,			/* printable name */		\
37  1,				/* section align power */	\
38  default,			/* the default machine */	\
39  compatible,							\
40  bfd_default_scan,						\
41  next								\
42}
43
44static const bfd_arch_info_type arch_info_struct[] =
45{
46  /* AT90S1200, ATtiny1x, ATtiny28 */
47  N (16, bfd_mach_avr1, "avr:1", FALSE, & arch_info_struct[1]),
48
49  /* AT90S2xxx, AT90S4xxx, AT90S8xxx, ATtiny22 */
50  N (16, bfd_mach_avr2, "avr:2", FALSE, & arch_info_struct[2]),
51
52  /* ATmega103, ATmega603 */
53  N (22, bfd_mach_avr3, "avr:3", FALSE, & arch_info_struct[3]),
54
55  /* ATmega83, ATmega85 */
56  N (16, bfd_mach_avr4, "avr:4", FALSE, & arch_info_struct[4]),
57
58  /* ATmega161, ATmega163, ATmega32, AT94K */
59  N (22, bfd_mach_avr5, "avr:5", FALSE, NULL)
60};
61
62const bfd_arch_info_type bfd_avr_arch =
63  N (16, bfd_mach_avr2, "avr", TRUE, & arch_info_struct[0]);
64
65/* This routine is provided two arch_infos and works out which AVR
66   machine which would be compatible with both and returns a pointer
67   to its info structure.  */
68
69static const bfd_arch_info_type *
70compatible (a,b)
71     const bfd_arch_info_type * a;
72     const bfd_arch_info_type * b;
73{
74  /* If a & b are for different architectures we can do nothing.  */
75  if (a->arch != b->arch)
76    return NULL;
77
78  /* Special case for ATmega[16]03 (avr:3) and ATmega83 (avr:4).  */
79  if ((a->mach == bfd_mach_avr3 && b->mach == bfd_mach_avr4)
80      || (a->mach == bfd_mach_avr4 && b->mach == bfd_mach_avr3))
81    return NULL;
82
83  /* So far all newer AVR architecture cores are supersets of previous
84     cores.  */
85  if (a->mach <= b->mach)
86    return b;
87
88  if (a->mach >= b->mach)
89    return a;
90
91  /* Never reached!  */
92  return NULL;
93}
94