1 /* BFD library support routines for the AVR architecture.
2 Copyright (C) 1999-2023 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 if (a->mach == bfd_mach_avr3 && b->mach == bfd_mach_avr35)
71 return a;
72 if (a->mach == bfd_mach_avr35 && b->mach == bfd_mach_avr3)
73 return b;
74
75 if (a->mach == bfd_mach_avr5 && b->mach == bfd_mach_avr51)
76 return a;
77 if (a->mach == bfd_mach_avr51 && b->mach == bfd_mach_avr5)
78 return b;
79
80 return NULL;
81 }
82
83 #define N(addr_bits, machine, print, default, next) \
84 { \
85 8, /* Bits in a word. */ \
86 addr_bits, /* Bits in an address. */ \
87 8, /* Bits in a byte. */ \
88 bfd_arch_avr, \
89 machine, /* Machine number. */ \
90 "avr", /* Architecture name. */ \
91 print, /* Printable name. */ \
92 1, /* Section align power. */ \
93 default, /* Is this the default ? */ \
94 compatible, \
95 bfd_default_scan, \
96 bfd_arch_default_fill, \
97 next, \
98 0 /* Maximum offset of a reloc from the start of an insn. */ \
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, & arch_info_struct[10]),
136
137 /* Tiny core (AVR Tiny). */
138 N (16, bfd_mach_avrtiny, "avr:100", false, & arch_info_struct[11]),
139
140 /* Xmega 1. */
141 N (24, bfd_mach_avrxmega1, "avr:101", false, & arch_info_struct[12]),
142
143 /* Xmega 2. */
144 N (24, bfd_mach_avrxmega2, "avr:102", false, & arch_info_struct[13]),
145
146 /* Xmega 3. */
147 N (24, bfd_mach_avrxmega3, "avr:103", false, & arch_info_struct[14]),
148
149 /* Xmega 4. */
150 N (24, bfd_mach_avrxmega4, "avr:104", false, & arch_info_struct[15]),
151
152 /* Xmega 5. */
153 N (24, bfd_mach_avrxmega5, "avr:105", false, & arch_info_struct[16]),
154
155 /* Xmega 6. */
156 N (24, bfd_mach_avrxmega6, "avr:106", false, & arch_info_struct[17]),
157
158 /* Xmega 7. */
159 N (24, bfd_mach_avrxmega7, "avr:107", false, NULL)
160
161 };
162
163 const bfd_arch_info_type bfd_avr_arch =
164 N (16, bfd_mach_avr2, "avr", true, & arch_info_struct[0]);