1 /* BFD library support routines for the Renesas / SuperH SH architecture.
2 Copyright (C) 1993-2023 Free Software Foundation, Inc.
3 Hacked by Steve Chamberlain of Cygnus Support.
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 #include "../opcodes/sh-opc.h"
26
27
28 #define N(NUMBER, PRINT, DEFAULT, NEXT) \
29 { \
30 32, /* Bits in a word. */ \
31 32, /* Bits in an address. */ \
32 8, /* Bits in a byte. */ \
33 bfd_arch_sh, \
34 NUMBER, \
35 "sh", \
36 PRINT, \
37 1, /* Section alignment power. */ \
38 DEFAULT, \
39 bfd_default_compatible, \
40 bfd_default_scan, \
41 bfd_arch_default_fill, \
42 NEXT, \
43 0 /* Maximum offset of a reloc from the start of an insn. */ \
44 }
45
46 static const bfd_arch_info_type arch_info_struct[] =
47 {
48 N (bfd_mach_sh2, "sh2", false, arch_info_struct + 1),
49 N (bfd_mach_sh2e, "sh2e", false, arch_info_struct + 2),
50 N (bfd_mach_sh_dsp, "sh-dsp", false, arch_info_struct + 3),
51 N (bfd_mach_sh3, "sh3", false, arch_info_struct + 4),
52 N (bfd_mach_sh3_nommu, "sh3-nommu", false, arch_info_struct + 5),
53 N (bfd_mach_sh3_dsp, "sh3-dsp", false, arch_info_struct + 6),
54 N (bfd_mach_sh3e, "sh3e", false, arch_info_struct + 7),
55 N (bfd_mach_sh4, "sh4", false, arch_info_struct + 8),
56 N (bfd_mach_sh4a, "sh4a", false, arch_info_struct + 9),
57 N (bfd_mach_sh4al_dsp, "sh4al-dsp", false, arch_info_struct + 10),
58 N (bfd_mach_sh4_nofpu, "sh4-nofpu", false, arch_info_struct + 11),
59 N (bfd_mach_sh4_nommu_nofpu, "sh4-nommu-nofpu", false, arch_info_struct + 12),
60 N (bfd_mach_sh4a_nofpu, "sh4a-nofpu", false, arch_info_struct + 13),
61 N (bfd_mach_sh2a, "sh2a", false, arch_info_struct + 14),
62 N (bfd_mach_sh2a_nofpu, "sh2a-nofpu", false, arch_info_struct + 15),
63 N (bfd_mach_sh2a_nofpu_or_sh4_nommu_nofpu, "sh2a-nofpu-or-sh4-nommu-nofpu", false, arch_info_struct + 16),
64 N (bfd_mach_sh2a_nofpu_or_sh3_nommu, "sh2a-nofpu-or-sh3-nommu", false, arch_info_struct + 17),
65 N (bfd_mach_sh2a_or_sh4, "sh2a-or-sh4", false, arch_info_struct + 18),
66 N (bfd_mach_sh2a_or_sh3e, "sh2a-or-sh3e", false, NULL)
67 };
68
69 const bfd_arch_info_type bfd_sh_arch =
70 N (bfd_mach_sh, "sh", true, arch_info_struct + 0);
71
72 /* This table defines the mappings from the BFD internal numbering
73 system to the opcodes internal flags system.
74 It is used by the functions defined below.
75 The prototypes for these SH specific functions are found in
76 sh-opc.h . */
77
78 static struct { unsigned long bfd_mach, arch, arch_up; } bfd_to_arch_table[] =
79 {
80 { bfd_mach_sh, arch_sh1, arch_sh_up },
81 { bfd_mach_sh2, arch_sh2, arch_sh2_up },
82 { bfd_mach_sh2e, arch_sh2e, arch_sh2e_up },
83 { bfd_mach_sh_dsp, arch_sh_dsp, arch_sh_dsp_up },
84 { bfd_mach_sh2a, arch_sh2a, arch_sh2a_up },
85 { bfd_mach_sh2a_nofpu, arch_sh2a_nofpu, arch_sh2a_nofpu_up },
86
87 { bfd_mach_sh2a_nofpu_or_sh4_nommu_nofpu, arch_sh2a_nofpu_or_sh4_nommu_nofpu, arch_sh2a_nofpu_or_sh4_nommu_nofpu_up },
88 { bfd_mach_sh2a_nofpu_or_sh3_nommu, arch_sh2a_nofpu_or_sh3_nommu, arch_sh2a_nofpu_or_sh3_nommu_up },
89 { bfd_mach_sh2a_or_sh4, arch_sh2a_or_sh4, arch_sh2a_or_sh4_up },
90 { bfd_mach_sh2a_or_sh3e, arch_sh2a_or_sh3e, arch_sh2a_or_sh3e_up },
91
92 { bfd_mach_sh3, arch_sh3, arch_sh3_up },
93 { bfd_mach_sh3_nommu, arch_sh3_nommu, arch_sh3_nommu_up },
94 { bfd_mach_sh3_dsp, arch_sh3_dsp, arch_sh3_dsp_up },
95 { bfd_mach_sh3e, arch_sh3e, arch_sh3e_up },
96 { bfd_mach_sh4, arch_sh4, arch_sh4_up },
97 { bfd_mach_sh4a, arch_sh4a, arch_sh4a_up },
98 { bfd_mach_sh4al_dsp, arch_sh4al_dsp, arch_sh4al_dsp_up },
99 { bfd_mach_sh4_nofpu, arch_sh4_nofpu, arch_sh4_nofpu_up },
100 { bfd_mach_sh4_nommu_nofpu, arch_sh4_nommu_nofpu, arch_sh4_nommu_nofpu_up },
101 { bfd_mach_sh4a_nofpu, arch_sh4a_nofpu, arch_sh4a_nofpu_up },
102 { 0, 0, 0 } /* Terminator. */
103 };
104
105
106 /* Convert a BFD mach number into the right opcodes arch flags
107 using the table above. */
108
109 unsigned int
110 sh_get_arch_from_bfd_mach (unsigned long mach)
111 {
112 int i = 0;
113
114 while (bfd_to_arch_table[i].bfd_mach != 0)
115 if (bfd_to_arch_table[i].bfd_mach == mach)
116 return bfd_to_arch_table[i].arch;
117 else
118 i++;
119
120 return SH_ARCH_UNKNOWN_ARCH;
121 }
122
123
124 /* Convert a BFD mach number into a set of opcodes arch flags
125 describing all the compatible architectures (i.e. arch_up)
126 using the table above. */
127
128 unsigned int
129 sh_get_arch_up_from_bfd_mach (unsigned long mach)
130 {
131 int i = 0;
132
133 while (bfd_to_arch_table[i].bfd_mach != 0)
134 if (bfd_to_arch_table[i].bfd_mach == mach)
135 return bfd_to_arch_table[i].arch_up;
136 else
137 i++;
138
139 return SH_ARCH_UNKNOWN_ARCH;
140 }
141
142
143 /* Convert an arbitary arch_set - not necessarily corresponding
144 directly to anything in the table above - to the most generic
145 architecture which supports all the required features, and
146 return the corresponding BFD mach. */
147
148 unsigned long
149 sh_get_bfd_mach_from_arch_set (unsigned int arch_set)
150 {
151 unsigned long result = 0;
152 unsigned int best = ~arch_set;
153 unsigned int co_mask = ~0;
154 int i = 0;
155
156 /* If arch_set permits variants with no coprocessor then do not allow
157 the other irrelevant co-processor bits to influence the choice:
158 e.g. if dsp is disallowed by arch_set, then the algorithm would
159 prefer fpu variants over nofpu variants because they also disallow
160 dsp - even though the nofpu would be the most correct choice.
161 This assumes that EVERY fpu/dsp variant has a no-coprocessor
162 counter-part, or their non-fpu/dsp instructions do not have the
163 no co-processor bit set. */
164 if (arch_set & arch_sh_no_co)
165 co_mask = ~(arch_sh_sp_fpu | arch_sh_dp_fpu | arch_sh_has_dsp);
166
167 while (bfd_to_arch_table[i].bfd_mach != 0)
168 {
169 unsigned int try = bfd_to_arch_table[i].arch_up & co_mask;
170
171 /* Conceptually: Find the architecture with the least number
172 of extra features or, if they have the same number, then
173 the greatest number of required features. Disregard
174 architectures where the required features alone do
175 not describe a valid architecture. */
176 if (((try & ~arch_set) < (best & ~arch_set)
177 || ((try & ~arch_set) == (best & ~arch_set)
178 && (~try & arch_set) < (~best & arch_set)))
179 && SH_MERGE_ARCH_SET_VALID (try, arch_set))
180 {
181 result = bfd_to_arch_table[i].bfd_mach;
182 best = try;
183 }
184
185 i++;
186 }
187
188 /* This might happen if a new variant is added to sh-opc.h
189 but no corresponding entry is added to the table above. */
190 BFD_ASSERT (result != 0);
191
192 return result;
193 }