1 /* BFD library support routines for the Renesas / SuperH SH architecture.
2 Copyright (C) 1993-2020 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
sh_get_arch_from_bfd_mach(unsigned long mach)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 /* Machine not found. */
121 BFD_FAIL();
122
123 return SH_ARCH_UNKNOWN_ARCH;
124 }
125
126
127 /* Convert a BFD mach number into a set of opcodes arch flags
128 describing all the compatible architectures (i.e. arch_up)
129 using the table above. */
130
131 unsigned int
sh_get_arch_up_from_bfd_mach(unsigned long mach)132 sh_get_arch_up_from_bfd_mach (unsigned long mach)
133 {
134 int i = 0;
135
136 while (bfd_to_arch_table[i].bfd_mach != 0)
137 if (bfd_to_arch_table[i].bfd_mach == mach)
138 return bfd_to_arch_table[i].arch_up;
139 else
140 i++;
141
142 /* Machine not found. */
143 BFD_FAIL();
144
145 return SH_ARCH_UNKNOWN_ARCH;
146 }
147
148
149 /* Convert an arbitary arch_set - not necessarily corresponding
150 directly to anything in the table above - to the most generic
151 architecture which supports all the required features, and
152 return the corresponding BFD mach. */
153
154 unsigned long
sh_get_bfd_mach_from_arch_set(unsigned int arch_set)155 sh_get_bfd_mach_from_arch_set (unsigned int arch_set)
156 {
157 unsigned long result = 0;
158 unsigned int best = ~arch_set;
159 unsigned int co_mask = ~0;
160 int i = 0;
161
162 /* If arch_set permits variants with no coprocessor then do not allow
163 the other irrelevant co-processor bits to influence the choice:
164 e.g. if dsp is disallowed by arch_set, then the algorithm would
165 prefer fpu variants over nofpu variants because they also disallow
166 dsp - even though the nofpu would be the most correct choice.
167 This assumes that EVERY fpu/dsp variant has a no-coprocessor
168 counter-part, or their non-fpu/dsp instructions do not have the
169 no co-processor bit set. */
170 if (arch_set & arch_sh_no_co)
171 co_mask = ~(arch_sh_sp_fpu | arch_sh_dp_fpu | arch_sh_has_dsp);
172
173 while (bfd_to_arch_table[i].bfd_mach != 0)
174 {
175 unsigned int try = bfd_to_arch_table[i].arch_up & co_mask;
176
177 /* Conceptually: Find the architecture with the least number
178 of extra features or, if they have the same number, then
179 the greatest number of required features. Disregard
180 architectures where the required features alone do
181 not describe a valid architecture. */
182 if (((try & ~arch_set) < (best & ~arch_set)
183 || ((try & ~arch_set) == (best & ~arch_set)
184 && (~try & arch_set) < (~best & arch_set)))
185 && SH_MERGE_ARCH_SET_VALID (try, arch_set))
186 {
187 result = bfd_to_arch_table[i].bfd_mach;
188 best = try;
189 }
190
191 i++;
192 }
193
194 /* This might happen if a new variant is added to sh-opc.h
195 but no corresponding entry is added to the table above. */
196 BFD_ASSERT (result != 0);
197
198 return result;
199 }
200