1 /* BFD backend for RISC-V
2 Copyright (C) 2011-2023 Free Software Foundation, Inc.
3
4 Contributed by Andrew Waterman (andrew@sifive.com).
5 Based on MIPS target.
6
7 This file is part of BFD, the Binary File Descriptor library.
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program; see the file COPYING3. If not,
21 see <http://www.gnu.org/licenses/>. */
22
23 #include "sysdep.h"
24 #include "bfd.h"
25 #include "libbfd.h"
26 #include "cpu-riscv.h"
27
28 static const bfd_arch_info_type *
29 riscv_compatible (const bfd_arch_info_type *a, const bfd_arch_info_type *b)
30 {
31 if (a->arch != b->arch)
32 return NULL;
33
34 /* Machine compatibility is checked in
35 _bfd_riscv_elf_merge_private_bfd_data. */
36
37 return a;
38 }
39
40 /* Return TRUE if STRING matches the architecture described by INFO. */
41
42 static bool
43 riscv_scan (const struct bfd_arch_info *info, const char *string)
44 {
45 if (bfd_default_scan (info, string))
46 return true;
47
48 /* The incoming STRING might take the form of riscv:rvXXzzz, where XX is
49 32 or 64, and zzz are one or more extension characters. As we
50 currently only have 3 architectures defined, 'riscv', 'riscv:rv32',
51 and 'riscv:rv64', we would like to ignore the zzz for the purpose of
52 matching here.
53
54 However, we don't want the default 'riscv' to match over a more
55 specific 'riscv:rv32' or 'riscv:rv64', so in the case of the default
56 architecture (with the shorter 'riscv' name) we don't allow any
57 special matching, but for the 'riscv:rvXX' cases, we allow a match
58 with any additional trailing characters being ignored. */
59 if (!info->the_default
60 && strncasecmp (string, info->printable_name,
61 strlen (info->printable_name)) == 0)
62 return true;
63
64 return false;
65 }
66
67 #define N(BITS, NUMBER, PRINT, DEFAULT, NEXT) \
68 { \
69 BITS, /* Bits in a word. */ \
70 BITS, /* Bits in an address. */ \
71 8, /* Bits in a byte. */ \
72 bfd_arch_riscv, \
73 NUMBER, \
74 "riscv", \
75 PRINT, \
76 3, \
77 DEFAULT, \
78 riscv_compatible, \
79 riscv_scan, \
80 bfd_arch_default_fill, \
81 NEXT, \
82 0 /* Maximum offset of a reloc from the start of an insn. */\
83 }
84
85 /* This enum must be kept in the same order as arch_info_struct. */
86 enum
87 {
88 I_riscv64,
89 I_riscv32
90 };
91
92 #define NN(index) (&arch_info_struct[(index) + 1])
93
94 /* This array must be kept in the same order as the anonymous enum above,
95 and each entry except the last should end with NN (my enum value). */
96 static const bfd_arch_info_type arch_info_struct[] =
97 {
98 N (64, bfd_mach_riscv64, "riscv:rv64", false, NN (I_riscv64)),
99 N (32, bfd_mach_riscv32, "riscv:rv32", false, NULL)
100 };
101
102 /* The default architecture is riscv:rv64. */
103 const bfd_arch_info_type bfd_riscv_arch =
104 N (64, 0, "riscv", true, &arch_info_struct[0]);
105
106 /* List for all supported ISA spec versions. */
107 const struct riscv_spec riscv_isa_specs[] =
108 {
109 {"2.2", ISA_SPEC_CLASS_2P2},
110 {"20190608", ISA_SPEC_CLASS_20190608},
111 {"20191213", ISA_SPEC_CLASS_20191213},
112 };
113
114 /* List for all supported privileged spec versions. */
115 const struct riscv_spec riscv_priv_specs[] =
116 {
117 {"1.9.1", PRIV_SPEC_CLASS_1P9P1},
118 {"1.10", PRIV_SPEC_CLASS_1P10},
119 {"1.11", PRIV_SPEC_CLASS_1P11},
120 {"1.12", PRIV_SPEC_CLASS_1P12},
121 };
122
123 /* Get the corresponding CSR version class by giving privilege
124 version numbers. It is usually used to convert the priv
125 attribute numbers into the corresponding class. */
126
127 void
128 riscv_get_priv_spec_class_from_numbers (unsigned int major,
129 unsigned int minor,
130 unsigned int revision,
131 enum riscv_spec_class *class)
132 {
133 enum riscv_spec_class class_t = *class;
134 char buf[36];
135
136 if (revision != 0)
137 snprintf (buf, sizeof (buf), "%u.%u.%u", major, minor, revision);
138 else
139 snprintf (buf, sizeof (buf), "%u.%u", major, minor);
140
141 RISCV_GET_PRIV_SPEC_CLASS (buf, class_t);
142 *class = class_t;
143 }
144
145 /* Define mapping symbols for riscv. */
146
147 bool
148 riscv_elf_is_mapping_symbols (const char *name)
149 {
150 return (!strncmp (name, "$d", 2)
151 || !strncmp (name, "$x", 2));
152 }