1/* BFD backend for RISC-V
2   Copyright (C) 2011-2022 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
28static const bfd_arch_info_type *
29riscv_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
42static bool
43riscv_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.  */
86enum
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).  */
96static 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.  */
103const 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.  */
107const 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.  */
115const 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
127void
128riscv_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
147bool
148riscv_elf_is_mapping_symbols (const char *name)
149{
150  return (!strncmp (name, "$d", 2)
151	  || !strncmp (name, "$x", 2));
152}
153