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