1 /* BFD backend for RISC-V 2 Copyright (C) 2011-2020 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 "elfxx-riscv.h" 27 28 /* Record the priv spec version string and the corresponding class. */ 29 30 struct priv_spec_t 31 { 32 const char *name; 33 enum riscv_priv_spec_class class; 34 }; 35 36 /* List for all supported privilege versions. */ 37 38 static const struct priv_spec_t priv_specs[] = 39 { 40 {"1.9.1", PRIV_SPEC_CLASS_1P9P1}, 41 {"1.10", PRIV_SPEC_CLASS_1P10}, 42 {"1.11", PRIV_SPEC_CLASS_1P11}, 43 44 /* Terminate the list. */ 45 {NULL, 0} 46 }; 47 48 /* Get the corresponding CSR version class by giving a privilege 49 version string. */ 50 51 int 52 riscv_get_priv_spec_class (const char *s, 53 enum riscv_priv_spec_class *class) 54 { 55 const struct priv_spec_t *version; 56 57 if (s == NULL) 58 return 0; 59 60 for (version = &priv_specs[0]; version->name != NULL; ++version) 61 if (strcmp (version->name, s) == 0) 62 { 63 *class = version->class; 64 return 1; 65 } 66 67 /* Can not find the supported privilege version. */ 68 return 0; 69 } 70 71 /* Get the corresponding CSR version class by giving privilege 72 version numbers. It is usually used to convert the priv 73 attribute numbers into the corresponding class. */ 74 75 int 76 riscv_get_priv_spec_class_from_numbers (unsigned int major, 77 unsigned int minor, 78 unsigned int revision, 79 enum riscv_priv_spec_class *class) 80 { 81 char buf[36]; 82 83 if (major == 0 && minor == 0 && revision == 0) 84 { 85 *class = PRIV_SPEC_CLASS_NONE; 86 return 1; 87 } 88 89 if (revision != 0) 90 snprintf (buf, sizeof (buf), "%u.%u.%u", major, minor, revision); 91 else 92 snprintf (buf, sizeof (buf), "%u.%u", major, minor); 93 94 return riscv_get_priv_spec_class (buf, class); 95 } 96 97 /* Get the corresponding privilege version string by giving a CSR 98 version class. */ 99 100 const char * 101 riscv_get_priv_spec_name (enum riscv_priv_spec_class class) 102 { 103 /* The first enum is PRIV_SPEC_CLASS_NONE. */ 104 return priv_specs[class - 1].name; 105 } 106 107 /* This routine is provided two arch_infos and returns an arch_info 108 that is compatible with both, or NULL if none exists. */ 109 110 static const bfd_arch_info_type * 111 riscv_compatible (const bfd_arch_info_type *a, const bfd_arch_info_type *b) 112 { 113 if (a->arch != b->arch) 114 return NULL; 115 116 /* Machine compatibility is checked in 117 _bfd_riscv_elf_merge_private_bfd_data. */ 118 119 return a; 120 } 121 122 /* Return TRUE if STRING matches the architecture described by INFO. */ 123 124 static bfd_boolean 125 riscv_scan (const struct bfd_arch_info *info, const char *string) 126 { 127 if (bfd_default_scan (info, string)) 128 return TRUE; 129 130 /* The incoming STRING might take the form of riscv:rvXXzzz, where XX is 131 32 or 64, and zzz are one or more extension characters. As we 132 currently only have 3 architectures defined, 'riscv', 'riscv:rv32', 133 and 'riscv:rv64', we would like to ignore the zzz for the purpose of 134 matching here. 135 136 However, we don't want the default 'riscv' to match over a more 137 specific 'riscv:rv32' or 'riscv:rv64', so in the case of the default 138 architecture (with the shorter 'riscv' name) we don't allow any 139 special matching, but for the 'riscv:rvXX' cases, we allow a match 140 with any additional trailing characters being ignored. */ 141 if (!info->the_default 142 && strncasecmp (string, info->printable_name, 143 strlen (info->printable_name)) == 0) 144 return TRUE; 145 146 return FALSE; 147 } 148 149 #define N(BITS, NUMBER, PRINT, DEFAULT, NEXT) \ 150 { \ 151 BITS, /* Bits in a word. */ \ 152 BITS, /* Bits in an address. */ \ 153 8, /* Bits in a byte. */ \ 154 bfd_arch_riscv, \ 155 NUMBER, \ 156 "riscv", \ 157 PRINT, \ 158 3, \ 159 DEFAULT, \ 160 riscv_compatible, \ 161 riscv_scan, \ 162 bfd_arch_default_fill, \ 163 NEXT, \ 164 0 /* Maximum offset of a reloc from the start of an insn. */\ 165 } 166 167 /* This enum must be kept in the same order as arch_info_struct. */ 168 enum 169 { 170 I_riscv64, 171 I_riscv32 172 }; 173 174 #define NN(index) (&arch_info_struct[(index) + 1]) 175 176 /* This array must be kept in the same order as the anonymous enum above, 177 and each entry except the last should end with NN (my enum value). */ 178 static const bfd_arch_info_type arch_info_struct[] = 179 { 180 N (64, bfd_mach_riscv64, "riscv:rv64", FALSE, NN (I_riscv64)), 181 N (32, bfd_mach_riscv32, "riscv:rv32", FALSE, NULL) 182 }; 183 184 /* The default architecture is riscv:rv64. */ 185 186 const bfd_arch_info_type bfd_riscv_arch = 187 N (64, 0, "riscv", TRUE, &arch_info_struct[0]); 188