| /* BFD backend for RISC-V |
| Copyright (C) 2011-2020 Free Software Foundation, Inc. |
| |
| Contributed by Andrew Waterman (andrew@sifive.com). |
| Based on MIPS target. |
| |
| This file is part of BFD, the Binary File Descriptor library. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; see the file COPYING3. If not, |
| see <http://www.gnu.org/licenses/>. */ |
| |
| #include "sysdep.h" |
| #include "bfd.h" |
| #include "libbfd.h" |
| #include "elfxx-riscv.h" |
| |
| /* Record the priv spec version string and the corresponding class. */ |
| |
| struct priv_spec_t |
| { |
| const char *name; |
| enum riscv_priv_spec_class class; |
| }; |
| |
| /* List for all supported privilege versions. */ |
| |
| static const struct priv_spec_t priv_specs[] = |
| { |
| {"1.9.1", PRIV_SPEC_CLASS_1P9P1}, |
| {"1.10", PRIV_SPEC_CLASS_1P10}, |
| {"1.11", PRIV_SPEC_CLASS_1P11}, |
| |
| /* Terminate the list. */ |
| {NULL, 0} |
| }; |
| |
| /* Get the corresponding CSR version class by giving a privilege |
| version string. */ |
| |
| int |
| riscv_get_priv_spec_class (const char *s, |
| enum riscv_priv_spec_class *class) |
| { |
| const struct priv_spec_t *version; |
| |
| if (s == NULL) |
| return 0; |
| |
| for (version = &priv_specs[0]; version->name != NULL; ++version) |
| if (strcmp (version->name, s) == 0) |
| { |
| *class = version->class; |
| return 1; |
| } |
| |
| /* Can not find the supported privilege version. */ |
| return 0; |
| } |
| |
| /* Get the corresponding CSR version class by giving privilege |
| version numbers. It is usually used to convert the priv |
| attribute numbers into the corresponding class. */ |
| |
| int |
| riscv_get_priv_spec_class_from_numbers (unsigned int major, |
| unsigned int minor, |
| unsigned int revision, |
| enum riscv_priv_spec_class *class) |
| { |
| char buf[36]; |
| |
| if (major == 0 && minor == 0 && revision == 0) |
| { |
| *class = PRIV_SPEC_CLASS_NONE; |
| return 1; |
| } |
| |
| if (revision != 0) |
| snprintf (buf, sizeof (buf), "%u.%u.%u", major, minor, revision); |
| else |
| snprintf (buf, sizeof (buf), "%u.%u", major, minor); |
| |
| return riscv_get_priv_spec_class (buf, class); |
| } |
| |
| /* Get the corresponding privilege version string by giving a CSR |
| version class. */ |
| |
| const char * |
| riscv_get_priv_spec_name (enum riscv_priv_spec_class class) |
| { |
| /* The first enum is PRIV_SPEC_CLASS_NONE. */ |
| return priv_specs[class - 1].name; |
| } |
| |
| /* This routine is provided two arch_infos and returns an arch_info |
| that is compatible with both, or NULL if none exists. */ |
| |
| static const bfd_arch_info_type * |
| riscv_compatible (const bfd_arch_info_type *a, const bfd_arch_info_type *b) |
| { |
| if (a->arch != b->arch) |
| return NULL; |
| |
| /* Machine compatibility is checked in |
| _bfd_riscv_elf_merge_private_bfd_data. */ |
| |
| return a; |
| } |
| |
| /* Return TRUE if STRING matches the architecture described by INFO. */ |
| |
| static bfd_boolean |
| riscv_scan (const struct bfd_arch_info *info, const char *string) |
| { |
| if (bfd_default_scan (info, string)) |
| return TRUE; |
| |
| /* The incoming STRING might take the form of riscv:rvXXzzz, where XX is |
| 32 or 64, and zzz are one or more extension characters. As we |
| currently only have 3 architectures defined, 'riscv', 'riscv:rv32', |
| and 'riscv:rv64', we would like to ignore the zzz for the purpose of |
| matching here. |
| |
| However, we don't want the default 'riscv' to match over a more |
| specific 'riscv:rv32' or 'riscv:rv64', so in the case of the default |
| architecture (with the shorter 'riscv' name) we don't allow any |
| special matching, but for the 'riscv:rvXX' cases, we allow a match |
| with any additional trailing characters being ignored. */ |
| if (!info->the_default |
| && strncasecmp (string, info->printable_name, |
| strlen (info->printable_name)) == 0) |
| return TRUE; |
| |
| return FALSE; |
| } |
| |
| #define N(BITS, NUMBER, PRINT, DEFAULT, NEXT) \ |
| { \ |
| BITS, /* Bits in a word. */ \ |
| BITS, /* Bits in an address. */ \ |
| 8, /* Bits in a byte. */ \ |
| bfd_arch_riscv, \ |
| NUMBER, \ |
| "riscv", \ |
| PRINT, \ |
| 3, \ |
| DEFAULT, \ |
| riscv_compatible, \ |
| riscv_scan, \ |
| bfd_arch_default_fill, \ |
| NEXT, \ |
| 0 /* Maximum offset of a reloc from the start of an insn. */\ |
| } |
| |
| /* This enum must be kept in the same order as arch_info_struct. */ |
| enum |
| { |
| I_riscv64, |
| I_riscv32 |
| }; |
| |
| #define NN(index) (&arch_info_struct[(index) + 1]) |
| |
| /* This array must be kept in the same order as the anonymous enum above, |
| and each entry except the last should end with NN (my enum value). */ |
| static const bfd_arch_info_type arch_info_struct[] = |
| { |
| N (64, bfd_mach_riscv64, "riscv:rv64", FALSE, NN (I_riscv64)), |
| N (32, bfd_mach_riscv32, "riscv:rv32", FALSE, NULL) |
| }; |
| |
| /* The default architecture is riscv:rv64. */ |
| |
| const bfd_arch_info_type bfd_riscv_arch = |
| N (64, 0, "riscv", TRUE, &arch_info_struct[0]); |