bfd/cpu-riscv.c

   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
  27 /* This routine is provided two arch_infos and returns an arch_info
  28    that is compatible with both, or NULL if none exists.  */
  29
  30 static const bfd_arch_info_type *
  31 riscv_compatible (const bfd_arch_info_type *a, const bfd_arch_info_type *b)
  32 {
  33   if (a->arch != b->arch)
  34     return NULL;
  35
  36   /* Machine compatibility is checked in
  37      _bfd_riscv_elf_merge_private_bfd_data.  */
  38
  39   return a;
  40 }
  41
  42 /* Return TRUE if STRING matches the architecture described by INFO.  */
  43
  44 static bfd_boolean
  45 riscv_scan (const struct bfd_arch_info *info, const char *string)
  46 {
  47   if (bfd_default_scan (info, string))
  48     return TRUE;
  49
  50   /* The incoming STRING might take the form of riscv:rvXXzzz, where XX is
  51      32 or 64, and zzz are one or more extension characters.  As we
  52      currently only have 3 architectures defined, 'riscv', 'riscv:rv32',
  53      and 'riscv:rv64', we would like to ignore the zzz for the purpose of
  54      matching here.
  55
  56      However, we don't want the default 'riscv' to match over a more
  57      specific 'riscv:rv32' or 'riscv:rv64', so in the case of the default
  58      architecture (with the shorter 'riscv' name) we don't allow any
  59      special matching, but for the 'riscv:rvXX' cases, we allow a match
  60      with any additional trailing characters being ignored.  */
  61   if (!info->the_default
  62       && strncasecmp (string, info->printable_name,
  63                       strlen (info->printable_name)) == 0)
  64     return TRUE;
  65
  66   return FALSE;
  67 }
  68
  69 #define N(BITS, NUMBER, PRINT, DEFAULT, NEXT)                   \
  70   {                                                             \
  71     BITS,      /* Bits in a word.  */                           \
  72     BITS,      /* Bits in an address.  */                       \
  73     8,         /* Bits in a byte.  */                           \
  74     bfd_arch_riscv,                                             \
  75     NUMBER,                                                     \
  76     "riscv",                                                    \
  77     PRINT,                                                      \
  78     3,                                                          \
  79     DEFAULT,                                                    \
  80     riscv_compatible,                                           \
  81     riscv_scan,                                                 \
  82     bfd_arch_default_fill,                                      \
  83     NEXT,                                                       \
  84     0 /* Maximum offset of a reloc from the start of an insn.  */\
  85   }
  86
  87 /* This enum must be kept in the same order as arch_info_struct.  */
  88 enum
  89 {
  90   I_riscv64,
  91   I_riscv32
  92 };
  93
  94 #define NN(index) (&arch_info_struct[(index) + 1])
  95
  96 /* This array must be kept in the same order as the anonymous enum above,
  97    and each entry except the last should end with NN (my enum value).  */
  98 static const bfd_arch_info_type arch_info_struct[] =
  99 {
 100   N (64, bfd_mach_riscv64, "riscv:rv64", FALSE, NN (I_riscv64)),
 101   N (32, bfd_mach_riscv32, "riscv:rv32", FALSE, NULL)
 102 };
 103
 104 /* The default architecture is riscv:rv64.  */
 105
 106 const bfd_arch_info_type bfd_riscv_arch =
 107   N (64, 0, "riscv", TRUE, &arch_info_struct[0]);