bfd/cpu-sh.c

   1 /* BFD library support routines for the Renesas / SuperH SH architecture.
   2    Copyright (C) 1993-2024 Free Software Foundation, Inc.
   3    Hacked by Steve Chamberlain of Cygnus Support.
   4
   5    This file is part of BFD, the Binary File Descriptor library.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  20    MA 02110-1301, USA.  */
  21
  22 #include "sysdep.h"
  23 #include "bfd.h"
  24 #include "libbfd.h"
  25 #include "../opcodes/sh-opc.h"
  26
  27
  28 #define N(NUMBER, PRINT, DEFAULT, NEXT)                 \
  29   {                                                     \
  30     32,     /* Bits in a word.  */                      \
  31     32,     /* Bits in an address.  */                  \
  32     8,      /* Bits in a byte.  */                      \
  33     bfd_arch_sh,                                        \
  34     NUMBER,                                             \
  35     "sh",                                               \
  36     PRINT,                                              \
  37     1,          /* Section alignment power.  */         \
  38     DEFAULT,                                            \
  39     bfd_default_compatible,                             \
  40     bfd_default_scan,                                   \
  41     bfd_arch_default_fill,                              \
  42     NEXT,                                               \
  43     0 /* Maximum offset of a reloc from the start of an insn.  */ \
  44   }
  45
  46 static const bfd_arch_info_type arch_info_struct[] =
  47 {
  48   N (bfd_mach_sh2,          "sh2",       false, arch_info_struct + 1),
  49   N (bfd_mach_sh2e,         "sh2e",      false, arch_info_struct + 2),
  50   N (bfd_mach_sh_dsp,       "sh-dsp",    false, arch_info_struct + 3),
  51   N (bfd_mach_sh3,          "sh3",       false, arch_info_struct + 4),
  52   N (bfd_mach_sh3_nommu,    "sh3-nommu", false, arch_info_struct + 5),
  53   N (bfd_mach_sh3_dsp,      "sh3-dsp",   false, arch_info_struct + 6),
  54   N (bfd_mach_sh3e,         "sh3e",      false, arch_info_struct + 7),
  55   N (bfd_mach_sh4,          "sh4",       false, arch_info_struct + 8),
  56   N (bfd_mach_sh4a,         "sh4a",      false, arch_info_struct + 9),
  57   N (bfd_mach_sh4al_dsp,    "sh4al-dsp", false, arch_info_struct + 10),
  58   N (bfd_mach_sh4_nofpu,    "sh4-nofpu", false, arch_info_struct + 11),
  59   N (bfd_mach_sh4_nommu_nofpu, "sh4-nommu-nofpu", false, arch_info_struct + 12),
  60   N (bfd_mach_sh4a_nofpu,   "sh4a-nofpu", false, arch_info_struct + 13),
  61   N (bfd_mach_sh2a,         "sh2a",       false, arch_info_struct + 14),
  62   N (bfd_mach_sh2a_nofpu,   "sh2a-nofpu", false, arch_info_struct + 15),
  63   N (bfd_mach_sh2a_nofpu_or_sh4_nommu_nofpu, "sh2a-nofpu-or-sh4-nommu-nofpu", false, arch_info_struct + 16),
  64   N (bfd_mach_sh2a_nofpu_or_sh3_nommu, "sh2a-nofpu-or-sh3-nommu", false, arch_info_struct + 17),
  65   N (bfd_mach_sh2a_or_sh4,  "sh2a-or-sh4",  false, arch_info_struct + 18),
  66   N (bfd_mach_sh2a_or_sh3e, "sh2a-or-sh3e", false, NULL)
  67 };
  68
  69 const bfd_arch_info_type bfd_sh_arch =
  70   N (bfd_mach_sh, "sh", true, arch_info_struct + 0);
  71
  72 /* This table defines the mappings from the BFD internal numbering
  73    system to the opcodes internal flags system.
  74    It is used by the functions defined below.
  75    The prototypes for these SH specific functions are found in
  76    sh-opc.h .  */
  77
  78 static struct { unsigned long bfd_mach, arch, arch_up; } bfd_to_arch_table[] =
  79 {
  80   { bfd_mach_sh,              arch_sh1,             arch_sh_up },
  81   { bfd_mach_sh2,             arch_sh2,             arch_sh2_up },
  82   { bfd_mach_sh2e,            arch_sh2e,            arch_sh2e_up },
  83   { bfd_mach_sh_dsp,          arch_sh_dsp,          arch_sh_dsp_up },
  84   { bfd_mach_sh2a,            arch_sh2a,            arch_sh2a_up },
  85   { bfd_mach_sh2a_nofpu,      arch_sh2a_nofpu,      arch_sh2a_nofpu_up },
  86
  87   { bfd_mach_sh2a_nofpu_or_sh4_nommu_nofpu,         arch_sh2a_nofpu_or_sh4_nommu_nofpu,   arch_sh2a_nofpu_or_sh4_nommu_nofpu_up },
  88   { bfd_mach_sh2a_nofpu_or_sh3_nommu,               arch_sh2a_nofpu_or_sh3_nommu,         arch_sh2a_nofpu_or_sh3_nommu_up },
  89   { bfd_mach_sh2a_or_sh4,     arch_sh2a_or_sh4,     arch_sh2a_or_sh4_up },
  90   { bfd_mach_sh2a_or_sh3e,    arch_sh2a_or_sh3e,    arch_sh2a_or_sh3e_up },
  91
  92   { bfd_mach_sh3,             arch_sh3,             arch_sh3_up },
  93   { bfd_mach_sh3_nommu,       arch_sh3_nommu,       arch_sh3_nommu_up },
  94   { bfd_mach_sh3_dsp,         arch_sh3_dsp,         arch_sh3_dsp_up },
  95   { bfd_mach_sh3e,            arch_sh3e,            arch_sh3e_up },
  96   { bfd_mach_sh4,             arch_sh4,             arch_sh4_up },
  97   { bfd_mach_sh4a,            arch_sh4a,            arch_sh4a_up },
  98   { bfd_mach_sh4al_dsp,       arch_sh4al_dsp,       arch_sh4al_dsp_up },
  99   { bfd_mach_sh4_nofpu,       arch_sh4_nofpu,       arch_sh4_nofpu_up },
 100   { bfd_mach_sh4_nommu_nofpu, arch_sh4_nommu_nofpu, arch_sh4_nommu_nofpu_up },
 101   { bfd_mach_sh4a_nofpu,      arch_sh4a_nofpu,      arch_sh4a_nofpu_up },
 102   { 0, 0, 0 }   /* Terminator.  */
 103 };
 104
 105
 106 /* Convert a BFD mach number into the right opcodes arch flags
 107    using the table above.  */
 108
 109 unsigned int
 110 sh_get_arch_from_bfd_mach (unsigned long mach)
 111 {
 112   int i = 0;
 113
 114   while (bfd_to_arch_table[i].bfd_mach != 0)
 115     if (bfd_to_arch_table[i].bfd_mach == mach)
 116       return bfd_to_arch_table[i].arch;
 117     else
 118       i++;
 119
 120   return SH_ARCH_UNKNOWN_ARCH;
 121 }
 122
 123
 124 /* Convert a BFD mach number into a set of opcodes arch flags
 125    describing all the compatible architectures (i.e. arch_up)
 126    using the table above.  */
 127
 128 unsigned int
 129 sh_get_arch_up_from_bfd_mach (unsigned long mach)
 130 {
 131   int i = 0;
 132
 133   while (bfd_to_arch_table[i].bfd_mach != 0)
 134     if (bfd_to_arch_table[i].bfd_mach == mach)
 135       return bfd_to_arch_table[i].arch_up;
 136     else
 137       i++;
 138
 139   return SH_ARCH_UNKNOWN_ARCH;
 140 }
 141
 142
 143 /* Convert an arbitary arch_set - not necessarily corresponding
 144    directly to anything in the table above - to the most generic
 145    architecture which supports all the required features, and
 146    return the corresponding BFD mach.  */
 147
 148 unsigned long
 149 sh_get_bfd_mach_from_arch_set (unsigned int arch_set)
 150 {
 151   unsigned long result = 0;
 152   unsigned int best = ~arch_set;
 153   unsigned int co_mask = ~0;
 154   int i = 0;
 155
 156   /* If arch_set permits variants with no coprocessor then do not allow
 157      the other irrelevant co-processor bits to influence the choice:
 158        e.g. if dsp is disallowed by arch_set, then the algorithm would
 159        prefer fpu variants over nofpu variants because they also disallow
 160        dsp - even though the nofpu would be the most correct choice.
 161      This assumes that EVERY fpu/dsp variant has a no-coprocessor
 162      counter-part, or their non-fpu/dsp instructions do not have the
 163      no co-processor bit set.  */
 164   if (arch_set & arch_sh_no_co)
 165     co_mask = ~(arch_sh_sp_fpu | arch_sh_dp_fpu | arch_sh_has_dsp);
 166
 167   while (bfd_to_arch_table[i].bfd_mach != 0)
 168     {
 169       unsigned int try = bfd_to_arch_table[i].arch_up & co_mask;
 170
 171       /* Conceptually: Find the architecture with the least number
 172          of extra features or, if they have the same number, then
 173          the greatest number of required features.  Disregard
 174          architectures where the required features alone do
 175          not describe a valid architecture.  */
 176       if (((try & ~arch_set) < (best & ~arch_set)
 177            || ((try & ~arch_set) == (best & ~arch_set)
 178                && (~try & arch_set) < (~best & arch_set)))
 179           && SH_MERGE_ARCH_SET_VALID (try, arch_set))
 180         {
 181           result = bfd_to_arch_table[i].bfd_mach;
 182           best = try;
 183         }
 184
 185       i++;
 186     }
 187
 188   /* This might happen if a new variant is added to sh-opc.h
 189      but no corresponding entry is added to the table above.  */
 190   BFD_ASSERT (result != 0);
 191
 192   return result;
 193 }