bfd/cpu-sh.c

   1 /* BFD library support routines for the Renesas / SuperH SH architecture.
   2    Copyright (C) 1993-2020 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   /* Machine not found.   */
 121   BFD_FAIL();
 122
 123   return SH_ARCH_UNKNOWN_ARCH;
 124 }
 125
 126
 127 /* Convert a BFD mach number into a set of opcodes arch flags
 128    describing all the compatible architectures (i.e. arch_up)
 129    using the table above.  */
 130
 131 unsigned int
 132 sh_get_arch_up_from_bfd_mach (unsigned long mach)
 133 {
 134   int i = 0;
 135
 136   while (bfd_to_arch_table[i].bfd_mach != 0)
 137     if (bfd_to_arch_table[i].bfd_mach == mach)
 138       return bfd_to_arch_table[i].arch_up;
 139     else
 140       i++;
 141
 142   /* Machine not found.  */
 143   BFD_FAIL();
 144
 145   return SH_ARCH_UNKNOWN_ARCH;
 146 }
 147
 148
 149 /* Convert an arbitary arch_set - not necessarily corresponding
 150    directly to anything in the table above - to the most generic
 151    architecture which supports all the required features, and
 152    return the corresponding BFD mach.  */
 153
 154 unsigned long
 155 sh_get_bfd_mach_from_arch_set (unsigned int arch_set)
 156 {
 157   unsigned long result = 0;
 158   unsigned int best = ~arch_set;
 159   unsigned int co_mask = ~0;
 160   int i = 0;
 161
 162   /* If arch_set permits variants with no coprocessor then do not allow
 163      the other irrelevant co-processor bits to influence the choice:
 164        e.g. if dsp is disallowed by arch_set, then the algorithm would
 165        prefer fpu variants over nofpu variants because they also disallow
 166        dsp - even though the nofpu would be the most correct choice.
 167      This assumes that EVERY fpu/dsp variant has a no-coprocessor
 168      counter-part, or their non-fpu/dsp instructions do not have the
 169      no co-processor bit set.  */
 170   if (arch_set & arch_sh_no_co)
 171     co_mask = ~(arch_sh_sp_fpu | arch_sh_dp_fpu | arch_sh_has_dsp);
 172
 173   while (bfd_to_arch_table[i].bfd_mach != 0)
 174     {
 175       unsigned int try = bfd_to_arch_table[i].arch_up & co_mask;
 176
 177       /* Conceptually: Find the architecture with the least number
 178          of extra features or, if they have the same number, then
 179          the greatest number of required features.  Disregard
 180          architectures where the required features alone do
 181          not describe a valid architecture.  */
 182       if (((try & ~arch_set) < (best & ~arch_set)
 183            || ((try & ~arch_set) == (best & ~arch_set)
 184                && (~try & arch_set) < (~best & arch_set)))
 185           && SH_MERGE_ARCH_SET_VALID (try, arch_set))
 186         {
 187           result = bfd_to_arch_table[i].bfd_mach;
 188           best = try;
 189         }
 190
 191       i++;
 192     }
 193
 194   /* This might happen if a new variant is added to sh-opc.h
 195      but no corresponding entry is added to the table above.  */
 196   BFD_ASSERT (result != 0);
 197
 198   return result;
 199 }