bfd/cpu-m68k.c

   1 /* BFD library support routines for architectures.
   2    Copyright (C) 1990-2024 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 "opcode/m68k.h"
  26 #include "cpu-m68k.h"
  27
  28 static const bfd_arch_info_type *
  29 bfd_m68k_compatible (const bfd_arch_info_type *a,
  30                      const bfd_arch_info_type *b);
  31
  32 #define N(name, print,d,next)  \
  33 {  32, 32, 8, bfd_arch_m68k, name, "m68k",print,2,d,bfd_m68k_compatible, \
  34    bfd_default_scan, bfd_arch_default_fill, next, 0 }
  35
  36 static const bfd_arch_info_type arch_info_struct[] =
  37   {
  38     N(bfd_mach_m68000,  "m68k:68000", false, &arch_info_struct[1]),
  39     N(bfd_mach_m68008,  "m68k:68008", false, &arch_info_struct[2]),
  40     N(bfd_mach_m68010,  "m68k:68010", false, &arch_info_struct[3]),
  41     N(bfd_mach_m68020,  "m68k:68020", false, &arch_info_struct[4]),
  42     N(bfd_mach_m68030,  "m68k:68030", false, &arch_info_struct[5]),
  43     N(bfd_mach_m68040,  "m68k:68040", false, &arch_info_struct[6]),
  44     N(bfd_mach_m68060,  "m68k:68060", false, &arch_info_struct[7]),
  45     N(bfd_mach_cpu32,   "m68k:cpu32", false, &arch_info_struct[8]),
  46     N(bfd_mach_fido,    "m68k:fido",  false, &arch_info_struct[9]),
  47
  48     /* Various combinations of CF architecture features */
  49     N(bfd_mach_mcf_isa_a_nodiv, "m68k:isa-a:nodiv",
  50       false, &arch_info_struct[10]),
  51     N(bfd_mach_mcf_isa_a, "m68k:isa-a",
  52       false, &arch_info_struct[11]),
  53     N(bfd_mach_mcf_isa_a_mac, "m68k:isa-a:mac",
  54       false, &arch_info_struct[12]),
  55     N(bfd_mach_mcf_isa_a_emac, "m68k:isa-a:emac",
  56       false, &arch_info_struct[13]),
  57     N(bfd_mach_mcf_isa_aplus, "m68k:isa-aplus",
  58       false, &arch_info_struct[14]),
  59     N(bfd_mach_mcf_isa_aplus_mac, "m68k:isa-aplus:mac",
  60       false, &arch_info_struct[15]),
  61     N(bfd_mach_mcf_isa_aplus_emac, "m68k:isa-aplus:emac",
  62       false, &arch_info_struct[16]),
  63     N(bfd_mach_mcf_isa_b_nousp, "m68k:isa-b:nousp",
  64       false, &arch_info_struct[17]),
  65     N(bfd_mach_mcf_isa_b_nousp_mac, "m68k:isa-b:nousp:mac",
  66       false, &arch_info_struct[18]),
  67     N(bfd_mach_mcf_isa_b_nousp_emac, "m68k:isa-b:nousp:emac",
  68       false, &arch_info_struct[19]),
  69     N(bfd_mach_mcf_isa_b, "m68k:isa-b",
  70       false, &arch_info_struct[20]),
  71     N(bfd_mach_mcf_isa_b_mac, "m68k:isa-b:mac",
  72       false, &arch_info_struct[21]),
  73     N(bfd_mach_mcf_isa_b_emac, "m68k:isa-b:emac",
  74       false, &arch_info_struct[22]),
  75     N(bfd_mach_mcf_isa_b_float, "m68k:isa-b:float",
  76       false, &arch_info_struct[23]),
  77     N(bfd_mach_mcf_isa_b_float_mac, "m68k:isa-b:float:mac",
  78       false, &arch_info_struct[24]),
  79     N(bfd_mach_mcf_isa_b_float_emac, "m68k:isa-b:float:emac",
  80       false, &arch_info_struct[25]),
  81     N(bfd_mach_mcf_isa_c, "m68k:isa-c",
  82       false, &arch_info_struct[26]),
  83     N(bfd_mach_mcf_isa_c_mac, "m68k:isa-c:mac",
  84       false, &arch_info_struct[27]),
  85     N(bfd_mach_mcf_isa_c_emac, "m68k:isa-c:emac",
  86       false, &arch_info_struct[28]),
  87     N(bfd_mach_mcf_isa_c_nodiv, "m68k:isa-c:nodiv",
  88       false, &arch_info_struct[29]),
  89     N(bfd_mach_mcf_isa_c_nodiv_mac, "m68k:isa-c:nodiv:mac",
  90       false, &arch_info_struct[30]),
  91     N(bfd_mach_mcf_isa_c_nodiv_emac, "m68k:isa-c:nodiv:emac",
  92       false, &arch_info_struct[31]),
  93
  94     /* Legacy names for CF architectures */
  95     N(bfd_mach_mcf_isa_a_nodiv, "m68k:5200", false, &arch_info_struct[32]),
  96     N(bfd_mach_mcf_isa_a_mac,"m68k:5206e", false, &arch_info_struct[33]),
  97     N(bfd_mach_mcf_isa_a_mac, "m68k:5307", false, &arch_info_struct[34]),
  98     N(bfd_mach_mcf_isa_b_nousp_mac, "m68k:5407", false, &arch_info_struct[35]),
  99     N(bfd_mach_mcf_isa_aplus_emac, "m68k:528x", false, &arch_info_struct[36]),
 100     N(bfd_mach_mcf_isa_aplus_emac, "m68k:521x", false, &arch_info_struct[37]),
 101     N(bfd_mach_mcf_isa_a_emac, "m68k:5249", false, &arch_info_struct[38]),
 102     N(bfd_mach_mcf_isa_b_float_emac, "m68k:547x",
 103       false, &arch_info_struct[39]),
 104     N(bfd_mach_mcf_isa_b_float_emac, "m68k:548x",
 105       false, &arch_info_struct[40]),
 106     N(bfd_mach_mcf_isa_b_float_emac, "m68k:cfv4e", false, 0),
 107   };
 108
 109 const bfd_arch_info_type bfd_m68k_arch =
 110   N(0, "m68k", true, &arch_info_struct[0]);
 111
 112 /* Table indexed by bfd_mach_arch number indicating which
 113    architectural features are supported.  */
 114 static const unsigned m68k_arch_features[] =
 115 {
 116   0,
 117   m68000|m68881|m68851,
 118   m68000|m68881|m68851,
 119   m68010|m68881|m68851,
 120   m68020|m68881|m68851,
 121   m68030|m68881|m68851,
 122   m68040|m68881|m68851,
 123   m68060|m68881|m68851,
 124   cpu32|m68881,
 125   fido_a|m68881,
 126   mcfisa_a,
 127   mcfisa_a|mcfhwdiv,
 128   mcfisa_a|mcfhwdiv|mcfmac,
 129   mcfisa_a|mcfhwdiv|mcfemac,
 130   mcfisa_a|mcfisa_aa|mcfhwdiv|mcfusp,
 131   mcfisa_a|mcfisa_aa|mcfhwdiv|mcfusp|mcfmac,
 132   mcfisa_a|mcfisa_aa|mcfhwdiv|mcfusp|mcfemac,
 133   mcfisa_a|mcfhwdiv|mcfisa_b,
 134   mcfisa_a|mcfhwdiv|mcfisa_b|mcfmac,
 135   mcfisa_a|mcfhwdiv|mcfisa_b|mcfemac,
 136   mcfisa_a|mcfhwdiv|mcfisa_b|mcfusp,
 137   mcfisa_a|mcfhwdiv|mcfisa_b|mcfusp|mcfmac,
 138   mcfisa_a|mcfhwdiv|mcfisa_b|mcfusp|mcfemac,
 139   mcfisa_a|mcfhwdiv|mcfisa_b|mcfusp|cfloat,
 140   mcfisa_a|mcfhwdiv|mcfisa_b|mcfusp|cfloat|mcfmac,
 141   mcfisa_a|mcfhwdiv|mcfisa_b|mcfusp|cfloat|mcfemac,
 142   mcfisa_a|mcfhwdiv|mcfisa_c|mcfusp,
 143   mcfisa_a|mcfhwdiv|mcfisa_c|mcfusp|mcfmac,
 144   mcfisa_a|mcfhwdiv|mcfisa_c|mcfusp|mcfemac,
 145   mcfisa_a|mcfisa_c|mcfusp,
 146   mcfisa_a|mcfisa_c|mcfusp|mcfmac,
 147   mcfisa_a|mcfisa_c|mcfusp|mcfemac,
 148 };
 149
 150 /* Return the count of bits set in MASK  */
 151 static unsigned
 152 bit_count (unsigned mask)
 153 {
 154   unsigned ix;
 155
 156   for (ix = 0; mask; ix++)
 157     /* Clear the LSB set */
 158     mask ^= mask & -mask;
 159   return ix;
 160 }
 161
 162 /* Return the architectural features supported by MACH */
 163
 164 unsigned
 165 bfd_m68k_mach_to_features (int mach)
 166 {
 167   if ((unsigned)mach
 168       >= sizeof (m68k_arch_features) / sizeof (m68k_arch_features[0]))
 169     mach = 0;
 170   return m68k_arch_features[mach];
 171 }
 172
 173 /* Return the bfd machine that most closely represents the
 174    architectural features.  We find the machine with the smallest
 175    number of additional features.  If there is no such machine, we
 176    find the one with the smallest number of missing features.  */
 177
 178 int bfd_m68k_features_to_mach (unsigned features)
 179 {
 180   int superset = 0, subset = 0;
 181   unsigned extra = 99, missing = 99;
 182   unsigned ix;
 183
 184   for (ix = 0;
 185        ix != sizeof (m68k_arch_features) / sizeof (m68k_arch_features[0]);
 186        ix++)
 187     {
 188       unsigned this_extra, this_missing;
 189
 190       if (m68k_arch_features[ix] == features)
 191         return ix;
 192       this_extra = bit_count (m68k_arch_features[ix] & ~features);
 193       if (this_extra < extra)
 194         {
 195           extra = this_extra;
 196           superset = ix;
 197         }
 198
 199       this_missing = bit_count (features & ~m68k_arch_features[ix]);
 200       if (this_missing < missing)
 201         {
 202           missing = this_missing;
 203           superset = ix;
 204         }
 205     }
 206   return superset ? superset : subset;
 207 }
 208
 209 static const bfd_arch_info_type *
 210 bfd_m68k_compatible (const bfd_arch_info_type *a,
 211                      const bfd_arch_info_type *b)
 212 {
 213   if (a->arch != b->arch)
 214     return NULL;
 215
 216   if (a->bits_per_word != b->bits_per_word)
 217     return NULL;
 218
 219   if (!a->mach)
 220     return b;
 221   if (!b->mach)
 222     return a;
 223
 224   if (a->mach <= bfd_mach_m68060 && b->mach <= bfd_mach_m68060)
 225     /* Merge m68k machine. */
 226     return a->mach > b->mach ? a : b;
 227   else if (a->mach >= bfd_mach_cpu32 && b->mach >= bfd_mach_cpu32)
 228     {
 229       /* Merge the machine features.  */
 230       unsigned features = (bfd_m68k_mach_to_features (a->mach)
 231                            | bfd_m68k_mach_to_features (b->mach));
 232
 233       /* CPU32 and Coldfire are incompatible.  */
 234       if ((~features & (cpu32 | mcfisa_a)) == 0)
 235         return NULL;
 236
 237       /* Fido and Coldfire are incompatible.  */
 238       if ((~features & (fido_a | mcfisa_a)) == 0)
 239         return NULL;
 240
 241       /* ISA A+ and ISA B are incompatible.  */
 242       if ((~features & (mcfisa_aa | mcfisa_b)) == 0)
 243         return NULL;
 244
 245       /* ISA B and ISA C are incompatible.  */
 246       if ((~features & (mcfisa_b | mcfisa_c)) == 0)
 247         return NULL;
 248
 249       /* MAC and EMAC code cannot be merged.  */
 250       if ((~features & (mcfmac | mcfemac)) == 0)
 251         return NULL;
 252
 253       /* CPU32 is compatible with Fido except that Fido does not
 254          support tbl instructions.  Warn when the user wants to mix
 255          the two.  */
 256       if ((a->mach == bfd_mach_cpu32 && b->mach == bfd_mach_fido)
 257           || (a->mach == bfd_mach_fido && b->mach == bfd_mach_cpu32))
 258         {
 259           static int cpu32_fido_mix_warning;
 260           if (!cpu32_fido_mix_warning)
 261             {
 262               cpu32_fido_mix_warning = 1;
 263               _bfd_error_handler ("warning: linking CPU32 objects with fido objects");
 264             }
 265           return bfd_lookup_arch (a->arch,
 266                                   bfd_m68k_features_to_mach (fido_a | m68881));
 267         }
 268
 269       return bfd_lookup_arch (a->arch, bfd_m68k_features_to_mach (features));
 270     }
 271   else
 272     /* They are incompatible.  */
 273     return NULL;
 274 }