bfd/cpu-m68k.c

   1 /* BFD library support routines for architectures.
   2    Copyright 1990, 1991, 1992, 1993, 1994, 1997, 1998, 2000, 2001, 2002,
   3    2003, 2004, 2006 Free Software Foundation, Inc.
   4    Hacked by Steve Chamberlain of Cygnus Support.
   5
   6    This file is part of BFD, the Binary File Descriptor library.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  21
  22 #include "bfd.h"
  23 #include "sysdep.h"
  24 #include "libbfd.h"
  25 #include "opcode/m68k.h"
  26
  27 #define N(name, print,d,next)  \
  28 {  32, 32, 8, bfd_arch_m68k, name, "m68k",print,2,d,bfd_default_compatible,bfd_default_scan, next, }
  29
  30 static const bfd_arch_info_type arch_info_struct[] =
  31   {
  32     N(bfd_mach_m68000,  "m68k:68000", FALSE, &arch_info_struct[1]),
  33     N(bfd_mach_m68008,  "m68k:68008", FALSE, &arch_info_struct[2]),
  34     N(bfd_mach_m68010,  "m68k:68010", FALSE, &arch_info_struct[3]),
  35     N(bfd_mach_m68020,  "m68k:68020", FALSE, &arch_info_struct[4]),
  36     N(bfd_mach_m68030,  "m68k:68030", FALSE, &arch_info_struct[5]),
  37     N(bfd_mach_m68040,  "m68k:68040", FALSE, &arch_info_struct[6]),
  38     N(bfd_mach_m68060,  "m68k:68060", FALSE, &arch_info_struct[7]),
  39     N(bfd_mach_cpu32,   "m68k:cpu32", FALSE, &arch_info_struct[8]),
  40
  41     /* Various combinations of CF architecture features */
  42     N(bfd_mach_mcf_isa_a, "m68k:isa-a",
  43       FALSE, &arch_info_struct[9]),
  44     N(bfd_mach_mcf_isa_a_div, "m68k:isa-a:div",
  45       FALSE, &arch_info_struct[10]),
  46     N(bfd_mach_mcf_isa_a_div_mac, "m68k:isa-a:div:mac",
  47       FALSE, &arch_info_struct[11]),
  48     N(bfd_mach_mcf_isa_a_div_emac, "m68k:isa-a:div:emac",
  49       FALSE, &arch_info_struct[12]),
  50     N(bfd_mach_mcf_isa_aplus, "m68k:isa-a+",
  51       FALSE, &arch_info_struct[13]),
  52     N(bfd_mach_mcf_isa_aplus_mac, "m68k:isa-a+:mac",
  53       FALSE, &arch_info_struct[14]),
  54     N(bfd_mach_mcf_isa_aplus_emac, "m68k:isa-a+:emac",
  55       FALSE, &arch_info_struct[15]),
  56     N(bfd_mach_mcf_isa_aplus_usp, "m68k:isa-a+:usp",
  57       FALSE, &arch_info_struct[16]),
  58     N(bfd_mach_mcf_isa_aplus_usp_mac, "m68k:isa-a+:usp:mac",
  59       FALSE, &arch_info_struct[17]),
  60     N(bfd_mach_mcf_isa_aplus_usp_emac, "m68k:isa-a+:usp:emac",
  61       FALSE, &arch_info_struct[18]),
  62     N(bfd_mach_mcf_isa_b, "m68k:isa-b",
  63       FALSE, &arch_info_struct[19]),
  64     N(bfd_mach_mcf_isa_b_mac, "m68k:isa-b:mac",
  65       FALSE, &arch_info_struct[20]),
  66     N(bfd_mach_mcf_isa_b_emac, "m68k:isa-b:emac",
  67       FALSE, &arch_info_struct[21]),
  68     N(bfd_mach_mcf_isa_b_usp_float, "m68k:isa-b:usp:float",
  69       FALSE, &arch_info_struct[22]),
  70     N(bfd_mach_mcf_isa_b_usp_float_mac, "m68k:isa-b:usp:float:mac",
  71       FALSE, &arch_info_struct[23]),
  72     N(bfd_mach_mcf_isa_b_usp_float_emac, "m68k:isa-b:usp:float:emac",
  73       FALSE, &arch_info_struct[24]),
  74
  75     /* Legacy names for CF architectures */
  76     N(bfd_mach_mcf_isa_a, "m68k:5200",  FALSE, &arch_info_struct[25]),
  77     N(bfd_mach_mcf_isa_a_div_mac,"m68k:5206e", FALSE, &arch_info_struct[26]),
  78     N(bfd_mach_mcf_isa_a_div_mac, "m68k:5307",  FALSE, &arch_info_struct[27]),
  79     N(bfd_mach_mcf_isa_b_mac, "m68k:5407",  FALSE, &arch_info_struct[28]),
  80     N(bfd_mach_mcf_isa_aplus_usp_emac, "m68k:528x",
  81       FALSE, &arch_info_struct[29]),
  82     N(bfd_mach_mcf_isa_aplus_usp_emac, "m68k:521x",
  83       FALSE, &arch_info_struct[30]),
  84     N(bfd_mach_mcf_isa_a_div_emac, "m68k:5249",  FALSE, &arch_info_struct[31]),
  85     N(bfd_mach_mcf_isa_b_usp_float_emac, "m68k:547x",
  86       FALSE, &arch_info_struct[32]),
  87     N(bfd_mach_mcf_isa_b_usp_float_emac, "m68k:548x",
  88       FALSE, &arch_info_struct[33]),
  89     N(bfd_mach_mcf_isa_b_usp_float_emac,  "m68k:cfv4e", FALSE, 0),
  90   };
  91
  92 const bfd_arch_info_type bfd_m68k_arch =
  93   N(0, "m68k", TRUE, &arch_info_struct[0]);
  94
  95 /* Table indexed by bfd_mach_arch number indicating which
  96    architectural features are supported.  */
  97 static const unsigned m68k_arch_features[] =
  98 {
  99   0,
 100   m68000|m68881|m68851,
 101   m68000|m68881|m68851,
 102   m68010|m68881|m68851,
 103   m68020|m68881|m68851,
 104   m68030|m68881|m68851,
 105   m68040|m68881|m68851,
 106   m68060|m68881|m68851,
 107   cpu32|m68881,
 108   mcfisa_a,
 109   mcfisa_a|mcfhwdiv,
 110   mcfisa_a|mcfhwdiv|mcfmac,
 111   mcfisa_a|mcfhwdiv|mcfemac,
 112   mcfisa_a|mcfisa_aa|mcfhwdiv,
 113   mcfisa_a|mcfisa_aa|mcfhwdiv|mcfmac,
 114   mcfisa_a|mcfisa_aa|mcfhwdiv|mcfemac,
 115   mcfisa_a|mcfisa_aa|mcfhwdiv|mcfusp,
 116   mcfisa_a|mcfisa_aa|mcfhwdiv|mcfusp|mcfmac,
 117   mcfisa_a|mcfisa_aa|mcfhwdiv|mcfusp|mcfemac,
 118   mcfisa_a|mcfhwdiv|mcfisa_b,
 119   mcfisa_a|mcfhwdiv|mcfisa_b|mcfmac,
 120   mcfisa_a|mcfhwdiv|mcfisa_b|mcfemac,
 121   mcfisa_a|mcfhwdiv|mcfisa_b|mcfusp|cfloat,
 122   mcfisa_a|mcfhwdiv|mcfisa_b|mcfusp|cfloat|mcfmac,
 123   mcfisa_a|mcfhwdiv|mcfisa_b|mcfusp|cfloat|mcfemac,
 124 };
 125
 126 /* Return the count of bits set in MASK  */
 127 static unsigned
 128 bit_count (unsigned mask)
 129 {
 130   unsigned ix;
 131
 132   for (ix = 0; mask; ix++)
 133     /* Clear the LSB set */
 134     mask ^= mask & -mask;
 135   return ix;
 136 }
 137
 138 /* Return the architectural features supported by MACH */
 139
 140 unsigned
 141 bfd_m68k_mach_to_features (int mach)
 142 {
 143   if ((unsigned)mach
 144       >= sizeof (m68k_arch_features) / sizeof (m68k_arch_features[0]))
 145     mach = 0;
 146   return m68k_arch_features[mach];
 147 }
 148
 149 /* Return the bfd machine that most closely represents the
 150    architectural features.  We find the machine with the smallest
 151    number of additional features.  If there is no such machine, we
 152    find the one with the smallest number of missing features.  */
 153
 154 int bfd_m68k_features_to_mach (unsigned features)
 155 {
 156   int superset = 0, subset = 0;
 157   unsigned extra = 99, missing = 99;
 158   unsigned ix;
 159
 160   for (ix = 0;
 161        ix != sizeof (m68k_arch_features) / sizeof (m68k_arch_features[0]);
 162        ix++)
 163     {
 164       unsigned this_extra, this_missing;
 165
 166       if (m68k_arch_features[ix] == features)
 167         return ix;
 168       this_extra = bit_count (m68k_arch_features[ix] & ~features);
 169       if (this_extra < extra)
 170         {
 171           extra = this_extra;
 172           superset = ix;
 173         }
 174
 175       this_missing = bit_count (features & ~m68k_arch_features[ix]);
 176       if (this_missing < missing)
 177         {
 178           missing = this_missing;
 179           superset = ix;
 180         }
 181     }
 182   return superset ? superset : subset;
 183 }