1/* BFD library support routines for architectures. 2 Copyright (C) 1990-2017 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 27static const bfd_arch_info_type * 28bfd_m68k_compatible (const bfd_arch_info_type *a, 29 const bfd_arch_info_type *b); 30 31#define N(name, print,d,next) \ 32{ 32, 32, 8, bfd_arch_m68k, name, "m68k",print,2,d,bfd_m68k_compatible, \ 33 bfd_default_scan, bfd_arch_default_fill, next, } 34 35static const bfd_arch_info_type arch_info_struct[] = 36 { 37 N(bfd_mach_m68000, "m68k:68000", FALSE, &arch_info_struct[1]), 38 N(bfd_mach_m68008, "m68k:68008", FALSE, &arch_info_struct[2]), 39 N(bfd_mach_m68010, "m68k:68010", FALSE, &arch_info_struct[3]), 40 N(bfd_mach_m68020, "m68k:68020", FALSE, &arch_info_struct[4]), 41 N(bfd_mach_m68030, "m68k:68030", FALSE, &arch_info_struct[5]), 42 N(bfd_mach_m68040, "m68k:68040", FALSE, &arch_info_struct[6]), 43 N(bfd_mach_m68060, "m68k:68060", FALSE, &arch_info_struct[7]), 44 N(bfd_mach_cpu32, "m68k:cpu32", FALSE, &arch_info_struct[8]), 45 N(bfd_mach_fido, "m68k:fido", FALSE, &arch_info_struct[9]), 46 47 /* Various combinations of CF architecture features */ 48 N(bfd_mach_mcf_isa_a_nodiv, "m68k:isa-a:nodiv", 49 FALSE, &arch_info_struct[10]), 50 N(bfd_mach_mcf_isa_a, "m68k:isa-a", 51 FALSE, &arch_info_struct[11]), 52 N(bfd_mach_mcf_isa_a_mac, "m68k:isa-a:mac", 53 FALSE, &arch_info_struct[12]), 54 N(bfd_mach_mcf_isa_a_emac, "m68k:isa-a:emac", 55 FALSE, &arch_info_struct[13]), 56 N(bfd_mach_mcf_isa_aplus, "m68k:isa-aplus", 57 FALSE, &arch_info_struct[14]), 58 N(bfd_mach_mcf_isa_aplus_mac, "m68k:isa-aplus:mac", 59 FALSE, &arch_info_struct[15]), 60 N(bfd_mach_mcf_isa_aplus_emac, "m68k:isa-aplus:emac", 61 FALSE, &arch_info_struct[16]), 62 N(bfd_mach_mcf_isa_b_nousp, "m68k:isa-b:nousp", 63 FALSE, &arch_info_struct[17]), 64 N(bfd_mach_mcf_isa_b_nousp_mac, "m68k:isa-b:nousp:mac", 65 FALSE, &arch_info_struct[18]), 66 N(bfd_mach_mcf_isa_b_nousp_emac, "m68k:isa-b:nousp:emac", 67 FALSE, &arch_info_struct[19]), 68 N(bfd_mach_mcf_isa_b, "m68k:isa-b", 69 FALSE, &arch_info_struct[20]), 70 N(bfd_mach_mcf_isa_b_mac, "m68k:isa-b:mac", 71 FALSE, &arch_info_struct[21]), 72 N(bfd_mach_mcf_isa_b_emac, "m68k:isa-b:emac", 73 FALSE, &arch_info_struct[22]), 74 N(bfd_mach_mcf_isa_b_float, "m68k:isa-b:float", 75 FALSE, &arch_info_struct[23]), 76 N(bfd_mach_mcf_isa_b_float_mac, "m68k:isa-b:float:mac", 77 FALSE, &arch_info_struct[24]), 78 N(bfd_mach_mcf_isa_b_float_emac, "m68k:isa-b:float:emac", 79 FALSE, &arch_info_struct[25]), 80 N(bfd_mach_mcf_isa_c, "m68k:isa-c", 81 FALSE, &arch_info_struct[26]), 82 N(bfd_mach_mcf_isa_c_mac, "m68k:isa-c:mac", 83 FALSE, &arch_info_struct[27]), 84 N(bfd_mach_mcf_isa_c_emac, "m68k:isa-c:emac", 85 FALSE, &arch_info_struct[28]), 86 N(bfd_mach_mcf_isa_c_nodiv, "m68k:isa-c:nodiv", 87 FALSE, &arch_info_struct[29]), 88 N(bfd_mach_mcf_isa_c_nodiv_mac, "m68k:isa-c:nodiv:mac", 89 FALSE, &arch_info_struct[30]), 90 N(bfd_mach_mcf_isa_c_nodiv_emac, "m68k:isa-c:nodiv:emac", 91 FALSE, &arch_info_struct[31]), 92 93 /* Legacy names for CF architectures */ 94 N(bfd_mach_mcf_isa_a_nodiv, "m68k:5200", FALSE, &arch_info_struct[32]), 95 N(bfd_mach_mcf_isa_a_mac,"m68k:5206e", FALSE, &arch_info_struct[33]), 96 N(bfd_mach_mcf_isa_a_mac, "m68k:5307", FALSE, &arch_info_struct[34]), 97 N(bfd_mach_mcf_isa_b_nousp_mac, "m68k:5407", FALSE, &arch_info_struct[35]), 98 N(bfd_mach_mcf_isa_aplus_emac, "m68k:528x", FALSE, &arch_info_struct[36]), 99 N(bfd_mach_mcf_isa_aplus_emac, "m68k:521x", FALSE, &arch_info_struct[37]), 100 N(bfd_mach_mcf_isa_a_emac, "m68k:5249", FALSE, &arch_info_struct[38]), 101 N(bfd_mach_mcf_isa_b_float_emac, "m68k:547x", 102 FALSE, &arch_info_struct[39]), 103 N(bfd_mach_mcf_isa_b_float_emac, "m68k:548x", 104 FALSE, &arch_info_struct[40]), 105 N(bfd_mach_mcf_isa_b_float_emac, "m68k:cfv4e", FALSE, 0), 106 }; 107 108const bfd_arch_info_type bfd_m68k_arch = 109 N(0, "m68k", TRUE, &arch_info_struct[0]); 110 111/* Table indexed by bfd_mach_arch number indicating which 112 architectural features are supported. */ 113static const unsigned m68k_arch_features[] = 114{ 115 0, 116 m68000|m68881|m68851, 117 m68000|m68881|m68851, 118 m68010|m68881|m68851, 119 m68020|m68881|m68851, 120 m68030|m68881|m68851, 121 m68040|m68881|m68851, 122 m68060|m68881|m68851, 123 cpu32|m68881, 124 fido_a|m68881, 125 mcfisa_a, 126 mcfisa_a|mcfhwdiv, 127 mcfisa_a|mcfhwdiv|mcfmac, 128 mcfisa_a|mcfhwdiv|mcfemac, 129 mcfisa_a|mcfisa_aa|mcfhwdiv|mcfusp, 130 mcfisa_a|mcfisa_aa|mcfhwdiv|mcfusp|mcfmac, 131 mcfisa_a|mcfisa_aa|mcfhwdiv|mcfusp|mcfemac, 132 mcfisa_a|mcfhwdiv|mcfisa_b, 133 mcfisa_a|mcfhwdiv|mcfisa_b|mcfmac, 134 mcfisa_a|mcfhwdiv|mcfisa_b|mcfemac, 135 mcfisa_a|mcfhwdiv|mcfisa_b|mcfusp, 136 mcfisa_a|mcfhwdiv|mcfisa_b|mcfusp|mcfmac, 137 mcfisa_a|mcfhwdiv|mcfisa_b|mcfusp|mcfemac, 138 mcfisa_a|mcfhwdiv|mcfisa_b|mcfusp|cfloat, 139 mcfisa_a|mcfhwdiv|mcfisa_b|mcfusp|cfloat|mcfmac, 140 mcfisa_a|mcfhwdiv|mcfisa_b|mcfusp|cfloat|mcfemac, 141 mcfisa_a|mcfhwdiv|mcfisa_c|mcfusp, 142 mcfisa_a|mcfhwdiv|mcfisa_c|mcfusp|mcfmac, 143 mcfisa_a|mcfhwdiv|mcfisa_c|mcfusp|mcfemac, 144 mcfisa_a|mcfisa_c|mcfusp, 145 mcfisa_a|mcfisa_c|mcfusp|mcfmac, 146 mcfisa_a|mcfisa_c|mcfusp|mcfemac, 147}; 148 149/* Return the count of bits set in MASK */ 150static unsigned 151bit_count (unsigned mask) 152{ 153 unsigned ix; 154 155 for (ix = 0; mask; ix++) 156 /* Clear the LSB set */ 157 mask ^= mask & -mask; 158 return ix; 159} 160 161/* Return the architectural features supported by MACH */ 162 163unsigned 164bfd_m68k_mach_to_features (int mach) 165{ 166 if ((unsigned)mach 167 >= sizeof (m68k_arch_features) / sizeof (m68k_arch_features[0])) 168 mach = 0; 169 return m68k_arch_features[mach]; 170} 171 172/* Return the bfd machine that most closely represents the 173 architectural features. We find the machine with the smallest 174 number of additional features. If there is no such machine, we 175 find the one with the smallest number of missing features. */ 176 177int bfd_m68k_features_to_mach (unsigned features) 178{ 179 int superset = 0, subset = 0; 180 unsigned extra = 99, missing = 99; 181 unsigned ix; 182 183 for (ix = 0; 184 ix != sizeof (m68k_arch_features) / sizeof (m68k_arch_features[0]); 185 ix++) 186 { 187 unsigned this_extra, this_missing; 188 189 if (m68k_arch_features[ix] == features) 190 return ix; 191 this_extra = bit_count (m68k_arch_features[ix] & ~features); 192 if (this_extra < extra) 193 { 194 extra = this_extra; 195 superset = ix; 196 } 197 198 this_missing = bit_count (features & ~m68k_arch_features[ix]); 199 if (this_missing < missing) 200 { 201 missing = this_missing; 202 superset = ix; 203 } 204 } 205 return superset ? superset : subset; 206} 207 208static const bfd_arch_info_type * 209bfd_m68k_compatible (const bfd_arch_info_type *a, 210 const bfd_arch_info_type *b) 211{ 212 if (a->arch != b->arch) 213 return NULL; 214 215 if (a->bits_per_word != b->bits_per_word) 216 return NULL; 217 218 if (!a->mach) 219 return b; 220 if (!b->mach) 221 return a; 222 223 if (a->mach <= bfd_mach_m68060 && b->mach <= bfd_mach_m68060) 224 /* Merge m68k machine. */ 225 return a->mach > b->mach ? a : b; 226 else if (a->mach >= bfd_mach_cpu32 && b->mach >= bfd_mach_cpu32) 227 { 228 /* Merge the machine features. */ 229 unsigned features = (bfd_m68k_mach_to_features (a->mach) 230 | bfd_m68k_mach_to_features (b->mach)); 231 232 /* CPU32 and Coldfire are incompatible. */ 233 if ((~features & (cpu32 | mcfisa_a)) == 0) 234 return NULL; 235 236 /* Fido and Coldfire are incompatible. */ 237 if ((~features & (fido_a | mcfisa_a)) == 0) 238 return NULL; 239 240 /* ISA A+ and ISA B are incompatible. */ 241 if ((~features & (mcfisa_aa | mcfisa_b)) == 0) 242 return NULL; 243 244 /* ISA B and ISA C are incompatible. */ 245 if ((~features & (mcfisa_b | mcfisa_c)) == 0) 246 return NULL; 247 248 /* MAC and EMAC code cannot be merged. */ 249 if ((~features & (mcfmac | mcfemac)) == 0) 250 return NULL; 251 252 /* CPU32 is compatible with Fido except that Fido does not 253 support tbl instructions. Warn when the user wants to mix 254 the two. */ 255 if ((a->mach == bfd_mach_cpu32 && b->mach == bfd_mach_fido) 256 || (a->mach == bfd_mach_fido && b->mach == bfd_mach_cpu32)) 257 { 258 static int cpu32_fido_mix_warning; 259 if (!cpu32_fido_mix_warning) 260 { 261 cpu32_fido_mix_warning = 1; 262 _bfd_error_handler ("warning: linking CPU32 objects with fido objects"); 263 } 264 return bfd_lookup_arch (a->arch, 265 bfd_m68k_features_to_mach (fido_a | m68881)); 266 } 267 268 return bfd_lookup_arch (a->arch, bfd_m68k_features_to_mach (features)); 269 } 270 else 271 /* They are incompatible. */ 272 return NULL; 273} 274