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