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 } 200