| 1 | /* The IGEN simulator generator for GDB, the GNU Debugger. |
| 2 | |
| 3 | Copyright 2002-2015 Free Software Foundation, Inc. |
| 4 | |
| 5 | Contributed by Andrew Cagney. |
| 6 | |
| 7 | This file is part of GDB. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 3 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 21 | |
| 22 | |
| 23 | /* code-generation options: */ |
| 24 | |
| 25 | typedef enum |
| 26 | { |
| 27 | |
| 28 | /* Transfer control to an instructions semantic code using the the |
| 29 | standard call/return mechanism */ |
| 30 | |
| 31 | generate_calls, |
| 32 | |
| 33 | /* Transfer control to an instructions semantic code using |
| 34 | (computed) goto's instead of the more conventional call/return |
| 35 | mechanism */ |
| 36 | |
| 37 | generate_jumps, |
| 38 | |
| 39 | } |
| 40 | igen_code; |
| 41 | |
| 42 | typedef enum |
| 43 | { |
| 44 | nia_is_cia_plus_one, |
| 45 | nia_is_void, |
| 46 | nia_is_invalid, |
| 47 | } |
| 48 | igen_nia; |
| 49 | |
| 50 | |
| 51 | |
| 52 | typedef struct _igen_gen_options igen_gen_options; |
| 53 | struct _igen_gen_options |
| 54 | { |
| 55 | int direct_access; |
| 56 | int semantic_icache; |
| 57 | int insn_in_icache; |
| 58 | int conditional_issue; |
| 59 | int slot_verification; |
| 60 | int delayed_branch; |
| 61 | |
| 62 | /* If zeroing a register, which one? */ |
| 63 | int zero_reg; |
| 64 | int zero_reg_nr; |
| 65 | |
| 66 | /* should multiple simulators be generated? */ |
| 67 | int multi_sim; |
| 68 | |
| 69 | /* name of the default multi-sim model */ |
| 70 | char *default_model; |
| 71 | |
| 72 | /* should the simulator support multi word instructions and if so, |
| 73 | what is the max nr of words. */ |
| 74 | int multi_word; |
| 75 | |
| 76 | /* SMP? Should the generated code include SMP support (>0) and if |
| 77 | so, for how many processors? */ |
| 78 | int smp; |
| 79 | |
| 80 | /* how should the next instruction address be computed? */ |
| 81 | igen_nia nia; |
| 82 | |
| 83 | /* nr of instructions in the decoded instruction cache */ |
| 84 | int icache; |
| 85 | int icache_size; |
| 86 | |
| 87 | /* see above */ |
| 88 | igen_code code; |
| 89 | }; |
| 90 | |
| 91 | |
| 92 | typedef struct _igen_trace_options igen_trace_options; |
| 93 | struct _igen_trace_options |
| 94 | { |
| 95 | int rule_selection; |
| 96 | int rule_rejection; |
| 97 | int insn_insertion; |
| 98 | int insn_expansion; |
| 99 | int entries; |
| 100 | int combine; |
| 101 | }; |
| 102 | |
| 103 | typedef struct _igen_name |
| 104 | { |
| 105 | char *u; |
| 106 | char *l; |
| 107 | } |
| 108 | igen_name; |
| 109 | typedef struct _igen_module |
| 110 | { |
| 111 | igen_name prefix; |
| 112 | igen_name suffix; |
| 113 | } |
| 114 | igen_module; |
| 115 | |
| 116 | typedef struct _igen_module_options |
| 117 | { |
| 118 | igen_module global; |
| 119 | igen_module engine; |
| 120 | igen_module icache; |
| 121 | igen_module idecode; |
| 122 | igen_module itable; |
| 123 | igen_module semantics; |
| 124 | igen_module support; |
| 125 | } |
| 126 | igen_module_options; |
| 127 | |
| 128 | typedef struct _igen_decode_options igen_decode_options; |
| 129 | struct _igen_decode_options |
| 130 | { |
| 131 | |
| 132 | /* Combine tables? Should the generator make a second pass through |
| 133 | each generated table looking for any sub-entries that contain the |
| 134 | same instructions. Those entries being merged into a single |
| 135 | table */ |
| 136 | int combine; |
| 137 | |
| 138 | /* Instruction expansion? Should the semantic code for each |
| 139 | instruction, when the oportunity arrises, be expanded according |
| 140 | to the variable opcode files that the instruction decode process |
| 141 | renders constant */ |
| 142 | int duplicate; |
| 143 | |
| 144 | /* Treat reserved fields as constant (zero) instead of ignoring |
| 145 | their value when determining decode tables */ |
| 146 | int zero_reserved; |
| 147 | |
| 148 | /* Convert any padded switch rules into goto_switch */ |
| 149 | int switch_as_goto; |
| 150 | |
| 151 | /* Force all tables to be generated with this lookup mechanism */ |
| 152 | char *overriding_gen; |
| 153 | }; |
| 154 | |
| 155 | |
| 156 | typedef struct _igen_warn_options igen_warn_options; |
| 157 | struct _igen_warn_options |
| 158 | { |
| 159 | |
| 160 | /* Issue warning about discarded instructions */ |
| 161 | int discard; |
| 162 | |
| 163 | /* Issue warning about invalid instruction widths */ |
| 164 | int width; |
| 165 | |
| 166 | /* Issue warning about unimplemented instructions */ |
| 167 | int unimplemented; |
| 168 | |
| 169 | }; |
| 170 | |
| 171 | |
| 172 | |
| 173 | typedef struct _igen_options igen_options; |
| 174 | struct _igen_options |
| 175 | { |
| 176 | |
| 177 | /* What does the instruction look like - bit ordering, size, widths or |
| 178 | offesets */ |
| 179 | int hi_bit_nr; |
| 180 | int insn_bit_size; |
| 181 | int insn_specifying_widths; |
| 182 | |
| 183 | /* what should global names be prefixed with? */ |
| 184 | igen_module_options module; |
| 185 | |
| 186 | /* See above for options and flags */ |
| 187 | igen_gen_options gen; |
| 188 | |
| 189 | /* See above for trace options */ |
| 190 | igen_trace_options trace; |
| 191 | |
| 192 | /* See above for include options */ |
| 193 | table_include *include; |
| 194 | |
| 195 | /* See above for decode options */ |
| 196 | igen_decode_options decode; |
| 197 | |
| 198 | /* Filter set to be used on the flag field of the instruction table */ |
| 199 | filter *flags_filter; |
| 200 | |
| 201 | /* See above for warn options */ |
| 202 | igen_warn_options warn; |
| 203 | |
| 204 | /* Be more picky about the input */ |
| 205 | error_func (*warning); |
| 206 | |
| 207 | /* Model (processor) set - like flags_filter. Used to select the |
| 208 | specific ISA within a processor family. */ |
| 209 | filter *model_filter; |
| 210 | |
| 211 | /* Format name set */ |
| 212 | filter *format_name_filter; |
| 213 | }; |
| 214 | |
| 215 | extern igen_options options; |
| 216 | |
| 217 | /* default options - hopefully backward compatible */ |
| 218 | #define INIT_OPTIONS() \ |
| 219 | do { \ |
| 220 | memset (&options, 0, sizeof options); \ |
| 221 | memset (&options.warn, -1, sizeof (options.warn)); \ |
| 222 | options.hi_bit_nr = 0; \ |
| 223 | options.insn_bit_size = default_insn_bit_size; \ |
| 224 | options.insn_specifying_widths = 0; \ |
| 225 | options.module.global.prefix.u = ""; \ |
| 226 | options.module.global.prefix.l = ""; \ |
| 227 | /* the prefixes */ \ |
| 228 | options.module.engine = options.module.global; \ |
| 229 | options.module.icache = options.module.global; \ |
| 230 | options.module.idecode = options.module.global; \ |
| 231 | options.module.itable = options.module.global; \ |
| 232 | options.module.semantics = options.module.global; \ |
| 233 | options.module.support = options.module.global; \ |
| 234 | /* the suffixes */ \ |
| 235 | options.module.engine.suffix.l = "engine"; \ |
| 236 | options.module.engine.suffix.u = "ENGINE"; \ |
| 237 | options.module.icache.suffix.l = "icache"; \ |
| 238 | options.module.icache.suffix.u = "ICACHE"; \ |
| 239 | options.module.idecode.suffix.l = "idecode"; \ |
| 240 | options.module.idecode.suffix.u = "IDECODE"; \ |
| 241 | options.module.itable.suffix.l = "itable"; \ |
| 242 | options.module.itable.suffix.u = "ITABLE"; \ |
| 243 | options.module.semantics.suffix.l = "semantics"; \ |
| 244 | options.module.semantics.suffix.u = "SEMANTICS"; \ |
| 245 | options.module.support.suffix.l = "support"; \ |
| 246 | options.module.support.suffix.u = "SUPPORT"; \ |
| 247 | /* misc stuff */ \ |
| 248 | options.gen.code = generate_calls; \ |
| 249 | options.gen.icache_size = 1024; \ |
| 250 | options.warning = warning; \ |
| 251 | } while (0) |