| 1 | /* Assembler interface for targets using CGEN. -*- C -*- |
| 2 | CGEN: Cpu tools GENerator |
| 3 | |
| 4 | This file is used to generate m32r-asm.c. |
| 5 | |
| 6 | Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc. |
| 7 | |
| 8 | This file is part of the GNU Binutils and GDB, the GNU debugger. |
| 9 | |
| 10 | This program is free software; you can redistribute it and/or modify |
| 11 | it under the terms of the GNU General Public License as published by |
| 12 | the Free Software Foundation; either version 2, or (at your option) |
| 13 | any later version. |
| 14 | |
| 15 | This program is distributed in the hope that it will be useful, |
| 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | GNU General Public License for more details. |
| 19 | |
| 20 | You should have received a copy of the GNU General Public License |
| 21 | along with this program; if not, write to the Free Software |
| 22 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 23 | |
| 24 | #include "sysdep.h" |
| 25 | #include <ctype.h> |
| 26 | #include <stdio.h> |
| 27 | #include "ansidecl.h" |
| 28 | #include "bfd.h" |
| 29 | #include "symcat.h" |
| 30 | #include "m32r-opc.h" |
| 31 | |
| 32 | /* ??? The layout of this stuff is still work in progress. |
| 33 | For speed in assembly/disassembly, we use inline functions. That of course |
| 34 | will only work for GCC. When this stuff is finished, we can decide whether |
| 35 | to keep the inline functions (and only get the performance increase when |
| 36 | compiled with GCC), or switch to macros, or use something else. |
| 37 | */ |
| 38 | |
| 39 | static const char * insert_normal |
| 40 | PARAMS ((long, unsigned int, int, int, int, char *)); |
| 41 | static const char * parse_insn_normal |
| 42 | PARAMS ((const CGEN_INSN *, const char **, CGEN_FIELDS *)); |
| 43 | static const char * insert_insn_normal |
| 44 | PARAMS ((const CGEN_INSN *, CGEN_FIELDS *, cgen_insn_t *)); |
| 45 | \f |
| 46 | /* -- assembler routines inserted here */ |
| 47 | /* -- asm.c */ |
| 48 | |
| 49 | /* Handle '#' prefixes (i.e. skip over them). */ |
| 50 | |
| 51 | static const char * |
| 52 | parse_hash (strp, opindex, valuep) |
| 53 | const char **strp; |
| 54 | int opindex; |
| 55 | unsigned long *valuep; |
| 56 | { |
| 57 | if (**strp == '#') |
| 58 | ++*strp; |
| 59 | return NULL; |
| 60 | } |
| 61 | |
| 62 | /* Handle shigh(), high(). */ |
| 63 | |
| 64 | static const char * |
| 65 | parse_hi16 (strp, opindex, valuep) |
| 66 | const char **strp; |
| 67 | int opindex; |
| 68 | unsigned long *valuep; |
| 69 | { |
| 70 | const char *errmsg; |
| 71 | enum cgen_parse_operand_result result_type; |
| 72 | |
| 73 | if (**strp == '#') |
| 74 | ++*strp; |
| 75 | |
| 76 | if (strncmp (*strp, "high(", 5) == 0) |
| 77 | { |
| 78 | *strp += 5; |
| 79 | errmsg = cgen_parse_address (strp, opindex, BFD_RELOC_M32R_HI16_ULO, |
| 80 | &result_type, valuep); |
| 81 | if (**strp != ')') |
| 82 | return "missing `)'"; |
| 83 | ++*strp; |
| 84 | if (errmsg == NULL |
| 85 | && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER) |
| 86 | *valuep >>= 16; |
| 87 | return errmsg; |
| 88 | } |
| 89 | else if (strncmp (*strp, "shigh(", 6) == 0) |
| 90 | { |
| 91 | *strp += 6; |
| 92 | errmsg = cgen_parse_address (strp, opindex, BFD_RELOC_M32R_HI16_SLO, |
| 93 | &result_type, valuep); |
| 94 | if (**strp != ')') |
| 95 | return "missing `)'"; |
| 96 | ++*strp; |
| 97 | if (errmsg == NULL |
| 98 | && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER) |
| 99 | *valuep = (*valuep >> 16) + ((*valuep) & 0x8000 ? 1 : 0); |
| 100 | return errmsg; |
| 101 | } |
| 102 | |
| 103 | return cgen_parse_unsigned_integer (strp, opindex, valuep); |
| 104 | } |
| 105 | |
| 106 | /* Handle low() in a signed context. Also handle sda(). |
| 107 | The signedness of the value doesn't matter to low(), but this also |
| 108 | handles the case where low() isn't present. */ |
| 109 | |
| 110 | static const char * |
| 111 | parse_slo16 (strp, opindex, valuep) |
| 112 | const char **strp; |
| 113 | int opindex; |
| 114 | long *valuep; |
| 115 | { |
| 116 | const char *errmsg; |
| 117 | enum cgen_parse_operand_result result_type; |
| 118 | |
| 119 | if (**strp == '#') |
| 120 | ++*strp; |
| 121 | |
| 122 | if (strncmp (*strp, "low(", 4) == 0) |
| 123 | { |
| 124 | *strp += 4; |
| 125 | errmsg = cgen_parse_address (strp, opindex, BFD_RELOC_M32R_LO16, |
| 126 | &result_type, valuep); |
| 127 | if (**strp != ')') |
| 128 | return "missing `)'"; |
| 129 | ++*strp; |
| 130 | if (errmsg == NULL |
| 131 | && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER) |
| 132 | *valuep &= 0xffff; |
| 133 | return errmsg; |
| 134 | } |
| 135 | |
| 136 | if (strncmp (*strp, "sda(", 4) == 0) |
| 137 | { |
| 138 | *strp += 4; |
| 139 | errmsg = cgen_parse_address (strp, opindex, BFD_RELOC_M32R_SDA16, NULL, valuep); |
| 140 | if (**strp != ')') |
| 141 | return "missing `)'"; |
| 142 | ++*strp; |
| 143 | return errmsg; |
| 144 | } |
| 145 | |
| 146 | return cgen_parse_signed_integer (strp, opindex, valuep); |
| 147 | } |
| 148 | |
| 149 | /* Handle low() in an unsigned context. |
| 150 | The signedness of the value doesn't matter to low(), but this also |
| 151 | handles the case where low() isn't present. */ |
| 152 | |
| 153 | static const char * |
| 154 | parse_ulo16 (strp, opindex, valuep) |
| 155 | const char **strp; |
| 156 | int opindex; |
| 157 | unsigned long *valuep; |
| 158 | { |
| 159 | const char *errmsg; |
| 160 | enum cgen_parse_operand_result result_type; |
| 161 | |
| 162 | if (**strp == '#') |
| 163 | ++*strp; |
| 164 | |
| 165 | if (strncmp (*strp, "low(", 4) == 0) |
| 166 | { |
| 167 | *strp += 4; |
| 168 | errmsg = cgen_parse_address (strp, opindex, BFD_RELOC_M32R_LO16, |
| 169 | &result_type, valuep); |
| 170 | if (**strp != ')') |
| 171 | return "missing `)'"; |
| 172 | ++*strp; |
| 173 | if (errmsg == NULL |
| 174 | && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER) |
| 175 | *valuep &= 0xffff; |
| 176 | return errmsg; |
| 177 | } |
| 178 | |
| 179 | return cgen_parse_unsigned_integer (strp, opindex, valuep); |
| 180 | } |
| 181 | |
| 182 | /* -- */ |
| 183 | |
| 184 | /* Main entry point for operand parsing. |
| 185 | |
| 186 | This function is basically just a big switch statement. Earlier versions |
| 187 | used tables to look up the function to use, but |
| 188 | - if the table contains both assembler and disassembler functions then |
| 189 | the disassembler contains much of the assembler and vice-versa, |
| 190 | - there's a lot of inlining possibilities as things grow, |
| 191 | - using a switch statement avoids the function call overhead. |
| 192 | |
| 193 | This function could be moved into `parse_insn_normal', but keeping it |
| 194 | separate makes clear the interface between `parse_insn_normal' and each of |
| 195 | the handlers. |
| 196 | */ |
| 197 | |
| 198 | const char * |
| 199 | m32r_cgen_parse_operand (opindex, strp, fields) |
| 200 | int opindex; |
| 201 | const char ** strp; |
| 202 | CGEN_FIELDS * fields; |
| 203 | { |
| 204 | const char * errmsg; |
| 205 | |
| 206 | switch (opindex) |
| 207 | { |
| 208 | case M32R_OPERAND_SR : |
| 209 | errmsg = cgen_parse_keyword (strp, & m32r_cgen_opval_h_gr, & fields->f_r2); |
| 210 | break; |
| 211 | case M32R_OPERAND_DR : |
| 212 | errmsg = cgen_parse_keyword (strp, & m32r_cgen_opval_h_gr, & fields->f_r1); |
| 213 | break; |
| 214 | case M32R_OPERAND_SRC1 : |
| 215 | errmsg = cgen_parse_keyword (strp, & m32r_cgen_opval_h_gr, & fields->f_r1); |
| 216 | break; |
| 217 | case M32R_OPERAND_SRC2 : |
| 218 | errmsg = cgen_parse_keyword (strp, & m32r_cgen_opval_h_gr, & fields->f_r2); |
| 219 | break; |
| 220 | case M32R_OPERAND_SCR : |
| 221 | errmsg = cgen_parse_keyword (strp, & m32r_cgen_opval_h_cr, & fields->f_r2); |
| 222 | break; |
| 223 | case M32R_OPERAND_DCR : |
| 224 | errmsg = cgen_parse_keyword (strp, & m32r_cgen_opval_h_cr, & fields->f_r1); |
| 225 | break; |
| 226 | case M32R_OPERAND_SIMM8 : |
| 227 | errmsg = cgen_parse_signed_integer (strp, M32R_OPERAND_SIMM8, &fields->f_simm8); |
| 228 | break; |
| 229 | case M32R_OPERAND_SIMM16 : |
| 230 | errmsg = cgen_parse_signed_integer (strp, M32R_OPERAND_SIMM16, &fields->f_simm16); |
| 231 | break; |
| 232 | case M32R_OPERAND_UIMM4 : |
| 233 | errmsg = cgen_parse_unsigned_integer (strp, M32R_OPERAND_UIMM4, &fields->f_uimm4); |
| 234 | break; |
| 235 | case M32R_OPERAND_UIMM5 : |
| 236 | errmsg = cgen_parse_unsigned_integer (strp, M32R_OPERAND_UIMM5, &fields->f_uimm5); |
| 237 | break; |
| 238 | case M32R_OPERAND_UIMM16 : |
| 239 | errmsg = cgen_parse_unsigned_integer (strp, M32R_OPERAND_UIMM16, &fields->f_uimm16); |
| 240 | break; |
| 241 | /* start-sanitize-m32rx */ |
| 242 | case M32R_OPERAND_IMM1 : |
| 243 | errmsg = cgen_parse_unsigned_integer (strp, M32R_OPERAND_IMM1, &fields->f_imm1); |
| 244 | break; |
| 245 | /* end-sanitize-m32rx */ |
| 246 | /* start-sanitize-m32rx */ |
| 247 | case M32R_OPERAND_ACCD : |
| 248 | errmsg = cgen_parse_keyword (strp, & m32r_cgen_opval_h_accums, & fields->f_accd); |
| 249 | break; |
| 250 | /* end-sanitize-m32rx */ |
| 251 | /* start-sanitize-m32rx */ |
| 252 | case M32R_OPERAND_ACCS : |
| 253 | errmsg = cgen_parse_keyword (strp, & m32r_cgen_opval_h_accums, & fields->f_accs); |
| 254 | break; |
| 255 | /* end-sanitize-m32rx */ |
| 256 | /* start-sanitize-m32rx */ |
| 257 | case M32R_OPERAND_ACC : |
| 258 | errmsg = cgen_parse_keyword (strp, & m32r_cgen_opval_h_accums, & fields->f_acc); |
| 259 | break; |
| 260 | /* end-sanitize-m32rx */ |
| 261 | case M32R_OPERAND_HASH : |
| 262 | errmsg = parse_hash (strp, M32R_OPERAND_HASH, &fields->f_nil); |
| 263 | break; |
| 264 | case M32R_OPERAND_HI16 : |
| 265 | errmsg = parse_hi16 (strp, M32R_OPERAND_HI16, &fields->f_hi16); |
| 266 | break; |
| 267 | case M32R_OPERAND_SLO16 : |
| 268 | errmsg = parse_slo16 (strp, M32R_OPERAND_SLO16, &fields->f_simm16); |
| 269 | break; |
| 270 | case M32R_OPERAND_ULO16 : |
| 271 | errmsg = parse_ulo16 (strp, M32R_OPERAND_ULO16, &fields->f_uimm16); |
| 272 | break; |
| 273 | case M32R_OPERAND_UIMM24 : |
| 274 | errmsg = cgen_parse_address (strp, M32R_OPERAND_UIMM24, 0, NULL, & fields->f_uimm24); |
| 275 | break; |
| 276 | case M32R_OPERAND_DISP8 : |
| 277 | errmsg = cgen_parse_address (strp, M32R_OPERAND_DISP8, 0, NULL, & fields->f_disp8); |
| 278 | break; |
| 279 | case M32R_OPERAND_DISP16 : |
| 280 | errmsg = cgen_parse_address (strp, M32R_OPERAND_DISP16, 0, NULL, & fields->f_disp16); |
| 281 | break; |
| 282 | case M32R_OPERAND_DISP24 : |
| 283 | errmsg = cgen_parse_address (strp, M32R_OPERAND_DISP24, 0, NULL, & fields->f_disp24); |
| 284 | break; |
| 285 | |
| 286 | default : |
| 287 | fprintf (stderr, "Unrecognized field %d while parsing.\n", opindex); |
| 288 | abort (); |
| 289 | } |
| 290 | |
| 291 | return errmsg; |
| 292 | } |
| 293 | |
| 294 | /* Main entry point for operand insertion. |
| 295 | |
| 296 | This function is basically just a big switch statement. Earlier versions |
| 297 | used tables to look up the function to use, but |
| 298 | - if the table contains both assembler and disassembler functions then |
| 299 | the disassembler contains much of the assembler and vice-versa, |
| 300 | - there's a lot of inlining possibilities as things grow, |
| 301 | - using a switch statement avoids the function call overhead. |
| 302 | |
| 303 | This function could be moved into `parse_insn_normal', but keeping it |
| 304 | separate makes clear the interface between `parse_insn_normal' and each of |
| 305 | the handlers. It's also needed by GAS to insert operands that couldn't be |
| 306 | resolved during parsing. |
| 307 | */ |
| 308 | |
| 309 | const char * |
| 310 | m32r_cgen_insert_operand (opindex, fields, buffer) |
| 311 | int opindex; |
| 312 | CGEN_FIELDS * fields; |
| 313 | char * buffer; |
| 314 | { |
| 315 | const char * errmsg; |
| 316 | |
| 317 | switch (opindex) |
| 318 | { |
| 319 | case M32R_OPERAND_SR : |
| 320 | errmsg = insert_normal (fields->f_r2, 0|(1<<CGEN_OPERAND_UNSIGNED), 12, 4, CGEN_FIELDS_BITSIZE (fields), buffer); |
| 321 | break; |
| 322 | case M32R_OPERAND_DR : |
| 323 | errmsg = insert_normal (fields->f_r1, 0|(1<<CGEN_OPERAND_UNSIGNED), 4, 4, CGEN_FIELDS_BITSIZE (fields), buffer); |
| 324 | break; |
| 325 | case M32R_OPERAND_SRC1 : |
| 326 | errmsg = insert_normal (fields->f_r1, 0|(1<<CGEN_OPERAND_UNSIGNED), 4, 4, CGEN_FIELDS_BITSIZE (fields), buffer); |
| 327 | break; |
| 328 | case M32R_OPERAND_SRC2 : |
| 329 | errmsg = insert_normal (fields->f_r2, 0|(1<<CGEN_OPERAND_UNSIGNED), 12, 4, CGEN_FIELDS_BITSIZE (fields), buffer); |
| 330 | break; |
| 331 | case M32R_OPERAND_SCR : |
| 332 | errmsg = insert_normal (fields->f_r2, 0|(1<<CGEN_OPERAND_UNSIGNED), 12, 4, CGEN_FIELDS_BITSIZE (fields), buffer); |
| 333 | break; |
| 334 | case M32R_OPERAND_DCR : |
| 335 | errmsg = insert_normal (fields->f_r1, 0|(1<<CGEN_OPERAND_UNSIGNED), 4, 4, CGEN_FIELDS_BITSIZE (fields), buffer); |
| 336 | break; |
| 337 | case M32R_OPERAND_SIMM8 : |
| 338 | errmsg = insert_normal (fields->f_simm8, 0|(1<<CGEN_OPERAND_HASH_PREFIX), 8, 8, CGEN_FIELDS_BITSIZE (fields), buffer); |
| 339 | break; |
| 340 | case M32R_OPERAND_SIMM16 : |
| 341 | errmsg = insert_normal (fields->f_simm16, 0|(1<<CGEN_OPERAND_HASH_PREFIX), 16, 16, CGEN_FIELDS_BITSIZE (fields), buffer); |
| 342 | break; |
| 343 | case M32R_OPERAND_UIMM4 : |
| 344 | errmsg = insert_normal (fields->f_uimm4, 0|(1<<CGEN_OPERAND_HASH_PREFIX)|(1<<CGEN_OPERAND_UNSIGNED), 12, 4, CGEN_FIELDS_BITSIZE (fields), buffer); |
| 345 | break; |
| 346 | case M32R_OPERAND_UIMM5 : |
| 347 | errmsg = insert_normal (fields->f_uimm5, 0|(1<<CGEN_OPERAND_HASH_PREFIX)|(1<<CGEN_OPERAND_UNSIGNED), 11, 5, CGEN_FIELDS_BITSIZE (fields), buffer); |
| 348 | break; |
| 349 | case M32R_OPERAND_UIMM16 : |
| 350 | errmsg = insert_normal (fields->f_uimm16, 0|(1<<CGEN_OPERAND_HASH_PREFIX)|(1<<CGEN_OPERAND_UNSIGNED), 16, 16, CGEN_FIELDS_BITSIZE (fields), buffer); |
| 351 | break; |
| 352 | /* start-sanitize-m32rx */ |
| 353 | case M32R_OPERAND_IMM1 : |
| 354 | { |
| 355 | long value = ((fields->f_imm1) - (1)); |
| 356 | errmsg = insert_normal (value, 0|(1<<CGEN_OPERAND_HASH_PREFIX)|(1<<CGEN_OPERAND_UNSIGNED), 15, 1, CGEN_FIELDS_BITSIZE (fields), buffer); |
| 357 | } |
| 358 | break; |
| 359 | /* end-sanitize-m32rx */ |
| 360 | /* start-sanitize-m32rx */ |
| 361 | case M32R_OPERAND_ACCD : |
| 362 | errmsg = insert_normal (fields->f_accd, 0|(1<<CGEN_OPERAND_UNSIGNED), 4, 2, CGEN_FIELDS_BITSIZE (fields), buffer); |
| 363 | break; |
| 364 | /* end-sanitize-m32rx */ |
| 365 | /* start-sanitize-m32rx */ |
| 366 | case M32R_OPERAND_ACCS : |
| 367 | errmsg = insert_normal (fields->f_accs, 0|(1<<CGEN_OPERAND_UNSIGNED), 12, 2, CGEN_FIELDS_BITSIZE (fields), buffer); |
| 368 | break; |
| 369 | /* end-sanitize-m32rx */ |
| 370 | /* start-sanitize-m32rx */ |
| 371 | case M32R_OPERAND_ACC : |
| 372 | errmsg = insert_normal (fields->f_acc, 0|(1<<CGEN_OPERAND_UNSIGNED), 8, 1, CGEN_FIELDS_BITSIZE (fields), buffer); |
| 373 | break; |
| 374 | /* end-sanitize-m32rx */ |
| 375 | case M32R_OPERAND_HASH : |
| 376 | errmsg = insert_normal (fields->f_nil, 0, 0, 0, CGEN_FIELDS_BITSIZE (fields), buffer); |
| 377 | break; |
| 378 | case M32R_OPERAND_HI16 : |
| 379 | errmsg = insert_normal (fields->f_hi16, 0|(1<<CGEN_OPERAND_SIGN_OPT)|(1<<CGEN_OPERAND_UNSIGNED), 16, 16, CGEN_FIELDS_BITSIZE (fields), buffer); |
| 380 | break; |
| 381 | case M32R_OPERAND_SLO16 : |
| 382 | errmsg = insert_normal (fields->f_simm16, 0, 16, 16, CGEN_FIELDS_BITSIZE (fields), buffer); |
| 383 | break; |
| 384 | case M32R_OPERAND_ULO16 : |
| 385 | errmsg = insert_normal (fields->f_uimm16, 0|(1<<CGEN_OPERAND_UNSIGNED), 16, 16, CGEN_FIELDS_BITSIZE (fields), buffer); |
| 386 | break; |
| 387 | case M32R_OPERAND_UIMM24 : |
| 388 | errmsg = insert_normal (fields->f_uimm24, 0|(1<<CGEN_OPERAND_HASH_PREFIX)|(1<<CGEN_OPERAND_RELOC)|(1<<CGEN_OPERAND_ABS_ADDR)|(1<<CGEN_OPERAND_UNSIGNED), 8, 24, CGEN_FIELDS_BITSIZE (fields), buffer); |
| 389 | break; |
| 390 | case M32R_OPERAND_DISP8 : |
| 391 | { |
| 392 | long value = ((fields->f_disp8) >> (2)); |
| 393 | errmsg = insert_normal (value, 0|(1<<CGEN_OPERAND_RELAX)|(1<<CGEN_OPERAND_RELOC)|(1<<CGEN_OPERAND_PCREL_ADDR), 8, 8, CGEN_FIELDS_BITSIZE (fields), buffer); |
| 394 | } |
| 395 | break; |
| 396 | case M32R_OPERAND_DISP16 : |
| 397 | { |
| 398 | long value = ((fields->f_disp16) >> (2)); |
| 399 | errmsg = insert_normal (value, 0|(1<<CGEN_OPERAND_RELOC)|(1<<CGEN_OPERAND_PCREL_ADDR), 16, 16, CGEN_FIELDS_BITSIZE (fields), buffer); |
| 400 | } |
| 401 | break; |
| 402 | case M32R_OPERAND_DISP24 : |
| 403 | { |
| 404 | long value = ((fields->f_disp24) >> (2)); |
| 405 | errmsg = insert_normal (value, 0|(1<<CGEN_OPERAND_RELAX)|(1<<CGEN_OPERAND_RELOC)|(1<<CGEN_OPERAND_PCREL_ADDR), 8, 24, CGEN_FIELDS_BITSIZE (fields), buffer); |
| 406 | } |
| 407 | break; |
| 408 | |
| 409 | default : |
| 410 | fprintf (stderr, "Unrecognized field %d while building insn.\n", |
| 411 | opindex); |
| 412 | abort (); |
| 413 | } |
| 414 | |
| 415 | return errmsg; |
| 416 | } |
| 417 | |
| 418 | cgen_parse_fn * m32r_cgen_parse_handlers[] = |
| 419 | { |
| 420 | 0, /* default */ |
| 421 | parse_insn_normal, |
| 422 | }; |
| 423 | |
| 424 | cgen_insert_fn * m32r_cgen_insert_handlers[] = |
| 425 | { |
| 426 | 0, /* default */ |
| 427 | insert_insn_normal, |
| 428 | }; |
| 429 | |
| 430 | void |
| 431 | m32r_cgen_init_asm (mach, endian) |
| 432 | int mach; |
| 433 | enum cgen_endian endian; |
| 434 | { |
| 435 | m32r_cgen_init_tables (mach); |
| 436 | cgen_set_cpu (& m32r_cgen_opcode_table, mach, endian); |
| 437 | cgen_asm_init (); |
| 438 | } |
| 439 | |
| 440 | \f |
| 441 | /* Default insertion routine. |
| 442 | |
| 443 | ATTRS is a mask of the boolean attributes. |
| 444 | LENGTH is the length of VALUE in bits. |
| 445 | TOTAL_LENGTH is the total length of the insn (currently 8,16,32). |
| 446 | |
| 447 | The result is an error message or NULL if success. */ |
| 448 | |
| 449 | /* ??? This duplicates functionality with bfd's howto table and |
| 450 | bfd_install_relocation. */ |
| 451 | /* ??? For architectures where insns can be representable as ints, |
| 452 | store insn in `field' struct and add registers, etc. while parsing? */ |
| 453 | |
| 454 | static const char * |
| 455 | insert_normal (value, attrs, start, length, total_length, buffer) |
| 456 | long value; |
| 457 | unsigned int attrs; |
| 458 | int start; |
| 459 | int length; |
| 460 | int total_length; |
| 461 | char * buffer; |
| 462 | { |
| 463 | bfd_vma x; |
| 464 | static char buf[100]; |
| 465 | |
| 466 | /* Ensure VALUE will fit. */ |
| 467 | if ((attrs & (1 << CGEN_OPERAND_UNSIGNED)) != 0) |
| 468 | { |
| 469 | unsigned long max = (1 << length) - 1; |
| 470 | if ((unsigned long) value > max) |
| 471 | { |
| 472 | const char *err = "operand out of range (%lu not between 0 and %lu)"; |
| 473 | |
| 474 | sprintf (buf, err, value, max); |
| 475 | return buf; |
| 476 | } |
| 477 | } |
| 478 | else |
| 479 | { |
| 480 | long min = - (1 << (length - 1)); |
| 481 | long max = (1 << (length - 1)) - 1; |
| 482 | if (value < min || value > max) |
| 483 | { |
| 484 | const char *err = "operand out of range (%ld not between %ld and %ld)"; |
| 485 | |
| 486 | sprintf (buf, err, value, min, max); |
| 487 | return buf; |
| 488 | } |
| 489 | } |
| 490 | |
| 491 | #if 0 /*def CGEN_INT_INSN*/ |
| 492 | *buffer |= ((value & ((1 << length) - 1)) |
| 493 | << (total_length - (start + length))); |
| 494 | #else |
| 495 | switch (total_length) |
| 496 | { |
| 497 | case 8: |
| 498 | x = * (unsigned char *) buffer; |
| 499 | break; |
| 500 | case 16: |
| 501 | if (CGEN_CURRENT_ENDIAN == CGEN_ENDIAN_BIG) |
| 502 | x = bfd_getb16 (buffer); |
| 503 | else |
| 504 | x = bfd_getl16 (buffer); |
| 505 | break; |
| 506 | case 32: |
| 507 | if (CGEN_CURRENT_ENDIAN == CGEN_ENDIAN_BIG) |
| 508 | x = bfd_getb32 (buffer); |
| 509 | else |
| 510 | x = bfd_getl32 (buffer); |
| 511 | break; |
| 512 | default : |
| 513 | abort (); |
| 514 | } |
| 515 | |
| 516 | x |= ((value & ((1 << length) - 1)) |
| 517 | << (total_length - (start + length))); |
| 518 | |
| 519 | switch (total_length) |
| 520 | { |
| 521 | case 8: |
| 522 | * buffer = value; |
| 523 | break; |
| 524 | case 16: |
| 525 | if (CGEN_CURRENT_ENDIAN == CGEN_ENDIAN_BIG) |
| 526 | bfd_putb16 (x, buffer); |
| 527 | else |
| 528 | bfd_putl16 (x, buffer); |
| 529 | break; |
| 530 | case 32: |
| 531 | if (CGEN_CURRENT_ENDIAN == CGEN_ENDIAN_BIG) |
| 532 | bfd_putb32 (x, buffer); |
| 533 | else |
| 534 | bfd_putl32 (x, buffer); |
| 535 | break; |
| 536 | default : |
| 537 | abort (); |
| 538 | } |
| 539 | #endif |
| 540 | |
| 541 | return NULL; |
| 542 | } |
| 543 | \f |
| 544 | /* Default insn parser. |
| 545 | |
| 546 | The syntax string is scanned and operands are parsed and stored in FIELDS. |
| 547 | Relocs are queued as we go via other callbacks. |
| 548 | |
| 549 | ??? Note that this is currently an all-or-nothing parser. If we fail to |
| 550 | parse the instruction, we return 0 and the caller will start over from |
| 551 | the beginning. Backtracking will be necessary in parsing subexpressions, |
| 552 | but that can be handled there. Not handling backtracking here may get |
| 553 | expensive in the case of the m68k. Deal with later. |
| 554 | |
| 555 | Returns NULL for success, an error message for failure. |
| 556 | */ |
| 557 | |
| 558 | static const char * |
| 559 | parse_insn_normal (insn, strp, fields) |
| 560 | const CGEN_INSN * insn; |
| 561 | const char ** strp; |
| 562 | CGEN_FIELDS * fields; |
| 563 | { |
| 564 | const CGEN_SYNTAX * syntax = CGEN_INSN_SYNTAX (insn); |
| 565 | const char * str = *strp; |
| 566 | const char * errmsg; |
| 567 | const char * p; |
| 568 | const unsigned char * syn; |
| 569 | #ifdef CGEN_MNEMONIC_OPERANDS |
| 570 | int past_opcode_p; |
| 571 | #endif |
| 572 | |
| 573 | /* For now we assume the mnemonic is first (there are no leading operands). |
| 574 | We can parse it without needing to set up operand parsing. */ |
| 575 | p = CGEN_INSN_MNEMONIC (insn); |
| 576 | while (* p && * p == * str) |
| 577 | ++ p, ++ str; |
| 578 | if (* p || (* str && !isspace (* str))) |
| 579 | return "unrecognized instruction"; |
| 580 | |
| 581 | CGEN_INIT_PARSE (); |
| 582 | cgen_init_parse_operand (); |
| 583 | #ifdef CGEN_MNEMONIC_OPERANDS |
| 584 | past_opcode_p = 0; |
| 585 | #endif |
| 586 | |
| 587 | /* We don't check for (*str != '\0') here because we want to parse |
| 588 | any trailing fake arguments in the syntax string. */ |
| 589 | syn = CGEN_SYNTAX_STRING (CGEN_INSN_SYNTAX (insn)); |
| 590 | |
| 591 | /* Mnemonics come first for now, ensure valid string. */ |
| 592 | if (! CGEN_SYNTAX_MNEMONIC_P (* syn)) |
| 593 | abort (); |
| 594 | |
| 595 | ++syn; |
| 596 | |
| 597 | while (* syn != 0) |
| 598 | { |
| 599 | /* Non operand chars must match exactly. */ |
| 600 | /* FIXME: Need to better handle whitespace. */ |
| 601 | if (CGEN_SYNTAX_CHAR_P (* syn)) |
| 602 | { |
| 603 | if (*str == CGEN_SYNTAX_CHAR (* syn)) |
| 604 | { |
| 605 | #ifdef CGEN_MNEMONIC_OPERANDS |
| 606 | if (* syn == ' ') |
| 607 | past_opcode_p = 1; |
| 608 | #endif |
| 609 | ++ syn; |
| 610 | ++ str; |
| 611 | } |
| 612 | else |
| 613 | { |
| 614 | /* Syntax char didn't match. Can't be this insn. */ |
| 615 | /* FIXME: would like to return something like |
| 616 | "expected char `c'" */ |
| 617 | return "syntax error"; |
| 618 | } |
| 619 | continue; |
| 620 | } |
| 621 | |
| 622 | /* We have an operand of some sort. */ |
| 623 | errmsg = m32r_cgen_parse_operand (CGEN_SYNTAX_FIELD (*syn), |
| 624 | &str, fields); |
| 625 | if (errmsg) |
| 626 | return errmsg; |
| 627 | |
| 628 | /* Done with this operand, continue with next one. */ |
| 629 | ++ syn; |
| 630 | } |
| 631 | |
| 632 | /* If we're at the end of the syntax string, we're done. */ |
| 633 | if (* syn == '\0') |
| 634 | { |
| 635 | /* FIXME: For the moment we assume a valid `str' can only contain |
| 636 | blanks now. IE: We needn't try again with a longer version of |
| 637 | the insn and it is assumed that longer versions of insns appear |
| 638 | before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3). */ |
| 639 | while (isspace (* str)) |
| 640 | ++ str; |
| 641 | |
| 642 | if (* str != '\0') |
| 643 | return "junk at end of line"; /* FIXME: would like to include `str' */ |
| 644 | |
| 645 | return NULL; |
| 646 | } |
| 647 | |
| 648 | /* We couldn't parse it. */ |
| 649 | return "unrecognized instruction"; |
| 650 | } |
| 651 | |
| 652 | /* Default insn builder (insert handler). |
| 653 | The instruction is recorded in target byte order. |
| 654 | The result is an error message or NULL if success. */ |
| 655 | /* FIXME: change buffer to char *? */ |
| 656 | |
| 657 | static const char * |
| 658 | insert_insn_normal (insn, fields, buffer) |
| 659 | const CGEN_INSN * insn; |
| 660 | CGEN_FIELDS * fields; |
| 661 | cgen_insn_t * buffer; |
| 662 | { |
| 663 | const CGEN_SYNTAX * syntax = CGEN_INSN_SYNTAX (insn); |
| 664 | bfd_vma value; |
| 665 | const unsigned char * syn; |
| 666 | |
| 667 | CGEN_INIT_INSERT (); |
| 668 | value = CGEN_INSN_VALUE (insn); |
| 669 | |
| 670 | /* If we're recording insns as numbers (rather than a string of bytes), |
| 671 | target byte order handling is deferred until later. */ |
| 672 | #undef min |
| 673 | #define min(a,b) ((a) < (b) ? (a) : (b)) |
| 674 | #if 0 /*def CGEN_INT_INSN*/ |
| 675 | *buffer = value; |
| 676 | #else |
| 677 | switch (min (CGEN_BASE_INSN_BITSIZE, CGEN_FIELDS_BITSIZE (fields))) |
| 678 | { |
| 679 | case 8: |
| 680 | * buffer = value; |
| 681 | break; |
| 682 | case 16: |
| 683 | if (CGEN_CURRENT_ENDIAN == CGEN_ENDIAN_BIG) |
| 684 | bfd_putb16 (value, (char *) buffer); |
| 685 | else |
| 686 | bfd_putl16 (value, (char *) buffer); |
| 687 | break; |
| 688 | case 32: |
| 689 | if (CGEN_CURRENT_ENDIAN == CGEN_ENDIAN_BIG) |
| 690 | bfd_putb32 (value, (char *) buffer); |
| 691 | else |
| 692 | bfd_putl32 (value, (char *) buffer); |
| 693 | break; |
| 694 | default: |
| 695 | abort (); |
| 696 | } |
| 697 | #endif |
| 698 | |
| 699 | /* ??? Rather than scanning the syntax string again, we could store |
| 700 | in `fields' a null terminated list of the fields that are present. */ |
| 701 | |
| 702 | for (syn = CGEN_SYNTAX_STRING (syntax); * syn != '\0'; ++ syn) |
| 703 | { |
| 704 | const char *errmsg; |
| 705 | |
| 706 | if (CGEN_SYNTAX_CHAR_P (* syn)) |
| 707 | continue; |
| 708 | |
| 709 | errmsg = m32r_cgen_insert_operand (CGEN_SYNTAX_FIELD (*syn), fields, |
| 710 | (char *) buffer); |
| 711 | if (errmsg) |
| 712 | return errmsg; |
| 713 | } |
| 714 | |
| 715 | return NULL; |
| 716 | } |
| 717 | \f |
| 718 | /* Main entry point. |
| 719 | This routine is called for each instruction to be assembled. |
| 720 | STR points to the insn to be assembled. |
| 721 | We assume all necessary tables have been initialized. |
| 722 | The assembled instruction, less any fixups, is stored in buf. |
| 723 | [??? What byte order?] |
| 724 | The result is a pointer to the insn's entry in the opcode table, |
| 725 | or NULL if an error occured (an error message will have already been |
| 726 | printed). |
| 727 | |
| 728 | Note that when processing (non-alias) macro-insns, |
| 729 | this function recurses. */ |
| 730 | |
| 731 | const CGEN_INSN * |
| 732 | m32r_cgen_assemble_insn (str, fields, buf, errmsg) |
| 733 | const char * str; |
| 734 | CGEN_FIELDS * fields; |
| 735 | cgen_insn_t * buf; |
| 736 | char ** errmsg; |
| 737 | { |
| 738 | const char * start; |
| 739 | CGEN_INSN_LIST * ilist; |
| 740 | |
| 741 | /* Skip leading white space. */ |
| 742 | while (isspace (* str)) |
| 743 | ++ str; |
| 744 | |
| 745 | /* The instructions are stored in hashed lists. |
| 746 | Get the first in the list. */ |
| 747 | ilist = CGEN_ASM_LOOKUP_INSN (str); |
| 748 | |
| 749 | /* Keep looking until we find a match. */ |
| 750 | |
| 751 | start = str; |
| 752 | for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist)) |
| 753 | { |
| 754 | const CGEN_INSN *insn = ilist->insn; |
| 755 | |
| 756 | #if 0 /* not needed as unsupported opcodes shouldn't be in the hash lists */ |
| 757 | /* Is this insn supported by the selected cpu? */ |
| 758 | if (! m32r_cgen_insn_supported (insn)) |
| 759 | continue; |
| 760 | #endif |
| 761 | |
| 762 | #if 1 /* FIXME: wip */ |
| 763 | /* If the RELAX attribute is set, this is an insn that shouldn't be |
| 764 | chosen immediately. Instead, it is used during assembler/linker |
| 765 | relaxation if possible. */ |
| 766 | if (CGEN_INSN_ATTR (insn, CGEN_INSN_RELAX) != 0) |
| 767 | continue; |
| 768 | #endif |
| 769 | |
| 770 | str = start; |
| 771 | |
| 772 | /* Record a default length for the insn. This will get set to the |
| 773 | correct value while parsing. */ |
| 774 | /* FIXME: wip */ |
| 775 | CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn); |
| 776 | |
| 777 | if (! CGEN_PARSE_FN (insn) (insn, & str, fields)) |
| 778 | { |
| 779 | if (CGEN_INSERT_FN (insn) (insn, fields, buf) != NULL) |
| 780 | continue; |
| 781 | /* It is up to the caller to actually output the insn and any |
| 782 | queued relocs. */ |
| 783 | return insn; |
| 784 | } |
| 785 | |
| 786 | /* Try the next entry. */ |
| 787 | } |
| 788 | |
| 789 | /* FIXME: We can return a better error message than this. |
| 790 | Need to track why it failed and pick the right one. */ |
| 791 | { |
| 792 | static char errbuf[100]; |
| 793 | sprintf (errbuf, "bad instruction `%.50s%s'", |
| 794 | start, strlen (start) > 50 ? "..." : ""); |
| 795 | *errmsg = errbuf; |
| 796 | return NULL; |
| 797 | } |
| 798 | } |
| 799 | \f |
| 800 | #if 0 /* This calls back to GAS which we can't do without care. */ |
| 801 | |
| 802 | /* Record each member of OPVALS in the assembler's symbol table. |
| 803 | This lets GAS parse registers for us. |
| 804 | ??? Interesting idea but not currently used. */ |
| 805 | |
| 806 | /* Record each member of OPVALS in the assembler's symbol table. |
| 807 | FIXME: Not currently used. */ |
| 808 | |
| 809 | void |
| 810 | m32r_cgen_asm_hash_keywords (opvals) |
| 811 | CGEN_KEYWORD * opvals; |
| 812 | { |
| 813 | CGEN_KEYWORD_SEARCH search = cgen_keyword_search_init (opvals, NULL); |
| 814 | const CGEN_KEYWORD_ENTRY * ke; |
| 815 | |
| 816 | while ((ke = cgen_keyword_search_next (& search)) != NULL) |
| 817 | { |
| 818 | #if 0 /* Unnecessary, should be done in the search routine. */ |
| 819 | if (! m32r_cgen_opval_supported (ke)) |
| 820 | continue; |
| 821 | #endif |
| 822 | cgen_asm_record_register (ke->name, ke->value); |
| 823 | } |
| 824 | } |
| 825 | |
| 826 | #endif /* 0 */ |