1 /* Instruction building/extraction support for @arch@. -*- C -*- 2 3 THIS FILE IS MACHINE GENERATED WITH CGEN: Cpu tools GENerator. 4 - the resultant file is machine generated, cgen-ibld.in isn't 5 6 Copyright (C) 1996-2014 Free Software Foundation, Inc. 7 8 This file is part of libopcodes. 9 10 This library 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 3, or (at your option) 13 any later version. 14 15 It is distributed in the hope that it will be useful, but WITHOUT 16 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 17 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 18 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 Foundation, Inc., 22 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ 23 24 /* ??? Eventually more and more of this stuff can go to cpu-independent files. 25 Keep that in mind. */ 26 27 #include "sysdep.h" 28 #include <stdio.h> 29 #include "ansidecl.h" 30 #include "dis-asm.h" 31 #include "bfd.h" 32 #include "symcat.h" 33 #include "@prefix (at) -desc.h" 34 #include "@prefix (at) -opc.h" 35 #include "cgen/basic-modes.h" 36 #include "opintl.h" 37 #include "safe-ctype.h" 38 39 #undef min 40 #define min(a,b) ((a) < (b) ? (a) : (b)) 41 #undef max 42 #define max(a,b) ((a) > (b) ? (a) : (b)) 43 44 /* Used by the ifield rtx function. */ 45 #define FLD(f) (fields->f) 46 47 static const char * insert_normal 48 (CGEN_CPU_DESC, long, unsigned int, unsigned int, unsigned int, 49 unsigned int, unsigned int, unsigned int, CGEN_INSN_BYTES_PTR); 50 static const char * insert_insn_normal 51 (CGEN_CPU_DESC, const CGEN_INSN *, 52 CGEN_FIELDS *, CGEN_INSN_BYTES_PTR, bfd_vma); 53 static int extract_normal 54 (CGEN_CPU_DESC, CGEN_EXTRACT_INFO *, CGEN_INSN_INT, 55 unsigned int, unsigned int, unsigned int, unsigned int, 56 unsigned int, unsigned int, bfd_vma, long *); 57 static int extract_insn_normal 58 (CGEN_CPU_DESC, const CGEN_INSN *, CGEN_EXTRACT_INFO *, 59 CGEN_INSN_INT, CGEN_FIELDS *, bfd_vma); 60 #if CGEN_INT_INSN_P 61 static void put_insn_int_value 62 (CGEN_CPU_DESC, CGEN_INSN_BYTES_PTR, int, int, CGEN_INSN_INT); 63 #endif 64 #if ! CGEN_INT_INSN_P 65 static CGEN_INLINE void insert_1 66 (CGEN_CPU_DESC, unsigned long, int, int, int, unsigned char *); 67 static CGEN_INLINE int fill_cache 68 (CGEN_CPU_DESC, CGEN_EXTRACT_INFO *, int, int, bfd_vma); 69 static CGEN_INLINE long extract_1 70 (CGEN_CPU_DESC, CGEN_EXTRACT_INFO *, int, int, int, unsigned char *, bfd_vma); 71 #endif 72 73 /* Operand insertion. */ 75 76 #if ! CGEN_INT_INSN_P 77 78 /* Subroutine of insert_normal. */ 79 80 static CGEN_INLINE void 81 insert_1 (CGEN_CPU_DESC cd, 82 unsigned long value, 83 int start, 84 int length, 85 int word_length, 86 unsigned char *bufp) 87 { 88 unsigned long x,mask; 89 int shift; 90 91 x = cgen_get_insn_value (cd, bufp, word_length); 92 93 /* Written this way to avoid undefined behaviour. */ 94 mask = (((1L << (length - 1)) - 1) << 1) | 1; 95 if (CGEN_INSN_LSB0_P) 96 shift = (start + 1) - length; 97 else 98 shift = (word_length - (start + length)); 99 x = (x & ~(mask << shift)) | ((value & mask) << shift); 100 101 cgen_put_insn_value (cd, bufp, word_length, (bfd_vma) x); 102 } 103 104 #endif /* ! CGEN_INT_INSN_P */ 105 106 /* Default insertion routine. 107 108 ATTRS is a mask of the boolean attributes. 109 WORD_OFFSET is the offset in bits from the start of the insn of the value. 110 WORD_LENGTH is the length of the word in bits in which the value resides. 111 START is the starting bit number in the word, architecture origin. 112 LENGTH is the length of VALUE in bits. 113 TOTAL_LENGTH is the total length of the insn in bits. 114 115 The result is an error message or NULL if success. */ 116 117 /* ??? This duplicates functionality with bfd's howto table and 118 bfd_install_relocation. */ 119 /* ??? This doesn't handle bfd_vma's. Create another function when 120 necessary. */ 121 122 static const char * 123 insert_normal (CGEN_CPU_DESC cd, 124 long value, 125 unsigned int attrs, 126 unsigned int word_offset, 127 unsigned int start, 128 unsigned int length, 129 unsigned int word_length, 130 unsigned int total_length, 131 CGEN_INSN_BYTES_PTR buffer) 132 { 133 static char errbuf[100]; 134 /* Written this way to avoid undefined behaviour. */ 135 unsigned long mask = (((1L << (length - 1)) - 1) << 1) | 1; 136 137 /* If LENGTH is zero, this operand doesn't contribute to the value. */ 138 if (length == 0) 139 return NULL; 140 141 if (word_length > 8 * sizeof (CGEN_INSN_INT)) 142 abort (); 143 144 /* For architectures with insns smaller than the base-insn-bitsize, 145 word_length may be too big. */ 146 if (cd->min_insn_bitsize < cd->base_insn_bitsize) 147 { 148 if (word_offset == 0 149 && word_length > total_length) 150 word_length = total_length; 151 } 152 153 /* Ensure VALUE will fit. */ 154 if (CGEN_BOOL_ATTR (attrs, CGEN_IFLD_SIGN_OPT)) 155 { 156 long minval = - (1L << (length - 1)); 157 unsigned long maxval = mask; 158 159 if ((value > 0 && (unsigned long) value > maxval) 160 || value < minval) 161 { 162 /* xgettext:c-format */ 163 sprintf (errbuf, 164 _("operand out of range (%ld not between %ld and %lu)"), 165 value, minval, maxval); 166 return errbuf; 167 } 168 } 169 else if (! CGEN_BOOL_ATTR (attrs, CGEN_IFLD_SIGNED)) 170 { 171 unsigned long maxval = mask; 172 unsigned long val = (unsigned long) value; 173 174 /* For hosts with a word size > 32 check to see if value has been sign 175 extended beyond 32 bits. If so then ignore these higher sign bits 176 as the user is attempting to store a 32-bit signed value into an 177 unsigned 32-bit field which is allowed. */ 178 if (sizeof (unsigned long) > 4 && ((value >> 32) == -1)) 179 val &= 0xFFFFFFFF; 180 181 if (val > maxval) 182 { 183 /* xgettext:c-format */ 184 sprintf (errbuf, 185 _("operand out of range (0x%lx not between 0 and 0x%lx)"), 186 val, maxval); 187 return errbuf; 188 } 189 } 190 else 191 { 192 if (! cgen_signed_overflow_ok_p (cd)) 193 { 194 long minval = - (1L << (length - 1)); 195 long maxval = (1L << (length - 1)) - 1; 196 197 if (value < minval || value > maxval) 198 { 199 sprintf 200 /* xgettext:c-format */ 201 (errbuf, _("operand out of range (%ld not between %ld and %ld)"), 202 value, minval, maxval); 203 return errbuf; 204 } 205 } 206 } 207 208 #if CGEN_INT_INSN_P 209 210 { 211 int shift; 212 213 if (CGEN_INSN_LSB0_P) 214 shift = (word_offset + start + 1) - length; 215 else 216 shift = total_length - (word_offset + start + length); 217 *buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift); 218 } 219 220 #else /* ! CGEN_INT_INSN_P */ 221 222 { 223 unsigned char *bufp = (unsigned char *) buffer + word_offset / 8; 224 225 insert_1 (cd, value, start, length, word_length, bufp); 226 } 227 228 #endif /* ! CGEN_INT_INSN_P */ 229 230 return NULL; 231 } 232 233 /* Default insn builder (insert handler). 234 The instruction is recorded in CGEN_INT_INSN_P byte order (meaning 235 that if CGEN_INSN_BYTES_PTR is an int * and thus, the value is 236 recorded in host byte order, otherwise BUFFER is an array of bytes 237 and the value is recorded in target byte order). 238 The result is an error message or NULL if success. */ 239 240 static const char * 241 insert_insn_normal (CGEN_CPU_DESC cd, 242 const CGEN_INSN * insn, 243 CGEN_FIELDS * fields, 244 CGEN_INSN_BYTES_PTR buffer, 245 bfd_vma pc) 246 { 247 const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn); 248 unsigned long value; 249 const CGEN_SYNTAX_CHAR_TYPE * syn; 250 251 CGEN_INIT_INSERT (cd); 252 value = CGEN_INSN_BASE_VALUE (insn); 253 254 /* If we're recording insns as numbers (rather than a string of bytes), 255 target byte order handling is deferred until later. */ 256 257 #if CGEN_INT_INSN_P 258 259 put_insn_int_value (cd, buffer, cd->base_insn_bitsize, 260 CGEN_FIELDS_BITSIZE (fields), value); 261 262 #else 263 264 cgen_put_insn_value (cd, buffer, min ((unsigned) cd->base_insn_bitsize, 265 (unsigned) CGEN_FIELDS_BITSIZE (fields)), 266 value); 267 268 #endif /* ! CGEN_INT_INSN_P */ 269 270 /* ??? It would be better to scan the format's fields. 271 Still need to be able to insert a value based on the operand though; 272 e.g. storing a branch displacement that got resolved later. 273 Needs more thought first. */ 274 275 for (syn = CGEN_SYNTAX_STRING (syntax); * syn; ++ syn) 276 { 277 const char *errmsg; 278 279 if (CGEN_SYNTAX_CHAR_P (* syn)) 280 continue; 281 282 errmsg = (* cd->insert_operand) (cd, CGEN_SYNTAX_FIELD (*syn), 283 fields, buffer, pc); 284 if (errmsg) 285 return errmsg; 286 } 287 288 return NULL; 289 } 290 291 #if CGEN_INT_INSN_P 292 /* Cover function to store an insn value into an integral insn. Must go here 293 because it needs <prefix>-desc.h for CGEN_INT_INSN_P. */ 294 295 static void 296 put_insn_int_value (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED, 297 CGEN_INSN_BYTES_PTR buf, 298 int length, 299 int insn_length, 300 CGEN_INSN_INT value) 301 { 302 /* For architectures with insns smaller than the base-insn-bitsize, 303 length may be too big. */ 304 if (length > insn_length) 305 *buf = value; 306 else 307 { 308 int shift = insn_length - length; 309 /* Written this way to avoid undefined behaviour. */ 310 CGEN_INSN_INT mask = (((1L << (length - 1)) - 1) << 1) | 1; 311 312 *buf = (*buf & ~(mask << shift)) | ((value & mask) << shift); 313 } 314 } 315 #endif 316 317 /* Operand extraction. */ 319 320 #if ! CGEN_INT_INSN_P 321 322 /* Subroutine of extract_normal. 323 Ensure sufficient bytes are cached in EX_INFO. 324 OFFSET is the offset in bytes from the start of the insn of the value. 325 BYTES is the length of the needed value. 326 Returns 1 for success, 0 for failure. */ 327 328 static CGEN_INLINE int 329 fill_cache (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED, 330 CGEN_EXTRACT_INFO *ex_info, 331 int offset, 332 int bytes, 333 bfd_vma pc) 334 { 335 /* It's doubtful that the middle part has already been fetched so 336 we don't optimize that case. kiss. */ 337 unsigned int mask; 338 disassemble_info *info = (disassemble_info *) ex_info->dis_info; 339 340 /* First do a quick check. */ 341 mask = (1 << bytes) - 1; 342 if (((ex_info->valid >> offset) & mask) == mask) 343 return 1; 344 345 /* Search for the first byte we need to read. */ 346 for (mask = 1 << offset; bytes > 0; --bytes, ++offset, mask <<= 1) 347 if (! (mask & ex_info->valid)) 348 break; 349 350 if (bytes) 351 { 352 int status; 353 354 pc += offset; 355 status = (*info->read_memory_func) 356 (pc, ex_info->insn_bytes + offset, bytes, info); 357 358 if (status != 0) 359 { 360 (*info->memory_error_func) (status, pc, info); 361 return 0; 362 } 363 364 ex_info->valid |= ((1 << bytes) - 1) << offset; 365 } 366 367 return 1; 368 } 369 370 /* Subroutine of extract_normal. */ 371 372 static CGEN_INLINE long 373 extract_1 (CGEN_CPU_DESC cd, 374 CGEN_EXTRACT_INFO *ex_info ATTRIBUTE_UNUSED, 375 int start, 376 int length, 377 int word_length, 378 unsigned char *bufp, 379 bfd_vma pc ATTRIBUTE_UNUSED) 380 { 381 unsigned long x; 382 int shift; 383 384 x = cgen_get_insn_value (cd, bufp, word_length); 385 386 if (CGEN_INSN_LSB0_P) 387 shift = (start + 1) - length; 388 else 389 shift = (word_length - (start + length)); 390 return x >> shift; 391 } 392 393 #endif /* ! CGEN_INT_INSN_P */ 394 395 /* Default extraction routine. 396 397 INSN_VALUE is the first base_insn_bitsize bits of the insn in host order, 398 or sometimes less for cases like the m32r where the base insn size is 32 399 but some insns are 16 bits. 400 ATTRS is a mask of the boolean attributes. We only need `SIGNED', 401 but for generality we take a bitmask of all of them. 402 WORD_OFFSET is the offset in bits from the start of the insn of the value. 403 WORD_LENGTH is the length of the word in bits in which the value resides. 404 START is the starting bit number in the word, architecture origin. 405 LENGTH is the length of VALUE in bits. 406 TOTAL_LENGTH is the total length of the insn in bits. 407 408 Returns 1 for success, 0 for failure. */ 409 410 /* ??? The return code isn't properly used. wip. */ 411 412 /* ??? This doesn't handle bfd_vma's. Create another function when 413 necessary. */ 414 415 static int 416 extract_normal (CGEN_CPU_DESC cd, 417 #if ! CGEN_INT_INSN_P 418 CGEN_EXTRACT_INFO *ex_info, 419 #else 420 CGEN_EXTRACT_INFO *ex_info ATTRIBUTE_UNUSED, 421 #endif 422 CGEN_INSN_INT insn_value, 423 unsigned int attrs, 424 unsigned int word_offset, 425 unsigned int start, 426 unsigned int length, 427 unsigned int word_length, 428 unsigned int total_length, 429 #if ! CGEN_INT_INSN_P 430 bfd_vma pc, 431 #else 432 bfd_vma pc ATTRIBUTE_UNUSED, 433 #endif 434 long *valuep) 435 { 436 long value, mask; 437 438 /* If LENGTH is zero, this operand doesn't contribute to the value 439 so give it a standard value of zero. */ 440 if (length == 0) 441 { 442 *valuep = 0; 443 return 1; 444 } 445 446 if (word_length > 8 * sizeof (CGEN_INSN_INT)) 447 abort (); 448 449 /* For architectures with insns smaller than the insn-base-bitsize, 450 word_length may be too big. */ 451 if (cd->min_insn_bitsize < cd->base_insn_bitsize) 452 { 453 if (word_offset + word_length > total_length) 454 word_length = total_length - word_offset; 455 } 456 457 /* Does the value reside in INSN_VALUE, and at the right alignment? */ 458 459 if (CGEN_INT_INSN_P || (word_offset == 0 && word_length == total_length)) 460 { 461 if (CGEN_INSN_LSB0_P) 462 value = insn_value >> ((word_offset + start + 1) - length); 463 else 464 value = insn_value >> (total_length - ( word_offset + start + length)); 465 } 466 467 #if ! CGEN_INT_INSN_P 468 469 else 470 { 471 unsigned char *bufp = ex_info->insn_bytes + word_offset / 8; 472 473 if (word_length > 8 * sizeof (CGEN_INSN_INT)) 474 abort (); 475 476 if (fill_cache (cd, ex_info, word_offset / 8, word_length / 8, pc) == 0) 477 return 0; 478 479 value = extract_1 (cd, ex_info, start, length, word_length, bufp, pc); 480 } 481 482 #endif /* ! CGEN_INT_INSN_P */ 483 484 /* Written this way to avoid undefined behaviour. */ 485 mask = (((1L << (length - 1)) - 1) << 1) | 1; 486 487 value &= mask; 488 /* sign extend? */ 489 if (CGEN_BOOL_ATTR (attrs, CGEN_IFLD_SIGNED) 490 && (value & (1L << (length - 1)))) 491 value |= ~mask; 492 493 *valuep = value; 494 495 return 1; 496 } 497 498 /* Default insn extractor. 499 500 INSN_VALUE is the first base_insn_bitsize bits, translated to host order. 501 The extracted fields are stored in FIELDS. 502 EX_INFO is used to handle reading variable length insns. 503 Return the length of the insn in bits, or 0 if no match, 504 or -1 if an error occurs fetching data (memory_error_func will have 505 been called). */ 506 507 static int 508 extract_insn_normal (CGEN_CPU_DESC cd, 509 const CGEN_INSN *insn, 510 CGEN_EXTRACT_INFO *ex_info, 511 CGEN_INSN_INT insn_value, 512 CGEN_FIELDS *fields, 513 bfd_vma pc) 514 { 515 const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn); 516 const CGEN_SYNTAX_CHAR_TYPE *syn; 517 518 CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn); 519 520 CGEN_INIT_EXTRACT (cd); 521 522 for (syn = CGEN_SYNTAX_STRING (syntax); *syn; ++syn) 523 { 524 int length; 525 526 if (CGEN_SYNTAX_CHAR_P (*syn)) 527 continue; 528 529 length = (* cd->extract_operand) (cd, CGEN_SYNTAX_FIELD (*syn), 530 ex_info, insn_value, fields, pc); 531 if (length <= 0) 532 return length; 533 } 534 535 /* We recognized and successfully extracted this insn. */ 536 return CGEN_INSN_BITSIZE (insn); 537 } 538 539 /* Machine generated code added here. */ 541
