opcodes/fr30-dis.c

   1 /* DO NOT EDIT!  -*- buffer-read-only: t -*- vi:set ro:  */
   2 /* Disassembler interface for targets using CGEN. -*- C -*-
   3    CGEN: Cpu tools GENerator
   4
   5    THIS FILE IS MACHINE GENERATED WITH CGEN.
   6    - the resultant file is machine generated, cgen-dis.in isn't
   7
   8    Copyright (C) 1996-2019 Free Software Foundation, Inc.
   9
  10    This file is part of libopcodes.
  11
  12    This library is free software; you can redistribute it and/or modify
  13    it under the terms of the GNU General Public License as published by
  14    the Free Software Foundation; either version 3, or (at your option)
  15    any later version.
  16
  17    It is distributed in the hope that it will be useful, but WITHOUT
  18    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  19    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  20    License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program; if not, write to the Free Software Foundation, Inc.,
  24    51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  25
  26 /* ??? Eventually more and more of this stuff can go to cpu-independent files.
  27    Keep that in mind.  */
  28
  29 #include "sysdep.h"
  30 #include <stdio.h>
  31 #include "ansidecl.h"
  32 #include "disassemble.h"
  33 #include "bfd.h"
  34 #include "symcat.h"
  35 #include "libiberty.h"
  36 #include "fr30-desc.h"
  37 #include "fr30-opc.h"
  38 #include "opintl.h"
  39
  40 /* Default text to print if an instruction isn't recognized.  */
  41 #define UNKNOWN_INSN_MSG _("*unknown*")
  42
  43 static void print_normal
  44   (CGEN_CPU_DESC, void *, long, unsigned int, bfd_vma, int);
  45 static void print_address
  46   (CGEN_CPU_DESC, void *, bfd_vma, unsigned int, bfd_vma, int) ATTRIBUTE_UNUSED;
  47 static void print_keyword
  48   (CGEN_CPU_DESC, void *, CGEN_KEYWORD *, long, unsigned int) ATTRIBUTE_UNUSED;
  49 static void print_insn_normal
  50   (CGEN_CPU_DESC, void *, const CGEN_INSN *, CGEN_FIELDS *, bfd_vma, int);
  51 static int print_insn
  52   (CGEN_CPU_DESC, bfd_vma,  disassemble_info *, bfd_byte *, unsigned);
  53 static int default_print_insn
  54   (CGEN_CPU_DESC, bfd_vma, disassemble_info *) ATTRIBUTE_UNUSED;
  55 static int read_insn
  56   (CGEN_CPU_DESC, bfd_vma, disassemble_info *, bfd_byte *, int, CGEN_EXTRACT_INFO *,
  57    unsigned long *);
  58 \f
  59 /* -- disassembler routines inserted here.  */
  60
  61 /* -- dis.c */
  62 static void
  63 print_register_list (void * dis_info,
  64                      long value,
  65                      long offset,
  66                      int load_store) /* 0 == load, 1 == store.  */
  67 {
  68   disassemble_info *info = dis_info;
  69   int mask;
  70   int reg_index = 0;
  71   char * comma = "";
  72
  73   if (load_store)
  74     mask = 0x80;
  75   else
  76     mask = 1;
  77
  78   if (value & mask)
  79     {
  80       (*info->fprintf_func) (info->stream, "r%li", reg_index + offset);
  81       comma = ",";
  82     }
  83
  84   for (reg_index = 1; reg_index <= 7; ++reg_index)
  85     {
  86       if (load_store)
  87         mask >>= 1;
  88       else
  89         mask <<= 1;
  90
  91       if (value & mask)
  92         {
  93           (*info->fprintf_func) (info->stream, "%sr%li", comma, reg_index + offset);
  94           comma = ",";
  95         }
  96     }
  97 }
  98
  99 static void
 100 print_hi_register_list_ld (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 101                            void * dis_info,
 102                            long value,
 103                            unsigned int attrs ATTRIBUTE_UNUSED,
 104                            bfd_vma pc ATTRIBUTE_UNUSED,
 105                            int length ATTRIBUTE_UNUSED)
 106 {
 107   print_register_list (dis_info, value, 8, 0 /* Load.  */);
 108 }
 109
 110 static void
 111 print_low_register_list_ld (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 112                             void * dis_info,
 113                             long value,
 114                             unsigned int attrs ATTRIBUTE_UNUSED,
 115                             bfd_vma pc ATTRIBUTE_UNUSED,
 116                             int length ATTRIBUTE_UNUSED)
 117 {
 118   print_register_list (dis_info, value, 0, 0 /* Load.  */);
 119 }
 120
 121 static void
 122 print_hi_register_list_st (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 123                            void * dis_info,
 124                            long value,
 125                            unsigned int attrs ATTRIBUTE_UNUSED,
 126                            bfd_vma pc ATTRIBUTE_UNUSED,
 127                            int length ATTRIBUTE_UNUSED)
 128 {
 129   print_register_list (dis_info, value, 8, 1 /* Store.  */);
 130 }
 131
 132 static void
 133 print_low_register_list_st (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 134                             void * dis_info,
 135                             long value,
 136                             unsigned int attrs ATTRIBUTE_UNUSED,
 137                             bfd_vma pc ATTRIBUTE_UNUSED,
 138                             int length ATTRIBUTE_UNUSED)
 139 {
 140   print_register_list (dis_info, value, 0, 1 /* Store.  */);
 141 }
 142
 143 static void
 144 print_m4 (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 145           void * dis_info,
 146           long value,
 147           unsigned int attrs ATTRIBUTE_UNUSED,
 148           bfd_vma pc ATTRIBUTE_UNUSED,
 149           int length ATTRIBUTE_UNUSED)
 150 {
 151   disassemble_info *info = (disassemble_info *) dis_info;
 152
 153   (*info->fprintf_func) (info->stream, "%ld", value);
 154 }
 155 /* -- */
 156
 157 void fr30_cgen_print_operand
 158   (CGEN_CPU_DESC, int, PTR, CGEN_FIELDS *, void const *, bfd_vma, int);
 159
 160 /* Main entry point for printing operands.
 161    XINFO is a `void *' and not a `disassemble_info *' to not put a requirement
 162    of dis-asm.h on cgen.h.
 163
 164    This function is basically just a big switch statement.  Earlier versions
 165    used tables to look up the function to use, but
 166    - if the table contains both assembler and disassembler functions then
 167      the disassembler contains much of the assembler and vice-versa,
 168    - there's a lot of inlining possibilities as things grow,
 169    - using a switch statement avoids the function call overhead.
 170
 171    This function could be moved into `print_insn_normal', but keeping it
 172    separate makes clear the interface between `print_insn_normal' and each of
 173    the handlers.  */
 174
 175 void
 176 fr30_cgen_print_operand (CGEN_CPU_DESC cd,
 177                            int opindex,
 178                            void * xinfo,
 179                            CGEN_FIELDS *fields,
 180                            void const *attrs ATTRIBUTE_UNUSED,
 181                            bfd_vma pc,
 182                            int length)
 183 {
 184   disassemble_info *info = (disassemble_info *) xinfo;
 185
 186   switch (opindex)
 187     {
 188     case FR30_OPERAND_CRI :
 189       print_keyword (cd, info, & fr30_cgen_opval_cr_names, fields->f_CRi, 0);
 190       break;
 191     case FR30_OPERAND_CRJ :
 192       print_keyword (cd, info, & fr30_cgen_opval_cr_names, fields->f_CRj, 0);
 193       break;
 194     case FR30_OPERAND_R13 :
 195       print_keyword (cd, info, & fr30_cgen_opval_h_r13, 0, 0);
 196       break;
 197     case FR30_OPERAND_R14 :
 198       print_keyword (cd, info, & fr30_cgen_opval_h_r14, 0, 0);
 199       break;
 200     case FR30_OPERAND_R15 :
 201       print_keyword (cd, info, & fr30_cgen_opval_h_r15, 0, 0);
 202       break;
 203     case FR30_OPERAND_RI :
 204       print_keyword (cd, info, & fr30_cgen_opval_gr_names, fields->f_Ri, 0);
 205       break;
 206     case FR30_OPERAND_RIC :
 207       print_keyword (cd, info, & fr30_cgen_opval_gr_names, fields->f_Ric, 0);
 208       break;
 209     case FR30_OPERAND_RJ :
 210       print_keyword (cd, info, & fr30_cgen_opval_gr_names, fields->f_Rj, 0);
 211       break;
 212     case FR30_OPERAND_RJC :
 213       print_keyword (cd, info, & fr30_cgen_opval_gr_names, fields->f_Rjc, 0);
 214       break;
 215     case FR30_OPERAND_RS1 :
 216       print_keyword (cd, info, & fr30_cgen_opval_dr_names, fields->f_Rs1, 0);
 217       break;
 218     case FR30_OPERAND_RS2 :
 219       print_keyword (cd, info, & fr30_cgen_opval_dr_names, fields->f_Rs2, 0);
 220       break;
 221     case FR30_OPERAND_CC :
 222       print_normal (cd, info, fields->f_cc, 0, pc, length);
 223       break;
 224     case FR30_OPERAND_CCC :
 225       print_normal (cd, info, fields->f_ccc, 0|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
 226       break;
 227     case FR30_OPERAND_DIR10 :
 228       print_normal (cd, info, fields->f_dir10, 0, pc, length);
 229       break;
 230     case FR30_OPERAND_DIR8 :
 231       print_normal (cd, info, fields->f_dir8, 0, pc, length);
 232       break;
 233     case FR30_OPERAND_DIR9 :
 234       print_normal (cd, info, fields->f_dir9, 0, pc, length);
 235       break;
 236     case FR30_OPERAND_DISP10 :
 237       print_normal (cd, info, fields->f_disp10, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
 238       break;
 239     case FR30_OPERAND_DISP8 :
 240       print_normal (cd, info, fields->f_disp8, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
 241       break;
 242     case FR30_OPERAND_DISP9 :
 243       print_normal (cd, info, fields->f_disp9, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
 244       break;
 245     case FR30_OPERAND_I20 :
 246       print_normal (cd, info, fields->f_i20, 0|(1<<CGEN_OPERAND_HASH_PREFIX)|(1<<CGEN_OPERAND_VIRTUAL), pc, length);
 247       break;
 248     case FR30_OPERAND_I32 :
 249       print_normal (cd, info, fields->f_i32, 0|(1<<CGEN_OPERAND_HASH_PREFIX)|(1<<CGEN_OPERAND_SIGN_OPT), pc, length);
 250       break;
 251     case FR30_OPERAND_I8 :
 252       print_normal (cd, info, fields->f_i8, 0|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
 253       break;
 254     case FR30_OPERAND_LABEL12 :
 255       print_address (cd, info, fields->f_rel12, 0|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
 256       break;
 257     case FR30_OPERAND_LABEL9 :
 258       print_address (cd, info, fields->f_rel9, 0|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
 259       break;
 260     case FR30_OPERAND_M4 :
 261       print_m4 (cd, info, fields->f_m4, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
 262       break;
 263     case FR30_OPERAND_PS :
 264       print_keyword (cd, info, & fr30_cgen_opval_h_ps, 0, 0);
 265       break;
 266     case FR30_OPERAND_REGLIST_HI_LD :
 267       print_hi_register_list_ld (cd, info, fields->f_reglist_hi_ld, 0, pc, length);
 268       break;
 269     case FR30_OPERAND_REGLIST_HI_ST :
 270       print_hi_register_list_st (cd, info, fields->f_reglist_hi_st, 0, pc, length);
 271       break;
 272     case FR30_OPERAND_REGLIST_LOW_LD :
 273       print_low_register_list_ld (cd, info, fields->f_reglist_low_ld, 0, pc, length);
 274       break;
 275     case FR30_OPERAND_REGLIST_LOW_ST :
 276       print_low_register_list_st (cd, info, fields->f_reglist_low_st, 0, pc, length);
 277       break;
 278     case FR30_OPERAND_S10 :
 279       print_normal (cd, info, fields->f_s10, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
 280       break;
 281     case FR30_OPERAND_U10 :
 282       print_normal (cd, info, fields->f_u10, 0|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
 283       break;
 284     case FR30_OPERAND_U4 :
 285       print_normal (cd, info, fields->f_u4, 0|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
 286       break;
 287     case FR30_OPERAND_U4C :
 288       print_normal (cd, info, fields->f_u4c, 0|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
 289       break;
 290     case FR30_OPERAND_U8 :
 291       print_normal (cd, info, fields->f_u8, 0|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
 292       break;
 293     case FR30_OPERAND_UDISP6 :
 294       print_normal (cd, info, fields->f_udisp6, 0|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
 295       break;
 296
 297     default :
 298       /* xgettext:c-format */
 299       opcodes_error_handler
 300         (_("internal error: unrecognized field %d while printing insn"),
 301          opindex);
 302       abort ();
 303   }
 304 }
 305
 306 cgen_print_fn * const fr30_cgen_print_handlers[] =
 307 {
 308   print_insn_normal,
 309 };
 310
 311
 312 void
 313 fr30_cgen_init_dis (CGEN_CPU_DESC cd)
 314 {
 315   fr30_cgen_init_opcode_table (cd);
 316   fr30_cgen_init_ibld_table (cd);
 317   cd->print_handlers = & fr30_cgen_print_handlers[0];
 318   cd->print_operand = fr30_cgen_print_operand;
 319 }
 320
 321 \f
 322 /* Default print handler.  */
 323
 324 static void
 325 print_normal (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 326               void *dis_info,
 327               long value,
 328               unsigned int attrs,
 329               bfd_vma pc ATTRIBUTE_UNUSED,
 330               int length ATTRIBUTE_UNUSED)
 331 {
 332   disassemble_info *info = (disassemble_info *) dis_info;
 333
 334   /* Print the operand as directed by the attributes.  */
 335   if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
 336     ; /* nothing to do */
 337   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
 338     (*info->fprintf_func) (info->stream, "%ld", value);
 339   else
 340     (*info->fprintf_func) (info->stream, "0x%lx", value);
 341 }
 342
 343 /* Default address handler.  */
 344
 345 static void
 346 print_address (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 347                void *dis_info,
 348                bfd_vma value,
 349                unsigned int attrs,
 350                bfd_vma pc ATTRIBUTE_UNUSED,
 351                int length ATTRIBUTE_UNUSED)
 352 {
 353   disassemble_info *info = (disassemble_info *) dis_info;
 354
 355   /* Print the operand as directed by the attributes.  */
 356   if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
 357     ; /* Nothing to do.  */
 358   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_PCREL_ADDR))
 359     (*info->print_address_func) (value, info);
 360   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_ABS_ADDR))
 361     (*info->print_address_func) (value, info);
 362   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
 363     (*info->fprintf_func) (info->stream, "%ld", (long) value);
 364   else
 365     (*info->fprintf_func) (info->stream, "0x%lx", (long) value);
 366 }
 367
 368 /* Keyword print handler.  */
 369
 370 static void
 371 print_keyword (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 372                void *dis_info,
 373                CGEN_KEYWORD *keyword_table,
 374                long value,
 375                unsigned int attrs ATTRIBUTE_UNUSED)
 376 {
 377   disassemble_info *info = (disassemble_info *) dis_info;
 378   const CGEN_KEYWORD_ENTRY *ke;
 379
 380   ke = cgen_keyword_lookup_value (keyword_table, value);
 381   if (ke != NULL)
 382     (*info->fprintf_func) (info->stream, "%s", ke->name);
 383   else
 384     (*info->fprintf_func) (info->stream, "???");
 385 }
 386 \f
 387 /* Default insn printer.
 388
 389    DIS_INFO is defined as `void *' so the disassembler needn't know anything
 390    about disassemble_info.  */
 391
 392 static void
 393 print_insn_normal (CGEN_CPU_DESC cd,
 394                    void *dis_info,
 395                    const CGEN_INSN *insn,
 396                    CGEN_FIELDS *fields,
 397                    bfd_vma pc,
 398                    int length)
 399 {
 400   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 401   disassemble_info *info = (disassemble_info *) dis_info;
 402   const CGEN_SYNTAX_CHAR_TYPE *syn;
 403
 404   CGEN_INIT_PRINT (cd);
 405
 406   for (syn = CGEN_SYNTAX_STRING (syntax); *syn; ++syn)
 407     {
 408       if (CGEN_SYNTAX_MNEMONIC_P (*syn))
 409         {
 410           (*info->fprintf_func) (info->stream, "%s", CGEN_INSN_MNEMONIC (insn));
 411           continue;
 412         }
 413       if (CGEN_SYNTAX_CHAR_P (*syn))
 414         {
 415           (*info->fprintf_func) (info->stream, "%c", CGEN_SYNTAX_CHAR (*syn));
 416           continue;
 417         }
 418
 419       /* We have an operand.  */
 420       fr30_cgen_print_operand (cd, CGEN_SYNTAX_FIELD (*syn), info,
 421                                  fields, CGEN_INSN_ATTRS (insn), pc, length);
 422     }
 423 }
 424 \f
 425 /* Subroutine of print_insn. Reads an insn into the given buffers and updates
 426    the extract info.
 427    Returns 0 if all is well, non-zero otherwise.  */
 428
 429 static int
 430 read_insn (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 431            bfd_vma pc,
 432            disassemble_info *info,
 433            bfd_byte *buf,
 434            int buflen,
 435            CGEN_EXTRACT_INFO *ex_info,
 436            unsigned long *insn_value)
 437 {
 438   int status = (*info->read_memory_func) (pc, buf, buflen, info);
 439
 440   if (status != 0)
 441     {
 442       (*info->memory_error_func) (status, pc, info);
 443       return -1;
 444     }
 445
 446   ex_info->dis_info = info;
 447   ex_info->valid = (1 << buflen) - 1;
 448   ex_info->insn_bytes = buf;
 449
 450   *insn_value = bfd_get_bits (buf, buflen * 8, info->endian == BFD_ENDIAN_BIG);
 451   return 0;
 452 }
 453
 454 /* Utility to print an insn.
 455    BUF is the base part of the insn, target byte order, BUFLEN bytes long.
 456    The result is the size of the insn in bytes or zero for an unknown insn
 457    or -1 if an error occurs fetching data (memory_error_func will have
 458    been called).  */
 459
 460 static int
 461 print_insn (CGEN_CPU_DESC cd,
 462             bfd_vma pc,
 463             disassemble_info *info,
 464             bfd_byte *buf,
 465             unsigned int buflen)
 466 {
 467   CGEN_INSN_INT insn_value;
 468   const CGEN_INSN_LIST *insn_list;
 469   CGEN_EXTRACT_INFO ex_info;
 470   int basesize;
 471
 472   /* Extract base part of instruction, just in case CGEN_DIS_* uses it. */
 473   basesize = cd->base_insn_bitsize < buflen * 8 ?
 474                                      cd->base_insn_bitsize : buflen * 8;
 475   insn_value = cgen_get_insn_value (cd, buf, basesize);
 476
 477
 478   /* Fill in ex_info fields like read_insn would.  Don't actually call
 479      read_insn, since the incoming buffer is already read (and possibly
 480      modified a la m32r).  */
 481   ex_info.valid = (1 << buflen) - 1;
 482   ex_info.dis_info = info;
 483   ex_info.insn_bytes = buf;
 484
 485   /* The instructions are stored in hash lists.
 486      Pick the first one and keep trying until we find the right one.  */
 487
 488   insn_list = CGEN_DIS_LOOKUP_INSN (cd, (char *) buf, insn_value);
 489   while (insn_list != NULL)
 490     {
 491       const CGEN_INSN *insn = insn_list->insn;
 492       CGEN_FIELDS fields;
 493       int length;
 494       unsigned long insn_value_cropped;
 495
 496 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 497       /* Not needed as insn shouldn't be in hash lists if not supported.  */
 498       /* Supported by this cpu?  */
 499       if (! fr30_cgen_insn_supported (cd, insn))
 500         {
 501           insn_list = CGEN_DIS_NEXT_INSN (insn_list);
 502           continue;
 503         }
 504 #endif
 505
 506       /* Basic bit mask must be correct.  */
 507       /* ??? May wish to allow target to defer this check until the extract
 508          handler.  */
 509
 510       /* Base size may exceed this instruction's size.  Extract the
 511          relevant part from the buffer. */
 512       if ((unsigned) (CGEN_INSN_BITSIZE (insn) / 8) < buflen &&
 513           (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
 514         insn_value_cropped = bfd_get_bits (buf, CGEN_INSN_BITSIZE (insn),
 515                                            info->endian == BFD_ENDIAN_BIG);
 516       else
 517         insn_value_cropped = insn_value;
 518
 519       if ((insn_value_cropped & CGEN_INSN_BASE_MASK (insn))
 520           == CGEN_INSN_BASE_VALUE (insn))
 521         {
 522           /* Printing is handled in two passes.  The first pass parses the
 523              machine insn and extracts the fields.  The second pass prints
 524              them.  */
 525
 526           /* Make sure the entire insn is loaded into insn_value, if it
 527              can fit.  */
 528           if (((unsigned) CGEN_INSN_BITSIZE (insn) > cd->base_insn_bitsize) &&
 529               (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
 530             {
 531               unsigned long full_insn_value;
 532               int rc = read_insn (cd, pc, info, buf,
 533                                   CGEN_INSN_BITSIZE (insn) / 8,
 534                                   & ex_info, & full_insn_value);
 535               if (rc != 0)
 536                 return rc;
 537               length = CGEN_EXTRACT_FN (cd, insn)
 538                 (cd, insn, &ex_info, full_insn_value, &fields, pc);
 539             }
 540           else
 541             length = CGEN_EXTRACT_FN (cd, insn)
 542               (cd, insn, &ex_info, insn_value_cropped, &fields, pc);
 543
 544           /* Length < 0 -> error.  */
 545           if (length < 0)
 546             return length;
 547           if (length > 0)
 548             {
 549               CGEN_PRINT_FN (cd, insn) (cd, info, insn, &fields, pc, length);
 550               /* Length is in bits, result is in bytes.  */
 551               return length / 8;
 552             }
 553         }
 554
 555       insn_list = CGEN_DIS_NEXT_INSN (insn_list);
 556     }
 557
 558   return 0;
 559 }
 560
 561 /* Default value for CGEN_PRINT_INSN.
 562    The result is the size of the insn in bytes or zero for an unknown insn
 563    or -1 if an error occured fetching bytes.  */
 564
 565 #ifndef CGEN_PRINT_INSN
 566 #define CGEN_PRINT_INSN default_print_insn
 567 #endif
 568
 569 static int
 570 default_print_insn (CGEN_CPU_DESC cd, bfd_vma pc, disassemble_info *info)
 571 {
 572   bfd_byte buf[CGEN_MAX_INSN_SIZE];
 573   int buflen;
 574   int status;
 575
 576   /* Attempt to read the base part of the insn.  */
 577   buflen = cd->base_insn_bitsize / 8;
 578   status = (*info->read_memory_func) (pc, buf, buflen, info);
 579
 580   /* Try again with the minimum part, if min < base.  */
 581   if (status != 0 && (cd->min_insn_bitsize < cd->base_insn_bitsize))
 582     {
 583       buflen = cd->min_insn_bitsize / 8;
 584       status = (*info->read_memory_func) (pc, buf, buflen, info);
 585     }
 586
 587   if (status != 0)
 588     {
 589       (*info->memory_error_func) (status, pc, info);
 590       return -1;
 591     }
 592
 593   return print_insn (cd, pc, info, buf, buflen);
 594 }
 595
 596 /* Main entry point.
 597    Print one instruction from PC on INFO->STREAM.
 598    Return the size of the instruction (in bytes).  */
 599
 600 typedef struct cpu_desc_list
 601 {
 602   struct cpu_desc_list *next;
 603   CGEN_BITSET *isa;
 604   int mach;
 605   int endian;
 606   CGEN_CPU_DESC cd;
 607 } cpu_desc_list;
 608
 609 int
 610 print_insn_fr30 (bfd_vma pc, disassemble_info *info)
 611 {
 612   static cpu_desc_list *cd_list = 0;
 613   cpu_desc_list *cl = 0;
 614   static CGEN_CPU_DESC cd = 0;
 615   static CGEN_BITSET *prev_isa;
 616   static int prev_mach;
 617   static int prev_endian;
 618   int length;
 619   CGEN_BITSET *isa;
 620   int mach;
 621   int endian = (info->endian == BFD_ENDIAN_BIG
 622                 ? CGEN_ENDIAN_BIG
 623                 : CGEN_ENDIAN_LITTLE);
 624   enum bfd_architecture arch;
 625
 626   /* ??? gdb will set mach but leave the architecture as "unknown" */
 627 #ifndef CGEN_BFD_ARCH
 628 #define CGEN_BFD_ARCH bfd_arch_fr30
 629 #endif
 630   arch = info->arch;
 631   if (arch == bfd_arch_unknown)
 632     arch = CGEN_BFD_ARCH;
 633
 634   /* There's no standard way to compute the machine or isa number
 635      so we leave it to the target.  */
 636 #ifdef CGEN_COMPUTE_MACH
 637   mach = CGEN_COMPUTE_MACH (info);
 638 #else
 639   mach = info->mach;
 640 #endif
 641
 642 #ifdef CGEN_COMPUTE_ISA
 643   {
 644     static CGEN_BITSET *permanent_isa;
 645
 646     if (!permanent_isa)
 647       permanent_isa = cgen_bitset_create (MAX_ISAS);
 648     isa = permanent_isa;
 649     cgen_bitset_clear (isa);
 650     cgen_bitset_add (isa, CGEN_COMPUTE_ISA (info));
 651   }
 652 #else
 653   isa = info->private_data;
 654 #endif
 655
 656   /* If we've switched cpu's, try to find a handle we've used before */
 657   if (cd
 658       && (cgen_bitset_compare (isa, prev_isa) != 0
 659           || mach != prev_mach
 660           || endian != prev_endian))
 661     {
 662       cd = 0;
 663       for (cl = cd_list; cl; cl = cl->next)
 664         {
 665           if (cgen_bitset_compare (cl->isa, isa) == 0 &&
 666               cl->mach == mach &&
 667               cl->endian == endian)
 668             {
 669               cd = cl->cd;
 670               prev_isa = cd->isas;
 671               break;
 672             }
 673         }
 674     }
 675
 676   /* If we haven't initialized yet, initialize the opcode table.  */
 677   if (! cd)
 678     {
 679       const bfd_arch_info_type *arch_type = bfd_lookup_arch (arch, mach);
 680       const char *mach_name;
 681
 682       if (!arch_type)
 683         abort ();
 684       mach_name = arch_type->printable_name;
 685
 686       prev_isa = cgen_bitset_copy (isa);
 687       prev_mach = mach;
 688       prev_endian = endian;
 689       cd = fr30_cgen_cpu_open (CGEN_CPU_OPEN_ISAS, prev_isa,
 690                                  CGEN_CPU_OPEN_BFDMACH, mach_name,
 691                                  CGEN_CPU_OPEN_ENDIAN, prev_endian,
 692                                  CGEN_CPU_OPEN_END);
 693       if (!cd)
 694         abort ();
 695
 696       /* Save this away for future reference.  */
 697       cl = xmalloc (sizeof (struct cpu_desc_list));
 698       cl->cd = cd;
 699       cl->isa = prev_isa;
 700       cl->mach = mach;
 701       cl->endian = endian;
 702       cl->next = cd_list;
 703       cd_list = cl;
 704
 705       fr30_cgen_init_dis (cd);
 706     }
 707
 708   /* We try to have as much common code as possible.
 709      But at this point some targets need to take over.  */
 710   /* ??? Some targets may need a hook elsewhere.  Try to avoid this,
 711      but if not possible try to move this hook elsewhere rather than
 712      have two hooks.  */
 713   length = CGEN_PRINT_INSN (cd, pc, info);
 714   if (length > 0)
 715     return length;
 716   if (length < 0)
 717     return -1;
 718
 719   (*info->fprintf_func) (info->stream, UNKNOWN_INSN_MSG);
 720   return cd->default_insn_bitsize / 8;
 721 }