opcodes/ip2k-dis.c

   1 /* Disassembler interface for targets using CGEN. -*- C -*-
   2    CGEN: Cpu tools GENerator
   3
   4    THIS FILE IS MACHINE GENERATED WITH CGEN.
   5    - the resultant file is machine generated, cgen-dis.in isn't
   6
   7    Copyright (C) 1996-2015 Free Software Foundation, Inc.
   8
   9    This file is part of libopcodes.
  10
  11    This library is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3, or (at your option)
  14    any later version.
  15
  16    It is distributed in the hope that it will be useful, but WITHOUT
  17    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  18    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  19    License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program; if not, write to the Free Software Foundation, Inc.,
  23    51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  24
  25 /* ??? Eventually more and more of this stuff can go to cpu-independent files.
  26    Keep that in mind.  */
  27
  28 #include "sysdep.h"
  29 #include <stdio.h>
  30 #include "ansidecl.h"
  31 #include "dis-asm.h"
  32 #include "bfd.h"
  33 #include "symcat.h"
  34 #include "libiberty.h"
  35 #include "ip2k-desc.h"
  36 #include "ip2k-opc.h"
  37 #include "opintl.h"
  38
  39 /* Default text to print if an instruction isn't recognized.  */
  40 #define UNKNOWN_INSN_MSG _("*unknown*")
  41
  42 static void print_normal
  43   (CGEN_CPU_DESC, void *, long, unsigned int, bfd_vma, int);
  44 static void print_address
  45   (CGEN_CPU_DESC, void *, bfd_vma, unsigned int, bfd_vma, int) ATTRIBUTE_UNUSED;
  46 static void print_keyword
  47   (CGEN_CPU_DESC, void *, CGEN_KEYWORD *, long, unsigned int) ATTRIBUTE_UNUSED;
  48 static void print_insn_normal
  49   (CGEN_CPU_DESC, void *, const CGEN_INSN *, CGEN_FIELDS *, bfd_vma, int);
  50 static int print_insn
  51   (CGEN_CPU_DESC, bfd_vma,  disassemble_info *, bfd_byte *, unsigned);
  52 static int default_print_insn
  53   (CGEN_CPU_DESC, bfd_vma, disassemble_info *) ATTRIBUTE_UNUSED;
  54 static int read_insn
  55   (CGEN_CPU_DESC, bfd_vma, disassemble_info *, bfd_byte *, int, CGEN_EXTRACT_INFO *,
  56    unsigned long *);
  57 \f
  58 /* -- disassembler routines inserted here.  */
  59
  60 /* -- dis.c */
  61
  62 static void
  63 print_fr (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
  64           void * dis_info,
  65           long value,
  66           unsigned int attrs ATTRIBUTE_UNUSED,
  67           bfd_vma pc ATTRIBUTE_UNUSED,
  68           int length ATTRIBUTE_UNUSED)
  69 {
  70   disassemble_info *info = (disassemble_info *) dis_info;
  71   const CGEN_KEYWORD_ENTRY *ke;
  72   extern CGEN_KEYWORD ip2k_cgen_opval_register_names;
  73   long offsettest;
  74   long offsetvalue;
  75
  76   if (value == 0) /* This is (IP).  */
  77     {
  78       (*info->fprintf_func) (info->stream, "%s", "(IP)");
  79       return;
  80     }
  81
  82   offsettest = value >> 7;
  83   offsetvalue = value & 0x7F;
  84
  85   /* Check to see if first two bits are 10 -> (DP).  */
  86   if (offsettest == 2)
  87     {
  88       if (offsetvalue == 0)
  89         (*info->fprintf_func) (info->stream, "%s","(DP)");
  90       else
  91         (*info->fprintf_func) (info->stream, "$%lx%s", offsetvalue, "(DP)");
  92       return;
  93     }
  94
  95   /* Check to see if first two bits are 11 -> (SP).  */
  96   if (offsettest == 3)
  97     {
  98       if (offsetvalue == 0)
  99         (*info->fprintf_func) (info->stream, "%s", "(SP)");
 100       else
 101         (*info->fprintf_func) (info->stream, "$%lx%s", offsetvalue,"(SP)");
 102       return;
 103     }
 104
 105   /* Attempt to print as a register keyword.  */
 106   ke = cgen_keyword_lookup_value (& ip2k_cgen_opval_register_names, value);
 107
 108   if (ke != NULL)
 109     (*info->fprintf_func) (info->stream, "%s", ke->name);
 110   else
 111     /* Print as an address literal.  */
 112     (*info->fprintf_func) (info->stream, "$%02lx", value);
 113 }
 114
 115 static void
 116 print_dollarhex (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 117                  void * dis_info,
 118                  long value,
 119                  unsigned int attrs ATTRIBUTE_UNUSED,
 120                  bfd_vma pc ATTRIBUTE_UNUSED,
 121                  int length ATTRIBUTE_UNUSED)
 122 {
 123   disassemble_info *info = (disassemble_info *) dis_info;
 124
 125   (*info->fprintf_func) (info->stream, "$%lx", value);
 126 }
 127
 128 static void
 129 print_dollarhex8 (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 130                   void * dis_info,
 131                   long value,
 132                   unsigned int attrs ATTRIBUTE_UNUSED,
 133                   bfd_vma pc ATTRIBUTE_UNUSED,
 134                   int length ATTRIBUTE_UNUSED)
 135 {
 136   disassemble_info *info = (disassemble_info *) dis_info;
 137
 138   (*info->fprintf_func) (info->stream, "$%02lx", value);
 139 }
 140
 141 static void
 142 print_dollarhex_addr16h (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 143                          void * dis_info,
 144                          long value,
 145                          unsigned int attrs ATTRIBUTE_UNUSED,
 146                          bfd_vma pc ATTRIBUTE_UNUSED,
 147                          int length ATTRIBUTE_UNUSED)
 148 {
 149   disassemble_info *info = (disassemble_info *) dis_info;
 150
 151   /* This is a loadh instruction. Shift the value to the left
 152      by 8 bits so that disassembled code will reassemble properly.  */
 153   value = ((value << 8) & 0xFF00);
 154
 155   (*info->fprintf_func) (info->stream, "$%04lx", value);
 156 }
 157
 158 static void
 159 print_dollarhex_addr16l (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 160                          void * dis_info,
 161                          long value,
 162                          unsigned int attrs ATTRIBUTE_UNUSED,
 163                          bfd_vma pc ATTRIBUTE_UNUSED,
 164                          int length ATTRIBUTE_UNUSED)
 165 {
 166   disassemble_info *info = (disassemble_info *) dis_info;
 167
 168   (*info->fprintf_func) (info->stream, "$%04lx", value);
 169 }
 170
 171 static void
 172 print_dollarhex_p (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 173                    void * dis_info,
 174                    long value,
 175                    unsigned int attrs ATTRIBUTE_UNUSED,
 176                    bfd_vma pc ATTRIBUTE_UNUSED,
 177                    int length ATTRIBUTE_UNUSED)
 178 {
 179   disassemble_info *info = (disassemble_info *) dis_info;
 180
 181   value = ((value << 14) & 0x1C000);
 182   ;value = (value  & 0x1FFFF);
 183   (*info->fprintf_func) (info->stream, "$%05lx", value);
 184 }
 185
 186 static void
 187 print_dollarhex_cj (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 188                     void * dis_info,
 189                     long value,
 190                     unsigned int attrs ATTRIBUTE_UNUSED,
 191                     bfd_vma pc ATTRIBUTE_UNUSED,
 192                     int length ATTRIBUTE_UNUSED)
 193 {
 194   disassemble_info *info = (disassemble_info *) dis_info;
 195
 196   value = ((value << 1) & 0x1FFFF);
 197   (*info->fprintf_func) (info->stream, "$%05lx", value);
 198 }
 199
 200 static void
 201 print_decimal (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 202                void * dis_info,
 203                long value,
 204                unsigned int attrs ATTRIBUTE_UNUSED,
 205                bfd_vma pc ATTRIBUTE_UNUSED,
 206                int length ATTRIBUTE_UNUSED)
 207 {
 208   disassemble_info *info = (disassemble_info *) dis_info;
 209
 210   (*info->fprintf_func) (info->stream, "%ld", value);
 211 }
 212
 213
 214
 215 /* -- */
 216
 217 void ip2k_cgen_print_operand
 218   (CGEN_CPU_DESC, int, PTR, CGEN_FIELDS *, void const *, bfd_vma, int);
 219
 220 /* Main entry point for printing operands.
 221    XINFO is a `void *' and not a `disassemble_info *' to not put a requirement
 222    of dis-asm.h on cgen.h.
 223
 224    This function is basically just a big switch statement.  Earlier versions
 225    used tables to look up the function to use, but
 226    - if the table contains both assembler and disassembler functions then
 227      the disassembler contains much of the assembler and vice-versa,
 228    - there's a lot of inlining possibilities as things grow,
 229    - using a switch statement avoids the function call overhead.
 230
 231    This function could be moved into `print_insn_normal', but keeping it
 232    separate makes clear the interface between `print_insn_normal' and each of
 233    the handlers.  */
 234
 235 void
 236 ip2k_cgen_print_operand (CGEN_CPU_DESC cd,
 237                            int opindex,
 238                            void * xinfo,
 239                            CGEN_FIELDS *fields,
 240                            void const *attrs ATTRIBUTE_UNUSED,
 241                            bfd_vma pc,
 242                            int length)
 243 {
 244   disassemble_info *info = (disassemble_info *) xinfo;
 245
 246   switch (opindex)
 247     {
 248     case IP2K_OPERAND_ADDR16CJP :
 249       print_dollarhex_cj (cd, info, fields->f_addr16cjp, 0|(1<<CGEN_OPERAND_ABS_ADDR), pc, length);
 250       break;
 251     case IP2K_OPERAND_ADDR16H :
 252       print_dollarhex_addr16h (cd, info, fields->f_imm8, 0, pc, length);
 253       break;
 254     case IP2K_OPERAND_ADDR16L :
 255       print_dollarhex_addr16l (cd, info, fields->f_imm8, 0, pc, length);
 256       break;
 257     case IP2K_OPERAND_ADDR16P :
 258       print_dollarhex_p (cd, info, fields->f_page3, 0, pc, length);
 259       break;
 260     case IP2K_OPERAND_BITNO :
 261       print_decimal (cd, info, fields->f_bitno, 0, pc, length);
 262       break;
 263     case IP2K_OPERAND_CBIT :
 264       print_normal (cd, info, 0, 0, pc, length);
 265       break;
 266     case IP2K_OPERAND_DCBIT :
 267       print_normal (cd, info, 0, 0, pc, length);
 268       break;
 269     case IP2K_OPERAND_FR :
 270       print_fr (cd, info, fields->f_reg, 0|(1<<CGEN_OPERAND_ABS_ADDR), pc, length);
 271       break;
 272     case IP2K_OPERAND_LIT8 :
 273       print_dollarhex8 (cd, info, fields->f_imm8, 0|(1<<CGEN_OPERAND_SIGNED), pc, length);
 274       break;
 275     case IP2K_OPERAND_PABITS :
 276       print_normal (cd, info, 0, 0, pc, length);
 277       break;
 278     case IP2K_OPERAND_RETI3 :
 279       print_dollarhex (cd, info, fields->f_reti3, 0, pc, length);
 280       break;
 281     case IP2K_OPERAND_ZBIT :
 282       print_normal (cd, info, 0, 0, pc, length);
 283       break;
 284
 285     default :
 286       /* xgettext:c-format */
 287       fprintf (stderr, _("Unrecognized field %d while printing insn.\n"),
 288                opindex);
 289     abort ();
 290   }
 291 }
 292
 293 cgen_print_fn * const ip2k_cgen_print_handlers[] =
 294 {
 295   print_insn_normal,
 296 };
 297
 298
 299 void
 300 ip2k_cgen_init_dis (CGEN_CPU_DESC cd)
 301 {
 302   ip2k_cgen_init_opcode_table (cd);
 303   ip2k_cgen_init_ibld_table (cd);
 304   cd->print_handlers = & ip2k_cgen_print_handlers[0];
 305   cd->print_operand = ip2k_cgen_print_operand;
 306 }
 307
 308 \f
 309 /* Default print handler.  */
 310
 311 static void
 312 print_normal (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 313               void *dis_info,
 314               long value,
 315               unsigned int attrs,
 316               bfd_vma pc ATTRIBUTE_UNUSED,
 317               int length ATTRIBUTE_UNUSED)
 318 {
 319   disassemble_info *info = (disassemble_info *) dis_info;
 320
 321   /* Print the operand as directed by the attributes.  */
 322   if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
 323     ; /* nothing to do */
 324   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
 325     (*info->fprintf_func) (info->stream, "%ld", value);
 326   else
 327     (*info->fprintf_func) (info->stream, "0x%lx", value);
 328 }
 329
 330 /* Default address handler.  */
 331
 332 static void
 333 print_address (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 334                void *dis_info,
 335                bfd_vma value,
 336                unsigned int attrs,
 337                bfd_vma pc ATTRIBUTE_UNUSED,
 338                int length ATTRIBUTE_UNUSED)
 339 {
 340   disassemble_info *info = (disassemble_info *) dis_info;
 341
 342   /* Print the operand as directed by the attributes.  */
 343   if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
 344     ; /* Nothing to do.  */
 345   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_PCREL_ADDR))
 346     (*info->print_address_func) (value, info);
 347   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_ABS_ADDR))
 348     (*info->print_address_func) (value, info);
 349   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
 350     (*info->fprintf_func) (info->stream, "%ld", (long) value);
 351   else
 352     (*info->fprintf_func) (info->stream, "0x%lx", (long) value);
 353 }
 354
 355 /* Keyword print handler.  */
 356
 357 static void
 358 print_keyword (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 359                void *dis_info,
 360                CGEN_KEYWORD *keyword_table,
 361                long value,
 362                unsigned int attrs ATTRIBUTE_UNUSED)
 363 {
 364   disassemble_info *info = (disassemble_info *) dis_info;
 365   const CGEN_KEYWORD_ENTRY *ke;
 366
 367   ke = cgen_keyword_lookup_value (keyword_table, value);
 368   if (ke != NULL)
 369     (*info->fprintf_func) (info->stream, "%s", ke->name);
 370   else
 371     (*info->fprintf_func) (info->stream, "???");
 372 }
 373 \f
 374 /* Default insn printer.
 375
 376    DIS_INFO is defined as `void *' so the disassembler needn't know anything
 377    about disassemble_info.  */
 378
 379 static void
 380 print_insn_normal (CGEN_CPU_DESC cd,
 381                    void *dis_info,
 382                    const CGEN_INSN *insn,
 383                    CGEN_FIELDS *fields,
 384                    bfd_vma pc,
 385                    int length)
 386 {
 387   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 388   disassemble_info *info = (disassemble_info *) dis_info;
 389   const CGEN_SYNTAX_CHAR_TYPE *syn;
 390
 391   CGEN_INIT_PRINT (cd);
 392
 393   for (syn = CGEN_SYNTAX_STRING (syntax); *syn; ++syn)
 394     {
 395       if (CGEN_SYNTAX_MNEMONIC_P (*syn))
 396         {
 397           (*info->fprintf_func) (info->stream, "%s", CGEN_INSN_MNEMONIC (insn));
 398           continue;
 399         }
 400       if (CGEN_SYNTAX_CHAR_P (*syn))
 401         {
 402           (*info->fprintf_func) (info->stream, "%c", CGEN_SYNTAX_CHAR (*syn));
 403           continue;
 404         }
 405
 406       /* We have an operand.  */
 407       ip2k_cgen_print_operand (cd, CGEN_SYNTAX_FIELD (*syn), info,
 408                                  fields, CGEN_INSN_ATTRS (insn), pc, length);
 409     }
 410 }
 411 \f
 412 /* Subroutine of print_insn. Reads an insn into the given buffers and updates
 413    the extract info.
 414    Returns 0 if all is well, non-zero otherwise.  */
 415
 416 static int
 417 read_insn (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 418            bfd_vma pc,
 419            disassemble_info *info,
 420            bfd_byte *buf,
 421            int buflen,
 422            CGEN_EXTRACT_INFO *ex_info,
 423            unsigned long *insn_value)
 424 {
 425   int status = (*info->read_memory_func) (pc, buf, buflen, info);
 426
 427   if (status != 0)
 428     {
 429       (*info->memory_error_func) (status, pc, info);
 430       return -1;
 431     }
 432
 433   ex_info->dis_info = info;
 434   ex_info->valid = (1 << buflen) - 1;
 435   ex_info->insn_bytes = buf;
 436
 437   *insn_value = bfd_get_bits (buf, buflen * 8, info->endian == BFD_ENDIAN_BIG);
 438   return 0;
 439 }
 440
 441 /* Utility to print an insn.
 442    BUF is the base part of the insn, target byte order, BUFLEN bytes long.
 443    The result is the size of the insn in bytes or zero for an unknown insn
 444    or -1 if an error occurs fetching data (memory_error_func will have
 445    been called).  */
 446
 447 static int
 448 print_insn (CGEN_CPU_DESC cd,
 449             bfd_vma pc,
 450             disassemble_info *info,
 451             bfd_byte *buf,
 452             unsigned int buflen)
 453 {
 454   CGEN_INSN_INT insn_value;
 455   const CGEN_INSN_LIST *insn_list;
 456   CGEN_EXTRACT_INFO ex_info;
 457   int basesize;
 458
 459   /* Extract base part of instruction, just in case CGEN_DIS_* uses it. */
 460   basesize = cd->base_insn_bitsize < buflen * 8 ?
 461                                      cd->base_insn_bitsize : buflen * 8;
 462   insn_value = cgen_get_insn_value (cd, buf, basesize);
 463
 464
 465   /* Fill in ex_info fields like read_insn would.  Don't actually call
 466      read_insn, since the incoming buffer is already read (and possibly
 467      modified a la m32r).  */
 468   ex_info.valid = (1 << buflen) - 1;
 469   ex_info.dis_info = info;
 470   ex_info.insn_bytes = buf;
 471
 472   /* The instructions are stored in hash lists.
 473      Pick the first one and keep trying until we find the right one.  */
 474
 475   insn_list = CGEN_DIS_LOOKUP_INSN (cd, (char *) buf, insn_value);
 476   while (insn_list != NULL)
 477     {
 478       const CGEN_INSN *insn = insn_list->insn;
 479       CGEN_FIELDS fields;
 480       int length;
 481       unsigned long insn_value_cropped;
 482
 483 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 484       /* Not needed as insn shouldn't be in hash lists if not supported.  */
 485       /* Supported by this cpu?  */
 486       if (! ip2k_cgen_insn_supported (cd, insn))
 487         {
 488           insn_list = CGEN_DIS_NEXT_INSN (insn_list);
 489           continue;
 490         }
 491 #endif
 492
 493       /* Basic bit mask must be correct.  */
 494       /* ??? May wish to allow target to defer this check until the extract
 495          handler.  */
 496
 497       /* Base size may exceed this instruction's size.  Extract the
 498          relevant part from the buffer. */
 499       if ((unsigned) (CGEN_INSN_BITSIZE (insn) / 8) < buflen &&
 500           (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
 501         insn_value_cropped = bfd_get_bits (buf, CGEN_INSN_BITSIZE (insn),
 502                                            info->endian == BFD_ENDIAN_BIG);
 503       else
 504         insn_value_cropped = insn_value;
 505
 506       if ((insn_value_cropped & CGEN_INSN_BASE_MASK (insn))
 507           == CGEN_INSN_BASE_VALUE (insn))
 508         {
 509           /* Printing is handled in two passes.  The first pass parses the
 510              machine insn and extracts the fields.  The second pass prints
 511              them.  */
 512
 513           /* Make sure the entire insn is loaded into insn_value, if it
 514              can fit.  */
 515           if (((unsigned) CGEN_INSN_BITSIZE (insn) > cd->base_insn_bitsize) &&
 516               (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
 517             {
 518               unsigned long full_insn_value;
 519               int rc = read_insn (cd, pc, info, buf,
 520                                   CGEN_INSN_BITSIZE (insn) / 8,
 521                                   & ex_info, & full_insn_value);
 522               if (rc != 0)
 523                 return rc;
 524               length = CGEN_EXTRACT_FN (cd, insn)
 525                 (cd, insn, &ex_info, full_insn_value, &fields, pc);
 526             }
 527           else
 528             length = CGEN_EXTRACT_FN (cd, insn)
 529               (cd, insn, &ex_info, insn_value_cropped, &fields, pc);
 530
 531           /* Length < 0 -> error.  */
 532           if (length < 0)
 533             return length;
 534           if (length > 0)
 535             {
 536               CGEN_PRINT_FN (cd, insn) (cd, info, insn, &fields, pc, length);
 537               /* Length is in bits, result is in bytes.  */
 538               return length / 8;
 539             }
 540         }
 541
 542       insn_list = CGEN_DIS_NEXT_INSN (insn_list);
 543     }
 544
 545   return 0;
 546 }
 547
 548 /* Default value for CGEN_PRINT_INSN.
 549    The result is the size of the insn in bytes or zero for an unknown insn
 550    or -1 if an error occured fetching bytes.  */
 551
 552 #ifndef CGEN_PRINT_INSN
 553 #define CGEN_PRINT_INSN default_print_insn
 554 #endif
 555
 556 static int
 557 default_print_insn (CGEN_CPU_DESC cd, bfd_vma pc, disassemble_info *info)
 558 {
 559   bfd_byte buf[CGEN_MAX_INSN_SIZE];
 560   int buflen;
 561   int status;
 562
 563   /* Attempt to read the base part of the insn.  */
 564   buflen = cd->base_insn_bitsize / 8;
 565   status = (*info->read_memory_func) (pc, buf, buflen, info);
 566
 567   /* Try again with the minimum part, if min < base.  */
 568   if (status != 0 && (cd->min_insn_bitsize < cd->base_insn_bitsize))
 569     {
 570       buflen = cd->min_insn_bitsize / 8;
 571       status = (*info->read_memory_func) (pc, buf, buflen, info);
 572     }
 573
 574   if (status != 0)
 575     {
 576       (*info->memory_error_func) (status, pc, info);
 577       return -1;
 578     }
 579
 580   return print_insn (cd, pc, info, buf, buflen);
 581 }
 582
 583 /* Main entry point.
 584    Print one instruction from PC on INFO->STREAM.
 585    Return the size of the instruction (in bytes).  */
 586
 587 typedef struct cpu_desc_list
 588 {
 589   struct cpu_desc_list *next;
 590   CGEN_BITSET *isa;
 591   int mach;
 592   int endian;
 593   CGEN_CPU_DESC cd;
 594 } cpu_desc_list;
 595
 596 int
 597 print_insn_ip2k (bfd_vma pc, disassemble_info *info)
 598 {
 599   static cpu_desc_list *cd_list = 0;
 600   cpu_desc_list *cl = 0;
 601   static CGEN_CPU_DESC cd = 0;
 602   static CGEN_BITSET *prev_isa;
 603   static int prev_mach;
 604   static int prev_endian;
 605   int length;
 606   CGEN_BITSET *isa;
 607   int mach;
 608   int endian = (info->endian == BFD_ENDIAN_BIG
 609                 ? CGEN_ENDIAN_BIG
 610                 : CGEN_ENDIAN_LITTLE);
 611   enum bfd_architecture arch;
 612
 613   /* ??? gdb will set mach but leave the architecture as "unknown" */
 614 #ifndef CGEN_BFD_ARCH
 615 #define CGEN_BFD_ARCH bfd_arch_ip2k
 616 #endif
 617   arch = info->arch;
 618   if (arch == bfd_arch_unknown)
 619     arch = CGEN_BFD_ARCH;
 620
 621   /* There's no standard way to compute the machine or isa number
 622      so we leave it to the target.  */
 623 #ifdef CGEN_COMPUTE_MACH
 624   mach = CGEN_COMPUTE_MACH (info);
 625 #else
 626   mach = info->mach;
 627 #endif
 628
 629 #ifdef CGEN_COMPUTE_ISA
 630   {
 631     static CGEN_BITSET *permanent_isa;
 632
 633     if (!permanent_isa)
 634       permanent_isa = cgen_bitset_create (MAX_ISAS);
 635     isa = permanent_isa;
 636     cgen_bitset_clear (isa);
 637     cgen_bitset_add (isa, CGEN_COMPUTE_ISA (info));
 638   }
 639 #else
 640   isa = info->insn_sets;
 641 #endif
 642
 643   /* If we've switched cpu's, try to find a handle we've used before */
 644   if (cd
 645       && (cgen_bitset_compare (isa, prev_isa) != 0
 646           || mach != prev_mach
 647           || endian != prev_endian))
 648     {
 649       cd = 0;
 650       for (cl = cd_list; cl; cl = cl->next)
 651         {
 652           if (cgen_bitset_compare (cl->isa, isa) == 0 &&
 653               cl->mach == mach &&
 654               cl->endian == endian)
 655             {
 656               cd = cl->cd;
 657               prev_isa = cd->isas;
 658               break;
 659             }
 660         }
 661     }
 662
 663   /* If we haven't initialized yet, initialize the opcode table.  */
 664   if (! cd)
 665     {
 666       const bfd_arch_info_type *arch_type = bfd_lookup_arch (arch, mach);
 667       const char *mach_name;
 668
 669       if (!arch_type)
 670         abort ();
 671       mach_name = arch_type->printable_name;
 672
 673       prev_isa = cgen_bitset_copy (isa);
 674       prev_mach = mach;
 675       prev_endian = endian;
 676       cd = ip2k_cgen_cpu_open (CGEN_CPU_OPEN_ISAS, prev_isa,
 677                                  CGEN_CPU_OPEN_BFDMACH, mach_name,
 678                                  CGEN_CPU_OPEN_ENDIAN, prev_endian,
 679                                  CGEN_CPU_OPEN_END);
 680       if (!cd)
 681         abort ();
 682
 683       /* Save this away for future reference.  */
 684       cl = xmalloc (sizeof (struct cpu_desc_list));
 685       cl->cd = cd;
 686       cl->isa = prev_isa;
 687       cl->mach = mach;
 688       cl->endian = endian;
 689       cl->next = cd_list;
 690       cd_list = cl;
 691
 692       ip2k_cgen_init_dis (cd);
 693     }
 694
 695   /* We try to have as much common code as possible.
 696      But at this point some targets need to take over.  */
 697   /* ??? Some targets may need a hook elsewhere.  Try to avoid this,
 698      but if not possible try to move this hook elsewhere rather than
 699      have two hooks.  */
 700   length = CGEN_PRINT_INSN (cd, pc, info);
 701   if (length > 0)
 702     return length;
 703   if (length < 0)
 704     return -1;
 705
 706   (*info->fprintf_func) (info->stream, UNKNOWN_INSN_MSG);
 707   return cd->default_insn_bitsize / 8;
 708 }