opcodes/iq2000-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 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2005, 2007
   8    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 "dis-asm.h"
  33 #include "bfd.h"
  34 #include "symcat.h"
  35 #include "libiberty.h"
  36 #include "iq2000-desc.h"
  37 #include "iq2000-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
  62 void iq2000_cgen_print_operand
  63   (CGEN_CPU_DESC, int, PTR, CGEN_FIELDS *, void const *, bfd_vma, int);
  64
  65 /* Main entry point for printing operands.
  66    XINFO is a `void *' and not a `disassemble_info *' to not put a requirement
  67    of dis-asm.h on cgen.h.
  68
  69    This function is basically just a big switch statement.  Earlier versions
  70    used tables to look up the function to use, but
  71    - if the table contains both assembler and disassembler functions then
  72      the disassembler contains much of the assembler and vice-versa,
  73    - there's a lot of inlining possibilities as things grow,
  74    - using a switch statement avoids the function call overhead.
  75
  76    This function could be moved into `print_insn_normal', but keeping it
  77    separate makes clear the interface between `print_insn_normal' and each of
  78    the handlers.  */
  79
  80 void
  81 iq2000_cgen_print_operand (CGEN_CPU_DESC cd,
  82                            int opindex,
  83                            void * xinfo,
  84                            CGEN_FIELDS *fields,
  85                            void const *attrs ATTRIBUTE_UNUSED,
  86                            bfd_vma pc,
  87                            int length)
  88 {
  89   disassemble_info *info = (disassemble_info *) xinfo;
  90
  91   switch (opindex)
  92     {
  93     case IQ2000_OPERAND__INDEX :
  94       print_normal (cd, info, fields->f_index, 0, pc, length);
  95       break;
  96     case IQ2000_OPERAND_BASE :
  97       print_keyword (cd, info, & iq2000_cgen_opval_gr_names, fields->f_rs, 0);
  98       break;
  99     case IQ2000_OPERAND_BASEOFF :
 100       print_address (cd, info, fields->f_imm, 0, pc, length);
 101       break;
 102     case IQ2000_OPERAND_BITNUM :
 103       print_normal (cd, info, fields->f_rt, 0, pc, length);
 104       break;
 105     case IQ2000_OPERAND_BYTECOUNT :
 106       print_normal (cd, info, fields->f_bytecount, 0, pc, length);
 107       break;
 108     case IQ2000_OPERAND_CAM_Y :
 109       print_normal (cd, info, fields->f_cam_y, 0, pc, length);
 110       break;
 111     case IQ2000_OPERAND_CAM_Z :
 112       print_normal (cd, info, fields->f_cam_z, 0, pc, length);
 113       break;
 114     case IQ2000_OPERAND_CM_3FUNC :
 115       print_normal (cd, info, fields->f_cm_3func, 0, pc, length);
 116       break;
 117     case IQ2000_OPERAND_CM_3Z :
 118       print_normal (cd, info, fields->f_cm_3z, 0, pc, length);
 119       break;
 120     case IQ2000_OPERAND_CM_4FUNC :
 121       print_normal (cd, info, fields->f_cm_4func, 0, pc, length);
 122       break;
 123     case IQ2000_OPERAND_CM_4Z :
 124       print_normal (cd, info, fields->f_cm_4z, 0, pc, length);
 125       break;
 126     case IQ2000_OPERAND_COUNT :
 127       print_normal (cd, info, fields->f_count, 0, pc, length);
 128       break;
 129     case IQ2000_OPERAND_EXECODE :
 130       print_normal (cd, info, fields->f_excode, 0, pc, length);
 131       break;
 132     case IQ2000_OPERAND_HI16 :
 133       print_normal (cd, info, fields->f_imm, 0, pc, length);
 134       break;
 135     case IQ2000_OPERAND_IMM :
 136       print_normal (cd, info, fields->f_imm, 0, pc, length);
 137       break;
 138     case IQ2000_OPERAND_JMPTARG :
 139       print_address (cd, info, fields->f_jtarg, 0|(1<<CGEN_OPERAND_ABS_ADDR), pc, length);
 140       break;
 141     case IQ2000_OPERAND_JMPTARGQ10 :
 142       print_address (cd, info, fields->f_jtargq10, 0|(1<<CGEN_OPERAND_ABS_ADDR), pc, length);
 143       break;
 144     case IQ2000_OPERAND_LO16 :
 145       print_normal (cd, info, fields->f_imm, 0, pc, length);
 146       break;
 147     case IQ2000_OPERAND_MASK :
 148       print_normal (cd, info, fields->f_mask, 0, pc, length);
 149       break;
 150     case IQ2000_OPERAND_MASKL :
 151       print_normal (cd, info, fields->f_maskl, 0, pc, length);
 152       break;
 153     case IQ2000_OPERAND_MASKQ10 :
 154       print_normal (cd, info, fields->f_maskq10, 0, pc, length);
 155       break;
 156     case IQ2000_OPERAND_MASKR :
 157       print_normal (cd, info, fields->f_rs, 0, pc, length);
 158       break;
 159     case IQ2000_OPERAND_MLO16 :
 160       print_normal (cd, info, fields->f_imm, 0, pc, length);
 161       break;
 162     case IQ2000_OPERAND_OFFSET :
 163       print_address (cd, info, fields->f_offset, 0|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
 164       break;
 165     case IQ2000_OPERAND_RD :
 166       print_keyword (cd, info, & iq2000_cgen_opval_gr_names, fields->f_rd, 0);
 167       break;
 168     case IQ2000_OPERAND_RD_RS :
 169       print_keyword (cd, info, & iq2000_cgen_opval_gr_names, fields->f_rd_rs, 0|(1<<CGEN_OPERAND_VIRTUAL));
 170       break;
 171     case IQ2000_OPERAND_RD_RT :
 172       print_keyword (cd, info, & iq2000_cgen_opval_gr_names, fields->f_rd_rt, 0|(1<<CGEN_OPERAND_VIRTUAL));
 173       break;
 174     case IQ2000_OPERAND_RS :
 175       print_keyword (cd, info, & iq2000_cgen_opval_gr_names, fields->f_rs, 0);
 176       break;
 177     case IQ2000_OPERAND_RT :
 178       print_keyword (cd, info, & iq2000_cgen_opval_gr_names, fields->f_rt, 0);
 179       break;
 180     case IQ2000_OPERAND_RT_RS :
 181       print_keyword (cd, info, & iq2000_cgen_opval_gr_names, fields->f_rt_rs, 0|(1<<CGEN_OPERAND_VIRTUAL));
 182       break;
 183     case IQ2000_OPERAND_SHAMT :
 184       print_normal (cd, info, fields->f_shamt, 0, pc, length);
 185       break;
 186
 187     default :
 188       /* xgettext:c-format */
 189       fprintf (stderr, _("Unrecognized field %d while printing insn.\n"),
 190                opindex);
 191     abort ();
 192   }
 193 }
 194
 195 cgen_print_fn * const iq2000_cgen_print_handlers[] =
 196 {
 197   print_insn_normal,
 198 };
 199
 200
 201 void
 202 iq2000_cgen_init_dis (CGEN_CPU_DESC cd)
 203 {
 204   iq2000_cgen_init_opcode_table (cd);
 205   iq2000_cgen_init_ibld_table (cd);
 206   cd->print_handlers = & iq2000_cgen_print_handlers[0];
 207   cd->print_operand = iq2000_cgen_print_operand;
 208 }
 209
 210 \f
 211 /* Default print handler.  */
 212
 213 static void
 214 print_normal (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 215               void *dis_info,
 216               long value,
 217               unsigned int attrs,
 218               bfd_vma pc ATTRIBUTE_UNUSED,
 219               int length ATTRIBUTE_UNUSED)
 220 {
 221   disassemble_info *info = (disassemble_info *) dis_info;
 222
 223 #ifdef CGEN_PRINT_NORMAL
 224   CGEN_PRINT_NORMAL (cd, info, value, attrs, pc, length);
 225 #endif
 226
 227   /* Print the operand as directed by the attributes.  */
 228   if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
 229     ; /* nothing to do */
 230   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
 231     (*info->fprintf_func) (info->stream, "%ld", value);
 232   else
 233     (*info->fprintf_func) (info->stream, "0x%lx", value);
 234 }
 235
 236 /* Default address handler.  */
 237
 238 static void
 239 print_address (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 240                void *dis_info,
 241                bfd_vma value,
 242                unsigned int attrs,
 243                bfd_vma pc ATTRIBUTE_UNUSED,
 244                int length ATTRIBUTE_UNUSED)
 245 {
 246   disassemble_info *info = (disassemble_info *) dis_info;
 247
 248 #ifdef CGEN_PRINT_ADDRESS
 249   CGEN_PRINT_ADDRESS (cd, info, value, attrs, pc, length);
 250 #endif
 251
 252   /* Print the operand as directed by the attributes.  */
 253   if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
 254     ; /* Nothing to do.  */
 255   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_PCREL_ADDR))
 256     (*info->print_address_func) (value, info);
 257   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_ABS_ADDR))
 258     (*info->print_address_func) (value, info);
 259   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
 260     (*info->fprintf_func) (info->stream, "%ld", (long) value);
 261   else
 262     (*info->fprintf_func) (info->stream, "0x%lx", (long) value);
 263 }
 264
 265 /* Keyword print handler.  */
 266
 267 static void
 268 print_keyword (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 269                void *dis_info,
 270                CGEN_KEYWORD *keyword_table,
 271                long value,
 272                unsigned int attrs ATTRIBUTE_UNUSED)
 273 {
 274   disassemble_info *info = (disassemble_info *) dis_info;
 275   const CGEN_KEYWORD_ENTRY *ke;
 276
 277   ke = cgen_keyword_lookup_value (keyword_table, value);
 278   if (ke != NULL)
 279     (*info->fprintf_func) (info->stream, "%s", ke->name);
 280   else
 281     (*info->fprintf_func) (info->stream, "???");
 282 }
 283 \f
 284 /* Default insn printer.
 285
 286    DIS_INFO is defined as `void *' so the disassembler needn't know anything
 287    about disassemble_info.  */
 288
 289 static void
 290 print_insn_normal (CGEN_CPU_DESC cd,
 291                    void *dis_info,
 292                    const CGEN_INSN *insn,
 293                    CGEN_FIELDS *fields,
 294                    bfd_vma pc,
 295                    int length)
 296 {
 297   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 298   disassemble_info *info = (disassemble_info *) dis_info;
 299   const CGEN_SYNTAX_CHAR_TYPE *syn;
 300
 301   CGEN_INIT_PRINT (cd);
 302
 303   for (syn = CGEN_SYNTAX_STRING (syntax); *syn; ++syn)
 304     {
 305       if (CGEN_SYNTAX_MNEMONIC_P (*syn))
 306         {
 307           (*info->fprintf_func) (info->stream, "%s", CGEN_INSN_MNEMONIC (insn));
 308           continue;
 309         }
 310       if (CGEN_SYNTAX_CHAR_P (*syn))
 311         {
 312           (*info->fprintf_func) (info->stream, "%c", CGEN_SYNTAX_CHAR (*syn));
 313           continue;
 314         }
 315
 316       /* We have an operand.  */
 317       iq2000_cgen_print_operand (cd, CGEN_SYNTAX_FIELD (*syn), info,
 318                                  fields, CGEN_INSN_ATTRS (insn), pc, length);
 319     }
 320 }
 321 \f
 322 /* Subroutine of print_insn. Reads an insn into the given buffers and updates
 323    the extract info.
 324    Returns 0 if all is well, non-zero otherwise.  */
 325
 326 static int
 327 read_insn (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 328            bfd_vma pc,
 329            disassemble_info *info,
 330            bfd_byte *buf,
 331            int buflen,
 332            CGEN_EXTRACT_INFO *ex_info,
 333            unsigned long *insn_value)
 334 {
 335   int status = (*info->read_memory_func) (pc, buf, buflen, info);
 336
 337   if (status != 0)
 338     {
 339       (*info->memory_error_func) (status, pc, info);
 340       return -1;
 341     }
 342
 343   ex_info->dis_info = info;
 344   ex_info->valid = (1 << buflen) - 1;
 345   ex_info->insn_bytes = buf;
 346
 347   *insn_value = bfd_get_bits (buf, buflen * 8, info->endian == BFD_ENDIAN_BIG);
 348   return 0;
 349 }
 350
 351 /* Utility to print an insn.
 352    BUF is the base part of the insn, target byte order, BUFLEN bytes long.
 353    The result is the size of the insn in bytes or zero for an unknown insn
 354    or -1 if an error occurs fetching data (memory_error_func will have
 355    been called).  */
 356
 357 static int
 358 print_insn (CGEN_CPU_DESC cd,
 359             bfd_vma pc,
 360             disassemble_info *info,
 361             bfd_byte *buf,
 362             unsigned int buflen)
 363 {
 364   CGEN_INSN_INT insn_value;
 365   const CGEN_INSN_LIST *insn_list;
 366   CGEN_EXTRACT_INFO ex_info;
 367   int basesize;
 368
 369   /* Extract base part of instruction, just in case CGEN_DIS_* uses it. */
 370   basesize = cd->base_insn_bitsize < buflen * 8 ?
 371                                      cd->base_insn_bitsize : buflen * 8;
 372   insn_value = cgen_get_insn_value (cd, buf, basesize);
 373
 374
 375   /* Fill in ex_info fields like read_insn would.  Don't actually call
 376      read_insn, since the incoming buffer is already read (and possibly
 377      modified a la m32r).  */
 378   ex_info.valid = (1 << buflen) - 1;
 379   ex_info.dis_info = info;
 380   ex_info.insn_bytes = buf;
 381
 382   /* The instructions are stored in hash lists.
 383      Pick the first one and keep trying until we find the right one.  */
 384
 385   insn_list = CGEN_DIS_LOOKUP_INSN (cd, (char *) buf, insn_value);
 386   while (insn_list != NULL)
 387     {
 388       const CGEN_INSN *insn = insn_list->insn;
 389       CGEN_FIELDS fields;
 390       int length;
 391       unsigned long insn_value_cropped;
 392
 393 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 394       /* Not needed as insn shouldn't be in hash lists if not supported.  */
 395       /* Supported by this cpu?  */
 396       if (! iq2000_cgen_insn_supported (cd, insn))
 397         {
 398           insn_list = CGEN_DIS_NEXT_INSN (insn_list);
 399           continue;
 400         }
 401 #endif
 402
 403       /* Basic bit mask must be correct.  */
 404       /* ??? May wish to allow target to defer this check until the extract
 405          handler.  */
 406
 407       /* Base size may exceed this instruction's size.  Extract the
 408          relevant part from the buffer. */
 409       if ((unsigned) (CGEN_INSN_BITSIZE (insn) / 8) < buflen &&
 410           (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
 411         insn_value_cropped = bfd_get_bits (buf, CGEN_INSN_BITSIZE (insn),
 412                                            info->endian == BFD_ENDIAN_BIG);
 413       else
 414         insn_value_cropped = insn_value;
 415
 416       if ((insn_value_cropped & CGEN_INSN_BASE_MASK (insn))
 417           == CGEN_INSN_BASE_VALUE (insn))
 418         {
 419           /* Printing is handled in two passes.  The first pass parses the
 420              machine insn and extracts the fields.  The second pass prints
 421              them.  */
 422
 423           /* Make sure the entire insn is loaded into insn_value, if it
 424              can fit.  */
 425           if (((unsigned) CGEN_INSN_BITSIZE (insn) > cd->base_insn_bitsize) &&
 426               (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
 427             {
 428               unsigned long full_insn_value;
 429               int rc = read_insn (cd, pc, info, buf,
 430                                   CGEN_INSN_BITSIZE (insn) / 8,
 431                                   & ex_info, & full_insn_value);
 432               if (rc != 0)
 433                 return rc;
 434               length = CGEN_EXTRACT_FN (cd, insn)
 435                 (cd, insn, &ex_info, full_insn_value, &fields, pc);
 436             }
 437           else
 438             length = CGEN_EXTRACT_FN (cd, insn)
 439               (cd, insn, &ex_info, insn_value_cropped, &fields, pc);
 440
 441           /* Length < 0 -> error.  */
 442           if (length < 0)
 443             return length;
 444           if (length > 0)
 445             {
 446               CGEN_PRINT_FN (cd, insn) (cd, info, insn, &fields, pc, length);
 447               /* Length is in bits, result is in bytes.  */
 448               return length / 8;
 449             }
 450         }
 451
 452       insn_list = CGEN_DIS_NEXT_INSN (insn_list);
 453     }
 454
 455   return 0;
 456 }
 457
 458 /* Default value for CGEN_PRINT_INSN.
 459    The result is the size of the insn in bytes or zero for an unknown insn
 460    or -1 if an error occured fetching bytes.  */
 461
 462 #ifndef CGEN_PRINT_INSN
 463 #define CGEN_PRINT_INSN default_print_insn
 464 #endif
 465
 466 static int
 467 default_print_insn (CGEN_CPU_DESC cd, bfd_vma pc, disassemble_info *info)
 468 {
 469   bfd_byte buf[CGEN_MAX_INSN_SIZE];
 470   int buflen;
 471   int status;
 472
 473   /* Attempt to read the base part of the insn.  */
 474   buflen = cd->base_insn_bitsize / 8;
 475   status = (*info->read_memory_func) (pc, buf, buflen, info);
 476
 477   /* Try again with the minimum part, if min < base.  */
 478   if (status != 0 && (cd->min_insn_bitsize < cd->base_insn_bitsize))
 479     {
 480       buflen = cd->min_insn_bitsize / 8;
 481       status = (*info->read_memory_func) (pc, buf, buflen, info);
 482     }
 483
 484   if (status != 0)
 485     {
 486       (*info->memory_error_func) (status, pc, info);
 487       return -1;
 488     }
 489
 490   return print_insn (cd, pc, info, buf, buflen);
 491 }
 492
 493 /* Main entry point.
 494    Print one instruction from PC on INFO->STREAM.
 495    Return the size of the instruction (in bytes).  */
 496
 497 typedef struct cpu_desc_list
 498 {
 499   struct cpu_desc_list *next;
 500   CGEN_BITSET *isa;
 501   int mach;
 502   int endian;
 503   CGEN_CPU_DESC cd;
 504 } cpu_desc_list;
 505
 506 int
 507 print_insn_iq2000 (bfd_vma pc, disassemble_info *info)
 508 {
 509   static cpu_desc_list *cd_list = 0;
 510   cpu_desc_list *cl = 0;
 511   static CGEN_CPU_DESC cd = 0;
 512   static CGEN_BITSET *prev_isa;
 513   static int prev_mach;
 514   static int prev_endian;
 515   int length;
 516   CGEN_BITSET *isa;
 517   int mach;
 518   int endian = (info->endian == BFD_ENDIAN_BIG
 519                 ? CGEN_ENDIAN_BIG
 520                 : CGEN_ENDIAN_LITTLE);
 521   enum bfd_architecture arch;
 522
 523   /* ??? gdb will set mach but leave the architecture as "unknown" */
 524 #ifndef CGEN_BFD_ARCH
 525 #define CGEN_BFD_ARCH bfd_arch_iq2000
 526 #endif
 527   arch = info->arch;
 528   if (arch == bfd_arch_unknown)
 529     arch = CGEN_BFD_ARCH;
 530
 531   /* There's no standard way to compute the machine or isa number
 532      so we leave it to the target.  */
 533 #ifdef CGEN_COMPUTE_MACH
 534   mach = CGEN_COMPUTE_MACH (info);
 535 #else
 536   mach = info->mach;
 537 #endif
 538
 539 #ifdef CGEN_COMPUTE_ISA
 540   {
 541     static CGEN_BITSET *permanent_isa;
 542
 543     if (!permanent_isa)
 544       permanent_isa = cgen_bitset_create (MAX_ISAS);
 545     isa = permanent_isa;
 546     cgen_bitset_clear (isa);
 547     cgen_bitset_add (isa, CGEN_COMPUTE_ISA (info));
 548   }
 549 #else
 550   isa = info->insn_sets;
 551 #endif
 552
 553   /* If we've switched cpu's, try to find a handle we've used before */
 554   if (cd
 555       && (cgen_bitset_compare (isa, prev_isa) != 0
 556           || mach != prev_mach
 557           || endian != prev_endian))
 558     {
 559       cd = 0;
 560       for (cl = cd_list; cl; cl = cl->next)
 561         {
 562           if (cgen_bitset_compare (cl->isa, isa) == 0 &&
 563               cl->mach == mach &&
 564               cl->endian == endian)
 565             {
 566               cd = cl->cd;
 567               prev_isa = cd->isas;
 568               break;
 569             }
 570         }
 571     }
 572
 573   /* If we haven't initialized yet, initialize the opcode table.  */
 574   if (! cd)
 575     {
 576       const bfd_arch_info_type *arch_type = bfd_lookup_arch (arch, mach);
 577       const char *mach_name;
 578
 579       if (!arch_type)
 580         abort ();
 581       mach_name = arch_type->printable_name;
 582
 583       prev_isa = cgen_bitset_copy (isa);
 584       prev_mach = mach;
 585       prev_endian = endian;
 586       cd = iq2000_cgen_cpu_open (CGEN_CPU_OPEN_ISAS, prev_isa,
 587                                  CGEN_CPU_OPEN_BFDMACH, mach_name,
 588                                  CGEN_CPU_OPEN_ENDIAN, prev_endian,
 589                                  CGEN_CPU_OPEN_END);
 590       if (!cd)
 591         abort ();
 592
 593       /* Save this away for future reference.  */
 594       cl = xmalloc (sizeof (struct cpu_desc_list));
 595       cl->cd = cd;
 596       cl->isa = prev_isa;
 597       cl->mach = mach;
 598       cl->endian = endian;
 599       cl->next = cd_list;
 600       cd_list = cl;
 601
 602       iq2000_cgen_init_dis (cd);
 603     }
 604
 605   /* We try to have as much common code as possible.
 606      But at this point some targets need to take over.  */
 607   /* ??? Some targets may need a hook elsewhere.  Try to avoid this,
 608      but if not possible try to move this hook elsewhere rather than
 609      have two hooks.  */
 610   length = CGEN_PRINT_INSN (cd, pc, info);
 611   if (length > 0)
 612     return length;
 613   if (length < 0)
 614     return -1;
 615
 616   (*info->fprintf_func) (info->stream, UNKNOWN_INSN_MSG);
 617   return cd->default_insn_bitsize / 8;
 618 }