opcodes/mt-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    2008, 2010  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 "mt-desc.h"
  37 #include "mt-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 print_dollarhex (CGEN_CPU_DESC, PTR, long, unsigned, bfd_vma, int);
  63 static void print_pcrel (CGEN_CPU_DESC, PTR, long, unsigned, bfd_vma, int);
  64
  65 static void
  66 print_dollarhex (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
  67                  void * dis_info,
  68                  long value,
  69                  unsigned int attrs ATTRIBUTE_UNUSED,
  70                  bfd_vma pc ATTRIBUTE_UNUSED,
  71                  int length ATTRIBUTE_UNUSED)
  72 {
  73   disassemble_info *info = (disassemble_info *) dis_info;
  74
  75   info->fprintf_func (info->stream, "$%lx", value & 0xffffffff);
  76
  77   if (0)
  78     print_normal (cd, dis_info, value, attrs, pc, length);
  79 }
  80
  81 static void
  82 print_pcrel (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
  83              void * dis_info,
  84              long value,
  85              unsigned int attrs ATTRIBUTE_UNUSED,
  86              bfd_vma pc ATTRIBUTE_UNUSED,
  87              int length ATTRIBUTE_UNUSED)
  88 {
  89   print_address (cd, dis_info, value + pc, attrs, pc, length);
  90 }
  91
  92 /* -- */
  93
  94 void mt_cgen_print_operand
  95   (CGEN_CPU_DESC, int, PTR, CGEN_FIELDS *, void const *, bfd_vma, int);
  96
  97 /* Main entry point for printing operands.
  98    XINFO is a `void *' and not a `disassemble_info *' to not put a requirement
  99    of dis-asm.h on cgen.h.
 100
 101    This function is basically just a big switch statement.  Earlier versions
 102    used tables to look up the function to use, but
 103    - if the table contains both assembler and disassembler functions then
 104      the disassembler contains much of the assembler and vice-versa,
 105    - there's a lot of inlining possibilities as things grow,
 106    - using a switch statement avoids the function call overhead.
 107
 108    This function could be moved into `print_insn_normal', but keeping it
 109    separate makes clear the interface between `print_insn_normal' and each of
 110    the handlers.  */
 111
 112 void
 113 mt_cgen_print_operand (CGEN_CPU_DESC cd,
 114                            int opindex,
 115                            void * xinfo,
 116                            CGEN_FIELDS *fields,
 117                            void const *attrs ATTRIBUTE_UNUSED,
 118                            bfd_vma pc,
 119                            int length)
 120 {
 121   disassemble_info *info = (disassemble_info *) xinfo;
 122
 123   switch (opindex)
 124     {
 125     case MT_OPERAND_A23 :
 126       print_dollarhex (cd, info, fields->f_a23, 0, pc, length);
 127       break;
 128     case MT_OPERAND_BALL :
 129       print_dollarhex (cd, info, fields->f_ball, 0, pc, length);
 130       break;
 131     case MT_OPERAND_BALL2 :
 132       print_dollarhex (cd, info, fields->f_ball2, 0, pc, length);
 133       break;
 134     case MT_OPERAND_BANKADDR :
 135       print_dollarhex (cd, info, fields->f_bankaddr, 0, pc, length);
 136       break;
 137     case MT_OPERAND_BRC :
 138       print_dollarhex (cd, info, fields->f_brc, 0, pc, length);
 139       break;
 140     case MT_OPERAND_BRC2 :
 141       print_dollarhex (cd, info, fields->f_brc2, 0, pc, length);
 142       break;
 143     case MT_OPERAND_CB1INCR :
 144       print_dollarhex (cd, info, fields->f_cb1incr, 0|(1<<CGEN_OPERAND_SIGNED), pc, length);
 145       break;
 146     case MT_OPERAND_CB1SEL :
 147       print_dollarhex (cd, info, fields->f_cb1sel, 0, pc, length);
 148       break;
 149     case MT_OPERAND_CB2INCR :
 150       print_dollarhex (cd, info, fields->f_cb2incr, 0|(1<<CGEN_OPERAND_SIGNED), pc, length);
 151       break;
 152     case MT_OPERAND_CB2SEL :
 153       print_dollarhex (cd, info, fields->f_cb2sel, 0, pc, length);
 154       break;
 155     case MT_OPERAND_CBRB :
 156       print_dollarhex (cd, info, fields->f_cbrb, 0, pc, length);
 157       break;
 158     case MT_OPERAND_CBS :
 159       print_dollarhex (cd, info, fields->f_cbs, 0, pc, length);
 160       break;
 161     case MT_OPERAND_CBX :
 162       print_dollarhex (cd, info, fields->f_cbx, 0, pc, length);
 163       break;
 164     case MT_OPERAND_CCB :
 165       print_dollarhex (cd, info, fields->f_ccb, 0, pc, length);
 166       break;
 167     case MT_OPERAND_CDB :
 168       print_dollarhex (cd, info, fields->f_cdb, 0, pc, length);
 169       break;
 170     case MT_OPERAND_CELL :
 171       print_dollarhex (cd, info, fields->f_cell, 0, pc, length);
 172       break;
 173     case MT_OPERAND_COLNUM :
 174       print_dollarhex (cd, info, fields->f_colnum, 0, pc, length);
 175       break;
 176     case MT_OPERAND_CONTNUM :
 177       print_dollarhex (cd, info, fields->f_contnum, 0, pc, length);
 178       break;
 179     case MT_OPERAND_CR :
 180       print_dollarhex (cd, info, fields->f_cr, 0, pc, length);
 181       break;
 182     case MT_OPERAND_CTXDISP :
 183       print_dollarhex (cd, info, fields->f_ctxdisp, 0, pc, length);
 184       break;
 185     case MT_OPERAND_DUP :
 186       print_dollarhex (cd, info, fields->f_dup, 0, pc, length);
 187       break;
 188     case MT_OPERAND_FBDISP :
 189       print_dollarhex (cd, info, fields->f_fbdisp, 0, pc, length);
 190       break;
 191     case MT_OPERAND_FBINCR :
 192       print_dollarhex (cd, info, fields->f_fbincr, 0, pc, length);
 193       break;
 194     case MT_OPERAND_FRDR :
 195       print_keyword (cd, info, & mt_cgen_opval_h_spr, fields->f_dr, 0|(1<<CGEN_OPERAND_ABS_ADDR));
 196       break;
 197     case MT_OPERAND_FRDRRR :
 198       print_keyword (cd, info, & mt_cgen_opval_h_spr, fields->f_drrr, 0|(1<<CGEN_OPERAND_ABS_ADDR));
 199       break;
 200     case MT_OPERAND_FRSR1 :
 201       print_keyword (cd, info, & mt_cgen_opval_h_spr, fields->f_sr1, 0|(1<<CGEN_OPERAND_ABS_ADDR));
 202       break;
 203     case MT_OPERAND_FRSR2 :
 204       print_keyword (cd, info, & mt_cgen_opval_h_spr, fields->f_sr2, 0|(1<<CGEN_OPERAND_ABS_ADDR));
 205       break;
 206     case MT_OPERAND_ID :
 207       print_dollarhex (cd, info, fields->f_id, 0, pc, length);
 208       break;
 209     case MT_OPERAND_IMM16 :
 210       print_dollarhex (cd, info, fields->f_imm16s, 0|(1<<CGEN_OPERAND_SIGNED), pc, length);
 211       break;
 212     case MT_OPERAND_IMM16L :
 213       print_dollarhex (cd, info, fields->f_imm16l, 0, pc, length);
 214       break;
 215     case MT_OPERAND_IMM16O :
 216       print_pcrel (cd, info, fields->f_imm16s, 0|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
 217       break;
 218     case MT_OPERAND_IMM16Z :
 219       print_dollarhex (cd, info, fields->f_imm16u, 0, pc, length);
 220       break;
 221     case MT_OPERAND_INCAMT :
 222       print_dollarhex (cd, info, fields->f_incamt, 0, pc, length);
 223       break;
 224     case MT_OPERAND_INCR :
 225       print_dollarhex (cd, info, fields->f_incr, 0, pc, length);
 226       break;
 227     case MT_OPERAND_LENGTH :
 228       print_dollarhex (cd, info, fields->f_length, 0, pc, length);
 229       break;
 230     case MT_OPERAND_LOOPSIZE :
 231       print_pcrel (cd, info, fields->f_loopo, 0|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
 232       break;
 233     case MT_OPERAND_MASK :
 234       print_dollarhex (cd, info, fields->f_mask, 0, pc, length);
 235       break;
 236     case MT_OPERAND_MASK1 :
 237       print_dollarhex (cd, info, fields->f_mask1, 0, pc, length);
 238       break;
 239     case MT_OPERAND_MODE :
 240       print_dollarhex (cd, info, fields->f_mode, 0, pc, length);
 241       break;
 242     case MT_OPERAND_PERM :
 243       print_dollarhex (cd, info, fields->f_perm, 0, pc, length);
 244       break;
 245     case MT_OPERAND_RBBC :
 246       print_dollarhex (cd, info, fields->f_rbbc, 0, pc, length);
 247       break;
 248     case MT_OPERAND_RC :
 249       print_dollarhex (cd, info, fields->f_rc, 0, pc, length);
 250       break;
 251     case MT_OPERAND_RC1 :
 252       print_dollarhex (cd, info, fields->f_rc1, 0, pc, length);
 253       break;
 254     case MT_OPERAND_RC2 :
 255       print_dollarhex (cd, info, fields->f_rc2, 0, pc, length);
 256       break;
 257     case MT_OPERAND_RC3 :
 258       print_dollarhex (cd, info, fields->f_rc3, 0, pc, length);
 259       break;
 260     case MT_OPERAND_RCNUM :
 261       print_dollarhex (cd, info, fields->f_rcnum, 0, pc, length);
 262       break;
 263     case MT_OPERAND_RDA :
 264       print_dollarhex (cd, info, fields->f_rda, 0, pc, length);
 265       break;
 266     case MT_OPERAND_ROWNUM :
 267       print_dollarhex (cd, info, fields->f_rownum, 0, pc, length);
 268       break;
 269     case MT_OPERAND_ROWNUM1 :
 270       print_dollarhex (cd, info, fields->f_rownum1, 0, pc, length);
 271       break;
 272     case MT_OPERAND_ROWNUM2 :
 273       print_dollarhex (cd, info, fields->f_rownum2, 0, pc, length);
 274       break;
 275     case MT_OPERAND_SIZE :
 276       print_dollarhex (cd, info, fields->f_size, 0, pc, length);
 277       break;
 278     case MT_OPERAND_TYPE :
 279       print_dollarhex (cd, info, fields->f_type, 0, pc, length);
 280       break;
 281     case MT_OPERAND_WR :
 282       print_dollarhex (cd, info, fields->f_wr, 0, pc, length);
 283       break;
 284     case MT_OPERAND_XMODE :
 285       print_dollarhex (cd, info, fields->f_xmode, 0, pc, length);
 286       break;
 287
 288     default :
 289       /* xgettext:c-format */
 290       fprintf (stderr, _("Unrecognized field %d while printing insn.\n"),
 291                opindex);
 292     abort ();
 293   }
 294 }
 295
 296 cgen_print_fn * const mt_cgen_print_handlers[] =
 297 {
 298   print_insn_normal,
 299 };
 300
 301
 302 void
 303 mt_cgen_init_dis (CGEN_CPU_DESC cd)
 304 {
 305   mt_cgen_init_opcode_table (cd);
 306   mt_cgen_init_ibld_table (cd);
 307   cd->print_handlers = & mt_cgen_print_handlers[0];
 308   cd->print_operand = mt_cgen_print_operand;
 309 }
 310
 311 \f
 312 /* Default print handler.  */
 313
 314 static void
 315 print_normal (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 316               void *dis_info,
 317               long value,
 318               unsigned int attrs,
 319               bfd_vma pc ATTRIBUTE_UNUSED,
 320               int length ATTRIBUTE_UNUSED)
 321 {
 322   disassemble_info *info = (disassemble_info *) dis_info;
 323
 324   /* Print the operand as directed by the attributes.  */
 325   if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
 326     ; /* nothing to do */
 327   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
 328     (*info->fprintf_func) (info->stream, "%ld", value);
 329   else
 330     (*info->fprintf_func) (info->stream, "0x%lx", value);
 331 }
 332
 333 /* Default address handler.  */
 334
 335 static void
 336 print_address (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 337                void *dis_info,
 338                bfd_vma value,
 339                unsigned int attrs,
 340                bfd_vma pc ATTRIBUTE_UNUSED,
 341                int length ATTRIBUTE_UNUSED)
 342 {
 343   disassemble_info *info = (disassemble_info *) dis_info;
 344
 345   /* Print the operand as directed by the attributes.  */
 346   if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
 347     ; /* Nothing to do.  */
 348   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_PCREL_ADDR))
 349     (*info->print_address_func) (value, info);
 350   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_ABS_ADDR))
 351     (*info->print_address_func) (value, info);
 352   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
 353     (*info->fprintf_func) (info->stream, "%ld", (long) value);
 354   else
 355     (*info->fprintf_func) (info->stream, "0x%lx", (long) value);
 356 }
 357
 358 /* Keyword print handler.  */
 359
 360 static void
 361 print_keyword (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 362                void *dis_info,
 363                CGEN_KEYWORD *keyword_table,
 364                long value,
 365                unsigned int attrs ATTRIBUTE_UNUSED)
 366 {
 367   disassemble_info *info = (disassemble_info *) dis_info;
 368   const CGEN_KEYWORD_ENTRY *ke;
 369
 370   ke = cgen_keyword_lookup_value (keyword_table, value);
 371   if (ke != NULL)
 372     (*info->fprintf_func) (info->stream, "%s", ke->name);
 373   else
 374     (*info->fprintf_func) (info->stream, "???");
 375 }
 376 \f
 377 /* Default insn printer.
 378
 379    DIS_INFO is defined as `void *' so the disassembler needn't know anything
 380    about disassemble_info.  */
 381
 382 static void
 383 print_insn_normal (CGEN_CPU_DESC cd,
 384                    void *dis_info,
 385                    const CGEN_INSN *insn,
 386                    CGEN_FIELDS *fields,
 387                    bfd_vma pc,
 388                    int length)
 389 {
 390   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 391   disassemble_info *info = (disassemble_info *) dis_info;
 392   const CGEN_SYNTAX_CHAR_TYPE *syn;
 393
 394   CGEN_INIT_PRINT (cd);
 395
 396   for (syn = CGEN_SYNTAX_STRING (syntax); *syn; ++syn)
 397     {
 398       if (CGEN_SYNTAX_MNEMONIC_P (*syn))
 399         {
 400           (*info->fprintf_func) (info->stream, "%s", CGEN_INSN_MNEMONIC (insn));
 401           continue;
 402         }
 403       if (CGEN_SYNTAX_CHAR_P (*syn))
 404         {
 405           (*info->fprintf_func) (info->stream, "%c", CGEN_SYNTAX_CHAR (*syn));
 406           continue;
 407         }
 408
 409       /* We have an operand.  */
 410       mt_cgen_print_operand (cd, CGEN_SYNTAX_FIELD (*syn), info,
 411                                  fields, CGEN_INSN_ATTRS (insn), pc, length);
 412     }
 413 }
 414 \f
 415 /* Subroutine of print_insn. Reads an insn into the given buffers and updates
 416    the extract info.
 417    Returns 0 if all is well, non-zero otherwise.  */
 418
 419 static int
 420 read_insn (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 421            bfd_vma pc,
 422            disassemble_info *info,
 423            bfd_byte *buf,
 424            int buflen,
 425            CGEN_EXTRACT_INFO *ex_info,
 426            unsigned long *insn_value)
 427 {
 428   int status = (*info->read_memory_func) (pc, buf, buflen, info);
 429
 430   if (status != 0)
 431     {
 432       (*info->memory_error_func) (status, pc, info);
 433       return -1;
 434     }
 435
 436   ex_info->dis_info = info;
 437   ex_info->valid = (1 << buflen) - 1;
 438   ex_info->insn_bytes = buf;
 439
 440   *insn_value = bfd_get_bits (buf, buflen * 8, info->endian == BFD_ENDIAN_BIG);
 441   return 0;
 442 }
 443
 444 /* Utility to print an insn.
 445    BUF is the base part of the insn, target byte order, BUFLEN bytes long.
 446    The result is the size of the insn in bytes or zero for an unknown insn
 447    or -1 if an error occurs fetching data (memory_error_func will have
 448    been called).  */
 449
 450 static int
 451 print_insn (CGEN_CPU_DESC cd,
 452             bfd_vma pc,
 453             disassemble_info *info,
 454             bfd_byte *buf,
 455             unsigned int buflen)
 456 {
 457   CGEN_INSN_INT insn_value;
 458   const CGEN_INSN_LIST *insn_list;
 459   CGEN_EXTRACT_INFO ex_info;
 460   int basesize;
 461
 462   /* Extract base part of instruction, just in case CGEN_DIS_* uses it. */
 463   basesize = cd->base_insn_bitsize < buflen * 8 ?
 464                                      cd->base_insn_bitsize : buflen * 8;
 465   insn_value = cgen_get_insn_value (cd, buf, basesize);
 466
 467
 468   /* Fill in ex_info fields like read_insn would.  Don't actually call
 469      read_insn, since the incoming buffer is already read (and possibly
 470      modified a la m32r).  */
 471   ex_info.valid = (1 << buflen) - 1;
 472   ex_info.dis_info = info;
 473   ex_info.insn_bytes = buf;
 474
 475   /* The instructions are stored in hash lists.
 476      Pick the first one and keep trying until we find the right one.  */
 477
 478   insn_list = CGEN_DIS_LOOKUP_INSN (cd, (char *) buf, insn_value);
 479   while (insn_list != NULL)
 480     {
 481       const CGEN_INSN *insn = insn_list->insn;
 482       CGEN_FIELDS fields;
 483       int length;
 484       unsigned long insn_value_cropped;
 485
 486 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 487       /* Not needed as insn shouldn't be in hash lists if not supported.  */
 488       /* Supported by this cpu?  */
 489       if (! mt_cgen_insn_supported (cd, insn))
 490         {
 491           insn_list = CGEN_DIS_NEXT_INSN (insn_list);
 492           continue;
 493         }
 494 #endif
 495
 496       /* Basic bit mask must be correct.  */
 497       /* ??? May wish to allow target to defer this check until the extract
 498          handler.  */
 499
 500       /* Base size may exceed this instruction's size.  Extract the
 501          relevant part from the buffer. */
 502       if ((unsigned) (CGEN_INSN_BITSIZE (insn) / 8) < buflen &&
 503           (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
 504         insn_value_cropped = bfd_get_bits (buf, CGEN_INSN_BITSIZE (insn),
 505                                            info->endian == BFD_ENDIAN_BIG);
 506       else
 507         insn_value_cropped = insn_value;
 508
 509       if ((insn_value_cropped & CGEN_INSN_BASE_MASK (insn))
 510           == CGEN_INSN_BASE_VALUE (insn))
 511         {
 512           /* Printing is handled in two passes.  The first pass parses the
 513              machine insn and extracts the fields.  The second pass prints
 514              them.  */
 515
 516           /* Make sure the entire insn is loaded into insn_value, if it
 517              can fit.  */
 518           if (((unsigned) CGEN_INSN_BITSIZE (insn) > cd->base_insn_bitsize) &&
 519               (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
 520             {
 521               unsigned long full_insn_value;
 522               int rc = read_insn (cd, pc, info, buf,
 523                                   CGEN_INSN_BITSIZE (insn) / 8,
 524                                   & ex_info, & full_insn_value);
 525               if (rc != 0)
 526                 return rc;
 527               length = CGEN_EXTRACT_FN (cd, insn)
 528                 (cd, insn, &ex_info, full_insn_value, &fields, pc);
 529             }
 530           else
 531             length = CGEN_EXTRACT_FN (cd, insn)
 532               (cd, insn, &ex_info, insn_value_cropped, &fields, pc);
 533
 534           /* Length < 0 -> error.  */
 535           if (length < 0)
 536             return length;
 537           if (length > 0)
 538             {
 539               CGEN_PRINT_FN (cd, insn) (cd, info, insn, &fields, pc, length);
 540               /* Length is in bits, result is in bytes.  */
 541               return length / 8;
 542             }
 543         }
 544
 545       insn_list = CGEN_DIS_NEXT_INSN (insn_list);
 546     }
 547
 548   return 0;
 549 }
 550
 551 /* Default value for CGEN_PRINT_INSN.
 552    The result is the size of the insn in bytes or zero for an unknown insn
 553    or -1 if an error occured fetching bytes.  */
 554
 555 #ifndef CGEN_PRINT_INSN
 556 #define CGEN_PRINT_INSN default_print_insn
 557 #endif
 558
 559 static int
 560 default_print_insn (CGEN_CPU_DESC cd, bfd_vma pc, disassemble_info *info)
 561 {
 562   bfd_byte buf[CGEN_MAX_INSN_SIZE];
 563   int buflen;
 564   int status;
 565
 566   /* Attempt to read the base part of the insn.  */
 567   buflen = cd->base_insn_bitsize / 8;
 568   status = (*info->read_memory_func) (pc, buf, buflen, info);
 569
 570   /* Try again with the minimum part, if min < base.  */
 571   if (status != 0 && (cd->min_insn_bitsize < cd->base_insn_bitsize))
 572     {
 573       buflen = cd->min_insn_bitsize / 8;
 574       status = (*info->read_memory_func) (pc, buf, buflen, info);
 575     }
 576
 577   if (status != 0)
 578     {
 579       (*info->memory_error_func) (status, pc, info);
 580       return -1;
 581     }
 582
 583   return print_insn (cd, pc, info, buf, buflen);
 584 }
 585
 586 /* Main entry point.
 587    Print one instruction from PC on INFO->STREAM.
 588    Return the size of the instruction (in bytes).  */
 589
 590 typedef struct cpu_desc_list
 591 {
 592   struct cpu_desc_list *next;
 593   CGEN_BITSET *isa;
 594   int mach;
 595   int endian;
 596   CGEN_CPU_DESC cd;
 597 } cpu_desc_list;
 598
 599 int
 600 print_insn_mt (bfd_vma pc, disassemble_info *info)
 601 {
 602   static cpu_desc_list *cd_list = 0;
 603   cpu_desc_list *cl = 0;
 604   static CGEN_CPU_DESC cd = 0;
 605   static CGEN_BITSET *prev_isa;
 606   static int prev_mach;
 607   static int prev_endian;
 608   int length;
 609   CGEN_BITSET *isa;
 610   int mach;
 611   int endian = (info->endian == BFD_ENDIAN_BIG
 612                 ? CGEN_ENDIAN_BIG
 613                 : CGEN_ENDIAN_LITTLE);
 614   enum bfd_architecture arch;
 615
 616   /* ??? gdb will set mach but leave the architecture as "unknown" */
 617 #ifndef CGEN_BFD_ARCH
 618 #define CGEN_BFD_ARCH bfd_arch_mt
 619 #endif
 620   arch = info->arch;
 621   if (arch == bfd_arch_unknown)
 622     arch = CGEN_BFD_ARCH;
 623
 624   /* There's no standard way to compute the machine or isa number
 625      so we leave it to the target.  */
 626 #ifdef CGEN_COMPUTE_MACH
 627   mach = CGEN_COMPUTE_MACH (info);
 628 #else
 629   mach = info->mach;
 630 #endif
 631
 632 #ifdef CGEN_COMPUTE_ISA
 633   {
 634     static CGEN_BITSET *permanent_isa;
 635
 636     if (!permanent_isa)
 637       permanent_isa = cgen_bitset_create (MAX_ISAS);
 638     isa = permanent_isa;
 639     cgen_bitset_clear (isa);
 640     cgen_bitset_add (isa, CGEN_COMPUTE_ISA (info));
 641   }
 642 #else
 643   isa = info->insn_sets;
 644 #endif
 645
 646   /* If we've switched cpu's, try to find a handle we've used before */
 647   if (cd
 648       && (cgen_bitset_compare (isa, prev_isa) != 0
 649           || mach != prev_mach
 650           || endian != prev_endian))
 651     {
 652       cd = 0;
 653       for (cl = cd_list; cl; cl = cl->next)
 654         {
 655           if (cgen_bitset_compare (cl->isa, isa) == 0 &&
 656               cl->mach == mach &&
 657               cl->endian == endian)
 658             {
 659               cd = cl->cd;
 660               prev_isa = cd->isas;
 661               break;
 662             }
 663         }
 664     }
 665
 666   /* If we haven't initialized yet, initialize the opcode table.  */
 667   if (! cd)
 668     {
 669       const bfd_arch_info_type *arch_type = bfd_lookup_arch (arch, mach);
 670       const char *mach_name;
 671
 672       if (!arch_type)
 673         abort ();
 674       mach_name = arch_type->printable_name;
 675
 676       prev_isa = cgen_bitset_copy (isa);
 677       prev_mach = mach;
 678       prev_endian = endian;
 679       cd = mt_cgen_cpu_open (CGEN_CPU_OPEN_ISAS, prev_isa,
 680                                  CGEN_CPU_OPEN_BFDMACH, mach_name,
 681                                  CGEN_CPU_OPEN_ENDIAN, prev_endian,
 682                                  CGEN_CPU_OPEN_END);
 683       if (!cd)
 684         abort ();
 685
 686       /* Save this away for future reference.  */
 687       cl = xmalloc (sizeof (struct cpu_desc_list));
 688       cl->cd = cd;
 689       cl->isa = prev_isa;
 690       cl->mach = mach;
 691       cl->endian = endian;
 692       cl->next = cd_list;
 693       cd_list = cl;
 694
 695       mt_cgen_init_dis (cd);
 696     }
 697
 698   /* We try to have as much common code as possible.
 699      But at this point some targets need to take over.  */
 700   /* ??? Some targets may need a hook elsewhere.  Try to avoid this,
 701      but if not possible try to move this hook elsewhere rather than
 702      have two hooks.  */
 703   length = CGEN_PRINT_INSN (cd, pc, info);
 704   if (length > 0)
 705     return length;
 706   if (length < 0)
 707     return -1;
 708
 709   (*info->fprintf_func) (info->stream, UNKNOWN_INSN_MSG);
 710   return cd->default_insn_bitsize / 8;
 711 }