opcodes/mt-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) 1996-2021 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 "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       opcodes_error_handler
 291         (_("internal error: unrecognized field %d while printing insn"),
 292          opindex);
 293       abort ();
 294   }
 295 }
 296
 297 cgen_print_fn * const mt_cgen_print_handlers[] =
 298 {
 299   print_insn_normal,
 300 };
 301
 302
 303 void
 304 mt_cgen_init_dis (CGEN_CPU_DESC cd)
 305 {
 306   mt_cgen_init_opcode_table (cd);
 307   mt_cgen_init_ibld_table (cd);
 308   cd->print_handlers = & mt_cgen_print_handlers[0];
 309   cd->print_operand = mt_cgen_print_operand;
 310 }
 311
 312 \f
 313 /* Default print handler.  */
 314
 315 static void
 316 print_normal (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 317               void *dis_info,
 318               long value,
 319               unsigned int attrs,
 320               bfd_vma pc ATTRIBUTE_UNUSED,
 321               int length ATTRIBUTE_UNUSED)
 322 {
 323   disassemble_info *info = (disassemble_info *) dis_info;
 324
 325   /* Print the operand as directed by the attributes.  */
 326   if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
 327     ; /* nothing to do */
 328   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
 329     (*info->fprintf_func) (info->stream, "%ld", value);
 330   else
 331     (*info->fprintf_func) (info->stream, "0x%lx", value);
 332 }
 333
 334 /* Default address handler.  */
 335
 336 static void
 337 print_address (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 338                void *dis_info,
 339                bfd_vma value,
 340                unsigned int attrs,
 341                bfd_vma pc ATTRIBUTE_UNUSED,
 342                int length ATTRIBUTE_UNUSED)
 343 {
 344   disassemble_info *info = (disassemble_info *) dis_info;
 345
 346   /* Print the operand as directed by the attributes.  */
 347   if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
 348     ; /* Nothing to do.  */
 349   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_PCREL_ADDR))
 350     (*info->print_address_func) (value, info);
 351   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_ABS_ADDR))
 352     (*info->print_address_func) (value, info);
 353   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
 354     (*info->fprintf_func) (info->stream, "%ld", (long) value);
 355   else
 356     (*info->fprintf_func) (info->stream, "0x%lx", (long) value);
 357 }
 358
 359 /* Keyword print handler.  */
 360
 361 static void
 362 print_keyword (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 363                void *dis_info,
 364                CGEN_KEYWORD *keyword_table,
 365                long value,
 366                unsigned int attrs ATTRIBUTE_UNUSED)
 367 {
 368   disassemble_info *info = (disassemble_info *) dis_info;
 369   const CGEN_KEYWORD_ENTRY *ke;
 370
 371   ke = cgen_keyword_lookup_value (keyword_table, value);
 372   if (ke != NULL)
 373     (*info->fprintf_func) (info->stream, "%s", ke->name);
 374   else
 375     (*info->fprintf_func) (info->stream, "???");
 376 }
 377 \f
 378 /* Default insn printer.
 379
 380    DIS_INFO is defined as `void *' so the disassembler needn't know anything
 381    about disassemble_info.  */
 382
 383 static void
 384 print_insn_normal (CGEN_CPU_DESC cd,
 385                    void *dis_info,
 386                    const CGEN_INSN *insn,
 387                    CGEN_FIELDS *fields,
 388                    bfd_vma pc,
 389                    int length)
 390 {
 391   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 392   disassemble_info *info = (disassemble_info *) dis_info;
 393   const CGEN_SYNTAX_CHAR_TYPE *syn;
 394
 395   CGEN_INIT_PRINT (cd);
 396
 397   for (syn = CGEN_SYNTAX_STRING (syntax); *syn; ++syn)
 398     {
 399       if (CGEN_SYNTAX_MNEMONIC_P (*syn))
 400         {
 401           (*info->fprintf_func) (info->stream, "%s", CGEN_INSN_MNEMONIC (insn));
 402           continue;
 403         }
 404       if (CGEN_SYNTAX_CHAR_P (*syn))
 405         {
 406           (*info->fprintf_func) (info->stream, "%c", CGEN_SYNTAX_CHAR (*syn));
 407           continue;
 408         }
 409
 410       /* We have an operand.  */
 411       mt_cgen_print_operand (cd, CGEN_SYNTAX_FIELD (*syn), info,
 412                                  fields, CGEN_INSN_ATTRS (insn), pc, length);
 413     }
 414 }
 415 \f
 416 /* Subroutine of print_insn. Reads an insn into the given buffers and updates
 417    the extract info.
 418    Returns 0 if all is well, non-zero otherwise.  */
 419
 420 static int
 421 read_insn (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 422            bfd_vma pc,
 423            disassemble_info *info,
 424            bfd_byte *buf,
 425            int buflen,
 426            CGEN_EXTRACT_INFO *ex_info,
 427            unsigned long *insn_value)
 428 {
 429   int status = (*info->read_memory_func) (pc, buf, buflen, info);
 430
 431   if (status != 0)
 432     {
 433       (*info->memory_error_func) (status, pc, info);
 434       return -1;
 435     }
 436
 437   ex_info->dis_info = info;
 438   ex_info->valid = (1 << buflen) - 1;
 439   ex_info->insn_bytes = buf;
 440
 441   *insn_value = bfd_get_bits (buf, buflen * 8, info->endian == BFD_ENDIAN_BIG);
 442   return 0;
 443 }
 444
 445 /* Utility to print an insn.
 446    BUF is the base part of the insn, target byte order, BUFLEN bytes long.
 447    The result is the size of the insn in bytes or zero for an unknown insn
 448    or -1 if an error occurs fetching data (memory_error_func will have
 449    been called).  */
 450
 451 static int
 452 print_insn (CGEN_CPU_DESC cd,
 453             bfd_vma pc,
 454             disassemble_info *info,
 455             bfd_byte *buf,
 456             unsigned int buflen)
 457 {
 458   CGEN_INSN_INT insn_value;
 459   const CGEN_INSN_LIST *insn_list;
 460   CGEN_EXTRACT_INFO ex_info;
 461   int basesize;
 462
 463   /* Extract base part of instruction, just in case CGEN_DIS_* uses it. */
 464   basesize = cd->base_insn_bitsize < buflen * 8 ?
 465                                      cd->base_insn_bitsize : buflen * 8;
 466   insn_value = cgen_get_insn_value (cd, buf, basesize, cd->insn_endian);
 467
 468
 469   /* Fill in ex_info fields like read_insn would.  Don't actually call
 470      read_insn, since the incoming buffer is already read (and possibly
 471      modified a la m32r).  */
 472   ex_info.valid = (1 << buflen) - 1;
 473   ex_info.dis_info = info;
 474   ex_info.insn_bytes = buf;
 475
 476   /* The instructions are stored in hash lists.
 477      Pick the first one and keep trying until we find the right one.  */
 478
 479   insn_list = CGEN_DIS_LOOKUP_INSN (cd, (char *) buf, insn_value);
 480   while (insn_list != NULL)
 481     {
 482       const CGEN_INSN *insn = insn_list->insn;
 483       CGEN_FIELDS fields;
 484       int length;
 485       unsigned long insn_value_cropped;
 486
 487 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 488       /* Not needed as insn shouldn't be in hash lists if not supported.  */
 489       /* Supported by this cpu?  */
 490       if (! mt_cgen_insn_supported (cd, insn))
 491         {
 492           insn_list = CGEN_DIS_NEXT_INSN (insn_list);
 493           continue;
 494         }
 495 #endif
 496
 497       /* Basic bit mask must be correct.  */
 498       /* ??? May wish to allow target to defer this check until the extract
 499          handler.  */
 500
 501       /* Base size may exceed this instruction's size.  Extract the
 502          relevant part from the buffer. */
 503       if ((unsigned) (CGEN_INSN_BITSIZE (insn) / 8) < buflen &&
 504           (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
 505         insn_value_cropped = bfd_get_bits (buf, CGEN_INSN_BITSIZE (insn),
 506                                            info->endian == BFD_ENDIAN_BIG);
 507       else
 508         insn_value_cropped = insn_value;
 509
 510       if ((insn_value_cropped & CGEN_INSN_BASE_MASK (insn))
 511           == CGEN_INSN_BASE_VALUE (insn))
 512         {
 513           /* Printing is handled in two passes.  The first pass parses the
 514              machine insn and extracts the fields.  The second pass prints
 515              them.  */
 516
 517           /* Make sure the entire insn is loaded into insn_value, if it
 518              can fit.  */
 519           if (((unsigned) CGEN_INSN_BITSIZE (insn) > cd->base_insn_bitsize) &&
 520               (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
 521             {
 522               unsigned long full_insn_value;
 523               int rc = read_insn (cd, pc, info, buf,
 524                                   CGEN_INSN_BITSIZE (insn) / 8,
 525                                   & ex_info, & full_insn_value);
 526               if (rc != 0)
 527                 return rc;
 528               length = CGEN_EXTRACT_FN (cd, insn)
 529                 (cd, insn, &ex_info, full_insn_value, &fields, pc);
 530             }
 531           else
 532             length = CGEN_EXTRACT_FN (cd, insn)
 533               (cd, insn, &ex_info, insn_value_cropped, &fields, pc);
 534
 535           /* Length < 0 -> error.  */
 536           if (length < 0)
 537             return length;
 538           if (length > 0)
 539             {
 540               CGEN_PRINT_FN (cd, insn) (cd, info, insn, &fields, pc, length);
 541               /* Length is in bits, result is in bytes.  */
 542               return length / 8;
 543             }
 544         }
 545
 546       insn_list = CGEN_DIS_NEXT_INSN (insn_list);
 547     }
 548
 549   return 0;
 550 }
 551
 552 /* Default value for CGEN_PRINT_INSN.
 553    The result is the size of the insn in bytes or zero for an unknown insn
 554    or -1 if an error occured fetching bytes.  */
 555
 556 #ifndef CGEN_PRINT_INSN
 557 #define CGEN_PRINT_INSN default_print_insn
 558 #endif
 559
 560 static int
 561 default_print_insn (CGEN_CPU_DESC cd, bfd_vma pc, disassemble_info *info)
 562 {
 563   bfd_byte buf[CGEN_MAX_INSN_SIZE];
 564   int buflen;
 565   int status;
 566
 567   /* Attempt to read the base part of the insn.  */
 568   buflen = cd->base_insn_bitsize / 8;
 569   status = (*info->read_memory_func) (pc, buf, buflen, info);
 570
 571   /* Try again with the minimum part, if min < base.  */
 572   if (status != 0 && (cd->min_insn_bitsize < cd->base_insn_bitsize))
 573     {
 574       buflen = cd->min_insn_bitsize / 8;
 575       status = (*info->read_memory_func) (pc, buf, buflen, info);
 576     }
 577
 578   if (status != 0)
 579     {
 580       (*info->memory_error_func) (status, pc, info);
 581       return -1;
 582     }
 583
 584   return print_insn (cd, pc, info, buf, buflen);
 585 }
 586
 587 /* Main entry point.
 588    Print one instruction from PC on INFO->STREAM.
 589    Return the size of the instruction (in bytes).  */
 590
 591 typedef struct cpu_desc_list
 592 {
 593   struct cpu_desc_list *next;
 594   CGEN_BITSET *isa;
 595   int mach;
 596   int endian;
 597   int insn_endian;
 598   CGEN_CPU_DESC cd;
 599 } cpu_desc_list;
 600
 601 int
 602 print_insn_mt (bfd_vma pc, disassemble_info *info)
 603 {
 604   static cpu_desc_list *cd_list = 0;
 605   cpu_desc_list *cl = 0;
 606   static CGEN_CPU_DESC cd = 0;
 607   static CGEN_BITSET *prev_isa;
 608   static int prev_mach;
 609   static int prev_endian;
 610   static int prev_insn_endian;
 611   int length;
 612   CGEN_BITSET *isa;
 613   int mach;
 614   int endian = (info->endian == BFD_ENDIAN_BIG
 615                 ? CGEN_ENDIAN_BIG
 616                 : CGEN_ENDIAN_LITTLE);
 617   int insn_endian = (info->endian_code == BFD_ENDIAN_BIG
 618                      ? CGEN_ENDIAN_BIG
 619                      : CGEN_ENDIAN_LITTLE);
 620   enum bfd_architecture arch;
 621
 622   /* ??? gdb will set mach but leave the architecture as "unknown" */
 623 #ifndef CGEN_BFD_ARCH
 624 #define CGEN_BFD_ARCH bfd_arch_mt
 625 #endif
 626   arch = info->arch;
 627   if (arch == bfd_arch_unknown)
 628     arch = CGEN_BFD_ARCH;
 629
 630   /* There's no standard way to compute the machine or isa number
 631      so we leave it to the target.  */
 632 #ifdef CGEN_COMPUTE_MACH
 633   mach = CGEN_COMPUTE_MACH (info);
 634 #else
 635   mach = info->mach;
 636 #endif
 637
 638 #ifdef CGEN_COMPUTE_ISA
 639   {
 640     static CGEN_BITSET *permanent_isa;
 641
 642     if (!permanent_isa)
 643       permanent_isa = cgen_bitset_create (MAX_ISAS);
 644     isa = permanent_isa;
 645     cgen_bitset_clear (isa);
 646     cgen_bitset_add (isa, CGEN_COMPUTE_ISA (info));
 647   }
 648 #else
 649   isa = info->private_data;
 650 #endif
 651
 652   /* If we've switched cpu's, try to find a handle we've used before */
 653   if (cd
 654       && (cgen_bitset_compare (isa, prev_isa) != 0
 655           || mach != prev_mach
 656           || endian != prev_endian))
 657     {
 658       cd = 0;
 659       for (cl = cd_list; cl; cl = cl->next)
 660         {
 661           if (cgen_bitset_compare (cl->isa, isa) == 0 &&
 662               cl->mach == mach &&
 663               cl->endian == endian)
 664             {
 665               cd = cl->cd;
 666               prev_isa = cd->isas;
 667               break;
 668             }
 669         }
 670     }
 671
 672   /* If we haven't initialized yet, initialize the opcode table.  */
 673   if (! cd)
 674     {
 675       const bfd_arch_info_type *arch_type = bfd_lookup_arch (arch, mach);
 676       const char *mach_name;
 677
 678       if (!arch_type)
 679         abort ();
 680       mach_name = arch_type->printable_name;
 681
 682       prev_isa = cgen_bitset_copy (isa);
 683       prev_mach = mach;
 684       prev_endian = endian;
 685       prev_insn_endian = insn_endian;
 686       cd = mt_cgen_cpu_open (CGEN_CPU_OPEN_ISAS, prev_isa,
 687                                  CGEN_CPU_OPEN_BFDMACH, mach_name,
 688                                  CGEN_CPU_OPEN_ENDIAN, prev_endian,
 689                                  CGEN_CPU_OPEN_INSN_ENDIAN, prev_insn_endian,
 690                                  CGEN_CPU_OPEN_END);
 691       if (!cd)
 692         abort ();
 693
 694       /* Save this away for future reference.  */
 695       cl = xmalloc (sizeof (struct cpu_desc_list));
 696       cl->cd = cd;
 697       cl->isa = prev_isa;
 698       cl->mach = mach;
 699       cl->endian = endian;
 700       cl->next = cd_list;
 701       cd_list = cl;
 702
 703       mt_cgen_init_dis (cd);
 704     }
 705
 706   /* We try to have as much common code as possible.
 707      But at this point some targets need to take over.  */
 708   /* ??? Some targets may need a hook elsewhere.  Try to avoid this,
 709      but if not possible try to move this hook elsewhere rather than
 710      have two hooks.  */
 711   length = CGEN_PRINT_INSN (cd, pc, info);
 712   if (length > 0)
 713     return length;
 714   if (length < 0)
 715     return -1;
 716
 717   (*info->fprintf_func) (info->stream, UNKNOWN_INSN_MSG);
 718   return cd->default_insn_bitsize / 8;
 719 }