opcodes/m32r-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, 2005
   8    Free Software Foundation, Inc.
   9
  10    This file is part of the GNU Binutils and GDB, the GNU debugger.
  11
  12    This program 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 2, or (at your option)
  15    any later version.
  16
  17    This program is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20    GNU General Public 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 "m32r-desc.h"
  37 #include "m32r-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 /* Immediate values are prefixed with '#'.  */
  63
  64 #define CGEN_PRINT_NORMAL(cd, info, value, attrs, pc, length)   \
  65   do                                                            \
  66     {                                                           \
  67       if (CGEN_BOOL_ATTR ((attrs), CGEN_OPERAND_HASH_PREFIX))   \
  68         (*info->fprintf_func) (info->stream, "#");              \
  69     }                                                           \
  70   while (0)
  71
  72 /* Handle '#' prefixes as operands.  */
  73
  74 static void
  75 print_hash (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
  76             void * dis_info,
  77             long value ATTRIBUTE_UNUSED,
  78             unsigned int attrs ATTRIBUTE_UNUSED,
  79             bfd_vma pc ATTRIBUTE_UNUSED,
  80             int length ATTRIBUTE_UNUSED)
  81 {
  82   disassemble_info *info = (disassemble_info *) dis_info;
  83
  84   (*info->fprintf_func) (info->stream, "#");
  85 }
  86
  87 #undef  CGEN_PRINT_INSN
  88 #define CGEN_PRINT_INSN my_print_insn
  89
  90 static int
  91 my_print_insn (CGEN_CPU_DESC cd,
  92                bfd_vma pc,
  93                disassemble_info *info)
  94 {
  95   bfd_byte buffer[CGEN_MAX_INSN_SIZE];
  96   bfd_byte *buf = buffer;
  97   int status;
  98   int buflen = (pc & 3) == 0 ? 4 : 2;
  99   int big_p = CGEN_CPU_INSN_ENDIAN (cd) == CGEN_ENDIAN_BIG;
 100   bfd_byte *x;
 101
 102   /* Read the base part of the insn.  */
 103
 104   status = (*info->read_memory_func) (pc - ((!big_p && (pc & 3) != 0) ? 2 : 0),
 105                                       buf, buflen, info);
 106   if (status != 0)
 107     {
 108       (*info->memory_error_func) (status, pc, info);
 109       return -1;
 110     }
 111
 112   /* 32 bit insn?  */
 113   x = (big_p ? &buf[0] : &buf[3]);
 114   if ((pc & 3) == 0 && (*x & 0x80) != 0)
 115     return print_insn (cd, pc, info, buf, buflen);
 116
 117   /* Print the first insn.  */
 118   if ((pc & 3) == 0)
 119     {
 120       buf += (big_p ? 0 : 2);
 121       if (print_insn (cd, pc, info, buf, 2) == 0)
 122         (*info->fprintf_func) (info->stream, UNKNOWN_INSN_MSG);
 123       buf += (big_p ? 2 : -2);
 124     }
 125
 126   x = (big_p ? &buf[0] : &buf[1]);
 127   if (*x & 0x80)
 128     {
 129       /* Parallel.  */
 130       (*info->fprintf_func) (info->stream, " || ");
 131       *x &= 0x7f;
 132     }
 133   else
 134     (*info->fprintf_func) (info->stream, " -> ");
 135
 136   /* The "& 3" is to pass a consistent address.
 137      Parallel insns arguably both begin on the word boundary.
 138      Also, branch insns are calculated relative to the word boundary.  */
 139   if (print_insn (cd, pc & ~ (bfd_vma) 3, info, buf, 2) == 0)
 140     (*info->fprintf_func) (info->stream, UNKNOWN_INSN_MSG);
 141
 142   return (pc & 3) ? 2 : 4;
 143 }
 144
 145 /* -- */
 146
 147 void m32r_cgen_print_operand
 148   (CGEN_CPU_DESC, int, PTR, CGEN_FIELDS *, void const *, bfd_vma, int);
 149
 150 /* Main entry point for printing operands.
 151    XINFO is a `void *' and not a `disassemble_info *' to not put a requirement
 152    of dis-asm.h on cgen.h.
 153
 154    This function is basically just a big switch statement.  Earlier versions
 155    used tables to look up the function to use, but
 156    - if the table contains both assembler and disassembler functions then
 157      the disassembler contains much of the assembler and vice-versa,
 158    - there's a lot of inlining possibilities as things grow,
 159    - using a switch statement avoids the function call overhead.
 160
 161    This function could be moved into `print_insn_normal', but keeping it
 162    separate makes clear the interface between `print_insn_normal' and each of
 163    the handlers.  */
 164
 165 void
 166 m32r_cgen_print_operand (CGEN_CPU_DESC cd,
 167                            int opindex,
 168                            void * xinfo,
 169                            CGEN_FIELDS *fields,
 170                            void const *attrs ATTRIBUTE_UNUSED,
 171                            bfd_vma pc,
 172                            int length)
 173 {
 174   disassemble_info *info = (disassemble_info *) xinfo;
 175
 176   switch (opindex)
 177     {
 178     case M32R_OPERAND_ACC :
 179       print_keyword (cd, info, & m32r_cgen_opval_h_accums, fields->f_acc, 0);
 180       break;
 181     case M32R_OPERAND_ACCD :
 182       print_keyword (cd, info, & m32r_cgen_opval_h_accums, fields->f_accd, 0);
 183       break;
 184     case M32R_OPERAND_ACCS :
 185       print_keyword (cd, info, & m32r_cgen_opval_h_accums, fields->f_accs, 0);
 186       break;
 187     case M32R_OPERAND_DCR :
 188       print_keyword (cd, info, & m32r_cgen_opval_cr_names, fields->f_r1, 0);
 189       break;
 190     case M32R_OPERAND_DISP16 :
 191       print_address (cd, info, fields->f_disp16, 0|(1<<CGEN_OPERAND_RELOC)|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
 192       break;
 193     case M32R_OPERAND_DISP24 :
 194       print_address (cd, info, fields->f_disp24, 0|(1<<CGEN_OPERAND_RELAX)|(1<<CGEN_OPERAND_RELOC)|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
 195       break;
 196     case M32R_OPERAND_DISP8 :
 197       print_address (cd, info, fields->f_disp8, 0|(1<<CGEN_OPERAND_RELAX)|(1<<CGEN_OPERAND_RELOC)|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
 198       break;
 199     case M32R_OPERAND_DR :
 200       print_keyword (cd, info, & m32r_cgen_opval_gr_names, fields->f_r1, 0);
 201       break;
 202     case M32R_OPERAND_HASH :
 203       print_hash (cd, info, 0, 0|(1<<CGEN_OPERAND_SIGNED), pc, length);
 204       break;
 205     case M32R_OPERAND_HI16 :
 206       print_normal (cd, info, fields->f_hi16, 0|(1<<CGEN_OPERAND_SIGN_OPT), pc, length);
 207       break;
 208     case M32R_OPERAND_IMM1 :
 209       print_normal (cd, info, fields->f_imm1, 0|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
 210       break;
 211     case M32R_OPERAND_SCR :
 212       print_keyword (cd, info, & m32r_cgen_opval_cr_names, fields->f_r2, 0);
 213       break;
 214     case M32R_OPERAND_SIMM16 :
 215       print_normal (cd, info, fields->f_simm16, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
 216       break;
 217     case M32R_OPERAND_SIMM8 :
 218       print_normal (cd, info, fields->f_simm8, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
 219       break;
 220     case M32R_OPERAND_SLO16 :
 221       print_normal (cd, info, fields->f_simm16, 0|(1<<CGEN_OPERAND_SIGNED), pc, length);
 222       break;
 223     case M32R_OPERAND_SR :
 224       print_keyword (cd, info, & m32r_cgen_opval_gr_names, fields->f_r2, 0);
 225       break;
 226     case M32R_OPERAND_SRC1 :
 227       print_keyword (cd, info, & m32r_cgen_opval_gr_names, fields->f_r1, 0);
 228       break;
 229     case M32R_OPERAND_SRC2 :
 230       print_keyword (cd, info, & m32r_cgen_opval_gr_names, fields->f_r2, 0);
 231       break;
 232     case M32R_OPERAND_UIMM16 :
 233       print_normal (cd, info, fields->f_uimm16, 0|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
 234       break;
 235     case M32R_OPERAND_UIMM24 :
 236       print_address (cd, info, fields->f_uimm24, 0|(1<<CGEN_OPERAND_HASH_PREFIX)|(1<<CGEN_OPERAND_RELOC)|(1<<CGEN_OPERAND_ABS_ADDR), pc, length);
 237       break;
 238     case M32R_OPERAND_UIMM3 :
 239       print_normal (cd, info, fields->f_uimm3, 0|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
 240       break;
 241     case M32R_OPERAND_UIMM4 :
 242       print_normal (cd, info, fields->f_uimm4, 0|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
 243       break;
 244     case M32R_OPERAND_UIMM5 :
 245       print_normal (cd, info, fields->f_uimm5, 0|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
 246       break;
 247     case M32R_OPERAND_UIMM8 :
 248       print_normal (cd, info, fields->f_uimm8, 0|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
 249       break;
 250     case M32R_OPERAND_ULO16 :
 251       print_normal (cd, info, fields->f_uimm16, 0, pc, length);
 252       break;
 253
 254     default :
 255       /* xgettext:c-format */
 256       fprintf (stderr, _("Unrecognized field %d while printing insn.\n"),
 257                opindex);
 258     abort ();
 259   }
 260 }
 261
 262 cgen_print_fn * const m32r_cgen_print_handlers[] =
 263 {
 264   print_insn_normal,
 265 };
 266
 267
 268 void
 269 m32r_cgen_init_dis (CGEN_CPU_DESC cd)
 270 {
 271   m32r_cgen_init_opcode_table (cd);
 272   m32r_cgen_init_ibld_table (cd);
 273   cd->print_handlers = & m32r_cgen_print_handlers[0];
 274   cd->print_operand = m32r_cgen_print_operand;
 275 }
 276
 277 \f
 278 /* Default print handler.  */
 279
 280 static void
 281 print_normal (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 282               void *dis_info,
 283               long value,
 284               unsigned int attrs,
 285               bfd_vma pc ATTRIBUTE_UNUSED,
 286               int length ATTRIBUTE_UNUSED)
 287 {
 288   disassemble_info *info = (disassemble_info *) dis_info;
 289
 290 #ifdef CGEN_PRINT_NORMAL
 291   CGEN_PRINT_NORMAL (cd, info, value, attrs, pc, length);
 292 #endif
 293
 294   /* Print the operand as directed by the attributes.  */
 295   if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
 296     ; /* nothing to do */
 297   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
 298     (*info->fprintf_func) (info->stream, "%ld", value);
 299   else
 300     (*info->fprintf_func) (info->stream, "0x%lx", value);
 301 }
 302
 303 /* Default address handler.  */
 304
 305 static void
 306 print_address (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 307                void *dis_info,
 308                bfd_vma value,
 309                unsigned int attrs,
 310                bfd_vma pc ATTRIBUTE_UNUSED,
 311                int length ATTRIBUTE_UNUSED)
 312 {
 313   disassemble_info *info = (disassemble_info *) dis_info;
 314
 315 #ifdef CGEN_PRINT_ADDRESS
 316   CGEN_PRINT_ADDRESS (cd, info, value, attrs, pc, length);
 317 #endif
 318
 319   /* Print the operand as directed by the attributes.  */
 320   if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
 321     ; /* Nothing to do.  */
 322   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_PCREL_ADDR))
 323     (*info->print_address_func) (value, info);
 324   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_ABS_ADDR))
 325     (*info->print_address_func) (value, info);
 326   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
 327     (*info->fprintf_func) (info->stream, "%ld", (long) value);
 328   else
 329     (*info->fprintf_func) (info->stream, "0x%lx", (long) value);
 330 }
 331
 332 /* Keyword print handler.  */
 333
 334 static void
 335 print_keyword (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 336                void *dis_info,
 337                CGEN_KEYWORD *keyword_table,
 338                long value,
 339                unsigned int attrs ATTRIBUTE_UNUSED)
 340 {
 341   disassemble_info *info = (disassemble_info *) dis_info;
 342   const CGEN_KEYWORD_ENTRY *ke;
 343
 344   ke = cgen_keyword_lookup_value (keyword_table, value);
 345   if (ke != NULL)
 346     (*info->fprintf_func) (info->stream, "%s", ke->name);
 347   else
 348     (*info->fprintf_func) (info->stream, "???");
 349 }
 350 \f
 351 /* Default insn printer.
 352
 353    DIS_INFO is defined as `void *' so the disassembler needn't know anything
 354    about disassemble_info.  */
 355
 356 static void
 357 print_insn_normal (CGEN_CPU_DESC cd,
 358                    void *dis_info,
 359                    const CGEN_INSN *insn,
 360                    CGEN_FIELDS *fields,
 361                    bfd_vma pc,
 362                    int length)
 363 {
 364   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 365   disassemble_info *info = (disassemble_info *) dis_info;
 366   const CGEN_SYNTAX_CHAR_TYPE *syn;
 367
 368   CGEN_INIT_PRINT (cd);
 369
 370   for (syn = CGEN_SYNTAX_STRING (syntax); *syn; ++syn)
 371     {
 372       if (CGEN_SYNTAX_MNEMONIC_P (*syn))
 373         {
 374           (*info->fprintf_func) (info->stream, "%s", CGEN_INSN_MNEMONIC (insn));
 375           continue;
 376         }
 377       if (CGEN_SYNTAX_CHAR_P (*syn))
 378         {
 379           (*info->fprintf_func) (info->stream, "%c", CGEN_SYNTAX_CHAR (*syn));
 380           continue;
 381         }
 382
 383       /* We have an operand.  */
 384       m32r_cgen_print_operand (cd, CGEN_SYNTAX_FIELD (*syn), info,
 385                                  fields, CGEN_INSN_ATTRS (insn), pc, length);
 386     }
 387 }
 388 \f
 389 /* Subroutine of print_insn. Reads an insn into the given buffers and updates
 390    the extract info.
 391    Returns 0 if all is well, non-zero otherwise.  */
 392
 393 static int
 394 read_insn (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 395            bfd_vma pc,
 396            disassemble_info *info,
 397            bfd_byte *buf,
 398            int buflen,
 399            CGEN_EXTRACT_INFO *ex_info,
 400            unsigned long *insn_value)
 401 {
 402   int status = (*info->read_memory_func) (pc, buf, buflen, info);
 403
 404   if (status != 0)
 405     {
 406       (*info->memory_error_func) (status, pc, info);
 407       return -1;
 408     }
 409
 410   ex_info->dis_info = info;
 411   ex_info->valid = (1 << buflen) - 1;
 412   ex_info->insn_bytes = buf;
 413
 414   *insn_value = bfd_get_bits (buf, buflen * 8, info->endian == BFD_ENDIAN_BIG);
 415   return 0;
 416 }
 417
 418 /* Utility to print an insn.
 419    BUF is the base part of the insn, target byte order, BUFLEN bytes long.
 420    The result is the size of the insn in bytes or zero for an unknown insn
 421    or -1 if an error occurs fetching data (memory_error_func will have
 422    been called).  */
 423
 424 static int
 425 print_insn (CGEN_CPU_DESC cd,
 426             bfd_vma pc,
 427             disassemble_info *info,
 428             bfd_byte *buf,
 429             unsigned int buflen)
 430 {
 431   CGEN_INSN_INT insn_value;
 432   const CGEN_INSN_LIST *insn_list;
 433   CGEN_EXTRACT_INFO ex_info;
 434   int basesize;
 435
 436   /* Extract base part of instruction, just in case CGEN_DIS_* uses it. */
 437   basesize = cd->base_insn_bitsize < buflen * 8 ?
 438                                      cd->base_insn_bitsize : buflen * 8;
 439   insn_value = cgen_get_insn_value (cd, buf, basesize);
 440
 441
 442   /* Fill in ex_info fields like read_insn would.  Don't actually call
 443      read_insn, since the incoming buffer is already read (and possibly
 444      modified a la m32r).  */
 445   ex_info.valid = (1 << buflen) - 1;
 446   ex_info.dis_info = info;
 447   ex_info.insn_bytes = buf;
 448
 449   /* The instructions are stored in hash lists.
 450      Pick the first one and keep trying until we find the right one.  */
 451
 452   insn_list = CGEN_DIS_LOOKUP_INSN (cd, (char *) buf, insn_value);
 453   while (insn_list != NULL)
 454     {
 455       const CGEN_INSN *insn = insn_list->insn;
 456       CGEN_FIELDS fields;
 457       int length;
 458       unsigned long insn_value_cropped;
 459
 460 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 461       /* Not needed as insn shouldn't be in hash lists if not supported.  */
 462       /* Supported by this cpu?  */
 463       if (! m32r_cgen_insn_supported (cd, insn))
 464         {
 465           insn_list = CGEN_DIS_NEXT_INSN (insn_list);
 466           continue;
 467         }
 468 #endif
 469
 470       /* Basic bit mask must be correct.  */
 471       /* ??? May wish to allow target to defer this check until the extract
 472          handler.  */
 473
 474       /* Base size may exceed this instruction's size.  Extract the
 475          relevant part from the buffer. */
 476       if ((unsigned) (CGEN_INSN_BITSIZE (insn) / 8) < buflen &&
 477           (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
 478         insn_value_cropped = bfd_get_bits (buf, CGEN_INSN_BITSIZE (insn),
 479                                            info->endian == BFD_ENDIAN_BIG);
 480       else
 481         insn_value_cropped = insn_value;
 482
 483       if ((insn_value_cropped & CGEN_INSN_BASE_MASK (insn))
 484           == CGEN_INSN_BASE_VALUE (insn))
 485         {
 486           /* Printing is handled in two passes.  The first pass parses the
 487              machine insn and extracts the fields.  The second pass prints
 488              them.  */
 489
 490           /* Make sure the entire insn is loaded into insn_value, if it
 491              can fit.  */
 492           if (((unsigned) CGEN_INSN_BITSIZE (insn) > cd->base_insn_bitsize) &&
 493               (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
 494             {
 495               unsigned long full_insn_value;
 496               int rc = read_insn (cd, pc, info, buf,
 497                                   CGEN_INSN_BITSIZE (insn) / 8,
 498                                   & ex_info, & full_insn_value);
 499               if (rc != 0)
 500                 return rc;
 501               length = CGEN_EXTRACT_FN (cd, insn)
 502                 (cd, insn, &ex_info, full_insn_value, &fields, pc);
 503             }
 504           else
 505             length = CGEN_EXTRACT_FN (cd, insn)
 506               (cd, insn, &ex_info, insn_value_cropped, &fields, pc);
 507
 508           /* Length < 0 -> error.  */
 509           if (length < 0)
 510             return length;
 511           if (length > 0)
 512             {
 513               CGEN_PRINT_FN (cd, insn) (cd, info, insn, &fields, pc, length);
 514               /* Length is in bits, result is in bytes.  */
 515               return length / 8;
 516             }
 517         }
 518
 519       insn_list = CGEN_DIS_NEXT_INSN (insn_list);
 520     }
 521
 522   return 0;
 523 }
 524
 525 /* Default value for CGEN_PRINT_INSN.
 526    The result is the size of the insn in bytes or zero for an unknown insn
 527    or -1 if an error occured fetching bytes.  */
 528
 529 #ifndef CGEN_PRINT_INSN
 530 #define CGEN_PRINT_INSN default_print_insn
 531 #endif
 532
 533 static int
 534 default_print_insn (CGEN_CPU_DESC cd, bfd_vma pc, disassemble_info *info)
 535 {
 536   bfd_byte buf[CGEN_MAX_INSN_SIZE];
 537   int buflen;
 538   int status;
 539
 540   /* Attempt to read the base part of the insn.  */
 541   buflen = cd->base_insn_bitsize / 8;
 542   status = (*info->read_memory_func) (pc, buf, buflen, info);
 543
 544   /* Try again with the minimum part, if min < base.  */
 545   if (status != 0 && (cd->min_insn_bitsize < cd->base_insn_bitsize))
 546     {
 547       buflen = cd->min_insn_bitsize / 8;
 548       status = (*info->read_memory_func) (pc, buf, buflen, info);
 549     }
 550
 551   if (status != 0)
 552     {
 553       (*info->memory_error_func) (status, pc, info);
 554       return -1;
 555     }
 556
 557   return print_insn (cd, pc, info, buf, buflen);
 558 }
 559
 560 /* Main entry point.
 561    Print one instruction from PC on INFO->STREAM.
 562    Return the size of the instruction (in bytes).  */
 563
 564 typedef struct cpu_desc_list
 565 {
 566   struct cpu_desc_list *next;
 567   int isa;
 568   int mach;
 569   int endian;
 570   CGEN_CPU_DESC cd;
 571 } cpu_desc_list;
 572
 573 int
 574 print_insn_m32r (bfd_vma pc, disassemble_info *info)
 575 {
 576   static cpu_desc_list *cd_list = 0;
 577   cpu_desc_list *cl = 0;
 578   static CGEN_CPU_DESC cd = 0;
 579   static int prev_isa;
 580   static int prev_mach;
 581   static int prev_endian;
 582   int length;
 583   int isa,mach;
 584   int endian = (info->endian == BFD_ENDIAN_BIG
 585                 ? CGEN_ENDIAN_BIG
 586                 : CGEN_ENDIAN_LITTLE);
 587   enum bfd_architecture arch;
 588
 589   /* ??? gdb will set mach but leave the architecture as "unknown" */
 590 #ifndef CGEN_BFD_ARCH
 591 #define CGEN_BFD_ARCH bfd_arch_m32r
 592 #endif
 593   arch = info->arch;
 594   if (arch == bfd_arch_unknown)
 595     arch = CGEN_BFD_ARCH;
 596
 597   /* There's no standard way to compute the machine or isa number
 598      so we leave it to the target.  */
 599 #ifdef CGEN_COMPUTE_MACH
 600   mach = CGEN_COMPUTE_MACH (info);
 601 #else
 602   mach = info->mach;
 603 #endif
 604
 605 #ifdef CGEN_COMPUTE_ISA
 606   isa = CGEN_COMPUTE_ISA (info);
 607 #else
 608   isa = info->insn_sets;
 609 #endif
 610
 611   /* If we've switched cpu's, try to find a handle we've used before */
 612   if (cd
 613       && (isa != prev_isa
 614           || mach != prev_mach
 615           || endian != prev_endian))
 616     {
 617       cd = 0;
 618       for (cl = cd_list; cl; cl = cl->next)
 619         {
 620           if (cl->isa == isa &&
 621               cl->mach == mach &&
 622               cl->endian == endian)
 623             {
 624               cd = cl->cd;
 625               break;
 626             }
 627         }
 628     }
 629
 630   /* If we haven't initialized yet, initialize the opcode table.  */
 631   if (! cd)
 632     {
 633       const bfd_arch_info_type *arch_type = bfd_lookup_arch (arch, mach);
 634       const char *mach_name;
 635
 636       if (!arch_type)
 637         abort ();
 638       mach_name = arch_type->printable_name;
 639
 640       prev_isa = isa;
 641       prev_mach = mach;
 642       prev_endian = endian;
 643       cd = m32r_cgen_cpu_open (CGEN_CPU_OPEN_ISAS, prev_isa,
 644                                  CGEN_CPU_OPEN_BFDMACH, mach_name,
 645                                  CGEN_CPU_OPEN_ENDIAN, prev_endian,
 646                                  CGEN_CPU_OPEN_END);
 647       if (!cd)
 648         abort ();
 649
 650       /* Save this away for future reference.  */
 651       cl = xmalloc (sizeof (struct cpu_desc_list));
 652       cl->cd = cd;
 653       cl->isa = isa;
 654       cl->mach = mach;
 655       cl->endian = endian;
 656       cl->next = cd_list;
 657       cd_list = cl;
 658
 659       m32r_cgen_init_dis (cd);
 660     }
 661
 662   /* We try to have as much common code as possible.
 663      But at this point some targets need to take over.  */
 664   /* ??? Some targets may need a hook elsewhere.  Try to avoid this,
 665      but if not possible try to move this hook elsewhere rather than
 666      have two hooks.  */
 667   length = CGEN_PRINT_INSN (cd, pc, info);
 668   if (length > 0)
 669     return length;
 670   if (length < 0)
 671     return -1;
 672
 673   (*info->fprintf_func) (info->stream, UNKNOWN_INSN_MSG);
 674   return cd->default_insn_bitsize / 8;
 675 }