opcodes/xstormy16-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) 1996-2018 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 "xstormy16-desc.h"
  37 #include "xstormy16-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 xstormy16_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 xstormy16_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 XSTORMY16_OPERAND_RB :
  94       print_keyword (cd, info, & xstormy16_cgen_opval_gr_Rb_names, fields->f_Rb, 0);
  95       break;
  96     case XSTORMY16_OPERAND_RBJ :
  97       print_keyword (cd, info, & xstormy16_cgen_opval_gr_Rb_names, fields->f_Rbj, 0);
  98       break;
  99     case XSTORMY16_OPERAND_RD :
 100       print_keyword (cd, info, & xstormy16_cgen_opval_gr_names, fields->f_Rd, 0);
 101       break;
 102     case XSTORMY16_OPERAND_RDM :
 103       print_keyword (cd, info, & xstormy16_cgen_opval_gr_names, fields->f_Rdm, 0);
 104       break;
 105     case XSTORMY16_OPERAND_RM :
 106       print_keyword (cd, info, & xstormy16_cgen_opval_gr_names, fields->f_Rm, 0);
 107       break;
 108     case XSTORMY16_OPERAND_RS :
 109       print_keyword (cd, info, & xstormy16_cgen_opval_gr_names, fields->f_Rs, 0);
 110       break;
 111     case XSTORMY16_OPERAND_ABS24 :
 112       print_normal (cd, info, fields->f_abs24, 0|(1<<CGEN_OPERAND_ABS_ADDR)|(1<<CGEN_OPERAND_VIRTUAL), pc, length);
 113       break;
 114     case XSTORMY16_OPERAND_BCOND2 :
 115       print_keyword (cd, info, & xstormy16_cgen_opval_h_branchcond, fields->f_op2, 0);
 116       break;
 117     case XSTORMY16_OPERAND_BCOND5 :
 118       print_keyword (cd, info, & xstormy16_cgen_opval_h_branchcond, fields->f_op5, 0);
 119       break;
 120     case XSTORMY16_OPERAND_HMEM8 :
 121       print_normal (cd, info, fields->f_hmem8, 0|(1<<CGEN_OPERAND_ABS_ADDR), pc, length);
 122       break;
 123     case XSTORMY16_OPERAND_IMM12 :
 124       print_normal (cd, info, fields->f_imm12, 0|(1<<CGEN_OPERAND_SIGNED), pc, length);
 125       break;
 126     case XSTORMY16_OPERAND_IMM16 :
 127       print_normal (cd, info, fields->f_imm16, 0|(1<<CGEN_OPERAND_SIGN_OPT), pc, length);
 128       break;
 129     case XSTORMY16_OPERAND_IMM2 :
 130       print_normal (cd, info, fields->f_imm2, 0, pc, length);
 131       break;
 132     case XSTORMY16_OPERAND_IMM3 :
 133       print_normal (cd, info, fields->f_imm3, 0, pc, length);
 134       break;
 135     case XSTORMY16_OPERAND_IMM3B :
 136       print_normal (cd, info, fields->f_imm3b, 0, pc, length);
 137       break;
 138     case XSTORMY16_OPERAND_IMM4 :
 139       print_normal (cd, info, fields->f_imm4, 0, pc, length);
 140       break;
 141     case XSTORMY16_OPERAND_IMM8 :
 142       print_normal (cd, info, fields->f_imm8, 0, pc, length);
 143       break;
 144     case XSTORMY16_OPERAND_IMM8SMALL :
 145       print_normal (cd, info, fields->f_imm8, 0, pc, length);
 146       break;
 147     case XSTORMY16_OPERAND_LMEM8 :
 148       print_normal (cd, info, fields->f_lmem8, 0|(1<<CGEN_OPERAND_ABS_ADDR), pc, length);
 149       break;
 150     case XSTORMY16_OPERAND_REL12 :
 151       print_normal (cd, info, fields->f_rel12, 0|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
 152       break;
 153     case XSTORMY16_OPERAND_REL12A :
 154       print_normal (cd, info, fields->f_rel12a, 0|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
 155       break;
 156     case XSTORMY16_OPERAND_REL8_2 :
 157       print_normal (cd, info, fields->f_rel8_2, 0|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
 158       break;
 159     case XSTORMY16_OPERAND_REL8_4 :
 160       print_normal (cd, info, fields->f_rel8_4, 0|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
 161       break;
 162     case XSTORMY16_OPERAND_WS2 :
 163       print_keyword (cd, info, & xstormy16_cgen_opval_h_wordsize, fields->f_op2m, 0);
 164       break;
 165
 166     default :
 167       /* xgettext:c-format */
 168       opcodes_error_handler
 169         (_("internal error: unrecognized field %d while printing insn"),
 170          opindex);
 171       abort ();
 172   }
 173 }
 174
 175 cgen_print_fn * const xstormy16_cgen_print_handlers[] =
 176 {
 177   print_insn_normal,
 178 };
 179
 180
 181 void
 182 xstormy16_cgen_init_dis (CGEN_CPU_DESC cd)
 183 {
 184   xstormy16_cgen_init_opcode_table (cd);
 185   xstormy16_cgen_init_ibld_table (cd);
 186   cd->print_handlers = & xstormy16_cgen_print_handlers[0];
 187   cd->print_operand = xstormy16_cgen_print_operand;
 188 }
 189
 190 \f
 191 /* Default print handler.  */
 192
 193 static void
 194 print_normal (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 195               void *dis_info,
 196               long value,
 197               unsigned int attrs,
 198               bfd_vma pc ATTRIBUTE_UNUSED,
 199               int length ATTRIBUTE_UNUSED)
 200 {
 201   disassemble_info *info = (disassemble_info *) dis_info;
 202
 203   /* Print the operand as directed by the attributes.  */
 204   if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
 205     ; /* nothing to do */
 206   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
 207     (*info->fprintf_func) (info->stream, "%ld", value);
 208   else
 209     (*info->fprintf_func) (info->stream, "0x%lx", value);
 210 }
 211
 212 /* Default address handler.  */
 213
 214 static void
 215 print_address (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 216                void *dis_info,
 217                bfd_vma value,
 218                unsigned int attrs,
 219                bfd_vma pc ATTRIBUTE_UNUSED,
 220                int length ATTRIBUTE_UNUSED)
 221 {
 222   disassemble_info *info = (disassemble_info *) dis_info;
 223
 224   /* Print the operand as directed by the attributes.  */
 225   if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
 226     ; /* Nothing to do.  */
 227   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_PCREL_ADDR))
 228     (*info->print_address_func) (value, info);
 229   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_ABS_ADDR))
 230     (*info->print_address_func) (value, info);
 231   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
 232     (*info->fprintf_func) (info->stream, "%ld", (long) value);
 233   else
 234     (*info->fprintf_func) (info->stream, "0x%lx", (long) value);
 235 }
 236
 237 /* Keyword print handler.  */
 238
 239 static void
 240 print_keyword (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 241                void *dis_info,
 242                CGEN_KEYWORD *keyword_table,
 243                long value,
 244                unsigned int attrs ATTRIBUTE_UNUSED)
 245 {
 246   disassemble_info *info = (disassemble_info *) dis_info;
 247   const CGEN_KEYWORD_ENTRY *ke;
 248
 249   ke = cgen_keyword_lookup_value (keyword_table, value);
 250   if (ke != NULL)
 251     (*info->fprintf_func) (info->stream, "%s", ke->name);
 252   else
 253     (*info->fprintf_func) (info->stream, "???");
 254 }
 255 \f
 256 /* Default insn printer.
 257
 258    DIS_INFO is defined as `void *' so the disassembler needn't know anything
 259    about disassemble_info.  */
 260
 261 static void
 262 print_insn_normal (CGEN_CPU_DESC cd,
 263                    void *dis_info,
 264                    const CGEN_INSN *insn,
 265                    CGEN_FIELDS *fields,
 266                    bfd_vma pc,
 267                    int length)
 268 {
 269   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 270   disassemble_info *info = (disassemble_info *) dis_info;
 271   const CGEN_SYNTAX_CHAR_TYPE *syn;
 272
 273   CGEN_INIT_PRINT (cd);
 274
 275   for (syn = CGEN_SYNTAX_STRING (syntax); *syn; ++syn)
 276     {
 277       if (CGEN_SYNTAX_MNEMONIC_P (*syn))
 278         {
 279           (*info->fprintf_func) (info->stream, "%s", CGEN_INSN_MNEMONIC (insn));
 280           continue;
 281         }
 282       if (CGEN_SYNTAX_CHAR_P (*syn))
 283         {
 284           (*info->fprintf_func) (info->stream, "%c", CGEN_SYNTAX_CHAR (*syn));
 285           continue;
 286         }
 287
 288       /* We have an operand.  */
 289       xstormy16_cgen_print_operand (cd, CGEN_SYNTAX_FIELD (*syn), info,
 290                                  fields, CGEN_INSN_ATTRS (insn), pc, length);
 291     }
 292 }
 293 \f
 294 /* Subroutine of print_insn. Reads an insn into the given buffers and updates
 295    the extract info.
 296    Returns 0 if all is well, non-zero otherwise.  */
 297
 298 static int
 299 read_insn (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 300            bfd_vma pc,
 301            disassemble_info *info,
 302            bfd_byte *buf,
 303            int buflen,
 304            CGEN_EXTRACT_INFO *ex_info,
 305            unsigned long *insn_value)
 306 {
 307   int status = (*info->read_memory_func) (pc, buf, buflen, info);
 308
 309   if (status != 0)
 310     {
 311       (*info->memory_error_func) (status, pc, info);
 312       return -1;
 313     }
 314
 315   ex_info->dis_info = info;
 316   ex_info->valid = (1 << buflen) - 1;
 317   ex_info->insn_bytes = buf;
 318
 319   *insn_value = bfd_get_bits (buf, buflen * 8, info->endian == BFD_ENDIAN_BIG);
 320   return 0;
 321 }
 322
 323 /* Utility to print an insn.
 324    BUF is the base part of the insn, target byte order, BUFLEN bytes long.
 325    The result is the size of the insn in bytes or zero for an unknown insn
 326    or -1 if an error occurs fetching data (memory_error_func will have
 327    been called).  */
 328
 329 static int
 330 print_insn (CGEN_CPU_DESC cd,
 331             bfd_vma pc,
 332             disassemble_info *info,
 333             bfd_byte *buf,
 334             unsigned int buflen)
 335 {
 336   CGEN_INSN_INT insn_value;
 337   const CGEN_INSN_LIST *insn_list;
 338   CGEN_EXTRACT_INFO ex_info;
 339   int basesize;
 340
 341   /* Extract base part of instruction, just in case CGEN_DIS_* uses it. */
 342   basesize = cd->base_insn_bitsize < buflen * 8 ?
 343                                      cd->base_insn_bitsize : buflen * 8;
 344   insn_value = cgen_get_insn_value (cd, buf, basesize);
 345
 346
 347   /* Fill in ex_info fields like read_insn would.  Don't actually call
 348      read_insn, since the incoming buffer is already read (and possibly
 349      modified a la m32r).  */
 350   ex_info.valid = (1 << buflen) - 1;
 351   ex_info.dis_info = info;
 352   ex_info.insn_bytes = buf;
 353
 354   /* The instructions are stored in hash lists.
 355      Pick the first one and keep trying until we find the right one.  */
 356
 357   insn_list = CGEN_DIS_LOOKUP_INSN (cd, (char *) buf, insn_value);
 358   while (insn_list != NULL)
 359     {
 360       const CGEN_INSN *insn = insn_list->insn;
 361       CGEN_FIELDS fields;
 362       int length;
 363       unsigned long insn_value_cropped;
 364
 365 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 366       /* Not needed as insn shouldn't be in hash lists if not supported.  */
 367       /* Supported by this cpu?  */
 368       if (! xstormy16_cgen_insn_supported (cd, insn))
 369         {
 370           insn_list = CGEN_DIS_NEXT_INSN (insn_list);
 371           continue;
 372         }
 373 #endif
 374
 375       /* Basic bit mask must be correct.  */
 376       /* ??? May wish to allow target to defer this check until the extract
 377          handler.  */
 378
 379       /* Base size may exceed this instruction's size.  Extract the
 380          relevant part from the buffer. */
 381       if ((unsigned) (CGEN_INSN_BITSIZE (insn) / 8) < buflen &&
 382           (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
 383         insn_value_cropped = bfd_get_bits (buf, CGEN_INSN_BITSIZE (insn),
 384                                            info->endian == BFD_ENDIAN_BIG);
 385       else
 386         insn_value_cropped = insn_value;
 387
 388       if ((insn_value_cropped & CGEN_INSN_BASE_MASK (insn))
 389           == CGEN_INSN_BASE_VALUE (insn))
 390         {
 391           /* Printing is handled in two passes.  The first pass parses the
 392              machine insn and extracts the fields.  The second pass prints
 393              them.  */
 394
 395           /* Make sure the entire insn is loaded into insn_value, if it
 396              can fit.  */
 397           if (((unsigned) CGEN_INSN_BITSIZE (insn) > cd->base_insn_bitsize) &&
 398               (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
 399             {
 400               unsigned long full_insn_value;
 401               int rc = read_insn (cd, pc, info, buf,
 402                                   CGEN_INSN_BITSIZE (insn) / 8,
 403                                   & ex_info, & full_insn_value);
 404               if (rc != 0)
 405                 return rc;
 406               length = CGEN_EXTRACT_FN (cd, insn)
 407                 (cd, insn, &ex_info, full_insn_value, &fields, pc);
 408             }
 409           else
 410             length = CGEN_EXTRACT_FN (cd, insn)
 411               (cd, insn, &ex_info, insn_value_cropped, &fields, pc);
 412
 413           /* Length < 0 -> error.  */
 414           if (length < 0)
 415             return length;
 416           if (length > 0)
 417             {
 418               CGEN_PRINT_FN (cd, insn) (cd, info, insn, &fields, pc, length);
 419               /* Length is in bits, result is in bytes.  */
 420               return length / 8;
 421             }
 422         }
 423
 424       insn_list = CGEN_DIS_NEXT_INSN (insn_list);
 425     }
 426
 427   return 0;
 428 }
 429
 430 /* Default value for CGEN_PRINT_INSN.
 431    The result is the size of the insn in bytes or zero for an unknown insn
 432    or -1 if an error occured fetching bytes.  */
 433
 434 #ifndef CGEN_PRINT_INSN
 435 #define CGEN_PRINT_INSN default_print_insn
 436 #endif
 437
 438 static int
 439 default_print_insn (CGEN_CPU_DESC cd, bfd_vma pc, disassemble_info *info)
 440 {
 441   bfd_byte buf[CGEN_MAX_INSN_SIZE];
 442   int buflen;
 443   int status;
 444
 445   /* Attempt to read the base part of the insn.  */
 446   buflen = cd->base_insn_bitsize / 8;
 447   status = (*info->read_memory_func) (pc, buf, buflen, info);
 448
 449   /* Try again with the minimum part, if min < base.  */
 450   if (status != 0 && (cd->min_insn_bitsize < cd->base_insn_bitsize))
 451     {
 452       buflen = cd->min_insn_bitsize / 8;
 453       status = (*info->read_memory_func) (pc, buf, buflen, info);
 454     }
 455
 456   if (status != 0)
 457     {
 458       (*info->memory_error_func) (status, pc, info);
 459       return -1;
 460     }
 461
 462   return print_insn (cd, pc, info, buf, buflen);
 463 }
 464
 465 /* Main entry point.
 466    Print one instruction from PC on INFO->STREAM.
 467    Return the size of the instruction (in bytes).  */
 468
 469 typedef struct cpu_desc_list
 470 {
 471   struct cpu_desc_list *next;
 472   CGEN_BITSET *isa;
 473   int mach;
 474   int endian;
 475   CGEN_CPU_DESC cd;
 476 } cpu_desc_list;
 477
 478 int
 479 print_insn_xstormy16 (bfd_vma pc, disassemble_info *info)
 480 {
 481   static cpu_desc_list *cd_list = 0;
 482   cpu_desc_list *cl = 0;
 483   static CGEN_CPU_DESC cd = 0;
 484   static CGEN_BITSET *prev_isa;
 485   static int prev_mach;
 486   static int prev_endian;
 487   int length;
 488   CGEN_BITSET *isa;
 489   int mach;
 490   int endian = (info->endian == BFD_ENDIAN_BIG
 491                 ? CGEN_ENDIAN_BIG
 492                 : CGEN_ENDIAN_LITTLE);
 493   enum bfd_architecture arch;
 494
 495   /* ??? gdb will set mach but leave the architecture as "unknown" */
 496 #ifndef CGEN_BFD_ARCH
 497 #define CGEN_BFD_ARCH bfd_arch_xstormy16
 498 #endif
 499   arch = info->arch;
 500   if (arch == bfd_arch_unknown)
 501     arch = CGEN_BFD_ARCH;
 502
 503   /* There's no standard way to compute the machine or isa number
 504      so we leave it to the target.  */
 505 #ifdef CGEN_COMPUTE_MACH
 506   mach = CGEN_COMPUTE_MACH (info);
 507 #else
 508   mach = info->mach;
 509 #endif
 510
 511 #ifdef CGEN_COMPUTE_ISA
 512   {
 513     static CGEN_BITSET *permanent_isa;
 514
 515     if (!permanent_isa)
 516       permanent_isa = cgen_bitset_create (MAX_ISAS);
 517     isa = permanent_isa;
 518     cgen_bitset_clear (isa);
 519     cgen_bitset_add (isa, CGEN_COMPUTE_ISA (info));
 520   }
 521 #else
 522   isa = info->insn_sets;
 523 #endif
 524
 525   /* If we've switched cpu's, try to find a handle we've used before */
 526   if (cd
 527       && (cgen_bitset_compare (isa, prev_isa) != 0
 528           || mach != prev_mach
 529           || endian != prev_endian))
 530     {
 531       cd = 0;
 532       for (cl = cd_list; cl; cl = cl->next)
 533         {
 534           if (cgen_bitset_compare (cl->isa, isa) == 0 &&
 535               cl->mach == mach &&
 536               cl->endian == endian)
 537             {
 538               cd = cl->cd;
 539               prev_isa = cd->isas;
 540               break;
 541             }
 542         }
 543     }
 544
 545   /* If we haven't initialized yet, initialize the opcode table.  */
 546   if (! cd)
 547     {
 548       const bfd_arch_info_type *arch_type = bfd_lookup_arch (arch, mach);
 549       const char *mach_name;
 550
 551       if (!arch_type)
 552         abort ();
 553       mach_name = arch_type->printable_name;
 554
 555       prev_isa = cgen_bitset_copy (isa);
 556       prev_mach = mach;
 557       prev_endian = endian;
 558       cd = xstormy16_cgen_cpu_open (CGEN_CPU_OPEN_ISAS, prev_isa,
 559                                  CGEN_CPU_OPEN_BFDMACH, mach_name,
 560                                  CGEN_CPU_OPEN_ENDIAN, prev_endian,
 561                                  CGEN_CPU_OPEN_END);
 562       if (!cd)
 563         abort ();
 564
 565       /* Save this away for future reference.  */
 566       cl = xmalloc (sizeof (struct cpu_desc_list));
 567       cl->cd = cd;
 568       cl->isa = prev_isa;
 569       cl->mach = mach;
 570       cl->endian = endian;
 571       cl->next = cd_list;
 572       cd_list = cl;
 573
 574       xstormy16_cgen_init_dis (cd);
 575     }
 576
 577   /* We try to have as much common code as possible.
 578      But at this point some targets need to take over.  */
 579   /* ??? Some targets may need a hook elsewhere.  Try to avoid this,
 580      but if not possible try to move this hook elsewhere rather than
 581      have two hooks.  */
 582   length = CGEN_PRINT_INSN (cd, pc, info);
 583   if (length > 0)
 584     return length;
 585   if (length < 0)
 586     return -1;
 587
 588   (*info->fprintf_func) (info->stream, UNKNOWN_INSN_MSG);
 589   return cd->default_insn_bitsize / 8;
 590 }