opcodes/epiphany-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 "epiphany-desc.h"
  37 #include "epiphany-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
  63 #define CGEN_PRINT_INSN epiphany_print_insn
  64
  65 static int
  66 epiphany_print_insn (CGEN_CPU_DESC cd, bfd_vma pc, disassemble_info *info)
  67 {
  68   bfd_byte buf[CGEN_MAX_INSN_SIZE];
  69   int buflen;
  70   int status;
  71
  72   info->bytes_per_chunk = 2;
  73
  74   /* Attempt to read the base part of the insn.  */
  75   info->bytes_per_line = buflen = cd->base_insn_bitsize / 8;
  76   status = (*info->read_memory_func) (pc, buf, buflen, info);
  77
  78   /* Try again with the minimum part, if min < base.  */
  79   if (status != 0 && (cd->min_insn_bitsize < cd->base_insn_bitsize))
  80     {
  81       info->bytes_per_line = buflen = cd->min_insn_bitsize / 8;
  82       status = (*info->read_memory_func) (pc, buf, buflen, info);
  83     }
  84
  85   if (status != 0)
  86     {
  87       (*info->memory_error_func) (status, pc, info);
  88       return -1;
  89     }
  90
  91   return print_insn (cd, pc, info, buf, buflen);
  92 }
  93
  94
  95 static void
  96 print_postindex (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
  97                  void * dis_info,
  98                  long value,
  99                  unsigned int attrs ATTRIBUTE_UNUSED,
 100                  bfd_vma pc ATTRIBUTE_UNUSED,
 101                  int length ATTRIBUTE_UNUSED)
 102 {
 103   disassemble_info *info = (disassemble_info *) dis_info;
 104   (*info->fprintf_func) (info->stream, value ? "-" : "+");
 105 }
 106
 107 static void
 108 print_simm_not_reg (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 109                     void * dis_info,
 110                     long value,
 111                     unsigned int attrs ATTRIBUTE_UNUSED,
 112                     bfd_vma pc ATTRIBUTE_UNUSED,
 113                     int length ATTRIBUTE_UNUSED)
 114 {
 115   print_address (cd, dis_info, value, attrs, pc, length);
 116 }
 117
 118 static void
 119 print_uimm_not_reg (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 120                     void * dis_info,
 121                     unsigned long value,
 122                     unsigned int attrs ATTRIBUTE_UNUSED,
 123                     bfd_vma pc ATTRIBUTE_UNUSED,
 124                     int length ATTRIBUTE_UNUSED)
 125 {
 126   disassemble_info *info = (disassemble_info *)dis_info;
 127
 128   if (value & 0x800)
 129     (*info->fprintf_func) (info->stream, "-");
 130
 131   value &= 0x7ff;
 132   print_address (cd, dis_info, value, attrs, pc, length);
 133 }
 134
 135 \f
 136 /* -- */
 137
 138 void epiphany_cgen_print_operand
 139   (CGEN_CPU_DESC, int, PTR, CGEN_FIELDS *, void const *, bfd_vma, int);
 140
 141 /* Main entry point for printing operands.
 142    XINFO is a `void *' and not a `disassemble_info *' to not put a requirement
 143    of dis-asm.h on cgen.h.
 144
 145    This function is basically just a big switch statement.  Earlier versions
 146    used tables to look up the function to use, but
 147    - if the table contains both assembler and disassembler functions then
 148      the disassembler contains much of the assembler and vice-versa,
 149    - there's a lot of inlining possibilities as things grow,
 150    - using a switch statement avoids the function call overhead.
 151
 152    This function could be moved into `print_insn_normal', but keeping it
 153    separate makes clear the interface between `print_insn_normal' and each of
 154    the handlers.  */
 155
 156 void
 157 epiphany_cgen_print_operand (CGEN_CPU_DESC cd,
 158                            int opindex,
 159                            void * xinfo,
 160                            CGEN_FIELDS *fields,
 161                            void const *attrs ATTRIBUTE_UNUSED,
 162                            bfd_vma pc,
 163                            int length)
 164 {
 165   disassemble_info *info = (disassemble_info *) xinfo;
 166
 167   switch (opindex)
 168     {
 169     case EPIPHANY_OPERAND_DIRECTION :
 170       print_postindex (cd, info, fields->f_addsubx, 0, pc, length);
 171       break;
 172     case EPIPHANY_OPERAND_DISP11 :
 173       print_uimm_not_reg (cd, info, fields->f_disp11, 0|(1<<CGEN_OPERAND_VIRTUAL), pc, length);
 174       break;
 175     case EPIPHANY_OPERAND_DISP3 :
 176       print_normal (cd, info, fields->f_disp3, 0, pc, length);
 177       break;
 178     case EPIPHANY_OPERAND_DPMI :
 179       print_postindex (cd, info, fields->f_subd, 0, pc, length);
 180       break;
 181     case EPIPHANY_OPERAND_FRD :
 182       print_keyword (cd, info, & epiphany_cgen_opval_gr_names, fields->f_rd, 0);
 183       break;
 184     case EPIPHANY_OPERAND_FRD6 :
 185       print_keyword (cd, info, & epiphany_cgen_opval_gr_names, fields->f_rd6, 0|(1<<CGEN_OPERAND_VIRTUAL));
 186       break;
 187     case EPIPHANY_OPERAND_FRM :
 188       print_keyword (cd, info, & epiphany_cgen_opval_gr_names, fields->f_rm, 0);
 189       break;
 190     case EPIPHANY_OPERAND_FRM6 :
 191       print_keyword (cd, info, & epiphany_cgen_opval_gr_names, fields->f_rm6, 0|(1<<CGEN_OPERAND_VIRTUAL));
 192       break;
 193     case EPIPHANY_OPERAND_FRN :
 194       print_keyword (cd, info, & epiphany_cgen_opval_gr_names, fields->f_rn, 0);
 195       break;
 196     case EPIPHANY_OPERAND_FRN6 :
 197       print_keyword (cd, info, & epiphany_cgen_opval_gr_names, fields->f_rn6, 0|(1<<CGEN_OPERAND_VIRTUAL));
 198       break;
 199     case EPIPHANY_OPERAND_IMM16 :
 200       print_address (cd, info, fields->f_imm16, 0|(1<<CGEN_OPERAND_RELAX)|(1<<CGEN_OPERAND_VIRTUAL), pc, length);
 201       break;
 202     case EPIPHANY_OPERAND_IMM8 :
 203       print_address (cd, info, fields->f_imm8, 0|(1<<CGEN_OPERAND_RELAX), pc, length);
 204       break;
 205     case EPIPHANY_OPERAND_RD :
 206       print_keyword (cd, info, & epiphany_cgen_opval_gr_names, fields->f_rd, 0);
 207       break;
 208     case EPIPHANY_OPERAND_RD6 :
 209       print_keyword (cd, info, & epiphany_cgen_opval_gr_names, fields->f_rd6, 0|(1<<CGEN_OPERAND_VIRTUAL));
 210       break;
 211     case EPIPHANY_OPERAND_RM :
 212       print_keyword (cd, info, & epiphany_cgen_opval_gr_names, fields->f_rm, 0);
 213       break;
 214     case EPIPHANY_OPERAND_RM6 :
 215       print_keyword (cd, info, & epiphany_cgen_opval_gr_names, fields->f_rm6, 0|(1<<CGEN_OPERAND_VIRTUAL));
 216       break;
 217     case EPIPHANY_OPERAND_RN :
 218       print_keyword (cd, info, & epiphany_cgen_opval_gr_names, fields->f_rn, 0);
 219       break;
 220     case EPIPHANY_OPERAND_RN6 :
 221       print_keyword (cd, info, & epiphany_cgen_opval_gr_names, fields->f_rn6, 0|(1<<CGEN_OPERAND_VIRTUAL));
 222       break;
 223     case EPIPHANY_OPERAND_SD :
 224       print_keyword (cd, info, & epiphany_cgen_opval_cr_names, fields->f_sd, 0);
 225       break;
 226     case EPIPHANY_OPERAND_SD6 :
 227       print_keyword (cd, info, & epiphany_cgen_opval_cr_names, fields->f_sd6, 0|(1<<CGEN_OPERAND_VIRTUAL));
 228       break;
 229     case EPIPHANY_OPERAND_SDDMA :
 230       print_keyword (cd, info, & epiphany_cgen_opval_crdma_names, fields->f_sd6, 0|(1<<CGEN_OPERAND_VIRTUAL));
 231       break;
 232     case EPIPHANY_OPERAND_SDMEM :
 233       print_keyword (cd, info, & epiphany_cgen_opval_crmem_names, fields->f_sd6, 0|(1<<CGEN_OPERAND_VIRTUAL));
 234       break;
 235     case EPIPHANY_OPERAND_SDMESH :
 236       print_keyword (cd, info, & epiphany_cgen_opval_crmesh_names, fields->f_sd6, 0|(1<<CGEN_OPERAND_VIRTUAL));
 237       break;
 238     case EPIPHANY_OPERAND_SHIFT :
 239       print_normal (cd, info, fields->f_shift, 0, pc, length);
 240       break;
 241     case EPIPHANY_OPERAND_SIMM11 :
 242       print_simm_not_reg (cd, info, fields->f_sdisp11, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_RELAX)|(1<<CGEN_OPERAND_VIRTUAL), pc, length);
 243       break;
 244     case EPIPHANY_OPERAND_SIMM24 :
 245       print_address (cd, info, fields->f_simm24, 0|(1<<CGEN_OPERAND_RELAX)|(1<<CGEN_OPERAND_RELOC)|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
 246       break;
 247     case EPIPHANY_OPERAND_SIMM3 :
 248       print_simm_not_reg (cd, info, fields->f_sdisp3, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_RELAX), pc, length);
 249       break;
 250     case EPIPHANY_OPERAND_SIMM8 :
 251       print_address (cd, info, fields->f_simm8, 0|(1<<CGEN_OPERAND_RELAX)|(1<<CGEN_OPERAND_RELOC)|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
 252       break;
 253     case EPIPHANY_OPERAND_SN :
 254       print_keyword (cd, info, & epiphany_cgen_opval_cr_names, fields->f_sn, 0);
 255       break;
 256     case EPIPHANY_OPERAND_SN6 :
 257       print_keyword (cd, info, & epiphany_cgen_opval_cr_names, fields->f_sn6, 0|(1<<CGEN_OPERAND_VIRTUAL));
 258       break;
 259     case EPIPHANY_OPERAND_SNDMA :
 260       print_keyword (cd, info, & epiphany_cgen_opval_crdma_names, fields->f_sn6, 0|(1<<CGEN_OPERAND_VIRTUAL));
 261       break;
 262     case EPIPHANY_OPERAND_SNMEM :
 263       print_keyword (cd, info, & epiphany_cgen_opval_crmem_names, fields->f_sn6, 0|(1<<CGEN_OPERAND_VIRTUAL));
 264       break;
 265     case EPIPHANY_OPERAND_SNMESH :
 266       print_keyword (cd, info, & epiphany_cgen_opval_crmesh_names, fields->f_sn6, 0|(1<<CGEN_OPERAND_VIRTUAL));
 267       break;
 268     case EPIPHANY_OPERAND_SWI_NUM :
 269       print_uimm_not_reg (cd, info, fields->f_trap_num, 0, pc, length);
 270       break;
 271     case EPIPHANY_OPERAND_TRAPNUM6 :
 272       print_normal (cd, info, fields->f_trap_num, 0, pc, length);
 273       break;
 274
 275     default :
 276       /* xgettext:c-format */
 277       fprintf (stderr, _("Unrecognized field %d while printing insn.\n"),
 278                opindex);
 279     abort ();
 280   }
 281 }
 282
 283 cgen_print_fn * const epiphany_cgen_print_handlers[] =
 284 {
 285   print_insn_normal,
 286 };
 287
 288
 289 void
 290 epiphany_cgen_init_dis (CGEN_CPU_DESC cd)
 291 {
 292   epiphany_cgen_init_opcode_table (cd);
 293   epiphany_cgen_init_ibld_table (cd);
 294   cd->print_handlers = & epiphany_cgen_print_handlers[0];
 295   cd->print_operand = epiphany_cgen_print_operand;
 296 }
 297
 298 \f
 299 /* Default print handler.  */
 300
 301 static void
 302 print_normal (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 303               void *dis_info,
 304               long value,
 305               unsigned int attrs,
 306               bfd_vma pc ATTRIBUTE_UNUSED,
 307               int length ATTRIBUTE_UNUSED)
 308 {
 309   disassemble_info *info = (disassemble_info *) dis_info;
 310
 311   /* Print the operand as directed by the attributes.  */
 312   if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
 313     ; /* nothing to do */
 314   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
 315     (*info->fprintf_func) (info->stream, "%ld", value);
 316   else
 317     (*info->fprintf_func) (info->stream, "0x%lx", value);
 318 }
 319
 320 /* Default address handler.  */
 321
 322 static void
 323 print_address (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 324                void *dis_info,
 325                bfd_vma value,
 326                unsigned int attrs,
 327                bfd_vma pc ATTRIBUTE_UNUSED,
 328                int length ATTRIBUTE_UNUSED)
 329 {
 330   disassemble_info *info = (disassemble_info *) dis_info;
 331
 332   /* Print the operand as directed by the attributes.  */
 333   if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
 334     ; /* Nothing to do.  */
 335   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_PCREL_ADDR))
 336     (*info->print_address_func) (value, info);
 337   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_ABS_ADDR))
 338     (*info->print_address_func) (value, info);
 339   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
 340     (*info->fprintf_func) (info->stream, "%ld", (long) value);
 341   else
 342     (*info->fprintf_func) (info->stream, "0x%lx", (long) value);
 343 }
 344
 345 /* Keyword print handler.  */
 346
 347 static void
 348 print_keyword (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 349                void *dis_info,
 350                CGEN_KEYWORD *keyword_table,
 351                long value,
 352                unsigned int attrs ATTRIBUTE_UNUSED)
 353 {
 354   disassemble_info *info = (disassemble_info *) dis_info;
 355   const CGEN_KEYWORD_ENTRY *ke;
 356
 357   ke = cgen_keyword_lookup_value (keyword_table, value);
 358   if (ke != NULL)
 359     (*info->fprintf_func) (info->stream, "%s", ke->name);
 360   else
 361     (*info->fprintf_func) (info->stream, "???");
 362 }
 363 \f
 364 /* Default insn printer.
 365
 366    DIS_INFO is defined as `void *' so the disassembler needn't know anything
 367    about disassemble_info.  */
 368
 369 static void
 370 print_insn_normal (CGEN_CPU_DESC cd,
 371                    void *dis_info,
 372                    const CGEN_INSN *insn,
 373                    CGEN_FIELDS *fields,
 374                    bfd_vma pc,
 375                    int length)
 376 {
 377   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 378   disassemble_info *info = (disassemble_info *) dis_info;
 379   const CGEN_SYNTAX_CHAR_TYPE *syn;
 380
 381   CGEN_INIT_PRINT (cd);
 382
 383   for (syn = CGEN_SYNTAX_STRING (syntax); *syn; ++syn)
 384     {
 385       if (CGEN_SYNTAX_MNEMONIC_P (*syn))
 386         {
 387           (*info->fprintf_func) (info->stream, "%s", CGEN_INSN_MNEMONIC (insn));
 388           continue;
 389         }
 390       if (CGEN_SYNTAX_CHAR_P (*syn))
 391         {
 392           (*info->fprintf_func) (info->stream, "%c", CGEN_SYNTAX_CHAR (*syn));
 393           continue;
 394         }
 395
 396       /* We have an operand.  */
 397       epiphany_cgen_print_operand (cd, CGEN_SYNTAX_FIELD (*syn), info,
 398                                  fields, CGEN_INSN_ATTRS (insn), pc, length);
 399     }
 400 }
 401 \f
 402 /* Subroutine of print_insn. Reads an insn into the given buffers and updates
 403    the extract info.
 404    Returns 0 if all is well, non-zero otherwise.  */
 405
 406 static int
 407 read_insn (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 408            bfd_vma pc,
 409            disassemble_info *info,
 410            bfd_byte *buf,
 411            int buflen,
 412            CGEN_EXTRACT_INFO *ex_info,
 413            unsigned long *insn_value)
 414 {
 415   int status = (*info->read_memory_func) (pc, buf, buflen, info);
 416
 417   if (status != 0)
 418     {
 419       (*info->memory_error_func) (status, pc, info);
 420       return -1;
 421     }
 422
 423   ex_info->dis_info = info;
 424   ex_info->valid = (1 << buflen) - 1;
 425   ex_info->insn_bytes = buf;
 426
 427   *insn_value = bfd_get_bits (buf, buflen * 8, info->endian == BFD_ENDIAN_BIG);
 428   return 0;
 429 }
 430
 431 /* Utility to print an insn.
 432    BUF is the base part of the insn, target byte order, BUFLEN bytes long.
 433    The result is the size of the insn in bytes or zero for an unknown insn
 434    or -1 if an error occurs fetching data (memory_error_func will have
 435    been called).  */
 436
 437 static int
 438 print_insn (CGEN_CPU_DESC cd,
 439             bfd_vma pc,
 440             disassemble_info *info,
 441             bfd_byte *buf,
 442             unsigned int buflen)
 443 {
 444   CGEN_INSN_INT insn_value;
 445   const CGEN_INSN_LIST *insn_list;
 446   CGEN_EXTRACT_INFO ex_info;
 447   int basesize;
 448
 449   /* Extract base part of instruction, just in case CGEN_DIS_* uses it. */
 450   basesize = cd->base_insn_bitsize < buflen * 8 ?
 451                                      cd->base_insn_bitsize : buflen * 8;
 452   insn_value = cgen_get_insn_value (cd, buf, basesize);
 453
 454
 455   /* Fill in ex_info fields like read_insn would.  Don't actually call
 456      read_insn, since the incoming buffer is already read (and possibly
 457      modified a la m32r).  */
 458   ex_info.valid = (1 << buflen) - 1;
 459   ex_info.dis_info = info;
 460   ex_info.insn_bytes = buf;
 461
 462   /* The instructions are stored in hash lists.
 463      Pick the first one and keep trying until we find the right one.  */
 464
 465   insn_list = CGEN_DIS_LOOKUP_INSN (cd, (char *) buf, insn_value);
 466   while (insn_list != NULL)
 467     {
 468       const CGEN_INSN *insn = insn_list->insn;
 469       CGEN_FIELDS fields;
 470       int length;
 471       unsigned long insn_value_cropped;
 472
 473 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 474       /* Not needed as insn shouldn't be in hash lists if not supported.  */
 475       /* Supported by this cpu?  */
 476       if (! epiphany_cgen_insn_supported (cd, insn))
 477         {
 478           insn_list = CGEN_DIS_NEXT_INSN (insn_list);
 479           continue;
 480         }
 481 #endif
 482
 483       /* Basic bit mask must be correct.  */
 484       /* ??? May wish to allow target to defer this check until the extract
 485          handler.  */
 486
 487       /* Base size may exceed this instruction's size.  Extract the
 488          relevant part from the buffer. */
 489       if ((unsigned) (CGEN_INSN_BITSIZE (insn) / 8) < buflen &&
 490           (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
 491         insn_value_cropped = bfd_get_bits (buf, CGEN_INSN_BITSIZE (insn),
 492                                            info->endian == BFD_ENDIAN_BIG);
 493       else
 494         insn_value_cropped = insn_value;
 495
 496       if ((insn_value_cropped & CGEN_INSN_BASE_MASK (insn))
 497           == CGEN_INSN_BASE_VALUE (insn))
 498         {
 499           /* Printing is handled in two passes.  The first pass parses the
 500              machine insn and extracts the fields.  The second pass prints
 501              them.  */
 502
 503           /* Make sure the entire insn is loaded into insn_value, if it
 504              can fit.  */
 505           if (((unsigned) CGEN_INSN_BITSIZE (insn) > cd->base_insn_bitsize) &&
 506               (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
 507             {
 508               unsigned long full_insn_value;
 509               int rc = read_insn (cd, pc, info, buf,
 510                                   CGEN_INSN_BITSIZE (insn) / 8,
 511                                   & ex_info, & full_insn_value);
 512               if (rc != 0)
 513                 return rc;
 514               length = CGEN_EXTRACT_FN (cd, insn)
 515                 (cd, insn, &ex_info, full_insn_value, &fields, pc);
 516             }
 517           else
 518             length = CGEN_EXTRACT_FN (cd, insn)
 519               (cd, insn, &ex_info, insn_value_cropped, &fields, pc);
 520
 521           /* Length < 0 -> error.  */
 522           if (length < 0)
 523             return length;
 524           if (length > 0)
 525             {
 526               CGEN_PRINT_FN (cd, insn) (cd, info, insn, &fields, pc, length);
 527               /* Length is in bits, result is in bytes.  */
 528               return length / 8;
 529             }
 530         }
 531
 532       insn_list = CGEN_DIS_NEXT_INSN (insn_list);
 533     }
 534
 535   return 0;
 536 }
 537
 538 /* Default value for CGEN_PRINT_INSN.
 539    The result is the size of the insn in bytes or zero for an unknown insn
 540    or -1 if an error occured fetching bytes.  */
 541
 542 #ifndef CGEN_PRINT_INSN
 543 #define CGEN_PRINT_INSN default_print_insn
 544 #endif
 545
 546 static int
 547 default_print_insn (CGEN_CPU_DESC cd, bfd_vma pc, disassemble_info *info)
 548 {
 549   bfd_byte buf[CGEN_MAX_INSN_SIZE];
 550   int buflen;
 551   int status;
 552
 553   /* Attempt to read the base part of the insn.  */
 554   buflen = cd->base_insn_bitsize / 8;
 555   status = (*info->read_memory_func) (pc, buf, buflen, info);
 556
 557   /* Try again with the minimum part, if min < base.  */
 558   if (status != 0 && (cd->min_insn_bitsize < cd->base_insn_bitsize))
 559     {
 560       buflen = cd->min_insn_bitsize / 8;
 561       status = (*info->read_memory_func) (pc, buf, buflen, info);
 562     }
 563
 564   if (status != 0)
 565     {
 566       (*info->memory_error_func) (status, pc, info);
 567       return -1;
 568     }
 569
 570   return print_insn (cd, pc, info, buf, buflen);
 571 }
 572
 573 /* Main entry point.
 574    Print one instruction from PC on INFO->STREAM.
 575    Return the size of the instruction (in bytes).  */
 576
 577 typedef struct cpu_desc_list
 578 {
 579   struct cpu_desc_list *next;
 580   CGEN_BITSET *isa;
 581   int mach;
 582   int endian;
 583   CGEN_CPU_DESC cd;
 584 } cpu_desc_list;
 585
 586 int
 587 print_insn_epiphany (bfd_vma pc, disassemble_info *info)
 588 {
 589   static cpu_desc_list *cd_list = 0;
 590   cpu_desc_list *cl = 0;
 591   static CGEN_CPU_DESC cd = 0;
 592   static CGEN_BITSET *prev_isa;
 593   static int prev_mach;
 594   static int prev_endian;
 595   int length;
 596   CGEN_BITSET *isa;
 597   int mach;
 598   int endian = (info->endian == BFD_ENDIAN_BIG
 599                 ? CGEN_ENDIAN_BIG
 600                 : CGEN_ENDIAN_LITTLE);
 601   enum bfd_architecture arch;
 602
 603   /* ??? gdb will set mach but leave the architecture as "unknown" */
 604 #ifndef CGEN_BFD_ARCH
 605 #define CGEN_BFD_ARCH bfd_arch_epiphany
 606 #endif
 607   arch = info->arch;
 608   if (arch == bfd_arch_unknown)
 609     arch = CGEN_BFD_ARCH;
 610
 611   /* There's no standard way to compute the machine or isa number
 612      so we leave it to the target.  */
 613 #ifdef CGEN_COMPUTE_MACH
 614   mach = CGEN_COMPUTE_MACH (info);
 615 #else
 616   mach = info->mach;
 617 #endif
 618
 619 #ifdef CGEN_COMPUTE_ISA
 620   {
 621     static CGEN_BITSET *permanent_isa;
 622
 623     if (!permanent_isa)
 624       permanent_isa = cgen_bitset_create (MAX_ISAS);
 625     isa = permanent_isa;
 626     cgen_bitset_clear (isa);
 627     cgen_bitset_add (isa, CGEN_COMPUTE_ISA (info));
 628   }
 629 #else
 630   isa = info->insn_sets;
 631 #endif
 632
 633   /* If we've switched cpu's, try to find a handle we've used before */
 634   if (cd
 635       && (cgen_bitset_compare (isa, prev_isa) != 0
 636           || mach != prev_mach
 637           || endian != prev_endian))
 638     {
 639       cd = 0;
 640       for (cl = cd_list; cl; cl = cl->next)
 641         {
 642           if (cgen_bitset_compare (cl->isa, isa) == 0 &&
 643               cl->mach == mach &&
 644               cl->endian == endian)
 645             {
 646               cd = cl->cd;
 647               prev_isa = cd->isas;
 648               break;
 649             }
 650         }
 651     }
 652
 653   /* If we haven't initialized yet, initialize the opcode table.  */
 654   if (! cd)
 655     {
 656       const bfd_arch_info_type *arch_type = bfd_lookup_arch (arch, mach);
 657       const char *mach_name;
 658
 659       if (!arch_type)
 660         abort ();
 661       mach_name = arch_type->printable_name;
 662
 663       prev_isa = cgen_bitset_copy (isa);
 664       prev_mach = mach;
 665       prev_endian = endian;
 666       cd = epiphany_cgen_cpu_open (CGEN_CPU_OPEN_ISAS, prev_isa,
 667                                  CGEN_CPU_OPEN_BFDMACH, mach_name,
 668                                  CGEN_CPU_OPEN_ENDIAN, prev_endian,
 669                                  CGEN_CPU_OPEN_END);
 670       if (!cd)
 671         abort ();
 672
 673       /* Save this away for future reference.  */
 674       cl = xmalloc (sizeof (struct cpu_desc_list));
 675       cl->cd = cd;
 676       cl->isa = prev_isa;
 677       cl->mach = mach;
 678       cl->endian = endian;
 679       cl->next = cd_list;
 680       cd_list = cl;
 681
 682       epiphany_cgen_init_dis (cd);
 683     }
 684
 685   /* We try to have as much common code as possible.
 686      But at this point some targets need to take over.  */
 687   /* ??? Some targets may need a hook elsewhere.  Try to avoid this,
 688      but if not possible try to move this hook elsewhere rather than
 689      have two hooks.  */
 690   length = CGEN_PRINT_INSN (cd, pc, info);
 691   if (length > 0)
 692     return length;
 693   if (length < 0)
 694     return -1;
 695
 696   (*info->fprintf_func) (info->stream, UNKNOWN_INSN_MSG);
 697   return cd->default_insn_bitsize / 8;
 698 }