opcodes/or1k-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 "or1k-desc.h"
  37 #include "or1k-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 or1k_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 or1k_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 OR1K_OPERAND_DISP26 :
  94       print_address (cd, info, fields->f_disp26, 0|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
  95       break;
  96     case OR1K_OPERAND_RA :
  97       print_keyword (cd, info, & or1k_cgen_opval_h_gpr, fields->f_r2, 0);
  98       break;
  99     case OR1K_OPERAND_RADF :
 100       print_keyword (cd, info, & or1k_cgen_opval_h_fdr, fields->f_r1, 0);
 101       break;
 102     case OR1K_OPERAND_RASF :
 103       print_keyword (cd, info, & or1k_cgen_opval_h_fsr, fields->f_r2, 0);
 104       break;
 105     case OR1K_OPERAND_RB :
 106       print_keyword (cd, info, & or1k_cgen_opval_h_gpr, fields->f_r3, 0);
 107       break;
 108     case OR1K_OPERAND_RBDF :
 109       print_keyword (cd, info, & or1k_cgen_opval_h_fdr, fields->f_r1, 0);
 110       break;
 111     case OR1K_OPERAND_RBSF :
 112       print_keyword (cd, info, & or1k_cgen_opval_h_fsr, fields->f_r3, 0);
 113       break;
 114     case OR1K_OPERAND_RD :
 115       print_keyword (cd, info, & or1k_cgen_opval_h_gpr, fields->f_r1, 0);
 116       break;
 117     case OR1K_OPERAND_RDDF :
 118       print_keyword (cd, info, & or1k_cgen_opval_h_fdr, fields->f_r1, 0);
 119       break;
 120     case OR1K_OPERAND_RDSF :
 121       print_keyword (cd, info, & or1k_cgen_opval_h_fsr, fields->f_r1, 0);
 122       break;
 123     case OR1K_OPERAND_SIMM16 :
 124       print_normal (cd, info, fields->f_simm16, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_SIGN_OPT), pc, length);
 125       break;
 126     case OR1K_OPERAND_SIMM16_SPLIT :
 127       print_normal (cd, info, fields->f_simm16_split, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_SIGN_OPT)|(1<<CGEN_OPERAND_VIRTUAL), pc, length);
 128       break;
 129     case OR1K_OPERAND_UIMM16 :
 130       print_normal (cd, info, fields->f_uimm16, 0, pc, length);
 131       break;
 132     case OR1K_OPERAND_UIMM16_SPLIT :
 133       print_normal (cd, info, fields->f_uimm16_split, 0|(1<<CGEN_OPERAND_VIRTUAL), pc, length);
 134       break;
 135     case OR1K_OPERAND_UIMM6 :
 136       print_normal (cd, info, fields->f_uimm6, 0, pc, length);
 137       break;
 138
 139     default :
 140       /* xgettext:c-format */
 141       fprintf (stderr, _("Unrecognized field %d while printing insn.\n"),
 142                opindex);
 143     abort ();
 144   }
 145 }
 146
 147 cgen_print_fn * const or1k_cgen_print_handlers[] =
 148 {
 149   print_insn_normal,
 150 };
 151
 152
 153 void
 154 or1k_cgen_init_dis (CGEN_CPU_DESC cd)
 155 {
 156   or1k_cgen_init_opcode_table (cd);
 157   or1k_cgen_init_ibld_table (cd);
 158   cd->print_handlers = & or1k_cgen_print_handlers[0];
 159   cd->print_operand = or1k_cgen_print_operand;
 160 }
 161
 162 \f
 163 /* Default print handler.  */
 164
 165 static void
 166 print_normal (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 167               void *dis_info,
 168               long value,
 169               unsigned int attrs,
 170               bfd_vma pc ATTRIBUTE_UNUSED,
 171               int length ATTRIBUTE_UNUSED)
 172 {
 173   disassemble_info *info = (disassemble_info *) dis_info;
 174
 175   /* Print the operand as directed by the attributes.  */
 176   if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
 177     ; /* nothing to do */
 178   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
 179     (*info->fprintf_func) (info->stream, "%ld", value);
 180   else
 181     (*info->fprintf_func) (info->stream, "0x%lx", value);
 182 }
 183
 184 /* Default address handler.  */
 185
 186 static void
 187 print_address (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 188                void *dis_info,
 189                bfd_vma value,
 190                unsigned int attrs,
 191                bfd_vma pc ATTRIBUTE_UNUSED,
 192                int length ATTRIBUTE_UNUSED)
 193 {
 194   disassemble_info *info = (disassemble_info *) dis_info;
 195
 196   /* Print the operand as directed by the attributes.  */
 197   if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
 198     ; /* Nothing to do.  */
 199   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_PCREL_ADDR))
 200     (*info->print_address_func) (value, info);
 201   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_ABS_ADDR))
 202     (*info->print_address_func) (value, info);
 203   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
 204     (*info->fprintf_func) (info->stream, "%ld", (long) value);
 205   else
 206     (*info->fprintf_func) (info->stream, "0x%lx", (long) value);
 207 }
 208
 209 /* Keyword print handler.  */
 210
 211 static void
 212 print_keyword (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 213                void *dis_info,
 214                CGEN_KEYWORD *keyword_table,
 215                long value,
 216                unsigned int attrs ATTRIBUTE_UNUSED)
 217 {
 218   disassemble_info *info = (disassemble_info *) dis_info;
 219   const CGEN_KEYWORD_ENTRY *ke;
 220
 221   ke = cgen_keyword_lookup_value (keyword_table, value);
 222   if (ke != NULL)
 223     (*info->fprintf_func) (info->stream, "%s", ke->name);
 224   else
 225     (*info->fprintf_func) (info->stream, "???");
 226 }
 227 \f
 228 /* Default insn printer.
 229
 230    DIS_INFO is defined as `void *' so the disassembler needn't know anything
 231    about disassemble_info.  */
 232
 233 static void
 234 print_insn_normal (CGEN_CPU_DESC cd,
 235                    void *dis_info,
 236                    const CGEN_INSN *insn,
 237                    CGEN_FIELDS *fields,
 238                    bfd_vma pc,
 239                    int length)
 240 {
 241   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 242   disassemble_info *info = (disassemble_info *) dis_info;
 243   const CGEN_SYNTAX_CHAR_TYPE *syn;
 244
 245   CGEN_INIT_PRINT (cd);
 246
 247   for (syn = CGEN_SYNTAX_STRING (syntax); *syn; ++syn)
 248     {
 249       if (CGEN_SYNTAX_MNEMONIC_P (*syn))
 250         {
 251           (*info->fprintf_func) (info->stream, "%s", CGEN_INSN_MNEMONIC (insn));
 252           continue;
 253         }
 254       if (CGEN_SYNTAX_CHAR_P (*syn))
 255         {
 256           (*info->fprintf_func) (info->stream, "%c", CGEN_SYNTAX_CHAR (*syn));
 257           continue;
 258         }
 259
 260       /* We have an operand.  */
 261       or1k_cgen_print_operand (cd, CGEN_SYNTAX_FIELD (*syn), info,
 262                                  fields, CGEN_INSN_ATTRS (insn), pc, length);
 263     }
 264 }
 265 \f
 266 /* Subroutine of print_insn. Reads an insn into the given buffers and updates
 267    the extract info.
 268    Returns 0 if all is well, non-zero otherwise.  */
 269
 270 static int
 271 read_insn (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 272            bfd_vma pc,
 273            disassemble_info *info,
 274            bfd_byte *buf,
 275            int buflen,
 276            CGEN_EXTRACT_INFO *ex_info,
 277            unsigned long *insn_value)
 278 {
 279   int status = (*info->read_memory_func) (pc, buf, buflen, info);
 280
 281   if (status != 0)
 282     {
 283       (*info->memory_error_func) (status, pc, info);
 284       return -1;
 285     }
 286
 287   ex_info->dis_info = info;
 288   ex_info->valid = (1 << buflen) - 1;
 289   ex_info->insn_bytes = buf;
 290
 291   *insn_value = bfd_get_bits (buf, buflen * 8, info->endian == BFD_ENDIAN_BIG);
 292   return 0;
 293 }
 294
 295 /* Utility to print an insn.
 296    BUF is the base part of the insn, target byte order, BUFLEN bytes long.
 297    The result is the size of the insn in bytes or zero for an unknown insn
 298    or -1 if an error occurs fetching data (memory_error_func will have
 299    been called).  */
 300
 301 static int
 302 print_insn (CGEN_CPU_DESC cd,
 303             bfd_vma pc,
 304             disassemble_info *info,
 305             bfd_byte *buf,
 306             unsigned int buflen)
 307 {
 308   CGEN_INSN_INT insn_value;
 309   const CGEN_INSN_LIST *insn_list;
 310   CGEN_EXTRACT_INFO ex_info;
 311   int basesize;
 312
 313   /* Extract base part of instruction, just in case CGEN_DIS_* uses it. */
 314   basesize = cd->base_insn_bitsize < buflen * 8 ?
 315                                      cd->base_insn_bitsize : buflen * 8;
 316   insn_value = cgen_get_insn_value (cd, buf, basesize);
 317
 318
 319   /* Fill in ex_info fields like read_insn would.  Don't actually call
 320      read_insn, since the incoming buffer is already read (and possibly
 321      modified a la m32r).  */
 322   ex_info.valid = (1 << buflen) - 1;
 323   ex_info.dis_info = info;
 324   ex_info.insn_bytes = buf;
 325
 326   /* The instructions are stored in hash lists.
 327      Pick the first one and keep trying until we find the right one.  */
 328
 329   insn_list = CGEN_DIS_LOOKUP_INSN (cd, (char *) buf, insn_value);
 330   while (insn_list != NULL)
 331     {
 332       const CGEN_INSN *insn = insn_list->insn;
 333       CGEN_FIELDS fields;
 334       int length;
 335       unsigned long insn_value_cropped;
 336
 337 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 338       /* Not needed as insn shouldn't be in hash lists if not supported.  */
 339       /* Supported by this cpu?  */
 340       if (! or1k_cgen_insn_supported (cd, insn))
 341         {
 342           insn_list = CGEN_DIS_NEXT_INSN (insn_list);
 343           continue;
 344         }
 345 #endif
 346
 347       /* Basic bit mask must be correct.  */
 348       /* ??? May wish to allow target to defer this check until the extract
 349          handler.  */
 350
 351       /* Base size may exceed this instruction's size.  Extract the
 352          relevant part from the buffer. */
 353       if ((unsigned) (CGEN_INSN_BITSIZE (insn) / 8) < buflen &&
 354           (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
 355         insn_value_cropped = bfd_get_bits (buf, CGEN_INSN_BITSIZE (insn),
 356                                            info->endian == BFD_ENDIAN_BIG);
 357       else
 358         insn_value_cropped = insn_value;
 359
 360       if ((insn_value_cropped & CGEN_INSN_BASE_MASK (insn))
 361           == CGEN_INSN_BASE_VALUE (insn))
 362         {
 363           /* Printing is handled in two passes.  The first pass parses the
 364              machine insn and extracts the fields.  The second pass prints
 365              them.  */
 366
 367           /* Make sure the entire insn is loaded into insn_value, if it
 368              can fit.  */
 369           if (((unsigned) CGEN_INSN_BITSIZE (insn) > cd->base_insn_bitsize) &&
 370               (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
 371             {
 372               unsigned long full_insn_value;
 373               int rc = read_insn (cd, pc, info, buf,
 374                                   CGEN_INSN_BITSIZE (insn) / 8,
 375                                   & ex_info, & full_insn_value);
 376               if (rc != 0)
 377                 return rc;
 378               length = CGEN_EXTRACT_FN (cd, insn)
 379                 (cd, insn, &ex_info, full_insn_value, &fields, pc);
 380             }
 381           else
 382             length = CGEN_EXTRACT_FN (cd, insn)
 383               (cd, insn, &ex_info, insn_value_cropped, &fields, pc);
 384
 385           /* Length < 0 -> error.  */
 386           if (length < 0)
 387             return length;
 388           if (length > 0)
 389             {
 390               CGEN_PRINT_FN (cd, insn) (cd, info, insn, &fields, pc, length);
 391               /* Length is in bits, result is in bytes.  */
 392               return length / 8;
 393             }
 394         }
 395
 396       insn_list = CGEN_DIS_NEXT_INSN (insn_list);
 397     }
 398
 399   return 0;
 400 }
 401
 402 /* Default value for CGEN_PRINT_INSN.
 403    The result is the size of the insn in bytes or zero for an unknown insn
 404    or -1 if an error occured fetching bytes.  */
 405
 406 #ifndef CGEN_PRINT_INSN
 407 #define CGEN_PRINT_INSN default_print_insn
 408 #endif
 409
 410 static int
 411 default_print_insn (CGEN_CPU_DESC cd, bfd_vma pc, disassemble_info *info)
 412 {
 413   bfd_byte buf[CGEN_MAX_INSN_SIZE];
 414   int buflen;
 415   int status;
 416
 417   /* Attempt to read the base part of the insn.  */
 418   buflen = cd->base_insn_bitsize / 8;
 419   status = (*info->read_memory_func) (pc, buf, buflen, info);
 420
 421   /* Try again with the minimum part, if min < base.  */
 422   if (status != 0 && (cd->min_insn_bitsize < cd->base_insn_bitsize))
 423     {
 424       buflen = cd->min_insn_bitsize / 8;
 425       status = (*info->read_memory_func) (pc, buf, buflen, info);
 426     }
 427
 428   if (status != 0)
 429     {
 430       (*info->memory_error_func) (status, pc, info);
 431       return -1;
 432     }
 433
 434   return print_insn (cd, pc, info, buf, buflen);
 435 }
 436
 437 /* Main entry point.
 438    Print one instruction from PC on INFO->STREAM.
 439    Return the size of the instruction (in bytes).  */
 440
 441 typedef struct cpu_desc_list
 442 {
 443   struct cpu_desc_list *next;
 444   CGEN_BITSET *isa;
 445   int mach;
 446   int endian;
 447   CGEN_CPU_DESC cd;
 448 } cpu_desc_list;
 449
 450 int
 451 print_insn_or1k (bfd_vma pc, disassemble_info *info)
 452 {
 453   static cpu_desc_list *cd_list = 0;
 454   cpu_desc_list *cl = 0;
 455   static CGEN_CPU_DESC cd = 0;
 456   static CGEN_BITSET *prev_isa;
 457   static int prev_mach;
 458   static int prev_endian;
 459   int length;
 460   CGEN_BITSET *isa;
 461   int mach;
 462   int endian = (info->endian == BFD_ENDIAN_BIG
 463                 ? CGEN_ENDIAN_BIG
 464                 : CGEN_ENDIAN_LITTLE);
 465   enum bfd_architecture arch;
 466
 467   /* ??? gdb will set mach but leave the architecture as "unknown" */
 468 #ifndef CGEN_BFD_ARCH
 469 #define CGEN_BFD_ARCH bfd_arch_or1k
 470 #endif
 471   arch = info->arch;
 472   if (arch == bfd_arch_unknown)
 473     arch = CGEN_BFD_ARCH;
 474
 475   /* There's no standard way to compute the machine or isa number
 476      so we leave it to the target.  */
 477 #ifdef CGEN_COMPUTE_MACH
 478   mach = CGEN_COMPUTE_MACH (info);
 479 #else
 480   mach = info->mach;
 481 #endif
 482
 483 #ifdef CGEN_COMPUTE_ISA
 484   {
 485     static CGEN_BITSET *permanent_isa;
 486
 487     if (!permanent_isa)
 488       permanent_isa = cgen_bitset_create (MAX_ISAS);
 489     isa = permanent_isa;
 490     cgen_bitset_clear (isa);
 491     cgen_bitset_add (isa, CGEN_COMPUTE_ISA (info));
 492   }
 493 #else
 494   isa = info->insn_sets;
 495 #endif
 496
 497   /* If we've switched cpu's, try to find a handle we've used before */
 498   if (cd
 499       && (cgen_bitset_compare (isa, prev_isa) != 0
 500           || mach != prev_mach
 501           || endian != prev_endian))
 502     {
 503       cd = 0;
 504       for (cl = cd_list; cl; cl = cl->next)
 505         {
 506           if (cgen_bitset_compare (cl->isa, isa) == 0 &&
 507               cl->mach == mach &&
 508               cl->endian == endian)
 509             {
 510               cd = cl->cd;
 511               prev_isa = cd->isas;
 512               break;
 513             }
 514         }
 515     }
 516
 517   /* If we haven't initialized yet, initialize the opcode table.  */
 518   if (! cd)
 519     {
 520       const bfd_arch_info_type *arch_type = bfd_lookup_arch (arch, mach);
 521       const char *mach_name;
 522
 523       if (!arch_type)
 524         abort ();
 525       mach_name = arch_type->printable_name;
 526
 527       prev_isa = cgen_bitset_copy (isa);
 528       prev_mach = mach;
 529       prev_endian = endian;
 530       cd = or1k_cgen_cpu_open (CGEN_CPU_OPEN_ISAS, prev_isa,
 531                                  CGEN_CPU_OPEN_BFDMACH, mach_name,
 532                                  CGEN_CPU_OPEN_ENDIAN, prev_endian,
 533                                  CGEN_CPU_OPEN_END);
 534       if (!cd)
 535         abort ();
 536
 537       /* Save this away for future reference.  */
 538       cl = xmalloc (sizeof (struct cpu_desc_list));
 539       cl->cd = cd;
 540       cl->isa = prev_isa;
 541       cl->mach = mach;
 542       cl->endian = endian;
 543       cl->next = cd_list;
 544       cd_list = cl;
 545
 546       or1k_cgen_init_dis (cd);
 547     }
 548
 549   /* We try to have as much common code as possible.
 550      But at this point some targets need to take over.  */
 551   /* ??? Some targets may need a hook elsewhere.  Try to avoid this,
 552      but if not possible try to move this hook elsewhere rather than
 553      have two hooks.  */
 554   length = CGEN_PRINT_INSN (cd, pc, info);
 555   if (length > 0)
 556     return length;
 557   if (length < 0)
 558     return -1;
 559
 560   (*info->fprintf_func) (info->stream, UNKNOWN_INSN_MSG);
 561   return cd->default_insn_bitsize / 8;
 562 }