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 (C) 1996-2015 Free Software Foundation, Inc.
   8
   9    This file is part of libopcodes.
  10
  11    This library is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3, or (at your option)
  14    any later version.
  15
  16    It is distributed in the hope that it will be useful, but WITHOUT
  17    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  18    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  19    License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program; if not, write to the Free Software Foundation, Inc.,
  23    51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  24
  25 /* ??? Eventually more and more of this stuff can go to cpu-independent files.
  26    Keep that in mind.  */
  27
  28 #include "sysdep.h"
  29 #include <stdio.h>
  30 #include "ansidecl.h"
  31 #include "dis-asm.h"
  32 #include "bfd.h"
  33 #include "symcat.h"
  34 #include "libiberty.h"
  35 #include "or1k-desc.h"
  36 #include "or1k-opc.h"
  37 #include "opintl.h"
  38
  39 /* Default text to print if an instruction isn't recognized.  */
  40 #define UNKNOWN_INSN_MSG _("*unknown*")
  41
  42 static void print_normal
  43   (CGEN_CPU_DESC, void *, long, unsigned int, bfd_vma, int);
  44 static void print_address
  45   (CGEN_CPU_DESC, void *, bfd_vma, unsigned int, bfd_vma, int) ATTRIBUTE_UNUSED;
  46 static void print_keyword
  47   (CGEN_CPU_DESC, void *, CGEN_KEYWORD *, long, unsigned int) ATTRIBUTE_UNUSED;
  48 static void print_insn_normal
  49   (CGEN_CPU_DESC, void *, const CGEN_INSN *, CGEN_FIELDS *, bfd_vma, int);
  50 static int print_insn
  51   (CGEN_CPU_DESC, bfd_vma,  disassemble_info *, bfd_byte *, unsigned);
  52 static int default_print_insn
  53   (CGEN_CPU_DESC, bfd_vma, disassemble_info *) ATTRIBUTE_UNUSED;
  54 static int read_insn
  55   (CGEN_CPU_DESC, bfd_vma, disassemble_info *, bfd_byte *, int, CGEN_EXTRACT_INFO *,
  56    unsigned long *);
  57 \f
  58 /* -- disassembler routines inserted here.  */
  59
  60
  61 void or1k_cgen_print_operand
  62   (CGEN_CPU_DESC, int, PTR, CGEN_FIELDS *, void const *, bfd_vma, int);
  63
  64 /* Main entry point for printing operands.
  65    XINFO is a `void *' and not a `disassemble_info *' to not put a requirement
  66    of dis-asm.h on cgen.h.
  67
  68    This function is basically just a big switch statement.  Earlier versions
  69    used tables to look up the function to use, but
  70    - if the table contains both assembler and disassembler functions then
  71      the disassembler contains much of the assembler and vice-versa,
  72    - there's a lot of inlining possibilities as things grow,
  73    - using a switch statement avoids the function call overhead.
  74
  75    This function could be moved into `print_insn_normal', but keeping it
  76    separate makes clear the interface between `print_insn_normal' and each of
  77    the handlers.  */
  78
  79 void
  80 or1k_cgen_print_operand (CGEN_CPU_DESC cd,
  81                            int opindex,
  82                            void * xinfo,
  83                            CGEN_FIELDS *fields,
  84                            void const *attrs ATTRIBUTE_UNUSED,
  85                            bfd_vma pc,
  86                            int length)
  87 {
  88   disassemble_info *info = (disassemble_info *) xinfo;
  89
  90   switch (opindex)
  91     {
  92     case OR1K_OPERAND_DISP26 :
  93       print_address (cd, info, fields->f_disp26, 0|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
  94       break;
  95     case OR1K_OPERAND_RA :
  96       print_keyword (cd, info, & or1k_cgen_opval_h_gpr, fields->f_r2, 0);
  97       break;
  98     case OR1K_OPERAND_RADF :
  99       print_keyword (cd, info, & or1k_cgen_opval_h_fdr, fields->f_r1, 0);
 100       break;
 101     case OR1K_OPERAND_RASF :
 102       print_keyword (cd, info, & or1k_cgen_opval_h_fsr, fields->f_r2, 0);
 103       break;
 104     case OR1K_OPERAND_RB :
 105       print_keyword (cd, info, & or1k_cgen_opval_h_gpr, fields->f_r3, 0);
 106       break;
 107     case OR1K_OPERAND_RBDF :
 108       print_keyword (cd, info, & or1k_cgen_opval_h_fdr, fields->f_r1, 0);
 109       break;
 110     case OR1K_OPERAND_RBSF :
 111       print_keyword (cd, info, & or1k_cgen_opval_h_fsr, fields->f_r3, 0);
 112       break;
 113     case OR1K_OPERAND_RD :
 114       print_keyword (cd, info, & or1k_cgen_opval_h_gpr, fields->f_r1, 0);
 115       break;
 116     case OR1K_OPERAND_RDDF :
 117       print_keyword (cd, info, & or1k_cgen_opval_h_fdr, fields->f_r1, 0);
 118       break;
 119     case OR1K_OPERAND_RDSF :
 120       print_keyword (cd, info, & or1k_cgen_opval_h_fsr, fields->f_r1, 0);
 121       break;
 122     case OR1K_OPERAND_SIMM16 :
 123       print_normal (cd, info, fields->f_simm16, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_SIGN_OPT), pc, length);
 124       break;
 125     case OR1K_OPERAND_SIMM16_SPLIT :
 126       print_normal (cd, info, fields->f_simm16_split, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_SIGN_OPT)|(1<<CGEN_OPERAND_VIRTUAL), pc, length);
 127       break;
 128     case OR1K_OPERAND_UIMM16 :
 129       print_normal (cd, info, fields->f_uimm16, 0, pc, length);
 130       break;
 131     case OR1K_OPERAND_UIMM16_SPLIT :
 132       print_normal (cd, info, fields->f_uimm16_split, 0|(1<<CGEN_OPERAND_VIRTUAL), pc, length);
 133       break;
 134     case OR1K_OPERAND_UIMM6 :
 135       print_normal (cd, info, fields->f_uimm6, 0, pc, length);
 136       break;
 137
 138     default :
 139       /* xgettext:c-format */
 140       fprintf (stderr, _("Unrecognized field %d while printing insn.\n"),
 141                opindex);
 142     abort ();
 143   }
 144 }
 145
 146 cgen_print_fn * const or1k_cgen_print_handlers[] =
 147 {
 148   print_insn_normal,
 149 };
 150
 151
 152 void
 153 or1k_cgen_init_dis (CGEN_CPU_DESC cd)
 154 {
 155   or1k_cgen_init_opcode_table (cd);
 156   or1k_cgen_init_ibld_table (cd);
 157   cd->print_handlers = & or1k_cgen_print_handlers[0];
 158   cd->print_operand = or1k_cgen_print_operand;
 159 }
 160
 161 \f
 162 /* Default print handler.  */
 163
 164 static void
 165 print_normal (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 166               void *dis_info,
 167               long value,
 168               unsigned int attrs,
 169               bfd_vma pc ATTRIBUTE_UNUSED,
 170               int length ATTRIBUTE_UNUSED)
 171 {
 172   disassemble_info *info = (disassemble_info *) dis_info;
 173
 174   /* Print the operand as directed by the attributes.  */
 175   if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
 176     ; /* nothing to do */
 177   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
 178     (*info->fprintf_func) (info->stream, "%ld", value);
 179   else
 180     (*info->fprintf_func) (info->stream, "0x%lx", value);
 181 }
 182
 183 /* Default address handler.  */
 184
 185 static void
 186 print_address (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 187                void *dis_info,
 188                bfd_vma value,
 189                unsigned int attrs,
 190                bfd_vma pc ATTRIBUTE_UNUSED,
 191                int length ATTRIBUTE_UNUSED)
 192 {
 193   disassemble_info *info = (disassemble_info *) dis_info;
 194
 195   /* Print the operand as directed by the attributes.  */
 196   if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
 197     ; /* Nothing to do.  */
 198   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_PCREL_ADDR))
 199     (*info->print_address_func) (value, info);
 200   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_ABS_ADDR))
 201     (*info->print_address_func) (value, info);
 202   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
 203     (*info->fprintf_func) (info->stream, "%ld", (long) value);
 204   else
 205     (*info->fprintf_func) (info->stream, "0x%lx", (long) value);
 206 }
 207
 208 /* Keyword print handler.  */
 209
 210 static void
 211 print_keyword (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 212                void *dis_info,
 213                CGEN_KEYWORD *keyword_table,
 214                long value,
 215                unsigned int attrs ATTRIBUTE_UNUSED)
 216 {
 217   disassemble_info *info = (disassemble_info *) dis_info;
 218   const CGEN_KEYWORD_ENTRY *ke;
 219
 220   ke = cgen_keyword_lookup_value (keyword_table, value);
 221   if (ke != NULL)
 222     (*info->fprintf_func) (info->stream, "%s", ke->name);
 223   else
 224     (*info->fprintf_func) (info->stream, "???");
 225 }
 226 \f
 227 /* Default insn printer.
 228
 229    DIS_INFO is defined as `void *' so the disassembler needn't know anything
 230    about disassemble_info.  */
 231
 232 static void
 233 print_insn_normal (CGEN_CPU_DESC cd,
 234                    void *dis_info,
 235                    const CGEN_INSN *insn,
 236                    CGEN_FIELDS *fields,
 237                    bfd_vma pc,
 238                    int length)
 239 {
 240   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 241   disassemble_info *info = (disassemble_info *) dis_info;
 242   const CGEN_SYNTAX_CHAR_TYPE *syn;
 243
 244   CGEN_INIT_PRINT (cd);
 245
 246   for (syn = CGEN_SYNTAX_STRING (syntax); *syn; ++syn)
 247     {
 248       if (CGEN_SYNTAX_MNEMONIC_P (*syn))
 249         {
 250           (*info->fprintf_func) (info->stream, "%s", CGEN_INSN_MNEMONIC (insn));
 251           continue;
 252         }
 253       if (CGEN_SYNTAX_CHAR_P (*syn))
 254         {
 255           (*info->fprintf_func) (info->stream, "%c", CGEN_SYNTAX_CHAR (*syn));
 256           continue;
 257         }
 258
 259       /* We have an operand.  */
 260       or1k_cgen_print_operand (cd, CGEN_SYNTAX_FIELD (*syn), info,
 261                                  fields, CGEN_INSN_ATTRS (insn), pc, length);
 262     }
 263 }
 264 \f
 265 /* Subroutine of print_insn. Reads an insn into the given buffers and updates
 266    the extract info.
 267    Returns 0 if all is well, non-zero otherwise.  */
 268
 269 static int
 270 read_insn (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 271            bfd_vma pc,
 272            disassemble_info *info,
 273            bfd_byte *buf,
 274            int buflen,
 275            CGEN_EXTRACT_INFO *ex_info,
 276            unsigned long *insn_value)
 277 {
 278   int status = (*info->read_memory_func) (pc, buf, buflen, info);
 279
 280   if (status != 0)
 281     {
 282       (*info->memory_error_func) (status, pc, info);
 283       return -1;
 284     }
 285
 286   ex_info->dis_info = info;
 287   ex_info->valid = (1 << buflen) - 1;
 288   ex_info->insn_bytes = buf;
 289
 290   *insn_value = bfd_get_bits (buf, buflen * 8, info->endian == BFD_ENDIAN_BIG);
 291   return 0;
 292 }
 293
 294 /* Utility to print an insn.
 295    BUF is the base part of the insn, target byte order, BUFLEN bytes long.
 296    The result is the size of the insn in bytes or zero for an unknown insn
 297    or -1 if an error occurs fetching data (memory_error_func will have
 298    been called).  */
 299
 300 static int
 301 print_insn (CGEN_CPU_DESC cd,
 302             bfd_vma pc,
 303             disassemble_info *info,
 304             bfd_byte *buf,
 305             unsigned int buflen)
 306 {
 307   CGEN_INSN_INT insn_value;
 308   const CGEN_INSN_LIST *insn_list;
 309   CGEN_EXTRACT_INFO ex_info;
 310   int basesize;
 311
 312   /* Extract base part of instruction, just in case CGEN_DIS_* uses it. */
 313   basesize = cd->base_insn_bitsize < buflen * 8 ?
 314                                      cd->base_insn_bitsize : buflen * 8;
 315   insn_value = cgen_get_insn_value (cd, buf, basesize);
 316
 317
 318   /* Fill in ex_info fields like read_insn would.  Don't actually call
 319      read_insn, since the incoming buffer is already read (and possibly
 320      modified a la m32r).  */
 321   ex_info.valid = (1 << buflen) - 1;
 322   ex_info.dis_info = info;
 323   ex_info.insn_bytes = buf;
 324
 325   /* The instructions are stored in hash lists.
 326      Pick the first one and keep trying until we find the right one.  */
 327
 328   insn_list = CGEN_DIS_LOOKUP_INSN (cd, (char *) buf, insn_value);
 329   while (insn_list != NULL)
 330     {
 331       const CGEN_INSN *insn = insn_list->insn;
 332       CGEN_FIELDS fields;
 333       int length;
 334       unsigned long insn_value_cropped;
 335
 336 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 337       /* Not needed as insn shouldn't be in hash lists if not supported.  */
 338       /* Supported by this cpu?  */
 339       if (! or1k_cgen_insn_supported (cd, insn))
 340         {
 341           insn_list = CGEN_DIS_NEXT_INSN (insn_list);
 342           continue;
 343         }
 344 #endif
 345
 346       /* Basic bit mask must be correct.  */
 347       /* ??? May wish to allow target to defer this check until the extract
 348          handler.  */
 349
 350       /* Base size may exceed this instruction's size.  Extract the
 351          relevant part from the buffer. */
 352       if ((unsigned) (CGEN_INSN_BITSIZE (insn) / 8) < buflen &&
 353           (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
 354         insn_value_cropped = bfd_get_bits (buf, CGEN_INSN_BITSIZE (insn),
 355                                            info->endian == BFD_ENDIAN_BIG);
 356       else
 357         insn_value_cropped = insn_value;
 358
 359       if ((insn_value_cropped & CGEN_INSN_BASE_MASK (insn))
 360           == CGEN_INSN_BASE_VALUE (insn))
 361         {
 362           /* Printing is handled in two passes.  The first pass parses the
 363              machine insn and extracts the fields.  The second pass prints
 364              them.  */
 365
 366           /* Make sure the entire insn is loaded into insn_value, if it
 367              can fit.  */
 368           if (((unsigned) CGEN_INSN_BITSIZE (insn) > cd->base_insn_bitsize) &&
 369               (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
 370             {
 371               unsigned long full_insn_value;
 372               int rc = read_insn (cd, pc, info, buf,
 373                                   CGEN_INSN_BITSIZE (insn) / 8,
 374                                   & ex_info, & full_insn_value);
 375               if (rc != 0)
 376                 return rc;
 377               length = CGEN_EXTRACT_FN (cd, insn)
 378                 (cd, insn, &ex_info, full_insn_value, &fields, pc);
 379             }
 380           else
 381             length = CGEN_EXTRACT_FN (cd, insn)
 382               (cd, insn, &ex_info, insn_value_cropped, &fields, pc);
 383
 384           /* Length < 0 -> error.  */
 385           if (length < 0)
 386             return length;
 387           if (length > 0)
 388             {
 389               CGEN_PRINT_FN (cd, insn) (cd, info, insn, &fields, pc, length);
 390               /* Length is in bits, result is in bytes.  */
 391               return length / 8;
 392             }
 393         }
 394
 395       insn_list = CGEN_DIS_NEXT_INSN (insn_list);
 396     }
 397
 398   return 0;
 399 }
 400
 401 /* Default value for CGEN_PRINT_INSN.
 402    The result is the size of the insn in bytes or zero for an unknown insn
 403    or -1 if an error occured fetching bytes.  */
 404
 405 #ifndef CGEN_PRINT_INSN
 406 #define CGEN_PRINT_INSN default_print_insn
 407 #endif
 408
 409 static int
 410 default_print_insn (CGEN_CPU_DESC cd, bfd_vma pc, disassemble_info *info)
 411 {
 412   bfd_byte buf[CGEN_MAX_INSN_SIZE];
 413   int buflen;
 414   int status;
 415
 416   /* Attempt to read the base part of the insn.  */
 417   buflen = cd->base_insn_bitsize / 8;
 418   status = (*info->read_memory_func) (pc, buf, buflen, info);
 419
 420   /* Try again with the minimum part, if min < base.  */
 421   if (status != 0 && (cd->min_insn_bitsize < cd->base_insn_bitsize))
 422     {
 423       buflen = cd->min_insn_bitsize / 8;
 424       status = (*info->read_memory_func) (pc, buf, buflen, info);
 425     }
 426
 427   if (status != 0)
 428     {
 429       (*info->memory_error_func) (status, pc, info);
 430       return -1;
 431     }
 432
 433   return print_insn (cd, pc, info, buf, buflen);
 434 }
 435
 436 /* Main entry point.
 437    Print one instruction from PC on INFO->STREAM.
 438    Return the size of the instruction (in bytes).  */
 439
 440 typedef struct cpu_desc_list
 441 {
 442   struct cpu_desc_list *next;
 443   CGEN_BITSET *isa;
 444   int mach;
 445   int endian;
 446   CGEN_CPU_DESC cd;
 447 } cpu_desc_list;
 448
 449 int
 450 print_insn_or1k (bfd_vma pc, disassemble_info *info)
 451 {
 452   static cpu_desc_list *cd_list = 0;
 453   cpu_desc_list *cl = 0;
 454   static CGEN_CPU_DESC cd = 0;
 455   static CGEN_BITSET *prev_isa;
 456   static int prev_mach;
 457   static int prev_endian;
 458   int length;
 459   CGEN_BITSET *isa;
 460   int mach;
 461   int endian = (info->endian == BFD_ENDIAN_BIG
 462                 ? CGEN_ENDIAN_BIG
 463                 : CGEN_ENDIAN_LITTLE);
 464   enum bfd_architecture arch;
 465
 466   /* ??? gdb will set mach but leave the architecture as "unknown" */
 467 #ifndef CGEN_BFD_ARCH
 468 #define CGEN_BFD_ARCH bfd_arch_or1k
 469 #endif
 470   arch = info->arch;
 471   if (arch == bfd_arch_unknown)
 472     arch = CGEN_BFD_ARCH;
 473
 474   /* There's no standard way to compute the machine or isa number
 475      so we leave it to the target.  */
 476 #ifdef CGEN_COMPUTE_MACH
 477   mach = CGEN_COMPUTE_MACH (info);
 478 #else
 479   mach = info->mach;
 480 #endif
 481
 482 #ifdef CGEN_COMPUTE_ISA
 483   {
 484     static CGEN_BITSET *permanent_isa;
 485
 486     if (!permanent_isa)
 487       permanent_isa = cgen_bitset_create (MAX_ISAS);
 488     isa = permanent_isa;
 489     cgen_bitset_clear (isa);
 490     cgen_bitset_add (isa, CGEN_COMPUTE_ISA (info));
 491   }
 492 #else
 493   isa = info->insn_sets;
 494 #endif
 495
 496   /* If we've switched cpu's, try to find a handle we've used before */
 497   if (cd
 498       && (cgen_bitset_compare (isa, prev_isa) != 0
 499           || mach != prev_mach
 500           || endian != prev_endian))
 501     {
 502       cd = 0;
 503       for (cl = cd_list; cl; cl = cl->next)
 504         {
 505           if (cgen_bitset_compare (cl->isa, isa) == 0 &&
 506               cl->mach == mach &&
 507               cl->endian == endian)
 508             {
 509               cd = cl->cd;
 510               prev_isa = cd->isas;
 511               break;
 512             }
 513         }
 514     }
 515
 516   /* If we haven't initialized yet, initialize the opcode table.  */
 517   if (! cd)
 518     {
 519       const bfd_arch_info_type *arch_type = bfd_lookup_arch (arch, mach);
 520       const char *mach_name;
 521
 522       if (!arch_type)
 523         abort ();
 524       mach_name = arch_type->printable_name;
 525
 526       prev_isa = cgen_bitset_copy (isa);
 527       prev_mach = mach;
 528       prev_endian = endian;
 529       cd = or1k_cgen_cpu_open (CGEN_CPU_OPEN_ISAS, prev_isa,
 530                                  CGEN_CPU_OPEN_BFDMACH, mach_name,
 531                                  CGEN_CPU_OPEN_ENDIAN, prev_endian,
 532                                  CGEN_CPU_OPEN_END);
 533       if (!cd)
 534         abort ();
 535
 536       /* Save this away for future reference.  */
 537       cl = xmalloc (sizeof (struct cpu_desc_list));
 538       cl->cd = cd;
 539       cl->isa = prev_isa;
 540       cl->mach = mach;
 541       cl->endian = endian;
 542       cl->next = cd_list;
 543       cd_list = cl;
 544
 545       or1k_cgen_init_dis (cd);
 546     }
 547
 548   /* We try to have as much common code as possible.
 549      But at this point some targets need to take over.  */
 550   /* ??? Some targets may need a hook elsewhere.  Try to avoid this,
 551      but if not possible try to move this hook elsewhere rather than
 552      have two hooks.  */
 553   length = CGEN_PRINT_INSN (cd, pc, info);
 554   if (length > 0)
 555     return length;
 556   if (length < 0)
 557     return -1;
 558
 559   (*info->fprintf_func) (info->stream, UNKNOWN_INSN_MSG);
 560   return cd->default_insn_bitsize / 8;
 561 }