opcodes/cgen-dis.in

   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 "@prefix@-desc.h"
  37 #include "@prefix@-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 \f
  61 /* Default print handler.  */
  62
  63 static void
  64 print_normal (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
  65               void *dis_info,
  66               long value,
  67               unsigned int attrs,
  68               bfd_vma pc ATTRIBUTE_UNUSED,
  69               int length ATTRIBUTE_UNUSED)
  70 {
  71   disassemble_info *info = (disassemble_info *) dis_info;
  72
  73 #ifdef CGEN_PRINT_NORMAL
  74   CGEN_PRINT_NORMAL (cd, info, value, attrs, pc, length);
  75 #endif
  76
  77   /* Print the operand as directed by the attributes.  */
  78   if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
  79     ; /* nothing to do */
  80   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
  81     (*info->fprintf_func) (info->stream, "%ld", value);
  82   else
  83     (*info->fprintf_func) (info->stream, "0x%lx", value);
  84 }
  85
  86 /* Default address handler.  */
  87
  88 static void
  89 print_address (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
  90                void *dis_info,
  91                bfd_vma value,
  92                unsigned int attrs,
  93                bfd_vma pc ATTRIBUTE_UNUSED,
  94                int length ATTRIBUTE_UNUSED)
  95 {
  96   disassemble_info *info = (disassemble_info *) dis_info;
  97
  98 #ifdef CGEN_PRINT_ADDRESS
  99   CGEN_PRINT_ADDRESS (cd, info, value, attrs, pc, length);
 100 #endif
 101
 102   /* Print the operand as directed by the attributes.  */
 103   if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
 104     ; /* Nothing to do.  */
 105   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_PCREL_ADDR))
 106     (*info->print_address_func) (value, info);
 107   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_ABS_ADDR))
 108     (*info->print_address_func) (value, info);
 109   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
 110     (*info->fprintf_func) (info->stream, "%ld", (long) value);
 111   else
 112     (*info->fprintf_func) (info->stream, "0x%lx", (long) value);
 113 }
 114
 115 /* Keyword print handler.  */
 116
 117 static void
 118 print_keyword (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 119                void *dis_info,
 120                CGEN_KEYWORD *keyword_table,
 121                long value,
 122                unsigned int attrs ATTRIBUTE_UNUSED)
 123 {
 124   disassemble_info *info = (disassemble_info *) dis_info;
 125   const CGEN_KEYWORD_ENTRY *ke;
 126
 127   ke = cgen_keyword_lookup_value (keyword_table, value);
 128   if (ke != NULL)
 129     (*info->fprintf_func) (info->stream, "%s", ke->name);
 130   else
 131     (*info->fprintf_func) (info->stream, "???");
 132 }
 133 \f
 134 /* Default insn printer.
 135
 136    DIS_INFO is defined as `void *' so the disassembler needn't know anything
 137    about disassemble_info.  */
 138
 139 static void
 140 print_insn_normal (CGEN_CPU_DESC cd,
 141                    void *dis_info,
 142                    const CGEN_INSN *insn,
 143                    CGEN_FIELDS *fields,
 144                    bfd_vma pc,
 145                    int length)
 146 {
 147   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 148   disassemble_info *info = (disassemble_info *) dis_info;
 149   const CGEN_SYNTAX_CHAR_TYPE *syn;
 150
 151   CGEN_INIT_PRINT (cd);
 152
 153   for (syn = CGEN_SYNTAX_STRING (syntax); *syn; ++syn)
 154     {
 155       if (CGEN_SYNTAX_MNEMONIC_P (*syn))
 156         {
 157           (*info->fprintf_func) (info->stream, "%s", CGEN_INSN_MNEMONIC (insn));
 158           continue;
 159         }
 160       if (CGEN_SYNTAX_CHAR_P (*syn))
 161         {
 162           (*info->fprintf_func) (info->stream, "%c", CGEN_SYNTAX_CHAR (*syn));
 163           continue;
 164         }
 165
 166       /* We have an operand.  */
 167       @arch@_cgen_print_operand (cd, CGEN_SYNTAX_FIELD (*syn), info,
 168                                  fields, CGEN_INSN_ATTRS (insn), pc, length);
 169     }
 170 }
 171 \f
 172 /* Subroutine of print_insn. Reads an insn into the given buffers and updates
 173    the extract info.
 174    Returns 0 if all is well, non-zero otherwise.  */
 175
 176 static int
 177 read_insn (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 178            bfd_vma pc,
 179            disassemble_info *info,
 180            bfd_byte *buf,
 181            int buflen,
 182            CGEN_EXTRACT_INFO *ex_info,
 183            unsigned long *insn_value)
 184 {
 185   int status = (*info->read_memory_func) (pc, buf, buflen, info);
 186
 187   if (status != 0)
 188     {
 189       (*info->memory_error_func) (status, pc, info);
 190       return -1;
 191     }
 192
 193   ex_info->dis_info = info;
 194   ex_info->valid = (1 << buflen) - 1;
 195   ex_info->insn_bytes = buf;
 196
 197   *insn_value = bfd_get_bits (buf, buflen * 8, info->endian == BFD_ENDIAN_BIG);
 198   return 0;
 199 }
 200
 201 /* Utility to print an insn.
 202    BUF is the base part of the insn, target byte order, BUFLEN bytes long.
 203    The result is the size of the insn in bytes or zero for an unknown insn
 204    or -1 if an error occurs fetching data (memory_error_func will have
 205    been called).  */
 206
 207 static int
 208 print_insn (CGEN_CPU_DESC cd,
 209             bfd_vma pc,
 210             disassemble_info *info,
 211             bfd_byte *buf,
 212             unsigned int buflen)
 213 {
 214   CGEN_INSN_INT insn_value;
 215   const CGEN_INSN_LIST *insn_list;
 216   CGEN_EXTRACT_INFO ex_info;
 217   int basesize;
 218
 219   /* Extract base part of instruction, just in case CGEN_DIS_* uses it. */
 220   basesize = cd->base_insn_bitsize < buflen * 8 ?
 221                                      cd->base_insn_bitsize : buflen * 8;
 222   insn_value = cgen_get_insn_value (cd, buf, basesize);
 223
 224
 225   /* Fill in ex_info fields like read_insn would.  Don't actually call
 226      read_insn, since the incoming buffer is already read (and possibly
 227      modified a la m32r).  */
 228   ex_info.valid = (1 << buflen) - 1;
 229   ex_info.dis_info = info;
 230   ex_info.insn_bytes = buf;
 231
 232   /* The instructions are stored in hash lists.
 233      Pick the first one and keep trying until we find the right one.  */
 234
 235   insn_list = CGEN_DIS_LOOKUP_INSN (cd, (char *) buf, insn_value);
 236   while (insn_list != NULL)
 237     {
 238       const CGEN_INSN *insn = insn_list->insn;
 239       CGEN_FIELDS fields;
 240       int length;
 241       unsigned long insn_value_cropped;
 242
 243 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 244       /* Not needed as insn shouldn't be in hash lists if not supported.  */
 245       /* Supported by this cpu?  */
 246       if (! @arch@_cgen_insn_supported (cd, insn))
 247         {
 248           insn_list = CGEN_DIS_NEXT_INSN (insn_list);
 249           continue;
 250         }
 251 #endif
 252
 253       /* Basic bit mask must be correct.  */
 254       /* ??? May wish to allow target to defer this check until the extract
 255          handler.  */
 256
 257       /* Base size may exceed this instruction's size.  Extract the
 258          relevant part from the buffer. */
 259       if ((unsigned) (CGEN_INSN_BITSIZE (insn) / 8) < buflen &&
 260           (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
 261         insn_value_cropped = bfd_get_bits (buf, CGEN_INSN_BITSIZE (insn),
 262                                            info->endian == BFD_ENDIAN_BIG);
 263       else
 264         insn_value_cropped = insn_value;
 265
 266       if ((insn_value_cropped & CGEN_INSN_BASE_MASK (insn))
 267           == CGEN_INSN_BASE_VALUE (insn))
 268         {
 269           /* Printing is handled in two passes.  The first pass parses the
 270              machine insn and extracts the fields.  The second pass prints
 271              them.  */
 272
 273           /* Make sure the entire insn is loaded into insn_value, if it
 274              can fit.  */
 275           if (((unsigned) CGEN_INSN_BITSIZE (insn) > cd->base_insn_bitsize) &&
 276               (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
 277             {
 278               unsigned long full_insn_value;
 279               int rc = read_insn (cd, pc, info, buf,
 280                                   CGEN_INSN_BITSIZE (insn) / 8,
 281                                   & ex_info, & full_insn_value);
 282               if (rc != 0)
 283                 return rc;
 284               length = CGEN_EXTRACT_FN (cd, insn)
 285                 (cd, insn, &ex_info, full_insn_value, &fields, pc);
 286             }
 287           else
 288             length = CGEN_EXTRACT_FN (cd, insn)
 289               (cd, insn, &ex_info, insn_value_cropped, &fields, pc);
 290
 291           /* Length < 0 -> error.  */
 292           if (length < 0)
 293             return length;
 294           if (length > 0)
 295             {
 296               CGEN_PRINT_FN (cd, insn) (cd, info, insn, &fields, pc, length);
 297               /* Length is in bits, result is in bytes.  */
 298               return length / 8;
 299             }
 300         }
 301
 302       insn_list = CGEN_DIS_NEXT_INSN (insn_list);
 303     }
 304
 305   return 0;
 306 }
 307
 308 /* Default value for CGEN_PRINT_INSN.
 309    The result is the size of the insn in bytes or zero for an unknown insn
 310    or -1 if an error occured fetching bytes.  */
 311
 312 #ifndef CGEN_PRINT_INSN
 313 #define CGEN_PRINT_INSN default_print_insn
 314 #endif
 315
 316 static int
 317 default_print_insn (CGEN_CPU_DESC cd, bfd_vma pc, disassemble_info *info)
 318 {
 319   bfd_byte buf[CGEN_MAX_INSN_SIZE];
 320   int buflen;
 321   int status;
 322
 323   /* Attempt to read the base part of the insn.  */
 324   buflen = cd->base_insn_bitsize / 8;
 325   status = (*info->read_memory_func) (pc, buf, buflen, info);
 326
 327   /* Try again with the minimum part, if min < base.  */
 328   if (status != 0 && (cd->min_insn_bitsize < cd->base_insn_bitsize))
 329     {
 330       buflen = cd->min_insn_bitsize / 8;
 331       status = (*info->read_memory_func) (pc, buf, buflen, info);
 332     }
 333
 334   if (status != 0)
 335     {
 336       (*info->memory_error_func) (status, pc, info);
 337       return -1;
 338     }
 339
 340   return print_insn (cd, pc, info, buf, buflen);
 341 }
 342
 343 /* Main entry point.
 344    Print one instruction from PC on INFO->STREAM.
 345    Return the size of the instruction (in bytes).  */
 346
 347 typedef struct cpu_desc_list
 348 {
 349   struct cpu_desc_list *next;
 350   int isa;
 351   int mach;
 352   int endian;
 353   CGEN_CPU_DESC cd;
 354 } cpu_desc_list;
 355
 356 int
 357 print_insn_@arch@ (bfd_vma pc, disassemble_info *info)
 358 {
 359   static cpu_desc_list *cd_list = 0;
 360   cpu_desc_list *cl = 0;
 361   static CGEN_CPU_DESC cd = 0;
 362   static int prev_isa;
 363   static int prev_mach;
 364   static int prev_endian;
 365   int length;
 366   int isa,mach;
 367   int endian = (info->endian == BFD_ENDIAN_BIG
 368                 ? CGEN_ENDIAN_BIG
 369                 : CGEN_ENDIAN_LITTLE);
 370   enum bfd_architecture arch;
 371
 372   /* ??? gdb will set mach but leave the architecture as "unknown" */
 373 #ifndef CGEN_BFD_ARCH
 374 #define CGEN_BFD_ARCH bfd_arch_@arch@
 375 #endif
 376   arch = info->arch;
 377   if (arch == bfd_arch_unknown)
 378     arch = CGEN_BFD_ARCH;
 379
 380   /* There's no standard way to compute the machine or isa number
 381      so we leave it to the target.  */
 382 #ifdef CGEN_COMPUTE_MACH
 383   mach = CGEN_COMPUTE_MACH (info);
 384 #else
 385   mach = info->mach;
 386 #endif
 387
 388 #ifdef CGEN_COMPUTE_ISA
 389   isa = CGEN_COMPUTE_ISA (info);
 390 #else
 391   isa = info->insn_sets;
 392 #endif
 393
 394   /* If we've switched cpu's, try to find a handle we've used before */
 395   if (cd
 396       && (isa != prev_isa
 397           || mach != prev_mach
 398           || endian != prev_endian))
 399     {
 400       cd = 0;
 401       for (cl = cd_list; cl; cl = cl->next)
 402         {
 403           if (cl->isa == isa &&
 404               cl->mach == mach &&
 405               cl->endian == endian)
 406             {
 407               cd = cl->cd;
 408               break;
 409             }
 410         }
 411     }
 412
 413   /* If we haven't initialized yet, initialize the opcode table.  */
 414   if (! cd)
 415     {
 416       const bfd_arch_info_type *arch_type = bfd_lookup_arch (arch, mach);
 417       const char *mach_name;
 418
 419       if (!arch_type)
 420         abort ();
 421       mach_name = arch_type->printable_name;
 422
 423       prev_isa = isa;
 424       prev_mach = mach;
 425       prev_endian = endian;
 426       cd = @arch@_cgen_cpu_open (CGEN_CPU_OPEN_ISAS, prev_isa,
 427                                  CGEN_CPU_OPEN_BFDMACH, mach_name,
 428                                  CGEN_CPU_OPEN_ENDIAN, prev_endian,
 429                                  CGEN_CPU_OPEN_END);
 430       if (!cd)
 431         abort ();
 432
 433       /* Save this away for future reference.  */
 434       cl = xmalloc (sizeof (struct cpu_desc_list));
 435       cl->cd = cd;
 436       cl->isa = isa;
 437       cl->mach = mach;
 438       cl->endian = endian;
 439       cl->next = cd_list;
 440       cd_list = cl;
 441
 442       @arch@_cgen_init_dis (cd);
 443     }
 444
 445   /* We try to have as much common code as possible.
 446      But at this point some targets need to take over.  */
 447   /* ??? Some targets may need a hook elsewhere.  Try to avoid this,
 448      but if not possible try to move this hook elsewhere rather than
 449      have two hooks.  */
 450   length = CGEN_PRINT_INSN (cd, pc, info);
 451   if (length > 0)
 452     return length;
 453   if (length < 0)
 454     return -1;
 455
 456   (*info->fprintf_func) (info->stream, UNKNOWN_INSN_MSG);
 457   return cd->default_insn_bitsize / 8;
 458 }