opcodes/score-dis.c

   1 /* Instruction printing code for Score
   2    Copyright 2006 Free Software Foundation, Inc.
   3    Contributed by:
   4    Mei Ligang (ligang@sunnorth.com.cn)
   5    Pei-Lin Tsai (pltsai@sunplus.com)
   6
   7    This file is part of libopcodes.
   8
   9    This program is free software; you can redistribute it and/or modify it under
  10    the terms of the GNU General Public License as published by the Free
  11    Software Foundation; either version 2 of the License, or (at your option)
  12    any later version.
  13
  14    This program is distributed in the hope that it will be useful, but WITHOUT
  15    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  17    more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
  22    02110-1301, USA.  */
  23
  24 #include "sysdep.h"
  25 #include "dis-asm.h"
  26 #define DEFINE_TABLE
  27 #include "score-opc.h"
  28 #include "opintl.h"
  29 #include "bfd.h"
  30
  31 /* FIXME: This shouldn't be done here.  */
  32 #include "elf-bfd.h"
  33 #include "elf/internal.h"
  34 #include "elf/score.h"
  35
  36 #ifndef streq
  37 #define streq(a,b)      (strcmp ((a), (b)) == 0)
  38 #endif
  39
  40 #ifndef strneq
  41 #define strneq(a,b,n)   (strncmp ((a), (b), (n)) == 0)
  42 #endif
  43
  44 #ifndef NUM_ELEM
  45 #define NUM_ELEM(a)     (sizeof (a) / sizeof (a)[0])
  46 #endif
  47
  48 typedef struct
  49 {
  50   const char *name;
  51   const char *description;
  52   const char *reg_names[32];
  53 } score_regname;
  54
  55 static score_regname regnames[] =
  56 {
  57   {"gcc", "Select register names used by GCC",
  58   {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10",
  59    "r11", "r12", "r13", "r14", "r15", "r16", "r17", "r18", "r19", "r20",
  60    "r21", "r22", "r23", "r24", "r25", "r26", "r27", "gp", "r29", "r30", "r31"}},
  61 };
  62
  63 static unsigned int regname_selected = 0;
  64
  65 #define NUM_SCORE_REGNAMES  NUM_ELEM (regnames)
  66 #define score_regnames      regnames[regname_selected].reg_names
  67
  68 /* Print one instruction from PC on INFO->STREAM.
  69    Return the size of the instruction.  */
  70 static int
  71 print_insn_score32 (bfd_vma pc, struct disassemble_info *info, long given)
  72 {
  73   struct score_opcode *insn;
  74   void *stream = info->stream;
  75   fprintf_ftype func = info->fprintf_func;
  76
  77   for (insn = score_opcodes; insn->assembler; insn++)
  78     {
  79       if ((insn->mask & 0xffff0000) && (given & insn->mask) == insn->value)
  80         {
  81           char *c;
  82
  83           for (c = insn->assembler; *c; c++)
  84             {
  85               if (*c == '%')
  86                 {
  87                   switch (*++c)
  88                     {
  89                     case 'j':
  90                       {
  91                         int target;
  92
  93                         if (info->flags & INSN_HAS_RELOC)
  94                           pc = 0;
  95                         target = (pc & 0xfe000000) | (given & 0x01fffffe);
  96                         (*info->print_address_func) (target, info);
  97                       }
  98                       break;
  99                     case 'b':
 100                       {
 101                         /* Sign-extend a 20-bit number.  */
 102 #define SEXT20(x)       ((((x) & 0xfffff) ^ (~ 0x7ffff)) + 0x80000)
 103                         int disp = ((given & 0x01ff8000) >> 5) | (given & 0x3fe);
 104                         int target = (pc + SEXT20 (disp));
 105
 106                         (*info->print_address_func) (target, info);
 107                       }
 108                       break;
 109                     case '0':
 110                     case '1':
 111                     case '2':
 112                     case '3':
 113                     case '4':
 114                     case '5':
 115                     case '6':
 116                     case '7':
 117                     case '8':
 118                     case '9':
 119                       {
 120                         int bitstart = *c++ - '0';
 121                         int bitend = 0;
 122
 123                         while (*c >= '0' && *c <= '9')
 124                           bitstart = (bitstart * 10) + *c++ - '0';
 125
 126                         switch (*c)
 127                           {
 128                           case '-':
 129                             c++;
 130                             while (*c >= '0' && *c <= '9')
 131                               bitend = (bitend * 10) + *c++ - '0';
 132
 133                             if (!bitend)
 134                               abort ();
 135
 136                             switch (*c)
 137                               {
 138                               case 'r':
 139                                 {
 140                                   long reg;
 141
 142                                   reg = given >> bitstart;
 143                                   reg &= (2 << (bitend - bitstart)) - 1;
 144
 145                                   func (stream, "%s", score_regnames[reg]);
 146                                 }
 147                                 break;
 148                               case 'd':
 149                                 {
 150                                   long reg;
 151
 152                                   reg = given >> bitstart;
 153                                   reg &= (2 << (bitend - bitstart)) - 1;
 154
 155                                   func (stream, "%ld", reg);
 156                                 }
 157                                 break;
 158                               case 'i':
 159                                 {
 160                                   long reg;
 161
 162                                   reg = given >> bitstart;
 163                                   reg &= (2 << (bitend - bitstart)) - 1;
 164                                   reg = ((reg ^ (1 << (bitend - bitstart))) -
 165                                         (1 << (bitend - bitstart)));
 166
 167                                   if (((given & insn->mask) == 0x0c00000a)      /* ldc1  */
 168                                       || ((given & insn->mask) == 0x0c000012)   /* ldc2  */
 169                                       || ((given & insn->mask) == 0x0c00001c)   /* ldc3  */
 170                                       || ((given & insn->mask) == 0x0c00000b)   /* stc1  */
 171                                       || ((given & insn->mask) == 0x0c000013)   /* stc2  */
 172                                       || ((given & insn->mask) == 0x0c00001b))  /* stc3  */
 173                                     reg <<= 2;
 174
 175                                   func (stream, "%ld", reg);
 176                                 }
 177                                 break;
 178                               case 'x':
 179                                 {
 180                                   long reg;
 181
 182                                   reg = given >> bitstart;
 183                                   reg &= (2 << (bitend - bitstart)) - 1;
 184
 185                                   func (stream, "%lx", reg);
 186                                 }
 187                                 break;
 188                               default:
 189                                 abort ();
 190                               }
 191                             break;
 192                           case '`':
 193                             c++;
 194                             if ((given & (1 << bitstart)) == 0)
 195                               func (stream, "%c", *c);
 196                             break;
 197                           case '\'':
 198                             c++;
 199                             if ((given & (1 << bitstart)) != 0)
 200                               func (stream, "%c", *c);
 201                             break;
 202                           default:
 203                             abort ();
 204                           }
 205                         break;
 206
 207                     default:
 208                         abort ();
 209                       }
 210                     }
 211                 }
 212               else
 213                 func (stream, "%c", *c);
 214             }
 215           return 4;
 216         }
 217     }
 218
 219 #if (SCORE_SIMULATOR_ACTIVE)
 220   func (stream, _("<illegal instruction>"));
 221   return 4;
 222 #endif
 223
 224   abort ();
 225 }
 226
 227 static void
 228 print_insn_parallel_sym (struct disassemble_info *info)
 229 {
 230   void *stream = info->stream;
 231   fprintf_ftype func = info->fprintf_func;
 232
 233   /* 10:       0000            nop!
 234      4 space + 1 colon + 1 space + 1 tab + 8 opcode + 2 space + 1 tab.
 235      FIXME: the space number is not accurate.  */
 236   func (stream, "%s", " ||\n      \t          \t");
 237 }
 238
 239 /* Print one instruction from PC on INFO->STREAM.
 240    Return the size of the instruction.  */
 241 static int
 242 print_insn_score16 (bfd_vma pc, struct disassemble_info *info, long given)
 243 {
 244   struct score_opcode *insn;
 245   void *stream = info->stream;
 246   fprintf_ftype func = info->fprintf_func;
 247
 248   given &= 0xffff;
 249   for (insn = score_opcodes; insn->assembler; insn++)
 250     {
 251       if (!(insn->mask & 0xffff0000) && (given & insn->mask) == insn->value)
 252         {
 253           char *c = insn->assembler;
 254
 255           info->bytes_per_chunk = 2;
 256           info->bytes_per_line = 4;
 257           given &= 0xffff;
 258
 259           for (; *c; c++)
 260             {
 261               if (*c == '%')
 262                 {
 263                   switch (*++c)
 264                     {
 265
 266                     case 'j':
 267                       {
 268                         int target;
 269
 270                         if (info->flags & INSN_HAS_RELOC)
 271                           pc = 0;
 272
 273                         target = (pc & 0xfffff000) | (given & 0x00000ffe);
 274                         (*info->print_address_func) (target, info);
 275                       }
 276                       break;
 277                     case 'b':
 278                       {
 279                         /* Sign-extend a 9-bit number.  */
 280 #define SEXT9(x)           ((((x) & 0x1ff) ^ (~ 0xff)) + 0x100)
 281                         int disp = (given & 0xff) << 1;
 282                         int target = (pc + SEXT9 (disp));
 283
 284                         (*info->print_address_func) (target, info);
 285                       }
 286                       break;
 287
 288                     case '0':
 289                     case '1':
 290                     case '2':
 291                     case '3':
 292                     case '4':
 293                     case '5':
 294                     case '6':
 295                     case '7':
 296                     case '8':
 297                     case '9':
 298                       {
 299                         int bitstart = *c++ - '0';
 300                         int bitend = 0;
 301
 302                         while (*c >= '0' && *c <= '9')
 303                           bitstart = (bitstart * 10) + *c++ - '0';
 304
 305                         switch (*c)
 306                           {
 307                           case '-':
 308                             {
 309                               long reg;
 310
 311                               c++;
 312                               while (*c >= '0' && *c <= '9')
 313                                 bitend = (bitend * 10) + *c++ - '0';
 314                               if (!bitend)
 315                                 abort ();
 316                               reg = given >> bitstart;
 317                               reg &= (2 << (bitend - bitstart)) - 1;
 318                               switch (*c)
 319                                 {
 320                                 case 'R':
 321                                   func (stream, "%s", score_regnames[reg + 16]);
 322                                   break;
 323                                 case 'r':
 324                                   func (stream, "%s", score_regnames[reg]);
 325                                   break;
 326                                 case 'd':
 327                                   if (*(c + 1) == '\0')
 328                                     func (stream, "%ld", reg);
 329                                   else
 330                                     {
 331                                       c++;
 332                                       if (*c == '1')
 333                                         func (stream, "%ld", reg << 1);
 334                                       else if (*c == '2')
 335                                         func (stream, "%ld", reg << 2);
 336                                     }
 337                                   break;
 338
 339                                 case 'x':
 340                                   if (*(c + 1) == '\0')
 341                                     func (stream, "%lx", reg);
 342                                   else
 343                                     {
 344                                       c++;
 345                                       if (*c == '1')
 346                                         func (stream, "%lx", reg << 1);
 347                                       else if (*c == '2')
 348                                         func (stream, "%lx", reg << 2);
 349                                     }
 350                                   break;
 351                                 case 'i':
 352                                   reg = ((reg ^ (1 << bitend)) - (1 << bitend));
 353                                   func (stream, "%ld", reg);
 354                                   break;
 355                                 default:
 356                                   abort ();
 357                                 }
 358                             }
 359                             break;
 360
 361                           case '\'':
 362                             c++;
 363                             if ((given & (1 << bitstart)) != 0)
 364                               func (stream, "%c", *c);
 365                             break;
 366                           default:
 367                             abort ();
 368                           }
 369                       }
 370                       break;
 371                     default:
 372                       abort ();
 373                     }
 374                 }
 375               else
 376                 func (stream, "%c", *c);
 377             }
 378
 379           return 2;
 380         }
 381     }
 382 #if (SCORE_SIMULATOR_ACTIVE)
 383   func (stream, _("<illegal instruction>"));
 384   return 2;
 385 #endif
 386   /* No match.  */
 387   abort ();
 388 }
 389
 390 /* NOTE: There are no checks in these routines that
 391    the relevant number of data bytes exist.  */
 392 static int
 393 print_insn (bfd_vma pc, struct disassemble_info *info, bfd_boolean little)
 394 {
 395   unsigned char b[4];
 396   long given;
 397   long ridparity;
 398   int status;
 399   bfd_boolean insn_pce_p = FALSE;
 400   bfd_boolean insn_16_p = FALSE;
 401
 402   info->display_endian = little ? BFD_ENDIAN_LITTLE : BFD_ENDIAN_BIG;
 403
 404   if (pc & 0x2)
 405     {
 406       info->bytes_per_chunk = 2;
 407       status = info->read_memory_func (pc, (bfd_byte *) b, 2, info);
 408       b[3] = b[2] = 0;
 409       insn_16_p = TRUE;
 410     }
 411   else
 412     {
 413       info->bytes_per_chunk = 4;
 414       status = info->read_memory_func (pc, (bfd_byte *) & b[0], 4, info);
 415       if (status != 0)
 416         {
 417           info->bytes_per_chunk = 2;
 418           status = info->read_memory_func (pc, (bfd_byte *) b, 2, info);
 419           b[3] = b[2] = 0;
 420           insn_16_p = TRUE;
 421         }
 422     }
 423
 424   if (status != 0)
 425     {
 426       info->memory_error_func (status, pc, info);
 427       return -1;
 428     }
 429
 430   if (little)
 431     {
 432       given = (b[0]) | (b[1] << 8) | (b[2] << 16) | (b[3] << 24);
 433     }
 434   else
 435     {
 436       given = (b[0] << 24) | (b[1] << 16) | (b[2] << 8) | (b[3]);
 437     }
 438
 439   if ((given & 0x80008000) == 0x80008000)
 440     {
 441       insn_pce_p = FALSE;
 442       insn_16_p = FALSE;
 443     }
 444   else if ((given & 0x8000) == 0x8000)
 445     {
 446       insn_pce_p = TRUE;
 447     }
 448   else
 449     {
 450       insn_16_p = TRUE;
 451     }
 452
 453   /* 16 bit instruction.  */
 454   if (insn_16_p)
 455     {
 456       if (little)
 457         {
 458           given = b[0] | (b[1] << 8);
 459         }
 460       else
 461         {
 462           given = (b[0] << 8) | b[1];
 463         }
 464
 465       status = print_insn_score16 (pc, info, given);
 466     }
 467   /* pce instruction.  */
 468   else if (insn_pce_p)
 469     {
 470       long other;
 471
 472       given = (given & 0xFFFF0000) >> 16;
 473       other = given & 0xFFFF;
 474
 475       status = print_insn_score16 (pc, info, given);
 476       print_insn_parallel_sym (info);
 477       status += print_insn_score16 (pc, info, other);
 478       /* disassemble_bytes() will output 4 byte per chunk for pce instructio.  */
 479       info->bytes_per_chunk = 4;
 480     }
 481   /* 32 bit instruction.  */
 482   else
 483     {
 484       /* Get rid of parity.  */
 485       ridparity = (given & 0x7FFF);
 486       ridparity |= (given & 0x7FFF0000) >> 1;
 487       given = ridparity;
 488       status = print_insn_score32 (pc, info, given);
 489     }
 490
 491   return status;
 492 }
 493
 494 int
 495 print_insn_big_score (bfd_vma pc, struct disassemble_info *info)
 496 {
 497   return print_insn (pc, info, FALSE);
 498 }
 499
 500 int
 501 print_insn_little_score (bfd_vma pc, struct disassemble_info *info)
 502 {
 503   return print_insn (pc, info, TRUE);
 504 }