opcodes/tic54x-dis.c

   1 /* Disassembly routines for TMS320C54X architecture
   2    Copyright 1999, 2000, 2001 Free Software Foundation, Inc.
   3    Contributed by Timothy Wall (twall@cygnus.com)
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 2 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, write to the Free Software
  17    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  18    02111-1307, USA.  */
  19
  20 #include <errno.h>
  21 #include <math.h>
  22 #include <stdlib.h>
  23 #include "sysdep.h"
  24 #include "dis-asm.h"
  25 #include "opcode/tic54x.h"
  26 #include "coff/tic54x.h"
  27
  28 typedef struct _instruction {
  29   int parallel;
  30   template *tm;
  31   partemplate *ptm;
  32 } instruction;
  33
  34 static int has_lkaddr PARAMS ((unsigned short, template *));
  35 static int get_insn_size PARAMS ((unsigned short, instruction *));
  36 static int get_instruction PARAMS ((disassemble_info *, bfd_vma,
  37                                     unsigned short, instruction *));
  38 static int print_instruction PARAMS ((disassemble_info *, bfd_vma,
  39                                       unsigned short, char *,
  40                                       enum optype [], int, int));
  41 static int print_parallel_instruction PARAMS ((disassemble_info *, bfd_vma,
  42                                                unsigned short, partemplate *,
  43                                                int));
  44 static int sprint_dual_address (disassemble_info *,char [],
  45                                 unsigned short);
  46 static int sprint_indirect_address (disassemble_info *,char [],
  47                                     unsigned short);
  48 static int sprint_direct_address (disassemble_info *,char [],
  49                                   unsigned short);
  50 static int sprint_mmr (disassemble_info *,char [],int);
  51 static int sprint_condition (disassemble_info *,char *,unsigned short);
  52 static int sprint_cc2 (disassemble_info *,char *,unsigned short);
  53
  54 int
  55 print_insn_tic54x (memaddr, info)
  56   bfd_vma memaddr;
  57   disassemble_info *info;
  58 {
  59   bfd_byte opbuf[2];
  60   unsigned short opcode;
  61   int status, size;
  62   instruction insn;
  63
  64   status = (*info->read_memory_func) (memaddr, opbuf, 2, info);
  65   if (status != 0)
  66   {
  67     (*info->memory_error_func) (status, memaddr, info);
  68     return -1;
  69   }
  70
  71   opcode = bfd_getl16 (opbuf);
  72   if (!get_instruction (info, memaddr, opcode, &insn))
  73       return -1;
  74
  75   size = get_insn_size (opcode, &insn);
  76   info->bytes_per_line = 2;
  77   info->bytes_per_chunk = 2;
  78   info->octets_per_byte = 2;
  79   info->display_endian = BFD_ENDIAN_LITTLE;
  80
  81   if (insn.parallel)
  82   {
  83     if (!print_parallel_instruction (info, memaddr, opcode, insn.ptm, size))
  84       return -1;
  85   }
  86   else
  87   {
  88     if (!print_instruction (info, memaddr, opcode,
  89                             (char *) insn.tm->name,
  90                             insn.tm->operand_types,
  91                             size, (insn.tm->flags & FL_EXT)))
  92       return -1;
  93   }
  94
  95   return size * 2;
  96 }
  97
  98 static int
  99 has_lkaddr (opcode, tm)
 100   unsigned short opcode;
 101   template *tm;
 102 {
 103   return (IS_LKADDR (opcode)
 104           && (OPTYPE (tm->operand_types[0]) == OP_Smem
 105               || OPTYPE (tm->operand_types[1]) == OP_Smem
 106               || OPTYPE (tm->operand_types[2]) == OP_Smem
 107               || OPTYPE (tm->operand_types[1]) == OP_Sind));
 108 }
 109
 110 /* always returns 1 (whether an insn template was found) since we provide an
 111    "unknown instruction" template */
 112 static int
 113 get_instruction (info, addr, opcode, insn)
 114   disassemble_info *info;
 115   bfd_vma addr;
 116   unsigned short opcode;
 117   instruction *insn;
 118 {
 119   template * tm;
 120   partemplate * ptm;
 121
 122   insn->parallel = 0;
 123   for (tm = (template *) tic54x_optab; tm->name; tm++)
 124   {
 125     if (tm->opcode == (opcode & tm->mask))
 126     {
 127       /* a few opcodes span two words */
 128       if (tm->flags & FL_EXT)
 129         {
 130           /* if lk addressing is used, the second half of the opcode gets
 131              pushed one word later */
 132           bfd_byte opbuf[2];
 133           bfd_vma addr2 = addr + 1 + has_lkaddr (opcode, tm);
 134           int status = (*info->read_memory_func) (addr2, opbuf, 2, info);
 135           if (status == 0)
 136             {
 137               unsigned short opcode2 = bfd_getl16 (opbuf);
 138               if (tm->opcode2 == (opcode2 & tm->mask2))
 139                 {
 140                   insn->tm = tm;
 141                   return 1;
 142                 }
 143             }
 144         }
 145       else
 146         {
 147           insn->tm = tm;
 148           return 1;
 149         }
 150     }
 151   }
 152   for (ptm = (partemplate *) tic54x_paroptab; ptm->name; ptm++)
 153   {
 154     if (ptm->opcode == (opcode & ptm->mask))
 155     {
 156       insn->parallel = 1;
 157       insn->ptm = ptm;
 158       return 1;
 159     }
 160   }
 161
 162   insn->tm = (template *) &tic54x_unknown_opcode;
 163   return 1;
 164 }
 165
 166 static int
 167 get_insn_size (opcode, insn)
 168   unsigned short opcode;
 169   instruction *insn;
 170 {
 171   int size;
 172
 173   if (insn->parallel)
 174     {
 175       /* only non-parallel instructions support lk addressing */
 176       size = insn->ptm->words;
 177     }
 178   else
 179     {
 180       size = insn->tm->words + has_lkaddr (opcode, insn->tm);
 181     }
 182
 183   return size;
 184 }
 185
 186 int
 187 print_instruction (info, memaddr, opcode, tm_name, tm_operands, size, ext)
 188   disassemble_info *info;
 189   bfd_vma memaddr;
 190   unsigned short opcode;
 191   char *tm_name;
 192   enum optype tm_operands[];
 193   int size;
 194   int ext;
 195 {
 196   static int n;
 197   /* string storage for multiple operands */
 198   char operand[4][64] = { {0},{0},{0},{0}, };
 199   bfd_byte buf[2];
 200   unsigned long opcode2, lkaddr;
 201   enum optype src = OP_None;
 202   enum optype dst = OP_None;
 203   int i, shift;
 204   char *comma = "";
 205
 206   info->fprintf_func (info->stream, "%-7s", tm_name);
 207
 208   if (size > 1)
 209     {
 210       int status = (*info->read_memory_func) (memaddr + 1, buf, 2, info);
 211       if (status != 0)
 212         return 0;
 213       lkaddr = opcode2 = bfd_getl16 (buf);
 214       if (size > 2)
 215         {
 216           status = (*info->read_memory_func) (memaddr + 2, buf, 2, info);
 217           if (status != 0)
 218             return 0;
 219           opcode2 = bfd_getl16 (buf);
 220         }
 221     }
 222
 223   for (i = 0; i < MAX_OPERANDS && OPTYPE (tm_operands[i]) != OP_None; i++)
 224     {
 225       char *next_comma = ",";
 226       int optional = (tm_operands[i] & OPT) != 0;
 227
 228       switch (OPTYPE (tm_operands[i]))
 229         {
 230         case OP_Xmem:
 231           sprint_dual_address (info, operand[i], XMEM (opcode));
 232           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 233           break;
 234         case OP_Ymem:
 235           sprint_dual_address (info, operand[i], YMEM (opcode));
 236           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 237           break;
 238         case OP_Smem:
 239         case OP_Sind:
 240         case OP_Lmem:
 241           info->fprintf_func (info->stream, "%s", comma);
 242           if (INDIRECT (opcode))
 243             {
 244               if (MOD (opcode) >= 12)
 245                 {
 246                   bfd_vma addr = lkaddr;
 247                   int arf = ARF (opcode);
 248                   int mod = MOD (opcode);
 249                   if (mod == 15)
 250                       info->fprintf_func (info->stream, "*(");
 251                   else
 252                       info->fprintf_func (info->stream, "*%sar%d(",
 253                                           (mod == 13 || mod == 14 ? "+" : ""),
 254                                           arf);
 255                   (*(info->print_address_func)) ((bfd_vma) addr, info);
 256                   info->fprintf_func (info->stream, ")%s",
 257                                       mod == 14 ? "%" : "");
 258                 }
 259               else
 260                 {
 261                   sprint_indirect_address (info, operand[i], opcode);
 262                   info->fprintf_func (info->stream, "%s", operand[i]);
 263                 }
 264             }
 265           else
 266           {
 267             /* FIXME -- use labels (print_address_func) */
 268             /* in order to do this, we need to guess what DP is */
 269             sprint_direct_address (info, operand[i], opcode);
 270             info->fprintf_func (info->stream, "%s", operand[i]);
 271           }
 272           break;
 273         case OP_dmad:
 274           info->fprintf_func (info->stream, "%s", comma);
 275           (*(info->print_address_func)) ((bfd_vma) opcode2, info);
 276           break;
 277         case OP_xpmad:
 278           /* upper 7 bits of address are in the opcode */
 279           opcode2 += ((unsigned long) opcode & 0x7F) << 16;
 280           /* fall through */
 281         case OP_pmad:
 282           info->fprintf_func (info->stream, "%s", comma);
 283           (*(info->print_address_func)) ((bfd_vma) opcode2, info);
 284           break;
 285         case OP_MMRX:
 286           sprint_mmr (info, operand[i], MMRX (opcode));
 287           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 288           break;
 289         case OP_MMRY:
 290           sprint_mmr (info, operand[i], MMRY (opcode));
 291           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 292           break;
 293         case OP_MMR:
 294           sprint_mmr (info, operand[i], MMR (opcode));
 295           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 296           break;
 297         case OP_PA:
 298           sprintf (operand[i], "pa%d", (unsigned) opcode2);
 299           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 300           break;
 301         case OP_SRC:
 302           src = SRC (ext ? opcode2 : opcode) ? OP_B : OP_A;
 303           sprintf (operand[i], (src == OP_B) ? "b" : "a");
 304           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 305           break;
 306         case OP_SRC1:
 307           src = SRC1 (ext ? opcode2 : opcode) ? OP_B : OP_A;
 308           sprintf (operand[i], (src == OP_B) ? "b" : "a");
 309           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 310           break;
 311         case OP_RND:
 312           dst = DST (opcode) ? OP_B : OP_A;
 313           sprintf (operand[i], (dst == OP_B) ? "a" : "b");
 314           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 315           break;
 316         case OP_DST:
 317           dst = DST (ext ? opcode2 : opcode) ? OP_B : OP_A;
 318           if (!optional || dst != src)
 319             {
 320               sprintf (operand[i], (dst == OP_B) ? "b" : "a");
 321               info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 322             }
 323           else
 324             next_comma = comma;
 325           break;
 326         case OP_B:
 327           sprintf (operand[i], "b");
 328           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 329           break;
 330         case OP_A:
 331           sprintf (operand[i], "a");
 332           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 333           break;
 334         case OP_ARX:
 335           sprintf (operand[i], "ar%d", (int) ARX (opcode));
 336           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 337           break;
 338         case OP_SHIFT:
 339           shift = SHIFT (ext ? opcode2 : opcode);
 340           if (!optional || shift != 0)
 341             {
 342               sprintf (operand[i], "%d", shift);
 343               info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 344             }
 345           else
 346             next_comma = comma;
 347           break;
 348         case OP_SHFT:
 349           shift = SHFT (opcode);
 350           if (!optional || shift != 0)
 351             {
 352               sprintf (operand[i], "%d", (unsigned) shift);
 353               info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 354             }
 355           else
 356             next_comma = comma;
 357           break;
 358         case OP_lk:
 359           sprintf (operand[i], "#%d", (int) (short) opcode2);
 360           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 361           break;
 362         case OP_T:
 363           sprintf (operand[i], "t");
 364           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 365           break;
 366         case OP_TS:
 367           sprintf (operand[i], "ts");
 368           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 369           break;
 370         case OP_k8:
 371           sprintf (operand[i], "%d", (int) ((signed char) (opcode & 0xFF)));
 372           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 373           break;
 374         case OP_16:
 375           sprintf (operand[i], "16");
 376           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 377           break;
 378         case OP_ASM:
 379           sprintf (operand[i], "asm");
 380           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 381           break;
 382         case OP_BITC:
 383           sprintf (operand[i], "%d", (int) (opcode & 0xF));
 384           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 385           break;
 386         case OP_CC:
 387           /* put all CC operands in the same operand */
 388           sprint_condition (info, operand[i], opcode);
 389           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 390           i = MAX_OPERANDS;
 391           break;
 392         case OP_CC2:
 393           sprint_cc2 (info, operand[i], opcode);
 394           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 395           break;
 396         case OP_CC3:
 397         {
 398           const char *code[] = { "eq", "lt", "gt", "neq" };
 399           sprintf (operand[i], code[CC3 (opcode)]);
 400           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 401           break;
 402         }
 403         case OP_123:
 404           {
 405             int code = (opcode >> 8) & 0x3;
 406             sprintf (operand[i], "%d", (code == 0) ? 1 : (code == 2) ? 2 : 3);
 407             info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 408             break;
 409           }
 410         case OP_k5:
 411           sprintf (operand[i], "#%d",
 412                    (int) (((signed char) opcode & 0x1F) << 3) >> 3);
 413           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 414           break;
 415         case OP_k8u:
 416           sprintf (operand[i], "#%d", (unsigned) (opcode & 0xFF));
 417           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 418           break;
 419         case OP_k3:
 420           sprintf (operand[i], "#%d", (int) (opcode & 0x7));
 421           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 422           break;
 423         case OP_lku:
 424           sprintf (operand[i], "#%d", (unsigned) opcode2);
 425           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 426           break;
 427         case OP_N:
 428           n = (opcode >> 9) & 0x1;
 429           sprintf (operand[i], "st%d", n);
 430           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 431           break;
 432         case OP_SBIT:
 433         {
 434           const char *status0[] = {
 435             "0", "1", "2", "3", "4", "5", "6", "7", "8",
 436             "ovb", "ova", "c", "tc", "13", "14", "15"
 437           };
 438           const char *status1[] = {
 439             "0", "1", "2", "3", "4",
 440             "cmpt", "frct", "c16", "sxm", "ovm", "10",
 441             "intm", "hm", "xf", "cpl", "braf"
 442           };
 443           sprintf (operand[i], "%s",
 444                    n ? status1[SBIT (opcode)] : status0[SBIT (opcode)]);
 445           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 446           break;
 447         }
 448         case OP_12:
 449           sprintf (operand[i], "%d", (int) ((opcode >> 9) & 1) + 1);
 450           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 451           break;
 452         case OP_TRN:
 453           sprintf (operand[i], "trn");
 454           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 455           break;
 456         case OP_DP:
 457           sprintf (operand[i], "dp");
 458           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 459           break;
 460         case OP_k9:
 461           /* FIXME-- this is DP, print the original address? */
 462           sprintf (operand[i], "#%d", (int) (opcode & 0x1FF));
 463           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 464           break;
 465         case OP_ARP:
 466           sprintf (operand[i], "arp");
 467           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 468           break;
 469         case OP_031:
 470           sprintf (operand[i], "%d", (int) (opcode & 0x1F));
 471           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 472           break;
 473         default:
 474           sprintf (operand[i], "??? (0x%x)", tm_operands[i]);
 475           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 476           break;
 477         }
 478       comma = next_comma;
 479     }
 480   return 1;
 481 }
 482
 483 static int
 484 print_parallel_instruction (info, memaddr, opcode, ptm, size)
 485   disassemble_info *info;
 486   bfd_vma memaddr;
 487   unsigned short opcode;
 488   partemplate *ptm;
 489   int size;
 490 {
 491   print_instruction (info, memaddr, opcode,
 492                      ptm->name, ptm->operand_types, size, 0);
 493   info->fprintf_func (info->stream, " || ");
 494   return print_instruction (info, memaddr, opcode,
 495                             ptm->parname, ptm->paroperand_types, size, 0);
 496 }
 497
 498 static int
 499 sprint_dual_address (info, buf, code)
 500   disassemble_info *info ATTRIBUTE_UNUSED;
 501   char buf[];
 502   unsigned short code;
 503 {
 504   const char *formats[] = {
 505     "*ar%d",
 506     "*ar%d-",
 507     "*ar%d+",
 508     "*ar%d+0%%",
 509   };
 510   return sprintf (buf, formats[XMOD (code)], XARX (code));
 511 }
 512
 513 static int
 514 sprint_indirect_address (info, buf, opcode)
 515   disassemble_info *info ATTRIBUTE_UNUSED;
 516   char buf[];
 517   unsigned short opcode;
 518 {
 519   const char *formats[] = {
 520     "*ar%d",
 521     "*ar%d-",
 522     "*ar%d+",
 523     "*+ar%d",
 524     "*ar%d-0B",
 525     "*ar%d-0",
 526     "*ar%d+0",
 527     "*ar%d+0B",
 528     "*ar%d-%%",
 529     "*ar%d-0%%",
 530     "*ar%d+%%",
 531     "*ar%d+0%%",
 532   };
 533   return sprintf (buf, formats[MOD (opcode)], ARF (opcode));
 534 }
 535
 536 static int
 537 sprint_direct_address (info, buf, opcode)
 538   disassemble_info *info ATTRIBUTE_UNUSED;
 539   char buf[];
 540   unsigned short opcode;
 541 {
 542   /* FIXME -- look up relocation if available */
 543   return sprintf (buf, "0x??%02x", (int) (opcode & 0x7F));
 544 }
 545
 546 static int
 547 sprint_mmr (info, buf, mmr)
 548   disassemble_info *info ATTRIBUTE_UNUSED;
 549   char buf[];
 550   int mmr;
 551 {
 552   symbol *reg = (symbol *) mmregs;
 553   while (reg->name != NULL)
 554     {
 555       if (mmr == reg->value)
 556         {
 557           sprintf (buf, "%s", (reg + 1)->name);
 558           return 1;
 559         }
 560       ++reg;
 561     }
 562   sprintf (buf, "MMR(%d)", mmr); /* FIXME -- different targets.  */
 563   return 0;
 564 }
 565
 566 static int
 567 sprint_cc2 (info, buf, opcode)
 568   disassemble_info *info ATTRIBUTE_UNUSED;
 569   char *buf;
 570   unsigned short opcode;
 571 {
 572   const char *cc2[] = {
 573     "??", "??", "ageq", "alt", "aneq", "aeq", "agt", "aleq",
 574     "??", "??", "bgeq", "blt", "bneq", "beq", "bgt", "bleq",
 575   };
 576   return sprintf (buf, "%s", cc2[opcode & 0xF]);
 577 }
 578
 579 static int
 580 sprint_condition (info, buf, opcode)
 581   disassemble_info *info ATTRIBUTE_UNUSED;
 582   char *buf;
 583   unsigned short opcode;
 584 {
 585   char *start = buf;
 586   const char *cmp[] = {
 587       "??", "??", "geq", "lt", "neq", "eq", "gt", "leq"
 588   };
 589   if (opcode & 0x40)
 590     {
 591       char acc = (opcode & 0x8) ? 'b' : 'a';
 592       if (opcode & 0x7)
 593           buf += sprintf (buf, "%c%s%s", acc, cmp[(opcode & 0x7)],
 594                           (opcode & 0x20) ? ", " : "");
 595       if (opcode & 0x20)
 596           buf += sprintf (buf, "%c%s", acc, (opcode & 0x10) ? "ov" : "nov");
 597     }
 598   else if (opcode & 0x3F)
 599     {
 600       if (opcode & 0x30)
 601         buf += sprintf (buf, "%s%s",
 602                         ((opcode & 0x30) == 0x30) ? "tc" : "ntc",
 603                         (opcode & 0x0F) ? ", " : "");
 604       if (opcode & 0x0C)
 605         buf += sprintf (buf, "%s%s",
 606                         ((opcode & 0x0C) == 0x0C) ? "c" : "nc",
 607                         (opcode & 0x03) ? ", " : "");
 608       if (opcode & 0x03)
 609         buf += sprintf (buf, "%s",
 610                         ((opcode & 0x03) == 0x03) ? "bio" : "nbio");
 611     }
 612   else
 613     buf += sprintf (buf, "unc");
 614
 615   return buf - start;
 616 }