opcodes/tic54x-dis.c

   1 /* Disassembly routines for TMS320C54X architecture
   2    Copyright (C) 1999-2021 Free Software Foundation, Inc.
   3    Contributed by Timothy Wall (twall@cygnus.com)
   4
   5    This file is part of the GNU opcodes library.
   6
   7    This library is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3, or (at your option)
  10    any later version.
  11
  12    It is distributed in the hope that it will be useful, but WITHOUT
  13    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  15    License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this file; see the file COPYING.  If not, write to the
  19    Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston,
  20    MA 02110-1301, USA.  */
  21
  22 #include "sysdep.h"
  23 #include <errno.h>
  24 #include <math.h>
  25 #include <stdlib.h>
  26 #include "disassemble.h"
  27 #include "opcode/tic54x.h"
  28 #include "coff/tic54x.h"
  29
  30 static int has_lkaddr (unsigned short, const insn_template *);
  31 static int get_insn_size (unsigned short, const insn_template *);
  32 static int print_instruction (disassemble_info *, bfd_vma,
  33                               unsigned short, const char *,
  34                               const enum optype [], int, int);
  35 static int print_parallel_instruction (disassemble_info *, bfd_vma,
  36                                        unsigned short,
  37                                        const insn_template *, int);
  38 static int sprint_dual_address (disassemble_info *,char [],
  39                                 unsigned short);
  40 static int sprint_indirect_address (disassemble_info *,char [],
  41                                     unsigned short);
  42 static int sprint_direct_address (disassemble_info *,char [],
  43                                   unsigned short);
  44 static int sprint_mmr (disassemble_info *,char [],int);
  45 static int sprint_condition (disassemble_info *,char *,unsigned short);
  46 static int sprint_cc2 (disassemble_info *,char *,unsigned short);
  47
  48 int
  49 print_insn_tic54x (bfd_vma memaddr, disassemble_info *info)
  50 {
  51   bfd_byte opbuf[2];
  52   unsigned short opcode;
  53   int status, size;
  54   const insn_template* tm;
  55
  56   status = (*info->read_memory_func) (memaddr, opbuf, 2, info);
  57   if (status != 0)
  58   {
  59     (*info->memory_error_func) (status, memaddr, info);
  60     return -1;
  61   }
  62
  63   opcode = bfd_getl16 (opbuf);
  64   tm = tic54x_get_insn (info, memaddr, opcode, &size);
  65
  66   info->bytes_per_line = 2;
  67   info->bytes_per_chunk = 2;
  68   info->octets_per_byte = 2;
  69   info->display_endian = BFD_ENDIAN_LITTLE;
  70
  71   if (tm->flags & FL_PAR)
  72   {
  73     if (!print_parallel_instruction (info, memaddr, opcode, tm, size))
  74       return -1;
  75   }
  76   else
  77   {
  78     if (!print_instruction (info, memaddr, opcode,
  79                             (char *) tm->name,
  80                             tm->operand_types,
  81                             size, (tm->flags & FL_EXT)))
  82       return -1;
  83   }
  84
  85   return size * 2;
  86 }
  87
  88 static int
  89 has_lkaddr (unsigned short memdata, const insn_template *tm)
  90 {
  91   return (IS_LKADDR (memdata)
  92           && (OPTYPE (tm->operand_types[0]) == OP_Smem
  93               || OPTYPE (tm->operand_types[1]) == OP_Smem
  94               || OPTYPE (tm->operand_types[2]) == OP_Smem
  95               || OPTYPE (tm->operand_types[1]) == OP_Sind
  96               || OPTYPE (tm->operand_types[0]) == OP_Lmem
  97               || OPTYPE (tm->operand_types[1]) == OP_Lmem));
  98 }
  99
 100 /* always returns 1 (whether an insn template was found) since we provide an
 101    "unknown instruction" template */
 102 const insn_template*
 103 tic54x_get_insn (disassemble_info *info, bfd_vma addr,
 104                  unsigned short memdata, int *size)
 105 {
 106   const insn_template *tm = NULL;
 107
 108   for (tm = tic54x_optab; tm->name; tm++)
 109   {
 110     if (tm->opcode == (memdata & tm->mask))
 111     {
 112       /* a few opcodes span two words */
 113       if (tm->flags & FL_EXT)
 114         {
 115           /* if lk addressing is used, the second half of the opcode gets
 116              pushed one word later */
 117           bfd_byte opbuf[2];
 118           bfd_vma addr2 = addr + 1 + has_lkaddr (memdata, tm);
 119           int status = (*info->read_memory_func) (addr2, opbuf, 2, info);
 120           /* FIXME handle errors.  */
 121           if (status == 0)
 122             {
 123               unsigned short data2 = bfd_getl16 (opbuf);
 124               if (tm->opcode2 == (data2 & tm->mask2))
 125                 {
 126                   if (size) *size = get_insn_size (memdata, tm);
 127                   return tm;
 128                 }
 129             }
 130         }
 131       else
 132         {
 133           if (size) *size = get_insn_size (memdata, tm);
 134           return tm;
 135         }
 136     }
 137   }
 138   for (tm = (insn_template *) tic54x_paroptab; tm->name; tm++)
 139   {
 140     if (tm->opcode == (memdata & tm->mask))
 141     {
 142       if (size) *size = get_insn_size (memdata, tm);
 143       return tm;
 144     }
 145   }
 146
 147   if (size) *size = 1;
 148   return &tic54x_unknown_opcode;
 149 }
 150
 151 static int
 152 get_insn_size (unsigned short memdata, const insn_template *insn)
 153 {
 154   int size;
 155
 156   if (insn->flags & FL_PAR)
 157     {
 158       /* only non-parallel instructions support lk addressing */
 159       size = insn->words;
 160     }
 161   else
 162     {
 163       size = insn->words + has_lkaddr (memdata, insn);
 164     }
 165
 166   return size;
 167 }
 168
 169 int
 170 print_instruction (disassemble_info *info,
 171                    bfd_vma memaddr,
 172                    unsigned short opcode,
 173                    const char *tm_name,
 174                    const enum optype tm_operands[],
 175                    int size,
 176                    int ext)
 177 {
 178   static int n;
 179   /* string storage for multiple operands */
 180   char operand[4][64] = { {0},{0},{0},{0}, };
 181   bfd_byte buf[2];
 182   unsigned long opcode2 = 0;
 183   unsigned long lkaddr = 0;
 184   enum optype src = OP_None;
 185   enum optype dst = OP_None;
 186   int i, shift;
 187   char *comma = "";
 188
 189   info->fprintf_func (info->stream, "%-7s", tm_name);
 190
 191   if (size > 1)
 192     {
 193       int status = (*info->read_memory_func) (memaddr + 1, buf, 2, info);
 194       if (status != 0)
 195         return 0;
 196       lkaddr = opcode2 = bfd_getl16 (buf);
 197       if (size > 2)
 198         {
 199           status = (*info->read_memory_func) (memaddr + 2, buf, 2, info);
 200           if (status != 0)
 201             return 0;
 202           opcode2 = bfd_getl16 (buf);
 203         }
 204     }
 205
 206   for (i = 0; i < MAX_OPERANDS && OPTYPE (tm_operands[i]) != OP_None; i++)
 207     {
 208       char *next_comma = ",";
 209       int optional = (tm_operands[i] & OPT) != 0;
 210
 211       switch (OPTYPE (tm_operands[i]))
 212         {
 213         case OP_Xmem:
 214           sprint_dual_address (info, operand[i], XMEM (opcode));
 215           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 216           break;
 217         case OP_Ymem:
 218           sprint_dual_address (info, operand[i], YMEM (opcode));
 219           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 220           break;
 221         case OP_Smem:
 222         case OP_Sind:
 223         case OP_Lmem:
 224           info->fprintf_func (info->stream, "%s", comma);
 225           if (INDIRECT (opcode))
 226             {
 227               if (MOD (opcode) >= 12)
 228                 {
 229                   bfd_vma addr = lkaddr;
 230                   int arf = ARF (opcode);
 231                   int mod = MOD (opcode);
 232                   if (mod == 15)
 233                       info->fprintf_func (info->stream, "*(");
 234                   else
 235                       info->fprintf_func (info->stream, "*%sar%d(",
 236                                           (mod == 13 || mod == 14 ? "+" : ""),
 237                                           arf);
 238                   (*(info->print_address_func)) ((bfd_vma) addr, info);
 239                   info->fprintf_func (info->stream, ")%s",
 240                                       mod == 14 ? "%" : "");
 241                 }
 242               else
 243                 {
 244                   sprint_indirect_address (info, operand[i], opcode);
 245                   info->fprintf_func (info->stream, "%s", operand[i]);
 246                 }
 247             }
 248           else
 249           {
 250             /* FIXME -- use labels (print_address_func) */
 251             /* in order to do this, we need to guess what DP is */
 252             sprint_direct_address (info, operand[i], opcode);
 253             info->fprintf_func (info->stream, "%s", operand[i]);
 254           }
 255           break;
 256         case OP_dmad:
 257           info->fprintf_func (info->stream, "%s", comma);
 258           (*(info->print_address_func)) ((bfd_vma) opcode2, info);
 259           break;
 260         case OP_xpmad:
 261           /* upper 7 bits of address are in the opcode */
 262           opcode2 += ((unsigned long) opcode & 0x7F) << 16;
 263           /* fall through */
 264         case OP_pmad:
 265           info->fprintf_func (info->stream, "%s", comma);
 266           (*(info->print_address_func)) ((bfd_vma) opcode2, info);
 267           break;
 268         case OP_MMRX:
 269           sprint_mmr (info, operand[i], MMRX (opcode));
 270           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 271           break;
 272         case OP_MMRY:
 273           sprint_mmr (info, operand[i], MMRY (opcode));
 274           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 275           break;
 276         case OP_MMR:
 277           sprint_mmr (info, operand[i], MMR (opcode));
 278           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 279           break;
 280         case OP_PA:
 281           sprintf (operand[i], "pa%d", (unsigned) opcode2);
 282           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 283           break;
 284         case OP_SRC:
 285           src = SRC (ext ? opcode2 : opcode) ? OP_B : OP_A;
 286           sprintf (operand[i], (src == OP_B) ? "b" : "a");
 287           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 288           break;
 289         case OP_SRC1:
 290           src = SRC1 (ext ? opcode2 : opcode) ? OP_B : OP_A;
 291           sprintf (operand[i], (src == OP_B) ? "b" : "a");
 292           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 293           break;
 294         case OP_RND:
 295           dst = DST (opcode) ? OP_B : OP_A;
 296           sprintf (operand[i], (dst == OP_B) ? "a" : "b");
 297           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 298           break;
 299         case OP_DST:
 300           dst = DST (ext ? opcode2 : opcode) ? OP_B : OP_A;
 301           if (!optional || dst != src)
 302             {
 303               sprintf (operand[i], (dst == OP_B) ? "b" : "a");
 304               info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 305             }
 306           else
 307             next_comma = comma;
 308           break;
 309         case OP_B:
 310           sprintf (operand[i], "b");
 311           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 312           break;
 313         case OP_A:
 314           sprintf (operand[i], "a");
 315           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 316           break;
 317         case OP_ARX:
 318           sprintf (operand[i], "ar%d", (int) ARX (opcode));
 319           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 320           break;
 321         case OP_SHIFT:
 322           shift = SHIFT (ext ? opcode2 : opcode);
 323           if (!optional || shift != 0)
 324             {
 325               sprintf (operand[i], "%d", shift);
 326               info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 327             }
 328           else
 329             next_comma = comma;
 330           break;
 331         case OP_SHFT:
 332           shift = SHFT (opcode);
 333           if (!optional || shift != 0)
 334             {
 335               sprintf (operand[i], "%d", (unsigned) shift);
 336               info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 337             }
 338           else
 339             next_comma = comma;
 340           break;
 341         case OP_lk:
 342           sprintf (operand[i], "#%d", (int) (short) opcode2);
 343           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 344           break;
 345         case OP_T:
 346           sprintf (operand[i], "t");
 347           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 348           break;
 349         case OP_TS:
 350           sprintf (operand[i], "ts");
 351           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 352           break;
 353         case OP_k8:
 354           sprintf (operand[i], "%d", (int) ((signed char) (opcode & 0xFF)));
 355           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 356           break;
 357         case OP_16:
 358           sprintf (operand[i], "16");
 359           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 360           break;
 361         case OP_ASM:
 362           sprintf (operand[i], "asm");
 363           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 364           break;
 365         case OP_BITC:
 366           sprintf (operand[i], "%d", (int) (opcode & 0xF));
 367           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 368           break;
 369         case OP_CC:
 370           /* put all CC operands in the same operand */
 371           sprint_condition (info, operand[i], opcode);
 372           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 373           i = MAX_OPERANDS;
 374           break;
 375         case OP_CC2:
 376           sprint_cc2 (info, operand[i], opcode);
 377           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 378           break;
 379         case OP_CC3:
 380         {
 381           const char *code[] = { "eq", "lt", "gt", "neq" };
 382
 383           /* Do not use sprintf with only two parameters as a
 384              compiler warning could be generated in such conditions.  */
 385           sprintf (operand[i], "%s", code[CC3 (opcode)]);
 386           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 387           break;
 388         }
 389         case OP_123:
 390           {
 391             int code = (opcode >> 8) & 0x3;
 392             sprintf (operand[i], "%d", (code == 0) ? 1 : (code == 2) ? 2 : 3);
 393             info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 394             break;
 395           }
 396         case OP_k5:
 397           sprintf (operand[i], "#%d", ((opcode & 0x1F) ^ 0x10) - 0x10);
 398           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 399           break;
 400         case OP_k8u:
 401           sprintf (operand[i], "#%d", (unsigned) (opcode & 0xFF));
 402           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 403           break;
 404         case OP_k3:
 405           sprintf (operand[i], "#%d", (int) (opcode & 0x7));
 406           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 407           break;
 408         case OP_lku:
 409           sprintf (operand[i], "#%d", (unsigned) opcode2);
 410           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 411           break;
 412         case OP_N:
 413           n = (opcode >> 9) & 0x1;
 414           sprintf (operand[i], "st%d", n);
 415           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 416           break;
 417         case OP_SBIT:
 418         {
 419           const char *status0[] = {
 420             "0", "1", "2", "3", "4", "5", "6", "7", "8",
 421             "ovb", "ova", "c", "tc", "13", "14", "15"
 422           };
 423           const char *status1[] = {
 424             "0", "1", "2", "3", "4",
 425             "cmpt", "frct", "c16", "sxm", "ovm", "10",
 426             "intm", "hm", "xf", "cpl", "braf"
 427           };
 428           sprintf (operand[i], "%s",
 429                    n ? status1[SBIT (opcode)] : status0[SBIT (opcode)]);
 430           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 431           break;
 432         }
 433         case OP_12:
 434           sprintf (operand[i], "%d", (int) ((opcode >> 9) & 1) + 1);
 435           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 436           break;
 437         case OP_TRN:
 438           sprintf (operand[i], "trn");
 439           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 440           break;
 441         case OP_DP:
 442           sprintf (operand[i], "dp");
 443           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 444           break;
 445         case OP_k9:
 446           /* FIXME-- this is DP, print the original address? */
 447           sprintf (operand[i], "#%d", (int) (opcode & 0x1FF));
 448           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 449           break;
 450         case OP_ARP:
 451           sprintf (operand[i], "arp");
 452           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 453           break;
 454         case OP_031:
 455           sprintf (operand[i], "%d", (int) (opcode & 0x1F));
 456           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 457           break;
 458         default:
 459           sprintf (operand[i], "??? (0x%x)", tm_operands[i]);
 460           info->fprintf_func (info->stream, "%s%s", comma, operand[i]);
 461           break;
 462         }
 463       comma = next_comma;
 464     }
 465   return 1;
 466 }
 467
 468 static int
 469 print_parallel_instruction (disassemble_info *info,
 470                             bfd_vma memaddr,
 471                             unsigned short opcode,
 472                             const insn_template *ptm,
 473                             int size)
 474 {
 475   print_instruction (info, memaddr, opcode,
 476                      ptm->name, ptm->operand_types, size, 0);
 477   info->fprintf_func (info->stream, " || ");
 478   return print_instruction (info, memaddr, opcode,
 479                             ptm->parname, ptm->paroperand_types, size, 0);
 480 }
 481
 482 static int
 483 sprint_dual_address (disassemble_info *info ATTRIBUTE_UNUSED,
 484                      char buf[],
 485                      unsigned short code)
 486 {
 487   const char *formats[] = {
 488     "*ar%d",
 489     "*ar%d-",
 490     "*ar%d+",
 491     "*ar%d+0%%",
 492   };
 493   return sprintf (buf, formats[XMOD (code)], XARX (code));
 494 }
 495
 496 static int
 497 sprint_indirect_address (disassemble_info *info ATTRIBUTE_UNUSED,
 498                          char buf[],
 499                          unsigned short opcode)
 500 {
 501   const char *formats[] = {
 502     "*ar%d",
 503     "*ar%d-",
 504     "*ar%d+",
 505     "*+ar%d",
 506     "*ar%d-0B",
 507     "*ar%d-0",
 508     "*ar%d+0",
 509     "*ar%d+0B",
 510     "*ar%d-%%",
 511     "*ar%d-0%%",
 512     "*ar%d+%%",
 513     "*ar%d+0%%",
 514   };
 515   return sprintf (buf, formats[MOD (opcode)], ARF (opcode));
 516 }
 517
 518 static int
 519 sprint_direct_address (disassemble_info *info ATTRIBUTE_UNUSED,
 520                        char buf[],
 521                        unsigned short opcode)
 522 {
 523   /* FIXME -- look up relocation if available */
 524   return sprintf (buf, "DP+0x%02x", (int) (opcode & 0x7F));
 525 }
 526
 527 static int
 528 sprint_mmr (disassemble_info *info ATTRIBUTE_UNUSED,
 529             char buf[],
 530             int mmr)
 531 {
 532   tic54x_symbol *reg = (tic54x_symbol *) mmregs;
 533   while (reg->name != NULL)
 534     {
 535       if (mmr == reg->value)
 536         {
 537           sprintf (buf, "%s", (reg + 1)->name);
 538           return 1;
 539         }
 540       ++reg;
 541     }
 542   sprintf (buf, "MMR(%d)", mmr); /* FIXME -- different targets.  */
 543   return 0;
 544 }
 545
 546 static int
 547 sprint_cc2 (disassemble_info *info ATTRIBUTE_UNUSED,
 548             char *buf,
 549             unsigned short opcode)
 550 {
 551   const char *cc2[] = {
 552     "??", "??", "ageq", "alt", "aneq", "aeq", "agt", "aleq",
 553     "??", "??", "bgeq", "blt", "bneq", "beq", "bgt", "bleq",
 554   };
 555   return sprintf (buf, "%s", cc2[opcode & 0xF]);
 556 }
 557
 558 static int
 559 sprint_condition (disassemble_info *info ATTRIBUTE_UNUSED,
 560                   char *buf,
 561                   unsigned short opcode)
 562 {
 563   char *start = buf;
 564   const char *cmp[] = {
 565       "??", "??", "geq", "lt", "neq", "eq", "gt", "leq"
 566   };
 567   if (opcode & 0x40)
 568     {
 569       char acc = (opcode & 0x8) ? 'b' : 'a';
 570       if (opcode & 0x7)
 571           buf += sprintf (buf, "%c%s%s", acc, cmp[(opcode & 0x7)],
 572                           (opcode & 0x20) ? ", " : "");
 573       if (opcode & 0x20)
 574           buf += sprintf (buf, "%c%s", acc, (opcode & 0x10) ? "ov" : "nov");
 575     }
 576   else if (opcode & 0x3F)
 577     {
 578       if (opcode & 0x30)
 579         buf += sprintf (buf, "%s%s",
 580                         ((opcode & 0x30) == 0x30) ? "tc" : "ntc",
 581                         (opcode & 0x0F) ? ", " : "");
 582       if (opcode & 0x0C)
 583         buf += sprintf (buf, "%s%s",
 584                         ((opcode & 0x0C) == 0x0C) ? "c" : "nc",
 585                         (opcode & 0x03) ? ", " : "");
 586       if (opcode & 0x03)
 587         buf += sprintf (buf, "%s",
 588                         ((opcode & 0x03) == 0x03) ? "bio" : "nbio");
 589     }
 590   else
 591     buf += sprintf (buf, "unc");
 592
 593   return buf - start;
 594 }