opcodes/dlx-dis.c

   1 /* Instruction printing code for the DLX Microprocessor
   2    Copyright 2002 Free Software Foundation, Inc.
   3    Contributed by Kuang Hwa Lin.  Written by Kuang Hwa Lin, 03/2002.
   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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  18
  19 #include "sysdep.h"
  20 #include "dis-asm.h"
  21 #include "opcode/dlx.h"
  22
  23 #define R_ERROR     0x1
  24 #define R_TYPE      0x2
  25 #define ILD_TYPE    0x3
  26 #define IST_TYPE    0x4
  27 #define IAL_TYPE    0x5
  28 #define IBR_TYPE    0x6
  29 #define IJ_TYPE     0x7
  30 #define IJR_TYPE    0x8
  31 #define NIL         0x9
  32
  33 #define OPC(x)      ((x >> 26) & 0x3F)
  34 #define FUNC(x)     (x & 0x7FF)
  35
  36 unsigned char opc, rs1, rs2, rd;
  37 unsigned long imm26, imm16, func, current_insn_addr;
  38
  39 static unsigned char dlx_get_opcode PARAMS ((unsigned long));
  40 static unsigned char dlx_get_rs1    PARAMS ((unsigned long));
  41 static unsigned char dlx_get_rs2    PARAMS ((unsigned long));
  42 static unsigned char dlx_get_rdR    PARAMS ((unsigned long));
  43 static unsigned long dlx_get_func   PARAMS ((unsigned long));
  44 static unsigned long dlx_get_imm16  PARAMS ((unsigned long));
  45 static unsigned long dlx_get_imm26  PARAMS ((unsigned long));
  46 static void     operand_deliminator PARAMS ((struct disassemble_info *, char *));
  47 static unsigned char dlx_r_type     PARAMS ((struct disassemble_info *));
  48 static unsigned char dlx_load_type  PARAMS ((struct disassemble_info *));
  49 static unsigned char dlx_store_type PARAMS ((struct disassemble_info *));
  50 static unsigned char dlx_aluI_type  PARAMS ((struct disassemble_info *));
  51 static unsigned char dlx_br_type    PARAMS ((struct disassemble_info *));
  52 static unsigned char dlx_jmp_type   PARAMS ((struct disassemble_info *));
  53 static unsigned char dlx_jr_type    PARAMS ((struct disassemble_info *));
  54
  55 /* Print one instruction from MEMADDR on INFO->STREAM.
  56    Return the size of the instruction (always 4 on dlx).  */
  57
  58 static unsigned char
  59 dlx_get_opcode (opcode)
  60      unsigned long opcode;
  61 {
  62   return (unsigned char) ((opcode >> 26) & 0x3F);
  63 }
  64
  65 static unsigned char
  66 dlx_get_rs1 (opcode)
  67      unsigned long opcode;
  68 {
  69   return (unsigned char) ((opcode >> 21) & 0x1F);
  70 }
  71
  72 static unsigned char
  73 dlx_get_rs2 (opcode)
  74      unsigned long opcode;
  75 {
  76   return (unsigned char) ((opcode >> 16) & 0x1F);
  77 }
  78
  79 static unsigned char
  80 dlx_get_rdR (opcode)
  81      unsigned long opcode;
  82 {
  83   return (unsigned char) ((opcode >> 11) & 0x1F);
  84 }
  85
  86 static unsigned long
  87 dlx_get_func (opcode)
  88      unsigned long opcode;
  89 {
  90   return (unsigned char) (opcode & 0x7FF);
  91 }
  92
  93 static unsigned long
  94 dlx_get_imm16 (opcode)
  95      unsigned long opcode;
  96 {
  97   return (unsigned long) (opcode & 0xFFFF);
  98 }
  99
 100 static unsigned long
 101 dlx_get_imm26 (opcode)
 102      unsigned long opcode;
 103 {
 104   return (unsigned long) (opcode & 0x03FFFFFF);
 105 }
 106
 107 /* Fill the opcode to the max length.  */
 108 static void
 109 operand_deliminator (info, ptr)
 110      struct disassemble_info *info;
 111      char *ptr;
 112 {
 113   int difft = 8 - (int) strlen (ptr);
 114
 115   while (difft > 0)
 116     {
 117       (*info->fprintf_func) (info->stream, "%c", ' ');
 118       difft -= 1;
 119     }
 120 }
 121
 122 /* Process the R-type opcode.  */
 123 static unsigned char
 124 dlx_r_type (info)
 125      struct disassemble_info *info;
 126 {
 127   unsigned char r_opc[] = { OPC(ALUOP) }; /* Fix ME */
 128   int r_opc_num = (sizeof r_opc) / (sizeof (char));
 129   struct _r_opcode
 130   {
 131     unsigned long func;
 132     char *name;
 133   }
 134   dlx_r_opcode[] =
 135     {
 136     { NOPF,     "nop"    },  /* NOP                          */
 137     { ADDF,     "add"    },  /* Add                          */
 138     { ADDUF,    "addu"   },  /* Add Unsigned                 */
 139     { SUBF,     "sub"    },  /* SUB                          */
 140     { SUBUF,    "subu"   },  /* Sub Unsigned                 */
 141     { MULTF,    "mult"   },  /* MULTIPLY                     */
 142     { MULTUF,   "multu"  },  /* MULTIPLY Unsigned            */
 143     { DIVF,     "div"    },  /* DIVIDE                       */
 144     { DIVUF,    "divu"   },  /* DIVIDE Unsigned              */
 145     { ANDF,     "and"    },  /* AND                          */
 146     { ORF,      "or"     },  /* OR                           */
 147     { XORF,     "xor"    },  /* Exclusive OR                 */
 148     { SLLF,     "sll"    },  /* SHIFT LEFT LOGICAL           */
 149     { SRAF,     "sra"    },  /* SHIFT RIGHT ARITHMETIC       */
 150     { SRLF,     "srl"    },  /* SHIFT RIGHT LOGICAL          */
 151     { SEQF,     "seq"    },  /* Set if equal                 */
 152     { SNEF,     "sne"    },  /* Set if not equal             */
 153     { SLTF,     "slt"    },  /* Set if less                  */
 154     { SGTF,     "sgt"    },  /* Set if greater               */
 155     { SLEF,     "sle"    },  /* Set if less or equal         */
 156     { SGEF,     "sge"    },  /* Set if greater or equal      */
 157     { SEQUF,    "sequ"   },  /* Set if equal                 */
 158     { SNEUF,    "sneu"   },  /* Set if not equal             */
 159     { SLTUF,    "sltu"   },  /* Set if less                  */
 160     { SGTUF,    "sgtu"   },  /* Set if greater               */
 161     { SLEUF,    "sleu"   },  /* Set if less or equal         */
 162     { SGEUF,    "sgeu"   },  /* Set if greater or equal      */
 163     { MVTSF,    "mvts"   },  /* Move to special register     */
 164     { MVFSF,    "mvfs"   },  /* Move from special register   */
 165     { BSWAPF,   "bswap"  },  /* Byte swap ??                 */
 166     { LUTF,     "lut"    }   /* ????????? ??                 */
 167   };
 168   int dlx_r_opcode_num = (sizeof dlx_r_opcode) / (sizeof dlx_r_opcode[0]);
 169   int idx;
 170
 171   for (idx = 0; idx < r_opc_num; idx++)
 172     {
 173       if (r_opc[idx] != opc)
 174         continue;
 175       else
 176         break;
 177   }
 178
 179   if (idx == r_opc_num)
 180     return NIL;
 181
 182   for (idx = 0 ; idx < dlx_r_opcode_num; idx++)
 183     if (dlx_r_opcode[idx].func == func)
 184       {
 185         (*info->fprintf_func) (info->stream, "%s", dlx_r_opcode[idx].name);
 186
 187         if (func != NOPF)
 188           {
 189             /* This is not a nop.  */
 190             operand_deliminator (info, dlx_r_opcode[idx].name);
 191             (*info->fprintf_func) (info->stream, "r%d,", (int)rd);
 192             (*info->fprintf_func) (info->stream, "r%d", (int)rs1);
 193             if (func != MVTSF && func != MVFSF)
 194               (*info->fprintf_func) (info->stream, ",r%d", (int)rs2);
 195           }
 196         return (unsigned char) R_TYPE;
 197       }
 198
 199   return (unsigned char) R_ERROR;
 200 }
 201
 202 /* Process the memory read opcode.  */
 203
 204 static unsigned char
 205 dlx_load_type (info)
 206      struct disassemble_info* info;
 207 {
 208   struct _load_opcode
 209   {
 210     unsigned long opcode;
 211     char *name;
 212   }
 213   dlx_load_opcode[] =
 214     {
 215       { OPC(LHIOP),   "lhi" },  /* Load HI to register.           */
 216       { OPC(LBOP),     "lb" },  /* load byte sign extended.       */
 217       { OPC(LBUOP),   "lbu" },  /* load byte unsigned.            */
 218       { OPC(LSBUOP),"ldstbu"},  /* load store byte unsigned.      */
 219       { OPC(LHOP),     "lh" },  /* load halfword sign extended.   */
 220       { OPC(LHUOP),   "lhu" },  /* load halfword unsigned.        */
 221       { OPC(LSHUOP),"ldsthu"},  /* load store halfword unsigned.  */
 222       { OPC(LWOP),     "lw" },  /* load word.                     */
 223       { OPC(LSWOP), "ldstw" }   /* load store word.               */
 224     };
 225   int dlx_load_opcode_num =
 226     (sizeof dlx_load_opcode) / (sizeof dlx_load_opcode[0]);
 227   int idx;
 228
 229   for (idx = 0 ; idx < dlx_load_opcode_num; idx++)
 230     if (dlx_load_opcode[idx].opcode == opc)
 231       {
 232         if (opc == OPC (LHIOP))
 233           {
 234             (*info->fprintf_func) (info->stream, "%s", dlx_load_opcode[idx].name);
 235             operand_deliminator (info, dlx_load_opcode[idx].name);
 236             (*info->fprintf_func) (info->stream, "r%d,", (int)rs2);
 237             (*info->fprintf_func) (info->stream, "0x%04x", (int)imm16);
 238           }
 239         else
 240           {
 241             (*info->fprintf_func) (info->stream, "%s", dlx_load_opcode[idx].name);
 242             operand_deliminator (info, dlx_load_opcode[idx].name);
 243             (*info->fprintf_func) (info->stream, "r%d,", (int)rs2);
 244             (*info->fprintf_func) (info->stream, "0x%04x[r%d]", (int)imm16, (int)rs1);
 245           }
 246
 247         return (unsigned char) ILD_TYPE;
 248     }
 249
 250   return (unsigned char) NIL;
 251 }
 252
 253 /* Process the memory store opcode.  */
 254
 255 static unsigned char
 256 dlx_store_type (info)
 257      struct disassemble_info* info;
 258 {
 259   struct _store_opcode
 260   {
 261     unsigned long opcode;
 262     char *name;
 263   }
 264   dlx_store_opcode[] =
 265     {
 266       { OPC(SBOP),     "sb" },  /* Store byte.      */
 267       { OPC(SHOP),     "sh" },  /* Store halfword.  */
 268       { OPC(SWOP),     "sw" },  /* Store word.      */
 269     };
 270   int dlx_store_opcode_num =
 271     (sizeof dlx_store_opcode) / (sizeof dlx_store_opcode[0]);
 272   int idx;
 273
 274   for (idx = 0 ; idx < dlx_store_opcode_num; idx++)
 275     if (dlx_store_opcode[idx].opcode == opc)
 276       {
 277         (*info->fprintf_func) (info->stream, "%s", dlx_store_opcode[idx].name);
 278         operand_deliminator (info, dlx_store_opcode[idx].name);
 279         (*info->fprintf_func) (info->stream, "0x%04x[r%d],", (int)imm16, (int)rs1);
 280         (*info->fprintf_func) (info->stream, "r%d", (int)rs2);
 281         return (unsigned char) IST_TYPE;
 282       }
 283
 284   return (unsigned char) NIL;
 285 }
 286
 287 /* Process the Arithmetic and Logical I-TYPE opcode.  */
 288
 289 static unsigned char
 290 dlx_aluI_type (info)
 291      struct disassemble_info* info;
 292 {
 293   struct _aluI_opcode
 294   {
 295     unsigned long opcode;
 296     char *name;
 297   }
 298   dlx_aluI_opcode[] =
 299     {
 300       { OPC(ADDIOP),   "addi"  },  /* Store byte.      */
 301       { OPC(ADDUIOP),  "addui" },  /* Store halfword.  */
 302       { OPC(SUBIOP),   "subi"  },  /* Store word.      */
 303       { OPC(SUBUIOP),  "subui" },  /* Store word.      */
 304       { OPC(ANDIOP),   "andi"  },  /* Store word.      */
 305       { OPC(ORIOP),    "ori"   },  /* Store word.      */
 306       { OPC(XORIOP),   "xori"  },  /* Store word.      */
 307       { OPC(SLLIOP),   "slli"  },  /* Store word.      */
 308       { OPC(SRAIOP),   "srai"  },  /* Store word.      */
 309       { OPC(SRLIOP),   "srli"  },  /* Store word.      */
 310       { OPC(SEQIOP),   "seqi"  },  /* Store word.      */
 311       { OPC(SNEIOP),   "snei"  },  /* Store word.      */
 312       { OPC(SLTIOP),   "slti"  },  /* Store word.      */
 313       { OPC(SGTIOP),   "sgti"  },  /* Store word.      */
 314       { OPC(SLEIOP),   "slei"  },  /* Store word.      */
 315       { OPC(SGEIOP),   "sgei"  },  /* Store word.      */
 316       { OPC(SEQUIOP),  "sequi" },  /* Store word.      */
 317       { OPC(SNEUIOP),  "sneui" },  /* Store word.      */
 318       { OPC(SLTUIOP),  "sltui" },  /* Store word.      */
 319       { OPC(SGTUIOP),  "sgtui" },  /* Store word.      */
 320       { OPC(SLEUIOP),  "sleui" },  /* Store word.      */
 321       { OPC(SGEUIOP),  "sgeui" },  /* Store word.      */
 322 #if 0
 323       { OPC(MVTSOP),   "mvts"  },  /* Store word.      */
 324       { OPC(MVFSOP),   "mvfs"  },  /* Store word.      */
 325 #endif
 326     };
 327   int dlx_aluI_opcode_num =
 328     (sizeof dlx_aluI_opcode) / (sizeof dlx_aluI_opcode[0]);
 329   int idx;
 330
 331   for (idx = 0 ; idx < dlx_aluI_opcode_num; idx++)
 332     if (dlx_aluI_opcode[idx].opcode == opc)
 333       {
 334         (*info->fprintf_func) (info->stream, "%s", dlx_aluI_opcode[idx].name);
 335         operand_deliminator (info, dlx_aluI_opcode[idx].name);
 336         (*info->fprintf_func) (info->stream, "r%d,", (int)rs2);
 337         (*info->fprintf_func) (info->stream, "r%d,", (int)rs1);
 338         (*info->fprintf_func) (info->stream, "0x%04x", (int)imm16);
 339
 340         return (unsigned char) IAL_TYPE;
 341       }
 342
 343   return (unsigned char) NIL;
 344 }
 345
 346 /* Process the branch instruction.  */
 347
 348 static unsigned char
 349 dlx_br_type (info)
 350      struct disassemble_info* info;
 351 {
 352   struct _br_opcode
 353   {
 354     unsigned long opcode;
 355     char *name;
 356   }
 357   dlx_br_opcode[] =
 358     {
 359       { OPC(BEQOP), "beqz" }, /* Store byte.  */
 360       { OPC(BNEOP), "bnez" }  /* Store halfword.  */
 361     };
 362   int dlx_br_opcode_num =
 363     (sizeof dlx_br_opcode) / (sizeof dlx_br_opcode[0]);
 364   int idx;
 365
 366   for (idx = 0 ; idx < dlx_br_opcode_num; idx++)
 367     if (dlx_br_opcode[idx].opcode == opc)
 368       {
 369         if (imm16 & 0x00008000)
 370           imm16 |= 0xFFFF0000;
 371
 372         imm16 += (current_insn_addr + 4);
 373         (*info->fprintf_func) (info->stream, "%s", dlx_br_opcode[idx].name);
 374         operand_deliminator (info, dlx_br_opcode[idx].name);
 375         (*info->fprintf_func) (info->stream, "r%d,", (int)rs1);
 376         (*info->fprintf_func) (info->stream, "0x%08x", (int)imm16);
 377
 378         return (unsigned char) IBR_TYPE;
 379       }
 380
 381   return (unsigned char) NIL;
 382 }
 383
 384 /* Process the jump instruction.  */
 385
 386 static unsigned char
 387 dlx_jmp_type (info)
 388      struct disassemble_info* info;
 389 {
 390   struct _jmp_opcode
 391   {
 392     unsigned long opcode;
 393     char *name;
 394   }
 395   dlx_jmp_opcode[] =
 396     {
 397       { OPC(JOP),         "j" },  /* Store byte.      */
 398       { OPC(JALOP),     "jal" },  /* Store halfword.  */
 399       { OPC(BREAKOP), "break" },  /* Store halfword.  */
 400       { OPC(TRAPOP),   "trap" },  /* Store halfword.  */
 401       { OPC(RFEOP),     "rfe" }   /* Store halfword.  */
 402     };
 403   int dlx_jmp_opcode_num =
 404     (sizeof dlx_jmp_opcode) / (sizeof dlx_jmp_opcode[0]);
 405   int idx;
 406
 407   for (idx = 0 ; idx < dlx_jmp_opcode_num; idx++)
 408     if (dlx_jmp_opcode[idx].opcode == opc)
 409       {
 410         if (imm26 & 0x02000000)
 411           imm26 |= 0xFC000000;
 412
 413         imm26 += (current_insn_addr + 4);
 414
 415         (*info->fprintf_func) (info->stream, "%s", dlx_jmp_opcode[idx].name);
 416         operand_deliminator (info, dlx_jmp_opcode[idx].name);
 417         (*info->fprintf_func) (info->stream, "0x%08x", (int)imm26);
 418
 419         return (unsigned char) IJ_TYPE;
 420       }
 421
 422   return (unsigned char) NIL;
 423 }
 424
 425 /* Process the jump register instruction.  */
 426
 427 static unsigned char
 428 dlx_jr_type (info)
 429      struct disassemble_info* info;
 430 {
 431   struct _jr_opcode
 432   {
 433     unsigned long opcode;
 434     char *name;
 435   }
 436   dlx_jr_opcode[] = {
 437     { OPC(JROP),   "jr"    },  /* Store byte.  */
 438     { OPC(JALROP), "jalr"  }   /* Store halfword.  */
 439   };
 440   int dlx_jr_opcode_num =
 441     (sizeof dlx_jr_opcode) / (sizeof dlx_jr_opcode[0]);
 442   int idx;
 443
 444   for (idx = 0 ; idx < dlx_jr_opcode_num; idx++)
 445     if (dlx_jr_opcode[idx].opcode == opc)
 446       {
 447         (*info->fprintf_func) (info->stream, "%s", dlx_jr_opcode[idx].name);
 448         operand_deliminator (info, dlx_jr_opcode[idx].name);
 449         (*info->fprintf_func) (info->stream, "r%d", (int)rs1);
 450         return (unsigned char) IJR_TYPE;
 451       }
 452
 453   return (unsigned char) NIL;
 454 }
 455
 456 typedef unsigned char (* dlx_insn) PARAMS ((struct disassemble_info *));
 457
 458 /* This is the main DLX insn handling routine.  */
 459
 460 int
 461 print_insn_dlx (memaddr, info)
 462      bfd_vma memaddr;
 463      struct disassemble_info* info;
 464 {
 465   bfd_byte buffer[4];
 466   int insn_idx;
 467   unsigned long insn_word;
 468   unsigned char rtn_code;
 469   unsigned long dlx_insn_type[] =
 470     {
 471       (unsigned long) dlx_r_type,
 472       (unsigned long) dlx_load_type,
 473       (unsigned long) dlx_store_type,
 474       (unsigned long) dlx_aluI_type,
 475       (unsigned long) dlx_br_type,
 476       (unsigned long) dlx_jmp_type,
 477       (unsigned long) dlx_jr_type,
 478       (unsigned long) NULL
 479   };
 480   int dlx_insn_type_num = ((sizeof dlx_insn_type) / (sizeof (unsigned long))) - 1;
 481   int status =
 482     (*info->read_memory_func) (memaddr, (bfd_byte *) &buffer[0], 4, info);
 483
 484   if (status != 0)
 485     {
 486       (*info->memory_error_func) (status, memaddr, info);
 487       return -1;
 488     }
 489
 490   /* Now decode the insn    */
 491   insn_word = bfd_getb32 (buffer);
 492   opc  = dlx_get_opcode (insn_word);
 493   rs1  = dlx_get_rs1 (insn_word);
 494   rs2  = dlx_get_rs2 (insn_word);
 495   rd   = dlx_get_rdR (insn_word);
 496   func = dlx_get_func (insn_word);
 497   imm16= dlx_get_imm16 (insn_word);
 498   imm26= dlx_get_imm26 (insn_word);
 499
 500 #if 0
 501   printf ("print_insn_big_dlx: opc = 0x%02x\n"
 502           "                    rs1 = 0x%02x\n"
 503           "                    rs2 = 0x%02x\n"
 504           "                    rd  = 0x%02x\n"
 505           "                  func  = 0x%08x\n"
 506           "                 imm16  = 0x%08x\n"
 507           "                 imm26  = 0x%08x\n",
 508           opc, rs1, rs2, rd, func, imm16, imm26);
 509 #endif
 510
 511   /* Scan through all the insn type and print the insn out.  */
 512   rtn_code = 0;
 513   current_insn_addr = (unsigned long) memaddr;
 514
 515   for (insn_idx = 0; dlx_insn_type[insn_idx] != 0x0; insn_idx++)
 516     switch (((dlx_insn) (dlx_insn_type[insn_idx])) (info))
 517       {
 518         /* Found the correct opcode   */
 519       case R_TYPE:
 520       case ILD_TYPE:
 521       case IST_TYPE:
 522       case IAL_TYPE:
 523       case IBR_TYPE:
 524       case IJ_TYPE:
 525       case IJR_TYPE:
 526         return 4;
 527
 528         /* Wrong insn type check next one. */
 529       default:
 530       case NIL:
 531         continue;
 532
 533         /* All rest of the return code are not recongnized, treat it as error */
 534         /* we should never get here,  I hope! */
 535       case R_ERROR:
 536         return -1;
 537       }
 538
 539   if (insn_idx ==  dlx_insn_type_num)
 540     /* Well, does not recoganize this opcode.  */
 541     (*info->fprintf_func) (info->stream, "<%s>", "Unrecognized Opcode");
 542
 543   return 4;
 544 }