opcodes/dlx-dis.c

   1 /* Instruction printing code for the DLX Microprocessor
   2    Copyright (C) 2002-2024 Free Software Foundation, Inc.
   3    Contributed by Kuang Hwa Lin.  Written by Kuang Hwa Lin, 03/2002.
   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 program; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  20    MA 02110-1301, USA.  */
  21
  22 #include "sysdep.h"
  23 #include "disassemble.h"
  24 #include "opcode/dlx.h"
  25
  26 #define R_ERROR     0x1
  27 #define R_TYPE      0x2
  28 #define ILD_TYPE    0x3
  29 #define IST_TYPE    0x4
  30 #define IAL_TYPE    0x5
  31 #define IBR_TYPE    0x6
  32 #define IJ_TYPE     0x7
  33 #define IJR_TYPE    0x8
  34 #define NIL         0x9
  35
  36 #define OPC(x)      ((x >> 26) & 0x3F)
  37 #define FUNC(x)     (x & 0x7FF)
  38
  39 unsigned char opc, rs1, rs2, rd;
  40 unsigned long imm26, imm16, func, current_insn_addr;
  41
  42 /* Print one instruction from MEMADDR on INFO->STREAM.
  43    Return the size of the instruction (always 4 on dlx).  */
  44
  45 static unsigned char
  46 dlx_get_opcode (unsigned long opcode)
  47 {
  48   return (unsigned char) ((opcode >> 26) & 0x3F);
  49 }
  50
  51 static unsigned char
  52 dlx_get_rs1 (unsigned long opcode)
  53 {
  54   return (unsigned char) ((opcode >> 21) & 0x1F);
  55 }
  56
  57 static unsigned char
  58 dlx_get_rs2 (unsigned long opcode)
  59 {
  60   return (unsigned char) ((opcode >> 16) & 0x1F);
  61 }
  62
  63 static unsigned char
  64 dlx_get_rdR (unsigned long opcode)
  65 {
  66   return (unsigned char) ((opcode >> 11) & 0x1F);
  67 }
  68
  69 static unsigned long
  70 dlx_get_func (unsigned long opcode)
  71 {
  72   return (unsigned char) (opcode & 0x7FF);
  73 }
  74
  75 static unsigned long
  76 dlx_get_imm16 (unsigned long opcode)
  77 {
  78   return (unsigned long) (opcode & 0xFFFF);
  79 }
  80
  81 static unsigned long
  82 dlx_get_imm26 (unsigned long opcode)
  83 {
  84   return (unsigned long) (opcode & 0x03FFFFFF);
  85 }
  86
  87 /* Fill the opcode to the max length.  */
  88
  89 static void
  90 operand_deliminator (struct disassemble_info *info, char *ptr)
  91 {
  92   int difft = 8 - (int) strlen (ptr);
  93
  94   while (difft > 0)
  95     {
  96       (*info->fprintf_func) (info->stream, "%c", ' ');
  97       difft -= 1;
  98     }
  99 }
 100
 101 /* Process the R-type opcode.  */
 102
 103 static unsigned char
 104 dlx_r_type (struct disassemble_info *info)
 105 {
 106   unsigned char r_opc[] = { OPC(ALUOP) }; /* Fix ME */
 107   int r_opc_num = (sizeof r_opc) / (sizeof (char));
 108   struct _r_opcode
 109   {
 110     unsigned long func;
 111     char *name;
 112   }
 113   dlx_r_opcode[] =
 114   {
 115     { NOPF,     "nop"    },  /* NOP                          */
 116     { ADDF,     "add"    },  /* Add                          */
 117     { ADDUF,    "addu"   },  /* Add Unsigned                 */
 118     { SUBF,     "sub"    },  /* SUB                          */
 119     { SUBUF,    "subu"   },  /* Sub Unsigned                 */
 120     { MULTF,    "mult"   },  /* MULTIPLY                     */
 121     { MULTUF,   "multu"  },  /* MULTIPLY Unsigned            */
 122     { DIVF,     "div"    },  /* DIVIDE                       */
 123     { DIVUF,    "divu"   },  /* DIVIDE Unsigned              */
 124     { ANDF,     "and"    },  /* AND                          */
 125     { ORF,      "or"     },  /* OR                           */
 126     { XORF,     "xor"    },  /* Exclusive OR                 */
 127     { SLLF,     "sll"    },  /* SHIFT LEFT LOGICAL           */
 128     { SRAF,     "sra"    },  /* SHIFT RIGHT ARITHMETIC       */
 129     { SRLF,     "srl"    },  /* SHIFT RIGHT LOGICAL          */
 130     { SEQF,     "seq"    },  /* Set if equal                 */
 131     { SNEF,     "sne"    },  /* Set if not equal             */
 132     { SLTF,     "slt"    },  /* Set if less                  */
 133     { SGTF,     "sgt"    },  /* Set if greater               */
 134     { SLEF,     "sle"    },  /* Set if less or equal         */
 135     { SGEF,     "sge"    },  /* Set if greater or equal      */
 136     { SEQUF,    "sequ"   },  /* Set if equal                 */
 137     { SNEUF,    "sneu"   },  /* Set if not equal             */
 138     { SLTUF,    "sltu"   },  /* Set if less                  */
 139     { SGTUF,    "sgtu"   },  /* Set if greater               */
 140     { SLEUF,    "sleu"   },  /* Set if less or equal         */
 141     { SGEUF,    "sgeu"   },  /* Set if greater or equal      */
 142     { MVTSF,    "mvts"   },  /* Move to special register     */
 143     { MVFSF,    "mvfs"   },  /* Move from special register   */
 144     { BSWAPF,   "bswap"  },  /* Byte swap ??                 */
 145     { LUTF,     "lut"    }   /* ????????? ??                 */
 146   };
 147   int dlx_r_opcode_num = (sizeof dlx_r_opcode) / (sizeof dlx_r_opcode[0]);
 148   int idx;
 149
 150   for (idx = 0; idx < r_opc_num; idx++)
 151     {
 152       if (r_opc[idx] != opc)
 153         continue;
 154       else
 155         break;
 156     }
 157
 158   if (idx == r_opc_num)
 159     return NIL;
 160
 161   for (idx = 0 ; idx < dlx_r_opcode_num; idx++)
 162     if (dlx_r_opcode[idx].func == func)
 163       {
 164         (*info->fprintf_func) (info->stream, "%s", dlx_r_opcode[idx].name);
 165
 166         if (func != NOPF)
 167           {
 168             /* This is not a nop.  */
 169             operand_deliminator (info, dlx_r_opcode[idx].name);
 170             (*info->fprintf_func) (info->stream, "r%d,", (int)rd);
 171             (*info->fprintf_func) (info->stream, "r%d", (int)rs1);
 172             if (func != MVTSF && func != MVFSF)
 173               (*info->fprintf_func) (info->stream, ",r%d", (int)rs2);
 174           }
 175         return (unsigned char) R_TYPE;
 176       }
 177
 178   return (unsigned char) R_ERROR;
 179 }
 180
 181 /* Process the memory read opcode.  */
 182
 183 static unsigned char
 184 dlx_load_type (struct disassemble_info* info)
 185 {
 186   struct _load_opcode
 187   {
 188     unsigned long opcode;
 189     char *name;
 190   }
 191   dlx_load_opcode[] =
 192   {
 193     { OPC(LHIOP),   "lhi" },  /* Load HI to register.           */
 194     { OPC(LBOP),     "lb" },  /* load byte sign extended.       */
 195     { OPC(LBUOP),   "lbu" },  /* load byte unsigned.            */
 196     { OPC(LSBUOP),"ldstbu"},  /* load store byte unsigned.      */
 197     { OPC(LHOP),     "lh" },  /* load halfword sign extended.   */
 198     { OPC(LHUOP),   "lhu" },  /* load halfword unsigned.        */
 199     { OPC(LSHUOP),"ldsthu"},  /* load store halfword unsigned.  */
 200     { OPC(LWOP),     "lw" },  /* load word.                     */
 201     { OPC(LSWOP), "ldstw" }   /* load store word.               */
 202   };
 203   int dlx_load_opcode_num =
 204     (sizeof dlx_load_opcode) / (sizeof dlx_load_opcode[0]);
 205   int idx;
 206
 207   for (idx = 0 ; idx < dlx_load_opcode_num; idx++)
 208     if (dlx_load_opcode[idx].opcode == opc)
 209       {
 210         if (opc == OPC (LHIOP))
 211           {
 212             (*info->fprintf_func) (info->stream, "%s", dlx_load_opcode[idx].name);
 213             operand_deliminator (info, dlx_load_opcode[idx].name);
 214             (*info->fprintf_func) (info->stream, "r%d,", (int)rs2);
 215             (*info->fprintf_func) (info->stream, "0x%04x", (int)imm16);
 216           }
 217         else
 218           {
 219             (*info->fprintf_func) (info->stream, "%s", dlx_load_opcode[idx].name);
 220             operand_deliminator (info, dlx_load_opcode[idx].name);
 221             (*info->fprintf_func) (info->stream, "r%d,", (int)rs2);
 222             (*info->fprintf_func) (info->stream, "0x%04x[r%d]", (int)imm16, (int)rs1);
 223           }
 224
 225         return (unsigned char) ILD_TYPE;
 226     }
 227
 228   return (unsigned char) NIL;
 229 }
 230
 231 /* Process the memory store opcode.  */
 232
 233 static unsigned char
 234 dlx_store_type (struct disassemble_info* info)
 235 {
 236   struct _store_opcode
 237   {
 238     unsigned long opcode;
 239     char *name;
 240   }
 241   dlx_store_opcode[] =
 242   {
 243     { OPC(SBOP),     "sb" },  /* Store byte.      */
 244     { OPC(SHOP),     "sh" },  /* Store halfword.  */
 245     { OPC(SWOP),     "sw" },  /* Store word.      */
 246   };
 247   int dlx_store_opcode_num =
 248     (sizeof dlx_store_opcode) / (sizeof dlx_store_opcode[0]);
 249   int idx;
 250
 251   for (idx = 0 ; idx < dlx_store_opcode_num; idx++)
 252     if (dlx_store_opcode[idx].opcode == opc)
 253       {
 254         (*info->fprintf_func) (info->stream, "%s", dlx_store_opcode[idx].name);
 255         operand_deliminator (info, dlx_store_opcode[idx].name);
 256         (*info->fprintf_func) (info->stream, "0x%04x[r%d],", (int)imm16, (int)rs1);
 257         (*info->fprintf_func) (info->stream, "r%d", (int)rs2);
 258         return (unsigned char) IST_TYPE;
 259       }
 260
 261   return (unsigned char) NIL;
 262 }
 263
 264 /* Process the Arithmetic and Logical I-TYPE opcode.  */
 265
 266 static unsigned char
 267 dlx_aluI_type (struct disassemble_info* info)
 268 {
 269   struct _aluI_opcode
 270   {
 271     unsigned long opcode;
 272     char *name;
 273   }
 274   dlx_aluI_opcode[] =
 275   {
 276     { OPC(ADDIOP),   "addi"  },  /* Store byte.      */
 277     { OPC(ADDUIOP),  "addui" },  /* Store halfword.  */
 278     { OPC(SUBIOP),   "subi"  },  /* Store word.      */
 279     { OPC(SUBUIOP),  "subui" },  /* Store word.      */
 280     { OPC(ANDIOP),   "andi"  },  /* Store word.      */
 281     { OPC(ORIOP),    "ori"   },  /* Store word.      */
 282     { OPC(XORIOP),   "xori"  },  /* Store word.      */
 283     { OPC(SLLIOP),   "slli"  },  /* Store word.      */
 284     { OPC(SRAIOP),   "srai"  },  /* Store word.      */
 285     { OPC(SRLIOP),   "srli"  },  /* Store word.      */
 286     { OPC(SEQIOP),   "seqi"  },  /* Store word.      */
 287     { OPC(SNEIOP),   "snei"  },  /* Store word.      */
 288     { OPC(SLTIOP),   "slti"  },  /* Store word.      */
 289     { OPC(SGTIOP),   "sgti"  },  /* Store word.      */
 290     { OPC(SLEIOP),   "slei"  },  /* Store word.      */
 291     { OPC(SGEIOP),   "sgei"  },  /* Store word.      */
 292     { OPC(SEQUIOP),  "sequi" },  /* Store word.      */
 293     { OPC(SNEUIOP),  "sneui" },  /* Store word.      */
 294     { OPC(SLTUIOP),  "sltui" },  /* Store word.      */
 295     { OPC(SGTUIOP),  "sgtui" },  /* Store word.      */
 296     { OPC(SLEUIOP),  "sleui" },  /* Store word.      */
 297     { OPC(SGEUIOP),  "sgeui" },  /* Store word.      */
 298 #if 0
 299     { OPC(MVTSOP),   "mvts"  },  /* Store word.      */
 300     { OPC(MVFSOP),   "mvfs"  },  /* Store word.      */
 301 #endif
 302   };
 303   int dlx_aluI_opcode_num =
 304     (sizeof dlx_aluI_opcode) / (sizeof dlx_aluI_opcode[0]);
 305   int idx;
 306
 307   for (idx = 0 ; idx < dlx_aluI_opcode_num; idx++)
 308     if (dlx_aluI_opcode[idx].opcode == opc)
 309       {
 310         (*info->fprintf_func) (info->stream, "%s", dlx_aluI_opcode[idx].name);
 311         operand_deliminator (info, dlx_aluI_opcode[idx].name);
 312         (*info->fprintf_func) (info->stream, "r%d,", (int)rs2);
 313         (*info->fprintf_func) (info->stream, "r%d,", (int)rs1);
 314         (*info->fprintf_func) (info->stream, "0x%04x", (int)imm16);
 315
 316         return (unsigned char) IAL_TYPE;
 317       }
 318
 319   return (unsigned char) NIL;
 320 }
 321
 322 /* Process the branch instruction.  */
 323
 324 static unsigned char
 325 dlx_br_type (struct disassemble_info* info)
 326 {
 327   struct _br_opcode
 328   {
 329     unsigned long opcode;
 330     char *name;
 331   }
 332   dlx_br_opcode[] =
 333   {
 334     { OPC(BEQOP), "beqz" }, /* Store byte.  */
 335     { OPC(BNEOP), "bnez" }  /* Store halfword.  */
 336   };
 337   int dlx_br_opcode_num =
 338     (sizeof dlx_br_opcode) / (sizeof dlx_br_opcode[0]);
 339   int idx;
 340
 341   for (idx = 0 ; idx < dlx_br_opcode_num; idx++)
 342     if (dlx_br_opcode[idx].opcode == opc)
 343       {
 344         if (imm16 & 0x00008000)
 345           imm16 |= 0xFFFF0000;
 346
 347         imm16 += (current_insn_addr + 4);
 348         (*info->fprintf_func) (info->stream, "%s", dlx_br_opcode[idx].name);
 349         operand_deliminator (info, dlx_br_opcode[idx].name);
 350         (*info->fprintf_func) (info->stream, "r%d,", (int) rs1);
 351         (*info->fprintf_func) (info->stream, "0x%08x", (int) imm16);
 352
 353         return (unsigned char) IBR_TYPE;
 354       }
 355
 356   return (unsigned char) NIL;
 357 }
 358
 359 /* Process the jump instruction.  */
 360
 361 static unsigned char
 362 dlx_jmp_type (struct disassemble_info* info)
 363 {
 364   struct _jmp_opcode
 365   {
 366     unsigned long opcode;
 367     char *name;
 368   }
 369   dlx_jmp_opcode[] =
 370   {
 371     { OPC(JOP),         "j" },  /* Store byte.      */
 372     { OPC(JALOP),     "jal" },  /* Store halfword.  */
 373     { OPC(BREAKOP), "break" },  /* Store halfword.  */
 374     { OPC(TRAPOP),   "trap" },  /* Store halfword.  */
 375     { OPC(RFEOP),     "rfe" }   /* Store halfword.  */
 376   };
 377   int dlx_jmp_opcode_num =
 378     (sizeof dlx_jmp_opcode) / (sizeof dlx_jmp_opcode[0]);
 379   int idx;
 380
 381   for (idx = 0 ; idx < dlx_jmp_opcode_num; idx++)
 382     if (dlx_jmp_opcode[idx].opcode == opc)
 383       {
 384         if (imm26 & 0x02000000)
 385           imm26 |= 0xFC000000;
 386
 387         imm26 += (current_insn_addr + 4);
 388
 389         (*info->fprintf_func) (info->stream, "%s", dlx_jmp_opcode[idx].name);
 390         operand_deliminator (info, dlx_jmp_opcode[idx].name);
 391         (*info->fprintf_func) (info->stream, "0x%08x", (int)imm26);
 392
 393         return (unsigned char) IJ_TYPE;
 394       }
 395
 396   return (unsigned char) NIL;
 397 }
 398
 399 /* Process the jump register instruction.  */
 400
 401 static unsigned char
 402 dlx_jr_type (struct disassemble_info* info)
 403 {
 404   struct _jr_opcode
 405   {
 406     unsigned long opcode;
 407     char *name;
 408   }
 409   dlx_jr_opcode[] =
 410   {
 411     { OPC(JROP),   "jr"    },  /* Store byte.  */
 412     { OPC(JALROP), "jalr"  }   /* Store halfword.  */
 413   };
 414   int dlx_jr_opcode_num =
 415     (sizeof dlx_jr_opcode) / (sizeof dlx_jr_opcode[0]);
 416   int idx;
 417
 418   for (idx = 0 ; idx < dlx_jr_opcode_num; idx++)
 419     if (dlx_jr_opcode[idx].opcode == opc)
 420       {
 421         (*info->fprintf_func) (info->stream, "%s", dlx_jr_opcode[idx].name);
 422         operand_deliminator (info, dlx_jr_opcode[idx].name);
 423         (*info->fprintf_func) (info->stream, "r%d", (int)rs1);
 424         return (unsigned char) IJR_TYPE;
 425       }
 426
 427   return (unsigned char) NIL;
 428 }
 429
 430 typedef unsigned char (* dlx_insn) (struct disassemble_info *);
 431
 432 /* This is the main DLX insn handling routine.  */
 433
 434 int
 435 print_insn_dlx (bfd_vma memaddr, struct disassemble_info* info)
 436 {
 437   bfd_byte buffer[4];
 438   int insn_idx;
 439   unsigned long insn_word;
 440   dlx_insn dlx_insn_type[] =
 441   {
 442     dlx_r_type,
 443     dlx_load_type,
 444     dlx_store_type,
 445     dlx_aluI_type,
 446     dlx_br_type,
 447     dlx_jmp_type,
 448     dlx_jr_type,
 449     (dlx_insn) NULL
 450   };
 451   int dlx_insn_type_num = ((sizeof dlx_insn_type) / (sizeof (dlx_insn))) - 1;
 452   int status =
 453     (*info->read_memory_func) (memaddr, (bfd_byte *) &buffer[0], 4, info);
 454
 455   if (status != 0)
 456     {
 457       (*info->memory_error_func) (status, memaddr, info);
 458       return -1;
 459     }
 460
 461   /* Now decode the insn    */
 462   insn_word = bfd_getb32 (buffer);
 463   opc  = dlx_get_opcode (insn_word);
 464   rs1  = dlx_get_rs1 (insn_word);
 465   rs2  = dlx_get_rs2 (insn_word);
 466   rd   = dlx_get_rdR (insn_word);
 467   func = dlx_get_func (insn_word);
 468   imm16= dlx_get_imm16 (insn_word);
 469   imm26= dlx_get_imm26 (insn_word);
 470
 471 #if 0
 472   printf ("print_insn_big_dlx: opc = 0x%02x\n"
 473           "                    rs1 = 0x%02x\n"
 474           "                    rs2 = 0x%02x\n"
 475           "                    rd  = 0x%02x\n"
 476           "                  func  = 0x%08x\n"
 477           "                 imm16  = 0x%08x\n"
 478           "                 imm26  = 0x%08x\n",
 479           opc, rs1, rs2, rd, func, imm16, imm26);
 480 #endif
 481
 482   /* Scan through all the insn type and print the insn out.  */
 483   current_insn_addr = (unsigned long) memaddr;
 484
 485   for (insn_idx = 0; dlx_insn_type[insn_idx] != 0x0; insn_idx++)
 486     switch ((dlx_insn_type[insn_idx]) (info))
 487       {
 488         /* Found the correct opcode   */
 489       case R_TYPE:
 490       case ILD_TYPE:
 491       case IST_TYPE:
 492       case IAL_TYPE:
 493       case IBR_TYPE:
 494       case IJ_TYPE:
 495       case IJR_TYPE:
 496         return 4;
 497
 498         /* Wrong insn type check next one. */
 499       default:
 500       case NIL:
 501         continue;
 502
 503         /* All rest of the return code are not recongnized, treat it as error */
 504         /* we should never get here,  I hope! */
 505       case R_ERROR:
 506         return -1;
 507       }
 508
 509   if (insn_idx ==  dlx_insn_type_num)
 510     /* Well, does not recoganize this opcode.  */
 511     (*info->fprintf_func) (info->stream, "<%s>", "Unrecognized Opcode");
 512
 513   return 4;
 514 }