opcodes/microblaze-dis.c

   1 /* Disassemble Xilinx microblaze instructions.
   2
   3    Copyright 2009 Free Software Foundation, Inc.
   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
  23 #include "sysdep.h"
  24 #define STATIC_TABLE
  25 #define DEFINE_TABLE
  26
  27 #include "dis-asm.h"
  28 #include <strings.h>
  29 #include "microblaze-opc.h"
  30 #include "microblaze-dis.h"
  31
  32 #define get_field_rd(instr)        get_field (instr, RD_MASK, RD_LOW)
  33 #define get_field_r1(instr)        get_field (instr, RA_MASK, RA_LOW)
  34 #define get_field_r2(instr)        get_field (instr, RB_MASK, RB_LOW)
  35 #define get_int_field_imm(instr)   ((instr & IMM_MASK) >> IMM_LOW)
  36 #define get_int_field_r1(instr)    ((instr & RA_MASK) >> RA_LOW)
  37
  38
  39
  40 static char *
  41 get_field (long instr, long mask, unsigned short low)
  42 {
  43   char tmpstr[25];
  44
  45   sprintf (tmpstr, "%s%d", register_prefix, (int)((instr & mask) >> low));
  46   return (strdup (tmpstr));
  47 }
  48
  49 static char *
  50 get_field_imm (long instr)
  51 {
  52   char tmpstr[25];
  53
  54   sprintf (tmpstr, "%d", (short)((instr & IMM_MASK) >> IMM_LOW));
  55   return (strdup (tmpstr));
  56 }
  57
  58 static char *
  59 get_field_imm5 (long instr)
  60 {
  61   char tmpstr[25];
  62
  63   sprintf (tmpstr, "%d", (short)((instr & IMM5_MASK) >> IMM_LOW));
  64   return (strdup (tmpstr));
  65 }
  66
  67 static char *
  68 get_field_rfsl (long instr)
  69 {
  70   char tmpstr[25];
  71
  72   sprintf (tmpstr, "%s%d", fsl_register_prefix,
  73            (short)((instr & RFSL_MASK) >> IMM_LOW));
  74   return (strdup (tmpstr));
  75 }
  76
  77 static char *
  78 get_field_imm15 (long instr)
  79 {
  80   char tmpstr[25];
  81
  82   sprintf (tmpstr, "%d", (short)((instr & IMM15_MASK) >> IMM_LOW));
  83   return (strdup (tmpstr));
  84 }
  85
  86 static char *
  87 get_field_special (long instr, struct op_code_struct * op)
  88 {
  89   char tmpstr[25];
  90   char spr[6];
  91
  92   switch ((((instr & IMM_MASK) >> IMM_LOW) ^ op->immval_mask))
  93     {
  94     case REG_MSR_MASK :
  95       strcpy (spr, "msr");
  96       break;
  97     case REG_PC_MASK :
  98       strcpy (spr, "pc");
  99       break;
 100     case REG_EAR_MASK :
 101       strcpy (spr, "ear");
 102       break;
 103     case REG_ESR_MASK :
 104       strcpy (spr, "esr");
 105       break;
 106     case REG_FSR_MASK :
 107       strcpy (spr, "fsr");
 108       break;
 109     case REG_BTR_MASK :
 110       strcpy (spr, "btr");
 111       break;
 112     case REG_EDR_MASK :
 113       strcpy (spr, "edr");
 114       break;
 115     case REG_PID_MASK :
 116       strcpy (spr, "pid");
 117       break;
 118     case REG_ZPR_MASK :
 119       strcpy (spr, "zpr");
 120       break;
 121     case REG_TLBX_MASK :
 122       strcpy (spr, "tlbx");
 123       break;
 124     case REG_TLBLO_MASK :
 125       strcpy (spr, "tlblo");
 126       break;
 127     case REG_TLBHI_MASK :
 128       strcpy (spr, "tlbhi");
 129       break;
 130     case REG_TLBSX_MASK :
 131       strcpy (spr, "tlbsx");
 132       break;
 133     default :
 134       if (((((instr & IMM_MASK) >> IMM_LOW) ^ op->immval_mask) & 0xE000)
 135           == REG_PVR_MASK)
 136         {
 137           sprintf (tmpstr, "%spvr%d", register_prefix,
 138                    (unsigned short)(((instr & IMM_MASK) >> IMM_LOW)
 139                                     ^ op->immval_mask) ^ REG_PVR_MASK);
 140           return (strdup (tmpstr));
 141         }
 142       else
 143         strcpy (spr, "pc");
 144       break;
 145     }
 146
 147    sprintf (tmpstr, "%s%s", register_prefix, spr);
 148    return (strdup (tmpstr));
 149 }
 150
 151 static unsigned long
 152 read_insn_microblaze (bfd_vma memaddr,
 153                       struct disassemble_info *info,
 154                       struct op_code_struct **opr)
 155 {
 156   unsigned char       ibytes[4];
 157   int                 status;
 158   struct op_code_struct * op;
 159   unsigned long inst;
 160
 161   status = info->read_memory_func (memaddr, ibytes, 4, info);
 162
 163   if (status != 0)
 164     {
 165       info->memory_error_func (status, memaddr, info);
 166       return 0;
 167     }
 168
 169   if (info->endian == BFD_ENDIAN_BIG)
 170     inst = (ibytes[0] << 24) | (ibytes[1] << 16) | (ibytes[2] << 8) | ibytes[3];
 171   else if (info->endian == BFD_ENDIAN_LITTLE)
 172     inst = (ibytes[3] << 24) | (ibytes[2] << 16) | (ibytes[1] << 8) | ibytes[0];
 173   else
 174     abort ();
 175
 176   /* Just a linear search of the table.  */
 177   for (op = opcodes; op->name != 0; op ++)
 178     if (op->bit_sequence == (inst & op->opcode_mask))
 179       break;
 180
 181   *opr = op;
 182   return inst;
 183 }
 184
 185
 186 int
 187 print_insn_microblaze (bfd_vma memaddr, struct disassemble_info * info)
 188 {
 189   fprintf_ftype       print_func = info->fprintf_func;
 190   void *              stream = info->stream;
 191   unsigned long       inst, prev_inst;
 192   struct op_code_struct * op, *pop;
 193   int                 immval = 0;
 194   bfd_boolean         immfound = FALSE;
 195   static bfd_vma      prev_insn_addr = -1; /* Init the prev insn addr.  */
 196   static int          prev_insn_vma = -1;  /* Init the prev insn vma.  */
 197   int                 curr_insn_vma = info->buffer_vma;
 198
 199   info->bytes_per_chunk = 4;
 200
 201   inst = read_insn_microblaze (memaddr, info, &op);
 202   if (inst == 0)
 203     return -1;
 204
 205   if (prev_insn_vma == curr_insn_vma)
 206     {
 207       if (memaddr-(info->bytes_per_chunk) == prev_insn_addr)
 208         {
 209           prev_inst = read_insn_microblaze (prev_insn_addr, info, &pop);
 210           if (prev_inst == 0)
 211             return -1;
 212           if (pop->instr == imm)
 213             {
 214               immval = (get_int_field_imm (prev_inst) << 16) & 0xffff0000;
 215               immfound = TRUE;
 216             }
 217           else
 218             {
 219               immval = 0;
 220               immfound = FALSE;
 221             }
 222         }
 223     }
 224
 225   /* Make curr insn as prev insn.  */
 226   prev_insn_addr = memaddr;
 227   prev_insn_vma = curr_insn_vma;
 228
 229   if (op->name == NULL)
 230     print_func (stream, ".short 0x%04x", inst);
 231   else
 232     {
 233       print_func (stream, "%s", op->name);
 234
 235       switch (op->inst_type)
 236         {
 237         case INST_TYPE_RD_R1_R2:
 238           print_func (stream, "\t%s, %s, %s", get_field_rd (inst),
 239                    get_field_r1(inst), get_field_r2 (inst));
 240           break;
 241         case INST_TYPE_RD_R1_IMM:
 242           print_func (stream, "\t%s, %s, %s", get_field_rd (inst),
 243                    get_field_r1(inst), get_field_imm (inst));
 244           if (info->print_address_func && get_int_field_r1 (inst) == 0
 245               && info->symbol_at_address_func)
 246             {
 247               if (immfound)
 248                 immval |= (get_int_field_imm (inst) & 0x0000ffff);
 249               else
 250                 {
 251                   immval = get_int_field_imm (inst);
 252                   if (immval & 0x8000)
 253                     immval |= 0xFFFF0000;
 254                 }
 255               if (immval > 0 && info->symbol_at_address_func (immval, info))
 256                 {
 257                   print_func (stream, "\t// ");
 258                   info->print_address_func (immval, info);
 259                 }
 260             }
 261           break;
 262         case INST_TYPE_RD_R1_IMM5:
 263           print_func (stream, "\t%s, %s, %s", get_field_rd (inst),
 264                    get_field_r1(inst), get_field_imm5 (inst));
 265           break;
 266         case INST_TYPE_RD_RFSL:
 267           print_func (stream, "\t%s, %s", get_field_rd (inst), get_field_rfsl (inst));
 268           break;
 269         case INST_TYPE_R1_RFSL:
 270           print_func (stream, "\t%s, %s", get_field_r1 (inst), get_field_rfsl (inst));
 271           break;
 272         case INST_TYPE_RD_SPECIAL:
 273           print_func (stream, "\t%s, %s", get_field_rd (inst),
 274                    get_field_special (inst, op));
 275           break;
 276         case INST_TYPE_SPECIAL_R1:
 277           print_func (stream, "\t%s, %s", get_field_special (inst, op),
 278                    get_field_r1(inst));
 279           break;
 280         case INST_TYPE_RD_R1:
 281           print_func (stream, "\t%s, %s", get_field_rd (inst), get_field_r1 (inst));
 282           break;
 283         case INST_TYPE_R1_R2:
 284           print_func (stream, "\t%s, %s", get_field_r1 (inst), get_field_r2 (inst));
 285           break;
 286         case INST_TYPE_R1_IMM:
 287           print_func (stream, "\t%s, %s", get_field_r1 (inst), get_field_imm (inst));
 288           /* The non-pc relative instructions are returns, which shouldn't
 289              have a label printed.  */
 290           if (info->print_address_func && op->inst_offset_type == INST_PC_OFFSET
 291               && info->symbol_at_address_func)
 292             {
 293               if (immfound)
 294                 immval |= (get_int_field_imm (inst) & 0x0000ffff);
 295               else
 296                 {
 297                   immval = get_int_field_imm (inst);
 298                   if (immval & 0x8000)
 299                     immval |= 0xFFFF0000;
 300                 }
 301               immval += memaddr;
 302               if (immval > 0 && info->symbol_at_address_func (immval, info))
 303                 {
 304                   print_func (stream, "\t// ");
 305                   info->print_address_func (immval, info);
 306                 }
 307               else
 308                 {
 309                   print_func (stream, "\t\t// ");
 310                   print_func (stream, "%x", immval);
 311                 }
 312             }
 313           break;
 314         case INST_TYPE_RD_IMM:
 315           print_func (stream, "\t%s, %s", get_field_rd (inst), get_field_imm (inst));
 316           if (info->print_address_func && info->symbol_at_address_func)
 317             {
 318             if (immfound)
 319               immval |= (get_int_field_imm (inst) & 0x0000ffff);
 320             else
 321               {
 322                 immval = get_int_field_imm (inst);
 323                 if (immval & 0x8000)
 324                   immval |= 0xFFFF0000;
 325               }
 326             if (op->inst_offset_type == INST_PC_OFFSET)
 327               immval += (int) memaddr;
 328             if (info->symbol_at_address_func (immval, info))
 329               {
 330                 print_func (stream, "\t// ");
 331                 info->print_address_func (immval, info);
 332               }
 333             }
 334           break;
 335         case INST_TYPE_IMM:
 336           print_func (stream, "\t%s", get_field_imm (inst));
 337           if (info->print_address_func && info->symbol_at_address_func
 338               && op->instr != imm)
 339             {
 340               if (immfound)
 341                 immval |= (get_int_field_imm (inst) & 0x0000ffff);
 342               else
 343                 {
 344                   immval = get_int_field_imm (inst);
 345                   if (immval & 0x8000)
 346                     immval |= 0xFFFF0000;
 347                 }
 348               if (op->inst_offset_type == INST_PC_OFFSET)
 349                 immval += (int) memaddr;
 350               if (immval > 0 && info->symbol_at_address_func (immval, info))
 351                 {
 352                   print_func (stream, "\t// ");
 353                   info->print_address_func (immval, info);
 354                 }
 355               else if (op->inst_offset_type == INST_PC_OFFSET)
 356                 {
 357                   print_func (stream, "\t\t// ");
 358                   print_func (stream, "%x", immval);
 359                 }
 360             }
 361           break;
 362         case INST_TYPE_RD_R2:
 363           print_func (stream, "\t%s, %s", get_field_rd (inst), get_field_r2 (inst));
 364           break;
 365         case INST_TYPE_R2:
 366           print_func (stream, "\t%s", get_field_r2 (inst));
 367           break;
 368         case INST_TYPE_R1:
 369           print_func (stream, "\t%s", get_field_r1 (inst));
 370           break;
 371         case INST_TYPE_RD_R1_SPECIAL:
 372           print_func (stream, "\t%s, %s", get_field_rd (inst), get_field_r2 (inst));
 373           break;
 374         case INST_TYPE_RD_IMM15:
 375           print_func (stream, "\t%s, %s", get_field_rd (inst), get_field_imm15 (inst));
 376           break;
 377         /* For tuqula instruction */
 378         case INST_TYPE_RD:
 379           print_func (stream, "\t%s", get_field_rd (inst));
 380           break;
 381         case INST_TYPE_RFSL:
 382           print_func (stream, "\t%s", get_field_rfsl (inst));
 383           break;
 384         default:
 385           /* If the disassembler lags the instruction set.  */
 386           print_func (stream, "\tundecoded operands, inst is 0x%04x", inst);
 387           break;
 388         }
 389     }
 390
 391   /* Say how many bytes we consumed.  */
 392   return 4;
 393 }
 394
 395 enum microblaze_instr
 396 get_insn_microblaze (long inst,
 397                      bfd_boolean *isunsignedimm,
 398                      enum microblaze_instr_type *insn_type,
 399                      short *delay_slots)
 400 {
 401   struct op_code_struct * op;
 402   *isunsignedimm = FALSE;
 403
 404   /* Just a linear search of the table.  */
 405   for (op = opcodes; op->name != 0; op ++)
 406     if (op->bit_sequence == (inst & op->opcode_mask))
 407       break;
 408
 409   if (op->name == 0)
 410     return invalid_inst;
 411   else
 412     {
 413       *isunsignedimm = (op->inst_type == INST_TYPE_RD_R1_UNSIGNED_IMM);
 414       *insn_type = op->instr_type;
 415       *delay_slots = op->delay_slots;
 416       return op->instr;
 417     }
 418 }
 419
 420 enum microblaze_instr
 421 microblaze_decode_insn (long insn, int *rd, int *ra, int *rb, int *immed)
 422 {
 423   enum microblaze_instr op;
 424   bfd_boolean t1;
 425   enum microblaze_instr_type t2;
 426   short t3;
 427
 428   op = get_insn_microblaze (insn, &t1, &t2, &t3);
 429   *rd = (insn & RD_MASK) >> RD_LOW;
 430   *ra = (insn & RA_MASK) >> RA_LOW;
 431   *rb = (insn & RB_MASK) >> RB_LOW;
 432   t3 = (insn & IMM_MASK) >> IMM_LOW;
 433   *immed = (int) t3;
 434   return (op);
 435 }
 436
 437 unsigned long
 438 microblaze_get_target_address (long inst, bfd_boolean immfound, int immval,
 439                                long pcval, long r1val, long r2val,
 440                                bfd_boolean *targetvalid,
 441                                bfd_boolean *unconditionalbranch)
 442 {
 443   struct op_code_struct * op;
 444   long targetaddr = 0;
 445
 446   *unconditionalbranch = FALSE;
 447   /* Just a linear search of the table.  */
 448   for (op = opcodes; op->name != 0; op ++)
 449     if (op->bit_sequence == (inst & op->opcode_mask))
 450       break;
 451
 452   if (op->name == 0)
 453     {
 454       *targetvalid = FALSE;
 455     }
 456   else if (op->instr_type == branch_inst)
 457     {
 458       switch (op->inst_type)
 459         {
 460         case INST_TYPE_R2:
 461           *unconditionalbranch = TRUE;
 462         /* Fall through.  */
 463         case INST_TYPE_RD_R2:
 464         case INST_TYPE_R1_R2:
 465           targetaddr = r2val;
 466           *targetvalid = TRUE;
 467           if (op->inst_offset_type == INST_PC_OFFSET)
 468             targetaddr += pcval;
 469           break;
 470         case INST_TYPE_IMM:
 471           *unconditionalbranch = TRUE;
 472         /* Fall through.  */
 473         case INST_TYPE_RD_IMM:
 474         case INST_TYPE_R1_IMM:
 475           if (immfound)
 476             {
 477               targetaddr = (immval << 16) & 0xffff0000;
 478               targetaddr |= (get_int_field_imm (inst) & 0x0000ffff);
 479             }
 480           else
 481             {
 482               targetaddr = get_int_field_imm (inst);
 483               if (targetaddr & 0x8000)
 484                 targetaddr |= 0xFFFF0000;
 485             }
 486           if (op->inst_offset_type == INST_PC_OFFSET)
 487             targetaddr += pcval;
 488           *targetvalid = TRUE;
 489           break;
 490         default:
 491           *targetvalid = FALSE;
 492           break;
 493         }
 494     }
 495   else if (op->instr_type == return_inst)
 496     {
 497       if (immfound)
 498         {
 499           targetaddr = (immval << 16) & 0xffff0000;
 500           targetaddr |= (get_int_field_imm (inst) & 0x0000ffff);
 501         }
 502       else
 503         {
 504           targetaddr = get_int_field_imm (inst);
 505           if (targetaddr & 0x8000)
 506             targetaddr |= 0xFFFF0000;
 507         }
 508       targetaddr += r1val;
 509       *targetvalid = TRUE;
 510     }
 511   else
 512     *targetvalid = FALSE;
 513   return targetaddr;
 514 }