opcodes/d30v-dis.c

   1 /* Disassemble D30V instructions.
   2    Copyright (C) 1997, 1998 Free Software Foundation, Inc.
   3
   4 This program is free software; you can redistribute it and/or modify
   5 it under the terms of the GNU General Public License as published by
   6 the Free Software Foundation; either version 2 of the License, or
   7 (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program; if not, write to the Free Software
  16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 #include <stdio.h>
  19 #include "opcode/d30v.h"
  20 #include "dis-asm.h"
  21 #include "opintl.h"
  22
  23 #define PC_MASK 0xFFFFFFFF
  24
  25 static int lookup_opcode PARAMS (( struct d30v_insn *insn, long num, int is_long ));
  26 static void print_insn PARAMS (( struct disassemble_info *info, bfd_vma memaddr, long long num,
  27                                  struct d30v_insn *insn, int is_long, int show_ext ));
  28 static int extract_value PARAMS (( long long num, struct d30v_operand *oper, int is_long ));
  29
  30 int
  31 print_insn_d30v (memaddr, info)
  32      bfd_vma memaddr;
  33      struct disassemble_info *info;
  34 {
  35   int status, result;
  36   bfd_byte buffer[12];
  37   unsigned long in1,in2;
  38   struct d30v_insn insn;
  39   long long num;
  40
  41   insn.form = (struct d30v_format *)NULL;
  42
  43   info->bytes_per_line = 8;
  44   info->bytes_per_chunk = 4;
  45   info->display_endian = BFD_ENDIAN_BIG;
  46
  47   status = (*info->read_memory_func) (memaddr, buffer, 4, info);
  48   if (status != 0)
  49     {
  50       (*info->memory_error_func) (status, memaddr, info);
  51       return -1;
  52     }
  53   in1 = bfd_getb32 (buffer);
  54
  55   status = (*info->read_memory_func) (memaddr+4, buffer, 4, info);
  56   if (status != 0)
  57     {
  58       info->bytes_per_line = 8;
  59       if (!(result = lookup_opcode(&insn, in1, 0)))
  60         (*info->fprintf_func) (info->stream, ".long\t0x%x",in1);
  61       else
  62         print_insn(info, memaddr, (long long) in1, &insn, 0, result);
  63       return 4;
  64     }
  65   in2 = bfd_getb32 (buffer);
  66
  67   if (in1 & in2 & FM01)
  68     {
  69       /* LONG instruction */
  70       if (!(result = lookup_opcode(&insn, in1, 1)))
  71         {
  72           (*info->fprintf_func) (info->stream, ".long\t0x%x,0x%x",in1,in2);
  73           return 8;
  74         }
  75       num = (long long)in1 << 32 | in2;
  76       print_insn(info, memaddr, num, &insn, 1, result);
  77     }
  78   else
  79     {
  80       num = in1;
  81       if (!(result = lookup_opcode(&insn, in1, 0)))
  82         (*info->fprintf_func) (info->stream, ".long\t0x%x",in1);
  83       else
  84         print_insn(info, memaddr, num, &insn, 0, result);
  85
  86       switch ( ((in1>>31)<<1) | (in2>>31) )
  87         {
  88         case 0:
  89           (*info->fprintf_func) (info->stream, "\t||\t");
  90           break;
  91         case 1:
  92           (*info->fprintf_func) (info->stream, "\t->\t");
  93           break;
  94         case 2:
  95           (*info->fprintf_func) (info->stream, "\t<-\t");
  96         default:
  97           break;
  98         }
  99
 100       insn.form = (struct d30v_format *)NULL;
 101       num = in2;
 102       if (!(result = lookup_opcode(&insn, in2, 0)))
 103         (*info->fprintf_func) (info->stream, ".long\t0x%x",in2);
 104       else
 105         print_insn(info, memaddr, num, &insn, 0, result);
 106
 107     }
 108   return 8;
 109 }
 110
 111
 112 /* returns 0 if lookup fails */
 113 /* 1 if found and only one form */
 114 /* 2 if found and there are short and long forms */
 115 static int
 116 lookup_opcode (insn, num, is_long)
 117      struct d30v_insn *insn;
 118      long num;
 119      int is_long;
 120 {
 121   int i=0, index;
 122   struct d30v_format *f;
 123   struct d30v_opcode *op = (struct d30v_opcode *)d30v_opcode_table;
 124   int op1 = (num >> 25) & 0x7;
 125   int op2 = (num >> 20) & 0x1f;
 126   int mod = (num >> 18) & 0x3;
 127
 128   /* find the opcode */
 129   do {
 130     if ((op->op1 == op1) && (op->op2 == op2))
 131       break;
 132     op++;
 133   } while (op->name);
 134
 135   if (!op || !op->name)
 136     return 0;
 137
 138   while (op->op1 == op1 && op->op2 == op2)
 139     {
 140       /* scan through all the formats for the opcode  */
 141       index = op->format[i++];
 142       do
 143         {
 144           f = (struct d30v_format *)&d30v_format_table[index];
 145           while (f->form == index)
 146             {
 147               if ((!is_long || f->form >= LONG) && (f->modifier == mod))
 148                 {
 149                   insn->form = f;
 150                   break;
 151                 }
 152               f++;
 153             }
 154           if (insn->form)
 155             break;
 156         } while ((index = op->format[i++]) != 0);
 157       if (insn->form)
 158         break;
 159       op++;
 160       i=0;
 161     }
 162   if (insn->form == NULL)
 163     return 0;
 164
 165   insn->op = op;
 166   insn->ecc = (num >> 28) & 0x7;
 167   if (op->format[1])
 168     return 2;
 169   else
 170     return 1;
 171 }
 172
 173
 174 static void
 175 print_insn ( info, memaddr, num, insn, is_long, show_ext )
 176      struct disassemble_info *info;
 177      bfd_vma memaddr;
 178      long long num;
 179      struct d30v_insn *insn;
 180      int is_long;
 181      int show_ext;
 182 {
 183   int val, opnum, need_comma=0;
 184   struct d30v_operand *oper;
 185   int i, match, opind=0, need_paren=0, found_control=0;
 186
 187   (*info->fprintf_func) (info->stream, "%s",insn->op->name);
 188
 189   /* check for CMP or CMPU */
 190   if (d30v_operand_table[insn->form->operands[0]].flags & OPERAND_NAME)
 191     {
 192       opind++;
 193       val = extract_value(num,(struct d30v_operand *)&d30v_operand_table[insn->form->operands[0]],is_long);
 194       (*info->fprintf_func) (info->stream, "%s",d30v_cc_names[val]);
 195     }
 196
 197   /* add in ".s" or ".l" */
 198   if (show_ext == 2)
 199     {
 200       if (is_long)
 201         (*info->fprintf_func) (info->stream, ".l");
 202       else
 203         (*info->fprintf_func) (info->stream, ".s");
 204     }
 205
 206   if (insn->ecc)
 207     (*info->fprintf_func) (info->stream, "/%s",d30v_ecc_names[insn->ecc]);
 208
 209   (*info->fprintf_func) (info->stream, "\t");
 210
 211   while ((opnum = insn->form->operands[opind++]) != 0)
 212     {
 213       int bits;
 214       oper = (struct d30v_operand *)&d30v_operand_table[opnum];
 215       bits = oper->bits;
 216       if (oper->flags & OPERAND_SHIFT)
 217         bits += 3;
 218
 219       if (need_comma && oper->flags != OPERAND_PLUS && oper->flags != OPERAND_MINUS)
 220         {
 221           need_comma=0;
 222           (*info->fprintf_func) (info->stream, ", ");
 223         }
 224
 225       if (oper->flags == OPERAND_ATMINUS)
 226         {
 227           (*info->fprintf_func) (info->stream, "@-");
 228           continue;
 229         }
 230       if (oper->flags == OPERAND_MINUS)
 231         {
 232           (*info->fprintf_func) (info->stream, "-");
 233           continue;
 234         }
 235       if (oper->flags == OPERAND_PLUS)
 236         {
 237           (*info->fprintf_func) (info->stream, "+");
 238           continue;
 239         }
 240       if (oper->flags == OPERAND_ATSIGN)
 241         {
 242           (*info->fprintf_func) (info->stream, "@");
 243           continue;
 244         }
 245       if (oper->flags == OPERAND_ATPAR)
 246         {
 247           (*info->fprintf_func) (info->stream, "@(");
 248           need_paren = 1;
 249           continue;
 250         }
 251
 252       if (oper->flags == OPERAND_SPECIAL)
 253         continue;
 254
 255       val = extract_value(num, oper, is_long);
 256
 257       if (oper->flags & OPERAND_REG)
 258         {
 259           match = 0;
 260           if (oper->flags & OPERAND_CONTROL)
 261             {
 262               struct d30v_operand *oper3 =
 263                 (struct d30v_operand *)&d30v_operand_table[insn->form->operands[2]];
 264               int id = extract_value (num, oper3, is_long );
 265               found_control = 1;
 266               switch ( id )
 267                 {
 268                 case 0:
 269                   val |= OPERAND_CONTROL;
 270                   break;
 271                 case 1:
 272                 case 2:
 273                   val = OPERAND_CONTROL + MAX_CONTROL_REG + id;
 274                   break;
 275                 case 3:
 276                   val |= OPERAND_FLAG;
 277                   break;
 278                 default:
 279                   fprintf(stderr,"illegal id (%d)\n",id);
 280                 }
 281             }
 282           else if (oper->flags & OPERAND_ACC)
 283             val |= OPERAND_ACC;
 284           else if (oper->flags & OPERAND_FLAG)
 285             val |= OPERAND_FLAG;
 286           for (i=0;i<reg_name_cnt();i++)
 287             {
 288               if (val == pre_defined_registers[i].value)
 289                 {
 290                   if (pre_defined_registers[i].pname)
 291                     (*info->fprintf_func)
 292                       (info->stream, "%s",pre_defined_registers[i].pname);
 293                   else
 294                     (*info->fprintf_func)
 295                       (info->stream, "%s",pre_defined_registers[i].name);
 296                   match=1;
 297                   break;
 298                 }
 299             }
 300           if (match==0)
 301             {
 302               /* this would only get executed if a register was not in the
 303                  register table */
 304               (*info->fprintf_func)
 305                 (info->stream, _("<unknown register %d>"), val & 0x3F);
 306             }
 307         }
 308       else if (insn->op->reloc_flag == RELOC_PCREL ||
 309                (opind == 1 && (insn->form->form == SHORT_D2 || insn->form->form == LONG_D)))
 310         {
 311           long max;
 312           int neg=0;
 313           max = (1 << (bits - 1));
 314           if (val & max)
 315             {
 316               if (bits == 32)
 317                 val = -val;
 318               else
 319                 val = -val & ((1 << bits)-1);
 320               neg = 1;
 321             }
 322           if (opind == 1 && (insn->form->form == SHORT_D2 || insn->form->form == LONG_D))
 323             {
 324               (*info->fprintf_func) (info->stream, "%x",val);
 325             }
 326           else {
 327             if (neg)
 328               {
 329                 (*info->fprintf_func) (info->stream, "-%x\t(",val);
 330                 (*info->print_address_func) ((memaddr - val) & PC_MASK, info);
 331                 (*info->fprintf_func) (info->stream, ")");
 332               }
 333             else
 334               {
 335                 (*info->fprintf_func) (info->stream, "%x\t(",val);
 336                 (*info->print_address_func) ((memaddr + val) & PC_MASK, info);
 337                 (*info->fprintf_func) (info->stream, ")");
 338               }
 339           }
 340         }
 341       else if (insn->op->reloc_flag == RELOC_ABS)
 342         {
 343           (*info->print_address_func) (val, info);
 344         }
 345       else
 346         {
 347           if (oper->flags & OPERAND_SIGNED)
 348             {
 349               int max = (1 << (bits - 1));
 350               if (val & max)
 351                 {
 352                   val = -val;
 353                   if (bits < 32)
 354                     val &= ((1 << bits) - 1);
 355                   (*info->fprintf_func) (info->stream, "-");
 356                 }
 357             }
 358           (*info->fprintf_func) (info->stream, "0x%x",val);
 359         }
 360       /* if there is another operand, then write a comma and space */
 361       if (insn->form->operands[opind] && !(found_control && opind == 2))
 362         need_comma = 1;
 363     }
 364   if (need_paren)
 365     (*info->fprintf_func) (info->stream, ")");
 366 }
 367
 368
 369
 370 static int
 371 extract_value (num, oper, is_long)
 372      long long num;
 373      struct d30v_operand *oper;
 374      int is_long;
 375 {
 376   int val;
 377   int shift = 12 - oper->position;
 378   int mask = (0xFFFFFFFF >> (32 - oper->bits));
 379
 380   if (is_long)
 381     {
 382       if (oper->bits == 32)
 383         {
 384           /* piece together 32-bit constant */
 385           val = ((num & 0x3FFFF)
 386                  | ((num & 0xFF00000) >> 2)
 387                  | ((num & 0x3F00000000LL) >> 6));
 388         }
 389       else
 390         val = (num >> (32 + shift)) & mask;
 391     }
 392   else
 393     val = (num >> shift) & mask;
 394
 395   if (oper->flags & OPERAND_SHIFT)
 396     val <<= 3;
 397
 398   return val;
 399 }