opcodes/d30v-dis.c

   1 /* Disassemble D30V instructions.
   2    Copyright (C) 1997, 1998, 2000 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 "sysdep.h"
  20 #include "opcode/d30v.h"
  21 #include "dis-asm.h"
  22 #include "opintl.h"
  23
  24 #define PC_MASK 0xFFFFFFFF
  25
  26 static int lookup_opcode PARAMS (( struct d30v_insn *insn, long num, int is_long ));
  27 static void print_insn PARAMS (( struct disassemble_info *info, bfd_vma memaddr, long long num,
  28                                  struct d30v_insn *insn, int is_long, int show_ext ));
  29 static int extract_value PARAMS (( long long num, struct d30v_operand *oper, int is_long ));
  30
  31 int
  32 print_insn_d30v (memaddr, info)
  33      bfd_vma memaddr;
  34      struct disassemble_info *info;
  35 {
  36   int status, result;
  37   bfd_byte buffer[12];
  38   unsigned long in1,in2;
  39   struct d30v_insn insn;
  40   long long num;
  41
  42   insn.form = (struct d30v_format *)NULL;
  43
  44   info->bytes_per_line = 8;
  45   info->bytes_per_chunk = 4;
  46   info->display_endian = BFD_ENDIAN_BIG;
  47
  48   status = (*info->read_memory_func) (memaddr, buffer, 4, info);
  49   if (status != 0)
  50     {
  51       (*info->memory_error_func) (status, memaddr, info);
  52       return -1;
  53     }
  54   in1 = bfd_getb32 (buffer);
  55
  56   status = (*info->read_memory_func) (memaddr+4, buffer, 4, info);
  57   if (status != 0)
  58     {
  59       info->bytes_per_line = 8;
  60       if (!(result = lookup_opcode(&insn, in1, 0)))
  61         (*info->fprintf_func) (info->stream, ".long\t0x%x",in1);
  62       else
  63         print_insn(info, memaddr, (long long) in1, &insn, 0, result);
  64       return 4;
  65     }
  66   in2 = bfd_getb32 (buffer);
  67
  68   if (in1 & in2 & FM01)
  69     {
  70       /* LONG instruction */
  71       if (!(result = lookup_opcode(&insn, in1, 1)))
  72         {
  73           (*info->fprintf_func) (info->stream, ".long\t0x%x,0x%x",in1,in2);
  74           return 8;
  75         }
  76       num = (long long)in1 << 32 | in2;
  77       print_insn(info, memaddr, num, &insn, 1, result);
  78     }
  79   else
  80     {
  81       num = in1;
  82       if (!(result = lookup_opcode(&insn, in1, 0)))
  83         (*info->fprintf_func) (info->stream, ".long\t0x%x",in1);
  84       else
  85         print_insn(info, memaddr, num, &insn, 0, result);
  86
  87       switch ( ((in1>>31)<<1) | (in2>>31) )
  88         {
  89         case 0:
  90           (*info->fprintf_func) (info->stream, "\t||\t");
  91           break;
  92         case 1:
  93           (*info->fprintf_func) (info->stream, "\t->\t");
  94           break;
  95         case 2:
  96           (*info->fprintf_func) (info->stream, "\t<-\t");
  97         default:
  98           break;
  99         }
 100
 101       insn.form = (struct d30v_format *)NULL;
 102       num = in2;
 103       if (!(result = lookup_opcode(&insn, in2, 0)))
 104         (*info->fprintf_func) (info->stream, ".long\t0x%x",in2);
 105       else
 106         print_insn(info, memaddr, num, &insn, 0, result);
 107
 108     }
 109   return 8;
 110 }
 111
 112
 113 /* returns 0 if lookup fails */
 114 /* 1 if found and only one form */
 115 /* 2 if found and there are short and long forms */
 116 static int
 117 lookup_opcode (insn, num, is_long)
 118      struct d30v_insn *insn;
 119      long num;
 120      int is_long;
 121 {
 122   int i=0, index;
 123   struct d30v_format *f;
 124   struct d30v_opcode *op = (struct d30v_opcode *)d30v_opcode_table;
 125   int op1 = (num >> 25) & 0x7;
 126   int op2 = (num >> 20) & 0x1f;
 127   int mod = (num >> 18) & 0x3;
 128
 129   /* find the opcode */
 130   do {
 131     if ((op->op1 == op1) && (op->op2 == op2))
 132       break;
 133     op++;
 134   } while (op->name);
 135
 136   if (!op || !op->name)
 137     return 0;
 138
 139   while (op->op1 == op1 && op->op2 == op2)
 140     {
 141       /* scan through all the formats for the opcode  */
 142       index = op->format[i++];
 143       do
 144         {
 145           f = (struct d30v_format *)&d30v_format_table[index];
 146           while (f->form == index)
 147             {
 148               if ((!is_long || f->form >= LONG) && (f->modifier == mod))
 149                 {
 150                   insn->form = f;
 151                   break;
 152                 }
 153               f++;
 154             }
 155           if (insn->form)
 156             break;
 157         } while ((index = op->format[i++]) != 0);
 158       if (insn->form)
 159         break;
 160       op++;
 161       i=0;
 162     }
 163   if (insn->form == NULL)
 164     return 0;
 165
 166   insn->op = op;
 167   insn->ecc = (num >> 28) & 0x7;
 168   if (op->format[1])
 169     return 2;
 170   else
 171     return 1;
 172 }
 173
 174
 175 static void
 176 print_insn ( info, memaddr, num, insn, is_long, show_ext )
 177      struct disassemble_info *info;
 178      bfd_vma memaddr;
 179      long long num;
 180      struct d30v_insn *insn;
 181      int is_long;
 182      int show_ext;
 183 {
 184   int val, opnum, need_comma=0;
 185   struct d30v_operand *oper;
 186   int i, match, opind=0, need_paren=0, found_control=0;
 187
 188   (*info->fprintf_func) (info->stream, "%s",insn->op->name);
 189
 190   /* check for CMP or CMPU */
 191   if (d30v_operand_table[insn->form->operands[0]].flags & OPERAND_NAME)
 192     {
 193       opind++;
 194       val = extract_value(num,(struct d30v_operand *)&d30v_operand_table[insn->form->operands[0]],is_long);
 195       (*info->fprintf_func) (info->stream, "%s",d30v_cc_names[val]);
 196     }
 197
 198   /* add in ".s" or ".l" */
 199   if (show_ext == 2)
 200     {
 201       if (is_long)
 202         (*info->fprintf_func) (info->stream, ".l");
 203       else
 204         (*info->fprintf_func) (info->stream, ".s");
 205     }
 206
 207   if (insn->ecc)
 208     (*info->fprintf_func) (info->stream, "/%s",d30v_ecc_names[insn->ecc]);
 209
 210   (*info->fprintf_func) (info->stream, "\t");
 211
 212   while ((opnum = insn->form->operands[opind++]) != 0)
 213     {
 214       int bits;
 215       oper = (struct d30v_operand *)&d30v_operand_table[opnum];
 216       bits = oper->bits;
 217       if (oper->flags & OPERAND_SHIFT)
 218         bits += 3;
 219
 220       if (need_comma && oper->flags != OPERAND_PLUS && oper->flags != OPERAND_MINUS)
 221         {
 222           need_comma=0;
 223           (*info->fprintf_func) (info->stream, ", ");
 224         }
 225
 226       if (oper->flags == OPERAND_ATMINUS)
 227         {
 228           (*info->fprintf_func) (info->stream, "@-");
 229           continue;
 230         }
 231       if (oper->flags == OPERAND_MINUS)
 232         {
 233           (*info->fprintf_func) (info->stream, "-");
 234           continue;
 235         }
 236       if (oper->flags == OPERAND_PLUS)
 237         {
 238           (*info->fprintf_func) (info->stream, "+");
 239           continue;
 240         }
 241       if (oper->flags == OPERAND_ATSIGN)
 242         {
 243           (*info->fprintf_func) (info->stream, "@");
 244           continue;
 245         }
 246       if (oper->flags == OPERAND_ATPAR)
 247         {
 248           (*info->fprintf_func) (info->stream, "@(");
 249           need_paren = 1;
 250           continue;
 251         }
 252
 253       if (oper->flags == OPERAND_SPECIAL)
 254         continue;
 255
 256       val = extract_value(num, oper, is_long);
 257
 258       if (oper->flags & OPERAND_REG)
 259         {
 260           match = 0;
 261           if (oper->flags & OPERAND_CONTROL)
 262             {
 263               struct d30v_operand *oper3 =
 264                 (struct d30v_operand *)&d30v_operand_table[insn->form->operands[2]];
 265               int id = extract_value (num, oper3, is_long );
 266               found_control = 1;
 267               switch ( id )
 268                 {
 269                 case 0:
 270                   val |= OPERAND_CONTROL;
 271                   break;
 272                 case 1:
 273                 case 2:
 274                   val = OPERAND_CONTROL + MAX_CONTROL_REG + id;
 275                   break;
 276                 case 3:
 277                   val |= OPERAND_FLAG;
 278                   break;
 279                 default:
 280                   fprintf(stderr,"illegal id (%d)\n",id);
 281                 }
 282             }
 283           else if (oper->flags & OPERAND_ACC)
 284             val |= OPERAND_ACC;
 285           else if (oper->flags & OPERAND_FLAG)
 286             val |= OPERAND_FLAG;
 287           for (i=0;i<reg_name_cnt();i++)
 288             {
 289               if (val == pre_defined_registers[i].value)
 290                 {
 291                   if (pre_defined_registers[i].pname)
 292                     (*info->fprintf_func)
 293                       (info->stream, "%s",pre_defined_registers[i].pname);
 294                   else
 295                     (*info->fprintf_func)
 296                       (info->stream, "%s",pre_defined_registers[i].name);
 297                   match=1;
 298                   break;
 299                 }
 300             }
 301           if (match==0)
 302             {
 303               /* this would only get executed if a register was not in the
 304                  register table */
 305               (*info->fprintf_func)
 306                 (info->stream, _("<unknown register %d>"), val & 0x3F);
 307             }
 308         }
 309       /* repeati has a relocation, but its first argument is a plain
 310          immediate.  OTOH instructions like djsri have a pc-relative
 311          delay target, but a absolute jump target.  Therefore, a test
 312          of insn->op->reloc_flag is not specific enough; we must test
 313          if the actual operand we are handling now is pc-relative.  */
 314       else if (oper->flags & OPERAND_PCREL)
 315         {
 316           int neg = 0;
 317
 318           /* IMM6S3 is unsigned.  */
 319           if (oper->flags & OPERAND_SIGNED || bits == 32)
 320             {
 321               long max;
 322               max = (1 << (bits - 1));
 323               if (val & max)
 324                 {
 325                   if (bits == 32)
 326                     val = -val;
 327                   else
 328                     val = -val & ((1 << bits)-1);
 329                   neg = 1;
 330                 }
 331             }
 332           if (neg)
 333             {
 334               (*info->fprintf_func) (info->stream, "-%x\t(",val);
 335               (*info->print_address_func) ((memaddr - val) & PC_MASK, info);
 336               (*info->fprintf_func) (info->stream, ")");
 337             }
 338           else
 339             {
 340               (*info->fprintf_func) (info->stream, "%x\t(",val);
 341               (*info->print_address_func) ((memaddr + val) & PC_MASK, info);
 342               (*info->fprintf_func) (info->stream, ")");
 343             }
 344         }
 345       else if (insn->op->reloc_flag == RELOC_ABS)
 346         {
 347           (*info->print_address_func) (val, info);
 348         }
 349       else
 350         {
 351           if (oper->flags & OPERAND_SIGNED)
 352             {
 353               int max = (1 << (bits - 1));
 354               if (val & max)
 355                 {
 356                   val = -val;
 357                   if (bits < 32)
 358                     val &= ((1 << bits) - 1);
 359                   (*info->fprintf_func) (info->stream, "-");
 360                 }
 361             }
 362           (*info->fprintf_func) (info->stream, "0x%x",val);
 363         }
 364       /* if there is another operand, then write a comma and space */
 365       if (insn->form->operands[opind] && !(found_control && opind == 2))
 366         need_comma = 1;
 367     }
 368   if (need_paren)
 369     (*info->fprintf_func) (info->stream, ")");
 370 }
 371
 372
 373
 374 static int
 375 extract_value (num, oper, is_long)
 376      long long num;
 377      struct d30v_operand *oper;
 378      int is_long;
 379 {
 380   int val;
 381   int shift = 12 - oper->position;
 382   int mask = (0xFFFFFFFF >> (32 - oper->bits));
 383
 384   if (is_long)
 385     {
 386       if (oper->bits == 32)
 387         {
 388           /* piece together 32-bit constant */
 389           val = ((num & 0x3FFFF)
 390                  | ((num & 0xFF00000) >> 2)
 391                  | ((num & 0x3F00000000LL) >> 6));
 392         }
 393       else
 394         val = (num >> (32 + shift)) & mask;
 395     }
 396   else
 397     val = (num >> shift) & mask;
 398
 399   if (oper->flags & OPERAND_SHIFT)
 400     val <<= 3;
 401
 402   return val;
 403 }